ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Unbekannt

Urban Studies Research

Hindawi

Online:

2011 – 2017

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Verlag: Hindawi

Print ISSN: 2090-4185

Digitale ISSN: 2090-4193

Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie

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2

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Journal of Chaos

Hindawi

Online:

2013 –

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Verlag: Hindawi

Print ISSN: 2356-7228

Digitale ISSN: 2314-6605

Thema: Mathematik

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3

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ISRN Biomathematics

Hindawi

Online:

2012 – 2014

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Verlag: Hindawi

Digitale ISSN: 2090-7702

Thema: Biologie , Mathematik

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4

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Journal of Calculus of Variations

Hindawi

Online:

2013 – 2013

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Verlag: Hindawi

Print ISSN: 2356-7198

Digitale ISSN: 2314-6613

Thema: Mathematik

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5

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ISRN Renewable Energy

Hindawi | International Scholarly Research Network (ISRN)

Online:

2011 – 2014

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Verlag: Hindawi , International Scholarly Research Network (ISRN)

Print ISSN: 2090-7451

Digitale ISSN: 2090-746X

Thema: Energietechnik

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6

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Abstract and Applied Analysis (AAA)

Hindawi

Online:

1.1996 –

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Verlag: Hindawi

Print ISSN: 1085-3375

Digitale ISSN: 1687-0409

Thema: Mathematik

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7

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Advances in Decision Sciences

Hindawi

Online:

1.1997 –

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Verlag: Hindawi

Print ISSN: 1173-9126 , 2090-3359

Digitale ISSN: 1532-7612 , 2090-3367

Thema: Mathematik

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8

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Advances in Statistics

Hindawi

Online:

2014 – 2015

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Verlag: Hindawi

Print ISSN: 2356-6892

Digitale ISSN: 2314-8314

Thema: Mathematik

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9

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Advances in Mathematical Physics

Hindawi

Online:

2009 –

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Verlag: Hindawi

Print ISSN: 1687-9120

Digitale ISSN: 1687-9139

Thema: Mathematik , Physik

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10

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Chinese Journal of Mathematics

Hindawi

Online:

2013 – 2018

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Verlag: Hindawi

Digitale ISSN: 2314-8071

Thema: Mathematik

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11

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Conference Papers in Mathematics

Hindawi

Online:

2013 –

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Verlag: Hindawi

Print ISSN: 2314-5854

Digitale ISSN: 2314-4777

Thema: Mathematik

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12

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Complexity (2017-)

Hindawi

Online:

2017 –

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Verlag: Hindawi

Print ISSN: 1076-2787

Digitale ISSN: 1099-0526

Thema: Informatik , Mathematik

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13

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International Journal of Nuclear Energy

Hindawi

Online:

2013 –

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Verlag: Hindawi

Print ISSN: 2356-7066

Digitale ISSN: 2314-6060

Thema: Energietechnik

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14

Unbekannt

International Journal of Partial Differential Equations

Hindawi

Online:

2013 –

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Verlag: Hindawi

Digitale ISSN: 2314-6524

Thema: Mathematik

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15

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ISRN Computational Mathematics

Hindawi | International Scholarly Research Network

Online:

2012 – 2014

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Verlag: Hindawi , International Scholarly Research Network

Digitale ISSN: 2090-7842

Thema: Informatik , Mathematik

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16

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ISRN Discrete Mathematics

Hindawi | International Scholarly Research Network

Online:

2011 – 2014

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Verlag: Hindawi , International Scholarly Research Network

Digitale ISSN: 2090-7788

Thema: Mathematik

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17

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International Journal of Differential Equations (formerly: Differential Equations and Nonlinear Mechanics)

Hindawi | Project Euclid

Online:

2006 – (older than 5 years)

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Verlag: Hindawi , Project Euclid

Print ISSN: 1687-9643

Digitale ISSN: 1687-9651

Thema: Mathematik

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18

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ISRN Combinatorics

Hindawi

Online:

2013 – 2014

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Verlag: Hindawi

Digitale ISSN: 2090-8911

Thema: Mathematik

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19

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ISRN Electrochemistry

Hindawi

Online:

2013 – 2014

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Verlag: Hindawi

Digitale ISSN: 2314-5439

Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik , Energietechnik , Maschinenbau

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20

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ISRN Applied Mathematics

Hindawi

Online:

2011 – 2014

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Verlag: Hindawi

Print ISSN: 2090-5564

Digitale ISSN: 2090-5572

Thema: Mathematik

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21

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ISRN Mathematical Analysis

Hindawi

Online:

2011 – 2014

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Verlag: Hindawi

Print ISSN: 2090-4657

Digitale ISSN: 2090-4665

Thema: Mathematik

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22

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ISRN Operations Research

Hindawi

Online:

2013 – 2014

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Verlag: Hindawi

Digitale ISSN: 2314-6397

Thema: Mathematik , Wirtschaftswissenschaften

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23

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ISRN Power Engineering

Hindawi

Online:

2013 – 2014

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Verlag: Hindawi

Digitale ISSN: 2314-632X

Thema: Energietechnik

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24

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International Journal of Analysis

Hindawi

Online:

2013 –

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Verlag: Hindawi

Print ISSN: 2314-498X

Digitale ISSN: 2314-4998

Thema: Mathematik

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25

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International Journal of Computational Mathematics

Hindawi

Online:

2014 –

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Verlag: Hindawi

Print ISSN: 2356-797X

Digitale ISSN: 2314-856X

Thema: Mathematik

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26

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International Journal of Photoenergy

Hindawi

Online:

1.1999 –

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Verlag: Hindawi

Print ISSN: 1110-662X

Digitale ISSN: 1687-529X

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Energietechnik

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27

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International Journal of Stochastic Analysis (Formerly: Journal of Applied Mathematics and Stochastic Analysis. - Journal of Applied Mathematics and Simulation)

Hindawi

Online:

1(1).1987 –

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Vormals: Journal of Applied Mathematics and Stochastic Analysis; Journal of Applied Mathematics and Simulation (1987–2009)

Verlag: Hindawi

Print ISSN: 1048-9533 , 2090-3332

Digitale ISSN: 1687-2177 , 2090-3340

Thema: Mathematik

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28

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ISRN Environmental Chemistry

Hindawi

Online:

2013 – 2014

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Verlag: Hindawi

Digitale ISSN: 2314-6419

Thema: Chemie und Pharmazie , Energietechnik

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29

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ISRN Probability and Statistics

Hindawi

Online:

2012 – 2014

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Verlag: Hindawi

Digitale ISSN: 2090-472X

Thema: Mathematik

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30

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International Journal of Quality, Statistics, and Reliability

Hindawi

Online:

2008 – 2012

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Fortgesetzt als: Journal of Quality and Reliability Engineering (2013–2016)

Verlag: Hindawi

Print ISSN: 1687-7144

Digitale ISSN: 1687-7152

Thema: Mathematik

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31

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ISRN Algebra

Hindawi

Online:

2011 – 2014

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Verlag: Hindawi

Print ISSN: 2090-6285

Digitale ISSN: 2090-6293

Thema: Mathematik

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32

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Journal of Difference Equations

Hindawi

Online:

2014 –

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Verlag: Hindawi

Print ISSN: 2356-7856

Digitale ISSN: 2356-7848

Thema: Mathematik

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33

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Journal of Fuels

Hindawi

Online:

2014 – 2015

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Verlag: Hindawi

Print ISSN: 2356-7392

Digitale ISSN: 2314-601X

Thema: Energietechnik

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34

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Journal of Probability (2014-2015)

Hindawi

Online:

2014 – 2015

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Verlag: Hindawi

Print ISSN: 2356-7589

Digitale ISSN: 2314-8373

Thema: Mathematik

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35

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Journal of Probability and Statistics

Hindawi

Online:

1.2009 –

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Verlag: Hindawi

Print ISSN: 1687-952X

Digitale ISSN: 1687-9538

Thema: Mathematik

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36

Unbekannt

Journal of Waste Management

Hindawi

Online:

2013 –

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Verlag: Hindawi

Digitale ISSN: 2314-6052

Thema: Energietechnik

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37

Unbekannt

Journal of Discrete Mathematics

Hindawi

Online:

2013 –

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Verlag: Hindawi

Digitale ISSN: 2090-9845

Thema: Mathematik

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38

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Journal of Function Spaces

Hindawi

Online:

1(1).2003 –

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Verlag: Hindawi

Print ISSN: 0972-6802 , 2314-8896

Digitale ISSN: 1758-4965 , 2314-8888

Thema: Mathematik

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39

Unbekannt

Journal of Complex Analysis

Hindawi

Online:

2013 –

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Verlag: Hindawi

Print ISSN: 2314-4963

Digitale ISSN: 2314-4971

Thema: Mathematik

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40

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Journal of Quality and Reliability Engineering

Hindawi

Online:

2008 –

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Vormals: International Journal of Quality, Statistics, and Reliability (2008–2012)

Verlag: Hindawi

Print ISSN: 2314-8055

Digitale ISSN: 2314-8047

Thema: Mathematik , Technik allgemein

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41

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Journal of Energy

Hindawi

Online:

2013 –

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Verlag: Hindawi

Print ISSN: 2356-735X

Digitale ISSN: 2314-615X

Thema: Energietechnik

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42

Unbekannt

Journal of Operators

Hindawi

Online:

2013 – 2016

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Verlag: Hindawi

Print ISSN: 2314-5064

Digitale ISSN: 2314-5072

Thema: Mathematik

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43

Unbekannt

Journal of Renewable Energy

Hindawi

Online:

2013 –

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Verlag: Hindawi

Print ISSN: 2314-4386

Digitale ISSN: 2314-4394

Thema: Energietechnik

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44

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Discrete Dynamics in Nature and Society (DDNS)

Hindawi

Online:

1.1997 –

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Verlag: Hindawi

Print ISSN: 1026-0226

Digitale ISSN: 1607-887X

Thema: Mathematik

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45

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Advances in Numerical Analysis

Hindawi

Online:

2009 –

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Verlag: Hindawi

Print ISSN: 1687-9562

Digitale ISSN: 1687-9570

Thema: Mathematik

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46

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Advances in Operations Research

Hindawi

Online:

1.2009 –

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Verlag: Hindawi

Print ISSN: 1687-9147

Digitale ISSN: 1687-9155

Thema: Mathematik , Wirtschaftswissenschaften

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47

Unbekannt

International Journal of Engineering Mathematics

Hindawi

Online:

2013 –

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Verlag: Hindawi

Digitale ISSN: 2314-6109

Thema: Mathematik , Technik allgemein

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48

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International Journal of Combinatorics

Hindawi

Online:

2010 –

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Verlag: Hindawi

Print ISSN: 1687-9163

Digitale ISSN: 1687-9171

Thema: Mathematik

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49

Unbekannt

International Journal of Mathematics and Mathematical Sciences (IJMMS)

Hindawi

Online:

1.1978 –

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Verlag: Hindawi

Print ISSN: 0161-1712

Digitale ISSN: 1687-0425

Thema: Mathematik

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50

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ISRN Geometry

Hindawi

Online:

2011 – 2014

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Verlag: Hindawi

Print ISSN: 2090-6307

Digitale ISSN: 2090-6315

Thema: Mathematik

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51

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Science and Technology of Nuclear Installations

Hindawi

Online:

1.2007 –

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Verlag: Hindawi

Print ISSN: 1687-6075

Digitale ISSN: 1687-6083

Thema: Energietechnik

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52

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Shock and Vibration

Hindawi

Online:

1.1993 –

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Verlag: Hindawi

Print ISSN: 1070-9622

Digitale ISSN: 1875-9203

Thema: Mathematik

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53

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Research Letters in Ecology

Hindawi

Online:

1.2007 – 3.2009

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Fortgesetzt als: International Journal of Ecology (2009–)

Verlag: Hindawi

Print ISSN: 1687-6768

Digitale ISSN: 1687-6776

Thema: Biologie , Energietechnik

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54

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Journal of Applied Mathematics (JAM)

Hindawi

Online:

1.2001 –

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Verlag: Hindawi

Print ISSN: 1110-757X

Digitale ISSN: 1687-0042

Thema: Mathematik

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Journal of Mathematics

Hindawi

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2013 –

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Print ISSN: 2314-4629

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Thema: Mathematik

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Journal of Optimization

Hindawi

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2013 –

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Verlag: Hindawi

Print ISSN: 2356-752X

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Thema: Informatik , Mathematik , Wirtschaftswissenschaften

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Journal of Industrial Mathematics

Hindawi

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2013 – 2016

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Print ISSN: 2314-8853

Digitale ISSN: 2314-6117

Thema: Mathematik

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Journal of Numbers

Hindawi

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2014 –

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Print ISSN: 2356-7511

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Thema: Mathematik

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Journal of Combustion

Hindawi

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1.2008 –

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Print ISSN: 2090-1968

Digitale ISSN: 2090-1976

Thema: Energietechnik

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Journal of Powder Technology

Hindawi

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1(1).2013 –

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Print ISSN: 2090-7710

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Thema: Energietechnik

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Journal of Nonlinear Dynamics

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2013 –

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Print ISSN: 2356-7503

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Thema: Mathematik

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Journal of Wind Energy

Hindawi

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2013 – 2016

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Print ISSN: 2356-7732

Digitale ISSN: 2314-6249

Thema: Energietechnik

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Mathematical Problems in Engineering (MPE)

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1.1995 –

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Print ISSN: 1024-123X

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Thema: Mathematik , Technik allgemein

Akronym/Kurzwort: MPE

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Geometry

Hindawi

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2013 –

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Print ISSN: 2314-422X

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Thema: Mathematik

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Game Theory

Hindawi

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2013 – 2016

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Print ISSN: 2356-6930

Digitale ISSN: 2314-6559

Thema: Mathematik

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Communications about uncertainty in scientific climate-related findings: a qualitative systematic review (2020)

Kause, Astrid ; Bruine de Bruin, Wändi ; Domingos, Samuel ; [weitere]

Institute of Physics

In: Environmental Research Letters. 2020; Published 2020 Aug 25. doi: 10.1088/1748-9326/abb265. [early online release]

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Print ISSN: 1748-9318

Digitale ISSN: 1748-9326

Thema: Energietechnik

Publiziert von Institute of Physics

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Multi-year isoscapes of lake water balances across a dynamic northern freshwater delta (2020)

Remmer, Casey R ; Neary, Laura K ; Kay, Mitchell L ; [weitere]

Institute of Physics

In: Environmental Research Letters. 2020; 15(10): 104066. Published 2020 Oct 07. doi: 10.1088/1748-9326/abb267.

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Publikationsdatum: 2020-10-07

Print ISSN: 1748-9318

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Thema: Energietechnik

Publiziert von Institute of Physics

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Colored Petri Net-Based Verification and Improvement of Time-Sensitive Single-Unit Manufacturing for the Soil Preparation Instrument of Space Missions (2020)

Yung, Kai Leung ; Gao, Ming ; Liu, An ; [weitere]

Hindawi

In: Discrete Dynamics in Nature and Society. 2020; 2020: 1-18. Published 2020 Aug 25. doi: 10.1155/2020/2162869.

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Beschreibung: Various space missions, including the Russian and Chinese interplanetary exploration collaboration in 2011 and the Phobos-Grunt space project to be relaunched by the Chinese in 2025, carry a soil preparation system (SOPSYS), which is an instrument used for scientific experiments. The design and manufacture of this precision instrument require stringent manufacturing processes and workflow of the highest quality, with every process in the project carefully monitored and controlled. All processes should be completed within the deadline so that the space project can be launched at the scheduled time. The colored Petri net (CPN) modeling method can describe a variety of resource types and execution logic, and it can be formally verified. Based on these advantages, we clearly describe the complex structure of the SPOSYS unit production process. In addition, we use critical time and the 6 sigma system to evaluate the availability and reliability of workflows, and we use elimination and simplification (ECRS) methods and constraint theory to improve the manufacturing process of the SOPSYS unit. We further provide optimization theories, methods, and insights for workflow management in time-sensitive and independent manufacturing systems.

Print ISSN: 1026-0226

Digitale ISSN: 1607-887X

Thema: Mathematik

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Club Characteristic and the Proximity Effect of Travel Links between Cities in China (2020)

Chen, Mingxing ; Luo, Xinyue ; Hu, Maogui ; [weitere]

Hindawi

In: Complexity. 2020; 2020: 1-13. Published 2020 Aug 25. doi: 10.1155/2020/5786384.

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Beschreibung: With the increasingly close relations between cities in China, it is of great significance to explore the regular characteristics of the intercity connection. Through Tencent’s population migration heat and Baidu map big data, this paper analyzes the regular characteristics of the relations between complex cities based on such index as the rich node propensity index, preference level index, and relative heat index and also investigates the influence of geographical proximity factors on the external relations of different cities. The research has the following results. Firstly, the relations between cities have obvious club characteristics. The rich nodes tend to connect with the rich nodes, while the nonrich nodes tend to connect with the nonrich nodes. Secondly, the connection between cities has the effect of hierarchical proximity, and cities mainly establish spatial connections with cities of the same level and adjacent level. Thirdly, the relations between cities also have the effect of geographical proximity, and the degree of influence of geographical proximity in low-level cities is greater than that in high-level cities. Fourthly, the external connection mode of high-level cities is to establish close contact with high-level cities adjacent to the level, with strong attraction to low-level cities adjacent to the location at the same time. The low-level cities are closely related to the high-level cities adjacent to the location and other cities of geographical proximity or adjacent level. This study helps to further understand the complex characteristics and laws of intercity connections and urban networks.

Print ISSN: 1076-2787

Digitale ISSN: 1099-0526

Thema: Informatik , Mathematik

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Design of a Tuned Mass Damper Inerter (TMDI) Based on an Exhaustive Search Optimization for Structural Control of Buildings under Seismic Excitations (2020)

Lara-Valencia, Luis Augusto ; Farbiarz-Farbiarz, Yosef ; Valencia-González, Yamile

Hindawi

In: Shock and Vibration. 2020; 2020: 1-19. Published 2020 Aug 25. doi: 10.1155/2020/8875268.

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Beschreibung: A tuned mass damper inerter (TMDI) is a new class of passive control device based on the inclusion of an inerter mechanism into a conventional tuned mass damper (TMD). The inerter device provides inertial resisting forces to the controlled system, through relatively small masses, converting it in a mechanism with the potential to enhance the performance of passive energy dissipating systems. This work presents a study of an optimal TMDI design through an exhaustive search process. TMDI device design using the cited parameter selection methodology consists in the determination of the damper critical damping ratio, ζTMDI, and frequency ratio, υTMDI, which result in the minimum structural response of a multidegree of freedom structural system, considering predefined values for mass ratio (µ) and inertance ratio (β). The used optimization process examines all possible damping device design parameter combinations to select the set of values that results in the best device performance to reduce response parameters in a structure. Four different optimization processes are performed by independently minimizing four performance indices: J1 associated to the reduction of the structure’s maximum peak displacement, J2 calculates the minimal RMS value for the structure’s peak displacement, J3 seeks by the minimal peak interstorey drift, and JP determines the lowest value for a linear weighted combination of the abovementioned three indices. A numerical example is developed with the purpose of validating the proposed optimization procedure and to evaluate the benefits of using TMDI as controlling devices for structures under seismic excitation, by carrying out a comparative analysis to contrast the performance of the optimization alternatives developed, running up to 1968192 cases. The obtained results show that devices designed based on exhaustive search optimization produce peak displacement reductions of up to 35% and peak structure displacement RMS reductions of up to 30%.

Print ISSN: 1070-9622

Digitale ISSN: 1875-9203

Thema: Mathematik

Publiziert von Hindawi

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An Integrated Decoupling Device for Azimuth Control of a Balloon-Borne Gondola (2020)

Wang, Honghui ; Yu, Xiaojun ; Wu, Juan ; [weitere]

Hindawi

In: Mathematical Problems in Engineering. 2020; 2020: 1-10. Published 2020 Aug 25. doi: 10.1155/2020/6718273.

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Beschreibung: Controlling and maintaining the orientation of the balloon-borne gondola for high-altitude flight is a prerequisite for ensuring the pointing control of observation instruments. When the balloon-borne gondola is flying in the stratosphere of the atmosphere, the existing external interferences will be converted into the coupling moment to the azimuth control system. Meanwhile, those uncertain factors and the frictional nonlinearity of the control system will also cause a certain magnitude of coupling moment. The existence of such coupling moment largely impacts on the accuracy and stability of the orientation control for the angular momentum exchange devices of the balloon-borne gondola. To address such an issue, this paper proposes and implements a novel type of integrated decoupler device. With this decoupler adopted, the aziDmuth control system could sense the existence of coupling torque and azimuth fluctuations quickly and suppress the influences of external interference, uncertain factors, and system structure nonlinearity on the azimuth control effectively, thereby improving the control accuracy of the azimuth control system. Both simulations and experiments are conducted to verify the effectiveness of the proposed device. The results show that the integration of the decoupler and the controller of the azimuth control system provide the azimuth control of the balloon-borne gondola with high accuracy and stability. Such a decoupler device design has a broad potential and could not only be used for balloon-borne gondola control but also could be applied onto other control systems using angular momentum exchange devices as actuators.

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Thema: Mathematik , Technik allgemein

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Continuous Time Formulation and Lagrangian Relaxation Algorithm for the Gate Assignment Problem (2020)

Yuan, Yuan ; Yan, Ping ; Zhao, Liqiang

Hindawi

In: Mathematical Problems in Engineering. 2020; 2020: 1-11. Published 2020 Aug 25. doi: 10.1155/2020/5059817.

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Beschreibung: Gates are important operating facilities and resources in civil airports. It is a core task in the airport operation management to select reasonable gates for inbound and outbound flights. We present a continuous time formulation with second-order cone programming (SOCP) for the gate assignment problem which allocates flights to available gates to optimize both the transfer time of passengers and the robustness of the airport operations schedules. The problem is formulated as a mixed integer nonlinear program, and then, the quadratic objective that minimizes the walking distance of transferring passengers is linearized, and the objective that minimizes the variance of idle time at the gates is transformed to a second-order cone constraint with a linear objective function. Then, a Lagrangian relaxation algorithm is developed by exploiting the problem structure. Computational tests are carried out to illustrate the efficiency of the model and the algorithms. It is shown that the continuous time formulation is more efficient than the existing model, and the Lagrangian relaxation algorithm can obtain better solutions faster than a commercial solver.

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Thema: Mathematik , Technik allgemein

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Stability of a Discrete-Time Pathogen Infection Model with Adaptive Immune Response (2020)

Alshaikh, M. A. ; Elaiw, A. M.

Hindawi

In: Discrete Dynamics in Nature and Society. 2020; 2020: 1-26. Published 2020 Aug 25. doi: 10.1155/2020/1264175.

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Beschreibung: This paper studies the global stability of a discrete-time pathogen dynamic model with both cell-mediated and antibody immune responses. Both latently and actively infected cells are incorporated into the model. We discretize the continuous-time model by using the nonstandard finite difference (NSFD) method. We establish that NSFD preserves the nonnegativity and boundedness of the solutions of the model. We derive four threshold parameters which govern the existence and stability of the steady states. We establish by using the Lyapunov method, the global stability of the five steady states of the model. We illustrate our theoretical results by using numerical simulations.

Print ISSN: 1026-0226

Digitale ISSN: 1607-887X

Thema: Mathematik

Publiziert von Hindawi

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Transient Study on the HTR-PM with TINTE-vPower Coupling Code Package (2020)

Sun, Jun ; Sun, Ximing ; Zheng, Yanhua

Hindawi

In: Science and Technology of Nuclear Installations. 2020; 2020: 1-14. Published 2020 Aug 25. doi: 10.1155/2020/5090597.

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Beschreibung: The high-temperature gas-cooled reactor pebble-bed module (HTR-PM) nuclear power plant consists of two nuclear steam supply system modules, each of which drives the steam turbine by the superheated steam flow and is fed by the heated-up water flow. The shared steam/water system induces mutual effects on normal operation conditions and transients of the nuclear power plant, which is worthy of safety concerns and intensive study. In this paper, a coupling code package was developed with the TINTE and vPower codes to understand how the HTR-PM operated. The TINTE code was used to analyze the reactor core and primary circuit, while the vPower code simulated the steam/water flow in the conventional island. Two TINTE models were built and coupled to one vPower model through the data exchange in the steam generator models. Using this code package, two typical transients were simulated by decreasing the primary flow rate or introducing the negative reactivity of one module. Important parameters, including the reactor power, the fuel temperature, and the reactor inlet and outlet helium temperatures of two modules, had been studied. The calculation results preliminarily proved that this code package can be further used to evaluate working performance of the HTR-PM.

Print ISSN: 1687-6075

Digitale ISSN: 1687-6083

Thema: Energietechnik

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Strict Deformation Quantization via Geometric Quantization in the Bieliavsky Plane (2020)

Hurtado, P. ; Leones, A. ; Moreno, J. B.

Hindawi

In: Abstract and Applied Analysis. 2020; 2020: 1-7. Published 2020 Aug 25. doi: 10.1155/2020/6794709.

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Beschreibung: Using standard techniques from geometric quantization, we rederive the integral product of functions on ℝ2 (non-Euclidian) which was introduced by Pierre Bieliavsky as a contribution to the area of strict quantization. More specifically, by pairing the nontransverse real polarization on the pair groupoid ℝ2×ℝ¯2, we obtain the well-defined integral transform. Together with a convolution of functions, which is a natural deformation of the usual convolution of functions on the pair groupoid, this readily defines the Bieliavsky product on a subset of L2ℝ2.

Print ISSN: 1085-3375

Digitale ISSN: 1687-0409

Thema: Mathematik

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Domain Identification for Inverse Problem via Conformal Mapping and Fixed Point Methods in Two Dimensions (2020)

Ndiaye, Fagueye

Hindawi

In: Abstract and Applied Analysis. 2020; 2020: 1-12. Published 2020 Aug 25. doi: 10.1155/2020/1745656.

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Beschreibung: In this paper, we present a survey of the inverse eigenvalue problem for a Laplacian equation based on available Cauchy data on a known part Γ0 and a homogeneous Dirichlet condition on an unknown part Γ0 of the boundary of a bounded domain, Ω⊂ℝN. We consider variations in the eigenvalues and propose a conformal mapping tool to reconstruct a part of the boundary curve of the two-dimensional bounded domain based on the Cauchy data of a holomorphic function that maps the unit disk onto the unknown domain. The boundary values of this holomorphic function are obtained by solving a nonlocal differential Bessel equation. Then, the unknown boundary is obtained as the image of the boundary of the unit disk by solving an ill-posed Cauchy problem for holomorphic functions via a regularized power expansion. The Cauchy data were restricted to a nonvanishing function and to the normal derivatives without zeros. We prove the existence and uniqueness of the holomorphic function being considered and use the fixed-point method to numerically analyze the results of convergence. We’ll calculate the eigenvalues and compare the result with the shape obtained via minimization functional method, as developed in a previous study. Further, we’ll observe via simulations the shape of Γ and if it preserves its properties with varying the eigenvalues.

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Thema: Mathematik

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Certain Generating Relations Involving the Generalized Multi-Index Bessel–Maitland Function (2020)

Jain, Shilpi ; Nieto, Juan J. ; Singh, Gurmej ; [weitere]

Hindawi

In: Mathematical Problems in Engineering. 2020; 2020: 1-5. Published 2020 Aug 25. doi: 10.1155/2020/8596736.

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Publikationsdatum: 2020-08-25

Beschreibung: Generating relations involving the special functions have already proved their important role in mathematics and other fields of sciences. In this paper, we aim to provide some presumably new generating relations in connection with the generalized multi-index Bessel–Maitland function Jνjm,qλjm,γ.. The main results presented here, being very general, can yield a number of particular or equivalent identities, some of which are explicitly demonstrated.

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Thema: Mathematik , Technik allgemein

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A Game Mechanism of Individual Value Decision-Making Based on SVO Differences (2020)

Shi, Xu ; Qiu, Lu-yun ; Fang, Zhi-geng ; [weitere]

Hindawi

In: Complexity. 2020; 2020: 1-11. Published 2020 Aug 25. doi: 10.1155/2020/6530847.

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Publikationsdatum: 2020-08-25

Beschreibung: As the externalized carrier of intrinsic value, value decision-making is an important factor affecting the social value system. As an old Chinese saying goes, “A friend in need is a friend indeed,” crisis environment provides the background for the conflicts of multiple values, while individual social value orientation (SVO) determines the ranking of the value states. This paper defined the SVO types by means of Slider Measure method on the basis of environment description, constructed a decision-making game model in accordance with SVO differences, and finally analysed the mechanism of people’s decision-making. Taking the epidemic situation as the background, this paper conducted an empirical analysis with the sample of college students. The results showed that the most SVO types of college students were prosocial orientation, followed by individualistic orientation, altruistic orientation, and competitive orientation. In the crisis environment, individual SVO type and decision-making constituted a mapping relationship. There was an equilibrium point in the decision of prosocial orientation, and the dominant decision of altruistic orientation or individualistic orientation is relatively stable.

Print ISSN: 1076-2787

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Thema: Informatik , Mathematik

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Structure and Dynamic of Global Population Migration Network (2020)

Gou, Wensha ; Huang, Siyu ; Chen, Qinghua ; [weitere]

Hindawi

In: Complexity. 2020; 2020: 1-17. Published 2020 Aug 25. doi: 10.1155/2020/4359023.

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Beschreibung: People are the most important factors of economy and the primary carriers of social culture. Cross-border migration brings economic and cultural impacts to the origin and destination and is also a key to reflect the international relations of related countries. In fact, the migration relationships of countries are complex and multilateral, but most traditional migration models are bilateral. Network theories could provide a better description of global migration to show the structure and statistical characteristics more clearly. Based on the estimated migration data and disparity filter algorithm, the networks describing the global multilateral migration relationships have been extracted among 200 countries over fifty years. The results show that the global migration networks during 1960–2015 exhibit a clustering and disassortative feature, implying globalized and multipolarized changes of migration during these years. The networks were embed into a Poincaré disk, yielding a typical and hierarchical “core-periphery” structure, which is associated with angular density distribution, and has been used to describe the “multicentering” trend since 1990s. Analysis on correlation and evolution of communities indicates the stability of most communities, yet some structural changes still exist since 1990s, which reflect that the important historical events are contributable to regional and even global migration patterns.

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Thema: Informatik , Mathematik

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Electric Vehicle Routing Problems with Stochastic Demands and Dynamic Remedial Measures (2020)

Ge, Xianlong ; Zhu, Ziqiang ; Jin, Yuanzhi

Hindawi

In: Mathematical Problems in Engineering. 2020; 2020: 1-15. Published 2020 Aug 25. doi: 10.1155/2020/8795284.

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Beschreibung: With the rapid development of e-commerce, logistic enterprises must better predict customer demand to improve distribution efficiency, so as to deliver goods in advance, which makes logistics stochastic and dynamic. In order to deal with this challenge and respond to the concept of “green logistics,” an electric vehicle routing problem with stochastic demands (EVRPSD) and proactive remedial measures is investigated, and an EVRPSD model with probability constraints is established. At the same time, a hybrid heuristic algorithm, combining a saving method and an improved Tabu search algorithm, is proposed to solve the model. Moreover, two insertion strategies with the greedy algorithm for charging stations and dynamic nodes are introduced. Finally, a large number of experimental data show that the heuristic algorithm proposed in this paper is feasible and effective.

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Thema: Mathematik , Technik allgemein

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Sentence Embedding Based Semantic Clustering Approach for Discussion Thread Summarization (2020)

Khan, Atif ; Shah, Qaiser ; Uddin, M. Irfan ; [weitere]

Hindawi

In: Complexity. 2020; 2020: 1-11. Published 2020 Aug 25. doi: 10.1155/2020/4750871.

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Publikationsdatum: 2020-08-25

Beschreibung: Huge data on the web come from discussion forums, which contain millions of threads. Discussion threads are a valuable source of knowledge for Internet users, as they have information about numerous topics. The discussion thread related to single topic comprises a huge number of reply posts, which makes it hard for the forum users to scan all the replies and determine the most relevant replies in the thread. At the same time, it is also hard for the forum users to manually summarize the bulk of reply posts in order to get the gist of discussion thread. Thus, automatically extracting the most relevant replies from discussion thread and combining them to form a summary are a challenging task. With this motivation behind, this study has proposed a sentence embedding based clustering approach for discussion thread summarization. The proposed approach works in the following fashion: At first, word2vec model is employed to represent reply sentences in the discussion thread through sentence embeddings/sentence vectors. Next, K-medoid clustering algorithm is applied to group semantically similar reply sentences in order to reduce the overlapping reply sentences. Finally, different quality text features are utilized to rank the reply sentences in different clusters, and then the high-ranked reply sentences are picked out from all clusters to form the thread summary. Two standard forum datasets are used to assess the effectiveness of the suggested approach. Empirical results confirm that the proposed sentence based clustering approach performed superior in comparison to other summarization methods in the context of mean precision, recall, and F-measure.

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Thema: Informatik , Mathematik

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Numerical Analysis of Seismic Site Effects in Loess Region of Western China under Strong Earthquake Excitations (2020)

Chen, Tuo ; Wu, Zhijian ; Mu, Yanhu ; [weitere]

Hindawi

In: Shock and Vibration. 2020; 2020: 1-12. Published 2020 Aug 25. doi: 10.1155/2020/3918352.

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Publikationsdatum: 2020-08-25

Beschreibung: The Loess Plateau is one of the most tectonically and seismically active areas in the world. Observations from past strong earthquakes, particularly the Minxian–Zhangxian and Wenchuan earthquakes, have shown distinctive evidence of seismic site effects in the mountainous area of southeastern Gansu province. In this study, seismic damage in the loess areas of southeastern Gansu province induced by these earthquakes was investigated and briefly described. Different types of ground motion were selected, and the one-dimensional equivalent linear method was used for numerical analysis of the ground motion effects in the loess regions. Moreover, seismic response analysis of a typical loess tableland was conducted. The results showed that the seismic responses of a typical loess tableland under different seismic excitations have totally different dynamic characteristics. Moreover, the seismic damage in loess regions was more serious under far-field seismic excitation compared with near-field seismic excitation with the same peak acceleration. Through this study, the quantitative assessment of ground motion effects can be approximately estimated and the mechanism of site amplification effects on ground motion is further explained.

Print ISSN: 1070-9622

Digitale ISSN: 1875-9203

Thema: Mathematik

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Two-Player Location Game in a Closed-Loop Market with Quantity Competition (2020)

Chen, Xiaofeng ; Song, Qiankun ; Zhao, Zhenjiang

Hindawi

In: Complexity. 2020; 2020: 1-12. Published 2020 Aug 25. doi: 10.1155/2020/4325454.

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Publikationsdatum: 2020-08-25

Beschreibung: This paper considers the two-player location game in a closed-loop market with quantity competition. Based on the Cournot and Hotelling models, a circle model is established for a closed-loop market in which two players (firms) play a location game under quantity competition. Using a two-stage (location-then-quantity) pattern and backward induction method, the existence of subgame-perfect Nash equilibria is proved for the location game in the circle model with a minimum distance transportation cost function. In addition, sales strategies are proposed for the two players for every local market on the circle when the players are in the equilibrium positions. Finally, an algorithm for simulating the competitive dynamics of the closed-loop market is designed, and two numerical simulations are provided to substantiate the effectiveness of the obtained results.

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An Overview on Linear Unmixing of Hyperspectral Data (2020)

Wei, Jiaojiao ; Wang, Xiaofei

Hindawi

In: Mathematical Problems in Engineering. 2020; 2020: 1-12. Published 2020 Aug 25. doi: 10.1155/2020/3735403.

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Beschreibung: Hyperspectral remote sensing technology has a strong capability for ground object detection due to the low spatial resolution of hyperspectral imaging spectrometers. A single pixel that leads to a hyperspectral remote sensing image usually contains more than one feature coverage type, resulting in a mixed pixel. The existence of a mixed pixel affects the accuracy of the ground object identification and classification and hinders the application and development of hyperspectral technology. For the problem of unmixing of mixed pixels in hyperspectral images (HSIs), the linear mixing model can model the mixed pixels well. Through the collation of nearly five years of the literature, this paper introduces the development status and problems of linear unmixing models from four aspects: geometric method, nonnegative matrix factorization (NMF), Bayesian method, and sparse unmixing.

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Thema: Mathematik , Technik allgemein

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Conceptual Design of a 10 MW Multipurpose Research Reactor Using VVR-KN Fuel (2020)

Nguyen, Nhi-Dien ; Nguyen, Kien-Cuong ; Huynh, Ton-Nghiem ; [weitere]

Hindawi

In: Science and Technology of Nuclear Installations. 2020; 2020: 1-11. Published 2020 Aug 25. doi: 10.1155/2020/7972827.

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Beschreibung: The paper presents a conceptual design of a 10 MW multipurpose nuclear research reactor (MPRR) loaded with the low-enriched uranium (LEU) VVR-KN fuel type. Neutronics and burnup calculations have been performed using the REBUS-MCNP6 linkage system code and the ENDF/B-VII.0 data library. The core consists of 36 fuel assemblies: 27 standard fuel assemblies and 9 control fuel assemblies with the uranium density of 2.8 gU/cm3 and the 235U enrichment of 19.75 wt.%. The cycle length of the core is 86 effective full-power days with the excess reactivity of 9600 and 1039 pcm at the beginning of cycle and the end of cycle, respectively. The highest power rate and the highest discharged burnup of fuel assembly are 393.49 kW and 56.74% loss of 235U, respectively. Thermal hydraulics analysis has also been conducted using the PLTEMP4.2 code for evaluating the safety parameters at a steady state of the hottest channel. The maximum temperatures of coolant and fuel cladding are 66.0°C and 83.0°C, respectively. This value is lower than the design limit of 98°C for cladding temperature. Thermal fluxes at the vertical irradiation channels and the horizontal beam ports have been evaluated. The maximum thermal fluxes of 2.5 × 1014 and 8.9 ×1013 n·cm−2·s−1 are found at the neutron trap and the beryllium reflector, respectively.

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Thema: Energietechnik

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Robust Object Tracking via Reverse Low-Rank Sparse Learning and Fractional-Order Variation Regularization (2020)

Tian, Dan ; Zhang, Guoshan ; Zang, Shouyu

Hindawi

In: Mathematical Problems in Engineering. 2020; 2020: 1-10. Published 2020 Aug 25. doi: 10.1155/2020/8640724.

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Beschreibung: Object tracking based on low-rank sparse learning usually makes the drift phenomenon occur when the target faces severe occlusion and fast motion. In this paper, we propose a novel tracking algorithm via reverse low-rank sparse learning and fractional-order variation regularization. Firstly, we utilize convex low-rank constraint to force the appearance similarity of the candidate particles, so as to prune the irrelevant particles. Secondly, fractional-order variation is introduced to constrain the sparse coefficient difference in the bounded variation space, which allows the difference between consecutive frames to exist, so as to adapt object fast motion. Meanwhile, fractional-order regularization can restrain severe occlusion by considering more adjacent frames information. Thirdly, we employ an inverse sparse representation method to model the relationship between target candidates and target template, which can reduce the computation complexity for online tracking. Finally, an online updating scheme based on alternating iteration is proposed for tracking computation. Experiments on benchmark sequences show that our algorithm outperforms several state-of-the-art methods, especially exhibiting better adaptability for fast motion and severe occlusion.

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Thema: Mathematik , Technik allgemein

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Research on Discriminative Skeleton-Based Action Recognition in Spatiotemporal Fusion and Human-Robot Interaction (2020)

Zhong, Qiubo ; Zheng, Caiming ; Zhang, Haoxiang

Hindawi

In: Complexity. 2020; 2020: 1-10. Published 2020 Aug 25. doi: 10.1155/2020/8717942.

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Publikationsdatum: 2020-08-25

Beschreibung: A novel posture motion-based spatiotemporal fused graph convolutional network (PM-STGCN) is presented for skeleton-based action recognition. Existing methods on skeleton-based action recognition focus on independently calculating the joint information in single frame and motion information of joints between adjacent frames from the human body skeleton structure and then combine the classification results. However, that does not take into consideration of the complicated temporal and spatial relationship of the human body action sequence, so they are not very efficient in distinguishing similar actions. In this work, we enhance the ability of distinguishing similar actions by focusing on spatiotemporal fusion and adaptive feature extraction for high discrimination information. Firstly, the local posture motion-based attention (LPM-TAM) module is proposed for the purpose of suppressing the skeleton sequence data with a low amount of motion in the temporal domain, and the representation of motion posture features is concentrated. Besides, the local posture motion-based channel attention module (LPM-CAM) is introduced to make use of the strongly discriminative representation between different action classes of similarity. Finally, the posture motion-based spatiotemporal fusion (PM-STF) module is constructed which fuses the spatiotemporal skeleton data by filtering out the low-information sequence and enhances the posture motion features adaptively with high discrimination. Extensive experiments have been conducted, and the results demonstrate that the proposed model is superior to the commonly used action recognition methods. The designed human-robot interaction system based on action recognition has competitive performance compared with the speech interaction system.

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A Velocity-Combined Local Best Particle Swarm Optimization Algorithm for Nonlinear Equations (2020)

Lian, Zhigang ; Wang, Songhua ; Chen, Yangquan

Hindawi

In: Mathematical Problems in Engineering. 2020; 2020: 1-9. Published 2020 Aug 25. doi: 10.1155/2020/6284583.

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Publikationsdatum: 2020-08-25

Beschreibung: Many people use traditional methods such as quasi-Newton method and Gauss–Newton-based BFGS to solve nonlinear equations. In this paper, we present an improved particle swarm optimization algorithm to solve nonlinear equations. The novel algorithm introduces the historical and local optimum information of particles to update a particle’s velocity. Five sets of typical nonlinear equations are employed to test the quality and reliability of the novel algorithm search comparing with the PSO algorithm. Numerical results show that the proposed method is effective for the given test problems. The new algorithm can be used as a new tool to solve nonlinear equations, continuous function optimization, etc., and the combinatorial optimization problem. The global convergence of the given method is established.

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Thema: Mathematik , Technik allgemein

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Cascade Delayed Controller Design for a Class of Underactuated Systems (2020)

Ochoa-Ortega, G. ; Villafuerte-Segura, R. ; Luviano-Juárez, A. ; [weitere]

Hindawi

In: Complexity. 2020; 2020: 1-18. Published 2020 Aug 25. doi: 10.1155/2020/2160743.

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Publikationsdatum: 2020-08-25

Beschreibung: In this paper, a delayed control strategy for a class of nonlinear underactuated fourth-order systems is developed. The proposal is based on the implementation of the tangent linearization technique, differential flatness, and a study of the σ-stabilization of the characteristic equation of the closed-loop system. The tangent linearization technique allows obtaining a local controllability property for the analyzed class of systems. Also, it can reduce the complexity of the global control design, through the use of a cascade connection of two second-order controllers instead of designing a global controller of the fourth-order system. The stabilizing behavior of the delayed controller design is supported by the σ-stability criterion, which provides the controller parameter selection to reach the maximum exponential decay rate on the system response. To illustrate the efficiency of the theoretical results, the proposal is experimentally assessed in two cases of study: a flexible joint system and a pendubot.

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Study on Waste Type Identification Method Based on Bird Flock Neural Network (2020)

Li, Shifeng ; Chen, Liyu

Hindawi

In: Mathematical Problems in Engineering. 2020; 2020: 1-12. Published 2020 Aug 25. doi: 10.1155/2020/9214350.

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Publikationsdatum: 2020-08-25

Beschreibung: According to the waste type identification requirement in waste classification, a waste type identification method based on a bird flock neural network (BFNN) was proposed. The problem of obtaining the feature dataset of waste images was considered, and color histogram and texture feature extraction techniques were used. The local optimum problem of a typical backpropagation neural network (BPNN) was considered, and a bird flock optimization (BFO) algorithm was proposed. The accuracy problem of the typical BPNN was considered, and a new online weight adjustment method of neurons was proposed. The number of hidden layer neurons (nodes) of the typical BPNN was considered, and an online adjustment method was proposed. The experimental results show that the recyclables (paper, plastic, glass, and cloth) and nonrecyclables can effectively be identified by the waste type identification method based on the BFNN, and the recognition accuracy is 81% which meets actual needs.

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A review of estimating population exposure to sea-level rise and the relevance for migration (2020)

McMichael, Celia ; Dasgupta, Shouro ; Ayeb-Karlsson, Sonja ; [weitere]

Institute of Physics

In: Environmental Research Letters. 2020; Published 2020 Aug 28. doi: 10.1088/1748-9326/abb398. [early online release]

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Print ISSN: 1748-9318

Digitale ISSN: 1748-9326

Thema: Energietechnik

Publiziert von Institute of Physics

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Projected changes in seasonal precipitation extremes over the United States in CMIP6 simulations (2020)

Akinsanola, A A ; Kooperman, G J ; Reed, K A ; [weitere]

Institute of Physics

In: Environmental Research Letters. 2020; 15(10): 104078. Published 2020 Oct 09. doi: 10.1088/1748-9326/abb397.

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Publikationsdatum: 2020-10-09

Print ISSN: 1748-9318

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Thema: Energietechnik

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Multipopulation Genetic Algorithm Based on GPU for Solving TSP Problem (2020)

Wang, Boqun ; Zhang, Hailong ; Nie, Jun ; [weitere]

Hindawi

In: Mathematical Problems in Engineering. 2020; 2020: 1-8. Published 2020 Aug 28. doi: 10.1155/2020/1398595.

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Beschreibung: A GPU-based Multigroup Genetic Algorithm was proposed, which parallelized the traditional genetic algorithm with a coarse-grained architecture island model. The original population is divided into several subpopulations to simulate different living environments, thus increasing species richness. For each subpopulation, different mutation rates were adopted, and the crossover results were optimized by combining the crossover method based on distance. The adaptive mutation strategy based on the number of generations was adopted to prevent the algorithm from falling into the local optimal solution. An elite strategy was adopted for outstanding individuals to retain their superior genes. The algorithm was implemented with CUDA/C, combined with the powerful parallel computing capabilities of GPUs, which greatly improved the computing efficiency. It provided a new solution to the TSP problem.

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A New Separable Piecewise Linear Learning Algorithm for the Stochastic Empty Container Repositioning Problem (2020)

Zhou, Shaorui ; Zhuo, Xiaopo ; Chen, Zhiming ; [weitere]

Hindawi

In: Mathematical Problems in Engineering. 2020; 2020: 1-16. Published 2020 Aug 28. doi: 10.1155/2020/4762064.

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Beschreibung: A common challenge faced by liner operators in practice is to effectively allocate empty containers now in a way that minimizes the expectation of costs and reduces inefficiencies in the future with uncertainty. To incorporate uncertainties in the operational model, we formulate a two-stage stochastic programming model for the stochastic empty container repositioning (ECR) problem. This paper proposes a separable piecewise linear learning algorithm (SPELL) to approximate the expected cost function. The core of SPELL involves learning steps that provide information for updating the expected cost function adaptively through a sequence of piecewise linear separable approximations. Moreover, SPELL can utilize the network structure of the ECR problem and does not require any information about the distribution of the uncertain parameters. For the two-stage stochastic programs, we prove the convergence of SPELL. Computational results show that SPELL performs well in terms of operating costs. When the scale of the problem is very large and the dimensionality of the problem is increased, SPELL continues to provide consistent performance very efficiently and exhibits excellent convergence performance.

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Complex Dynamical Behaviors of a Mixed Duopoly Game Based on Intellectual Property Rights Protection (2020)

Chu, Tong ; Yu, Yu ; Wang, Xiaoxue

Hindawi

In: Complexity. 2020; 2020: 1-11. Published 2020 Aug 28. doi: 10.1155/2020/4601510.

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Beschreibung: Based on the oligopoly game theory and the intellectual property rights protection policy, we investigate the complex dynamical behaviors of a mixed duopoly game with quadratic cost. In the new system, a few parameters are improved by considering intellectual property rights protection and the stability conditions of the Nash equilibrium point are discussed in detail. A set of the two-dimensional bifurcation diagrams is demonstrated by using numerical modeling, and these diagrams show abundant complex dynamical behaviors, such as coexistence of attractors, different bifurcation, and fractal structures. These dynamical properties can present the long-run effects of strengthening intellectual property protection.

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Retracted: Examining Dent Formation Caused by Hailstone Impact (2020)

Hindawi

In: Shock and Vibration. 2020; 2020: 1-1. Published 2020 Aug 28. doi: 10.1155/2020/3018369.

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Print ISSN: 1070-9622

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Thema: Mathematik

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Review on Selection and Experiment Method of Commonly Studied Simulated Radionuclides in Researches of Nuclear Waste Solidification (2020)

Li, Jingwei ; Xu, Dong ; Wang, Wenlong ; [weitere]

Hindawi

In: Science and Technology of Nuclear Installations. 2020; 2020: 1-13. Published 2020 Aug 28. doi: 10.1155/2020/3287320.

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Beschreibung: Although many types of simulated radionuclides have been widely used as a substitute for actual nuclear waste in the studies of nuclear waste solidification, the understanding of the applicability and validity of simulated radionuclides is still insufficient. In particular, the selection and use of simulated radionuclides, which can play a decisive role in the accuracy of the experimental results, still lack unified or integrated references. This paper provides a critical review on the selection, experimental methods, and applicability of the most commonly studied simulated radionuclides, followed by a careful discussion and recommendation of simulated radionuclides suitable for different solidified bodies. The main factors (e.g., temperature, pH, and atmosphere) affecting the choice of simulated radionuclides were analyzed in detail. This work helps to integrate the selection and use of simulated radionuclides, and it will be beneficial for improving the effectiveness of nuclide solidification research.

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Thema: Energietechnik

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Study on Dynamic Constitutive Model of Weakly Consolidated Soft Rock in Western China (2020)

Wang, Lei ; Su, Hongming ; Qin, Yue ; [weitere]

Hindawi

In: Shock and Vibration. 2020; 2020: 1-13. Published 2020 Aug 28. doi: 10.1155/2020/8865013.

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Beschreibung: To obtain the impact mechanical response and establish the dynamic damage constitutive relationship of frozen sandstone at low temperature conditions, the impact test of Cretaceous red sandstone under different temperatures was conducted using a split Hopkinson pressure bar (SHPB) device. According to the characteristics of the stress-strain curves obtained by the test, a constitutive model considering the damage effect, temperature effect, and strain rate effect was established, which was improved by Zhu–Wang–Tang (Z–W–T) constitutive model. It was proved that the fitting curves of constitutive equation were in good agreement with the test curves. The fluctuation amplitude of fitting error was controlled within ±4 MPa. The physical meaning of each parameter of the constitutive model is clear, and most of them are fixed values. The selection range of variable parameters and the related change rules are confirmed, which improves the practicability of constitutive model. The constitutive equation can well describe the nonlinear features of this kind of frozen sandstone under impact loading. It was also found that the constitutive equation was applicable to express the dynamic mechanical properties of rock-like materials such as hard rock, soft rock, frozen soil, raw coal, and concrete. It can be referred to the parameter determination method in this paper to study and determine the parameters, reduce the difficulty of parameter selection, and improve the practicability of the constitutive model and parameters, so as to guide the engineering practice better.

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Existence of Solutions for the Discrete Dirichlet Problem Involving p-Mean Curvature Operator (2020)

Wang, Jianxia ; Zhou, Zhan

Hindawi

In: Discrete Dynamics in Nature and Society. 2020; 2020: 1-10. Published 2020 Aug 29. doi: 10.1155/2020/6591523.

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Publikationsdatum: 2020-08-29

Beschreibung: This work is to discuss the Dirichlet boundary value problem of the difference equation with p -mean curvature operator. Under some determinate growth conditions on the nonlinear term, the existence of one solution or two nontrivial solutions is obtained via variational methods and some analysis techniques. Examples are also given to illustrate our theorems in the last section.

Print ISSN: 1026-0226

Digitale ISSN: 1607-887X

Thema: Mathematik

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Finite-Time Terminal Sliding Mode Tracking Control of a VTOL UAV via the Generalized NDOB (2020)

Wang, Lu ; Cheng, Jianhua

Hindawi

In: Mathematical Problems in Engineering. 2020; 2020: 1-13. Published 2020 Aug 29. doi: 10.1155/2020/4651475.

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Beschreibung: In this paper, we propose a finite-time sliding mode trajectory tracking control methodology for the vertical takeoff and landing unmanned aerial vehicle (VTOL UAV). Firstly, a system error model of trajectory tracking task is established based on Rodrigues parameters by considering both external and internal uncertainties. According to the cascade property, the system model is divided into translational and rotational subsystems, and a hierarchical control structure is hence proposed. Then, a finite-time generalized nonlinear disturbance observer (NDOB) is proposed, based on which the finite-time convergence result of equivalent disturbance estimation can be acquired. Finally, by introducing a tan-type compensator into the traditional terminal sliding mode control (SMC), the finite-time convergence result of the closed-loop control system is acquired based on Lyapunov stability analysis. Simulation results show the effectiveness of the proposed methodology.

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