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  • 1
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    Customized meta-waveguide for phase and absorption (2021)
    Institute of Physics
    Details
    Publication Date: 2021-08-25
    Print ISSN: 0022-3727
    Electronic ISSN: 1361-6463
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    α-Effect in Menschutkin alkylations (1993)
    s.l. : American Chemical Society
    The @journal of organic chemistry 58 (1993), S. 7883-7890 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00079a038
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Uniaxial Oriented Poly(p-phenylene) Fibrils and Films (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 3678-3679 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00091a035
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  • 4
    Electronic Resource
    Electronic Resource
    Expression of ODF and ICAM-1 of Bone Marrow Mesenchymal Stem Cells is Enhanced with Osteogenic Differentiation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 1173-1176 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Osteoblasts were perceived as pivotal cells, recognized as the cells that control both the formativeand the resorptive phases of the bone remodeling cycle. Osteoblasts were an essential requirement forosteoclastogenesis though expressing or secreating bioactive osteoclast-differentiation-regulatory proteins,osteoclast differentiation factor (ODF)was the most important factor among these, ODF participate nearly inevery step of differentiation and activation of osteoclasts. In addition, intercellular adhesion molecule-1(ICAM-1)and its receptors LFA-1 play a role in osteoclast development by affecting adhesion betweenstromal cells and osteoclast progenitors before the occurrence of ODF-ODF receptor signaling. However, itis not clear about the relationship between ODF, ICAM-1 expression of osteoblasts and differentiation stateof osteoblasts. So,the aim of this study was to investgate whether the expression of ODF, ICAM-1 dependedon the stage of osteoblastic differentiation from rat bone marrow mesenchymal stem cells(rBMSCs). Theviability of rBMSCs is reduced significantly by osteogenic inducement as differentiating into osteoblasts,ALPase activity of OS-treated rBMSCs was enhanced obviously within 9 days , declined subsequently andrecovered nearly the original level at day 14. Expression of ODF is enhanced with osteogenic differentiationguadully. whereas, expression of ICAM-1 is activated at OS-treated day 6, then keeping at a stable level.This study indicated that rBMSCs undergoing osteogenic inducement was an ideal model for studying thedifferentiation and maturation of osteoblasts. During the early stage of differentiation along osteoblasts fromstem cells to osteocytes, rBMSCs or Osteoprogenitor react somewhat differently from osteoblasts,suggesting the ability of osteoblasts to regulating differentiation and maturation of osteoclasts have beenimproved with osteogenic culture
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.1173.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of Mechanical Strain on Osteoblastic Precursor Cells in a Three-Dimensional Scaffold (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1181-1184 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: It was well recognized that mechanical strain plays a crucial role in periodontal tissuesremodeling. The aim of this study was to investigate the effect of mechanical strain on osteoblasticprecursor cells in a collagen type I gel scaffold. Rat MSCs were isolated and cultured according tothe established method. Cells were induced with osteogenic medium, then seeded in a collagen typeI gel and mechanically stretched by application of cyclic biaxial strain 24h later. Strain cycle was setto 1 cycle/min (0.017Hz), and strain magnitude was set to 2%, 5%, 7% elongation. Cells werecollected in 0h, 3h, 6h, 9h, 12h, 24h and 48h respectively. ODF and ICAM-1 mRNA were analyzedby RT-PCR assay. The results shown that 2-7% elongation strain, either dynamic or static, inhibitedICAM-1and ODF expression of osteoblastic precursors, and the effects were relative tightly to strainmagnitude. The inhibition effects of dynamic strain loading group exceeded the corresponding staticstrain. This work suggested that appropriate mechanical strech may suppress differentiation ofosteoclasts through inhibiting expression of ICAM-1 and ODF. Application of mechanical stressmight have a beneficial effect on quantity of generated bone tissue and might be a important factorin tissue engineering of periodontal tissues
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1181.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical Modeling of Low Frequency Electromagnetic Casting of 7XXX Aluminum Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 707-712 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Low frequency electromagnetic casting is a new developed technology that appears in therecent years. In this paper, a comprehensive mathematical model has been developed to describe theinteraction of the multiple physics fields during LFEC (low frequency electromagnetic casting)process. The model is based on a combination of the commercial finite element package ANSYS andthe commercial finite volume package FLUENT, with the former for calculation of theelectromagnetic field and the latter for calculation of the magnetic driven fluid flow, heat transfer andsolidification. Moreover, the model has been verified against the temperature measurements obtainedfrom one 7XXX aluminum alloy billet of 200mm in diameter, during the LFEC casting processes,respectively. There was a good agreement between the calculated results and the measured results.Further, the effects of electromagnetic frequency on fluid flow, temperature field and solidificationduring LFEC process have investigated numerically by using the mathematic model. The choosingcriterion of the electromagnetic frequency during LFEC process has been used in order to obtain thebest structure of the billets by analyzing the effects of fluid flow and temperature field on thesolidification process in the presence of electromagnetic field
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.707.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    The Influence of Surveying Method on Mechanical-Electrical Properties of Smart Mortar (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 1343-1347 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: To a certain mortar, the identical measuring means can results in quite difference .Throughdetermination intelligence concrete mortars mechanical –electrical with direct current ,alternatingcircuit,direct bridge and alternating electric bridge,the authors points out the outcomes stabilityfrom direct current and direct bridge get worse because they can´t dispel polarization existed inmortar itself. On the contrarory , both alternating circuit and alternating electric bridge can . At thesame time, The authors discussed the influence on impedance (Z) of difference equivalent andfrequency, and found that the using of series connection and high frequency sine wave can releasedimpedance Z in this materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.1343.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Coupled Modeling of Electromagnetic Field, Fluid Flow, Heat Transfer and Solidification during Conventional DC Casting and Low Frequency Electromagnetic Casting of 7XXX Aluminum Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 18-23 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A comprehensive mathematical model has been developed to describe the interaction ofthe multiple physics fields during the conventional DC casting and LFEC (low frequencyelectromagnetic casting) process. The model is based on a combination of the commercial finiteelement package ANSYS and the commercial finite volume package FLUENT, with the former forthe calculation of the electromagnetic field and the latter for the calculation of the magnetic drivenfluid flow, heat transfer and solidification. Moreover, the model has been verified against thetemperature measurements obtained from two 7XXX aluminum alloy billets of 200mm diameter,cast during the conventional DC casting and the LFEC casting processes. In addition, ameasurement of the sump shape of the billets were carried out by using addition melting metal ofAl-30%Cu alloy into the billets during casting process. There was a good agreement between thecalculated results and the measured results. Further, comparison of the calculated results during theLFEC process with that during the conventional DC casting process indicated that velocity patterns,temperature profiles and the sump depth are strongly modified by the application of a lowfrequency electromagnetic field during the DC casting
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.18.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Proliferation Effect of Mandibular Condylar Chondrocytes Given The Static Tension-Stress and/or TGF-β1 In Vitro (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1125-1128 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The purpose of this study is to study the proliferous effect of mandibular condylarchondrocytes given static tension-stress and/or transforming growth factor-β1 (TGF-β1) in vitro. Thefourth-passage condylar chondrocytes were harvested for this study, and a pulsatile cellularmechanical system was used to apply stress on cells. The proliferous effect of condylarchondrocytes given continuous static tension-stress and/or TGF-β1 were examined by using flowcytometry. The experiment was divided into two parts. The first part was divided into 20 groupsaccording to different TGF-β1 dosage (0ng/ml, 0.1ng/ml, 1ng/ml and 10ng/ml) for 0, 6, 12, 18 and24 hours respectively. The second part was divided into eight groups under continuous statictension-stress (0 or 5kPa) and different TGF-β1 dosage (0ng/ml, 0.1ng/ml, 1ng/ml, 10ng/ml) for 12hours. Experimental data was analyzed with repeated interclass analysis of variance The resultsshowed that chondrocytes which were cultured under different TGF-β1dose combined with 5kPastatic tension-stress had multi-horn morphological characters, including a great quantity ofchondrocytes with division growth.TGF-β1 had a mitogenic effect on rat mandibular condylechondrocytes at the concentrations of 0.1 , 1 and 10ng/ml , and the mitogenic effect of TGF-β1 tocondylar chondrocytes were demonstrated after 12 to 18 hours, and the peak of mitogenic effectsappeared at the 18th hour (P 〈0.05) . The most active mitogenesis happened in the group whosechondrocytes was under continuous static tension-stress (5kPa) combined with TGF-β1. Theseresults proved that mechanical stimulus and TGF-β1 in vitro could influence and regulate thegrowth of condylar chondrocytes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1125.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Researches on the photoconductivity and UV-visible absorption spectra of the first C60-chemically modified poly(N-vinylcarbazole) (1996)
    Springer
    Polymer bulletin 36 (1996), S. 203-208 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Addition of C60 moiety, a powerful electron acceptor to poly(N-vinylcarbazole) by chemical reaction results in the marked enhancement in photoconductivity relative to pure PVK and C60 /PVK mixtures (C60-doped PVK). The photoinduced discharge rates for pure PVK, C60-chemically modified PVK(C60-PVK copolymer) and C60-doped PVK under the same experimental conditions are found in the following order: C60-PVK copolymer〉C60-doped PVK〉pure PVK. The photoconductive performance in C60-PVK copolymer is closely related to fullerene level. The C60-PVK copolymer, which has a visibly earthy yellow cast when compared with the unreacted polymer, has a new structure in the UV-Vis absorption spectrum with the active range extending from about 280 to 870 nm. A qualitative comparison of the submicro-morphological structures for PVK, C60, C60-PVK and C60-doped PVK is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294907
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