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  • Springer  (84)
  • Institute of Physics (IOP)  (12)
  • 1
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    Resistance loss analysis and structure optimization of conical diffuser in siphon rectifying device (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-07-31
    Description: Siphon water conveyance is a commonly used way to transport water in high efficiency, and its core equipment is the submerged rectifying device at the entrance. Due to the complex structure inside the device, the local resistance loss is too high, which has a certain impact on the water delivery efficiency. By taking the single conical diffuser inside the siphon rectifying device as the research object, analyzing the mesh generation and the simulation strategy. Of which the target is reducing the resistance loss. Then the optimal plan is y w =10μm, N=20, R=1.3, using k-ε standard. And the analyzing of the head loss in each part of the conical diffuser is based on the simulation results. The obtained head loss of the diffuse part account for 40%-50% of the total loss. The parametric analysis of the conical diffuser structure is carried out for the diffuse part. Through the orthogonal design and the result analyzed, the optimal structural scheme is L1=36mm, L2=74mm, D1=17...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 2
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    Study on the influence of blade outlet angle on unsteady flow and structural dynamic characteristics for chemical process pump (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-07-31
    Description: In order to reveal the influence of the blade outlet angle on the structural dynamic characteristics of chemical process pump, a chemical process centrifugal pump with high specific speed was selected to be researched, and 4 impellers with different blade outlet angle were redesigned based on the prototype pump, which ensuring that the other geometrical parameters unchanged. The blade outlet angle designed are 27°, 37°, and 47°, referring to the original impeller whose blade outlet angle was 22°. Then, the numerical calculation was applied for each scheme under designed condition based on the bidirectional coupling fluid- structure interaction (FSI) simulations. Through simulation, the head after the fluid-solid coupling was lower than before, but the error was reduced. Comparing the distribution of equivalent stress at intersection boundary, it shows that the places from 0.6 times to 0.8 times at the outlet of the intersection boundary of stress side and shroud were greatly aff...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 3
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    Parameters sensitivity analysis of DO in water quality model of QUAL2K (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-11-06
    Description: QUAL2K is a comprehensive longitudinal one-dimension steady-state water quality model, which considers the effect on dissolved oxygen (DO) through nitrogen circulation, algae growth and sediment oxidation process. And this model integrated hydrological model and temperature model, so it is widely adopted in the overseas. Because of its complexity and multiple parameters, the application of this model is restricted in China. Parameters optimization is inevitable in the usage of the water quality model. The modified Morris screening method is used and DO is selected as study index to proceed sensitivity analysis and further optimize related parameters. The high sensitive parameters, sensitive parameters and low sensitive parameters are determined.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 4
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    Research on Structural Strength of 7800 PCTC under Flexible Design (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-08-21
    Description: In this paper, we use the finite element software MSC·PATRAN and MSC·NASTRAN to establish the FEM model. Then we analyze the racking condition strength under the conditions of inclined shipping, and discuss the stress of the hull structure, the distribution of the hot spot and the deformation of the deflection under the flexible design concept. Some general conclusions under the design concept are obtained, which will be expected to contribute to the development of the design concept of the whole ship flexible structure.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 5
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    Study on the structure of topsoil aggregates for Mu Us sandy land in China (2016)
    Institute of Physics (IOP)
    Details
    Publication Date: 2016-09-27
    Description: It is significantly important to study the topsoil aggregates occurrence for land use, recovery at regional scale and protecting from topsoil sandification. Based on land sampling through experimental analysis and correlation statistics, this paper studies on the characteristics and the correlation of different habitat topsoil aggregates in Mu Us region. The results show: The soil aggregates are mainly micro aggregates in the range of 0.5∼0.25mm in this area. The contents of soil aggregates are different in different depths which are 0cm〉10cm〉20cm respectively. The contents of soil aggregates are also different in different habitats, and the contents of 〉1mm soil aggregates are highest 4.27% and 3.55% in poplar woodland and Calamagrostisepigeios grassland sampled at the 0cm depth. After analyzing the stability of soil aggregates, the development of soil aggregates is not sufficient, and the stability of soil aggregates is poor. The soil structure is gradually optimized ...
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    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 6
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    Laser Cladding Synthesis of Ta 2 O 5 Coatings on a Ta Substrate (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-10-04
    Description: A five-layer overlaid Ta 2 O 5 dense ceramic coating was successfully fabricated on a pure Ta substrate using laser cladding. The coating exhibits a graded microstructure with a single phase of α-Ta 2 O 5 formed towards the top of the coating, and was metallurgically bonded to the Ta substrate. Both the coating and the coating-substrate interface region were free from porosity. The development of the coating’s microstructure was discussed based on an existing Ta-O phase diagram.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
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    AuRu/ meso -Mn 2 O 3 : A Highly Active and Stable Catalyst for Methane Combustion (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-05-17
    Description: Three-dimensionally ordered mesoporous Mn 2 O 3 ( meso -Mn 2 O 3 ) and its supported Au, Ru, and AuRu alloy (0.49 wt% Au/ meso -Mn 2 O 3 , 0.48 wt% Ru/ meso -Mn 2 O 3 , and 0.97 wt% AuRu/meso-Mn 2 O 3 (Au/Ru molar ratio = 0.98)) nanocatalysts were prepared using the KIT-6-templating and polyvinyl alcohol-protected reduction methods, respectively. Physicochemical properties of the samples were characterized by means of numerous techniques, and their catalytic activities were evaluated for the combustion of methane. It is found that among all of the samples, 0.48 wt% Ru/ meso-Mn 2 O 3 and 0.97 wt% AuRu/ meso -Mn 2 O 3 performed the best (the reaction temperature ( T 90% ) at 90% methane conversion was 530-540°C), but the latter showed a better thermal stability than the former. The partial deactivation ...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
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    Optimization design and compare of different solar-ground source heat pump system of office building in cold regions (2016)
    Institute of Physics (IOP)
    Details
    Publication Date: 2016-09-27
    Description: This paper presents two different operation modes of Solar-Ground Source Heat Pump System (SGSHP(S)). With the simulation tool TRNSYS, two different SGSHP system models were built to taking simulation. After making analysis and compare of different simulation results, series operation mode was believed to be better than parallel in the target building.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of Environment on Wild Oat (Avena fatua) Control with Imazamethabenz or Fenoxaprop Tank-Mixed with Additives or MCPA (1997)
    Springer
    Journal of plant growth regulation 16 (1997), S. 63-67 
    Details
    ISSN: 1435-8107
    Keywords: Key Words. Phytotoxicity—Drought—Temperature—Imazamethabenz—Fenoxaprop—Additives—MCPA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. Greenhouse and growth chamber experiments were conducted to determine the effect of soil moisture and temperature on the phytotoxicity in wild oat of imazamethabenz or fenoxaprop tank-mixed with certain additives or MCPA. The surfactants Agral 90 at 0.5% and Enhance at 0.5% increased imazamethabenz phytotoxicity under both moist and drought conditions. These surfactants had no significant effect on fenoxaprop phytotoxicity regardless of the soil moisture regimes. Fenoxaprop activity was increased by ammonium sulfate [(NH4)2SO4] at 1% but only under well watered conditions. Wild oat control with imazamethabenz was also slightly enhanced in a well watered regime by the addition of sodium bisulfate (NaHSO4) at 0.13%. At high temperature (30/20°C) and low temperature (10/5°C), the phytotoxicity of imazamethabenz was increased when tank-mixed with Agral 90 at 0.25% or NaHSO4 at 0.13% compared with that when imazamethabenz was applied alone, if soil moisture was adequate. There was no such increase under conditions of drought and high temperature. (NH4)2SO4 at 1% did not significantly affect imazamethabenz performance irrespective of temperature/soil moisture conditions. The phytotoxicity to wild oat of imazamethabenz or fenoxaprop was not changed by tank-mixing with MCPA isooctyl ester at 300 g a.i./ha, regardless of soil moisture levels. The reduced fenoxaprop phytotoxicity in wild oat due to moisture stress was not readily alleviated by the inclusion of selected additives or MCPA in the tank mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00006979
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  • 10
    Electronic Resource
    Electronic Resource
    Properties of solutions for a chemotaxis system (1997)
    Springer
    Journal of mathematical biology 35 (1997), S. 949-966 
    Details
    ISSN: 1432-1416
    Keywords: Key words: Chemotaxis ; Endothelial ; Angiogenesis ; Parabolic system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract.  We investigate mathematically the system of equations proposed by Chaplain and Stuart [2], to describe the chemotactic response of endothelial cells under the angiogenesis stimulus. In particular, we characterize the steady state endothelial cell density function, and give conditions on the chemotactic parameter k and cell proliferation parameter b that ensure that migration/ proliferation either does or does not occur in steady state. The time dependent problem is also treated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002850050084
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