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  • 1
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    A cryogenic heat exchanger with bypass and throttling and its thermodynamic analysis (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-12-19
    Description: A precooled Joule-Thomson (J-T) cooler refrigerates at liquid helium temperature. Its third stage heat exchanger works below 20 K. Hot fluid cannot be sufficiently cooled due to nonidealism of the heat exchanger and helium-4 properties. In a J-T cycle of low pressure ratio, the heat exchanger with bypass and throttling improves the refrigeration capacity. Bypass and throttling reduces the temperature difference and entropy generation within the heat exchanger.
    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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  • 2
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    The preparation of nanosized polyethylene particles via novel heterogeneous non-metallocene catalyst ( m -CH 3 PhO)TiCl 3 /CNTs/AlEt 3 (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-08-09
    Description: This paper reports the preparation of coral-shaped topological morphology nascent polyethylene (PE) particles promoted by the novel heterogeneous non-metallocene catalyst ( m -CH 3 PhO)TiCl 3 /carbon nanotubes (CNTs), with AlEt 3 used as a cocatalyst. Scanning electron microscope (SEM), high resolution transmission electron microscope (HR-TEM) and inductively coupled plasma (ICP) emission spectroscopy were used to determine the morphology of the catalyst particles and the content of ( m -CH 3 PhO)TiCl 3 . The carbon nanotube surface was treated with Grignard Reagent prior to reacting with ( m -CH 3 PhO)TiCl 3 . The catalyst system could effectively catalyze ethylene polymerization and ethylene with 1- hexene copolymerization, the catalytic activity could reach up to 5.8 kg/((gTi)h). Morphology of the obtained polymer particles by SEM and HR-TEM technique revealed that the nascent polyethylene particle...
    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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  • 3
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    Tensile deformation mechanisms of ABS/PMMA/EMA blends (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-08-09
    Description: The tensile deformation mechanisms of acrylonitrile – butadiene – styrene (ABS) / polymethyl methacrylate (PMMA) blends toughened by ethylene methacrylate (EMA) copolymer was investigated by analysing the fracture morphology. ABS/PMMA was blended with EMA copolymer by melt mixing technique using co-rotating twin extruder. Tensile tests show that the elongation at break of ABS/PMMA blends can be efficiently improved with the increase in EMA content. Fracture morphology of ABS/PMMA/EMA blends reveals that the material yield induced by hollowing-out of EMA particles and its propagation into yield zone is the main toughening mechanism. Moreover, the appearance that EMA particles in the central area are given priority to hollowing-out may be related to the skin-core structure of the injection moulded parts caused by the different cooling rate between surface and inside in the process of injection moulding.
    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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  • 4
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    Selective enrichment and sensitive detection of candidate disease biomarker using a novel surfactant-coated magnetic nanoparticles (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-08-23
    Description: In this study, novel surfactant-coated magnetic nanoparticles were synthesized and evaluated for enrichment performance towards the sensitive detection of disease biomarkers. Surfactants with phosphate ester groups (RD35A and RD66) were used as a coating to reduce aggregation and to enhance the nanoparticle dispersion. Importantly, sensitive enrichment of the target proteins using the antibody-functionalized magnetic nanoparticles (Ab@MNP) was obtained, with a five-fold increase in recovery compared to uncoated magnetic nanoparticles. Similarly, phosphopeptide enrichment using the NTA@MNP in standard samples showed that the nanoparticles could selectively enrich phosphorylated peptides.
    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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  • 5
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    Research on hydrodynamic performance of a tubular turbine under tidal wave condition (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-07-31
    Description: Tubular turbine running environment will be affected by ocean tidal wave, under the influence of the tidal wave, the hydrodynamic performance of the tubular turbine and its water-energy conversion efficiency have become the focus of our research and discussion. This paper explores the mechanism of wave-current coupling under surface fluctuations, considering the influence of tidal wave flow and gravity influence in flow field and flow characteristics of tubular turbine. The study on the performance of the influence of hydraulic characteristics of tubular turbine under the condition of wave flow has been carried out. Results show that the wave flow conditions with considering gravity leads to mechanical runner blade be damaged by tidal wave of pressure fluctuation and cyclic extrusion, causing more serious than fatigue stress damage than no wave flow condition does which make this kind of fluid machinery practical fatigue life is reduced greatly. The condition of the wave flow co...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 6
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    Numerical prediction of rotating stallin a low-specific speed centrifugal pump (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-07-31
    Description: Rotating stall is a common unstable flow phenomenon in centrifugal pumps, which usuallyoccurs in part-load conditions. Rotating stall will cause performance instability when thepump is running, and even excite the resonance of the whole pump system in someextreme cases. In this paper, the stall phenomena at part-load conditions have beeninvestigated by CFDsimulation for a centrifugal pump. The CFD results have beencompared with the experiments, including characteristic curves, internal flow structures andcorresponding frequency spectrum analyses. Furthermore, a parameter named theblockage coefficient for the pump impeller passage is put forward to quantitativelyevaluate the magnitude of stall.The large-scale vortex in the stalled channel is defined as astall cell.At the operation condition Q=0.35Q 0 , five rotating stall cells can be observedin the impeller, which propagate among different impeller channels with a rotatingfrequency lower than that of the impeller. From ...
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    Topics: Geography , Geosciences , Physics
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  • 7
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    Multi-objective optimization design of the intake duct for a waterjet system (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-07-31
    Description: An intake duct for a waterjet system is treated to improve the hydraulic efficiency and the outflow nonuniformity together with its perpendicularity. A multi-objective optimization strategy is proposed by incorporating with design of experiments (DOE), computational fluid dynamics (CFD), inverse design method, Kriging model and non-dominated sorting genetic algorithm-II (NSGA-II). Optimal Latin hyper-cube design method is used in DOE to uniformly sample in variation ranges, and global optimization is then conducted by using NSGA-II based on the input-target approximation functions approximated by the Kriging model. Instead of randomly selecting one solution to implement, a technique for ordering preferences by similarity to ideal solution (TOPSIS) is introduced to select the best compromise solution (BCS) from pareto-front sets. Compared with the original duct, the optimized intake duct has a much better outflow quality at the design operation point with a comparative hydraulic ...
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    Topics: Geography , Geosciences , Physics
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  • 8
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    Application of D-InSAR technology in urban land subsidence measurement: A case study on Beihai city (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-10-12
    Description: Land subsidence monitoring is of great significance for the city safety and development. D-InSAR technology is widely used in city ground subsidence monitoring as the development of synthetic aperture radar satellite applications, because of the surface deformation information in all-weather conditions with merits of large coverage, fast reaction and high accuracy. This paper studied and analyzed the land subsidence in Beihai by the track method of differential radar interferometry; the information of land subsidence was obtained. The distribution of land subsidence in Beihai city is widespread; the maximum land subsidence was 0.1567m in the studying area from 2001 to 2011, with the maximum annual average subsidence rate of 0.0157m/a, the most serious land subsidence point is located in E109°16′49.443″, N21°37′45.243″. Combined with the field investigation, ascertain the main influencing factors of land subsidence in Beihai city is the exploitation of groundwater resources. The ...
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    Topics: Geography , Geosciences , Physics
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  • 9
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    Anaerobic co-digestion of wastes from fruit processing and activated sludge reactor in juice production industry (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-10-12
    Description: Anaerobic co-digestion of wastes from fruit processing wastes (FPW) and activated sludge reactor (WAS) were studied in a semi-continuous digester at 30-32 °C during 193 days. The best results of biogas yield and volumetric biogas production were 635.4 L·kg −1 total volatile solids (TVS) fed and 473.9 L·m −3 ·d −1 , respectively, obtained when FPW:WAS ratio applied was 1:1 and retention time was 40 days. Biogas yield and volumetric biogas production increased 210% and 357%, respectively, when FPW:WAS ratio was changed from 0:1 to 1:1; and hydrolysis was also improved since TVS removal efficiency achieved nearly 75%. The microbiological analysis of samples taken at day 70, 135 and 168 supported these results with increased FPW:WAS ratio. Both the relative abundance of methanogens and hydrolytic bacteria were observed to increase significantly; in the case of hydrolysis, the percentage of Chloroflexi relative abundance increased from 17% at day 70...
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    Topics: Geography , Geosciences , Physics
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  • 10
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    Numerical Simulation Analysis of Temperature Control of Large Volume Concrete Aqueduct (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-12-20
    Description: The Equivalent Heat Transfer Coefficient Method (EHTCM) is extended to the simulation of transient heat transfer problems for Large-scale concrete aqueducts in the construction process. The present EHTCM consists of the following ingredients: (1) a novel cell death and birth technique is proposed to deal with the existence or nonexistence of the concrete insulation layers, and hence the construction process of aqueducts can be easily simulated; (2) a simplified formula for specific heat transfer is implemented to improve the efficiency of transient computations. Several typical models and examples are selected to verify the performance of this method. On the basis of the weakened weak formulation, the EHTCM is spatially stable and convergent to the exact solution. The EHTCM can achieve the same results in accuracy and convergence rate, in comparison with the actual model method.
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    Topics: Geography , Geosciences , Physics
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