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Harvesting net power and desalinating water by pressure-retarded membrane distillation

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Science China(Technological Sciences) 2022年第1期65卷 214-220页

作者： ZHAO RunZe LI Ji ZHANG ZiKang long rui LIU Wei LIU ZhiChun School of Energy and Pow er Engineering Huazhong University of Science and TechnologyWuhan 430074China

Pressure-retarded membrane distillation(PRMD)can convert low-grade heat to useful work by harvesting the pressure energy of the condensation liquid on the cold *** this study,a new type of PRMD system for combined freshwater and power production was *** this configuration,the thermal energy of the phase change is transported to the interface mainly by conduction rather than convection,which significantly reduces the pump power loss of the liquid *** addition,it also utilizes a multistage structure to regenerate heat with low pump power *** experimental results showed that,for a module with a heating area of 1.0 m^(2),this system can produce 188 L of freshwater and 27.8 kJ of power each day when operating between 80℃ and 40℃.The water and power densities of the PRMD configuration would be affected by saline ions in the feed liquid,air resistance in the evaporation chamber,membrane wetting,and membrane *** experimental and molecular dynamics simulation results indicated that a higher temperature difference or working temperature will significantly improve the desalination and power generation rates because of the increased mass transfer driving force of the vapor *** study proved that it is possible for a PRMD system to simultaneously obtain net power and freshwater using low-grade heat as the only energy ***,the liquid supply,working pressure,and membrane properties should be improved to achieve better performance.

关键词： desalination renewable energy low-grade heat thermo-osmosis membrane distillation

Impacts of multi-foulings on salinity gradient energy conversion process in negatively charged conical nanochannels

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Science China(Technological Sciences) 2024年第6期67卷 1714-1726页

作者： MAO ruiJie CHEN Xi ZHOU RuHong long rui LIU ZhiChun LIU Wei School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan430074China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and TechnologyWuhan430074China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan430074China

Membrane fouling inevitably occurs during nanofluidic reverse ***,the impact of multi-fouling on the energy conversion performance of negatively charged conical nanochannels under asymmetrical configurations is systematically *** results reveal that in Configuration I,where a high-concentration solution is applied at the tip side,at small concentration ratios,multiple foulings reduce the electric *** Configuration II,where a low-concentration solution is applied at the tip side,multiple foulings near the base side contribute to the electric *** fouling that formed near the lowconcentration entrance diminished the electric power and energy conversion ***-fouling lowered the electrical power consumption by 69.27%and 99.94%in Configurations I and II,*** Configuration I,the electric power first increased with increasing fouling surface charge density,reached its maximum value,and thereafter *** Configuration II,the electric power first decreased with increasing fouling surface charge density,reached its minimum value,and thereafter *** negative or positive charge densities of fouling contribute to the electric power and energy conversion efficiency.

关键词： conical nanochannel fouling nanofluidic reverse electrodialysis salinity gradient energy

Segmented taper equations with crown ratio and stand density for Dahurian Larch (Larix gmelinii) in Northeastern China

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Journal of Forestry Research 2011年第3期22卷 347-352页

作者： JIANG Li-chun LIU rui-long College of Forestry Northeast Forestry University 26 Hexing roadHarbin 150040 Heilongjiang Province P.R. China.

Segmented taper equation was selected to model stem profile of Dahurian larch （Larix gmelinii Rupr.）. The data were based on stem analysis of 74 trees from Dailing Forest Bureau in Heilongjiang Province, Northeastern China. Two taper equations with crown ratio and stand basal area were derived from the Max and Burkhart’s （1976） taper equation. Three taper equations were evaluated：（1） the original equation, （2） the original equation with crown ratio, and （3） the original equation with basal area. SAS NLIN and SYSNLIN procedures were used to fit taper equations. Fit statistics and cross-validation were used to evaluate the accuracy and precision of these models. Parameter estimates showed that the original equation with inclusion of crown ratio and basal area variables provided significantly different parameter estimates with lower standard errors. Overall fit statistics indicated that the root mean square error （RMSE） for diameter outside and inside bark decreased respectively by 10% and 7% in the original model with crown ratio and by 12% and 7.2% in the original model with basal area. Cross-validation further confirmed that the original equation with inclusion of crown ratio and basal area variables provided more accurate predictions at the lower section （relative heights, 10%） and upper section （relative heights, 50%） for both outside and inside bark diameters.

关键词： basal area crown ratio Larix gmelinii nonlinear regression taper equations

Effect of gel time of 3D sand printing binder system on quality of sand mold/core

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China Foundry 2021年第6期18卷 581-586页

作者： Yan Wang rui-long Yu Shao-kui Yin rui Tan Yan-chun Lou Shenyang Research Institute of Foundry Co. Ltd.Shenyang 110022China State Key Laboratory of Light Alloy Casting Technology for High-end Equipment Shenyang 110022China

Two important factors affecting the performance of sand mold/core generated by 3D printing(3DP)are strength and dimensional accuracy,which are not only closely related to the reactivity of furan resin and the phase transition of silica sand,but also the curing agent system of furan *** paper studies the influence of gel time on the strength and dimensional accuracy of a 3DP sand mold/core,taking the furan resin system as an example and using a sand specimen generated by a 3DP inkjet molding *** experiment demonstrates that the gel time of 3 to 6 min for the sand mixture suits 3DP core-making most under the experimental ***,it should be noted that under the same resin condition,the strength of a no-bake sand mold/core is higher than that of a 3DP sand mold/*** dimensional accuracy of the sand mold/core does not change significantly when the gel time is less than 15 *** the activity of binder and developing ultra-strong acid with low corrosion shall be an effective way to improve the quality of the mold/core by 3D printing.

关键词： 3D sand printing gel time sand strength dimensional accuracy

Fe48Co52 Alloy Nanowire Arrays： Effects of Magnetic Field Annealing

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Chinese Journal of Chemical Physics 2009年第1期22卷 82-86页

作者： Hai-lin Su Shao-long Tang rui-long Wang Yi-qing Chen Chong Jia You-wei Du School of Materials Science and Engineering Hefei University of Technology Hefei 230009 China National Laboratory of Solid State Microstructure and Department of Physics Nanjing University Nanjing 210093 China

The effects of magnetic field annealing on the properties of Fe48Co52 alloy nanowire arrays with various interwire distances （Di=30-60 nm） and wire diameters （Dw=22-46 nm） were investigated in detail. It was found that the array＇s best annealing temperature and crys- talline structure did not show any apparent dependence on the treatment of applying a 3 kOe magnetic field along the wire during the annealing process. For arrays with small Dw or with large Di, the treatment of magnetic field annealing also had no obvious influence on their magnetic performances. However, such a magnetic field annealing constrained the shift of the easy magnetization direction and improved the coercivity and the squareness obviously for arrays with large Dw or with small Di. The difference in the intensity of the effective anisotropic field within the arrays was believed to be responsible for this different variation of the array＇s magnetic properties after magnetic field annealing.

关键词： FeCo alloy, Nanowire array, Magnetic field annealing, Magnetic property Effective anisotropie field

Atroposelective sp3 C—H Coupling for Kinetic Resolution of Thioanilide Atropisomers

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Chinese Journal of Chemistry 2021年第12期39卷 3269-3276页

作者： Hua-Jie Jiang rui-long Geng Jia-Hui Wei Liu-Zhu Gong Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemistry University of Science and Technology of ChinaHefeiAnhui 230026China Center for Excellence in Molecular Synthesis of CAS HefeiAnhui 230026China

A highly efficient kinetic resolution of racemic thioanilide atropisomers via C(sp^(3))-H arylation has been achieved by a hybrid palladium catalyst bearing an anionic chiral Co^(Ⅲ)-complex and a phosphoramidite ligand,leading to both enantioenriched atropisomeric arylation thioanilides(up to 99%ee)and N-Me atropisomeric thioanilides(up to 99%ee),*** remained enantioenriched substrates can be arylated again by using an achiral anionic ligand to give the enantiomer with the opposite configuration.

关键词： Kinetic resolution C—H activation Atropisomerism Chiral Co^(Ⅲ)-complex Phosphoramidite

Effect of Niobium on Dynamic Recrystallization Behavior of 5%Ni Steel

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Journal of Iron and Steel Research International 2013年第6期20卷 38-44页

作者： LEI Xiao-rong DING Qing-feng CHEN Yuan-yuan rui Xiao-long LI Shu-rui WANG Qing-feng State Key Laboratory of Metastable Materials Science and Technology Yanshan University Research and Development Center Wuhan Iron and Steel Company

The single-pass hot compressions of two 5%Ni steels with and without niobium addition at different temperatures of 800-1 150℃and strain rates of 0.01-1s-1 were performed by using a Gleeble-3500 thermal simulator and the effect of niobium on the dynamic recrystallization （ DRX ） behavior was *** results showed that the niobium addition of 0.04% can retard DRX in 5%Ni steel significantly by increasing the activation energy for DRX from 394 to 462kJ / *** critical strain required for starting DRX in 5%Ni steel was increased by 0.04-0.10 with niobium addition when the steel was deformed at a strain rate of 0.01s-1 and temperatures varied from 950 to 1 000℃.The critical temperature required for starting DRX in 5%Ni steel was also increased from 1 000 to 1 050℃ with niobium addition when the steel was deformed at a strain rate of 0.1s-1 .Such a retarded DRX occurring in Nb-added 5%Ni steel can be attributed to the pinning effect of precipitates containing niobium.

关键词： 5%Ni steel dynamic recrystallization niobium precipitation pinning effect

Preparation and surface modification of 3D printed Ti-6Al-4V porous implant

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Rare Metals 2021年第5期40卷 1164-1172页

作者： Chun-Yong Liang Xiao-Jing Jiang rui-long Ji Bao-E Li Xian-rui Zou Hong-Shui Wang Jing-Zu Hao Tai Yang School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Tianjin Key Laboratory of Laminating Fabrication and Interface Control Technology for Advanced Materials Hebei University of TechnologyTianjin 300130China

Three-dimensional(3D)printed titanium alloy implants hold enormous potential in orthopedic applications to avoid stress ***,titanium alloy is bioinert,limiting its application and making surface modification a *** this paper,porous implants were treated by acid etching and anodizing to improve the bioactivity,which was evaluated by simulated body fluid(SBF)immersion *** results showed that,after surface modification,micro-nanocomposite structures were obtained on the titanium surface,and after immersing in SBF for 2 weeks,the implants showed a drastically enhanced apatite forming ability,confirming improved ***,the surface structures were different at different positions and it is believed that this phenomenon is closely related to the different current densities of the surfaces during anodic *** research evaluates the effect of anodic oxidation at different voltages on the surface modification and provides a reference for improving the bioactivity of the medical porous implant surface prepared by 3 D printing.

关键词： Three-dimensional(3D)printing Porous implants Anodic oxidation Composite structure Current density

Preparation of coated sand for selective laser sintering and optimization of baking process of sand moulds

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China Foundry 2023年第6期20卷 519-525页

作者： Peng-wei Wang rui-long Yu rui Tan Yan Wang Ying-wei Zhou Yue-ting Ma Yan-hai Li Jia-jun Liu Shao-kui Yin Shenyang Research Institute of Foundry Co. Ltd.CAMShenyang 110022China National Key Laboratory of Advanced Casting Technologies Shenyang 110022China

A cold method was used to prepare coated sand for application in the selective laser sintering(SLS)*** strength,loss on ignition,gas evolution,and accuracy of the SLS samples were tested and analyzed,and the baking process was thoroughly *** with coated sand prepared by the hot method,the cold method yields a more uniform and complete resin film on the sand's surface,resulting in enhanced tensile strength and ***,the cold method requires a lower binder content to meet the same strength requirements,thereby minimizing gas evolution,reducing porosity defects,and ultimately improving casting *** coated sand samples prepared through the cold method exhibit superior accuracy,with a size error of within±0.4 *** contrast,the coated sand samples prepared by the hot method display a lower accuracy,with an average negative error of 2.1993 *** highest tensile strength could be attained by controlling the baking temperature within a suitable range(180-190℃),which can effectively reduce the generation of gas,thus contributing to improved overall performance.

关键词： selective laser sintering(SLS) coated sand cold method hot method baking