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Inhibition of different types of inert dust on aluminum powder explosion

Chinese Journal of Chemical Engineering 2020年第7期28卷 1941-1949页

作者： Linlin Dai Lin Hao Wei kang Wei Xu Ning shi HongyuanWei School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Institute of Qingdao Safety Engineering China Petroleum&Chemical CorporationQingdao 266000China

Aluminum powder explosion accidents occurred frequently,but the mechanism of aluminum powder explosion is ***,the inhibitive effect of aluminum powder explosion plays a key *** evaluate the inhibition capacity of different kinds of carbonates and phosphates:Na H2PO4,(NH4)2HPO4,NH4H2PO4,KHCO3 and Na HCO3 on aluminum deflagrations,a standard 20-L spherical chamber was used to determine the explosion severity,characterized by the maximum explosion pressure(Pmax).New parameters have been proposed:the minimum significant inert concentration(MSIC)and the minimum complete inert concentration(MCIC),which characterized the effect of *** results showed that from the minimum significant inert concentration(MSIC)and the minimum complete inert concentration(MCIC),phosphate can have a significant inhibiting effect.40%Na H2PO4 can totally inert the aluminum explosion,and 50%(NH4)2HPO4or 50%NH4H2PO4 can also suppress the *** simulation,phosphate mainly acts via a chemical inhibition pathway,which inhibits the reaction of aluminum powder and oxygen by catalyzing the recombination of H atoms and O *** performs inhibition in chemically,producing CO2,diluting the oxygen around the aluminum *** indicated that the explosion pressure of the mixture decreases as the concentration of inert dust ***,when the concentration of carbonates was low,SEEP(suppressant enhanced explosion parameter)phenomenon was *** research work has a potential industrial application in high hazard aluminum working condition,which can help decrease the explosion pressure and reduce the accident loss.

关键词： Aluminum dust explosion Inert Carbonate Phosphate Maximum explosion pressure

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Synthesis of Crown Ether-tethered b-Cyclodextrin and Fabrication of Its Self-assembled Monolayer on Gold Surface

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Chinese Chemical Letters 2001年第10期12卷 891-892页

作者： Yu LIU shi Zhao kang Chun Hua DIAO Department of Chemistry Nankai UniversityTianjin 300071

A novel b-cyclodextrin derivative 6 bearing a crown ether moiety has been synthesized by a convenient method in 9.4% yield. Its self-assembled monolayer (SAM) was fabricated on the gold surface, which was characteriz... 详细信息

关键词： Cyclodextrin derivative crown ether self-assembled monolayer.

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Machine learning for deep elastic strain engineering of semiconductor electronic band structure and effective mass

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npj Computational Materials 2021年第1期7卷 694-703页

作者： Evgenii Tsymbalov Zhe shi Ming Dao Subra Suresh ju Li Alexander Shapeev Skolkovo Institute of Science and Technology MoscowRussia Department of Materials Science and Engineering and Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMAUSA Nanyang Technological University SingaporeRepublic of Singapore

The controlled introduction of elastic strains is an appealing strategy for modulating the physical properties of semiconductor *** the recent discovery of large elastic deformation in nanoscale specimens as diverse as silicon and diamond,employing this strategy to improve device performance necessitates first-principles computations of the fundamental electronic band structure and target figures-of-merit,through the design of an optimal straining *** simulations,however,call for approaches that combine deep learning algorithms and physics of deformation with band structure calculations to custom-design electronic and optical *** by this challenge,we present here details of a machine learning framework involving convolutional neural networks to represent the topology and curvature of band structures in *** calculations enable us to identify ways in which the physical properties can be altered through“deep”elastic strain engineering up to a large fraction of the ideal *** capable of active learning and informed by the underlying physics were presented here for predicting the bandgap and the band *** training a surrogate model with ab initio computational data,our method can identify the most efficient strain energy pathway to realize physical property *** power of this method is further demonstrated with results from the prediction of strain states that influence the effective electron *** illustrate the applications of the method with specific results for diamonds,although the general deep learning technique presented here is potentially useful for optimizing the physical properties of a wide variety of semiconductor materials。

关键词： strain deformation electronic

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An investigation on topologies of hybrid manifold,impinging-jet nozzle and micro-pin-fin heat sinks

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Science China(Technological Sciences) 2024年第4期67卷 1061-1076页

作者： shi QianLei YAO XiaoLe LIU Qian QIN Le ju Xing XU Chao Key Laboratory of Power Station Energy Transfer Conversion and System of MOE North China Electric Power UniversityBeijing 102206China

The hybrid manifold micro-pin-fin(MMPF)heat sink combined nozzle jets is an option for large-scale integrated circuits(LSI).The demond for uniform and ultra-high heat flux removal by MMPF heat sink has not been adequately *** work aims to solve the problem of fluid *** proposed basic tiling topologies,including square,regular hexagon,30°rhombus,and 60°rhombus topologies,provide different organized fluid flows and heat transfer *** present study focuses on comparing these topologies according to independent porous medium parameters,such as nozzle pore size D_(Z),flow pore size D_(X,Y),and porosityε.The results show that the square topology achieves the smallest total thermal resistance R_(tot)value of0.0975×10^(-4)K m^2/W,while the hexagon topology achieved the highest value of COP/?T,which was 2033.9 K^(-1).According to the sensitivity analysis results,the optimal total thermal resistance can be obtained by balancing the influences of nozzle pore size,flow pore size,and *** optimal pressure drop can be obtained by maximizing the porosity.

关键词： heat sink ultra-high heat flux manifold micro-pin-fin impinging-jet topology

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Optimal concentration of mesenchymal stem cells for fracture healing in a rat model with long bone fracture

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World Journal of Stem Cells 2022年第12期14卷 839-850页

作者： Myung-Seo Kim Hyun-ju Chung kang-Il Kim Department of Orthopaedic Surgery School of MedicineKyung Hee University and Kyung Hee University Hospital at GangdongSeoul 05278South Korea Department of Core Research Laboratory Clinical Research InstituteKyung Hee University Hospital at GangdongSeoul 05278South Korea

BACKGROUND There is still no consensus on which concentration of mesenchymal stem cells(MSCs)to use for promoting fracture healing in a rat model of long bone *** To assess the optimal concentration of MSCs for promoting fracture healing in a rat *** Wistar rats were divided into four groups according to MSC concentrations:Normal saline(C),2.5×10^(6)(L),5.0×10^(6)(M),and 10.0×10^(6)(H)*** MSCs were injected directly into the fracture *** rats were sacrificed at 2 and 6 wk *** bone formation[bone volume(BV)and percentage BV(PBV)]was evaluated using micro-computed tomography(CT).Histological analysis was performed to evaluate fracture healing *** protein expression of factors related to MSC migration[stromal cell-derived factor 1(SDF-1),transforming growth factor-beta 1(TGF-β1)]and angiogenesis[vascular endothelial growth factor(VEGF)]was evaluated using western blot *** expression of cytokines associated with osteogenesis[bone morphogenetic protein-2(BMP-2),TGF-β1 and VEGF]was evaluated using real-time polymerase chain *** Micro-CT showed that BV and PBV was significantly increased in groups M and H compared to that in group C at 6 wk post-fracture(P=0.040,P=0.009;P=0.004,P=0.001,respectively).Significantly more cartilaginous tissue and immature bone were formed in groups M and H than in group C at 2 and 6 wk post-fracture(P=0.018,P=0.010;P=0.032,P=0.050,respectively).At 2 wk post fracture,SDF-1,TGF-β1 and VEGF expression were significantly higher in groups M and H than in group L(P=0.031,P=0.014;P<0.001,P<0.001;P=0.025,P<0.001,respectively).BMP-2 and VEGF expression were significantly higher in groups M and H than in group C at 6 wk postfracture(P=0.037,P=0.038;P=0.021,P=0.010).Compared to group L,TGF-β1 expression was significantly higher in groups H(P=0.016).There were no significant differences in expression levels of chemokines related to MSC migration,angiogenesis and cytokines associated

关键词： Rat model Femoral shaft fracture Mesenchymal stem cells Direct injection Optimal concentration Fracture healing

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Analysis of meso-inhomogeneous deformation on a metal material surface under low-cycle fatigue

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Acta Mechanica Solida Sinica 2017年第6期30卷 557-572页

作者： Gui-Long Liu Ke-shi Zhang Xian-Ci Zhong Jiann Woody ju College of Civil Engineering and Architecture Guangxi University Key Lab of Disaster Prevention and Structural Safety Guangxi Key Lab Disaster Prevention and Engineering Safety Nanning 530004 China College of Mathematics and Information Science Guangxi University Nanning 530004 China Department of Civil and Environmental Engineering University of California Los Angeles CA 90095-1593 USA

A polycrystalline Voronoi aggregation with a free surface is applied as the representative volume element（RVE）of the nickel-based GH4169 *** the plastic deformation mechanism at the grain level and the Bauschinger effect,a crystal plasticity model reflecting the nonlinear kinematic hardening of crystal slipping system is *** microscopic inhomogeneous deformation during cyclic loading is calculated through numerical simulation of crystal *** deformation inhomogeneity on the free surface of the RVE under cyclic loading is described respectively by using the following parameters：standard deviation of the longitudinal strain in macro tensile direction,statistical average of first principal strains,and standard deviation of longitudinal *** relationship between the fatigue cycle number and the evolution of inhomogeneous deformation of the material’s free surface is *** research finds that：（1）The inhomogeneous deformation of the material free surface is significantly higher than that of the RVE inside;（2）the increases of the characterization parameters of inhomogeneous deformation on the free surface with cycles reflect the local maximum deformation of the RVE growing during cyclic loading;（3）these parameters can be used as criteria to assess and predict the low-cycle fatigue life rationally.

关键词： Inhomogeneous deformation Surface Grain-level Crystal plasticity Low-cycle fatigue Life prediction

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Integrability and Gauge Fixing for Bosonic String on AdS_3×S^3

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Communications in Theoretical Physics 2008年第7期50卷 129-132页

作者： KE San-Min WANG Chun shi kang-Jie College of Science Chang＇an University Xi＇an 710064 China Institute of Modern Physics Northwest University Xi＇an 710069 China College of Science Xi＇an Shiyou University Xi＇an 710065 China

The integrability and the TST transformation of the bosonic string on AdS3× S^3 are studied. The Lax connection for gauge fixed theory is constructed and proved to be fiat.

关键词： integrability TST transformation Lax connection fiat

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H_2^+-Like Impurities Confined by Spherical Quantum Dots:a Candidate for Charge Qubits

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Communications in Theoretical Physics 2008年第9期50卷 767-770页

作者： kang Shuai LIU Yi-Ming shi Ting-Yun Department of Physics and Information Engineering Hunan Institute of Humanities Science and Technology Loudi 417000 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics The Chinese Academy of Sciences Wuhan 430071 China Department of Physics Shaoguan University Shaoguan 512005 China

We have calculated the electron energy of the ground and lower excited states for H_2^+-like impurity statesconfined in finite spherical quantum dots in *** on the characteristics of energy levels,we have proposed ascheme for realizing charge qubit composed by the the ground and the first excited states of this confined double donorsystem for the first *** the proposed scheme the charge qubit is coded in terms of the located electronic states.

关键词： spherical quantum dot charge qubit B-splines H2^+-like impurities

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Boson-Fermion Duality in A2 Toda Field Theory

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Communications in Theoretical Physics 2002年第6期37卷 679-682页

作者： YANG Zhan-Ying ZHAO Liu shi kang-Jie Institute of Modern Physics Northwest University Xi''an 710069 China Institute of Modern Physics Northwest University Xi''an 710069 China Institute of Modern Physics Northwest University Xi''an 710069 China

In this paper, we consider a two-dimensional integrable and conformal invariant field theory with two Diracspinors and two scalar fields. This model has chiral symmetry and CP-like symmetry. Moreover, this model also ... 详细信息

关键词： duality conformal invariant

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Effects of Phosphorus Application in Different Soil Layers on Root Growth, Yield, and Water-Use Efficiency of Winter Wheat Grown Under Semi-Arid Conditions

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Journal of Integrative Agriculture 2014年第9期13卷 2028-2039页

作者： kang Li-yun YUE Shan-chao LI shi-qing Sate Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau Northwest Agriculture and Forestry University College of Forestry Northwest Agriculture and Forestry University

Deep phosphorus application can be a usefull measure to improve crops＇ performance in semi-arid regions, but more knowledge of both its general effects and effects on specific crops is required to optimize treatments. Thus, the aims of this study were to evaluate the effects of phosphorus（P） application at different soil layers on root growth, grain yield, and water-use efficiency（WUE） of winter wheat grown on the semi-arid Loess Plateau of China and to explore the relationship between root distribution and grain yield. The experiment consisted of four P treatments in a randomized complete block design with three replicates and two cultivars： one drought-sensitive（Xiaoyan 22, XY22） and one drought-tolerant（Changhan 58, CH58）. The four P treatments were no P（control, CK）, surface P（SP）, deep P（DP）, and deep-band P application（DBP）. CH58 produced larger and deeper root systems, and had higher grain yields and WUE, under the deep P treatments（DP and DBP） than under SP, clearly showing that deep P placement had beneficial effects on the drought-tolerant cultivar. In contrast, the grain yield and root growth of XY22 did not differ between DP or DBP and SP treatments. Further, root dry weight（RW） and root length（RL） in deep soil layer（30-100 cm） were closely positively correlated with grain yield and WUE of CH58（but not XY22）, highlighting the connections between a well-developed subsoil root system and both high grain yield and WUE for the drought-tolerant cultivar. WUE correlated strongly with grain yield for both cultivars（r=0.94, P〈0.001）. In conclusion, deep application of P fertilizer is a practical and feasible means of increasing grain yield and WUE of rainfed winter wheat in semi-arid regions, by promoting deep root development of drought-tolerant cultivars.

关键词： water stress phosphorus application soil layers grain yield root growth water-use efficiency

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