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Stabilized seventh-order dissipative compact scheme for two-dimensional Euler equations

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Chinese Physics B 2019年第10期28卷 408-416页

作者： Jia-xian Qin Ya-Ming Chen Xiao-Gang deng College of Aerospace Science and Engineering National University of Defense Technology

We derive in this paper a time stable seventh-order dissipative compact finite difference scheme with simultaneous approximation terms(SATs) for solving two-dimensional Euler equations. To stabilize the scheme, the choice of penalty coefficients for SATs is studied in detail. It is demonstrated that the derived scheme is quite suitable for multi-block problems with different spacial steps. The implementation of the scheme for the case with curvilinear grids is also *** experiments show that the proposed scheme is stable and achieves the design seventh-order convergence rate.

关键词： compact scheme time stability simultaneous approximation term interface treatment

Employing halogen-halogen interaction to construct high-temperature hybrid perovskite phase transition materials

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Chinese Chemical Letters 2023年第6期34卷 521-524页

作者： Dongying Fu Zuoming hou Zhuo Chen Yueyue He xian-Ming Zhang Institute of Crystalline Materials Shanxi UniversityTaiyuan 030006China State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi UniversityTaiyuan 030006China

Organic-inorganic hybrid perovskites(OIHPs)materials with high phase transition temperature(T_(p))have been widely studied in the field of molecular switches,solar energy and electric *** present,the OIHPs with high T_(p)are generally constructed through molecular design,which can be applied to a wide temperature ***,three one-dimensional(1D)OIHPs[R-Cl EQ]PbCl_(3)(T_(p)=442 K),[R-Cl EQ]PbBr_(3)(T_(p)=499 K)and[R-Cl EQ]PbI_(3)(T_(p)above m.p.)(R-Cl EQ=(R)-N-chloroethyl-3-quinuclidinol)with different T_(p)are obtained by regulating the halogen-halogen interaction and hydrogen bonding in the *** in[R-Cl EQ]Pb X_(3)(X=Cl,Br and I)crystal system,all the halogen bonds tend to form at approximately 180°angles and the strength of halogen bonding is found to be increased from 1.59×10^(-3)Hartree to 2.35×10^(-3)Hartree with increased atom number from Cl to *** synergistic effect of halogen bonding and hydrogen bonding provide a useful strategy for the design OIHPs phase transition materials with high T_(p).

关键词： Halogen-halogen interaction Phase transition Hybrid perovskite Molecular designing

Development of a Drilling and Coring Test-bed for Lunar Subsurface Exploration and Preliminary Experiments

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Chinese Journal of Mechanical Engineering 2014年第4期27卷 673-682页

作者： SHI Xiaomeng deng Zongquan QUAN Qiquan TANG Dewei hou Xuyan JIANG Shengyuan School of Mechatronics Engineering Harbin Institute of Technology

Drill sampling has been widely employed as an effective way to acquire deep samples in extraterrestrial exploration. A novel sampling method, namely, flexible-tube coring, was adopted for the Chang＇e mission to acquire drilling cores without damaging stratification information. Since the extraterrestrial environment is uncertain and different from the terrestrial environment, automated drill sampling missions are at risk of failure. The principles of drilling and coring for the lunar subsurface should be fully tested and verified on earth before launch. This paper proposes a test-bed for conducting the aforementioned experiments on earth. The test-bed comprises a rotary-percussive drilling mechanism, penetrating mechanism, drilling medium container, and signal acquisition and control system. For granular soil, coring experiments indicate that the sampling method has a high coring rate greater than 80%. For hard rock, drilling experiments indicate that the percussive frequency greatly affects the drilling efficiency. A multi-layered simulant composed of granular soil and hard rock is built to test the adaptability of drilling and coring. To tackle complex drilling media, an intelligent drilling strategy based on online recognition is proposed to improve the adaptability of the sampling drill. The primary features of this research are the proposal of a scheme for drilling and coring a test-bed for validation on earth and the execution of drilling experiments in complex media.

关键词： drilling and coring device test-bed lunar soil sampling

HOXC10 up-regulation promotes gastric cancer cell proliferation and metastasis through MAPK pathway

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Chinese Journal of Cancer Research 2017年第6期29卷 572-580页

作者： Chen Guo Jianing hou Sheng Ao Xingming deng Guoqing Lyu Department of Biochemistry and Molecular Biology School of Basic Medical SciencesPeking UniversityBeijing 100191China Department of Gastrointestinal Surgery Peking University Shenzhen HospitalShertzhen 518036China

Objective： As an important regulator of embryonic morphogenesis, homeodomain-containing gene 10 （HOXC10） has been found to promote progression of human cancers and its expression indicates poor survival outcome. However, very few studies are available on the role of HOXC10 in gastric carcinoma. Therefore, the aim of this study was to determine the role of HOXC10 in gastric cancer and the potential mechanism underlying its function for cancer biology. Methods： A primary gastric cancer mouse model was obtained via intra-gastric wall injection of gastric cancer cells and was used to evaluate the function of HOXC10 during gastric cancer progression in vivo. Immunohistochemistry was performed to visualize and measure HOXC10 protein expression in gastric cancer tissue. Cells were transfected with plasmids to increase the expression of HOXCIO, and siRNA transfection was performed to suppress HOXC10 expression. Reverse transcription polymerase chain reaction （RT-PCR） and western blotting were utilized to measure mRNA and protein expression, respectively. Proliferation, migration, and invasion were investigated using 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide （MTT） assay, wound healing assay, and matrigel invasion assay in vitro, respectively. Results： HOXC10 expression was significantly increased in gastric cancer tissues compared to matched normal tissues. HOXC10 up-regulation significantly increased tumor volumes in nude mice. Plasmid transfection significantly increased HOXC10 protein and mRNA expressions and effectively promoted cell proliferation. Moreover, HOXC10 up-regulation significantly promoted migration and invasion of gastric cancer cells. Mechanistic investigation showed that HOXC10 up-regulation significantly increased mRNA and protein expression of mitogen-activated protein kinase （MAPK） signaling related genes, including c-myc, c-jun and p53, while also modulating the phosphorylation of c-Jun N-terminal kinase （JNK）, extracellular signal-r

关键词： HOXCIO proliferation metastasis gastric cancer

Synergistic effect of Ni^(Ⅱ)and Co/Fe^(Ⅲ)in doped mixed-valence phosphonate for enhancing electrocatalytic oxygen evolution

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Green Energy & Environment 2022年第3期7卷 432-439页

作者： Juan-Juan hou Jian-Tao Yuan Wei Zhang Ying-Xia Wang xian-Ming Zhang Key Laboratory of Magnetic Molecules and Magnetic Information Materials(Ministry of Education) School of Chemistry and Material ScienceShanxi Normal UniversityLinfen041004China

Metal organophosphonates have been explored in energy-related fields due to their high chemical and thermal stability as a type of uniformly precursor,but only few of pristine metal organophosphonate are directly used for oxygen evolution reaction(OER)***,a mixedvalence iron phosphonate(Fe_(3)-ppat)has been constructed and applied to OER catalysis considered the potential active sites in pillars Fe^(Ⅱ)(-H_(2)O)_(4)(COO)_(2)and inorganic layers Fe^(Ⅲ)(μ_(2)–OH)PO_(3).Specifically,isostructural trimetallic framework Fe_(1.7)Co_(0.3)Ni_(1.0)-ppat possesses a minimum overpotential(291 mV),small Tafel slope(91.65 mV dec^(-1)),and high stability up to 83 *** enhanced catalytic performance could be mainly ascribed to the synergistic effect of Ni^(Ⅱ)equivalent occupancy in pillars and Co/Fe^(Ⅲ)in layers.

关键词： phosphonate stability organo

Differentiable Deformation Graph-Based Neural Non-rigid Registration

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Communications in Mathematics and Statistics 2023年第1期11卷 151-167页

作者： Wanquan Feng Hongrui Cai Junhui hou Bailin deng Juyong Zhang School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026People’s Republic of China School of Data Science University of Science and Technology of ChinaHefei 230026People’s Republic of China Department of Computer Science City University of Hong KongHong KongPeople’s Republic of China School of Computer Science and Informatics Cardiff UniversityCardiffUK

The traditional pipeline for non-rigid registration is to iteratively update the correspondence and alignment such that the transformed source surface aligns well with the target *** the pipeline,the correspondence construction and iterative manner are key to the results,while existing strategies might result in local *** this paper,we adopt the widely used deformation graph-based representation,while replacing some key modules with neural learning-based ***,we design a neural network to predict the correspondence and its reliability confidence rather than the strategies like nearest neighbor search and pair ***,we adopt the GRU-based recurrent network for iterative refinement,which is more robust than the traditional *** model is trained in a self-supervised manner and thus can be used for arbitrary datasets without *** experiments demonstrate that our proposed method outperforms the state-of-the-art methods by a large margin.

关键词： Differentiable deformation graph Non-rigid registration

A Facile Synthesis of α-Phenylthio-α, β-Unsatuated Esters

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Chinese Chemical Letters 2003年第1期14卷 3-5页

作者： Gui Sheng deng Zhi Zhen HUANG xian HUANG Department of Chemistry Zhejiang UniversityHangzhou 310028

a-Phenylthio-a, b-unsaturated esters 6 were synthesized by Witting reaction of 3, which were prepared by a phenylsulfenyllation-trans-ylidation reaction.

关键词： Witting reaction arsonium ylides unsaturated esters synthesis.

Symplectic analysis for elastic wave propagation in two-dimensional cellular structures

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Acta Mechanica Sinica 2010年第5期26卷 711-720页

作者： Xiu-Hui hou Zi-Chen deng Jia-Xi Zhou Tie-Quan Liu Department of Engineering Mechanics Northwestern Polytechnical University Xi'an 710072 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China

On the basis of the finite element analysis, the elastic wave propagation in cellular structures is investigated using the symplectic algorithm. The variation principle is first applied to obtain the dual variables and the wave propagation problem is then transformed into two-dimensional （2D） symplectic eigenvalue problems, where the extended Wittrick-Williams algorithm is used to ensure that no phase propagation eigenvalues are missed during computation. Three typical cellular structures, square, triangle and hexagon, are introduced to illustrate the unique feature of the symplectic algorithm in higher-frequency calculation, which is due to the conserved properties of the structure-preserving symplectic algorithm. On the basis of the dispersion relations and phase constant surface analysis, the band structure is shown to be insensitive to the material type at lower frequencies, however, much more related at higher frequencies. This paper also demonstrates how the boundary conditions adopted in the finite element modeling process and the structures＇ configurations affect the band structures. The hexagonal cells are demonstrated to be more efficient for sound insulation at higher frequencies, while the triangular cells are preferred at lower frequencies. No complete band gaps are observed for the square cells with fixed-end boundary conditions. The analysis of phase constant surfaces guides the design of 2D cellular structures where waves at certain frequencies do not propagate in specified directions. The findings from the present study will provide invaluable guidelines for the future application of cellular structures in sound insulation.

关键词： Cellular structures Symplectic analysis Dispersion relation - Phase constant surface Sound insulation

The effects of sulfide stress cracking on the mechanical properties and intergranular cracking of P110 casing steel in sour environments

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Petroleum Science 2013年第3期10卷 385-394页

作者： hou Duo Zeng Dezhi Shi Taihe Zhang Zhi deng Wenliang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University

Variation and degradation of P-110 casing steel mechanical properties, due to sulfide stress cracking （SSC） in sour environments, was investigated using tensile and impact tests. These tests were carried out on specimens, which were pretreated under the following conditions for 168 hours： temperature, 60 ℃; pressure, 10 MPa; H2S partial pressure, 1 MPa and CO2 partial pressure, 1 MPa; preload stress, 80% of the yield strength （os）; medium, simulated formation water. The reduction in tensile and impact strengths for P-110 casing specimens in corrosive environments were 28% and 54%, respectively. The surface morphology analysis indicated that surface damage and uniform plastic deformation occurred as a result of strain aging. Impact toughness of the casing decreased significantly and intergranular cracking occurred when specimens were maintained at a high stress level of 85% %.

关键词： Acidic solutions high-temperature corrosion hydrogen embrittlement intergranular corrosion sulfide stress cracking