检索结果-南通市图书馆

Chinese Physics Letters 2018年第5期35卷 104-109页

作者： Hui-Xiong Deng zhi-Gang Song Shu-Shen Li su-huai Wei Jun-Wei Luo State Key Laboratory of superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083 University of Chinese Academy of Sciences Beijing 100049 Beijing Academy of Quantum Information Sciences Beijing 100193 Beijing Computational Science Research Center Beijing 100094

Topological phase transition in a single material usually refers to transitions between a trivial band insulator and a topological Dirac phase, and the transition may also occur between different classes of topological Dirac *** is a fundamental challenge to realize quantum transition between Z_2 nontrivial topological insulator（TI） and topological crystalline insulator（TCI） in one material because Z_2 TI and TCI have different requirements on the number of band inversions. The Z_2 TIs must have an odd number of band inversions over all the time-reversal invariant momenta, whereas the newly discovered TCIs, as a distinct class of the topological Dirac materials protected by the underlying crystalline symmetry, owns an even number of band inversions. Taking PbSnTe_2 alloy as an example, here we demonstrate that the atomic-ordering is an effective way to tune the symmetry of the alloy so that we can electrically switch between TCI phase and Z_2 TI phase in a single material. Our results suggest that the atomic-ordering provides a new platform towards the realization of reversibly switching between different topological phases to explore novel applications.

关键词： Cu Te Sn TCI Atomic-Ordering-Induced Quantum Phase Transition between Topological Crystalline Insulator and Z2 Topological Insulator Pb Pt

Quantitative detection of single amino acid polymorphisms by targeted proteomics

在线全文

学校读者我要写书评

暂无评论

Journal of Molecular Cell Biology 2011年第5期3卷 309-315页

作者： zhi-Duan su Liang sun Dan-Xia Yu Rong-Xia Li huai-Xing Li zhi-Jie Yu Quan-Hu Sheng Xu Lin Rong Zeng Jia-Rui Wu Key Laboratory of Systems Biology Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China State Key Laboratory of Molecular Biology Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China Key Laboratory of Nutrition and Metabolism Institute of Nutritional SciencesShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China SIBS-Novo Nordisk Translational Research Centre for PreDiabetes Shanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China Hefei National Laboratory for Physical Sciences at Microscale and School of Life Science University of Science and Technology of ChinaHefei 230026China

Single-nucleotide polymorphisms(SNPs)are recognized as one kind of major genetic variants in population ***,polymorphisms at the proteome level in population scale remain *** the present study,we named amino acid variances derived from SNPs within coding regions as single amino acid polymorphisms(SAPs)at the proteome level,and developed a pipeline of nontargeted and targeted proteomics to identify and quantify SAP peptides in human *** absolute concentrations of three selected SAP-peptide pairs among 290 Asian individuals were measured by selected reaction monitoring(SRM)approach,and their associations with both obesity and diabetes were further *** work revealed that heterozygotes and homozygotes with various SAPs in a population could have different associations with particular *** addition,the SRM approach allows us for the first time to separately measure the absolute concentration of each SAP peptide in the heterozygotes,which also shows different associations with particular traits.

关键词： single amino acid polymorphism(SAP) proteomics selected reaction monitoring(SRM) diabetes obesity

Association of different central venous pressure levels with outcome of living-donor liver transplantation in children under 12 years

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2023年第2期19卷 170-179页

作者： Yi-Chen Fan Xiao-Qiang Wang Dan-Yan Zhu Xiao-Rong huai Wei-Feng Yu Dian-San su zhi-Ying Pan Department of Anesthesiology Shanghai Jiaotong University School of Medicine Affiliated Renji HospitalNo.160 Pujian RoadPudong New DistrictShanghai200127China Nursing Department Shanghai Jiaotong University School of Medicine Affiliated Renji HospitalNo.160 Pujian RoadShanghaiChina

Background Pediatric liver transplantation is an important modality for treating biliary *** overall survival(OS)rate of pediatric liver transplantation has significantly improved compared with that of 20 years ago,but it is still *** anesthesia strategy of maintaining low central venous pressure(CVP)has shown a positive effect on prognosis in adult liver ***,this relationship remains unclear in pediatric liver ***,this study was conducted to review the data of pediatric living-donor liver transplantation to analyze the associations of different CVP levels with the prognosis of *** This was a retrospective study and the patients were divided into two groups according to CVP levels after abdominal closure:low CVP(LCVP)(≤10 cmH2O,n=470)and high CVP(HCVP)(>10 cmH2O,n=242).The primary outcome measured in the study was the overall survival *** secondary outcomes included the duration of mechanical ventilation in the intensive care unit(ICU),length of stay in the ICU,and postoperative stay in the *** demographic and perioperative data were collected and compared between the two ***-Meier curves were constructed to determine the associations of different CVP levels with the survival *** In the study,712 patients,including 470 in the LCVP group and 242 in the HCVP group,were *** propensity score matching,212 pairs remained in the *** LCVP group showed a higher overall survival rate than the HCVP group in the Kaplan-Meier curves and multivariate Cox regression analyses(P=0.018),and the HCVP group had a hazard ratio of 2.445(95%confidence interval,1.163–5.140).Conclusion This study confirmed that a low-CVP level at the end of surgery is associated with improved overall survival and a shorter length of hospital stay.

关键词： Central venous pressure General anesthesia Overall survival rate Pediatric living-donor liver transplantation Prognosis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

大坝安全监控知识库系统研究

水电能源科学 2000年第3期18卷 7-9页

作者：苏怀智吴中如温志萍宋一明河海大学水利水电工程学院江苏南京210098 南京机械高等专科学校江苏南京210098 南水水电厂广东乳源512700

探讨了大坝安全监控知识库系统的设计、知识表示方法的研究、知识获取模型的建立。

关键词：大坝监控知识库管理安全监控系统

Hydraulic experiment on mushroom head in bottom-blown smelting furnace

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2017年第5期24卷 490-494页

作者： Fu-yong su zhi Wen School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China

There are many bottom-blown smelting furnaces in metallurgical industry. When oxygen or air sprays from the jet nozzle into the bottom of the furnace, the melting phase will be frozen and a hemispherical porous zone with a mushroom head shape will be formed around the nozzle. The mushroom head can pro- tect the jet nozzle and mitigate the liquid spray on the surface of melt. In order to analyze the formation process of a mushroom head in the bottom-blown smelting furnaces, a hydraulic experiment system was designed and the formation of the mushroom head was investigated by hydraulic experiment. The hydrau- lic experiment results show that the formation process is mainly divided into generating crushing genera- ting process and stable mushroom head generation process. The formation of stable mushroom head re- quires certain thermodynamic condition and water splash is more intense without a mushroom head than with a mushroom head. The size, porosity and diameter of the mushroom head are affected by the flow rate, temperature and heat capacity of the bottom-blowing gas and the temperature of the superheat and the physical parameters of the melt.

关键词： Bottom-blown smelting furnace Mushroom head Hydraulic experiment Thermal equilibrium Similarity criterion

User story clustering in agile development:a framework and an empirical study

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2023年第6期17卷 43-59页

作者： Bo YANG Xiuyin MA Chunhui WANG Haoran GUO huai LIU zhi JIN School of Information Science and Technology Beijing Forestry UniversityBeijing 100083China Engineering Research Center for Forestry Oriented Intelligent Information Processing National Forestry and Grassland AdministrationBeijing 100083China School of Information Science and Technology North China University of TechnologyBeijing 100144China College of Computer Science and Technology Inner Mongolia Normal UniversityHohhot 010020China Department of Computer Science and Software Engineering Swinburne University of TechnologyHawthorn VIC 3122Australia Key Laboratory of High Confidence Software Technologies(Peking University) Ministry of EducationBeijing 100871China Institute of Software School of Computer SciencePeking UniversityBeijing 100871China

Agile development aims at rapidly developing software while embracing the continuous evolution of user requirements along the whole development *** stories are the primary means of requirements collection and elicitation in the agile development.A project can involve a large amount of user stories,which should be clustered into different groups based on their functionality’s similarity for systematic requirements analysis,effective mapping to developed features,and efficient ***,the current user story clustering is mainly conducted in a manual manner,which is time-consuming and subjective to human *** this paper,we propose a novel approach for clustering the user stories automatically on the basis of natural language ***,the sentence patterns of each component in a user story are first analysed and determined such that the critical structure in the representative tasks can be automatically extracted based on the user story *** similarity of user stories is calculated,which can be used to generate the connected graph as the basis of automatic user story *** evaluate the approach based on thirteen datasets,compared against ten baseline *** results show that our clustering approach has higher accuracy,recall rate and F1-score than these *** is demonstrated that the proposed approach can significantly improve the efficacy of user story clustering and thus enhance the overall performance of agile *** study also highlights promising research directions for more accurate requirements elicitation.

关键词： user story agile development user story mapping clustering

CAVITATION CONTROL BY AERATION AND ITS COMPRESSIBLE CHARACTERISTICS

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2006年第4期18卷 499-504页

作者： DONG zhi-yong su Pei-lan School of Civil Engineering and Architecture Zhejiang University of Technology Hangzhou 310032 China School of Forestry Shanxi Agricultural University Taigu 030801 China

This paper presents an experimental investigation and a theoretical analysis of cavitation control by aeration and its compressible characteristics at the flow velocity V=20m/s-50m/s. Pressure waveforms with and without aeration in cavitation region were measured. The variation of compression ratio with air concentration was described, and the relation between the least air concentration to prevent cavitation erosion and flow velocity proposed based on our experimental study. The experimental results show that aeration remarkably increases the pressure in cavitation region, and the corresponding pressure wave exhibits a compression wave/shock wave. The pressure increase in cavitation region of high-velocity flow with aeration is due to the fact that the compression waves/shock wave after the flow is aerated. The compression ratio increases with air concentration rising. The relation between flow velocity and least air concentration to prevent cavitation erosion follows a semi-cubical parabola. Also, the speed of sound and Mach number of high-velocity aerated flow were analyzed.

关键词： cavitation control by aeration compression wave/shock wave least air concentration speed of sound compression ratio

Organoimido functionalized trinuclear gold(Ⅰ)clusters with fluorescent chromophore

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第6期40卷 1437-1442页

作者： Chun-Lin Lv Chen-huai Yang Li-Ya Liu zhi-Cheng Zhang Key Laboratory of Ethnomedicine(Minzu University of China) Ministry of EducationBeijing 100081China School of Pharmacy and Center on Translational Neuroscience Minzu University of ChinaBeijing 100081China Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Center of Chemical Science and EngineeringTianjin 300072China College of Life and Environmental Sciences Minzu University of ChinaBeijing 100081China

The post-functionalization of gold nanoclusters with organic molecules into organic-inorganic hybrid functional materials is an efficient approach to develop multifunctional *** introducing 1-pyrenamine and 3-aminofluoranthene into[O(AuPPh_(3))_(3)][BF_(4)]with a covalent bond,two novel organoimido functionalized trinuclear gold nanoclusters[C_(16)H_(9)N(AuPPh_(3))_(3)][BF_(4)](Au_(3)-P)and[C_(6)H_(4)-C_(10)H_(5)N(AuPPh_(3))_(3)][BF_(4)](Au_(3)-F)have been successfully *** structures have been determined by electrospray ionization mass spectroscopy(ESI-MS)and single-crystal X-ray diffraction(SC-XRD),and the photoluminescence properties have been investigated from both experimental and theoretical *** is found that the lowest-energy electronic transitions in the ultraviolet-visible(UV-Vis)absorption spectra of Au_(3)-P(403 nm)and Au_(3)-F(425 nm)exhibit a slight bathochromic shift compared to the corresponding transitions in the spectra of 1-pyrenamine and 3-aminofluoranthene,*** addition,the dichloromethane solutions of Au_(3)-P and Au_(3)-F complexes clearly display blue and yellowish-green fluorescence,*** results will help to design and prepare organic-inorganic nanocluster hybrid luminescent materials for potential applications in(bio)sensors,bioimaging and optoelectronic devices.

关键词： Nanoclusters Gold Organoimido Photoluminescence

在线全文

学校读者我要写书评

暂无评论

Editorial

Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 1-2页

作者： su-huai Wei Jingbi You Xudong Yang Beijing Computational Science Research Center Bejing 100193China Institute of Semiconductors Chinese Academy of SciencesBeijing 100190China Shanghai Jiao Tong University Shanghai 200240China

Modern society is becoming more dependent on clean and sustainable energy resources because of growing energy demand caused by population and economic expansion,as well as limited traditional fossil fuels,which can cause significant damage to our *** cell technology,which uses the photovoltaic effect to convert sunlight directly into electricity,has emerged as the most promising renewable energy source because of the infinite abundance of sunlight,low transportation costs,and low *** most cases,the core structure of a solar cell consists of an absorption layer,which uses the photon energy of sunlight to produce electron-hole pairs in a semiconductor,and a p-n junction,which induces a built-in electric field to separate light-generated carriers and creates a flow of electricity when connected to an external circuit.

关键词： infinite connected convert

Numerical Simulation of Sloshing Using the MPS-FSI Method with Large Eddy Simulation

维普期刊数据库更多评论

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2018年第3期32卷 278-287页

作者： YANG Chao ZHANG huai-xin su Hui-lin SHEN Zhong-xiang State Key Laboratory of Ocean Engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai Jiao Tong UniversityShanghai 200240China PLA Army Engineering University Nanjing 210007China School of Naval Architecture and Ocean Engineering Dalian Maritime UniversityDalian 116026China

A numerical model has been developed to study sloshing of turbulent flow in a tank with elastic baffles. The Moving-Particle Semi-implicit method(MPS) is a kind of meshless Lagrangian calculation method. The large eddy simulation(LES) approach is employed to model the turbulence by using the Smagorinsky sub-Particle Scale(SPS)closure model. This paper uses MPS-FSI method with LES to simulate the interaction between free surface flow and a thin elastic baffle in sloshing. Then, the numerical model is validated, and the numerical solution has good agreement with experimental data for sloshing in a tank with elastic baffles. Furthermore, under external excitations,the MPS is applied to viscous laminar flow and turbulent flow, with both the deformation of elastic baffles and the wave height of the free surface are compared with each other. Besides, the impact pressure with/without baffles and wave height of free surface are investigated and discussed in detail. Finally, preliminary simulations are carried out in the damage problem of elastic baffles, taking the advantage of the MPS-FSI method in computations of the fluid–structure interaction with large deformation.

关键词： moving particle semi-implicit method(MPS) fluid–structure interaction(FSI) large eddy simulation(LES) meshless sloshing