检索结果-南通市图书馆

World Journal of Clinical Cases 2021年第16期9卷 3919-3926页

作者： Shao-Kui Nan Hai-Feng li Dong Zhang Jian-Ning lin li-Sheng hou Department of Orthopedic Surgery The Sixth Medical Center of PLA General HospitalBeijing 100048China

BACKGROUND Open reduction and internal fixation(ORIF)is the traditional surgical treatment for patellar fractures,and unicompartmental knee arthroplasty(UKA),especially Oxford UKA,has been increasingly used in patients with medial knee osteoarthritis(OA).However,the process of choosing treatment for patients with both patellar fractures and anteromedial knee OA remains *** present the case of a patient with a patellar fracture and anteromedial *** SUMMARY We present the case of a 72-year-old woman with a history of bilateral medial compartment OA of the knees and a right Oxford *** also experienced a recent left patellar *** and Oxford UKA were performed in a single *** patient showed excellent postoperative clinical *** ORIF and Oxford UKA can be performed simultaneously for patients with patellar fracture and anteromedial OA on the same knee.

关键词： Patellar fracture Anteromedial osteoarthritis Open reduction and internal fixation Unicompartmental knee arthroplasty Elderly patient Case report

Theoretical Research on the Multi-channel Reaction Mechanism of CHF Radical with HNCO by Density Functional Theory

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2015年第8期34卷 1151-1160页

作者： HAN Yan-Xia KONG Chao hou li-Jie WU Bo-Wan CHEN Dong-Ping GAO li-Guo School of Chemistry & Chemical Engineering Longdong University State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Science School of Chemistry & Chemical Engineering Yulin University

The reaction mechanism of CHF radical with HNCO was investigated by the B3LYP method of density functional theory （DFT）, while the geometries and harmonic vibration frequencies of reactants, intermediates, transition states and products were calculated at the B3LYP/6-311＋＋G＊＊ level. In the temperature range of 100-2600 K, the statistical thermody- namics and Eyring transition state theory with Winger correction were used to study the thermodynamic and kinetic characters of the channel with low energy barrier. In addition, the analysis on the combining interaction between CHF radical and HNCO was performed by atom-in-molecules theory （AIM） and natural bond orbitals （NBO） analysis. The calculation results indicated that the reaction of CHF radical with HNCO had ten channels, and the channel of NH direct extraction （CHF ＋ HNCO→IM6→TS7→IM7→CHFNH ＋ CO） in singlet state was the main channel with low potential energy and high equilibrium constant and reaction rate constant. CHFNH and CO were the main products.

关键词： CHF radical, isocyanic acid, mechanism, equilibrium constant, rate constant

Polyaniline-modified cetyltrimethylammonium bromide- graphene oxide-sulfur nanocomposites with enhanced performance for lithium-sulfur batteries

在线全文

学校读者我要写书评

暂无评论

Nano Research 2014年第9期7卷 1355-1363页

作者： Yongcai Qiu Wanfei li Guizhu li Yuan hou lisha Zhou Hongfei li Meinan liu Fangmin Ye Xiaowei Yang Yuegang Zhang i-LAB Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China

Conductive polymer coatings can boost the power storage capacity of lithiumsulfur batteries. We report here on the design and preparation--by combining a facile and green chemical deposition method with an oxidative polymerization approach--of polyaniline （PANI）-modified cetyltrimethylammonium bromide （CTAB）-graphene oxide （GO）-sulfur （S） nanocomposites with significantly enhanced performance in lithium-sulfur batteries. Such conductive polymer modified CTAB-GO-S nanocomposites as sulfur cathode materials can deliver high specific discharge capacities and long-term cycling performance, i.e., -970 mAh-g-1 at 0.2 C and -715 mAh-g-1 after 300 cycles, -820 mAh.g-1 at 0.5 C and -670 mAh.g-1 after 500 cycles, -770 mAh.K at 1 C and -570 mAh.g-~ after 500 cycles. The capacity decay was as low as 0.036% per cycle at 0.5 C, and 0.051% per cycle at 1 C. Under the same condition, batteries using PANI-modified CTAB-GO-S as cathodes exhibited higher specific capacity and higher average coulombic efficiency compared with CTAB-decorated GO-S and GO--S nano- composites. The improved performance can be attributed to the lower charge transfer resistance and the alleviated dissolution of polysulfides in the PANI- modified CTAB-GO-S cathodes.

关键词： polyaniline graphene oxide-sulfur lithium-sulfur batteries long-term cycling

A Compact Spice Model with Verilog-A for Phase Change Memory

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第1期28卷 212-214页

作者： CAI Dao-lin SONG Zhi-Tang li Xi CHEN hou-Peng CHEN Xiao- Gang State Key Laboratory of Functional Materials for Informatics Laboratory of Nanotechnology Shanghai Institute of Micro-system and Information Technology Chinese Academy of Sciences Shanghai 200050

A compact spice model of the phase change memory with the crystalline fraction as the switching by Verilog-A language is proposed and demonstrated. The model can simulate not only the resistance change by the different electrical pulse, but also the temperature profile and crystalline fraction during programming operation. The simulated resistance as a function of the amplitude of programming voltage pulses is in good agreement with the experimental data.

关键词： Electronics and devices

Complete mitochondrial genome of Ampittia dioscorides （Lepidoptera： Hesperiidae） and its phylogenetic analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Biology 2017年第1期12卷 71-81页

作者： Xin-Min Qin Xiao-Wen Yang li-Xia hou Hui-Min li Guangxi Key Laboratory of Rare and Endangered Animal Ecology College of Life Science Guangxi Normal UniversityGuilin 541004 China

The complete mitochondrial genome of Ampittia dioscorides （Lepidoptera： Hesperiidae） was determined. The sequenced genome is a circular molecule of 15313 bp, containing 13 protein-coding genes （PCGs）, 22 tRNA genes, two rRNA genes, and an A ＋ T-rich region. The gene arrangements and transcribing directions are identical to those in most of the reported lepidopteran mitogenomes. The base composition of the whole genome and genes or regions are also similar to those in other lepidopteran species. All the PCGs are initiated by typical ATN codons; the exception being CO1, which begins with a CGA codon. Eight genes （ND2, ATPase8, ATPase6, COIII, ND5, ND4L, ND6, and Cytb） end with a TAA stop codon, and two genes （ND1 and ND3） end with TAG. The remaining three genes （CO1 and COIl, which end with TA-, and ND4, which ends with T-） have incomplete stop codons. All tRNAs have the typical clover-leaf structure of mitochondrial tRNAs, with the exception of tRNAser（AGY）. On the basis of the concatenated nucleotide and amino acid sequences of the 13 PCGs and wingless gene of 22 butterfly species, maximum parsimony （MP） and Bayesian inference （BI） trees were constructed, respectively. Both MP and BI trees had the same topological structure：（（（（Nymphalidae ＋ Danaidae）＋ Lycaenidae）＋ Pieridae）＋ Papilionidae）＋ Hesperiidae）. The results provide support for Hesperiidae as a superfamily-level taxon.

关键词： Ampittia dioscorides mitochondrial genome phylogeny

Dynamic recrystallization mechanism of as-cast nickel base superalloy N10276 during primary hot working

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第4期30卷 825-837页

作者： Xin-chao Wang Yan Wang Xiao-jie lian Mei Xu li-feng hou Ying-hui Wei College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina State Key Laboratory of Advanced Stainless Steel Materials Taiyuan Iron and Steel(Group)Co.Ltd.Taiyuan 030003ShanxiChina Technology Center Shanxi Taiyuan Stainless Steel Co.Ltd.Taiyuan 030003ShanxiChina

The dynamic recrystallization(DRX)mechanism of as-cast nickel base superalloy N10276 during primary hot working was investigated by compression tests at temperatures of 1000–1200℃ and strain rates between 0.01 and 10 s^(-1).Optical microscopy,scanning electron microscopy,electron backscattered diffraction technique and transmission electron microscopy were used to characterize the evolution of *** higher deformation temperature or lower strain rate,the true stress–true strain curves exhibit the characteristic of a peak stress followed by a steady state flow stress under large strains,confirming the occurrence of *** degree of DRX increases with elevating deformation *** the progress of DRX,low angle grain boundaries gradually decrease,while high angle grain boundaries increase *** studies have shown that discontinuous dynamic recrystallization is the main recrystallization *** there are few original grain boundaries and twin boundaries,and lack of second phase particles for particle stimulated nucleation,geometrically necessary boundaries are formed as supplementary nucleation sites through sub-grain boundary rotation and deformation twin *** annealing twins dominated by Σ3 grain boundaries are generated in large quantities during the growth of recrystallized grains.

关键词： Dynamic recrystallization mechanism As-cast superalloy N10276 Primary hot working Twin

Temporal variations and source apportionment of volatile organic compounds at an urban site in Shijiazhuang, China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第11期32卷 25-34页

作者： Yanan Guan Lei Wang Shujuan Wang Yihao Zhang Jieying Xiao Xiaoli Wang Erhong Duan li'an hou School of Environmental Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China National and Local Joint Engineering Center of Volatile Organic Compounds&Odorous Pollution Control Technology Shijiazhuang 050018China Hebei Province Environmental Monitoring Center Shijiazhuang 050018China Hebei Province Environmental Emergency and Heavy Pollution Weather Warning Center Shijiazhuang 050018China Logistics Science and Technology Research Institute of Rocket Army Beijing 100011China

Shijiazhuang,the city with the worst air quality in China,is suffering from severe ozone pollution in *** the key precursors of ozone generation,it is necessary to control the Volatile Organic Compounds(VOCs)*** have a better understanding of the pollution status and source contribution,the concentrations of 117 ambient VOCs were analyzed from April to August 2018 in an urban site in *** showed that the monthly average concentration of total VOCs was 66.27 ppbv,in which,the oxygenated VOCs(37.89%),alkanes(33.89%),and halogenated hydrocarbons(13.31%)were the main composite *** major sources were identified using Positive Matrix Factorization modeling with an accurate VOCs emission inventory as inter-complementary methods revealed that the petrochemical industry(26.24%),other industrial sources(15.19%),and traffic source(12.24%)were the major sources for ambient VOCs in *** spatial distributions of major industrial activities emissions were identified by using geographic information statistics system,which illustrated the VOCs was mainly from the north and southeast of *** inverse trajectory analysis using Hybrid Single-Particle Lagrangian Integrated Trajectory(HYSPliT)and Potential Source Contribution Function(PSCF)clearly demonstrated the features of pollutant transport to *** findings can provide references for local governments regarding control strategies to reduce VOCs emissions.

关键词： VOCs Source analysis Positive Matrix Factorization(PMF) modeling GIS Inverse trajectory Shijiazhuang

Adipokinetic hormone signaling regulates adult dehydration resistance in the migratory locust

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第9期23卷 3104-3117页

作者： Xianliang Huang Dai Shi Kai Deng Shuzhen Jia Ding Ding li hou Bing Chen College of life Sciences Hebei UniversityBaoding 071002China Hebei Basic Science Center for Biotic Interaction Hebei UniversityBaoding 071002China State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijing 100101China

Drought events have become more severe under climate change,and this can pose a major threat to the survival of various *** molecular mechanisms involved in dehydration resistance are not well ***,adults of the migratory locust,Locusta migratoria,were subjected to food-mediated dehydration,and adipokinetic hormone(AKH)signaling was found to play a key role in regulating dehydration ***,dehydration shortened the lifespan,increased the body weight loss,and reduced the water loss rate in adult *** transcriptome profiles revealed variations in tissue-specific gene expression between dehydration-resistant locusts and normal ***,dehydration selection and exposure induced prominent expression of AKH genes in the retrocerebral complex of adult ***,individual knockdown of AKH1,AKH2,or AKH receptor(AKHR)accelerated water loss and shortened the lifespan of adult locusts under dehydration conditions,and trehalose supplementation ameliorated the negative effects caused by interference with AKH or *** findings demonstrated that AKH/AKHR signaling-dependent trehalose metabolism plays a crucial role in regulating locust dehydration resistance and thus provide novel insights into the regulatory mechanism underlying drought resistance.

关键词： adipokinetic hormone adipokinetic hormone receptor trehalose dehydration resistance Locusta migratoria

Creating Smart Waterworks to Produce Healthy Drinking Water

在线全文

学校读者我要写书评

暂无评论

Engineering 2019年第5期5卷 826-827页

作者： li’an hou School of Environment Beijing Normal UniversityBeijing 100875China

Water is the source of life and *** living standards continue to improve,the public is becoming increasingly concerned about the safety of drinking water,which is closely related to human health[1].The design and operation of public waterworks,which are seen as a key link in ensuring the safety of drinking water,are essential in promoting the healthy development of human life,the economy,and society.

关键词： becoming concerned continue

Effects of High Strain Rate on Properties and Microstructure Evolution of TWIP Steel Subjected to Impact Loading

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2010年第6期17卷 67-73页

作者： li Da-zhao WEI Ying-hui liU Chun-yue hou li-feng liU Dong-feng JIN Xian-zhe College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi China College of Materials Science and Engineering North University of China Taiyuan 030051 Shanxi China Technical Center Taiyuan Iron and Steel (Group) Company LTD Taiyuan 030004 Shanxi China

The mechanical properties of the TWIP steel subjected to impact loading at various strain rates were analyzed by the split Hopkinson pressure bar. Meanwhile the microstructure of the TWIP steel fore-and-aft dynamic deformation was oberseved and analyzed by optical microscope （OM）, X-ray diffraction （XRD）, and transmission electron microscope （TEM）. The results show that when the TWIP steel was deformed under dynamic condition, the stress, microhardness and work hardening rate increase with the increase of strain and strain rate; there is decline of work hardening rate for adiabatic temperature rising softening. There are many pin-like deformation twins in the microstructure of the TWIP steel subjected to impact loading, and the grain size after deformation is bigger than that before; the interaction of twins with dislocation and twins with twins, especially emergence of multiple deformation twins are the main strengthening mechanisms of the TWIP steel. The nucleation mechanism of deformation twins will be ＂rebound mechanism＂;the incomplete deformation twins can be observed when the strain rate is low; when strain rate increases, deformation twins unite together;and deformation twins become denser because the nucleation rate increases with increasing the strain rate.

关键词： TWIP split Hopkinson pressure bar deformation twin strain rate work hardening