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Tautening effect mechanism of titanium-alloy InterTAN nail

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Rare Metals 2023年第12期42卷 4226-4233页

作者： xiang-Sheng gao Sheng-Kai Ma Wang-Ao-Ran chen min Wang qi Pan Zi-yu liu Beijing Key Laboratory of Advanced Manufacturing Technology Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China The Fourth People's Hospital of Jinan Jinan 250031China School of Engineering Medicine Beihang UniversityBeijing 100191China Division of Surgery&Interventional Science University College LondonRoyal National Orthopaedic HospitalLondon HA74LPUK

Although InterTAN(IT)nails are widely employed to treat femoral intertrochanteric fractures,the mechanism behind the tautening effect of titanium-alloy IT nails is not well *** study aimed to reveal the mechanism of this effect.A torque test experiment was conducted,with the torque value recorded and transformed to obtain the tautening ***,theoretical and finite element analyses were performed to further understand the *** influence of age and pitch-difference on the tautening effect was also examined in the study,the results attributed to the pitch-varying integrated interlocking lag *** torque and the corresponding tautening effect drastically increase as the screw is inserted deeper during the second stage,while the torque measured in the first stage is always ***,the tautening force increases with increasing age,this relationship helps evaluate the effect at different *** tautening effect also increases nearly linearly with the pitch difference,which can be adjusted during the IT design stage to select or design IT in engineering practice.

关键词： Tautening effect InterTAN nail Finite element analysis Torque

Pathological Observation of Blood Stasis Syndrome in Non-diabetic Peripheral Neuropathies:A Retrospective Analysis Based on Nerve Biopsy

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Chinese Journal of Integrative Medicine 2020年第10期26卷 776-782页

作者： XU min chen Hai SHI Zai-xiang DA yu-wei LUO yu-min gao li LU Yan WANG min DI li Neurology Department Xuanwu Hospital Capital Medical UniversityBeijing(100053)China Integrative Medicine Department of Cardiology China-Japan Friendship HospitalBeijing(100029)China

Objective To investigate the pathological features of blood stasis syndrome(BSS)in non-diabetic peripheral *** Clinical data of 31 patients with non-diabetic peripheral neuropathy who had undergone nerve biopsy during December 2004 and December 2010 in Xuanwu Hospital Capital Medical University were retrospectively *** to Chinese medicine(CM)syndrome differentiation and signs,26 patients were blood stasis type and 5 patients were non-blood stasis *** and pathological data were compared in *** Clinically,although both groups shared similar symptoms of limb numbness,weakness and sensory disturbances,the prevalence of neuralgia was much grievous in BSS group(73.1%,26/31)compared with the non-BSS group(0%,0/5).As for signs,dermal nutrients disturbance(84.6%,22/26),dark or purple tongue(100.0%,26/26),and sublingual varices(80.7%,21/26)were more common in the BSS group than the non-BSS group(0%,60%,20%,respectively).The prevalence of qi deficiency cases(19/26)in the BSS group was significantly higher compared with the non-BSS group(1/5).The unique histological manifestations of BSS were axonal degeneration(16/26 vs 2/5 in non-BSS group),which was the hallmark of *** with BSS had prominent microangiopathy(61.5%,16/26),manifested as epineurium vasculitis(inflammatory cell infiltrated to the vessel wall,obliteration and recanalization,vascular proliferation,extravascular hemosiderin deposition),angiotelectasis,proliferation and hyaline degeneration of endoneurium *** the BSS group,impaired blood-nerve barrier was indicated by sub-perineurial edema(46.2%,11/26)and endoneurial edema(15.4%,4/26).The Renaut body(15.4%,4/26)and amyloid deposition(3.8%,1/26)found in the BSS group were absent in the non-BSS *** BBS was common in non-diabetic peripheral *** nerves exhibited ischemic alteration of primary axon degeneration and secondary *** interstitial tissue revealed micr

关键词： Chinese medicine blood stasis syndrome non-diabetic peripheral neuropathy biopsy pathologic alteration

Effect of a self-rotating oxygen lance system on mass transfer between slag and molten steel

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Journal of Iron and Steel Research International 2021年第2期28卷 152-159页

作者： qi gao Wei Wu Jian-guo Zhi Bo Zhang xiang-chen li Metallurgical Technology Research Department Central Iron and Steel Research InstituteBeijing 100081China Inner Mongolia Enterprise Key Laboratory of Rare Earth Steel Products Research and Development Baotou 014010Inner MongoliaChina Inner Mongolia Baotou Steel Union Co. Ltd.Baotou 014010Inner MongoliaChina

To improve the efficiency of the steelmaking process,a system of self-rotating lance was designed,and corresponding cold simulation mechanism was *** influence of the self-rotating lance on the mass transfer rate between slag and molten steel was investigated by comparing this novel system with the traditional oxygen *** results show that the self-rotating lance can stably rotate with a gas jet as the power *** mass transfer rate increases with an increase in the top and bottom blow flow rates and with a decline in the lance *** 13.7% of the top blow flow rate is converted to stirring energy,which is approximately twice that of the traditional oxygen lance,and the mass transfer rate can increase by over 30%.Furthermore,the impact energy can be concentrated at different depths of the molten bath by adjusting the rotational *** the same energy density,the mass transfer rate produced by the self-rotating lance is higher;however,the influence of the energy density on the mass transfer rate is low when the rotational speed is 30-50 r/min.

关键词： Self-rotating lance Reaction force Rotational speed Mass transfer rate Impact energy

Knockdown of SIRT2 Rescues YARS-induced Charcot-Marie-Tooth Neuropathy in Drosophila

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Neuroscience Bulletin 2024年第4期40卷 539-543页

作者： Xuedong li Mengrong Wang xiang gao chenyu li Chunyu chen yun qi Ying Wan Wei yu State Key Laboratory of Genetic Engineering School of Life SciencesZhongshan HospitalFudan UniversityShanghai200438China School of Basic Medic Science Southwest Medical UniversityLuzhou64600China Department of Geriatrics Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430030China

Dear Editor,Charcot-Marie-Tooth disease,the most common inherited peripheral neuropathology,is highly heterogeneous among patients and associated with mutations in~100 different genes at an incidence of at least 1:2,500[1].Over 30 mutated genes have been identified in CMT2,which is characterized by peripheral axon degeneration and distal deficits in motor function[2].The aminoacyl-tRNA synthetase is the largest family in CMT2 and includes tyrosyl-tRNA synthetase(YARS,tyrosyl-tRNA synthetase).

关键词： Marie degeneration pathology

A Study of 90°Ferroelectric Domain Structures in PbTiO_(3) Thin Films by Means of Transmission Electron Microscopy

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Chinese Physics Letters 1995年第12期12卷 759-762页

作者： MA Wenhui li qi chen Yanfeng yu Tao SHUN li min Naiben National Laboratory of Solid State Microstructures and Department of Physics Nanjing universityNanjing 210008

PbTiO_(3) thin films prepared by metalorganic chemical vapor deposition method were investigated using a transmission electron *** as-deposited thin films were highly c-axis oriented,90°a-c domains were observed And their crystallographic characteristics were *** of the PbTiO_(3) films was also *** disappearance of 90°domains in the very thin film was found and attributed to surface relaxation effect.

关键词： effect. PbTiO relaxation

Recent advances in Fe-N-C-and Co-N-C-based materials as bifunctional electrocatalysts for oxygen reduction and oxygen evolution

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Science China Chemistry 2024年第4期67卷 1137-1160页

作者： Hui-min Xu Hong-Rui Zhu chen-Jin Huang Zhi-Jie Zhang Ting-yu Shuai qi-Ni Zhan gao-Ren li College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

Fe-nitrogen-carbon(Fe-N-C)-and Co-nitrogen-carbon(Co-N-C)-based electrocatalysts have been widely concerned because of their high OER/ORR activity,low metal cost,and simple *** exploration of Fe-N-C and Co-N-C single atombased catalysts with high activity and stability to overcome the slow kinetics of oxygen reduction and oxygen evolution reactions is also the key to the development of efficient electrolytic water,fuel cells,and rechargeable metal-air ***-N-C and Co-N-C single atom-based electrocatalysts have the advantages of a high utilization rate of metal atoms and high electrocatalytic activity,and are ideal catalysts for promoting electrochemical energy conversion and *** general principles of designing Fe-N-C and Co-N-C single atom-based electrocatalysts are reviewed in this ***,the strategies to improve the bifunctional catalytic activity and stability are ***,the challenges and prospects of Fe-N-C and Co-N-C single atom-based catalysts are well *** review will provide a reference for the directed optimization of Fe-N-C and Co-N-C single atom-based catalysts.

关键词： Fe-N-C Co-N-C single atom bifunctional oxygen electrocatalysts

Assessment of the cropland classifications in four global land cover datasets： A case study of Shaanxi Province, China

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Journal of Integrative Agriculture 2017年第2期16卷 298-311页

作者： chen Xiao-yu liN Ya ZHANG min yu Le li Hao-chuan BAI yu-qi Key Laboratory for Earth System Modelling Ministry of Education/Department of Earth System Science (DESS) Tsinghua University Beijing 100084 P.R. China National Information Center Beijing 100045 P.R. China

Accurate and reliable cropland surface information is of vital importance for agricultural planning and food security monitoring. As several global land cover datasets have been independently released, an inter-comparison of these data products on the classification of cropland is highly needed. This paper presents an assessment of cropland classifications in four global land cover datasets, i.e., moderate resolution imaging spectrometer （MODIS） land cover product, global land cover map of 2009 （GlobCover2009）, finer resolution observation and monitoring of global cropland （FROM-GC） and 30-m global land cover dataset （GlobeLand30）. The temporal coverage of these four datasets are circa 2010. One of the typical agricultur- al regions of China, Shaanxi Province, was selected as the study area. The assessment proceeded from three aspects： accuracy, spatial agreement and absolute area. In accuracy assessment, 506 validation samples, which consist of 168 cropland samples and 338 non-cropland ones, were automatically and systematically selected, and manually interpreted by referencing high-resolution images dated from 2009 to 2011 on Google Earth. The results show that the overall accuracy （OA） of four datasets ranges from 61.26 to 80.63%. GlobeLand30 dataset, with the highest accuracy, is the most accurate dataset for cropland classification. The cropland spatial agreement （mainly located in the plain ecotope of Shaanxi） and the non-cropland spatial agreement （sparsely distributed in the south and middle of Shaanxi） of the four datasets only makes up 33.96% of the whole province. FIROM-GC and GlobeLand30, obtaining the highest spatial agreement index of 62.40%, have the highest degree of spatial consistency. In terms of the absolute area, MODIS underestimates the cropland area, while GlobCover2009 significantly overestimates it. These findings are of value in revealing to which extent and on which aspect that these global land cover datasets may agree with each other at

关键词： land cover cropland classification assessment MODIS GlobCover2009 FROM-GC GlobeLand30

1B Specific LMW-GS Primers Cloned a 1D Located Gene from Wheat Cultivar Xiaoyan 22

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Agricultural Sciences in China 2009年第12期8卷 1419-1428页

作者： yu Xu gao xiang chen qi-jiao WU Dan DONG Jian ZHAO Wan-chun PANG Hong-xi li Zhe-qing College of Agronomy Northwest A&F University Yangling 712100 P.R.China Wheat Engineering Research Center of Shaanxi Province Yangling 712100 P.R. China

In the present study, one unique low-molecular-weight glutenin subunit （LMW-GS） gene. LMWXY22-2 （GenBank no. FJ028810）, was isolated from wheat cultivar Xiaoyan 22 （Triticum aestivum L.） by a pair of genomic specific PCR primers for 1B chromosome. Sequence analysis revealed that LMWXY22-2 was composed of 1 364 bp nucleotides, including a 317 bp promotion region and a 1 047 bp coding region which could be translated into a mature protein of 349 amino acids. In spite of a few minor mutations, the sequence of 5＇ untranslated region （UTR）, the coding region, the deduced N- and Cterminus comparisons indicated that LMWXY22-2 belonged to the reported subunits of LMW-m type and type liI group 5, respectively. Inner gene markers for 1D chromosome together with the phylogenetic analysis revealed that this gene was classified into Glu-D3, which was not in agreement with the I B locus-specific primers for LMW genes completely.

关键词： 1B locus-specific primers gene cloning LMW-GS transferability wheat

Few-layered ReS_2 nanosheets grown on graphene as electrocatalyst for hydrogen evolution reaction

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Rare Metals 2018年第12期37卷 1014-1020页

作者： Han gao Hu-Hu yue Fei qi Bo yu Wan-li Zhang yuan-Fu chen State Key Laboratory of Electronic Thin Films and Integrate Devices Univrsity of Electronic Science and Technology of China School of Optoelectronic Engineering Chongqing University of Posts and Telecommunications

Few-layered ReStwo-dimensional(2 D) semiconductor nanosheets directly nucleated and grown on reduced graphene oxide(RGO) were synthesized through a facile hydrothermal method. Compared with bare ReS, the ReS2/RGO hybrid delivers much better electrocatalytic activity for hydrogen evolution reaction(HER) in acidic media. It exhibits a lower Tafel slope of 107.4 mV decand a larger current density of-5.2 mA·cmat-250 mV(vs. RHE),compared with ReS(152.7 mV·dec,-3.1 mA·cm). The ReS/RGO hybrid has a unique architecture constructed by highly conductive and porous RGO internetworks, which guarantees easy electrolyte infiltration and efficient charge transfer and provides sufficient active edge sites, resulting in enhanced HER performance. The present synthesis approach can be extended to synthesize other 2 D-semiconductor-based composites for energy storage and catalytic devices.

关键词： ReS_2/RGO Hydrothermal method Electrocatalyst Hydrogen evolution reaction