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Lithium-ion cell inconsistency analysis based on three-parameter Weibull probability model

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Rare Metals 2020年第4期39卷 392-401页

作者： Lin-Shu Wang Yan-Yan Fang Ting Zhao jian-tao Wang Hang Zhang Lin Wang Shi-Gang Lu National Power Battery Innovation Center GRINM Group Co.Ltd.Beijing 100088China China Automotive Battery Research Institute Co.Ltd. Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China

The inconsistency of lithium-ion cells degrades battery performance,lifetime and even *** complexity of the cell reaction mechanism causes an irregular asymmetrical distribution of various cell parameters,such as capacity and internal resistance,among *** this study,the Newman electrochemical model was used to simulate the 1 C discharge curves of 100 LiMn2 O4 pouch cells with parameter variations typically produced in manufacturing processes,and the three-parameter Weibull probability model was used to analyze the dispersion and symmetry of the resulting discharge voltage *** results showed that the dispersion of the voltage distribution was related to the rate of decrease in the discharge voltage,and the symmetry was related to the change in the rate of voltage *** effect of the cells’capacity dominated the voltage distribution thermodynamically during discharge,and the phase transformation process significantly skewed the voltage *** effects of the ohmic drop and polarization voltage on the voltage distribution were primarily *** presence of current returned the right-skewed voltage distribution caused by phase transformation to a more symmetrical ***,the Weibull parameters elucidated the electrochemical behavior during the discharge process,and this method can guide the prediction and control of cell inconsistency,as well as detection and control strategies for cell management systems.

关键词： Lithium-ion cell Voltage inconsistency evolution Three-parameter Weibull probability model Dispersion and symmetry of voltage distribution Thermodynamic inconsistency Kinetic inconsistency

Applying the fractional derivative Zener model to fitting the time-dependent material viscoelasticity tested by nanoindentation

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Biosurface and Biotribology 2018年第2期4卷 58-67页

作者： Long Fei Wei Wei Li Zhi Qiang Feng jian tao Liu School of Mechanical Engineering Southwest Jiaotong UniversityChendu 610031People's Republic of China Tribology Res earch Institute Key Laboratory for Advanced Technology of Materials of Ministry of EducationSouthwest Jiaotong UniversityChendu 610031People's Republic of China LMEE-UEVE Universite de Paris-Saclay40 rue du PelvouxEvry 91020France

Material viscoelasticity is of particular importance for polymers,biotissues and many others,due to the significant influence not only on the elastic response of structures,but also on their failure mechanism in actual *** this study,the experimental tests by nanoindentations are cate gorized according to the objective parameter combined with the indenter sha pe into four distinct cases,and the Fractional Derivative Zener model(FDZM)is employed to characterize this time-dependent *** explicit data-fitting formulas are derived to determine the relaxation modulus and creep compliance te sted with the conical and spherical inde ***,a fitting scheme is provided to facilitate the identification of these viscoelastic *** comparison with the general methods adopting the Prony series or empirical models,two silent merits present:(1)fewer model coefficients necessitate being determined based on the experimental data;(2)the relaxation modulus G(t)and the creep compliance J(t)can be obtained through one indentation test,and their exact interconversion is guaranteed as *** sets of experimental data are applied to examine the validity of the developed approach,and three more examples are adopted to demonstrate the exact interconversion between G(t)and J(t).A few concluding remarks are drawn eventually.

关键词： modulus relaxation exact

Phytoene Synthase Gene Cloning from Citrus sinensis Osbeck cv. Cara Cara and Its Prokaryotic Expression

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Agricultural Sciences in China 2008年第2期7卷 148-156页

作者： ZHANG jian-cheng tao Neng-guo TONG Zhu DENG Xiu-xin National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural University Wuhan 430070 RR.China

Using the mRNA from the fruit of Cara Cara as the template, the cDNA of phytoene synthase （PSY） gene was amplified by reverse transcription polymerse chain reaction （RT-PCR）. Sequence analysis indicated that the cDNA was of 1 520 bp, which had an open reading frame of 1 308 bp and encoded a protein of 436 amino acids. The homology analysis showed that PSY of Cara Cara shared high similarities of nucleotides and deduced amino acids with those in other plants up to more than 75 and 70%, respectively. A putative signal transit peptide for plastid targeting was found in the N-terminal region of PSY. The mature forms of PSY included a transmembrane （TM） domain. The recombinant plasmid pET-CitPSY was constructed by subcloning the full coding sequence of PSY cDNA into pET-28 （＋）. After transformation of E. coli BL21 and induced by 1 mmol L^-1 isopropyl-β-D-thiogalacropyranoside （IPTG）, the fusion protein （6× His-PSY） with 52 kD was produced at a high level by prokaryotic expression system. The results of Western blot demonstrated that the fusion protein （6× His-PSY） could be recognized by anti-6 × His monoclonal antibody. The study could establish a basis for molecular improvement of Citrus fruit colors.

关键词： Citrus sinensis Osbeck cv. Cara Cara phytoene synthase prokaryotic expression

Electrochemical preparation of silicon nanowires from porous Ni/SiO2 blocks in molten CaCl2

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Rare Metals 2019年第8期38卷 776-782页

作者： Sheng Fang Han Wang Juan-Yu Yang Shi-Gang Lu Bing Yu jian-tao Wang Chun-Rong Zhao R&D Center for Vehicle Battery and Energy Storage General Research Institute for Nonferrous Metals

Silicon nanowires(SiNWs)with diameter distributions ranging from 80 to 350 nm were prepared by electrochemical reduction of Ni/SiO2 in molten *** effect of the content of nickel additives on the morphology of produced silicon was *** quantities of SiNWs are obtained by the electrochemical reduction of Ni/SiO2 blocks with SiO2 to Ni molar ratio of 20 and *** additives repress the growth of irregular branches and promote longitudinal growth of *** morphologies and surfaces are influenced by the electrolysis *** become thicker with the increase of the electrolysis *** optimum temperature to prepare single crystal SiNWs with high aspect ratio and extraordinary surface quality seems to be 1173 *** amorphous layer of the silicon nanowire is thinner compared to the SiNWs obtained from the pure SiO2 *** produced SiNWs show a photoluminescence emission peak at about 758 nm at room *** work demonstrates the potentiality for the electrochemical reduction process to obtain large quantities of SiNWs with high quality.

关键词： Silicon nanowire Nickel additives SiO2 CaCl2 Electrochemical reduction

Efficient hydrolysis of hemicellulose to furfural by novel superacid SO_4H-functionalized ionic liquids

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Green Energy & Environment 2019年第1期4卷 49-55页

作者： Wei Hui Yan Zhou Yan Dong Zhi-Jun Cao Fei-Qiang He Min-Zhong Cai Duan-jian tao College of Chemistry and Chemical Engineering Institute of Advanced Materials Jiangxi Normal University

Novel superacid SO_4H-functionalized ionic liquids(SFILs) were designed and prepared in this work. The catalytic activities of SFILs were evaluated in xylan hydrolysis and xylose dehydration to produce furfural. Combined with the results of acid strength of SFILs characterized by solid-state ^(31)P MAS NMR, it was found that the catalytic performance of SFILs was positively correlated to their acid strength. The superacid SFIL [Ch-SO_4H][CF_3SO_3] displayed the best catalytic performance with more than 80% yield of furfural, and it was also obviously superior to usual SO_3H-functionalized acidic ILs, mineral liquid acids, and acidic resin Amberlyst-15 catalysts in catalytic activity under optimized conditions. In addition, the superacid SFIL [Ch-SO_4H][CF_3SO_3] could be easily separated from reaction system and reused at least five times without obvious decrease.

关键词： Superacid Ionic liquids Hemicellulose Hydrolysis Furfural

Call for Papers:Special Section on Progress of Analysis Techniques for Domain-Specific Big Data

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Journal of Electronic Science and Technology 2023年第2期21卷 95-96页

作者： Ling Tian jian-Hua tao Bin Zhou University of Electronic Science and Technology of China Tsinghua University National University of Defense Technology

Since the concept of“Big Data”was first introduced in Nature in 2008,it has been widely applied in fields,such as business,healthcare,national defense,education,transportation,and *** the maturity of artificial intelligence technology,big data analysis techniques tailored to various fields have made significant progress,but still face many challenges in terms of data quality,algorithms,and computing power.

关键词： artificial Big computing

Multi-band analysis on physical properties of superconducting FeSe films

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Chinese Physics B 2023年第9期32卷 449-454页

作者：车剑韬叶晨骁 Department of Mathematics and Physics North China Electric Power UniversityBeijing 102206China School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China

The origins of superconductivity and pairing symmetry of order parameters are still controversial problems for FeSe thin films up to *** the Neumann boundary conditions,the electromagnetic properties of this system are investigated using the two-band Ginzburg-Landau *** calculate the temperature dependence of upper critical field in arbitrary direction and critical supercurrent density through the FeSe *** is revealed that the normalized upper critical field is independent of the film thickness and all of our theoretical results are in accordance with the experimental *** thus strongly indicate the existence of two-gap s-wave superconductivity in this material.

关键词： Ginzburg-Landau theory two-band s-wave superconductivity FeSe film

Methotrexate combined with methylprednisolone for the recovery of motor function and differential gene expression in rats with spinal cord injury

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Neural Regeneration Research 2017年第9期12卷 1507-1518页

作者： jian-tao Liu Si Zhang Bing Gu Hua-nan Li Shuo-yu Wang Shui-yin Zhang jiangxi Key Laboratory of Bioprocess Engineering Jiangxi Science & Technology Normal University Department of Spine Surgery Affiliated Hospital of Jiangxi University of Traditional Chinese Medicine

Methylprednisolone is a commonly used drug for the treatment of spinal cord injury, but high doses of methylprednisolone can increase the incidence of infectious diseases. Methotrexate has anti-inflammatory activity and immunosuppressive effects, and can reduce in- flammation after spinal cord injury. To analyze gene expression changes and the molecular mechanism of methotrexate combined with methylprednisolone in the treatment of spinal cord injury, a rat model of spinal cord contusion was prepared using the PinPointTM preci- sion cortical impactor technique. Rats were injected with methylprednisolone 30 mg/kg 30 minutes after injury, and then subcutaneously injected with 0.3 mg/kg methotrexate 1 day after injury, once a day, for 2 weeks. TreadScan gait analysis found that at 4 and 8 weeks after injury, methotrexate combined with methylprednisolone significantly improved hind limb swing time, stride time, minimum longitudinal deviation, instant speed, footprint area and regularity index. Solexa high-throughput sequencing was used to analyze differential gene ex- pression. Compared with methylprednisolone alone, differential expression of 316 genes was detected in injured spinal cord treated with methotrexate and methylprednisolone. The 275 up-regulated genes were mainly related to nerve recovery, anti-oxidative, anti-inflammatory and anti-apoptotic functions, while 41 down-regulated genes were mainly related to proinflammatory and pro-apoptotic functions. These results indicate that methotrexate combined with methylprednisolone exhibited better effects on inhibiting the activity of inflammatory cytokines and enhancing antioxidant and anti-apoptotic effects and thereby produced stronger neuroprotective effects than methotrexate alone. The 316 differentially expressed genes play an important role in the above processes.

关键词： nerve regeneration spinal cord injury methotrexate methylprednisolone gait gene expression profile inflammation oxidative stress apoptosis nerve repair Solexa gene sequencing secondary lesion neural regeneration

Divergent effects of climate change on cropland ecosystem water use efficiency at different elevations in southwestern China

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Journal of Geographical Sciences 2022年第8期32卷 1601-1614页

作者： tao jian ZHU Juntao ZHANG Yangjian DONG Jinwei ZHANG Xianzhou School of Public Administratio n Shand ong Tech no logy and Business UniversityYantai 264005ShandongChina Nagqu Alpine Grassland Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China

Understanding climatic effects on cropland water use efficiency at different elevations is imperative for managing agricultural water and production in response to ongoing climate change in climate-sensitive areas with complex topography, such as southwestern China. We investigated climatic effects on cropland water use efficiency in southwestern China at each 100-m elevation bin during 2001–2017. The maximum water use efficiency was 1.71 gC kg^(–1) H_2O for the 1900–1999 m elevation bin under the growing season temperature and precipitation of 14.58±0.32℃ and 965.40±136.45 mm, respectively. The water use efficiency slopes were dominated by the evapotranspiration slopes at elevations below 1999 m but were controlled by the gross primary productivity slopes at elevations above 2000 m. This difference was caused by the substantial responses of evaporation to climate change at lower elevations and the increased climatic sensitivity of gross primary productivity at higher elevations. In comparison to those at other elevations, croplands at lower elevations were more vulnerable to extreme drought because of the dominant role fluctuating evapotranspiration played in water use efficiency. The findings will improve cropland water management in the study area.

关键词： cropland water use efficiency southwestern China elevational gradient