检索结果-南通市图书馆

Energy Storage and Saving 2024年第2期3卷 106-152页

作者： Zikuo Liu Shanshan Cai Zhengkai tu Siew Hwa Chan School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan430074China Energy Research Institute Nanyang Technological University637553Singapore

Due to its zero emissions,high efficiency and low noise,proton exchange membrane fuel cell(PEMFC)is full of potential for the application of vehicle power ***,its lifespan and durability remain multiple obstacles to be solved before widespread *** exposure to non-rated operating conditions could considerably accelerate the degradation of the PEMFC in various forms,thus reducing its *** paper first analyzes degradation mechanisms of PEMFCs under typical automotive operating conditions,including idling,startup-shutdown,dynamic loads,and cold *** corresponding accelerated stress testing methods are also ***,as the impurities existed in the reaction gas source and generated from the degradation of the PEMFC itself may occur under all automotive conditions,the degradation mechanisms caused by impurity contamination are classified and reviewed in *** that,the techniques proposed by researchers to enhance the durability of PEMFCs are presented from four aspects:membrane electrode assembly materials,bipolar plates and flow fields design,stack assembly,and cell control *** challenges in the field and the prospects for the future are summarized and analyzed at the *** aim of this work is to provide guidelines for improving the durability of PEMFCs in vehicle applications.

关键词： Proton exchange membrane fuel cell Vehicle Automotive operating conditions Degradation Durability

Rapid Simultaneous Determination of Four Ganoderic Acids in Ganoderma(Chinese Name:Lingzhi)by Direct Infusion-Multiple Reaction Monitoring Cubed

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

Journal of Analysis and Testing 2024年第1期8卷 52-62页

作者： Nian wu Bo Peng Ting Li Pengfei tu Shengpeng wang Bo Li wenjing Liu Yuelin Song Modern Research Center for Traditional Chinese Medicine Beijing Research Institute of Chinese MedicineBeijing University of Chinese MedicineBeijing 100029China Amway(China)Botanical Research Center Wuxi 214011China State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoTaipa 999078China Amway(Shanghai)Innovation&Science Co. LtdShanghai 201508China School of Pharmacy Henan University of Chinese MedicineZhengzhou 450046China

Attributing to the rapid demand expansion for the edible medicinal materials in the market,the limited throughput of highperformance liquid chromatography-multiple reaction monitoring(HPLC-MRM)cannot fully address the measurement workload for a huge number of testing ***,it is urgent to pursue more efficient approaches for the quality *** of the greater selectivity of MRM cubed(MRM^(3))over MRM,there might be a chance to omit the time-intensive LC *** current study,we attempted to develop a direct infusion(DI)-MRM^(3) program,and the applicability was thereafter assessed through simultaneous determination of four ganoderic acids(GAs)in one of the most famous tonic herbal medicines namely Ganoderma(Chinese name:Lingzhi).Primary parameters such as Q1>Q3>QLIT ion transitions,collision energy(CE),and excitation energy were optimized by programming online energy-resolved mass spectrometry with authentic compounds.A single DI-MRM measurement merely costed four minutes,and in spite of the wide occurrences of isomers,satisfactory selectivity was *** validation assays demonstrated the method to be sensitive,precise,accurate,and *** quantitative results from DI-MRM^(3) were also justified by conducting LC-MRM measurements in *** differences occurred for the content patterns between the two original sources namely Ganoderma lucidum and ***,and,moreover,either cultivar or harvest time showed dramatical influence on the quantitative features of the four targeted *** importantly,DI-MRM3 is a meaningful analytical option for rapid quantitative analysis of herbal medicines,because of the comparable reliability,nonetheless,less consumptions of both measurement time and solvent,compared with LC-MRM.

关键词： Direct infusion Multiple reaction monitoring cubed High-throughput quantitative analysis Ganoderic acids Ganoderma

An Assembly of Pyrano[3,2-b]indol-2-ones via NHC-Catalyzed[3+3]Annulation of Indolin-3-ones with Ynals

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2024年第13期42卷 1487-1492页

作者： Xia wang Shulei Zhang Shao-Jie wang Hao An Xiaolan Xin Haonan Lin Zhifeng tu Shenci Lu Frontiers Science Center for Flexible Electronics(FSCFE) Shaanxi Institute of Flexible Electronics(SIFE)&Shaanxi Instituteof Biomedical Materials and Engineering(SiBME)Northwestern Polytechnical University(NPU)127 West Youyi RoadXi'anShaanxi 710072China School of Chemistry and Chemical Engineering Northwestern Polytechnical University(NPU)127 West Youyi RoadXi'anShaanxi 710072China

we report herein an unprecedented N-heterocyclic carbene-catalyzed formal[3+3]annulation of ynals with N-Ts indolin-3-ones under the oxidation condition affording the functionalized pyrano[3,2-b]*** alkynyl acylazoliums via the combination of a carbene with ynals in the presence of oxidate proved to be the important intermediates for the success of this *** method features a broad substrate scope and mild conditions,including axially chiral skeletons with suitable substitutions.

关键词： N-Heterocyclic carbene Annulation Organocatalysis Atropisomerism Carbazole Aldehydes Heterocycles Asymmetric catalysis

Accurate Quantification of Pure Thiacloprid with Mass Balance and Quantitative H-NMR

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

Journal of Analysis and Testing 2024年第1期8卷 1-8页

作者： Mengling tu wei Zhang Yunxiao Zhu wen Ma Xiao Li Shukun Zhou Hongmei Li Xianjiang Li Key Laboratory of Chemical Metrology and Applications on Nutrition and Health for State Market Regulation Division of Metrology in ChemistryNational Institute of MetrologyBeijing 100029China State Key Laboratory of Heavy Oil Processing College of Chemical Engineering and EnvironmentChina University of PetroleumBeijing 102249China State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China

Thiacloprid is the first-generation neonicotinoid insecticide,which is widely used in modern *** materials are essential for sound measurement and traceability of results in chemical *** thiacloprid was comprehensively assessed by two orthonormal methods:mass balance(MB) and quantitative nuclear magnetic resonance spectroscopy(qNMR).From MB,its mass fraction value was 998.4 mg/g with the subtraction of structurally related impurities(99.87%),inorganic impurities(0.006 mg/g),water(0.33 mg/g),and volatile organic solvent(0 mg/g).To guarantee sufficient separation of structurally related purity,peak purity of thiacloprid was evaluated by five points of UV *** the qNMR of hydrogen,its mass fraction value was 995.7 mg/g which was traced to the internal standard(methyl sulfone).Finally,the certified value was assigned to 997 mg/g,together with an expanded uncertainty of 3 mg/g(k=2).This high-purity thiacloprid can be applied to routine monitoring in agriculture and the food fields.

关键词： Mass balance Quantitative nuclear magnetic resonance spectroscopy Reference material Thiacloprid

A versatile humanoid robot platform for dexterous manipulation and human-robot collaboration

在线全文

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2024年第2期9卷 526-540页

作者： Xin Shu Fenglei Ni Xinyang Fan Shuai Yang Changyuan Liu Baoxu tu Yiwei Liu Hong Liu State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbinChina

Humanoid robots have attracted much attention by virtue of their compatibility with human ***,biped humanoids with immense promise still cannot function steadily and reliably in real-world settings in the current ***,rationally combining a humanoid robot with different stable mobile platforms is a favoured solution for diverse ***,a new versatile humanoid robot platform,aiming to provide a generic solution that can be flexibly deployed in diverse scenarios,for example,indoors and fields is *** humanoid robot platform incorporates multimodal perception,and extensible interfaces on hardware and software,allowing it to be rapidly integrated with different mobile platforms and end-effectors,only through easyto-assemble ***,the platform has achieved impressive integration,lightness,dexterity,and strength in its class,with human-like size and rich perception,targeted to have human-intelligent manipulation skills for human-engineered ***,this article elaborates on the reasoning behind the design choices,and outlines each ***,the essential performance of the platform is successfully demonstrated in a set of experiments with precise and dexterous manipulation,and human–robot collaboration requirements.

关键词： intelligent robots robotics

Using proteomics to compare the molecular structures of sulfide and permeate-depilated sheepskins

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

Collagen and Leather 2024年第1期6卷 70-84页

作者： Yi-Hsuan tu Trevor S.Loo Mark L.Patchett Gillian E.Norris School of Natural Sciences Massey UniversityPalmerston NorthNew Zealand

An environmentally friendly method using real or artificial bovine milk permeate to both depilate and preserve sheepskins has been reported which completely and cleanly removed the wool from the hair follicle and had no detrimental effects on the skin.A proteomic analysis,assessing the relative abundance of proteins in matched permeate-depilated and chemically depilated(sulfide)sheepskins,showed variations in the levels of specific collagen types in the skin's basement membrane and other proteins associated with the *** findings were corroborated by biochemical analyses of matched permeate depilated and raw skin samples,and provide clues to the mechanism of non-invasiveand complete *** also support the observation that permeate-depilated skins were smoother than their sulfide-depilated counterparts and resulted in leather with a superior surface.

关键词： Collagen Collagen crosslinks Glycosaminoglycan Proteomics Relative abundance

Adhesion property of AlCrNbSiTi high-entropy alloy coating on zirconium:experimental and theoretical studies

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第8期35卷 79-91页

作者： Bao‑Liang Zhang wen‑Guan Liu Meng‑He tu Can Fang Yan Liu Yu‑Hui wang Yong Hu Hui wang China Institute of Atomic Energy Beijing 102413China Sino‑French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China

Experimental scratch tests and first-principles calculations were used to investigate the adhesion property of AlCrNbSiTi high-entropy alloy(HEA)coatings on zirconium *** HEA and Cr coatings were deposited on Zr alloy substrates using multi-arc ion plating technology,and scratch tests were subsequently conducted to estimate the adhesion property of the *** results indicated that Cr coatings had better adhesion strength than HEA coatings,and the HEA coatings showed *** special quasi-random structure approach was used to build HEA models,and Cr/Zr and HEA/Zr interface models were employed to investigate the cohesion between the coatings and Zr substrate using first-principles *** calculated interface energies showed that the cohesion between the Cr coating and the Zr substrate was stronger than that of the HEA coating with *** contrary to Al or Si in the HEA coating,Cr,Nb,and Ti atoms binded strongly with Zr *** on the calculated elastic constants,it was found that low Cr and high Al content decreased the mechanical performances of HEA ***,this study demonstrated the utilization of a combined approach involving first-principles calculations and experimental studies for future HEA coating development.

关键词： High-entropy alloy coating Cr coating Adhesion property Scratch test First-principles calculation

Catecholaminergic neurons orchestrate fasting-induced immune harmony

在线全文

学校读者我要写书评

暂无评论

Biophysics Reports 2024年第1期10卷 57-59页

作者： Mengdi Guo weiyan wang Xiao tu Meiling Jiang Cun-Jin Zhang Department of Neurology Sichuan Provincial People's Hospital University of Electronic Science and Technology of China Department of Science and Technology Sichuan Provincial People's Hospital University of Electronic Science and Technology of China

Dietary fasting is a well-established intervention for immunosuppressive therapy, but the underlying mechanism remains elusive. Host fitness to nutritional stress has been confirmed to initiate a cascade of adaptive responses mediated by the central nervous system, shedding new light on a neural link between fasting and immunity(de Cabo and Mattson 2019).

关键词：

Thioredoxin pathway regulated live-cell synthesis of CdSe quantum dots in Saccharomyces cerevisiae

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第11期67卷 3851-3860页

作者： Xu Li Cai-Qin wu Jia-wei tu Juan Kong Ling-Ling Yang Zhi-Xiong Xie Dai-wen Pang College of Chemistry and Molecular Sciences The Institute for Advanced Studies College of Life Sciences Wuhan University Research Center for Analytical Sciences College of Chemistry State Key Laboratory of Medicinal Chemical Biology Tianjin Key Laboratory of Biosensing and Molecular Recognition Frontiers Science Center for New Organic Matter Frontiers Science Center for Cell Responses and Haihe Laboratory of Sustainable Chemical Transformations Nankai University

Currently, the application of synthetic biology to artificially manipulate and utilize organisms for the synthesis of desired products such as nanomaterials with excellent fluorescence properties is attracting considerable attention. However, it is still difficult to obtain designed products efficiently due to insufficient knowledge of the biosynthetic mechanisms. The thioredoxin（TRX） and glutathione（GSH） pathways are generally conserved thiol-reductase systems that protect organisms from oxidative stress and are involved in selenium（Se） metabolism. In this study, we revealed the pivotal role of cytoplasmic TRX pathway in regulating the metabolism of Na2SeO3during the live-cell synthesis of cadmium-selenium quantum dots（Cd Se QDs） in Saccharomyces cerevisiae by regulating the expression level of genes related to TRX pathway and measuring the intracellular content of selenocysteine（Se Cys）. The determination of Se Cys metabolism in yeast with GSH pathway-related genes deleted demonstrated that the TRX pathway played a more significant role in Se Cys metabolism than GSH pathway. A 6.4-fold enhancement in the synthetic yield of Cd Se QDs was achieved through the overexpression of TRX pathway-related genes,improvement of synthetic procedure, and supplementation of GSH based on the understanding of biological *** the mechanism of CdSe QDs live-cell synthesis facilitates the precise manipulation of biological processes for the synthesis of inorganic nanomaterials.

关键词： thioredoxin glutathione quantum dot live-cell synthesis selenium metabolism Saccharomyces cerevisiae

The biochemical behavior and mechanism of uranium(Ⅵ)bioreduction induced by natural Bacillus thuringiensis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第2期136卷 372-381页

作者： Shunzhang Chen Junyuan Gong Yanxia Cheng Yuqi Guo Feize Li tu Lan Yuanyou Yang Jijun Yang Ning Liu Jiali Liao Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China

For a broader understanding of uranium migration affected by microorganisms in natural anaerobic environment,the bioreduction of uranium(Ⅵ)(U(Ⅵ))was revealed in Bacillus thuringiensis,a dominant bacterium strain with potential of uranium-tolerant isolated from uranium contaminated *** reduction behavior was systematically investigated by the quantitative analysis of U(Ⅳ)in bacteria,and mechanism was inferred from the pathway of electron *** anaerobic conditions,appropriate biomass and sodium lactate as electron donor,reduction behavior of U(Ⅵ)induced by *** was restricted by the activity of lactate dehydrogenase,which was directly affected by the initial pH,temperature and initial U(Ⅵ)concentration of bioreduction *** of U(Ⅵ)was driven by the generation of nicotinamide adenine dinucleotide(NADH)from enzymatic reaction of sodium lactate with various *** transmission of the electrons from bacteria to U(Ⅵ)was mainly supported by the intracellular NADH dehydrogenase-ubiquinone system,this process could maintain the biological activity of cells.

关键词： Uranium Bacillus thuringiensis Bioreduction Electron transmission