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Simultaneously enhanced electrochemical performance and air stability of Ni-rich cathode with a modified washing process

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Rare Metals 2024年第1期43卷 87-97页

作者： ben-Rui hu Ying-Yi Yuan Yu-Cheng Wang Xun-hui Xiong School of Environment and Energy Guangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhou 510640China

Water washing has been regarded as one of the most effective strategies to remove surface residual lithium of nickel-rich layered oxides for lithium-ion batteries(LIBs).However,the loss of lattice lithium during the water washing process deteriorates the electrochemical performances and air stability.Herein,washing the LiNi_(0.90)Co_(0.05)Al_(0.02)O_(2)(NCA) with ammonium dihydrogen phosphate(NH_(4)H_(2)PO_(4)) solution has been proposed to simultaneously enhance electrochemical performances and air stability,in which in-situ generated Li_(3)PO_(4) coating layer on surface of NCA can suppress the loss of lattice lithium.Besides,as a fast ionic conductor,Li_(3)PO_(4) coating layer on NCA can prevent the direct contact with electrolyte/air.As a result,the NH_(4)H_(2)PO_(4) solution washed NCA cathode can deliver a high capacity of131.9 mAh·g^(-1) at 10.0C rate as well as impressive cycle stability with a capacity retention of 83.1% after 100 cycles at 1.0C,much higher than those of water washed NCA(WS-NCA) electrode.After exposed in air for 7 days,the NH_(4)H_(2)PO_(4) solution washed NCA electrode can more effectively maintain the structural integrity as well as the electrochemical performances than water-washed NCA.This work provides a simple and effective approach to enhance the cycle stability and air stability of Nickel-rich cathode materials.

关键词： Layered Ni-rich cathode Residual lithium Li_(3)PO_(4)coating Rate performance Air stability

AIE gel exhibiting continuous gradient fluorescence based on a polar-responsive AIE-gen

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SmartMat 2024年第2期5卷 83-92页

作者： Ziqing hu Hanwei Zhang hui Liu Jinsa Li Xiaofan Ji ben Zhong Tang Key Laboratory of Materials Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Materials Chemistry and Service FailureHubei Engineering Research Center for Biomaterials and Medical Protective MaterialsSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhanChina School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhenGuangdongChina

Traditional multicolor fluorescent hydrogels are generated through the assembly of discrete fluorescent hydrogels,which is not a complete integration much distinct from living organisms.On the basis of aggregation-induced emission(AIE),a special solvent polar-responsive AIE molecule possessing a twisted intramolecular charge transfer(TICT)effect was noticed.By incorporating it into the gel network,an AIE gel that displays continuous gradient fluorescence was fabricated.First,hydrogel A containing the solvent polar-responsive AIE-gen was prepared to show orange fluorescence.After soaking in the organic solvents,the fluorescence color transition of hydrogel A ranging from orange to green occurred when being immersed in high-polarity organic solvents ascribed to the embedded AIE-gen owning TICT effect.Then,hydrogel A was successively lifted up from organic solvents.Due to the different immersion time of each section for the hydrogel,the polarity difference occurred.Then,the produced gel B showed continuous gradient fluorescence ranging from orange to green under the irradiation of UV light.

关键词： aggregation-induced emission fluorescent hydrogel multicolor polar-responsiveness

Theoretical study on the effective thermal conductivity of silica aerogels based on a cross-aligned and cubic pore model

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Chinese Physics B 2024年第6期33卷 28-36页

作者：郑坤灿李震东曹豫通刘犇胡君磊 School of Energy and Environment Inner Mongolia University of Science and TechnologyBaotou 014010China Inner Mongolia Key Laboratory of Efficient and Clean Combustion Baotou 014010China

Aerogel nanoporous materials possess high porosity, high specific surface area, and extremely low density due to their unique nanoscale network structure. Moreover, their effective thermal conductivity is very low, making them a new type of lightweight and highly efficient nanoscale super-insulating material. However, prediction of their effective thermal conductivity is challenging due to their uneven pore size distribution. To investigate the internal heat transfer mechanism of aerogel nanoporous materials, this study constructed a cross-aligned and cubic pore model(CACPM) based on the actual pore arrangement of SiO_(2) aerogel. Based on the established CACPM, the effective thermal conductivity expression for the aerogel was derived by simultaneously considering gas-phase heat conduction, solid-phase heat conduction, and radiative heat transfer. The derived expression was then compared with available experimental data and the Wei structure model. The results indicate that, according to the model established in this study for the derived thermal conductivity formula of silica aerogel, for powdery silica aerogel under the conditions of T = 298 K, a_(2)= 0.85, D_(1)= 90 μm, ρ = 128 kg/m^(3), within the pressure range of 0–10^(5)Pa, the average deviation between the calculated values and experimental values is 10.51%. In the pressure range of 10^(3)–10^(4)Pa, the deviation between calculated values and experimental values is within 4%. Under these conditions, the model has certain reference value in engineering verification. This study also makes a certain contribution to the research of aerogel thermal conductivity heat transfer models and calculation formulae.

关键词： silica aerogel effective thermal conductivity two pore-size structure model porous medium heat transfer

微量元素硒对动物肠道健康的影响及其调控机制

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动物营养学报 2024年第6期36卷 3425-3437页

作者：方满新胡威刘犇宜春学院生命科学与资源环境学院宜春336000 江西绿科农牧科技有限公司宜春336000 江西省高等学校硒农业工程技术研究中心宜春336000

肠道是动物重要的消化、吸收和免疫器官,同时也是机体抵御病原微生物和有害物质的重要防线。硒是维持动物机体健康所必需的微量元素。在畜禽生产中,饲粮添加硒补充剂对于提升畜禽肠道健康具有重要意义。本文综述了近年来不同硒源对畜禽... 详细信息

肠道是动物重要的消化、吸收和免疫器官,同时也是机体抵御病原微生物和有害物质的重要防线。硒是维持动物机体健康所必需的微量元素。在畜禽生产中,饲粮添加硒补充剂对于提升畜禽肠道健康具有重要意义。本文综述了近年来不同硒源对畜禽肠道健康影响调控的研究进展,以期为深入认识和科学使用微量元素硒提供依据参考。

关键词：硒肠道影响作用调控机制

Discovery of novel DNA viruses in small mammals from Kenya

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Virologica Sinica 2022年第4期37卷 491-502页

作者： Griphin Ochieng Ochola Bei Li Vincent Obanda Sheila Ommeh Harold Ochieng Xing-Lou Yang Samson Omondi Onyuok Zheng-Li Shi Bernard Agwanda ben hu CAS Key Laboratory of Special Pathogens and Biosafety Wuhan Institute of VirologyChinese Academy of SciencesWuhan430071China Sino-Africa Joint Research Center Chinese Academy of SciencesWuhan430074China Mammalogy Section National Museums of KenyaNairobi40658-00100Kenya University of Chinese Academy of Sciences Beijing100049China Veterinary Services Department Kenya Wildlife ServiceNairobi40241-00100Kenya Institute of Biotechnology Research Jomo Kenyatta University of Science and TechnologyNairobi62000-00200Kenya

Emergence and re-emergence of infectious diseases of wildlife origin have led pre-emptive pathogen surveillances in animals to be a public health priority.Rodents and shrews are among the most numerically abundant vertebrate taxa and are known as natural hosts of important zoonotic viruses.Many surveillance programs focused more on RNA viruses.In comparison,much less is known about DNA viruses harbored by these small mammals.To fill this knowledge gap,tissue specimens of 232 animals including 226 rodents,five shrews and one hedgehog were collected from 5 counties in Kenya and tested for the presence of DNA viruses belonging to 7 viral families by PCR.Diverse DNA sequences of adenoviruses,adeno-associated viruses,herpesviruses and polyomaviruses were detected.Phylogenetic analyses revealed that most of these viruses showed distinction from previously described viruses and formed new clusters.Furthermore,this is the first report of the discovery and full-length genome characterization of a polyomavirus in Lemniscomys species.This novel polyomavirus,named Ls Py V KY187,has less than 60%amino acid sequence identity to the most related Glis glis polyomavirus 1 and Sciurus carolinensis polyomavirus 1 in both large and small T-antigen proteins and thus can be putatively allocated to a novel species within Betapolyomavirus.Our findings help us better understand the genetic diversity of DNA viruses in rodent and shrew populations in Kenya and provide new insights into the evolution of those DNA viruses in their small mammal reservoirs.It demonstrates the necessity of ongoing pathogen discovery studies targeting rodent-borne viruses in East Africa.

关键词： Kenya DNA viruses Rodents Shrews Polyomavirus

Revolution of vitamin E production by starting from microbial fermented farnesene to isophytol

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The Innovation 2022年第3期3卷 73-79页

作者： Ziling Ye Bin Shi Yanglei huang Tian Ma Zilei Xiang ben hu Zhaolin Kuang Man huang Xiaoying Lin Zhu Tian Zixin Deng Kun Shen Tiangang Liu Key Laboratory of Combinatorial Biosynthesis and Drug Discovery Ministry of Education and School of Pharmaceutical SciencesWuhan UniversityWuhan 430071China J1 Biotech Co. Ltd.Wuhan 430075China

Vitamin E is one of the most widely used vitamins.In the classical commercial synthesis of vitamin E(a-tocopherol),the chemical synthesis of isophytol is the key technical barrier.Here,we establish a new process for isophytol synthesis from microbial fermented farnesene.To achieve an efficient pathway for farnesene production,Saccharomyces cerevisiae was selected as the host strain.First,b-farnesene synthase genes from different sources were screened,and through protein engineering and system metabolic engineering.

关键词： strain synthesis starting

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小檗碱的生物学功能及其在动物生产中的应用

动物营养学报 2024年第1期36卷 12-24页

作者：胡威方满新刘犇樊庆灿宜春学院生命科学与资源环境学院宜春336000 江西绿科农牧科技有限公司宜春336000 江西省高等学校硒农业工程技术研究中心宜春336000

小檗碱(BBR)是一种常见的天然药用植物中提取的五环异喹啉类生物碱,在肠道中可代谢为多种具有生物学功能的产物,可促进肠道结构的损伤修复、改善肠黏膜屏障完整性,同时还可调节肠道菌群结构,提高肠道有益菌丰度,改善肠道内环境;BBR能够... 详细信息

小檗碱(BBR)是一种常见的天然药用植物中提取的五环异喹啉类生物碱,在肠道中可代谢为多种具有生物学功能的产物,可促进肠道结构的损伤修复、改善肠黏膜屏障完整性,同时还可调节肠道菌群结构,提高肠道有益菌丰度,改善肠道内环境;BBR能够通过抑制一些促炎细胞因子的表达来提高机体的免疫力,通过提高抗氧化酶活性、降低丙二醛(MDA)含量、激活腺苷酸活化蛋白激酶(AMPK)信号通路和核因子E2相关因子2(Nrf2)信号通路增强机体的抗氧化能力;BBR可激活核糖体蛋白L5(RPL5)-肿瘤抑制因子53(p53)-鼠双微体2(Mdm2)信号通路诱导细胞发生核仁应激;此外,BBR还可调节脂质代谢,减少脂肪的堆积,保护肝脏等器官组织的正常结构及生理功能。本文就BBR对动物肠道结构、肠道菌群、免疫力、抗氧化和抗凋亡能力、诱导核仁应激等生物学功能及其在家禽、猪、反刍动物及其他动物生产中的应用进行综述,以期为BBR在动物生产中相关研究的开展及作为添加剂合理开发应用提供参考和理论依据。

关键词：小檗碱生物学功能动物生产

Dynamic variations in COVID-19 with the SARS-CoV-2 Omicron variant in Kazakhstan and Pakistan

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Infectious Diseases of Poverty 2023年第2期12卷 115-115页

作者： Qianqian Cui Zhengli Shi Duman Yimamaidi ben hu Zhuo Zhang Muhammad Saqib Ali Zohaib Baikadamova Gulnara Mukhanbetkaliyev Yersyn Zengyun hu Shizhu Li School of Mathematics and Statistics Ningxia University Yinchuan China Chinese Academy of Sciences Key Laboratory of Special Pathogens and Biosafety Wuhan Institute of Virology Chinese Academy of Sciences Wuhan China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Ürümqi China Research Center for Ecology and Environment of Central Asia Chinese Academy of Sciences Ürümqi China University of Chinese Academy of Sciences Beijing China College of Geography and Remote Sensing Sciences Xinjiang University Ürümqi China Department of Clinical Medicine and Surgery Faculty of Veterinary Science University of Agriculture Faisalabad Faisalabad Pakistan Department of Microbiology Faculty of Veterinary and Animal Sciences The Islamia University of Bahawalpur Bahawalpur Pakistan Veterinary Medicine Department Kazakh Agrotechnical University Astana Kazakhstan National Institute of Parasitic Diseases Chinese Centre for Disease Control and Prevention (Chinese Centre for Tropical Diseases Research) NHC Key Laboratory of Parasite and Vector Biology WHO Collaborating Centre for Tropical Diseases National Centre for International Research On Tropical Diseases Shanghai China

Background The ongoing coronavirus disease 2019(COVID-19)pandemic caused by the severe acute respiratory syndrome-coronavirus 2(SARS-CoV-2)and the Omicron variant presents a formidable challenge for control and prevention worldwide,especially for low-and middle-income countries(LMICs).Hence,taking Kazakhstan and Pakistan as examples,this study aims to explore COVID-19 transmission with the Omicron variant at different contact,quarantine and test rates.Methods A disease dynamic model was applied,the population was segmented,and three time stages for Omicron transmission were established:the initial outbreak,a period of stabilization,and a second outbreak.The impact of population contact,quarantine and testing on the disease are analyzed in five scenarios to analysis their impacts on the disease.Four statistical metrics are employed to quantify the model’s performance,including the correlation coefficient(CC),normalized absolute error,normalized root mean square error and distance between indices of simulation and observation(DISO).Results Our model has high performance in simulating COVID-19 transmission in Kazakhstan and Pakistan with high CC values greater than 0.9 and DISO values less than 0.5.Compared with the present measures(baseline),decreasing(increasing)the contact rates or increasing(decreasing)the quarantined rates can reduce(increase)the peak values of daily new cases and forward(delay)the peak value times(decreasing 842 and forward 2 days for Kazakhstan).The impact of the test rates on the disease are weak.When the start time of stage Ⅱ is 6 days,the daily new cases are more than 8 and 5 times the rate for Kazakhstan and Pakistan,respectively(29,573 vs.3259;7398 vs.1108).The impact of the start times of stageⅢon the disease are contradictory to those of stageⅡ.Conclusions For the two LMICs,Kazakhstan and Pakistan,stronger control and prevention measures can be more effective in combating COVID-19.Therefore,to reduce Omicron transmission,strict management of population movement should be employed.Moreo

关键词： COVID-19 Pandemic Omicron Daily new confirmed cases Cumulative confirmed cases Simulation Prediction

赤霉素不同浓度及处理方式对青藏高原柴达木盆地盐爪爪种子萌发的影响

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中国野生植物资源 2024年第5期43卷 63-67,76页

作者：拉本胡娟张旭萍刘强王锦胡笑玫青海师范大学生命科学学院青海西宁810008

目的:探究两种赤霉素处理方式、不同赤霉素浓度对盐爪爪种子萌发指标的影响,旨在得出不同因素对盐爪爪萌发的作用效果,寻求提高盐爪爪萌发的最适条件。方法:采用培养皿纸上萌发法,统计种子萌发情况,计算萌发率、萌发势、萌发指数等指标... 详细信息

目的:探究两种赤霉素处理方式、不同赤霉素浓度对盐爪爪种子萌发指标的影响,旨在得出不同因素对盐爪爪萌发的作用效果,寻求提高盐爪爪萌发的最适条件。方法:采用培养皿纸上萌发法,统计种子萌发情况,计算萌发率、萌发势、萌发指数等指标。结果:(1)在提前浸种组内,随着赤霉素浓度的增加,盐爪爪种子的萌发率、萌发势、萌发指数3项萌发指标也随之增加,但萌发指标小于对照组;(2)在每日滴加组内,赤霉素浓度的变化对盐爪爪种子的萌发不具有显著影响,萌发指标均高于对照组;(3)赤霉素浓度在200~1000 mg/L之间时,每日滴加的处理方式下盐爪爪种子萌发率在92.22%~98.89%之间,提前浸种组处理方式下盐爪爪种子萌发率在56.67%~80.00%之间,前者显著高于后者。结论:(1)在提前浸种组内,低浓度的赤霉素不具有促进盐爪爪种子萌发的作用;(2)在每日滴加组内,200~1000 mg/L的赤霉素对盐爪爪种子的萌发指标均具有促进作用;(3)赤霉素浓度在200~1000 mg/L之间时,每日滴加的方式更适用于盐爪爪种子的萌发。

关键词：赤霉素处理方式盐爪爪种子萌发

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