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Macroporous Directed and Interconnected Carbon Architectures Endow Amorphous Silicon Nanodots as Low‑Strain and Fast‑Charging Anode for lithium‑Ion Batteries

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Nano-Micro Letters 2024年第5期16卷 333-351页

作者： zhenwei li Meisheng Han Peilun Yu Junsheng lin Jie Yu Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen Engineering Lab for Supercapacitor MaterialsSchool of Material Science and EngineeringHarbin Institute of TechnologyShenzhenUniversity TownShenzhen 518055People’s Republic of China Songshan Lake Materials Laboratory Dongguan Dongguan 523808GuangdongPeople’s Republic of China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China

Fabricating low-strain and fast-charging silicon-carbon composite anodes is highly desired but remains a huge challenge for lithium-ion ***,we report a unique silicon-carbon composite fabricated by uniformly dis-persing amorphous Si nanodots(SiNDs)in carbon nanospheres(SiNDs/C)that are welded on the wall of the macroporous carbon framework(MPCF)by vertical graphene(VG),labeled as MPCF@VG@SiNDs/*** high dispersity and amor-phous features of ultrasmall SiNDs(~0.7 nm),the flexible and directed electron/li+transport channels of VG,and the MPCF impart the MPCF@VG@SiNDs/C more lithium storage sites,rapid li+transport path,and unique low-strain property during li+***,the MPCF@VG@SiNDs/C exhibits high cycle stability(1301.4 mAh g^(-1) at 1 A g^(-1) after 1000 cycles without apparent decay)and high rate capacity(910.3 mAh g^(-1),20 A g^(-1))in half cells based on industrial electrode *** assembled pouch full cell delivers a high energy density(1694.0 Wh L^(-1);602.8 Wh kg^(-1))and an excellent fast-charging capability(498.5 Wh kg^(-1),charging for 16.8 min at 3 C).This study opens new possibilities for preparing advanced silicon-carbon com-posite anodes for practical applications.

关键词： Amorphous Si nanodots Low-strain Fast-charging lithium-ion batteries

Fingerprinting sediment sources in a typical karst catchment of southwest China

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International Soil and Water Conservation Research 2020年第3期8卷 277-285页

作者： zhenwei li Xianli Xu Yaohua Zhang Kelin Wang Huanjiang Observation and Research Station for Karst Ecosystem Key Laboratory for Agro-Ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangsha410125China University of Chinese Academy of Sciences Beijing100049China

Due to the complex hydrogeological conditions in karst regions,it is difficult to measure sediment source contributions at a catchment scale *** objective of this study was to quantify the relative contributions of sediment sources and their temporal variability in a karst catchment in southwest *** depressions can trap eroded sediment similar to a dam or reservoir and,thus,are representative and typical test beds for identifying sediment sources in karst *** sediment cores were taken from a karst depression,58 soil samples from three potential sediment sources were collected,and 18 soil properties were *** relative contributions of cropland,forestland,and fissure or crack soils were calculated using a multivariate mixing *** fingerprinting results demonstrated that the cropland was the main sediment source in karst ***,according to the mean sediment contributions of the three deposited sediment cores,the sediment contribution from cropland topsoil was 69.3%,varying from 46.9%to 92.3%,and forestland soil and crack soil accounted for 8.6%and 22.1%of the sediment yield,and varying from 2.8%to 16.5%and 4.8%-36.6%,*** result indicated that great attention should be paid when using only a single core to quantify sediment *** to the deposited sediment was generally disturbed as cropland in the karst depression,the area that has not been disturbed in recent decades in depression was more appropriate to trace sediment sources in karst *** the best of our knowledge,this study was the first to quantify the contributions of sediment sources in the karst catchment of southwest *** study provides valuable information and a preliminary reference for applying a composite fingerprinting technique to quantify sediment sources in karst catchments.

关键词： Soil erosion Sedimentation Sediment tracing Earth's critical zone Ecohydrology

Faint Space Debris Detection Algorithm Based on Small Aperture Telescope Detection System

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Research in Astronomy and Astrophysics 2022年第10期22卷 24-38页

作者： Ping Jiang Chengzhi liu Zhe Kang Wenbo Yang zhenwei li Changchun Observatory of National Astronomical Observatories Chinese Academy of SciencesChangchun 130117China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Space Object&Debris Observation PMOCASNanjing 210008China

Ground-based optical observation has unique advantages in space target ***,due to the weak light-gathering ability of small-aperture optoelectronic observation telescopes,the space debris in the image is weak and easily drowned in *** order to solve the above problems,we use digital image processing technology to extract faint space *** propose a high detection rate space debris automatic extraction algorithm,aiming to automatically detect space *** first establish a new space target description *** algorithm is mainly divided into two *** purpose of the first stage is to reduce the influence of a large number of *** perform wavelet transform and guided filtering for three consecutive frames,and the reconstructed wavelet that takes the median value can achieve the effect of eliminating *** the second stage,we adopt the method of robust principal component analysis and attribute the problem of target detection to the problem of separating the target and background of a single frame of *** a large number of experimental results analysis,it is proved that the algorithm can effectively detect faint debris in the monitoring system of small aperture telescope,and has high precision and low computational complexity.

关键词： instrumentation detectors-methods data analysis-methods observational

Highly oxygenated clerodane furanoditerpenoids from the leaves and twigs of Croton yunnanensis

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Chinese Journal of Natural Medicines 2024年第10期22卷 945-954页

作者： WANG Didi MEI Fang NIE Jinchun li zhenwei ZHANG Daidi GUO Dean li Wei School of Pharmacy Guizhou Medical UniversityGuiyang 550025China Zhongshan Institute for Drug Discovery Shanghai Institute of Materia MedicaChinese Academy of SciencesZhongshan 528400China

The phytochemical investigation of the leaves and twigs of Croton yunnanensis resulted in the isolation of eight new clerodane furanoditerpenoids,named croyunfuranoids A-H(1-8),along with three known analogs(9-11).The structures of these compounds were elucidated using spectroscopic analyses,and their absolute configurations were determined through a combination of electronic circular dichroism(ECD)calculations and single-crystal X-ray ***,Croyunfuranoid D(4)is identified as a rare 18,19-dinor-clerodane ***,the structure of a previously reported diterpenoid,crotonyunnan B,was *** isolated compounds were evaluated for their inhibitory activities on nitric oxide(NO)production in LPS-induced RAW 264.7 *** them,compounds 5 and 6 demonstrated significant inhibitory effects,with IC_(50)values of 20.33±2.31 and 22.80±1.31μmol·L^(-1),respectively.

关键词： Croton yunnanensis Euphorbiaceae Clerodane furanoditerpenoid NO inhibitory activity

OsbZIP60-mediated unfolded protein response regulates grain chalkiness in rice

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Journal of Genetics and Genomics 2022年第5期49卷 414-426页

作者： Weiping Yang Pengkun Xu Juncheng Zhang Shuo Zhang zhenwei li Ke Yang Xinyuan Chang Yibo li aNational Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research(Wuhan) Huazhong Agricultural UniversityWuhanHubei 430070China Hubei Hongshan Laboratory WuhanHubei 430070China

Grain chalkiness,an undesirable trait caused by complex factors,has great negative impacts on the quality and economic value of ***,little is known about the regulatory mechanism of grain chalkiness,particularly the effect of endoplasmic reticulum(ER)***,a genome-wide association study(GWAS)reveals that the transcription factor Osb ZIP60 is a vital regulator of rice grain *** analysis demonstrates that knockout of Osb ZIP60 results in extremely high grain chalkiness and aberrant structure of storage ***,the expression of unfolded protein response(UPR)genes,such as OsbZIP50,Os Bi P1,Os Bi P2 and Os Bi P3,is up-regulated in the endosperm cells of osbzip60,and overexpression of all these UPR genes causes various degrees of ***,Osb ZIP60 is found to activate the expression of key genes related to grain chalkiness,such as GPA3,FSE1,FLO7,Chalk5,Os NF-YB1,and Os PK2,whose expression is significantly suppressed in osbzip60 and overexpression lines of Osb ZIP50,Os Bi P1,Os Bi P2,and Os Bi *** study provides novel insights into the function of Osb ZIP60 and the role of the UPR pathway in the formation of grain chalkiness in rice.

关键词： Rice Grain chalkiness GWAS OsbZIP60 OsbZIP50 UPR

Asponchimides A−E: new enantiomeric N-acetyldopamine trimers from Aspongopus chinensis

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Chinese Journal of Natural Medicines 2023年第11期21卷 859-867页

作者： NIE Jinchun MEI Fang ZHENG Yueyuan WEN Qiuyi li zhenwei ZHANG Daidi li Wei GUO Dean School of Pharmaceutical Sciences Southern Medical UniversityGuangzhou 510515China Zhongshan Institute for Drug Discovery Shanghai Institute of Materia MedicaChinese Academy of SciencesZhongshan 528400China

Five new racemic N-acetyldopamine (NADA) trimers, asponchimides A−E ( 1 − 5 ), were isolated from Aspongopus chinensis, a prominent traditional Chinese medicinal insect employed for alleviating pain, treating indigestion, and addressing kidney ailments. Compounds 1 − 5 were successfully resolved by chiral high-performance liquid chromatography (HPLC), yielding five pairs of enantiomers: (+)- and (−)-asponchimides A−E ( 1a / 1b − 5a / 5b ). Their structural identities were discerned by extensive spectroscopic analyses, including high-resolution mass spectrometry (HRMS), ultraviolet-visible (UV-Vis) spectroscopy, infrared (IR) spectroscopy, and nuclear magnetic resonance (NMR), and their absolute configurations were determined by electronic circular dichroism (ECD) calculations. Compounds 1 − 5 are pioneering instances of NADA trimers featuring a Δ7 double bond. When subjected to a series of bioassays, a majority of the compounds exhibited weak inhibitory activity against nitric oxide (NO) production in LPS-induced RAW 264.7 cells.

关键词： Aspongopus chinensis N-acetyldopamine trimer ECD calculations NO inhibitory activity

Small Things Make a Big Difference: the Small-molecule Cross-linker of Robust Water-soluble Network Binders for Stable Si Anodes

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Chemical Research in Chinese Universities 2021年第2期37卷 304-310页

作者： WANG Dong li zhenwei ZHANG Qian liU Jie YANG Yu HAN Jishu WANG Lei State Key Laboratory Base of Eco-chemical Engineering Taishan Scholar Advantage and Characteristic Discipline Team of Eco-chemical Process and TechnologyQingdao University of Science and TechnologyQingdao266042P.R.China College of Chemical Engineering Qingdao University of Science and TechnologyQingdao266042P.R.China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao266042P.R.China Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao266042P.R.China

Silicon(Si)with high theoretical capacity has attracted tremendous attention as the next-generation anode material for li-ion batteries,but the huge expansion during cycling restricts its practical *** a low-cost,accessible robust network binder is a facile and effective approach to suppress the volume change effect and achieve the commercial application of Si *** previous studies focused on the network binder macromolecule main chain,this manuscript pays attention to the study of small-molecule ***,cross-linked network binders using alginate acid and two kinds of cross-linkers,i.e.,D-sorbitol and isosorbide(Alg-DS and Alg-IS binders)are *** was found that not only the chemical structure of the cross-linker but also the physicochemical property,such as melting point affect greatly the mechanical properties of the network *** a result,the Si anode with an Alg-DS binder dried below the melting point of DS shows the best cycling stability with a high capacity of 2249.8 mA·h/g and a retention rate as high as 95.9%after 100 *** study gives a new view to design robust network binders for stable Si anodes.

关键词： li-ion battery Si anode Network binder Cross-linker

Passively Q-switched erbium doped fiber laser using a gold nanostars based saturable absorber

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Photonics Research 2018年第6期6卷 549-553页

作者： ZHE KANG MINGYI liU zhenwei li SIQING li ZHIXU JIA CHENGZHI liU WEIPING QIN GUANSHI QIN Changchun Observatory NAOChinese Academy of Sciences State Key Laboratory on Integrated Optoelectronics College of Electronic Science & EngineeringJilin University

In this paper, we propose and demonstrate an all-fiber passively Q-switched erbium doped fiber laser （EDFL） by using gold nanostars （GNSs） as a saturable absorber （SA） for the first time, to the best of our knowledge. In comparison with other gold nanomorphologies, GNSs have multiple localized surface plasmon resonances, which means that they can be used to construct wideband ultrafast pulse lasers. By inserting the GNS SA into an EDFL cavity pumped by a 980 nm laser diode, a stable passively Q-switched laser at 1564.5 nm was achieved for a threshold pump power of 40 mW. By gradually increasing the pump power from 40 to 120 mW, the pulse duration decreases from 12.8 to 5.3 its and the repetition rate increases from 10 to 17 kHz. Our results indicate that the GNSs are a promising SA for constructing pulse lasers.

关键词： Lasers fiber Lasers Q-switched Nanomaterials Thin films opticalproperties

Scorpion toxin BmKI directly activates Nav1.8 in primary sensory neurons to induce neuronal hyperexcitability in rats

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Protein & Cell 2015年第6期6卷 443-452页

作者： Pin Ye Yunlu Jiao zhenwei li liming Hua Jin Fu Feng Jiang Tong liu Yonghua Ji Laboratory of Neuropharmacology and Neurotoxicology Shanghai University Shanghai 200436 China Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and the Second Affiliated Hospital of Soochow University Institute of Neuroscience Soochow University Suzhou 215021 China

Voltage-gated sodium channels （VGSCs） in primary sensory neurons play a key role in transmitting pain signals to the central nervous system. BmK I, a site-3 sodium channel-specific toxin from scorpion Buthus martensi Karsch, induces pain behaviors in rats. How- ever, the subtypes of VGSCs targeted by BmK I were not entirely clear. We therefore investigated the effects of BmK I on the current amplitude, gating and kinetic properties of Nav1.8, which is associated with neuronal hyperexcitability in DRG neurons. It was found that BmK I dose-dependently increased Nav1.8 current in small- sized （〈25 μm） acutely dissociated DRG neurons, which correlated with its inhibition on both fast and slow in- activation. Moreover, voltage-dependent activation and steady-state inactivation curves of Nay1.8 were shifted in a hyperpolarized direction. Thus, BmK I reduced the threshold of neuronal excitability and increased action potential firing in DRG neurons. In conclusion, our data clearly demonstrated that BmK I modulated Nav1.8 re- markably, suggesting BmK I as a valuable probe for studying Nay1.8. And Navl.8 is an important target re- lated to BmK I-evoked pain.

关键词： voltage-gated sodium channel Nay1.8,primary sensory neurons BmK I