检索结果-南通市图书馆

In situ analysis of dynamic evolution of the additive-regulated cathode processes in quasi-solid-state lithium-metal batteries

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第10期66卷 2921-2928页

作者： Jian-Xin Tian Hui-Juan Guo Jing wan Gui-Xian liu Rui Wen li-Jun wan CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The implementation of high-energy-density storage devices can be facilitated by the built-in situ cathode electrolyte interphase(CEI)between Ni-rich cathodes and gel polymer electrolytes,as it improves interfacial compatibility and enhances *** the interphase processes of cathode materials,including the structural evolution and the formation of cathode electrolyte interphase upon charging/discharging,is crucial for the design of solid-state lithium ***,we employed in situ atomic force microscopy(AFM)to investigate the effects of lithium difluoro(oxalato)borate(li DFOB)on the dynamic evolution of the cathode *** the presence of li DFOB,the adhesion of nanoparticles and a thin amorphous film on the cathode surface resulted in the formation of a homogeneous CEI,inducing the production of lixPFyas ***,the stable CEI formed between the cathode and electrolyte helps maintain the integrity of the composition and structure,reduces interfacial resistance,and improves the cycle stability of the *** visualization of in situ AFM in quasi-solid-state lithium-metal batteries provides valuable insights into the distinct nanostructures and growth dynamics of li DFOB-mediated CEI on the liNi_(6)Co_(2)Mn_(2)O_(2) cathode,thus offering a universal and convenient technique for interfacial analysis and a mechanistic understanding of solid-state batteries.

关键词： atomic force microscopy electrochemistry interfacial dynamics solid-state lithium batteries cathode electrolyte interphase

同方期刊数据库

Optoeletronic investigation of Cu2ZnSn(S,Se)4 thin-films ＆ Cu2Zn Sn(S,Se)4/CdS interface with scanning probe microscopy

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2016年第2期59卷 231-236页

作者： Jiangjun li Yugang Zou Ting Chen Jinsong Hu Dong wang li-Jun wan Beijing National Laboratory for Molecular Science Key Laboratory of Molecular Nanostructure and Nanotechnology Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

The kesterite-structured semiconductor Cu_2 Zn Sn(S,Se)_4(CZTSSe) is prepared by spin coating a non-hydrazine precursor and annealing at Se atmosphere. Local electrical and optoelectronic properties of the CZTSSe thin-film are explored by Kelvin probe force microscopy and conductive atomic force microscopy. Before and after irradiation, no marked potential bending and very low current flow are observed at GBs, suggesting that GBs behave as a charge recombination site and an obstacle for charge transport. Furthermore, Cd S nano-islands are synthesized via successive ionic layer adsorption and reaction(SILAR) method on the surface of CZTSSe. By comparing the work function and current flow change of CZTSSe and Cd S in dark and under illumination, we demonstrate photo-induced electrons and holes are separated at the interface of p-n junction and transferred in Cd S and CZTSSe, respectively.

关键词： CZTSSe CdS GBs heterojunction KPFM c-AFM

Scheme for N-Qubit Toffoli Gate by Transport of Trapped Ultracold Ions

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第11期50卷 1117-1122页

作者： YANG wan-li WEI Hua CHEN Chang-Yong State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China Department of Physics and Information Engineering Hunan Institute of Humanities Science and Technology Loudi 417000 China

We propose a potentially practical scheme for implementing an n-qubit Toffoli gate by elaborately controllingthe transport of ultracold ions through stationary laser *** on the uniform ionic transport velocity,the n-qubit Toffoli gate can be realized with high fidelity and high successful probability under current experimentalconditions,which depends on a single resonant interaction with n trapped ions and has constant implementation timewith the increase of *** show that the increase of the ion number can improve the fidelity and the successfulprobability of the Toffoli gate.

关键词： Toffoli gate trapped ions

A Perspective on Studying Electronic Structure of Batteries through Soft X-ray Spectroscopy

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2019年第12期38卷 2009-2014页

作者： ZHUO Zeng-Qing PAN Feng YANG wan-li School of Advanced Materials Peking UniversityShenzhen Graduate SchoolShenzhen 518055China Advanced light Source Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeley CA 94720United States

Understanding electronic structure is crucial to enhance the battery performance. Soft X-ray spectroscopy(SXS) is one of the most effective methods to provide direct probe of electronic states. Here, spectroscopic measurements of transition metal 3 d and oxygen 2 p states are simply reviewed. Then, we mainly focus on the perspective of the development direction of modern SXS techniques. Although the true power of recently developed high efficiency mapping of resonant inelastic X-ray scattering(m RIXS) has been apparent for materials and chemistry studies, great challenges remain for mRIXS spectroscopic interpretation, and the understanding of the battery materials on novel redox activities remains elusive.

关键词： electronic structure soft X-ray spectroscopy oxygen redox O-K mRIXS

Uprisings, Migrations, and Ethnic Identity： A Study of the Kaxabu in the Taiwan Borderland during the Qing

在线全文

学校读者我要写书评

暂无评论

Frontiers of History in China 2014年第3期9卷 409-448页

作者： li-wan Hung Institute of Taiwan History Academia Siniea Chinese Taipei

The earliest written record of the term “Kaxabu” dates to the 1908 survey report by the Japanese scholar Ino Kanori. In his study of the Pazzehe tribe in central Taiwan, he wrote： “Kaxabu was the name given by the Pazzehe to Daiyao＇puru, a small division of its ethnic group.” During the Qing era, the Pazzehe was called the Anli group by Chinese speakers in Taiwan, while the Kaxabu were named Puzili she （the Puzili tribe）. Since the Kaxabu originated from the Pazzehe, thus in determining the time when the Kaxabu became distinct from the Pazzehe and in exploring the differences between them, we will also elucidate historical developments before the Japanese colonial era. Using Qing historical materials such as travelogues, expedition-records, newspapers, data from fieldwork, surveys, and interviews, this study traces the intervention of the Qing court into tribal relationships in central Taiwan, beginning with the Dajiaxi she Incident （1731-32）, it touches on the changing environment of the Kaxabu/ Puzili she in their migrations in order to shed light on the development of the two distinctive identities-the Kaxabu and Pazzehe/Anli group. The analysis also reveals the impact of uprisings and migrations upon the border area surrounding Qing Taiwan, as well as problems of ethnic identification and geography.

关键词： statecraft ethnic identity shufan Kaxabu Puzili she migration frontier border

RNA interference-mediated silencing of a Halloween gene spookier affects nymph performance in the small brown planthopper Laodelphax striatellus

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

Insect Science 2015年第2期22卷 191-202页

作者： Shuang Jia Pin-Jun wan li-Tao Zhou li-li Mu Guo-Qing li Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests College of Plant Protection Nanjing AgriculturalUniversity Nanjing China

Post-embryonic development of insects is highly dependent on ecdysteroid hormone 20-hydroxyecdysone. Halloween gene spookier （spok, cyp307a2） has been documented to be involved in ecdysteroidogenesis in Drosophila melanogaster and Bombyx mori. We describe here the cloning and characterization of Halloween gene spookier （Lsspok, Lscyp307a2） in the small brown planthopper Laodelphax striatellus, a hemipteran insect species. LsSPOK has three insect-conserved P450 motifs, that is, Helix-K, PERF motif and heme-binding domain. Temporal and spatial expression patterns of Lsspok were evaluated by quantitative polymerase chain reaction. Through the fouth- instar and the early fifth-instar stages, Lsspok showed two expression peaks in the second- and fifth-day fourth-instar nymphs, and two troughs in the first-day fourth and fifth in- stars. On day 5 of the fourth-instar nymphs, Lsspok clearly had a high transcript level in the thorax where prothoracic glands were located. Dietary introduction of double-stranded RNA of Lsspok in the nymph stage successfully knocked down the target gene, decreased expression level ofecdysone receptor （LsEcR） gene, caused nymphal lethality and delayed development. Ingestion of 20-hydroxyecdysone in Lsspok-dsRNA-exposed nymphs did not increase Lsspok expression level, but almost completely rescued the LsEcR mRNA level and relieved the negative effects on survival and development. Thus, our data suggest that the ecdysteroidogenic pathway is conserved in insects and LsSPOK is responsible for specific steps in ecdysteroidogenesis in L. striatellus.

关键词： development double-stranded RNA ecdysteroidogenesis Laodelphaxstriatellus lethality spookier

Laboratory-scale investigation of the material distribution characteristics of landslide dams in U-shaped valleys

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 Mountain Science 2023年第3期20卷 688-704页

作者： JIAN Fu-xian CAI Zheng-yin GUO wan-li Geotechnical Engineering Department Nanjing Hydraulic Research InstituteNanjing 210024China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing 210024China

Material distribution characteristics during sliding and depositing is particularly significative to investigate the internal structure and spatial variation of landslide dams,which are fundamentally determining the mechanical and hydraulic behavior and the susceptibility to cause dam ***,limited by longevity shortages and special geographic environments,the material distribution characteristics and their formation mechanisms are difficult to observe in the ***,an experimental apparatus modeling a landslide dam was developed in this paper,designing three sampling methods with two valley *** internal deposit characteristics,void ratio variation and relative content of the particle size range(PSR)were analyzed,and the mechanics of deposit structure were also delicately *** results indicate that granular material deposited in valley shows a structure of inverse grain size accumulation in both vertical and horizontal directions,exhibiting spatial variability of particle gradation and void *** characteristic PSR decreases from 22-30 mm in the two-dimensional state to 10-14 mm in the threedimensional *** excitation and vibration sieve are the intrinsic mechanisms of granular flow segregation,intrinsically inducing the formation of inverse grading deposit ***,spatial variability in size is mainly trig gered by segregation,whereas coarse particle content and deposition boundaries merely exacerbate the difference degree.

关键词： Landslide dam IInverse grading structure Granular flow segregation Material spatial variability Deposit characteristics

Influence of propagation direction on operation performance of rotating detonation combustor with turbine guide vane

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第5期17卷 1617-1624页

作者： wan-li Wei Yu-wen Wu Chun-sheng Weng Quan Zheng National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing210094China

Due to the pressure gain combustion characteristics,the rotating detonation combustor(RDC)can enhance thermodynamic cycle ***,the performance of gas-turbine engine can be further improved with this combustion *** the present study,the RDC operation performance with a turbine guide vane(TGV)is experimentally *** and air are used as propellants while hydrogen and air mass flow rate are about 16.1 g/s and 500 g/s and the equivalence ratio is about 1.0.A pre-detonator is used to ignite the ***-frequency dynamic pressure transducers and silicon pressure sensors are employed to measure pressure oscillations and static pressure in the combustion *** experimental results show that the steady propagation of rotating detonation wave(RDW)is observed in the combustion chamber and the mean propagation velocity is above 1650 m/s,reaching over 84%of theoretical Chapman-Jouguet detonation *** and counterclockwise propagation directions of RDW are *** clockwise propagation direction,the static pressure is about 15%higher in the combustor compared with counterclockwise propagation direction,but the RDW dominant frequency is *** the oblique shock wave propagates across the TGV,the pressure oscillations reduces *** addition,as the detonation products flow through the TGV,the static pressure drops up to 32%and 43%for clockwise and counterclockwise propagation process respectively.

关键词： Rotating detonation combustor Propagation direction Turbine guide vane Operation performance

Grotto——Analysis of the Civilization Form of the Image Historiography

在线全文

学校读者我要写书评

暂无评论

学术界 2014年第10期 258-262页

作者： wan li Wei Shaonong School of Design East China Normal University Shanghai 200333

Based on the research achievements of the image historiography by Chen Zhongdan and the study on the Buddhist image historiography,this paper attempts to do some research upon the image of the grotto-shaped temples. As far as the mainstreamBuddhist research is concerned,scholars tend to restore the human morality memory by the historical anthropological methods. As the important heritage of the Buddhist grotto im-ages,the northeastern region of China completely replicates the crowd pattern of the grotto morality system. China plays an important role in the propagation of grotto civilization,and as the image museumand image relic,grotto historiography shall be transformed into image recognition and construct newimage cultural systemso as to further explore the basic model of the morality construction of human beings.

关键词：石窟史学文明图像识别影像道德体系人类学研究成果