检索结果-南通市图书馆

Plant Diversity 2024年第4期46卷 435-447页

作者： jun-yi zhang Yue-Hong Cheng Min Liao Yu Feng Sen-Long Jin Ting-Mei He Hai He Bo Xu China-Croatia“Belt and Road”Joint Laboratory on Biodiversity and Ecosystem Services CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan ProvinceChengdu Institute of BiologyChinese Academy of SciencesP.O.Box 416Chengdu 610041SichuanChina College of Life Sciences Chongqing Normal UniversityChongqing 401331China Wolong National Natural Reserve Administration Bureau Wenchuan 623006SichuanChina University of Chinese Academy of Sciences Beijing 100049China

Gastrochilus is an orchid genus containing 73 species of mainly epiphytic on trees or rocks in mountain forests of tropical and subtropical *** phylogenetic analyses and morphological assessments have failed to produce a well-resolved phylogeny at the infrageneric *** the present study,a new infrageneric classification of Gastrochilus is proposed based on thoroughly morphological and phylogenetic analyses based on 52 *** phylogenetic analysis divided the genus into six sections including three new sections,***,*** and *** also reinstate *** to the specific ***,two new species,*** jun ***,***&Yue *** and *** jun ***,***&Yue ***,are described and illustrated.A key to six sections of the genus is presented.

关键词： Gastrochilus Phylogeny Character evolution Taxonomy New species

Performance and enhanced oil recovery efficiency of an acid-resistant polymer microspheres of anti-CO2 channeling in low-permeability reservoirs

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第4期21卷 2420-2432页

作者： Hai-Zhuang Jiang Hong-Bin Yang Ruo-Sheng Pan Zhen-Yu Ren Wan-Li Kang jun-yi zhang Shi-Long Pan Bauyrzhan Sarsenbekuly State Key Laboratory of Deep Oil and Gas China University of Petroleum (East China) School of Petroleum Engineering China University of Petroleum (East China) Oil and Gas Engineering Research Institute School of Energy and Petroleum Industry Kazakh-British Technical University

CO2flooding is a vital development method for enhanced oil recovery in low-permeability reservoirs,However,micro-fractures are developed in low-permeability reservoirs,which are essential oil flow channels but can also cause severe CO2gas channeling ***,anti-gas channeling is a necessary measure to improve the effect of *** kind of anti-gas channeling refers to the plugging of fractures in the deep formation to prevent CO2gas channeling,which is different from the wellbore *** microspheres have the characteristics of controllable deep plugging,which can achieve the profile control of low-permeability fractured *** acidic environments with supercritical CO2,traditional polymer microspheres have poor expandability and plugging *** on previous work,a systematic evaluation of the expansion performance,dispersion rheological properties,stability,deep migration,anti-CO2channeling and enhanced oil recovery ability of a novel acid-resistant polymer microsphere（DCNPM-A） was carried out under CQ oilifield conditions（salinity of85,000 mg/L,80℃,pH=3）.The results show that the DCNPM-A microsphere had a better expansion performance than the traditional microsphere,with a swelling rate of *** microsphere dispersion with a concentration of 0.1%-0.5% had the advantages of low viscosity,high dispersion and good injectability in the low permeability fractured *** the acidic environment of supercritical CO2,DCNPM-A microspheres showed excellent stability and could maintain strength for over 60 d with less *** core experiments,DCNPM-A microspheres exhibited delayed swelling characteristics and could effectively plug deep *** a plugging rate of 95%,the subsequent enhanced oil recovery of CO2flooding could reach 21.03%.The experimental results can provide a theoretical basis for anti-CO2channeling and enhanced oil recovery in low-permeability fractured reservoirs.

关键词： Low-permeability reservoir Anti-CO 2 channeling Polymer microsphere Acid resistance

Rapid Preparation of Monolithic Columns for Capillary Electrochromatography Separation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第6期17卷 813-816页

作者： Wen jun GONG yi jun zhang Yu Ping zhang Seong Ho CHOI Henan Institute of Science and Technology Xinxiang 453003 Department of Chemistry Hannam University Daejon South Korea

Fritless packed silica gel columns were prepared using sol-gel technology, The part of a 75 μm i.d. capillary was filled with a mixture of methacryloxypropyltrimethoxysilane, toluene and hydrochloric acid. Four different photoinitiators such as benzoin methyl ether, Irgacure 819, Irgacure 1700 and Irgacure 1800 were added in the presence or absence of sodium dodecyl sulfate during the polymerization process. The above eight solutions were irradiated at 365 nm about 5-10 min to prepare the porous monolithic sol-gel columns by a one-step process.

关键词： Monolithic columns electrochromatography photopolymerized sol-gel.

Neural Decoding of Visual Information Across Different Neural Recording Modalities and Approaches

在线全文

学校读者我要写书评

暂无评论

Machine Intelligence Research 2022年第5期19卷 350-365页

作者： yi-jun zhang Zhao-Fei Yu Jian.K.Liu Tie-jun Huang Department of Computer Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Computer Science Peking UniversityBeijing 100190China Institute for Artificial Intelligence Peking UniversityBeijing 100190China School of Computing University of LeedsLeeds LS29JTUK Beijing Academy of Artificial Intelligence Beijing 100190Chin

Vision plays a peculiar role in *** information,forming a large part of the sensory information,is fed into the human brain to formulate various types of cognition and behaviours that make humans become intelligent *** advances have led to the development of brain-inspired algorithms and models for machine *** of the key components of these methods is the utilization of the computational principles underlying biological ***,advanced experimental neuroscience techniques have generated different types of neural signals that carry essential visual ***,there is a high demand for mapping out functional models for reading out visual information from neural ***,we briefly review recent progress on this issue with a focus on how machine learning techniques can help in the development of models for contending various types of neural signals,from fine-scale neural spikes and single-cell calcium imaging to coarse-scale electroencephalography(EEG)and functional magnetic resonance imaging recordings of brain signals.

关键词： Neural decoding machine learning deep learning visual decoding brain-inspired vision

Novel Method of Preparation of Monolithic Columns for Fast Separation byγ-Ray Irradiation

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第11期17卷 1485-1488页

作者： Yu Ping zhang Wen jun GONG Li Qun FAN yi jun zhang Kwang Pill LEE Henan Institute of Science and Technology Xinxiang 453003 Department of Chemistry Graduate School Kyungpook National University South Korea

A porous monolithic sol-gel column with the solution of methacryloxypropyltrimethoxysilane in toluene with an acid catalyst was prepared in the presence and absence of sodium dodecyl sulfate. In situ polymerization was carded out by γ-ray irradiation within the capillary. The γ-radiation-initiated synthesis could generate radicals directly on the monomer avoiding use of any initiator. The chromatographic behavior of the capillary monolithic columns were studied in the modes of CEC, p-CEC and low pressure-driven separation, all the tests exhibited reversed-phase character. It provided a viable alternative to either thermally initiated or photo polymerization method for the preparation of monolithic columns.

关键词： Monolithic columns electrochromatography γ-ray irradiation polymerization.

Non-Born-Oppenheimer study of the muonic molecule ion 4Heμ^+

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第4期29卷 226-231页

作者： Hang Yang Meng-Shan Wu yi zhang Ting-Yun Shi Kalman Varga jun-yi zhang State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China Department of Physics and Astronomy Vanderbilt UniversityNashvilleTennessee 37235USA

Accurate non-Born-Oppenheimer variational calculations of all bound states of the positive muon molecular ion 4Heμ^+ have been performed using explicitly correlated Gaussian functions in conjunction with the global *** the energies obtained are accurate in the order of 10-6 Hartree(1 Hartree=27.2114 eV).Compared with the binding energies obtained from calculations based on the Born-Oppenheimer potential with the mass-weighted adiabatic corrections(***.110487(1984)),the largest relative deviation is up to 15%.By analyzing the average interparticle distances and possibility distributions of interparticle distances of this system,it is confirmed that the Born-Oppenheimer approximation is reasonable for this system and that 4Heμ^+ can be regarded as a system of positive muon bound to a slightly distorted helium atom.

关键词： positive muon variational calculation explicitly correlated Gaussian

Accelerating CFD simulation with high order finite difference method on curvilinear coordinates for modern GPU clusters

在线全文

学校读者我要写书评

暂无评论

Advances in Aerodynamics 2022年第1期4卷 115-146页

作者： Chuang-Chao Ye Peng-jun-yi zhang Zhen-Hua Wan Rui Yan De-jun Sun Department of Modern Mechanics University of Science and Technology of ChinaHefeiChina

A high fidelity flow simulation for complex geometries for high Reynolds number(Re)flow is still very challenging,requiring a more powerful HPC ***,the development of HPC with traditional CPU architecture suffers bottlenecks due to its high power consumption and technical *** architecture computation is raised to be a promising solution to the challenges of HPC *** accelerating technology has been utilized in low order scheme CFD solvers on the structured grid and high order scheme solvers on unstructured *** high-order finite difference methods on structured grids possess many advantages,e.g.,high efficiency,robustness,and low ***,the strong dependence among points for a high-order finite difference scheme still limits its application on the GPU *** the present work,we propose a set of hardware-aware technology to optimize data transfer efficiency between CPU and GPU,as well as communication efficiency among *** in-house multi-block structured CFD solver with high order finite difference methods on curvilinear coordinates is ported onto the GPU platform and obtains satisfying performance with a speedup maximum of around 2000x over a single CPU *** work provides an efficient solution to apply GPU computing in CFD simulation with specific high order finite difference methods on current GPU heterogeneous *** test shows that significant accelerating effects can be achieved for different GPUs.

关键词： Hardware-aware High order Finite difference methods Curvilinear coordinates GPU

Heterogeneous engineering of MnSe@NC@ReS_(2) core-shell nanowires for advanced sodium-/potassium-ion batteries

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

Rare Metals 2024年第8期43卷 3713-3723页

作者： Sheng-jun Lu Jin-yi Lin Cai-Hong Wang Yu-Fei zhang yi zhang Hao-Sen Fan College of Materials Science and Metallurgy Engineering Guizhou University Guiyang 550025China School of Energy Science and Engineering Nanjing Tech UniversityNanjing 211816China School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006China

Sodium-ion batteries(SIBs) and potassium-ion batteries(PIBs) have been attracting great attentions and widely been exploited due to the abundant sodium/potassium ***,the preparation of high-powered anode materials for SIBs/PIBs plays a decisive role for the commercial applications of SIBs/PIBs in the *** selenides are a class of potential anode materials for SIBs/PIBs because of their small band gap and high electrical *** this work,MnSe and ReS_(2) core-shell nanowires connecting by polydopamine derived carbon nanotube(MnSe@NC@ReS_(2)) have been successfully synthesized from growing ReS_(2) nanosheets array on the surface of MnSe@NC nano wires,which present excellent Na^(+)/K^(+) storage *** applied as SIBs anode,the specific capacity of 300 mAh·g^(-1) was maintwined after 400 cycles at the current density of 1.0 A·g^(-1).Besides,it could also keep 120 mAh·g^(-1) specific capacity after 900 cycles at 1.0 A·g^(-1) for the anode of *** heterogeneous engineering and one-dimensional-two-dimensional(1D-2D) hybrid strategies could provide an ideal strategy for the synthesis of new hetero-structured anode materials with outstanding battery performance for SIBs and PIBs.

关键词： Heterogeneous engineering Core-shell nanowires MnSe@NC@ReS_(2)nanowires Na^(+)batteries K^(+)batteries

2D multifunctional devices:from material preparation to device fabrication and neuromorphic applications

在线全文

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2024年第3期6卷 91-118页

作者： Zhuohui Huang Yanran Li yi zhang Jiewei Chen jun He Jie Jiang Hunan Key Laboratory of Nanophotonics and Devices School of PhysicsCentral South UniversityChangshaHunanPeople’s Republic of China Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong Special Administrative Region of ChinaPeople’s Republic of China

Neuromorphic computing systems,which mimic the operation of neurons and synapses in the human brain,are seen as an appealing next-generation computing method due to their strong and efficient computing ***-dimensional (2D) materials with dangling bond-free surfaces and atomic-level thicknesses have emerged as promising candidates for neuromorphic computing *** a result,2D neuromorphic devices may provide an ideal platform for developing multifunctional neuromorphic ***,we review the recent neuromorphic devices based on 2D material and their multifunctional *** synthesis and next micro–nano fabrication methods of 2D materials and their heterostructures are first *** recent advances of neuromorphic 2D devices are discussed in detail using different operating *** importantly,we present a review of emerging multifunctional neuromorphic applications,including neuromorphic visual,auditory,tactile,and nociceptive systems based on 2D *** the end,we discuss the problems and methods for 2D neuromorphic device developments in the *** paper will give insights into designing 2D neuromorphic devices and applying them to the future neuromorphic systems.

关键词： 2D material micro–nano fabrication multifunctional system neuromorphic electronics artificial intelligence

DBT-PDP:Provable data possession with outsourced data batch transfer based on blockchain

在线全文

学校读者我要写书评

暂无评论

High-Confidence Computing 2024年第2期4卷 62-72页

作者： Chengming yi Hua zhang Weiming Sun jun Ding State key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China Zhe Jiang Computer Network Emergency Response Technical Team Hangzhou 310052China

In the scenario of large-scale data ownership transactions,existing data integrity auditing schemes are faced with security risks from malicious third-party auditors and are inefficient in both calculation and communication,which greatly affects their *** paper proposes a data integrity audit scheme based on blockchain where data ownership can be traded in batches.A data tag structure which supports data ownership batch transaction is adopted in our *** update process of data tag does not involve the unique information of each data,so that any user can complete ownership transactions of multiple data in a single transaction through a single transaction auxiliary *** the same time,smart contract is introduced into our scheme to perform data integrity audit belongs to third-party auditors,therefore our scheme can free from potential security risks of malicious third-party *** analysis shows that our scheme is proved to be safe under the stochastic prediction model and k-CEIDH *** with similar schemes,the experiment shows that communication overhead and computing time of data ownership transaction in our scheme is ***,the communication overhead and computing time of our scheme is similar to that of similar schemes in data integrity audit.

关键词： Data integrity Cloud outsourcing audit Data ownership batch transaction Blockchain Smart contract