检索结果-南通市图书馆

Rare Metals 2016年第2期35卷 177-183页

作者： Yu-Hao Zhai Yu-Juan zhang Yi Peng sheng-mao zhang Ping-Yu zhang Xiao-Min zhang Key Laboratory of Ministry of Education for Special Functional Materials Henan University College of Materials and Mineral Resources Xi’an University of Architecture and Technology

nc-Ti C/a-C：H nanocomposite films were prepared by filtered cathodic arc technique. The influence of C_2H_2/Ar flow ratio on the composition, structure, and mechanical properties of films was investigated by X-ray photoelectron spectroscopy（XPS）, X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FTIR）,Raman spectroscopy, nanoindentation, and ball-on-disc tribometry. The films show a nanocomposite structure in which Ti C crystallites are embedded in the amorphous matrix of a-C：H phase. C content in films increases with the flow ratio of C_2H_2/Ar, simultaneously, the crystallite size of TiC decreases. Contrary to the nc-Ti C/a-C：H films deposited by magnetron sputtering in which the sp3 C content increases with C_2H_2 flow rate, the increase of C_2H_2 flow rate leads to the increase of sp2 C content in films deposited by filtered cathodic arc technique. The nc-Ti C/a-C：H films deposited by cathodic arc technique have a pronounced hardness maximum of 30 GPa under the C_2H_2/Ar flow ratio of 12. Tribological performance of films is controlled by the sp2 content in films. Higher sp2 content promotes the formation of graphite-like transfer layer during sliding,and results in lower wear rate and friction coefficient.

关键词： Nanocomposite films Tribological performance Hardness

Two new neolignans from Gymnotheca involucrata

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2017年第5期28卷 1049-1051页

作者： Shi-Ji Xiao mao-sheng zhang Da-Le Guo Fang Chen Yan Zhou Li-sheng Ding School of Pharmacy Zunyi Medical University Chengdu Institute of Biology Chinese Academy of Sciences College of Life Science Sichuan University

Two new biphenyl butyl neolignan derivatives,named gymnothebutyllignans A（1） and B（2）,were isolated from the whole parts of endemic medicinal plant of Gymnotheca involucrata（Saururaceae）.The structures of the new compounds were elucidated by extensive NMR and MS data,and the absolutely configuration of compound 1 was confirmed by X-ray crystal diffraction analysis.

关键词： Gymnotheca involucrata Saururaceae Neolignan Gymnothebutyllignan Absolutely configuration

Two novel 2,5-diphenyl oxazole derivatives from Gymnotheca chinensis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2016年第7期27卷 1064-1066页

作者： Shi-Ji Xiao Da-Le Guo mao-sheng zhang Shu-Ling Peng Fang Chen Yan Zhou Li-sheng Ding School of Pharmacy Zunyi Medical University Chengdu Institute of Biology Chinese Academy of Sciences College of Life Science Sichuan University

Two novel 2,5-diphenyl oxazole derivatives,named gymnothecaoxazoles A（1） and B（2）,were isolated from the whole parts of endemic medicinal plant of Gymnotheca chinensis（Saururaceae）.The structures of the new compounds were elucidated by extensive NMR and MS data,and the structure of compound 1was further confirmed by X-ray crystal diffraction analysis.

关键词： Gymnotheca chinensis Saururaceae 2,5-Diphenyl oxazole Alkaloid Gymnothecaoxazole

Unbalanced private set intersection with linear communication complexity

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第3期67卷 79-93页

作者： Quanyu ZHAO Bingbing JIANG Yuan zhang Heng WANG Yunlong mao sheng ZHONG Department of Computer Science and Technology Nanjing University Purple Mountain Lab

The private set intersection(PSI) protocol allows two parties holding a set of integers to compute the intersection of their sets without revealing any additional information to each other. The unbalanced PSI schemes consider a specific setting where a client holds a small set of the size n and a server holds a much larger set of the size m(n ■ m). The communication overhead of state-of-the-art balanced PSI schemes is O(m + n) and the unbalanced PSI schemes are O(nlogm). In this paper, we propose a novel secure unbalanced PSI protocol based on a hash proof system. The communication complexity of our protocol grows only linearly with the size of the small set. In other words, our protocol achieves communication overhead of O(n). We test the performance on a personal computer(PC) machine with a local area network(LAN)setting for the network. The experimental results demonstrate that the client only takes 2.01 s of online computation, 4.27 MB of round trip communication to intersect 1600 pieces of 32-bit integers with 220pieces of 32-bit integers with the security parameter λ = 512. Our protocol is efficient and can be applied to resource-constrained devices, such as cell phones.

关键词： unbalanced private set intersection Hash proof system linear communication complexity small set resource-constrained devices

Evaluation of urban underground space resources using a negative list method: Taking Xi'an City as an example in China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Geology 2020年第1期3卷 124-136页

作者： mao-sheng zhang Hua-qi Wang Ying Dong Lin Li Ping-ping Sun Ge zhang Shaanxi Province Engineering Research Centre of Water Resources and Environment Xi'an Center of China Geological SurveyMinistry of Natural ResourcesXi'an 710054China

Utilization of urban underground space has become a vital approach to alleviate the strain on urban land resources,and to optimize the structure and pattem of the *** is also very important to improve the city environment,build livable city and increase the capacity of the *** on the analysis of existing evaluation methods and their problems,a method for evaluating underground space resources based on a negative list of adverse factors affecting underground space development is proposed,to be primarily used in urban planning stages.A list of the adverse factors is established,including limiting factors,constraining factors and influencing *** Xi'an as an example,using a geographical information system platform,a negative list of adverse factors for the underground space resources in Xi'an City are evaluated,and preventive measures are *** resources,exploitable resources,and the potential growth of exploitable underground space resources are *** space assessment in the different development stages of the city,collaborative utilization and safety evaluation for multiple subsurface resources,environmental impact and assessment,as well as evaluation methods based on big data and intelligent optimization algorithms are all discussed with the aim of serving city planning and construction.

关键词： Urban geology Negative list Natural resources for underground space Exploitable resources for underground space 3D geological structure model GIS platform Urban geological survey engineering Xi'an City Shaanxi Province China

A framework of force of information influence and application for C4KISR system

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2024年第2期35卷 430-443页

作者： mao Shaojie DIAO Lianwang SUN Yu WANG Heng YI Kan XU Xin mao Xiaobin zhang Kecheng sheng Long Science and Technology on Information Systems Engineering Laboratory The 28th Research Institute of China Electronics Technology Group CorporationNanjing 210007China Unit 94860 of the PLA Nanjing 210008China

The subversive nature of information war lies not only in the information itself, but also in the circulation and application of information. It has always been a challenge to quantitatively analyze the function and effect of information flow through command, control, communications, computer, kill, intelligence,surveillance, reconnaissance (C4KISR) system. In this work, we propose a framework of force of information influence and the methods for calculating the force of information influence between C4KISR nodes of sensing, intelligence processing,decision making and fire attack. Specifically, the basic concept of force of information influence between nodes in C4KISR system is formally proposed and its mathematical definition is provided. Then, based on the information entropy theory, the model of force of information influence between C4KISR system nodes is constructed. Finally, the simulation experiments have been performed under an air defense and attack scenario. The experimental results show that, with the proposed force of information influence framework, we can effectively evaluate the contribution of information circulation through different C4KISR system nodes to the corresponding tasks. Our framework of force of information influence can also serve as an effective tool for the design and dynamic reconfiguration of C4KISR system architecture.

关键词： information warfare command control communications computer kill intelligence surveillance reconnaissance(C4KISR)system information circulation force of information influence information entropy

Monodisperse Spherical Sandwiched Structured SiO_(2)@CsPbX_(3)@SiO_(2) Perovskite Composites for the Determination of Fe^(3+) Ion in Water Samples

在线全文

学校读者我要写书评

暂无评论

Journal of Analysis and Testing 2021年第1期5卷 40-50页

作者： Xiao-Hong Tan Guo-Bin Huang Zhi-Xiong Cai Fei-Ming Li Yan-Mei Zhou mao-sheng zhang College of Chemistry Chemical Engineering and EnvironmentMinnan Normal UniversityZhangzhou 363000China Institute of Analytical Technology and Smart Instruments and Colleague of Environment and Public Healthy Xiamen Huaxia UniversityXiamen 361024China Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology Minnan Normal UniversityZhangzhou 363000China

The application of all-inorganic CsPbX_(3)(X=Cl^(-),Br^(-)and I^(-))perovskite nanocrystals(PNCs)is hindered by their poor stability under diff erent environments(moisture,UV light and high temperature).Herein,we demonstrate a novel in-situ growth and post-coating technique to prepare monodisperse spherical sandwiched structured SiO_(2)@CsPbX_(3)@SiO_(2)perovskite *** this strategy,the environmental stability of CsPbX_(3)PNCs is remarkably improved due to protecting evenly distribution in the surface of composites through the design of spherical sandwiched structure,and the negative eff ects of SiO_(2)coating on photoluminescence property of CsPbX_(3)PNCs could be reduced eff ***,regular monodisperse spherical structure and uniform size of composites greatly benefit their application in relative *** experiment results indicate that the as-prepared product have outstanding abilities of water-,oxidation-and UV radiation ***,the SiO_(2)@CsPbBr_(3)@SiO_(2)perovskite composites are successfully used for highly sensitive detection of Fe^(3+)in water *** results show limit of detection(LOD)is 3μM and good linearity is between 10 and 70μM(R^(2)=0.9963).Furthermore,the proposed perovskite composites have been successfully applied for the analysis of Fe^(3+)in real samples with satisfactory results.

关键词： Perovskite nanocrystals Luminescence Detection Fe^(3+)

Multidimensional hollow SiO_(2)/C nanofibers modified by magnetic nanocrystals for electromagnetic energy conversion and lithium battery storage

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第8期17卷 7301-7314页

作者： Chen Han Qi Zheng Juncheng Jin Jiajia zhang Wen-Qiang Cao Kun Xiang Min zhang mao-sheng Cao Anhui Provincial Laboratory of Biomimetic Sensor and Detecting Technology College of Materials and Chemical EngineeringWest Anhui UniversityLu’an 237012China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Department of Physics Beijing Technology and Business UniversityBeijing 100048China

Multifunctional materials are powerful tools to support the advancement of energy conversion *** with prominent electromagnetic and electrochemical properties can realize the conversion of electromagnetic energy and solve the subsequent storage ***,an electrospinning-thermal reduction method is employed to construct ultrafine nickel nanoparticle modified porous SiO_(2)/C(Ni-SiO_(2)/C)hollow nanofibers as promising materials for applications in both electromagnetic wave absorption(EMA)and lithium-ion ***,when used as an EMA material,the reflection loss(RL)of Ni-SiO_(2)/C can reach−47.8 dB at 15.8 GHz with a matching thickness of 2.2 *** excellent microwave absorption performance can be attributed to the enhanced conduction loss,polarization relaxation,synergistic magnetic loss,and preferred impedance matching,which result from multi-component magnetic/dielectric synergy and the unique interconnected multidimensional hollow ***,the electronic conductivity and electrochemical activity of the samples are significantly enhanced due to the uniform distribution of ultrafine Ni nanoparticles in the amorphous SiO_(2)/C ***,the hierarchical hollow porous structure provides sufficient free space for volume change during lithiation/delithiation ***,the Ni-SiO_(2)/C nanocomposite exhibits a high reversible capacity of 917.6 mAh·g^(−1)at 0.1 A·g^(−1).At a high current density of 2 A·g^(−1),a capacity of 563.9 mAh·g^(−1)can be maintained after 300 *** energy conversion-storage device is designed to store waste electromagnetic energy in the form of useful electrical *** work inspires the development of high-performance bifunctional materials.

关键词： Ni-SiO_(2)/C nanofiber electromagnetic absorption lithium-ion storage electrospinning multidimensional structure

Efficacy comparison between Mathieu combined urethral plate incision and onlay island flap urethroplasty for distal hypospadias in patients with urethral plate stenosis

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

Asian Journal of Andrology 2024年第4期26卷 433-438页

作者： Tao zhang An-Bang Zhu Chang-Kun mao Yong-sheng Cao Department of Urology Anhui Provincial Children’s HospitalHefei 230000China The Fifth School of Clinical Medicine Anhui Medical UniversityHefei 230000China.

The aim of the study was to compare the efficacy of Mathieu combined urethral plate incision(Mathieu-IP)versus onlay island flap urethroplasty in patients with distal hypospadias complicated by urethral *** clinical data of 70 patients with distal hypospadias complicated by urethral plate stenosis treated in the Department of Urology,Anhui Provincial Children’s Hospital(Hefei,China),from May 2019 to May 2022,were retrospectively ***-eight patients underwent Mathieu-IP(Mathieu-IP group)and 32 underwent onlay island flap urethroplasty(Onlay group).Follow-ups at 1 month,6 months,and 12 months postoperatively assessed operative time,complications,urethral meatus morphology,and family *** Mathieu-IP group had significantly shorter operative time(mean±standard deviation[s.d.]:81.58±5.18 min)versus the Onlay group(mean±s.d.:110.75±6.05 min;P0.05).Complications were comparable between the *** Mathieu-IP group resulted in a vertical slit-shaped urethral meatus in 89.5%versus 13.8%in the Onlay group(P<0.05).Family satisfaction with general penile appearance and skin shape showed no significant differences,but the Mathieu-IP group had higher satisfaction with meatal position(P<0.05).Mathieu-IP offers simplicity,safety,and shorter operative time compared to *** the techniques effectively treat urethral plate stenosis in distal hypospadias,with reduced postoperative complications compared to tubularized incised plate ***-IP results in a vertical slit-shaped urethral meatus which enhances urinary stream,indicating its potential for broader adoption.

关键词： longitudinal urethral plate incision Mathieu onlay island flap urethroplasty urethral stenosis

The influences of perforating phase and bedding planes on the fracture deflection in laminated shale

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

Petroleum Science 2024年第2期21卷 1221-1230页

作者： Ming-Zhe Gu mao sheng Xiao-Ying Zhuang Xin-Yi Li Gen-sheng Li National Key Laboratory of Petroleum Resources and Engineering China University of PetroleumBeijing102249China College of Petroleum Engineering China University of PetroleumBeijing102249China College of Civil Engineering Tongji UniversityShanghai200092China

The perforating phase leads to complex and diverse hydraulic fracture propagation behaviors in laminated shale formations. In this paper, a 2D high-speed imaging scheme which can capture the interaction between perforating phase and natural shale bedding planes was proposed. The phase field method was used to simulate the same conditions as in the experiment for verification and hydraulic fracture propagation mechanism under the competition of perforating phase and bedding planes was *** results indicate that the bedding planes appear to be no influence on fracture propagation while the perforating phase is perpendicular to the bedding planes, and the fracture propagates along the perforating phase without deflection. When the perforating phase algins with the bedding planes, the fracture initiation pressure reserves the lowest value, and no deflection occurs during fracture propagation. When the perforating phase is the angle 45°, 60°and 75°of bedding planes, the bedding planes begin to play a key role on the fracture deflection. The maximum deflection degree is reached at the perforating phase of75°. Numerical simulation provides evidence that the existence of shale bedding planes is not exactly equivalent to anisotropy for fracture propagation and the difference of mechanical properties between different shale layers is the fundamental reason for fracture deflection. The findings help to understand the intrinsic characteristics of shale and provide a theoretical basis for the optimization design of field perforation parameters.

关键词： Shale Propagation Perforating Bedding Structure