检索结果-南通市图书馆

An Alternative Approach to Construct the Initial Hamiltonian of the Adiabatic Quantum Computation

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

Chinese Physics Letters 2013年第1期30卷 9-12页

作者： duan qian-heng ZHANG Shuo WU Wei CHEN Ping-Xing Department of Physics National University of Defense TechnologyChangsha 410073 State Key Laboratory of High Performance Computing National University of Defence TechnologyChangsha 410073

The adiabatic quantum computation(AQC)has been proven to be equivalent to the standard circuit ***,AQC evolves from the initial Hamiltonian which has a uniform equal superposition of the computational basis to the final Hamiltonian whose ground state encodes the solution to a computation *** propose an alternative approach to construct the initial Hamiltonian of the AQC which has an unequal superposition of the possible solutions to the problem and show that an educated guess can improve the performance of AQC.

关键词： problem. Hamiltonian superposition

基于标记配对相干态光源的实用化诱骗态量子随机数发生器

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

密码学报 2023年第1期10卷 73-86页

作者：李元昊费洋扬王卫龙孟祥栋王洪段乾恒马智数学工程与先进计算国家重点实验室郑州450001 河南省网络密码技术重点实验室郑州450001

基于维度目击的量子随机数发生协议中需要使用完美的单光子源,现实中难以低成本、较方便地实现.本文给出了一种基于标记配对相干态光源的实用化诱骗态量子随机数生成协议,利用三强度诱骗态的方法可以准确估计出随机数生成协议的最小熵,... 详细信息

基于维度目击的量子随机数发生协议中需要使用完美的单光子源,现实中难以低成本、较方便地实现.本文给出了一种基于标记配对相干态光源的实用化诱骗态量子随机数生成协议,利用三强度诱骗态的方法可以准确估计出随机数生成协议的最小熵,随机数提取率比基于弱相干态光源的诱骗态量子随机数生成协议更高.分析探测器的探测效率、后脉冲和探测效率不匹配对该协议安全性造成的影响,探测器的探测效率与最小熵呈正相关;后脉冲增加会降低输出的最小熵,影响随机数的安全性;在非对称基矢探测器效率的情况下,若其中一个测量基的探测效率较高,则该协议可以在另一个测量基的探测效率任意接近于0的情况下输出量子随机数.

关键词：量子随机数发生器标记配对相干态光源诱骗态

数字赋能乡村教育现代化的实然困境与优化路径

在线全文

学校读者我要写书评

暂无评论

教学与管理 2025年第1期 6-11页

作者：王倩吴家华胡恒钊安徽大学马克思主义学院合肥230601 江西农业大学马克思主义学院南昌330045

以数字赋能为发展契机,推进乡村教育现代化是中国式教育现代化的必然要求,也是乡村全面振兴的重要依托。在教育领域,数字技术蕴含着驱动乡村教育现代化发展的重要价值,能够有效扩大优质教育资源的覆盖范围、变革乡村教育形态、推动乡土... 详细信息

以数字赋能为发展契机,推进乡村教育现代化是中国式教育现代化的必然要求,也是乡村全面振兴的重要依托。在教育领域,数字技术蕴含着驱动乡村教育现代化发展的重要价值,能够有效扩大优质教育资源的覆盖范围、变革乡村教育形态、推动乡土文化的交流传播。但在推动数字赋能乡村教育现代化的实践中,面临着数字教育观念淡薄、数字基础条件不足、师生数字素养薄弱等现实阻碍,迫切需要从重塑价值观念、完善数字设施、培养师生数字素养、加强体制建设入手,为数字赋能乡村教育现代化发展注入新动力,以适应中国式教育现代化发展的新生态。

关键词：数字赋能乡村教育中国式教育现代化乡土文化

In Situ Coupling Strategy for Anchoring Monodisperse Co_9S_8 Nanoparticles on S and N Dual?Doped Graphene as a Bifunctional Electrocatalyst for Rechargeable Zn–Air Battery

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

Nano-Micro Letters 2019年第1期11卷 64-77页

作者： Qi Shao Jiaqi Liu Qiong Wu qiang Li heng?guo Wang Yanhui Li qian duan School of Materials Science and Engineering Changchun University of Science and Technology

An in situ coupling strategy to prepare Co_9S_8/S and N dual?doped graphene composite(Co_9S_8/NSG) has been proposed. The key point of this strategy is the function?oriented design of organic compounds. Herein, cobalt porphyrin derivatives with sulfo groups are employed as not only the coupling agents to form and anchor Co_9S_8 on the graphene in situ, but also the heteroatom?doped agent to generate S and N dual?doped graphene. The tight coupling of multiple active sites endows the composite materials with fast electrochemical kinetics and excellent stability for both oxygen reduction reaction(ORR) and oxygen evolution reaction(OER). The obtained electrocatalyst exhibits better activity parameter(ΔE = 0.82 V) and smaller Tafel slope(47.7 mV dec^(-1) for ORR and 69.2 mV dec^(-1) for OER) than commercially available Pt/C and RuO_2. Most importantly, as electrocatalyst for rechargeable Zn–air battery, Co_9S_8/NSG displays low charge–discharge voltage gap and outstanding long?term cycle stability over 138 h compared to Pt/C–RuO_2. To further broaden its application scope, a homemade all?solid?state Zn–air battery is also prepared, which displays good charge–discharge performance and cycle performance. The function?oriented design of N_4?metallomacrocycle derivatives might open new avenues to strategic construction of high?performance and long?life multifunctional electrocatalysts for wider electro?chemical energy applications.

关键词： In situ coupling strategy Porphyrin derivate Doped graphene Metal sulfide Bifunctional electrocatalyst Rechargeable Zn–air battery

Synthesis of novel thieno-[3,4-b]-pyrazine-cored molecules as red fluorescent materials

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2013年第9期24卷 809-812页

作者： Di Liu Yong-heng duan State Key Laboratory of Fine Chemicals School of Chemistry Dalian University of Technology

Two novel thieno-[3,4-b]-pyrazine-based molecules, TP-E and TP-O, were designed and synthesized for potential application as red fluorescent emitters. The bulky tetraphenylethylene groups were attached at the periphery of the thieno-[3,4-b]-pyrazine core to form the non-planar molecules, as efficient solid- state emitting materials. The peripheral groups were grafted to the emissive core through either a conjugated acetylene bond, or a non-conjugated ether bond. These molecules exhibit strnng red fluorescence in both dilute solutions and in thin films with large Stokes shifts of over 100 nm. The cyclic voltammetry measurements showed the reversible oxidation and reduction behavior for both compounds. All these properties indicate the two compounds are possible functional materials for use in ontoelectronic devices.

关键词： Red fluorescent materials Thieno-[ 3 4-b ]-pyrazine Tetraphenylethylene Large Stokes shifts

Overriding the inherent alkalinity to dual phosphinito bimetallic catalyst for C(sp^(2))-C(sp^(3))formation:A combined computational and experimental study

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第8期34卷 147-152页

作者： Sujuan Zheng heng Zhang qian Peng State Key Laboratory of Elemento-Organic Chemistry Tianjin Key Laboratory of Biosensing and Molecular RecognitionFrontiers Science Center for New Organic MatterCollege of ChemistryNankai UniversityTianjin 300071China Haihe Laboratory of Sustainable Chemical Transformation Tianjin 300192China

Unraveling the catalytic reaction mechanism is a long-term challenge for developing efficient *** blooming bimetallic catalyst have enabled to activate inert bonds and realize complex C-C ***,we theoretically discover a dual-phosphinito bridged hetero-bimetallic species that verified by NMR *** results indicate only dual-phosphinito Ni-Al model can be an active catalyst in asymmetric cycloadditions via C-C activation and C-H activation,which can well rationalize the experimental observations for both reactivity and *** unprecedented tandem redox dehydrogenation mechanism was revealed to control the formation of this active species overriding the inherent *** Lewis acid and eg orbital interactions,including dz2 orbital reoccupation and d_(x^(2)−y^(2))orbital recombination,were disclosed to understand both thermodynamic and kinetic advance of dual-bridged model,displaying feasible redox properties.

关键词： Ni-Al bimetallic catalysis Secondary phosphine oxides Redox dehydrogenation Dual-SPO model

Analysis of the Leading Modes of Autumn Precipitation over the Yangtze River Basin

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2021年第4期20卷 803-810页

作者： qian heng XU Shibin WU Xin College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China Ocean and Fishery Bureau of Dongying Dongying 257091China

Based on daily precipitation data from 109 stations in the Yangtze River Basin(YRB)over the past 36 years(1980-2015),the Empirical Orthogonal Function(EOF)is employed to analyze changes in autumn *** used the monthly mean re-analysis datasets of atmospheric circulation and sea surface temperature(SST)to investigate the possible causes of the two leading modes,based on which the predictive equations were constructed and *** results of the EOF analysis show that the variance contribution of the first mode is 31.07%,and the spatial distribution shows a uniform variation over the whole *** variance contribution of the second mode is 15.02%,and the spatial distribution displays a north-south dipole pattern in the *** leading mode shows a dominant interannual variation,which is mainly due to the West Pacific subtropical high and anticyclones over the Philippine *** SST field corresponds to the positive phase of the eastern Pacific El Niño and the tropical Indian Ocean *** second mode may be related to the Indian Ocean-East Asian teleconnection and early withdrawal of the summer *** SST field corresponds to a weaker central Pacific El Niñ*** a stepwise regression analysis,SST anomalies in some areas during summer show a good predictive effect on the autumn precipitation mode in the YRB region.

关键词： YRB autumn precipitation IOD ENSO predictable mode

The microstructural evolution and wear properties of Ni60/high-aluminum bronze composite coatings with directional structure

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第4期40卷 952-960页

作者： Xiao-Tian Yang Xiu-qian Li qiang-Bin Yang Jun-Ling duan Xiao-Yue Fu heng-Li Wei Wen-Sheng Li College of Materials Science and Engineering State Key Laboratory of Advanced Processing and Recycling of Nonferrous MetalsLanzhou University of TechnologyLanzhou 730050China Wenzhou Engineering Institute of Pump&Valve Lanzhou University of TechnologyWenzhou 325105China Chongqing Key Laboratory of Environmental Materials&Remediation Technologies College of Chemistry&Environmental EngineeringChongqing University of Arts and SciencesChongqing 402160China Department of Material and Chemical Engineering College of Technology and EngineeringLanzhou University of TechnologyLanzhou 730050China

The directional structure of Ni60/high-aluminum bronze composite coating was formed using induction remelting and forced *** microstructural evolution and the characteristics of interface growth were *** results showed that the remelted coating formed metallurgical bonding with the *** micros tructures changed from plane crystal to dendrite,cellular dendrite,fine cellular dendrite,and then to dendrite again with the increase in the cooling *** crystal grew along the heat flow direction and had(111) and(200)preferred orientations when the cooling rate was 1.886 ml-min^(-1).mm^(-2).The plane crystal,dendrite and cellular dendrite were mainly composed of compounds and solid solutions with Ni,Fe and Cu,and they were surrounded by strengthening phases composed of Cr,C and *** grain boundary of directional structure coatings showed the characteristic of regular eutectic growth,but grain boundary of remelted coating presented characteristic of divorced eutectic *** wear resistance of directional structure coatings is better than that of remelted coating.

关键词： Aluminum bronze composite coating Induction remelting Directional structure Grain boundaries Preferred orientation

Robust Global Stabilization of Spacecraft Rendezvous System via Gain Scheduling

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2014年第4期11卷 426-433页

作者： qian Wang Guang-Ren duan Center for Control Theory and Guidance Technology Harbin Institute of Technology

The problem of robust global stabilization of a spacecraft circular orbit rendezvous system with input saturation and inputadditive uncertainties is studied in this paper. The relative models with saturation nonlinearity are established based on ClohesseyWiltshire equation. Considering the advantages of the recently developed parametric Lyapunov equation-based low gain feedback design method and an existing high gain scheduling technique, a new robust gain scheduling controller is proposed to solve the robust global stabilization problem. To apply the proposed gain scheduling approaches, only a scalar nonlinear equation is required to be *** from the controller design, simulations have been carried out directly on the nonlinear model of the spacecraft rendezvous operation instead of a linearized one. The effectiveness of the proposed approach is shown.

关键词： Robust global stabilization spacecraft rendezvous system parametric Lyapunov equation input saturation input-additive uncertainties gain scheduling