检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

绘就新时代中小学科学教育美好画卷

中小学校长 2024年第6期 23-26页

作者： Zhejiang Provincial education Department 浙江省教育厅

浙江省通过做好校内科学教育、内外资源联动、教育集成改革这“三篇文章”,統筹推动科学教育工作落地见效,逐步形成党委、政府统一领导,相关部门齐抓共管,校内校外共融共建的中小学科学教育新格局,全面提升省城内中小学生科学素养。

关键词：中小学科学教育 “双减” 省城实践

在线全文

学校读者我要写书评

暂无评论

浙江杭州:以综合改革实现“教育共富”

中国基础教育 2024年第8期 31-35页

作者： The Municipal education Bureau of Hangzhou 浙江省杭州市教育局浙江杭州310003

教育共富作为杭州市基础教育综合改革的重要目标和内容,以全面提升区域教育品质为核心要旨,通过名校集团化办学、名师乡村工作室、组团式教育对口服务、初中提质强校、阳光招生等改革举措,加快打造共同富裕示范区城市范例的教育样本,更... 详细信息

教育共富作为杭州市基础教育综合改革的重要目标和内容,以全面提升区域教育品质为核心要旨,通过名校集团化办学、名师乡村工作室、组团式教育对口服务、初中提质强校、阳光招生等改革举措,加快打造共同富裕示范区城市范例的教育样本,更好地满足了人民群众对更公平、更优质教育的需求。

关键词：区域教育综合改革基础教育综合改革实验区基础教育高质量发展教育共富名校集团化办学名师乡村工作室

Evolutionary cryptography against multidimensional linear cryptanalysis

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2011年第12期54卷 2585-2597页

作者： ZHANG HuanGuo 1,2., LI ChunLei 1,2.& TANG Ming 1,2.1 School of Computer, Wuhan University, Wuhan 430079, China 2.Key Laboratory of Aerospace Information Security and Trusted Computing of ministry of education of China, Wuhan University, Wuhan 430079, China 1. School of Computer Wuhan University Wuhan 430079 China2. Key Laboratory of Aerospace Information Security and Trusted Computing of Ministry of Education of China Wuhan University Wuhan 430079 China

The evolutionary cryptosystem is a new cryptosystem proposed by a Chinese researcher recently. This paper studies its security level resisting against multidimensional linear cryptanalysis in this paper. It is shown that the evolutionary cryptosystem possesses higher resistance than its initial fixed cryptosystem does for resisting against multidimensional linear cryptanalysis. Multidimensional generalizations of Matsui's Algorithm 1 and Algorithm 2.based on log-likelihood ratio (LLR) statistics are introduced. By the relationship among the data complexity N , the bit advantage a and the success rate P S of these two multidimensional generalized algorithms, it is proven that more data is needed for attacking the evolutionary cryptosystem than that is needed for attacking its initial fixed cryptosystem when the bit advantage and success rate are identical. Moreover, it is shown that both time complexity and memory complexity for attacking the evolutionary cryptosystem are higher than that of attacking its initial fixed cryptosystem with the same data complexity. The research indicates that the evolutionary cryptosystem is more robust than its initial fixed cryptosystem against the multidimensional linear cryptanalysis.

关键词： information security cryptology evolutionary cryptosystem cryptanalysis multidimensional linear cryptanalysis

Capability of evolutionary cryptosystems against differential cryptanalysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2011年第10期54卷 1991-2000页

作者： ZHANG HuanGuo 1,2.,LI ChunLei 1,2.& TANG Ming 1,2.1 School of Computer,Wuhan University,Wuhan 430072.China 2.Key Laboratory of Aerospace Information Security and Trusted Computing of ministry of education,Wuhan University,Wuhan 430072.China 1. School of Computer Wuhan University Wuhan 430072 China2. Key Laboratory of Aerospace Information Security and Trusted Computing of Ministry of Education Wuhan University Wuhan 430072 China

The evolutionary cryptosystem is a new *** paper studies its security level resisting against differential *** is shown that the evolutionary cryptosystem possesses higher resistance than its initial fixed cryptosystem against differential *** the basis of the relationship among the data complexity,the bit advantage and the success rate of differential cryptanalysis,it is proven that more data is needed for attacking the evolutionary cryptosystem when the bit advantage and success rate are ***,it is shown that the time complexity for attacking the evolutionary cryptosystem is higher than that of differential attacking its initial fixed cryptosystem with the same amount of plaintext-ciphertext *** research indicates that the evolutionary cryptosystem is more robust than its initial fixed cryptosystem against differential cryptanalysis.

关键词： information security cryptology evolutionary cryptosystem cryptanalysis differential cryptanalysis

Durability of Asphalt Mixture in Different Corrosion Solution

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2011年第6期26卷 1200-1204页

作者：陈拴发关博文 Key Laboratory for Special Area Highway Engineering of ministry of education Chang’an University School of Materials Science and Engineering Chang’an University

The corrosion to asphalt mixture under different kinds of corrosion solution, such as pH=2.solution, pH=12.solution, pH = 12.solution and 10% Na2.O4 solution, was studied. The performance attenuation of asphalt mixture was analyzed under the normal environment and the freeze-thaw environment, and the analysis was given on the sensitivity of the test results to the evaluation index. The experimental results show that the performance of asphalt mixture is attenuated faster under the acidic solution, alkaline solution and sulfate solution. Corrosion factor Kc, freeze-thaw corrosion factor Kf, and freeze-thaw effect factor Kfc are proposed to evaluate asphalt mixture resistance to corrosion in different kinds of corrosion solution. The values of Kc and Kfc decrease with the increasing of corrosion time. The change rule of Kf show that the rate of corrosion is decreased by the action of freeze-thaw in acidic solution and in alkaline solution, but is increased by the action of freeze-thaw in sulfate solution. The microscopic analysis indicates that acid solution reacts with aggregate of asphalt mixture, alkaline solution reacts with asphalt cement of asphalt mixture, the surface tension of sulfate solution and crystallization of sulfate are the main reasons which weak the performance of asphalt mixture.

关键词： asphalt mixture corrosion damage corrosion mechanism corrosion evaluation

Emotional expectations influence neural sensitivity to fearful faces in humans:An event-related potential study

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2010年第11期53卷 1361-1368页

作者： YANG JieMin1,2. YUAN JiaJin1,2.& LI Hong1,2.1Key Laboratory of Cognition and Personality (SWU), ministry of education of China, Chongqing 400715, China 2.chool of Psychology, Southwest University, Chongqin 400715, China 1. Key Laboratory of Cognition and Personality (SWU) Ministry of Education of China Chongqing 400715 China2. School of Psychology Southwest University Chongqin 400715 China

The present study tested whether neural sensitivity to salient emotional facial expressions was influenced by emotional expectations induced by a cue that validly predicted the expression of a subsequently presented target face. Event-related potentials (ERPs) elicited by fearful and neutral faces were recorded while participants performed a gender discrimination task under cued (‘expected’) and uncued (‘unexpected’) conditions. The behavioral results revealed that accuracy was lower for fearful compared with neutral faces in the unexpected condition, while accuracy was similar for fearful and neutral faces in the expected condition. ERP data revealed increased amplitudes in the P2.component and 2.0–2.0 ms interval for unexpected fearful versus neutral faces. By contrast, ERP responses were similar for fearful and neutral faces in the expected condition. These findings indicate that human neural sensitivity to fearful faces is modulated by emotional expectations. Although the neural system is sensitive to unpredictable emotionally salient stimuli, sensitivity to salient stimuli is reduced when these stimuli are predictable.

关键词： negative bias facial emotions emotional expectation event-related potential

Microstructure and Mechanical Properties of Ultrafine Grained Mg15Al Alloy Processed by Equal-channel Angular Pressing

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2010年第2期25卷 238-242页

作者：王红霞梁伟 College of Materials Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology

An as-cast magnesium alloy with high Al content Mg15Al was subjected to equal-channel angular pressing （ECAP） through a die with an angle of φ= 90？ at 553 K following route Bc. It is found that the network β-Mg17Al12.phases in the as-cast Mg15Al alloy are broken into small blocks and dispersed uniformly with increasing numbers of pressing passes. Moreover, many nano-sized Mg17Al12.particles precipitate in the ultra-fine α-Mg matrix. The grains are obviously refined. However, the grain structure is inhomogeneous in different areas of the alloy. The average size of the primary phase α-Mg is reduced to about 1 μm while grains of around 0.1-0.2.μm are obtained in some two-phase areas. With additional ECAP passes （up to 8）, coarsening of the grains occurs by dynamic recovery. Room temperature tensile tests show that the mechanical properties of Mg15Al alloys are markedly improved after 4 ECAP passes. The ultimate tensile strength and elongation to failure increase from 150 MPa to 2.9.3 MPa and from 0.05% to 7.4%, respectively. Compared with that after 4 passes, the elongation to failure of the alloy increases but the strength of the alloy slightly decreases after 8 ECAP passes. Fracture morphology of the ECAP-processed alloy exhibits dimple-like fracture characteristics while the as-cast alloy shows quasi-cleavage fractures.

关键词： high-aluminum Mg Alloy β-Mg17Al12.phase ultra-fine grained microstructure mechanical properties equal-channel angular pressing

Controlled Size and Density Distribution of Nanoparticles by Thermal Ammonia Etching Method

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2010年第1期25卷 108-111页

作者：李刚 Key Laboratory of ministry of education for Conveyance and Equipment East China Jiaotong University Center for Photon Fabrication Science and Technology Jiangsu University

Nickel nanometer catalyst thin films were prepared on SiO2.Si substrates using sputtering coater. The effects of ammonia pretreatment on the catalyst films from continuous film to the nanoparticles were investigated. The nanostructures of the Ni thin films as a function of the catalyst film original thickness, the pretreatment time and temperature were discussed. The optimum parameters of etching process were obtained, and the functional mechanism of ammonia was primarily analyzed. Scanning electron microscopy （SEM） and atomic force microscopy （AFM） were used to evaluate the obtained nanoparticles. It is demonstrated that the controlled size and density distribution of the nanoparticles can be achieved by employing ammonia etching method.

关键词： ammonia etching nanoparticle density control thermal expansion

Node ordinal encoded genetic algorithm for the optimal allocation of water resources

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2005年第5期15卷 448-452页

作者： YANG Xiaohua1*, YANG Zhifeng 1,2. SHEN Zhenyao1 and LI Jianqiang3(1. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China 2. Key Laboratory for Water and Sediment Sciences ministry of education, School of Environment, Beijing Normal University, Beijing 100875, China 3. Water Resources and Hydropower Planning and Design General Institute, MWR, Beijing 100011, China) State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China Key Laboratory for Water and Sediment Sciences ministry of education School of Environment Beijing Normal University Beijing 100875 China Water Resources and Hydropower Planning and Design General Institute MWR Beijing 100011 China

A new method, node ordinal encoded genetic algorithm (NOEGA), is proposed for solving water resources optimal allocation problems, in which the capacity of water resources is split into a number of smaller parts so that successive operations can be overlapped. Our objective is to maximize the whole benefit function. To overcome the “dimensionality and algorithm complexity curse” while searching for solutions and looking for an optimal solution, the operations of one-point crossover operator, gene exchange operator, gene random operator, gene shift operator and node ordinal strings are established. It is proved to be an effective optimal method in searching for global solutions. The NOEGA does not need a diversity of initial population, and it does not have the problem of immature convergence. The results of two cases show that using NOEGA to solve the optimal allocation model is very efficient and robust. In addition, the algorithm complexity of NOEGA is discussed.

关键词： water resources optimal allocation node ordinal code genetic algorithm.