一种改进的空域图像信息隐藏算法

基于可逆矩阵乘法,提出了一种基于LSB的空域图像信息隐藏算法。与基于Arnold置乱的算法相比,本文算法的时间和空间复杂度较低,且有较强的抗攻击能力。     

从IC到AC:国外大学图书馆学术共享空间的发展与启示

随着读者需求的个性化,信息共享空间开始向不同的模式发展。学术共享空是信息共享空间功能的扩展。国外的学术共享空间两种服务模式即机构知识库和"一站式"学术支持服务,对我国大学图书馆服务创新有三点启示:构建学术服务平台,提高人员素质和结构,加强评价与跟踪。     

国家图书馆社会责任再思考

论述了我国国家图书馆应承担的社会责任及履行社会责任的具体措施,并对国家图书馆社会责任的拓展进行了探讨。     

科技论文学术影响力评价探究

基于国内主流数据库资源的对比分析,提出科技论文学术影响力评价要素及途径.以知网为主、其他数据库为辅设计评价指标,构建定量指标和定性指标相结合的评价体系,以期对科技论文学术影响力进行评价.     

对通俗舞蹈与艺术舞蹈的融通发展的若干思考

舞蹈是人们在日常生活中为了表达情感应运而生的,经过人们不断地升华,它所表达的内容又是高于生活的。舞蹈主要分为通俗舞蹈和艺术舞蹈,由于两者的风格不同,被人们接受的程度也不尽相同,二者的发展出现了不平衡的状况。本文分析了通俗舞蹈与艺术舞蹈融通发展的关系。     

Time-frequency analysis of EEG signals evoked by voluntary,stimulated and imaginary motions

In order to investigate the characteristics of sensorimotor cortex during motor execution(ME), voluntary, stimulated and imaginary finger flexions were performed by ten volunteer subjects. Electroencephalogram(EEG) data were recorded according to the modified 10-20 International EEG System. The patterns were compared by the analysis of the motion-evoked EEG signals focusing on the contralateral(C3) and ipsilateral(C4) channels for hemispheric differences. The EEG energy distributions at alpha(8—13 Hz), beta(14—30 Hz) and gamma(30—50 Hz) bands were computed by wavelet transform(WT) and compared by the analysis of variance(ANOVA). The timefrequency(TF) analysis indicated that there existed a contralateral dominance of alpha post-movement event-related synchronization(ERS) pattern during the voluntary task, and that the energy of alpha band increased in the ipsilateral area during the stimulated(median nerve of wrist) task. Besides, the contralateral alpha and beta event-related desynchronization(ERD) patterns were observed in both stimulated and imaginary tasks. Another significant difference was found in the mean power values of gamma band(p0.01)between the imaginary and other tasks. The results show that significant hemispheric differences such as alpha and beta band EEG energy distributions and TF changing phenomena(ERS/ERD) were found between C3 and C4 areas during all of the three patterns. The largest energy distribution was always at the alpha band for each task.     

安徽省亲子运动形式与内容之研究

运用问卷调查、走访、电话、座谈等方式,对安徽省亲子运动的开展形式和内容进行了调查与分析,结果表明安徽省家庭亲子运动组织形式没有规律性、规模性,活动空间选择性很小,活动频率很低,活动时间很短,活动项目内容多样化,各个家庭各具特色,针对性很强,难以普及.据此提出了促进安徽省亲子运动开展形式与内容的建议.     

民族高校计算机专业课程双语教学探讨

首先从通用性、可比性等方面强调了计算机课程双语教学的必要性,然后以《汇编语言程序设计》课程为实例,从教学模式、教学科目具体化两方面探讨如何确定教学方案,并对教学对象、教学资源、教学过程和教学实验等教学要素展开讨论.最后基于学生调查问卷和实际教学效果,分析了当前存在的问题,为进一步提高民族高校的计算机专业发展提出一些思路.     

Fabrication of Ce-ReS2 by Molten Salt for Electrochemical Hydrogen Evolution

Renewable and economical generation of hydrogen via electrochemical methods shows great potential in addressing the energy crisis. In this study, an emerging molten salt method was adopted for the synthesis of a cerium-modified rhenium disulfide nanosheet for electrical hydrogen evolution reactions. The prepared 1% Ce-doped rhenium disulfide (ReS₂) sample showed promoted hydrogen evolution performance in both acid and alkaline electrolytes compared to bare ReS₂. Generating of abundant defects in ReS₂ exposed more reaction active sites. Moreover, adding cerium accelerated the hydrogen evolution dynamics. Hopefully, this work will offer new insight into developing ReS₂-based electrocatalysts for hydrogen evolution reactions.

     

数字资源唯一标识符体系系统分析

唯一标识符体系是实现数字资源统一编号、规范管理、精确定位和透明利用的信息基础设施。文章重点对唯一标识符体系进行系统分析,阐述唯一标识符系统架构、建设模型、服务模型,并对唯一标识符系统的应用模式进行分析。