基于BP神经网络的纤维混凝土力学性能预测模型

基于BP神经网络预测模型对不同材料掺量的纤维混凝土进行混凝土力学性能预测,找到适宜的隐藏层单元数和误差目标值.通过将预测数据和实测数据进行对比,研究该预测模型对于混杂纤维混凝土强度预测的可行性.经检验当隐藏层单元数为9个,目标误差值为1e-7时,预测值的准确性最高.     

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.

     

测验等值设计新探讨:ETP设计

项目反应理论框架下新的基于题库的大型测验的等值设计:等值到题库设计(ETP设计),与其他传统等值设计相比,可以避免传统共同组设计和共同题设计的一些缺点,并能够在保证等值精度的情况下对测验进行等值。在目前许多大型考试已有题库的情况下,ETP设计具有较大的发展空间。     

“以教促学”模式下大学生英语自主学习实证研究

我国目前大学英语教学整体效果不佳,部分可归结为以教师为中心的传统过时的教学模式.因此探索新的以学生为中心的教学模式,培养学生的自主学习能力势在必行.采用“以教促学”模式,学生小组合作、自主讲课是一种有益的实践,和传统教学模式相比具有一定优势.     

论稼轩词军事意象及其当代意义

辛弃疾词作中的兵器类意象、动态军事意象和军人类意象这三大突出军事意象,不仅显示了辛词的个性特色,而且蕴含了词人独特的情怀。军事意象体现了辛弃疾感人肺腑的末路英雄情怀,同泽同袍的高尚友情和矢志不渝的报国情怀。同时辛词的军事意象还阐发了一些现代意义,对当代中华民族实现中国梦有一定的精神