区域知识产权管理系统协同及其演变的实证研究

界定并解析了区域知识产权管理系统的概念及内在结构,建立了基于融合演变速度状态和演变速度趋势等速度特征的改进复合系统协同度模型,实证测度了我国各省区2007—2013年知识产权管理系统协同及其演变综合效度,实证结果表明:东部发达地区在该时期内知识产权管理系统协同度较高,但其演变综合效度却呈现疲软甚至下降态势;相比之下,虽然中西部欠发达地区各个时序的知识产权管理系统协同度较低,但其演变综合效度处于快速上升的发展状态。最后根据实证结果提出了进一步强化区域知识产权管理系统协同及其演变综合效度的对策建议。     

CFG桩复合地基变形特性及影响因素

随着地基处理技术的发展,复合地基在工程中得到广泛的应用。分析CFG桩复合地基变形特性是进行工程设计的前提,而影响变形的主要因素是研究CFG复合地基变形特性的关键。     

旅游地复合系统开发运行协调机制研究

从协同论出发，旅游地复合系统(简称TDCS)开发是一种针对复合系统内众多要素的综合协调、整体协调和动态长远的协调。本文在阐明TDCS协调开发概念的基础上，指出TDCS协调开发的动力要素主要由需求动力、收入推力、时间助力、产品引力、促销拉力和政府调控力组成，并论述其内在协调机制和整合协调，对于增强旅游地的竞争力和吸引力，发挥人的调控作用具有重要意义。     

计算机辅助电路分析的应用——放大电路节点电压方程建立方法的讨论

本文较为详细地讨论了计算机建立节点电压方程的方法,在此基础上,通过一个实例,阐述了如何对放大电路进行计算机的辅助分析。     

材料力学中组合梁组合变形的一种通用解法

两种或多种不同材料制成的组合梁是工程实际中的一种常用结构。本文基于材料力学中的平面假设、胡克定律等基本假设和概念,给出了组合梁组合变形分析的一种通用解法,建立轴力、弯矩与拉伸位移和弯曲挠度的关系,推导出拉伸位移和弯曲挠度满足的微分方程。该分析方法简单易懂,适合材料力学教学和工程实际应用。     

Bearing capacity of composite columns reinforced by concrete filled steel tube

In this study, nine simplified short composite columns consisting of core CFST (concrete filled steel tube) of different diameters and outer reinforced concrete were constructed to study their compressive performance under axial or eccentric compression. The failure mode is characterized by the crush of the outer concrete. The bearing capacity increases at first and then decreases with further increase of the position coefficient. It can be concluded that position coefficient is an important structural parameter that has considerable influences on the ultimate bearing capacity of the composite columns. The outer concrete, steel tubes and longitudinal reinforcement are found to work in a cooperative manner under axial or eccentric compression when the position coefficient is about 0.5. An improved bearing capacity algorithm that takes the position coefficient into account has been proposed based on the experimental and simulation results and current technical specification in China. It has been proven to be precise and safe.     

国民体质综合指数数学模型的建立

国民体质综合指数是反映人口总体综合体质水平的无量纲动态相对数 ,用以描述群体的体质水平。依据国民体质综合指数的功能需求及特性 ,通过文献资料调研、算法分析、测度分析、构成指标的属性分类及对应算法等方法 ,建立了国民体质综合指数的数学模型 ,同时讨论了国民体质综合指数的应用解析。     

Perceptual skills and Arabic literacy patterns for mathematically gifted children with specific learning difficulties

Phonological awareness is a key factor in the development of literacy, and frequently presents itself as an area of weakness in pupils with reading difficulties. In this article, Anies Al-Hroub of the American University of Beirut sets out to define a distinguishing pattern of characteristics that supports the identification of pupils with specific learning difficulties who are gifted in mathematics and reports the assessment of the pupils' visual and auditory perceptual skills, including phonological awareness. The assessments were designed to measure auditory and visual memory skills, auditory and visual analysis skills, speed of information processing and spoken language (receptive and expressive). Furthermore, aspects of language learning such as reading, writing, spelling and parts of listening ability were all assessed for mathematically gifted pupils with specific learning difficulties who scored above the cut-off score of 120 on the WISC-III-Jordan. The article closes with recommendations for further research.     

中欧规范钢-混组合梁抗弯承载力计算方法对比

在收集钢-混凝土组合梁试验研究资料的基础上,分别采用中国规范GB 50917-2013、JGJ 138-2016、欧洲规范Eurocode 4(简称EC4)及线弹性法,计算所收集试件的抗弯承载力,并与试验结果进行比较。结果表明:GB 50917-2013、JGJ 138-2016与EC4中抗弯承载力的计算方法,主要的不同在于有效宽度的取值、是否考虑滑移效应的影响以及是否计入纵向钢筋对抗弯承载力的贡献GB 50017-2017与JGJ 138-2016的计算方法得到的抗弯承载力的计算理论值与试验实测值更加接近,且数据更为稳定GB 50917-2013不仅考虑了整体栓钉布置导致的滑移效应,还考虑了纵向钢筋对承载力的贡献,所计算出的结果偏于保守线弹性法比塑性理论更为保守。由于目前的计算方法与实际情况仍有一定误差,下一步建议从有效宽度、纵向钢筋对抗弯承载力的贡献与滑移效应的角度出发,提出更适用于计算钢-混凝土组合梁抗弯承载力的方法。     

Influence of medium components on elastase production using crude sources by Bacillus sp. EL31410

A newly isolated strain EL31410, producing elastase (E.C3.4.4.7) with high elastolytic activity was identified as Bacillus sp. In the medium optimization, it was found that wheat bran and soybean flour hydrosate were the best crude carbon and nitrogen source for enzyme production, respectively. Addition of corn steep flour can affect the bacterium growth and elastase production. A fractional factorial design was applied to study the main factors that affect the enzyme production, and central composite experimental design and response surface methodology were adopted to derive a statistical model for the effect of wheat bran and soybean flour hydrosate on elastase production. The experimental results showed that wheat bran had positive effect but soybean flour hydrosate had negative effect, on enzyme production. An initial concentration of 3.4%(w/v) wheat bran and 9.4%(v/v) soybean flour hydrosate were found to be optimal for enzyme production in batch culture. The time course of elastase production in the optimized medium composition was also described.