草地放牧适宜度理论及牧场管理策略

针对当前载畜量和放牧率较为模糊甚至混乱的认识，该文综述了载畜量及其相关术语的概念，论证了载畜量与放牧率的区别与联系，概括了放牧适宜度理论。主要结论为：载畜量是特定时期内一定面积的草地能够放牧德加储量的理论值，而放牧率则是特定时期内一定草地面积上实际放牧的家畜数量；载畜量是放牧率的额定标准（上限），当放牧率大于载畜量（超载）时，出现草地退化现象；放牧适宜度是最大经济收益下，维持草地（植物和动物）持续生产的最大放牧利用强度（即经济最佳放牧率）。     

文克尔地基薄板的瞬态响应分析

利用级数展开法和Laplace--Fourier变换推导了文克尔地基上无限长板在半波正弦瞬态荷载作用下位移和应力的解析解。计算和分析了板的位移响应情况,并和弹性地基静荷载情况的位移进行了比较,讨论了荷载作用时间、地基参数及板参数等对位移响应的影响。对路面设计、品质评价及破坏机理分析有重要意义。     

加强高职生职业化人才素质培养 提高就业能力

高职生要想在未来的市场竞争中拥有更大的竞争力,就必须要成为职业化人才。因此,要在学校的学习和企业的实习过程中,不断提高自己的职业素质和职业能力,成为应用技术性型人才。     

关于职业教育对经济社会贡献的探讨

职业教育在加快普及高中教育、提高教育年限、提高劳动者素质、促进经济增长、缩小收入差距等方面具有很大贡献.在当前中国加快经济转型进程中,国家应在统筹规划、资源配置、体制保障、机制设计、政策配套方面发挥作用,推动职业教育又好又快发展.     

应当重视师范生的信息素养和能力培养

21世纪即将来临，师范计算机教育关系到下一代教师的整体素质，是当前教育改革的重要课题。本文从分析信息时代的教师应该具备的信息养素和信息技术能力出发，剖析了当前师范计算机教育中存在的一些问题，提出了改革的思路和建议。     

钢筋混凝土构造柱在砖砌体结构中的应用

本文结合工程实例，通过对调协钢筋混凝土构造柱的砖砌体结构的作用机理，承载力验算等的分析和探讨，说明了钢筋混凝土构造柱的砖砌体结构中的作用。     

Determining optimal cadence for an individual road cyclist from field data

The cadence that maximises power output developed at the crank by an individual cyclist is conventionally determined using a laboratory test. The purpose of this study was two-fold: (i) to show that such a cadence, which we call the optimal cadence, can be determined using power output, heart-rate, and cadence measured in the field and (ii) to describe methodology to do so. For an individual cyclist's sessions, power output is related to cadence and the elicited heart-rate using a non-linear regression model. Optimal cadences are found for two riders (83 and 70 revolutions per minute, respectively); these cadences are similar to the riders’ preferred cadences (82–92?rpm and 65–75?rpm). Power output reduces by approximately 6% for cadences 20?rpm above or below optimum. Our methodology can be used by a rider to determine an optimal cadence without laboratory testing intervention: the rider will need to collect power output, heart-rate, and cadence measurements from training and racing sessions over an extended period (>6 months); ride at a range of cadences within those sessions; and calculate his/her optimal cadence using the methodology described or a software tool that implements it.     

Effects of load mass carried in a backpack upon respiratory muscle fatigue

Purpose: The purpose of this study was to investigate whether loads carried in a backpack, with a load mass ranging from 0 to 20?kg, causes respiratory muscle fatigue. Methods: Eight males performed four randomised load carriage (LC) trials comprising 60?min walking at 6.5?km?h^?1 wearing a backpack of either 0 (LC₀), 10 (LC₁₀), 15 (LC₁₅) or 20?kg (LC₂₀). Inspiratory (P_Imax) and expiratory (P_Emax) mouth pressures were assessed prior to and immediately following each trial. Pulmonary gas exchange, heart rate (HR), blood lactate and glucose concentration and perceptual responses were recorded during the first and final 60?s of each trial. Results: Group mean P_Imax and P_Emax were unchanged following 60-min load carriage in all conditions (p?>?.05). There was an increase over time in pulmonary gas exchange, HR and perceptions of effort relative to baseline measures during each trial (p?p?>?.05). Conclusions: These findings indicate that sub-maximal walking with no load or carrying 10, 15 or 20?kg in a backpack for up to 60?min does not cause respiratory muscle fatigue despite causing an increase in physiological, metabolic and perceptual parameters.     

矿井多风机风压优化计算机调节系统设计

经过对多风机通风网络分析,利用现有的VNETPC模拟程序,建立了多风机风压优化计算机调节系统.该系统允许计算机自动调整多风机风压,直到各用风地点获得最佳可接受的风量分配为止.     

一种高速网络下分布式入侵检测体系结构的设计与实现

随着网络速度不断提高和规模的快速扩展,对入侵检测系统的模型、结构和实现技术提出了新的需求。在深入分析和讨论现有入侵检测模型和技术优缺点的基础上,针对高速网络的特点,本文提出了一种层次可变的树状分布式入侵检测体系结构。该结构可以根据网络规模的变化动态地进行配置,各节点的增加和删除采取注册和注销的方式,而且树状结构中的每一个独立节点都可视为一个完整的入侵检测系统。利用动态负载均衡与基于协议分析的多模式匹配技术对其进行实现。