厦门市汀溪灌区总干渠洪水复核方法探讨

汀溪灌区作为汀溪水库群的农业供水对象,其灌溉用水量的大小直接关系到汀溪水库群向翔安、同安两区的水资源供需平衡,甚至影响厦门市水资源配置方案。但由于灌溉面积和渠道功能发生变化,有必要进行洪水分析复核从而重新确定工程规模。本文对汀溪灌区总干渠洪水复核方法进行探讨,供参考。     

Determination of the normal horizontal working area: a new model and method

A new model was developed for the determination of the normal horizontal working area by extending Squires' concept. The elbow not only moves freely straight ahead, but also to the right and left of the operator in describing the working area. The parametric equations developed in this research enabled us to determine working area curves which lie on both sides of the body median. Experimental results showed that the relevant anthropometric parameters were poorly correlated. A new method was developed to determine correctly the normal horizontal working area curves for the 5th, 50th, and 95th percentiles of male and female populations. When compared to the corresponding curve generated by the new method, Squires' curve for the 10th percentile male considerably overestimated the normal horizontal working area to the right of the body median and underestimated it to the left.     

Maintenance of postharvest quality and bioactive compounds of fresh‐cut sweet leaf bush (Sauropus androgynus L. Merr.) through hot CaCl2 dips

The effects of hot CaCl₂ dips on postharvest quality and bioactive compounds of fresh‐cut sweet leaf bush were investigated. The vegetable was dipped in 0.5% or 1.0% (w/v) of CaCl₂ solutions at 40 °C for 30 s and the control was the untreated sample. Hot CaCl₂ dips significantly delayed the weight loss, maintained the overall quality and inhibited the wiltness (P < 0.05). Both hot CaCl₂ dips had no effect on the changes in lightness (L*) and delayed the decrease in greenness (‐a*) and total chlorophyll content and the increase in both yellowness (b*) and carotenoid content. Hot CaCl₂ dips enhanced total antioxidants, total phenolics content and both AsA‐POD and G‐POD activities from 38.6, 0.44, 15.2 and 22.4 at day 0 to 55.3, 0.55, 50.5 and 362.4 at day 8, respectively. Moreover, hot CaCl₂ dips also delayed the loss of DPPH free radical scavenging activity, total flavonoid, ascorbic acid and CAT activity when compared to other treatments during storage. This study showed that hot CaCl₂ dip maintains postharvest quality and enhanced bioactive compounds of fresh‐cut sweet leaf bush during storage.     

岩溶地面塌陷区地质灾害治理及桩基设计探究

对徐州岩溶地区高层建筑的地面塌陷情况进行了分析,并对软土地区桩基设计计算方法、地基模型及桩基沉降变化模型作了详细探究,从而使桩基设计技术更加完善。     

节能示范区公共设施建设管理问题研究

节能示范区是低碳经济发展过程中的阶段性产物,而节能示范区的低碳节能的公共设施管理已经成为迫切需要解决的重要问题。通过节能示范区公共设施建设管理和使用中存在的问题分析,探讨解决方法与途径。     

Packing equal circles into a circle with circular prohibited areas

The paper considers the problem of packing a maximal number of identical circles of a given radius into a multiconnected domain. The domain is a circle with prohibited areas to be finite unions of circles of given radii. We construct a mathematical model of the problem and investigate its characteristics. The starting points are constructed in a random way or on the ground of the hexagonal lattice. To find the local maxima, a modification of the Zoutendijk method of feasible directions and a strategy of active inequalities are applied. We compare our results with the benchmark instances of packing circles into circular and annular containers. A number of numerical examples are given.     

On the formation mechanisms of fine granular area (FGA) on the fracture surface for high strength steels in the VHCF regime

The fine granular area (FGA) plays a crucial role in the VHCF regime. However, so far, the uniform understanding or conclusion about the formation mechanism of FGA has not been drawn. In view of the significance of FGA, the current studies on FGA, i.e., the FGA size, the stress intensity factor range at the periphery of FGA, the crack initiation and growth process in FGA, and the formation mechanisms of FGA, are reviewed in the present paper. The role of internal hydrogen in the VHCF regime is further discussed. In the end, two important definite conclusions are drawn based on the present investigations.     

复采工作面火灾事故案例分析与综合防治

以小煤矿严重破坏区复采综放工作面3起火灾事故为案例,分析火灾原因,提出了复采工作面穿越小煤矿破坏区特殊支护、消火道防灭火等防治小煤矿自然发火技术,结合工作面破坏区灌浆超前防治、局部均压、注氮等防灭火措施,有效地消除了火灾事故,确保工作面顺利回采。     

基于动态策略的移动警务终端安全管控系统的设计与实现

对移动警务安全接入平台中的终端设备的安全防护问题进行了研究,提出并研制了一种基于动态策略的移动警务终端安全管控系统,整个系统由客户端、前置服务端和内网服务端组成,前置服务端和内网服务端分别部署在前置区和公安内网,客户端部署在移动终端设备上,确保在移动接入区和公安内网区有效进行物理隔离的前提下,将系统制定的各种安全策略规则下发到客户端执行,规范用户对移动终端的本地软硬件资源和网络资源的使用,实现安全威胁检测、防护及预警,对移动终端用户的违规访问、操作行为进行全面监测和上报,实现终端设备安全和行为的统一管理.