桂林市住宅小区雨水利用方案设计与技术经济分析

为桂林市某住宅小区设计一套雨水利用系统 ,以满足小区内浇洒道路、绿化、洗车之用。住宅小区占地4 0 4 4 0 4 m2 ,总建筑面积 1 1 1 6 1 0 m2 ,绿化覆盖率为 6 2 % ,道路占总用地面积的 1 0 %。水处理工艺流程为 :雨水→沉淀池→石英砂过滤池→蓄水池。调节池 2座 ,单池容积为 7× 1 0 3m3。方案的技术经济分析表明 ,全年可节余自来水 1 .6 96× 1 0 5m3,静态投资回收期为 8.0 5 a     

防御虚假数据注入攻击的多目标优化模型

随着智能电网的快速发展,虚假数据注入(false data injection, FDI)攻击已经成为未来电力系统运行面临的主要威胁之一。攻击者通过篡改系统原始数据,导致电力系统失负荷(loss of load demand, LoLD),甚至引发级联失效。因此,有必要建立一种成本效益机制来减轻FDI攻击造成的LoLD。提出了一种多目标风险规避优化模型,在FDI攻击的防御成本、电力系统运行网损和LoLD之间进行权衡。采用多目标进化捕食策略对多目标模型进行求解,获取多目标优化Pareto最优解。仿真结果在IEEE 30节点电力系统证明了所提模型的有效性,并且揭示FDI攻击下电力系统运行中存在着较高的LoLD风险。     

ARO型四臂锚杆钻车用新型干式吸尘钻杆的研发

针对ARO型四臂锚杆钻车所需的国产Ф22×5-2200、2500 mm干式吸尘回转钻杆的弹性不足、质量波动大、出现早期断裂和弯曲的问题,经多次现场试钻调查和残体分析,并结合所积累的信息和经验,从Ф22×5 mm管坯以及钻杆的几何结构参数、钢种、钢质标准、钢管冶轧工艺、钻杆制造工艺(含机加工、热处理、表面强化)和使用技术等6个方面,进行了系统地创新和改进,机械性能与质量稳定性全面提升.     

试析家族企业低成本运作之优势

家族企业有多方面的管理优势，特别在家族企业的发展初期表现更为明显。建立在血缘、亲缘基础上的组织结构，保证了企业管理的低成本运作；产权清晰、目标明确降低了企业的激励成本；家长集权制有利于降低决策、协调成本；关系式治理则节约了监督成本。成本降低的直接结果是大大提高了企业的竞争力，使家族企业成为有效率的经济组织。     

生物絮凝剂产生菌的筛选及性能研究

从林下土壤中筛选得一株产絮凝剂的细菌XMX-1(其产生的絮凝剂命名为XMX-1F);研究结果表明：玉米淀粉、玉米浆是廉价的碳氮源;探讨了在絮凝体系中,影响絮凝效果的因素。通过乙醇提取的方法,从发酵液离心后的上清液中获得絮凝剂粗产品7.685g/L;通过蒽酮反应、紫外扫描以及红外扫描等多种方法手段分析确认XMX-1F是以多糖为主的高分子絮凝剂,多糖含量为77.87%,且具有较高的热稳定性;在实际废水处理方面,XMX-1F对洗煤废水、泥浆废水以及活性炭悬液等有悬浮颗粒的废水处理效果明显,但脱色效果不明显,通过XMX-1F对模拟洗煤废水的应用研究表明,其应用到处理实际洗煤废水中的前景是可观的。     

Reptile distribution may identify terrestrial islands for conservation: the Levant’s ‘Arava Valley as a model

Widely accepted major criteria for biodiversity hotspots that deserve conservation include species richness, endemism and threat. Proving that a taxon is endemic to a given area is more difficult, and therefore expensive, with animals than with plants because of the difficulty to prove absence outside the known distribution. Seeking a cost-efficient practical method to show animal endemism while funds necessary for conventional demonstration of endemism are lacking, we argued that when the known distribution of a suspected endemic taxon coincides with an eco-geographically isolated area, e.g. island, its exclusivity to that area is more credible. We selected a model site containing suspected endemics, the ‘Arava depression (altitude - 400–0 m) between arid southern Israel and southern Jordan. A search of the literature and collections found at least 23 animal taxa endemic to the ‘Arava, to the adjacent Dead Sea basin sharing the depression, or to both. We assessed the level of isolation of the ‘Arava depression by statistically analysing the geographical distribution of taxa (species or subspecies) of one selected well researched model group, Squamata (lizards and snakes). In northern Israel and Jordan the squamate faunas of the two countries are very similar. In contrast in the south where the ‘Arava intervenes, the two faunas greatly differ. The ‘Arava both constitutes a partial barrier and is partly isolated. Hence its apparent endemics are likely real endemics, inviting conservation of the area. The more so since the ‘Arava is also an arena of much research and education. Our methodology may serve worldwide to identify semi-isolated terrestrial areas for conservation.     

渤海经济型抗冰结构全寿命设计框架

渤海经济型抗冰结构基本设计中存在很多缺陷,在服役期间承受着各种风险,必须从以往重点关注平台施工完成状态拓展到规划、设计、施工、管养等结构的整个寿命周期过程．提出了渤海经济型抗冰结构的全寿命设计框架,包括选型设计、性能设计、管养设计．通过对现有规范要求及基本设计的研究,突出结构抗冰性能要求,采用合理的管养,对全寿命成本效率优化设计框架进行评价,设计结果可使寿命周期内结构风险最低．