Benefits of Flow Data for Flood-Protection Design

Stream gauging data play a vital role in the planning of flood mitigation strategies. A study of the value of stream flow data for the design of levee systems shows that the availability of a reasonable sample of pertinent data can be worth many times the cost of collecting that data.     

Buckling behavior of cold-formed zed-purlins partially restrained by steel sheeting

This paper presents a study on the buckling behaviour of purlin-sheeting systems under wind uplift loading. The restraint provided by the sheeting to the purlin is modeled by using two springs representing the translational and rotational restraints. The analysis is performed using finite strip methods in which the pre-buckling stress is calculated based on the same model used for the buckling analysis rather than taken as the ‘pure bending’ stress. The results obtained from this study show that, for both local and distortional buckling, the restraints have significant influence on the critical loads through their influence on the pre-buckling stress rather than directly on the buckling modes. While for lateral-torsional buckling, the influence of the restraints on the critical loads is mainly due to their influence on the buckling modes rather than the pre-buckling stress.     

Reactivation and growth of non-culturable indicator bacteria in anaerobically digested biosolids after centrifuge dewatering

Recent literature has reported that high concentrations of indicator bacteria such as fecal coliforms (FCs) were measured in anaerobically digested sludges immediately after dewatering even though low concentrations were measured prior to dewatering. This research hypothesized that the indicator bacteria can enter a non-culturable state during digestion, and are reactivated during centrifuge dewatering. Reactivation is defined as restoration of culturability. To examine this hypothesis, a quantitative polymerase chain reaction (qPCR) method was developed to enumerate Escherichia coli, a member of the FC group, during different phases of digestion and dewatering. For thermophilic digestion, the density of E. coli measured by qPCR could be five orders of magnitude greater than the density measured by standard culturing methods (SCMs), which is indicative of non-culturable bacteria. For mesophilic digestion, qPCR enumerated up to about one order of magnitude more E. coli than the SCMs. After centrifuge dewatering, the non-culturable organisms could be reactivated such that they are enumerated by SCMs, and the conditions in the cake allowed rapid growth of FCs and E. coli during cake storage.     

Surveillance for the masses: the political and legal landscape of the UK Investigatory Powers Bill

In March 2016, the UK Government put the Investigatory Powers Bill before Parliament. The new law, if enacted, will considerably increase the powers of law enforcement and security services regarding mass data retention, mass surveillance and mass hacking. This raises considerable concerns not just about the content of the Bill and its impact on privacy, but also about the method of its enactment and the ever diminishing parliamentary and judicial scrutiny of surveillance legislation in the UK.     

DEVELOPMENT TOOL FOR COMPUTER VISION SYSTEMS AT PIXEL LEVEL

This paper describes a tool to aid the development of computer vision applications for pixel-level diagnosis. A conceptual framework for constructing pixel processors is described. The proposed tool is based on two domains: one deals with numerical images, named features, and the other deals with symbolic images, named classes. A reduced set of image and operator types is defined. Based on it, an object-oriented language is described. The main objects define features and classes and their associated operators, namely procedures, classifiers, and rules. All system control is goal oriented and is designed to provide symbolic images as results when a request is received from a higher level of the image understanding system. Some knowledge engineering concepts, such as certainty control and instances, are also included.     

基矛电磁波的低流速测量中干扰因素分析研究

介绍了电磁渡测量流速的基本原理一多普勒效应．分析了影响低流速测量的主要干扰因素一发射泄漏干扰和旁瓣干扰。根据接收信号中发射泄漏干扰不变的特性,提出了去均值滤波的方法来消除干扰,对数据进行预处理;根据旁瓣干扰的信号特性,提出了通过频谱加窗和二次加权平均法构造频域带通滤波器来抑制干扰的方法,在仿真比较完各个窗函数的性能之后...     

单层钢板组合剪力墙的弹塑性研究

单层钢板组合剪力墙是一种很好的抗侧力构件,在高层建筑中得到广泛应用。文章利用ANSYS对单层钢板组合剪力墙进行弹塑性分析,考察了不同参数的变化对其抗侧性能的影响,并得出相应结论。     

乳化硅油增强提质褐煤型煤防水性的研究

针对部分提质褐煤型煤防水性差的缺点,制备乳化硅油作为型煤的防水剂,在硅油乳液的制备过程中,最佳亲水亲油平衡值(HLB)为10.5,硅油与乳化剂的最佳质量比为4∶1,最佳乳化方式为转相乳化法。试验结果表明:乳化硅油作为防水剂可大幅度增强提质褐煤型煤的防水性,3种不同质量分数的硅油乳液(5%、10%、30%)分别可使原本不具有防水性的型煤60 m in的平均吸水率降至6.98%、5.51%和1.98%。     

合成抗菌肽TachyplesinⅠ的体外生物活性及其降解规律

目的探讨合成抗菌肽TachyplesinⅠ在体外的生物活性及在模拟消化环境中的降解规律。方法采用不同温度、pH值、阳离子浓度、溶剂极性、模拟消化环境分别处理TachyplesinⅠ,通过检测TachyplesinⅠ生物活性的变化分析其稳定性;检测TachyplesinⅠ对小鼠血细胞的溶血活性;通过HPLC图谱变化评定TachyplesinⅠ在模拟消化环境中的降解情况。结果 TachyplesinⅠ在低于100℃、pH值小于10.3的情况下具有稳定性,阳离子浓度和溶液极性对TachyplesinⅠ的抗菌活性具有一定影响;在TachyplesinⅠ浓度大于80 mg/L时,作用时间大于30 min时,表现出一定的溶血活性;TachyplesinⅠ在模拟胃液、胃黏膜匀浆和血浆系统中表现出很高的稳定性,色谱峰型基本未改变,几乎无降解作用,TachyplesinⅠ的最小抑菌浓度为5.0～20.0 mg/L;在模拟小肠液和小肠黏膜匀浆系统中稍微敏感,色谱峰型降低,出现小杂峰,生物活性明显降低,最小抑菌浓度在80～160 mg/L之间。结论 TachyplesinⅠ具有较强的高温耐受性,在酸性条件下稳定,同时具有一定的耐受体内蛋白酶降解的能力。