走航式ADCP在感潮河段流量监测中的应用

在感潮河段受上游径流、潮汐的影响,水位、流速变化较快,水文现象极为复杂。采用传统的常规测验方法验证代表线,劳动强度较大,效率低下。而走航式ADCP(声学多普勒流速剖面仪)除可以快速测量断面流量外,也可以定点(固定垂线位置)通过WinRiver软件中的命令控制ADCP定时按时长获取垂线(代表线)流速、流向,应用上述方法在北江石角站完成感潮河段的流量连续测验,取得良好的效果,从而为感潮河段流量连续监测提供了一种新的手段。     

环渤海地区滨海盐碱地不同排盐处理下的台田降盐效率

本文以环渤海区域河北省黄骅市中捷农场的盐碱荒地为研究对象,采用台田-浅池土地利用新模式,同时在台田底部设计了4种脱盐工程处理,通过分析2年各底部排盐措施的排盐效果,得出结论:不同底部排盐措施处理下,经过两年种植后的台田土壤表层、耕层以及1m土体的脱盐情况以底部弧形覆膜+埋设排盐暗管排盐措施最为明显,1m土体脱盐率达35.6%;底部苇把+棉花秆覆盖处理也有较好脱盐效果,脱盐率为25.6%;底部弧形覆膜+耕层地秸秆覆盖处理1m土体脱盐率为20.4%;这3种处理具有相同脱盐特征,均为表层1m土体耕作层;底部铺设苇板处理和对照处理土壤盐分未降反增,且增加情况为耕层1m土体表层。初步证明修建台田时,台田底部采用弧形覆膜+埋设排盐暗管的排盐措施可有效加快台田土壤排盐速度,达到改良盐碱荒地土壤目的。     

Effect of ethanol on liver antioxidant defense systems: Adose dependent study

Alcohol induced oxidative stress is linked to the metabolism of ethanol. In this study it has been observed that administration of ethanol in lower concentration caused gain in body and liver weight. while higher concentration of ethanol caused lesser gain in body and liver weight. Ethanol treatment enhanced lipid peroxidation significantly, depletion in levels of hepatic glutathione and ascorbate, accompanied by a decline in the activities of glutathione peroxidase and glutathione reductase, and increased in hepatic glutathione s-transferase activity. Interestingly catalase activity increases in lower concentration of ethanol exposure, and decreased in higher concentration. Superoxide dismutase activity was also increased on ethanol exposure. But, ethanol feeding did not show any effect on glucose-6-phosphate dehydrogenase activity. Ethanol ingestion perturbs the antioxidant system in a dose and time dependent manner.     

论苏中地区近代报刊事业的“黄金期”（1919—1937）

＂五四运动＂后,苏中地区的近代报刊事业无论是从其数量,还是从其质量上而言,皆有明显的进步,出现了发展的＂黄金期＂,其势头延续到抗战全面爆发的前夕。其发展具有区域性的特征,也受时代因素影响。     

我国海洋潮汐能领域专利竞争态势分析

利用中国专利数据库,检索了357件潮汐能相关专利并进行了定量和定性分析,从专利的数量发展趋势、国别及省市分布、专利申请类型、法律状态、技术领域等多个角度,综合分析了我国潮汐能领域专利技术发展状况。结论:我国潮汐能专利的主要申请人是个人、高校和研究所,潮汐能技术专利申请密集区是F03B13,英美等国已在我国进行专利布局。根据研究结果,提出了我国潮汐能的发展建议。     

采用绝缘体上的半导体技术制备集成的多模干涉型光耦合器和光开关

在光学系统中,SOI(绝缘体上的半导体)上制备集成的MMI(多模干涉)型光耦合器已成为一种愈来愈引人注目的无源器件.由于Si和SiO2 之间具有大的折射率差,在SOI波导中可以采用SiO2 薄膜( <1.0 μm)作限制层,这与超大规模集成电路工艺相兼容.描述了采用SOI技术制备集成的MMI型光耦合器和光开关的设计和制造结果.业已证实,2× 2MMI MZI(多模干涉 麦赫 曾德干涉)型热光开关的开关时间小于 2 0 μs.     

论组织文化的结构

本文提出了一个群体或一个组织的文化是由无数个由该群体所遵循、所认同、所继承、所教化的文化现象所构成的，然后从文化现象形成的角度论述了组织文化应该包含有理念、制度、个性和背景等四个层面，并进一步阐明了这样划分的理由。最后给出了几点结论和建议。     

模范员工与反生产行为——自我控制的视角

模范员工一定会做出有利于组织的行为吗？实际上,出于印象管理动机的模范员工极有可能做出反生产行为,其中自我控制资源发挥着关键作用。本文以自我控制资源理论为基础,采用工作日志的调查方法,收集了121个员工的数据,包括121份个体之间数据和1210份个体内部的数据,探讨印象管理中员工的模范策略对反生产行为的影响及自我监控的调节作用。研究结果表明,模范策略通过自我控制资源损耗的中介作用对反生产行为产生正向影响;自我监控在模范策略促进自我控制资源损耗的过程中具有调节作用,在高自我监控的情况下,模范策略对反生产行为的正向影响减弱,在低自我监控的情况下,模范策略对反生产行为的正向影响增强。     

内容安全研究进展与教学内容选择

内容安全是物理安全、运行安全、数据安全之上的信息安全技术,要面对和解决这三层没有解决的安全问题。文章在研究分析国内外内容安全研究进展情况基础上,指出目前内容安全主要包括不良代码过滤、不良信息过滤与监管、数字媒体版权保护等三方面内容。结合现阶段我国信息安全专业改革和课程设置的情况,给出了信息内容安全课程的六部分教学内容,即内容安全概论、隐写及其分析技术、数字水印技术、数字权益管理、网络信息获取与识别、基于内容的管控等。     

双参数地基上土钉墙面层土压力计算

土钉墙面层承受部分土(水)压力,文中把土钉墙面层看作是弹性地基上的有限长梁,在试验的基础上,推导了基于双参数地基的成层土层分布的土钉墙面层在土钉拉力作用下的挠曲线、转角、弯矩和剪力方程,并与实测数据进行了比较分析,验证了模型的合理性,得到的解析解基本上可以反映土钉墙面层土压力的分布.在此基础上,探讨了不同土性土层中土钉墙面层土压力的分布.面层土压力在土层的分界面上位移连续土压力突变;作用在软弱土层的面层土压力比硬土层上的面层土压力大;上软下硬型较上硬下软的土层分布更能使面层土压力得到充分发挥;同时文中计算了面层土压力换算成荷载与土钉拉力的比值,面层对于土压力的作用随着深度的增加表现得愈加明显,提出针对不同地区不同深度和不同土性条件下应给出比值的建议值,以使土钉墙的设计更符合其真实的作用机理.文中得到的结论和计算方法对于进一步研究土钉墙的作用机理及设计中如何充分发挥面层的作用等具有重要的理论意义和实际应用价值.     

A Case of Severe Ovarian Hyperstimulation Syndrome

Ovulation induction has been an important mode of treatment of infertility. Ovarian stimulation may result in a supraphysiologic response leading to an iatrogenic complication known as the ovarian hyperstimulation syndrome (OHSS). This syndrome is potentially a lethal condition, the pathophysiologic hallmark of which is the accumulation of massive extravascular exudate combined with profound intravascular volume depletion and hemoconcentration. We report a case of severe OHSS with very large ovaries in a 35 year old case of embryo transfer. The patient presented to the emergency department with abdominal pain, massive ascites, respiratory distress and amenorrhea. The patient was managed symptomatically with no complications. Although ovarian hyperstimulation is a rare entity, it is important that the physician recognizes this condition. Prompt diagnosis and successful management is likely to avoid serious and rapid development of complications.     

The content of productivity growth in Swedish manufacturing

It is hardly surprising that the slowdown in economic growth throughout the industrial world in the last decade has attracteda lot of attention by economists. The decline in productivity growth has been a special object of study. However, the causes of this decline still largely remain a mystery. In the present paper it is suggested that a more micro-based approach to the problem than the conventional macro-oriented growth accounting method yields additional insights. A methodology is outlined which can at least complement the conventional approach and which is specially designed to open the way for micro analysis of productivity change without losing sight of the macro side. This is done by first breaking down total factor productivity growth through disaggregation to lower and lower levels of observation in order to separate out structural from “purely technical” changes. Then framework is presented for analyzing how productivity changes at the micro level can be aggregated to the macro level. The results emphasize the importance of economies of scale and resource allocation.     

Low cost fabrication and assembly process for re-usable 3D polydimethylsiloxane (PDMS) microfluidic networks

A method to easily manufacture and assemble a polydimethylsiloxane (PDMS) based microfluidic device is described. The method uses low cost materials and re-usable laser cut polymethyl methacrylate (PMMA) parts. In addition, the thickness of PDMS layers can be controlled and both PDMS layer surfaces are flat, which allows for multi-layer PDMS structures to be assembled. The use of mechanical clamping to seal the structure allows for easy cleaning and re-use of the manufactured part as it can be taken apart at any time. In this way, selected layers can be re-used or replaced. The process described can be easily adopted and utilised without the need for any costly clean room facilities or equipment such as oxygen bonders, making it ideal for laboratories, universities, and classrooms exploring microfluidics applications.     

Tide–surge interaction model including air bubble effects for the coast of Bangladesh

An estimate of water levels due to the interaction of tide and surge associated with a storm including air bubble effects is made along the coastal region of Bangladesh. For this purpose, a vertically integrated shallow water model in Cartesian coordinate system is developed introducing air bubbles and is solved using nested finite difference schemes. A fine grid model covering the region between 21°15′N to 23°N and 89°E to 92° E has been nested into a coarse grid model covering the region between 15°N to 23°N and 85°E to 95°E in the Bay of Bengal to incorporate all the major islands and coastal bending accurately. By applying tidal forcing through the southern open boundary of the coarse grid model appropriate tidal conditions are generated in the problem domain. Numerical experiments are performed with the help of the model to simulate water levels due to tide and surge interaction including air bubble effects associated with the tropical storm of April 1991. The model results are found to be reasonable and the model can be found to simulate higher water levels in the presence of air bubbles.     

Torsion of a Laminar Composite Debonded Over a Penny-shaped Area

The effect of an imperfectly bonded laminar composite is examined in terms of the intensification of the torsional stresses operative near the imperfection which is assumed to be a circular shaped area. The laminar composite is modelled by four layers of different materials with the two outer layers being infinite in height and debonding occurs at the interface of the two inner layers. The analysis based on the application of Hankel transforms and the solution of a pair of dual integral equations can be easily extended to a multilayered system. Depending on the size of the layer thickness relative to the radius of the debonded area, delamination may take place either in a stable or unstable fashion. The analytical results also indicate that the influence of lamination tends to lower the stress intensity around an interface imperfection as compared to the stress state in a homogeneous solid containing the same imperfection. Numerical results are obtained for two special laminate geometries and discussed with reference to the pertinent parameters used in the current theory of fracture mechanics.     

我国政府信息公开纵向透视

政府信息自政府产生之日起就客观存在了，但政府信息公开却是近期才成为社会趋势，成为一种不可逆转的潮流。笔者根据历史发展的时间序列和近年来对政府信息公开方面知识的研究认为，到目前为止，我国的政府信息公开大致经历了以下几个历史时期：封闭-愚民、保密-安民、半公开-廉政、公开-服务。     

南四湖湿地土地利用格局演变与生态效应

以南四湖湿地为研究区,选取1980-2012年间的5期遥感、土地利用等数据,在RS、GIS技术支持下,运用土地利用动态度模型和马尔科夫模型(Markov)分析研究区1980-2012年土地利用格局变化情况,采用生态系统服务价值评价方法,分析土地利用格局变化引起的生态效应。结果表明:①1980-2012年南四湖土地利用动态度分析得出:1980-2012年南四湖地区总体的土地利用变化速度较为缓慢,其中1990-2000年南四湖综合土地利用动态度最大,变化速率最快为1.84%;南四湖地区各土地利用类型动态度变化最快的是滩涂沼泽和未利用地;②1980-2012年南四湖土地利用格局结构变化特点是:其他农用地增加幅度为223.65%,主要是由于水产养殖业蓬勃发展,农业产业结构发生变化;建设用地面积增加较大,主要受城市化的影响;其他用地面积减少,转化为耕地和其他农用地;③1980-2012年南四湖湿地地区生态服务价值不断减少,负向贡献率大于正向贡献率,滩涂沼泽和水域面积减少是引起南四湖湿地地区生态价值减少最关键的因素。     

浅析基于ARP网络嗅探的防范技术

嗅探是对较底层网络基础设施的安全威胁,这层支持使用互联网的应用程序。用户并不直接与这些底层打交道,通常完全不知道它们的存在。如果不对这些威胁进行审慎考虑,就不可能在高层构建有效的安全保障。     

Galileo's tidal theory

The aim of Galileo's tidal theory was to show that the tides were produced entirely by the earth's motion and thereby to demonstrate the physical truth of Copernicanism. However, in the Dialogue Concerning the Two Chief World Systems Galileo did not explain some of the most significant aspects of the theory completely. As a consequence, the way the theory works has long been disputed. Though there exist a number of interpretations in the literature, the most widely accepted are based on ideas that are not explicitly articulated by Galileo in the Dialogue. This essay attempts to understand the way the theory functions in terms of Galilean physics. It is an interpretation of the theory based solely on Galileo's arguments--and one that reveals it to have had some unrecognized consequences. This interpretation indicates that Galileo's theory would not have worked in the manner he described in the Dialogue.