应许之地

面对海平面持续上升的危机,本文提出了新型可持续发展城市建设模式,以供参考。     

基于广义S变换奇异值分解的料位回波检测与校正

非平稳及多奇异点的调频料位测量雷达回波中包含虚假回波及噪声,影响料位回波信号检测,导致料位测量精度不高.本文提出了一种基于广义S变换和奇异值分解的料位回波检测与校正方法.首先,将料位变化视作低速运动目标,将料位回波信号与雷达发射信号进行混频解调,并根据回波信号的频率分布特点对广义S变换窗口的变化趋势进行调节.之后对其变换所得到的二维时频系数矩阵利用奇异值分解方法重构系数矩阵,并对其进行广义S逆变换,得到校正后的回波信号.实验结果表明:该方法能够准确检测料位回波信号,在抑制噪声的同时能最大限度保留信号的细节特征,减少虚假回波干扰.料位测量误差不超过4.01％,测量精度可达到0.40％F.S.     

依赖多子群分层混合算法的云计算信息系统安全等级保护测评

基于多子群分层混合算法的云计算信息系统的概念和信息安全等级保护(Information security level protection,ISLP)的基本内涵,研究了云计算信息系统的系统结构和信息处理机制。其中,提出了一种多子群分层混合算法的云计算信息系统信息安全等级保护测评方法,即分布式配置与集中式云计算相结合,及其软硬件框架与感知检测集成,并提出了基于镜头原理的信息处理框架及其接收信息处理的流程。设计了多子群分层混合算法,利用镜头聚焦模型和五个阶段的信息处理序列,建立并解析了云计算的工作规律及其自反馈调整,验证了所提出思想的合理性和优势。     

浅析伺服液位计在乙烯丙烯球罐的应用

本文以E+H公司生产的NMS 5型伺服液位计为例,介绍了伺服液位计的工作原理、特点及故障处理方法。对伺服液位计在乙烯丙烯球罐维护过程中所出现的故障和发现的问题进行了详细阐述,提出了储存乙烯丙烯球罐使用伺服液位计在安装、选型和维护过程中的注意事项,通过在乙烯丙烯球罐应用实践,证明伺服液位计的稳定性和可靠性。     

Contour‐based polygonal ambient occlusion using a single‐depth texture

We present a novel approximation of a global illumination technique called contour‐based polygonal ambient occlusion, an approach that darkens by only using a depth texture as screen‐space ambient occlusion without additional information such as a normal buffer. We introduce a discrete level structure to calculate the amount of occlusion by using the contour level, an integer value derived from the depth difference of neighboring texels. We use the uniform sampling to define the positions of the neighboring texels in the depth texture. Our method does not depend on geometric complexity because our method works in screen space and works well for both static and dynamic scenes without any precomputation. Copyright © 2013 John Wiley & Sons, Ltd.     

The environmental perception and behavioural approach in planning

A brief review of criticism in certain areas of planning seems to indicate the need for the adoption of an environmental perception and behaviour approach. The conceptual basis of this approach is established leading to the development of a paradigm of the man‐environment relationship based on perception, which in turn provides the central feature of a model of human spatial decision‐making behaviour. Mental images of the environment are postulated as forming the core determinants or influences of human spatial behaviour. Results of empirical studies using this approach can outline the significant factors in human decisions and views concerning the environment. The value of the approach is that it emphasises the relativity of mental images in all stages of the planning process and that it links planning decision‐making to a more realistic paradigm of man‐environment relationships. Some examples of the application of this approach to specific areas of planning are given.     

Strategies in environmental education

The causes of environmental changes, including climate, are neither fully understood nor identified, nor do scientists agree about their nature. Yet, their impact is such that action cannot be delayed. This involves spreading public awareness through environmental education and sensitization. Hence a need to reach, to educate the poorly informed public at large. With the classroom as the base, “town meetings” and eco‐tourism may constitute potentially useful approaches towards that goal.     

防恐建筑结构抗爆防护分类设防标准研究

针对我国尚未制订建筑结构抗爆防护设防标准,制约建筑结构抗爆设计工程应用的现状,研究了适合我国国情的建筑结构抗爆防护分类设防标准。对已发生典型爆炸袭击事件的规模进行了统计分析,确定了建筑结构的抗爆设防烈度;总结爆炸作用下建筑结构破坏特点,确定了建筑结构抗爆防护目标;基于抗爆设防烈度和抗爆防护目标,提出了建筑结构的抗爆防护等级。将建筑结构进行类别划分,确定了不同类别建筑结构的抗爆重要性等级;考虑主要影响因素,确定了建筑结构的爆炸易损性等级;采用风险分析的方法提出了建筑结构的爆炸风险等级。依据抗爆防护等级和爆炸风险等级,建立了建筑结构的抗爆设防标准。基于建筑结构抗爆重要性等级,提出了建筑结构的抗爆设防类别,进而建立了建筑结构的抗爆分类设防标准。     

特色校园的塑造———浅析福州一中新校区设计

本文以福州第一中学新校区设计为例,从基地的自然环境入手,从学校的历史入手,提出了从建筑布局．山水校园,古朴风格,多元空间等几个方面来打造富有特色的校园建筑。     

CECS 160:2004和GB 50011-2010抗震设计若干问题对比分析

抗震设计发展趋势是基于多目标的性态设计.为适应将来抗震设计理念,通过对《建筑工程抗震性态设计通则(试用)》(CECS 160:2004)及《建筑抗震设计规范》(GB 50011-2010)两部规范中设防水准、设防目标、地震作用计算、变形限值等方面对比分析,指出两部规范的异同点,并得出按照CECS 160:2004规范计算的结构总水平地震剪力标准值高于按照GB 50011-2010计算的结果,甲类建筑甚至高出一倍以上等结论,为从事工程抗震设计和工程抗震研究的人员提供一定的参考和借鉴.