基于模式识别的智慧青城山——都江堰景区安全防范系统

在讨论基于模式识别的视频分析技术原理的基础上,阐述了运用动态视频分析的运动识别技术构建景区智能安防体系的实现方式,分析了该技术的应用场景、计算规则和软件部署方式等.通过智慧青城山——都江堰景区安全防范系统中对这一技术在人数统计、周界防范、人群控制、森林防火、交通诱导等方面的成功运用,证明这些技术可以有效解决景区安全防范工作中的现实问题,能够显著提升智慧景区的安全防范能力和精细化管理水平.     

可持续管理——风景管理的科学之路

在IUCN伞球自然保护系统中,中国的风景名胜区在人口、体制、资金、文化、利益主体、地域关系上有很多独特性,风景旅游游憩与社区发展是当前风景名胜区面临的众多矛盾的直接动因,对保护与发展适宜度缺乏科学评价标准是目前众多矛盾难以解决的根本原因之一;从基于审美价值的规划理论方法走向基于自然科学价值、历史文化价值、审美价值、游憩价值等全面的综合规划与管理.是实现风景区可持续管理的关键,也是对风景科学与风景区规划理论和方法的深化.可持续管理制度是保持风景区保护与发展动态平衡的重要机制,游憩适宜性评价、生态影响评价、社区可持续性评价、可持续管理规划、风景动态监控系统是风景区日可持续管理的5个关键技术.     

探讨新农村规划——以平江县盘石寨规划设计为例

遵循新农村居民点建设应达到"布局合理、用地经济、设施完善、生活方便、便于管理、环境优美"的要求,结合岳阳市平江县盘石寨规划设计实例,较为详细的介绍了它的设计原则和总体布局。     

Mesostructured Arrays of Nanometer‐spaced Gold Nanoparticles for Ultrahigh Number Density of SERS Hot Spots

A novel one‐trough synthesis via an air‐water interface is demonstrated to provide hexagonally packed arrays of densely spaced metallic nanoparticles (NPs). In the synthesis, a mesostructured polyoxometalate (POM)‐silicatropic template (PSS) is first self‐assembled at the air‐water interface; upon UV irradiation, anion exchange cycles enable the free‐floating PSS film to continuously uptake gold precursors from the solution subphase for diffusion‐controlled and POM‐site‐directed photoreduction inside the silica channels. NPs ≈ 2 nm can hence be homogeneously formed inside the silica‐surfactant channels until saturation. As revealed via X‐ray diffraction, small‐angle X‐ray scattering (SAXS), grazing incidence SAXS, and transmission electron microscopy, the Au NPs directed by the PSS template are arrayed into a 2D hexagonal lattice with inter‐channel spacing of 3.2 nm and a mean along‐channel NP spacing of 2.8 nm. This corresponds to an ultra‐high number density (≈10¹⁹ NPs cm^?3) of narrowly spaced Au NPs in the Au‐NP@PSS composite, leading to 3D densely deployed hot‐spots along and across the mesostructured POM‐silica channels for surface‐enhanced Raman scattering (SERS). Consequently, the Au‐NP@PSS composite exhibits prominent SERS with 4‐mercaptobenzoic acid (4‐MBA) adsorbed onto Au NPs. The best 4‐MBA detection limit is 5 nm , with corresponding SERS enhancement factors above 10⁸.     

测量高斯光分布半宽度的光电共轭方法

测量光电信号与参考光电信号来自同一光电器件,形成一对共轭函数。调整参考光电信号 放大器的正电源电平,使之等于测量信号的峰值,此时两函数共轭交点之间的距离即对应于光束的半宽。测量过程中,被测光束能量的缓慢变化并不对结果造成影响,因此稳定性较好,实验重复精度至±2mm。     

What role for contact spots and dislocations in friction and wear?

Sixteen years of research on the properties of 'contact spots' of ductile materials in 'adhesive' wear are surveyed. They are the locations (typically occupying less than 1% of the macroscopic area of contact) at which solids ale in load-bearing contact during wear. Their properties determine the coefficient of friction, and friction and Joule heat are generated at them. It was found that the mechanical behavior of contact spots is governed by ordinary dislocation plasticity. They remain elastic if the local pressure falls short of the indentation hardness of the softer side. In that case (almost) no wear occurs. Elastic contact spots are promoted by light loads and fine polishing. Ordinarily, wear particles are detached through tangential shearing-off where, statistically, the two sides at contact spots momentarily interlock. The Holm-Archard wear 'law' is a simple direct result of this mechanism. However, quite typically the bulk of sliding takes place within adsorbed moisture films which are ubiquitous in our daily surroundings. Outside of contact spots the adsorbed moisture behaves much like ordinary water. At the typical contact spot the moisture is squeezed down to but two monomolecular layers; and the relative motion between sliding solids overwhelmingly takes place between these. This causes the prevalence of friction coefficients about μ 0.3 in our surroundings. The complex behavior of the adsorbed water can cause stick-slip. As water is desorbed at 170 °C, the determination of flash temperatures at contact spots is critical. A corresponding theory was developed and verified in connection with experiments on graphite lubrication which depends on the presence of adsorbed moisture. Further, plastic contact spots and solid lubrication have been simulated by means of a Bridgman anvil apparatus. The results show that the same work-hardening behavior applies at contact spots as known from the bulk. They also proved that at contact spots intimate mixing of the materials of the two sides gives rise to a finely mixed layer which can amorphize by much the same dislocation mechanism as is believed to cause melting. The amorphous material promptly recrystallizes at least in the Cu-Ag system. It is proposed to try and inhibit such recrystallization by selected lubricants, so as to promote beneficial wear-resistant tribo-films.     

汾河景区水资源的合理利用

介绍了太原汾河景区的设计概况，分析了河流在防洪、水资源以及水景三方面功能的合理利用，保持了城市景区良好的自然生态，在水资源的综合利用方面取得了显著效果。     

测量高功率激光束衍射光斑阵列位置的图象处理方法

介绍了测量高功率激光束射光斑阵列的各光斑中心位置的计算机图象处理方法。讨论了ＴＩＦＦ图象格式的全用技巧，利用灰度级确定各衍射光斑光强中心以及去除噪声光点的计算机处理方法，用计算机软件实现了常规Ｈａｒｔｍａｎｎ－Ｓｈａｃｋ传感器中子透镜阵列的子光束聚焦过程。     

环形孔径高斯光束的远场特性

讨论环形孔径高斯光束的远场光斑能量分布，并给出拟合表达式。首先推导光束没有抖动时远场光斑的光能分布表达式，然后研究各种不同中心遮拦和不同光束截断比，在有以及没有激光束抖动的情况下，对高斯光束的远场环围能量分布变化的影响。     

陶瓷管壳金属化黑斑的成因探讨

对陶瓷管壳在金属化过程中产生的黑斑进行观察和检测分析 ,对其产生原因进行了探讨并提出一些改进措施。