胶西北焦家式和玲珑式金矿的形成机理

在胶西北地区,中生代郭家岭超单元岩浆期后成矿热液,形成了广泛发育的焦家式(蚀变岩型)和玲珑式(石英脉型)金矿床,并且具有相同的成矿热液,之所以产生两类有较大差异的上述不同类型的金矿床,在于热液房与外界的沟通条件有很多的不同。蚀变岩型金矿的热液房与外界沟通相对开放,成矿热液的压力迅速降低,促其汽化,增强了活动,有利于广泛交代作用的产生,导致了蚀变岩型矿床的形成;石英脉型的矿床热液房与外界沟通条件差,当温度下降后,才与外界沟通,主要表现为充填作用,而形成石英脉型矿床。     

一种光机混合的图像识别系统

本文分析了光学图像识别和计算机图像识别二者的特点，提出了一种光机混合物的图像相关识别系统。首先用计算机制作高质量的匹配滤波器，然后用光学相关识别系统进行相关识别。     

Scaling of thermodynamic mixing properties in garnet solid solutions

 The volumes and enthalpies of mixing, ΔV ^Mix and ΔH ^Mix, of binary solid-solution aluminosilicate garnets have been studied by computer simulation. The use of “average atoms” to simulate solid solution was found to give results that are considerably different from those obtained by calculating and averaging over many configurations of cations at a given composition. Although we expect mineral properties calculated from model calculations to be correct only on a qualitative rather than a quantitative scale, fair agreement with experiment was obtained where carefully tested potential parameters were used. The results show that mixing behaviour in these materials is controlled by local strain and relaxation effects resulting from the atomic size mismatch of the mixing divalent cations. In particular, ΔV ^Mix and ΔH ^Mix are shown to scale quadratically with the volume difference between the end members, and to vary essentially symmetrically with composition, with a moderate dependence on the degree and nature of cation order. We conclude that computer modelling should be useful in providing detailed qualitative information about the mixing properties of solid solutions, which can help to better constrain and interpret experimental results. Received: 8 March 2000 / Accepted: 1 October 2000     

光谱遥感数据波形分析法的应用

本文利用傅立叶波形分析算法处理了光谱反射率数据,把不同地物的光谱分解为特征意义明确,信息内涵丰富,对各种地物可分辨性强的各次谐波分量。诸谐波分量的参数——波幅和初相唯一地决定了其对光谱曲线的贡献和构形位置。试验表明傅立叶波形分析算法可以成为处理各种成像光谱仪获取的超维图像的有效工具。     

甘肃及邻近地区计算机编目系统软件研制

本文介绍了一套适用于甘肃及邻近地区计算机编目系统软件,经试运行表明,该软件可完全取代目前的人工编目工作,并有较人工编目快速、精确之特点。在软件研制过程中,吸收了国内其它地区计算机编目软件的优点,并使之具有自己的特色,更适合西北地区使用。     

基于高级语言函数的"坐标平移与旋转"算法优化

通过对高级语言内置函数的认识，运用具体示例，讲述如何实现传统的复杂的数学模型解算的优化。     

Photometric modeling of Saturn's rings. II. Azimuthal asymmetry in reflected and transmitted light

Dynamical N-body simulations (Salo, 992, Nature 359, 619) suggest the formation of trailing density enhancements in the outer portions of Saturn's rings, due to local gravitational instabilities. These Julian-Toomre type wakes, having a pitch angle of about 20°-25° with respect to the local tangential direction, seem to provide a plausible explanation for the observed quadrupole brightness variation in Saturn's A ring (Salo and Karjalainen, 1999, Bull. Am. Astron. Soc. 31, 1160; French et al., 2000, Bull. Am. Astron. Soc. 32, 806; Porco et al., 2001, Bull. Am. Astron. Soc. 33, 1091). We have carried out systematic photometric modeling of gravitational wake structures seen in dynamical simulations, performed for the parameter values of the A ring, using the Monte Carlo radiative transfer code described in Salo and Karjalainen (2003, Icarus 164, 428). Comparisons to the observed asymmetry in various cases are presented (asymmetry in reflected and transmitted light, ring longitude and opening angle dependence), in all cases confirming the applicability of the wake model. Typically, minimum brightness corresponds to viewing/illumination along the long axis of wakes; however, the sense of modeled asymmetry reverses at small tilt angles in diffuse transmission. Implications of wakes on the occultation optical depth profiles and the A ring overall brightness behavior are also discussed: it is shown that the wake structure needs to be taken into account when the Cassini occultation profiles for the A ring are interpreted in terms of variations in surface density. Also, the presence of wakes offers a plausible explanation for the inverse tilt effect seen in the mid A-ring.     

直流电法在探测废弃地下洞室中的应用

通过两个实例说明,使用直流电法进行视电阻率测量时,仪器轻便,操作简单,成果直观。用于探测废弃地下洞室是可行的。该方法装置种类繁多,针对不同的工作条件和工作目的,选用不同的装置,可以取得令人满意的效果。     

Towards an explanation of why onboard fires happen: The case of an engine room fire on the cruise ship “Le Boreal”

As the cruise ship industry enjoys continuous growth and penetration into new markets, good safety records must be maintained to achieve business objectives. Unfortunately, serious incidents and accidents reoccur on modern cruise ships and hence a better understanding of why this continues to happen is needed. This paper contributes towards a better understanding of underlying causal factors behind onboard fires, focusing on consequential engine room fires in particular. By analysing a recent fire incident on an almost new cruise ship built to the latest standards, we reveal potential deficiencies in maritime safety control and suggest how they can be rectified. The incident analysis was guided by systemic method CAST, which enables to explore a complex socio-technical system responsible for safety control. The analysis provides a different, more comprehensive explanation of, and response to, the incident from that in the official accident investigation report. Given the systemic nature of suggested causal scenarios, they are capable to explain and preclude other incidents. From a practical point of view, the findings would allow developing and maintaining robust safety management systems, which are currently required onboard.     

综合布线系统在气象核心网络升级中的应用

综合布线系统采用标准化的语音、数据、图像、监控设备,各线综合配置在一套标准的布线系统上,统一布线设计、安装施工和集中管理维护。综合布线系统在广东省气象局核心网络升级综合布线实际应用效果明显。