面向服务的远程方法调用中间件设计和实现

面向服务架构（SOA）能够提供一种支持HTTP协议,客户端和服务器松散耦合的解决方案,可以使多个独立的异种语言和平台的应用程序共享基础架构,这种架构给客户提供了一种异步的和面向消息的远程调用方法.提供了一个轻量级的基于XML面向服务的远程方法调用中间件的实现,这种实现利用Java中的反射机制,使用XML描述类的元信息,易于在Internet上的扩充功能及组合业务应用,适合作为中小型软件企业B/S系统开发框架基于消息的远程方法调用部分.     

Martian landslides in Valles Marineris: Wet or dry?

The objective of this paper is to determine whether martian landslides in Valles Marineris were wet or dry and place constraints on the availability of liquid water in Valles Marineris during the Amazonian, when the landslides occurred. We, thus, statistically compare the power-law relationship between the volume and runout distance of landslides on Earth with those in Valles Marineris, Mars. The exponent of the power-law for martian landslides is similar to that for dry landslides and volcanic flows on Earth, and differs significantly from wet debris flows on Earth. The constant of proportionality in the observed power-law relationship for martian flows is linearly proportional to gravity, as predicted from physical modeling of dry flows in which the dissipation occurs in a layer of uniform thickness. Conversion of gravitational potential energy to heat is insufficient to generate more than a few weight percent of liquid water in the landslide. We thus conclude that water did not significantly influence the dynamics of landslides in Valles Marineris. This implies predominantly dry conditions in Valles Marineris during the Amazonian.     

Ancient wet aeolian environments on Earth: clues to presence of fossil/live microorganisms on Mars

Ancient wet aeolian (wet-sabkha) environments on Earth, represented in the Entrada and Navajo sandstones of Utah, contain pipe structures considered to be the product of gas/water release under pressure. The sediments originally had considerable porosity allowing the ingress of living plant structures, microorganisms, clay minerals, and fine-grained primary minerals of silt and sand size from the surface downward in the sedimentary column. Host rock material is of a similar size and porosity and presumably the downward migration of fine-grained material would have been possible prior to lithogenesis and final cementation. Recent field emission scanning electron microscopy (FESEM) and EDS (energy-dispersive spectrometry) examination of sands from fluidized pipes in the Early Jurassic Navajo Sandstone reveal the presence of fossil forms resembling fungal filaments, some bearing hyphopodium-like structures similar to those produced by modern tropical leaf parasites. The tropical origin of the fungi is consistent with the paleogeography of the sandstone, which was deposited in a tropical arid environment. These fossil fungi are silicized, with minor amounts of CaCO₃ and Fe, and in some cases a Si/Al ratio similar to smectite. They exist as pseudomorphs, totally depleted in nitrogen, adhering to the surfaces of fine-grained sands, principally quartz and orthoclase. Similar wet aeolian paleoenvironments are suspected for Mars, especially following catastrophic sediment-charged floods of enormous magnitudes that are believed to have contributed to rapid formation of large water bodies in the northern plains, ranging from lakes to oceans. These events are suspected to have contributed to a high frequency of constructional landforms (also known as pseudocraters) related to trapped volatiles and water-enriched sediment underneath a thick blanket of materials that were subsequently released to the martian surface, forming piping structures at the near surface and constructional landforms at the surface. This constructional process on Mars may help unravel the complex history of some of the piping structures observed on Earth; on Earth, evidence for the constructional landforms has been all but erased and the near-surface piping structures exposed through millions of years of differential erosion and topographic inversion now occur as high-standing promontories. If the features on both Earth and Mars formed by similar processes, especially involving water and other volatiles, and since the piping structures of Earth provided suitable environments for life to thrive in, the martian features in the northern plains should be considered as prime targets for physico/mineral/chemical/microbiological analyses once the astrobiological exploration of the red planet begins in earnest.     

利用资本市场 加速推进GIS产业的发展

我国GIS产业面临严峻的挑战与发展的机遇 ,在GIS产业的发展中 ,应学会灵活运用资本市场与GIS产业的关系 ,利用资本市场完善GIS企业制度、筹措资金、实现GIS企业的跳跃式发展     

基于Web的作业上传与批改系统的设计与实现

介绍一个基于Web远程教学的作业上传批改系统.教师和学生可以在任何时间任何地方通过Internet访问教学服务器提交作业、进行批改和评分.该系统可应用于各类远程教学系统中,提高工作效率.     

朝花夕拾:新闻评论中的“旧闻评论”——新闻评论的审美诉求之三

进入新时期之后 ,由于拨乱反正的大环境的出现、评论员对于“新闻评论”的理念的变化、媒体和受众互动的审美诉求等原因 ,“旧闻评论”已经成为新闻评论的有机组成部分。其构成主要是 :( 1)从已经问世的“旧闻”中发掘新闻 ;( 2 )从尚未问世的“旧闻”中发现新闻 ;( 3)从司空见惯的“旧闻”史料中“切入”新闻。此类新闻评论的美感在于坚持真理修正错误的的使命感、“还历史本来面目”的正义感和“以古例今”的审美的陌生化。     

关于测绘人才资源开发的几点思考

测绘人才资源的开发和利用 ,直接影响测绘队伍的建设以及对各行业建设提供服务的效果 ,所以 ,测绘人才资源开发是测绘行业发展的首要问题 ,应该引起各级管理部门的思考     

边缘撕裂--一种致裂致震机制

明确提出两个板块或地块之间相互作用（主要是错动）中存在一种致裂致震机制－边缘撕裂，并以中国云南境内的红河断裂和美国加州的圣安德列斯两侧地块的边缘撕裂现象为例作了具体阐述。     

Early warning for geo-hazards based on the weather condition in China

According to national early warning practice for geo-hazards from 2003 .to 2005, it is systematically concluded that the basic characteristics of geo-hazards, early warning method and forecast result based on the geological maps of China in a scale 1：6 000 000. With the contrast of different characters between sustained rainfall and typhoon rainfall inducing geo-hazards, the disaster reduction result and some problems are preliminarily analyzed. Some basic recognition is that early warning to geo-hazards is feasible, national scale forecast is only to call attention, but can＇ t immediately be used to disaster reduction decision-making. And, the future direction is to build a united disaster reduction framework of early warning system including national, provincial and county levels based on weather factors in different scale of area.     

Diffuse Baryons in Cosmic Structures

I review the processes that govern the amount and the thermal state of the hot plasma pervading clusters and groups of galaxies: the gravitational heating driven by the DM merging histories, the radiative cooling of baryons, and the energy fed back by SNe and by AGNs or quasars. I argue that the X-ray emissions and the entropy levels now observed from clusters to groups require the AGNs to contribute substantially to preheat the gas before it falls into clusters, and the quasars to blow some plasma out of groups and galaxies.