基于信息融合理论和波动方程的地震地质统计学反演

通过对地震,测井等地学信息的空间结构进行研究,为三维地质建模提供变差函数模型,针对中国陆相复杂油储地质特点,提出了有效的随机建模方法,实现了基于波动方程的地震地质统计学反演方法,获取了一系列波阻抗实现,采用信息融合方法,挖掘所有实现中的确定性信息,用概率统计方法,研究反演结果的置信度,实现了分辨率波阻抗成像。     

抓住竞赛契机 深化计算机专业教学改革

各种计算机类竞赛对高校计算机专业的教学改革起到了积极的促进作用,本文倡导抓住竞赛契机,引导和深化计算机专业教育教学改革,并对教学模式的改革、新课程体系的制定和强化教师队伍的建设提出了具体举措.     

基于角色和任务的工作流访问控制管理模型

针对现有访问控制模型在工作流系统安全方面存在的不足,提出一种基于角色和任务的工作流访问控制管理模型(ATRBAC).该模型将ARBAC模型中的管理思想融入TRBAC模型,并引入管理员及管理权限,同时对管理员实行层次管理,解决了系统管理员的权限过大而产生的隐患,加强了系统的安全性.     

基于TrustZone的嵌入式系统安全性研究

嵌入式系统安全性的研究逐渐成为网络安全领域的一个重要课题。对基于TrustZone技术的嵌入式系统的安全性进行了研究,介绍了嵌入式安全操作系统、可信计算、CPU特权体系结构以及TrustZone技术。研究表明,基于可信硬件和安全操作系统的嵌入式系统安全体系,是解决嵌入式系统安全问题的可行方案。胡：2011一06—08     

富锗面包的研制

富锗面包是以面包专用粉为主要原料,以白砂糖、奶油、奶粉、鸡蛋、面包改良剂为辅料,加入富锗酵母,采取快速发酵法,经过调粉、发酵、烘烤精制而成。通过正交实验确定产品的最佳配方,利用ICP-AES方法测定富锗面包中有机锗的含量。     

Synthetic and biological activity of 25R and 25S diastereoisomers of dihydroxy-25,26 cholecalciferol (25,25(OH)2D3)]

The separation of 5-cholestene-3 beta, 25 (RS), 25-triol 3,26-diacetate into the diastereoisomers 25R and 25S by means of high pressure liquid chromatography (HPLC) is described. Their absolute configuration cannot be yet established. The less polar diastereoisomer is arbitrarily called 25 zeta1 and the more polar one 25 zeta2. Bromination, dehydrobromination and ultraviolet irradiation conducted to 25 zeta1, 26(OH2D3 and 25 zeta2, 26(OH)2D3 respectively. Their biological activity is described.     

Groundwater formation of martian valleys

The martian surface shows large outflow channels, widely accepted as having been formed by gigantic floods that could have occurred under climatic conditions like those seen today. Also present are branching valley networks that commonly have tributaries. These valleys are much smaller than the outflow channels and their origins and ages have been controversial. For example, they might have formed through slow erosion by water running across the surface, either early or late in Mars' history, possibly protected from harsh conditions by ice cover. Alternatively, they might have formed through groundwater or ground-ice processes that undermine the surface and cause collapse, again either early or late in Mars' history. Long-duration surface runoff would imply climatic conditions quite different from the present environment. Here we present high-resolution images of martian valleys that support the view that ground water played an important role in their formation, although we are unable as yet to establish when this occurred.