Shape格式海图数据向S-57格式的转换

介绍了国际海道测量组织数字海道测量数据传输标准(IHO-57)数据生产的国内外现状,通过对S-57数据模型和数据结构的深入研究和大量实验,实现了S-57数据的解译与生成,完成了Shape数据与S-57的格式转换。     

基于GIS的处理服务构建方法

伴随着GIS技术的逐步发展和日渐成熟,人们对地理信息提出了更高的要求,促进了地理信息系统向地理信息服务方向发展。地理信息服务主要包括数据服务和处理服务两部分,目前,大多数厂商提供的地理信息服务仅局限于数据服务层面,处理服务较少实现。本文通过对处理服务原理及构建方法的研究,基于国家基础地理信息中心的全球地表覆盖动态信息系统,在Visual Studio 2010平台下实现了将功能封装为处理服务,并在服务流程编排的基础上实现处理服务的调用。     

重组抗菌肽海藻酸钠微囊制备与体外释放特征研究

对重组表达的海洋生物抗菌肽对虾素3-2进行亲和层析纯化,以海藻酸钠为壁材,采用凝聚法制备了重组抗菌肽海藻酸钠微囊,以微囊的形态和包封率为指标优化制备工艺,对制备的微囊进行体外释放特征的初步研究。结果显示,在氯化钙浓度为1.5%,海藻酸钠浓度为2.0%时,制备的微囊为完整的球形,冷冻干燥后的直径约为1.1 mm,包封率为83.87%。微囊在模拟胃液(pH 2.0)中2 h左右释放量趋于稳定,释放量低于14%;微囊在模拟肠液(pH 7.8)中不断释放,5 h时释放量达98%,表明微囊具有良好的肠溶性而可以抵抗胃液的破坏,可以用作重组抗菌肽缓释/控释制剂,为抗菌肽在水产病害防治过程的口服给药提供实验基础。     

黔北桑木场地区铅锌矿流体包裹体特征及其成因探讨

本文通过对黔北桑木场地区铅锌矿流体包裹体特征的研究,结果表明,流体包裹体均一温度在130℃～210℃之间,存在130℃～150℃与170℃～210℃两个峰值区间;含盐度较高,均值在8. 39%～21. 81%;密度主体在1. 00～1. 05 g/cm~3,显示铅锌矿成矿流体具中低温度、高等密度、高盐度特征。并研究认为区内铅锌矿与MVT型铅锌矿关系密切,具两期热液活动。     

基于IPv6协议的隧道技术的实现

隧道技术是IPv6协议的1个组成部分,按照底层的承载协议不同,分为IPv4隧道和IPv6隧道。文中描述了未来将广泛应用的IPv6隧道的原理,目前各种主流网络操作系统对IPv6隧道的支持情况,提出如何在CERNET2高速网络上利用IPv6隧道来传输IPv4流量。     

Strengthening of Soft Marine Clay Using Bioencapsulation

Dredged or excavated soft marine clay can be improved by mixing it with cement or lime. However, these treatments are usually expensive. It is shown in this paper that soft marine clay can be strengthened through a bioencapsulation method in which the shear strength of clay aggregates can be substantially increased after the aggregates are treated with urease-producing bacteria, calcium chloride, and urea. We found that the bioencapsulation had increased the unconfined compressive strength of marine clay aggregates with a size of 5 mm from almost zero to more than 2 MPa. The strength of the bioencapsulated clay aggregates decreases with the increase in the size of the aggregate when the size is greater than 5 mm.     

沉积岩中成岩伊利石年龄测定研究进展

伊利石的形成与盆地的沉积和热演化有密切关系，它可以指示油气的形成时代，因此测定成岩伊利石的形成年龄是一个重要的课题。碎屑伊利石往往与成岩伊利石共生，导致样品的年龄远远大于成岩伊利石的真实年龄。为了有效地分离成岩和碎屑伊利石，需要使用IAA法和烷基胺阳离子取代法等，结合真空密封法等其他技术，能够得到更好的效果。并介绍了国外伊利石定年的研究现状。     

面向目标数据模型在地理属性数据库中的应用

这篇文章分析了 GIS 属性数据库中传统关系数据模型所存在的问题;介绍了面向目标数据模型的基本概念;探讨了利用面向目标语言Hyper Talk 和关系数据库管理系统Oracle 的结合实现这种模型的可能性。按这种方式建立的地理属性数据库的原型表明,它可以克服传统的关系数据模型所存在的某些问题,提高数据库的效率。     

Model‐based predicting and correcting algorithms for substructure online hybrid tests

A set of algorithms combined with a substructure technique is proposed for an online hybrid test framework, in which the substructures are encapsulated by a standard interface that implements displacements and forces at the common substructure boundaries. A coordinator equipped with the proposed algorithms is designed to achieve boundary compatibility and equilibrium, thereby endowing the substructures the ability to behave as one piece. A model‐based predictor and corrector, and a noniterative procedure, characterize the set of algorithms. The coordinator solves the dynamics of the entire structure and updates the static boundary state simultaneously by a quasi‐Newton procedure, which gradually formulates the condensed stiffness matrix associated with corresponding degrees of freedom. With the condensed stiffness matrix and dynamic information, a condensed equation of motion is derived and then solved by a typical time integration algorithm. Three strategies for updating the condensed stiffness matrix are incorporated into the proposed algorithms. Each adopts different stiffness matrix during the predicting and correcting stage. These algorithms are validated by two numerical substructure simulations and a hybrid test. The effectiveness and feasibility are fully demonstrated. Copyright © 2012 John Wiley & Sons, Ltd.