乡村地质调查路径与支撑作用：以江苏仪征月塘为例

乡村综合地质调查是服务乡村振兴战略的基础工作。以江苏仪征月塘为例,结合乡村发展规划与需求,在研究区开展了国土空间利用现状调查、水土环境地质调查、特色自然资源调查、工程地质调查等综合地质调查工作,为乡村农田建设、特色自然资源开发利用、地质环境保护等提供地质依据与支撑,探索乡村地质调查路径,为今后构建乡村地质调查工作体系提供思路,延伸地质工作服务领域。     

Selenium deficiency as a consequence of human activity and its correction

Problems of sustainable development in connection with the change of biogeochemical cycle of selenium and overcoming its deficiency in Russia, Serbia, Belarus and other countries are reported. The history of the biological role of selenium as an essential trace element is discussed. A special program of «Overcoming of selenium deficiency» has been developed by researches of Russia, Serbia and Belarus in view of high morbidity rates for cardiovascular, tumor and endemic diseases affecting the population of both the above and some other countries, including children, prevalence of selenium deficiency among livestock species and aggravation of the environmental situation as a result of man-made processes.     

陕西八卦庙金矿床构造特征及其对成矿的控制

文章对八卦庙金矿床的矿区构造特征，矿床地质和矿床成因作了系统的分析，认为在断陷盆地中形成的一套具有浊流沉积特征和热水沉积特征的含金高背景的赋矿岩石为金矿的矿源层。在褶皱造山过程中，金元素发生活化，再分配并在层间破碎带，构造片理化带及剪切带中预富集。在印支期－燕山期的构造及伴随的岩浆热液作用下，金矿最终在构造有利部位富集成矿。该矿床构造控矿明显，因此，研究其构造特征对于搞清该矿床的成因，进行成矿预测，确定找矿标志有一定的指导意义。     

中国砂岩型铀矿区遥感影像特征研究的新发现及其重要意义

砂岩型铀矿是我国目前铀资源勘查主攻的目标类型 ,但在勘查过程中 ,往往侧重地层的岩性、岩相等控矿因素研究 ,而对断裂构造的控矿作用没有引起足够重视。通过对中国砂岩型铀矿区遥感影像特征的系统研究 ,发现我国主要砂岩型铀矿区均有控制工业铀矿产出的断裂构造存在。在此基础上 ,剖析了控矿构造的特点及其控矿作用 ,提出构造 地球化学障的控矿新模式。最后论述了构造 地球化学障模式与传统氧化带前锋模式的区别 ,并探讨了其提出的重要意义     

冀东滦县地区前寒武纪铁矿与火山喷发沉积旋回的关系

本区原岩建造是-套基性—酸性火山凝灰岩（主要）+铁硅质岩+沉积岩组合。整个层序反映了一个较完整的火山喷发沉积旋回。含铁建造与沉积旋回在时空和物源上存在着密切的成因联系。铁矿的形成及分布并非受控于某一种岩石,而是受控于火山喷发沉积旋回。本文从岩浆分异、火山活动、沉积作用及构造运动等的发生、发展、演化的角度较全面地分析了火山喷发沉积旋回的控矿作用。     

农业文化遗产社区角色认同对旅游参与的影响研究——以浙江省青田县龙现村为例

探究居民作为农业文化遗产传承者的角色认同是否影响其参与旅游,是农业文化遗产地可持续旅游研究的重要问题。基于角色认同理论,以全球重要农业文化遗产保护试点项目浙江青田稻鱼共生系统为例,利用时间日志法和半结构式访谈法获取当地居民时间利用数据,并从时间利用视角出发就居民角色认同对其旅游参与的影响进行质性探讨,以期深度挖掘居民的态度和心理感知。结果表明:居民作为农业文化遗产传承者,其角色认同对旅游参与具有一定的影响。以居民角色认同程度和旅游参与程度作为分类变量加以交互组合,形成4种常见的旅游社区参与类型,即高角色认同-深度参与旅游型居民、高角色认同-浅度(未)参与旅游型居民、低角色认同-浅度(未)参与旅游型居民、低角色认同-深度参与旅游型居民。从而针对不同类型居民,提出农业文化遗产旅游参与和遗产保护的可行性建议。     

混合访问控制模型在测绘应用系统中的应用

本文在分析测绘系统开发与应用中测绘数据的复杂性,以及大部分测绘系统都包含业务流程等特点的基础上,除了RBAC模型的角色授权外,加入了任务对操作进行授权,对RBAC模型进行了有效的扩展,使其更具通用性。该方法有效解决了传统的RBAC模型在测绘系统应用中存在的弊端,对其他应用系统建设同样具有理论指导。     

Is anthropogenic land subsidence a possible driver of riverine flood-hazard dynamics? A case study in Ravenna,Italy

We investigate possible changes in flood hazard over a 77-km² area around the city of Ravenna. The subsidence rate in the area, naturally a few mm year^?1, increased dramatically after World War II because of groundwater and natural gas extraction, exceeding 110?mm year^?1 and resulting in cumulative drops larger than 1.5?m. The Montone–Ronco river system flows in the southern portion of the area, which is protected against frequent flooding by levees. We performed two-dimensional simulations of inundation events associated with levee breaching by considering four different terrain configurations: current topography and a reconstruction of ground elevations before anthropogenic land subsidence, both neglecting and representing the main linear infrastructures (e.g. roads, artificial channels). Results show that flood-hazard changes due to anthropogenic land subsidence (e.g. significant changes in computed water depth and velocity) are observed over less than 10% of the study area and are definitely less important than those resulting from construction of the linear infrastructures.     

基于角色和任务的访问控制在工作流管理系统中的应用

工作流管理系统（WfMS）是一个应用于企业的业务自动化管理系统,需要一个很好的访问控制机制来进行管理控制。基于工作流管理系统中复杂的权限管理这一安全需求,将基于角色和任务的访问控制机制应用于工作流管理中,使WfMS中的访问控制以任务为中心,达到动态管理的目的,同时由于角色的存在而简化了授权操作的复杂性。最后,给出了实现系统访问控制模块的主要功能类。     

Modeling the Roles of Precipitation Increasing in Glacier Systems Responding to Climate Warming —— Taking Xinjiang Glaciated Region as Example

The studies on prediction of climate in Xinjiang almost show that the precipitation would increase in the coming 50 years, although there were surely some uncertainties in precipitation predictions. On the basis of the structure of glacier system and nature of equilibrium line altitude at steady state （ELAo）, a functional model of the glacier system responding to climate changes was established, and it simultaneously involved the rising of summer mean temperature and increasing of mean precipitation. The results from the functional model under the climatic scenarios with temperature increasing rates of 0.01, 0.03 and 0.05 K/year indicated that the precipitation increasing would play an evident role in glacier system responding to climate change： if temperature become 1 ℃ higher, the precipitation would be increased by 10%, which can slow down the glaciers retreating rate in the area by 4 %, accelerate runoff increasing rate by 8 % and depress the ELAo rising gradient by 24 m in northern Xinjiang glacier system where semi-continental glaciers dominate, while it has corresponding values of only 1%, 5 % and 18m respectively in southern Xinjiang glacier system, where extremely continental glaciers dominate.