共查询到20条相似文献，搜索用时 140 毫秒
1.
首先介绍银证通基本概念,阐述了集中式银证通系统设计的基本理念、体系结构,然后在此基础上讨论了银证通系统中双向交易的设计和实现,提出了两种解决方案,分析了最初方案的缺点所在,进而提出了改进方案,达到了预期的效果. 相似文献
2.
4月26日,著名地质摄影家赵洪山编著的《地质摄影》一书,由中国文史出版社正式出版发行。《地质摄影》是国内第一部系统介绍地质摄影的著作。此书首次对"地质摄影"给出了定义,并追溯了世界地质摄影的历史,指出了地质摄影的特点,介绍了地质摄影的经验和方法,分析了地质摄影与风光摄影等其他摄影门类的联系和区别,从而形成了系统的地质摄影理论。同时,该书还收录了作者众多精美的地质摄影作品,既展示了国内地质摄 相似文献
3.
蔡旸 《成都信息工程学院学报》2004,19(4):500-502
介绍了计算机支持的协同工作的概念,分析了协同设计中存在的冲突和解决方案,阐述了协同设计研究中存在的问题,为进一步开展研究工作奠定了基础. 相似文献
4.
段根华 《资源导刊(河南)》2020,(3):36-36
“3年多的时间,俺村发生了翻天覆地的大变化,村内的道路修好了,到户增收的养羊项目落实了,村容村貌改善了,新村室装上大空调了,整村脱贫工作推进也进展顺利……这多亏了县自然资源局的帮扶。”近日,民权县城关镇大陈庄村党支部书记吴亚明向正在村里走访慰问贫困群众的民权县自然资源局负责人朱昆郎说起了村里的变化。 相似文献
5.
在分析P2DR2模型的基础上,阐述了发展网络安全动态防御体系的重要性,讨论了其功能需求,提出了改进的IDS分析响应系统模型,并以其为核心构建了网络安全动态防御体系,还讨论了实现的关键技术并给出了应用实例. 相似文献
6.
他们一是深入开展了专项学教活动。制定了《望奎县国土资源局学习制度》，对每月的学习内容做了系统安排，不断巩固提高学习成果。二是深入开展了“关注民生、服务发展”活动。制定出台了《活动实施方案》等行风建设方案，有效规范了国土干部的从政行为，促进了工作作风的好转。三是深入开展了“双学促廉”活动。 相似文献
7.
过完年的时候,心里就开始嘀咕了,嗨,不知还能在家里待多久!心里的感觉怪怪的,又很复杂。很多年了,自打踏入了地质这个行业,就注定了要过一种不同的生活。记得多年前一位朋友说我:我觉得你们就是一群候鸟,也是过着一种迁徙的生活。春天到了,天气热了,你们就该出去了。到深山里,到荒原中,去到那些遥远的神秘的地方。只有到了冬天,你们又是像倦飞的鸟儿一样回来。朋友的话很形 相似文献
8.
介绍了基于数据库技术的气象部门计算机审计软件的主要功能和研制技术,该软件研制设计了审计数据库,研究设计了财务分析方法和凭证审核方法,该软件2001年在气象部门推广应用,收到了较好的应用效果. 相似文献
9.
10.
基于VB.NET的AutoCAD二次开发在土地勘测定界中的应用 总被引：1，自引：0，他引：1
对 AutoCAD 的二次开发做了简单介绍,并进行了基于 VB.Net 的二次开发,使 AutoCAD 在土地勘测定界中得到了充分的应用。该程序在工程实践中的应用,解决了传统勘测定界中的难题,提高了测绘工作效率。 相似文献
11.
ＴｈｅＳｏｎｇｈｕａＲｉｖｅｒ，ｏｎｅｏｆｔｈｅｍａｊｏｒｒｉｖｅｒｓｉｎＮｏｒｔｈｅａｓｔＣｈｉｎａ，ｈａｓｔｗｏｓｏｕｒｃｅｓ：ｔｈｅｎｏｒｔｈｓｏｕｒｃｅｉｓｔｈｅＮｅｎｊｉａｎｇＲｉｖｅｒａｎｄｔｈｅｓｏｕｔｈｓｏｕｒｃｅｉｓｔｈｅＳｅｃｏｎｄＳｏｎｇｈｕａＲｉｖｅｒ．ＴｈｅｔｒｕｎｋｓｔｒｅａｍｏｆｔｈｅＮｅｎｊｉａｎｇＲｉｖｅｒ，ｒｉｓｉｎｇａｔｔｈｅｓｏｕｔｈｅｒｎｆｏｏｔｏｆｔｈｅＹｉｌｅｈｕｌｉＭｏｕｎｔａｉｎ，ｉｓ１３７０ｋｍｌｏｎｇａｎｄｉｔｓｗａｔｅｒｓｈｅｄａｒｅａｉｓ… 相似文献
12.
Variation in intermediate water salinity in the South China Sea (SCS) between the 1960s and 1980s was studied using historical hydrographic data. The results demonstrate that the water was significantly fresher in the 1980s than in the 1960s, indicating that vertical mixing at intermediate water depth was reduced in the 1980s. This was partially because of the change of the SCS meridional overturning circulation (MOC) connecting local intermediate water with deep water. Data assimilation showed a 0.5Sv (1 Sv=10 6m 3/s) reduction in the strength of the MOC, which is about one third of the mean SCS MOC. Because the SCS MOC is linked to the Pacific Ocean, such an interdecadal variation in the intermediate water SCS may reflect anthropogenic climate change in the world ocean. 相似文献
13.
As a multi-branch estuary system, the Yangtze Estuary presents distinctive characteristics of hydrodynamic processes through co-action among river runoff, tides, wind-waves, and gravitational circulation. To study the pathways of flushing water along all of the estuary's branches and analyze their differences, especially those due to the influence of seawater intrusion and discharge variations, a free surface flow modeling suite TELEMAC-MASCARET involving passive tracers was applied to the Yangtze Estuary and the adjacent waters. The open boundary conditions were provided by the Nao.99 b model(Matsumoto et al., 2000), which was calibrated using observed velocity and salinity data obtained in March 2002. The water age, which was used as the diagnostic tool to study the flushing efficiency of the water body across the estuary, was solved by additional advection-diffusion-reaction equations implemented in the TELEMAC modeling system. The transport properties were investigated under different river discharge scenarios, which represented seasonal impacts; aspects relating to the influence of tide, surface wind stress, and density-induced circulation on age were also investigated. Model results showed that river runoff is one of the dominant factors influencing the spatial distribution of the mean age, while tidal force is another important factor. The horizontal freshwater age distribution demonstrated similarity compared with the salinity distribution; the vertical age distribution resembled the stratification pattern of salinity in all branches where stratification persists. An experimental numerical simulation of tracing saltwater age from the lower reaches of the estuary was conducted, and implicated the connectivity with transport processes of freshwater from upstream. Additionally, a particle tracking algorithm was used to analyze the dynamic characteristics of the four passages. The South Passage and South Channel were found to be significant as main water flow passages, while salinity intrusion in the North Branch was found to cause a return flow that partially joins the South Branch flushing water. 相似文献
14.
基于行为驱动的传统时空数据模型只关注时空对象的空间运动行为,忽略了行为对时空对象属性、关系等的改变,导致行为对时空对象的驱动机制研究不足。时空行为是全空间信息系统表达的重要特征之一,为此,本文从以下几个方面阐述了时空对象的行为。首先,本文阐述3行为的定义及将行为作为时空本体的元组的必要性。其次,研究了时空对象行为的复杂性、可继承性及在时态上的延续性等特征。再次,根据行为的作用对象,将时空对象的行为分为空间行为、属性行为、关系行为及复合行为4类行为,并给出了上述4类行为的定义与形式化表达方式。最后,分析了时空本体中时空行为的驱动机制。通过时空行为分类及其在时空本体中的形式化表达研究,为基于行为驱动的时空对象构模奠定了理论基础。 相似文献
15.
张卫峰 《广东海洋大学学报》2014,(2):85-88
通过高句丽王朝接受中原文化的途径、方式、程度,并结合高句丽王朝较其他少数民族在文化发展上的优势,对高句丽王朝时期的文化艺术发展作综合判断,认为高句丽文化艺术是边疆文化的重要组成部分,对东北亚地区的文化交流和传播做出重要贡献。 相似文献
16.
《中国海洋大学学报(英文版)》2019,(6)
Diversion of the Yellow River is a unique geological event in offshore China, causing changes of the sedimentary environment in eastern China Seas. The last diversion took place in AD 1855, with the estuary diverted from the Yellow Sea into the Bohai Sea. The identification of the river diversion events in the shelf sediments would not only provide the definite ages for the sediments, but also give a clue for better understanding of the sedimentation in that area. In this study, 210 Pb, grain size, geochemical element, and foraminiferal data in core H205 from the north Yellow Sea were systematically investigated. A high-resolution sedimentary record was established, which was coupled with the Yellow River diversion and runoff changes. The results show that the foraminiferal composition and foraminiferal abundance of the sediments from the north Yellow Sea had good response to the Yellow River diversion in 1855. Before the change, shallow water assemblages dominated the foraminifera, and the abundance of each foraminiferal species was very low. After the diversion event, the abundance of most foraminifera increased sharply, with a maximum increase of 16 times, and the assemblage was still dominated by shallow water species. Furthermore, the changes in foraminiferal abundance in the core sediments corresponded well with the discharge fluctuation of the Yellow River since 1855. When the Yellow River began entering the Bohai Sea, the Yellow River water, which is rich in nutrients, along with the coastal currents affected the north Yellow Sea, increased the primary productivity in the north Yellow Sea, which is the main reason for the abrupt increase and fluctuation of foraminiferal abundance in this area. At the meantime, the East Asian winter monsoon could also promote the development of nearshore foraminiferal species by enhancing the coastal currents. 相似文献
17.
To reconstruct the formation and evolution process of the warm current system within the East China Sea (ECS) and the Yellow Sea (YS) since the last deglaciation, the paleoceangraphic records in core DGKS9603, core CSH1 and core YSDPI02, which were retrieved from the mainstream of the Kuroshio Current (KC), the edge of the modem Tsushima Warm Current (TWC) and muddy region under cold waters accreted with the Yellow Sea Warm Current (YSWC) respectively, were synthetically analyzed. The results indicate that the formation and evolution of the modem warm current system in the ECS and the YS has been accompanied by the development of the KC and impulse rising of the sea level since the last deglaciation. The influence of the KC on the Okinawa Trough had enhanced since 16 cal kyr BE and synchronously the modem TWC began to develop with the rising of sea level and finally formed at about 8.5 cal kyr BP. The KC had experienced two weakening process during the Heinrich event 1 and the Younger Drays event from 16 to 8.5 cal kyr BP. The period of 7-6 cal kyr BP was the strongest stage of the KC and the TWC since the last deglaciation. The YSWC has appeared at about 6.4 cal kyr BP. Thus,the warm current system of the ECS and the YS has ultimately formed. The weakness of the KC,indicated by the occurrence of Pulleniatina minimum event (PME) during the period from 5.3 to 2.8 cal kyr BE caused the main stream of the TWC to shift eastward to the Pacific Ocean around about 3 cal kyr BP. The process resulted in the intruding of continent shelf cold water mass with rich nutrients. Synchronously, the strength of the YSWC was relatively weak and the related cold water body was active at the early-mid stage of its appearance against the PME background, which resulted in the quick formation of muddy deposit system in the southeastern YS. The strength of the warm current system in the ECS and the YS has enhanced evidently, and approached to the modern condition gradually since 3 cal kyr BP. 相似文献
18.
Changes in the thermal and hydraulic regime within the active layer in the Qinghai-Tibet Plateau 总被引：1，自引：1，他引：0
The change trends of air temperature,precipitation and evaporation from 1999 to 2008 shows that the climate in the Qinghai-Tibet Plateau permafrost region had become warmer.The analysis of the systematic active-layer data monitoring network along the Qinghai-Tibet Highway indicated that the active-layer thickness had been increasing and the soil temperature was rising.The soil temperature was rising in winter but not at the end of spring or during the entire summer.With thickening and warming of the active layer,the liquid water content of the active layer had an obvious downward migration and liquid water content in the top horizons decreased,but in the deeper horizons it increased. 相似文献
19.
进行了施氏獭蛤(Lutraria sieboldii Reeve)的人工育苗、幼虫发育及行为观察实验。结果显示:在施氏獭蛤幼虫发育过程中,壳顶后期幼虫只有鳃丝及足出现,而没有眼点出现,发达的足和鳃丝是幼虫变态的标志;幼虫变态期明显的分为3～5d的爬行期和3～5d的附着期;爬行期幼虫有单条水管形成,附着期幼虫只有一条分叉的足丝,水管为单管型;底栖稚贝期开始形成两条水管,底栖稚贝早期的幼虫不具备潜沙能力,只进行爬行活动,随着水管的快速发育,幼虫逐渐具备潜沙能力,幼虫壳长达2500μm、水管长达6000μm以上时,最终具备和成体一样的完全潜沙能力。 相似文献
20.
To reconstruct the formation and evolution process of the warm current system within the East China Sea (ECS) and the Yellow
Sea (YS) since the last deglaciation, the paleoceangraphic records in core DGKS9603, core CSH1 and core YSDP102, which were
retrieved from the mainstream of the Kuroshio Current (KC), the edge of the modern Tsushima Warm Current (TWC) and muddy region
under cold waters accreted with the Yellow Sea Warm Current (YSWC) respectively, were synthetically analyzed. The results
indicate that the formation and evolution of the modern warm current system in the ECS and the YS has been accompanied by
the development of the KC and impulse rising of the sea level since the last deglaciation. The influence of the KC on the
Okinawa Trough had enhanced since 16 cal kyr BP, and synchronously the modern TWC began to develop with the rising of sea
level and finally formed at about 8.5 cal kyr BP. The KC had experienced two weakening process during the Heinrich event 1
and the Younger Drays event from 16 to 8.5 cal kyr BP. The period of 7–6 cal kyr BP was the strongest stage of the KC and
the TWC since the last deglaciation. The YSWC has appeared at about 6.4 cal kyr BP. Thus, the warm current system of the ECS
and the YS has ultimately formed. The weakness of the KC, indicated by the occurrence of Pulleniatina minimum event (PME) during the period from 5.3 to 2.8 cal kyr BP, caused the main stream of the TWC to shift eastward to
the Pacific Ocean around about 3 cal kyr BP. The process resulted in the intruding of continent shelf cold water mass with
rich nutrients. Synchronously, the strength of the YSWC was relatively weak and the related cold water body was active at
the early-mid stage of its appearance against the PME background, which resulted in the quick formation of muddy deposit system
in the southeastern YS. The strength of the warm current system in the ECS and the YS has enhanced evidently, and approached
to the modern condition gradually since 3 cal kyr BP.
Supported by the National Natural Science Foundation of China (Nos. 90411014 and 40506015), the National major Fundamental
Research and Development Project (No. 2007CB815903) and the CAS Pilot Project of the National Knowledge Innovation Program
(No. KZCFX3-SW-233) 相似文献