数字三分量检波器在海拉尔盆地应用效果分析

多分量多分量地震勘探技术将为人们提供一种认识油藏的新手段,可以确定仅靠纵波资料无法认识的油藏特征。有了这项技术,在从勘探到综合油藏优化的所有关键经营决策中,地震资料都将起到非常重要的作用。多分量地震勘探技术,其影响将不亚于地震勘探从2D到3D的飞跃。本文通过数字检波器与常规检波器参数对比,并对数字三分量检波器与传统模拟检波器的理论参数和实测参数进行仔细研究和对比;采取多种实验方法比较两种检波器的实际使用效果,最终通过多方面的采集资料比较,对在类似区开展三分量地震采集提供方向。     

松辽盆地ALX地区数字检波器地震资料处理技术总结

数字检波器具有动态范围大、信号畸变小、相位无延迟的优势,是进一步提高地震分辨率和保真度的有效途径,但由于数字检波器单点接收,原始资料信噪比较低,严重制约分辨率提高。大庆油田于2012年首次在松辽盆地北部西斜坡ALX地区开展数字检波器接收地震资料勘探,地震资料处理阶段通过对数字检波器资料叠前及叠后的关键去噪技术进行了分析的基础上,利用分类、分频、分域、分步逐级压制噪音提高资料信噪比的方法,较好地解决了单点数字检波器接收资料信噪比低的难题。     

地震检波器技术专利申请分析

地震检波器是地球物理领域地震勘探分支中地震仪器的重要组成部分,是一种将机械振动转换为电信号的机电转换装置,也是广泛应用于石油地震勘探及工程测量领域中的专用传感器。本文依据国家知识产权局专利检索与服务系统中公开的地震检波器技术领域的专利数据,着重对地震检波器技术在全球和中国范围内专利申请情况进行了统计与分析,以期掌握地震检波器技术的发展状况,为国内申请人在地震检波器技术专利布局和研发提供借鉴。     

三分量数字检波器——VectorSeis和DSU3

多波地震采集技术作为一种新技术、新方法,越来越受到勘探的重视。而多波地震采集工作的质量在很大程度上取决于数字三分量检波器的技术性能。文章就Vectorseis和Dsu3三分量检波器的基本结构、原理进行了介绍,分析了VectorSeis和Dsu3检波器的抗电磁干扰的能力,介绍了其主要的性能与技术指标,给出了与普通检波器性能技术指标的对比分析。     

三位地震勘探提高采集精度的探讨

在近年来的地震勘探采集技术发展过程中,高分辨率地震勘探采集技术得到了地震勘探界的普遍重视,并且它在工程地震、煤田及浅油层勘探等方面应用取得了较好的成效。重点从高分辨率地震勘探采集技术中的激发耦合问题,激发药量,检波器频率的选择、埋置以及组合,噪声和覆盖次数等方面对高分辨率采集技术进行分析探讨,提出了一些新的认识和建议。     

24D-A新型检波器在地震勘探中的应用

正随着我国地震勘探技术的发展,地震勘探对野外数据采集的信息量和精度要求越来越高。野外资料采集是整个勘探过程的前沿,检波器性能是取得原始资料的关键所在。研究、开发、生产的新型高输出宽频带、大动态、失真度小、低噪声、高频检波器,能有效提高地震波的信噪比、分辨率和有效信号的采集。本文通过对比试验和野外生产实验证明了24D-A新型宽频带大动态高频地震检波器的优势。     

数字检波器在地震勘探中的应用效果

随着时代的变迁,人类技术的进步,地震检测仪从最早的候风地动仪一步一步发展到今天的检测器,途中经历了科学家无数次的改革与创新。其中最具有代表性的是数字检波器,它凭借较高的灵敏度、精准度和稳定性在行业内已处于领先地位,为地震勘探提供了最准确的数据信息。     

城市物探的可行性——以邢东矿后备区三维地震数据为例

城市物探往往因为地表建筑物密集,空中高压线,地下管网错综复杂,成孔难、检波器安置难度大,安全生产压力大,得到的地震记录信噪比低等原因,造成野外数据采集工作极其困难.本文以邢东矿后备区为实例对城市物探地震勘探采集技术进行归纳总结.     

矿区全数字高密度三维地震勘探技术的应用

要想促使地震勘探结果达到较高的精度水平,就必须提高勘探采集系统的覆盖动态范围,同时三维地震资料的图像质量和空间采样的密度与观测系统之间也存在着密切的相关性。本文重点就全数字高密度三维地震勘探的数据采集技术、目标处理技术、地质资料解译技术等三方面的技术内容展开了深入的研究工作,全数字高密度三维地震勘探技术相较于传统的三维地震勘探而言,其在断层位置、小断层判断、陷落柱探测及高陡构造勘探等方面均有着更为突出的优势特性。     

石油勘测MEMS传感器数据采集器研究

在石油勘探工作中应用MEMS传感数据采集技术,可进一步提高勘探数据的精准度。本文从石油勘探系统中的MEMS传感器应用特点入手,分析MEMS传感数据采集的主要技术,并讨论在石油勘探MEMS系统中的硬件设计与软件设计内容,以求有效解决石油勘探过程中的灵敏度低、谐波失真大等问题。     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.     

Cooler temperatures inductive to locust outbreaks

Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.     

Low doses of a red wine ingredient figh diabetes in mice

Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said.     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.     

Rough Justice: A Statistical Assessment of ICANN's Uniform Dispute Resolution Policy

Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP.     

Prevalence of soft neurological signs in Chinese people

Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.     

Molecular motor assembly of a biomimetic system

Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction.     

Monoculture Rubber Plantations Have Negative Ef ects on Controlling Splash Erosion

<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence