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排序方式: 共有152条查询结果,搜索用时 15 毫秒
1.
由于水平井中流体的流动相态和施工工艺的复杂性,造成常规的产出剖面测井技术难以适应于水平井,因此水平井产出剖面测井技术是一项技术含量高、研究难度大、生产迫切需求的工作。本文简单介绍了水平井产出剖面测井技术及爬行器施工工艺,应用该技术成功完成了塔河油田TK109H等三口水平井产出剖面测井,并总结了施工经验与存在的问题,为进一步应用该技术评价生产层段产出状况提供帮助。 相似文献
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Deep Web蕴藏丰富的、高质量的信息资源,为了获取某Deep Web站点的页面,用户不得不键入一系列的关键词集。由于没有直接指向Deep Web页面的静态链接,目前大多数搜索引擎不能发现这些页面。该文提出的Deep Web爬虫爬行策略,可以有效地下载Deep Web页面。由于该页面只提供一个查询接口,因此Deep Web爬虫设计面对的主要挑战是怎样选择最佳的查询关键词产生有意义的查询。实验证明文中提出的一种基于不同关键词相关度权重的选择方法是有效的。 相似文献
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Guilherme T. de Assis Alberto H. F. Laender Marcos André Gonçalves Altigran S. da Silva 《World Wide Web》2009,12(3):285-319
Focused crawlers have as their main goal to crawl Web pages that are relevant to a specific topic or user interest, playing
an important role for a great variety of applications. In general, they work by trying to find and crawl all kinds of pages
deemed as related to an implicitly declared topic. However, users are often not simply interested in any document about a
topic, but instead they may want only documents of a given type or genre on that topic to be retrieved. In this article, we
describe an approach to focused crawling that exploits not only content-related information but also genre information present
in Web pages to guide the crawling process. This approach has been designed to address situations in which the specific topic
of interest can be expressed by specifying two sets of terms, the first describing genre aspects of the desired pages and
the second related to the subject or content of these pages, thus requiring no training or any kind of preprocessing. The
effectiveness, efficiency and scalability of the proposed approach are demonstrated by a set of experiments involving the
crawling of pages related to syllabi of computer science courses, job offers in the computer science field and sale offers
of computer equipments. These experiments show that focused crawlers constructed according to our genre-aware approach achieve
levels of F1 superior to 88%, requiring the analysis of no more than 65% of the visited pages in order to find 90% of the
relevant pages. In addition, we experimentally analyze the impact of term selection on our approach and evaluate a proposed
strategy for semi-automatic generation of such terms. This analysis shows that a small set of terms selected by an expert
or a set of terms specified by a typical user familiar with the topic is usually enough to produce good results and that such
a semi-automatic strategy is very effective in supporting the task of selecting the sets of terms required to guide a crawling
process. 相似文献
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Nina Qian Hari Krishna Bisoyi Meng Wang Shuai Huang Zhongcheng Liu Xu-Man Chen Jun Hu Hong Yang Quan Li 《Advanced functional materials》2023,33(16):2214205
In recent years, although light-driven soft actuators have attracted intense scientific attention and achieved remarkable progress, the design and construction of an intelligent robotic system with maneuverability, self-adaptability, untethered control, and greater freedom of action, in particular the omnidirectional motion capability on a plane, remains challenging. Herein, four types of photo-thermal fillers and an unprecedented twist-bend actuation mode is introduced into a liquid crystal elastomer-based soft robot. The obtained twist-bend crawling robot not only exhibits in situ rotation, four-way turning, and four-way linear motion under light irradiation with four wavelength bands (520, 655, 808, and 980 nm), but also demonstrates the ability to avoid obstacles in complex geographical environments. This work may bring a new perspective for fabrication and development of soft robots that can adapt to dynamic and complex environmental conditions. 相似文献
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本文通过交流拖动制动和爬行阶段控制方式的对比和分析,采用低频拖动方式可避免二次给电对机械、电气设备造成的冲击和电传消耗,极大提高了提升机的安全运行能力。 相似文献
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