全文获取类型
收费全文 | 340篇 |
免费 | 11篇 |
国内免费 | 4篇 |
专业分类
综合类 | 44篇 |
化学工业 | 33篇 |
金属工艺 | 4篇 |
机械仪表 | 1篇 |
建筑科学 | 52篇 |
矿业工程 | 6篇 |
能源动力 | 4篇 |
轻工业 | 15篇 |
水利工程 | 1篇 |
石油天然气 | 109篇 |
无线电 | 3篇 |
一般工业技术 | 6篇 |
冶金工业 | 1篇 |
原子能技术 | 1篇 |
自动化技术 | 75篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 5篇 |
2019年 | 5篇 |
2017年 | 2篇 |
2016年 | 6篇 |
2015年 | 5篇 |
2014年 | 20篇 |
2013年 | 25篇 |
2012年 | 16篇 |
2011年 | 21篇 |
2010年 | 14篇 |
2009年 | 19篇 |
2008年 | 16篇 |
2007年 | 9篇 |
2006年 | 15篇 |
2005年 | 11篇 |
2004年 | 11篇 |
2003年 | 14篇 |
2002年 | 10篇 |
2001年 | 10篇 |
2000年 | 4篇 |
1999年 | 9篇 |
1998年 | 12篇 |
1997年 | 10篇 |
1996年 | 10篇 |
1995年 | 9篇 |
1994年 | 7篇 |
1993年 | 15篇 |
1992年 | 22篇 |
1991年 | 1篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1977年 | 1篇 |
1975年 | 3篇 |
1974年 | 1篇 |
排序方式: 共有355条查询结果,搜索用时 0 毫秒
1.
低渗透率地层渗透率的确定方法 总被引:3,自引:0,他引:3
结合大庆油田外围低渗透率地层的地质特点,根椐渗流理论和岩心分析资料,分析了地层渗透率与孔隙度、组成地层的各种矿物含量以及泥质含量之间的关系,建立了不同矿物组合地层的渗透率计算方程。用本方法计算的和岩心分析的渗透率进行了对比,二者之间具有较好的一致性。 相似文献
2.
With increasing globalization, communication across language and cultural boundaries is becoming an essential requirement
of doing business, delivering education, and providing public services. Due to the considerable cost of human translation
services, only a small fraction of text documents and an even smaller percentage of spoken encounters, such as international
meetings and conferences, are translated, with most resorting to the use of a common language (e.g. English) or not taking
place at all. Technology may provide a potentially revolutionary way out if real-time, domain-independent, simultaneous speech
translation can be realized. In this paper, we present a simultaneous speech translation system based on statistical recognition
and translation technology. We discuss the technology, various system improvements and propose mechanisms for user-friendly
delivery of the result. Over extensive component and end-to-end system evaluations and comparisons with human translation
performance, we conclude that machines can already deliver comprehensible simultaneous translation output. Moreover, while
machine performance is affected by recognition errors (and thus can be improved), human performance is limited by the cognitive
challenge of performing the task in real time. 相似文献
3.
针对气测录井中外源气、二次循环气对油气显示层解释的干扰问题,该文提出了用差分色谱法来消除其影响,并就其概念和实现方法做了介绍;对差分色谱的测量条件及影响因素进行了分析,文章还列举了差分色谱的录井应用实例。在满足差分色谱测量条件的前提下,该方法有利于气测录井解释和油气水层评价,为气测录井半定量或定量解释提供一种方法和途径。 相似文献
4.
本以利用速度谱所伴生的叠加能量,采用二次曲线插值方法,寻找最大的叠加能量有所对应时间,然后利用叠加速度进行倾角校正,相位校正和最大炮检距校正,获取比较精确的层速度参数。 相似文献
5.
SUN工作站生产测井解释系统(PLASYS) 总被引:1,自引:0,他引:1
吕永军,胡亚兵,毕卓新.SUN 工作站生产测井解释系统(PLASYS).测井技术,1993;17(2):114~120Sun 工作站生产测井解释系统,是以 SUN GKS 为基本软环境支持,在 SUN 工作站上开发完成的一套生产测井资料解释与处理系统。本文详细叙述了该系统的构成、解释原理、输入输出等,并通过实例说明了该系统的解释结果。 相似文献
6.
为深化建南构造侏罗系东岳庙段陆相页岩气储层认识,对东岳庙段岩心与测井资料进行细致研究,建立东岳庙段泥页岩岩性、储层识别、储层矿物含量、孔隙度、渗透率、饱和度和含气量解释计算模型,建立一套较完善的页岩气储层综合解释评价方法。对2口井的东岳庙段页岩气储层进行精细解释,提出东岳庙段页岩气层解释参考标准。适用建南地区东岳庙段页岩气储层测井评价,可以扩展用于整个建南地区及中扬子地区陆相页岩气储层评价。 相似文献
7.
Marian Counihan 《Journal of Logic, Language and Information》2008,17(4):391-415
In this paper we explore differences in use of the so-called ‘logical’ elements of language such as quantifiers and conditionals,
and use this to explain differences in performance in reasoning tasks across subject groups with different educational backgrounds.
It is argued that quantified sentences are difficult natural bases for reasoning, and hence more prone to elicit variation
in reasoning behaviour, because they are chiefly used with a pre-determined domain in everyday speech. By contrast, it is
argued that conditional sentences form natural premises because of the function they serve in everyday speech. Implications
of this for the role of logic in modelling human reasoning behaviour are briefly considered. 相似文献
8.
This paper presents a novel global localization approach for mobile robots by exploring line-segment features in any structured environment. The main contribution of this paper is an effective data association approach, the Line-segment Relation Matching (LRM) technique, which is based on a generation and exploration of an Interpretation Tree (IT). A new representation of geometric patterns of line-segments is proposed for the first time, which is called as Relation Table. It contains relative geometric positions of every line-segment respect to the others (or itself) in a coordinate-frame independent sense. Based on that, a Relation-Table-constraint is applied to minimize the searching space of IT therefore greatly reducing the processing time of LRM. The Least Square algorithm is further applied to estimate the robot pose using matched line-segment pairs. Then a global localization system can be realized based on our LRM technique integrated with a hypothesis tracking framework which is able to handle pose ambiguity. Sufficient simulations were specially designed and carried out indicating both pluses and minuses of our system compared with former methods. We also presented the practical experiments illustrating that our approach has a high robustness against uncertainties from sensor occlusions and extraneous observation in a highly dynamic environment. Additionally our system was demonstrated to easily deal with initialization and have the ability of quick recovery from a localization failure. 相似文献
9.
吕翠娟 《宁波工程学院学报》2013,(2):122-126
随着社会的不断发展,高校英语口译课程的教学模式需要不断改革。合作学习作为一种创新的活动型教学模式,强调平等与合作,发挥学生的自主性、积极性、探究性,是英语口译课积极有效的值得推广的教学模式。 相似文献
10.