全文获取类型
收费全文 | 178篇 |
免费 | 5篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 3篇 |
化学工业 | 34篇 |
金属工艺 | 2篇 |
机械仪表 | 3篇 |
建筑科学 | 6篇 |
能源动力 | 3篇 |
轻工业 | 7篇 |
石油天然气 | 5篇 |
无线电 | 9篇 |
一般工业技术 | 27篇 |
冶金工业 | 13篇 |
原子能技术 | 1篇 |
自动化技术 | 71篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 5篇 |
2019年 | 2篇 |
2018年 | 3篇 |
2017年 | 5篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 7篇 |
2013年 | 14篇 |
2012年 | 4篇 |
2011年 | 5篇 |
2010年 | 10篇 |
2009年 | 10篇 |
2008年 | 8篇 |
2007年 | 12篇 |
2006年 | 9篇 |
2005年 | 7篇 |
2004年 | 10篇 |
2003年 | 7篇 |
2002年 | 2篇 |
2001年 | 3篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 6篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有184条查询结果,搜索用时 31 毫秒
81.
82.
Climacteric ethylene production was found to start close to the pedicel, at the proximal part of “Hass” avocado (Persea americana Mill.) fruits in the immature stages, and at the distal part of mature fruits. The start of ethylene production corresponded closely to the softening patterns in immature and mature fruits. The possibility is discussed that this phenomenon is a result of differential levels of factors which inhibit ethylene production, arriving from leaves and regulated by the sink properties of the growing seed. 相似文献
83.
84.
Pendimethalin (PM) is a dinitroaniline herbicide, highly hydrophobic and with a very low solubility in water. It is used for pre-emergence weed control, is usually applied before sowing, and mechanically incorporated into the soil. We tested sorption of PM on montmorillonite and on two different organo-montmorillonites in a mixed water–chloroform environment, to determine the feasibility of developing an environmentally oriented formulation of the herbicide. FTIR measurements show that the interactions of PM with montmorillonite on which difenzoquat (DZ) or mepiquat (MQ) were previously adsorbed are via the nitro and methyl groups of the herbicide. The pre-adsorbed organocations cause a dehydration of the interlayer space, leading to hydrophobicity of the organoclay. Changes in the electrokinetic surface charge of the organoclay, measured using a particle charge detector, confirm these results. The high affinity to PM and the hydrophobic behavior of the used organoclays were also demonstrated in experiments using a mixed chloroform–water environment. The crude clay mineral stayed in the water phase, whereas DZ- and MQ-montmorillonites concentrated in the PM-chloroform phase. Amounts of PM adsorbed to the organoclays using this method were very high (up to 0.65 mol PM kg−1 compound), which suggests a very efficient technology of preparation of herbicide-clay formulations, compared with techniques used in the past for similar herbicide-organoclay compounds. Plant experiments using the organoclay-herbicide formulation with higher amount of active ingredient (based on DZ-clay) demonstrate efficient herbicidal activity with 30% less active ingredient. 相似文献
85.
86.
Benny Pasternak Shmuel Tyszberowicz Amiram Yehudai 《International Journal on Software Tools for Technology Transfer (STTT)》2009,11(4):273-290
Unit testing plays a major role in the software development process. What started as an ad hoc approach is becoming a common
practice among developers. It enables the immediate detection of bugs introduced into a unit whenever code changes occur.
Hence, unit tests provide a safety net of regression tests and validation tests which encourage developers to refactor existing
code with greater confidence. One of the major corner stones of the agile development approach is unit testing. Agile methods
require all software classes to have unit tests that can be executed by an automated unit-testing framework. However, not
all software systems have unit tests. When changes to such software are needed, writing unit tests from scratch, which is
hard and tedious, might not be cost effective. In this paper we propose a technique which automatically generates unit tests
for software that does not have such tests. We have implemented GenUTest, a prototype tool which captures and logs interobject
interactions occurring during the execution of Java programs, using the aspect-oriented language AspectJ. These interactions
are used to generate JUnit tests. They also serve in generating mock aspects—mock object-like entities, which enable testing
units in isolation. The generated JUnit tests and mock aspects are independent of the tool, and can be used by developers
to perform unit tests on the software. Comprehensiveness of the unit tests depends on the software execution. We applied GenUTest
to several open source projects such as NanoXML and JODE. We present the results, explain the limitations of the tool, and
point out direction to future work to improve the code coverage provided by GenUTest and its scalability. 相似文献
87.
As the structural and behavioral complexity of systems has increased, so has interest in reusing modules in early development
phases. Developing reusable modules and then weaving them into specific systems has been addressed by many approaches, including
plug-and-play software component technologies, aspect-oriented techniques, design patterns, superimposition, and product line
techniques. Most of these ideas are expressed in an object-oriented framework, so they reuse behaviors after dividing them
into methods that are owned by classes. In this paper, we present a crosscutting reuse approach that applies object-process
methodology (OPM). OPM, which unifies system structure and behavior in a single view, supports the notion of a process class
that does not belong to and is not encapsulated in an object class, but rather stands alone, capable of getting input objects
and producing output objects. The approach features the ability to specify modules generically and concretize them in the
target application. This is done in a three-step process: designing generic and target modules, weaving them into the system
under development, and refining the combined specification in a way that enables the individual modules to be modified after
their reuse. Rules for specifying and combining modules are defined and exemplified, showing the flexibility and benefits
of this approach.
相似文献
Shmuel KatzEmail: |
88.
Yael Pritch Alex Rav-Acha Shmuel Peleg 《IEEE transactions on pattern analysis and machine intelligence》2008,30(11):1971-1984
The amount of captured video is growing with the increased numbers of video cameras, especially the increase of millions of surveillance cameras that operate 24 hours a day. Since video browsing and retrieval is time consuming, most captured video is never watched or examined. Video synopsis is an effective tool for browsing and indexing of such a video. It provides a short video representation, while preserving the essential activities of the original video. The activity in the video is condensed into a shorter period by simultaneously showing multiple activities, even when they originally occurred at different times. The synopsis video is also an index into the original video by pointing to the original time of each activity. Video Synopsis can be applied to create a synopsis of an endless video streams, as generated by webcams and by surveillance cameras. It can address queries like "Show in one minute the synopsis of this camera broadcast during the past day'. This process includes two major phases: (i) An online conversion of the endless video stream into a database of objects and activities (rather than frames). (ii) A response phase, generating the video synopsis as a response to the user's query. 相似文献
89.
Minimal Aspect Distortion (MAD) Mosaicing of Long Scenes 总被引:2,自引:0,他引:2
Alex Rav-Acha Giora Engel Shmuel Peleg 《International Journal of Computer Vision》2008,78(2-3):187-206
Long scenes can be imaged by mosaicing multiple images from cameras scanning the scene. We address the case of a video camera
scanning a scene while moving in a long path, e.g. scanning a city street from a driving car, or scanning a terrain from a
low flying aircraft.
A robust approach to this task is presented, which is applied successfully to sequences having thousands of frames even when
using a hand-held camera. Examples are given on a few challenging sequences. The proposed system consists of two components:
(i) Motion and depth computation. (ii) Mosaic rendering.
In the first part a “direct” method is presented for computing motion and dense depth. Robustness of motion computation has
been increased by limiting the motion model for the scanning camera. An iterative graph-cuts approach, with planar labels
and a flexible similarity measure, allows the computation of a dense depth for the entire sequence.
In the second part a new minimal aspect distortion (MAD) mosaicing uses depth to minimize the geometrical distortions of long
panoramic images. In addition to MAD mosaicing, interactive visualization using X-Slits is also demonstrated.
This research was supported by the Israel Science Foundation. Video examples and high resolution images can be viewed in . 相似文献
90.