全文获取类型
收费全文 | 474篇 |
免费 | 26篇 |
专业分类
电工技术 | 12篇 |
化学工业 | 187篇 |
金属工艺 | 11篇 |
机械仪表 | 10篇 |
建筑科学 | 16篇 |
能源动力 | 24篇 |
轻工业 | 25篇 |
石油天然气 | 2篇 |
无线电 | 26篇 |
一般工业技术 | 98篇 |
冶金工业 | 9篇 |
原子能技术 | 7篇 |
自动化技术 | 73篇 |
出版年
2023年 | 9篇 |
2022年 | 10篇 |
2021年 | 17篇 |
2020年 | 11篇 |
2019年 | 15篇 |
2018年 | 17篇 |
2017年 | 8篇 |
2016年 | 21篇 |
2015年 | 18篇 |
2014年 | 21篇 |
2013年 | 35篇 |
2012年 | 39篇 |
2011年 | 30篇 |
2010年 | 21篇 |
2009年 | 24篇 |
2008年 | 23篇 |
2007年 | 15篇 |
2006年 | 12篇 |
2005年 | 15篇 |
2004年 | 12篇 |
2003年 | 11篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 6篇 |
1999年 | 1篇 |
1998年 | 4篇 |
1997年 | 3篇 |
1996年 | 5篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 5篇 |
1990年 | 6篇 |
1989年 | 5篇 |
1988年 | 7篇 |
1987年 | 7篇 |
1986年 | 10篇 |
1985年 | 2篇 |
1984年 | 9篇 |
1983年 | 7篇 |
1982年 | 3篇 |
1981年 | 6篇 |
1980年 | 2篇 |
1979年 | 5篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有500条查询结果,搜索用时 15 毫秒
61.
62.
Kohei Ogawa 《Chemical Engineering Communications》1986,46(1):1-9
From the viewpoint of information theory, the necessity that the under size material distribution follows the exponential law is discussed and the effect of differences in the initial particle-size of the material on the energy necessary to grind is examined
It is confirmed that the concept of information entropy is useful not only to discuss the grinding efficiency by experiments but also to make clear that the energy necessary to grind is smaller as the initial particle-size of the material becomes larger. This method becomes even more useful if the amount of surface area increased is considered as well. 相似文献
It is confirmed that the concept of information entropy is useful not only to discuss the grinding efficiency by experiments but also to make clear that the energy necessary to grind is smaller as the initial particle-size of the material becomes larger. This method becomes even more useful if the amount of surface area increased is considered as well. 相似文献
63.
Shortest path, shortest spanning tree, complete graph, number of comparisons, expected complexity 相似文献
64.
Polyamides having epoxy groups and their ring-opening derivatives were prepared and characterized, and some of their properties were investigated. Reaction conditions for the low-temperature polycondensation of cis-2,3-epoxysuccinyl chloride (ESC) with aromatic diamines and the interfacial copolycondensation of ESC and adipyl chloride (AC) with aromatic diamines were established to obtain a high molecular weight polyamide having epoxy groups. In addition, the ring-opening reactions of the epoxy groups in the polyamides were carried out with various amines in order to obtain polyamides having hydrophilic pendent groups such as amino and hydroxyl. It was found that the polyamides prepared by ring-opening reaction of the epoxy group with ethylenediamine (EDA) or ethanolamine (EA) had a higher affinity for moisture than those with hexamethylenediamine (HMD) or n-butylamine (n-BA), which might be ascribed to the distance of hydrophilic groups from the polyamide chain. Those polyamides having hydrophilic pendent groups decomposed upon heating at less than 200°C. 相似文献
65.
66.
Norimasa Kashiwagi Kohei Yamashita Hiroyuki Furuta Prof. Yoshiya Ikawa Prof. 《Chembiochem : a European journal of chemical biology》2009,10(17):2745-2752
The template effect plays important roles not only in modern synthetic and enzymatic catalysis but also in the ancient “RNA‐polypeptide (RNP) world,” which has been postulated to be a crucial stage in the origin of life. To mimic primitive template catalysis of peptide ligations by RNAs, we previously reported the design and synthesis of a ternary RNP complex in which the ligation of two peptides was significantly facilitated by a template RNA with two peptide‐binding units. However, RNA molecules also promoted the ligation reaction in a nonspecific manner through electrostatic interactions between RNA and basic peptides. In this study, we suppressed this effect by reducing the length of the original template derived from the Tetrahymena intron RNA. This modification, however, decreased the template ability for the specific reaction. As an alternative RNA that was as effective as the original template, we found that a self‐dimerizing RNA was a promising template for peptide ligation without a nonspecific effect. 相似文献
67.
Low Capture Switching Activity Test Generation for Reducing IR-Drop in At-Speed Scan Testing 总被引:1,自引:1,他引:0
Xiaoqing Wen Kohei Miyase Tatsuya Suzuki Seiji Kajihara Laung-Terng Wang Kewal K. Saluja Kozo Kinoshita 《Journal of Electronic Testing》2008,24(4):379-391
At-speed scan testing, based on ATPG and ATE, is indispensable to guarantee timing-related test quality in the DSM era. However,
at-speed scan testing may incur yield loss due to excessive IR-drop caused by high test (shift & capture) switching activity.
This paper discusses the mechanism of circuit malfunction due to IR-drop, and summarizes general approaches to reducing switching
activity, by which highlights the problem of current solutions, i.e. only reducing switching activity for one capture while
the widely used at-speed scan testing based on the launch-off-capture scheme uses two captures. This paper then proposes a
novel X-filling method, called double-capture (DC) X-filling, for generating test vectors with low and balanced capture switching activity for two captures. Applicable to dynamic & static
compaction in any ATPG system, DC X-filling can reduce IR-drop, and thus yield loss, without any circuit/clock modification, timing/circuit overhead, fault coverage
loss, and additional design effort.
相似文献
Xiaoqing WenEmail: |
68.
Solar Cells: Self‐Organized Superlattice and Phase Coexistence inside Thin Film Organometal Halide Perovskite (Adv. Mater. 8/2018) 下载免费PDF全文
69.
Kohei Murase Patrik Stenlund Peter Thomsen Jukka Lausmaa Anders Palmquist 《Journal of materials science. Materials in medicine》2018,29(7):104
In the present study, a model for simulations of removal torque experiments was developed using finite element method. The interfacial retention and fracturing of the surrounding material caused by the surface features during torque was analyzed. It was hypothesized that the progression of removal torque and the phases identified in the torque response plot represents sequential fractures at the interface. The 3-dimensional finite element model fairly accurately predicts the torque required to break the fixation of acid-etched implants, and also provides insight to how sequential fractures progress downwards along the implant side. 相似文献
70.
Niidome T Akiyama Y Shimoda K Kawano T Mori T Katayama Y Niidome Y 《Small (Weinheim an der Bergstrasse, Germany)》2008,4(7):1001-1007
Gold nanorods showing surface plasmon (SP) bands in the near-IR region are used as bioimaging probes that respond to near-IR light in mice. The SP bands of intravenously injected polyethylene glycol-modified gold nanorods are directly monitored from the mouse abdomen by using a spectrophotometer equipped with an integrating sphere. The absorbance at 900 nm from the gold nanorods immediately increases after injection and reaches a plateau. The injection of phosphatidylcholine-modified gold nanorods also increases the absorbance at 900 nm, but the absorbance decreases single exponentially with a 1.3-min half-life. In vivo spectral changes of gold nanorods depend on the surface characteristics, and can be observed in real time using simple spectroscopic measurements. 相似文献