全文获取类型
收费全文 | 198篇 |
免费 | 12篇 |
专业分类
电工技术 | 13篇 |
化学工业 | 64篇 |
金属工艺 | 3篇 |
机械仪表 | 1篇 |
建筑科学 | 2篇 |
能源动力 | 12篇 |
轻工业 | 22篇 |
水利工程 | 2篇 |
无线电 | 6篇 |
一般工业技术 | 24篇 |
冶金工业 | 41篇 |
原子能技术 | 4篇 |
自动化技术 | 16篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 6篇 |
2021年 | 7篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 4篇 |
2016年 | 9篇 |
2015年 | 4篇 |
2014年 | 9篇 |
2013年 | 14篇 |
2012年 | 5篇 |
2011年 | 2篇 |
2010年 | 8篇 |
2009年 | 8篇 |
2008年 | 7篇 |
2007年 | 9篇 |
2006年 | 7篇 |
2005年 | 4篇 |
2004年 | 8篇 |
2003年 | 3篇 |
2002年 | 6篇 |
2001年 | 6篇 |
2000年 | 2篇 |
1999年 | 5篇 |
1998年 | 18篇 |
1997年 | 9篇 |
1996年 | 6篇 |
1995年 | 2篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1977年 | 2篇 |
1974年 | 1篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1967年 | 2篇 |
排序方式: 共有210条查询结果,搜索用时 0 毫秒
51.
52.
Finkelstein Alexei V.; Nakamura Haruki 《Protein engineering, design & selection : PEDS》1993,6(4):367-372
A lack of knowledge about the construction of tight packingis now the main obstacle for a successful design of artificialproteins. In this paper we examine a way of close packing antiparallelß-sandwihes. We show that there are some weakpoints at the surfaces of ß-sheets, which cannotbe filled by the surrounding aliphatic side chains that arethe most abundant. Theoretically, these weak pointscan be filled either by aromatic side chains of the same sheetor by the residues of the other parts of the protein molecule.The analysis of protein structures shows that both possibilitiesare used by nature and that there are many cases when theseweak points are not filled by any atom. They remainfree and form a majority of the defects of close packing inprotein globules. 相似文献
53.
Susumu Fujii Hiroshi Morita Yasuto Tatsuta & Yoshiharu Takata 《International Transactions in Operational Research》2002,9(2):235-245
Agility in manufacturing requires a quick response to the changes in quantity of products without losing productivity. A high-volume flexible manufacturing system (HV-FMS) attains the high flexibility as well as the high volume production. We consider in this paper the energy-saving effect of HV-FMS from the viewpoint of consumed electric power. We take a production system of cylinder heads for automobile engines as a subject in this study, and draw a comparison of the energy-saving effect between HV-FMS and flexible transfer line to verify the effectiveness of HV-FMS. Moreover, we discuss the economic effect of high-speed processing at HV-FMS. We measure the energy-saving effect by high-speed processing and give the permissible level for additional tooling cost. 相似文献
54.
55.
Muroya A Nakano R Ohtani N Haruki M Morikawa M Kanaya S 《Journal of Bioscience and Bioengineering》2002,93(2):170-175
The gene encoding ribonuclease HII from Bacillus stearothermophilus was cloned and expressed in Escherichia coli. The overproduced protein, Bst-RNase HII, was purified and biochemically characterized. Bst-RNase HII, which consists of 259 amino acid residues, showed the highest amino acid sequence identity (50.2%) to Bacillus subtilis RNase HII. Like B. subtilis RNase HII, it exhibited Mn2+-dependent RNase H activity. It was, however, more thermostable than B. subtilis RNase HII. When the Bst-RNase HII amino acid sequence is compared with that of Thermococcus kodakaraensis RNase HII, to which it shows 29.8% identity, 30 residues are observed to be truncated from the C-terminus and there is an extension of 71 residues at the N-terminus. The C-terminal truncation results in the loss of the alpha9 helix, which is rich in basic amino acid residues and is therefore important for substrate binding. A truncated protein, Delta59-Bst-RNase HII, in which most of the N-terminal extension was removed, completely lost its RNase H activity. Surface plasmon resonance analysis indicated that this truncated protein did not bind to the substrate. These results suggest that the N-terminal extension of Bst-RNase HII is important for substrate binding. Because B. subtilis RNase HII has an N-terminal extension of the same length and these extensions contain a region in which basic amino acid residues are clustered, the Bacillus enzymes may represent a novel type of RNase H which possesses a substrate-binding domain at the N-terminus. 相似文献
56.
Kwon HJ Haruki M Morikawa M Omori K Kanaya S 《Journal of Bioscience and Bioengineering》2002,93(2):157-164
A family I.3 lipase from Pseudomonas sp. MIS38 (PML) contains 12 repeats of a nine-residue sequence motif in the C-terminal region. To elucidate the role of these repetitive sequences, mutant proteins PML5, PML4, PML1, and PML0, in which 7, 8, 11, and all 12 of the repetitive sequences are deleted, and PMLdelta19, in which 19 C-terminal residues are truncated, were constructed. Escherichia coli DH5 cells carrying the Serratia marcescens Lip system permitted the secretion of the wild-type and all of the mutant proteins except for PMLdelta19, although they were partially accumulated in the cells in an insoluble form as well. Both the secretion level and cellular content of the proteins decreased in the order PML > PML5 > PML4 > PML1 > PML0, indicating that repetitive sequences are not required for secretion of PML but are important for its stability in the cells. All the mutant proteins were purified in a refolded form and their biochemical properties were characterized. CD spectra, the Ca2+ contents, and susceptibility to chymotryptic digestion strongly suggested that the five repetitive sequences remaining in PML5 are sufficient to form a beta-roll structure, whereas the four in PML4 are not. PML5 and PMLdelta19 showed both lipase and esterase activities, whereas PML4, PML1, and PML0 were inactive. These results suggest that the enzymatic activity of PML is not seriously affected by a deletion or truncation at the C-terminal region as long as a succession of repetitive sequences can build a beta-roll structure. 相似文献
57.
58.
Haruki Ejiri Akiko Kumada Kunihiko Hidaka Taiki Donen Kentaro Kokura 《Electrical Engineering in Japan》2019,206(1):32-41
Breakdown voltages of vacuum gaps become lower when the gaps are contaminated by metallic and ceramic microparticles. In this paper, the motion of the microparticles in the gap is simulated using Monte Carlo method in order to evaluate the effect of parameters upon motion and the removal time of the microparticles. As the parameters, we focused on the material of the microparticle, the frequency, the peak value of the applied voltage, the gap length, and the diameter of the lower and upper electrodes. It turned out that the maximum time needed to remove all microparticles could be expressed as multiple regression function. It is suggested that the reliability of the microparticle removal can be increased by spark conditioning with opening/closing operation. 相似文献
59.
Takayuki Numata Hirokazu Tatsuta Yoshiaki Morita Yukitoshi Otani Norihiro Umeda 《IEEJ Transactions on Electrical and Electronic Engineering》2007,2(3):398-401
We report localized thermal processing using a laser‐trapped and heated metal nanoparticle. A metal nanoparticle trapped by a focused, continuous wave (CW), near‐infrared laser was heated by photothermal conversion and acted as a remotely controllable nanosized thermal tool for processing a workpiece. We demonstrated the processing of a glass substrate with an optically trapped gold nanoparticle (diameter 200 nm) irradiated by a Nd:YAG laser (λ = 1.064 µm, CW). Laser irradiation caused local melting of the substrate and a crater‐like nanosized imprint on the substrate, demonstrating thermal nanoprocessing of an optically transparent material. Copyright © 2007 Institute of Electrical Engineers of Japan© 2007 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
60.