全文获取类型
收费全文 | 453篇 |
免费 | 14篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 18篇 |
综合类 | 3篇 |
化学工业 | 66篇 |
金属工艺 | 5篇 |
机械仪表 | 6篇 |
建筑科学 | 8篇 |
能源动力 | 17篇 |
轻工业 | 20篇 |
水利工程 | 1篇 |
无线电 | 80篇 |
一般工业技术 | 67篇 |
冶金工业 | 138篇 |
原子能技术 | 2篇 |
自动化技术 | 37篇 |
出版年
2023年 | 3篇 |
2022年 | 3篇 |
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 5篇 |
2018年 | 8篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 5篇 |
2013年 | 8篇 |
2012年 | 13篇 |
2011年 | 17篇 |
2010年 | 11篇 |
2009年 | 20篇 |
2008年 | 16篇 |
2007年 | 16篇 |
2006年 | 10篇 |
2005年 | 11篇 |
2004年 | 12篇 |
2003年 | 11篇 |
2002年 | 13篇 |
2001年 | 9篇 |
2000年 | 8篇 |
1999年 | 16篇 |
1998年 | 64篇 |
1997年 | 44篇 |
1996年 | 22篇 |
1995年 | 13篇 |
1994年 | 13篇 |
1993年 | 13篇 |
1992年 | 4篇 |
1991年 | 10篇 |
1990年 | 5篇 |
1989年 | 6篇 |
1988年 | 9篇 |
1987年 | 1篇 |
1986年 | 5篇 |
1985年 | 5篇 |
1984年 | 1篇 |
1983年 | 5篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1974年 | 1篇 |
排序方式: 共有468条查询结果,搜索用时 15 毫秒
71.
H Ueyama T Kumamoto S Fukuda S Fujimoto K Sannomiya T Tsuda 《Canadian Metallurgical Quarterly》1997,14(2):169-170
We present a 28-year-old man with isolated third nerve palsy as the initial manifestation of sarcoidosis. MRI demonstrated abnormal enhancement of the cisternal portion of the right third nerve. One month after steroid therapy, he showed almost complete recovery with resolution of the contrast enhancement on MRI. This patient illustrates the usefulness of enhanced MRI for detection of cranial nerve lesions of sarcoidosis. 相似文献
72.
73.
K Matsumoto A Akimoto K Shibata S Matsuo T Muryobayashi T Sakai T Tsuda M Tsuboshima 《Canadian Metallurgical Quarterly》1981,78(4):239-248
Doses of the drugs which produce uterine contraction were given intravenously to various species of animals. Placental and ovarian circulations were measured by the thermocouple method and/or microangiography. Uterine arterial blood flow (UABF) was measured by the electromagnetic flowmeter. Both placental blood flow (PBF) and UABF decreased with the administration of ONO-802, PGE1 or PGF2 alpha to to rabbits and dogs. Oxytocin and noradrenaline also decreased PBF in rabbits. ONO-802 or PGE1 lowered arterial blood pressure (BP) in rats, rabbits and dogs. PGE2 alpha elevated BP in rats and dogs and lowered it in rabbits. Oxytocin produced no changes in PB while noradrenaline elevated BP in rabbits. Ovarian blood flow in pregnant rabbits was reduced by ONO-802, PGE1 or PGF2 alpha. Little influence was seen with oxytocin. Regarding the luteal microvasculature in pregnant rats, ONO-802, PGF2 alpha and noradrenaline exhibited vasoconstricting effects. PGF2 alpha induced abortion and decreased plasma progesterone levels. These results suggest that the inhibitory effects of ONO-802 on the uterine and placental circulation are strongly influenced by the uterine contractile effect and that the inhibitory effect on the ovarian circulation in rats is one of pharmacological effects not concerned with the abortifacient or luteolytic effect. 相似文献
74.
Acta Informatica - Tabular data structures of a relational database, placed in a paged virtual space or in some two-level storage, are discussed. To rearrange, or transpose, those data stored... 相似文献
75.
Masatoshi Tsuda Takashi Asada Toshihide Igari 《International Journal of Mechanical Sciences》2010,52(5):648-656
In this study, homogenized elastic-viscoplastic behavior of an ultra-fine plate-fin structure fabricated for compact heat exchangers is investigated. First, the homogenized behavior is numerically analyzed using a fully implicit mathematical homogenization scheme of periodic elastic-inelastic solids. A power-law creep relation is assumed to represent the viscoplasticity of base metals at high temperatures. The plate-fin structure is thus shown to exhibit significant anisotropy as well as noticeable compressibility in both the elastic and viscoplastic ranges of the homogenized behavior. Second, a non-linear rate-dependent macroscopic constitutive model is developed using the quadratic yield function proposed for anisotropic compressible plasticity. The resulting constitutive model is shown to be successful for simulating the anisotropy, compressibility, and rate dependency in the homogenized behavior in multi-axial stress states. 相似文献
76.
Kenji Tsuda 《集成电路应用》2009,(12):29-29
三洋电子有限公司(Sanyo Electric,东京)成功制作出.具有实用尺寸(100cm^2甚至更大)的超薄太阳能电池板,而且转换效率接近三洋在今年5月份报道的23%的最高纪录。该公司最新一代的HIT太阳能电池厚度只有98μm,不到该公司最高效率电池厚度的一半,而且其转换效率也高达22.8%。 相似文献
77.
Saito W. Nitta T. Kakiuchi Y. Saito Y. Tsuda K. Omura I. Yamaguchi M. 《Electron Device Letters, IEEE》2008,29(1):8-10
A boost converter with a 940-V/4.4 A GaN-HEMT as the main switching device was demonstrated to show the possibility of using high-voltage GaN-HEMTs in power electronic applications. The demonstrated circuit achieved an output power of 122 W and a power efficiency of 94.2% under a drain peak voltage as high as 350 V and a switching frequency of 1 MHz. The dual field-plate structure realized high-voltage switching operation with high power efficiency as dynamic on-resistance was suppressed by an increase of the current collapse phenomena. 相似文献
78.
Liu Zhi Tsuda Toshitaka Watanabe Hiroshi Ryuo Satoko Iwasawa Nagateru 《Mobile Networks and Applications》2019,24(3):991-1002
Mobile Networks and Applications - Natural disaster is one of the most important research topics worldwide. In this paper, a data driven cyber-physical system is introduced to detect landslides.... 相似文献
79.
Measuring accurate deformation distribution of large-scale structures inexpensively and efficiently is a crucial challenge of structural health monitoring. Phase-based imaging technique has great potential for accurate and robust multipoint displacement measurement in the field. In this study, the sampling Moiré method—one of the promising optical techniques—was applied to the displacement measurement of a concrete bridge for the high-speed railway in Japan. Using retroreflective Moiré markers, the two-dimensional in-plane displacements at multiple locations could be easily measured from recorded digital images at a distance of 20 m regardless of day and night. Results of the dynamic deflection obtained from the sampling Moiré method were in good agreement with those from a conventional laser Doppler vibrometer. The time series of two-dimensional displacement analyses when the outbound or inbound trains passed at the speed of 150 or 320 km/h through the bridge revealed that the points at the centre and the quarter of the bridge span demonstrated complex deformation behaviour showing elliptical rotation. The effects of random noise of the recorded image were quantitatively investigated, and the air fluctuation was discussed from the field experiments. We proved that measurements using the sampling Moiré method could be more stable at night than daytime. 相似文献
80.
Vaibhav Gupta Swagato Sarkar Olha Aftenieva Takuya Tsuda Labeesh Kumar Daniel Schletz Johannes Schultz Anton Kiriy Andreas Fery Nicolas Vogel Tobias A. F. König 《Advanced functional materials》2021,31(36):2105054
Imprint lithography has emerged as a reliable, reproducible, and rapid method for patterning colloidal nanostructures. As a promising alternative to top-down lithographic approaches, the fabrication of nanodevices has thus become effective and straightforward. In this study, a fusion of interference lithography (IL) and nanosphere imprint lithography on various target substrates ranging from carbon film on transmission electron microscope grid to inorganic and dopable polymer semiconductor is reported. 1D plasmonic photonic crystals are printed with 75% yield on the centimeter scale using colloidal ink and an IL-produced polydimethylsiloxane stamp. Atomically smooth facet, single-crystalline, and monodisperse colloidal building blocks of gold (Au) nanoparticles are used to print 1D plasmonic grating on top of a titanium dioxide (TiO2) slab waveguide, producing waveguide-plasmon polariton modes with superior 10 nm spectral line-width. Plasmon-induced hot electrons are confirmed via two-terminal current measurements with increased photoresponsivity under guiding conditions. The fabricated hybrid structure with Au/TiO2 heterojunction enhances photocatalytic processes like degradation of methyl orange (MO) dye molecules using the generated hot electrons. This simple colloidal printing technique demonstrated on silicon, glass, Au film, and naphthalenediimide polymer thus marks an important milestone for large-scale implementation in optoelectronic devices. 相似文献