全文获取类型
收费全文 | 588篇 |
免费 | 8篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 49篇 |
综合类 | 3篇 |
化学工业 | 167篇 |
金属工艺 | 10篇 |
机械仪表 | 8篇 |
建筑科学 | 17篇 |
能源动力 | 15篇 |
轻工业 | 44篇 |
水利工程 | 4篇 |
石油天然气 | 1篇 |
无线电 | 38篇 |
一般工业技术 | 82篇 |
冶金工业 | 117篇 |
原子能技术 | 12篇 |
自动化技术 | 30篇 |
出版年
2023年 | 3篇 |
2022年 | 8篇 |
2021年 | 13篇 |
2020年 | 6篇 |
2019年 | 4篇 |
2018年 | 3篇 |
2017年 | 4篇 |
2016年 | 11篇 |
2015年 | 2篇 |
2014年 | 11篇 |
2013年 | 22篇 |
2012年 | 15篇 |
2011年 | 26篇 |
2010年 | 11篇 |
2009年 | 15篇 |
2008年 | 36篇 |
2007年 | 25篇 |
2006年 | 19篇 |
2005年 | 30篇 |
2004年 | 26篇 |
2003年 | 23篇 |
2002年 | 22篇 |
2001年 | 9篇 |
2000年 | 14篇 |
1999年 | 14篇 |
1998年 | 42篇 |
1997年 | 26篇 |
1996年 | 15篇 |
1995年 | 16篇 |
1994年 | 14篇 |
1993年 | 14篇 |
1992年 | 8篇 |
1991年 | 5篇 |
1990年 | 5篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1985年 | 12篇 |
1984年 | 13篇 |
1983年 | 3篇 |
1982年 | 6篇 |
1981年 | 4篇 |
1980年 | 5篇 |
1979年 | 3篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1976年 | 7篇 |
1972年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有597条查询结果,搜索用时 15 毫秒
41.
S Enosawa S Suzuki M Fujino H Amemiya T Omasa S Urayama N Tanimura K Suga 《Canadian Metallurgical Quarterly》1997,6(5):537-540
Ureteral triplication is a rare congenital anomaly of the upper urinary tract. It is reported to be associated with an increased incidence of congenital anomalies as well as a predisposition to infection and calculus formation. We report a case of type 1 variant of ureteral triplication associated with vesicoureteral reflux into lower and mid pole ureters in a solitary kidney. To our knowledge ureteral triplication in a solitary kidney has not been described previously. 相似文献
42.
Due to the recent popularization of mobile multimedia broadcasting, broadcasting continuous media data such as audio and video has attracted great deal of attention. In general continuous media data broadcasting, since clients have to wait to receive data before playing it, various schemes to reduce waiting time have been studied. Some reduce the waiting time by dividing the data into several segments and broadcasting preceding segments frequently with a single channel. However, by dividing the data into numerous segments and producing an effective broadcast schedule, the waiting time can be further reduced. In this paper, we propose a scheduling protocol to reduce waiting time with large-scale data segmentation. 相似文献
43.
It is necessary to use renewable energy, such as photovoltaic, wind power, and biomass energy, from the viewpoint of CO2 regulation and environmental protection of the Earth. In recent years, the tendency is toward larger wind power generation systems to achieve cheaper electricity. Generators having capacities of 1500 kW to 2000 kW tend to dominate the market. However, a large wind power generation system has limitations in terms of location and can be installed only in the suburbs. At the same time, a city‐type compact wind power generation system, designed for city needs, has more flexibility and can be installed in the residential areas of a city. In this paper, we introduce an original control operation system called a “pump‐up” operation system, designed to effectively use the city wind, and report the results of its field test. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 158(2): 56–63, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20440 相似文献
44.
A passive aerodynamic control method for suppression of the wind-induced instabilities of a very long span bridge is presented in this paper. The control system consists of additional control flaps attached to the edges of the bridge deck. Control flap rotations are governed by prestressed springs and additional cables spanned between the control flaps and an auxiliary transverse beam supported by the main cables of the bridge. The rotational movement of the flaps is used to modify the aerodynamic forces acting on the deck and provides aerodynamic forces on the flaps used to stabilize the bridge. A time-domain formulation of self-excited forces for the whole three-dimensional suspension bridge model is obtained through a rational function approximation of the generalized Theodorsen function and implemented in the FEM formulation. This paper lays the theoretical groundwork for the one that follows. 相似文献
45.
Five sterylglycosides (acylmono-, mono-, di tri- and tetraglycosylsterol) and a saponin were isolated from Adzuki beans and
characterized. In the glycosylsterols, the principal component sterols were sitosterol and stigmasterol; the major sugar component
was glucose. The glucose units were shown to be linked by β1,6-bonds. The three oligoglycosylsterols were shown to be gentiobiosylsterol,
gentiotriosylsterol and gentiotetraosylsterol; the latter two are novel sterylglycosides. The saponin was identified as glucopyranosyl-(β1→2)-glucopyranurosyl-(β1→3′)-soyasapogenol
B (Azukisaponin I) which had previously been found in Adzuki beans. 相似文献
46.
Fuma S Ban-nai T Doi M Fujimori A Ishii N Ishikawa Y Kawaguchi I Kubota Y Maruyama K Miyamoto K Nakamori T Takeda H Watanabe Y Yanagisawa K Yasuda T Yoshida S 《Radiation protection dosimetry》2011,146(1-3):295-298
Some studies for radiological protection of the environment have been made at the National Institute of Radiological Sciences (NIRS). Transfer of radionuclides and related elements has been investigated for dose estimation of non-human biota. A parameter database and radionuclide transfer models have been also developed for the Japanese environments. Dose (rate)-effect relationships for survival, growth and reproduction have been investigated in conifers, Arabidopsis, fungi, earthworms, springtails, algae, duckweeds, daphnia and medaka. Also genome-wide gene expression analysis has been carried out by high coverage expression profiling (HiCEP). Effects on aquatic microbial communities have been studied in experimental ecosystem models, i.e., microcosms. Some effects were detected at a dose rate of 1 Gy day(-1) and were likely to arise from interspecies interactions. The results obtained at NIRS have been used in development of frameworks for environmental protection by some international bodies, and will contribute to environmental protection in Japan and other Asian countries. 相似文献
47.
Hibi Y Asai K Arafuka H Hamajima M Iwama T Kawai K 《Journal of Bioscience and Bioengineering》2011,111(5):547-549
La(3+) and not Ca(2+) increases methanol dehydrogenase (MDH) activity in Methylobacterium radiotolerans NBRC15690. La(3+)- and Ca(2+)-MDH-like proteins were found to be homodimeric (α(2)) and heterotetrameric (α(2)β(2)), respectively. N-terminal amino acid sequences of these proteins revealed that La(3+)- and Ca(2+)-MDH-like proteins were encoded by xoxF and mxaFI, respectively. 相似文献
48.
The present paper examines the accuracy of two models used to predict the capacity of single square plate anchors used in multi-anchor wall (MAW) systems constructed in Japan. Measured anchor plate capacities from full-scale in situ load tests reported in the literature are compared to predicted values using the analytical model recommended in Japan. A modified anchor capacity model is proposed that preserves the general form of the PWRC equation, but introduces correction factors to improve accuracy. The correction factors are empirically-based and are selected by back-fitting measured loads to achieve a resistance bias mean equal to one and a low coefficient of variation (COV) in bias values. The results of a large number of small-scale anchor capacity tests carried out in pullout boxes were used to guide the selection of back-fitted parameters. The correction factors account for the influence of the confining pressure (anchor depth), the plate size and the anchor rod length on the anchor plate capacity. New Nc and Nq factors are also presented as part of the new model. The bias statistics for the two models comprise an important contribution to future reliability-based calibrations of the ultimate anchor capacity limit state for MAW systems in Japan. 相似文献
49.
K Tayama H Akashi T Fujino T Okazaki S Aoyagi 《Canadian Metallurgical Quarterly》1998,51(13):1074-1079
50.