全文获取类型
收费全文 | 6966篇 |
免费 | 155篇 |
国内免费 | 15篇 |
专业分类
电工技术 | 362篇 |
综合类 | 6篇 |
化学工业 | 1623篇 |
金属工艺 | 204篇 |
机械仪表 | 146篇 |
建筑科学 | 130篇 |
矿业工程 | 2篇 |
能源动力 | 197篇 |
轻工业 | 577篇 |
水利工程 | 23篇 |
石油天然气 | 2篇 |
无线电 | 692篇 |
一般工业技术 | 1193篇 |
冶金工业 | 1331篇 |
原子能技术 | 160篇 |
自动化技术 | 488篇 |
出版年
2022年 | 51篇 |
2021年 | 101篇 |
2020年 | 56篇 |
2019年 | 55篇 |
2018年 | 89篇 |
2017年 | 84篇 |
2016年 | 139篇 |
2015年 | 84篇 |
2014年 | 149篇 |
2013年 | 312篇 |
2012年 | 256篇 |
2011年 | 332篇 |
2010年 | 205篇 |
2009年 | 290篇 |
2008年 | 283篇 |
2007年 | 248篇 |
2006年 | 203篇 |
2005年 | 228篇 |
2004年 | 180篇 |
2003年 | 180篇 |
2002年 | 192篇 |
2001年 | 170篇 |
2000年 | 145篇 |
1999年 | 188篇 |
1998年 | 534篇 |
1997年 | 326篇 |
1996年 | 290篇 |
1995年 | 176篇 |
1994年 | 178篇 |
1993年 | 156篇 |
1992年 | 90篇 |
1991年 | 84篇 |
1990年 | 75篇 |
1989年 | 66篇 |
1988年 | 72篇 |
1987年 | 66篇 |
1986年 | 71篇 |
1985年 | 68篇 |
1984年 | 77篇 |
1983年 | 70篇 |
1982年 | 62篇 |
1981年 | 50篇 |
1980年 | 63篇 |
1979年 | 43篇 |
1978年 | 41篇 |
1977年 | 35篇 |
1976年 | 59篇 |
1975年 | 21篇 |
1974年 | 35篇 |
1973年 | 23篇 |
排序方式: 共有7136条查询结果,搜索用时 46 毫秒
71.
Monolithic rat-race mixers for millimeter waves 总被引:1,自引:0,他引:1
Matsuura H. Tezuka K. Aoki I. Yamanaka M. Kobayashi S. Fujita T. Miura A. 《Microwave Theory and Techniques》1998,46(6):839-841
In this paper, we report on fully monolithic millimeter-wave Schottky-barrier diode (SBD) down-converters with an IF amplifier using heterojunction bipolar transistors (HBT's). A rat-race circuit is used for the mixer, and is analyzed using a harmonic-balance simulator. The measured conversion gain and the isolation are 7.1 and 29 dB in the V-band design, and 8.0 and 25 dB in the W-band design, respectively. The conversion gains are matched well with the circuit simulation 相似文献
72.
Comparison of the effect of a proteolytic enzyme dispase and a chelator for the preparation of epidermal sheet from nude mice. 总被引:1,自引:0,他引:1
Histochemical studies of epidermal Langerhans cells require well-preserved epidermal sheets. We studied the conditions for the preparation of the epidermal sheets from the skin of the ear, hind limb and trunk of nude mice. Two types of commercial dispase, and ethylenediaminetetraacetic acid (EDTA), were used at several concentrations and the effects were compared. Dermo-epidermal separation was evaluated by the preservation of ATPase activity of Langerhans cells in the epidermal sheet and by the ultrastructure of epidermal cells (Langerhans cells and keratinocytes) as well as epidermal-dermal junction. Good separation depended on the combination of the concentration of the reagent and site of the skin. The concentrations of both dispase and EDTA effective for separation of the epidermis in the nude mouse were lower than those in other mouse strains reported. 相似文献
73.
I Kobayashi M Hasegawa S Miyazaki M Nishida S Goto 《Canadian Metallurgical Quarterly》1993,67(6):528-534
Pseudomonas aeruginosa Nos. 1 and 5, each co-existing growth-inhibitor-producing and -nonproducing cells, were used in this study. An equal number of both cells (each 10(8) CFU/mouse) was challenged intraperitoneally to mice, and these cells in the heart blood and kidneys of mice were determined. Furthermore, the effect of piperacillin, ceftazidime and sisomicin on the cell distribution in mice was studied in the model infection due to P. aeruginosa Nos. 1 and 5. As a control experiment both cells of P. aeruginosa No. 1 were each challenged intraperitoneally at a dose of 10(8) CFU/mouse to mice of two groups, but there were no marked differences between the two types in cell counts of the heart blood or kidneys 9 hours after challenge. When a concomitant challenge of both cells (each 10(8) CFU/mouse) was performed in mice, the number of growth-inhibitor-producing cells of the heart blood and kidneys was about 100 times greater than that of the non-producing cells. These in vivo results were well comparable to the previous in vitro results and indicated that the inhibitor affected the invasion of the non-producing bacteria in the body in the model infection due to P. aeruginosa isolates consisting of the two types of cells. Similar results were obtained in mice with the model infection due to P. aeruginosa No. 5. Anti-pseudomonal drugs such as piperacillin (50 mg/mouse) and ceftazidime (50 mg/mouse) and sisomicin (1 mg/mouse) were given intramuscularly to mice infected concomitantly with both cells of P. aeruginosa No. 1.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
74.
Motonobu Yoshikawa Hiroshi Nakajima Takeshi Inada Yasushi Harada Masahiko Amano Yuji Nakata 《Electrical Engineering in Japan》1995,115(7):29-39
A new practical method is proposed which gives a quasi-optimal solution of the dynamic load-dispatching problem formulated by a multiconstraint multiobjective optimization problem. Here, the multiple constraints are rate reserve constraints and power flow ones, and the multiple objectives are fuel cost and CO2 emission. The proposed method is an integration of the following three techniques: (1) “Group Dispatch Scheme,” which is developed by the authors, is used to satisfy a violated constraint easily. This scheme consists of three steps. The first step is to classify all generators into two groups. One is the group which should be more loaded to satisfy the violated constraint, and the other is the should-be less loaded group. The second step is to add some load to the former group, and to subtract the same load from the latter. The third step is to dispatch each group load to each groups generators, respectively; (2) the dynamic load-dispatching algorithm is used which provides, in practical time, quasi-optimal generation trajectories; (3) the conventional weighting parametric method is used to obtain a Pareto optimal solution of multiobjective problems. The effectiveness of the method is clarified by a computer simulation on the actual power system of Kansai Electric Power Company. 相似文献
75.
76.
Yoshinobu Ohara Takeshi Taki Masaru Miyayama Hiroaki Yanagida 《Journal of Materials Science》1996,31(20):5327-5332
The sintering of fibrous BaTiO3 powder particles was investigated. Special emphasis was given to the role of particle orientation in the compact on densification and microstructure development. Compacts were made by dry-pressing. During the initial stage of sintering, the fibrous particles rearranged and bundles of particles were formed. The volume of pores between bundles of particles decreased on further heating. Grain growth started when the sintered density reached ca. 56% of the theoretical density. Higher temperatures of sintering increased the degree of the crystal axis orientation. Thus, highly orientated sintered bodies with high densities were prepared by heating at 1500 °C. 相似文献
77.
Kenta Miura Takeshi Tanemura Shunya Yamamoto Masaki Sugimoto 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2007,263(2):532-534
We fabricated fused-silica substrates which emit blue light by using Si-ion implantation and high-temperature annealing. Photoluminescence peak wavelengths are around 400 nm, and the peak intensities can be remarkable after annealing above 1150 °C. 相似文献
78.
S Tanihara T Zhang T Ojima Y Nakamura H Yanagawa M Kobayashi 《Canadian Metallurgical Quarterly》1997,44(9):688-693
A secondary medical area is defined as a medical administrative area under the Medical Care Law by which every prefectural government is expected to provide general medical care supplies such as beds for inpatients. This study evaluated the distribution in medical supplies among the secondary medical areas in Japan and the correlation between medical supply and demand. The numbers of hospital inpatients (residence of patients), physicians, and general beds excluding those for mental disorders and tuberculosis were analysed in relation to the population in all secondary medical areas in Japan. Those data were obtained from surveys conducted by the Ministry of Health and Welfare. The main results were as follows; 1) The distribution of physicians and general hospital beds among the secondary medical areas was not equal. 2) Even adjusted for the sex and age distribution, the highest hospital inpatients/population ratio among the secondary medical areas was four times as large as that of the lowest. 3) With multiple regression models, two independent variables (normal hospital beds/population ratio and aged 65 and over/total population ratio) accounted about 60% of the variance in hospital inpatients/population ratio. 4) The differences in medical supplies among the secondary medical areas may cause the differences in hospital inpatients/population ratio. 相似文献
79.
Tada Y. Kobayashi Y. Yamabayashi Y. Matsuoka S. Hagimoto K. 《Selected Areas in Communications, IEEE Journal on》1996,14(5):914-922
Photonic networks based on wavelength division multiplexing (WDM) and optical path technologies are expected to realize flexible, transparent, and cost-effective transport networks with a large transmission capacity. This paper explores the design framework of photonic transport networks taking into consideration the operation administration and maintenance (OA&M) functions required for the successful introduction of WDM systems based on the optical path concept. From the view point of network maintenance, clear distinction is made between the optical path layer and the optical section layer to facilitate accurate and smooth failure localization. The digital multiplexing span between physical multiplexing interfaces at the end-to-end digital nodes should have the same maintenance span as the corresponding optical path. We argue that cooperative maintenance by OA&M functions at both the digital and optical layers can be a practical way of network supervision. A supervisory (SV) signal transfer method and a configuration that is suitable for the terrestrial trunk network are also indicated. As an example, a practical SV system design methodology and an actual procedure developed for a single channel optical transmission system based on optical in-line amplifiers are introduced. Furthermore, application of the developed SV system and network restoration schemes is discussed for future WDM-based photonic networks. The OA&M aspects introduced will be valuable for creating future photonic network systems 相似文献
80.
The influence of multi-coatings of LaB6-Si/polycarbosilane/SiO2 on the oxidation behaviour of carbon/carbon composite materials was investigated in the temperature range from 500 to 1400 °C. The additives of LaB6-Si offered lower oxidation rates and accelerated increases in oxidation rates at temperatures below 900 °C. The coating of polycarbosilane (PCS) improved the compatibility of the coating on the carbon/carbon composite and lowered the oxidation rates of the LaB6-Si coated composite below the transition temperature. With the SiO2 coating, the cracks of the LaB6-Si/PCS coating was sealed and a good oxidation resistance of the LaB6-Si/PCS/SiO2 coated composite was found at temperatures up to 1300 °C. 相似文献