全文获取类型
收费全文 | 4592篇 |
免费 | 65篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 227篇 |
综合类 | 8篇 |
化学工业 | 870篇 |
金属工艺 | 94篇 |
机械仪表 | 115篇 |
建筑科学 | 76篇 |
能源动力 | 204篇 |
轻工业 | 306篇 |
水利工程 | 10篇 |
石油天然气 | 5篇 |
无线电 | 622篇 |
一般工业技术 | 737篇 |
冶金工业 | 972篇 |
原子能技术 | 111篇 |
自动化技术 | 301篇 |
出版年
2023年 | 23篇 |
2022年 | 42篇 |
2021年 | 54篇 |
2020年 | 28篇 |
2019年 | 34篇 |
2018年 | 43篇 |
2017年 | 47篇 |
2016年 | 72篇 |
2015年 | 52篇 |
2014年 | 84篇 |
2013年 | 163篇 |
2012年 | 102篇 |
2011年 | 198篇 |
2010年 | 140篇 |
2009年 | 164篇 |
2008年 | 199篇 |
2007年 | 146篇 |
2006年 | 122篇 |
2005年 | 123篇 |
2004年 | 127篇 |
2003年 | 144篇 |
2002年 | 123篇 |
2001年 | 122篇 |
2000年 | 87篇 |
1999年 | 155篇 |
1998年 | 399篇 |
1997年 | 258篇 |
1996年 | 208篇 |
1995年 | 134篇 |
1994年 | 131篇 |
1993年 | 88篇 |
1992年 | 65篇 |
1991年 | 73篇 |
1990年 | 65篇 |
1989年 | 58篇 |
1988年 | 65篇 |
1987年 | 47篇 |
1986年 | 56篇 |
1985年 | 41篇 |
1984年 | 48篇 |
1983年 | 37篇 |
1982年 | 24篇 |
1981年 | 29篇 |
1980年 | 43篇 |
1979年 | 30篇 |
1978年 | 29篇 |
1977年 | 32篇 |
1976年 | 46篇 |
1974年 | 12篇 |
1973年 | 14篇 |
排序方式: 共有4658条查询结果,搜索用时 15 毫秒
71.
Y. Nishida T. Kanamori Y. Ohishi M. Yamada K. Kobayashi S. Sudo 《Photonics Technology Letters, IEEE》1997,9(3):318-320
The highest reported single-pass gain coefficient of 0.36 dB/mW has been achieved using a newly developed Pr/sup 3+/-doped high-NA PbF/sub 2//InF/sub 3/-based fluoride fiber, with a /spl Delta/n of 6.6%, a core diameter of 1.2 /spl mu/m and a transmission loss of 250 dB/km at 1.2 /spl mu/m. This fiber was used to construct an efficient PDFA module with a MOPA-LD. A small-signal net gain of 22.5 dB was achieved at 1.30 /spl mu/m with a pump power of 23m mW. 相似文献
72.
A new receiving planar array antenna for DBS (direct broadcasting satellite) is proposed. The element antenna is a short waveguide aperture mounted in the ground plane, loaded with a dielectric and polarizers, and excited through its side wall by another feeding rectangular waveguide. The gain of the element antenna loaded with a dielectric is so high that the grating lobes can be reduced sufficiently even if the element spacing in the array is wider than the wavelength in free space. Therefore we can reduce the number of the array elements, and parallel feeding by the low loss waveguide network can be feasible to provide a planar array antenna. This paper describes the experimental results of several kinds of the circularly polarized dielectric-loaded element antennas and the planar antennas fed by the waveguide network. In the 12 GHz band the planar antenna with 64-element radiators has a maximum gain of 31.9 dBi with an aperture efficiency of 94.7%, the 1 dB-down frequency bandwidth of the gain is about 800 MHz (6.7% for a center frequency of 11.85 GHz), and the frequency bandwidth of the axial ratio is less than 1 dB of 850 MHz (7.2%) 相似文献
73.
A gain-flattened erbium-doped silica fibre amplifier (EDSFA) has been developed for amplifying WDM signals in the S-band. The EDSFA exhibits a signal gain of over 21 dB, a gain excursion of less than 1.9 dB, and a noise figure of less than 6.7 dB in the 1491-1518 nm wavelength range 相似文献
74.
NiInGe ohmic contact materials, which are attractive to use in future GaAs devices, were previously developed in our laboratories.
Although the NiInGe contacts provided low contact resistances of about 0.3 Ω-mm and excellent thermal stability, further reduction
of the contact resistance (RC) of the NiInGe contacts was mandatory to use these contacts in submicron devices. In this paper, the microstructural parameters,
which influence the RC values, were investigated by correlating the RC values with the microstructure at the interface between the contact materials and the GaAs substrate. The RC values of the NiInGe contacts were found to depend strongly on the volume fraction and the In concentration (x) of the InxGa1−xAs compound semiconductor layers, which were formed at the metal/GaAs interface. Both the volume fraction and the In concentration
of the InxGa1−xAs layers were found to depend on the thickness of the In layer used in the NiInGe contact and the annealing temperature to
form the ohmic contact. A RC value of 0.18 Ω-mm was obtained for the Ni (18 nm)/In (13 nm)/Ge (30 nm) contact (where a slash “/” indicates the deposition
sequence) after annealing at temperature of 650°C for 5 sec. 相似文献
75.
A quick and simple method for the identification of meat species and meat products by PCR assay 总被引:5,自引:0,他引:5
Matsunaga T Chikuni K Tanabe R Muroya S Shibata K Yamada J Shinmura Y 《Meat science》1999,51(2):143-148
The polymerase chain reaction (PCR) was applied to identify six meats (cattle, pig, chicken, sheep, goat and horse) as raw materials for products. By mixing seven primers in appropriate ratios, species-specific DNA fragments could be identified by only one multiplex PCR. A forward primer was designed on a conserved DNA sequence in the mitochondrial cytochrome b gene, and reverse primers on species-specific DNA sequences for each species. PCR primers were designed to give different length fragments from the six meats. The products showed species-specific DNA fragments of 157, 227, 274, 331, 398 and 439 bp from goat, chicken, cattle, sheep, pig and horse meats, respectively. Identification is possible by electrophoresis of PCR products. Cattle, pig, chicken, sheep and goat fragments were amplified from cooked meat heated at 100 or 120°C for 30 min, but horse DNA fragments could not be detected from the 120°C sample. Detection limits of the DNA samples were 0.25 ng for all meats. 相似文献
76.
We cloned the brlA gene from Aspergillus oryzae genomic DNA using the A. nidulans brlA gene as a probe. A 3.1-kb EcoRI-BalI genomic DNA fragment was cloned and sequenced. The deduced amino acid sequence revealed 70% identity with A. nidulans BRLA and contained two C2H2 zinc finger motifs in its carboxyl terminus, and the promoter sequence contained a 43-bp highly conserved region, indicating that the cloned gene was an A. oryzae homologue of A. nidulans brlA. Disruption of the brlA gene by homologous recombination resulted in the loss of ability to form conidiophores. These results suggest that the brlA gene of A. oryzae plays a fundamental role in controlling conidiophore development. When the brlA gene was expressed under the control of the amyB promoter in A. oryzae transformants, highly differentiated and compact colonies were observed on a solid medium. The misscheduled expression of the brlA gene in submerged culture, in which conidiation does not normally occur, caused the development of complex conidiophore structures with vesicles, phialides and conidia. 相似文献
77.
Iemura Y Yamada T Takahashi T Furukawa K Hara S 《Journal of Bioscience and Bioengineering》1999,88(3):276-280
In the supernatant of sokujo-moto, a high level of acid carboxypeptidase (ACP) activity and a large amount of peptides were observed, however, the amount of free amino acids liberated was small. In order to determine why these peptides were not hydrolyzed to any significant degree by the ACP, the properties of the peptides in sokujo-moto were investigated in this study. Peptides were fractionated from sokujo-moto by ion exchange column chromatography. ACP purified from rice-koji (rice overgrown with Aspergillus oryzae) was allowed to react with the peptides, and it was found that they were not hydrolyzed to any significant degree by the enzyme. Gel filtration chromatography was performed to ascertain the molecular size distribution of the peptides in sokujo-moto, and it was revealed that they were of low molecular sizes; molecular size: mainly in the range of 200-400, and chain length: 2-3. ACP purified from rice-koji was also allowed to react with various synthetic peptides, and it was found that ACP of rice-koji could not rapidly hydrolyze low-molecular-size peptides, such as dipeptides or tripeptides. Acid protease (AP) purified from rice-koji released peptides of molecular sizes mainly in the range of 300-600 or above from rice protein under acidic conditions (pH 3.6; the pH of sokujomoto). When AP and ACP were allowed to act at the same time on rice protein, mainly low-molecular-size peptides (molecular sizes mainly in the range of 200-400) were produced. From these results, it was estimated that AP released peptides with molecular sizes mainly in the range of 300-600 or above from rice protein and ACP degraded the relatively higher molecular size peptides among them to lower molecular size peptides; consequently only low-molecular-size peptides with molecular sizes mainly in the range of 200-400 were released in the supernatant of sokujo-moto. 相似文献
78.
Hamamoto R Seko H Kamimura R Yamada K Murai K Kamihira M Iijima S 《Journal of Bioscience and Bioengineering》1999,88(3):310-315
We examined growth control of adult and fetal hepatocytes by regulating the expression of cell-cycle-related proteins using antisense S-oligonucleotides to tumor suppressors retinoblastoma (RB) protein and p53, and cyclin-dependent kinase (CDK) inhibitors p21 and p27. The protein expression in both adult and fetal hepatocytes was significantly suppressed with the addition of corresponding antisense oligonucleotides at a concentration of 2.5 microM. For the evaluation of growth, 3H-thymidine incorporation and DNA content were measured and the results demonstrated that all the antisense oligonucleotides had growth-promoting effects and the promoting potential was equivalent or slightly greater than that with the addition of hepatocyte growth factor (HGF) (10 ng/ml). The growth-promoting effect of the antisense oligonucleotides was enhanced by HGF in both adult and fetal hepatocyte cultures, and the effects on hepatocyte growth were also observed in a suspension culture. 相似文献
79.
Yamada T. Nakata Y. Hasegawa J. Amano N. Shibayama A. Sasago M. Matsuo N. Yabu T. Matsumoto S. Okada S. Inoue M. 《Solid-State Circuits, IEEE Journal of》1991,26(11):1506-1510
A 64-Mb dynamic RAM (DRAM) has been developed with a meshed power line (MPL) and a quasi-distributed sense-amplifier driver (qDSAD) scheme. It realizes high speed, t RAS=50 ns (typical) at V cc=3.3 V, and 16-b input/output (I/O). This MPL+qDSAD scheme can reduce sensing delay caused by the metal layer resistance. Furthermore, to suppress crosstalk noise, a V SS shield peripheral layout scheme has been introduced, which also widens power line widths. This 64-Mb DRAM was fabricated with 0.4-μm CMOS technology using KrF excimer laser lithography. A newly developed memory cell structure, the tunnel-shaped stacked-capacitor cell (TSSC), was adapted to this 64-Mb DRAM 相似文献
80.
A vertical space-diversity antenna has been developed in order to achieve a diversity scheme while maintaining the simple appearance of a trunk-lid antenna. It is shown that small correlation coefficients can be achieved by a separation of approximately 0.5 wavelengths. Differences in the upper and lower antenna radiation patterns are clarified as being caused by mutual coupling of these antennas, and an incoming wave spread of more than 20° is the main reason for reduction of the correlation coefficients. Field tests in the Tokyo metropolitan area have indicated that adequate correlation coefficients and an adequate received signal level can be achieved. Moreover, calculation estimations are confirmed by the experimental results 相似文献