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101.
102.
Preparation and properties of fine hematite powders by hydrolysis of iron carboxylate solutions 总被引:2,自引:0,他引:2
Yasuhiro Konishi Takeshi Kawamura Satoru Asai 《Metallurgical and Materials Transactions B》1994,25(2):165-170
Submicrometer, crystalline hematite (α-Fe2O3) particles were prepared by hydrolysis of organic iron carboxylate solutions using water at 175 °C for 30 minutes. The particle
size of hematite was significantly dependent on the liquid-phase stirring speed and the organic compositions. The precipitation
rate of hematite from the organic solution followed first-order kinetics. The precipitation rate increased markedly with increasing
temperature, and the activation energy for the process was 94.6 kJ mol−1. At 220 °C, the hydrolysis of iron carboxylate solution led to a mixture of hematite and magnetite (Fe3O4). The iron oxides prepared at 175 °C to 220 °C were found to be free from organic contamination by the starting material. 相似文献
103.
T Mori M Arisawa M Seike S Honda M Fukuoka Y Kamimura M Morimoto M Kurisaka K Mori 《Canadian Metallurgical Quarterly》1993,21(5):431-435
It is important to detect predictive factors for in-hospital and delayed mortality of patients with subarachnoid hemorrhage (SAH) due to ruptured aneurysm. Forty-eight patients with initial bleeding of aneurysmal SAH were referred to our hospital from January 1982 to December 1985. In-hospital mortality was 16.7% (8 to 48), and 15% (6) of forty patients died later during the follow-up period. Using the Kaplan-Meier method we were able to conclude that, cumulatively, there was 70.8% probability that much patients would survive for 10 years. We analysed predictive factors of in-hospital and delayed mortality retrospectively. The most significant predictive factor for in-hospital mortality was SAH grading on admission, and for delayed mortality (29.2%) age on admission was the best predictive factor. In fact, two patients died with cardiac event during the follow-up period. This result suggests that, although the SAH grading on admission was the second most significant factor for delayed mortality, patients who survived in the acute phase had a survival probability similar to those in a normal control group. 相似文献
104.
Keisuke Matsuda Satoru Takahashi Kiyoshi Takamasu 《International Journal of Precision Engineering and Manufacturing》2010,11(6):811-815
Recently, microfabrication technology has been used to develop micro-electro-mechanical systems (MEMSs), micro-total analysis
systems (μ-TASs), and photonic crystals. Various microfabrication techniques have been proposed; however, a technique that
can be used to efficiently fabricate 3-D structures via a simple procedure has not been reported thus far. Because 3-D metal
structures have not only mechanical functions but also electromagnetic functions, it is desirable to develop such a technique.
Our research group is in the process of developing a new technique for 3-D microfabrication that involves the use of a lower
power continuous wave laser. Our technique is characterized by the reduction of silver ions via the photocatalysis of titanium
dioxide (TiO2) excited at the laser beam waist. For the analysis and development of our microfabrication technique, we developed
a microscope system that enabled us to observe the microfabrication process along the fabrication beam optical axis and its
radial direction. We successfully visualized the microfabrication process in 3-D. The visualization showed that when the beam
waist was swept, the silver structure grew in 3-D following its path. The effect of the substrate on the deposition condition
was examined. 相似文献
105.
Satoru Miyazaki Hisashi Goshima Takaaki Amano Hiroyuki Shinkai Masafumi Yashima Takayuki Wakimoto Masaru Ishii 《Electrical Engineering in Japan》2012,180(2):24-32
In evaluating the uncertainty of the standard measuring system for lightning‐impulse high voltages, which is composed of a standard voltage divider, a digital recorder, and calibrators, step‐response tests of the standard voltage divider may be useful. In this paper, a convolution algorithm is employed to calculate the output impulse voltage waveforms from measured step‐response waveforms. The uncertainties of peak‐value measurement due to the influence of the nominal epoch, uncertainty of the peak‐value measurement due to dispersion of the AC scale factor, and uncertainty of the virtual front‐time measurement due to long‐term stability are evaluated. Furthermore, the error of the virtual front time of the output waveforms is discussed. The front part of the step‐response waveform, t≤ T30%, does not influence the error of the virtual front time. Therefore, for the standard voltage divider, the step‐response parameters, that is, the experimental response time, partial response time, settling time, and overshoot, have almost nothing to do with the error of the virtual front time. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 180(2): 24–32, 2012; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21279 相似文献
106.
Hirayama H Sawai K Moriyasu S Hirayama M Goto Y Kaneko E Miyamoto A Ushizawa K Takahashi T Minamihashi A 《Reproduction (Cambridge, England)》2008,136(5):639-647
We conducted this study to elucidate a factor causing a poor sign of parturition and prolonged gestation, which is frequently observed in cows carrying somatic clone fetuses. Pre-partum rises in concentrations of plasma estrone and estradiol-17beta in the recipient cows pregnant with clones were subtle. By contrast, the plasma concentration of estrone sulfate in clone pregnancies increased gradually from pre-initiation of parturition induction whereas control cows that received in vivo-derived embryos showed a significant increase at parturition. Therefore, in clone pregnancies, the ratio of estrone/estrone sulfate was low during the pre-partum period compared with control. Messenger RNA expression of estrogen sulfotransferase (SULT1E1) in the placenta at parturition was significantly higher in clone pregnancies than control pregnancies and was localized in binucleate cells (BNC). SULT1E1 mRNA abundance was negatively and positively correlated with concentrations of maternal estrone and estrone sulfate at parturition respectively. Messenger RNA expressions of estrogen sulfatase (STS) and aromatase (CYP19) were similar between clone and control pregnancies and were localized in BNC and caruncular epithelial cells. STS and CYP19 mRNA abundances showed positive correlations with maternal estradiol-17beta concentration. The population of BNC in the placenta did not differ between clone and control pregnancies. Plasma cortisol concentration of vaginally delivered newborn clone calves was comparable with those of control, although cesarean section delivered clone calves showed a low concentration. These results suggest that excess estrogen sulfoconjugation is the reason for the perturbed low ratio of active to inactive estrogens and the resulting hormonal imbalance contributes to the lack of overt signs of readiness for parturition in cows pregnant with clones. 相似文献
107.
108.
Si-doped β-Ga2O3 was generally activated by high-temperature annealing (over 600?°C) due to its strong bonding energy. Considering the electronic applications using β-Ga2O3 such as various power devices with low power consumption, it is strongly required to decrease the device process temperature including the impurity activation process. In this article, in order to decrease the impurity activation process temperature, we proposed the rapid thermal annealing (RTA) treatment to activate the Si atoms in the β-Ga2O3 films since RTA treatment can give the high thermal energy to specimen in a short time and investigated the influence of RTA treatment with various temperatures on conductivity activation energy, and structural properties of Si-doped β-Ga2O3 film. Si-doped β-Ga2O3 films were hetero-epitaxially grown on c-plane sapphire substrate by pulsed laser deposition method. Crystallinity, surface roughness, and electrical properties of specimens were investigated by changing the RTA temperatures. Crystallinity and surface roughness of Si-doped β-Ga2O3 films were not significantly influenced by RTA treatment at temperatures range of 100–700?°C. Conductivity activation energy of specimens with RTA treatment was about 50–100?meV and did not depend on RTA temperatures. As a result, even Si-doped β-Ga2O3 film with RTA treatment at 100?°C showed a relatively good conductivity. Based on the experimental results in this study, it can be said that RTA treatment is useful method to decrease the temperature of activation process for Si-doped β-Ga2O3 thin films without serious structural degradations. 相似文献
109.
Phytoextraction by a high-Cd-accumulating rice: reduction of Cd content of soybean seeds 总被引:1,自引:0,他引:1
Murakami M Ae N Ishikawa S Ibaraki T Ito M 《Environmental science & technology》2008,42(16):6167-6172
Soybeans (Glycine max (L) Merr.) are the major summer crop grown in Japanese upland fields (characterized by aerobic soil) that have been converted from paddies. To evaluate the effect of phytoextraction by rice on the seed cadmium (Cd) content of soybeans grown subsequently, we grew Milyang 23, a high-Cd-accumulating rice cultivar, and then grew soybeans in three paddy soils contaminated with moderate Cd concentrations (2.50-4.27 mg Cd kg(-1)). The rice accumulated 7-14% of the total soil Cd in its shoots. The soybean seed Cd contents were 24-46% less than those grown on control soils. Phytoextraction by Milyang 23 rice is thus a promising remediation method for reducing seed Cd contents of soybeans grown on paddy soils under aerobic soil conditions. 相似文献
110.
Iwao Matsuya Ryota Tomishi Maya Sato Kiyoshi Kanekawa Yoshihiro Nitta Motoichi Takahashi Satoru Miura Yasutsugu Suzuki Tomohiko Hatada Ryuta Katamura Takashi Tanii Shuichi Shoji Akira Nishitani Iwao Ohdomari 《IEEJ Transactions on Electrical and Electronic Engineering》2011,6(3):266-272
We have developed a novel sensor that enables us to measure the relative story displacement of a building structure in real time. This lateral displacement sensor (LDS) is composed of a light‐emitting diode (LED) array, which is fixed on the ceiling, and a position‐sensitive detector (PSD) unit, which is placed on the floor. We optimized the LDS to achieve high accuracy in lateral displacement measurement. The accuracy was evaluated to be 60 µm by conducting shaking table tests. Two LDSs were implemented in an actual building equipped with an active variable stiffness (AVS) system, and the building was vibrated with seismic waveforms by an exciter placed on the rooftop. The seismic displacement of the second floor relative to the first floor was measured using the LDS. Furthermore, the inclination angle of the second floor could be measured using the LDS during the seismic vibration. Using the AVS system, we realized the residual displacement of the second floor without inducing damage to the building, and succeeded in real‐time residual displacement measurement for the first time. These results indicate that the LDS is useful for the health diagnosis of a building structure. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献