全文获取类型
收费全文 | 1705篇 |
免费 | 27篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 49篇 |
综合类 | 1篇 |
化学工业 | 234篇 |
金属工艺 | 60篇 |
机械仪表 | 55篇 |
建筑科学 | 38篇 |
能源动力 | 38篇 |
轻工业 | 82篇 |
水利工程 | 13篇 |
无线电 | 226篇 |
一般工业技术 | 307篇 |
冶金工业 | 524篇 |
原子能技术 | 47篇 |
自动化技术 | 63篇 |
出版年
2021年 | 12篇 |
2020年 | 7篇 |
2019年 | 16篇 |
2018年 | 26篇 |
2017年 | 21篇 |
2016年 | 27篇 |
2015年 | 14篇 |
2014年 | 19篇 |
2013年 | 54篇 |
2012年 | 48篇 |
2011年 | 62篇 |
2010年 | 51篇 |
2009年 | 52篇 |
2008年 | 57篇 |
2007年 | 72篇 |
2006年 | 46篇 |
2005年 | 38篇 |
2004年 | 38篇 |
2003年 | 40篇 |
2002年 | 46篇 |
2001年 | 33篇 |
2000年 | 26篇 |
1999年 | 37篇 |
1998年 | 203篇 |
1997年 | 129篇 |
1996年 | 84篇 |
1995年 | 52篇 |
1994年 | 44篇 |
1993年 | 54篇 |
1992年 | 19篇 |
1991年 | 30篇 |
1990年 | 11篇 |
1989年 | 20篇 |
1988年 | 21篇 |
1987年 | 14篇 |
1986年 | 15篇 |
1985年 | 27篇 |
1984年 | 22篇 |
1983年 | 15篇 |
1982年 | 24篇 |
1981年 | 16篇 |
1980年 | 15篇 |
1979年 | 5篇 |
1978年 | 12篇 |
1977年 | 7篇 |
1976年 | 19篇 |
1975年 | 5篇 |
1974年 | 6篇 |
1973年 | 5篇 |
1972年 | 6篇 |
排序方式: 共有1737条查询结果,搜索用时 15 毫秒
1.
Ooki Kurihara Takashi Tsuchida Genki Takahashi Gyeong-o Kang Hiroki Murakami 《Soils and Foundations》2018,58(5):1173-1186
Great amounts of soil and waste contaminated with radioactive cesium have been generated due to the decontamination work after the Fukushima Daiichi Nuclear Power Plant accident. The aim of this study is to develop a sealing geomaterial for use at the disposal facilities of the soil and waste constructed in the maritime environment. The geomaterial consists of marine clay, bentonite, and zeolite. The hydraulic conductivity and cesium-adsorption performance of the geomaterial were examined through laboratory tests with different proportions of bentonite and zeolite added to marine clay. It was concluded that the hydraulic conductivity could be reduced to the required level by increasing the amount of bentonite and that the cesium-adsorption capacity could be enhanced by increasing the amount of zeolite. 相似文献
2.
3.
Jia Sun Ming Zhang Zhi-Feng Wang Hai-Yan Chen Ye Chen Naoya Murakami Teruhisa Ohno 《稀有金属(英文版)》2019,(4)
Anatase titanium(Ⅳ) oxide(TiO_2) particles with exposed {001} and {101} facets were prepared by hydrothermal treatment of amorphous TiO_2 with H_2O_2-NH_3 solution. Crystal phase, shape, and size of TiO_2 particles are found to be greatly dependent on the ratio of H_2O_2-NH_3 solution. The prepared TiO_2 particles with specific exposed crystal faces show higher photocatalytic activity for acetaldehyde decomposition than commercial spherical TiO_2 particles. This result implies that recombination is prevented by spatial separation of redox sites in the particles because of selective migration of electrons and positive holes to specific exposed crystal faces and/or different reactivity of electrons and positive holes on the specific exposed crystal face. 相似文献
4.
Dr. Takuya Kobayakawa Kento Ebihara Yuzuna Honda Dr. Masayuki Fujino Dr. Wataru Nomura Prof. Naoki Yamamoto Dr. Tsutomu Murakami Prof. Hirokazu Tamamura 《Chembiochem : a European journal of chemical biology》2019,20(16):2101-2108
C34, a 34-mer fragment peptide, is contained in the HIV-1 envelope protein gp41. A dimeric derivative of C34 linked through a disulfide bridge at its C terminus was synthesized and found to display potent anti-HIV activity, comparable with that of a previously reported PEGylated dimer of C34REG. The reduction in the size of the linker moiety for dimerization was thus successful, and this result might shed some light on the mechanism of the suppression of six-helix bundle formation by these C34 dimeric derivatives. Addition of a Gly-Cys(CH2CONH2)-Gly-Gly motif at the N-terminal position of a C34 monomeric derivative significantly increased the anti-HIV-1 activity. This moiety functions as a new pharmacophore, and this might provide a useful insight into the design of potent HIV-1 fusion inhibitors. 相似文献
5.
Liu Pin Odo Fumiha Murakami Tengen Kanemoto Toshiaki 《Journal of Mechanical Science and Technology》2019,33(7):3187-3192
Journal of Mechanical Science and Technology - The acoustic noise and flow condition of tandem propellers in a horizontal axis-type tidal stream power unit, which is composed of counter-rotating... 相似文献
6.
Wataru Umishio Toshiharu Ikaga Yoshihisa Fujino Shintaro Ando Tatsuhiko Kubo Yukie Nakajima Tanji Hoshi Masaru Suzuki Kazuomi Kario Takesumi Yoshimura Hiroshi Yoshino Shuzo Murakami 《Indoor air》2020,30(6):1317-1328
The WHO Housing and health guidelines recommend a minimum indoor temperature of 18°C to prevent cold-related diseases. In Japan, indoor temperatures appear lower than in Euro-American countries because of low insulation standards and use of partial intermittent heating. This study investigated the actual status of indoor temperatures in Japan and the common characteristics of residents who live in cold homes. We conducted a nationwide real-world survey on indoor temperature for 2 weeks in winter. Cross-sectional analyses involving 2190 houses showed that average living room, changing room, and bedroom temperatures were 16.8°C, 13.0°C, and 12.8°C, respectively. Comparison of average living room temperature between prefectures revealed a maximum difference of 6.7°C (Hokkaido: 19.8°C, Kagawa: 13.1°C). Compared to the high-income group, the odds ratio for living room temperature falling below 18°C was 1.38 (95% CI: 1.04-1.84) and 2.07 (95% CI: 1.28-3.33) for the middle- and low-income groups. The odds ratio was 1.96 (95% CI: 1.19-3.22) for single-person households, compared to households living with housemates. Furthermore, lower room temperature was correlated with local heating device use and a larger amount of clothes. These results will be useful in the development of prevention strategies for residents who live in cold homes. 相似文献
7.
A numerical method to achieve the simultaneous computation of the seepage flows in porous media and the Navier-Stokes flows in the domain occupied purely by a fluid is presented in this paper. The method uses the Darcy-Brinkman equations with the continuous modelling of the interfacial flow velocity, and applies the finite volume method to the spatial discretization and the fractional step method to the numerical simulation of the incompressible fluid. The coupling of the two different flows is realized by the relevant interpolation of the pressure and the flow velocity onto the interface at which permeability and porosity are discontinuous. The interpolation schemes provide simple solutions to overcome the computational instability caused by the discontinuous change in permeability and to avoid having to resolve the considerably thin transition zone near the interface. Numerical analyses of the one-dimensional uniform flow, the lid-driven cavity flow, and the pipe-flow in a porous medium have been carried out. The results have shown that the proposed schemes enable a stable computation and fulfill the accurate and physically realistic numerical solutions. 相似文献
8.
Shigeru Murakami 《Molecular nutrition & food research》2015,59(7):1353-1363
Taurine is a sulfur‐containing amino acid that is present in mammalian tissues in millimolar concentrations. Taurine is involved in a diverse array of biological and physiological functions, including bile salt conjugation, osmoregulation, membrane stabilization, calcium modulation, anti‐oxidation, and immunomodulation. The prevalence of obesity and being overweight continues to rise worldwide at an alarming rate. Obesity is associated with a higher risk of metabolic and cardiovascular diseases, cancer, and other clinical conditions. Ingestion of taurine has been shown to alleviate metabolic diseases such as hyperlipidemia, diabetes, hypertension, and obesity in animal models. A global epidemiological survey showed that 24‐h urinary taurine excretion, as a marker of dietary taurine intake, was inversely associated with BMI, blood pressure, and plasma cholesterol in humans. In addition, taurine chloramine, an endogenous product derived from activated neutrophils, has been reported to suppress obesity‐induced oxidative stress and inflammation in adipocytes. Synthetic activity and concentration of taurine in adipose tissues and plasma have been shown to decrease in humans and animals during the development of obesity, suggesting a relationship between taurine deficiency and obesity. In this review, I summarize the effects of taurine on the progression of obesity in animal models and humans. Furthermore, I discuss possible mechanisms underlying the antiobesity effects of taurine. 相似文献
9.
10.
Babloo Chaudhary Hemanta Hazarika Akira Murakami Kazunori Fujisawa 《Geotextiles and Geomembranes》2018,46(5):597-610
Earthquake and tsunami impose great threats on the stability of a breakwater. Foundation of the breakwater is weakened by these forces, and it may result in collapse of the breakwater. Lateral flow of seabed soils take place beneath the breakwater, and excess pore water pressure is generated in the foundation by an earthquake that precedes tsunami. These factors may lead to excessive settlement and horizontal displacement of the breakwater. Tsunami introduces additional instability to the deformed breakwater. Due to water level difference between seaside and harborside of the breakwater during a tsunami, seepage occurs through its foundation, and it may cause pipping of seabed soils. Tsunami induced scouring of mound is also a big problem for the stability of the breakwater foundation. Finally, these result in failure of the breakwater foundation. Due to failure of its foundation, the breakwater may collapse and cannot block the tsunami. It results in entering of the tsunami in coastal areas. In order to make a breakwater resilient against earthquake and tsunami induced damage, reinforcing countermeasures were developed for foundation of a breakwater. Geogrid, gabions and sheet piles were used for reinforcing a foundation model. The effectiveness of the model is evaluated through physical modeling for mitigating the earthquake and tsunami induced damage. Shaking table tests were performed to determine the effectiveness of the reinforced model under different earthquake loadings. Tsunami overflow test was conducted on the same deformed model in order to see the effects of tsunami on the model. Comparisons were made between the unreinforced and reinforced foundations, and it was observed during the tests that the reinforced foundation performed well in reducing the damage of the breakwater brought by the earthquake and tsunami. Overall, this study is useful for practice engineering, and the reinforced foundation model can be adopted for designing a breakwater foundation to reduce damage triggered by an earthquake and tsunami in the future. 相似文献