全文获取类型
收费全文 | 410篇 |
免费 | 25篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 13篇 |
化学工业 | 92篇 |
金属工艺 | 33篇 |
机械仪表 | 15篇 |
建筑科学 | 2篇 |
能源动力 | 8篇 |
轻工业 | 15篇 |
水利工程 | 1篇 |
无线电 | 32篇 |
一般工业技术 | 115篇 |
冶金工业 | 43篇 |
原子能技术 | 14篇 |
自动化技术 | 55篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2022年 | 8篇 |
2021年 | 8篇 |
2020年 | 5篇 |
2019年 | 9篇 |
2018年 | 12篇 |
2017年 | 11篇 |
2016年 | 6篇 |
2015年 | 5篇 |
2014年 | 17篇 |
2013年 | 30篇 |
2012年 | 28篇 |
2011年 | 32篇 |
2010年 | 22篇 |
2009年 | 15篇 |
2008年 | 22篇 |
2007年 | 21篇 |
2006年 | 19篇 |
2005年 | 17篇 |
2004年 | 11篇 |
2003年 | 11篇 |
2002年 | 9篇 |
2001年 | 11篇 |
2000年 | 9篇 |
1999年 | 11篇 |
1998年 | 7篇 |
1997年 | 10篇 |
1996年 | 14篇 |
1995年 | 9篇 |
1994年 | 7篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1975年 | 2篇 |
1965年 | 1篇 |
排序方式: 共有438条查询结果,搜索用时 15 毫秒
51.
The effect of radio-frequency (RF) or low-frequency (LF) bias voltage on the for- mation of amorphous hydrogenated carbon (a-C:H) films was studied on silicon substrates with a low methane (CH4) concentration (2-10 vol.%) in CH4+Ar mixtures. The bias substrate was applied either by RF (13.56 MHz) or by LF (150 kHz) power supply. The highest hardness values (~18-22 GPa) with lower hydrogen content in the fihns (~20 at.%) deposited at 10 vol.% CH4, was achieved by using the RF bias, However, the films deposited using the LF bias, under similar RF plasma generation power and CH4 concentration (50 W and 10 vol.%, respectively), displayed lower hardness (~6-12 GPa) with high hydrogen content (~40 at.%). The structures analyzed by Fourier Transform Infrared (FTIR) and Raman scattering measurements provide an indication of trans-polyacetylene structure formation. However, its excessive formation in the films deposited by the LF bias method is consistent with its higher bonded hydrogen concentration and low level of hardness, as compared to the film prepared by the RF bias method. It was found that the effect of RF bias on the film structure and properties is stronger than the effect of the low-frequency (LF) bias under identical radio-frequency (RF) powered electrode and identical PECVD (plasma enhanced chemical vapor deposition) system configuration. 相似文献
52.
Nishiura M Nagasaka T Fujioka K Fujimoto Y Tanaka T Ido T Yamamoto S Kashiwa S Sasao M 《The Review of scientific instruments》2010,81(10):10D313
We developed a lost alpha detection system to use in burning plasma experiments. The scintillators of Ag:ZnS and polycrystalline Ce:YAG were designed for a high-temperature environment, and the optical transmission line was designed to transmit from the scintillator to the port plug. The required optical components of lenses and mirrors were irradiated using the fission reactor with the initial result that there was no clear change after the irradiation with a neutron flux of 9.6×10(17)?nm(-2) s(-1) for 48 h. We propose a diagnostic of alpha particle loss, so-called alpha particle induced gamma ray spectroscopy. The initial laboratory test has been carried out by the use of the Ce doped Lu(2)SiO(5) scintillator detector and an Am-Be source to detect the 4.44 MeV high energy gamma ray due to the (9)Be(α,nγ)(12)C reaction. 相似文献
53.
Shimizu A Ido T Nakamura S Toi K Nishiura M Kato S 《The Review of scientific instruments》2010,81(10):10E138
The heavy ion beam probe system in the Large Helical Device (LHD) was improved as follows. At first, the additional new sweeper was installed into the diagnostic port to extend the observable region. By using this sweeper, the potential profile was measured in a wider minor radius range than in previous experiments, in the case of outward shifted magnetic configuration of LHD. Next, the real time control system was installed to control the probe beam orbit for measuring the potential in plasma with large plasma current. In this system, a digital signal processor was used to control the probe beam in real time. The system worked well in the fixed position observation mode. In the sweeping mode for profile measurement, this control system became unstable. The details of this system and the experimental results are reported in this article. 相似文献
54.
Satria Zulkarnaen Bisri Taishi Takenobu Yohei Yomogida Hidekazu Shimotani Takeshi Yamao Shu Hotta Yoshihiro Iwasa 《Advanced functional materials》2009,19(11):1728-1735
A high‐performance ambipolar light‐emitting transistor (LET) that has high hole and electron mobilities and excellent luminescence characteristics is described. By using this device, a conspicuous light‐confined edge emission and current‐density‐dependent spectral evolution are observed. These findings will result in broader utilization of device potential and they provide a promising route for realizing electrically driven organic lasers. 相似文献
55.
Yoshikazu Kobayashi Hikari Hamada Yasuhiro Yamaguchi Hidekazu Ikezaki Kiyoshi Toko 《IEEJ Transactions on Electrical and Electronic Engineering》2009,4(6):710-719
This paper reports the development of membrane sensors based on an artificial lipid and plasticizers with high selectivity and sensitivity to drug bitterness by using bis(1-butylpentyl) adipate (BBPA), bis(2-ethylhexyl) sebacate (BEHS), phosphoric acid tris(2-ethylhexyl) ester (PTEH), and tributyl o-acetylcitrate (TBAC) as a plasticizer and phosphoric acid di-n-decyl ester (PADE) as an artificial lipid to optimize surface hydrophobicity of the sensors. In addition, a sensor with highly correlated bitterness sensory score was developed by blending BBPA and TBAC to detect the bitterness suppression effect of sucrose, and other bitter-masking materials. Therefore, this sensor can be used to evaluate the bitterness of various drug formulations with high accuracy. Copyright © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
56.
Masaya Yoshikawa Hidekazu Terai 《IEEJ Transactions on Electrical and Electronic Engineering》2011,6(3):221-228
Ant colony optimization (ACO) is based on the behavior of food gathering of ants and it is a powerful search tool particularly when applying it to combinatorial optimization problems. However, ACO has the inherent problem of substantial processing time, because it requires a lot of repetitive calculations. In this article, we propose novel hardware‐oriented ACO (H‐ACO) to reduce processing time. H‐ACO adopts new integer arithmetic instead of conventional floating point arithmetic in the optimization process and it achieves high‐speed processing while keeping the quality of solutions. In addition, H‐ACO reduces the hardware resources, accelerates the clock frequency, and improves the latency, if it is implemented as a dedicated hardware. Furthermore, we also propose a new route guidance algorithm which combines H‐ACO with Dijkstra's algorithm and it can be applied to a dynamic route guidance problem. Experiments using actual map data demonstrate the validity of the proposed route guidance algorithm. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
57.
Akihiro Nishiguchi Fumisato Sasaki Hidehito Maeda Masayuki Kabayama Akio Ido Tetsushi Taguchi 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(35)
Endoscopic submucosal dissection (ESD) provides strong therapeutic benefits for early gastrointestinal cancer as a minimally invasive treatment. However, there is currently no reliable treatment to prevent scar contracture resulting from ESD which may lead to cicatricial stricture. Herein, a multifunctional colloidal wound dressing to promote tissue regeneration after ESD is demonstrated. This sprayable wound dressing, composed of hydrophobized microparticles, exhibits the multifunctionality necessary for wound healing including tissue adhesiveness, blood coagulation, re‐epithelialization, angiogenesis, and controlled inflammation based on hydrophobic interaction with biological systems. An in vivo feasibility study using swine gastric ESD models reveals that this colloidal wound dressing suppresses fibrosis and accelerates wound healing. Multifunctional colloidal and sprayable wound dressings have an enormous therapeutic potential for use in a wide range of biomedical applications including accelerated wound healing after ESD, prevention of perforation, and the treatment of inflammatory diseases. 相似文献
58.
Nicola Manca Luca Pellegrino Teruo Kanki Warner J. Venstra Giordano Mattoni Yoshiyuki Higuchi Hidekazu Tanaka Andrea D. Caviglia Daniele Marré 《Advanced materials (Deerfield Beach, Fla.)》2017,29(35)
Relaxation oscillators consist of periodic variations of a physical quantity triggered by a static excitation. They are a typical consequence of nonlinear dynamics and can be observed in a variety of systems. VO2 is a correlated oxide with a solid‐state phase transition above room temperature, where both electrical resistance and lattice parameters undergo a drastic change in a narrow temperature range. This strong nonlinear response allows to realize spontaneous electrical oscillations in the megahertz range under a DC voltage bias. These electrical oscillations are employed to set into mechanical resonance a microstructure without the need of any active electronics, with small power consumption and with the possibility to selectively excite specific flexural modes by tuning the value of the DC electrical bias in a range of few hundreds of millivolts. This actuation method is robust and flexible and can be implemented in a variety of autonomous DC‐powered devices. 相似文献
59.
Weiwei Qiu Hidekazu Tanaka Feng Gao Qingxiang Wang Mingqiang Huang 《Advanced Powder Technology》2019,30(10):2083-2093
Porous nanododecahedron of Co3O4/C has been synthesized by calcination of the ZIF-67 in air at 400 °C and then be used as electrode material for fabricating a highly sensitive and low overpotential sensor of nitrite ion (NO2?). The structure and morphology characterization show that ZIF-67 behaves as an ideal sacrificial template for preparing Co3O4/C with regular shape. The two components of Co3O4 and carbon are uniformly distributed in the composite. Electrochemical analysis shows that the excellent electrocatalysis performance toward the oxidation of NO2? is based on the synergy of Co3O4 and carbon in the nanocomposite. At NO2? concentration from 2 nM to 8 mM, a fast response time within 3 s is revealed and 1.21 nM of detection limit is achieved. The sensor is also reliable to analysis of NO2? existed in the real samples of soil leaching liquid and macrophage supernate. 相似文献
60.
Yuya Ishii Yoshio Kobayashi Ken-ichi Watanabe Hidekazu Koda Hiroshi Kunigami Hideki Kunigami 《Advanced Powder Technology》2019,30(4):829-834
An electroless metal plating method was used to form Pt shells on sub-micrometer-sized silica (SiO2) particles fabricated by a sol-gel method. The electroless metal plating method was comprised of three steps: (1) surface-modification of SiO2 particles with polyvinylpyrrolidone (PVP) (SiO2/PVP) or poly-diallyldimethylammonium chloride (PDADMAC) (SiO2/PDADMAC), (2) pre-deposition of Pt nuclei or Pt fine particles on the SiO2 particles by reducing Pt ions in the presence of SiO2/PVP particles (SiO2/PVP-Pt) or SiO2/PDADMAC particles (SiO2/PDADMAC-Pt), and (3) growth of the pre-deposited Pt by immersing the SiO2/PVP-Pt or SiO2/PDADMAC-Pt particles in a Pt-plating solution. The pre-deposition of Pt nanoparticles was successfully performed for the surface-modified SiO2 particles since the surface modification possibly strengthened the affinity between the SiO2 particle surfaces and Pt ions. The Pt nanoparticles were pre-deposited more uniformly in the case of PVP because the pre-deposition took place more slowly for the PVP, which provided uniform surface-modification followed by the uniform pre-deposition of Pt nanoparticles. The formation of Pt shells was successfully performed on the SiO2/PVP-Pt particles in the electroless metal plating process because Pt nuclei were generated by the reduction of H2PtCl6 and then further deposited on the Pt particle surfaces on the SiO2/PVP-Pt particles. 相似文献