全文获取类型
收费全文 | 252篇 |
免费 | 18篇 |
专业分类
电工技术 | 10篇 |
化学工业 | 77篇 |
金属工艺 | 8篇 |
机械仪表 | 4篇 |
建筑科学 | 8篇 |
能源动力 | 14篇 |
轻工业 | 23篇 |
水利工程 | 3篇 |
无线电 | 27篇 |
一般工业技术 | 48篇 |
冶金工业 | 16篇 |
原子能技术 | 7篇 |
自动化技术 | 25篇 |
出版年
2023年 | 2篇 |
2022年 | 8篇 |
2021年 | 13篇 |
2020年 | 2篇 |
2019年 | 12篇 |
2018年 | 15篇 |
2017年 | 12篇 |
2016年 | 17篇 |
2015年 | 9篇 |
2014年 | 9篇 |
2013年 | 16篇 |
2012年 | 16篇 |
2011年 | 20篇 |
2010年 | 16篇 |
2009年 | 21篇 |
2008年 | 19篇 |
2007年 | 9篇 |
2006年 | 8篇 |
2005年 | 10篇 |
2004年 | 3篇 |
2002年 | 4篇 |
2001年 | 3篇 |
1999年 | 4篇 |
1998年 | 5篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1990年 | 3篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有270条查询结果,搜索用时 390 毫秒
21.
Cooking up an interactive olfactory game display. 总被引:2,自引:0,他引:2
Takamichi Nakamoto Shigeki Otaguro Masashi Kinoshita Masahiko Nagahama Keita Ohinishi Taro Ishida 《Computer Graphics and Applications, IEEE》2008,28(1):75-78
It's long been possible to give users outside an actual environment that environment's visual and auditory information and thus contribute to establishing presence. However, we've yet to establish much presence when users require olfactory information - such as in environments focused on foods, flowers, perfumes, or, in some cases, more offensive smells. Recently, several VR researchers have become interested in olfaction and olfactory displays that present smells in virtual environments (VEs). In this article, we describe our interactive olfactory display. One of our development goals is to confirm the assumption that users' interactions with the system increases presence. Thus, we used our interactive olfactory display to develop a cooking game in collaboration with electronic engineers and artists. 相似文献
22.
Hiromi Yamashita Yo Fujii Yuichi Ichihashi Shu Gou Zhang Keita Ikeue Dal Ryung Park Keiko Koyano Takashi Tatsumi Masakazu Anpo 《Catalysis Today》1998,45(1-4):221-227
Highly dispersed titanium oxide catalysts have been prepared within zeolite cavities as well as in the zeolite framework and utilized as photocatalysts for the reduction of CO2 with H2O to produce CH4 and CH3OH at 328 K. In situ photoluminescence, ESR, diffuse reflectance absorption and XAFS investigations indicate that the titanium oxide species are highly dispersed within the zeolite cavities and framework and exist in tetrahedral coordination. The charge transfer excited state of the highly dispersed titanium oxide species play a significant role in the reduction of CO2 with H2O with a high selectivity for the formation of CH3OH, while the catalysts involving the aggregated octahedrally coordinated titanium oxide species show a high selectivity to produce CH4, being similar to reactions on the powdered TiO2 catalysts. Ti-mesoporous molecular sieves exhibit high photocatalytic reactivity for the formation of CH3OH, its reactivity being much higher than the powdered TiO2 catalysts. The addition of Pt onto the highly dispersed titanium oxide catalysts promotes the charge separation which leads to an increase in the formation of CH4 in place of CH3OH formation. 相似文献
23.
Yuichi Ichihashi Yo-hei Kamizaki Naoya Terai Keita Taniya Shigeru Tsuruya Satoru Nishiyama 《Catalysis Letters》2010,134(3-4):324-329
The gas-phase catalytic oxidation of benzene over copper supported on HZSM-5 added with titanium (Cu/Ti/HZSM-5) was carried out by using molecular oxygen as an oxidant. Phenol was effectively produced by the titanium addition to Cu/HZSM-5. The titanium addition to Cu/HZSM-5 induces the easy reduction of Cu2+ species to Cu+ species in the catalysts, and the produced Cu+ species seems to produce the phenol effectively. 相似文献
24.
Ahmed J. Samed Takayuki Tanaka Keita Ikeue Masato Machida 《Topics in Catalysis》2010,53(7-10):591-596
Catalytic NO–H2–CO–O2 reaction was studied over Pt-supported Ln-incorporated FSM-16 (Ln = La, Ce and Pr). Pr-FSM-16 exhibited the highest activity for NO x reduction at ≤200 °C. Pr has an effect of increasing the basicity to promote the oxidative adsorption of NO, which is a key for efficient de-NO x . 相似文献
25.
The superconductivity of the tight binding electrons in a magnetic field is studied. We can treat both cases of quasi-one-dimension and quasi-two-dimension in the same manner. We study a various kind of anisotropic superconductivity with line nodes of the energy gap by taking attractive interaction between electrons in nearest sites along each axis. The magnetic field dependence of the transition temperature is calculated for a various pairing symmetry of superconductivity. When a magnetic field is applied in the conducting plane, the transition temperature is shown to increase as the magnetic field increases. In the strong magnetic field the eigenstates approach to those in the absence of hopping between planes, resulting in no orbital frustration. 相似文献
26.
Akira Otake Keita Yamaguchi Kenji Kobayashi Kenji Shiraishi 《Microelectronic Engineering》2009,86(7-9):1849-1851
We have investigated atomistic structural changes of two types of defects (N vacancies and O substitutional defects) in a SiN layer in MONOS type memories during program/erase actions. N vacancy type defects reveal reversible structural change, whereas O substitutional defects are expected to reveal irreversible structural changes, indicating that detailed atomistic structure is crucial for clarifying the characteristics of MONOS type memory operation. 相似文献
27.
Summary We study the formation of reversible gels induced by addition of borax in aqueous poly(vinylalcohol). Under suitable conditions, sol, gel or demixed phase is observed. We present a qualitative interpretation of the the number of inter-polymer complexes which is governed by the complexation equilibrium. 相似文献
28.
Yuji Hatano Keita IshiyamaHirofumi Homma Kuniaki Watanabe 《International Journal of Hydrogen Energy》2007
Niobium subcarbide (Nb2C) was chosen as a material for non-porous intermediate layer to improve the high temperature durability of Pd–Nb composite membranes for hydrogen separation. A layer of Nb2C was prepared between Nb substrate and thin Pd films (100 nm), and the stability of Pd coating at elevated temperatures (573–773 K) was examined by hydrogen absorption experiments. Hydrogen permeability through the Nb2C layer appeared to be sufficiently high, and no noticeable deterioration was observed in hydrogen absorption rate under as-prepared conditions. The degradation in coating effect of Pd at elevated temperatures was substantially mitigated by Nb2C layer. Such improved durability was ascribed to retardation of open porosity development by Nb2C caused as a consequence of impeded interdiffusion between Pd and Nb. 相似文献
29.
Repeated temperature modulation epitaxy for p-type doping and light-emitting diode based on ZnO. 总被引:27,自引:0,他引:27
Atsushi Tsukazaki Akira Ohtomo Takeyoshi Onuma Makoto Ohtani Takayuki Makino Masatomo Sumiya Keita Ohtani Shigefusa F Chichibu Syunrou Fuke Yusaburou Segawa Hideo Ohno Hideomi Koinuma Masashi Kawasaki 《Nature materials》2005,4(1):42-46
Since the successful demonstration of a blue light-emitting diode (LED), potential materials for making short-wavelength LEDs and diode lasers have been attracting increasing interest as the demands for display, illumination and information storage grow. Zinc oxide has substantial advantages including large exciton binding energy, as demonstrated by efficient excitonic lasing on optical excitation. Several groups have postulated the use of p-type ZnO doped with nitrogen, arsenic or phosphorus, and even p-n junctions. However, the choice of dopant and growth technique remains controversial and the reliability of p-type ZnO is still under debate. If ZnO is ever to produce long-lasting and robust devices, the quality of epitaxial layers has to be improved as has been the protocol in other compound semiconductors. Here we report high-quality undoped films with electron mobility exceeding that in the bulk. We have used a new technique to fabricate p-type ZnO reproducibly. Violet electroluminescence from homostructural p-i-n junctions is demonstrated at room-temperature. 相似文献
30.
Keita Yamaguchi Akira Otake Kenji Kobayashi Kenji Shiraishi 《Microelectronic Engineering》2009,86(7-9):1680-1682
We have investigated the effect of the oxygen incorporation into SiN films by the first principles calculations. The calculated results show that the oxygen incorporation tends to generate defect states in SiN band gap by forming dangling bonds and floating bonds of Si. Based on the calculated results, it is also indicated that the high quality SiON film can be fabricated by suppressing the incorporation of O atoms into the SiN film, reproducing the reported experiments. 相似文献