全文获取类型
收费全文 | 223篇 |
免费 | 5篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 12篇 |
化学工业 | 48篇 |
金属工艺 | 7篇 |
机械仪表 | 10篇 |
建筑科学 | 1篇 |
能源动力 | 16篇 |
轻工业 | 28篇 |
石油天然气 | 1篇 |
无线电 | 27篇 |
一般工业技术 | 45篇 |
冶金工业 | 18篇 |
原子能技术 | 1篇 |
自动化技术 | 15篇 |
出版年
2022年 | 2篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 3篇 |
2018年 | 3篇 |
2017年 | 5篇 |
2016年 | 4篇 |
2015年 | 5篇 |
2014年 | 11篇 |
2013年 | 10篇 |
2012年 | 8篇 |
2011年 | 15篇 |
2010年 | 13篇 |
2009年 | 6篇 |
2008年 | 7篇 |
2007年 | 11篇 |
2006年 | 14篇 |
2005年 | 12篇 |
2004年 | 5篇 |
2003年 | 8篇 |
2002年 | 6篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1994年 | 1篇 |
1993年 | 5篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 5篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1970年 | 1篇 |
排序方式: 共有229条查询结果,搜索用时 15 毫秒
1.
After recording transiently evoked otoacoustic emissions (TEOAEs) to a click stimulus in guinea pigs by using the IL088 which was developed by Bray and Kemp (1987) for easy recording and analysis of TEOAE, the changes after intravenous administration of furosemide (30 mg/kg or 50 mg/kg) were examined. The wave of the TEOAE could be detected from 20 of 24 ears (83%). After the i.v. injection of furosemide (30 mg/kg), TEOAE powers (total echo power and highest peak power in FFT pictures) decreased quickly and showed minimum values after 5-10 min. Then they increased rapidly and recovered normally within 60 min after injection. However, no ears showed TEOAEs during the 5- to 10-min period following the injection of the 50-mg/kg dose of furosemide. They then recovered slowly as compared with the group treated with the lower dose of furosemide (30 mg/kg). These changes are similar to those of the endocochlear potential (EP) after furosemide injection. These data support the notion that the EP can contribute to the mechanism of TEOAE generation. 相似文献
2.
K Maeda M Konishi K Mikasa T Majima K Ueda E Yoshimoto M Sakamoto K Hamada M Sawaki R Sano T Masutani N Narita 《Canadian Metallurgical Quarterly》1998,72(11):1171-1175
Neisseria species other than N. meningitidis and N. gonorrhoeae are generally regarded as commensal bacterial flora of the oropharynx, and little is known regarding cases of these non-pathogenic Neisseria species in the lower respiratory tract. We clinically examined respiratory tract infections from which non-pathogenic Neisseria species were isolated by transtracheal aspiration (TTA). The incidence of non-pathogenic Neisseria isolated was 54 (15.7%) out of 344 episodes of respiratory tract infections with isolated microorganisms from TTA, and was 17.6%, 15.8%, 14.3% for pneumonia, acute bronchitis, and chronic lower respiratory tract infection, respectively. All 54 episodes were isolated with other microorganisms such as alpha-Streptococcus spp. (75.9%), Haemophilus influenzae (25.9%) and anaerobics (22.2%). The isolation ratio according to the age group increased at 45 years of age or more, but did not increase with the advance of age. Predisposing factors were identified such as overt aspiration, iatrogenic procedure and heavy smoking. Cases without overt aspiration that had fevers of 38 degrees C or more or hypoxemia of less than PaO2 70 torr when detecting non-pathogenic Neisseria were observed more frequently in the aged than the non-aged. The findings suggest the detection of non-pathogenic Neisseria by TTA is influenced by the host state that the fall of microorganisms from the upper to lower respiratory tract cannot be defended or excluded by mucociliary transportation disorder due to underlying disease and smoking, or deterioration of physical status other than overt or silent aspiration. 相似文献
3.
Nobuhiko Yabu Kouhei Nagano Nozomu Izumi 《Journal of the Society for Information Display》2015,23(6):246-252
Using shorter wavelength for exposure light is one way to achieve high resolution while keeping sufficient depth of focus. We show exposure results for high resolution to confirm the effect of deep UV exposure light. With deep UV light, 1.2‐µm line and space pattern and 1.8‐µm contact hole pattern are resolved while keeping sufficient depth of focus. 相似文献
4.
Nobuhiko Hayashi Yusuke Kato Manfred Sigrist 《Journal of Low Temperature Physics》2005,139(1-2):79-96
The low-temperature shrinking of the vortex core (Kramer-Pesch effect) is studied for an isolated single vortex for chiral
p-wave and s-wave superconducting phases. The effect of nonmagnetic impurities on the vortex core radius is numerically investigated
in the Born limit by means of a quasiclassical approach. It is shown that in the chiral p-wave phase the Kramer-Pesch effect
displays a certain robustness against impurities owing to a specific quantum effect, while the s-wave phase reacts more sensitively
to impurity scattering. This suggests chiral p-wave superconductors as promising candidates for the experimental observation
of the Kramer-Pesch effect. 相似文献
5.
Nobuhiko Tamura Norimichi Tsumura Yoichi Miyake 《Journal of the Society for Information Display》2003,11(2):333-339
Abstract— A color management system (CMS) such as ICC profile or sRGB space have been proposed for color transformation and reproduction of cross media. In such a CMS, accurate colorimetric characterization of a display device plays a critical role in achieving device‐independent color reproduction. In the case of a CRT, colorimetric characterization based on a GOG model is accurate enough for this purpose. However, there is no effective counterpart in liquid‐crystal displays (LCDs) since the characterization of an LCD has many difficulties, such as channel interaction and non‐constancy of channel chromaticity. In this paper, a new method of display characterization is proposed which is applicable to the assessment of color reproduction of LCDs. The proposed method characterizes an electro‐optical transfer function considering both channel interaction and non‐constancy of channel chromaticity. Experimental results show that the proposed method is very effective in the colorimetry of LCDs. 相似文献
6.
Yosuke Inomata Jae-Won Oh Kohei Taniguchi Nobuhiko Sugito Nao Kawaguchi Fumitoshi Hirokawa Sang-Woong Lee Yukihiro Akao Shinji Takai Kwang-Pyo Kim Kazuhisa Uchiyama 《International journal of molecular sciences》2022,23(9)
Non-alcoholic steatohepatitis (NASH) has pathological characteristics similar to those of alcoholic hepatitis, despite the absence of a drinking history. The greatest threat associated with NASH is its progression to cirrhosis and hepatocellular carcinoma. The pathophysiology of NASH is not fully understood to date. In this study, we investigated the pathophysiology of NASH from the perspective of glycolysis and the Warburg effect, with a particular focus on microRNA regulation in liver-specific macrophages, also known as Kupffer cells. We established NASH rat and mouse models and evaluated various parameters including the liver-to-body weight ratio, blood indexes, and histopathology. A quantitative phosphoproteomic analysis of the NASH rat model livers revealed the activation of glycolysis. Western blotting and immunohistochemistry results indicated that the expression of pyruvate kinase muscle 2 (PKM2), a rate-limiting enzyme of glycolysis, was upregulated in the liver tissues of both NASH models. Moreover, increases in PKM2 and p-PKM2 were observed in the early phase of NASH. These observations were partially induced by the downregulation of microRNA122-5p (miR-122-5p) and occurred particularly in the Kupffer cells. Our results suggest that the activation of glycolysis in Kupffer cells during NASH was partially induced by the upregulation of PKM2 via miR-122-5p suppression. 相似文献
7.
Kate J. Norris Andrew J. Lohn Takehiro Onishi Elane Coleman Vernon Wong Ali Shakouri Gary S. Tompa Nobuhiko P. Kobayashi 《Journal of Electronic Materials》2012,41(5):971-976
We report the growth of erbium monoantimonide (ErSb) thin films on indium antimonide (100) substrates by low-pressure metalorganic
chemical vapor deposition. The growth rate of ErSb thin films shows strong dependency on the growth temperature and the Sb/Er
precursor molar flow rate ratio. Scanning electron microscopy, energy-dispersive x-ray spectroscopy, and x-ray diffractometry
(XRD) were employed to study the ErSb thin films grown under the growth conditions that gave the maximum growth rate in the
range we investigated. We also report the growth of two types of nanocomposites in which ErSb nanocolumns or nanoslabs with
lengths ~500 nm and diameters 20 nm to 30 nm are embedded in Zn-doped InGaSb (ErSb/InGaSb:Zn) and ErSb nanoparticles with
diameters of ~30 nm are embedded in Zn-doped InSbAs (ErSb/InSbAs:Zn). These nanocomposites were intended to increase phonon
scattering in a mid-to-long phonon wavelength range to reduce lattice thermal conductivity. We used time-domain thermoreflectance
to measure total thermal conductivity for the two types of nanocomposites, obtaining 4.0 ± 0.6 W/mK and 6.7 ± 0.8 W/mK for
the ErSb/InAsSb:Zn and ErSb/InGaSb:Zn nanocomposites, respectively, which suggests that the thermal conductivity was close
to or slightly smaller than the alloy limit of the two ternary alloy hosts. The two nanocomposites were further studied by
transmission electron microscopy (TEM) to reveal their microscopic features and by XRD to assess their crystalline structures. 相似文献
8.
9.
10.
A simple screening procedure for heterotrophic nitrifying bacteria with oxygen-tolerant denitrification activity 总被引:4,自引:0,他引:4
Matsuzaka E Nomura N Nakajima-Kambe T Okada N Nakahara T 《Journal of Bioscience and Bioengineering》2003,95(4):409-411
Various naturally occurring strains of heterotrophic nitrifying bacteria were isolated by enrichment culture using acetamide as the C and N source, and 21 strains were identified as heterotrophic nitrifiers. Using a new simple procedure, these 21 strains were also investigated for the ability to carry out denitrifcation in the presence of oxygen. Several of the nitrifying strains were found to exhibit a distinct activity that allows for denitrifcation via nitrite (NO2-) in the presence of oxygen, indicating that they have an oxygen-tolerant denitrifcation system. A wide variety of bacteria possessing both nitrification and denitrifcation capabilities in the presence of oxygen were isolated and partially characterized by using the simple screening combinatorial procedure described in this paper. 相似文献