全文获取类型
收费全文 | 2841篇 |
免费 | 63篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 221篇 |
综合类 | 2篇 |
化学工业 | 542篇 |
金属工艺 | 105篇 |
机械仪表 | 62篇 |
建筑科学 | 46篇 |
矿业工程 | 3篇 |
能源动力 | 95篇 |
轻工业 | 201篇 |
水利工程 | 7篇 |
石油天然气 | 2篇 |
无线电 | 276篇 |
一般工业技术 | 515篇 |
冶金工业 | 532篇 |
原子能技术 | 72篇 |
自动化技术 | 227篇 |
出版年
2023年 | 17篇 |
2022年 | 36篇 |
2021年 | 63篇 |
2020年 | 27篇 |
2019年 | 31篇 |
2018年 | 39篇 |
2017年 | 35篇 |
2016年 | 63篇 |
2015年 | 43篇 |
2014年 | 79篇 |
2013年 | 128篇 |
2012年 | 96篇 |
2011年 | 137篇 |
2010年 | 105篇 |
2009年 | 96篇 |
2008年 | 112篇 |
2007年 | 135篇 |
2006年 | 104篇 |
2005年 | 90篇 |
2004年 | 79篇 |
2003年 | 65篇 |
2002年 | 85篇 |
2001年 | 64篇 |
2000年 | 47篇 |
1999年 | 76篇 |
1998年 | 232篇 |
1997年 | 136篇 |
1996年 | 95篇 |
1995年 | 70篇 |
1994年 | 62篇 |
1993年 | 57篇 |
1992年 | 37篇 |
1991年 | 22篇 |
1990年 | 29篇 |
1989年 | 22篇 |
1988年 | 22篇 |
1987年 | 27篇 |
1986年 | 31篇 |
1985年 | 24篇 |
1984年 | 25篇 |
1983年 | 22篇 |
1982年 | 27篇 |
1981年 | 11篇 |
1980年 | 17篇 |
1979年 | 6篇 |
1978年 | 13篇 |
1977年 | 13篇 |
1976年 | 29篇 |
1975年 | 7篇 |
1972年 | 6篇 |
排序方式: 共有2908条查询结果,搜索用时 15 毫秒
51.
A new and effective liquid membrane process to achieve both separation and enrichment simultaneously of weak organic acids or bases was developed. The process utilizes effectively the difference in the apparent partition coefficient of the constituent species between the aqueous and organic phases, and uses the change of the apparent partition coefficients with the hydrogen ion concentration of the aqueous phase. For such a fundamental model apparatus as a diaphragm diffusion cell being operated batch wise, the effects of pK value of solutes, permeability of solutes through the membrane, volume ratio of liquids in two aqueous phases, and pH value of aqueous phase on enrichment factor and selectivity for the solute to be concentrated were discussed analytically. Separation and enrichment were demonstrated using aqueous mixed solutions of fumaric acid and L-malic acid. The results were in good agreement with the theoretical predictions. 相似文献
52.
The strength, S , of ceramic and glass fibers often can be estimated from fractographic investigation using the fracture mirror radius, r m , and the relationship S = A m /( r m )1/2 , where A m is the "mirror constant." The present work estimates the value of A m for Tyranno® Si-Ti-C-O fibers in situ in a three-dimensional woven SiC/SiC-based composite to be 2.50 ± 0.09 MPa·m1/2 . This value is within the range of 2–2.51 MPa·m1/2 previously obtained for nominally similar Nicalon® Si-C-O fibers. 相似文献
53.
Masaru Takahashi Tetsu Nakatani Shinji Iwamoto Tsunenori Watanabe Masashi Inoue 《Applied catalysis. B, Environmental》2007,70(1-4):73-79
The solvothermal reaction of mixtures of aluminum isopropoxide (AIP) and gallium acetylacetonate (Ga(acac)3) directly yielded the mixed oxides of γ-Ga2O3-Al2O3. In the solvothermal synthesis, the crystal structure of mixed oxides was controlled by the initial formation of γ-Ga2O3 nuclei. The mixed oxides prepared in diethylenetriamine have extremely high activities for selective catalytic reduction (SCR) of NO with methane as a reducing agent. With increasing crystallite size of the spinel structure, the catalytic activity increased. The ratio of the amount of methane consumed by combustion to total methane conversion was proportional to the density of acid sites on the surface of the mixed oxides. The mixed oxide catalysts prepared in diethylenetriamine had lower densities of acid sites and showed a higher methane-efficiency for CH4-SCR than those prepared in other solvents. These catalysts maintained their high activity even when the reaction was carried out under the severe conditions (i.e., high space velocity and low NO concentration). 相似文献
54.
Summary Giant hybrid liposomes of polymerizable lipid and cholesterol were prepared by the hydration method and were polymerized by UV irradiation. The obtained giant liposomes were freeze-dried and washed with chloroform to skeletonize the frame structure of the polymerized membrane. The skeletonized liposomes were directly confirmed by scanning electron microscopy. The single-layered and fully spherical liposome frame were easily confirmed by the stereo-pair of the obtained micrographs. 相似文献
55.
A metric of the 3D image quality of autostereoscopic displays based on optical measurements is proposed. This metric uses each view's luminance contrast, which is defined as the ratio of maximum luminance at each viewing position to total luminance at that position. Conventional metrics of the autostereoscopic display based on crosstalk, which uses “wanted” and “unwanted” lights. However, in case of the multiple‐views‐type autostereoscopic displays, it is difficult to distinguish exactly which lights are wanted lights and which are unwanted lights. This paper assumes that the wanted light has a maximum luminance at the good stereoscopic viewing position, and the unwanted light also has a maximum luminance at the worst pseudo‐stereoscopic viewing position. By using the maximum luminance that is indexed by view number of the autostereoscopic display, the proposed method enables characterizing stereoscopic viewing conditions without using wanted/unwanted light. A 3D image quality metric called “stereo luminance contrast,” the average of both eyes' contrast, is proposed. The effectiveness of the proposed metric is confirmed by the results of optical measurement analyses of different types of autostereoscopic displays, such as the two‐view, scan‐backlight, multi‐view, and integral. 相似文献
56.
Tetsuto Kanzaki Yo Ishikawa Nobuhiro Morisaki Kohji Shirai Yasushi Saito Sho Yoshida 《Lipids》1987,22(10):704-710
Studies were done on changes in phospholipid content and fatty acid composition of phospholipids and on the role of the acylation
pathway in synthesis of phospholipids in the development of abnormal fatty acid composition in the glomeruli of rats 2 and
10 mo after induction of diabetes with streptozotocin. The proportions of individual phospholipids in the glomeruli of rats
were not changed 2 mo after induction of diabetes, but the proportion of phosphatidylethanolamine (PE) decreased and that
of sphingomyelin increased 10 mo after induction of diabetes. In contrast, in liver the proportion of PE was increased and
that of phosphatidylcholine was decreased. These results showed that changes of individual phospholipids in glomeruli were
time-dependent and tissue-specific. Two mo after induction of diabetes, the main change in the phospholipid fatty acid composition
of diabetic glomeruli was a decrease in arachidonic acid (AA); the main change in serum free fatty acids (FFA) was an increase
in linoleic acid (LA) and a decrease in AA. Ten mo after induction of diabetes, the main changes in the phospholipid fatty
acid composition of glomeruli were an increase in LA and a decrease in AA; the main change of the serum FFA composition was
a decrease in AA. Thus, the fatty acid composition of glomerular phospholipids was not directly correlated to that of the
serum in diabetic rats. Acyl-CoA synthetase and acyltransferase activities increased in diabetic glomeruli with either AA
or LA as substrate, but activity toward LA increased more at 2 mo after induction of diabetes. Acyl-CoA synthetase activity
increased in diabetic glomeruli with LA as substrate, but that did not change with AA as substrate at 10 mo after induction
of diabetes. Furthermore, acyltransferase activity decreased in diabetic glomeruli with AA as substrate, although that did
not change with LA as substrate at 10 mo after induction of diabetes. 相似文献
57.
Kazuhiko Kandori Naoto Horigami Akemi Yasukawa Tatsuo Ishikawa 《Journal of the American Ceramic Society》1997,80(5):1157-1164
The texture of fibrous calcium hydroxyapatite (Ca10 -(PO4 )6 (OH)2 , CaHAP) particles that were prepared by the decomposition of calcium–ethylenediaminetetraacetic acid (calcium–EDTA) chelates at 100°C under various pH conditions (pH values of 5–10) was investigated by various means. Well-crystallized fibrous CaHAPs were produced at pH .6. The stoichiometry of the CaHAPs with a chemical formula of Ca10− x (HPO4 ) x (PO4 )6− x (OH)2− x (H2 O) x was improved by increasing the decomposition pH. All the CaHAPs had unit-cell dimensions of a = 0.9436 ± 0.0003 nm and c = 0.6881 ± 0.0006 nm, exhibiting an enlarged a value. The finding of mesoporosity of CaHAPs by nitrogen gas (N2 ) adsorption measurement indicated that the CaHAPs were produced by an agglomeration of primary particles. Furthermore, the nonstoichiometric CaHAPs that formed at pH 6 developed ultramicropores, which were accessible to water (H2 O) molecules but not to N2 molecules, by the elimination of H2 O molecules that were adsorbed in interstices of primary particles in less-orderly crystallized CaHAPs and/or by dehydration of HPO4 2− groups. These findings by gas adsorption techniques could give evidence for the agglomeration mechanism to attain a polycrystalline CaHAP, although they exhibited good crystallinity with large size. 相似文献
58.
Masaru Takahashi Noriyuki Inoue Tatsuya Takeguchi Shinji Iwamoto Masashi Inoue Tsunenori Watanabe 《Journal of the American Ceramic Society》2006,89(7):2158-2166
The reaction of mixtures of aluminum isopropoxide and gallium acetylacetonate in 1,4-butanediol or 1,5-pentanediol at high temperatures (glycothermal reaction) directly gave the γ-Ga2 O3 –Al2 O3 solid solutions, which had high catalytic activities for selective reduction of NO using methane as the reducing agent. However, the reaction with a higher Al/(Ga+Al) charged ratio yielded the glycol derivative of boehmite as a by-product and the catalytic activity of the solid solution decreased. Therefore, synthesis of the solid solution using various glycols was examined and it was found that solid solutions with high Al contents without contamination of the glycol derivative of boehmite were obtained by using 1,6-hexanediol as a reaction medium. The solid solution exhibited a higher NO conversion than that synthesized in other glycols. 相似文献
59.
Toshihiko Tanaka Norio Hasegawa Hiroshi Shiraishi Shinji Okazaki 《Polymer Engineering and Science》1992,32(20):1545-1549
The multiple interference effect is one of the major causes of the fluctuation in critical dimension control (CD) and in mark detection for alignment. Suppressing this effect is critical for future photolithography. We propose a new photolithography technique called anti reflective coating on resist (ARCOR), which improves linewidth accuracy and overlay accuracy by suppressing multiple interference. ARCOR consists of relatively simple processes: A clear antireflective film is spun onto the resist prior to the mark detecting for alignment and exposure. The film is subsequently removed and the resist developed in the conventional way. ARCOR differs from ARC, which suppresses the reflection at the resist/substrate interface. ARCOR suppresses the reflection at the air/resist interface. ARCOR allows mark detection and exposure without light intensity-loss and multiple interference. The experiments mainly examine polysiloxane and perfluoroalkylpolyether as ARCOR materials. It is shown that linewidth accuracy can be improved from 0.3 to 0.03 μm. The signal-to-noise ratio of the alignment signal is drastically improved, and the overlay error is about half that of the conventional method. ARCOR is also effective for directly measuring the reflectivity at the resist/substrate interface, which is a key parameter of the multiple interference effect and the halation. Using ARCOR and a thin resist film, the measured ratio of reflected light to incident light indicates the reflectivity at the resist/substrate interface. Because, the probe light does not reflect off the resist surface and the intensity-loss at the resist surface is suppressed. With perfluoroalkylpolyether film, the measurement error is ~ 1.5%. 相似文献
60.
Toshio Ogasawara Takashi Ishikawa Takashi Matsuzaki 《Journal of the American Ceramic Society》2003,86(5):830-837
The thermal response and oxidation of Tyranno™ Lox-M fiber-reinforced Si-Ti-C-O matrix composites in high-enthalpy dissociated air was investigated in an arc jet facility (an arc wind tunnel). The maximum surface temperature reached 1310–1670°C. Catalytic recombination of oxygen and nitrogen on the composite surface under dissociated air was not significant. Surface recession was insignificant below 1600°C surface temperatures and above 5 kPa of oxygen partial pressure at the stagnation point. Passive-to-active oxidation transition of the composite agreed with Balat's theory for monolithic silicon carbide. A glass sealant prevented active oxidation of the composite for short-time exposures. 相似文献