全文获取类型
收费全文 | 247篇 |
免费 | 9篇 |
专业分类
电工技术 | 6篇 |
化学工业 | 121篇 |
金属工艺 | 13篇 |
机械仪表 | 2篇 |
建筑科学 | 8篇 |
轻工业 | 26篇 |
石油天然气 | 1篇 |
无线电 | 6篇 |
一般工业技术 | 50篇 |
冶金工业 | 6篇 |
原子能技术 | 10篇 |
自动化技术 | 7篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 8篇 |
2012年 | 7篇 |
2011年 | 14篇 |
2010年 | 9篇 |
2009年 | 13篇 |
2008年 | 7篇 |
2007年 | 9篇 |
2006年 | 11篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 7篇 |
2001年 | 7篇 |
2000年 | 4篇 |
1999年 | 10篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 3篇 |
1995年 | 5篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 14篇 |
1990年 | 8篇 |
1989年 | 4篇 |
1988年 | 8篇 |
1987年 | 13篇 |
1986年 | 8篇 |
1985年 | 10篇 |
1984年 | 7篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1973年 | 2篇 |
1970年 | 1篇 |
1968年 | 1篇 |
1967年 | 2篇 |
排序方式: 共有256条查询结果,搜索用时 15 毫秒
91.
The tackiness properties of radiation‐vulcanized natural rubber latex (RVNRL) film surfaces coated by various monomers were investigated in order to define the suitable hydrogels which reduce the tackiness of the film. In this context, different types of monomers, namely, N‐vinyl‐2‐pyrrolidone (NVP), N,N‐dimethylaminoethylamide (DMAEA), acrylic acid (AAc), n‐butyl acrylate (n‐BA), and 2‐hydroxyethyl methacrylate (HEMA) as well as the monomer mixtures were tried with varying degrees of success. Coating the RVNRL film with 80% HEMA/20% n‐BA by irradiation at 80 kGy using a low‐energy electron beam gave a remarkable reduction in the surface tackiness of the RVNRL film. Several other attempts were made such as priming the RVNRL film with acid and aluminum sulfate prior to coating, mixing the aluminum sulfate into the monomer mixtures, and dipping the partially wet RVNRL film into the monomer to enhance the wettability of the monomers with the film. The photomicrographs taken illustrate that the decrease in tackiness with the coating is due to the increase of the surface roughness at an 80‐kGy irradiation dose. The studies also revealed that the reduction in the contact angle and the increase in water absorption of the RVNRL film after irradiation are due to the formation of the hydrogel layer. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 1421–1428, 1999 相似文献
92.
The distribution of radioactivity among the molecular species of diacyl glycerophosphocholine of rabbit alveolar macrophages
was determined after incubation with [3H]glycerol and 1-[14C]palmitoyl-sn-glycero-3-phosphocholine. The highest percentage of radioactivity of [3H]glycerol was found in the dipalmitoyl species (35% of the total) followed by the 1-palmitoyl-2-linoleoyl (23.6%) and 1-stearoyl-2-linoleoyl
plus 1-palmitoyl-2-oleoyl species (19.7%) during the first 30 min incubation. The radioactivity of the dipalmitoyl species
reached a maximum at 120 min incubation and decreased thereafter, although the radioactivities of other molecular species
still increased. In contrast to the [3H]glycerol labeling, only 4% of the total radioactivity in diacyl glycerophosphocholine derived from 1-[14C]palmitoyl glycerophosphocholine was found in the dipalmitoyl species; 80% of the radioactivity was located in the 1-palmitoyl-2-arachidonoyl
species at 10 min incubation. The present results indicate that the dipalmitoyl species of diacyl glycerophosphocholine are
synthesized predominantly via a de novo pathway and not the deacylation-reacylation pathway in rabbit alveolar macrophages. 相似文献
93.
Takayuki Sugiura Motoko Nakajima Nobuyuki Sekiguchi Yasuhito Nakagawa Keizo Waku 《Lipids》1983,18(2):125-129
High levels of ether phospholipids were found in rabbit alveolar macrophages. Choline phosphoglycerides (CPG) contained a
significant amount of alkylacyl compound (32.5%). On the other hand, ethanolamine phosphoglyceride (EPG) included a very large
amount of alkenylacyl compounds (61.2%). Small amounts of alkenylacyl CPG and alkylacyl EPG were also observed. The occurrence
of a high amount of alkylacyl CPG may be related to the synthesis or release of platelet-activating factor (PAF) from macrophages.
Fatty chains at the 1- and 2-positions in each lipid class of CPG or CPG or alkenylacyl EPG were several other. Particularly,
the levels of 20∶4 (arachidonic acid) in alkylacyl CPG or alkenylacyl EPG were several times higher than those in corresponding
diacyl phospholipids. Large portions of 20∶4-containing species have alkenyl or alkyl ether moieties at their 1-position in
both CPG (73.6%) and EPG (85.9%). These results suggest the importance of ether-containing phospholipids in rabbit alveolar
macrophages. 相似文献
94.
Nobuhiro Shinohara Masataro Okumiya Tadashi Hotta Kenji Nakahira Makio Naito Keizo Uematsu 《Journal of the American Ceramic Society》2000,83(7):1633-1640
Large pore defects clearly develop in Al2 O3 ceramics during sintering. These large pores originate from voids caused by the incomplete deformation and adhesion of powder particles in collapsed dimples at the centers and boundaries of granules in the green compacts. The coalescence of pores, with limited shrinkage, during densification and grain growth in the late intermediate to final stages of sintering, is considered responsible for the development of the large pores. The mechanism of pore coalescence is explained by thermodynamic arguments, which demonstrate that the largest pores result in a stable system. 相似文献
95.
96.
Matsui T Miura A Iiyama T Shinzato N Matsuda H Furuhashi K 《Journal of hazardous materials》2005,118(1-3):255-258
The performance of an immobilized continuous fluidized reactor for salad oil-containing model wastewater was examined at a high loading rate using polyurethane as a support, to be applied in fat- and oil-containing wastewater treatment, generated by daily activities in restaurant kitchens. At an organic loading rate higher than 0.6 kg/m3/day, there was a significant amount of white solid (WS), identified as a mixture of calcium di-stearate and di-palmitate, suggesting that saturated fatty acid degradation was limited at such a high loading rate, possibly due to its solubility in the wastewater. Increased oil dispersion by the addition of a surfactant ranging from 10 to 100 microm particle size could result in less than 30 mg/l oil concentration after the treatment at 5 kg/m3/day. 相似文献
97.
Yoshimitsu Sakaguchi Keizo Kawahara Takatoshi Yamada Yasuyuki Okazaki Satoshi Imahashi 《应用聚合物科学杂志》2004,92(5):2903-2907
A water‐developable flexographic printing plate consisting of poly(acrylonitrile‐co‐butadiene), polybutadiene, and carboxylated polyurethane as a polymer matrix, hexanediol dimethacrylate and polybutadiene diacrylate as reactive monomers, and benzildimethylketal as a photoinitiator was prepared and its photoreaction followed by structural change caused by the diffusion of unreacted monomers was characterized. Analysis combined 13C‐NMR and attenuated total reflection (ATR) FTIR showed the photoreaction occurred predominantly at the surface of exposure to the light at first, and then the reaction proceeded to the direction of the opposite surface with an increase in the exposure time. Diffusion of unreacted monomers after the photoreaction from the unexposed side to the exposed side was monitored by ATR FTIR. The diffusivity of unreacted monomers was dependent on the extent of photoreaction in the plate and the molecular weight of diffusing monomers. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2903–2907, 2004 相似文献
98.
M. Teramura S. Yasuzuka K. Yokogawa T. Sasaki K. Wada T. Hiraoka T. Hayashi H. Fujiwara T. Sugimoto Keizo Murata 《Journal of Low Temperature Physics》2006,142(3-4):489-493
The magnetoresistance (MR) for a new organic conductor, β”-(EDOTTFVO)2 FeCl4 which exhibits metallic temperature dependence of the resistivity down to 0.3 K, was studied. Remarkable and unusual features
were found: isotropic MR below 3 T, dip anomaly below 3 K, and SdH effect above 17 T. These features are discussed in terms
of an interaction between the π-electrons on the EDO-TTFVO donors and the d-spins on the magnetic FeCl4− ions. 相似文献
99.
Lin Li Syuma Yasuzuka Yufeng Weng Keiichi Yokogawa Tsutomu Fujimoto Toyonari Sugimoto Hideki Fujiwara Toshiki Hayashi Takashi Hiraoka Keizo Murata 《Journal of Low Temperature Physics》2006,142(3-4):473-476
Hall resistance and magnetic torque measurements have been carried out in the field-induced spin-density-wave (FISDW) phase
of deuterated (TMTSF)2ClO4 for various cooling rates through the anion ordering temperature. We have found that the Hall resistance in the intermediate
cooled state shows a phase transition from the non-quantized Hall phase to the quantized Hall phase (n=1) with hysteresis.
We have also found that the magnetic torque in the non-quantized Hall phase rapidly decreases with increasing cooling rate.
These results suggest that there is a new phase transition from the non-quantized Hall phase to the quantized Hall phase in
(TMTSF)2ClO4. 相似文献
100.
K. Kobayashi S. Yasuzuka T. Nakanishi K. Yokogawa H. Nishikawa H. Yoshino Keizo Murata 《Journal of Low Temperature Physics》2006,142(3-4):327-330
A new TTP donor, Me-DH-TTP (2-methyl-5-(1,3-dithiolan-2-yliden)-1,3,4,6-tetrathiapentalene), was designed to realize a system
with large on-site Coulomb repulsion as compared with the previously known bis-fused type TTP donors. Probably as a consequence,
(Me-DH-TTP)2AsF6 exhibits semiconducting behavior from room temperature to liquid helium temperature. By increasing pressure, metallic behavior
appears below 300 K, and with distinct metal-insulator (M-I) transition up to 2.2 GPa. This M-I transition suddenly disappears
beyond 2.5 GPa, and metallic state is stabilized down to 2.6 K. We discuss the possibility of quantum critical point around
2.4 GPa. 相似文献