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排序方式: 共有226条查询结果,搜索用时 15 毫秒
51.
Toshio Oishi Tetsuya Goto Yoshiro Kayahara Katsutoshi Ono Joichiro Moriyama 《Journal of Electronic Materials》1991,20(12):423-427
The thermodynamic properties of silica-saturated iron silicate slags have been studied from oxygen partial pressure measurements
using a solid electrolyte galvanic cell. The oxygen activity in molten silver bath equilibrated with iron silicate slags was
determined by the following cell type, Pt, NiNiOJO= /slag-Ag(O), LaCrO3, Pt at temperatures between 1473 and 1573 K for the slags ranging in compositions from iron saturation to magnetite saturation.
The oxygen partial pressures obtained in this investigation were in good agreement with those given by the previous study
using the CO-CO2 gas equilibrium method. The data showed that the Fe+ ++/Fe++ ratio is proportional to
.
Formerly Graduate Students, Kyoto University 相似文献
52.
SO2 gas sorption properties were examined for poly(styrene‐co‐chloromethyl styrene) functionalized with N,N‐dimethyl‐1,3‐propanediamine (DMPDA). The DMPDA‐functional copolymers were prepared under various reaction conditions. Two types of SO2 sorption behaviors were observed for these DMPDA‐functional copolymers: SO2 sorption capacity was very high irrespective of slow sorption/desorption rates (type I), and the sorption/desorption rates were very fast while SO2 sorption capacity was small (type II). Fourier transform infrared analysis and dielectric loss measurement revealed that the type II sorption behavior was obtained for the highly crosslinked DMPDA‐functional copolymers. The degree of crosslinking was affected by both the solvent used to react DMPDA with the copolymer and the percent conversion of the chloromethyl styrene group. It was confirmed that DMPDA‐functional copolymers having a highly crosslinked structure are suitable materials in quartz crystal microbalance (QCM)‐type polymeric SO2 gas sensors. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2982–2987, 2003 相似文献
53.
Non-Newtonian effects on the breakup of jets into drops were experimentally studied for power law fluidNdashNewtonian systems under the condition of zero jet velocity relative to the continuous phase. While laminar breakup lengths of Newtonian jets in non-Newtonian liquids agree with the prediction from the stability analysis for Newtonian systems, non-Newtonian jets in Newtonian liquids are less stable than Newtonian jets. Experimental diameters of drops formed from jets in NewtonianNdashnon-Newtonian and in non-NewtonianNdashNewtonian systems are in good agreement with the prediction based on stability analysis for Newtonian systems. 相似文献
54.
In this paper, applicability of ozonation combined with electrolysis as an advanced oxidation process for the removal of 1,4-dioxane from synthetic wastewater, has been studied. The combined process easily decomposed 1,4-dioxane, and two byproducts were detected in treated water. Although bicarbonate alkalinity was a strong radical scavenger, its influence was abated by air-stripping of carbon dioxide at the anodic compartment of the reactor. Free chlorine produced through anodic oxidation of chloride ion accelerated the COD removal from wastewater, despite the fact that this ion acted as a weak radical scavenger. The combined process was demonstrated to be applicable to the treatment of wastewater containing high concentration of bicarbonate alkalinity and chloride ions. 相似文献
55.
Several kinds of (TMPS/DMS) block copolymers having various compositions and segment lengths were synthesized by the polycondensation of p-bis(dimethylhydroxysilyl)benzene and silanol-terminated DMS oligomers of different degrees of polymerization, which were 19, 43, 300, 380 and 540 DMS monomer units. The compositions ranged from TMPS/DMS wt% ratio of 100/0 to 24/76. For these copolymers, differential scanning calorimetry was carried out to determine the melting temperatures, the heat of fusion and the crystallinities. The melting temperatures and the crystallinities of the block copolymers were found to decrease as DMS contents were increased from 11 to 76 wt% and as DMS segment lengths were decreased from 540 to 19. The crystalline parts of TMPS segment would be increased according to the long TMPS sequences which were obtained from the copolymerizations by using DMS oligomers with high degrees of polymerization such as 300, 380 and 540. The stress-strain behaviour and the dynamic mechanical behaviour were also investigated for these copolymers. The tensile strength was decreased and the percentage elongation was increased with increasing DMS content and segment length. In the case of the copolymers for which the DMS contents remained constant at 26 wt%, two major transitions were observed at around ?120° and ?10°C for the copolymers having DMS block sizes of 300, 380 and 540. But for the copolymers having those of 19 and 43 the two transitions merged together at ?50°C. The relaxations at ?120°C corresponding to the glass transition of DMS component and those at ?10°C are due to the amorphous TMPS phase which is separated from the DMS phase owing to the longer sequence length. The relaxation observed around ?50°C is due to the shorter sequence length of TMPS in the main chain plus the presence of more flexible DMS component. It may be suggested that the long sequence length causes large domains of hard and soft phases which consist of TMPS and DMS blocks respectively. 相似文献
56.
To study the transition of the lubricated wear of 0.53% C steel in the steady state, wear tests were carried out by rubbing the annular surfaces of two cylindrical test pieces in machine oil with no additives. The ratio of mating areas was varied to approach actual contact conditions. Three regions of variation in the coefficient of friction with contact load were determined. Fatigue wear, characterized by a friction coefficient μ ≈ 0.05 and a specific wear rate ωs ≈ 0.005 × 10?6 mm3 N?1 m?1, occurs in the first region.A transition from fatigue wear to adhesive wear, with μ ≈ 0.05?0.12 and ωs ≈ (0.005?0.05) × 10?6 mm3 N?1 m?1, takes place gradually within a specific load range. Finally, adhesive wear predominates above the load level that marks the end of the transition. The same behaviour was analysed through stepwise loading tests. The onset of transition and seizure occurs at constant mean surface temperatures. However, the end of transition is also affected by factors other than temperature. The results are compared with the transitions reported by the International Research Group on Wear of Engineering Materials of the Organization for Economic Cooperation and Development. 相似文献
57.
Kamalesh Prasad Shozaburo Mine Yoshiro Kaneko Jun-ichi Kadokawa 《Polymer Bulletin》2010,64(4):341-349
Cellulose-based ionic porous material compatibilized with polymeric ionic liquid was prepared by means of templating technique
using oil/ionic liquid emulsion in the presence of sorbitane monooleate. In situ polymerization of a mixture of polymerizable
ionic liquids, 1-(3-acryloyloxypropyl)-3-methylimidazolium and 1-(3-acryloyloxypropyl)-3-vinylimidazolium bromides was first
performed in a solution of cellulose in a solvent of an ionic liquid, 1-butyl-3-methylimidazolium chloride. The sonication
of the mixture coexisting with corn oil and sorbitan monooleate, followed by the successive treatment with methanol, acetone,
and hexane gave the porous material. The material thus obtained was characterized by the FT-IR, TGA, XRD, and SEM measurements.
The SEM images of the material showed the morphology of the porosity with the pore sizes of around 0.15–1.3 μm accompanied
with the smaller sizes of 30–70 nm. 相似文献
58.
Naraso Borjigin Jun-ichi Nishida Shizuo Tokito Luke Theogarajan Yoshiro Yamashita 《Synthetic Metals》2010,160(21-22):2323-2328
Three new quinoxalinoTTF derivatives with methyl, trifluoromethyl and fluoro groups were synthesized and characterized by UV–vis absorption spectroscopy, differential scanning calorimetry, X-ray single crystal analysis, X-ray diffraction, and field-effect transistor (FET) characteristics. All of them have π-stacking structures in the single crystals. The quinoxalinoTTF derivative with trifluoromethyl groups exhibited an n-type FET, which is a rare example of n-channel FETs based on TTF derivatives. The highest electron mobility is 0.01 cm2 V?1 s. The FET polarity was converted to p-channel from n-channel by replacing the trifluoromethyl groups with methyl groups. The hole mobility is as high as 0.2 cm2 V?1 s. In contrast, the fluoro substituted derivative did not show FET properties due to the poorly ordered molecular arrangement. 相似文献
59.
Yoshiro Tahara Satoshi Kosuge Shin-ichi Sawada Yoshihiro Sasaki Kazunari Akiyoshi 《Reactive and Functional Polymers》2013,73(7):958-964
Polysaccharide nanogels are one of the most attractive carriers for drug delivery systems. Nanogels encapsulate proteins in their hydrated polymer networks, and minimize the denaturation of proteins. In this study, we demonstrated the cross-linking of acryloyl group-modified polysaccharide nanogels via photopolymerization, which allowed the formation of novel hydrogel particles and macrogels. The mechanical properties of the resultant hydrogels depended on the concentrations of the nanogels and the cross-linkers. The most significant property of the nanogel-cross-linked hydrogel was the ability to encapsulate insulin via hydrophobic interactions. After incubation of the hydrogel containing insulin in water, the hydrogel was degraded by hydrolysis, and insulin was gradually released from the hydrogels over a period of 1 week. According to these results, this nanogel-cross-linked hydrogel prepared via photopolymerization has potential for innovative biomaterials. 相似文献
60.
The effect of diluents on isotactic polypropylene (iPP) membrane formation via thermally induced phase separation was investigated. The diluents were methyl salicylate (MS), diphenyl ether (DPE), and diphenylmethane (DPM). The cloud-point curve was shifted to a lower temperature in the order iPP–MS, iPP–DPE, and iPP–DPM, whereas the crystallization temperature was not influenced so much by diluent type. Droplet-growth processes were investigated under two conditions: quenching the polymer solution at the desired temperature and cooling at a constant rate. Although droplet sizes were in the order iPP–MS, iPP–DPE, and iPP–DPM in both cases, the difference was more pronounced with the constant cooling rate condition. Scanning electron microscopy indicated that interconnected structures were obtained when the polymer solution was quenched in ice water. The effect of the diluents on these structures was observed. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 169–177, 2001 相似文献