全文获取类型
收费全文 | 129篇 |
免费 | 0篇 |
学科分类
工业技术 | 129篇 |
出版年
2013年 | 1篇 |
2006年 | 1篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 6篇 |
2000年 | 4篇 |
1999年 | 1篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1992年 | 8篇 |
1991年 | 3篇 |
1990年 | 5篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1983年 | 6篇 |
1982年 | 6篇 |
1981年 | 7篇 |
1980年 | 10篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1977年 | 6篇 |
1976年 | 4篇 |
1975年 | 8篇 |
1974年 | 4篇 |
1973年 | 2篇 |
1972年 | 3篇 |
排序方式: 共有129条查询结果,搜索用时 15 毫秒
1.
2.
3.
Experimental results on flow pattern, hold–up and pressure drop are presented for cocurrent upward and downward air water flow in helical coils. A tube of 0.01 m internal diameter was used and the ratio of coil to tube diameter was varied from 11 to 156.5. Water flow rate was varied from 4.9 × 10-6 m3/s to 92 × 10-6 m3/s while the range of gas flow rate covered was 83 × 10-6 m3/s to 610 × 10-6 m3/s. A new mechanistic approach is proposed to correlate pressure drop data in coils. The proposed model retains the identity of each phase and separately accounts for the effects of curvature and tube inclination resulting from the torsion of the tube. This makes it possible to use a single model to predict pressure drop for both upward and downward two–phase flow in coiled tubes. Required correlations for hold–up, interfacial friction factor and friction factors for individual phases are provided. 相似文献
4.
Liquid phase volumetric mass transfer coefficients for oxygen were determined in three-phase fluidized beds of 8 mm glass spheres fluidized by a cocurrent flow of air and pseudoplastic polysaccharide solutions (carboxymethyl cellulose, xanthan). A semi-theoretical relation for the effective shear rate was suggested. The mass transfer coefficients could be correlated, together with literature data for particle diameters of 3 mm and 5 mm in other liquids, using the terminal velocity as the particle-specific property. 相似文献
5.
Cocurrent and countercurrent absorption and desorption of CO2 in water was investigated in tall bubble columns (length 440 and 720 cm, diameter 15 and 20 cm, respectively). Operating conditions were applied which provided for high interphase mass transfer rates. Under these circumstances the relative gas holdup varies considerably with axial position whereas the mean bubble diameter measured at two points was found to be approximately constant. The measured data permit the calculation of local values of interfacial areas, superficial gas velocities, and frequency factors for bubble coalescence and break up. A dispersion model which takes into account the hydrostatic head and a variable gas velocity was applied to describe the measured concentration profiles in both phases. If increased mass transfer coefficients at the column bottom and measured local values of the hold up were used a striking agreement between experimental and predicted profiles could be obtained. The findings lead to a more sophisticated picture of the complex behaviour of gas-liquid dispersions at high interphase mass transfer rates. 相似文献
6.
We show the experimental and calculated q-dependent low energy loss electron energy loss spectrum of Ru and Ag. The spectra were calculated within the time-dependent density-functional theory including local-field effects. For Ag, the momentum transfer was parallel to the (110) direction. For Ru the three main directions (010), (110) and (001) were investigated. The agreement between theory and experiment is very good for Ag and for momentum transfers parallel to the (001) direction of Ru. For momentum transfers parallel to the in-plane directions (110) and (010) the agreement for Ru is not satisfactory, which could be attributed to relativistic effects or to strong localization of the 4d states of Ru. 相似文献
7.
8.
The influence of the cooling rate on the survival of microorganisms (Lactobacillus plantarum, Escherichia coli, Candida boidinii) during freeze drying was studied. It was found that the optimal cooling rate depends mainly on cell properties (size, membrane structure). Additionally, the influence of the physiological state of the microorganisms and the application of protection media (glycerol, skim milk powder) was investigated. 相似文献
9.
Wolf-Dieter Deckwer 《化学,工程师,技术》1988,60(8):583-590
Bioreactors – State of the art and recognizable future developments. Industrial biotechnological processes, which require monoseptic conditions, are currently performed largely batchwise in stirred tank reactors. A broad-based exploitation of the potential of biotechnology, i.e. both in the production of commodity biologicals/chemicals and in the manufacture of products of the ?new”? biotechnology, requires, for economic and technological reasons, continuous processes and other reactor configurations, which permit increased biomass concentrations by cell retention or immobilization, and integration of work-up operations. 相似文献
10.