全文获取类型
收费全文 | 283篇 |
免费 | 6篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 15篇 |
化学工业 | 101篇 |
金属工艺 | 4篇 |
机械仪表 | 4篇 |
建筑科学 | 11篇 |
矿业工程 | 1篇 |
能源动力 | 22篇 |
轻工业 | 22篇 |
武器工业 | 1篇 |
无线电 | 29篇 |
一般工业技术 | 28篇 |
冶金工业 | 20篇 |
原子能技术 | 2篇 |
自动化技术 | 30篇 |
出版年
2019年 | 3篇 |
2018年 | 8篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2015年 | 5篇 |
2014年 | 3篇 |
2013年 | 27篇 |
2012年 | 7篇 |
2011年 | 16篇 |
2010年 | 12篇 |
2009年 | 9篇 |
2008年 | 11篇 |
2007年 | 8篇 |
2006年 | 5篇 |
2005年 | 2篇 |
2004年 | 8篇 |
2003年 | 10篇 |
2002年 | 7篇 |
2001年 | 8篇 |
2000年 | 10篇 |
1999年 | 8篇 |
1998年 | 8篇 |
1997年 | 7篇 |
1996年 | 8篇 |
1995年 | 7篇 |
1994年 | 2篇 |
1993年 | 8篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1990年 | 3篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1986年 | 6篇 |
1985年 | 3篇 |
1984年 | 6篇 |
1983年 | 4篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 6篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1973年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1968年 | 2篇 |
1967年 | 1篇 |
1964年 | 1篇 |
1938年 | 1篇 |
1934年 | 2篇 |
排序方式: 共有290条查询结果,搜索用时 15 毫秒
101.
Model dyeing and laundering wastewaters produced during two basic technological operations of the textile industry were subjected to treatment by advanced oxidation processes (AOPs). The following agents were used: ozone (O3), hydrogen peroxide (H2O2) and UV radiation. They were applied separately and in all possible combinations: O3 + UV, O3 + H2O2, UV + H2O2, as well as all three at the same time: O3 + UV + H2O2. Effluents before and after the treatment were analyzed according to requirements of the Polish Standards that included pH, color threshold, COD and concentration of anionic and non-ionic surfactants. Ozonation was carried out in a lab-scale bubble column reactor with a centrally located UV burner. The most effective version of AOPs proved to be the simultaneous use of all three agents. In the case of such treatment of dyeing wastewaters nearly complete discoloration and full decomposition of surface-active substances were obtained at 80% reduction of COD. A similar tendency was observed in the case of laundering wastewater, though in that case the results were slightly worse, which may be explained by much higher initial concentrations of the pollutants. Good treatment effects have also been obtained in combined treatment by simultaneous use of hydrogen peroxide and ozone. 相似文献
102.
Stanislaw Kalicinski Martine Wevers Ingrid De Wolf 《Microelectronics Reliability》2008,48(8-9):1221-1226
This paper presents a first study concerned with charging and discharging phenomena in single crystal silicon MEM resonators. It is shown that the DC voltage required for the device operation induces a residual voltage between the resonator and its driving electrode, which is attributed to dielectric charging. The residual voltage can affect the device series resonance frequency and is determined from the measurements. The residual voltage maximum amplitude and the charging rate depend not only on the stressing voltage amplitude but also on the polarization. 相似文献
103.
We propose a new class of infinitely many bounded output feedback controllers for uncertain dynamic systems with bounded uncertainties. No statistical information about the uncertainties is assumed. A variable structure systems approach is employed in the synthesis of the proposed output feedback controllers. The role of the system zeros in the output feedback stabilization using the variable structure approach is discussed. We show that the proposed controllers guarantee the practical stability of the closed-loop system and give estimates of the regions of practical stability. 相似文献
104.
Kwasniok P.J. Bui M.D. Kozlowski A.J. Stanislaw S.S. 《Electromagnetic Compatibility, IEEE Transactions on》1993,35(1):87-90
A method for measuring power line impedances using two current probes is examined. This method is characterized by good isolation of the measurement equipment from the power line voltage and by the capability of measuring power line impedances between any pair of power-plug terminals. The use of this two-current probe method with the model described is effective in measuring power line impedances from 0.5 MHz to 100 MHz. Using purely resistive loads for calibration, the error is less than 5% for frequencies below 100 MHz, and less than 20% for frequencies between 100 MHz and 500 MHz. The error in an impedance measurement increases with the magnitude of the load impedance 相似文献
105.
106.
From the emf measurements of the cell Pt/Zn(Hg)/ZnCl2, H2O, organic co-solvent/AgCl/Ag the standard emf of the cell have been determined for dioxan (10,20 and 30 wt%), acetone (10, 20 and 30 wt%) and acetic acid (10, 20, 30, 50, 70 and 90 wt%) mixtures with water at 298 K. These data were used in calculations of: (a) the mean activity coefficients of zinc chloride (b) the primary medium effect (c) the standard Gibbs energies of transfer of zinc chloride from water to mixed solvents. The standard Gibbs energies for the transfer process have been interpreted in regard to the acid-base (in Lewis meaning) properties of the water molecules in mixed solvents. 相似文献
107.
The paper presents an investigation on the relation between energy use and economic activity in eight industrial sectors in the United Kingdom, West Germany, and Italy. The approach relies on the analysis of time-series data. In the first section, we point to the role of energy in its interrelationship with the structural characteristics of the national economies. Subsequently, having observed that unit energy requirements vary in the same sector across the three countries, the analysis focuses on possible explanations. The different unit energy consumption pattern, as exhibited by most of the Italian sectors when compared with both the British and the West German ones, is not related to different unit labour and unit capital utilisation patterns. The lack, in the Italian sectors, of a large coal consumption share in the first post-war decade provides an intuitively plausible explanation for the observed unit energy consumption. We test the hypothesis that interfuel substitution alone can account for increased energy productivity. From the results obtained, we deduce that, for a small subset of our sectors, the tested hypothesis turns out to be a meaningful one. In a subsequent section, we analyse and compare the substitution characteristics and the price elasticities of consumption for four fuels. We also take account of the price of labour. Our results support the conclusion that electricity tends to be used as a complement to the other fuels, while the fossil fuels substitute for each other. 相似文献
108.
A new active R network realising the nth-order voltage transfer function is presented. A synthesis technique based on the flow-graph representation is given. 相似文献
109.
110.
Occurrence of Salmonella spp. in consumption eggs in Poland 总被引:1,自引:0,他引:1
Radkowski M 《International journal of food microbiology》2001,64(1-2):189-191
The purpose of this study was to determine the prevalence of Salmonellae on egg shells in markets in Olsztyn, Poland. An investigation carried out by the Sanitary and Epidemiological Station into cases of food poisoning caused in Poland by Salmonella spp. in recent years showed that the largest number of outbreaks is connected with consuming foods containing hens eggs which had not undergone heat treatment, such as mayonnaise, creams, ice-cream and other products. The world egg production amounts to 400 billion, in Poland it reaches the level of around 8 billion per year. A total of 1200 eggs were purchased in 40 local markets in Olsztyn were examined for the presence of Salmonella between June 1997 and December 1998. Salmonella was not found on the shell or inside the eggs. From this study it would appear that the incidence of Salmonellae on eggs from Olsztyn shops is very low. 相似文献