全文获取类型
收费全文 | 110篇 |
免费 | 5篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 10篇 |
机械仪表 | 13篇 |
建筑科学 | 11篇 |
能源动力 | 1篇 |
轻工业 | 16篇 |
水利工程 | 1篇 |
无线电 | 5篇 |
一般工业技术 | 18篇 |
冶金工业 | 36篇 |
自动化技术 | 2篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 4篇 |
2012年 | 3篇 |
2011年 | 4篇 |
2010年 | 4篇 |
2009年 | 2篇 |
2008年 | 9篇 |
2007年 | 3篇 |
2006年 | 6篇 |
2005年 | 6篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 7篇 |
1999年 | 1篇 |
1998年 | 11篇 |
1997年 | 4篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 4篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有115条查询结果,搜索用时 0 毫秒
11.
Rate data on liquefaction of a series of low pyrite bituminous coals in tetralin at 400 °C have been measured. Rates of disappearance of coal and rates of formation of oils, asphaltenes, and preasphaltenes have been determined, and kinetic parameters for coal disappearance calculated based on a second-order rate expression. The usefulness of kinetic rate constants as sensitive reactivity ranking factors is demonstrated. 相似文献
12.
JA Palmore MJ Furlong FX Buchmeier IH Park LM Souder 《Canadian Metallurgical Quarterly》1976,7(12):349-356
The characteristics of Korean family planning opinion leaders are assessed through a secondary analysis of the 1971 national survey conducted by the Korean Institute for Research in the Behavioral Sciences. In effect, what characterized Korean family planning opinion leaders was a rather national and democratic model. Those who had tried methods, discussed them, and knew a lot about them assumed leadership roles more than others. Place of residence, education, and other such variables mattered relatively little unless a woman had credibility imparted by actual use and knowledge imparted by use or discussions with family planning professionals. 相似文献
13.
Hou Kaiming Bavisotto Robert Manzi Sergio Javier Perez Eliseo Joaquín Furlong Octavio Javier Kotvis Peter Kenmoe Germaine Djuidje Tysoe Wilfred T. 《Tribology Letters》2022,70(2):1-19
Tribology Letters - Most asteroids with a diameter larger than $$\sim 300 \ {\mathrm{m}}$$ are rubble piles, i.e., consisting of more than one solid object. All asteroids are rotating but almost... 相似文献
14.
It is demonstrated that the surface chemistry of simple-model extreme-pressure lubricant additives, measured in ultrahigh vacuum, corresponds to that measured at higher pressures, where film growth rates are monitored using a microbalance. This chemistry and reaction kinetics are used to explain the extreme-pressure lubrication behavior by successfully modeling the measured seizure load vs. additive concentration curves. It is also demonstrated, by growing ferrous chloride films on iron substrates in ultrahigh vacuum, that these have the same friction coefficients as those found for model extreme-pressure lubricants. It is found that a monolayer of a solid boundary lubricant film is sufficient to lower the interfacial friction coefficient to its minimum value. These results demonstrate that the chemistry measured under conditions of thermodynamic equilibrium at some temperature can be successfully applied to the formation of a boundary film, in the extreme-pressure regime. 相似文献
15.
Barber LB Murphy SF Verplanck PL Sandstrom MW Taylor HE Furlong ET 《Environmental science & technology》2006,40(2):475-486
Identifying the sources and impacts of organic and inorganic contaminants at the watershed scale is a complex challenge because of the multitude of processes occurring in time and space. Investigation of geochemical transformations requires a systematic evaluation of hydrologic, landscape, and anthropogenic factors. The 1160 km2 Boulder Creek Watershed in the Colorado Front Range encompasses a gradient of geology, ecotypes, climate, and urbanization. Streamflow originates primarily as snowmelt and shows substantial annual variation. Water samples were collected along a 70-km transect during spring-runoff and base-flow conditions, and analyzed for major elements, trace elements, bulk organics, organic wastewater contaminants (OWCs), and pesticides. Major-element and trace-element concentrations were low in the headwaters, increased through the urban corridor, and had a step increase downstream from the first major wastewater treatment plant (WWTP). Boron, gadolinium, and lithium were useful inorganic tracers of anthropogenic inputs. Effluent from the WWTP accounted for as much as 75% of the flow in Boulder Creek and was the largest chemical input. Under both hydrological conditions, OWCs and pesticides were detected in Boulder Creek downstream from the WWTP outfall as well as in the headwater region, and loads of anthropogenic-derived contaminants increased as basin population density increased. This report documents a suite of potential endocrine-disrupting chemicals in a reach of stream with native fish populations showing indication of endocrine disruption. 相似文献
16.
Tania Aparecida Becker‐Algeri Denise Castagnaro Kennidy de Bortoli Camila de Souza Deisy Alessandra Drunkler Eliana Badiale‐Furlong 《Journal of food science》2016,81(3):R544-R552
This paper presents a literature review of the occurrence of several mycotoxins in bovine milk and dairy products, because it is the main type of milk produced and marketed worldwide. Mycotoxins are produced by different genera of filamentous fungi and present serious health hazards such as carcinogenicity and mutagenicity. Under favorable growth conditions, toxigenic fungi produce mycotoxins which contaminate the lactating cow's feedstuff. During metabolism, these mycotoxins undergo biotransformation and are secreted in milk. Data show that there is a seasonal trend in the levels of mycotoxins in milk, with these being higher in the cold months probably due to the prolonged storage required for the cattle feeds providing favorable conditions for fungal growth. Good agricultural and storage practices are therefore of fundamental importance in the control of toxigenic species and mycotoxins. Although aflatoxins (especially aflatoxin M1) are the mycotoxins of greater incidence in milk and dairy products, this review shows that other mycotoxins, such as fumonisin, ochratoxin A, trichothecenes, zearalenone, T‐2 toxin, and deoxynivalenol, can also be found in these products. Given that milk is widely consumed and is a source of nutrients, especially in childhood, a thorough investigation of the occurrence of mycotoxins as well the adoption of measures to minimize their contamination of milk is essential. 相似文献
17.
The frictional properties of a sliding copper-copper interface exposed to dimethyl disulfide (DMDS) are measured in UHV under conditions at which the interfacial temperature rise is <1 K. A significant reduction in friction is found from the clean-surface values and sulfur is found on the surface and below the surface in the wear scar region by Auger spectroscopy. Because the interfacial temperature rise under the experimental conditions used to measure friction is very small, tribofilm formation is not thermally induced. The novel, low-temperature tribofilm formation observed here is ascribed to a shear-induced intermixing of the surface layer(s) with the subsurface region as suggested using previous molecular dynamics simulations. Although the tribofilm contains predominantly sulfur, a small amount of carbon is also found in the film. 相似文献
18.
Sugar fatty acid ester surfactants: Base-catalyzed hydrolysis 总被引:1,自引:0,他引:1
Irene J. A. Baker D. Neil Furlong Franz Grieser Calum J. Drummond 《Journal of surfactants and detergents》2000,3(1):29-32
Rate constants for the base-catalyzed hydrolysis of sucrose laurate, sucrose α-sulfonyl laurate, and sucrose α-ethyl laurate
were measured at several temperatures in pH 11 buffer. Activation energies and Arrhenius factors for the hydrolysis reactions
were determined. At 27°C, sucrose laurate hydrolyzed fastest and sucrose α-ethyl laurate slowest. Activation energies and
Arrhenius factors showed that both steric and electronic factors affect the rates of ester hydrolysis. Other work has shown
that bacterial hydrolysis of sugar fatty acid esters is inhibited in the presence of either α-sulfonyl or α-alkyl groups.
A kinetic study of base-catalyzed ester hydrolysis has revealed reasons for the inhibition of bacterial hydrolysis and provided
information regarding ester stability at elevated pH. 相似文献
19.
Irene J. A. Baker Barry Matthews Hector Suares Irena Krodkiewska D. Neil Furlong Franz Grieser Calum I. Drummond 《Journal of surfactants and detergents》2000,3(1):1-11
Ultimate aerobic biodegradabilities of an array of sugar ester surfactants were determined by International Standards Organisation
method 7827, “Water Quality—Evaluation in an Aqueous Medium of the Aerobic Biodegradability of Organic Compounds, Method by
Dissolved Organic Carbon” (1984). The surfactants were nonionic sugar esters with different-sized sugar head groups (formed
from glucose, sucrose, or raffinose) and different lengths and numbers of alkyl chains [formed from lauric (C12) or palmitic (C16) acid]. Analogous anionic sugar ester surfactants, formed by attaching an α-sulfonyl group adjacent to the ester bond, and
sugar esters with α-alkyl substituents were also studied. It was found that variations in sugar head group size or in alkyl
chain length and number do not significantly affect biodegradability. In contrast, the biodegradation rate of sugar esters
with α-sulfonyl or α-alkyl groups, although sufficient for them to be classified as readily biodegradable, was dramatically
reduced compared to that of the unsubstituted sugar esters. An understanding of the relationship between structure and biodegradability
provided by the results of this study will aid the targeted design of readily biodegradable sugar ester surfactants for use
in consumer products. 相似文献
20.
There has been a rapid increase in the number of so-called new roles in nursing. These have tended to develop in a random way. Consequently, titles are not a good indicator of what the role entails. The qualifications required to undertake a particular role are not clear and tend to be locally defined. This paper discusses the implications of this situation. Two subsequent articles will examine issues around patient consent, care provided by nurses in new roles and legality and accountability. 相似文献