全文获取类型
收费全文 | 119篇 |
免费 | 1篇 |
专业分类
化学工业 | 18篇 |
金属工艺 | 4篇 |
机械仪表 | 6篇 |
建筑科学 | 5篇 |
轻工业 | 68篇 |
无线电 | 1篇 |
一般工业技术 | 5篇 |
冶金工业 | 3篇 |
自动化技术 | 10篇 |
出版年
2020年 | 2篇 |
2017年 | 1篇 |
2013年 | 20篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2007年 | 3篇 |
2006年 | 1篇 |
2004年 | 1篇 |
2003年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 6篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 5篇 |
1971年 | 3篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1967年 | 2篇 |
1966年 | 3篇 |
1964年 | 1篇 |
1959年 | 1篇 |
1955年 | 1篇 |
1954年 | 1篇 |
1947年 | 2篇 |
1938年 | 1篇 |
排序方式: 共有120条查询结果,搜索用时 546 毫秒
101.
102.
J. C. CURRAN BSc BA PhD CPhys CEng M. ROBERTSON BSc 《Water and Environment Journal》1991,5(4):419-424
The catchment of the upper Clyde estuary has experienced a significant and steady increase of rainfall over the past twenty years. The corresponding increase of runoff has had a positive impact on the water quality both of the individual rivers and of the estuary. Examples are provided to show that approximately one third of some observed improvements are attributable to the additional dilution. It is emphasized that comparisons of water quality data, either by region or by period, should allow for climate variability. 相似文献
103.
Differential scanning calorimetry thermal curves of beef semimembranosus muscle showed peaks at 58, 67 and 78°C. Addition of algin/calcium binder or 5-10% connective tissue increased magnitude of the 58°C peak. For crude myofibrillar, sarcoplasmic and connective tissue proteins thermal destabilization was lowered by 7.5, 23.6 and 8.6°C, respectively, with addition of algin/calcium binder. Destabilization of tendon by the binder from about 67°C to 58°C was similar in magnitude to the shift of the 67-68 and 58°C thermal transitions reported in semimembranosus and probably indicated collagen destabilization. Thermal destabilization by algin/calcium may indicate change in physical state of proteins which could influence texture of algin/calcium restructured meat products. 相似文献
104.
Abstract Some design issues relevant to the adaptation of small satellites for remote sensing applications are presented. Particular emphasis is placed on those areas which will necessitate the advancement of current small satellite technology. The aim of such a programme would be to provide a cost-effective but reliable way of obtaining remotely sensed data from a range of novel sensors, thus complementing the efforts of major missions towards the 21st century. 相似文献
105.
106.
107.
108.
109.
H. V. SMITH PhD LUCY J. ROBERTSON PhD R. A. GILMOUR BSc PhD MRIEHIS G. P. MORRIS BSc MRIEHIS R. W. A. GIRDWOOD FRCPath P. G. SMITH BSc MSc PhD 《Water and Environment Journal》1993,7(6):632-635
The occurrence of Giardia cysts in Scottish raw and potable waters was investigated. Giardia cysts were detected in 49% of raw waters, with concentrations of up to 1.05 cysts per litre, and in 19% of final waters, with concentrations of up to 1.67 cysts per litre. In some of the positive water samples the viability of the cysts was assessed by viewing the cyst morphology and inclusion/exclusion of propidium iodide. Viable cysts were detected in a proportion of both raw waters and positive final waters studied. Further investigations at 21 water-treatment plants revealed cysts in 9 (43%) of the raw waters, and in 4 (19%) of the final waters. Cysts were only detected in the final waters of plants in which cysts were also detected in the raw water. These data indicate that viable Giardia cysts may be ingested with potable water in Scotland. 相似文献
110.
Diffusion of Iron and Nickel in Magnesium Oxide Single Crystals 总被引:1,自引:0,他引:1
Diffusion kinetics and mechanisms were studied in the Fex O-MgO (vacuum), NiO-MgO (vacuum and air), and Fe2 03 -MgO (air) systems. In the Fex O-MgO system, Fe entered MgO by a redox reaction; the diffusivity and activation energy depended on concentration. In the NiO-MgO system in air the diffusivity depended on concentration and the activation energy did not; in vacuum both the diffusivity and activation energy were concentration-independent. In the Fe2 O3 -MgO system in the MgO phase the activation energy and diffusivity did not depend on concentration. Because of impurities, the diffusion results were for the extrinsic region. Formation of trivalent ions and consequent chemically created vacancies in the Fex O-MgO and NiO-MgO (air) systems resulted in the concentration dependence of diffusivity. Concentration dependence of activation energy in the Fex O-MgO system is associated with structural changes due to a change with concentration of the Fe3+ octahedraI/Fe3+ tetrahedral ratio. In the Fe2 O3 -MgO system structural changes do not occur during diffusion because this ratio remains constant. 相似文献