全文获取类型
收费全文 | 143篇 |
免费 | 14篇 |
国内免费 | 7篇 |
专业分类
综合类 | 13篇 |
化学工业 | 72篇 |
金属工艺 | 4篇 |
机械仪表 | 4篇 |
建筑科学 | 16篇 |
矿业工程 | 1篇 |
能源动力 | 1篇 |
轻工业 | 3篇 |
水利工程 | 6篇 |
石油天然气 | 7篇 |
武器工业 | 2篇 |
无线电 | 4篇 |
一般工业技术 | 17篇 |
冶金工业 | 1篇 |
原子能技术 | 2篇 |
自动化技术 | 11篇 |
出版年
2023年 | 2篇 |
2021年 | 2篇 |
2020年 | 6篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 2篇 |
2015年 | 6篇 |
2014年 | 4篇 |
2013年 | 4篇 |
2012年 | 6篇 |
2011年 | 9篇 |
2010年 | 12篇 |
2009年 | 11篇 |
2008年 | 13篇 |
2007年 | 13篇 |
2006年 | 6篇 |
2005年 | 5篇 |
2004年 | 10篇 |
2003年 | 10篇 |
2002年 | 5篇 |
2001年 | 6篇 |
2000年 | 7篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 6篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1985年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有164条查询结果,搜索用时 31 毫秒
91.
92.
Ameena Ahmadi 《Architectural Design》2015,85(1):46-53
Ameena Ahmadi is Architecture Manager at the Qatar Foundation, overseeing the development of the masterplan and facilities of Education City in Doha, a multi-institution educational campus, incorporating schools and universities. Ahmadi describes how education is a significant cornerstone for Qatar's national transition ‘to a knowledge-based’ economy from a ‘hydrocarbon-based’ one. This is symbolised by substantial investment in the flagship Education City with its Arata Isozaki masterplan and its individual schools and universities designed by premier international architects. 相似文献
93.
Sulfoxylated methyl esters (Φ-MES) are obtained via sulfoxidation of fatty acid methyl esters with SO2, O2, and ultraviolet light of appropriate wavelength. These products may be used as co-surfactants with linear alkylbenzene sulfonate
and alkyl ether sulfate, either in heavy-duty or in hand dishwashing liquids. Standard hand dishwashing formulations based
on Φ-MESC16 are presented and discussed with regard to solubility, viscosity, performance, and skin compatibility. The experimental results
obtained indicate that the above-mentioned products can be regarded as potential components for liquid formulations. 相似文献
94.
95.
在洗洁精配方中,采用MES与LAS、AES复配作为主表面活性剂,不但可以减少AES添加量,而且可以不使用洗洁精配方中常用的增稠剂6501,在保持洗洁精质量(去污力、低温稳定性、粘度)同时,使配方成本更加合理. 相似文献
96.
碳纤维/锂铝硅(LAS)玻璃陶瓷的界面结构及界面反应 总被引:2,自引:1,他引:1
用TEM,EDAXJ SAD,XPS,SEM等手段,分别对两种成分的锂铝硅(LAS)系统玻璃陶瓷(LAS_I和LAS(?))为基材在不同热压时间下获得的具有不同强度和韧性的碳纤维补强复合材料的界面及从复合材料萃取出来的纤维表面进行了研究。短时同热压的碳纤维-LAS_I界面层窄,界面较致密,而长时同热压,界面层变宽且疏松。碳纤维-LAS(?)存在较宽的气体扩散层界面,界面区还含有由界面反应生成的NbC颗粒,较长时间的热压,界面层变窄,NbC颗粒沉积在纤维上,改善了界面结构。界面反应和界面结构的形成及其对复合材料性能的影响进行了分析和讨论。 相似文献
97.
The effect of the concentration of linear alkylbenzene sulfonate (LAS) on soil removal efficiency at various water hardnesses
was studied. The present investigation indicates that: (i) For each LAS concentration, a calcium ion concentration interval
exists, defined by 0.78<(Log(LAS)/Log(Ca))<0.85, where the detergency reaches a maximum; (ii) 24 h after having been prepared,
the solutions present either clear solutions (water appearance), milky solutions (without precipitate in the bottom of the
bottle), or clear solutions with precipitate in the bottom of the bottle. The milky solutions correspond to the defined interval.
The solutions where the relationship LAS/Ca is defined are located, surprisingly in a precise zone of the LAS-calcium solubility
diagram. The study has been carried out with and without ionic strength buffering, and the addition of electrolyte moves the
maximum detergency performance interval to higher calcium concentrations. 相似文献
98.
The lethal and sub-lethal toxicity of LAS congeners to the mollusc gastropod Hydrobia ulvae were assessed in spiked sediment bioassays. This complements the little knowledge available to date on mixture effects in the sediment compartment. The LAS homologues joint effect was concentration additive (∑TUi = 0.8-1). As opposed to the 10-d LC10 based on the sediment associated LAS concentration (91-330 mg/kg) which was independent of the homologue chain length, the LC10 based on the dissolved LAS fraction (0.804-0.068 mg/L) decreased as the homologue chain length increased from 10 to 13 carbons. The quantitative structure-activity relationship (QSAR) derived from these data was log (1/LC10 (mol/L)) = 0.64 log Kow + 4.40 (n = 5; r2 = 0.76; s = 0.24). It showed an apparent higher toxicity compared to the typical QSAR for polar narcosis in water-only systems probably due to the simultaneous exposure of the snail to LAS through the dissolved and the sediment associated fractions. The egestion rate of the surviving snails recovered after few days' exposure (1-d NOEC: 40-107 mg/kg, 9-d NOEC: 65-190 mg/kg) which suggests that the organisms were able to acclimate to LAS during the exposure. 相似文献
99.
Linear alkylbenzene sulfonates (LAS) are anionic surfactants, which are found in relatively high amounts in domestic and industrial wastewaters. The effectiveness of using sonochemical reactor for the degradation of LAS from effluent of wastewater treatment plant has been investigated. In this study, experiments of LAS solution were performed using methylene blue active substances (MBAS) method. The effectiveness of sonochemical reactor for LAS degradation is evaluated with emphasis on the effect of sonication time and initial LAS concentration. Experiments were carried out at initial concentrations of 0.2 mg/L, 0.5 mg/L, 0.8 mg/L and 1 mg/L, frequency of 130 kHz, acoustic power value of 400 W, temperature of 18-20 °C and pH value of 6.8-7. This study showed that LAS degradation was found to increase with increasing sonication time. In addition, as the concentration is increased, the LAS degradation rate decreases in the sonochemical reactor. 相似文献
100.
乾安县LAS数据与未来降水关系的统计检验 总被引:1,自引:0,他引:1
在LAS输出数据的低谷常对应有降水天气出现,为确定这种关系在降水预报中是否有应用价值,对每日中午LAS数据的高值和低值和未来32h晴雨的关系作统计检验。首先根据数据随季节的变化,确定每月高和低的分界线。然后用X^2检验法,检验高值后的晴雨概率和低值后的晴雨概率有否明显区别。检验结果表明,高值和低值之后出现晴雨天气的概率差异显著,各个月得到的统计量X^2的值,全部通过X0.005^2的临界值。 相似文献