共查询到20条相似文献,搜索用时 250 毫秒
1.
1957年8月,北京原华北农业科学研究所棉作室在原有的基础上,扩建成立了中国农业科学院棉花研究所(以下简称中棉所),1958年3月中棉所搬迁到河南省安阳县白壁镇。自此,中棉所的协同创新拉开了帷幕. 相似文献
2.
重庆市环境科研监测所20年历程徐渝(重庆市环境科研监测所,重庆630020)概述重庆市环境科研监测所于1976年4月经四川省政府批准建立,至今已20周年。建所初期,任务艰巨,条件艰苦。一批环科所的创业人在重庆市环境保护局的领导和支持下,艰苦创业,科学... 相似文献
3.
4.
5.
罗尔斯顿坚持机体哲学的观点,即价值本身是某种自然资料所形成的。其属性是由自然创造的,而非人所给予的。自然资料所形成的价值是第一性的,属于自然价值。它是人意识判断的基础。由于自然资料被生态系统本身所承载,它也就是一种客观价值。 相似文献
6.
7.
冷轧变形热及温升研究 总被引:1,自引:0,他引:1
推导了冷轧变形热计算公式及变形热所引起的轧件温升计算公式,并应用所推导出的公式计算了铝箔轧制时的温升。采用了刚粘塑性材料模型,考虑了温升所引起的软化效应。 相似文献
8.
西方媒体所描述的中国,远非我们这些居住在中国的外国人所目睹的真实的中国,在分享着这个不可思议的、充满活力的国家所呈现的喜悦和进步的同时,我们不得不被她的魅力深深吸引。 相似文献
9.
10.
11.
Environmentally benign carbon dioxide offers significant potential in its supercritical fluid phase to replace current reliance on a range of hazardous,relatively expensive and environmentally damaging organic solvents that are used on an extensive global basis.The unique combination of the physical properties of supercritical fluids are being exploited and further researched to continue the development and establishment of high efficiency,compact plant to provide energy and water efficient manufacturing processes.This mini-review is focused on the use and potential applications of supercritical fluid carbon dioxide for a selected range of key and emerging industrial processes as a sustainable alternative to totally eliminate or greatly reduce the requirement of numerous conventional organic solvents.Examples of the industries include:chemical extraction and purification,synthetic chemical reactions including polymerization and inorganic catalytic processes.Biochemical reactions involving enzymes,particle size engineering,textile dyeing and advanced material manufacture provide further illustrations of vital industrial activities where supercritical fluid technology processes are being implemented or developed.Some aspects relating to the economics of sustainable supercritical fluid carbon dioxide processes are also considered. 相似文献
12.
13.
14.
超临界态二氧化碳再生活性炭法治理甲苯废气 总被引:14,自引:0,他引:14
制鞋业产生的含甲苯、苯和二甲苯废气的治理大多采用活性炭吸附法。该课题提出以压缩二氧化碳为脱附剂,采用超临界流体萃取技术再生活性炭及回收甲苯工艺。实验表明,以液态或超临界态的压缩二氧化碳作萃取剂,采用萃取法可完全再生活性炭,其采用液态优于超临界态;压缩二氧化碳对活性炭具有扩孔作用,可增加活性炭的吸附容量,多次再生的活性炭吸附容量几乎不变;萃取剂的用量和密度显著影响着活性炭的再生效率;活性炭捆包填充在脱附塔中,不会显著增加脱附的阻力。 相似文献
15.
超临界CO2萃取再生活性炭技术研究进展 总被引:5,自引:0,他引:5
超临界流体由于密度大、粘度低、表面张力小,是再生活性炭的理想溶剂,文章介绍了超临界CO2萃取再生活性炭的原理,研究现状,设备和工艺流程及对该工艺的影响因素,表明了该技术在活性炭再生上的特点,优势及应用前景。 相似文献
16.
17.
18.
19.
Dyeing fabrics in supercritical carbon dioxide (SCD) instead of water can save energy, reduce water use and prevent pollution. The special pilot plant was designed to test dyeing procedures in supercritical carbon dioxide and the analyses of the results indicate major benefits as compared to water based procedures. The dyeing of polyethylene terephthalate (PET) fabric in supercritical carbon dioxide using special pilot plant was investigated. Disperse dye, C.I. (color index) Disperse Blue 79, was used in this study. After dyeing, rinsing in supercritical carbon dioxide, which removes the excess dyes, was also discussed. At the same dyeing conditions, K/S (color yield) of dyed fabric significantly increased with increasing the dye concentration from 1% o.w.f. (on weight of fabric) to 5% o.w.f. Dyeing temperature and pressure had a strong influence on the color yield. When the temperature rose above 110 °C, the increase in color yield was obvious. At 20 MPa, 120–130 °C, dyeing reached equilibrium after 60 min. The excess dye of the dyed PET fabric was small. The suitable condition in supercritical carbon dioxide for removal of excess dye from the dyed fabric was 70 °C, 20 MPa. The PET fabric dyed in supercritical carbon dioxide had good fastness and physical properties. 相似文献
20.
超临界流体萃取技术在我国有机污染分析中的应用 总被引:6,自引:0,他引:6
超临界流体萃取技术依靠超临界流体独特的物理化学性质,具有快速、高效、不使用或少量使用有毒溶剂、自动化程度高等特点。由于它优于传统的索氏提取法和液—液萃取法等,不仅在萃取土壤、粮食等固体样品中的有机污染物发挥了卓越的作用,而且还可以萃取固体吸附剂所富集的水质或空气中的有机化合物而进一步扩大了应用范围,因而在环境有机污染物分析领域得到了广泛的重视和应用。 相似文献