共查询到20条相似文献,搜索用时 0 毫秒
1.
2.
Cara A.M. BondiAuthor Vitae 《Journal of Cleaner Production》2011,19(5):429-437
Hazardous chemicals are pervasive in household disinfectant products. Many ingredients have established associations with acute and chronic human health conditions as well as with environmental damage. Although these associations are suggested but not proven, they are of great concern. This article describes the application of the precautionary principle to the selection of an anti-microbial active ingredient for a botanical disinfectant when significant uncertainty exists around the hazard and risk of traditional disinfectant active ingredients. We show that application of the precautionary principle does not stifle innovation and facilitates a responsible approach to product development. 相似文献
3.
We study the general relativistic spacetime metrics surrounding massive cosmological objects, such as suns, stars, galaxies or galaxy clusters. The question addressed here is the transition of local, object-related spacetime metrics into the global, cosmological Robertson-Walker metrics. We demonstrate that the answer often quoted for this problem from the literature, the so-called Einstein-Straus vacuole, which connects a static outer Schwarzschild solution with the time-dependent Robertson-Walker universe, is inadequate to describe the local spacetime of a gravitationally bound system. Thus, we derive here an alternative model describing such bound systems by a metrics more closely tied to the fundamental problem of structure formation in the early universe and obtain a multitude of solutions characterising the time-dependence of a local scale parameter. As we can show, a specific solution out of this multitude is able to, as a by-product, surprisingly enough, explain the presently much discussed phenomenon of the PIONEER anomaly. 相似文献
4.
介绍了湿法脱硫系统中真空皮带脱水机滤布的一种光漫反射纠偏装置,包括其主要部件如光漫反射传感器、电动推杆驱动装置、滤布控制滚轮等,重点阐述了光漫反射纠偏装置的工作原理及纠偏过程。光漫反射纠偏装置的主要原理是通过光漫反射传感器的输出信号来判断滤布的跑偏,根据光漫反射传感器的输出信号,DCS控制系统发送指令启动可伸缩的电动推杆装置来伸长和收缩推杆,从而控制滤布滚轮围绕着旋转点进行相应的倾斜调整,使滤布回到其中心位置。 相似文献
5.
近红外光谱技术结合主成分聚类分析判别海面溢油种类 总被引:9,自引:1,他引:9
鉴于目前没有一种方法能独立解决溢油鉴别的所有问题,本文提出了近红外光谱技术结合主成分聚类分析鉴别溢油种类的方法。通过有机溶剂萃取出自行配制的汽油、柴油和润滑油模拟样品中的溢油后记录其近红外光谱,对5800~6200cm-1区段范围内的谱图经多元散射校正(MSC)、Norris一阶导数平滑预处理处理后求其主成分,并在主成分的基础上引入Ward聚类分析法(离差平方和法)对样品分类。结果表明近红外光谱技术结合聚类分析能对体积分数在0.4~0.8mL/L间的海面溢油样品正确、快速分类,近红外光谱技术结合主成分聚类可作为溢油鉴别的一种辅助方法。 相似文献
6.
7.
Wolfgang Priester (1924–2005) was one of Germany’s most versatile and quixotic astrophysicists, reinventing himself successively
as a radio astronomer, space physicist and cosmologist, and making a lasting impact on each field. We focus in this personal
account on his contributions to cosmology, where he will be most remembered for his association with quasars, his promotion
of the idea of a nonsingular “big bounce” at the beginning of the current expansionary phase, and his recognition of the importance
of dark energy (Einstein’s cosmological constant Λ) well before this became the standard paradigm in cosmology.
In memoriam Wolfgang Priester, 22 April 1924 – 9 July 2005 相似文献
8.
Cosmic vacuum energy decay and creation of cosmic matter 总被引:1,自引:0,他引:1
In the more recent literature on cosmological evolutions of the universe, the cosmic vacuum energy has become a nonrenouncable
ingredient. The cosmological constant Λ, first invented by Einstein, but later also rejected by him, presently experiences an astonishing revival. Interestingly
enough, it acts like a constant vacuum energy density would also do. Namely, it has an accelerating action on cosmic dynamics,
without which, as it appears, presently obtained cosmological data cannot be conciliated with theory. As we are going to show
in this review, however, the concept of a constant vacuum energy density is unsatisfactory for very basic reasons because
it would claim for a physical reality that acts upon spacetime and matter dynamics without itself being acted upon by spacetime
or matter. 相似文献
9.
10.
浅谈城市现代化过程中的生态问题 总被引:2,自引:0,他引:2
城市现代化是社会发展的必然要求,是城市化发展的总体趋势,本文提出了城市现代化的概念,并以广州市为例,注重从生态角度上分析了城市现代化进程中存在的生态问题,指出城市现代化建设所必须遵循的生态原则,并给出了广州市目前城市现代化建设应采取的一些生态措施。 相似文献
11.
“一事不再罚”是行政处罚的基本原则之一,在我国,“一事不再罚”原则在《行政处罚法》中有集中体现.本文从我国一事不再罚原则的概念和含义出发,结合环保工作实际,从一事不再罚原则在环保行政处罚中的具体应用方面进行探讨. 相似文献
12.
生态文明校园建设是生态文明建设的微观体现,高校生态文明校园建设是环境保护、和谐校园建设、文明校.园建设、节约型校园建设的需要;生态文明校园建设要坚持美化与绿化、生态与循环、可持续与节约原则;生态文明校园建设方法为加大宣传和教育力度,投入固体废弃物处置设备,建立水处理循环系统,利用太阳能,推行节约措施,使用粪便和垃圾生产沼气等。 相似文献
13.
环境污染责任保险的环境法解释与制度构造 总被引:1,自引:0,他引:1
环境污染责任保险是环境污染损害救济社会化的重要途径和完善环境污染损害救济机制的必由之路。中国环境污染责任保险制度的真正建立和运行,需要运用环境法的基本理念和思想对传统责任保险制度进行重新审视和构造。环境污染责任保险制度设计的关键在于合理贯彻环境法的理论思想,运用风险预防、生态正义之理念,环境污染损害救济、环境权等理论思想进行理论诠释,在保险方式、责任基础、承保范围、赔付范围及赔偿限额等方面构造中国的环境污染责任保险制度,以发挥环境污染责任保险之风险预防、损害救济和稳定社会秩序的功能。 相似文献
14.
15.
16.
微界面水质过程的理论与模式应用 总被引:23,自引:5,他引:23
水体颗粒物群体与水溶液构成微界面体系,共多种表面反应过程决定着天然水的水质,并且为水处理工艺所利用来净化水质。西方综述表面配位理论与模式的进展。主要简要介绍环境消化重点实验室近年来在此领域进行的部分研究工作,藉以反映这一领域中可广泛涉及的环境水质学问题。 相似文献
17.
辐射污染防治地方立法评析 总被引:1,自引:0,他引:1
由于国家立法的缺失,近年来中国的辐射污染防治地方立法十分活跃。将放射性污染防治和电磁辐射污染防治合并,制定综合性的辐射污染防治法已成为地方立法的趋势。两种辐射污染同中有异,在污染特性、危害原理和危害程度上有明显的区别,综合性立法既有必要又具可行性。但现有立法未能反映两种辐射污染防治的根本不同,特别是回避和混淆两种辐射污染的防治原则,确立电磁辐射污染防治适用风险预防原则是当务之亟。 相似文献
18.
大学语文教学是传播文化观念、提高大学生人文素质的主渠道,本文从大学语文教学的内容、模式、原则以及方法等不同角度来探讨如何加强大学语文教学效果,如何在提高大学生母语运用能力的同时,培养其高尚的道德情操和健康的审美情趣. 相似文献
19.
20.
Starting from a theoreticalnotion of capacity building this paperfocuses on the implications ofmulti-project baselines for costs andinstitutions. Availability of data and thelevel of data aggregation determine to alarge extent the cost of derivingmulti-project baselines. For localinstitutions this implies that theircapacity development needs are linked todecisions made on strictness of baselines.The initial higher costs of multi-projectcalculations in the development stage areeasily offset once more projects will usesuch a baseline. This paper argues theseinitial demands are not as high asexpected. Multi-project approaches willreduce transaction costs, especially forsmall-scale projects, will reducevalidation costs and likely reduce humanresource demands in other stages of theproject cycle. 相似文献