人造卫星捕捉污染物的全球迁移(上)

在20世纪中期,高耸的烟囱是解决工业废气排放的常见方法.把废气泵到足够高的空中,便想当然地认为污染问题也随之解决了.然而,随后的许多研究却强有力地显示高大烟囱不足以减轻污染的影响,那些高耸的大烟囱排放的污染物最终还是会回到地面,当然可能是到达几十里或数千里以外的其它地方.     

The industrial athlete?

Many similarities can be drawn between the athletic and industrial population. It is time for a shift in the approach toward injured workers utilizing a sports medicine perspective. We must think of workers as industrial athletes and recognize that the sports medicine model can be appropriately adapted to the injured worker. This model includes prevention, early intervention/identification, training and conditioning, and progressive treatment. Sports medicine rehabilitation concepts include treating the entire kinetic chain that is associated with a specific injury and the SAID principle (Specific Adaptations to Imposed Demands).     

Quality of Life Indexes for National Policy: Review and Agenda for Research

A number of governments and public policy institutes have developed Quality of Life Indexes – statistics that attempt to measure the quality of life for entire states or regions. We develop 14 criteria for determining the validity and usefulness of such QOL indexes to public policy. We then review 22 of the most-used QOL indexes from around the world. We conclude that many of the indexes are successful in that they are reliable, have established time series measures, and can be disaggregated to study subpopulations. However, many fall short in four areas: (1) indexes vary greatly in their coverage and definitions of domains of QOL, (2) none of the indexes distinguish among the concepts of input, throughput, and output that are used by public policy analysts, (3) they fail to show how QOL outputs are sensitive to public policy inputs, and (4) none have examined convergent validity against each other. We conclude that many of these indexes are potentially very useful for public policy and recommend research to further improve them.     

The Second Approximation to an International Standard for Life Satisfaction

An earlier study, based on data from Western countries, concluded that an international standard for life satisfaction could be stated as 75 ± 2.5 percentage of the measurement scale maximum score. This study presents a similar analysis based on data from countries representing all major geographic regions. It is reported that these data yield a more inclusive standard of 70 ± 5 percentage of scale maximum. While the major correlates of life satisfaction are found to be individualism and national wealth, the life satisfaction levels of some countries are distinctly anomalous in this regard. It is concluded that the narrow range of population data suggest that life satisfaction is held under homeostatic control. The anomalous levels of life satisfaction reported by some countries indicate caution in the interpretation of life satisfaction data as implying some desirable population state.     

Public Research, Private Concerns: ethical issues in the use of open-ended interviews with people who have learning difficulties

This paper is an exploration of the ethical dilemmas in open-ended interview research with people with learning difficulties. We address the possibility that research which gives voice to the experience of abuse, from the viewpoint of the victim, can itself be abusive. Such research is justified in terms of empowering, illuminating and disseminating the meaning that participants give to their lives. Yet every stage of the process raises complex ethical issues when research participants are drawn from vulnerable and powerless groups in society, and the focus for investigation can be deemed private. As a vehicle for our exploration, we reflect on our ethical dilemmas in researching the story of a young woman who has learning difficulties and has been the victim of various forms of abuse. We argue that ethical dilemmas cannot be overcome solely by Ethical Codes or even predetermined 'good practice'. They are integral to the whole research process and necessitate continuous explicit examination of decision making processes within research.     

Exposure Assessment of TSEs from the Landspreading of Meat and Bone Meal

Recent changes in European legislation have meant that certain processed abattoir waste, which has been appropriately heat treated and ground to a specified particle size, can be spread on nonpasture agricultural land. This has opened the way for the potential landspreading of mammalian meat and bone meal (mMBM) derived from animals slaughtered for human consumption. This article reports on two separate case studies (Study 1 carried out in Great Britain (GB) and Study 2 carried out in Ireland) on the potential exposure to TSE infectivity following the spreading of abattoir waste (derived from animals slaughtered for human consumption) on nonpasture agricultural land. For Study 1, the average TSE infectivity on nonpasture agricultural land per year from sheep with scrapie was found to be higher (five orders of magnitude) than that estimated for BSE in cattle (3.9 x 10(-3) Ovine Oral ID(50)/ton of soil compared to 3.3 x 10(-8) Bovine Oral ID(50)/ton of soil). The mean estimate for BSE in sheep was 8.1 x 10(-6) Ovine Oral ID(50)/ton of soil. The mean level of infectivity in mMBM was assessed to be 1.2 x 10(-5) and 2.36 x 10(-5) ID(50)/ton of mMBM for Study 1 and 2, respectively. For Study 2 the spreading of mMBM was estimated to result in infectivity on nonpasture land of 1.62 x 10(-8) Bovine Oral ID(50)/m(3). The mean simulated probability of infection per year per bovine animal was 1.11 x 10(-9). Given the low infectivity density and corresponding low risks to bovines the spreading of mMBM could be considered a viable alternative for the utilization of mMBM.