SeMS and sensibility: Security management systems and the management of risk in the Canadian Air Transport Security Authority

Following International Air Transportation Association requirement for all member airlines and airports to have a security management system (SeMS) beginning 1 March 2007, many organizations are looking to learn from safety and quality management systems. Without specific guidelines or best practices, organizations are forced to imitate these processes designed for different goals. Since safety, quality, and security environments operate on radically different principles, SeMS implementation must take a different tack. The case of the Canadian Air Transport Security Authority illustrates the importance of a custom-designed program that meets public and corporate needs. The Authority is responsible for security screening of passengers, non-passengers, and baggage within selected airports. As a crown corporation with a precise statutory mandate and regulatory environment, the development of a SeMS illustrates some of the key problems for the application of SeMS to larger organizations.     

我国外国航空运输业营业税征管现状与思考

本文以北京市地方税务局涉外税务分局所管辖的外国航空运输公司为例,从税收协定和税收政策方面分析我国税务机关在对外国航空运输业营业税征管中存在的问题,并针对问题提出建议。     

Variations in hub service in the US domestic air transportation network

This paper looks at the various types of hubs that have evolved in the air transportation network in the USA. Since deregulation of the industry at the end of the 1970s, the major air carriers have expanded their networks to become more competitive, and the number and types of hubs have grown accordingly. A connectivity analysis using a traditional matrix approach is used to derive indices which are the basis for the development of a connectivity classification scheme. In addition, the various service functions of hubs are explored.     

Explaining changes and trends in the airline industry: Economies of density,multiproduct scale,and spatial scope

Changes in the shape and size of airline networks have not been explained clearly from a cost perspective based on the finding of increasing returns to density for given route structures and constant returns to scale for variable network size. We reassessed the estimates of these economies by using new scale and scope indices, finding savings due to changes in route structures and various types of economies of spatial scope not previously calculated: network size, trunk-local services and domestic-international services. Results contribute new insights on the role of cost incentives in the observed changes and trends in the airline industry.     

长三角地区房间空调器冬季制热性能的实验研究

通过对冬季制热性能的实验研究，得出了室内外热力参数随时间变化的规律。实验结果表明，充分利用太阳能的热量，可使耗电量降低10．6％，房间温度升高2．4℃，节能效果非常明显。各地区建筑节能的发展方向对于新旧建筑物应区分对待。     

灯泡贯流式水轮发电机组冷却方式研究

文章针对国产灯泡贯流机组冷却方式在设计、运行过程中存在的问题，提出了技术改造方案和处理意见，供同行研究参考。     

Factors influencing cargo airlines’ choice of airport: An international survey

This paper identifies and evaluates the myriad of factors that influence the choice of airport by freighter-operating airlines. The findings are presented from an international postal survey of airlines operating freighter aircraft on a scheduled non-integrated basis. A number of factors such as night curfews, freight forwarders and airport charges are found to be influential and these are examined against a number of dependent variables such as the airline's home region and operational patterns in order to identify key variations.     

Locational determinants of major US air passenger markets by metropolitan area

The paper examines the influence of metropolitan characteristics in determining the locations of major air traffic markets in the US. In general, the likelihood of a major air passenger market locating in any given metropolitan area is primarily determined by the metropolitan area's population size and overall propensity for air travel. The study shows that on average, a major air passenger market has over 3 million people while a minor market has a population base of about 760,000. The propensity of a population to fly is mainly a function of a number of social and economic indicators, the most important of which was found to be employment in professional–scientific–technical services and management activities.     

洁净室安装刍议

介绍了洁净室工程出现的原因,阐述了洁净室的施工安装过程;壁板安装与其他专业的配合,以及各种类型地面的施工过程;洁净风管的制作和安装;洁净室对水、气、电等公用动力专业的要求。介绍了中国目前的洁净室市场情况。     

Effectiveness of air pollution standards in reducing mortality in India

India experiences some of the highest air pollution levels globally, with 13 of the 20 most polluted cities in the world. In this paper, we estimate the relationship between air pollution policies in India and mortality for people of all ages and all causes. We estimate the relationship between mortality and two major air pollution regulations, the Supreme Court Action Plan (SCAP) and the Catalytic Converter (CC) policy. Although data for mortality in India have improved over time, the annual average mortality for many districts is volatile, with many outliers and missing values. After addressing these measurement issues in a difference-in-differences setup, we do not find evidence that the policies were effective in significantly reducing mortality. In an effort to understand the potential benefits of reducing pollution levels in India, we investigate the association of different pollution types with mortality. This analysis relies upon relatively recent satellite data on PM_2.5 levels in India. We examine this relationship for India for the first time, using a fixed effects model in an attempt to address issues of endogeneity and measurement error. We find that PM_2.5 levels are positively associated with mortality, with a 10% increase in pollution conditionally associated with a 2.0% increase in the mortality rate.