我国航空运输服务贸易壁垒的经济效应研究

给出了一个测量航空运输服务贸易壁垒以及自由化后经济效应的可行的方法,这在中国航空运输服务贸易研究方面还是首次。通过研究得出结论：运输服务开放不仅对服务贸易本身贡献极大,而且对货物贸易以及经济增长都有很大的促进作用。运输服务开放后带来的运输服务成本降低可以产生和保护关税的降低一样的效果,运输服务成本降低这种影响之一是货物贸易的数量增加。另外也可以得出运输服务成本和经济增长之间的经济联系,运输成本加倍会使经济年增长率减半。     

科技活动对民航产业结构调整作用的定量分析

在深入分析科技创新对民航产业结构调整的作用途径的基础上,借助计量经济学研究方法,开展科技投入和科技产出对民航产业结构调整作用的量化分析,回答民航科技创新究竟如何并在多大程度上影响着民航产业结构调整这一问题。     

煤矿通风研究

文章讨论了瓦斯煤矿安全生产的通风问题,使用微分方程建模得出局部通风机功率与掘进工作面瓦斯浓度的关系;根据国家《安全煤矿安全规程》确定了各巷道风量的允许范围,以巷道瓦斯浓度与断电浓度之间的差距为目标函数,在考虑了巷道的漏风系数情况下,通过数学规划求出目标函数的最大值,得到理论最优通风量,再引入矿井瓦斯涌出不均衡系数与矿井通风系数对理论结果进行了修正。     

易与空气板线馈电网络结构一体化的天线单元设计

空气板线馈电网络由于具有损耗小、耐功率高、幅相控制容易等特点而广泛应用于平面阵列天线中.天线辐射单元与空气板线馈电网络结构一体化,结构紧凑、集成度高,便于制造和装配,可大大降低成本和周期.文中介绍了两种天线单元形式及仿真结果,给出了一种天线单元及由其组成线阵的试验结果,表明其具有良好的性能,满足实际使用要求.其设计思想具有良好的扩展性.     

A Study of Chinese Government’s Policies in Industrial Pollution Mitigation

I. Introduction The dynamic tension between the quest for higher economic growth and the responsible maintenance of environment quality has fueled many lively debates around the globe. Some experts argue that the decision-makers in industry need to factor in sustainable environmental measures as every bit as important as the bottom line, while some otherscholars have started to wonder whether it is the production techniques or government policy that should be applied to pollution control. It i…     

日本发展循环经济的经验及其对中国的启示

发展循环经济、构建循环型社会是实践"三个代表"重要思想、落实科学发展观、实现可持续发展的重要保证.日本是最早发展循环经济的国家之一,其成功经验值得中国借鉴.由此得到启示,中国应从健全法规体系、完善政策机制、突破技术瓶颈、贯彻"5R"原则、培养全民意识入手来发展循环经济.     

碳酸钾生产中吹脱法除氨的实验研究

碳酸钾生产工艺中,除氨的不彻底一直是困扰厂家的一大难题.本文介绍一种吹脱除氨的新工艺.实验从温度、吹脱时间、吹脱气量、气相压力等方面进行了研究.结果表明,实验条件下,溶液温度、吹脱时间、吹脱气量和气相压力对NH4HCO3分解影响显著.合理的除氨工艺参数为:离子交换液温度343 K;吹脱时间1.5 h;吹脱气量0.1 m3/h;真空度为0.03MPa.     

CENTAC压缩机在空分装置中的应用

压缩机是通用的化工生产设备.本文介绍了CENTAC压缩机的工作原理、结构和运行特性,以及在空分中的应用,并对应用中存在的问题提出了一些改进措施.     

如何防范敏感性商品在空运方式下的信用证风险

在一般贸易中,受某种特定因素的影响,使得某种普通商品由于供求关系发生变化变成敏感性商品。由于该类商品价格受特定的因素和供求关系变化的影响较大,价格极不稳定,容易给买卖双方带来较大利益和损失。本文正是从该类商品在一般贸易中的空运方式和信用证付款条件下,通过具体案例进行分析有哪些风险及其防范措施。     

Australian climate concern and the ‘attitude–behaviour gap’

Anthropogenic climate change poses considerable challenges to all societies and economies. One significant contributor to human-induced climate change is tourism transportation, particularly aviation. This paper addresses the relationship between climate change concerns, the energy-intensive nature of tourist consumption, and unrestrained tourist air travel behaviour in the context of Australia. Following Barr et al. [(2010). “A holiday is a holiday”: Practicing sustainability, home and away. Journal of Transport Geography, 18(3), 474–481], it seeks to understand public climate concern within the context of routine everyday (‘home’) lives and occasional tourist (‘away’) decision-making, with a specific focus on air travel. It draws upon 20 in-depth semi-structured interviews conducted in Australia between March and June 2011. The findings highlight the contradictory nature of environmental concerns and consumption decisions in everyday and tourist contexts. This is evident in widespread domestic consumer practices that are motivated, all or in large part, by climate concerns, set against almost complete disregard and neglect of responsibility to modify existing air travel practices. Our results highlight the magnitude of the challenge involved in shifting deeply entrenched air travel behaviours despite the growing urgency of radical emission reductions. It also highlights the need to consider consumer responses to climate change not in isolation, but in relation to industry drivers and strong government policy interventions.