The effects of high-speed rail on air passenger transport in China

This study investigates the effects of high-speed rail (HSR) on China’s air passenger transport from the perspective of airports. The difference-in-differences approach is used with unbalanced panel data of 206 airports over the period from 2006 to 2015. Our estimation results found that the negative effects of HSR on the growth rate of China’s air passengers is both statistically and economically significant. However, these adverse effects are not catastrophic.     

关于企业税收流失与涉税人员的关系分析

对企业方面的税收流失与会计人员、企业负责人、税务人员、行政长官及社会监督人员的关系进行分析 ,提出税收流失重点在于预防 ,关键在于提高全体社会成员的税收意识 ,最终实现税收流失的源泉控制。     

一种多传感器空情信息融合算法

针对防空指挥系统快速反应决策能力要求,给出了可行的系统信息融合处理软件组成结构及功能描述,提出了一种适用于快速空情信息融合的通用信息融合处理方法和模型算法。建模过程中,提出的信息融合处理方法和模型算法将防空指挥系统信息融合的复杂过程条理化、公式化和数字化。仿真结果证明,该方法是正确和有效的。目前,该方法已应用到实际工程中。     

码分无线射频识别系统空中接口协议设计及性能分析

为进一步提高无线射频识别系统单个读写器识别电子标签的速率,设计了一种将码分与统计时分技术相结合的新型无线射频识别系统的空中接口协议,并分析了系统的抗噪声性能、识别速率等主要性能指标。仿真结果表明,新型无线射频识别系统在抗噪声性能和识别速率等方面均优于基于现有国际标准ISO/IEC 18000-6C的无线射频识别系统。     

Economic contribution of essential air service flights on small and remote communities

The Essential Air Service Program (EAS) has attracted considerable criticism and has been a target for either modification or complete termination almost since its inception through the Airline Deregulation Act in 1978. Although its opponents emphasize the program's inefficiency, its supporters claim that the program is crucial to accessing small and remote communities, which helps them develop economically and socially. This paper demonstrates the economic contributions of EAS flights to small and remote communities. Using a two-stage least squares estimation, the major findings indicate that a 1% increase in air passenger traffic in EAS airports with a minimum annual air passenger traffic of 1000 likely leads to a 0.12% increase in per capita income of the community served by that airport. Our results also suggest that EAS communities that are able to sustain their subsidized flights experienced higher per capita income growth in the 1999–2011 period than did ex-EAS communities that lost their flights as a result of non-eligibility.     

关于美国战争费用的启示

本文以本次局部战争为案例,根据目前披露出来的一些数据进行初步的分析,希望能够为我们了解美国战争费用的总体情况提供参考。     

基于温差发电的混合动力自行车的研究

本文主要研究了一种基于温差发电的混合动力自行车,并就其改装和发动机尾气余热利用的系统优化设计进行了集中分析,最终得出了相关结论。     

Natural and anthropogenic influences on the year-round temperature dynamics of air and water in Postojna show cave,Slovenia

Air and groundwater temperatures were measured in a rimstone pool in Postojna Cave, to advise evaluation of the impact of natural and anthropogenic influences related to heat being initially transmitted into cave air by visitors. Such heat can accumulate both in the rock mass and in water. Results show that attention must be paid to temperature changes of rimstone pool water rather than those of cave air, especially during the winter. Thanks to good ventilation deep inside the cave, short-term air temperature increases related to higher visitor numbers have not influenced flowstone precipitation or the cave fauna. However, this situation might change if winter visitor numbers increased greatly. This study does not support a suggested increase in winter visits (currently the tourism low-season) and reduction of summer visits (currently the tourism high-season).     

Media heterogeneity and post‐earnings announcement drift: evidence from China

This paper examines how the Chinese stock market acts differently towards state‐controlled and market‐oriented media coverage. Using a setting of post‐earnings announcement drift, we find that information from state‐controlled media enters the stock price in a timelier manner, while the message from market‐oriented media needs more time to get a response from investors. The effect is also influenced by whether the type of news coverage is good or bad. Our findings suggest that the capital market underreacts when good news is reported by the market‐oriented media.     

Measuring imported case risk of COVID-19 from inbound international flights --- A case study on China

With COVID-19 spreading around the world, many countries are exposed to the imported case risk from inbound international flights. Several governments issued restrictions on inbound flights to mitigate such risk. But with the pandemic controlled in many countries, some decide to reopen the economy by relaxing the international air travel bans. As the virus has still been prevailing in many regions, this relaxation raises the alarm to import overseas cases and results in the revival of local pandemic. This study proposes a risk index to measure one country's imported case risk from inbound international flights. The index combines both daily dynamic international air connectivity data and the updated global COVID-19 data. It can measure the risk at the country, province and even specific route level. The proposed index was applied to China, which is the first country to experience and control COVID-19 pandemic while later becoming exposed to high imported case risk after the epidemic centers switched to Europe and the US afterward. The calculated risk indexes for each Chinese province or region show both spatial and temporal patterns from January to April 2020. It is found that China's strict restriction on inbound flights since March 26 was very effective to cut the imported case risk by half than doing nothing. But the overall index level kept rising because of the deteriorating pandemic conditions around the world. Hong Kong and Taiwan are the regions facing the highest imported case risk due to their superior international air connectivity and looser restriction on inbound flights. Shandong Province had the highest risk in February and early March due to its well-developed air connectivity with South Korea and Japan when the pandemic peaked in these two countries. Since mid-March, the imported case risk from Europe and the US dramatically increased. Last, we discuss policy implications for the relevant stakeholders to use our index to dynamically adjust the international air travel restrictions. This risk index can also be applied to other contexts and countries to relax restrictions on particular low-risk routes while still restricting the high-risk ones. This would balance the essential air travels need and the requirement to minimize the imported case risk.