原油计量体积交油的探讨

通过对国内外原油贸易计量的现状研究，分析我国目前原油贸易计量技术与国际惯例之间存在的差距；对我国原油计量同国际接轨的有关方法、标准和技术进行探讨；指出，原油计量体积交油同国际接轨是必要的和可行的。     

一种新的通用航空机载防撞逻辑设计方法

由于机载防撞系统(TCAS)是针对具有较大垂直高度变化率的大型飞机设计的，系统设定条件和与之相关的解脱建议并不能适用于通航飞机。针对通用航空的防撞问题，提出了一种基于马尔可夫决策过程(MDP)的防撞逻辑设计方法。首先，将飞机空中相遇过程的动态模型转换为离散转移函数；然后，基于防撞系统结果事件末端效用函数进行MDP建模，采用动态规划方法导出了最优防撞逻辑的迭代方程；最后，给出了通航飞机最优化防撞逻辑的设计流程并对最优防撞逻辑进行了计算机仿真。仿真结果表明，通过调整效用比参数可以在保证安全性能的同时有效降低系统告警率。在垂直相遇高度小于30 m的相遇过程占比高达18〖WT《Times New Roman》〗%〖WTBZ〗的情况下，当告警率大于0.85时系统的碰撞概率仅为2.88×10-4左右。该设计方法对我国在低空空域通用飞机防撞系统的研究具有一定的参考价值。     

多维邻近性对航空制造业产业集群协同创新的影响——以江西省为例

基于邻近性的视角，以2008—2019年江西省航空制造业产业集群产学研联合申请的专利数据为例，利用负二项回归方法，探究地理、组织和技术邻近以及各邻近性之间的交互作用对航空制造业产业集群协同创新的影响。研究结果表明：地理邻近和组织邻近对产业集群协同创新产生促进作用；技术邻近对产业集群协同创新产生负向影响；地理邻近正向调节组织邻近同产业集群协同创新之间的关系，地理邻近负向调节技术邻近同产业集群协同创新之间的关系。     

Booking and flying with low‐cost airlines

The first part of the paper develops a theoretical framework for the analysis of strategic behaviour of European low‐cost airlines that emphasises the role of product differentiation. The second part uses original survey data to assess the effectiveness of low‐cost airlines' distribution strategies. Finally, an econometric model is developed to assess the joint impact of the factors affecting the level of the fares charged by low‐cost airlines. The evidence suggests that, among other things, the highest prices normally are paid for tickets bought between 30 and 8 days before departure, and thus indicates an original pricing strategy that differentiates low‐cost airlines from traditional carriers. Copyright © 2002 John Wiley & Sons, Ltd.     

Z28 80A型滚丝机液压系统的改造

Ｚ２８ ８０Ａ型滚丝机的液压系统采用节流调速方式，系统功率损失大，传动速度不稳定；采用容积节流调速方式，并在系统中加装压力补偿器，则系统速度稳定性好，且有明显的节能效果     

Animal Behavior in Capital markets: Herding formation dynamics,trading volume,and the role of COVID-19 pandemic

This paper provides new evidence on herding behavior. Using daily frequency data for 336 US listed firms over a five-year period, we investigate three important elements of financial herding behavior. First, trading volume, representing market interest, as a significant variable in capital markets apart from stock prices. Second, herding dynamics since herding formation is a dynamic process. Third, the reaction of possible financial herding to exogenous events-threats, as we use the pandemic event in order to investigate a market under stress. Even though the benchmark herding model used does not provide evidence of herding behavior, our results verify the significance of the above herding elements. We also find that trading volume and positive changes in trading volume result in increased cross-sectional absolute deviation (CSAD). Most importantly, we find that herding behavior is evident during the COVID-19 pandemic confirming that investors tend to herd during major crisis periods.     

Convertible bond issuance volume,capital structure,and firm value

We investigate whether convertible bond (CB) issuance volume that causes capital structure change would affect firm value. We focus on either the hand-collected data due to multiple CB issues or diverse CB issuance volume (CB-IV) measures, including CB-IV over debt, equity, and assets. We reveal that the firms with higher CB-IV would enhance firm value, somewhat different from previous findings that CB might not be a cheap financing instrument for raising funds. We infer that because increased CB-IV might not be easily permitted by Taiwan authorities, enterprises might endeavor to exploit profits by using the funds raised by CBs. We argue that, to our understanding, our explored issues are essential for enterprises because they link CB-IV and firm value through the capital structure channel. Given that these issues have rarely been a comprehensive focus, this study may contribute to the existing literature.     

When bigger is better: Investment volume drivers in infrastructure public-private partnership projects

This research studies the factors that favour the establishment of high-investment infrastructure public-private partnership (PPP) projects. We analyse 9121 PPPs, hosted in 107 developing countries, in the period 1997–2017. We find that PPP projects adopting contractual forms in which the private party takes more risks, awarded through competitive methods and benefitting from indirect government support programmes, are characterized by a larger investment volume. A more business-friendly economy and robust institutions configure the most conducive environment to establish larger investment PPPs. Furthermore, multilateral development banks’ support of the projects relates positively to their investment volume.     

基于博弈论组合赋权的通航机场短途运输服务质量评价

为评价国内通用航空短途运输的服务质量，建立了总共六个维度、二十四个指标服务质量评价体系并发放问卷对某一通航机场进行服务质量调查。采用博弈论组合赋权的方法对指标进行赋权兼顾主观权重与客观权重，运用模糊综合评价的方法找到某些维度评分不高的问题及原因，针对具体问题给出相关建议，对于提高通用航空服务质量与促进通航发展具有一定的理论及现实意义。     

Return–volume nexus in financial markets: A survey of research

This paper provides a systematic review of the return–volume literature, broadly defined to include theoretical and empirical research relating to the intramarket and cross-market interlinkages between security return and trading volume characteristics in four financial markets, namely, the stock, bond, foreign exchange, and futures markets. Viewed through this lens, this paper attempts to review previous empirical research within a unified theoretical framework that relates the interlinkages between return and volume characteristics in various financial markets. Overall, this paper marks several interesting areas of debate and controversy based on several controversial theories and empirical findings in the literature, suggesting directions for future research.