浅谈降低采购成本的有效途径——包装材料的回收及再利用

包装的回收再利用属于公司逆向物流的一部分,通过包装材料的回收及再利用能有效降低公司的采购成本。本文简单介绍包装产品的回收、检测、再利用措施决策等回收再利用三大步骤,并进一步探讨了包装产品在企业的回收再利用系统的建立和其带来的经济、社会和环境效益,最后又阐述了包装回收再利用系统的运作主体选择。     

博弈论在政府引导企业实施回收逆向物流中的应用

为了追求最大利润的经营目标,企业不愿意为实施回收逆向物流付出成本,政府作为宏观调控部门,有必要对其加以引导。本文采用博弈论的方法,对企业与政府在实施回收逆向物流这一方面进行了分析,并提出了引导企业实施回收逆向物流的最优策略。     

一种大中型企业电能集中检测系统的电路原理

在大中型企业电能检测与调度是很重要的一项工作。本文着重介绍了电能自动检测系统的电路原理 ,该系统运行可靠 ,可节省大量人力和物力。     

跨座式单轨构架焊缝疲劳分析方法研究

构架是跨座式单轨车辆的承载基础,其焊接结构的强度与可靠性事关车辆运行安全.跨座式单轨车辆运行期间构架受到轨道梁路面的激励以及指形板的冲击.为提高构架焊缝结构疲劳计算精度,本文考虑构架自身结构固有动态特性对疲劳性能的影响,建立了一套的疲劳计算分析方法.     

Does Psychological Contract Violation Moderate the Impact of Severity and Recovery Satisfaction on Boycott? An Analysis of Halal Violation

Halal violation is a critical issue in the Islamic market, but little is known on its impact on the Muslim consumer. Thus, this study investigates the effect of psychological contract violation (PCV), recovery satisfaction, and severity of halal violation on product boycott. The moderating role of PCV in the relationship between recovery satisfaction and seriousness of a violation on the product boycott is also examined. Data collected from a sample of 360 customers were analyzed using PLS-SEM. The results show that recovery satisfaction, severity, and PCV significantly influence product boycott and PCV significantly moderates the relationship between recovery satisfaction and product boycott. This study provides new insights into the relationships among recovery satisfaction, the severity of the halal violation, psychological contract violation, and product boycott and helps the managers to design recovery action toward halal violation.     

Exploring guest response towards service failure in home-sharing: service presence and consumption motivation

The present study leverages the tenets of social presence theory (SPT) and attribution theory to demonstrate a service presence effect on guests’ behavioral responses toward home-sharing platforms following a service failure. Results indicate that in the case of a typical, controllable service failure, guests with a hedonic motivation have a higher tendency to complain and switch out of the home-sharing platform when the service contact is a hotel representative (vs. a private host), and this effect is mediated by levels of fault attributed to the home-sharing platform. However, guests with a utilitarian motivation respond to service failure equally across types of service contacts. For uncontrollable service failures, the service presence effect holds true across consumption motivations and is explained by fault attribution. The study is the first comprehensive inquiry into service failure in the home-sharing context and has important implications for theory and businesses competing in this space.     

Recovering from demand disruptions on an air cargo network

In this work we introduce the Air Cargo Schedule Recovery Problem (ACSRP). In this problem, a carrier airline has to reschedule flights and requests to adapt to last-minute demand changes. We consider three different possible crew management policies that translate into three different way to evaluate the costs of deviating from the original schedule. We formulated the ACSRP as a mixed integer linear programming problem, and tested our implementation on 24 original schedules with up to 30 orders and 8 airports, and 4 different disruption scenarios for each one. Our results show that, against a benchmark recovery policy where only cargo is re-routed, recovery can yield savings of roughly 10%.     

Hub airport slot Re-allocation and subsidy policy to speed up air traffic recovery amid COVID-19 pandemic --- case on the Chinese airline market

With international air travels largely banned around the world amid the global COVID-19 pandemic, many gateway and hub airports have more ideal slots available for reallocation. Airport traffic recovery replaces airport congestion to become the primary challenge of major airports around the world. With the pandemic well controlled domestically in China, the government liberalizes the hub airport slots for those previously forbidden services to the small/regional airports. This paper thus analytically examines the effect of this slot liberalization. The government subsidy to the small airports has also been considered. It is found that the slot liberalization can speed up airport traffic recovery for both hub and small airports. The hub airport slot liberalization leads to a lower level of minimum subsidy to sustain the survival of the small airports. Given any fixed level of subsidy to the small airport, both the total airport traffic and social welfare would improve with the slot liberalization at the hub airport. When the government can adjust the level of subsidy after liberalizing the hub airport slots, the subsidy could be excessive, if the government emphasizes too much on airport traffic recovery. This would, however, harm the overall social welfare.     

一种16倍采样的Gardner定时同步方法

DVB-S2X(The second generation Digital Video Broadcasting by Satellite Extensions)标准给出了高至256阶的APSK(Amplitude Phase Shift Keying)调制方式，对解调端的符号定时同步、帧同步和载波恢复都提出了更高的要求。结合DVB-S2X技术手册的建议，在经典的基于4倍符号速率采样的Gardner定时同步的基础上，提出了一种在定时同步环路前端加预滤波器并将原来的单路插值扩展到4路插值的基于16倍采样的同步方法。介绍了该方法的思想和结构并进行了仿真实验，结果表明该方法相比于经典Gardner方法有更好的误码性能，在高阶调制的情况下表现尤为突出。     

The Ottoman dissolution and the İstanbul bourse between war and peace: a foreign exchange market perspective on the Great War

The participation of the Ottoman Empire in the First World War caused economic disruptions, huge budget deficits, surmounted inflation rates and excessive depreciation of Lira, the Ottoman currency. Based on the value of Lira against the currencies of Switzerland, Netherlands, Sweden that were not in the war, we focus on the effects of news about the war on the foreign exchange rates at the ?stanbul bourse from 1918 to 1919. Our results signify some dates, which match the announcements of the armistices and peace meetings, heralding continuous depreciation of Lira. Thus, the findings support the presence of an expectation on the dissolution of the Ottoman Empire with the peace, marked by the escalation of the loss in trust for the Lira and the power of the state in foreign exchange interventions.