BDSK8广播电离层模型性能分析

对于双频接收机,用户可以采用消电离层组合进行电离层延迟改正,但对于单频导航定位用户而言,此方法并不适用。目前GPSK8模型已在全球覆盖,并且取得了较高的精度。现阶段BDSK8模型已经实现了区域服务,为了更全面地评估BDSK8广播电离层的性能,文章利用实测数据对BDSK8模型按区域和全球进行划分,从改正精度和改正率两方面进行分析。研究结果可为广播电离层监测评估以及单频导航定位等应用提供参考。     

应用皮肤光毒性实验仪进行化妆品皮肤光毒性试验的研究

[目的]探讨应用皮肤光毒性实验仪进行化妆品皮肤光毒性试验的试验条件和阳性对照物8-MOP的合适试验浓度。[方法]观测皮肤光毒性实验仪的UVA光强度与开机时间的关系,并根据测得的光强度平均值计算得出光毒性试验所需的照射时间;用不同浓度的8-MOP进行试验,排除8-MOP的原发性刺激作用,选择适宜的应用浓度进行皮肤光毒性试验;对两个防晒粉底按所选仪器条件进行试验。[结果]照射开始后2-100m in,UVA光强度稳定在4.3-4.4 mW/cm^2,平均值为4.4 mW/cm^2,故试验时的照射时间为38m in;用皮肤光毒性实验仪进行光毒性试验,0.05%8-MOP能引起豚鼠皮肤明显光毒性反应并且不引起原发性刺激反应;相同试验条件下未见两种防晒粉底引起豚鼠皮肤显著光毒性反应。[结论]用皮肤光毒性实验仪进行化妆品皮肤光毒性试验可行、有效。     

The European Union Endorsement Process for International Financial Reporting Standards: A Telos-Based Analysis

The paper discusses the process for the endorsement of an IFRS in the European Union with regard to its compliance with teleological principles and with regard to the true and fair view. It begins with an exposition of the teleological principle under Roman law and its relationship to the true and fair view override, as known in the UK and in the EU. We then discuss firstly the telos-based criteria against which a new Standard is appraised during the endorsement process, and secondly the application of the true and fair view principle to the issue of which criteria an EU-endorsed IFRS should be appraised against as regards its application, using IFRS 3 as a specific illustration. The teleological principle is a crucial element in our conclusions. We show that this principle can be used, and in the EU is being used, to bypass democratic processes. The issues raised by this paper concern the operation of regulations designed to be, at least theoretically, context-neutral, within a specific legal and operational framework, that is, the European Union. But similar issues are likely to require consideration in other geographical areas, outside the European context.     

The condition of the Turking class: Are online employers fair and honest?

Critics of online labor markets claim that employer abuses are endemic in these markets. Surveying a sample of workers, I find that, on average, workers perceive online employers to be slightly fairer and more honest than offline employers.     

Entrepreneurs and the context of cooperative organizations: A definition of cooperative entrepreneur

We focus on the role of entrepreneurs in organizations that are structured as cooperatives. In considering the similarities and differences among various forms of entrepreneurship, a comprehensive definition of the cooperative entrepreneur is formulated. A model illustrating four variations in the manner in which cooperative entrepreneurship contributes to the creation of cooperatives is also presented. These contributions help to more clearly frame future research and lend visibility to the challenges faced by entrepreneurs in the cooperative context. Copyright © 2013 ASAC. Published by John Wiley & Sons, Ltd.     

XBRL for Financial Reporting: Evidence on Italian GAAP versus IFRS

The systematic adoption of the eXtensible Business Reporting Language (XBRL) for financial reporting represents a great challenge. Worldwide, a large number of regulators are making an effort to promote the adoption of this standard to simplify and enhance the communication of financial information. This requires the definition of well‐structured taxonomies that can standardize and accommodate the content of financial reports prepared by firms. This study aims to analyze the regulator‐led adoption of XBRL for financial reporting. It examines the XBRL taxonomies used by Italian firms to reflect their financial reporting under rule‐based Italian GAAP and principles‐based International Financial Reporting Standards (IFRS). We compare the alignment of the Italian GAAP taxonomy and the IFRS taxonomy with Italian companies' financial statements and find two different levels of fit. The results offer useful insights for regulators and policy makers in prescribing or establishing appropriate taxonomies. We illustrate the potential impacts of the different taxonomies on the quality of financial reporting in terms of comparability and potential loss of information.     

Information-based trade

We study the possibility of trade for purely informational reasons. We depart from previous analyses (e.g. Grossman and Stiglitz (1980) [22] and Milgrom and Stokey (1982) [32]) by allowing the final payoff of the asset being traded to depend on an action taken by its eventual owner. We characterize conditions under which equilibria with trade exist.     

Optimal learning and new technology bubbles

It is widely believed that there is a fundamental linkage between major technological innovations, speculative fever, and wasteful overinvestment. This paper presents an equilibrium model of investment in a new industry, whose return-to-scale is not known in advance. Overinvestment relative to the full-information case is then optimal as the most efficient way to learn about the new technology. Moreover, the initial overinvestment is accompanied by apparently inflated stock prices and apparently negative expected excess returns in the new industry, which are also fully rational. This suggests a new interpretation of what seems to be stock market driven real bubbles.     

Coordination and delay in global games

What is the effect of offering agents an option to delay their choices in a global coordination game? We address this question by considering a canonical binary action global game, and allowing players to delay their irreversible decisions. Those that delay have access to accurate private information at the second stage, but receive lower payoffs. We show that, as noise vanishes, as long as the benefit to taking the risky action early is greater than the benefit of taking the risky action late, the introduction of the option to delay reduces the incidence of coordination failure in equilibrium relative to the standard case where all agents must choose their actions at the same time. We outline the welfare implications of this finding, and probe the robustness of our results from a variety of angles.