液相色谱-串联四级杆质谱方法检测动物源性基质中的β2——受体激动剂

利用安捷伦6410高效液相色谱串联质谱（LC／MS／MS）方法快速、准确地测定多种β2-受体激动剂的残留量。串联质谱在电喷雾（ESI＋）,多反应监测（MRM）模式下,进行质谱定性和定量分析,比液相检测方法灵敏、快速。该方法的定量检测限（LOQ）大多在0．5μg／kg以下,完全可以达到欧盟和日本对β2-受体激动剂残留限量的要求。     

An empirical examination of the informational content of credit ratings in China

We examine the certification effect of initial rating announcements and the signaling effect of rating downgrade announcements in China using a pooled time-series cross-sectional issuer rating data of 170 companies listed on the Shanghai and Shenzhen Stock Exchanges from 2002 to July 2006. The empirical evidence supports our hypothesis of an asymmetric certification effect. Consistent with the literature, we also find some negative signaling effects in our rating downgrade sub-sample. Overall, although there are some qualitative arguments that credit ratings in China do not have information content, our empirical findings suggest otherwise. When a normally positively biased rating agency gives a low rating, it is valuable news to market participants.     

The Role of Retail Equity,Value and Relational Benefits in Building B2B Relationships in Retailing

Abstract

The present paper aims to examine if variables widely studied in B2C contribute to building strong relationships in B2B markets. Moreover, it analyzes the existence of differences across retailers related to percentage of purchases from the main supplier. Through a personal survey to retail store managers regarding their relationships with their main suppliers, a structural equation model is estimated through PLS to test the hypothesized relations between retail equity, value, relational benefits, trust, and commitment. A multi-group analysis is performed to test the moderating role of the percentage of purchases from the main supplier. Three types of relational benefits identified have unequal influence on relationship value. In particular, special treatment benefits and social benefits, together with retail equity, emerge as the main drivers of value in the relationship between retailers and their main suppliers. The percentage of purchases from the main supplier plays a moderating role in some of these relations. This research provides evidence in the sense that, in the relations held by retailers with their main suppliers, retail equity contributes to relationship value creation. Relational benefits are relevant in building B2B relations since special treatment and social benefits have a positive influence on value that is positively related to trust and commitment. To build strong relations with their customers, suppliers of retailers should mainly concentrate their efforts on building brand equity and providing evidence of the existence of special treatment benefits beyond the service delivered, in view of its ultimate influence on customer trust and commitment.     

Comparing Digital Strategies and Social Media Usage in B2B and B2C Industries in Spain

ABSTRACT

Using 285 responses obtained in a survey of high- and middle-level managers of firms located in Spain and by implementing clustering techniques, we identify differences in the conception and adoption of a digital strategy and the use of social media. A driver for these differences is represented by whether companies are adopting a B2C or a B2B business model. Specifically, B2B companies are slower to generate an overall digital strategy compared to B2C firms. Moreover, B2B firms adopting a digital strategy are prioritizing the use of more professionally oriented platforms (e.g., LinkedIn), while B2C firms are favoring the use of more socially oriented services (e.g., Facebook). Additionally, we find that those B2C companies without a clear digital strategy are nonetheless significantly using social media, particularly social networks, while B2B companies are delaying the use of social media until conceiving a clear digital strategy.     

P2P融资模式存在的风险及防范对策研究

互联网金融制度下的P2 P网络信贷是一种比较成功的小贷发展模式，而小微企业最青睐的就是正处在发展势头中的P2 P网络信贷。当前P2 P行业迅速发展，且形成了一定的规模，并已初步形成一个崭新的行业。但P2 P平台的不断跑路现象也暴露出平台存在风险及缺陷。所以，控制风险是P2 P平台赖以生存的前提，也是P2 P行业长期保持竞争优势的关键。     

小包装油料二维条码识读设备选型研究

调研条码识读设备技术发展现状，充分考察小包装油料的管理环境和业务流程特点，在此基础上深入分析不同类型条码识读设备在小包装油料仓库管理中的适应性，为小包装油料自动识别系统建设的硬件选型提供参考。     

The Intergenerational Consequences of Tobacco Policy: A Review of Policy's Influence on Maternal Smoking and Child Health

The response of pregnant women to tobacco policy is of particular interest due to these women being in a unique position to pass health capital to the next generation. By comparing estimates in the literature, we highlight that while pregnant women are responsive to taxes and taxes improve child health, their responsiveness has declined over time. We show that these trends reflect a compositional change; specifically, the least addicted smokers quit in the 1990s, leaving the pool of smoking mothers to be dominated by less price elastic smokers. Reviewing the literature on other tobacco policies, we show that a state‐level U.S. smoking ban has roughly three times the effect on pregnant women of a 10% increase in prices using elasticity estimates from more recent periods. Throughout this review, we identify areas for improvement in the literature and offer a number of ideas for future research projects.     

What can we learn from revisions to the Greenbook forecasts?

Although there have been many evaluations of the Federal Reserve’s Greenbook forecasts, we analyze them in a different dimension. We examine the revisions of these forecasts in the context of fixed event predictions to determine how new information is incorporated in the forecasting process. This analysis permits us to determine if there was an inefficient use of information in the sense that the forecast revision has predictive power for the forecast error. Research on forecast smoothing suggests that we might find a positive relationship between the forecast error and the forecast revision. Although we do find for some variables and horizons the Fed’s forecast errors are predictable from its forecast revisions, there is no evidence of forecast smoothing. Instead the revisions sometimes have a negative relationship with the forecast error, suggesting in these cases that the Fed may be over-responsive to new information.     

Monetary policy and bank lending in the Euro area: Is there a stock market channel or an interest rate channel?

In this paper I compare a traditional demand oriented model of bank lending with its focus on short-term interest rates in the money market, to a non-traditional capital budgeting model of bank lending based on movements in share valuations for the Euro area. Using non-nested hypothesis tests, omitted variables tests, and Granger Causality tests, I reject the traditional demand oriented model of bank lending and fail to reject the capital budgeting model of bank lending for Monetary Financial Institutions (MFI's) in the Euro area. Even though Europe is a bank-based financial system, it appears the stock market plays a key role in the lending decisions and allocation of resources in Europe. One possible policy implication of this research is that the central bank should try and stabilize stock prices in order to achieve their goal of stabilizing bank lending and the economy.     

Use of quadratic terms in Type 2 Tobit models

A Type 2 Tobit model with a common set of regressors in the selection and regression equations is identified by the nonlinearity of the distribution function. The estimates are relatively less precise than in cases where there are at least some distinct regressors in the two equations. In an attempt to overcome this problem, some authors introduce quadratic terms into one or both equations. As this does not add any new statistical information, just a deterministic function of an existing regressor, the sceptic would question how this could improve the reliability of the estimates. This article shows that arbitrary use of quadratics is not without consequence. It increases the chances of getting either multiple roots, no root or a local root where a global does not exist. The nature of this problem is illustrated with Monte Carlo methods as well as several examples from the literature.