频率不受运放参数影响的文氏桥振荡器

本文介绍一组（12个）新的正弦振荡器，这组振荡器使用两个运算放大器，其振荡频率不受单极点有源元件增益带宽之积的影响。这种特性是由本文所介绍的电路结构取得的，即不需要调节。     

Vying for time. Work and family

Time--there is never enough of it. There are never enough hours in the day to do everything at work and at home. Today's employees, forced to choose between work obligations and family responsibilities, often feel frazzled and guilty. Some employers recognize these conflicts and are finding ways to lighten the work/family load. They are offering a sophisticated combination of dependent-care options, flexible work hours and family-related benefits tailored to meet the needs of the employees within their specific industries. HRMagazine looks at leaders in six major industries--manufacturing, health, communications/technology, financial management, government and retail. No one can give employees that 25-hour day that everyone feels they need to juggle all their work and family obligations. But these industry leaders have provided a nurturing environment where employees can successfully balance those obligations.     

Linking Public Investment to Private Investment. The Case of Spanish Regions

Public investment constitutes one of the main instruments of regional policies. The existence of a direct link between infrastructure and regional income per capita is usually accepted. Literature also describes a positive effect of public investment on private capital accumulation. This paper seeks to provide new empirical evidence on this latter relationship for the case of Spanish regions over the period 1965–1997 using panel data methodology. The results show a positive effect of productive and social public investment (especially in education) on private investment. The spillover effects generated by the productive infrastructures located in other regions do not seem to encourage the private investment in neighbouring regions. Public consumption and interest rate exert a negative influence on private capital accumulation. These results are robust to changes in the econometric specification.     

REASONS FOR DELISTING AND CONSEQUENCES: A LITERATURE REVIEW AND RESEARCH AGENDA

This paper discusses the literature on delisting, drawing on USA and international evidence. Given the great heterogeneity in delisting operations, we first consider the standard existing typology based on the initiator of the delisting (the stock market authorities, or the firm itself). Second, while managers often cite high compliance costs (especially due to Sarbanes–Oxley Act implementation) as the official reason for the voluntary delisting of their firm, we highlight that firms face different trade-offs in their delisting decision. We also examine the reasons for involuntary delisting, especially the delisting dilemma faced by stock market authorities when the firm violates the listing requirements. Next, we review the economic consequences of delisting in terms of value creation or value destruction for shareholders. Finally, noting gaps in the literature and other contrasting results, we propose suggestions for future research.     

Association Between Independent Auditor Fees and Firm Value： A Study of Brazilian Public Companies

This article investigates the relationship between fees for audit and non-audit services with Tobin＇s Q. Using a sample of Brazilian public companies in the period from 2009 to 2011, we estimate the association between Tobin＇s Q and the auditors＇ remuneration scaled by total assets. Additionally, to strengthen the conclusions, we present a second model with the remuneration of the auditors in absolute terms. The results suggest a significant relationship between Tobin＇s Q and audit and non-audit fees, positive and negative, respectively. Specifically, increases in audit fees and non-audit fees respectively increase and decrease the Tobin＇s Q of the audited company. The results of this study have important implications for those interested in good corporate governance practices. Managers and board members concerned with value carefully evaluate the remuneration and nature of services creation, when engaging independent auditors, should provided.     

Green marketing strategies: an examination of stakeholders and the opportunities they present

As green marketing strategies become increasingly more important to firms adhering to a triple-bottom line performance evaluation, the present research seeks to better understand the role of “green” as a marketing strategy. Through an integration of the marketing, management, and operations literatures, an investigative framework is generated that identifies the various stakeholders potentially impacted through the environmentally friendly efforts of a firm. Specifically, the inter-connected nature of the core business disciplines of marketing, management (both strategy and human resources), and operations are examined as controllable functions within an organization from which strategies can be enacted to affect a firm’s stakeholders. The prior research in these areas is examined to identify potential research opportunities in marketing while also offering a series of representative research questions that can help guide future research in marketing.     

Globalization and trade union strategy: industrial restructuring and human resource management in the international civil aviation industry

For trade unions, the central problematic of globalization is the growing disparity between the mobility of capital and labour. The ability of capital to operate on a trans-national basis is widely perceived to have precipitated a process of cost cutting as international companies seek to cut workers' remuneration and other conditions of employment. However, systematic empirical evidence on the impact of globalization on human resource management is hard to find, as is any assessment of the differential impact of globalization on different occupational groups or the response of trade unions to any deterioration in their members' terms and conditions of employment. Focusing on the international civil aviation industry, we examine the effects of globalization on human resource management and the national and international strategies developed by organized labour in response. Although the evidence suggests that there is indeed a concerted effort by major airlines to cut costs, trade unions have been able to retard the pace of change and effectively defend the interests of some occupational groups. Moreover, the future course of globalization will be contested through new international strategies and repertoires of collective action developed by the trade union movement.     

Quantitative properties of sovereign default models: Solution methods matter

We study the sovereign default model that has been used to account for the cyclical behavior of interest rates in emerging market economies. This model is often solved using the discrete state space technique with evenly spaced grid points. We show that this method necessitates a large number of grid points to avoid generating spurious interest rate movements. This makes the discrete state technique significantly more inefficient than using Chebyshev polynomials or cubic spline interpolation to approximate the value functions. We show that the inefficiency of the discrete state space technique is more severe for parameterizations that feature a high sensitivity of the bond price to the borrowing level for the borrowing levels that are observed more frequently in the simulations. In addition, we find that the efficiency of the discrete state space technique can be greatly improved by (i) finding the equilibrium as the limit of the equilibrium of the finite-horizon version of the model, instead of iterating separately on the value and bond price functions and (ii) concentrating grid points in asset levels at which the bond price is more sensitive to the borrowing level and in levels that are observed more often in the model simulations. Our analysis is also relevant for the study of other credit markets.