background: stress is a nonspecific reaction to everything the body needs. although occupational stress exists in every occupation, it is seen with more frequency and intensity amongst those occupations related to human health. in this study, we aimed to investigate the level of occupational stress in operating room staffs working in the hospitals affiliated to isfahan university of medical sci...

The issue addressed in this paper is the optimal taxation of incomes earned tn the home economy, and of incomes earned abroad, when people can migrate. As a preliminary, the optimal taxation of home incomes when there is migration and no taxation of foreign incomes, is discussed. Then in a more general setting, we deal with optimal taxation of different kinds of labour when another kind of labo...

This study investigates whether personal taxes are related to asset valuations. The effective tax rate of investment income fluctuated considerably since federal income taxes were introduced. The main result of the paper demonstrates that there is an economically and statistically significant relationship between asset valuations and personal tax rates. Stock valuations tend to be higher when t...

A methodology to minimize potential environmental impact and operating cost in the selection of the operating conditions of a steam and power plant is presented. A bi-objective mixed integer nonlinear programming problem is formulated and solved in GAMS. Different strategies are implemented successfully to generate the Pareto curve such as: minimum distance to the utopia point, ε-constraint, we...

BACKGROUND The Trauma and Injury Severity Score (TRISS) has been criticized for being based on data from the USA and Canada-high-income countries-and therefore, it may not be applicable to low-income and middle-income countries. The present study evaluated the accuracy of three adjustments to the TRISS equation model (NTRISS-like; TRISS SpO2; NTRISS-like SpO2) in a high-income and a middle-inco...

This paper takes the city of Shanghai as object, and examines impact takeaway industry on operating income catering in Shanghai. A linear regression model is used to establish a prediction for industry. Considering time node rise industry, development trend industry's business before fitted, significance quantified based error by comparing results with actual data. Six key indicators national e...

in this article, optimal vat rates have been calculated for the three different levels of consumption tax revenue needed by the government. using the data of 10 income groups of the iranian rural and urban households in the period(1378-1386) and applying panel data approach, the almost ideal demand system(aids) were estimated to derive the price and income elasticities. then, the optimal vat ra...

since 2001 the adoption of iran accounting standards has become obligatory. this study by using a sample of companies listed in tehran stock exchange (tse) compares the value relevance of ten selected accounting variables in two periods, before mandatory adaption of accounting standards (1996-1998) and after that (2005-2007). in this study the researchers have tried to control the effect of eco...

BACKGROUND Socioeconomic status (SES) indicators including education, income, and occupation are associated with coronary heart disease (CHD) risk factors, morbidity, and mortality. In most industrialized nations, individuals with less education, lower income, and blue collar occupations have the highest CHD rates. It is suggested by some that these differences by SES are increasing even as age...