نتایج جستجو برای: work
تعداد نتایج: 946735 فیلتر نتایج به سال:
Background: Nurses play an important role in the healthcare system and constitute the highest number of healthcare workers. A positive attitude or a positive state of mind at work may increase the ability to carry out the organization's duties, tasks and plans. The aim of this study was to investigate the relationship between work effectiveness and work engagement of nurses working in the selec...
واکنش بیجینلی یکی از مهمترین واکنش های چند جزئی برای سنتز دی هیدروپیریمیدینون ها است. این دسته از ترکیبات هتروسیکلیک دارای خواص دارویی جالبی از جمله ضد ویروس، ضد باکتری و اثرات ضد فشار خون و به عنوان تعدیل کننده کانال کلسیم استفاده می شود. یک روش بسیار کارآمد و بهبودیافته برای سنتز مشتقات دی هیدروپیریمیدینون ها در حضور کاتالیزگر مایع یونی گلیسین نیترات در دمای 80 در شرایط بدون حلال مورد استفاده...
در این تحقیق، 3-آمینو پروپیل ساپورت شده برروی سطح سیلیکا ((ap-sio2 بعنوان کاتالیزوری بازی موثر و قابل بازیافت برای واکنش افزایشی مایکل فسفیت استر ها به مالونیت های غیر اشباع در شرایط بدون حلال معرفی می شود. work-up ساده، بازیافت آسان کاتالیزور، شرایط ملایم واکنش، عدم تشکیل محصولات جانبی از مزایای این روش برای سنتز تعداد زیاد و متنوعی از بتا- فسفونومالونیت ها با راندمان های بالا و در زمانهای کوت...
Objective: An important factor in the prevention of industrial accidents is the employees’ ability to maintain their awareness of the work situation, understand the information it holds, and predict the development of the situations. In this study, we examined the role of work stress and sleepiness in predicting work situation awareness among workers. Methods: The present study was a cross-...
important factor in the prevention of industrial accidents involve of the ability of employees to maintain awareness of the work situation, understand the information it holds, and predict how situations will develop. in this study, we examined the role of fatigue and work overload in predicting work situation awareness among workers. the current study was a cross-sectional study. the sample co...
in the area of automotive engineering there is a tendency to more electrification of power train. in this work control of an induction machine for the application of electric vehicle is investigated. through the changing operating point of the machine, adapting the rotor magnetization current seems to be useful to increase the machines efficiency. in the literature there are many approaches wh...
Releasing the potential of online collaborative technologies in distributed work contexts is still a challenge for work systems managers. The availability of the technologies has outrun proven business models that can maximise the extraction of business value. Key problem areas remain in the management of online human interaction, control of business objectives within the medium, and risk manag...
background: workplace stress is known to be related with many behavioral and disease outcomes. however, little is known about its prospective relationship with measures of cognitive decline. objective: to investigate the association of job strain, psychological demands and job control on cognitive decline. methods: participants from framingham offspring cohort (n=1429), were assessed on job str...
United States prisons release more than 600,000 individuals each year. Within three years of release, 50 percent of released prisoners are back in prison. Work release has the potential to serve as a structured re-entry into the mainstream labor market. In an economic model of crime, an improvement in legal labor market opportunities should reduce criminal activity. After using a variety of eco...
Human-Centered Computing column " The State of Cog-nitive Systems Engineering, " 1 we had a lengthy discussion on the question, What is a user-hostile system? The following quote is from that essay: The road to user-hostile systems is paved with user-centered intentions on the part of the designers. Even smart, clever, well-intentioned people can build devices that are fragile and hostile, devi...
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