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تعداد نتایج: 3628387 فیلتر نتایج به سال:
introduction: drought is a natural and recurrent feature of climate. the characterizations of it may change under the effect of climate change in future periods. during the last few decades a number of different indices have been developed to quantify drought probabilities. droughts are caused by disruptions to an expected precipitation pattern and can be intensified by unusually high temperatu...
The profitability of momentum and contrarian strategies indicates the predictability of stock returns, so these strategies contradict the concept of market efficiency. This paper investigates the profitability of intermediate and short-term horizon trading strategies in Tehran Stock Exchange. To do this, a sample of 50 companies accepted in Tehran Stock Exchange for the period of 2002 to 2007 w...
background over the last decade there has been an increase in healthcare expenditures while at the same time the inequity in distribution of resources has grown. these two issues have urged the researchers to review the determinants of healthcare expenditures. in this study, we surveyed the determinants of health expenditures in economic cooperation organization (eco) countries. methods we us...
Fingerprinting provides a means of tracing unauthorized redistribution of digital data by individually marking each authorized copy with a personalized serial number. In order to prevent a group of users from collectively escaping identi cation, collusion-secure ngerprinting codes have been proposed. In this paper, we introduce a new construction of a collusion-secure ngerprinting code which is...
in this paper we examine the effect of the oil volatility, consumer price index (cpi) and industrial production on the stock market return in tehran stock exchange (tse). we used seasonal data in period 1378-1390 and auto regressive distributed method (ardl) for the short-term and long-term relationship between the variables. as results of research indicate, we find that there is positive short...
برگروه لی$ g=so_{0}(n,1) $، یک متریک ناوردای چپ تعریف می شود که از فرم کیلینگ-کارتان بدست می آید. زیرگروه فشرده همبند بیشین آن عبارت است از $ so(n)=so(n) imeslbrace 1 brace $که با$ k $ نمایش می دهیم.گروه طولپایی های$ g $ عبارت است از egin{equation*} isom_{0}(g)=g imes k, end{equation*} یعنی ضرب چپ توسط عضو های$ g $ و ضرب راست توسط عضو های $ k $. بنابراین، دو عمل برای $ k...
this study investigated how group formation method, namely student-selected vs. teacher-assigned, influences the results of the community model of teaching creative writing; i.e., group dynamics and group outcome (the quality of performance). the study adopted an experimental comparison group and microgenetic research design to observe the change process over a relatively short period of time. ...
abstract the present research is prepared to study the culture of tea consuming among iranian. the case group which was statistically used for this study was people of lahijan , about four hundred wich were chosen according to their age , gender , education and occupation , randomly selected to fill the questionnaire . then the data collected through the questionnaire was analyzed according ...
Drought is a natural and climatic phenomenon that occurs in world wide areas every year and occurrence becomes an inevitable issue. This phenomenon is impaired in ecosystem. Arid rangeland ecosystems are a significant part of our land that is brittle systems that climatic changes are useful to simply unfounded destruction. Therefore, drought identifying and monitoring valid descriptive statisti...
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