خصوصیات بتن تولید شده توسط تغییر در خصوصیات مصالح تشکیل دهنده بتن دستخوش تغییر می گردد،تغییراتی مثل: 1):کیفیت سیمان 2):نسبت آب به سیمان واقعی: که با به حساب نیاوردن وجود آب اضافی در سنگدانه ها یا فقدان آن این نسبت را دستخوش نوسان می نماید. 3):خصوصیات سنگدانه که به ابعاد زیر مربوط میگردند: الف):کیفیت سنگدانه ب):شکل سنگدانه ج):دانه بندی سنگدانه مقاومت مورد محاسبه در طرح اختلاط ، مقاومت متو...

Introduction: Hypertension is a major risk factor for coronary heart disease. Truck drivers are more exposed to hypertension due to sedentary life style and consequent obesity, improper food, job stress and high prevalence of cigarette smoking. Materials and Methods: In this study, after completing a questionnaire by interview, the blood pressures of 122 members of ::::union:::: of truck driver...

Introduction: Family members of psychiatric patients often experience disabilities and experiences of distress, anxiety, depression, and economic problems. The purpose of this study was to determine the effect of group educational interventions on the anxiety of primary caregivers of patients with type I bipolar disorder for the first time. Methods: The present study was a clinical trial with ...

  The performance of an X-bar chart is usually studied under the assumption that the process standard deviation is well estimated and does not change. This is, of course, not always the case in practice and X-bar charts are not robust against errors in estimating the process standard deviation or changing standard deviation. In this paper, the use of an exponentially weighted moving average (EW...

Introduction: Research self-efficacy can be expressed as people's judgments about their research abilities to organize and execute a series of tasks to achieve the specified research functions. Therefore, this study was conducted to evaluate students' research self-efficacy of North Khorasan University of Medical Sciences. Methods: The present study was a cross-sectional study performed on 240...