Background and Aim: The majority of commercial curing units in dentistry are of halogen lamp type. The new polymerizing units such as blue LED are introduced in recent years. One of the important side effects of light curing is the temperature rise in composite resin polymerization which can affect the vitality of tooth pulp. The purpose of this study was to evaluate the temperature rise in two...

در این تحقیق خواص فیزیکی و مکانیکی چندسازه چوب پلاستیک حاصل از ترکیب های مختلف پلاستیک بازیافتی به همراه آرد چوب مورد بررسی قرار گرفت. نسبت پلاستیک های بازیافتی بر طبق نسبت پلاستیک ها در زباله های جامد شهری تهران انتخاب شد. برای این منظور چندسازه چوب پلاستیک با ماتریس یک نوع پلاستیک بازیافتی(high density polyethylene)، مخلوط دو hdpe/ low density polyethylene)، مخلوط سه (hdpe/ ldpe/ polypropylen...

Introduction: Safety in construction needs not only operating the executive laws and instructions but also the safety culture of all the workers in workshops. Safety culture is a factor by which all the workers are committed to having a positive share in the safety of their coworkers and themselves. Therefore, the aim of this study is identification of safety culture factors and ranking occupat...

As one of the methods of building new cities, high-rise construction has been considered by city managers for maximum use of space and limited resources. This article aims to improve the quality of construction and reduce resource consumption in high-rise buildings in the southwestern part of Mashhad, to clarify the perspective of ecological thinking in the current situation. so, the theory of ...