Many factors such as human movement can weaken indoor temperature stratification and lead to the advantages of displacement ventilation (DV) disappearing. Yet investigation for stratified destructive time during recovery after stops are still meagre so far. The concepts dynamic steady-state static proposed compute time( T b ). isothermal surface 295K is engaged explain variation . At last, rest...

education. today, a qualitative movement toward efficient trainings ineducational systems is necessary, since one of the important factors in the development and progress of any society is necessarily resources, manpower and their education.considering education as a basic system in growing human resources, the present article tries to address this matter, due to the fact that we are in a situ...

Mechanical instrumentation of the root surface causes the formation of a smear layer, which is a physical barrier that can affect periodontal regeneration. Although different procedures have been proposed to remove the smear layer, there is no information concerning how long the smear layer persists on root surfaces after instrumentation in vivo. This study assessed the presence of the smear la...

The practice of biology and medicine has been revolutionized during the past ten years by the advent of three biotechnologies--recombinant DNA techniques, the monoclonal antibody technology, and the development of microchemical instrumentation, machines that permit the rapid and effective synthesis and sequence analysis of proteins and genes. In this article, these powerful biotechnologies will...

introduction: one of the most common complications of root canal treatment is postoperative pain. the aim of the present clinical trial was to compare the severity of postoperative pain after root canal preparation with race rotary system and hand k-flexofile. methods and materials: a total of 96 mandibular first and second molars were divided into two groups ( n =48) based on root canal prepar...