in most countries, educational programs and condom use is recommended as the most important approaches in controlling hiv infection. we examine the role of different approaches in controlling aids epidemics in our region. we find a high failure rate and probably undesirable effects for condom recommendation in epidemiological scale especially considering the low prevalence of hiv infection in o...

orthogonal frequency division multiplexing (ofdm) has become a promising method for many wireless communication applications. however, one main drawback of ofdm systems is the high peak-to-average power ratio (papr). selected mapping (slm) is a well-known technique to decrease the problem of high papr in ofdm systems. in this method, transmitter is obliged to send some bits named side informati...

objectives the present study aimed to compare the efficacy rate of avfs using two different anastomosis methods; side to side (sts) versus end to side (ets) and to determine whether the different approaches render any preferences or complications. background in candidate patients for permanent hemodialysis or dialysis on a regular basis, an appropriate vascular access has great importance. the ...

this paper deals with a failure investigation of boiler feed pump’s shaft of a steam power plant. boiler feed water pump is a specific type of pump used to pump, feed water into a steam boiler and is one of most important part of steam power plants. feed pumps failure may cause failure of another part of steam power station, therefore keep them safe is an important problem. there are 12 feed pu...

objective: at present, treatment of edentulous areas with implant-supported prosthesis has greatly increased. the aim of this study was to assess the survival rate of implants with different diameters. methods: this retrospective study was conducted on 239 warfare victims presenting to qazi tabatabaie clinic during 2000-2010. a total of 1,649 implants were placed. the success criteria included ...