We propose a systematic method for creating constellations of unitary space–time signals for multiple-antenna communication links. Unitary space–time signals, which are orthonormal in time across the antennas, have been shown to be well-tailored to a Rayleigh fading channel where neither the transmitter nor the receiver knows the fading coefficients. The signals can achieve low probability of e...

the present study was conducted to investigate the impacts of retrofitted cng vehicles on airpollutant emissions in tehran over a 20 years period using available statistical data, precise automobile tests, data analysis, and leap software. the obtained results revealed an increase in air pollutant emissionsincluding co (equal to 1030.77 thousand tons), nox (equal to 1030.77 thousand tons), thc ...

the present study was conducted to investigate the impacts of retrofitted cng vehicles on airpollutant emissions in tehran over a 20 years period using available statistical data, precise automobile tests, data analysis, and leap software. the obtained results revealed an increase in air pollutant emissionsincluding co (equal to 1030.77 thousand tons), nox (equal to 1030.77 thousand tons), thc ...

In Automobile Industries, to use of High Security Registration plate (HSRP) is still a challenging problem. There are more options to misuse the vehicle and exchange its engine, chassis, gear box, axle etc., In an existing system, the Regional Transport Office (RTO) only determine an abstract of the vehicle and its owner. The vehicles are classified using piezo sensor and inductive loop systems...

Following the occurrence of unexpected events and natural disasters, a highly important relief operation is the transferring of relief commodities from the distribution centers (CDs) to shelters. In this paper, a three-level network consisting of depot of vehicles, distribution centers and shelters has been considered for routing and scheduling of relief vehicles through introducing a multi-obj...

the purpose of research was analysis of innovation management in processing and complementary industriesof livestock products. the method of research was correlative descriptive. the statistical population of this study was all managers in processing and complementary industriesof livestock products of khouzestan province (n=486). the sampling method was stratified random sampling. the sample s...

environmental pollution with heavy metals is a global struggle. phytoremediation is an effectiveand low-cost technology for refinement of polluted soils. this research was conducted in zanjan province(located in north west iran) where metallurgical industries are developed quickly. in this study, based on theheavy metals contamination of soil in the studied area six sampling sites were selected...

the purpose of this research was identifying factors affecting the development of processing and complementary industries of date palm in khouzestan province. the method of research was causal comparative. the population of this research was managers in processing and complementary industries of date palm products of khouzestan province (n=100). the return rate was 94% (n=94). by census method...

In recent years, car-sharing systems have been announced as a way to increase mobility and to decrease the number of single-occupant vehicles, congestion, and air pollution in many parts of the world. This study presents a linear programming model to optimize one-way car-sharing systems for electric cars considering the depreciation costs of chargers and vehicles as well as relocation cost of v...

Nanotechnology is now applied to many industries, resulting in wide range of nanomaterial-containing products, such as electronic components, cosmetic, medicines, vehicles, and home appliances. Nanoparticles can be released throughout the life cycle of nanoproducts, including the manufacture, consumer use, and disposal, thereby involving workers, consumers, and the environment in potential expo...