conclusions as it was previously reported by the world health organization (who) on hav infection in the country, this study revealed a high prevalence of hav infection in mashhad. background hepatitis a virus (hav) is the most common cause of acute viral hepatitis worldwide, mostly in developing countries. objectives this population-based survey was performed to investigate hav seroprevalence ...

because of the piecewise linear nature of the data envelopment analysis (dea) frontier, the optimal multipliers of the dea models may not be unique. choosing weights from alternative optimal solutions of dual multiplier models is one of the most frequently studied subjects in the context of dea. in this paper, the authors have been inspired by the idea of cooper et al. (2011) to propose a linea...

penicillin g acylase from e. coli ta1 was immobilized by cross-linked enzyme aggregates (clea), a new method for immobilization. this biocatalyst and commercial immobilized penicillin g acylase (pga-450) were used to study the effect of ph, temperature and substrate concentration on the synthesis of ampicillin from phenyl glycine methyl ester (pgme) and 6-aminopenicillanic acid (6-apa). compare...

in this study, irib regarding to the position and its functions of as a medium of communication has been analyzed and tried to identify the national and global key factors, in the next ten years to 1404, influencing it in political, social, economic and technological environment and then found out the organizational capabilities. therefore the future situation of a very large and very complex o...

The implementation of high-fidelity swapping operations is vital importance for executing quantum algorithms on a processor with limited connectivity. We present an efficient pulse-control technique, the cross-cross resonance (CCR) gate, to implement iswap and swap gates dispersively coupled fixed-frequency transmon qubits. key operation CCR gate simultaneous driving both qubits at frequency an...

aims: considering the medical significance of cockroaches as insect vectors of food toxicities, and triggering allergy in respiratory system and skin, this survey was conducted to study the frequency of infestation and their effective factors in shahin shahr, iran. materials & methods: this cross-sectional descriptive study was carried out in 2010 in shahin shahr, isfahan, iran. data gathering ...

proteases are important enzymes that their role in various industries is undeniable. however, keeping enzymes stable during its activity in harsh conditions is so important. in this study, protease enzyme was immobilized on the porous silica particles and its stability in different temperatures and phs was evaluated. first silica particles were aminated by 3-aminopropyltriethoxysilane then the ...

on the basis of a cross-sectional demographic survey that was conducted among the qashqai tribe of southern iran in 1973, the crude birth rate was estimated at 48.2 per thousand per year. the most productive age groups, was 25-29 years. forty-nine, point seven per cent (49.7%) or about one half of the total births occurred among married women aged 20 to 29 years eighty-seven point three per cen...

data envelope analysis (dea) is an approach to estimate the relative efficiency of decision making units (dmus). several studies were conducted in order to prioritize efficient units and some useful models such as cross-efficiency matrix (cem) were presented.  besides, a number of dea models with interval data have been developed and ranking dmus with such data was solved. however, presenting a...