the present study was conducted with the aim of evaluating the professional library staff in tehran university libraries. distributing two kinds of questionnaires relating to manager and library information specialist staff occupying 18 libraries, their attendance in different parts of library and their conformity with standards was surveyed. appling evaluative survey in fulfilling present stud...

Calcium carbonate has the potential to be used in development of medical materials, including biomaterials. Biocomposite is composed CaCO3 as matrix material and bioplastic from combination corn starch cassava reinforcement. This study aims determine mechanical properties such tensile strength bending/flexural with varying compositions bioplastic. Characterization biocomposite uses Scanning Ele...

Studies suggest that sleep disorders affect 50 to 70 million Americans, representing approximately 20 percent of the population. A sleep disorder exists whenever a lower quality of sleep results in impaired functioning or excessive sleepiness. Insomnia, literally “inability to sleep,” has various etiologies and is the most common sleep disorder, affecting between 6 to 12 percent of the adult po...

The lifetime incidence of kidney stones is approximately 13 percent for men and 7 percent for women.1,2 Reports conflict regarding whether incidence is rising overall but consistently report rising incidence in women and a falling male-to-female ratio.3-5 Although stones may be asymptomatic,6 potential consequences include abdominal and flank pain, nausea and vomiting, urinary tract obstruction...

the majority of coronary artery fistulas (cafs) are congenital. the anomaly accounts for 0.4% of congenital heart defects and approximately 50% of pediatric coronary vasculature anomalies. twenty percent of people with congenital cafs have other concomitant cardiac anomalies, most frequently aortic and pulmonary atresia and patent ductus arteriosus. it is worthy of note that caf with the tetral...

The potential for efficient production of hydrogen-rich gas from hydrocarbon fuels using thermal plasmas has been investigated both analytically and experimentally. Thermodynamic analysis shows that the most efficient production of hydrogen from hydrocarbons can be achieved by partial oxidation (lambda = 0.25); at optimal conditions, the availability of the output fuel mixture is 83 percent of ...

Ich erkläre, daß ich diese Arbeit selbständig verfaßt und keine anderen als die angegebe-nen Quellen und Hilfsmittel benutzt habe.

Ich erkläre, daß ich diese Arbeit selbständig verfaßt und keine anderen als die angegebenen Quellen und Hilfsmittel benutzt habe.