one of the effective methods to improve the thermal efficiency of solar collectors is using nanofluids as the coolant. the present study experimentally investigated the effect of sio2/water nanofluid with 1% mass fraction on the performance of a symmetric collector, i.e. conical solar collector. the conical solar collector with 1 m2 area and normal to the earth was tested in ahvaz, a city in th...

the paper attempts to study the efficiency of crop production and resource use effi-ciency on temple tenants and owner farms in tirunelveli district of tamil nadu. a sam-ple of 90 temple tenants and 50 owner farmers from two taluks of tirunelveli district, nawely, shencottah and tenkasi were selected for the study. the reference period of the study was 2002-2003. the efficiency analysis with th...

Block chain technology has changed the traditional digital economy, promoted formation of a new value and trust system, at same time triggered transformation cultural industry, providing means to improve investment efficiency. This paper takes listed companies industry in concept block as research sample, uses DEA efficiency evaluation method empirically analyze change The results show that: an...

This paper, first, obtained three categories of efficiencies, overall bias-corrected technical efficiency (OTEBC), pure (PTEBC) and scale (SE) the Islamic banks Gulf Cooperating Countries (GCC) during 2014-216 using bootstrap Data envelopment Analysis(DEA). Second, decomposing (OTEBC) paper found were 91 percent 59.8 respectively thus PTEBC dominated OTBBC (82.4 percent) SE (59.8 GCC banks. Thi...

In the context of Beijing’s accelerated economic growth, a high urbanization rate and associated urban problems pose challenges. We collected panel data for the period 2005–2014 to examine the relationship between Beijing’s urbanization efficiency and economic growth rate as well as its spatial patterns of dynamic and static urbanization efficiency. Specifically, we developed a comprehensive in...

The purpose of this study was to measure the technical efficiency of canola farmers and determine the underpinning factors. Required data were collected using stratified random sampling method and questionnaire survey. In this context, 157 canola farmers from Tabriz County, Iran, were asked to fill out the questionnaire in 2012-2013 growing season. The technical efficiency was evaluated using s...

the main purpose of this research paper is to calculate irans housing (maskan) bank through the use of data envelopment analysis. in this research, the performance of 33 branches of the housing bank throughout tehran (capital city of iran) within 2002-2004 was analyzed and discussed. the results of the study shows that average technical efficiencies of housing bank branches in two hypotheses of...