نتایج جستجو برای: nine countries achieved maximum efficiency using this model
تعداد نتایج: 8620286 فیلتر نتایج به سال:
The removal of Cd2+ and Pb2+ ions from wastewater using p-tert-butyl-calix[4] arene was investigated in terms of initial pH, initial concentration, adsorbent dosage, contact time and temperature. The maximum adsorption occurred at the pH value of 6. The adsorbent studied exhibits high efficiency for Cd (II)and Pb (II) adsorption and the equilibrium states could be achieved in 10 min. Adsorption...
drought is transient phenomenon , slow , repetitive and integral part of the climate of each region. drought begins with a substantial reduction in precipitation over the long-term average rainfall and over time, reduced soil moisture and surface and ground water resources will continue to decrease. this phenomenon is the most important in bakhtegan basin because of its importance in strategic ...
water and nitrogen fertilizer are two main factors of agricultural production and deficiency of each one makes reduction in the yield. deficit irrigation is one of the ways for water management in arid and semiarid areas, but it is effective on the need of nitrogen. excessive use of nitrogen will be a waste of capital and environmental pollution. in this study the interaction of water and nitro...
a novel ultra wideband microstrip bandpass filter using radial stub loaded resonator and interdigital coupled lines is presented in this paper. the radial stub loaded resonator and decagonal patch form a resonator named m to create tuneable multiple notches in the passband for suppression wlan interference. to realize sharp roll-off, two adjustable transmission nulls are located at the lower an...
biodegradation of phenanthrene (phe) was studied in aqueous culture to demonstrate the potential of the mixed culture in degrading high concentration of phe. the experiments were conducted to monitor biodegradation of phenanthrene for duration of 6 days. biodegradation of phe was successfully achieved in low and middle concentration by the isolated mixed culture. a full factorial central compos...
the effective removal of dyes from aqueous wastewaters is among the most important issues formany industrialized countries. removal of congo red (cr) dye from aqueous solutions was studiedusing nickel oxide nanoparticles. the operating variables studied were initial ph of solution,adsorbents dosage, temperature and contact time. the morphological information of nickel oxidenanoparticles were ch...
In the current survey, the removal of dye from contaminated water was studied by photocatalytic degradation using TiO2 nanoparticles with respect to pH, TiO2 dosage, reaction time, temperature and initial dye concentration. TiO2 nanoparticles were investigated by XRD, FESEM and FT-IR.The RSM was chosen to study the composition effects of input independent factor...
Background and Objectives: Efficiency measurement can be used for all decision-makers and planners for useful resource allocation. Social Security Organization as a health service provider, provides part of health care services in indirect sector. This study aimed to assess the performance of provincial units of Social Security Organization in the indirect health services sector. Methods: Th...
background: mercury is a heavy metal with high toxic effects. it has many apply to various industries, so can enter to the environment from different resources. therefore, its elimination from wastewater is a major challenge. in this study, removal of mercury from aqueous solution using two types of almond shell was investigated and compared. methods: this experimental-intervention study has be...
the relationship between trade liberalisation and the environment has been the subject of a growing body of literature in recent years. as can be seen from the differing assessment of instrument types for environmental protection, one of the important factors for the relationship between environmental protection and economic competitiveness are regulatory stringency and efficiency. this concern...
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