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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: تحقیقات مالی
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی: -
- انتشار مقاله: 11-10-1348
- نویسندگان: Sudhir K Chawla,Zafar U Khan,Mehdi Taghavi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Water and Environmental Nanotechnology
- نوع مقاله: Journal Article
- کلمات کلیدی: Chromium,Zero-valent iron nanoparticles,Polymer,Removal,Stabilize
- چکیده:
- چکیده انگلیسی: Zero-valent iron particles at the nanoscale are proposed to be one of the important reductants of Cr(VI), transforming the same into nontoxic Cr(III). In this study zero valent iron nanoparticles(ZVINs) were synthesized and characterized for hexavalent chromium removal from aqueous solutions. Five different zero-valent iron nanoparticle types comprising of bare and stabilized ZVINs with poly acrylamide(PAM), polyvinyl pyrrolidone(PVP), polystyrene sulfonate(PSS) and guar gum(GG) were synthesized and employed in this study. The sizes of zero-valent iron nanoparticles were found to be 40, 14, 17, 29 and 34nm, using transmission electron microscopy (TEM), corresponding to bare zero valent iron nanoparticles(ZVINs), poly acrylamide(PAM), guar gum(GG), poly styrene solfunate(PSS) and polyvinyl pyrrolidone(PVP) stabilized zero valent iron nanoparticles (ZVINs) respectively. The trend in the sizes of ZVINs with various stabilizers in the decreasing order was found to be bare ZVIN > PVP-ZVIN >PSS-ZVIN> GG-ZVIN> PAM-ZVIN respectively. Results showed that by increasing hexavalent chromium concentrations from 20 to 100 mg/L, the Cr(VI) efficiency removal decreased significantly. When the ZVINs concentrations increased from 2 to 10 gr/L(0.1 to 0.5g per 50 mL), the Cr(VI) removal efficiency enhanced. The most effective treatments of ZVINs and Cr(VI) for hexavalent chromium removal from solutions were 10 gr/lit (0.5g per 50 mL) and 20 mg/L respectively, so the efficiency of bare and polymer stabilized-ZVINs on Cr(VI) removal from solutions was found to be in the following order: bare ZVINs < PVP-ZVINs
- انتشار مقاله: 05-12-1395
- نویسندگان: Mohammad Taghi Kouhiyan Afzal,Ahmad Farrokhian Firouzi,Mehdi Taghavi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Management and Business Research
- نوع مقاله: Journal Article
- کلمات کلیدی: uncertainty,Real Exchange Rate,Real national income,Real import,TARCH
- چکیده:
- چکیده انگلیسی: This paper investigates the effect of exchange rate uncertainty on the Iran’s import trade. The exchange rate uncertainty series were generated utilizing the TARCH model. This model analyzes the asymmetric effects. The analysis of uncertainty and asymmetry of the exchange rate shows significant TARCH effect on Iran’s exchange rates. The findings of the study indicate negative shocks (bad news) had greater impact on volatility during the period. In the next stage imports demand function is estimated. There was a long run relationship among, real import demand, real national income, real exchange rate and uncertainty of real exchange rate. Results show significant and negative impact of exchange rate uncertainty on Iran’s imports, and import demand is positively affected by real national income. Furthermore significant and negative impact of real exchange rate on Iran’s real imports is found.
- انتشار مقاله: 27-11-1390
- نویسندگان: Teimour Mohammadi,Mehdi Taghavi,Abolghasem Bandidarian
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Management and Business Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Economic Growth,Administrative corruption,Capital stock,Labor force
- چکیده:
- چکیده انگلیسی: In the initial models of economic growth, economic factors entered in to models but in the following models, non-economic factors entered in to models. Many broad studies were done on this subject by the economists, and already considerable results were obtained. Subjects such as corruption in the administrative bodies were new variables entering the literature of economic growth at that stage. In this area, we studied the impact of administrative corruption on the economic growth of ECO member countries and OPEC member countries. The paper presents a comparative study on oil producing developing countries and non-oil producing developing countries for the period of 2003-2008. All ECO member countries with the exception of Iran, Iraq and Afghanistan and also OPEC member countries are included in this study . The results of research based on Panel data approach indicate a reverse and significant relation effect between administrative corruption and economic growth of ECO member countries and OPEC member countries.
- انتشار مقاله: 05-03-1390
- نویسندگان: Mehdi Taghavi,Hashem Nikoomaram,Sedigheh Tootian
- مشاهده