Efficient filtration system for paraffin-catalyst slurry separation

The filtration efficiency for separating liquid paraffin (or water) from a slurry consisting of 25 weight% spherical alumina in a Slurry Bubble Column Reactor (SBCR) comprised of a cylindrical tube of 10 cm diameter and 150 cm length was studied. Various differential pressures (ΔP) were applied to two separate tubular sintered metal stainless steel filter elements with nominal pore size of 4 and 16μm. The experimental results disclosed that the rate of filtrations increased on applying higher differential pressure to the filter element. Albeit this phenomenon is limited to moderate ΔPs and for ΔP more than 1 bar is neither harmful nor helpful. The highest filtration rates at ΔPs higher than 1 bar were 170 and 248 ml/minute for 4 and 16μm respectively. Using water as the liquid in slurry the rate of filtration enhanced to 4 folds, and this issue reveals impact of viscosity on filtration efficiency clearly. In all situations, the total amount of particles present in the filtrate part never exceeded a few parts per million (ppm). The statistical analysis of the SEM image of the filtrate indicated that by applying higher pressure difference to the filter element the frequency percent of larger particle size increases. The operation of filter cake removing was performed with back flashing of 300 ml of clean liquid with pressures of 3-5 bar of N2 gas

El impacto del factor ambiental en el desarrollo económico de Kerman durante el Ilkanato

Natural phenomena are one of the influencing factors in the economic and social situation of human societies. However, it is clear that the mode and extent of this effect depends on the natural state of this or that area. On the other hand, Iran's historical events and circumstances appear to have been less studied geographically. The present study examines the probable impact of the natural phenomena of the Kerman province, their prominent and diverse natural and human characteristics on the sources of the Iakhanan period. For this purpose, it uses the historical and geographical reports of the 7th and 8th centuries. The above findings are important in this regard, demonstrating the history of economic developments in Kerman and other parts of Iran should not affect only in light of human events.Los fenómenos naturales son uno de los factores influyentes en la situación económica y social de las sociedades humanas. Sin embargo, está claro que el modo y el alcance de este efecto depende del estado natural de esta o aquella área. Por otro lado, los eventos y circunstancias históricas de Irán parecen haber sido menos estudiados desde una perspectiva geográfica. El presente estudio examina el probable impacto de los fenómenos naturales de la provincia de Kerman, sus características naturales y humanas prominentes y diversas en las fuentes del período Iakhanan. Para este propósito, se sirve de los informes históricos y geográficos de los siglos VII y VIII. Los hallazgos anteriores son importantes a este respecto, lo que demuestra que la historia de los desarrollos económicos de Kerman y otras partes de Irán no deben considerarse solo a la luz de los acontecimientos humanos

A ROBUST GA/KNN BASED HYPOTHESIS VERIFICATION SYSTEM FOR VEHICLE DETECTION

ABSTRACT Vehicle detection is an important issue in driver assistance systems and self-guided vehicles that include

Identification and prioritization of efficiency-influencing factors in banking using MADM technique (Case study: Tejarat Bank)

The present study is an attempt to identify and prioritize efficiency-influencing factors in banking system based on Analytic Hierarchy Process (AHP) and (topsis), performed by considering comments and remarks of Tejarat bank experts in Tehran. For this purpose, first the most important efficiency-influencing factors were identified by studying the related literature, background of the study, and interviews with some of Tejarat bank’s managers and authorities. Then, by performing a field study, it was attempted to ask Tejarat bank experts for their opinions in Tehran as the statistical population of the study. After analyzing data and testing measures using T- student test, it was finally found that all recognized variables and factors influence banking efficiency. Results obtained from Analytic Hierarchy Process (AHP)-based statistical studies and analyses indicated that among the main criteria, the criteria of hardware, software, and working systems are the most important, followed by manpower; financial tools and attitudes have the lowest priority. Also, regarding sub-criteria, the sub-criteria of customers-specific convenient facilities, targeted marketing and advertisement of products and services had the highest rank

Identification and prioritization of efficiency-influencing factors in banking using MADM technique (Case study: Tejarat Bank)

The present study is an attempt to identify and prioritize efficiency-influencing factors in banking system based on Analytic Hierarchy Process (AHP) and (topsis), performed by considering comments and remarks of Tejarat bank experts in Tehran. For this purpose, first the most important efficiency-influencing factors were identified by studying the related literature, background of the study, and interviews with some of Tejarat bank’s managers and authorities. Then, by performing a field study, it was attempted to ask Tejarat bank experts for their opinions in Tehran as the statistical population of the study. After analyzing data and testing measures using T- student test, it was finally found that all recognized variables and factors influence banking efficiency. Results obtained from Analytic Hierarchy Process (AHP)-based statistical studies and analyses indicated that among the main criteria, the criteria of hardware, software, and working systems are the most important, followed by manpower; financial tools and attitudes have the lowest priority. Also, regarding sub-criteria, the sub-criteria of customers-specific convenient facilities, targeted marketing and advertisement of products and services had the highest rank

Identification and prioritization of efficiency-influencing factors in banking using MADM technique (Case study: Tejarat Bank)

The present study is an attempt to identify and prioritize efficiency-influencing factors in banking system based on Analytic Hierarchy Process (AHP) and (topsis), performed by considering comments and remarks of Tejarat bank experts in Tehran. For this purpose, first the most important efficiency-influencing factors were identified by studying the related literature, background of the study, and interviews with some of Tejarat bank’s managers and authorities. Then, by performing a field study, it was attempted to ask Tejarat bank experts for their opinions in Tehran as the statistical population of the study. After analyzing data and testing measures using T- student test, it was finally found that all recognized variables and factors influence banking efficiency. Results obtained from Analytic Hierarchy Process (AHP)-based statistical studies and analyses indicated that among the main criteria, the criteria of hardware, software, and working systems are the most important, followed by manpower; financial tools and attitudes have the lowest priority. Also, regarding sub-criteria, the sub-criteria of customers-specific convenient facilities, targeted marketing and advertisement of products and services had the highest rank

Wild Relatives of Wheat Respond Well to Water Deficit Stress : A Comparative Study of Antioxidant Enzyme Activities and Their Encoding Gene Expression

Previous studies have revealed that some wild wheat accessions respond well to water deficit treatments and have a good potential in terms of photosynthetic parameters, root system architecture, and several physiological properties. However, the biochemical responses and molecular mechanisms of antioxidant-encoding genes remain to be elucidated. Herein, we investigated the most tolerant accessions fromA. crassa,Ae. tauschii, andAe. cylindricapreviously identified from a core collection in previous studies, along with a control variety of bread wheat (T. aestivumcv. Sirvan) through measuring the shoot fresh and dry biomasses; the activities of antioxidant enzymes (including ascorbate peroxidase (APX), catalase (CAT), guaiacol peroxidase (GPX), and peroxidase (POD)); and the relative expression ofCAT, superoxide dismutase (MnSOD), andGPXandAPXgenes under control and water deficit conditions. Water deficit stress caused a significant decrease in the shoot biomasses but resulted in an increase in the activity of all antioxidant enzymes and relative expression of antioxidant enzyme-encoding genes. Principal component analysis showed a strong association between the shoot dry biomass and the activity of CAT, POD, and APX, as well asMnSODgene expression. Thus, these traits can be used as biomarkers to screen the tolerant plant material in the early growth stage. Taken together, our findings exposed the fact thatAe. tauschiiandAe. crassarespond better to water deficit stress thanAe. cylindricaand a control variety. Furthermore, these accessions can be subjected to further molecular investigation.Peer reviewe

Wild Relatives of Wheat Respond Well to Water Deficit Stress: A Comparative Study of Antioxidant Enzyme Activities and Their Encoding Gene Expression

Previous studies have revealed that some wild wheat accessions respond well to water deficit treatments and have a good potential in terms of photosynthetic parameters, root system architecture, and several physiological properties. However, the biochemical responses and molecular mechanisms of antioxidant-encoding genes remain to be elucidated. Herein, we investigated the most tolerant accessions from A. crassa, Ae. tauschii, and Ae. cylindrica previously identified from a core collection in previous studies, along with a control variety of bread wheat (T. aestivum cv. Sirvan) through measuring the shoot fresh and dry biomasses; the activities of antioxidant enzymes (including ascorbate peroxidase (APX), catalase (CAT), guaiacol peroxidase (GPX), and peroxidase (POD)); and the relative expression of CAT, superoxide dismutase (MnSOD), and GPX and APX genes under control and water deficit conditions. Water deficit stress caused a significant decrease in the shoot biomasses but resulted in an increase in the activity of all antioxidant enzymes and relative expression of antioxidant enzyme-encoding genes. Principal component analysis showed a strong association between the shoot dry biomass and the activity of CAT, POD, and APX, as well as MnSOD gene expression. Thus, these traits can be used as biomarkers to screen the tolerant plant material in the early growth stage. Taken together, our findings exposed the fact that Ae. tauschii and Ae. crassa respond better to water deficit stress than Ae. cylindrica and a control variety. Furthermore, these accessions can be subjected to further molecular investigation

Effect of Water Deficit Stress on Seedling Biomass and Physio-Chemical Characteristics in Different Species of Wheat Possessing the D Genome

Wild relatives of wheat serve as an extraordinary source of variability for breeding programs due to their capabilities to respond to various environmental stresses. Here, we investigated some species possessing a D genome (T. aestivum, Ae. tauschii, Ae. crassa and Ae. cylindrica) in terms of relative water content (RWC), stomatal conductance (Gs), relative chlorophyll content, initial fluorescence (Fo), maximum quantum yield of PSII (Fv/Fm), maximum primary yield of PSII photochemistry (Fv/Fo), as well as shoot fresh and dry biomasses under control and water deficit conditions. Our results revealed that water deficit negatively affected all traits; shoot fresh weight, Gs and RWC showed the highest reduction compared to the control condition. Principal component analysis (PCA) identified two PCs that accounted for 53.36% of the total variation in the water deficit conditions. Correlation analysis and PCA-based biplots showed that stress tolerance index (STI) is significantly associated with Fv/Fm and Fv/Fo under water stress conditions, suggesting that these are the best parameters to evaluate when screening for tolerant samples at the seedling stage. We identified 19 accessions from Ae. crassa and one from Ae. tauschii as the most tolerant samples. In conclusion, Ae. crassa might provide an ideal genetic resource for drought-tolerant wheat breeds

Effect of Water Deficit Stress on Seedling Biomass and Physio-Chemical Characteristics in Different Species of Wheat Possessing the D Genome

Wild relatives of wheat serve as an extraordinary source of variability for breeding programs due to their capabilities to respond to various environmental stresses. Here, we investigated some species possessing a D genome (T. aestivum, Ae. tauschii, Ae. crassa and Ae. cylindrica) in terms of relative water content (RWC), stomatal conductance (Gs), relative chlorophyll content, initial fluorescence (Fo), maximum quantum yield of PSII (Fv/Fm), maximum primary yield of PSII photochemistry (Fv/Fo), as well as shoot fresh and dry biomasses under control and water deficit conditions. Our results revealed that water deficit negatively affected all traits; shoot fresh weight, Gs and RWC showed the highest reduction compared to the control condition. Principal component analysis (PCA) identified two PCs that accounted for 53.36% of the total variation in the water deficit conditions. Correlation analysis and PCA-based biplots showed that stress tolerance index (STI) is significantly associated with Fv/Fm and Fv/Fo under water stress conditions, suggesting that these are the best parameters to evaluate when screening for tolerant samples at the seedling stage. We identified 19 accessions from Ae. crassa and one from Ae. tauschii as the most tolerant samples. In conclusion, Ae. crassa might provide an ideal genetic resource for drought-tolerant wheat breeds