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Performance of fluoride adsorption by snail shell in aqueous
Ghorban Asgari,AbdolMotaleb Seid Mohammadi,Jamal Mehralipour,Adel Ahmadzadeh
Pajouhan Scientific Journal , 2013,
Abstract: Introduction: Fluoride in low concentration is essential for human but in high concentration is very hazardous for human health. The efficacy of Snail Shell (SS) was investigated in this research work as an adsorbent for the elimination of fluoride from aqueous.Material and Methods: In this experimental study, the capability of SS to adsorb fluoride ions was conducted using a series of batch tests in a shaker-incubator instrument. For each batch run, 100 mL of solution containing a known initial concentration of Fluoride and with the preferred level of pH was shacked. The effects of selected parameters such as pH (3-11), reaction time (5–60 min) cyanide concentrations (5–10 mg/L) and the adsorbent dosage (0.25–2.5 g/L) were investigated on the removal fluoride as a target contaminate. Chemical composition SS were analyzed using a Philips model XL-30 scanning electron microscope (SEM) with energy-dispersive X-ray microanalysis (EDX). The concentration of Fluoride in solution before and after treatment was determined using the HACH method.Results: Analysis of the SS component using the EDX technique showed that the main part of it consisted of calcium and its other components were magnesium, aluminum and silicate. The experimental data showed that the maximum fluoride removal occurred at pH of 7, adsorbent dose (0.5 g/L) and 30 min contact time and 5 mg/lit initial concentration. The kinetic evaluation indicated that the pseudo-second-order kinetic had the best fit to the experimental results predicting a chemisorption process. The equilibrium adsorption of fluoride onto SS was well represented by the Langmuir equation.Conclusion: As a result, SS was revealed as a very efficient and low-cost adsorbent and a promising option for removing fluoride from industrial wastewaters.
Removal of cyanide by eggshell as low-cost adsorbent
Ghorban Asgari,AbdolMotaleb Seid Mohammadi,Amir Shabanlo,Jamal Mehr Ali Pour
Pajouhan Scientific Journal , 2013,
Abstract: Introduction: Cyanides as carbon-nitrogen radicals are very toxic compounds and highly harmful to humans and aquatic organisms. The efficacy of eggshells (ES) was investigated in this research work as an adsorbent for the elimination of cyanide from polluted streams.Material and Methods: In this experimental study, the capability of ES to adsorb cyanide ions was conducted using a series of batch tests in a shaker-incubator instrument. For each batch run, 100 mL of solution containing a known initial concentration of cyanide and with the preferred level of pH was shacked. The effects of selected parameters such as pH (3-11), reaction time (5–60 min) cyanide concentrations (50–150 mg/L) and the adsorbent dosage (0.25–2 g/L) were investigated on the removal cyanide as a target contaminate. Chemical composition ES were analyzed using a Philips model XL-30 scanning electron microscope (SEM) with energy-dispersive X-ray microanalysis (EDX). The specific surface and pore size distributions of ES were measured via Brunauer-Emmett-Teller (BET) isotherm and Barrett-Joyner-Halenda (BJH) methods using a Micrometrics particle size analyzer. The concentration of cyanide in solution before and after treatment was determined using the titrimetric method as described in the standard methods.Results: Analysis of the ES component using the EDX technique showed that the main part of it consisted of calcium and its other components were magnesium, iron, aluminum and silicate. The experimental data showed that the maximum cyanide removal occurred at pH of 11, adsorbent dose (0.5 g/L ) and 40 min contact time. The kinetic evaluation indicated that the pseudo-second-order kinetic had the best fit to the experimental results predicting a chemisorption process. The equilibrium adsorption of cyanide onto ES was well represented by the Langmuir equation.Conclusion: As a result, ES as waste materials was revealed as a very efficient and low-cost adsorbent and a promising option for removing cyanide from industrial wastewaters.
Application of Commercial Powdered Activated Carbon for Adsorption of Carbolic Acid in Aqueous Solution
Afshin Maleki,Mohammad Bagher Khadem Erfan,Abdolmotaleb Seied Mohammadi,Roya Ebrahimi
Pakistan Journal of Biological Sciences , 2007,
Abstract: Adsorption studies for Carbolic Acid (phenol) removal from aqueous solution on commercial powdered activated carbon were carried out. Batch kinetics and isotherm studies were carried out under varying experimental conditions of contact time, initial phenol concentration, adsorbent dose and pH. Adsorption equilibrium was reached within 6 h for phenolic concentrations 100-500 mg L-1. The adsorption of phenol increases with increasing initial phenol concentration and decreases with increasing the solution pH value. The equilibrium data in aqueous solutions was well represented by the Langmuir and Freundlich isotherm models. Kinetics of adsorption followed a first order rate equation. The studies showed that the palm seed coat carbon can be used as an efficient adsorbent material for the removal of phenolics from water and wastewater.
Effect of Zinc Sulfate Supplementation on Lipid and Glucose in Type 2 Diabetic Patients
Mohammad Afkhami - Ardekani,Mahdi Karimi,Seid Mohammad Mohammadi,Forough Nourani
Pakistan Journal of Nutrition , 2008,
Abstract: Type 2 diabetes mellitus is a chronic, progressive illness that causes considerable morbidity and premature mortality. More people are still having tendency to use herbal or alternative remedies. Zinc is a trace mineral which may be effective in diabetic patients. We evaluated the effect of zinc sulfate on biochemical markers of type 2 diabetic patients. In a randomized, controlled trial on diabetic subjects, forty patients received randomly either 660mg zinc sulfate or placebo for six weeks. Body Mass Index, Blood Pressure, Fasting Blood Sugar, 2-h postprandial glucose, Glycated hemoglobin, Triglyceride, cholesterol, low - density lipoproteins, high - density lipoproteins were checked before and six weeks after beginning of the study. HbA1C, BMI and Blood Pressure were measured after 12 weeks to evaluate the long term effect of drugs. The mean age of patients was 52.67±8.60. level of FBS, 2HPP, HbA1C decreased after six week treatment with zinc sulfate but it was not statistically significant. Due to zinc sulfate administration, significant decrease occurred in TG (P=0.005), chol (p=0.02), LDL (0.01) and systolic blood pressure (p=0.02). HDL was increased but it was not significant. No statistically significant differences were found prior to and after zinc treatment in BMI and diastolic blood pressure. After 12 weeks, there was a significant decrease in HbA1C (P=0.04) with zinc sulfate consumption. Zinc sulfate consumption in addition to other nutritional and pharmacological treatments in type 2 diabetic patients could be effective in lipid profile.
COMPARISON OF DIFFERENT ADVANCED OXIDATION PROCESSES DEGRADING P-CHLOROPHENOL IN AQUEOUS SOLUTION
H. Movahedyan ? A. M. Seid Mohammadi ? A. Assadi
Iranian Journal of Environmental Health Science & Engineering , 2009,
Abstract: In present study, degradation of p-chlorophenol using several oxidation systems involving advanced oxidation processes such as ultraviolet/H2O2, microwave/H2O2 and both in the absence of hydrogen peroxide in batch mode by photolytic pilot plant and modified domestic microwave oven was evaluated. The oxidation rate was influenced by many factors, such as the pH value, the amount of hydrogen peroxide, irradiation time and microwave power. The optimum conditions obtained for the best degradation rate were pH=7 and H2O2 concentration of 0.05 mol/L for ultraviolet/H2O2 system and pH=10.5, H2O2 concentration of about 0.1 mol/L and microwave irradiation power of about 600W for microwave/H2O2 system at constant p-chlorophenol concentration. The degradation of p-chlorophenol by different types of oxidation processes followed first order rate decay kinetics. The rate constants were 0.137, 0.012, 0.02 and 0.004/min1 for ultraviolet/H2O2, microwave/H2O2, ultraviolet and microwave irradiation alone. Finally a comparison of the specific energy consumption showed that ultraviolet/H2O2 process reduced the energy consumption by at least 67% compared with the microwave/H2O2 process.
The Impact of Matrix Treatment (Family Training) in Reducing the Amount of Drug Consumption in Heroin and Crack Addicts  [PDF]
Seyyed Hossein Seid, Narges Dolatyari
Health (Health) , 2015, DOI: 10.4236/health.2015.74048
Abstract: The purpose of this study is to investigate the impact of family training based on matrix model in reducing the amount of drug consumption by heroin and crack addicts. The subjects were referral to Karaj Clinic, Karaj City, Iran, for crack abuse in 2013. In order to select participants convenience sampling was been used and totally 45 patients were selected (15 heroin addict, 15 crack addict, and 15 with combination of heroin and crack addiction) and put into two groups of experimental and control groups randomly. For collecting the data, Addiction Severity Index questionnaire was used. Descriptive and inferential statistics were used through one-way analysis of covariance for data analyzing. The results indicated that there was statistical difference between the experimental and control group with consumption of heroin and crack in family status, mental and substance use and also it has been shown that the experimental group with heroine consumption achieved better performance compared with the control group in the amount of consumption.
Effectiveness of Family-Based Behavioral Treatment Based on Medication Behavior Barkley Compared with Drug Therapy in Reducing the Symptoms of Children with Attention Deficit Disorder-Hyperactivity  [PDF]
Narges Dolatyari, Seyyed Hossein Seid
Health (Health) , 2015, DOI: 10.4236/health.2015.74057
Abstract: Children with attention deficit and hyper activity disorder have various problems such as low academic performance, social and communication problems, anxiety, depression, aggression, conduct disorder and delinquency, and also when they become adults, they have problems in social relationships that these problems can increase or decrease in dealing with family. Hence, this study was performed in order to examine the impact of family-based behavioral treatment compared with Barkley behavior therapy in reducing symptoms of children with attention deficit disorder—ADHD. To meet the aim, 20 of children with age range of 7 to 12 years old with attention deficit disorder—hyperactivity were selected in both experimental and control groups, and exposed to the treatment of behavioral family therapy groups and changes in behavior Barkley. Before and after the treatment, they were evaluated according to the scale of the Conner’s Parent Rating Scale-Revised Short Form (CPRS-R: S). Results of multivariate analysis of covariance indicated that there were significant differences between the experimental group who had received family-based behavioral treatments based on changes in behavior Barkley and a control group who had received drug treatment in variables, including conduct problems, learning problems, psychosomatic symptoms, and signs of impulsive hyperactivity, anxiety and hyperactivity (p < 0.01). These results could be guidance for counsel or sand therapists for children with attention deficit disorder—ADHD.
THE IMPACT OF TRADE LIBERALIZATION ON PER CAPITA INCOME: EVIDENCE FROM SUB SAHARAN AFRICA
Seid Yimer
International Journal of Economics and Research , 2011,
Abstract: Trade liberalization in Sub-Saharan Africa has been implemented in the context of Structural Adjustment Program since late 1980. However, the empirical evidence on per-capita income and growth is mixed. This paper uses dynamic panel data and three indicators of trade liberalization to examine the relationship between trade liberalization and real per-capita income for Sub-Saharan African countries. The study finds that trade share has positive impact on per-capita income while tariff rates are negatively associated with per-capita income. Even if these openness indicators maintained the expected sign, they have insignificant effect on percapita income. However, the liberalization dummy variable has positive and significant effect on per-capita income and the result is consistent and robust to changes in specifications and sample sizes.
DETERMINANTS OF FOOD CONSUMPTION EXPENDITURE IN ETHIOPIA
Seid Yimer
International Journal of Economics and Research , 2011,
Abstract: This study uses the 2004/05 household income and consumption expenditure survey to examine the determinants of household teff expenditures by using heteroskedastic double-hurdle model to accommodate zero observations in the sample. Mostly importantly, the study also calculates elasiticties parameters for the explanatory variables to examine their effect on teff consumption. The double hurdle model for teff consumption suggested that age of head of the household was determining the level of consumption while it was not important to influence the household’s decision to consume. The estimated results indicated that sociodemographic characteristics (household sizes, dependency ratios, education, employment status, gender) were significant in explaining both the decision to consume and the level of teff consumption. In addition, economic factors such as income and prices were among the significant determinants of teff consumption demand. Calculated own price elasiticties for the main regions indicated that Addis Ababa was relatively less sensitive to changes in teff prices. Finally, Tobit model was used to observe consumption patterns for maize, sorghum wheat and teff. Income and education were positively and significantly affecting teff expenditures while they were negatively associated with maize consumption. Educated head of the household had remarkably low consumption of maize and sorghum
Stochastic maximum principle for optimal control problem of backward systems with terminal condition in L1
Seid Bahlali
Mathematics , 2008,
Abstract: We consider a stochastic control problem, where the control domain is convex and the system is governed by a nonlinear backward stochastic differential equation. With a L1 terminal data, we derive necessary optimality conditions in the form of stochastic maximum principle.
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