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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Supply Chain Management,Logistics,Inventory,Integrated decision making
- چکیده:
- چکیده انگلیسی: In this research, we investigate a three-stage supply chain with one supplier, several manufacturers and multiple retailers where the supplier provides a common raw material to each manufacturer, who in turn uses a single stage production facility to convert it into final products that are delivered at fixed lot sizes to retailers. An integrated economic procurement, production, and delivery model is developed whose objective is to find the common production cycle length, production sequences of final products at manufacturers and delivery frequencies of final products to retailers minimizing the total costs of considered supply chain. We propose an analytical solution procedure and an efficient heuristic solution method. The proposed heuristic solution algorithm is able to find the optimal solutions for the small and medium problem instances and consequently it is very promising for solving the large-sized instances in a reasonable time.
- انتشار مقاله: 17-01-1387
- نویسندگان: Naser Nikandish,Kourosh Eshghi,S. Ali Torabi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Medical Education and Professionalism
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی: Mentoring involves two-way communication, learning and progress. Students participating in this process receive guidance from senior students and professors on how to deal with challenges more effectively and yield suitable methods as to progress. Shiraz University of Medical Sciences (SUMS) is one of the leading universities in the field of Mentoring. The main objectives of the Mentoring program include: providing educational and emotional support for mentees. Considering the successes of the Mentoring program in Shiraz University of Medical Sciences over the past three years, we have decided to account of some of the activities carried out by Mentoring teams of this university briefly and share this experience with the other Medical schools, through this short report.
- انتشار مقاله: 05-09-1397
- نویسندگان: SULMAZ GHAHRAMANI,FATEMEH SEDDIGH,ALI REZA TORABI JAHROMI,AAZAM KHANDEL,PARISA NEMATOLLAHI,ZAHRA HASHEMPOOR,AMIRALI RASTEGAR KAZEROONI
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Dissolved oxygen,Biological wastewater treatment,Air Nanobubbles,Excess Sludge
- چکیده:
- چکیده انگلیسی: Low efficiency of conventional aeration techniques and the excessive production and disposal of sludge are great concerns in biological wastewater treatment systems. The present study aimed to evaluate the active sludge method using batch reactors under continuous operation to determine the efficiency of aeration and sludge production through microbubble and nanobubble aeration. The results indicated that compared to microbubble aeration, nanobubble aeration increased the concentration of dissolved oxygen in the mixed liqueur of the reactor (from 2 to 4.5 mg/l), while reducing the production of excess sludge from 100 to 40 ml/g (SRT: 15-40 d). With the same SRT duration, these values were within the range of 160-70 ml/g using fine-bubble aeration. According to the results, nanobubble aeration could increase the efficiency of aeration, thereby increasing the capacity of the treatment plant and reducing the costs of biological wastewater treatment.
- انتشار مقاله: 21-03-1397
- نویسندگان: Mehrdad Ahmadi,Gholamreza Nabi Bidhendi,Ali Torabian,Nasser Mehrdadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Dissolved oxygen,Biological wastewater treatment,Air Nanobubbles,Excess Sludge
- چکیده:
- چکیده انگلیسی: Low efficiency of conventional aeration techniques and the excessive production and disposal of sludge are great concerns in biological wastewater treatment systems. The present study aimed to evaluate the active sludge method using batch reactors under continuous operation to determine the efficiency of aeration and sludge production through microbubble and nanobubble aeration. The results indicated that compared to microbubble aeration, nanobubble aeration increased the concentration of dissolved oxygen in the mixed liqueur of the reactor (from 2 to 4.5 mg/l), while reducing the production of excess sludge from 100 to 40 ml/g (SRT: 15-40 d). With the same SRT duration, these values were within the range of 160-70 ml/g using fine-bubble aeration. According to the results, nanobubble aeration could increase the efficiency of aeration, thereby increasing the capacity of the treatment plant and reducing the costs of biological wastewater treatment.
- انتشار مقاله: 21-03-1397
- نویسندگان: Mehrdad Ahmadi,Gholamreza Nabi Bidhendi,Ali Torabian,Nasser Mehrdadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Applied Biotechnology Reports
- نوع مقاله: Journal Article
- کلمات کلیدی: Recombinant vaccine,Polyclonal antibody,Diphtheria,diphtheria toxin,Mutated DTxA Chain
- چکیده:
- چکیده انگلیسی: Diphtheria is a fatal disease caused by exotoxin of Corynebacterium diphtheria. This toxin consists of two chains, catalytic chain (A) and binding (B) chain. By binding chain (B), the toxin binds to its receptor on numerous body cells such as myocardial, kidney and peripheral nerve cells. After entering, catalytic chain (A) inhibits protein synthesis and finally can cause cell death. At this time, the toxoid form of diphtheria toxin is used as vaccine. The aim of this study was the immunological analysis of the mutated synthetic catalytic subunit of diphtheria toxin in laboratory animals as a vaccine candidate, in addition to polyclonal antibody production and purification against diphtheria toxin. For this purpose the Dtx recombinant protein (with two mutant: A158G and G52E) was expressed using pET28a/DtxA plasmid in E. coli Bl21DE3 host. Then, recombinant protein, as a candidate vaccine, was extracted and purified. After evaluating and confirming the protein by SDS-PAGE and western blotting, immunization carried out in laboratory animals. Finally, followed by antibody titration by ELISA, antibody purification performed as well.The mutated recombinant protein prepared from an optimized expression was extracted and purified. Then, this protein was confirmed by SDS-PAGE and western blotting. ELISA results showed a satisfactory immunization of animals by this protein. Polyclonal antibody production and purification against diphtheria toxin was performed by G protein column and confirmed by ELISA. ELISA results showed a high titer of polyclonal antibody against diphtheria toxin in animal's serum after immunization by recombinant DTx protein.
- انتشار مقاله: 08-01-1397
- نویسندگان: Mohammad Ali Arefpour Torabi,Gholam Reza Olad,Shahram Nazarian,Jafar Salimian,Samaneh Khodi,Mohamad Javad Bagheripour
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی: Background: The role of embryo transfer (ET) in the success of in vitro fertilization/intra cytoplasmic sperm injection treatment is not well understood. In the present study we classified ET technique as difficult and easy types according to certain strict criteria, and compared the pregnancy outcome of the two ET types. Methods: This study was performed retrospectively on 295 infertile patients undergoing 308 embryo transfer cycles during May 2006-March 2007 in Mashhad IVF center.These cycles were divided into two groups. Group I had an easy embryo transfer (n=248) and group II had a difficult embryo transfer (n=60). The ET was considered as easy if the catheter insertion was successfully achieved without difficulty or needed slight manipulations of speculum or outer sheath of the catheter. ET was considered as difficult if slight maneuvers did not result in successful catheter insertion, tenaculum was used, or there was a need to use rigid catheters. Observation of beating fetal heart in a gestational sac of 6-7 weeks considered as positive pregnancy. Comparison of the pregnancy outcome between both groups was performed by using Student t test and Chi-square test. The results were shown as X2±SD. P value<0.05 was considered statistically significant. Results: The differences between two groups regarding age, number of follicles ≥ 14 mm, number of retrieved oocytes, and number of transferred embryos were not significant (P>0.1). The total number of pregnancies was 55 (17.9%): 48 (19.4%) in group I and 7 (11.7%) in group II. The difference was not significant (P =0.163). Conclusion: Although the rate of positive pregnancy with easy ET was higher than difficult ET, there was no significant difference between the two groups (P =0.163). This may be due to the type of classification of easy and difficult, or fewer patients.
- انتشار مقاله: 20-02-1394
- نویسندگان: Alieh Torabizadeh,N. Moosavifar
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Ozone,reactor,sludge reduction,Oxidation of sludge,Yield coefficient
- چکیده:
- چکیده انگلیسی: The excessive biological sludge production is one of the disadvantages of aerobic process such as SBR. So the problem of excess sludge production along with its treatment , and disposal in aerobic processes in municipal and industrial waste water can be seen in many parts of the world even in our country . to solve the problem of excess sludge production , reducing in by oxidizing some of the sludge by Ozone is a suitable idea , thus reducing the biomass coefficient as well as the sewage sludge disposal. In this study, Two SBR reactors with of 20 liter being controlled by on-line system are used. After providing the steady state in the reactors, along the 8 month research sampling and testing parameters such as COD, MLSS, MLVSS, DO, SOUR, SVI, residual ozone and Yield coefficient were done. The results showed that during the solid retention time of 10 days the kinetic coefficient of Y and Kd was 0.58 (mg Biomass / mg COD) and 0.058 (1/day) respectively. At the next stage of research, different concentrations of ozone in one liter of the returned sludge to reactor were used to reduced the excess biological sludge production. The results showed that the 20 mg ozone per gram of MLSS in one liter of the returned sludge to reactor is able to reduce Yield coefficient from 0.58 to 0. 28 (mg Biomass/mg COD),In other words, the biological excess sludge by 52 % .but the soluble COD increased slightly in the effluent and the removal percentage decreased from 92 in blank reactor to 64 in test reactor. While the amount of SVI and SOUR in this consumed ozone concentration reduced 9 mgO2/h.gVSS and 20 ml/g respectively. No sludge was seen in the 25 mg ozone concentration per gram of MLSS in one liter of the returned sludge to reactor.
- انتشار مقاله: 01-05-1387
- نویسندگان: Afshin Takdastan,Naser Mehrdadi,Ali Akbar Azimi,Ali Torabian,Gholamreza Nabi Bidhendi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Nano Dimension
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,Adsorption Isotherm,Adsorption kinetic,MCM-41,Acid blue 62
- چکیده:
- چکیده انگلیسی: In this study, removal of Acid blue 62 from aqueous solution by mesoporous silicate MCM-41 modified by Aminopropyltriethoxysilane (APTES) composite was studied. Properties of synthesized composite were analyzed and confirmed by SEM, EDX and FTIR. Results show that Langmuir adsorption isotherm has the best compatibility with the results of experiments. Kinetic analysis using pseudo-first-order model, pseudo-second-order and the intra-particle diffusion model was carried out. Results also confirmed that adsorption process is compatible with the pseudo-second-order kinetic model. Thermodynamic parameters such as Gibbs free energy changes (ΔGo), Enthalpy changes (ΔHo) and Entropy changes (ΔSo) were calculated. Negative value of ΔGo and positive value of ΔHo show that adsorption of Acid blue 62 on aminated nanocomposite is a spontaneous process also endothermic.
- انتشار مقاله: 21-12-1394
- نویسندگان: Ali Torabinejad,Navid Nasirizadeh,Mohammad Esmail Yazdanshenas,Habib Allah Tayebi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Agricultural Management and Development
- نوع مقاله: Journal Article
- کلمات کلیدی: Semnan Province,Achievement,agriculture sector,growth enterprise
- چکیده: هدف از انجام این پژوهش بررسی عوامل موثر بر موفقیت بنگاههای زودبازده بود. این پژوهش از لحاظ هدف کاربردی، از لحاظ گردآوری دادهها، غیرآزمایشی و از دسته تحقیقات همبستگی است. جامعه آماری پژوهش شامل مدیران بنگاههای زودبازده کشاورزی در استان سمنان بود که از نظر بانک کشاورزی استان موفق ارزیابی شده بودند و تعداد آنها برابر1932 واحد تولیدی کشاورزی است. با استفاده از فرمول کوکران 125 نفر را بهعنوان حجم نمونه تخمین زده شد. ابزار اصلی گردآوری دادهها و اندازهگیری متغیرهای پژوهش، پرسشنامه بود. روایی ابزار پژوهش بوسیله گروهی از متخصصان احراز گردید. پایایی ابزار پژوهش با محاسبه ضریب آلفای کرونباخ برای بخشهای مختلف پرسشنامه احراز شد. نتایج بدست آمده نشان داد که 4/6 درصد بنگاهای زودبازده کشاورزی کاملاً موفق بودند و 2/79 درصد آنها موفق و 6/13 درصد آنها نسبتاً موفق بودند. بین میزان تحصیلات، سابقه کار در کسبوکار، سابقه کار کشاورزی، اندازه بنگاه، سالهای فعالیت بنگاه، تعداد افراد شاغل، ظرفیت اشتغال، میزان سرمایه اولیه، ارزش تولید فعلی، فاصله محل سکونت تا بنگاه، هزینه پرسنلی، میزان سرمایهگذاری رابطه مثبت و معنیداری وجود دارد. نتایج تحلیل رگرسیونی نشان داد که هفت متغیر میزان سرمایه اولیه، ارزش تولید فعلی، تعداد سالهای فعالیت بنگاه، تعداد افراد شاغل، اندازه بنگاه، میزان سرمایهگذاری و متغیر سابقه کار در کسبوکار در مجموع 7/47 تغییرات متغیر وابسته موفقیت بنگاه زودبازده را تبیین کردند.
- چکیده انگلیسی: Small and medium enterprises play a significant role in economic and industrial development in the developed and developing countries. The main purpose of the study was to investigate the key factors in the effective of growth enterprises. The statistical population of this study according to assessment of Agri-Bank of the Semnan Province includes the managers of enterprises in agricultural sector of Semnan Province who were evaluated as successful enterprises (1932 agricultural units). For determining the sample 125 persons were selected by using Cochran’s formula through stratified random sampling. The main tool for collecting data was questionnaire. The results indicated that 6.4% of agricultural growth enterprises were fully successful, 79.2% were successful, and 13.6% were rather successful. According to the results, there was a significant difference between the achievement levels of growth enterprises in different educational groups with confidence level of 95%. In addition, regression analysis showed that seven variables of initial capital, current production value, years of activity, number of personnel, firm size, investment amount, and business history altogether explained 47.7% of variance in the growth enterprises.
- انتشار مقاله: 22-08-1394
- نویسندگان: Farhad Lashgarara,Alireza Torabi,Maryam Omidi Najafabadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Environmental Energy and Economic Research
- نوع مقاله: Journal Article
- کلمات کلیدی: content analysis,Supply chain network design,Sustainability,Quantitative Models,Systematic literature review
- چکیده:
- چکیده انگلیسی: The purpose of this paper is to develop a systematic literature review on the subject of sustainable supply chain network design during 1990-2016, through a review of 261 papers.
In this study, qualitative technique for conducting a systematic literature review was used. To systematize and make the literature review more accurate, content analysis method was used that include data collection, coding, analysis and interpretation of data. Several tables and figures were developed to provide a better interpretation of the literature. The results show that: 1. Researches has been growing dramatically in this field, especially since 2008; 2. Most research has been conducted in five countries; 3. The most of quantitative models of SCND have published respectively in five top journals; 4. Generally, the researchers were more interested in: single-objective, linear programming, single-period, multi-product, capacity-limited facilities, multi-mode, reverse and environmental models, than other types of models and considerations; 5. In phase of modeling and solving, the authors have used more of mathematical programming (specifically MILP) and commercial solvers. The general contribution of this paper is in its addressing the topic of Sustainable Supply chain Network Design. Supply chain network design (SCND) is one of the strategic problems at the intersection of disciplines such as management, strategy, logistics, and operational research. Moreover, this work specifically contributes to understanding sustainability and identifies research gaps and characteristics of the scientific papers on this topic.- انتشار مقاله: 15-02-1398
- نویسندگان: Ezzatollah Asgharizadeh,S. Ali Torabi,Ali Mohaghar,Mohammad Ali Zare-Shourijeh
- مشاهده