در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Energy Management and Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Optimal allocation,energy storage systems,Demand Response Program,Load management,Smart distribution network
- چکیده:
- چکیده انگلیسی: Demand response program (DRP) and energy storage systems (ESSs) are two main tools for load management in smart grids. They can make distribution networks more reliable without costly upgrades for substation constructing or lines reinforcement. This work proposes an optimization framework of optimal sitting and sizing of ESSs in a smart distribution network in the presence of DRP and considering renewable energy sources (RESs) effects and network constraints. The proposed objective function includes two terms: 1) minimization of total investment costs of ESSs; 2) minimization of active losses cost and the power purchased from upstream grid and diesel generators. DRP can reduce operation costs by shifting an amount of loads from hours with high demand to hours with lower demand and so can reduce network losses and help in peak load shaving process. In order to solve the proposed optimization model, a mixed-integer non-linear programming (MINLP) model is constructed and solved using DICOPT solver by GAMS optimization software. A modified 33-bus distribution network is considered and the results of three different cases are compared. Finally it can be noted that total cost of network in case 2, with optimal ESS allocation is reduced by 4.9% with compare to the base case, while this reduction is about 20% in case 3 with considering DRPs beside ESS allocation.
- انتشار مقاله: 15-05-1397
- نویسندگان: Alireza Akbari-Dibavar,Sayyad Nojavan,Kazem Zare
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Computational Applied Mechanics
- نوع مقاله: Journal Article
- کلمات کلیدی: Microstructure,optimization,microhardness,HIGH EFFICIENCY DEEP GRINDING
- چکیده:
- چکیده انگلیسی: The grinding is one of the most important methods that directly affects tolerances in dimensions, quality and finished surface of products. One of the major problems in the material removal processes specially grinding is the heat generation during the process and the residual tensile stress in the surfaces of product. Therefore, optimization of High Efficiency Deep Grinding (HEDG) process is the main goal of this study to reduce the generated heat and residual tensile stress and increase strength and surface hardness of AISI1045 annealed steel. To this end, the effects of main parameters e.g. depth of cut, wheel speed, workpiece speed and cross feed on surface hardness has been investigated. The experimental results demonstrated the reduction in surface temperature and increase in hardness as optimum conditions are applied to the grinding process. Moreover, the experimental results were validated by comparing with other experimental results and analyzing of surface microhardness, surface temperature and normal and tangential forces.
- انتشار مقاله: 10-05-1396
- نویسندگان: Hamid Reza Fazli Shahri,Ali Akbar Akbari,Ramezanali Mahdavinezhad,Ali Solati
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Computational Applied Mechanics
- نوع مقاله: Journal Article
- کلمات کلیدی: Microstructure,optimization,microhardness,HIGH EFFICIENCY DEEP GRINDING
- چکیده:
- چکیده انگلیسی: The grinding is one of the most important methods that directly affects tolerances in dimensions, quality and finished surface of products. One of the major problems in the material removal processes specially grinding is the heat generation during the process and the residual tensile stress in the surfaces of product. Therefore, optimization of High Efficiency Deep Grinding (HEDG) process is the main goal of this study to reduce the generated heat and residual tensile stress and increase strength and surface hardness of AISI1045 annealed steel. To this end, the effects of main parameters e.g. depth of cut, wheel speed, workpiece speed and cross feed on surface hardness has been investigated. The experimental results demonstrated the reduction in surface temperature and increase in hardness as optimum conditions are applied to the grinding process. Moreover, the experimental results were validated by comparing with other experimental results and analyzing of surface microhardness, surface temperature and normal and tangential forces.
- انتشار مقاله: 10-05-1396
- نویسندگان: Hamid Reza Fazli Shahri,Ali Akbar Akbari,Ramezanali Mahdavinezhad,Ali Solati
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Pharmaceutical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Ulcerative colitis,Cost-effectiveness analysis,Economic Evaluation,Infliximab,Conventional treatments,Incremental cost-effectiveness ratio
- چکیده:
- چکیده انگلیسی: The aim of this study is to assess cost-effectiveness of infliximab, compared with conventional treatments in patients with moderate to severe Ulcerative Colitis (UC) in Iran. We developed an analytical decision model with a 5-year-time horizon to follow up 1000 hypothetical patients, in order to estimate treatment costs and outcomes. Hypothetical patients, were individuals with moderate to severe UC, that are resistant to conventional treatments. Remission rate, clinical response, and surgery, were selected as clinical outcomes. For estimating QALY, utility value related to each state, drive form published paper. We also estimated associated probabilities by using patients ’medical records and specialists’ opinion. Costs of treatment such as: Physician visit fee, laboratory tests, hospitalizations, surgery, and drugs were estimated based on the public sector tariffs and drug price list that set by pricing committee of food and drug administration. Infliximab costs at dosage of 5 mg /kg, were considered for UC patients with average weight of 75 kilogram. Incremental Cost-Effectiveness Ratio (ICER) of infliximab treatment in UC patients were 240,903 USD dollars per QALY gained, compared with conventional treatments. According to recommendation of World Health Organization for choosing cost-effective intervention, interventions with relative cost-effectiveness value less than 3 times of Gross Domestic Production (GDP) per capita, are cost–effective. Our result showed that the ICER value of infliximab, is approximately 51 times of Iran’s local GDP per capita, in 2014 – i.e. more than 3 time GDP per capita. Thus, for UC patients, our finding indicates, infliximab, is not a cost- effective treatment.
- انتشار مقاله: 30-07-1394
- نویسندگان: Najmeh Moradi,Shahram Tofighi,Marzieh Zanganeh,Ali Akbari Sari,Hossein Khedmat,Leila Zarei
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Catalysis
- نوع مقاله: Journal Article
- کلمات کلیدی: Organocatalyst,Baylis–Hillman reaction,Aqueous conditions,Room-tempearture
- چکیده:
- چکیده انگلیسی: A new organocatalyzed method is developed for Baylis–Hillman reactions of cyclohex-2-enone with various aromatic aldehydes in the presence of water and catalytic quantities of triethylamine. All reactions take place at room temperature and relatively good yields of various products are obtained within a time frame which does not exceed 24 hours. The mild reaction conditions used in the present method and the versatility of the process are the main advantages of this procedure. As a result, products of the Baylis–Hillman reaction of cyclohex-2-enone with various aromatic aldehydes bearing electron withdrawing and electron releasing groups are obtained under inexpensive organocatalytic conditions.
- انتشار مقاله: 24-04-1394
- نویسندگان: Mohammad Saeed Abaee,Ali Akbari,Mohammad Majid Mojtahedi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Catalysis
- نوع مقاله: Journal Article
- کلمات کلیدی: BF3.SiO2,Nano-BF3.SiO2,Thioacetal,Thioacetalization,Trans-thioacetalization,Protecting group
- چکیده:
- چکیده انگلیسی: Nano-silica supported boron trifluoride (BF3.SiO2) is an efficient, reusable and eco-friendly catalyst for chemoselective thioacetalization of aldehydes and ketones. So, this catalyst was applied for transthioacetalization of acetals and acylals into their corresponding 1,3-dithiolanes or 1,3-dithianes in good to excellent yields. The reactions were carried out at room temperature under solvent free and grinding conditions in 1.5-2.5 minutes.
- انتشار مقاله: 22-07-1390
- نویسندگان: Bi Bi Fatemeh Mirjalili,Abdolhamid Bamoniri,Ali Akbari
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Single-crystal X-ray diffraction,four-coordinate,1D copper(I) coordination Polymer,Microparticles
- چکیده:
- چکیده انگلیسی: In this research, 1D four-coordinate copper(I) coordination Polymer [Cu(Clba2-1,2-pn)(NCS)]n (1) with thiocyanate anion as bridging ligand, where Clba2-1,2-pn = N,Nʹ-bis(2,4-chlorobenzylidene)propane-1,2-diamine), was synthesized by slow evaporation of solvent at room temperature and characterized by elemental analysis (CHN) and single-crystal X-ray diffraction. Microparticles of 1 were prepared by an ultrasonic bath assisted synthesis and characterized
by Scanning Electron Microscopy (SEM) and elemental analysis. Thermal stability of 1 was studied by ThermoGravimetry (TG) and Differential Thermal Analysis (DTA). The structure of 1 consists of 1D polymeric chain in which copper(I) ions are bridged by two thiocyanate groups in an end-to-end fashion, with Cu×××Cu separation 5.686(4) Å.- انتشار مقاله: 13-09-1396
- نویسندگان: Aliakbar Dehno Khalaji,Seyyed Javad Peyghoun,Ali Reza Akbari,Nourollah Feizi,MichalMichal Dusek,Vaclav Eigner
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Community Based Nursing and Midwifery
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,palliative care,Educational Needs Assessment
- چکیده:
- چکیده انگلیسی: Background: By acceptance of palliative care as a part of health system of each country and due to increasing prevalence of cancer, special focus on stakeholder’s educational needs is of vital importance so that palliative care services are improved and the quality of life of patients is enhanced. This study was conducted to explore the educational needs of stakeholders of palliative care for cancer patients in Iran.Methods: This qualitative study with 20 semi-structured interviews was conducted from August 2016 to February 2017 in Shohadaye Tajrish and Emam Khomeini Hospitals of Tehran. Participants were selected through purposive sampling and included cancer patients and their family caregivers as well as healthcare providers, experts and policy-makers. The data were analyzed through Conventional Content Analysis of Landman and Graneheim using MAXQDA10 software. Statements of each main category of the study were summarized in SWOT categorizes.Result: A total of 546 codes were extracted from the analysis of the interviews and four main categories and four subcategories were identified. The four main identified categories included:”academic education planning”, “workforce education”, “public awareness”, and “patient and caregiver empowerment” that contained our subcategories as follows: “strengths”, “weaknesses”, “opportunities” and “threats” (SWOT).Conclusion: Meeting the educational needs of the stakeholders of palliative care requires policy-makers to identify the factors leading to strategies that are based on the use of opportunities, the removal of weaknesses, and coping with the threats to which the organization is faced.
- انتشار مقاله: 24-05-1396
- نویسندگان: Mojgan Ansari,Maryam Rassouli,Mohamad Esmaiel Akbari,Abbas Abbaszadeh,Ali Akbari Sari
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Community Based Nursing and Midwifery
- نوع مقاله: Journal Article
- کلمات کلیدی: uncertainty,Aged,Renal dialysis
- چکیده:
- چکیده انگلیسی: Background: The chronic kidney disease is a major health concern. The number of the elderly people with chronic renal failure has increased across the world. Dialysis is an appropriate therapy for the elderly, but it involves certain challenges. The present paper reports uncertainty as part of the elderly experiences of living with hemodialysis.Methods: This qualitative study applied Max van Manen interpretative phenomenological analysis to explain and explore experiences of the elderly with hemodialysis. Given the study inclusion criteria, data were collected using in-depth unstructured interviews with nine elderly undergoing hemodialysis, and then analyzed according to Van Manen 6-stage methodological approach. Results: One of the most important findings emerging in the main study was “uncertainty”, which can be important and noteworthy, given other aspects of the elderly life (loneliness, despair, comorbidity of diseases, disability, and mental and psychosocial problems). Uncertainty about the future is the most psychological concerns of people undergoing hemodialysis.Conclusion: The results obtained are indicative of the importance of paying attention to a major aspect in the life of the elderly undergoing hemodialysis, uncertainty. A positive outlook can be created in the elderly through education and increased knowledge about the disease, treatment and complications.
- انتشار مقاله: 17-08-1394
- نویسندگان: Robab Sahaf,Ehteram Sadat Ilali,Hamid Peyrovi,Ahmad Ali Akbari Kamrani,Fatemeh Spahbodi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Pediatrics
- نوع مقاله: Journal Article
- کلمات کلیدی: children,Developing countries,Developed Countries,Costs,Acute Lymphocytic Leukemia
- چکیده:
- چکیده انگلیسی: Background
Pediatric acute lymphoblastic leukemia (ALL) is the most common, yet curable childhood malignancy within the pediatric cancers; but in most developed and developing countries cost of cancer treatment in children with ALL is high. So, we specified the range of expenses for the treatment of pediatric cancer and compared the results in developed and developing countries.
Materials and Methods
To evaluate treatment costs in childhood ALL, a review was taken place through published papers during the years 2000 to 2015. We searched multiple well known databases such as Medline, Scopus, ISI Web of Science and Google Scholar on January 2015 with "cost effectiveness", "cost utility", "cost minimization", "cost analysis", "economic evaluation", "childhood", "acute lymphoblastic leukemia", and "ALL" as our keywords.
Results
Regarding the reviewed evidence the essential result was that the total costs for treatment of pediatrics ALL in developing countries such as Asian countries were considerably lower than the costs reported from high income countries in Europe and North America. So different protocols were performed to treat ALL and this matter was significant due to the different durations of hospitalization.
Conclusion
According to the results, the total costs for treatment of pediatrics ALL in developing countries were considerably lower than the costs reported from high income countries.- انتشار مقاله: 08-08-1395
- نویسندگان: Hadi Hayati,Abbas Kebriaeezadeh,Mohammad Ali Ehsani,Shekoufeh Nikfar,Ali Akbari Sari,Mehdi Troski,Bereket Molla Tigabu
- مشاهده