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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: 3,crystal structure,2,Binuclear palladium(II) complex,1-Methyl-1H-1,4-tetrazole-5-thiol,Mizoroki-Heck reaction
- چکیده:
- چکیده انگلیسی: A new binuclear paddle-wheel palladium(II) complex of [Pd2(μ-mtzt)4]dmgH2 (1) has been prepared by the treatment of PdCl2 in acetonitrile with mixture of 1-methyl-1H-1,2,3,4-tetrazole-5-thiol (Hmtzt) and dimethylglyoxime (dmgH2) in methanol. Resulted complex was characterized by elemental analysis (CHNS), IR, UV–Vis absorption, 1H NMR spectroscopy and its structure was determined with single-crystal X-ray diffraction. Single crystal analysis reveals that this complex has binuclear structure in a paddle-wheel fashion with Pd-Pd distances of 2.808(2)Å. Also, in this binuclear complex, each palladium(II) ion has a slightly distorted square-pyramidal coordination geometry with the two nitrogen and two sulfur atoms in equatorial positions from four bridges mtzt- ligands and the second palladium subunit in axial position. Catalytic potentiality of complex 1 is also exhibited in the Mizoroki–Heck coupling reactions between a range of aryl halides and olefins. The catalyst shows very much efficient reactivity in the Mizoroki–Heck reactions giving high yield of the coupling products.
- انتشار مقاله: 10-06-1398
- نویسندگان: Vahid Amani,Akram Sadat Delbari,Ali Akbari,Mohammad Reza Poor Heravi,Mojtaba Amini
- مشاهده
- جایگاه : پژوهشی
- مجله: Quarterly Journal of Applied Chemical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: BF3.SiO2,Insecticidal activity,Octahydroquinazolinone
- چکیده:
- چکیده انگلیسی: A simple method for the synthesis of octahydroquinazolinone derivatives in the presence of BF3.SiO2 and Insecticide activity of these compounds against spodoptera litura was investigated to be comparable to commercial pyrethroid insecticides, Cypermethrin and Cyhalothrin. The structure of the isolated compounds was characterized by 1HNMR and FT-IR spectroscopy.The proposed method had some advantages such as high yield, mild reaction condition, ease of operation and workup, high product purity and green process.
- انتشار مقاله: 19-08-1394
- نویسندگان: Ali Akbari,Asghar Hosseini-Nia
- مشاهده
- جایگاه : پژوهشی
- مجله: Polyolefins Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Membrane fouling,Glass Fiber,Abrasion,Polyethylene,thermally induced phase separation (TIPS)
- چکیده:
- چکیده انگلیسی: Grinded glass fiber (GGF) embedded high density polyethylene (HDPE) membranes were prepared via thermally induced phase separation method. FESEM images showed that all the membranes had leafy structure, indicating a solid-liquid mechanism during phase separation. The results of EDX and TGA analyses confirmed that the fibers were dispersed in the HDPE matrix uniformly. Normalized water flux of the membranes increased from 1 for the neat HDPE membrane to more than 4 for 10 wt% GGF/HDPE membrane. Moreover, the contact angle decreased from 129° to 94° as the GGF content increased in the membranes, showing an improvement in the surface hydrophilicity of the membranes. The AFM results revealed that the surface roughness of the membranes was increased with increasing the GGF content. The results of abrasion test revealed that the GGF/HDPE membranes had a more abrasion resistance than the neat HDPE membrane. Finally, the fouling behavior of the membranes was investigated by the filtration of BSA protein solution and the results showed that with increasing the glass fiber content, total fouling ratio decreased from 90% for the neat HDPE membrane to 62% for 10 wt% GGF/HDPE membrane, indicating that the antifouling properties of the membranes were improved due to the presence of glass fiber.
- انتشار مقاله: 21-06-1395
- نویسندگان: Ali Behboudi,Yoones Jafarzadeh,Reza Yegani,Ali Akbari
- مشاهده
- جایگاه : پژوهشی
- مجله: Progress in Biological Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Growth,age,Length-Weight Relationship,Periophthalmus waltoni,Qeshm Island and Bandar-Abbas
- چکیده:
- چکیده انگلیسی: In order to determine the age structure, growth, and length-weight relationship of the mudskipper, Periophthalmus waltoni, from coastal mudflats of Qeshm Island, Soroo and Bandar-pol, in Hormuzgan Province, Iran, we collected 192 individuals in February 2007. Age was determined using the second pectoral radial bone and year class was based on length-frequency distributions. Growth was described by the von Bertalanffy growth model. For Bandar-Pol mudskippers, = 141.51 mm, k = 0.46 year-1, and t0 = 0.79 year. For Qeshm mudskippers, = 166.79 mm, k = 0.42 year-1, and t0 = 0.62 year. Overall, males grew larger than females ( = 208 mm vs. 147 mm), while females grew faster (k = 0.41 vs. 0.19 year-1). The age when the theoretical length was 0 (t0) was 1.46 year for males and 0.88 for females. Maximum age was estimated to be 4+ years.
- انتشار مقاله: 11-10-1348
- نویسندگان: Jaleh Sarafraz,Asghar Abdoli,Bahram Hassanzadeh,Ehsan Kamrani,Mohamad Ali Akbarian
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Modern Processes in Manufacturing and Production
- نوع مقاله: Journal Article
- کلمات کلیدی: Design of experiment,Honing,Cast iron cylinder,Honing parameter
- چکیده:
- چکیده انگلیسی: Honing is a process for finishing surfaces to obtain smooth surface. This process is used for final polish of inner parts such as engines cylinders. Optimizing this process has always been a big challenge for mass production of cylinder blocks of internal combustion engines. Honing process has some variable parameters, thus to get their optimum rates the automobile cylinders were tested. In this research, experiment design was done using Taguchi method and to make input constant parameters of the test consistence, cylinder was bored using boring machine and in the next phase, cylinder was honed according to the design of experiment. Abrasive particles were selected from the material of carbide silicone stone and the variable parameters considered in this test were tangential speed, grain size, and the number of tools course. In order to measure surface quality of each cylinder, roughness tester machine was used and surface quality considered as output parameters of machining. Then, the results of the test were studied and analyzed on software environment. According to the tests conducted, the optimum values of mesh stone of honing and optimum values of numbers related to the course number and rotation were identified on the best state.
- انتشار مقاله: 13-07-1394
- نویسندگان: Saeed Saki Entezami,Masoud Farahnakian,Ali Akbari
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Optimization in Industrial Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Social Responsibility,Stackelberg game,Green Supply Chain Management,Tax Rate
- چکیده:
- چکیده انگلیسی: In this research, firms aim at maximizing two purposes of social welfare (environment) and profitability in the supply chain system. It is assumed that there are two supply chains, a green and an ordinary, each consists of a manufacturer and a supplier; in which the manufacturer generates profit through franchises. The green and the ordinary manufacturers form a cartel on the market of a certain product with the goal of increasing their mutual profits and maintaining a certain level of social welfare, while the government, as a leader, intervene financially using tax rates and incentives. We formulate the problem as a Stackelberg game model seeking the equilibrium solutions. A numerical example is presented and a sensitivity analysis is carried out. The results show that the investment’s encouraging tax rate in green technology has no impact on the optimal production of the green and ordinary manufacturers. Therefore, it is not an affective variable on the product market, but it is an important variable for the state utility function. Another highlight is that if tax rates are not equal for green and ordinary goods, then either the green or the ordinary producer will be withdrawn from the market. The most important result of this study is that if the government wants to maximize its utility function when the final product’s market is facing with a cartel and the price collusion between the green and ordinary producer, it should realize the equality between the ordinary and green tax rate and there is no difference between these two parameters of the government's decision. If the government is willing to keep the green producer in the market, the optimal and absolute tax rate of green chain is obtained by assuming zero profit of the green manufacturer.
- انتشار مقاله: 07-12-1395
- نویسندگان: Amir Hossein Yazdanpanah,Ali Akbar Akbari,Marzieh Mozafari
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: دینامیک سیالات محاسباتی,میکروکانال,عدد ناسلت,نانوذره,دندانههای نیمه -چسبان- نیمه ناقص
- چکیده:
- چکیده انگلیسی:
In this numerical study the the heat transfer and laminar nanofluid flow in the three-dimensional microchannels with triangular cross-section is simulated. For increase the heat transfer from the walls of the channel, semiattached & offset mid- truncated rib,s Placed in the canal, and the tooth geometry and the impact is studied. In this study, the water is base fluid, and the influence of the volume fraction of nanoparticles of titanium oxide on the the heat transfer and the fluid flow physics is studied. The presented results include the distribution of Nusselt number in the channel, The coefficient of friction and the thermal-fluid performance for each of the different states. The results show the existence of is the tooth on the effective flow physics. And their efficacy is highly dependent on Reynolds number. Use indentation in the microchannels, increase the heat transfer rate and the reduce the temperature gradient between the layers of the cooling fluid. Also, the presence of nanoparticles in the fluid cooling is effective and the pain increase the heat transfer by increasing the Reynolds number, the effect of nanoparticles also increase the heat transfer increases.- انتشار مقاله: 08-09-1394
- نویسندگان: Mousa Heydari,Davood Toghraie,Omid Ali Akbari
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: میکروکانال دندانهدار,نانوسیال,انتقال حرارت,ضریب اصطکاک
- چکیده:
- چکیده انگلیسی: در تحقیق حاضر در مورد اثرات ارتفاع دندانه در میکروکانال دندانهدار دو بعدی، بر روی پارامترهای انتقال حرارت و دینامیک سیالات محاسباتی جریان آرام نانوسیال آب-اکسید آلومینیم است. بررسیهای این تحقیق به صورت عددی با نرم افزار تجاری فلوئنت3/6 برای اعداد رینولدز10 و 100، برای چهار حالت مختلف ارتفاع دندانه انجام شده است. افزایش ارتفاع دندانههای داخلی یا مغشوشگرهای جریان، عملکرد انتقال حرارت جابجایی در میکروکانال را به میزان قابل توجهی افزایش میدهد. مشاهده میشود که نرخ انتقال حرارت در میکروکانال با افزایش ارتفاع دندانه و افزایش کسر حجمی نانو ذرات، بهبود مییابد. اما افزایش ارتفاع دندانه، باعث افزایش ضریب اصطکاک بزرگتر در مقایسه با میکروکانال با ارتفاع دندانه ثابت است. در این تحقیق برای همه حالات مختلف ارتفاع دندانه، تأثیر ارتفاع دندانه بر روی پارامترهای جریان سیال بررسی شده است. نتایج در قالب پروفیلهای سرعت و دما، عدد ناسلت و کانتورهای تابع جریان و خطوط هم دما ترسیم می-شوند......
- انتشار مقاله: 08-09-1394
- نویسندگان: Davood Toghraee,Arash Karimipour,OmidAli Akbari,Majid Zaringhalam,Habibolah Alipour
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: heat exchanger,Nanofluid,increase heat transfer
- چکیده:
- چکیده انگلیسی: Heat Transfer has special importance in engineering applications. So, researchers have suggested different new idea to increase heat transfer and using nanofluid is one of these methods In recent years, new methods have been used. One of these methods is the use of nanofluids, ., because nanofluids have higher heat transfer potential than base conventional fluids. In this investigation effect of suspended CuO nanoparticles with volume fraction of 0.005 into base water fluid is considered under turbulent flow regime inside double tube counter heat exchanger. It was observed that suspending pre-mentioned amount of nanoparticle augmentate heat transfer capability of conventional water fluid. On the other side, it leads to increase pressure drop and friction factor of water base fluid. Finally they conclude that positive effect of heat transfer augmentation is so stronger than negative effect of increasing pressure drop and friction factor that motivate to utilize this nanofluid in practical applications.
- انتشار مقاله: 14-08-1394
- نویسندگان: Arash KarimiPour,Davood Toghraie,Omid Ali Akbari,Majid Zarringhalam,Gholamreza Ahmadi Sheikh Shabani
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Kerman University of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Probiotic bacteria,encapsulation,Drinking yoghurt,Fecal analysis
- چکیده:
- چکیده انگلیسی: Background & Aims: Probiotic bacteria have beneficial effects on host's health. However, one of the most important reasons which affect the probiotic activity of a microorganism is its survival during the gut transit. Microencapsulation techniques could be applied to bacteria to improve this parameter. Methods: In this study, feces of 60 healthy volunteers were analyzed during 28-day test period to assess changes of probiotic bacteria. Participants were divided into equal 4 groups; group 1 did not receive probiotic drinking yoghurt (control); group 2 received probiotic drinking yoghurt containing free Lactobacillus acidophilus and Bifidobacterium animalis, subspecies lactis; group 3 recieved the same strains microencapsulated with sodium alginate/resistant starch; and group 4 received probiotic drinking yoghurt containing microencapsulated probiotic bacteria with sodium alginate/chitosan. Results: A significant increase was recorded in the population of lactobacilli and bifidobacteria in the feces of participant in three groups at the end of the treatment compared with control group (P < 0.05 for all), confirming the ability of the 2 strains to colonize the human gut, either in a gastroprotected form or not. Participants treated with the microencapsulated bacteria reported more viability than those received not encapsulated strains. Feces of group 3 that received drinking yoghurt containing encapsulated probiotic bacteria with alginate/resistant starch had higher amount of probiotic bacterial populations, 1.3 ± 0.26 × 107 and 2.4 ± 0.37 × 109 cfu/g Lactobacillus acidophilus and Bifidobacterium animalis subs lactis, respectively. Conclusion:Consumption of the drinking yoghurts containing probiotic bacteria increased the Lactobacillus acidophilus and Bifidobacterium animalis, subspecies lactis, contents of the feces and encapsulation process improved stability of probiotic bacteria
- انتشار مقاله: 23-04-1395
- نویسندگان: Fatemeh Shahdadi,Habibollah Mirzaie,Mahdi Kashaninejad,Morteza Khomeiri,Aman Mohammad Ziaiifar,Ali Akbarian
- مشاهده