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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Progress in Color, Colorants and Coatings
- نوع مقاله: Journal Article
- کلمات کلیدی: Antibacterial,Mechanical properties,Surface properties,Magnetron sputtering,Cu: amorphous-C: N,Thin coating
- چکیده:
- چکیده انگلیسی: Ti-6Al-4V alloy, also called TC4, substrates are sputter-deposited by Cu: amorphous-C: N (Cu:a-C:N) thin coatings using planar magnetron sputtering physical vapor deposition device. Mixtures of argon and nitrogen at different ratios are selected as the sputtering atmosphere, and no hydrocarbon gas is used. Correlation of microstructure, morphology, surface properties, antibacterial characteristics, and mechanical performance of the coatings to the N2/Ar ratio are discussed. The outcomes from Raman spectroscopy confirm the construction of the DLC (Diamond Like Carbon) phase in the microstructure of the coatings. The thin coatings synthesized at higher N2/Ar ratios show more increased amount of sp 3 hybridization, improved wettability, higher internal stress, and enhanced mechanical properties, i.e., higher hardness. However, these are accompanied by lower antibacterial performance. Plastic hardness (H) value of the thin coatings increased from about 2 GPa to 13 GPa by increasing N2/Ar ratio. However, bacterial reduction percent of the thin coatings decreased from 100 to 65% as N2/Ar ratio increased. The resultant outcomes reveal the critical role of the N2/Ar ratio on tailoring the antibacterial properties of Cu: a-C: N thin coatings as well as mechanical ones.
- انتشار مقاله: 24-09-1399
- نویسندگان: S. Khamseh,M. Ganjaee Sari,E. Alibakhshi,M. Nemati
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Stress Analysis
- نوع مقاله: Journal Article
- کلمات کلیدی: Nano-silica,Reinforcement-concrete bond,Pull-out test,Polymer fibers,Micro-silica,Cement strength grade
- چکیده:
- چکیده انگلیسی: The present study analyzes the bond stress in steel reinforcements embedded in concrete containing polymer fibers, micro- and nano-silica particles. For this purpose, 36 cylindrical (with a diameter of 10cm and height of 15cm) and
36 cubic (10 × 10 × 10cm) specimens containing different contents of additives and three types of cement strength grade (i.e. 32.5, 42.5 and 52.5MPa) were constructed and subjected to pull-out and compressive strength tests, respectively. The experimental observations were then compared to previously proposed models available in the literature. The results indicated that microand nano-silica particles, compared to fibers, had more impacts on improving the reinforcement-concrete bond strength. Moreover, the highest bond strength was observed for the specimen containing equal content of microand nano-silica particles. An acceptable agreement was also obtained between the results of current study and previous models, highlighting the capability of the proposed models in prediction of the actual behavior of such specimens.- انتشار مقاله: 12-10-1396
- نویسندگان: A. Madadi,H. Eskandari-Naddaf,M. Nemati Nejad
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Sciences, Islamic Republic of Iran
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,earthquake,Prediction,Probabilistic,Lineament
- چکیده:
- چکیده انگلیسی: In this research seismicity parameters, repeat times and occurrence probability of large earthquakes are estimated for 35 seismic lineaments in Persian plateau and the surrounding area. 628 earthquakes of historical time and present century with MW>5.5 were used for further data analysis. A probabilistic model is used for forecasting future large earthquake occurrences in each chosen lineament. Based on the processing, it reveals that high risk (P>66%) regions in Iran for MW≥7.0 earthquake occurrence in the next 20 years are Apsheron, Main Recent Fault, Dasht-e Bayaz, Golbaf, Minab, Makran and Bandar-e Abbas areas. North Tabriz fault and Ipac, Toroud and Neyshabour fault systems, which are form the southern border between the north and central Iran, have the largest repeat times (>40 years) for 5.5≤MW<7.0 within the seismic regions in Iran. They are mainly associated with very low probabilities. Furthermore, the results show that central Iran is the calmest area for earthquake occurrence, especially in the next 20 years. The important areas for earthquake occurrence with 5.5≤MW<7.0 in the next 10 years are Talesh, Apsheron, north of Kopeh Dagh, Dorouneh and Golbaf areas. Probability of occurrence of an earthquake in the next 10 years in Alborz including capital and important industrial cities with combined population of 15,000,000 is up to 66%.
- انتشار مقاله: 12-10-1395
- نویسندگان: M. Nemati,M. Nemati,M. Nemati
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Sciences, Islamic Republic of Iran
- نوع مقاله: Journal Article
- کلمات کلیدی: aftershock,Mainshock,Magnitude,Seismicity and Persia
- چکیده:
- چکیده انگلیسی: This paper focuses on aftershocks behavior and seismicity along some co-seismic faults for large earthquakes in Iran. The data of aftershocks and seismicity roughly extracted from both the Institute of Geophysics the University of Tehran (IGUT) and International Seismological Center (ISC) catalogs. Apply some essential methods on 43 large earthquakes data; like the depth, magnitude as well as the aftershock data; resulted knowledge about some relations between earthquake characteristics. We found ~16.5km for deep seated co-seismic fault length for the 2005 Dahouieh Zarand earthquake (MW 6.4) considering the dimension of the main cluster of aftershocks. Moreover, a slightly decrease in aftershocks activity was observed with increase in depth of the mainshocks for some Iranian earthquakes. Also the clustered aftershocks for the 1997 Zirkuh-e Qaen earthquake (MW 7.1) showed a clear decrease in maximum magnitude of the aftershocks per day elapsed from mainshock. Finally, we could explore an anti-correlation between aftershocks distribution and post microseismicity along co-seismic faults for both Dahouieh and Qaen earthquakes.
- انتشار مقاله: 17-04-1393
- نویسندگان: M. Nemati,M. Nemati,M. Nemati
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Sciences, Islamic Republic of Iran
- نوع مقاله: Journal Article
- کلمات کلیدی: earthquake,Focal mechanism,aftershocks,Strike-slip and Steep dipping
- چکیده:
- چکیده انگلیسی: In 2012 August 11 (12:23 UTC) a moderate earthquake with MW=6.4 (USGS) occurred between Ahar and Varzaghan towns in Azarbayjan Province at northwest of Iran. After eleven minutes another earthquake shook the area with MW=6.2 (USGS). These consecutive earthquakes followed by intensive sequences of aftershocks whereas the strongest one had MW=5.3 (USGS). In data processing including depth modification and focal mechanism solution, we used regional (Institute of Geophysics, University of Tehran (IGUT) and International Institute of Earthquake Engineering and seismology (IIEES) of Iran) and worldwide (ISC) seismological data. After processing westward fault propagation estimated using Building and House Research Center (BHRC) of Iran strong-motion records. Also depth of the mainshocks and some important aftershocks modified using pP phase travel times recorded with ISC stations (10-14 km) which are nicely situated in seismogenic part of crustal structure of the area. The focal mechanisms processed using first P motion method for the two mainshocks and dominant mechanisms calculated for the intense aftershocks (MN>4.0, IGUT) manifestly displayed a strike-slip movement on a steep south dipping nodal plane with near E-W strike without any interpretation using earthquakes location. These are associated with the Geological Survey of Iran (GSI) field observations.
- انتشار مقاله: 14-02-1392
- نویسندگان: M. Nemati,M. Nemati,M. Nemati
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Membrane Science and Research
- نوع مقاله: Journal Article
- کلمات کلیدی: TiO2 nanoparticles,composite film,Anion exchange membrane,Electrochemical characterization
- چکیده:
- چکیده انگلیسی: In the current research, polyvinylchloride based mixed matrix heterogeneous anion exchange membranes were prepared by a solution casting technique. Titanium dioxide nanoparticles were also utilized as inorganic filler additive in the membrane fabrication. The effect of TiO2 nanoparticles concentration in the casting solution on the membrane physico-chemical properties was studied. Membrane water content was decreased by an increase of nanoparticle concentration. Ion exchange capacity was also improved initially by an increase of nanoparticle content ratio and then slightly decreased. The membrane fixed ionic concentration, membrane potential, transport number and permselectivity were all increased by an increase of additive loading ratio. The membrane ionic permeability was enhanced initially by an increase of nanoparticle concentration up to 0.5 %wt in the membrane matrix and then decreased by more additive content ratio from 0.5 to 4 %wt. Membrane ionic resistance was declined by using TiO2 nanoparticles in the membrane matrix. Membranes also exhibited lower permselectivity and transport number for bivalent ions in comparison to monovalent ones. An opposite trend was found for the membrane ionic permeability. The amount of swelling in the homemade membranes was also less than 5% in thickness and negligible in length and width. Among the prepared membranes, the modified membrane containing 0.5 %wt TiO2 nanoparticles concentration showed more appropriate performance compared to the others. The obtained results revealed that modified membranes in this study are comparable with commercial membranes.
- انتشار مقاله: 10-07-1394
- نویسندگان: M. Nemati,S. M. Hosseini,E. Bagheripour,S.S. Madaeni
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Veterinary Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Milk,SCC,Blood,Fresh cow,Protected-glutamine
- چکیده: این پژوهش به هدف بررسی اثر مکمل گلوتامین محافظت شده (Gln) بر ماده خشک مصرفی (DMI)، ترکیب و تولید شیر (MY)، تعداد سلولهای سوماتیک (SCC) و برخی فراسنجههای خونی در گاوهای تازهزا انجام شد. 40 رأس گاو هلشتاین در روز زایمان (روز صفر) به 4 تیمار آزمایشی (10 رأس گاو در هر تیمار) اختصاص داده شدند. تیمارها عبارت بودند از: جیره پایه (گروه شاهد) و جیره پایه حاوی 150 (گلوتامین پایین، LG)، 250 (گلوتامین متوسط، MG) یا 350 (گلوتامین بالا، HG) گرم گلوتامین محافظت شده با فرمالدئید به ازای هر گاو در هر روز. ماده خشک مصرفی و تولید شیر از روز صفر تا 21 پس از زایش اندازهگیری شد. چربی و پروتئین شیر در روزهای 7، 14 و 21 اندازهگیری شدند و نمونههای خون در روز صفر، 7، 14 و 21 بعد از زایمان جمعآوری شدند. ماده خشک مصرفی و تولید شیر در 21 روز شیردهی (DIM) در گروه HG در مقایسه با گروه کنترل بیشتر بود (P<0.05). مصرف ماده خشک در روز 14 و 21 و تولید شیر در روز 21 شیردهی در گروه MG در مقایسه با گروه کنترل بالاتر بود (P>0.05). غلظت گلوکز در روزهای 7، 14 و 21 شیردهی در گروههای HG و MG بیشتر از گروه شاهد بود (P>0.05). شمار سلولهای بدنی در گاوهایی که گلوتامین دریافت کرده بودند نسبت به گروه شاهد در روزهای 14 و 21 شیردهی کاهش یافت (P<0.05). مکمل گلوتامین غلظت پروتئین کل و آلبومین را افزایش و بتا هیدروکسی بوتیریک اسید (BHBA)، اسیدهای چرب غیر استریفیه شده (NEFA) و آسپارتات ترانسفراز (AST) را کاهش داد (P<0.05). نتایج نشان داد که گلوتامین محافظت شده، در سطح 250 گرم/رأس/روز مکمل مناسبی برای بهبود SCC در شیر و وضعیت سلامت گاوهای تازهزای هلشتاین میباشد.
- چکیده انگلیسی: The present study was conducted to study the effect of protected-glutamine (Gln) supplementation on dry matter intake (DMI), milk yield (MY) and composition, somatic cell counts (SCC) and blood parameters in fresh cows. Forty Holstein cows at zero day of parturition (calving day = day 0) were divided into four groups (n=10), and fed (ad libitum) with one of the diets including: basal diet (control), basal diet supplemented with 150 (low Gln, LG), 250 (medium Gln, MG) or 350 (high Gln, HG) g of Gln protected with formaldehyde/cow per day. The DMI and MY were recorded from 0 to 21 days post-calving. Milk fat and protein were assessed on days 7, 14 and 21, and blood was collected on days 0, 7, 14, and 21 after parturition. The DMI and MY at 21 days in milk (DIM) in HG group were compared with control (P<0.05). The DMI at 14 and 21 DIM and the MY at 21 DIM were higher in MG group compared with control group (P>0.05). Glucose concentration at 7, 14 and 21 DIM increased in both HG and MG groups compared with control group (P>0.05). The milk SCC of Gln groups was lower (P<0.05) compared with control, at 14 and 21 DIM. Glutamine supplementation increased the blood concentrations of total protein and albumin, but lowered the β-hydoxybutyrate (BHBA), non-esterified fatty acids (NEFA) and aspartate amino transferase (AST) concentrations (P<0.05). These results indicate that rumen protected Gln supplementation at 250 g/heat/day to fresh Holstein cows improved the SCC in milk and health status.
- انتشار مقاله: 09-05-1396
- نویسندگان: M. Nemati,S. Menatian,Sh. Joz Ghasemi,R. Hooshmandfar,M. Taheri,T. Saifi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Veterinary Research
- نوع مقاله: Journal Article
- کلمات کلیدی: trace elements,Reproductive performance,Afshari ewe,Ruminal bolus,Follicle
- چکیده: تاکنون مطالعهای یافت نشده تا اثرات بلوس شکمبهای مواد معدنی را روی تعداد فولیکولهای تخمدان نشان دهد از این رو هدف از تحقیق حاضر بررسی تاثیر بلوس شکمبهای مواد معدنی روی سطوح پلاسمایی میکرومینرال، تعداد فولیکولهای تخمدان و عملکرد آبستنی میشها بود. 80 رأس میش افشاری در طی فصل تولید مثل انتخاب شده و به چهار گروه تقسیم شدند. گروه 1، یک عدد قرص فروبلوک و گروه 2، دو عدد قرص فروبلوک توسط بلوسخوران دریافت نموده، همچنین به هر دو گروه (گروه 1 و گروه 2) در روز سیدربرداری 400 واحد eCG به صورت داخل ماهیچهای تزریق شد. گروه 3، فقط 400 واحد eCG، در روز سیدربرداری به صورت داخل ماهیچهای دریافت کردند. گروه 4 گوسفندان به عنوان شاهد انتخاب شدند که eCG به آنها تزریق نشده و هیچگونه مواد معدنی هم دریافت نکردند. یک ماه قبل از شروع آزمایش قرصها به دامها خورانده شد. همه میشها تحت یک برنامه همزمانی فحلی قرار گرفته در واژن تمام میشها برای مدت 14 روز سیدر گذاشته شد. برای بررسی وضعیت فولیکولهای تخمدان در روز سیدرگذاری و روز بعد از آن، از دستگاه التراسونوگرافی استفاده شد. نتایج نشان داد که غلظت پلاسمایی مس، سلنیوم و ید هم در زمان جفتگیری و هم در روز 90 آبستنی افزایش داشته است (P<0.05). بلوس شکمبهای تأثیر معنیداری روی تعداد فولیکولهای تخمدان در کلاسهای مختلف نداشت (P>0.05). خوراندن یک یا دو بلوس شکمبهای در 4 هفته قبل از برنامه همزمان سازی فحلی باعث آبستنی تمام میشها میشود. نرخ چند قلوزایی (80%) در گروه دو بلوس در مقایسه با سایر گروهها افزایش معنیداری داشته است (P<0.05).
- چکیده انگلیسی: Published data on the effects of ruminal bolus on the number of ovulatory follicles in ewes does not exist. The present study determined the effects of a ruminal bolus on trace element status, follicular dynamics and reproductive performance in ewes. Eighty Afshari cycling ewes were synchronized during breeding season using CIDR for 14 days and assigned to 4 groups (n=20); group 1 received a single Ferrobloc bolus four weeks prior to CIDR insertion following 400 IU eCG on CIDR removal, group 2 received two boluses four weeks prior to CIDR insertion following 400 IU eCG on CIDR removal, group 3 received only 400 IU eCG on CIDR removal and group 4 (control) received no bolus and no eCG. Transrectal ultrasonography was done to monitor the ovarian follicles on the day of CIDR removal and a day later. Results showed that boluses increased the status of copper, selenium and iodine on mating day and days 90 to 100 of gestation. Ruminal bolus did not significantly increase the number of different classes of ovarian follicles in ewes fed a diet meeting all trace mineral requirements. All ewes eventually became pregnant with 1 or 2 boluses but the multiple births rate (80%) was higher (P<0.05) after 2 boluses compared to the other groups.
- انتشار مقاله: 30-10-1392
- نویسندگان: E. Abdollahi,H. Kohram,M. H. Shahir,M. H. Nemati
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Veterinary Research
- نوع مقاله: Journal Article
- کلمات کلیدی: trace elements,Reproductive performance,Afshari ewe,Ruminal bolus,Follicle
- چکیده: تاکنون مطالعهای یافت نشده تا اثرات بلوس شکمبهای مواد معدنی را روی تعداد فولیکولهای تخمدان نشان دهد از این رو هدف از تحقیق حاضر بررسی تاثیر بلوس شکمبهای مواد معدنی روی سطوح پلاسمایی میکرومینرال، تعداد فولیکولهای تخمدان و عملکرد آبستنی میشها بود. 80 رأس میش افشاری در طی فصل تولید مثل انتخاب شده و به چهار گروه تقسیم شدند. گروه 1، یک عدد قرص فروبلوک و گروه 2، دو عدد قرص فروبلوک توسط بلوسخوران دریافت نموده، همچنین به هر دو گروه (گروه 1 و گروه 2) در روز سیدربرداری 400 واحد eCG به صورت داخل ماهیچهای تزریق شد. گروه 3، فقط 400 واحد eCG، در روز سیدربرداری به صورت داخل ماهیچهای دریافت کردند. گروه 4 گوسفندان به عنوان شاهد انتخاب شدند که eCG به آنها تزریق نشده و هیچگونه مواد معدنی هم دریافت نکردند. یک ماه قبل از شروع آزمایش قرصها به دامها خورانده شد. همه میشها تحت یک برنامه همزمانی فحلی قرار گرفته در واژن تمام میشها برای مدت 14 روز سیدر گذاشته شد. برای بررسی وضعیت فولیکولهای تخمدان در روز سیدرگذاری و روز بعد از آن، از دستگاه التراسونوگرافی استفاده شد. نتایج نشان داد که غلظت پلاسمایی مس، سلنیوم و ید هم در زمان جفتگیری و هم در روز 90 آبستنی افزایش داشته است (P<0.05). بلوس شکمبهای تأثیر معنیداری روی تعداد فولیکولهای تخمدان در کلاسهای مختلف نداشت (P>0.05). خوراندن یک یا دو بلوس شکمبهای در 4 هفته قبل از برنامه همزمان سازی فحلی باعث آبستنی تمام میشها میشود. نرخ چند قلوزایی (80%) در گروه دو بلوس در مقایسه با سایر گروهها افزایش معنیداری داشته است (P<0.05).
- چکیده انگلیسی: Published data on the effects of ruminal bolus on the number of ovulatory follicles in ewes does not exist. The present study determined the effects of a ruminal bolus on trace element status, follicular dynamics and reproductive performance in ewes. Eighty Afshari cycling ewes were synchronized during breeding season using CIDR for 14 days and assigned to 4 groups (n=20); group 1 received a single Ferrobloc bolus four weeks prior to CIDR insertion following 400 IU eCG on CIDR removal, group 2 received two boluses four weeks prior to CIDR insertion following 400 IU eCG on CIDR removal, group 3 received only 400 IU eCG on CIDR removal and group 4 (control) received no bolus and no eCG. Transrectal ultrasonography was done to monitor the ovarian follicles on the day of CIDR removal and a day later. Results showed that boluses increased the status of copper, selenium and iodine on mating day and days 90 to 100 of gestation. Ruminal bolus did not significantly increase the number of different classes of ovarian follicles in ewes fed a diet meeting all trace mineral requirements. All ewes eventually became pregnant with 1 or 2 boluses but the multiple births rate (80%) was higher (P<0.05) after 2 boluses compared to the other groups.
- انتشار مقاله: 30-10-1392
- نویسندگان: E. Abdollahi,H. Kohram,M. H. Shahir,M. H. Nemati
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی: Background: Atrial fibrillation (AF) is one of the most common arrhythmias after coronary artery bypass graft (CABG) surgery. AF can result in hemodynamic instability, thromboembolic events, increase the perioperative myocardial infarction, congestive heart failure, stroke, more length of hospital stay (LOHS) and cost of treatment. The aim of this study was to evaluate the independent effect of digoxin in preventing AF after CABG in patients who had a predictor for AF and had already been on other anti-arrhythmic drugs. Methods: In a prospective randomized clinical trail, using alternate randomization, 239 patients categorized into three different groups. Group one consisted of 72 patients who had at least one predictor for developing AF after CABG. Group two consisted of 67 patients with the same predictors who received 0.5 mg intravenous digoxin after disconnecting from bypass pump followed by 0.25 mg intravenous digoxin one hour and four hours later. Oral daily digoxin (0.25 mg) was continued from the first post operation day to the 14th day with 2 days off per week. One hundred patients without those predictors for AF were randomly allocated in group three to confirm the impact of those predictors on developing AF. Results: AF occurred in 16 patients (22.2%) in group 1, six patients (8.8%) in group 2, and seven patients (7%) in group 3. The duration of AF was 6.43±4.23 min in group 1, 1.2±1.41min in group 2, and 47.18±67.29 min in group 3. Conclusion: Intraoperative digoxin can independently decrease the incidence of AF after CABG surgery in patients with high risk factors for AF.
- انتشار مقاله: 04-03-1394
- نویسندگان: M.H. Nemati,M. Eskandari
- مشاهده