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| 1 | Numerical Investigation of Penetration in Ceramic/Aluminum Targets Using Smoothed Particle Hydrodynamics Method and Presenting a Modified Analytical Model显示文摘Radius of ceramic cone can largely contribute into final solution of analytic models of penetration into ceramic/metal targets.In the present research,a modified model based on radius of ceramic cone was presented for ceramic/aluminum targets.In order to investigate and evaluate accuracy of the presented analytic model,obtained results were compared against the results of the Florence’s analytic model and also against numerical modeling results.The phenomenon of impact onto ceramic/aluminum composites were modeled using smoothed particle hydrodynamics(SPH)implemented utilizing ABAQUS Software.Results indicated that,with increasing initial velocity and ceramic thickness and decreasing support layer thickness,the radius of ceramic cone decreases;this ends up increasing residual velocity of the projectile and penetration time and extending the area across which the pressure is distributed.These findings indicate enhanced levels of target energy absorption and the required energy for bending and tensioning the target.As such,it can be observed that,at the same thickness and areal density,the ceramic target has its efficiency enhanced with increasing ceramic thickness and decreasing the support layer thickness.Finally,the results revealed that the associated data with SPH confirm the modified analytic model at higher accuracy than the Florence’s analytic model. | Ehsan Hedayati Mohammad Vahedi | 2017 | Computer Modeling in Engineering & Sciences2017，，3： | 8 |
| 2 | Low-cost sensorless control of four-switch,brushless DC motor drive with direct back-EMF detection显示文摘We propose a position sensorless control scheme for a four-switch,three-phase brushless DC motor drive,based on the zero crossing point detection of phase back-EMF voltages using newly defined error functions(EFs). The commutation in-stants are 30° after detected zero crossing points of the EFs. Developed EFs have greater magnitude rather than phase or line voltages so that the sensorless control can work at a lower speed range. Moreover,EFs have smooth transitions around zero voltage level that reduces the commutation errors. EFs are derived from the filtered terminal voltages vao and vbo of two low-pass filters,which are used to eliminate high frequency noises for calculation of the average terminal voltages. The feasibility of the proposed sensorless control is demonstrated by simulation and experimental results. | Abolfazl HALVAEI NIASAR Abolfazl VAHEDI Hassan MOGHBELLI | 2009 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2009，10，2： | 4 |
| 3 | Emergency medicine as a growing career in Iran: an Internet-based survey显示文摘BACKGROUND: In Iran, few studies have evaluated emergency medicine as a career option. In the present study, we aimed to find out how Iranian emergency-medicine specialists view their specialty as a career.METHODS: Following a qualitative study, a Likert-scale questionnaire was developed. Iranian emergency physician specialists who had at least two years' job experience were contacted via email. A uniform link to a Web-based survey and a cover letter that explained the survey were sent to the recipients. We used the Kruskal-Wallis test and post hoc analysis to determine the differences between demographic subgroups.RESULTS: A total of 109 eligible responses were received, a response rate of 72.63%. Of the responders, 57.8% were 30–40 years of age, 86.2% were male, 86.2% were single, 84.4% were faculty members and 90.8% had fewer than 10 years' job experience. The main problems occurring during the career of Iranian emergency physicians were: insuffi cient income, inadequate recognition of the specialty by the community, inadequate union support, insecurity in the emergency wards, overcrowding, job stresses and night shifts. Despite insufficiency of income, Iranian emergency physicians(EPs) did not care about the financial benefits of patient care. Academic activity had positive effects on the perspectives of Iranian emergency physicians regarding their careers.CONCLUSION: Iranian emergency physicians and leaders in emergency medicine should struggle to improve the present situation, aiming at an ideal state. | Shcrvin Farahmand Ehsan Karimialavijeh Hojjat Sheikh Mottahar Vahedi Amirhossein Jahanshir | 2016 | World Journal of Emergency Medicine2016，7，3： | 4 |
| 4 | A Randomized,Double Blinded,Placebo-Controlled Clinical Trial of Silymarin in Ulcerative Colitis显示文摘Objective:To evaluate the clinical efficacy of silymarin in ulcerative colitis(UC) patients.Methods:A randomized double blinded placebo-controlled clinical trial was conducted in 80 UC patients whose disease had been documented and were in remission state between September 2009 and October 2010.Patients were assigned to silymarin group(42 cases) and placebo group(38 cases) using a random number table.Either silymarin(140 mg) or placebo(lactose mono-hydrate,corn starch magnesium stearate) tablets were given once daily for 6 months along with their standard therapy.The efficacies were assessed by disease activity index(DAI),frequency difference of the disease flare-up,and paraclinical data.Results:Ten patients(4 in the silymarin group due to nausea and 6 in the placebo group due to disease flare-up and abdominal pain)discontinued the study.An improvement in hemoglobin level(11.811.6 g/dL vs.13.4 ±1.2 g/dL,P<0.05)and erythrocyte sedimentation rate(23.7±11.5 mm/h vs.10.8±3.2 mm/h,P<0.05) was observed in the silymarin group but not in the placebo group.DAI significantly decreased in the silymarin group and reached from 11.3 ±3.5 to 10.7 ±2.8(P<0.05).Thirty-five out of 38 patients in the silymarin group were in complete remission with no flare-up after 6 months as compared to 21 out of 32 patients in the placebo group(P=0.5000).Conclusion:Silymarin as a natural supplement may be used in UC patients to maintain remission. | Mansoor Rastegarpanah Reza Malekzadeh Homayoun Vahedi Maryam Mohammadi Elham Elahi Meghedi Chaharmahali Tahereh Safarnavadeh Mohammad Abdollahi | 2015 | Chinese Journal of Integrative Medicine2015，21，12： | 2 |
| 5 | Diagnostic Value of Endoscopic Capsule in Patients with Obscure Digestive Bleeding: Blinded Comparison with Video Push-Enteroscopy显示文摘 | J.-C. Saurin M. Delvaux J.-L. Gaudin I. Fassler J. Villarejo K. Vahedi A. Bitoun J.-M. Canard J. Souquet T. Ponchon C. Florent G. Gay | 2003 | Endoscopy2003，，07： | 2 |
| 6 | Diagnostic Value of Endoscopic Capsule in Patients with Obscure Digestive Bleeding: Blinded Comparison with Video Push-Enteroscopy显示文摘 | J.-C. Saurin M. Delvaux J.-L. Gaudin I. Fassler J. Villarejo K. Vahedi A. Bitoun J.-M. Canard J. Souquet T. Ponchon C. Florent G. Gay | 2003 | Endoscopy2003，，07： | 2 |
| 7 | 后续焊缝热处理对气体保护钨极电弧焊AA6061-T6合金显微组织和力学性能的影响(英文)显示文摘采用ER5356焊料对AA6061-T6合金板材进行双V坡口气体保护钨极焊接。采用XRD、FESEM、EBSD、纳米压痕和拉伸测试研究焊接后及后续焊缝热处理后焊接接头的显微组织、力学性能和纳米力学性能。结果表明,后续焊缝热处理可使热影响区的显微组织恢复,并在焊缝区的晶界上形成β相(Al_3Mg_2)。经后续焊缝热处理后,所有区域的硬度均增加,而焊缝区的弹性模量从69.93 GPa增加至81 GPa。经后续焊缝热处理后,焊接区的显微组织均匀,与基体合金相比,力学性能得到提高。 | Firouz FADAEIFARD Khamirul Amin MATORI Farhad GARAVI Muath Al-FALAHI Gholamreza Vahedi SARRIGANI | 2016 | Transactions of Nonferrous Metals Society of China2016，26，12： | 2 |
| 8 | Sequential-design,multicenter,randomized,controlled trial of early decompressive craniectomy in malignant middle cerebral artery infarction(DECIMAL Trial)显示文摘 | Vahedi K Vicaut E Mateo J | 2007 | Stroke2007，38，9： | 1 |
| 9 | A Monte Carlo collision model for the particle-in-cell method: applications to argon and oxygen discharges显示文摘 | V. Vahedi M. Surendra | 1995 | Computer Physics Communications1995，，： | 1 |
| 10 | Furazolidone versus metronidazole in quadruple therapy for eradication of Helicobacter pylori in duodenal ulcer disease显示文摘 | Malekzadeh R Ansari R Vahedi H | 2000 | Aliment Pharmacol Ther2000，14，： | 1 |
| 11 | Study the influence of geometric parameterson the torque of electrostatic micromotors 显示文摘 | Behjat V Vahedi A | 2006 | Electrical Engineer-ing2006，89，： | 1 |
| 12 | Sequential-design, multicenter, randomized, controlled trial of early decompressive craniectomy in malignant middle cerebral artery infarction (decimal trial)显示文摘 | Vahedi K Vicaut E Mateo J | 2007 | Stroke2007，38，9： | 1 |
| 13 | Short chain fructo-oligosaccharides administration dose-dependantly increases fecal bifidobacteria in healthy humans 显示文摘 | Bouhnik Y Vahedi K Achour L | 1999 | J Nutr1999，129，： | 1 |
| 14 | Early decompressive surgery inmalignant infarction of the middle cerebral artery:a pooled analysis of three randomised controlled trials 显示文摘 | Vahedi K Hofmeijer J Juettler E | 2007 | Lancet Neurol2007，6，： | 1 |
| 15 | Improved switc- hing table for direct power control of three-phase PWM rectifier 显示文摘 | BAKTASH A VAHEDI A MASOUM M A S | 2008 | IEEE Transactions on Industry Electronics2008，78，1： | 1 |
| 16 | Saliva secretion and efficacy of helicobacter pylori eradication in peptic ulcer patients 显示文摘 | Vahedi M Khalilian A Abdollahzadeh SH | 2011 | J Dent (Tehran)2011，8，4： | 1 |
| 17 | Monte Carlo collision model for the particle-in-cell method:Applications to argon and oxygen discharges显示文摘 | Vahedi V Surendra M | 1995 | Computer Physics Communications1995，87，： | 1 |
| 18 | On the pressure drop prediction of filter media composed of fibers with bimodal diameter distributions显示文摘 | JAGANATHAN S VAHEDI T H | 2008 | Power Technology2008，181，： | 1 |
| 19 | Octreotide for recurrent intestinal variceal bleeding in patients without portal hypertension显示文摘 | Dray X Vahedi K Odinot JM | 2009 | Eur J Gastroenterol Hepatol2009，21，7： | 1 |
| 20 | CACNAIA gene de novo mutation causing hemiplegic migraine, coma, and cerebellar atrophy显示文摘 | Vahedi K Denier C Ducros A | 2000 | Neurology2000，55，7： | 1 |
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