در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Optoelectronical Nanostructures
- نوع مقاله: Journal Article
- کلمات کلیدی: Output power,threshold current,Quantum well,Vertical Cavity Surface Emitting Laser (VCSEL),Contact Length
- چکیده:
- چکیده انگلیسی: Abstract: In this study, the effects of variation of thickness and the number of quantum
wells as well as the contact length were investigated. In this paper, a vertical cavity surface
emitting laser was simulated using of software based on finite element method. The
number of quantum wells was changed from 3 to 9 and the results which are related to
output power, resonance wavelength and threshold current were extracted. Output
specifications in terms of quantum wells thicknesses of 3.5nm to 9.5nm were evaluated.
Contact thickness is also changed from 0.5μm to 3μm. Results showed that as the number
of quantum wells increased, the resonance wavelength also increased and photon energy
decreased. By reducing the thickness of the quantum well, the threshold current and
radiation wavelength were also decreased. By increasing the contact length, threshold
current and output power increased. Temperature inside the network and density of
photon were increased as the contact length increased- انتشار مقاله: 11-08-1398
- نویسندگان: Abbas Ghadimi,Mohamad Ahmadzadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Rehabilitation Sciences and Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Muscle strength,neurofeedback,Postural Balance,Proprioception,Patellofemoral Pain Syndrome
- چکیده:
- چکیده انگلیسی: Background: Patellofemoral pain syndrome (PFPS) has been reported as one of the most common reasons for knee pain which accounts for about 25 % to 40% of all knee injuries. These group of patients have Postural Balance disorder that can cause pain, dysfunction in proprioception and decreased muscle strength. We aimed to study a twelve-week neurofeedback training (NFT) on pain, proprioception, strength and Postural Balance in PFPS patients.
Methods: This randomized controlled trial included 32 patients with PFPS who were randomly allocated into experimental (n = 16) and control (n = 16) groups. The variables measured included pain, knee proprioception 20 and 60 degrees, muscular strength quadriceps and hip abductors and Postural Balance that were evaluated before and after intervention. The experimental group performed NFT during twelve weeks, three times per week and 30 min per session, while the control group did not receive any treatment during this time. Covariance statistical method was used for data analysis.
Results: The results of data analysis showed that the experimental group had significant improvement in postural balance index anterior-posterior (p<0.004), overall stability (p<0.003), knee proprioception 20 degrees (p<0.004), knee proprioception 60 degrees (p<0.004), quadriceps muscle strength (p<0.007) and pain reduction (p<0.001). However, postural balance index medial-lateral (p>0.140) and hip abductor muscle strength (p>0.164) had no improvement after twelve weeks of NFT.
Conclusions: The NFT through thalamus inhibition led to reduced pain and improved sensory pathways, sensory integrity, increased attention and cognition. They also led to improved proprioception, Postural Balance, overall stability and quadriceps muscle strength. It is suggested that future studies examine the impact of long-term and short-term NFT on the variables of the present study.- انتشار مقاله: 18-10-1398
- نویسندگان: Mohamadreza Ahmadi,Ali Yalfani,Farzaneh Gandomi,Khosro Rashid
- مشاهده
- جایگاه : پژوهشی
- مجله: Current Medical Mycology
- نوع مقاله: Journal Article
- کلمات کلیدی: diabetes,HbA1c,Candida,Urinary tract infections
- چکیده:
- چکیده انگلیسی: Background and Purpose: The presence of Candida yeasts in urine, known as candiduria, is an indicator of infection or colonization of the urinary tract by Candida species. This condition in diabetic patients can be hazardous due to diminished immune system response. The objective of this study was to investigate the incidence of candiduria in diabetic patients and to identify its causative agents. Furthermore, the demographic and laboratory (HbA1c, urine glucose and pH, urine culture colony count, and fasting blood sugar) data and their possible associations with candiduria were investigated.
Materials and Methods: This cross-sectional, descriptive study was performed on 305 diabetic patients referred to
the diabetes research center, Hamedan, Iran, during April 2015 to September 2015. Urine and blood specimens were
collected and urine analysis, urine culture, FBS, and HbA1c tests were performed. Positive cases were subjected to
colony count and the causative agents were subsequently identified through the routine identification tests, as well as
colony color in CHROMagar Candida medium, and the assimilation patterns in API 20 C auxanographic method.
Results: Among the 305 cases, 38 (%12.5) were positive for candiduria. Causative agents were identified as
Candida glabrata (n=19, 50%), C. albicans (n=12, 31.6%), C. krusei (n=4, 10.5%), C. tropicalis (n=2, 5.3%), and
C. kefyr (n=1, 2.6%). According to the results of the statistical analyses, there were significant association between
candiduria and female gender, high FBS and urine glucose, uncontrolled diabetes (HbA1c ≥8), and acidic urine pH (P < /em><0.05).
Conclusion: Considering the high incidence rate of candiduria in diabetic patients, control of diabetes, predisposing factors, and causal relationships between diabetes and candiduria should be highlighted.- انتشار مقاله: 18-04-1398
- نویسندگان: Mehraban Falahati,Shirin Farahyar,Lame Akhlaghi,Kamran Sabzian,Mohamad Yarahmadi,Reza Aslani
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Pacific Journal of Cancer Prevention
- نوع مقاله: Journal Article
- کلمات کلیدی: peri-operative liver function,hepatectomy,Syria
- چکیده:
- چکیده انگلیسی:
Background: Liver resection is the only viable therapeutic treatment option for several neoplastic entities of the liver. Although, the number of resectable patients is increasing in Syria, liver failure is still a major complication affecting mortality and morbidity rates. Methods: Between 2009 and 2016, 104 patients undergoing liver resection in Damascus University Faculty of Medicine were retrospectively analyzed. Liver function tests were conducted before surgery (ps) and in the perioperative period (po) and comparisons were performed with division into anatomic VS non-anatomic or malignant VS non-malignant groups. Results: Liver synthetic, excretory and detoxifying functions deteriorated after liver resection (INR ps ‘presurgery’=1.129 po ‘perioperative’=1.426 P<0.001, TP ps=7.426 po=5.581 P<0.001, ALB ps=4.204 po=3.242 P<0.001, T-Bill ps=0.061 po=0.136 P<0.001) and liver cell necrosis increased after resection (ALT ps=27.597 po=200.221 P<0.001, AST ps=33.395 po=190.553 P<0.001). There was no significant difference in liver functions when we compared anatomic VS non-anatomic groups or malignant VS non-malignant groups, but liver cell necrosis was higher with malignancies (ALT malignant group=236.475 non-malignant group=89.5 P=0.002, AST malignant group=222.644 non-malignant group=101.125 P=0.001). Conclusion: Although liver resection affects liver function significantly, no differences in outcomes were found between anatomic VS non anatomic or malignant VS non-malignant groups.- انتشار مقاله: 11-12-1395
- نویسندگان: Basel Ahmad,Khaled Turkmani,Mohamad Essam Marwa,Tareq Ahmad,Ramez Baghdadi,Shaimaa Aboudamaah,Khetam Alkhatib,Mohamad Ahmad
- مشاهده