OALib Journal期刊

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匹配条件: “A Akbarzadeh Baghban” ,找到相关结果约460118条。
Diagnostic Values of Laser Fluorescence Device with Other Techniques in Occlusal Caries Detection
M. Biria,M. Moshfeghi,A. Akbarzadeh Baghban,A. Chehresaz
Journal of Dentistry of Tehran University of Medical Sciences , 2009,
Abstract: Objective: The aim of the present study was to compare the performance of laser fluorescence (LF) method with other conventional diagnostic techniques in detection of smallocclusal caries in permanent teeth.Materials and Methods: Prior to this in vitro diagnostic study, a pilot study assessed intra-examiner reliability and reproducibility. The occlusal surfaces of 90 extracted human premolars were examined with four diagnostic methods: probing, visual inspection, bitewing(BW) radiographs, and LF. The teeth were then sectioned for the purpose of histological examination. The data were analyzed using SPSS 15 software, and sensitivity,specificity and other diagnostic criteria of the techniques were calculated.Results: The intra-examiner reproducibility for probing and also radiographic techniques was 100%. The corresponded figure for LF (88%) was more than visual inspection (82%).The highest level of validity of the examiner turned out to be in probing technique(76.9%). Sensitivity of visual inspection, probing, and LF methods was 54.5% and that of BW radiography was 27.5%. Specificity and efficiency of LF method were 84.8% and 81.1%, respectively. Probing and visual inspection showed the highest specificity (97.5% and 94.9, respectively) and efficiency (92.2% and 90%, respectively) among the methods.Conclusion: Specificity and efficiency of LF method were lower compared to those of other methods. Among all the investigated methods, the most efficient methods in the diagnosis of small occlusal caries in permanent teeth were probing and visual inspection,respectively.
The Effects of Temperature and Birth Weight on the Transition Rate of Hypothermia in Hospitalized Neonates Using Markov Models
A Akbarzadeh Baghban,S Jambarsang,H Pezeshk,F Nayeri
Tehran University Medical Journal , 2012,
Abstract: Background: Hypothermia is an important determinant of survival in newborns, especially among low-birth-weight ones. Prolonged hypothermia leads to edema, generalized hemorrhage, jaundice and ultimately death. This study was undertaken to examine the factors affecting transition from hypothermic state in neonates.Methods: The study consisted of 439 neonates hospitalized in NICU of Valiasr in Tehran, Iran in 2005. The neonates' rectal temperature was measured immediately after birth and every 30 minutes afterwards, until neonates passed hypothermia stages. In order to estimate the rate of transition from neonatal hypothermic state, we used multi-state Markov models with two covariates, birth weight and environmental temperature. We also used R package to fit the model.Results: Estimated transition rates from severe hypothermia and mild hypothermia were 0.1192 and 0.0549 per minute, respectively. Weight had a significant effect on transition from hypothermia to normal condition (95% CI: 0.1364-0.4165, P<0.001). Environmental temperature significantly affected the transition from hypothermia to normal stage (95% CI: 0.0439-0.4963, P<0.001).Conclusion: The results of this study showed that neonates with normal weight and neonates in an environmental temperature greater than 28 °C had a higher transition rate from hypothermia stages. Since birth weight at the time of delivery is not under the control of medical staff, keeping the environmental temperature in an optimum level could help neonates to pass through the hypothermia stages faster.
Evaluation of Solid Waste Management in the Chemistry Laboratories of Tehran Universities
M Ghani,F Golbabaie,A.R Akbarzadeh Baghban,H Aslani
Iranian Journal of Health and Environment , 2011,
Abstract: Background and Objectives: Particular importance of hazardous wastes is due to having characteristics such as toxicity, flammability, corrosively and reactivity. Some of the chemical wastes due to having hazardous materials must be collected and managed in a proper manner, since they are potentially harmful to the environment. Owing to the fact that educational centers have important roles in developing countries, so the main objective of the present study was to investigate, hazardous waste management in chemistry laboratories of Ministry of Science universities, in Tehran, Iran.Materials and Methods: Study area of this research includes all chemistry laboratories in Tehran universities which were covered by Ministry of Science. To obtain the number of samples, based on Scientific Principles and identification formula, 64 samples were calculated. In addition, sampling was done by Stratified sampling. Validated checklists were used for data gathering. Data analysis were done by Descriptive statistics (mean, frequency and etc.) and inferential statistics (kruskal- wallis test).Results: results obtained in this study indicate that Sharif University by obtaining the mean score of 60.5 and Tehran University by obtaining the mean score of 4.5-6 are placed in best and worst rank, respectively. Beheshty, Alzahra and Tarbiat Moallem univesities by acquiring the mean score of 20-28.5 have a same position in ranking table. Conclusion: Results show that most of the studied laboratories do not have any collection program and only 26.5 percent of them have acceptable programs.The separation and storing program observed in about 12.5 percent . Hazardous wastes management in chemistry laboratory of Tehran Universities was not in good status. And from the standpoint of management, only 12.5 percent of studied cases are in good status, while 75 percent was in undesirable status.
Challenges of Change Management: A Qualitative Study on Managers' Experiences in Nursing and Midwifery Schools
Alice Khachian,Houman Manoochehri,Mehrnoosh Pazargadie,Alireza Akbarzadeh Baghban
Hayat Journal of Faculty of Nursing & Midwifery , 2012,
Abstract: Background & Aim: The objective of this study was to investigate perspectives of managers regarding change management in nursing and midwifery schools. Methods & Materials: In this qualitative study, we used a descriptive exploratory approach with triangulation. We used snow ball sampling to recruit faculty members of nursing and midwifery schools in Tehran. The participants were included in the study if they had at least 1-year experience as a faculty member. Data were gathered using semi-structured interviews in which a guide and field notes were used. Data were saturated after observing repetition of the codes. Latent content analysis was used for data analysis. The trustworthiness was achieved using a prolonged field experience, member check, peer check and sharing the content with two qualitative research experts. Results: Ten participants (seven females and three males) aged 38-54 were interviewed. Three participants were employed in highly recognized management levels. Immediately after interviews, conceptual codes were extracted. Suggested themes were classified as concentration in management, managers' characteristics, and attitude toward change. Conclusion: Accordingly, the concept of change management was postulated as the purpose of this study. Furthermore, its influencing factors were identified. The results of this study can be used by faculties of the nursing and midwifery schools to use them according to their organizational culture.
Comparison between the Precision of Measurements in Two Types of the Micropipettes according to CLSI EP5 and ISO 8655
Hamid Alavi Majd,Jamal Hoseini,Hossein Tamaddon,Alireza Akbarzadeh Baghban
Koomesh , 2009,
Abstract: Background: In the diagnosis medical labs, it is very important to evaluate the precision ofmicropipettes in transferring small amounts of liquids. The medical tests will not result accurately, ifthe liquid volume doesn’t transfer exactly by micropipettes. Thus the doctor faces sort of problems inthe disease diagnosis and its control. In the standard CLSI EP5, there is a method to specify and assessthe precision of micropipettes, by using CV (coefficients of variation). Also there are other methods toestimate and test the mention CV theory, in the formal statistic texts which could be used to assess themicropipettes precision. It is the main goal of this research to study the precision of lab micropipetteswhich are shown by A and B and compared by reference standard value from ISO 8655.Material and Methods: In this research we evaluate the precision of the lab micropipettes. Twobrands A and B are assigned to measure the distilled water mass by using the accurate scale which isaccurate up to 10-6 to measure 50 gram weight. The experimental environment is a metrology labwhich is confirmed by Iran Standard and Industrial Researches. A unique technician sampled in thebeginning of the work time and after 2 hours repeated the sampling. Totally, each micropipette is usedto measure 40 times with 10 times repeat for single measurement in 28 work days. It is used commonstatistical methods to estimate and test the coefficients of variation theory.Results: Point estimation of CV for micropipettes A and B were 0.50% and 0.64% respectively.Also the 95% confidence upper bounds for these two micropipettes by using likelihood ratio methodwere 0.53% and 0.64% respectively. The micropipette A confirmed the ISO 8655, but the micropipetteB did not. Measurement error in micropipette B was 30% less than micropipette A in average.Conclusion: By using the approach of CLS EP5 and confidence interval for CV, precision of twomicropipettes were compared. Only one of them confirmed the ISO 8655, but the other one was failed .
The Effect of Diabetes on Induced Pain of Formalin and Baclofen Analgesia in Rats
Elaheh Nooshinfar,Mohsen Hamidpoor,Ali Reza Akbarzadeh Baghban;,Vahid Mansoori
Journal of Paramedical Sciences , 2010,
Abstract: One of the side effects of dibetecs epidemics today in the world is painfulneuropathy, the reasons and treatments of which are unknown. Duo to the importance of problem of pain treatment as on of the harmful phenomena in life, this research studies the effect of continued diabetes on the formalin induced pain and baclofen analgesia in rats. Moreover the effect of baclofen as a non-opiate, analgesic drug on the increased pains in the quiescent phase as the model of diabetic pain is investigated. The method is experimental, evaluating the pain level through conducting the formalin test in 3 groups of rats. The first group was divided to control (injection normal salin) and diabetc (injection aloxan 100mg per kg) which were tested, after one to four weeks from the begining of diabetes, the second one was divided to a new control and diabetic group, and before performing formalin test, the baclofen(10mg per kg) was injected to them. And the third one was divided to two diabetics groups that received baclofen and normal salin and then the pain of the quiescent phase was compared in them. The results indicate that diabetes increases formalin induced pain and remained with continud diabetes. It also indicate that diabetes establishes increased pain in the quiscent phase , yet, it has had no influene on the baclofen analgesic effect on the first phase of formalin test but increased it on the second phase. Moreover baclofen can quiet the increased pain in quiscent phase very well. Duo to the results of this study it seems that diabetes, with changes in the centeral and peripheral pathways of the pain and also pain control, increases the pain. More studies are required to determining its mechanisms. These changes are accompanied with weakening the internal antipain systems such as Gaba ergic, which can be treated with baclofen . Diabetes has no intraction with the baclofen analgesics effect, so, baclofen may be recommended as an effective drug to comfort painful diabetic neurophathy.
Comparison of the Precision of Measurements in Three Types of Micropipettes according to NCCLS EP5-A2 and ISO 8655-6
Hamid Alavi Majd,Jamal Hoseini,Hossein Tamaddon,Alireza Akbarzadeh Baghban
Journal of Paramedical Sciences , 2010,
Abstract: Micropipettes or piston pipettes are used to make most volume measurements in fields such as health, chemistry, biology, pharmacy and genetics. Laboratories must ensure that results obtained using these instruments are reliable; therefore, it is necessary to calibrate micropipettes. Before the start of the calibration process, we must check the precision of measurements. The objective of this work is to compare several methods for calculating the precision of three kinds of micropipettes according to the reference value in ISO 8655-6. The medical tests will not have accurate results, if the volume of the liquid doesn’t transfer precisely by micropipettes. Thus, the physician might potentially face problems in the disease diagnosis and its control. In the NCCLS EP5-A2, there is a method to specify and assess the precision of micropipettes by using CV (Coefficient of Variation). Also there are other methods to estimate and test the CV theory, in the formal statistics texts which could be applied to assess the micropipettes precision. In this research we evaluate the precision of lab micropipettes. Three brands of micropipettes, A, B and C are assigned to measure the distilled water mass by using accurate scale which is accurate up to 10-6 to measure 50-gram weights. The experimental environment is a metrology lab which is approved by Iran Standard and Industrial Researches Organization. A technician sampled at the beginning of the experiment and then after 2 hours, the same technician repeated the sampling. Overall, each micropipette is used to measure 40 times with 10-repeat times for single measurement in 28 work days. Common statistical methods are used to estimate and test the CV. Point estimation of CV for micropipettes A, B and C were 0.50%, 0.64% and 1.56%, respectively. Furthermore, the upper limit of 95% confidence bounds for these three micropipettes using the exact method were 0.53%, 0.69% and 1.65%, respectively. Micropipette A met the ISO 8655-6 standard level, but micropipettes B and C did not. On average, measurement errors in micropipettes B and C were respectively 30% and 3.11 times more than micropipette A. By using the approach of CLS EP5-A2 and confidence interval for CV, precision of the three micropipettes were compared. Only one of them met the ISO 8655-6 standard level, but the others failed.
Harmonicity of unit vector fields with respect to a class of Riemannian metrics
A. Baghban,E. Abedi
Mathematics , 2014,
Abstract: The isotropic almost complex structures induce a Riemannian metric $g_{\delta,\sigma}$ on TM, which are the generalized type of Sasakian metric. In this paper, the Levi-Civita connection of $g_{\delta,\sigma}$ is calculated and the harmonicity of unit vector fields from $(M, g)$ to $(S(M), i*g_{\delta,0})$ is investigated, where $i*g_{\delta,0}$ is a particular type of induced metric $i*g_{\delta,\sigma}$. Finally, an important example is presented which satisfies in main theorem of the paper.
The Effects of Cupping Therapy on Skin’s Biomechanical Properties in Wistar Rats  [PDF]
Mohammad Mohsen Roostayi, Taraneh Norouzali, Farideh Dehghan Manshadi, Mehdi Abbasi, Alireza Akbarzadeh Baghban
Chinese Medicine (CM) , 2016, DOI: 10.4236/cm.2016.71004
Abstract: Cupping therapy has been widely used for clinical treatment of soft tissue lesions. The current study investigated the effects of cupping therapy on biomechanical properties of the skin in Wistar rats. 20 rats were divided into two groups: 10 in experimental and 10 in control group. Either the right or the left lower quadrants of the lumbar regions in the experimental group underwent 10 minutes daily cupping therapy for 12 days. The skin stiffness and ultimate tensile strength of all the rats were measured using tensiometer. The skin stiffness and ultimate tensile strength were decreased significantly in cupping side of the experimental group as compared with the non-cupping side and the control group. There were no significant differences between the non-cupping side of the experimental group and the control group. In conclusion, cupping therapy can be useful as a treatment method to reduce the skin stiffness and ultimate tensile strength.
Optimized peseudopotential and methods of its generation
H. Akbarzadeh,A. Roudgar
Iranian Journal of Physics Research , 1999,

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