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Search Results: 1 - 10 of 149820 matches for " Eskandari H "
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Intramedullary spinal melanocytoma
Ramin Eskandari,Meic H. Schmidt
Rare Tumors , 2010, DOI: 10.4081/rt.2010.e26
Abstract: Meningeal melanocytoma is a benign lesion arising from leptomeningeal melanocytes that at times can mimic its malignant counterpart, melanoma. Lesions of the spine usually occur in extramedullary locations and present with spinal cord compression symptoms. Because most reported spinal cases occur in the thoracic region, these symptoms usually include lower extremity weakness or numbness. The authors present a case of primary intramedullary spinal meningeal melanocytoma presenting with bilateral lower extremity symptoms in which the patient had no known supratentorial primary lesions. Gross total surgical resection allowed for full recovery, but early recurrence of tumor was detected on close follow-up monitoring, allowing for elective local radiation without loss of neurological function. Case reports of such tumors discuss different treatment strategies, but just as important is the close follow-up monitoring in these patients even after gross total surgical resection, since these tumors can recur.
Simpson’s Method for Solution of Nonlinear Equation  [PDF]
Hamideh Eskandari
Applied Mathematics (AM) , 2017, DOI: 10.4236/am.2017.87073
Abstract: The programs offered for solving nonlinear equations, usually the old method, such as alpha, chordal movement, Newton, etc. have been used. Among these methods may Newton’s method of them all be better and higher integration. In this paper, we propose the integration method for finding the roots of nonlinear equation we use. In this way, Newton’s method uses integration methods to obtain. In previous work, [1] and [2] presented numerical integration methods such as integration, trapezoidal and rectangular integration method that are used. The new method proposed here, uses Simpson’s integration. With this method, the approximation error is reduced. The calculated results show that this hypothesis is confirmed.
The Comparison between Present with Desired Organizational Culture in Tehran University of Medical Sciences’ Hospitals
H Dargahi,M Eskandari,G Shaham
Payavard Salamat , 2010,
Abstract: Background and Aim: The study of organizational culture as a managerial tools, is necessary in health care organizations. Hospital administrators should compare present with desired hospitals' organizational culture continuously. This research is aimed to compare the present with desired organizational culture as administrators' view in Tehran University of Medical Sciences' Hospitals.Materials and Methods: A Cross - Sectional' descriptive and analytical study was conducted among 15 Tehran University of Medical Sciences' Hospitals administrators by a questionnaire including demographic information and 30 questions which determined the approach of TUMS hospitals administrators about current and appropriate organizational culture components. Before the main study, validity and reliability of the questionnaire was performed. The data was collected by SPSS version 15 software and analyzed by Chi-square, Pearson and T tests.Results: The result of this study showed that leadership was the most and control was the least organizational culture components which observed in present condition.Discussion and Conclussion: As TUMS hospital administrators' view, all of the hospitals organizational culture components, exception control and communication patterns, are not observed in current status.There is a significant difference between current and appropriate hospital organizational culture components as the administrator's view which impressed on the hospital management system. Therefore, the hospitals administrators are required to do strategic planning to optimize the hospitals organizational cultures.
Comparison of Different Animal Models in Estimation of Variance Components and Genetic Parameters of Body Weight of Mehraban Sheep
F GHafori,M Eskandari,H Mohamadi
Journal of Science and Technology of Agriculture and Natural Resources , 2009,
Abstract: Variance components and genetic parameters of body weight of Mehraban sheep were estimated by univariate and random regression models. This was done by using body weight records of 2746 Mehraban lambs related to flocks under supervision of the Agriculture Organization of the Hamadan province, collected between 1990 and 2005. In both methods, variance components estimates were obtained by restricted maximum likelihood (REML) using DFUNI and DXMRR programs, respectively, via DFREML 3.1 software package. Results showed that variance components obtained from RR models (except for residual variance) in some ages were higher than those obtained from univariate models. Direct heritability (h2) estimates from univariate and RR models were approximately equal to weaning age; but, overall, RR estimates were higher than those obtained from univariate analyses. Maternal heritability estimates (m2) from RR models were higher than univariate models’ estimates, and showed a different pattern of variation with age. Correlations between predicted breeding values from univariate and RR models for birth weight and weaning weight were 0.72 and 0.70, respectively. Results showed that estimates of variance components and genetic parameters by RR models were affected by data structure; and in case of the need for genetic parameters, especially those related to body weight late in lambs’ life, estimates of univariate analyses should be preferred.
Detection of Morphometric Differentiation of Liza aurata (Pisces: Mugilidae) in Southeastern of the Caspian Sea, Iran
S. Kohestan-Eskandari,H. AnvariFar,H. Mousavi-Sabet
Our Nature , 2013, DOI: 10.3126/on.v11i2.9595
Abstract: A 13-landmark morphometric truss network system was used for 135 specimens to investigate the hypothesis differentiation of golden grey mullet along the southeastern Caspian Sea. Univariate analysis of variance showed significant differences among the means of the three groups for 35 standardized morphometric measurements out of 78 characters studied. In linear discriminant function analysis (DFA), the overall assignment of individuals into their original groups was 66.7%. The proportions of individuals correctly classified into their original groups were 62.5%, 59.1%, 76.5% in Neka, Behshahr and Galogah populations, respectively. The Principal Component Analysis (PCA) showed that the specimens grouped into 2 areas with high degree of overlap. Clustering analysis based on Euclidean square distances among the studied groups of centroids using an UPGMA resulted segregation of the three populations into two distinct clusters. These results could be of interest for management and conservation programs of this species in the Caspian Sea. DOI: http://dx.doi.org/10.3126/on.v11i2.9595 Our Nature 2013, 11(2): 126-157
Intestinal Parasitic Infections in Renal Transplant Recipients
M Nateghi Rostami,H Keshavarz,E Eskandari,EB Kia
Iranian Journal of Parasitology , 2007,
Abstract: Background: Organ transplant recipients can experience serious diseases from infections due to emerging and reemerging parasitic infections. This study was carried out to evaluate the prevalence of intestinal parasites among renal transplant re-cipients of Iran. "nMethods: This cross-sectional study was conducted from June 2003 to August 2004 on renal transplant recipients in Iran. A total of 706 fecal samples obtained from randomly selected population originated from all over Iran. Patient's information was recorded in a questionnaire before sampling. A sample of stool was taken from each person. Direct wet smear exami-nation, formalin-ether concentration, Ziehl-neelsen staining, and agar plate culture were done for each sample. "nResults: Totally 32 patients (4.5%) were positive for parasitic infections. In searching for emerging parasitic infections, the most prevalent parasites were found to be Blastocystis hominis, Giardia lamblia and Entamoeba coli, respectively. The merely ova which were seen were related to Hymenolepis nana. With investigation of healthy control, no significant differ-ence was found between transplanted and normal population. "nConclusion: The population showed controlled rate of intestinal infections probably due to regular awareness concerning risks of opportunistic infections; albeit regular surveillance through routine examination of stool samples for parasites seems considerably advantages the transplant recipient patients.
Correlation of the intraocular pressure with increased intracranial pressure in rabbits
Eskandari H,Hamzeimoghadam A,Fatolahpour E,Sheibani E
Acta Medica Iranica , 2000,
Abstract: Although measurement of intracranial pressure by noninvasive methods has been suggested, but mainly invasive methods are used for this purpose-Increase in episcleral venous pressure can be expected to result in a linear increase in intraocular pressure. Congested oculat veins with capillary leakage and hemorrhage are seen when the ICP is increased, thus theoretically measurement of intraocular pressure can be a procedure for estimation of the ICP. This study was performed to find whether there is andy relationship between intraocular pressure and ICP, so we used 12 albino rabbits in two divided groups. Our study was not designed to elucidate the mechanism of change but merely to record any changes observed. All measures except an increase in ICP were applied on the test group as well as on the control group. After general anesthesia with the combination of ketamin, rampune, and pentobarbital a burr hole was made in the lambda region of the skull and a cannula was placed in the subdural space. The ICP in the test group increased up to 15 mmHg and was constant throughout the experiment. Intraocular pressure was measured by Schiotz tonometers afte general anesthesia, after cannulation of the skull, and immediately after increasing the ICP which was repated in 15 minutes interval for 4 hours. There was no statistical difference between the two groups (P:0.997) . results show that neither cannulation nor general anesthesia for 4 hours produce alteration in IOP in the control group nor increasing of the ICP to level of 15 mmHg produces any alteration in IOP on the test group.
Steckbrief seltener Krankheitsbilder: Spinale arterioven se Malfomationen: Seltene Ursachen einer Subarachnoidalblutung
Alimohammadi A,Eskandari H,Sherif C,Karaic R
Journal für Neurologie, Neurochirurgie und Psychiatrie , 2011,
Abstract:
Real-time measurement of laser induced photoconductivity in sol-gel derived Al doped ZnO thin films
F. Eskandari,M. Ranjbar,P. Kameli,H. Salamati
Physics , 2014,
Abstract: In this paper Al doped ZnO (AZO) thin films with 0, 3, 6 and 12 at. % Al concentration were prepared by sol-gel method on glass substrates. The deposited films were annealed at different temperatures of 300, 350, 400, 450 and 500 {\deg}C for 1 h in air. X-ray diffraction (XRD) showed wurtzite crystalline structure for the films annealed above 400 {\deg}C. The films were subsequently irradiated by beams of excimer (KrF, {\lambda}=248 nm) laser. The evolution of crystal structure, surface morphology and optical properties were studied using XRD, filed emission scanning electron microscope (FE-SEM) and UV-Vis spectrophotometer, respectively. Real-time measurement of electrical conductivity during laser irradiation showed a transient or persistent photoconductivity effect. The effect of laser energy on this photoconductivity was also investigated. Based on the observed photoluminescence (PL) and X-ray photoelectron spectroscopy (XPS), the observed photoconductivity effect was described.
AEESPAN: Automata Based Energy Efficient Spanning Tree for Data Aggregation in Wireless Sensor Networks  [PDF]
Zahra ESKANDARI, Mohammad Hossien YAGHMAEE
Wireless Sensor Network (WSN) , 2009, DOI: 10.4236/wsn.2009.14039
Abstract: In Wireless Sensor Networks (WSNs), sensor nodes are developed densely. They have limit processing ca-pability and low power resources. Thus, energy is one of most important constraints in these networks. In some applications of sensor networks, sensor nodes sense data from the environment periodically and trans-mit these data to sink node. In order to decrease energy consumption and so, increase network’s lifetime, volume of transmitted data should be decreased. A solution, which is suggested, is aggregation. In aggrega-tion mechanisms, the nodes aggregate received data and send aggregated result instead of raw data to sink, so, the volume of the transmitted data is decreased. Aggregation algorithms should construct aggregation tree and transmit data to sink based on this tree. In this paper, we propose an automaton based algorithm to con-struct aggregation tree by using energy and distance parameters. Automaton is a decision-making machine that is able-to-learn. Since network’s topology is dynamic, algorithm should construct aggregation tree peri-odically. In order to aware nodes of topology and so, select optimal path, routing packets must be flooded in entire network that led to high energy consumption. By using automaton machine which is in interaction with environment, we solve this problem based on automat learning. By using this strategy, aggregation tree is reconstructed locally, that result in decreasing energy consumption. Simulation results show that the pro-posed algorithm has better performance in terms of energy efficiency which increase the network lifetime and support better coverage.
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