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Search Results: 1 - 10 of 144493 matches for " F. Gholipour "
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Relationship between Vessel Diameter and Time to Maturation of Arteriovenous Fistula for Hemodialysis Access
M. Khavanin Zadeh,F. Gholipour,Z. Naderpour,M. Porfakharan
International Journal of Nephrology , 2012, DOI: 10.1155/2012/942950
Abstract: Introduction. Native arteriovenous fistula (AVF) is the recommended vascular access for HD patients by the Dialysis Outcomes Quality Initiative (DOQI) guidelines. The aim of our study was to determine the correlation between diameter and maturation of vessels in radiocephalic AVF. Methods. A prospective cross-sectional study carried out during 2006-2007 on 96 hemodialysis patients from Hasheminejad Kidney Center with non probability selection, all of them with end to side native AVF. Results. In this population 62.5% had wrist (distal radial artery) AVF and 37.5% had antecubital (proximal radial artery) AVF. The mean diameter of artery was 2.57?mm (SD = 1.09) and the mean diameter of vein was 2.40?mm (SD = 0.79). The mean of maturation period was 38.60 days (SD = 42.13). There were no relationship between duration of maturation period and diabetes mellitus, sex, age, diameter of vein and artery ( ). Period of maturation showed some correlation with the diameter of vein ( ) in patients with distal radiocephalic fistulae. Conclusions. The maturation of fistula shows correlation with vein diameter, but no correlation was seen with diameter of the arteries. There is much discrepancy between times to maturation in various reports. The average time for fistula maturation was 38/6 days in our study. 1. Introduction Surgery for hemodialysis (HD) access is the most commonly performed vascular surgical operation in the United States, predominantly because of a steady increase in the prevalence of end-stage renal disease (ESRD) [1]. Native arteriovenous fistula (AVF) is the recommended vascular access for HD patients by the Dialysis Outcomes Quality Initiative (DOQI) guidelines. The current national kidney foundation (DOQI) guidelines endorse this practice and recommend that initial cannulation be delayed for at least four weeks following surgery [2]. A fistula is considered mature when it can achieve a 300?mL/min dialysis blood flow within 1–6 months of its creation. Failure to mature (primary failure) is defined as the inability to meet this goal. Native AVF composed only 17% of all initial permanent hemodialysis access procedures performed in Medicare patients from 1996 to 1997 [3]. In 2002, the dialysis outcomes and practice patterns study (DOPPS) [2], one of the largest prospective observational studies published on hemodialysis practices and outcome in 309 international dialysis facilities, reported that AVF accounted for 24% of all access procedures in the United States, compared with 80% in Europe [4]. Gold standard for AVF maturation is the clinical
Assessment of gynecologic malignancies: A multi-center study in Tehran (1995-2005)
Momtahen S,Kadivar M,Kazzazi A,Gholipour F
Indian Journal of Cancer , 2009,
Abstract: Objective: The observed differences in cancer incidence are mainly due to different individuals and social risk factors. This study aims to demonstrate the characteristics of female genital malignancies according to the pathological records in Tehran, Iran. Materials and Methods: In this cross-sectional study, all records of pathological specimens categorized as ovarian, uterine corpus or uterine cervix cancers from 1995 to 2005, in five teaching hospitals in Tehran, were studied. Age, marriage, parity, menopausal status, smoking, oral contraceptive usage, pathological staging, and histological grading were reviewed by a trained general practitioner. SPSS 14 was used for statistical analysis. Result: Mean age (SD) at the time of diagnosis was 50 (15). Fifty-nine percent of ovarian, 33.9 and 47.7% of uterine corpus and uterine cervix malignant patients were premenopausal. About 90% of all were nonsmokers and 82.7% were multiparae. Various types of gynecologic malignancies included ovarian (55.5%), uterine corpus (24.9%), and uterine cervical cancers (19.6%) were diagnosed. In tumors of the uterine corpus and uterus cervix, the most frequent stage of diagnosis was stage IIA. Conclusion: Ovarian cancer was the most frequently occurring gynecologic tumor. Although distribution of age in ovarian cancer was similar to that mentioned in the literature, occurrence of the cancer was more frequent in the premenopausal state.
ran Tebriz üniversitesinde Temel Bilimler B lümleri Taraf ndan Haz rlanan Tezlere Y nelik Bir At f Analizi = A Citation Analysis for Thesis Prepared by Departments of the Natural Sciences in University of Tabriz, Iran
Gholipour, Jahangir
Bilgi Dünyas? , 2012,
Abstract: Bu ara t rmada Tebriz üniversitesinde 2005-2009 y llar aras nda tamamlanan 627 tezinat f analizi yap lm t r. Se ilen 627 tezde yer alan toplam 44.488 at f, yay nlar n türü, dili ve y l gibi zellikler a s ndan incelenmi tir. Bu zelliklerin zaman i inde ne gibi farkl l klar g sterdi i ara t r lm t r. al mada ayr ca, tezlerde yer alan at flar n d nemler itibariyle ya lanma h zlar nda bir farkl l k olup olmad ara t r lm t r. / In this study, citation analysis of theses had been done through 627 theses in University of Tabriz during period of 2005-2009. In these 627 theses we have 44,488 citations and we investigated those thesis based on publication type (such as web, journal, book and etc), language and the date they had been examined. These differences were shown by change of time and years. In addition citations were investigated by half-life characteristics too.
Behavior of Steel Encased Composite Beams
Yaghob Gholipour
Journal of Applied Sciences , 2003,
Abstract: This paper presents an experimental investigation of flexural behavior of steel encased reinforced concrete beams accompanied by a comparison with the results of the relevant finite element analysis. The experiments include three steel encased reinforced concrete beams and a reinforced concrete beam without steel profile. The experimental results were used to determine the flexural capacity of beams. Associate specimens of concrete cylinders and beams were tested for their strength. Failure of the encased beams is shown to occur progressively through a combination of bond-slip failure and local buckling of the steel sheeting. The flexural strength of the beam specimens has been computed by an model analytic and verified by a model of finite element analysis. The theoretical model based on a simple cross sectional analysis was shown to be in good agreement with the experimental data for the flexural capacity and also the finite element model for the calculation of flexural capacity is in good agreement with the experiments.
Catalytic effect of the spinel ferrite nanocrystals on the growth of carbon nanotubes
R. Hosseini Akbarnejad,V. Daadmehr,F. Shahbaz Tehrani,F. Aghakhani,S. Gholipour
Physics , 2011,
Abstract: We prepared three ferrite nanocatalysts: (i) copper ferrite (CuFe2O4), (ii) ferrite where cobalt was substituted by nickel (NixCo1-xFe2O4, with x= 0, 0.2, 0.4, 0.6), and (iii) ferrite where nickel was substituted by zinc (ZnyNi1-yFe2O4 with y= 1, 0.7, 0.5, 0.3), by the sol-gel method. The X-ray diffraction patterns show that the ferrite samples have been crystallized in the cubic spinel structural phase. We obtained the grain size by FE-SEM images in the range of 10-70 nm, and their magnetic properties by VSM. Next, carbon nanotubes were grown on these nanocatalysts by the CCVD method. We show that the catalytic effects of these nanocrystals on the carbon nanotube growth depend on cation distributions in the octahedral and tetrahedral sites, structural isotropy and catalytic power due to cations. Our study can have applications in finding a suitable candidate of doped ferrite nanocrystals as catalysts for carbon nanotube growth. More interestingly, the yield of the fabrication of carbon nanotubes can be considered as an indirect tool to study catalytic activity of ferrites.
Structural, magnetic, and optical properties of zinc- and copper- substituted nickel ferrite nanocrystals
F. Shahbaz Tehrani,V. Daadmehr,A. T. Rezakhani,R. Hosseini Akbarnejad,S. Gholipour
Physics , 2012,
Abstract: Ferrite nanocrystals are interesting material due to their rich physical properties. Here we add nonmagnetic dopants Zn and Cu to nickel ferrite nanocrystals, Ni1-xMxFe2O4 (0<=x<=1, M{\in}{Cu, Zn}), and characterize how relevant properties of the samples are modified accordingly. Basically, these dopings cause a rearrangement of Fe+3 ions into the two preexisting octahedral and tetrahedral sites. In fact, this, we show, induces pertinent magnetic properties of the doped samples. In the case of the Cu-doping, the Jahn-Teller effect also emerges, which we identify through the FTIR Spectroscopy of the samples. Moreover, we show an increase in the lattice parameters of the doped samples, as well a superparamagnetic behavior for the doped samples is shown, while the Jahn-Teller effect precludes a similar behavior in the CuFe2O4 nanocrystals. The influences of Zn and Cu substitutions are investigated on the optical properties of nickel ferrite nanocrystals by photoluminescence measurement at room temperature.
Y358 against Y123 structural phase in a Y-based superconductor
S. Gholipour,V. Daadmehr,A. T. Rezakhani,H. Khosroabadi,F. Shahbaz Tehrani,R. Hosseini Akbarnejad
Physics , 2011,
Abstract: We report an experiment in which two distinct superconducting phase YBa2Cu3O7 (Y123) and Y3Ba5Cu8O18 (Y358) coexisted. This enabled us to characterize the recently introduced Y358 phase in contrast to the Y123 phase, thus to resolve some discrepancies reported in associated properties of Y358. Specifically, our experiment indicates the transition temperature TCmid=105K and 94K for Y358 and Y123, respectively, and that Y358 has three CuO2 planes and two CuO chains, with Pmm2 symmetry and lattice parameter (a,b,c)=(3.845,3.894,31.093){\AA}, in agreement with density functional theory predictions for this specific structure.
Missed Pathology in Laparoscopic Cholecystectomy
Alireza Barband,Changiz Gholipour
Research Journal of Medical Sciences , 2012,
Abstract: The wide acceptance of Laparoscopic Cholecystectomy (LC) has result in increasing the rate of LC bears the possibility of concomitantly missing intraabdominal pathology. The prospective follow up of 1852 patients who underwent LC was studied and all patients treated and readmitted for intraabdominal malignancy included. Over the ten years, 1852 patients with symptomatic cholecystitis operated using LC. Six patients required readmission for missed pathology of another organ (three for Colonic cancer, one Appendix tumor, one Gastric carcinoma and one Pancreatic cancer). This indicates a risk of more missed pathology during the course of laparoscopic operation compared to standard laparotomy. Although, the incidence of missed malignant pathology has a very low doesn`t justify routine screening for cancer (colon cancer ) before LC in terms of cost-effectiveness, the risk of missing pathologies during laparoscopic procedures has to be minimized by placing additional emphasis on careful evaluation of pain and associated symptoms before performing LC.
Factors contributing to the fluctuations in residential construction in Iran
Hassan Gholipour Fereidouni
Australasian Journal of Construction Economics and Building , 2011,
Abstract: Residential construction is one of the most important pillars of Iran’s economy. Although this sector had an increasing trend over the past two decades, however, the growth rate of residential construction was very volatile. The purpose of this paper is to empirically investigate those factors contributing to this fluctuation over the 1991:Q2-2008:Q4. By applying cointegration approach, the empirical results show that housing prices, construction costs, GDP and gold prices are important factors to explain swings in residential construction in Iran.
Evaluation of multi-walled carbon nanotubes performance in adsorption and desorption of hexavalent chromium
Gholipour Mina,Hashemipour Hassan
Chemical Industry and Chemical Engineering Quarterly , 2012, DOI: 10.2298/ciceq111104025g
Abstract: In this study, the removal of hexavalent chromium from aqueous solutions using multi-walled carbon nanotubes (MWCNTs) has been investigated as a function of adsorbent dosage, initial Cr(VI) concentration, initial pH, contact time and temperature. Low pH, low initial concentrations of Cr(VI), increasing contact time and high temperature were found as optimal conditions. A comparison of kinetics models applied to the adsorption of Cr(VI) ions on the MWCNTs was evaluated for the pseudo first-order, the pseudo second-order, and Elovich kinetics models, respectively. Pseudo second-order kinetics model was found to correlate the experimental data well. Equilibrium isotherms were measured experimentally and results show that data were fitted well by the BET model. Thermodynamic parameters were estimated and results suggest that the adsorption process is spontaneous, physical and endothermic. The reversibility of Cr(VI) adsorption onto MWCNTs by desorption process and the effect of operating factors such as regeneration solution characteristics, contact time and temperature on this process was investigated. Results show that MWCNTs are effective Cr(VI) adsorbents and can be reused through many cycles of regeneration without any high decreasing in their performance.
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