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Search Results: 1 - 10 of 1936 matches for " Alipour MR "
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One-year outcome of Senning operation in children with transposition of the great vessels
Shahmohammadi A,Mortezaian H,Alipour MR
Tehran University Medical Journal , 2011,
Abstract: "nBackground: Nowadays, the treatment of choice for anatomical correction of transposition of great arteries is arterial switch but some children are not good candidates for this operation. In these cases atrial switch or Senning procedure is an accepted method, thus outcome of this procedure needs to be better delineated."n "nMethods: This prospective study included 65 patients that underwent Senning operation in Shahid Rajaee Hospital in Tehran, Iran from 2002 to 2009 and were followed-up for one year."n "nResults: The early and late mortality rates were 16.9% and 1.5%, respectively. 51.8% of early deaths were due to simple Senning procedure, 38.9% due to a Senning with the closure of ventricular septal defect, with or without the repair of pulmonary artery stenosis, 9.3% related to palliative Senning and one late death due to simple Senning. The most common arrhythmia was accelerated junctional rhythm (18.5%). 15% of cases had Senning pathway obstruction and 1.7% had baffle leaks. Regardless of the mortalities, three patients (5.7%) had significant tricuspid regurgitation. Right ventricular systolic dysfunction was found in 13.3% of the cases, primarily in Senning with ventricular septal defect closure (37.5%). One case (1.9%) had visible cyanosis and three (5.7%) had exertional dyspnea but 94.3% of cases remained in functional class I."n "nConclusion: Since the majority of deaths following Senning procedure occur during the first month, especially on the second day post-operatively, assiduity during early post-operative period is crucial. Tricuspid regurgitation or right ventricular systolic dysfunction was not detected in most patients, suggesting optimistic prognosis for these patients.
Hydrogeochemistry of seasonal variation of Urmia Salt Lake, Iran
Samad Alipour
Aquatic Biosystems , 2006, DOI: 10.1186/1746-1448-2-9
Abstract: Seven hundred and four samples were taken and partially analyzed for the main cations and anions. Surface water (0.5 m. depth) was analyzed for Na, K, Mg, Ca, Br and Li, and averaged 87.118 g/lit, 1.48 g/lit, 4.82 g/lit, 4.54 g/lit, 1.19 ppm and 12.7 ppm respectively for the western half of the lake. Sodium ranged between 84 to 91.2 g/lit, and showed higher concentrations in the south than in the north. This unexpected result may be caused by shallower depth in the south and a higher net evaporation effect. Calcium ranged between 4.2 to 5 g/lit, apparently slightly higher in the north. K is higher in the south, possibly due to rivers entering from south that may carry slightly higher K in solution.In the middle-range samples (0.5–5 m.), K averaged 1.43 g/lit and ranged from 1.40 to 1.46 g/lit. At this intermediate depth the distribution of K is clearly higher to the south of the causeway that is currently under construction. It is not clear whether this increase is the effect of the causeway or the effect of the salty Aji-Chay River to the east, and the Khoy salt domes to the north of the lake. At depth (5 m–10 m), K averaged 1.48 g/lit and ranged from 1.4 to 1.49 g/lit, differing only in the second decimal from the average of the middle and surface samples.Ignoring the small difference between the averages of the three sample depths, the distribution of K is highly homogeneous in the lake water due to the mixing process. Therefore causeway construction has not yet strongly affected K distribution, or it may be at the starting point. Magnesium concentration ranged from 4.6 to 5-g/lit, and was elevated in the south. This differs somewhat compared to calcium. Lithium, with an average of 12–13 ppm, is slightly higher in the south, and has not shown any significant variation in all three seasons. Iodine was below the detection limit in the lake.Urmia Lake, geochemically, is highly uniform both to the south and north of the causeway, in both the surface and deep brines.
Classification of Soils Based on Double Ring Measured Permeability in Zarrineh-Roud Delta, Western Azarbayejan, Iran
S. Alipour
Pakistan Journal of Biological Sciences , 2007,
Abstract: A physical method of soil classification based on soil permeability as a preliminary quick way prior to slow and expensive chemical conventional method was conducted in regional scale using 40 test stations. Double ring method used for permeability measurements in the area. The results clearly differentiated development of various soil types and quality in the area under investigation. The results clearly indicate the physical method of double ring measurement permeability is able to identify various soil types in regional scale and the later chemical methods could be used in local scale for detailed classification. NaCl content of soils was reflected by the amount of infiltration rate. Permeability ranged as high, medium and low, corresponded with loamy sand, loamy and clay soils respectively. Permeability in the vicinity of the higher water flows was high due to leaching of NaCl in the soil. NaCl is considered to be the main factor of impermeability reduction in the area associated with clay and soil textures.
Nanoclay as Substitute of Calcium Carbonate in NBR Compounds
Alipour A.
Proceedings of the International Conference Nanomaterials : Applications and Properties , 2012,
Abstract: The use of organo-modified montmorillonite as substitute of calcium carbonate in NBR compounds were studied. Rubber containing (3,5,7 phr) of nanoclay (Closite 30 B) were compared with those of reinforced by 10, 20 and 30 phr calcium carbonate as filler. The modified silicate is analysed by X-ray which suggested intercalation of elastomer chains into silicate layers. Rheological measurement as well as mecchanical properties showed both nanoclay and calcium carbonate give rise to a marked increase in elastic modulus and viscosity which could be attributed to the good interaction between polymer/filler. It was noticed that nanoclay can reinforce the NBR much more noticeably than calcium carbonate.
Characterization of Elastomer Nanocomposite Blends Based on NR/EPDM/Organoclay
Alipour A.
Proceedings of the International Conference Nanomaterials : Applications and Properties , 2013,
Abstract: Elastomer nanocomposites based on NR/EPDM/organoclay were prepared by two-roll mill to investigate the effect of different percentages of nanoclay (0, 1, 3, 5 and 7 Wt%) and different matrix compositions (100/0, 75/25, 50/50, 25/75 and 0/100) on the microstructure, mechanical properties and best applicability of the mathematical models. Results of X-ray diffraction showed that enlargement of the silicate layers, penetration of polymer chains into layers and formation of an intercalated and exfoliated structure which was confirmed by TEM analysis. Mechanical properties as well as heat build up of the samples improved by addition of nanoclay. Addition the compounds with EPDM leads to an increase in compression strength, modulus and compressin set and decrease in tensile and tear strength. The prepared samples receive more aging resistance by addition of more clay and EPDM.
Which Information Theoretic Quantity Should We Choose for Steric Analysis of Water Nanoclusters (H2O)n (n = 6, 32, 64)?
Which Information Theoretic Quantity Should We Choose for Steric Analysis of Water Nanoclusters (H2O)n (n = 6, 32, 64)?

ALIPOUR Mojtaba()
- , 2018, DOI: 10.3866/PKU.WHXB201708175
Abstract: As evidenced from recent literature, interest in employing information theory measures for understanding different properties of atomic and molecular systems is increasing tremendously. Following our earlier efforts in this field, we here evaluate the feasibility of using information theory functionals such as Fisher information, Shannon entropy, Onicescu information energy, and Ghosh-Berkowitz-Parr entropy as measures of steric effects for the steric analysis of water nanoclusters. Taking the structural isomers of water hexamers as working models and using information theoretic quantities, we show that the relative energies of water nanoclusters and the computed steric energies are related. We also show the strong effects of steric repulsion on conformational stabilities. At the same time, we have also assessed the usefulness of simultaneously considering the different information theoretic quantities, and achieved more accurate descriptions of the stability of water nanoclusters. In order to consider the effects of cluster size on the obtained results and the extent of applicability of information theoretic quantities, we have also benchmarked larger water nanoclusters with 32 and 64 units. Scrutinizing the obtained data from information theory functionals, we found that Fisher information shows the best overall performance. Our findings underline that the information theoretic quantities, especially Fisher information, can be used as quantitative measures of relative energies and consequently the order of stability of nanoclusters, which affirmed the utility of information theory for investigating various physical and chemical problems.
As evidenced from recent literature, interest in employing information theory measures for understanding different properties of atomic and molecular systems is increasing tremendously. Following our earlier efforts in this field, we here evaluate the feasibility of using information theory functionals such as Fisher information, Shannon entropy, Onicescu information energy, and Ghosh-Berkowitz-Parr entropy as measures of steric effects for the steric analysis of water nanoclusters. Taking the structural isomers of water hexamers as working models and using information theoretic quantities, we show that the relative energies of water nanoclusters and the computed steric energies are related. We also show the strong effects of steric repulsion on conformational stabilities. At the same time, we have also assessed the usefulness of simultaneously considering the different information theoretic quantities, and
Renovation and Rehabilitation Strategies for Worn-Out Texture of Ab-Anbar-No District in Sari Using SWOT Technique  [PDF]
Abbas Alipour Nakhi, Niloufar Ahmari, Saeid Rezaei
Open Journal of Geology (OJG) , 2016, DOI: 10.4236/ojg.2016.64024
Abstract: Along with the growth and expansion of cities during the time, several parts of them have depreciated and they require repairing and inspection. Damaged places and repairing them are a problem that is significant and liable of each period has been looking for excogitation and resolving problems according to the existing circumstances. However, expressed concern that it is still a problem, is worn texture, which is extending fast in all cities of the world, particularly in developing countries, and this problem has gripped cities and authorities. In spite of all weaknesses and deficiency, since the majority of worn-out tissues have significant cultural, social and economic values which give identity to the cities, so paying attention to these areas and how to intervene in them is very important. The purpose of this paper is to study and consider ways of rehabilitation and renovation of the old texture of Ab-Anbar-No district in Sari, which it has been done using analytical-descriptive method. In this study, the needed information has been collected by observation, providing necessary map, library research and rehabilitation and reconstruction strategies have gained by SWOT model for analysis and internal factors (strengths and weaknesses) and external factors (threats and opportunities) of this tissue have been considered comprehensively. The results of this study show that strategies for rehabilitation and renovation of Ab-Anbar-No district are one part of the guidance, control and planning system of urban rehabilitation and modernization, as a guide for decision-making. The considered limitation of weakness and strengths in physical, environmental and functional fields have a high vulnerability and also have optimization opportunities in the economic, social and legal-administrative fields in order to take advantages for reaching perfection.
A Learning Automata Based Algorithm For Solving Capacitated Vehicle Routing Problem
Mir Mohammad Alipour,Mir Mohammad Alipour
International Journal of Computer Science Issues , 2012,
Abstract: This paper presents an approximate algorithm based on distributed learning automata for solving capacitated vehicle routing problem. The vehicle routing problem (VRP) is an NP-hard problem and capacitated vehicle routing problem variant (CVRP) is considered here. This problem is one of the NP-hard problems and for this reason many approximate algorithms have been designed for solving it. Distributed learning automata that is a general searching tool and is a solving tool for variety of NP-complete problems, is used to solve this problem and tested on fourteen benchmark problems. Our results were compared to the best known results. The results of comparison have shown the efficiency of the proposed algorithm.
Effects of sterol regulatory element-binding protein (SREBP) in chickens
Fahimeh Alipour, Ahmad Hassanabadi
Lipids in Health and Disease , 2012, DOI: 10.1186/1476-511x-11-20
Abstract: Sterol regulatory element binding proteins (SREBP) are basic helix-loop-helix-leucine zipper (bHLH-Zip) transcription factors that play an important role in controlling genes involved in the biosynthesis of cholesterol and fatty acids [1]. The SREBP precursors of about 1150 amino acids in length need cleavage by a sterol-dependent proteolytic process [2]. The N-terminal part (about 450 amino acids, having the bHLH-Zip motif and the transcription activating domain) is then released into the nucleus, where the transcriptional activation of the target genes occurs. SREBPs are synthesized while inactive precursor proteins that are embedded in endoplasmic reticulum membranes [3,4]. To become transcriptionally active, precursor SREBP is escorted to the Golgi apparatus, where it undergoes a sequential 2-step proteolytic cleavage catalyzed by site-1 protease and site-2 protease [5]. Therefore, two SREBPs, designated SREBP-1 and -2, have been isolated and cloned from several mammalian species [6,7]. The SREBP-1 gene generates two isoforms SREBP-1a and -1c, by another transcription start sites [8].This procedure releases an amino-terminal SREBP fragment that is referred to as the mature form. Mature SREBP is transported into the nucleus, wherever it binds sterol regulatory elements (SRE) of genes involved in biosynthesis of lipid. Three isoforms of SREBP have been identified in mammals. Two of these isoforms, designated SREBP-1a and SREBP-1c, are expressed from the same gene. They vary in sequence at their amino termini by reason of utilize of alternative promoters and leading exons. The third isoform, designated SREBP-2, is expressed from a separate gene. SREBP-1c and SREBP-2 are the major isoforms of SREBP expressed in mammalian liver [5]. Several studies recommend that the SREBP-1 isoforms are more selective in activating fatty acid biosynthesis genes, while SREBP-2 is more specific for controlling cholesterol biosynthesis. These researches include on hepatic lipogenic gen
Analysis of Performance and Quality Parameters for Service Level Agreement in Long Distance Calls Service
Nahid Amani,Elahe Alipour
Lecture Notes in Engineering and Computer Science , 2008,
Abstract:
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