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Search Results: 1 - 10 of 579970 matches for " G. A. Mansoori "
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Local pressure of confined fluids inside nanoslit pores -- A density functional theory prediction
F. Heidari,G. A. Mansoori,E. Keshavarzi
Physics , 2013,
Abstract: In this work, the local pressure of fluids confined inside nanoslit pores is predicted within the framework of the density functional theory. The Euler-Lagrange equation in the density functional theory of statistical mechanics is used to obtain the force balance equation which leads to a general equation to predict the local normal component of the pressure tensor. Our approach yields a general equation for predicting the normal pressure of confined fluids and it satisfies the exact bulk thermodynamics equation when the pore width approaches infinity. As two basic examples, we report the solution of the general equation for hard-sphere (HS) and Lennard-Jones (LJ) fluids confined between two parallel-structureless hard walls. To do so, we use the modified fundamental measure theory (mFMT) to obtain the normal pressure for hard-sphere confined fluid and mFMT incorporated with the Rosenfeld perturbative DFT for the LJ fluid. Effects of different variables including pore width, bulk density and temperature on the behavior of normal pressure are studied and reported. Our predicted results show that in both HS and LJ cases the confined fluids normal pressure has an oscillatory behavior and the number of oscillations increases with bulk density and temperature. The oscillations also become broad and smooth with pore width at a constant temperature and bulk density. In comparison with the HS confined fluid, the values of normal pressure for the LJ confined fluid as well as its oscillations at all distances from the walls are less profound.
Theory of Viscosity of Confined Fluids in Small / Nano Systems (Theory of Interfacial Viscosity)
B. Mirzayi,G. A. Mansoori,M. Vafaie-Sefti
Physics , 2008,
Abstract: In this paper we present the molecular theory of viscosity of confined fluids in small or nano systems. This theory is also applicable to the interfacial viscosity. The basis of this research work is the Enskog kinetic theory and the Boussinesq constitutive equation. The Enskog kinetic theory is first transformed into a two-dimensional form. Then the potential energy collisional transfer part of the flux vector and the contribution to the surface pressure tensor due to collisional transfer are derived. Then the kinetic energy part of the flux vector and consequently the contribution to the surface pressure tensor due to flow of molecules is obtained. The microscopic expression of total surface pressure tensor is obtained by adding of the potential energy collisional transfer part and the kinetic energy contribution. Then the expression of interfacial shear and dilatational viscosities are concluded by the comparison of corresponding terms of the two microscopic and macroscopic surface pressure tensor equations. Finally the dimensionless forms of interfacial shear viscosity, interfacial dilatational viscosity and the surface tension equations are derived and they are plotted versus the reduced superficial number density.
Self-Assembly of Diamondoid Molecules and Derivatives (MD Simulations and DFT Calculations)
Yong Xue,G. Ali Mansoori
International Journal of Molecular Sciences , 2010, DOI: 10.3390/ijms11010288
Abstract: We report self-assembly and phase transition behavior of lower diamondoid molecules and their primary derivatives using molecular dynamics (MD) simulation and density functional theory (DFT) calculations. Two lower diamondoids (adamantane and diamantane), three adamantane derivatives (amantadine, memantine and rimantadine) and two artificial molecules (ADM?Na and DIM?Na) are studied separately in 125-molecule simulation systems. We performed DFT calculations to optimize their molecular geometries and obtained atomic electronic charges for the corresponding MD simulation, by which we predicted self-assembly structures and simulation trajectories for the seven different diamondoids and derivatives. Our radial distribution function and structure factor studies showed clear phase transitions and self-assemblies for the seven diamondoids and derivatives.
Quantum Conductance and Electronic Properties of Lower Diamondoid Molecules and Derivatives
Yong Xue,G. Ali Mansoori
Physics , 2008, DOI: 10.1142/S0219581X08005183
Abstract: Diamondoids and their derivatives have found major applications as templates and as molecular building blocks in nanotechnology. Applying ab initio method, we calculated the quantum conductance and the essential electronic properties of two lower diamondoids (adamantane and diamantane) and three of their important derivatives (amantadine, memantine and rimantadine). We also studies two artificial molecules that are built by substituting one hydrogen ion with one sodium ion in both adamantane and diamantane molecules. Most of our results are based on an infinite Au two-probe system constructed by ATK and VNL software, which comprise TRANSTA-C package. By changing various system structures and molecule orientations in linear Au and 2 by 2 Au probe systems, we found that although the conductance of adamantane and diamantane are very small, the derivatives of the lower diamondoids have considerable conductance at specific orientations and also showed interesting electronic properties. The quantum conductance of such molecules will change significantly by changing the orientations of the molecules, which approves that residues like nitrogen and sodium atoms have great effects on the conductance and electronic properties of single molecule. There are obvious peaks near Fermi energy in the transmission spectrums of artificial molecules, indicating the plateaus in I-V characteristics of such molecules.
Nanotechnology for Alzheimer’s disease detection and treatment
Amir Nazem,G.Ali Mansoori
Insciences Journal , 2011,
Abstract: In this paper, we present the role of nanotechnology in the development and improvement of techniques for early diagnosis and effective treatment of Alzheimer’s disease (AD). Since AD pathology is almost irreversible and present-day medications for AD only lower its associated symptoms, application of disease-modifying treatments could be successful only if AD early diagnosis is possible. The nanodiagnostic methods reported and compared in this paper include both of in vitro and in vivo nature. Of the in vitro approaches, the DNA-nanoparticle conjugates (bio-barcode assay), nanoparticle surface plasmon resonance, scanning tunneling microscopy, and two-photon Rayleigh spectroscopy are presented here. Of the in vivo methods, μMRI and optical imaging techniques are discussed here. The nanotreatment methods for AD are numerous. They are categorized in this report under neuroprotective methods from toxicity of amyloid-β peptide (Aβ) oligomers, oxidative stress of free radicals and nanocarriers for targeted drug delivery. The important agents for neuroprotection include nanogels, fullerene, nano-ceria, dendrimers, gold nanoparticles, and diamondoid derivatives. The major nanocarriers presented here include cholinesterase inhibitors nanocarriers, acetylcholine nanocarrier, metal chelator nanocarriers, (Iron chelators and copper chelators), curcuminoids nanocarrier, anti-oxidant nanocarriers, and gene nanocarriers. Considering that the AD is a multi-factorial disease with several pathogenetic mechanisms and pathways, a multifunctional nanotechnology approach will be needed to target its main molecular culprits. These molecular targets must include, but not limited to, Aβ oligomers, reactive oxygen species (ROS), excessive metal ions, tau phosphorylating kinases and cell cycle proteins.
Geomorphotourism of Kalat Mountain: investigating the correlation between springs and geologic formations
A. Behniafar,A. Sepehr,MR. Mansoori
Geography and Environmental Planning , 2013,
Abstract: Extended abstract1- Introduction Geomorphotourism has become an increasingly important and widely discussed sub-sector of the global tourism industry, and despite debate over its definition, it is now broadly accepted that geotourism entails three main criteria. Firstly, geotourism should involve a nature-based element in which its attractions are primarily based in the natural environment and geomorphic features. Secondly, there should be an element of education, learning or appreciation between the geotourist and the attraction. Finally, geotourism should appear to be Environmentally and socio-culturally sustainable, in a way which ‘enhances the natural and cultural resource base of the destination and promotes the viability of the operation’. Geomorphotourism considering the geomorphic landforms of region causes sustainable development in the region. In this research based on geomorphic landforms and springs of Kalat Mountain have been investigated the correlation between these features to analysis geomorphotourism potential of studied area.2- Methodology2-1- Study AreaThe studied area located in Khorasan Razavi, with 3500 km2 area. According to the location of this area in the folded mountain of Kopeh-dagh unit, natural features and geomorphologic landforms of this region including erosional phenomena, karst features have been caused the high geotourism potential for the studied area. The studied region located in 36 25 to 37 19 latitudes and 59 18 to 60 29 longitudes. Figure 1 shows the location of studied area. Fig. 1: the studied areas location From geology view, in higher than 1500 m, the Jurassic formation of lime stone and dolomite are raised. In levels of lower than 1500 m, have been formed the Paleogene sediments, sandstone, shale and gypsum. 2-2- MethodologyThis research has been done in three steps including geology and springs mapping, land units map preparing, classification and analyzing. To reach the purposes, geology and topography maps, aerial photos, multi-spectral imagery and RS/GIS software were used. To determine geomorphotourism locations, GPS and field operation were applied. The statistical analysis has been done for correlation and regression testing. 3- Results and DiscussionThe correlation of each geological formation by Pearson test showed that there is a strong and significant correlation (R2=0.8). The analysis indicated that spring density of Shorijeh, Sanganeh, Tirgan and Mozdooran is high. Also the highest discharge concentration is in relation to Tirgan and Mozdooran geology units. Areas with slopes greater than 15% ha
New analytical approach to nonlinear behavior study of asymmetrically LCBs on nonlinear elastic foundation under steady axial and thermal loading
Rafieipour, H.;Lotfavar, A.;Mansoori, M. H.;
Latin American Journal of Solids and Structures , 2012, DOI: 10.1590/S1679-78252012000500001
Abstract: in this paper, nonlinear behavior analysis of an asymmetrically laminated composite beam (lcb) on nonlinear foundation under axial and in-plane thermal loading is considered. to solve the obtained governing equation, a novel method based on laplace transform is used. the resulted approximate analytical solution allows us the parametric study of different parameters which influence the nonlinear behavior of the system. the numerical results illustrate that proposed technique yields a very rapid convergence of the solution as well as low computational effort. the accuracy of the proposed method is verified by those available in literatures.
Sunflower Oil Seed (Raw-or Heat-Treated) in Lactating Dairy Cow's Diets: Effects on Milk Fatty Acids Profile and Milk Production
H. Mansoori,A. Aghazadeh,K. Nazeradl
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.470.479
Abstract: The objective of this study was to investigate the effects of dietary supplementation with sunflower oil seed (Raw-or Heat-treated) in two levels of 7.5 or 15% on unsaturated fatty acids in milk fat and performances of high-yielding lactating cows. Twenty early lactating Holstein cows were used in a complete randomized design. Treatments included: CON, control (without sunflower oil seed). LS-UT, 7.5% raw sunflower oil seed. LS-HT, 7.5% heat-treated sunflower oil seed. HS-UT, 15% raw sunflower oil seed. HS-HT, 15% heat-treated sunflower oil seed. Experimental period lasted for 4 weeks with first 2 weeks used for adaptation to the diets. Supplementation with 7.5% raw sunflower seed (LS-UT) tended to decrease milk yield with 28.37 kg day-1 compared with the control (34.75 kg day-1). Milk fat percentage was increased with the HS-UT treatment that obtained 3.71% compared with CON that was 3.39% and without significant different. Milk protein percent was decreased by high level sunflower oil seed treatments (15%) with 3.18% whereas CON treatment is caused 3.40% protein. The cows fed added Low Sunflower Heat-Treated (LS-HT) produced milk with the highest content of total unsaturated fatty acid with 32.59 g/100 g of milk fat compared with the HS-UT with 23.59 g/100 g of milk fat. Content of C18 unsaturated fatty acids in milk fat increased from 21.68 g/100 g of fat in the HS-UT to 22.50, 23.98, 27.39 and 30.30 g/100 g of fat from the cow fed HS-HT, CON, LS-UT and LS-HT treatments, respectively. C18:2 isomers of fatty acid in milk were greater by LS-HT supplementation with significant effect (p<0.05). Total of C18 unsaturated fatty acids content was significantly higher in milk of animal fed added low heat-treated sunflower (7.5%) than those fed with high sunflower. In all, results of this study showed that diet cow's supplementation with sunflower oil seed tended to reduce milk production of lactating cows but can improve C18 unsaturated fatty acid content in milk fat. About 7.5% level of sunflower oil seed that heated seemed to be the optimal source to increase UFA production.
EVALUATION OF MOLLUSICIDING IN THE CONTROL OF BILHARZIASIS AND PROBLEMS IMPEDING COMPLETE CONTROL OF THE DISEASE IN IRAN
A. Mansoori,I. Farahmandian,F. Arfaa
Iranian Journal of Public Health , 1976,
Abstract: The effect of the mollusciciding of 364 different snail habitat with Bayer 73 (Bayluscide), undertaken during the period January 1968 to January 1973, for the control of urinary bilharziasis bas been evaluated in Khuzestan, southwest Iran. The criteria for assessment were as follows:1. Complete kill was obtained when no live B.truncatus was found in monthly surveys for one entire year after mollusciciding; 2. Failure occurred when all or more live snails were found by monthly surveys during one year. Complete kill ranged from 53.7% in 1969 to 59.7% in 1968, and the difference in the percentage of complete kill observed in various years was not significant. The highest percentage of complete kill was achieved in ponds. The results obtained from this evaluation indicate that 1) there is no possibility of Bulinus truncatus snails building up a resistance to the molluscicide used in this study; 2) by the increase in the number of snail habitats with running water in the endemic area of Khuzestan, as the result of a huge program of extension of irrigation networks already underway, the destruction of the snail intermediate host will become increasingly difficult in the future.
Endoscopic Renal Cyst Ablation
Alireza Tadayon,M A’yanifard,Daryoosh Mansoori
Urology Journal , 2004,
Abstract: Purpose: To evaluate the result of simple renal cyst ablation by endoscope and compare the results with other techniques of renal cyst treatment. Materials and Methods: A prospective study was performed at Shaheed Faghihi hospital from January 2001 to January 2003. Ten patients with symptomatic simple renal cyst were selected for this study. The exclusion criteria were history of previous renal surgery, parapelvic cyst, and cyst size less than 50 mm. Urinalysis, urine culture, serum electrolytes, ultrasonography, and CT scan were done before operation. The patients underwent endoscopic renal cyst ablation and cytology of cyst fluid and histopathological examination of cysts’ walls were done in all patients. The patients were followed with ultrasonography after two weeks and 2, 6, and 12 months postoperatively. Disappearance of the cyst or decreasing its size to less than 50% of its primary size was considered as improvement. Results: All the patients were female with a mean age of 55 (range 22 to 75) years. The operation was successful in 9 patients with no major complications. Perinephric hematoma and excessive leakage were seen in two patients. The operative time was 38±10.8 minutes and hospital stay was 3±1.3 days. Mean size of cyst before operation was 75±19.7 mm and changed to 12.7±15.3 mm after operation (p<0.001). Flank pain subsided in 88.8% (p<0.008). Conclusions: Cyst ablation can be used for the treatment of simple renal cysts not responding to aspiration and sclerosing therapy, and if there is no laparoscopic facility. More studies are needed to confirm these results.
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