Utility of the Visceral Adiposity Index and Hypertriglyceridemic Waist Phenotype for Predicting Incident Hypertension (Endocrinol Metab 2017;32:221-9, Mohsen Janghorbani et al.)

Mohsen Janghorbani 대한내분비학회 2017 Endocrinology and metabolism Vol.32 No.4

Experimental Study on Mechanical Properties of Cement-Stabilized Soil Blended with Crushed Stone Waste

Mohsen Salehi,Meysam Bayat,Mohsen Saadat,Masoud Nasri 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.6

Waste generated by the processing of natural stone poses environmental and economic problems. One promising use for stone waste is soil stabilization. In this paper, a number of tests including unconfined compressive strength (UCS) and California bearing ratio (CBR) of crushed stone were performed to study the effect of curing time, soaked and unsoaked conditions and freeze-thaw cycles on the geotechnical characteristics of cement-stabilized specimens. The results indicate that crushed stone waste can be combined with cement as a stabilizer to improve soil properties. Also the optimum moisture content (OMC) and maximum dry density (MDD) are dependent on the cement content and almost independent of the crushed stone waste content. The CBR increased significantly as the crushed stone waste and cement contents increased under both soaked and unsoaked conditions, but these had little effect on the UCS at curing times of less than 14 days. Cement-stabilized specimens with 10% crushed stone waste showed a significant increase in UCS. The CBR and UCS of unsoaked specimens were higher than for soaked specimens at different crushed stone waste and cement contents. The CBR and UCS values increased with an increase in curing time. However, the curing time had a more obvious effect on UCS than on CBR.

A Neuro-Fuzzy Online Fault Detection and Diagnosis Algorithm for Nonlinear and Dynamic Systems

Mohsen Shabanian,Mohsen Montazeri 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.4

This paper presents a new fault detection and diagnosis approach for nonlinear dynamic plant systems with a neuro-fuzzy based approach to prevent developing of fault as soon as possible. By comparison of plants and neuro-fuzzy estimator outputs in the presence of noise, residual signal is generated and compared with a predefined threshold, the fault can be detected. To diagnose the type, size, time and fault conditions, are used analytical approach and neural network for tracking fault developing online. The neuro-fuzzy nets are compared with some other identification methods in application of power plant gas turbine. Faults are considered in two forms, step, and ramp shape. This work was implemented with real data from gas turbine of Kazeroun (Iran) power plant (Mitsubishi unit) and result is presented to demonstrate the benefits of the proposed method.

Effects of discrete source-sink arrangements on mixed convection in a square cavity filled by nanofluid

Mohsen Izadi,Amin Behzadmehr,Mohammad Mohsen Shahmardan 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.1

Laminar mixed convection of Al2O3/water nanofluid flow in a cavity in which the upper wall is moving from right to left has been studied numerically. Fifteen different arrangements of two discrete sources and four discrete sinks have been considered. This work shows when one source is located at the right side of the bottom wall and other one at the down half of the left wall, total heat transfer achieves its maximum value. The lowest heat transfer rate is achieved when more than two vortexes are created in the cavity (case 13 for Ri=1 and case 5 for Ri=100). In general,for cases with one overall vortex, the cavities which have separate sources induce better cooling and have higher Nu number.

Effects of Uniaxial Cyclic Stretch Loading on Morphology of Adipose Derived Stem Cells

Mohsen Rabbani,Mohsen Janmaleki,Mohammad Tafazzoli-Shadpour,Morteza Teymoori,Seyedkamaladdin Rezvaninejad 한국조직공학과 재생의학회 2016 조직공학과 재생의학 Vol.13 No.4

Adipose derived stem cells (ADSC) are good candidates for the replacement of bone marrow derived mesenchymal stem cells due to their abundance, multipotency property, and easier accessibility. In order to explore the behavior of these cells in response to mechanical stimulation, in this study we have investigated the effects of uniaxial dynamic mechanical loading on ADSC’s morphology. Stem cells derived from the fat tissue of human and after an overnight culture were seeded on a silicone rubber strips. Afterwards, cells were subjected to a uniaxial dynamic loading in three different groups. Cell images were evaluated considering different morphological parameters. Fractal dimension decreased significantly after loading while in control groups there were a significant increase (p<0.05), approving that cyclic strain would lead to more aligned and organized cells. Cell orientation also increased significantly (p<0.05). Moreover cells’ orientation angle, 24 hour after loading does not change compared to the observations immediately after loading, which attests to the practicality of the cyclic strain in functional tissue engineering. Cell width decreased and cell length increased which led to a significant increase in cell shape index (p<0.05). Results confirmed that uniaxial dynamic loading affects cell morphological parameters comparing their values before and after loading. In addition, the number of cycles are also an important factor since different number of cycles lead to different amounts of certain morphological parameters. Conclusively, cyclic strain can be a practical method in the field of functional tissue engineering.

Cyclic Stretch Effects on Adipose-Derived Stem Cell Stiffness, Morphology and Smooth Muscle Cell Gene Expression

Mohsen Rabbani,Mohammad Tafazzoli-Shadpour,Mohammad Ali Shokrgozar,Mohsen Janmaleki,Morteza Teymoori 한국조직공학과 재생의학회 2017 조직공학과 재생의학 Vol.14 No.3

Recent investigations consider adipose-derived stemcells (ASCs) as a promising source of stemcells for clinical therapies. To obtain functional cells with enhanced cytoskeleton and aligned structure, mechanical stimuli are utilized during differentiation of stem cells to the target cells. Since function of muscle cells is associated with cytoskeleton, enhanced structure is especially essential for these cells when employed in tissue engineering. In this study by utilizing a custom-made device, effects of uniaxial tension (1Hz, 10% stretch) on cytoskeleton, cell alignment, cell elastic properties, and expression of smooth muscle cell (SMC) genes in ASCs are investigated.Due to proper availability ofASCs, results can be employed in cardiovascular engineeringwhen production of functional SMCs in arterial reconstruction is required. Results demonstrated that cells were oriented after 24 hours of cyclic stretch with aligned pseudo-podia. Staining of actin filaments confirmed enhanced polymerization and alignment of stress fibers. Such phenomenon resulted in stiffening of cell body which was quantified by atomic force microscopy (AFM). Expression of SM a-actin and SM22 aactin as SMC associated genes were increased after cyclic stretch while GAPDH was considered as internal control gene. Finally, it was concluded that application of cyclic stretch on ASCs assists differentiation to SMC and enhances functionality of cells.

Novel carbon nano-fibers (CNF)/polysulfone (PSf) mixed matrix membranes for gas separation

Mohsen Jahanshahi,Ahmad Rahimpour,Mohsen Jahanshahi,Ali Asghar Ghoreyshi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-

Mixedmatrixmembranes (MMM) included of carbon nanofibers (CNFs) fabricated and characterized forgas separation performance. For preparation of MMM, carbon nanofibers content was varied from 0.01 to1 wt% in polysulfone (PSf) casting solution. The fabricated CNFs/PSF MMMs characterized by scanningelectron microscopy (SEM), atomic force microscopy (AFM), ATR–FTIR spectra and pure gas permeationand sorption test. The gas transport properties ofMMMmeasured using single gas permeation set up (N2,O2, CO2, and CH4) at ambient temperature and different feed pressures. Additionally, sorption isothermsformixed matrixmembranesmade for CH4 and CO2. The sorption data were analyzed by the dual-modesorption model. Themorphological studies show that the incorporation of CNFs appreciably changed thesurface properties of membranes. The permeation test showed that the mixed matrix membraneexhibited high permeability. With increasing CNF concentration, CNFs/PSF membrane permeabilityraised from 2.134 to 12.04 Barrer for CO2. The results found that this unique membrane had increasedpermeability and enhanced selectivity. Also it has a great potential to be used practically in gasseparation technology.

Minimizing Sensing Decision Error in Cognitive Radio Networks using Evolutionary Algorithms

( Mohsen Akbari ),( Md. Kamal Hossain ),( Mohsen Riahi Manesh ),( Ayman A. El-saleh ),( Aymen M. Kareem ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.9

Cognitive radio (CR) is envisioned as a promising paradigm of exploiting intelligence for enhancing efficiency of underutilized spectrum bands. In CR, the main concern is to reliably sense the presence of primary users (PUs) to attain protection against harmful interference caused by potential spectrum access of secondary users (SUs). In this paper, evolutionary algorithms, namely, particle swarm optimization (PSO) and genetic algorithm (GA) are proposed to minimize the total sensing decision error at the common soft data fusion (SDF) centre of a structurally-centralized cognitive radio network (CRN). Using these techniques, evolutionary operations are invoked to optimize the weighting coefficients applied on the sensing measurement components received from multiple cooperative SUs. The proposed methods are compared with each other as well as with other conventional deterministic algorithms such as maximal ratio combining (MRC) and equal gain combining (EGC). Computer simulations confirm the superiority of the PSO-based scheme over the GA-based and other conventional MRC and EGC schemes in terms of detection performance. In addition, the PSO-based scheme also shows promising convergence performance as compared to the GA-based scheme. This makes PSO an adequate solution to meet real-time requirements.

Altering undigested neutral detergent fiber through additives applied in corn, whole barley crop, and alfalfa silages, and its effect on performance of lactating Holstein dairy cows

Seyed Mohsen Hosseini,Mohsen Danesh Mesgaran,Ali Reza Vakili,Abbas Ali Naserian,Ehsan Khafipour 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.3

Objective: We hypothesized that silage additives may alter the undigested neutral detergent fiber (uNDF) content through ensiling. Therefore, urea and formic acid were applied to corn, whole barley crop (WBC) and alfalfa to change uNDF content of the ensiled forages. Methods: Six experimental diets at two groups of high uNDF (untreated corn and alfalfa silages [CSAS] and untreated whole barley and alfalfa silages [BSAS]) and low uNDF (urea-treated corn silage+untreated alfalfa silage [CSUAS], urea-treated whole barley silage+untreated alfalfa silage [BSUAS], untreated corn silage+formic acid-treated alfalfa silage [CSASF], and untreated whole barley silage+formic acid-treated alfalfa silage [BSASF]), were allocated to thirty-six multiparous lactating Holstein dairy cows. Results: The untreated silages were higher in uNDF than additive treated silages, but the uNDF concentrations among silages were variable (corn silage<barley silage<alfalfa silage). Dry matter intake was not influenced by the reduction of uNDF or physical NDF supply source from corn to WBC silages (p>0.05). Milk yield tended to increase in the cows fed high uNDF diets than those fed low uNDF (p = 0.10). The cows fed diet based on urea-treated corn silage had higher milk yield than those fed other silages (p = 0.05). The substitution of corn silage with the WBC silage tended to decrease milk production (p = 0.07). Changing the physical source of NDF supply and the uNDF content from the corn silage to the WBC silage caused a significant increase in ruminal NH3-N concentration, milk urea-N and fat yield (p< 0.05). The cows fed diets based on WBC silage experienced greater rumination time than the cows fed corn silage (p<0.05). Conclusion: Administering additives to silages to reduce uNDF may improve the performance of Holstein dairy cows.

Adapting the performance and physico-chemical properties of PES nanofiltration membrane by using of magnesium oxide nanoparticles

Sayed Mohsen Hosseini,Ehsan Bagheripour,Mohsen Ansari 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6

A new mixed matrix Polyethersulfone (PES)-co-Magnesium oxide nanoparticles (MGO) nanocomposite nanofiltration membrane was prepared through phase inversion method by using polyvinylpyrrolidone (PVP) as pore former and N, N dimethylacetamide (DMAc) as solvent. The influence of MGO nanoparticles concentration in the membrane matrix on the separation performance and physico-chemical characteristics of prepared membrane was studied by scanning electron microscopy, surface analysis, porosity measurement, water contact angle, permeability flux, salt rejection, antifouling property, and tensile strength. SEM images exhibited situating of MGO nanoparticles on the top surface of mixed matrix prepared membranes. SEM analysis also showed formation of a dense nanoparticle layer on the surface of prepared membrane at high additive concentration. Surface analysis results that revealed membrane surface roughness was increased initially by addition of MGO and then was decreased. Measured porosity showed reduction behavior for all prepared membranes filled with MGO nanoparticles. The membrane surface hydrophilicity was enhanced 35% by incorporating MGO nanoparticles into the membrane matrix. Results showed that membrane permeation flux was improved 32% by utilizing of MgO nanoparticles into the membrane matrix. Salt rejection was also improved 49% by using MGO nanoparticles in the membrane matrix relatively. The modified membranes filled with different concentrations of MGO nanoparticles showed higher antifouling properties and tensile strength compared to the neat PES membrane.