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A BEm/FEm Coupling Approach for Fluid-structure Interaction simulation of Cell motion

Communications in Computational Physics 2010年第5期7卷 994-1026页

作者： s.Y.Wang P.Q.Chen K.m.Lim B.C.Khoo singapore-mIT Alliance E4-04-104 Engineering Drive 3Singapore 117576 Department of mechanical Engineering National University of SingaporeSingapore 119260

In this paper, accurate and efficient simulation of cell motion in a biological fluid flow is investigated. The membrane of a moving cell is represented by athin shell composed of incompressible neo-Hookean elastic materials and the liquidsaround the membrane are approximated as incompressible Newtonian flows with lowReynolds numbers. The biofluid mechanics is approximated by the stokes flow equations. A low-order BEm model is developed for the two biological fluids coupled atthe membrane surface. The moving boundary problem in fluid mechanics can be effectively solved using the BEm with a GmREs solver. The FEm model based on a flatthin shell element is further developed to predict the membrane load due to the largedeformation of a moving cell. Computational efficiency is greatly improved due tothe one-dimensional reduction in the present BEm and FEm models. The BEm solverfor the biological fluids is coupled with the FEm solver for the cell membrane at themembrane surface. The position of the membrane surface nodes is advanced in time byusing the classical fourth-order Runge-Kutta method. Numerical instability is avoidedby using a relatively small time step. Further numerical instabilities in the FEm solveris alleviated by using various techniques. The present method is applied to the FsIproblems of cell motion in a cylindrical flow. Numerical examples can illustrate thedistinct accuracy, efficiency and robustness of the present method. Furthermore, theimportance of bending stiffness of a cell membrane for stable cell motion simulation isemphasized. It is suggested that the present approach be an appealing alternative forsimulating the fluid-structure interaction of moving cells.

关键词： Fluid-structure interaction coupling approach boundary element method finite element method stability thin shell element

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Application of constructed wetlands for wastewater treatment in tropical and subtropical regions(2000–2013)

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Journal of Environmental sciences 2015年第4期27卷 30-46页

作者： Dong-Qing Zhang K.B.s.N.Jinadasa Richard m.Gersberg Yu Liu soon Keat Tan Wun Jern Ng Advanced Environmental Biotechnology Centre Nanyang Environment & Water Research Institute Nanyang Technological University Department of Civil Engineering University of Peradeniya Graduate school of Public Health San Diego State University

Constructed wetlands（CWs） have been successfully used for treating various wastewaters for decades and have been identified as a sustainable wastewater management option for developing countries. With the goal of promoting sustainable engineered systems that support human well-being but are also compatible with sustaining natural（environmental）systems, the application of CWs has become more relevant. such application is especially significant for developing countries with tropical climates, which are very conducive to higher biological activity and productivity, resulting in higher treatment efficiencies compared to those in temperate climates. This paper therefore highlights the practice,applications, and research of treatment wetlands under tropical and subtropical conditions since 2000. In the present review, removal of biochemical oxygen demand（BOD） and total suspended solid（Tss） was shown to be very efficient and consistent across all types of treatment wetlands. Hybrid systems appeared more efficient in the removal of total suspended solid（Tss）（91.3%）, chemical oxygen demand（COD）（84.3%）, and nitrogen（i.e.,80.7% for ammonium（NH）4-N, 80.8% for nitrate（NO）3-N, and 75.4% for total nitrogen（TN））as compared to other wetland systems. Vertical subsurface flow（VssF） CWs removed Tss（84.9%）, BOD（87.6%）, and nitrogen（i.e., 66.2% for NH4-N, 73.3% for NO3-N, and 53.3% for TN）more efficiently than horizontal subsurface flow（HssF） CWs, while HssF CWs（69.8%）showed better total phosphorus（TP） removal compared to VssF CWs（60.1%）. Floating treatment wetlands（FTWs） showed comparable removal efficiencies for BOD（70.7%）,NH4-N（63.6%）, and TP（44.8%） to free water surface（FWs） CW systems.

关键词： Constructed wetlands Treatment Nutrient Removal Tropical

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A Review on Diverse silver Nanostructures

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Journal of materials science & Technology 2010年第6期26卷 487-522页

作者： s.Vongehr National Laboratory of solid state microstructures Department of Materials Science and EngineeringNanjing University

This article reviews recent advances in the utilization of various water based synthesis routes towards the shape-controlled synthesis of silver nanoparticles and microstructures in a diverse range of shapes and sizes from several nanometers to micrometers. A variety of very simple one-pot methods, at times employing com- mercial microwave ovens, inexpensive low power ultrasound cleaners, or two-electrode electro-chemistry, can be surprisingly effective in the controlled synthesis of a wide range of nanostructured products, if only parameters are carefully chosen. many approaches which are adopted include synthesis of Ag nanostructures with various shapes in solution, doping of Ag nanoparticles on unmodified silica and on/inside carbon spheres, kinetically controlled growth of Ag micro-particles with novel nanostructures on flat substrates, and galvanic replace- ment towards bimetallic Ag-Au dendrites and carbon composites. Characterizations of shape, composition and microstructure are carried out via scanning and transmission electron microscopy, various spectroscopy methods, N2 absorption measurements and suchlike. The involved growth mechanisms are investigated in order to discover new means towards better control. size, location and shape control, including micro- and nanostructure features, allows tuning the products properties towards desired applications. We focus on the optical properties and catalytic activities, but also the stability of compounds can be an issue of interest.

关键词： silver Nanostructures synthesis Thermal stability surface plasmon resonance Catalysis

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Effect of Bohm quantum potential in the propagation of ion–acoustic waves in degenerate plasmas

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Chinese Physics B 2016年第10期25卷 222-229页

作者： m m Hasan m A Hossen A Rafat A A mamun Department of Physics Jahangirnagar University

A theoretical investigation has been carried out on the propagation of the ion–acoustic(IA) waves in a relativistic degenerate plasma containing relativistic degenerate electron and positron fluids in the presence of inertial non-relativistic light ion fluid. The Korteweg-de Vries(K-dV), modified K-dV(m K-dV), and mixed m K-dV(mm K-dV) equations are derived by adopting the reductive perturbation method. In order to analyze the basic features(phase speed, amplitude, width,etc.) of the IA solitary waves(sWs), the sWs solutions of the K-dV, m K-dV, and mm K-d V are numerically analyzed. It is found that the degenerate pressure, inclusion of the new phenomena like the Fermi temperatures and quantum mechanical effects(arising due to the quantum diffraction) of both electrons and positrons, number densities, etc., of the plasma species remarkably change the basic characteristics of the IA sWs which are found to be formed either with positive or negative potential. The implication of our results in explaining different nonlinear phenomena in astrophysical compact objects, e.g.,white dwarfs, neutron stars, etc., and laboratory plasmas like intense laser–solid matter interaction experiments, etc., are mentioned.

关键词： Bohm quantum potential degenerate relativistic plasma electron and positron quantum effect

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Growth and characterization of ZnO multipods on functional surfaces with different sizes and shapes of Ag particles

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Chinese Physics B 2013年第8期22卷 683-689页

作者： A Kamalianfar s A Halim mahmoud Godarz Naseri m Navasery Fasih Ud Din J A m Zahedi Kasra Behzad K P Lim A Lavari monghadam s K Chen Department of Physics Faculty of Science University Putra Malaysia43400 UPM Serdang Selangor Malaysia Department of Physics Farhangian UniversityIran Institute for mathematical Research University Putra Malaysia43400 UPM Serdang Selangor Malaysia Department of Physics Faculty of Science Malayer UniversityMalayer Iran Department of Physics Karaj Branch Islamic Azad UniversityKaraj Iran Department of Physics Science Faculty Shahr-e-Ghods Branch Islamic Azad UniversityTehran Iran

Three-dimensional ZnO multipods are successfully synthesized on functional substrates using the vapor transport method in a quartz tube. The functional surfaces, which include two different distributions of Ag nanoparticles and a layer of commercial Ag nanowires, are coated onto silicon substrates before the growth of ZnO nanostructures. The structures and morphologies of the ZnO/Ag heterostructures are investigated using X-ray diffraction and field emission scanning electron microscopy. The sizes and shapes of the Ag particles affect the growth rates and initial nucleations of the ZnO structures, resulting in different numbers and shapes of multipods. They also influence the orientation and growth quality of the rods. The optical properties are studied by photoluminescence, UV-vis, and Raman spectroscopy. The results indicate that the surface plasmon resonance strongly depends on the sizes and shapes of the Ag particles.

关键词： ZnO ZnO-Ag surface plasmon resonance

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Juxta-caval hepatic angiomyolipoma masquerading as hepatocellular carcinoma

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Hepatobiliary & Pancreatic Diseases International 2003年第4期2卷 617-621页

作者： Alan m Hawxby michael Torbenson Elliot Fishman Leo Lawler Luis m Arrazola Andrew s Klein the Departments of surgery The Johns Hopkins Hospital Baltimore MD 21287 USA Pathology The Johns Hopkins Hospital Baltimore MD 21287 USA Radiology The Johns Hopkins Hospital Baltimore MD 21287 USA the Departments of surgery The Johns Hopkins Hospital Baltimore MD 21287 USA

Hepatic angiomyolipoma is an uncommon primary benign epithelial liver neoplasm. most patients with angiomyolipomas are middle-aged women who commonly present with epigastric fullness or pain. Angiomyolipomas are tumors consisting of three tissue types: blood vessels, smooth muscle, and fat. Hepatic angiomyolipomas may be difficult to differentiate from other liver neoplasms by noninvasive imaging. We report a 58-year-old asymptomatic woman with a mass in the right lobe of the liver, found incidentally on routine abdominal sonography. Preoperative radiographic evaluation revealed a 6.5-cm hypervascular lesion abutting the inferior vena cava. Preoperative histologic study demonstrated an epithelial neoplasm suspicious for hepatocellular carcinoma. metastatic workup was negative. At resection, the tumor was found to be an angiomyolipoma composed of lipoid, vascular and smooth muscle cells. Further staining was positive for HmB-45. Resection margins were negative. The woman had an uneventful recovery and was discharged on postoperative day seven. she currently remains well several months after her right hepatectomy.

关键词： angiomyolipoma hepatectomy radiographic evaluation multiplanar imaging

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Correlation Between Coastal Geomorphology and Tsunami Inundation Along the Coast of Kanyakumari,India

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Journal of Ocean University of China 2012年第1期11卷 1-6页

作者： N.Chandrasekar s.saravanan m.Rajamanickam C.Hentry G.V.Rajamanickam Centre for GeoTechnology Manonmaniam Sundaranar UniversityTirunelveliIndia Department of Disaster management SASTRA UniversityThanjavurIndia

An investigation has been carried out in the vicinity of the coastal villages of Kanyakumari District,India to decode the influence of coastal geomorphology on inundation degree and run-up *** though the tsunami waves approach the study area in different patterns,the consequences are found to be mainly dependent upon the coastal configuration and local geographic setting,the study area are considered to be of three types based upon the geomorphic arrangement,namely shallow coast,elevated coast and estuarine *** inundation and run-up level vary from coast to coast even though there is no remarkable variation in the intensity of the approaching tsunami *** inundation extent ranges from to 54 m to 413 m with maximum along estuarine coast and minimum along elevated *** coast recorded the maximum run-up level of about 6 m and the minimum of about 1 m along the elevated *** percentage of inundated area in the total coastal area varies between 19% to 10% along estuarine coast and elevated coast *** and run-up level cannot be appreciable in the inland along the elevated *** beaches of elevated coast are less affected whereas those of estuarine coast are highly *** is limited in the elevated beaches along the study area.

关键词： tsunami India coast geomorphology inundation

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In depth fusion flame spreading with a deuterium-tritium plane fuel density profile for plasma block ignition

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Chinese Physics B 2012年第12期21卷 317-321页

作者： B.malekynia s.s.Razavipour Department of Physics Gachsaran BranchIslamic Azad University

solid-state fuel ignition was given by Chu and Bobin according to the hydrodynamic theory at x = 0 qualitatively. A high threshold energy flux density, i.e., E＊ = 4.3 × 10^12 J/m2, has been reached. Recently, fast ignition by employing clean petawatt-picosecond laser pulses was performed. The anomalous phenomena were observed to be based on suppression of prepulses. The accelerated plasma block was used to ignite deuterium tritium fuel at solid-state density. The detailed analysis of the thermonuclear wave propagation was investigated. Also the fusion conditions at x ≠ 0 layers were clarified by exactly solving hydrodynamic equations for plasma block ignition. In this paper, the applied physical mechanisms are determined for nonlinear force laser driven plasma blocks, thermonuclear reaction, heat transfer, electro,ion equilibration, stopping power of alpha particles, bremsstrahlung, expansion, density dependence, and fluid dynamics. New ignition conditions may be obtained by using temperature equations, including the density profile that is obtained by the continuity equation and expansion velocity. The density is only a function of x and independent of time. The ignition energy flux density, Et＊, for the x ≠ 0 layers is 1.95 × 1012 J/m2. Thus threshold ignition energy in comparison with that at x =0 layers would be reduced to less than 50 percent.

关键词： plasma block solid-state fuel ignition expansion

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Laryngopharyngeal reflux and Helicobacter pylori

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World Journal of Gastroenterology 2014年第27期20卷 8964-8970页

作者： Taner Yllmaz münir Demir Bajin Rlza nder Günayd?n serdar zer Tevfik szen Department of Otolaryngology Head and Neck surgery Hacettepe University Hospital

Laryngopharyngeal reflux(LPR) occurs when gastric contents pass the upper esophageal sphincter, causing symptoms such as hoarseness, sore throat, coughing, excess throat mucus, and globus. The pattern of reflux is different in LPR and gastroesophageal reflux. LPR usually occurs during the daytime in the upright position whereas gastroesophageal reflux disease more often occurs in the supine position at night-time or during sleep. Ambulatory 24-h double pH-probe monitoring is the gold standard diagnostic tool for LPR. Acid suppression with proton pump inhibitor on a long-term basis is the mainstay of treatment. Helicobacter pylori(H. pylori) is found in many sites including laryngeal mucosa and interarytenoid region. In this paper, we aim to present the relationship between LPR and H. pylori and review the current literature.

关键词： Laryngophrayngeal reflux Helicobacter pylori Gastroesophageal reflux disease Proton pump inhibitors

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Hydrogen production by catalytic decomposition of methane using a Fe-based catalyst in a fluidized bed reactor

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Journal of Natural Gas Chemistry 2012年第4期21卷 367-373页

作者： D.Torres s.deLlobet J.L.Pinilla m.J.Lzaro I.suelves R.moliner Instituto de Carboquímica CSICMiguel Luesma Castn 450018 ZaragozaSpain

Catalytic decomposition of methane using a Fe-based catalyst for hydrogen production has been studied in this work. A Fe/Al2O3 catalyst previously developed by our research group has been tested in a fluidized bed reactor （FBR）. A parametric study ot the effects of some process variables, including reaction temperature and space velocity, is undertaken. The operating conditions strongly affect the catalyst performance. methane conversion was increased by increasing the temperature and lowering the space velocity. Using temperatures between 700 and 900℃ and space velocities between 3 and 6 LN/（gcat·h）, a methane conversion in the range of 25%-40% for the gas exiting the reactor could be obtained during a 6 h run. In addition, carbon was deposited in the form of nanofilaments （chain like nanofibers and multiwall nanotubes） with similar properties to those obtained in a fixed bed reactor.

关键词： hydrogen production fluidized bed reactor metal catalysts

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