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Acute hepatitis C:Prospects and challenges

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World Journal of Gastroenterology 2007年第48期13卷 6455-6457页

作者： Sanaa m Kamal Department of Gastroenterology and Liver Diseases Ain Shams University

more than 170 million people worldwide have chronic hepatitis C. Acute hepatitis C is rarely diagnosed because it is commonly asymptomatic. most infected patients are unaware of their condition until the symptoms of chronic infection manifest. Treatment of acute hepatitis C is something of a paradox because spontaneous resolution is possible and many patients do not have symptoms. However, several factors provide a rationale for treating patients who have acute hepatitis C. Compared with acute hepatitis C, chronic hepatitis C is associated with a worse prognosis, the need for more intensive treatment, longer treatment duration, and a decrease in successful treatment outcomes. Conversely, early intervention is associated with improved viral eradication, using a regimen that is better tolerated, less expensive, more convenient, and of shorter duration than the currently approved combination therapies for chronic hepatitis C.

关键词： Acute hepatitis C Therapy Pegylated interferon

Effect of additives on nickel-phosphorus deposition obtained by electroless plating:Characterization and corrosion resistance in 3%(mass)sodium chloride medium

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Chinese Journal of Chemical Engineering 2022年第4期35卷 341-350页

作者： N.m'hanni T.Anik R.Touir m.Galai m.Ebn Touhami E.H.Rifi Z.Asfari S.Bakkali Advanced materials and Process Engineering Laboratory Faculty of SciencesIbn Tofail UniversityBP 13314000 KenitraMorocco Regional Center for Education and Training Professions(CRmEF) KenitraMorocco Laboratory of molecular Engineering Applied to the Analysis IPHCUMR 7178 CNRSUniversity of StrasbourgECPM25 Street Becquerel67087 Strasbourg Cedex 2France Laboratoire de Chimie Analytique et moléculaire/LCAm UniversitéCadi AyyadFacultéPolydisciplinaireSidi BouzidB.P.416246000 SafiMorocco

Nichel-phosphorus(Ni-P)coatings are deposited on mild steel by using an electroless plating *** effect of three calix[4]arene derivatives,namely tetra methyl ester-P-tertbutyl calix[4]arene(Calix1),tetra acid-P-tert-butyl calix[4]arene(Calix2)and tetra methyl P-tert-butyl-thicalix[4]arene ester(Calix3)on the deposition rate,the deposit composition,and the morphological surface was investigated and the study of growth mechanisms has delivered useful information about the surface properties of *** is found that these additives modify the deposition rate and the nickel crystallization *** fact,the Calix1 and Calix3 act as an accelerator,while Calix2 acts as an inhibitor for the nickel ***,it is shown that the chemical bath is more stable with calix[4]arene derivatives addition and the obtained deposits are compact and *** is observed also that the nickel content increases with *** the other hand,the X-ray diffraction showed that the orientation peaks are intensified at{111}in the presence of Calix2,confirming obtained results of EDAX *** cyclic voltammetry revealed that the tested additives strongly influence the cathodic process and slightly affect the hypophosphite ***,it is found that these compounds improve the anticorrosion efficiency of Ni-P coating on the mild steel substrate in 3%(mass)NaCl,where its polarization resistance increases with Calix2 and Calix3 addition.

关键词： Electroless plating Ni-P coating Organic compounds Characterization Corrosion Reaction kinetics

Ultra-thin Bloch-surface-wave-based reflector at telecommunication wavelength

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Photonics Research 2017年第5期5卷 494-499页

作者： R. DUBEY B. VOSOUGHI LAHIJANI m. HAYRINEN m. ROUSSEY m. KUITTINEN H. P. HERZIG Optics & Photonics Technology Laboratory (OPT) ecole Polytechnique Federale de Lausanne (EPFL) rue de la Maladiere 71b Institute of Photonics University of Eastern Finland

We experimentally demonstrate the optical properties of gratings engraved in a single-mode waveguide fabricated on top of a dielectric multilayer platform. The structure can be approached as a reflector for Bloch-surface-wavebased two-dimensional optical systems. The gratings have been fabricated on a thin(～λ∕25) titanium dioxide layer with a thickness of a few tens of nanometers deposited on the top of a multilayer platform. The optical properties of the gratings have been characterized in the near field with the aid of multi-heterodyne scanning nearfield optical microscopy. We investigate the surface wave's interference pattern, produced by incident and reflected light in front of the gratings. The presented gratings behave as an efficient Bloch-surface–wave-basedreflector at telecommunication wavelength.

关键词： reflector Bloch waveguide multilayer behave grating Bragg dielectric titanium fabrication

Stability analysis solutions of the nonlinear modified Degasperis-Procesi water wave equation

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Journal of Ocean Engineering and Science 2017年第3期2卷 155-160页

作者： m.A.Helal Aly R.Seadawy m.Zekry mathematics Department Faculty of ScienceCairo UniversityGizaEgypt mathematics Department Faculty of ScienceTaibah UniversityAl-UlaSaudi Arabia mathematics Department Faculty of ScienceBeni-Suef UniversityEgypt

In the present study,the solitary wave solutions of modified Degasperis-Procesi equation are *** the standard Degasperis-Procesi equation,where multi-peakon solutions arise,the modification caused a change in the characteristic of these peakon solutions and changed it to bell-shaped *** using the extended auxiliary equation method,we deduced some new soliton solutions of the fourthorder nonlinear modified Degasperis-Procesi equation with constant *** solutions include symmetrical,non-symmetrical kink solutions,solitary pattern solutions,weiestrass elliptic function solutions and triangular function *** discuss the stability analysis for these solutions.

关键词： modified Degasperis-Procesi water wave equation Extended auxiliary equation method Solitary wave solutions

GIS-based irrigation water management for precision farming of rice

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International Journal of Agricultural and Biological Engineering 2010年第3期3卷 27-35页

作者： Rowshon m K Amin m S m Department of Biological and Agricultural Engineering Faculty of EngineeringUniversiti Putra Malaysia43400 UPM Sri SerdangSelangor DEMalaysia

Precision farming aims to manage production inputs over many small management zones rather than on large *** is difficult to manage inputs at extremely fine scales,especially in the case of the rice irrigation ***,site-specific irrigation management can potentially improve the overall water management in comparison to irrigated areas of hundreds of hectares.A critical element of the irrigation scheduling and management is the accurate estimation of irrigation supplies and its proper allocation for the irrigation offtake structures based on the actual planted *** irrigation scheduling procedures consist of monitoring indicators that determine the need for *** final decision depends on the irrigation criterion,strategy and *** scheduling is the decision of when and how much water to apply to a *** amount of water applied is determined by using a criterion to determine irrigation need and a strategy to prescribe how much water to apply in any *** right amount of daily irrigation supply and monitoring at the right time within the discrete irrigation unit is essential to improve the irrigation water management of a *** paper presents the GIS capability to achieve the goal in the view of irrigation strategy and goal with special reference to precision farming of *** GIS-based water management model was developed for the scheduling daily irrigation water deliveries and regular monitoring of irrigation delivery ***“Scheduling”program computes the right amount of irrigation deliveries based on crop water ***“monitoring”program gives information on the uniformity of water distribution and the shortfall or *** displayed results allow the manager to view maps,tables and graphs in a comprehensible form to ease decision making that where the irrigation amount will be delivered as the season *** was used as a useful tool to assist the irrigation water management pro

关键词： irrigation monitoring precision farming rice GIS

Feasibility of implementation of intelligent simulation configurations based on data mining methodologies for prediction of tractor wheel slip

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Information Processing in Agriculture 2019年第2期6卷 183-199页

作者： S.m.Shafaei m.Loghavi S.Kamgar Department of Biosystems Engineering School of AgricultureShiraz UniversityShiraz 71441-65186Iran

This paper deals with implementation of intelligent simulation configurations for prediction of tractor wheel slip in tillage *** effects of numeral variables of forward speed(2,4,and 6 km/h)and plowing depth(10,20,and 30 cm),and nominal variable of tractor driving mode(two-wheel drive(2WD)and four-wheel drive(4WD))on tractor rear wheel slip were intelligently simulated utilizing data mining methodologies of artificial neural network(ANN)and adaptive neuro-fuzzy inference system(ANFIS).Neuro-fuzzy potential of the ANFIS simulation framework against neural ability of the ANN simulation framework was *** confirmed higher efficiency of the best configuration of the ANFIS simulation framework with satisfactory statistical performance criteria of coefficient of determination(0.981),root mean square error(1.124%),mean absolute percentage error(1.515%),and mean of absolute values of prediction residual errors(1.135%)than that of the ANN simulation *** perception obtained from the ANFIS simulation results demonstrated that the wheel slip increased nonlinearly with increment of forward speed and plowing depth,while it decreased as tractor driving mode changed from the 2WD to ***,the best configuration of the ANFIS based intelligent simulation framework implemented in this study can be used for further relevant studies of tractor rear wheel slip as a reference.

关键词： Forward speed Plowing depth Tractor driving mode Tillage operations Tractor tractive efficiency

Solution of a problem of thermal stresses in a non-homogeneous thermoelastic infinite medium of isotropic material by finite difference method

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Journal of Ocean Engineering and Science 2019年第3期4卷 256-262页

作者： A.m.Farhan A.m.Abd-Alla moaiad A.Khder Physics Department Faculty of ScienceJazan UniversitySaudi Arabia Physics Department Faculty of ScienceZagzig UniversityEgypt mathematics Department Faculty of ScienceSohag UniversityEgypt Department of Computer Science Applied Science UniversityBahrain

The present work deals with a new problem of thermoelasticity for an infinitely long and isotropic circular cylinder of temperature dependent physical *** inner and outer curved surfaces of the cylinder are subjected to both the mechanical and thermal boundary conditions.A finite difference model is developed to derive the solution of the problem in which the governing equations are uncoupled linear partial differential *** transient solution at any time can be evaluated directly from the *** order to demonstrate the efficiency of the present model we consider a suitable material and obtain the numerical solution of displacement,temperature,and stresses inside the cylinder for the homogeneous-dependent material properties of the *** results are analyzed with the help of different graphical plots.

关键词： Thermal stress Thermoelasticity Wave propagation Finite difference method Non-homogeneous medium

Spectral collocation method for solving continuous population models for single and interacting species by means of exponential Chebyshev approximation

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International Journal of Biomathematics 2018年第8期11卷 265-288页

作者： m. A. Ramadan m. A. Abd El Salam mathematics Department Faculty of Science Menoufia University Shebin El-KomEgypt mathematics Department Faculty of Science Al-Azhar University Nasr-City Cairo Egypt

In this paper, an efficient and accurate method is presented to solve continuous population models for single and interacting species using spectral collocation method with exponential Chebyshev (EC) functions. The first problem is a logistic growth model in a population, while the second problem is a prey-predator model: Lotka-Volterra system, the tbird is a simple 2-species Lotka-Volterra competition model, and the final one is a prey-predator model with limit cycle periodic behavior. The high accuracy of this method is verified through some numerical examples. The obtained numerical results are compared with other methods, showing that the proposed method gives higher accuracy.

关键词： Exponential Chebyshev functions continuous population models spectral collocation method

Correlation between microstructure and wear behavior of AZX915 mg-alloy reinforced with 12 wt%TiC particles by stir-casting process

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Journal of magnesium and Alloys 2016年第4期4卷 306-313页

作者： Nagaraj m.Chelliah Harpreet Singh m.K.Surappa Department of mechanical Engineering Indian Institute of Technology RoparRupnagar 140001PunjabIndia Department of materials Engineering Indian Institute of ScienceBengaluru 560012KarnatakaIndia

The present work concerns with correlation between microstructure and wear behavior of AZX915 mg-alloy reinforced with 12 wt%of TiC particles by stir-casting *** sliding tests were performed under ambient environment by using a pin-on-disc(EN8 steel)configuration with a normal load of 50 N at a constant sliding speed of 2.50 ms^(−1).While as-cast composite experienced delamination wear,heat treated composite suffered from delamination and oxidation wear during dry sliding ***,the heat treated composite exhibited lower friction and higher wear rate as compared to the as-cast *** and wear behavior were correlated with microstructures based on the concept of oxidation tendency and crack nucleation/***,a schematic model has been proposed illustrating wear mechanisms from the point of view of subsurface microstructural evolution of the AZX915-TiCp composite.

关键词： mg-alloys magnesium matrix composites Heat treatment Delamination Tribo-oxidation