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OALib Journal期刊

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Influence of Freezing and Freeze Drying on Intracellular Enzymatic Activity and Autolytic Properties of Some Lactic Acid Bacterial Strains  [PDF]
S. Kandil, M. El Soda
Advances in Microbiology (AiM) , 2015, DOI: 10.4236/aim.2015.56039
Abstract: Lactic acid bacteria possess several interesting properties of great economic importance. Improvement and stabilization of these industrially important features are an active research area at the present time. The objectives of this work are to study the effect of freezing and freeze-drying on the survival rate, autolytic activity and intracellular enzymatic activity of the main species of lactic acid bacteria used in the dairy industry. The article focused on several characteristics that were not well covered in the past. The obtained results revealed that both preservation methods have a significant effect on viability, autolytic activity and intracellular enzymatic activity. After six months of storage we found that frozen cultures exhibited higher survival rate, higher rate of intracellular enzymatic activity and lower rate of autolysis. The impact of conservation treatments was only strain specific in the case of survival rate. The results obtained lead to the selection of the best preservation method for the selected cultures based on survival rate, autolytic activity and intracellular enzymatic activity.
Does Demand Volatility Lower Growth and Raise Inflation? Evidence from the Caribbean
Kandil, Magda;
Economía mexicana. Nueva época , 2009,
Abstract: the paper investigates asymmetry in the allocation of aggregate demand shocks between real output growth and price inflation over the business cycle in a sample of fifteen caribbean countries. in most countries, the evidence indicates the existence of a kinked supply curve, which implies that positive demand shocks feed predominantly into prices while negative demand shocks mainly affect output. this suggests that the high variability of aggregate demand in caribbean countries, frequently exposed to shocks, tends to create an upward bias on inflation and a downward bias on real output growth, on average, over time. the analysis highlights the benefits of eliminating structural rigidities responsible for the kinked nature of the supply curve, and points to the dangers of pro-cyclical macroeconomic policies.
A revolta no Egito
Kandil, Hazem;
Novos Estudos - CEBRAP , 2011, DOI: 10.1590/S0101-33002011000300009
Abstract: this interview focuses on the fall of hosni mubarak's authoritarian regime in egypt: the reasons leading to the popular uprising, the social strata that engaged in it and its mobilization strategies, the forces that supported mubarak's regime and perspectives for the future of democracy in egypt.
Does Demand Volatility Lower Growth and Raise Inflation? Evidence from the Caribbean
Magda Kandil
Economía Mexicana , 2009,
Abstract: Este trabajo investiga la asimetría en la distribución de choques de demanda agregada entre el crecimiento real de la oferta y la inflación de precios durante el ciclo de negocios, en una muestra de quince países caribe os. En la mayoría de ellos, la evidencia indica la existencia de una curva de oferta con elasticidad discontinua, lo cual implica que los choques de demanda positivos alimentan predominantemente los precios, mientras que los choques de demanda negativos afectan principalmente la oferta. Esto sugiere que la alta variabilidad de la demanda agregada en países caribe os, expuesta frecuentemente a choques, tiende a crear, en promedio y a lo largo del tiempo, un sesgo hacia arriba en la inflación y un sesgo hacia abajo en el crecimiento verdadero de la oferta. Este análisis enfatiza los beneficios de eliminar las rigideces estructurales responsables de la discontinuidad de la elasticidad de la curva de oferta, y se ala los peligros de políticas macroeconómicas pro cíclicas.
Tethering of Homo and Block Glycopolymer Chains onto Montmorillonite Surface by Atom Transfer Radical Polymerization  [PDF]
Amal Amin, Heba Kandil, Ahmed Ramadan, Mohamed Nader Ismail
Open Journal of Organic Polymer Materials (OJOPM) , 2012, DOI: 10.4236/ojopm.2012.24012
Abstract: Well-defined homo glycopolymer/montmorillonite (MMT) nanocomposite (gly1) was prepared successfully by the “grafting from” technique from the modified surface of MMT via surface initiated atom transfer radical polymerization (SI-ATRP) of 3-O-methacryloyl-1,2:5,6-di-O-isopropylidene-α-D-glucofuranose (gly) in the presence of Cu(I)Br/ bi- pyridyl at 90?C in xylene. Well-defined diblock copolymers (gly2, gly3, gly4 and gly5) were also synthesized via the same technique by using comonomers of methylmethacrylate (MMA) or styrene (St) with glycomonomer (gly) using the same catalytic system. The formed nanocomposites showed both intercalated and exfoliated structures, as judged by XRD and TEM measurements. Further analyses were performed on such nanocomposites to confirm their formation such as TGA and DSC. The structures of the attached polymers to MMT were characterized by 1H NMR.
Experimental Investigation of Progressive Collapse of Steel Frames  [PDF]
Kamel Sayed Kandil, Ehab Abd El Fattah Ellobody, Hanady Eldehemy
World Journal of Engineering and Technology (WJET) , 2013, DOI: 10.4236/wjet.2013.13006
Abstract: This paper reports two new tests conducted to augment available data highlighting the structural performance of multistory steel frames under progressive collapse. The investigated steel frames had different geometries, different boundary conditions, different collapse mechanisms, different damping ratios and different connections. Overall, the paper addresses how multistory frames would behave when subjected to local damage or loss of a main structural carrying element. The obtained results can form a data base for nonlinear finite element models. The deformations of the investigated steel frames and failure modes under progressive collapse were predicted from the finite element analysis, with detailed discussions presented.
Progressive Collapse of Steel Frames  [PDF]
Kamel Sayed Kandil, Ehab Abd El Fattah Ellobody, Hanady Eldehemy
World Journal of Engineering and Technology (WJET) , 2013, DOI: 10.4236/wjet.2013.13007
Abstract:

This paper investigates the behavior of steel frames under progressive collapse using the finite element method. Non-linear finite element models have been developed and verified against existing data reported in the literature as well as against tests conducted by the authors. The nonlinear material properties of steel and nonlinear geometry were considered in the finite element models. The validated models were used to perform extensive parametric studies investigating different parameters affecting the behavior of steel frames under progressive collapse. The investigated parameters are comprised of different geometries, different number of stories and different dynamic conditions. The force redistribution and failure modes were evaluated from the finite element analyses, with detailed discussions presented.

Investigation of the Performance of CIS Photovoltaic Modules under Different Environmental Conditions  [PDF]
Kandil M. Kandil, Majida S. Altouq, Asma M. Al-asaad, Latifa M. Alshamari, Ibrahim M. Kadad, Adel A. Ghoneim
Smart Grid and Renewable Energy (SGRE) , 2011, DOI: 10.4236/sgre.2011.24043
Abstract: This work investigates the effects of temperature and radiation intensity on the parameters of a copper indium diselenide (CIS) photovoltaic module. The module performance parameters are determined from calculated module parameters. An outdoor experimental setup is installed to carryout a series of I-V curve measurements under different irradiance and temperature conditions for the module. A numerical model which considers the effect of series and shunt resistances is developed to evaluate the different parameters of PV modules. Orthogonal distance regression (ODR) algorithm is adapted for fitting I-V measurements and extracting module parameters from I-V measurements. The values of module parameters, series resistance Rs, shunt resistance Rsh, diode ideality factor n and reverse saturation current Io determined from I-V measurements at different irradiation intensity and temperature range are in good agreement with the corresponding parameters obtained from the developed numerical model. The module parameters extracted from I-V measurements are employed to calculate the module performance parameters, i.e. open circuit voltage Voc, fill factor FF and module efficiency η at different irradiation intensity and temperature range. Present results indicate that the largest drop in open circuit voltage Voc due to about 20℃ increase in temperature is approximately 8.8% which is not compensated for by the relatively small increase in short circuit current, (2.9% in Isc), resulting in a reduction in maximum power of about 6.3%. Results let us conclude that the shunt resistance RSh increases with radiation at low radiation values (< 400 W/m2). As radiation increases at high radiation values (> 400 W/m2), RSh begins to decease sharply and dramatically. Also, as the light intensity incident on the solar module increases, the series resistance and the output voltage decrease. When the irradiance intensity increases, the series resistance decreases but with a very low rate at the two studied temperatures ranges. The low rate decrease of Rs is found to have little effect on module performance in comparison with the significant change of other module parameters. The ideality factor n and saturation current Io decrease first sharply in the low range of radiation intensity (<400 W/m2) and this decrease becomes
Spatio-Temporal Interpolation Is Accomplished by Binocular Form and Motion Mechanisms
Farid I. Kandil, Markus Lappe
PLOS ONE , 2007, DOI: 10.1371/journal.pone.0000264
Abstract: Spatio-temporal interpolation describes the ability of the visual system to perceive shapes as whole figures (Gestalts), even if they are moving behind narrow apertures, so that only thin slices of them meet the eye at any given point in time. The interpolation process requires registration of the form slices, as well as perception of the shape's global motion, in order to reassemble the slices in the correct order. The commonly proposed mechanism is a spatio-temporal motion detector with a receptive field, for which spatial distance and temporal delays are interchangeable, and which has generally been regarded as monocular. Here we investigate separately the nature of the motion and the form detection involved in spatio-temporal interpolation, using dichoptic masking and interocular presentation tasks. The results clearly demonstrate that the associated mechanisms for both motion and form are binocular rather than monocular. Hence, we question the traditional view according to which spatio-temporal interpolation is achieved by monocular first-order motion-energy detectors in favour of models featuring binocular motion and form detection.
Prosthetic valve endocarditis caused by Pasteurella in a penicillin allergic patient: challenges in diagnosis and treatment
Giovanni Satta,Rebecca Louise Gorton,Hala Kandil
Infectious Disease Reports , 2012, DOI: 10.4081/idr.2012.e32
Abstract: Pasteurella multocida is a rare cause of infective endocarditis with only a few cases described. This report involves a 38-year-old penicillin-allergic patient in an immunocompromised state with several co-morbidities. Two molecular microbiological techniques, 16S rRNA sequencing and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry were used to confirm the species identification as P. multocida. Previous reports in the literature are also reviewed.
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