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Search Results: 1 - 10 of 682 matches for " drissa Ly "
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Isoperimetric inequality for an interior free boundary problem with p-laplacian operator
drissa Ly,Diaraf Seck
Electronic Journal of Differential Equations , 2004,
Abstract: By considering the p-Laplacian operator, we establish an existence and regularity result for a shape optimization problem. From a monotony result, we show the existence of a solution to the interior problem with a free surface for a family of Bernoulli constants. We also give an optimal estimation for the upper bound of the Bernoulli constant.
Urinary Tract Infections Identified in the Preoperative and Their Sensitivities to Antibiotics  [PDF]
Amadou Kassogué, Fadima Tall, Daouda Diallo, Drissa Cissé, Zanafon Ouattara
Open Journal of Urology (OJU) , 2018, DOI: 10.4236/oju.2018.85018
Abstract: Introduction: Urinary tract infection is a public health problem. Patients who have to undergo urology surgery are exposed to infectious complications if there is an untreated urinary tract infection. The objective of our study is to identify all the germs responsible for urinary tract infections discovered in the preoperative assessment of hospitalized patients with their susceptibility and antibiotic resistance profiles. Patients and Methods: This is a retrospective and descriptive study of 124 cases of cytobacteriological examination of urine collected over 2 years from January 1st, 2016 to December 31st, 2017, performed in the urology department of the University Hospital of Bocar S. Sall of Kati. The parameters studied were: age, sex, reason for admission, the diagnosis chosen, the result of the cytobacteriological examination of urine and the antibiogram. Results: We collected 124 cases of cytobacteriological examination of urine during this period. The average age of our patients was 58 years old with extremes ranging from 3 years to 84 years. The sex ratio was 6 in favor of men. 86 patients, or 69%, were admitted for micturition disorders. In 53.2%, the diagnosis was BPH followed by urolithiasis 22.6%. Cytobacteriological examination of urine identified 55 cases of urinary infection, 44%. In 34 cases or 60%, the germ responsible was an E. coli. Two germs were sensitive only to one antibiotic. Conclusion: This study made it possible to have an idea about the antibiotic susceptibility of germs involved in urinary tract infections. Awareness-raising for the proper use of antibiotics needs to be strengthened to minimize the risk of increasing antibiotic resistance.
A First Principles Simulation Framework for the Interactions between a Si(001) Surface and a Scanning Probe  [PDF]
Dung Q. Ly, Charalampos Makatsoris
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2012, DOI: 10.4236/jsemat.2012.223030
Abstract: By means of total energy calculations within the framework of the local density approximation (LDA), the interactions between a silicon Si(001) surface and a scanning probe are investigated. The tip of the probe, comprising 4 Si atoms scans along the dimer lines above an asymmetric p(2 × 1) surface, at a distance where the chemical interaction between tip-surface is dominant and responsible for image resolution. At that distance, the tip causes the dimer to toggle when it scans above the lower atom of a dimer. The toggled dimers create an alternating pattern, where the immediately adjacent neighbours of a toggled dimer remain unchanged. After the tip has fully scanned across the p(2 × 1) surface, causes the dimers to arrange in a p(2 × 2) reconstruction, reproducing the images obtained in scanning probe experiments. Our modelling methodology includes simulations that reveal the energy input required to overcome the barrier to the onset of dimer toggling. The results show that the energy input to overcome this barrier is lower for the p(2 × 1) surface than that for the p(2 × 2) or c(4 × 2) surfaces.
Characterisation of Rapeseed Oil Based Resins Using Infrared and Thermogravimetry Techniques
LY Mwaikambo
Tanzania Journal of Science , 2011,
Abstract: Rapeseed oil which is a triglyceride had undergone chemical modification on its structure to obtain hydroxyl groups. The hydroxylated chemical structure was crosslinked using methylene-pphenyl diisocyanate to produce a thermoset rapeseed oil resin. The cross linking process was monitored in situ using the Attenuated Total Internal Reflectance Fourier Transform-Infrared spectroscopy and the thermogravimetric analysis techniques. The infrared technique was also used to monitor chemical groups of the unmodified rapeseed oil. A reduction of the absorption band around 3300 cm-1 which is due to the presence of hydroxyl groups was observed indicating the occurrence of the reaction between the hydroxylated rapeseed oil and methylene-p-phenyl diisocyanate. The thermogravimetric analysis technique recorded the reduction of the hydroxyl groups as the loss in mass of the reactants as a function of temperature. The two analytical techniques provided about the same cure time. Both, the infrared and thermogravimetric techniques elucidated useful cure characteristics of the rapeseed oil resin. The applications of more than one analytical method offer a complement of the results.
Telomere dynamics in induced pluripotent stem cells: Potentials for Human disease modeling
Hinh Ly
World Journal of Stem Cells , 2011, DOI: 10.4252/wjsc.v3.i10.89
Abstract: Recent advances in reprograming somatic cells from normal and diseased tissues into induced pluripotent stem cells (iPSCs) provide exciting possibilities for generating renewed tissues for disease modeling and therapy. However, questions remain on whether iPSCs still retain certain markers (e.g. aging) of the original somatic cells that could limit their replicative potential and utility. A reliable biological marker for measuring cellular aging is telomere length, which is maintained by a specialized form of cellular polymerase known as telomerase. Telomerase is composed of the cellular reverse transcriptase protein, the integral RNA component, and other cellular proteins (e.g. dyskerin). Mutations in any of these components of telomerase can lead to a severe form of marrow deficiency known as dyskeratosis congenita (DC). This review summarizes recent findings on the effect of cellular reprograming via iPS of normal or DC patient-derived tissues on telomerase function and consequently on telomere length maintenance. The potentials and challenges of using iPSCs in a clinical setting will also be discussed.
Appendix C: Focus Group Summary of the Cambodian Student Association
Darlene Ly
Journal of Southeast Asian American Education and Advancement , 2011,
Appendix D: Focus Group Summary of the Union of Vietnamese Student Assoications of Southern California
Phong Ly
Journal of Southeast Asian American Education and Advancement , 2011,
Book Review: Golden Bones: An Extraordinary Journey from Hell in Cambodia to a New Life in America, by Sichan Siv
Monirith Ly
Journal of Southeast Asian American Education and Advancement , 2012,
Représentations modulo $p$ de $\mathrm{GL}(m,D)$, $D$ algèbre à division sur un corps local
Tony Ly
Mathematics , 2014,
Abstract: This Ph.D. thesis belongs to the realm of mod $p$ representation theory of $p$-adic groups. The main object of study is the inner form of the general linear group $\mathrm{GL}(m,D)$ where $D$ is a division algebra over a non-Archimedean local field. The first part focuses on the rank $1$ case ($m=2$): it develops in detail the irreducibility criterion for parabolically induced representations and a classification of irreducible admissible smooth representations "\`a la Barthel-Livn\'e". Then one turns to the generalized Steinberg representations: building on ideas of Grosse-Kl\"onne and Herzig, this chapter manages to get a result that is valid for any reductive group over a non-Archimedean local field. Finally the last part exploits the two previous ones, and by overcoming some combinatorial difficulties that arise in the rank $>1$ case, one gets a classification "\`a la Herzig" for $\mathrm{GL}(3,D)$ and $\mathrm{GL}(m,D)$, $m>3$, with some technical assumptions on $D$.
Firing Rate Dynamics in Recurrent Spiking Neural Networks with Intrinsic and Network Heterogeneity
Cheng Ly
Quantitative Biology , 2015,
Abstract: Heterogeneity of neural attributes has recently gained a lot of attention and is increasing recognized as a crucial feature in neural processing. Despite its importance, this realistic physiological feature has traditionally been neglected in theoretical studies of cortical neural networks for various reasons. Thus, there is still a lot unknown about the consequences of cellular and circuit heterogeneity in spiking neural networks. In particular, combining network or synaptic heterogeneity and intrinsic heterogeneity has yet to be considered systematically despite the fact that both are known to exist and likely have significant roles in neural network dynamics. In a canonical recurrent spiking neural network model, we study how these two forms of heterogeneity lead to different distributions of excitatory firing rates. To analytically characterize how these types of heterogeneities affect the network, we employ a dimension reduction method that relies on a combination of Monte Carlo simulations and probability density function equations. We find that the relationship between intrinsic and network heterogeneity has a strong effect on the overall level of heterogeneity of the firing rates. Specifically, this relationship can lead to amplification or attenuation of firing rate heterogeneity, and these effects depend on whether the recurrent network is firing asynchronously or rhythmically firing. These observations are captured with the aforementioned reduction method, and furthermore simpler analytic descriptions based on this dimension reduction method are developed. The final analytic descriptions provide compact and descriptive formulas for how the relationship between intrinsic and network heterogeneity determines the firing rate heterogeneity dynamics in various settings.
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