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Comparison between three fixed anaesthesia protocols in rabbits
Abdellatif Boudra,Idir Benbelkacem,Rachid Merati,Hamza Achour,Ilyes Djelloul Daouadji 한국예방수의학회 2020 예방수의학회지 Vol.44 No.3
In veterinary medicine, anaesthesia is fundamental for many medical acts, as complementary tests or surgical procedures. This discipline has evolved enormously in recent years, both in terms of practices as well as in terms of materials and used molecules.The aim of the present study was to compare three anaesthetic protocols, using injectable anaesthesia Ketamine/xylazine/acepromazine, ketamine/xylazine, and ketamine/xylazine /meloxicam in rabbits. Nine adult males, Neo-Zealand breed rabbits, weighing between 2.5 and 3.5 Kg were randomly divided into three groups, housed indoor to accommodate the place of experiments to evaluate their effects on risk factors associated with peri-anaesthetic mortality, along with gastrointestinal complications, in order to establish a suitable anaesthetic protocol, coupled with continuous monitoring of the anaesthetized animal. The association of acepromazine, xylazine, and ketamine, which give a deep myorelaxation and remarkable analgesia, obtained the anaesthesia. Fixed products do not lead to any myorelaxation of the mandibular muscles. The addition of a non-steroidal anti-inflammatory drug increased the effect of the peri-anaesthetic analgesia. The protocol using acepromazine, xylazine, and ketamine is the best schema for the potentiated general anaesthesia in rabbit, because of its insignificant effect on the intestinal motility.
Applicability of steady state model to carrier thermodynamics in InAs quantum dot.
Abdellatif, M H,Kopylov, O S,Song, Jin Dong,Choi, Won Jun,Cho, Nam Ki,Lee, Jungil American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.1
<P>The carrier thermodynamics of InAs self assembled quantum dot (QD) are investigated. The investigated parameters include the dependence of quantum dot photoluminescence on temperature and the photoluminescence (PL) dependence on the excitation power density. Results are discussed on the basis of steady state model. The model predicts that the photoluminescence integrated intensity has linear dependence on the excitation power density in low temperature range, and super linear in the high temperature range. Our data matches the prediction of the steady state model. In our sample the super linearity starts to take place at T = 150 K and the super linear behavior of the photoluminescence on excitation power density proves that the carrier dynamics in our quantum dot sample are dominated by uncorrelated electron hole pair in the high temperature region.</P>
Evidence of correlated electron hole pairs in dots in asymmetric quantum well structures
Abdellatif, M H,Song, Jin Dong,Choi, Won Jun,Cho, Nam Ki,Lee, Jung Il Institute of Physics 2010 Journal of Physics: Conference Series Vol.245 No.1
<P>We introduce the study of InAs quantum dots embedded in an InGaAs quantum well. The quantum dot potential strongly modifies the energy states of the quantum well structure. Hence, the carrier thermodynamics is also influenced. The dependence of the integrated photoluminescence on the excitation power density shows linear dependence with very little deviation from linearity at a high temperature. That result contributes to the strong correlation between the electron and hole pairs, which is attributed to the enhanced confinement provided by the asymmetric quantum well structure.</P>
NAD+ and Vascular Dysfunction: From Mechanisms to Therapeutic Opportunities
Abdellatif Mahmoud,Heiko Bugger,Guido Kroemer,Simon Sedej 한국지질동맥경화학회 2022 지질·동맥경화학회지 Vol.11 No.2
Nicotinamide adenine dinucleotide (NAD+) is an essential and pleiotropic coenzyme involved not only in cellular energy metabolism, but also in cell signaling, epigenetic regulation, and post-translational protein modifications. Vascular disease risk factors are associated with aberrant NAD+ metabolism. Conversely, the therapeutic increase of NAD+ levels through the administration of NAD+ precursors or inhibitors of NAD+-consuming enzymes reduces chronic low-grade inflammation, reactivates autophagy and mitochondrial biogenesis, and enhances oxidative metabolism in vascular cells of humans and rodents with vascular pathologies. As such, NAD+ has emerged as a potential target for combatting age-related cardiovascular and cerebrovascular disorders. This review discusses NAD+-regulated mechanisms critical for vascular health and summarizes new advances in NAD+ research directly related to vascular aging and disease, including hypertension, atherosclerosis, coronary artery disease, and aortic aneurysms. Finally, we enumerate challenges and opportunities for NAD+ repletion therapy while anticipating the future of this exciting research field, which will have a major impact on vascular medicine.
New chaotic map development and its application in encrypted color image
Abdellatif JarJar 한국멀티미디어학회 2021 The journal of multimedia information system Vol.8 No.2
This paper traces the process of constructing a new one-dimensional chaotic map, and will provide a simple application in color image encryption. The use of Sarkovskii’s theorem will make it possible to determine the existence of chaos and restrict all conditions to ensure the existence of this new sequence. In addition, the sensitivity to initial conditions will be proved by Lyapunov's index value. Similarly, the performance of this new chaotic map will be illustrated graphically and compared with other chaotic maps most commonly used in cryptography. Finally, a humble color image encryption application will show the power of this new chaotic map.
Analysis of In/Ga Inter-Diffusion Effect on the Thermodynamical Properties of InAs Quantum Dot
Abdellatif, M.H.,Song, Jin Dong,Lee, Donghan,Jang, Yudong The Korean Vacuum Society 2016 Applied Science and Convergence Technology Vol.25 No.6
Debye temperature is an important thermodynamical factor in quantum dots (QDs); it can be used to determine the degree of homogeneity of a QD structure as well as to study the interdiffusion mechanism during growth. Direct estimation of the Debye temperature can be obtained using the Varshni relation. The Varshni relation is an empirical formula that can interpret the change of emission energy with temperature as a result of phonon interaction. On the other hand, phonons energy can be calculated using the Fan Expression. The Fan expression and Varshni relation are considered equivalent at a temperature higher than Debye temperature for InAs quantum dot. We investigated InAs quantum dot optically, the photoluminescence spectra and peak position dependency on temperature has been discussed. We applied a mathematical treatment using Fan expression, and the Varshni relation to obtain the Debye temperature and the phonon energy for InAs quantum dots sample. Debye temperature increase about double compared to bulk crystal. We concluded that the In/Ga interdiffusion during growth played a major role in altering the quantum dot thermodynamical parameters.
Abdellatif Ben Makhlouf,Mohamed Ali Hammami 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.6
In this paper, we point out that inequality (7) of [5] is not correct. A feasible modified and corrected version of the main result is presented. Furthermore, some numerical examples are given to illustrate the applicability of the modified result.
Dynamic behavior of cracked ceramic reinforced aluminum composite beam
Abdellatif Selmi 국제구조공학회 2022 Smart Structures and Systems, An International Jou Vol.29 No.3
This paper presents the vibration analysis of cracked ceramic-reinforced aluminum composite beams by using a method based on changes in modal strain energy. The crack is considered to be straight. The effective properties of composite materials of the beams are estimated through Mori-Tanaka micromechanical model. Comparison study and numerical simulations with various parameters; ceramic volume fraction, reinforcement aspect ratio, ratio of the reinforcement Young's modulus to the matrix Young's modulus and ratio of the reinforcement density to the matrix density are taken into investigation. Results demonstrate the pronounced effects of these parameters on intact and cracked ceramic aluminum beams.
Exact solution for nonlinear vibration of clamped-clamped functionally graded buckled beam
Abdellatif Selmi 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.26 No.3
Exact solution for nonlinear behavior of clamped-clamped functionally graded (FG) buckled beams is presented. The effective material properties are considered to vary along the thickness direction according to exponential-law form. The in-plane inertia and damping are neglected, and hence the governing equations are reduced to a single nonlinear fourth-order partial-integraldifferential equation. The von Karman geometric nonlinearity has been considered in the formulation. Galerkin procedure is used to obtain a second order nonlinear ordinary equation with quadratic and cubic nonlinear terms. Based on the mode of the corresponding linear problem, which readily satisfy the boundary conditions, the frequencies for the nonlinear problem are obtained using the Jacobi elliptic functions. The effects of various parameters such as the Young's modulus ratio, the beam slenderness ratio, the vibration amplitude and the magnitude of axial load on the nonlinear behavior are examined.