Anomalous Reaction-Sub-diffusion equations play an important role transferred in a lot of our dai... more Anomalous Reaction-Sub-diffusion equations play an important role transferred in a lot of our daily applications in our life, especially in applied chemistry. In the presented work, a modified type of these models is considered which is the Reaction-Sub-diffusion equation of variable order, the linear and nonlinear models and we will refer to it by VORSDE. An accurate technique depends on a mix of the finite difference methods (FDM) together with Hermite formula is introduced to study these important types of anomalous equations. Regarding the analysis of the stability for the mentioned, it is done using the variable Von-Neumann technique; also the convergent analysis is introduced. As a result of the previous steps, we derived a stability condition which will be held for many discretization schemes of the variable order derivative and some other parameters and we checked it numerically.
The variant Boussinesq equation has significant application in propagating long waves on the surf... more The variant Boussinesq equation has significant application in propagating long waves on the surface of the liquid layer under gravity action. In this article, the improved Bernoulli subequation function (IBSEF) method and the new auxiliary equation (NAE) technique are introduced to establish general solutions, some fundamental soliton solutions accessible in the literature, and some archetypal solitary wave solutions that are extracted from the broad-ranging solution to the variant Boussinesq wave equation. The established soliton solutions are knowledgeable and obtained as a combination of hyperbolic, exponential, rational, and trigonometric functions, and the physical significance of the attained solutions is speculated for the definite values of the included parameters by depicting the 3D profiles and interpreting the physical incidents. The wave profile represents different types of waves associated with the free parameters that are related to the wave number and velocity of th...
International Journal of Electrical and Computer Engineering (IJECE), 2022
In this paper, the field analysis of the sleeve rotor induction motor (IM) is carried out taking ... more In this paper, the field analysis of the sleeve rotor induction motor (IM) is carried out taking the rotor ends into consideration. Here, the field system equations are derived using the cylindrical model with applying Maxwell's field equations. It is expected that, both starting and maximum torques will increase with taking the rotor ends than that without rotor ends. A simple model is used to establish the geometry of the rotor ends current density and to investigate the air gap flux density. The magnetic flux is assumed to remain radially constant through the very small air gap length between the sleeve and stator surfaces. Variation of the field in the radial direction is ignored and the skin effect in the axial direction is considered. The axial distributions of the air gap flux density, the sleeve current density components and the force density have been determined. The motor performance is carried out taking into account the effects of the rotor ends on the starting and ...
HIV elite controllers maintain a population of CD4 + T cells endowed with high avidity for Gag an... more HIV elite controllers maintain a population of CD4 + T cells endowed with high avidity for Gag antigens and potent effector functions. How these HIV-specific cells avoid infection and depletion upon encounter with the virus remains incompletely understood. Ex vivo characterization of single Gag-specific CD4 + T cells reveals an advanced Th1 differentiation pattern in controllers, except for the CCR5 marker, which is downregulated compared to specific cells of treated patients. Accordingly, controller specific CD4 + T cells show decreased susceptibility to CCR5-dependent HIV entry. Two controllers carried biallelic mutations impairing CCR5 surface expression, indicating that in rare cases CCR5 downregulation can have a direct genetic cause. Increased expression of β-chemokine ligands upon high-avidity antigen/TCR interactions contributes to autocrine CCR5 downregulation in controllers without CCR5 mutations. These findings suggest that genetic and functional regulation of the primary...
In this paper, a novel framework of reliability centered maintenance (RCM) is proposed. The objec... more In this paper, a novel framework of reliability centered maintenance (RCM) is proposed. The objective of this RCM model is to overcome the shortcomings of the existing RCM models. Current RCM models neither propose any actions with non-critical equipment nor propose any maintenance metrics. Moreover, they do not present maintenance work order flow. Both the classical and streamlined RCM models are adopted to formulate the proposed model to be more effective and efficient, i.e. it is focusing on the main functions of the system for the sake of preventing or eliminating the maintenance actions that are not necessary and identify effective maintenance tasks. In addition, a general Excel-based algorithm is proposed to perform criticality analysis and classification of machines/equipment into different categories. The proposed framework of RCM has been applied and evaluated in a real case study; namely is Fayoum Sugar Works Company in Egypt which produces Sugar. The results of applying R...
International Journal of Power Electronics and Drive Systems (IJPEDS), 2021
This paper presents an analytical comparison between two-level inverter and three-level neutral p... more This paper presents an analytical comparison between two-level inverter and three-level neutral point diode clamped inverters for electric vehicle traction purposes. The main objective of the research is to declare the main differences in the performance of the two inverter schemes in terms of the switching and conduction losses over an entire domain of the modulation index and the phase angle distribution, steady-state operation, transient operation at a wide range of speed variation, and the total harmonic distortion THD% of the line voltage output waveform. It also declares the analysis of the three-level neutral point diode clamped inverter (NPCI) obstacle and the unbalance of the DC-link capacitor voltages. The introduced scheme presents an Induction Motor (IM) drive for electric vehicle (EV) applications. Considering the dynamic operation of the EV, the speed of the three-phase induction motor is controlled using a scalar V/Hz control for the full range of the IM power factor ...
Bulletin of Egyptian Society for Physiological Sciences, 2020
Hydrogen sulfide has been recently studied as a potential treatment for many cardiovascular disor... more Hydrogen sulfide has been recently studied as a potential treatment for many cardiovascular disorders. Here, we describe its role in I/R-induced cardiac hypertrophy and arrhythmia model. Thirty six male Sprague Dawley rats were used in this study. Rats were randomly divided into 6 groups, G 1(n = 6/group): control negative: received saline, G2, I/R rats, (I/R, n = 6), after right nephrectomy, the rats were subjected to left kidney ischemia for 45 minutes followed by reperfusion:,G3, I/R rats in which rats were treated by NaHS, the donor of H 2 S (5 mg/kg/day×14 days) intraperitoneal,G4, I/R rats in which rats were treated by the blocker of H 2 S aminooxyacetic acid (10 mg/kg/day×14 days) intraperitoneal,G5, I/R rats in which rats were treated by converting enzyme inhibitor (Captopril) (50 mg/Kg/day ×14 days) and, G6, I/R rats in which rats were treated by NaHS and K ATP channel blocker (Glibenclamide) (20 mg/kg/day ×14 days). NaHS led to a highly significant decrease in the duration of ventricular action potential indicated by QTc. Furthermore, it decreased, significantly, both of mean blood pressure and plasma renin activity. Moreover, H 2 S donor and converting enzyme inhibition increased the expression of CX-43. While (I/R + NaHS + K ATP channel block) led to a non-significant decreased in the duration of QTc interval. This showed that hydrogen sulfide generation has a potential therapeutic role in IR-induced cardiac hypertrophy and arrhythmia via amelioration of CX-43 expression and opening of K ATP channels. Keywords • Hydrogen sulfide • Cardiac hypertrophy • K ATP channels Bull. of Egyp. Soc. Physiol. Sci.
Bulletin of Egyptian Society for Physiological Sciences, 2018
Background: Cadmium (Cd) is widespread used in industry and extensively disseminated in the envir... more Background: Cadmium (Cd) is widespread used in industry and extensively disseminated in the environment. As a result of the extensive use of cadmium (Cd) in industry and its extensive dissemination in the environment, numerous studies have focused on the identification of the early stages of Cd-induced renal injury in exposed persons. Following long-term low-level exposure, nearly one-third of the cadmium in the body will be found in the renal tissue. So, the aim of the present work is to evaluate the disturbed renal functions induced by cadmium exposure and its underlying mechanism. Materials and Methods: Twenty male rats were divided into two main groups, ten rats per each group. Group 1 (n=10) was the Cd group in which rats were treated for 13 days with a daily dose of 1 mg CdCl2/kg body weight in sterile 0.9 % NaCl solution subcutaneously. Group2 (n=10) was the vehicle control, they received equivalent volumes of sterile 0.9 % NaCl solution by subcutaneous injections. Results: cadmium administration led to a decrease in serum sodium and potassium level and increase their level in urine. It led to a significant decrease in creatinine clearance and a significant increase in the oxidative stress biomarker tissue malondialdehyde (MDA), as well as, and a significant decrease in serum total antioxidant capacity. Moreover, cadmium led to a significant decrease in glucose uptake by kidney (mg/gm wet tissue/h.) Conclusion: Cd has detrimental effects on kidney functions and renal handling of glucose and this effect is referred to its oxidative stress effect. Keywords Cadmium Kidney Oxidative stress Rats Bull. of Egyp. Soc. Physiol. Sci.
Objectives To examine the relationship between mandibular volume and craniofacial morphology in p... more Objectives To examine the relationship between mandibular volume and craniofacial morphology in patients with cleft lip and palate using cone beam computed tomography (CBCT) and to compare these findings with control (noncleft) patients undergoing CBCT for other purposes during the deciduous dentition period. Materials and Methods Eighty-four patients were categorized into the unilateral cleft lip and alveolus (UCLA) group (n = 25; mean age, 4.60 ± 0.40 years), unilateral cleft lip and palate (UCLP) group (n = 23; mean age, 4.52 ± 0.39 years), bilateral cleft lip and palate (BCLP) group (n = 22; mean age, 4.54 ± 0.37 years), and control group without cleft (n = 14; mean age, 5.19 ± 0.52 years). Mandibular volume and craniofacial cephalometric measurements were obtained using CBCT. All measurements were assessed by analysis of covariance (ANCOVA) using Bonferroni post hoc pairwise comparison tests. Results ANCOVA revealed no statistically significant differences in mandibular volume ...
Introduction. Postoperative acute kidney injury is associated with a higher mortality, a more com... more Introduction. Postoperative acute kidney injury is associated with a higher mortality, a more complicated hospital course with longer hospital stay. Urinary kidney injury molecule 1 may play an important role as an early predictor of acute kidney injury post-cardiopulmonary in open heart surgery. Methods. We evaluated 45 patients who underwent open heart surgery from January 2016 to June 2016. Both urinary kidney injury molecule 1 and serum creatinine were evaluated before operation and 3hs and 24hs after operation. Acute kidney injury was diagnosed according to Kidney Disease: Improving Global Outcomes, 2012 guidelines. Results. In this study, 27 patients developed acute kidney injury. The three hour-post-surgery urinary kidney injury molecule 1 was significantly higher in the acute kidney injury group (P<0.015) and, at the same time, we did not find any significant difference in the serum creatinine levels between the two groups. Conclusion. Although serum creatinine is still t...
The Showa University Journal of Medical Sciences, 2017
A signi cant genetic component is involved in the development of the craniofacial form. Recently,... more A signi cant genetic component is involved in the development of the craniofacial form. Recently, the growth hormone receptor gene GHR variants rs6180 and rs6184 were associated with variations in mandibular form. To con rm these ndings we evaluated the relationship between these GHR variants and mandibular form in a cohort of Egyptian individuals with a normal skull form. The patients consisted of 191 unrelated Egyptian adults 92 males, 99 females ; 18-55 years. Allele frequencies of the rs6180 and rs6184 variants were determined from genomic DNA extracted from saliva using the Taqman genotyping assay. Lateral and posteroanterior cephalometric tracings were used to obtain 19 mandibular measurements. The association between the GHR variants and the mandibular measurements was examined using regression analysis. The frequency of the minor rs6184 variant was very low at 1.5 : therefore, association studies were not performed for this variant. The rs6180 variant was not associated with any of the measurements representing mandibular form in our study cohort. The frequency of the rs6184 variant was very low in our cohort of Egyptian subjects. We also found no association between the rs6180 variant and the measurements representing the mandibular form. By excluding the involvement of these GHR variants in in uencing mandibular form, our results may help to identify the actual variant s affecting the mandibular form in the Egyptian population.
FGFR1 plays an important role in the development of the nervous system as well as the regulation ... more FGFR1 plays an important role in the development of the nervous system as well as the regulation of the skeletal development and bone homeostasis. Mutations in FGFR1 genes affect skull development, specifically suture and synchondrosis, resulting in craniosynostosis and facial abnormalities. We examined subjects with normal skull morphology for genetic polymorphisms that might be associated with normal craniofacial variations. Genomic DNA was obtained from 216 Japanese and 227 Korean subjects. Four FGFR1 SNPs, namely, rs881301, rs6996321, rs4647905, and rs13317, were genotyped. These SNPs were tested for association with craniofacial measurements obtained from lateral and posteroanterior cephalometries, in which principle component analysis was performed to compress the data of the craniofacial measurements. We observed that SNPs rs13317 and rs6996321 were correlated with the overall head size and midfacial development, indicating that FGFR1 SNPs played crucial roles in the normal v...
International Journal of Computer Applications, 2016
Spyware is somewhat of a silent killer, because its essential task is secretly and quietly monito... more Spyware is somewhat of a silent killer, because its essential task is secretly and quietly monitoring or sending victim's sensitive information to a separate third party. Unfortunately, existing anti-spyware systems lack the ability to cope with the rapid changes in the spyware signatures and programs.
similar, and there was a tendency toward dental protrusion in the Egyptian groups [11]. Hassan ev... more similar, and there was a tendency toward dental protrusion in the Egyptian groups [11]. Hassan evaluated the cephalometric features of a Saudi population living in the western area of Saudi Arabia and revealed distinct cephalometric features in the Saudis [12]. In their studies on Anatolian Turkish adults who are considered part of the Mediterranean population, Basciftci et al. established cephalometric norms for Turkish men and women and studied the sex differences in this population. They found that the Anatolian Turkish have a long lower anterior facial height with retroclined upper incisors and proclined lower incisors [13]. The Moroccan population, which is a North African population, was examined by Ousehal et al. who established cephalometric norms based on Steiner's analysis, and their results indicated a more retruded mandible and maxilla with large skeletal sagittal discrepancies [14]. Aboul-Azm et al. established craniofacial and soft tissue standards for the Egyptian population. Twenty-two angular measurements, 13 linear measurements, and three ratios were established for the most significant skeletal, dental, and soft-tissue parameters [15]. The aim of the present study was to identify the cephalometric norms in an adult Egyptian population and compare the values of Egyptian males
To investigate the relationship between anteroposterior and vertical differences in maxillofaci... more To investigate the relationship between anteroposterior and vertical differences in maxillofacial morphology and mandibular volume. Subjects comprised 213 Japanese adults (84 males and 129 females) who were divided into three groups based on mandibular basal arch (ANB) and Wits, measured in a cephalometric analysis: Class I (-1° ≤ ANB < 4°,-1 mm ≤ Wits < 0 mm), Class II (ANB ≥ 4°, Wits ≥ 0), and Class III (ANB <-1°, Wits <-1 mm). Subjects were also divided into three groups based on the mandibular plane angle (Mp), as follows: hypodivergent (Mp < 23°), normodivergent (Mp = 23-30°), and hyperdivergent (Mp > 30°) groups. Mandibular volume was measured from cone-beam computed tomographic images that were analyzed using Analyze™ image processing software and compared among the three groups in each classification. No significant differences were noted in mandibular volume among Classes I, II, and III. An inverse relationship was found between mandibular volume a...
To compare the rates of catheter-associated bloodstream infection (CABSI) in preterm infants born... more To compare the rates of catheter-associated bloodstream infection (CABSI) in preterm infants born at <30 weeks' gestation who received a peripherally inserted central catheter (PICC) versus an umbilical venous catheter (UVC) immediately after birth as their primary venous access. This retrospective matched cohort study examined data from infants born at <30…
We describe a testing framework that can provide online estimates of audio and video call quality... more We describe a testing framework that can provide online estimates of audio and video call quality on network paths, without requiring either end-user involvement or prior availability of audio/video sequences or network traces. The framework includes a tool that emulates the audio and video traffic of IP calls and employs an extended E-Model to measure the audio quality and VQM to estimate video quality. Additionally, it can emulate network impairments to run experiments in different network conditions. Our experiment results show that the quality measurements acquired using the framework compare well to the most commonly applied industry standard for objective voice and video offline testing—PESQ and PSNR respectively.
Maintaining good Quality-of-Experience (QoE) is crucial for Voice-over-IP (VoIP) applications, pa... more Maintaining good Quality-of-Experience (QoE) is crucial for Voice-over-IP (VoIP) applications, particularly those operating across the public Internet. Accurate online estimation of QoE as perceived by end users allows VoIP applications take steps to improve QoE when it falls below acceptable levels. ITU-T recommendation G.107 introduced the E-model, which provides a means to assess QoE levels for two-party VoIP sessions. In this paper we provide an analysis of the accuracy of the E-model for multi-party VoIP sessions when all audio is processed by a centralised focus node. We analyse the impact of what we term the "Focus Transcoding Effect (FTE)," the "Focus Forwarding Effect (FFE)," and the number of end-points participating in the session. Through comparison to QoE metrics produced by the offline PESQ method for three common audio codecs, we show that the standard E-model does not provide accurate QoE assessment for multi-party VoIP sessions. We then introduce an improved Emodel for these codecs for multi-party VoIP sessions. We describe the implementation of the improved E-model in a QoE monitoring application, showing that it produces results similar to actual PESQ scores.
We present and evaluate an algorithm that performs in-call selection of the most appropriate audi... more We present and evaluate an algorithm that performs in-call selection of the most appropriate audio codec given prevailing conditions on the network path between the endpoints of a voice call. We have studied the behaviour of different codecs under varying network conditions, in doing so deriving the impairment factors for non-ITU-T codecs so that the E-model can be used to assess voice call quality for them. Moreover, we have studied the drawbacks of codec switching from the end user perception point of view; our switching algorithm seeks to minimise this impact. We have tested our algorithm on different packages that contain a selection of the most commonly used codecs: G.711, SILK, ILBC, GSM and SPEEX. Our results show that in many typical network scenarios, our switching codecs mid-call algorithm results in better Quality of Experience (QoE) than would have been achieved had the initial codec been used throughout the call.
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Papers by Mohamed Adel