Incorporating electronics in the architecture track of computer science, a comparative study

The latest draft report of the ACM/IEEE Joint Task Force on computer science makes several recommendations. Of these, for computer architecture: a) a shift towards more use of Programmable Logic Devices (PLDs), and b) more emphasis on the study of power constraints. While the shift towards use of PLDs requires minimal electrical knowledge, the study of power constraints requires better understanding of the electrical topics. With further constraints placed on the number of credit hours, detailed study the electrical topics may be skipped. The contribution of the paper is to propose a set of electrical topics compiled so as to include under curricula constraints and offer pedagogy of teaching the topics. In addition, the paper presents a comparative study of the electronics topics found in digital design texts.Facultad de Informátic

Incorporating electronics in the architecture track of computer science, a comparative study

The latest draft report of the ACM/IEEE Joint Task Force on computer science makes several recommendations. Of these, for computer architecture: a) a shift towards more use of Programmable Logic Devices (PLDs), and b) more emphasis on the study of power constraints. While the shift towards use of PLDs requires minimal electrical knowledge, the study of power constraints requires better understanding of the electrical topics. With further constraints placed on the number of credit hours, detailed study the electrical topics may be skipped. The contribution of the paper is to propose a set of electrical topics compiled so as to include under curricula constraints and offer pedagogy of teaching the topics. In addition, the paper presents a comparative study of the electronics topics found in digital design texts.Facultad de Informátic

Accelerated Lattice Boltzmann Method For Colloidal Suspensions Rheology And Interface Morphology

ABSTRACT ACCELERATED LATTICE BOLTZMANN MODEL FOR COLLOIDAL SUSPENSIONS RHEOLOGY AND INTERFACE MORPHOLOGY by HASSAN FARHAT July 2010 Advisor: Dr. Singh Trilochan Co-Advisor: Dr. Joon Sang Lee Major: Mechanical Engineering Degree: Doctor of Philosophy Colloids are ubiquitous in the food, medical, cosmetic, polymer, water purification and pharmaceutical industries. Colloids thermal, mechanical and storage properties are highly dependent on their interface morphology and their rheological behavior. Numerical methods provide a cheap and reliable virtual laboratory for the study of colloids. However efficiency is a major concern to address when using numerical methods for practical applications. This work introduces the main building-blocks for an improved lattice Boltzmann-based numerical tool geared towards the study of colloidal rheology and interface morphology. The efficiency of the proposed model is enhanced by using recently developed and validated migrating multi-block algorithms for the lattice Boltzmann method (LBM).The migrating multi-block was used to simulate single component, multi-component, multiphase and single component multiphase flows. Results were validated by experimental, numerical and analytical solutions. The contamination of the fluid-fluid interface influences the colloids morphology. This issue was addressed by the introduction of the hybrid LBM for surfactant-covered droplets. The module was used for the simulation of surfactant-covered droplet deformation under shear and uniaxial extensional flows respectively and under buoyancy. Validation with experimental and theoretical results was provided. Colloids are non-Newtonian fluids which exhibit rich rheological behavior. The suppression of coalescence module is the part of the proposed model which facilitates the study of colloids rheology. The model results for the relative viscosity were in agreement with some analytical results. Biological suspensions such as blood are micro-colloids by nature. The study of the blood flow in the microvasculature was heuristically approached by assuming the red blood cells as surfactant covered droplets. The effects of interfacial tension on the flow velocity and the droplet exclusion from the walls in parabolic flows were in qualitative agreement with some experimental and numerical results. The Fahraeus and the Fahraeus-Lindqvist effects were reproduced. The proposed modules could be used separately or in combination for the study of a variety of colloids and biological suspensions problems as this was demonstrated throughout this work

ACC-deaminase and/or nitrogen-fixing rhizobacteria and growth response of tomato (Lycopersicon pimpinellfolium Mill.)

The study aimed to identify and select important plant growth-promoting rhizobacteria (PGPR) and examine the response of tomato growth upon inoculation. Inoculation with rhizobacterial isolates increased all the measured physical, chemical, and enzymatic growth parameters compared to control. However, the TAN1 isolate had the highest effect, and significantly (P < 0.05) increased the root length (8.25-fold), root fresh (8.36-fold) and dry (12.6-fold) weight, shoot length (6.92-fold), shoot fresh (7.18-fold) and dry (6.90-fold) weight, number of leaves (11.0-fold), chlorophyll a (6.25-fold), chlorophyll b (10.7-fold), carotenoid contents (8.80-fold), seedlings fresh (9.0-fold) and dry (8.71-fold) weight, plant macronutrient uptake, i.e. N (7.7- and 8.9-fold), P (10.5- and 11.4-fold), K (7.8- and 8.8-fold), Ca (12.7- and 8.2-fold), and Mg (12.6- and 9-fold) in shoot and root, plant micronutrient uptake, i.e. Zn (6.6-, 10.2-), Cu (9.3-, and 10.3-fold), Fe (7.7- and 10.7-fold), and Mn (4.7- and 5.7-fold) in shoot and root and plant antioxidant enzymes, i.e. glutathione S-transferase (10.7-fold), peroxidase (8.1-fold), and catalase (10.5-fold). Our results concluded that inoculation of agricultural crops with rhizobacteria is a very useful approach to increase the plant growth. The rhizobacteria having both 1-aminocyclopropane-1-carboxylate (ACC) deaminase and nitrogen-fixing activity are more effective than rhizobacteria possessing either ACC-deaminase or nitrogen-fixing activity alone for growth promotion of crops

Incorporating electronics in the architecture track of computer science, a comparative study

The latest draft report of the ACM/IEEE Joint Task Force on computer science makes several recommendations. Of these, for computer architecture: a) a shift towards more use of Programmable Logic Devices (PLDs), and b) more emphasis on the study of power constraints. While the shift towards use of PLDs requires minimal electrical knowledge, the study of power constraints requires better understanding of the electrical topics. With further constraints placed on the number of credit hours, detailed study the electrical topics may be skipped. The contribution of the paper is to propose a set of electrical topics compiled so as to include under curricula constraints and offer pedagogy of teaching the topics. In addition, the paper presents a comparative study of the electronics topics found in digital design texts.Facultad de Informátic

Congenital agenesis of internal carotid artery with ipsilateral Horner presenting as focal neurological symptoms

Internal carotid artery (ICA) agenesis is a rare developmental anomaly and is most frequently asymptomatic, but it may also present as cerebrovascular accidents. The association with Horner’s syndrome is exceptional. We present three cases of agenesis of ICA associated with Horner’s syndrome and hypochromia iridum presenting as focal neurological symptoms. A system of collaterals develops as a consequence of agenesis of the ICA, making the majority of cases asymptomatic. Three types of collateral circulations have been described. These collaterals increase the risk of aneurysm formation and the occurrence of life-threatening subarachnoid hemorrhages. The association of congenital Horner’s syndrome and hypochromia iridum without anhidrosis is highly suggestive of sympathetic pathway injury early in life. Such signs should prompt further diagnostic evaluation to demonstrate the presence of the agenesis of the carotid canal. Early diagnosis is essential to rule out potentially life-threatening associated vascular anomalies

Indirect power control of DFIG based on wind turbine operating in MPPT using backstepping approach

This paper describes a MPPT control of the stator powers of a DFIG operating within a wind energy system using the backstepping control technique. The objective of this work consists of providing a robust control to the rotor-side converter allowing the stator active power to be regulated at the maximum power extracted from the wind turbine, as well as maintaining the stator reactive power at zero to maintain the power factor at unity, under various conditions. We have used the Matlab/Simulink platform to model the wind system based on a 7.5 kW DFIG and to implement the MPPT control algorithm in a first step, then we have implemented the field-oriented control and the backstepping controller in a second step. The simulation results obtained were very satisfactory with a fast transient response and neglected power ripples. They furthermore confirmed the high robustness of the approach used in dealing with the variation of the internal parameters of the machine

Metabolic Syndrome in Adults with Nonalcoholic Fatty Liver Disease

Nonalcoholic fatty liver disease (NAFLD) is associated with insulin resistance, obesity, and other features of metabolic syndrome. It is identified as the most common cause of liver enzyme derangement. Lately, NAFLD has generated interest in exploring treatment options, including weight loss and dietary interventions. An association of NAFLD with metabolic syndrome has been suggested in contemporary literature. In this study, we attempted to look into the association of NAFLD with metabolic syndrome. In this study, 80 adult NAFLD patients were recruited from a tertiary care hospital. Among these, 42 were males and 38 females with a mean age of 44.46±13.146 years (range 18–82 years). Grades of fatty liver and presence or absence of metabolic syndrome were studied in this patient population. Patients who did not qualify for the criteria of metabolic syndrome were placed in Group 1 and those who fulfilled the stated criteria were considered in Group 2. There were 29 (36.25%) patients in Group 1 and 51 (63.75%) in Group 2. All the patients in Group 1 were having Grade I fatty liver whereas patients in Group 2 were found to having varying grades of fatty liver, with six patients having Grade III fatty liver. We found statistically significant difference in various parameters of study (liver enzymes, high-density lipoprotein (HDL), triglycerides, and blood pressure) between Group 1 and Group 2. Ultrasound evidence of a fatty liver should be considered as a predictor of metabolic syndrome, and these patients must be investigated for the different components of metabolic syndrome so as to have early diagnosis and intervention to alter development of long-term metabolic disorders and their inherent complications