Design and implementation of PSO/ABC tunned PID controller for Buck converters

In the recent years, Buck converters have been widely involved in a variety of the everyday applications such as smartphones and PCs. Buck converters can provide better and steadier performance when integrating a control system in the design. Therefore, it is interesting to work on this integration and gain the required efficiency in term of the gained voltage. In this paper, PID controller is adopted to control the output voltage of the Buck converter. An optimization is achieved on the performance of the Buck converter using two bio-inspired algorithms namely, Particle Swarm Optimization (PSO) and Artificial Bee Colony (ABC). The voltage controlled Buck converter system is simulated using MATLAB environment to validate the proposed PID controller system. In this study, the voltage regulation process of Buck converter is investigated based on many working disturbances such as the change in the supply voltage, reference voltage, and load resistance in order to verify the robustness of the proposed PID controller. Finally, the feedabck voltage control system of the Buck converter is implemented experimentaly in real-time to validatde the simulated PID controller

Utilizing Satellite Based Observations and Physical Hydrological Modeling for Freshwater Ecosystem Health in the Lower Mekong River Basin

Freshwater availability is necessary to promote economic growth through agriculture, fisheries, transport, environmental health, and social equity.The National Aeronautics and Space Administration (NASA) and the Conservation International (CI) are partnering to use remote sensing Earth observations to improve regional efforts that assess natural resources for conservation and sustainable management. (Vollmer et al.,2018) have presented the social-ecological framework named the Freshwater Health Index (FHI), which takes account of the interplay between governance, stakeholders, freshwater ecosystems and the ecosystem services they provide.In this work, we develop decision support and making tools for natural resources conservation in the Lower Mekong by leveraging the FHI framework, multiple data products, and hydrological modeling capabilities (Mohammed et al., 2018). Modeling capabilities enable the integration of satellite-based daily gridded precipitation, air temperature, digital elevation model, soil characteristics, and land cover and land use information to simulate water flux framework

Thermal Radiation Effects on Mhd Free Convection Flow of a Micropolar Fluid Past a Stretching Surface Embedded in a Non-Darcian Porous Medium

A comprehensive study of thermal radiation on a steady two-dimensional laminar flow of a viscous incompressible electrically conducting micropolar fluid past a stretching surface embedded in a non-Darcian porous medium is analyzed numerically. The governing equations of momentum, angular momentum, and energy equations are solved numerically using Runge- Kutta fourth order method with shooting technique. The effects of various parameters on the velocity, microrotation, and temperature field as well as skin friction coefficient, and Nusselt number are shown graphically and in tabulated. It is observed that the micropolar fluid helps in the reduction of drag forces and also acts as a cooling agent. KEYWORDS: Micropolar fluid, Free convection, Darcy number,Radiation, MHD,  Porous medium

Traditional bone setting: an avoidable cause of major limb amputations

Background: Despite the availability of modern health care services, patients in Nigeria still seek treatment by traditional bone setters. One of the major complications of this type of native fracture treatment is limb gangrene necessitating amputations. The objective of this study was to determine the role of traditional bone setting in major limb amputations.Methods:  This retrospective study was carried out at a government orthopedic referral hospital. The study involved all patients who underwent major limb amputation between January 2015 and December 2019 in our center. Data were retrieved from medical records and operation registers. Information regarding age, sex, indications and levels of amputation and complications were studied.Results: During the study period; of the 297 major limb amputations performedd, 194 (65.3%) were due to traditional bone setting. The median age of the patients was 11.0 years (1 to 45 years) and the interquartile range was 10 years. Majority of the patients 86 (44.3%) affected were children less than 10 years of age. Male were more affected than female (M:F=1:2). Lower limb is more affected than the upper limb. The commonest amputation done was below knee amputation in 79 (40.7%) of cases. The commonest complication was surgical site infection which occurred in 32 (16.5%) patients.Conclusions: Traditional bone setting is a leading cause of major limb loss especially in children

A case of uterine gangrene after termination of second trimester pregnancy complicated by chorioamnionitis

Uterine gangrene is a rare event during pregnancy. Here, we report the case of a 22-year-old patient pregnant in her second trimester presenting with premature rupture of membranes and a low-lying placenta. Hysterotomy was done to evacuate the pregnancy. The procedure was complicated by hemorrhage so bilateral uterine arteries and the left internal iliac artery were ligated to control the bleeding. She continued to run a fever in spite of antibiotics and on the 11th postoperative day, the patient developed signs of septicemia. Abdominal re-exploration was done revealing a gangrenous uterus with signs of peritonitis. Subtotal hysterectomy was done. The patient was discharged from the hospital in good health on the 10th post repeat laparotomy day

Vehicle in-cabin contactless WiFi human sensing

We demonstrate in-cabin WiFi-based sensing in a real vehicle, tracking a passenger's breathing rate in real-time

A comprehensive review on the exergy analysis of combined cycle power plants

The arriving optimum improvement of a thermodynamic system of energy conversion such as a combined cycle power plant (CCPP) is complicated due to the existence of different factors. Energy and exergy analysis is utilized as effective methods to determine both the quantity and quality of the energy sources. This paper reviews the latest thermodynamics analysis on each system components of a CCPP independently and determine the exergy destruction of the plant. A few layouts of the CCPP plant from different locations considered as case studies. In fact, the most energy losses occurred in the condenser compared with the plant components. It found that in the combustion chamber (CC) the highest exergy destruction occurred. The ambient temperature causes an evident decrement in the power production by the gas turbine (GT). The result has proved that besides energy, exergy analysis is an efficient way to the assessment of the performance of the CCPP by recommending a more advantageous configuration of the CCPP plant, which would lead to reductions in fuel required and emissions of air pollutants

CT SCAN IMAGES ANALYSIS OF MAXILLARY SINUS DIMENSIONS AS A FORENSIC TOOL FOR SEXUAL AND RACIAL DETECTION IN A SAMPLE OF KURDISH POPULATION

Despite the fact that the skull and other bones may be badly disfigured in victims who are incinerated, it became an urgent necessity to gender determination using maxillary sinuses as a useful tool of human skeletons in forensic medicine. The aim of the study: to determine the reliability and accuracy of maxillary sinus dimension measurement as a method for gender and racial identification through the use of reconstructed helical CT images. Material and Methods: This prospective study included cranial computerized tomography images (CT) of 119 (M: 57 and F: 62) of the Kurdish population of Sulaimani city of Iraq with an age range (20 - 75) years. All patients were examined on Spiral Computed Tomography Scanner from October 2014 to March 2015.The greatest measurements were taken from the width, length, and height of the maxillary sinuses. The descriptive and discriminate analyzes were performed by using the SPSS package program. Results The mean of the length, the width, and the height of maxillary sinus in males on both right and left sides were (35.90± 4.71, 36.63 ± 5.34) (25.74 ± 5.69 , 25.36 ± 6.03) and (32.86 ± 7.00 , 33.13± 6.87) mm, respectively but in females were (34.58 ± 4.21, 35.60 ± 3.94 ), (22.54 ± 4.74 and 21.53 ± 4.47) and (29.16 ± 7.20,29.25 ± 6.17 )mm respectively. The present study showed that the left maxillary sinus width was the best discrimination parameter, that could be used to study sex dimorphism with Prediction of 69.4% for female and 52.6% for male (overall accuracy = 61. 3%). The discriminative analysis showed that the accuracy of maxillary sinus measurements-i.e the ability of the maxillary sinus size to identify gender-was 71% in females and 56.1% of males (overall accuracy = 63.9%). Conclusion The study showed that the diameters of the maxillary sinus can be used as a guide and a useful tool for racial and sex determination

CT SCAN IMAGES ANALYSIS OF MAXILLARY SINUS DIMENSIONS AS A FORENSIC TOOL FOR SEXUAL AND RACIAL DETECTION IN A SAMPLE OF KURDISH POPULATION

Despite the fact that the skull and other bones may be badly disfigured in victims who are incinerated, it became an urgent necessity to gender determination using maxillary sinuses as a useful tool of human skeletons in forensic medicine. The aim of the study: to determine the reliability and accuracy of maxillary sinus dimension measurement as a method for gender and racial identification through the use of reconstructed helical CT images. Material and Methods: This prospective study included cranial computerized tomography images (CT) of 119 (M: 57 and F: 62) of the Kurdish population of Sulaimani city of Iraq with an age range (20 - 75) years. All patients were examined on Spiral Computed Tomography Scanner from October 2014 to March 2015.The greatest measurements were taken from the width, length, and height of the maxillary sinuses. The descriptive and discriminate analyzes were performed by using the SPSS package program. Results The mean of the length, the width, and the height of maxillary sinus in males on both right and left sides were (35.90± 4.71, 36.63 ± 5.34) (25.74 ± 5.69 , 25.36 ± 6.03) and (32.86 ± 7.00 , 33.13± 6.87) mm, respectively but in females were (34.58 ± 4.21, 35.60 ± 3.94 ), (22.54 ± 4.74 and 21.53 ± 4.47) and (29.16 ± 7.20,29.25 ± 6.17 )mm respectively. The present study showed that the left maxillary sinus width was the best discrimination parameter, that could be used to study sex dimorphism with Prediction of 69.4% for female and 52.6% for male (overall accuracy = 61. 3%). The discriminative analysis showed that the accuracy of maxillary sinus measurements-i.e the ability of the maxillary sinus size to identify gender-was 71% in females and 56.1% of males (overall accuracy = 63.9%). Conclusion The study showed that the diameters of the maxillary sinus can be used as a guide and a useful tool for racial and sex determination

Synthesis of Heterocyclic Compounds Via Chalcone Derivatives and Study Activity of Some these Compounds as Pesticides (Anti-Dubas)

In this research, we synthesized oxazine and thiazine derivatives (3-6). These derivatives of chacone compounds (1 and 2) that synthesized from 4- hydroxyacetophenone and aldehyde derivatives such as, 4-bromobenzaldehyde and 4- chlorobenzaldehyde. These derivatives of chalcone (1-2) reacted with urea to produce oxazine derivatives as 4-[4-amino-6-(4-subsutitedphenyl)-2H-1,3-oxazin-2-yl] phenol (3 and 4) and thiourea to produce 4-[4-amino-6-(4-subsutitedphenyl)-2H-1,3-thiazin-2-yl] phenol (5 and 6). These derivatives were characterization by spectroscopy methods such as, FTIR and 1HNMR. Some compounds (3 and 5) that synthesized tested as Pesticides (anti-dubas) through the spray method and these derivatives killed Dubas and we noted the compound 5 was more active from compound 3 because compound 5 have been S atom in his structure that bonded in active group in dubas by effect on Cholinesterase enzyme in the insect