Recognition of corona virus disease (COVID-19) using deep learning network

Corona virus disease (COVID-19) has an incredible influence in the last few months. It causes thousands of deaths in round the world. This make a rapid research movement to deal with this new virus. As a computer science, many technical researches have been done to tackle with it by using image processing algorithms. In this work, we introduce a method based on deep learning networks to classify COVID-19 based on x-ray images. Our results are encouraging to rely on to classify the infected people from the normal. We conduct our experiments on recent dataset, Kaggle dataset of COVID-19 X-ray images and using ResNet50 deep learning network with 5 and 10 folds cross validation. The experiments results show that 5 folds gives effective results than 10 folds with accuracy rate 97.28%

Occupational safety basics understanding in oil and gas industry: An evaluation

In project management, risk is a surprise that might be resulted in a good, or bad, impact on a project. However, people tend to consider it a threat. This study is an evaluation work to the understanding of the risk management and safety culture of the construction sector in oil and gas industry in Iraq. A survey questionnaire was prepared, tested, distributed to a sample of engineers, from several engineering specialties, who are working on different levels in the mentioned sector. A high percent of the respondents are safety engineers, and some have a higher university degree, e.g. MS an Ph.D. The collected data then analyzed using different statistical approaches. The results show that there is a good understanding of the safety in general among engineers. However, risk management and planning tools are not understood effectively among the respondents. Moreover, having a higher degree or specializing in different majors have no impact on perceptional understanding of the safety and risk. This study is one of the first steps in studying the occupational safety in Iraq construction and oil and gas industries. Since Iraq is considered for rebuilding after different wars, international firms are in need to understand how safety is managed and to what level it is applied. From this perspective, this study is one of studies that help achieving the firms’ goal regarding safety

State Feedback Sliding Mode Controller Design for Human Swing Leg System

In this paper, the robustness properties of sliding mode control (SMC) which is designed to produce a dynamic output feedback controller to achieve robustness for trajectory tracking of the nonlinear human swing leg system is presented. The human swing leg represents the support of human leg or the humanoid robot leg which is usually modeled as a double pendulum. The thigh and shank of a human leg will respect the pendulum links, hip and knee will connect the upper body to thigh and then shank respectively. The total moments required to move the muscles of thigh and shank are denoted by two external (servomotors) torques applied at the hip and knee joints. The mathematical model of the system is developed. The results show that the proposed controller can robustly stabilize the system and achieve a desirable time response specification

Numerical analysis of RC columns under cyclic uniaxial and biaxial lateral load

U ovom se radu prikazuje numerička analiza konačnih elemenata koja je provedena kako bi se ispitalo ponašanje AB stupova visoke čvrstoće za slučaj dvoosnog i jednoosnog bočnog pomaka pri konstantnom uzdužnom opterećenju. Numerička analiza provedena je na 24 modela pomoću programa ABAQUS / CAE. Validacijom je utvrđena dobra podudarnost numeričkih i eksperimentalnih rezultata. U okviru parametarske studije određen je koeficijent armiranja uzdužnom armaturom, ukupna ploština spona za ovijanje (Ash) te jednoosno i dvoosno ciklično posmično opterećenje. Rezultati numeričke analize pokazuju da povećanje količine uzdužne armature u slučaju jednoosnog i dvoosnog bočnog opterećenja dovodi do znatnog povećanja maksimalnog i graničnog opterećenja stupova, progiba, broja ciklusa maksimalnog i graničnog opterećenja, te početne krutosti Ki, dok je utjecaj poprečne armature manje izražen. Otpornost stupova na opterećenja i deformacije znatno se smanjuje pri nanošenju dvoosnog cikličnog posmičnog opterećenja, u odnosu na jednoosno opterećenje. Isto tako, taj utjecaj se smanjuje s povećanjem udjela uzdužne armature (%ρl) i vrijednosti Ash.A numerical finite element study is conducted in this paper to examine structural behaviour of high strength RC columns exposed to biaxial and uniaxial lateral displacement histories with constant axial load. The numerical analysis of 24 models was made using ABAQUS / CAE. The comparison between numerical analysis and experimental results shows good agreement through validations. The considered parametric study involves determination of the longitudinal reinforcement ratio, total cross-sectional area of confinement steel (Ash), and uniaxial and biaxial cyclic shear load. Numerical analysis results show that an increase of longitudinal reinforcement for a uniaxial and biaxial lateral historic load will significantly increase maximum and ultimate load of columns, corresponding deflections, number of cycles at maximum and ultimate loads, and initial stiffness Ki, while the effect of transverse reinforcement is less pronounced. The columns load and deformation capacity decreases significantly with application of biaxial cyclic shear load, compared with uniaxial load. Also, this effect reduces with an increase in longitudinal reinforcement ratio (%ρl) and Ash

Numerical analysis of RC wall with opening strengthened by CFRP subjected to eccentric loads

U radu je provedeno numeričko ispitivanje središnjeg otvora u ab zidovima s CFRP ojačanjem i bez njega podvrgnutim ekscentričnom vertikalnom opterećenju s linearnim prirastom. Šest zidnih ploča u mjerilu 1 : 2 modelirane su u računalnom programu ABAQUS u svrhu procjene učinka ojačanja. Analiza je pokazala da na nosivost zida u smislu maksimalnog opterećenja utječe debljina CFRP-a. Utvrđeno je da varijacija debljine CFRP-a ima značajan utjecaj na krajnju nosivost, pojavu pukotina, glavnu plastičnu deformaciju betona i ekvivalentno naprezanje.Numerical analysis of the central hole in RC walls with and without CFRP, subjected to uniform eccentric vertical line load, is presented in this paper. Six half-scale wall panels were modelled using the ABAQUS software to estimate the strengthening effects. The analysis revealed that the load capacity of the wall in terms of maximum load carrying capacity is influenced by CFRP thickness. It was found that the variation of CFRP thickness greatly influences the ultimate load carrying capacity, crack patterns, principal plastic strain of concrete, and equivalent stress

Numerical analysis of reinforced concrete circular columns strengthening with CFRP under concentric and eccentric loadings

The purpose of this study is to explore the numerical behavior of circular Reinforced Concrete (RC) short columns with different degrees of confinement with Carbon Fiber Reinforced Polymer (CFRP) (0%, 25%, 50%, and 100%) wraps under concentric and eccentric loading. The numerical analysis carried out by using an improved Concrete Damage plasticity (CDP) model implemented in ABAQUS software for finite element (FE) analysis. The FE model simulated a total of twenty-four numerical specimens. The findings were matched to published experimental test results in the literature. The findings of the FE model and the experimental data were good similar. As a consequence, the model was found to be valid. The numerical results shows that as load eccentricity increased, the load carrying capacity of columns decreased for unconfined specimens, whereas the decline in strength for confined specimens becomes limited as the degrees of confinement ratio increased. In addition, increasing the CFRP confinement ratio improves the column's load-bearing capability at the same load eccentricity

Finite Element Analysis of RC Tapered Beams under Cyclic Loading

This paper presents a numerical investigation to study the effect of variations in displacement history sequence and magnitude on cyclic response of RC tapered (haunched) beams (RCHBs).Five simply supported RCHBs (four haunched and one prismatic) were selected from experimental work carried out by Aranda et al. The selected variables included were five loading history types. The first part of this study focused to verify the finite element analysis with selected experimental work and the second part of this study focused too studying the effect of varying in loading history to the response of RCHBs. The finite element code Abaqus was used in the modeling. The adopted cyclic simulation performance of the selected beams using the plastic- damage model for concrete developed by Lubliner and Lee & Fenves. The constitutive model of plain concrete describing the uniaxial compression response under cyclic loading proposed by Thorenfeldt, and the uniaxial tension response follows the softening law proposed by Hordijk was used in the modeling. Menegotto-Pinto model was used to simulate the steel response. Model verification has shown A good agreement to the selected experimental work. The variations in loading history will decrease the ultimate load and corresponding deflection with increase in the number of cycles at ultimate load

Assessment of Quality of Life in a Sample of Iraqi Patients with Psoriasis.

Psoriasis is a dermatological, chronic, immune-mediated condition. Psoriasis symptoms are not associated with physical burden only, but it may also have psychosocial effects on patients, diminished cognitive control, poor body image and impairments in everyday life. The value of quality of life is important since improving it is the principal goal for non-curative disease. The aim of the current study was to evaluate quality of life in a sample of Iraqi patients with psoriasis. This study is a cross-sectional study that involved 300 already diagnosed psoriasis patients who attended to the center of Dermatology and Venereology, Medical City/Baghdad. The mean age of patients was (35.156 ±10.549 years). The Arabic version of Dermatology Life Quality Index was used to assess quality of life.  The mean total score is 11.29± 5.45 and the majority of the patients (53.7%) had a total score of more than 10, which indicates a significant deterioration in patients’ quality of life. The greatest impact was found in symptoms and feelings (mean = 1.66 ± 0.75) while the lowest impact was noted in personal relationships (0.51± 0.65). Increasing age and monthly income as well as vulgaris type of psoriasis associated significantly better quality of life. While Psoriasis Area and Severity Index associated significantly worse quality of life. In conclusion, psoriasis exerts significant, negative impact on patients’ quality of life, especially among those with younger age, lower monthly income, high disease activity, and types of psoriasis other than vulgaris.  

Experimental and Numerical Investigation of High Strength Reinforced Concrete Deep Beams with Web Openings under Repeated Loading

          Abstract This paper presents experimental investigations to study the behavior of High Strength Reinforced Concrete (HSRC) deep beams with web openings under monotonic and static repeated loading conditions. The experimental work procedure consisted of testing eighteen simply supported HSRC deep beams both with and without web openings. The numerical work procedure consisted of testing ten simply supported HSRC deep beams both with web openings. All beams had the same dimensions and flexural reinforcement. They had an overall length of 1400 mm, a width of 150 mm and a height of 400 mm. The investigated test parameters were concrete compressive strength, shape and size of openings, vertical and horizontal reinforcement ratios, shear span to effective depth ratio (a/d ratio) and loading history. The experimental results reveal that the ultimate load capacities for specimens tested under four different repeated loading regimes decrease in the range between 2% and 19% in regards to the control specimens which were tested under monotonic loading regime.  The results indicated that the increase in the severity of loading history leads to a decrease in the ultimate shear strength of the deep beams and causes increases in their ductility ratio. The ultimate loads of HSRC deep beams with square web openings size of (50*50mm, 60*60mm and 70*70mm) tested under the repeated loading history (HS-1) which consisting of five phases decreased by (11.4 %, 24.1% and 26.3 %, respectively)  compared to that of identical solid deep beam. The ultimate load of HSCR deep beam with circular web openings shape tested under repeated loading history (HS-1) increases by 8.6 % compared to the equivalent square web openings shape. For numerically analyzed beams under repeated loading history (HS-1), the ultimate load increases by 16% when using area of 2500mm2 of circular web openings shape (equal in area to square web opening size 50mm*50mm) and by 13.5% when using rhombus web openings shape of the dimensions 50*50mm in comparison with the case of 60-mm size square web openings