The effect of cyclic twist angle on mechanical properties for AISI 1038 medium carbon steel

A group of 11 specimens AISI 1038 Medium carbon steel alloy fabricated according to ASTM standard D790-02 torsion test were twisted cyclically one in positive another to negative angle in range of angles (0o-50o), step 5 degrees for each specimen. The data from torsion test device help to get actual torques and shear stresses, later the specimens tested the tensile test to figure out the effects of cyclic angle of twist on mechanical properties for AISI 1038 Medium carbon steel. The results showed a good agreement between the theoretical and actual data (torque, shear stress) for specimens with positive angle of twist by the percentage: 98%, 91%, 96%, 93%, 91%, 89%, 88%, 85%, 82%, 81%, 80%. In other side the results for experimental tests showed a dangerous decrements in mechanical properties for cyclic or negative twist angles, the yield stress for reference specimen without twist angle is 490 Mpa, yield stress increased for angels (5o,10o,15o) by 1%, 3%, 6%, then decreased for angels (20o,25o,30o,35o,40o,45o) by 3%, 5%, 13%, 18%, 24% and 35% Respectively and the final specimen with 50o angle of twist had been broken torsional before tensile test as a result specimens groups consequent of the extrusion – intrusion defects concomitant from twisting load

Staphylococcus epidermis and acne scar inflammations in young people

Staphylococcus epidermidis is a resilient microbe distinguished by its immobile, Gram-positive spherical cells that aggregate in clusters resembling grape clusters. Biochemical examinations reveal a faintly positive outcome in the nitrate reductase test for this microbe. It generates urease while lacking oxidase production. S. epidermidis possesses a transferrin-binding protein that facilitates the acquisition of iron from transferrin. The formation of biofilms on plastic devices plays a pivotal role in the pathogenicity of S. epidermidis and its connection to acne. This adaptable bacterium is frequently encountered as a nosocomial and commensal pathogen, recognized for its opportunistic behavior and its global impact on infections, primarily contracted within healthcare facilities. It displays a remarkable ability to establish strong biofilms on various surfaces, contributing to infections linked to catheters and heart valve implants. The transmission of the bacterium is easily facilitated through the contamination of the skin of hospital visitors and healthcare personnel

EVALUATION OF THIN FILM COMPOSITE FORWARD OSMOSIS MEMBRANES: EFFECT OF POLYMER TYPE

In the forward osmosis (FO) processes, the semipermeable membranes are used. These membranes are prepared from several types of polymers. In this research, the characterizations of each polymer were studied to conversance the effect of polymer type on the efficiency of the forward osmosis process. The prepared membrane’s roughness was investigated using atomic force microscopy (AFM) and scanning electron microscopy (SEM) to compare the formation of the TFC polyamide selective layer on each polymer type. Also, SEM images showed the distribution of pores on the prepared membrane. Contact angle (CA) measurements explained the hydrophilic and hydrophobic properties of membrane types. Finally, Energy dispersion spectrometry (EDS) was tested to determine the type, amount, and distribution of atoms in the prepared membranes. All of these characterizations proved that the Polysulfone (PSU) polymer was the best choice in the FO process. It can be proved that by test results, the PSU membrane gave the optimal water flux and salt rejection

Inhibition Evaluation of 5-(4-(1H-pyrrol-1-yl)phenyl)-2-mercapto-1,3,4-oxadiazole for the Corrosion of Mild Steel in an Acidic Environment: Thermodynamic and DFT Aspects

In this investigation, an oxadiazole namely 5-(4-(1H-pyrrol-1-yl)phenyl)-2-mercapto-1,3,4-oxadiazole (PMO), was synthesized and explored as an inhibitor against the corrosion  of mild steel in 1.0 M hydrochloric acid environment at various solution temperature 303-333 K. gravimetric, and microscopic techniques, namely, weight loss (WL), and scanning electron microscopy (SEM), have been used to evaluate the inhibitive performance of the tested PMO. The results of the WL method displayed that the inhibition efficiency (%IE) was found to increase with the inhibitor concentration, while it reduced with increasing temperature. Furthermore, the WL results reveal that PMO inhibits corrosion display an IE of 95% at the highest concentration of 0.005 M. The SEM images of the mild steel surface coupon after adding PMO revealed a wide coverage of PMO molecules on the mild steel surface. Hence, the high inhibiting efficiency acquired by the tested inhibitor was explained by the strong adsorption of PMO molecules on the surface of mild steel. A protective layer has been constructed and it separating the mild steel surface from the hydrochloric acid solution, and such adsorption was found to obey Langmuir adsorption isotherm. Moreover, the thermodynamic parameters suggested that the adsorption nature of PMO molecules on the coupon surface was chemo-physisorption. Quantum chemical calculations were conducted by density functional theory (DFT) which help correlate the methodological findings with the theoretical investigations. The mechanisms of PMO molecules as corrosion inhibitor for mild steel surface in the corrosive environment was also discussed

Emerging wireless communication technologies in Iraqi government: Exploring cloud, edge, and fog computing

This study aims to structure the implementation of a governmental cloud of things (CoT), edge computing (EC), and fog computing in Iraq in the context of sustainable wireless communication. A base of literature was built that included any challenges, opportunities, and best practices relevant to these innovative technologies to set up the background for this paper. A concept model was created that included core components (cognitive technologies and fog computing), key processes (resource analysis, infrastructure design), and stakeholders (governments, industry, community). A strategic methodology made up of stakeholder involvement, capacity building, and pilot projects was used in the project. Concerning IoT planned deployment and services provision, network infrastructure was put in place to support the devices and a higher level of security measures were recommended. Using scenario hypothesis, MATLAB simulator was employed to simulate data value distribution as well as received power distribution based on different institutions for 12 months. Monitoring and evaluation should be followed to measure performance indicators and effects on this process. Continuously improvement strategies were the highlight of the session which further stimulated innovations. Acquainted projects will be put in the function to extend the range of activities by including additional government agencies, regions, or sectors. Reporting of the collected data and funding will be done with stakeholders to share and pool knowledge

Cloud of Things and fog computing in Iraq: Potential applications and sustainability

This paper depicts the principles of Cloud of Things and fog computing and discusses its possible uses in Iraq with sustainability measures. The capacity of cloud computing to supply elastic, as-needed computer resources has garnered widespread interest worldwide. However, fog computing and a Cloud of Things enhance the Internet of Things by relocating computation to devices on the network's periphery. This study looks at how the Cloud of Things and fog computing are used now in Iraq, the obstacles, and the future uses of these technologies in various fields. To fully reap the benefits of the Cloud of Things and fog computing in Iraq, the study also emphasizes the significance of infrastructure development, policy design, cybersecurity, and other measures. This study will discuss the use of questionnaires in research. There are two distinct components to this. The first section includes questions regarding the respondents' affiliations, including their roles, departments, organization sizes, and ministries. The rest of the study's factors are discussed with inquiries in line with issues of cyber security, privacy, sustainability, cost of implementation, feasibility, trust, IT infrastructure, and government support. The survey's final open-ended inquiry will help us to compile a wide range of perspectives on what kinds of Cloud of Things and fog computing services based on the Iraqi government's needs

Gravitational bullet injuries

Gravitational bullet injuries, prevalent in the Middle East, particularly in Iraq, are a critical public health concern, often resulting from celebratory gunfire. In our Neurosurgery Teaching Hospital in Baghdad, we've observed that these injuries differ significantly from high-velocity gunshot wounds, characterized by lower velocity and energy due to air resistance and gravity. Unlike high-velocity bullets, gravitational bullets cause less bone fragmentation and radial brain damage. These bullets often end up on the tentorium or within the skull base, rarely transgressing the cerebellar tentorium on a vertical trajectory.  We've also noticed that the pediatric population, particularly younger children, are more susceptible to these injuries due to their thinner cranial vertex, leading to more penetrating injuries and aggressive brain bleeding. Our observations underline the need for focused studies, awareness, regulation, and tailored management strategies to combat this overlooked issue

Punching shear behavior of flat slabs utilizing reactive powder concrete with and without flexural reinforcement

This article investigates the effect of flexural reinforcement and ultrafine steel fiber on the punching shear of reactive powder concrete (RPC) slabs with different thicknesses. Ten RPC slabs and two normal-strength concrete (NSC) slabs were cast and tested with dimensions of 520×520 mm. According to test parameters, these slabs were arranged into three sets. These parameters were the percentage of ultrafine steel fiber, presence/absence of flexural reinforcement, and thickness of the slab. All slab specimens were simply supported along the four edges and concentrically loaded by a square plate with dimensions of 70×70 mm. The experimental results indicated superior and higher performance for RPC slabs compared with NSC slabs in which the punching shear resistance of RPC slabs increased by 78.8%, 92.5%, and 100.8% for RPC slabs containing steel fibers of 1%, 1.5%, and 2%, respectively, as compared with NSC slabs with the same thickness. Also, the presence of flexural steel reinforcement in the slab resulted in a higher ultimate punching shear strength compared with the similar slab without flexural steel reinforcement. Moreover, with increasing the slab thickness, the ultimate punching shear increased significantly and the ultimate deflection decreased as the flexural rigidity of the section increased. Finally, the results showed that it is possible to produce thin RPC slabs with 2% microsteel fibers and without flexural reinforcement to able to sustain the ultimate load, which are comparable with reinforced and nonreinforced normal concrete slabs, which is very crucial for designers who need to reduce the reinforcement amount required with beneficial effects on the cost and self-weight reduction for many structural applications

RPC Effect of Crude Oil Products on the Mechanical Characteristics of Reactive-Powder and Normal-Strength Concrete

This study includes detailed information on the mechanical characteristics of the hardened concrete mix for normal concrete (NSC) and reactive powder concrete (RPC) after exposure to crude oil products. Two types of crude oil products (kerosene and gas oil) were investigated after exposure for a period of 180 days. The experimental program consisted of three sets of NSC and RPC specimens; after curing all concrete specimens for 28 days and 2 days to dry in the air, the first set of specimens was immersed in kerosene for 180 days and the second set was immersed in gas oil for the same age, while the third set was left in the air as a reference set (cured normally for 28 days and tested at the age of 180 days). The results showed that the mechanical characteristics of the RPC mix were not highly affected after exposure to each type of crude oil products, where it lost about (3.41–6.32 %) compared with reference RPC mix. While the NSC mix lost about (13.82–21.95 %) of its mechanical characteristics compared with reference NSC mix after exposure to crude oil products for the same period

Spontaneous intracerebral haemorrhage as an initial presentation of a choriocarcinoma: A case report

Introduction: Choriocarcinoma is a rare gestational trophoblastic neoplasm with a high risk of pulmonary, hepatic, and, rarely, cerebral metastasis. We report a rare case of intracerebral haemorrhage as an initial manifestation of metastatic choriocarcinoma.  Case presentation: A 33-year-old female with a history of multiple abortions, ectopic pregnancy, and complete hydatidiform mole presented with a disturbed level of consciousness. Emergency brain computed tomography (CT) scan revealed an intraventricular haemorrhage (IVH) and a left frontoparietal, non-traumatic intracerebral haemorrhage (ICH) with a significant midline shift. The patient underwent emergency evacuation of the hematoma and histological evaluation revealed choriocarcinoma. Later investigations revealed evidence of systemic metastasis. The patient underwent chemoradiotherapy and recovered well.  Conclusion: Metastatic choriocarcinoma should always be in the differential of non-traumatic intracerebral haemorrhage in a female child-bearing age. Also, the pathological diagnosis should always be performed in cases of ICH of an unknown source.        &nbsp