Laser Beam Welding of Austenitic Stainless Steels – Similar Butt and Dissimilar Lap Joints

Because of its inherent corrosion resistance, austenitic stainless steels, known as 300 series, have become cost-effective, staple materials for long-term applications in many industrial sectors including gas, petroleum, petrochemicals, fertilizers, food processing, and pulp industries as well as power generating plants. They have found also widespread use for manufacturing of chemical installations including stationary pressure tanks and tanks for transport of liquid and compressed gases, pipelines of high diameter in water power plants, for manufacturing of ships for transport of chemicals and installations of drilling rigs, etc. Thick-section stainless steels are widely used in the components and structures for nuclear power plants

Synthesis and antimicrobial evaluation of some new polyheterocyclic systems containing 1,2,4-triazine moiety

7-(4-Chloro/3-nitrophenyl)-8-[5,6-diphenyl-4-(1,3-thiazol-2-yl)-1,4-dihydro-1,2,4-triazin-3-yl]-5-oxo-1,5-dihydro[1,2,4]triazolo[1,5-a]pyridine-6-carbonitrile (6a, b) was utilized as a key intermediate for the target polyheterocyclic systems. Reactions of 6a, b with halocarbonyl reagents followed by heterocyclization with bi-nitrogen nucleophiles gave some new nitrogen heterocycles (7-13). Structures of the new compounds were established by elemental analyses and spectral data. The synthesized compounds were screened for their antimicrobial activity

Prevalence of Pressure Ulcers with the Study of the Impact of Pressure Ulcer Educational Program on Registered Nurses’ Knowledge and Practice in Prince Miteb Bin Abdulaziz Hospital, Sakaka City, Saudi Arabia

Critically ill patients are at high risk for pressure ulcers. Prevalence differs based on settings but is 25% on the average. Cost of its treatment is two and a half times the cost of preventing them. Its development is an index of poor Nursing care. Nursing remains at the forefront of protecting and safeguarding the patient from pressure ulcers. Successful prevention of pressure ulcers requires that caregivers have adequate knowledge of this complication and preventive practice measures. This study describe the prevalence of pressure ulcers among inpatients of ICU and CCU departments, assess intensive care nurses’ knowledge and practice about pressure ulcers management and the impact of an educational program on knowledge and practice. An experimental research design was adopted to conduct the study on (39) nurses working in Intensive Care Units  of Prince Miteb Bin Abdulaziz  Hospital, Sakaka City, Saudi Arabia. Two tools were used for data collection: Knowledge questionnaire sheet and observation checklist. Completion of the educational program resulted in improved levels of nurses' knowledge  and practice regarding PU management. Findings of the present study suggest continued nursing education for the enrichment of nurses' knowledge and augmenting their practices about identification, prevention and management of pressure ulcer is effective in minimizing pressure ulcer for immobilized patients. Keywords: key words, Nurses’ Knowledge, Nurses’ Practice, Pressure Ulcer Prevention, educational programs

The effect of beam width and crack-depth ratio on mode I fracture toughness of RCB: an experimental and numerical study

In the present work, the fracture performance of pre-cracked reinforced concrete beams was investigated numerically and experimentally. Experimental and numerical programs were designed to examine the effect of beam width, b, (120 and 250 mm) and crack-to-depth ratio, a/d, (0.1, 0.2 and 0.3) for concrete strength, fc, (40 MPa), on the behavior of stress intensity factor, K1C, and fracture energy, G, for reinforced concrete, RC, beams. The work utilized beams with three-point loading conditions experimentally. Through the use of the ANSYS program, a comprehensive 3-D finite element analysis was conducted with utmost precision to simulate and idealize all experimental specimens. It has been confirmed through numerical and experimental outcomes that the stress intensity factor for RC concrete beams experiences a significant increase as the  a/d  increases.  Furthermore, the fracture toughness values in this study show a slight increase due to the utilization of RC concrete beams with wider width. The validity of the presented concept was demonstrated by comparing the experimentally measured load vs. deflection values to the predicted numerical values and finding them to be acceptable

Salinity stress mitigation of some canola cultivars grown under South Sinai conditions using magnetic water technology

Salinity stresses either in irrigation water and/or soil is one of the most serious agricultural problems facing farmers in arid and semi-arid regions included Egypt.  Many areas in the Sinai region depend mainly on the underground water of various degrees of salinity that prevent cultivated crops from reach to the full yield. Under these conditions, a split-plot field experiment using three canola cultivars; Pactol, Serw-4 and Serw-6 under three irrigation water treatments: i) Brackish-water (BW), ii) Magnetic-BW1; brackish water after magnetization through passing a three inch static-magnetic unit,3.75 mT, produced by Delta Water Company, Egypt and iii) Magnetic-BW2; brackish water after magnetization through passing a three inch static magnetic unit, 0.75 mT, produced by Magnetic-Technologies Company, UAE, was carried out at Agricultural Experimental Station of Desert Research Centre, Ras Sidr region, South Sinai Governorate, Egypt during the 2017/18 winter season. The results showed that irrigation with M-BW1 or M-BW2 surpassed irrigation with BW in all tested growth parameters (plant height, branches and leaf number/plant, leaf area, dry matter of leaves, stem and total plant, and total chlorophyll); leaf anatomy (instance, midvein and lamina thickness, length and width of leaf vascular bundle and lower and upper epidermis thickness); stem anatomy (stem diameter and thickness of cortex, xylem and phloem in addition pith diameter) and chemical analysis for mineral content (N, P, K, Mg, Fe, Cu, Zn ) at 85 days after sowing (DAS). As an average of both magnetically brackish-water treatments over tested three canola varieties, the percent of improvement compared to irrigation with brackish-water ranged between 10.78-16.02% for growth parameters, 28.33-31.76% for dry matter of plant; 15.58 -80.81% for leaf ; 10.71-63.88% for stems and 2.42-54.48% for mineral content of leaves at 85 DAS. Reverse trends were observed in the best indicators for alleviation salinity stress (Na, and proline), where these decreased under both magnetic brackish water treatments by 66.08 and 43.75%, respectively (average of both magnetically  brackishwater treatments compared to BW water treatment). Generally, the three tested canola varieties showed a positive response under magnetic brackish water treatments. The positive results in above-mentioned parameters of vegetative growth reflected improvement in canola yield and its components. The percent of improvement ranged between 9.35 and 35.98 for yield components and reached1.29,19.66 and 21.30% in seed oil percentage, seeds and oil yield (kg fed-1; fed=4200 m2), respectively compared to brackish water.&nbsp

エジプト北東部における下部古生界アラバ層の堆積学、地球化学および貯留岩特性

博士(理学)大阪市立大

Experimental and numerical evaluation of compression confinement techniques for HSC beams reinforced with different ratios of high strength steel reinforcement

This work presents experimental and numerical research to evaluate the compression confinement techniques of HSC beams reinforced with different ratios of high-strength steel reinforcement. Twelve specimens of high-strength reinforced concrete beams with two different compression confinement techniques were tested experimentally. The first method is used carbon fiber reinforced polymers sheets (CFRPs) around the compression zone, CF, and the steel fibers reinforced concrete is used in the compression zone by 1% of volume fraction, SF, in the second case. A 3-D finite element analysis was done; using the ANSYS program to simulate and idealize all experimental specimens. The numerical and experimental results of the RC beams were validated and compared in this work. The results showed that there is a good idealization using 3-D finite element models with the experimental specimens. Also, it was found that using the suggested techniques can increase the strength ratio and increase the ductility index depending on the tensile reinforcement ratios. Moreover, the energy absorption and the mode of failure were enhanced

Use of rhamnolipid to remove heavy metals from aqueous streams via micellar enhanced ultrafiltration

In this research, the rhamnolipid biosurfactant was utilized in micellar-enhanced ultrafiltration (MEUF) of heavy metals from contaminated waters. The effects of different major operating conditions on the (MEUF) system performance were investigated for copper, zinc, nickel and cadmium using two membranes. The optimal conditions were successfully applied to treat six contaminated wastewaters from metal refining industries and three contaminated groundwaters using the two membranes (> 99% rejection ratio). To efficiently choose the most influential factors to the MEUF system, optimization by the response surface methodology approach was utilized and data quality was examined. Three studies were performed in order to investigate the mechanism and the interactions between the heavy metal ions and the rhamnolipid micelles in the rhamnolipid-based UF system. The first study successfully investigated the applicability of Gouy-Chapman approach for binding of heavy metal ions to rhamnolipid biosurfactant in the MEUF system and the mechanism via electrostatic attraction was suggested. The second study efficiently evaluated binding behavior of the four heavy metal ions individually and collectively onto the rhamnolipid. The order was Cu 2+ > Cd 2+ > Zn 2+ > Ni 2+ .The third study analyzed the equilibrium data using Langmuir, Freundlich, and linear adsorption models. The Freundlich model fitted the data better and the K F values were from 1.3 to 6.1. In addition, solidification/stabilization (S/S) technology was successfully used to stabilize solid wastes contaminated with heavy metal. Furthermore, preliminary trials were performed to examine the recovery of the rhamnolipid from the retentates for possible reuse. The amounts recovered ranged from 12 ± 1% to 18 ± 1% of the rhamnolipid concentration initially present in the retentate. Similarly, preliminary trials to reuse water from the retentates were investigated. The total portions recovered ranged from about 81.0 ± 0.34% to 82.3 ± 0.46$% of the total feed water. This work may be used as preliminary investigations for further detailed pilot and/or large-scale studies to treat contaminated groundwater and industrial wastewater