March 23 ~ 24, 2024, Sydney, Australia
João Júnior Baptista, Departmento de Geofísica, Universidade Agostinho Neto, Luanda, Angola
This work presents the results from electrical resistivity, seismic refraction and multi-channel analysis of surface waves techniques, measured on the Soyo road section. The study aimed to obtain data on the physical-mechanical properties of soils and rocks and to provide technical information that will allow the completion of that road section. The electrical resistivity model shows two electrical mediums, the first associated with sedimentary sequence of clay, silt, sandy, carbonated rocks, mixed with sloth and organic matter. The second medium is associated with clay, all them saturated with marine saltwater. Similarly, the seismic refraction model shows two seismic mediums, the first associated with unconsolidated and/or poorly compacted rocks and the second with consolidated rocks. Multi-channel analysis of surface waves model shows that the first medium is not homogeneous, composed by an intercalation of fragile and hard horizontal stratums, with shear wave seismic velocities values varying from 180 to 360 m/s, associated with soft and stiff soils. These homogeneous organic clays are vulnerable to potential failure or collapse under seismic loading, having more than 3 meters thickness, so, the site is defined as Class F. Due to its plastic nature, this matter has been responsible for the ruptures and landslides that occurred and for the sinking of the structures built on the site.
Soyo road section, Soil and rock characterization, Electrical resistivity, Seismic refraction, Multi-channel surface wave analysis.
Samir H. Helou Ph.D., P.E, An-Najah National University, Nablus - Palestine
Ubiquitous reinforced concrete water storage tanks are quite popular and widely used in Palestine as in elsewhere in the world; they form pivotal components in major bulk-water carrier systems. In essence, they form lifelines to many communities; the water storage concept is as old as civilization itself. Location and land availability often dictate the topology of the tank’s structure. They may be either shallow and stubby or deep yet slender or in between having an aspect ratio dictated by site conditions. In all cases adequate structural analysis is mandatory. Modern computer programs demand adequate numerical models and proper loading data. The purpose of the present discourse is to briefly present a general formulation of a three-dimensional hydrodynamic model with the intention of evaluating and comparing three different topologies and to conduct a parametric study to evaluate the impact of the aspect ratio of cylindrical rigid tanks on their general response. This includes, yet it is not limited, to a thorough presentation of the prescribed hydrodynamic pressure, indispensable for accurate evaluation of the induced forces on the tank’s shell. The loading part of the seismic analysis procedure forms the principal focus of the present study. The study targets three different geometries of vernacular upright rigid water storage cylindrical tanks built on grade. Such tanks are customarily comprised of a flat roof supported by inner columns. One criterion for the investigation is the magnitude of the base shear and the bending moment at the base knowing that the hydrostatic forces have little or no bearing on such forces. The magnitude of the hydrodynamic force contribution on the overall design in the three cases is numerically evaluated and compared. The present discourse is limited to the versatile ground-supported column-free structures. The narration highlights analysis and design procedures based on the current state of the art practice. However, reinforced concrete section design is beyond the stated objective.
Water Storage Tanks, Impulsive Pressure, Convective Pressure, Rigid Water Tanks, Hydrodynamic Forces.
Mr. Bader Al rougi, Professor and research assistant, Saudi Arabia
Seawater electrolysis requires a stable catalyst that is resistant to rust, corrosion, inactive for chlorine evolution and can withstand the harshest conditions under acidic seawater. The present project aims at solving the problem of the electrolyzer in the harshest conditions of acidic sea water to sustain the splitting at high rate with durable and long stability terms. to fabricate an active electrode with dual function for water oxidation and reduction. If a suitable modification for assembling of electrocatalyst of cheap modifier is applied in electrolysis of water, the water splitting efficiency will be enhanced. In addition, the modifier could be selected in such a way to inhibit the chlorine evolution. It is planned for the modifier to be fabricated from nickel and some other species as graphene, as a suitable modified underlying substrate, could achieve this purpose. Nickel will be prepared in innovative ways on suitable electrodes, where the composition of the medium used and the interfacial properties of the electrodes that will be modified can be controlled. The present research is expected to reach a direct increase in the efficiency of the water splitting device in seawater without prior removal of chlorine. It may reach several continuous hours without any decrease in the efficiency of the device. It will produce an electrocatalyst with a high immunity against chlorine poisoning of the electrode, and thus experimentally applicable. In addition, the resistant to corrosion of the modified electrode is expected to be enhanced.
Electric catalyst, electrolysis, electrodes, seawater, green hydrogen.
Elias Louka1, Loucas Papadakis2, George Georgiades3, Stylianos Yiatros4, Hamza Osman5, Jianping Xuan1, 1School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China, 2Department Mechanical Engineering, Frederick University, Nicosia, Cyprus, 3Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol, Cyprus, 4Department of Civil Engineering and Geomatics, Cyprus University of Technology, Limassol, Cyprus, 5School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
The effect of glass and Kevlar fiber volume fraction on the mechanical properties of epoxy composites, was investigated in this study. Different number of layers, total mass of the non-impregnated fibers and reinforcing materials were used to create the specimens. As a result of the different number of the layers, specimens with varying thickness and total composite mass were produced. Volume fraction was changed, depends on these parameters. Specimens of fiber glass and Kevlar were prepared using the vacuum banging method and epoxy resin as the matrix material. The mechanical behaviors of the specimens were tested under uniaxial tension and three-point bending. Specifically, the samples’ stiffness and strength, were examined. The aspects of varying layers, fiber properties, thickness of sample and mass of fibers and total composite, i.e. volume fraction was found to play an important role for the design of a composite with an optimized stiffness or strength-to-weight ratio.
Fiber glass, Kevlar, volume fraction, composite materials, epoxy resin.
Zokhirov Adkhamjon Rafiqovich, Assistant of General Surgery No.2, Tashkent Medical Academy, Tashkent city, Uzbekistan
Determination of biochemical processes, endogenous intoxication and histomorphological and planimetric indicators in purulent-necrotic lesions of the foot in an experimental way and in patients with purulent-necrotic processes in diabetes mellitus, the condition of the IL-1β, IL-2, IL-4, IL-6, IL-8, IL-10, TNF-α, and INF-γ system based on the dynamics of cytokine levels was studied. Complex surgical treatment of the drug Reomannisol corrects the balance of cytokines, allowing them to have an antioxidant effect on the cytokine system.
diabetic purulent-necrotic foot model, cytokine system, complex treatment, Reomannisol, Reosorbylact.