This study provides sedimentological, geochemical, and sequence stratigraphic analyses of a Lower Cretaceous sedimentary section in Wadi Rahabah, Ras Al-Khaimah. Outcrop analogues for the Kharaib and Shuaiba formations in Wadi Rahabah assist in studying reservoir continuity and distribution in Abu Dhabi subsurface as well as improving and revising sequence stratigraphic and facies models. New data were acquired from geochemical methods to understand the formation, evolution, and chronostratigraphy of reservoir facies. The outcrops in Wadi Rahabah expose a carbonate platform setting. The depositional environment ranges from brackish lagoon to middle ramp. The carbon isotope values fall in the Barremian-Aptian range and show a strong correlation with the Cismon core (northern Italy). Two sequence boundaries were interpreted: The Lekhwair-Kharaib boundary and the Barremian-Aptian boundary. The Hawar litho-stratigraphical unit is not developed in Wadi Rahabah and its time-equivalent is a very thin, high energy grainstone unit.
The Ferrar Large Igneous Province is thought to have been emplaced around ~182 Ma forming a linear belt for 3500 km, covering highly vegetated parts of Antarctica, Australia, and Tasmania. Bulk chemical analysis, petrographic analysis, and literature-based palaeobotanical collection were accomplished to study the influence of the Ferrar volcanism on these areas. Graphic illustration of the Central Transantarctic Mountains was constructed using all gathered information and obtained data to visualize the effect of the Ferrar Magmatism on these areas (Pre-, syn-, and post-Ferrar magmatism).
The deep subsurface structural geometries of the frontal fold belt of UAE-Oman Mountains and foreland basin are not well understood. Accordingly, the present study used seismic sections and well logs aiming at outlining the different stratigraphic units and their structural setting. The study was initiated by tying the wells to seismic, then interpreting the faults/horizons. The study area is dissected by thrust and backthrust faults. The main thrust fault has a fault-propagation fold, trending NW-SE. It dissects the whole succession. Rapid Cenozoic subsidence is noticed from east to west across the Khusub thrust and its southerly extension. Most of the subsidence is within the Fars Group, where it shows great thickness variation along the sides of the thrust, whereas the Pabdeh Group exhibits less subsidence. The Sumeini sheet is present across the north eastern edge of the area, whereas Hawasina nappe covers the eastern central and southern parts.
The Red Sea is the closest active analog to the rifting and rupturing of continental lithosphere and provides an ideal natural setting to study the continental-oceanic rift transition. Currently, the Egyptian margin is one of the most potential regions for hydrocarbon exploration. The presence of thick evaporites and halite strongly affects the quality of seismic sections and cause challenges for successful exploration. Hence, a greater knowledge of sediments distribution of the morpho-structural setting of the margin and evolution of the Egyptian margin is therefore necessary. Accordingly, the main aim of the current study is to interpret a 3D seismic survey in order to analyse the tectonic evolution of the Red Sea, construct thicknesses and depth maps of the sedimentary units. Picking and interpolation the base of evaporites will allow to recognize any possible closures favorable to the hydrocarbons accumulation and to predict the location of pre-rift reservoirs below the salt.
Australia, in addition to South America, South Africa, and Antarctica, was impacted by the Karoo-Ferrar Large Igneous Province (LIP), a massive volcanic event that occurred ~182 millions years ago (Myrs). This event led to major environmental changes and out gassed copious amounts of CO2 similar to climate-change-driven increases today. Cores from Tasmania, Australia (Bicheno 3A and Bicheno 4) provide a window to the past and have the potential to examine the influence(s) of the Karoo-Ferrar LIP event by using sedimentological, mineralogical, and other special feature analyses. These cores span from 298.9 to 145 Myrs and include the Permian, Triassic, and Jurassic sections. Bicheno cores are important as they contain various deposits that can reveal the evolution of the regional paleoenvironment and a better understanding of the time and space constraints of the Karoo-Ferrar LIP event globally and its associated perturbations to life and their associated environments and ecological niches.
Upper Jurassic outcrops in Wadi Haqil in the northern Emirate of Ras Al Khaimah offer a continuous sedimentological record of carbonate rocks in contrast with time equivalent sequences from the Emirate of Abu Dhabi characterized by intercalations of carbonates and evaporites. Belonging to the Musandam Formation, these outcrops have a huge potential for high impact paleoenvironmental studies during key Mesozoic intervals such as the not so well defined J-K boundary. This paper summarizes the sedimentology of an Upper Jurassic-Lower Cretaceous carbonate rock sequence at high resolution coupled with X-Ray fluorescence elemental analysis in order to accurately understand the temporal evolution of the local sedimentary system and the changes in the environmental conditions of deposition based on evidences of rise and falls in sea levels and the rock's siliciclastic influx.
In this paper a wireless charging drone was built and designed its charging pad for use in farming. The system will be designed to monitor the palms on the farm and record data on the crops yields and health by using photography or other sensors. The main aim of the system is to maximize crop yields and achieve the sustainable development goals (SDGs). Furthermore, the charging pads will be deployed throughout the farm in order for the drone to land whenever required to charge the battery during flight missions in order to increase their monitoring capabilities. Inductive coupling wireless charging is used for the transmitter and receiver of the circuit where the receiver coil is connected to the drone and the transmitter coil is attached to the pad, which receives power from an energy source.
Appropriate design of grounding of electrical power systems plays a crucial role in the protection of human life and electrical installations. One of the important aspects for grounding design is proper measurement of the impedance of the ground electrode system. The soil parameters, including electrical conductivity and permittivity exhibit a non-linear dependance on frequency. A single salt Na2SO4 electrolyte was used to emulate soil as conduction in soil predominantly occurs in multi-electrolyte. The complex impedance for two-terminal measurement consists of "bulk" (sample under the test) and electrode-electrolyte interface (EEI) impedances. Two-terminal electrochemical impedance spectroscopy measurements are conducted for the frequency range between 10 mHz to 2 MHz using Na2SO4 solutions with concentrations of 0.01 mM and 0.05 mM using stainless steel electrode. The circuit model of the electrolyte with EEI behavior is presented for a given frequency range. The circuit model shows a good agreement with measured impedance data.
In this paper, control strategies of multi-terminal high voltage dc transmission systems are compared focusing on their transient performance. After developing the small-signal model of the systems, the eigenvalue analysis method is used for comparison. Different operating conditions and parameter sizes are considered in the study. It is found that dc voltage droop control has a more stable operation than the master-slave control strategy over a wide range of operations.
Terahertz rectification has been a heavily investigated subject due to its utility in communication and energy harvesting potential. MIM diodes have been at the frontier terahertz rectification. As more and more materials are investigated to enhance MIM diodes performance, the unique electrical properties of carbon nanotubes coupled with its size makes it a possible candidate for micro and nanoscale devices such as MIM diodes. In this paper, the diode-like properties of single walled carbon nanotubes atop a metallic substrate with a thin native oxide layer in between are reported.
