30 research outputs found

    Petrology, Geochemistry, Petrogenesis and Reactivation of Volcanic Tuffs at Dair El-Kahif Area, NE-Jordan

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    The volcanism in the western Arabian plate extends from the Red Sea through the Harrat Ash-shaam system to western Syria. The aforementioned volcanic activity produced large quantities of alkali olivine basalts and tuffaceous materials. The stratovolcano (7km) NE of Dair El-Kahif, NE Jordan has been investigated. The results show that dominant mineral phases are olivine, augite, plagioclase, magnetite and ilmenite. Chemical analysis of the whole rock tuff samples confirms alkali olivine magma origin. Low concentrations of Li and Rb in tuff samples are used as an argument against the contamination of the basaltic magma during its journey to the surface. The MgO and Mg-values (Mg/Mg+Fe²+) in samples from volcanic tuff exhibit different degrees of fractionation, which are indicated by the varying concentrations of incompatible trace elements (Ba, Rb, Sr). The thermometric evaluation of tuff determined by using pyroxene thermometers revealed a temperature range between 1022-1083°C and a pressure of 5-10 kbars. The low Mg-ratio (Mg/Mg+Fe²+) is due to fractional crystallization of olivine and pyroxene in tuff samples. The variations of incompatible elements imply derivation from a peridotite source in the upper mantle with low degree of melting (<20%). The volcanic activity took place in phases corresponding to rifting associated with the sinistral movement along the Dead Sea Transform and the later reactivation processes

    To the question about human typological aspects theoretical and applied significance on the basis of literary and own data

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    The most important human typological aspects are assessed under physiological and pathological conditions, in theoretical and applied disciplines, in the Earth various areas. Age typological aspect actuality is described by the fact that students represent separate age category, diseases age peculiarities for instance developmental dyscalculia in children; ethno-gender-age - in the work about Iranian boys with autism (R. Nasiri et al., 2017). Health control locus was studied in Poland at heart failure, at thyroid diseases; internalizing symptoms and disorders - with ethno-age aspect in Australian adolescents. Externalizing and internalizing problems in boys and girls pre-adolescents were different in both genders but there was a correlation between temperament type and psychopathology in Netherlands. Iranian scientists devoted their works to internalizing (M. A. Fallahnejad et al., 2017) and externalizing (S. Azimifar et al., 2018) behavior in primary school children. There is association between temperament type with extra- and intaversion and health problems in Iranian male and female students; temperament also can influence on coping with interparental conflicts; there are temperament specific classifications in Persian medicine: brain temperament (H. Salmannegad et al., 2016), of warmth and humidity (Gh. R. Mohammadi Farsani et al., 2017). Genes of left-handedness are absent in Dutch population. British biologists assessed links between cerebral lateralization and developmental language disorder in children (A. C. Wilson et al., 2018). Scientists are still not sure about apraxy dominance either in lefties or dextrals. Norwegian scientists found the dependence between autism and lefthandedness and ambidextrism (A. L. Rysstad et al., 2018)

    Exact methods for the quay crane scheduling problem when tasks are modeled at the single container level

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    The scheduling of quay cranes (QCs) to minimize the handling time of a berthed vessel is one of the most important operations in container terminals as it impacts the terminal's overall productivity. In this paper, we propose two exact methods to solve the quay crane scheduling problem (QCSP) where a task is defined as handling a single container and subject to different technical constraints including QCs? safety margin, non-crossing, initial position, and nonzero traveling time. The first method is based on two versions of a compact mixed-integer programming formulation that can solve large problem instances using a general purpose solver. The second is a combination of some constraints of the proposed mathematical model and the binary search algorithm to reduce the CPU time, and solve more efficiently large-sized problems. Unlike existing studies, the computational study demonstrates that both methods can reach optimal solutions for large-sized instances and validates their dominance compared to an exact model proposed in the literature which finds solutions only for small problems.This research was made possible by NPRP grant no. NPRP 7-796-2-297 from the Qatar National Research Fund (a member of The Qatar Foundation). The statements made herein are solely the responsibility of the authors. Appendix AScopu

    Sequence-Based Simulation Optimization: An Application to Container Terminals

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    This paper presents a novel method for simulation-optimization that incorporates the sequence in which the decision variables (resource levels) are optimized. The authors hypothesize that implementing such a sequence will reach a comparable solution in less computation time than the traditional method of optimizing simulations. Since container terminals are complex stochastic systems as they consist of different areas, each with detailed and critical functions that may affect the output, this method is applied and tested on a container terminal simulation model. This approach is anticipated to reduce the search space and improve the efficiency of the optimization process.This research was made possible by NPRP Grant No. NPRP 7-796-2-297 from the Qatar National Research Fund (a member of The Qatar Foundation). The statements made herein are solely the responsibility of the authors.Scopu

    Towards Extended Gate Field Effect Transistor-Based Radiation Sensors: Impact of Thicknesses and Radiation Doses on Al-Doped Zinc Oxide Sensitivity

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    Radiation measurements are critical in radioanalytical, nuclear chemistry, and biomedical physics. Continuous advancement in developing economical, sensitive, and compact devices designed to detect and measure radiation has increased its capability in many applications. In this work, we presented and investigated the performance of a cost-effective X-ray radiation detector based on the extended gate field effect transistors (EGFET). We examined the sensitivity of Al-doped Zinc oxide (AZO) of varying thicknesses, fabricated by chemical bath deposition (CBD), following X-ray irradiation with low and high doses. EGFETs were used to connect samples for their detection capabilities. As a function of the absorbed dose, the response was analyzed based on the threshold voltage shift, and the sensitivity of each device was also evaluated. We demonstrated that thin films are less sensitive to radiation than their disk-type EG devices. However, performance aspects of the devices, such as radiation exposure sensitivity and active dosage region, were found to be significantly reliant on the composition and thickness of the materials used. These structures may be a cost-effective alternative for real-time, room-temperature radiation detectors
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