Showing papers by "University of Jordan published in 1987"
TL;DR: The interpretation of a deep seismic refraction study in Jordan, performed in May 1984, shows that much of the country is underlain by continental crust, 32-35 km thick, and normal mantle with a velocity of 8.0-8.2 km/s as discussed by the authors.
137 citations
TL;DR: In this paper, a detailed survey of management development in Jordan is presented, and the conclusions provide a checklist of priority considerations in the formulation of a future strategy, based on the serious shortage of managers and the cultural factors influencing behavior in organizations in Arab countries.
Abstract: The author reviews the serious shortage of managers and the cultural factors influencing behaviour in organisations in Arab countries. A detailed survey of management development in Jordan is presented, and the conclusions provide a checklist of priority considerations in the formulation of a future strategy.
95 citations
TL;DR: It appears that in patients with late‐stage chronic liver disease, severe histological activity subsides, and survival is no longer influenced by the factor of hepatitis D viral infection, and the course of those antihepatitis D virus‐positive patients surviving beyond this stage is complicated.
52 citations
51 citations
TL;DR: In this article, the average wind speed for the two most potential sites Ras Muneef (RA) and Mafraq (MF) ranged from 3.0 to 7.4 m/sec and the average power density for these two sites ranged from 110 to 370 W/m2 at RA and from 105 to 470 W/M2 at MF.
48 citations
TL;DR: The findings of this study should alert the authorities to the need for the establishment of a maxillofacial unit in every city, as major problems concerning the identification and management of such cases still exist in developing countries like Jordan.
45 citations
TL;DR: In this article, the authors combined analysis of P-and S-wave data from seismic refraction lines in Jordan has led to the derivation of a Poisson's ratio model for the crust.
Abstract: Summary. Combined analysis of P- and S-wave data from seismic refraction lines in Jordan has led to the derivation of a Poisson’s ratio model for the crust. This model shows that the upper crust, including the sediments, has an average Poisson’s ratio of around 0.25, except beneath NW Jordan where the sediments have a high ratio of around 0.32. However, the lower crust below about 20 km depth has high Poisson’s ratios ranging from 0.29 to 0.32. These high Poisson’s ratios may be interpreted mineralogically in terms of high feldspar and low quartz content in the rocks (e.g. gneiss, amphibolite) of the lower crust or fluid phases in the form of separated penny-shaped inclusions.
43 citations
TL;DR: In this article, the Kα x-ray fluorescence (XRF) cross sections have been experimentally determined for elements in the range 42≦Z≦57 at excitation energy of 59.54keV associated with gamma rays of Am-241 radioisotope.
Abstract: TheKα x-ray fluorescence (XRF) cross sections have been experimentally determined for elements in the range 42≦Z≦57 at excitation energy of 59.54keV associated with gamma rays of Am-241 radioisotope. In addition, measurements of XRF yields of theK shell (wk) for the same elements at the same excitation energy have also been carried out. Our measurements were shown to agree with theoretical calculations.
35 citations
TL;DR: In this article, the authors proposed coupling measures between modes and state variables to select an easily measurable signal, which is the line current, to feed back through the excitation loop to stabilize a single-machine system with subsynchronous resonance.
28 citations
TL;DR: A new phthalideisoqunoline, fumadensine, has been isolated from extracts of Fumaria densiflora and it is shown that this compound acts as a ‘spatially aggregating agent’ to form phthalidonic acid.
24 citations
01 Jan 1987
TL;DR: Volterra series expansions are used in establishing appropriate high-frequency models for the description of such wide-band CATV channels to illustrate the development of Volterra models which may be used subsequently in the prediction of intermodulation distortion in such systems.
Abstract: This correspondence deals with the development of a practical approach for the assessment of intermodulation distortion in modern cable television (CATV) systems operating over the 400 MHz range. In particular, Volterra series expansions are used in establishing appropriate high-frequency models for the description of such wide-band CATV channels. Furthermore, experimental measurements made on a typical system are utilized to illustrate the development of Volterra models which may be used subsequently in the prediction of intermodulation distortion in such systems.
TL;DR: In this article, the dependence of the electrical resistivity of Celion polyacrylonitrile-based carbon fibres on test temperature is characterized by a two-stage electrical conduction process and a semiconductor type of behaviour with a low activation energy.
TL;DR: In this paper, the ignition temperature in the air atmosphere at the separating line between an explosion and no explosion in a dust cloud was investigated for mixtures of fine and coarse dusts of the same material.
01 Jan 1987
TL;DR: It is suggested that cerebral lupus should be considered in the differential diagnosis of catatonia even in the absence of radiological and focal neurological signs when the active disease is present.
Abstract: A 19-year old female with catatonia associated with multi-system involvement with systemic lupus erythematosus is described. There was no evidence of CNS involvement (negative CT scan, normal EEG, normal ice-caloric response, and normal CSF findings). The patient improved on large doses of steroids. It is suggested that cerebral lupus should be considered in the differential diagnosis of catatonia even in the absence of radiological and focal neurological signs when the active disease is present.
TL;DR: In this article, the measured values of the sound pressure level (L10) resulting from traffic noise measurements over periods of 1 h and 18 h were given in the greater Amman (Jordan) area.
TL;DR: The study showed three generations of the olive fruit fly from June to November 1984, where the highest number of larvae was found in Ascolano, Santa and Rase’e varieties and the most abundant parasites were O. concolor and Tetrastichus sp.
Abstract: The study showed three generations of the olive fruit fly from June to November 1984. Eggs were first detected in the Shami variety in early June. There were three peaks of eggs found in almost all varieties in late June, late August and late October. Highest number of larvae was found in Santa in July, and Ascolano and Kheli in August. There were no significant differences in the number of larvae per 100 infested fruits between all varieties during the first generation except Nabali. Pupae inside the fruits first appeared in Shami in July. The number of pupae inside the fruits was high in all varieties in August. Holes made by larvae falling to the soil for pupation were recorded in early August in all varieties, except Nabali where they appeared in late August and early September. During the second generation the highest number of larvae was found in Ascolano, Santa and Rase’e varieties. The recorded parasites were Opius concolor, Eupolmus urozonus, Tetrastichus sp., Trichostereresis glabra, and Lasioglassum sp. The most abundant parasites were O. concolor and Tetrastichus sp.
TL;DR: In this article, a preheater and precalciner were investigated with respect to thermal energy consumption, losses and the potential of heat saving in a cement production line, and it was shown that 2% fuel saving can be achieved with highly viable payback times ranging from 0.07 to 0.72 yr.
Abstract: The cement industry is an energy intensive industry. Energy prices necessitate energy efficient systems, i.e. deep consideration of energy conservation and waste-heat recovery must be made. In the present work, a cement industry was examined with respect to thermal energy consumption, losses and the potential of heat saving. The production line investigated involved a cyclone preheater and precalciner prior to the kiln. In carrying out the work, data were obtained from the control room and by direct measurements on the different units. The thermal energy analysis of the system revealed that a considerable amount of fuel heat is dissipated. For recovering the waste heat, it has been proposed to insulate the external surface of the cyclones and ducts in the preheater unit. The optimization study on the insulations indicated that a 2% fuel saving can be achieved with highly viable payback times ranging from 0.07 to 0.72 yr.
TL;DR: In this article, the authors describe the design, manufacture and performance of a new type of solar distillation unit, which operates at a pressure below the atmospheric and utilizes a flat-plate collector.
Abstract: This paper describes the design, manufacture and performance of a new type of solar distillation unit. The unit operates at a pressure below the atmospheric and utilizes a flat-plate collector. The designed unit is intended for an experimental purpose and operates on draw and fill or non-flow basis. The unit can provide distilled water from any available brackish or saline water. The experimental data obtained from this investigation revealed that the maximum daily productivity of the unit was 5,4kg/(m2/day) and the maximum daily efficiency was 59%.
TL;DR: A series of new N-(2-benzimidazol)(S)-α-aminoesters and the respective N-oxides have been prepared, and their spectral data discussed.
03 Apr 1987-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: The 19 F(p, α 0 ) 16 O nuclear reaction seems to be an excellent method for high resolution fluorine depth profiling as mentioned in this paper, and the detection of the outcoming alpha particles was done with and without Kapton foils.
Abstract: The 19 F(p, α 0 ) 16 O nuclear reaction seems to be an excellent method for high resolution fluorine depth profiling. Target tilting, a pulse pileup rejection circuit and a high resolution solid state detector were employed. Magnesium fluoride, calcium fluoride and fluorohydrocarbon targets of different thickness were used. The detection of the outcoming alpha particles was done with and without Kapton foils. A depth profile resolution of 10 nm was obtained and 3 nm appears to be feasible.
TL;DR: A 3-day-old male infant born to a non-diabetic mother was admitted to the University Hospital with gangrene of the right forearm and some gangrenous patches of the left forearm.
Abstract: A 3-day-old male infant born to a non-diabetic mother was admitted to the University Hospital with gangrene of the right forearm and some gangrenous patches of the left forearm. This was associated with left renal vein thrombosis. Screening tests for coagulation disorders gave normal results. The gangrenous right forearm was amputated and subsequently grafted. The skin lesions of the left forearm were successfully grafted. The renal system recovered well on supportive measures. The course of hospitalization and subsequent follow-up assessment at 3 months of age were satisfactory.
TL;DR: The faster dissolution rate of Oramide formulation has rendered it bioequivalent to Daonil which contains a higher amount of active ingredient.
01 Nov 1987
TL;DR: In this paper, a new method of analysis of thyristor voltage-controlled RL loads is described, based upon power considerations, and the use of the triangulation angle as the independent variable is shown to yield the most direct and efficient computation of performance.
Abstract: A new method of analysis of thyristor voltage-controlled RL loads is described, based upon power considerations. Use of the thyristor conduction angle as the independent variable is shown to yield the most direct and efficient computation of performance. Purely resistive and inductive loads are covered as special cases. The 3-phase circuit with antiparallel thyristors is considered in detail as an example and its general characteristics are given.
Journal Article•
TL;DR: GSH levels and the activities of GST and GSR in human erythrocytes and lymphocytes in males and females in three age groups were determined and both GST andGSR activities were found to be higher in lymphocytes than in ery Throcytes.
Abstract: We review the role of glutathione (GSH) and its metabolizing enzymes, glutathione S-transferase (GST) and glutathione reductase (GSR) in drug metabolism and in the elimination of foreign compounds. Levels of GSH and the activity of these enzymes may be greatly influenced by drugs and other substances in the body. We therefore determined GSH levels and the activities of GST and GSR in human erythrocytes and lymphocytes in males and females in three age groups. There was no significant difference between males and females in the three age groups in respect of GSH levels and GST and GSR activities. GSH levels in erythrocytes were higher than those in lymphocytes when expressed per mg protein, but lower than those in lymphocytes when expressed per 10(6) cells. The activities of both GST and GSR were found to be higher in lymphocytes than in erythrocytes.
TL;DR: Ulastructural study of spermiogenesis in the chiton Acanthopleura haddoni (Mollusca, Polyplacophora) reveals that early spermatids have round to oval nuclei with granular chromatin material, and the nuclear envelope exhibits a posterior implantation fossa to which a basal plate is aligned.
Abstract: Summary Ultrastructural study of spermiogenesis in the chiton Acanthopleura haddoni (Mollusca, Polyplacophora) reveals that early spermatids have round to oval nuclei with granular chromatin. A few mitochondria, a Golgi body, two centrioles, and elements of endoplasmic reticulum are present. Middle spermatids have nuclei with filamentous chromatin material, and the nuclear envelope exhibits a posterior implantation fossa to which a basal plate is aligned. The proximal and distal centrioles are at right angles, and pericentriolar bodies are observed lateral to the proximal centriole. A primordium of the tail appears early in spermiogenesis. No proacrosomal vesicles were observed, and the Golgi body was always located posterior to the nucleus. In late spermatids, the nucleus is bullet-shaped, and chromatin is sheet-like. In fully developed spermatids, the nucleus is extremely dense, and has an anterior extension. No acrosome is present. Three mitochondria constitute a very short middle piece, and an eccentr...
01 Jan 1987-International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes
TL;DR: In this paper, photon-induced Kα1 and Kβ1 x-ray fluorescence cross-sections for these elements at this excitation energy are reported for the first time.
TL;DR: The residual chert beds of the Silicified Limestone Unit (Late Cretaceous) in Jordan are composed essentially of cristobalite, a metastable intermediate phase in the tripolization process as discussed by the authors.
TL;DR: In this paper, three methods for determination of dissolved oxygen in samples of natural water are compared; patentiometric stripping analysis, PSA compares well with oxygen selective electrodes, although the use of OSP has many disadvantages.
Abstract: Three methods for determination of dissolved oxygen in samples of natural water are compared; patentiometric stripping analysis, PSA compares well with oxygen selective electrodes. Although potentiometric stripping analysis and oxygen selective electrode methods are found to be simple, rapid and of higher reproducibility than the usual Dinkier procedure, the use of oxygen selective electrodes has many disadvantages.