Showing papers by "University of Jordan published in 1983"
TL;DR: In this paper, the properties of multivariate variable structure systems in the sliding mode were studied using a geometric approach and they were proved using the projector the projection of the projection matrix.
Abstract: Multivariate variable structure systems in the sliding mode are studied using a geometric approach. The properties of system order reduction and disturbance rejection are proved using projector the...
256 citations
TL;DR: In this paper, U-Pb isotopic analyses on sized and magnetic zircon fractions, a monazite and an apatite sample and by Rb-Sr isotopic studies on whole-rocks and minerals of metasedimentary rocks, granodiorites, granites and dykes have elucidated the following events.
54 citations
TL;DR: In this paper, two "oil shale" samples from the Uppermost Cretaceous to the Paleocene were investigated and major elements, organic matter and trace elements, together with aspects of mineralogy and petrography were determined.
Abstract: Twenty-two "oil shale" samples from north Jordan have been investigated. They are in fact all bituminous limestones, of ages ranging from Uppermost Cretaceous to Paleocene. Major elements, organic matter and trace elements, were determined, together with aspects of mineralogy and petrography. Although macrofossils are rare, trace fossils were encountered. These rocks are postulated to be normal limestones deposited in an oxygenated shallow marine environment. The H2S/O2 interface coincided or lay just below the water/sediment interface. The organic matter is indigenous and not related to migrating oil.
51 citations
TL;DR: Fire burns were the commonest type, and most of the burn injuries occurred at home, and children below the age of five years were the most frequently affected among burn injury victims.
27 citations
TL;DR: In both groups, normotension and hypertension, the ophthalmic blood pressure was found to be dependent from the level of the systemic blood pressure and the position of patient, and it is significantly higher in the supine position than in the sitting position.
Abstract: Ophthalmodynamometry was done by 96 normotensive volunteers and 62 hypertensive patients in sitting and supine position. A high correlation between the brachial and ophthalmic blood pressure was found in both groups, and in both positions. The brachial blood pressure of normotensive subjects did not show any difference in both positions. Although the systolic brachial blood pressure did not show significant changes in hypertension, the diastolic--and the calculated mean brachial blood pressure has been slightly but significantly decreased in the supine position. In both groups, normotension and hypertension, the ophthalmic blood pressure was found to be dependent from the level of the systemic blood pressure and the position of patient. It is significantly higher in the supine position than in the sitting position. The higher the systemic blood pressure in the sitting position, the less was the increase of the ophthalmic blood pressure in the supine position.
27 citations
TL;DR: In this paper, two rapid methods for the decomposition and chemical analysis of clays were adapted for use with 20-40-mg size samples, typical amounts of ultrafine products (<0.5-μm diameter) obtained by modern separation methods for clay minerals.
Abstract: Two rapid methods for the decomposition and chemical analysis of clays were adapted for use with 20–40-mg size samples, typical amounts of ultrafine products (<0.5-μm diameter) obtained by modern separation methods for clay minerals. The results of these methods were compared with those of “classical” rock analyses. The two methods consisted of mixed lithium metaborate fusion and heated decomposition with HF in a closed vessel. The latter technique was modified to include subsequent evaporation with concentrated H2SO4 and re-solution in HCl, which reduced the interference of the fluoride ion in the determination of Al, Fe, Ca, Mg, Na, and K. Results from the two methods agree sufficiently well with those of the “classical” techniques to minimize error in the calculation of clay mineral structural formulae. Representative maximum variations, in atoms per unit formula of the smectite type based on 22 negative charges, are 0.09 for Si, 0.03 for Al, 0.015 for Fe, 0.07 for Mg, 0.03 for Na, and 0.01 for K.
25 citations
TL;DR: The ν 2 fundamental band of HNCO has been observed for the first time under a resolution of 0.015 cm −1 as discussed by the authors, and the band origin for this NCO antisymmetric stretching vibration is found to be at 2268.893 cm − 1, rather distant from the previously reported value of 2274 cm−1.
24 citations
TL;DR: In a case review over a nine-year period, 35 patients referred to the University Hospital with a variety of abdominal symptoms related to the gastrointestinal tract, were found to have diverticular disease of the colon.
Abstract: In a case review over a nine-year period, 35 patients were referred to the University Hospital with a variety of abdominal symptoms related to the gastrointestinal tract, were found to have diverticular disease of the colon. In a retrospective evaluation of 274 consecutive barium enemas performed at the same institute in patients aged 20 to 85 years, in a three-year period (1979 to 1981), colonic diverticula were found in 11 patients, giving incidence of 4 per cent; all positive enemas for diverticulosis in this group occurred in patients over the age of 40 years.
24 citations
TL;DR: Five cases of acute leukemia which developed in the course of pregnancy are reported and all five cases received combination therapy which included adriamycin.
22 citations
TL;DR: In this paper, the impedance behavior of some liquid ion-exchangers (for barium ion-selective electrode based on neutral carrier complexes, and for the Orion calcium, divalent, and chloride selective electrodes) incorporated in poly (vinyl chloride) matrix membranes are described.
19 citations
TL;DR: In this paper, a method has been investigated which allows calculations of the absorption correction factors in the energy range 1.0-5.0 keV using 55Fe excitation source.
Abstract: A method has been investigated which allows calculations of the absorption correction factors in the energy range 1.0–5.0 keV using 55Fe excitation source. From the experimentally-measured absorption factors between 6.0 and 20.0 keV using 109Cd excitation source, the coefficients at lower energies with the associated absorption jumps are generated through an iterative procedure.
TL;DR: Benign cystic teratomas were the most common ovarian tumors found, followed by mucinous cystadenomas, and all of the tumors were benign except one case of Burkitt's lymphoma.
TL;DR: In this paper, the authors reported a brief investigation of the thermally unstable products of the reaction of uranium tetrachloride with alkyl lithium reagents and further observations of eqn.
TL;DR: In this article, the reaction of some arylnitrile oxides with potassium thiocyanate in acetone at ambient temperature, has been investigated, and the structures of these new heterocycles are supported by elemental analyses and spectral data.
TL;DR: The physical, chemical and mineralogical characteristics of some soils in the Jordan Valley (Rift Valley) and the Highland (Irbid-region) were investigated in this article, where they found that the soils of the Highland contained more clay and smectite than those of the Jordan valley (Camborthids and Torriorthents).
TL;DR: It is concluded that VAP is effective therapy in AIL because the three patients who received vincristine, adriamycin and prednisolone went into remission early and are still in remission with a follow-up of 22–35 months.
Abstract: Five patients, three males and two females, with angioimmunoblastic lymphadenopathy (AIL) are described. The two who received steroids had no response and died 2 and 6 months later. The three patients who received vincristine, adriamycin and prednisolone (VAP) went into remission early and are still in remission with a follow-up of 22–35 months. It is concluded that VAP is effective therapy in AIL.
TL;DR: Sera of 985 Jordanians from 1 to 36 years of age and 115 cord blood specimens werescreened for rubella haemagglutination-inhibition antibodies showed the percentage of seropositivity increased with age, while 80–91% of the older group and 95% of Cord blood specimens were positive.
TL;DR: In this paper, a rough perfectly conducting sphere is considered and the wave scattering from a rough sphere is investigated using the reformulated current method in which the object is replaced by a current distribution radiating into an unbounded media.
Abstract: Wave scattering from a rough perfectly conducting sphere is considered. Use is made of the reformulated current method in which the object is replaced by a current distribution radiating into an unbounded media. The scattered field components are obtained in terms of the joint characteristic function defining the roughness.
TL;DR: Seventy-five patients with ectopic pregnancy were treated at Jordan University Hospital during a 7-yr period from January 1976 to December 1982, with the most common symptoms being abdominal pain and amenorrhea.
TL;DR: In this paper, a method for measuring the surface density of pure element thin films using x-ray fluorescence and coherent scattering of primary radiation has been developed, which is greatly improved by intensity ratio measurements where the dependence on the accuracy of the fundamental parameters is eliminated.
Abstract: A method for measuring the surface density of pure element thin films using x-ray fluorescence and coherent scattering of primary radiation has been developed. The accuracy is greatly improved by intensity ratio measurements where the dependence on the accuracy of the fundamental parameters is eliminated.
TL;DR: A survey was conducted during the period 1979–1982 to identify viruses affecting tomatoes in the Jordan Valley, and results indicated the rare occurrence of mosaic diseases caused by tobacco mosaic virus, cucumber mosaicirus, or potato virus Y.
Abstract: A survey was conducted during the period 1979–1982 to identify viruses affecting tomatoes in the Jordan Valley. Results indicated the rare occurrence of mosaic diseases caused by tobacco mosaic virus, cucumber mosaic virus, or potato virus Y. However, tomato yellow leaf curl virus was predominant.
TL;DR: An accelerator-based elemental study, using proton-induced x-ray emission (PIXE), was performed on four full-cream and four half-cream brands of powdered milk commonly consumed in Jordan as mentioned in this paper.
Abstract: An accelerator-based elemental study, using proton-induced x-ray emission (PIXE), was performed on four full-cream and four half-cream brands of powdered milk commonly consumed in Jordan. The elements detected in the samples are S, Cl, K, Ca, Fe, Cu, Zn, Br, and Rb. The significance of some of these elements is discussed from the viewpoint of nutrition and also their effect on milk processing and dairy technology. The standard reference milk sample, A-11, which is distributed by IAEA was also examined, and the results for trace elements detected are compared with the values certified by IAEA.
TL;DR: In this paper, the second order leapfrog method is used to discretize the linearized KdV equation, which is itself a dispersive partial differential equation, and the resulting difference equation is solved and analyzed in terms of its dispersion relation and propagation properties.
TL;DR: In this paper, the density fluctuations induced by 4He impurities in a thin film of normal liquid 3He, as well as by the presence of a boundary, are studied and analytic expressions for the response of the system to these fluctuations are derived.
Abstract: The density fluctuations induced by4He impurities in a thin film of normal liquid3He, as well as by the presence of a boundary, are studied. Analytic expressions for the (linear) response of the system to these fluctuations are derived and the basic features of the effective interaction between two4He impurities in the3He bath are outlined. Some experimental implications and possible extensions are discussed.
TL;DR: The question of doing electromyographic studies of the pelvic muscles prior to the repair of the anomaly, together with the timing of the latter, is raised.