Now showing items 655-674 of 2240
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Neutron Diffraction and Mossbauer Effect Study of a Cobalt Substituted Zinc Ferrite
( Qatar University , 1982 , Article)The mixed cubic ferrite Zno.g5 €00.15 Fez 04 is studied by neutron diffraction and Mossbauer effect techniques at the temperature range 4.2 - 293 °K. The obtained spectra by both methods at low temperature show a long range ... -
Neutron Diffraction And Mossbauer Effect Study On A Mixed Rare Earth Garnet
( Qatar University , 1983 , Article)A powder sample of Y^YbFesO,; was prepared using the ceramic technique. X-ray diffraction pattern showed a single phase of the garnet type structure with a lattice constant 12.323 A". Specific heat for this composition was ... -
New Algorithms For Digital Analysis Of Power Intensity Of Non Stationary Signals
( Qatar University , 1998 , Article)Discrete and continues time-frequency algorithms of the power intensity of non-stationary signals are proposed. Results show that the power intensity waveform analysis performed well in both discrete and continuous ... -
New Contributions To The Geology, Geochemistry And Tectonic Setting Of The Aswan Granites, Southern Egypt
( Qatar University , 1990 , Article)The Aswan granitic rocks occupy a region in southern Egypt between the stable Archaean craton of the south Western Desert and the less stable Pan-African belt of the south Eastern Desert. They include light-grey medium ... -
New evaluation of a forgotten American woman writer
( Qatar University , 1998 , Article)Caroline Lee Hentz was a best-selling author. All of her books enjoyed a wide popularity, 100,000 copies being sold in a three year period over her life time. Furthermore, her books continued to sell following her death ... -
A New Liquid Membrane Electrode For Selective Determination Of Caffeine
( Qatar University , 1984 , Article)A new liquid membrane electrode for caffeine prepared from a solution of caffeine-picrylsulfonate ion-pair complex in n-octanol is developed. It exhibits Nernstian response in the range of 10'2 to lO^M caffeine with a ... -
New Potassium/Argon Ages For The Volcanic Rocks Of Halul Island (Qatar)
( Qatar University , 1988 , Article)The only rocks of igneous origin known to be exposed in Qatar are those of Halul and Shra'Auh Islands. They occur within a salt diapir and the age of these rocks is uncertain. They have generally been assigned to the Hormuz ... -
New Records Of Some Mammals From Qatar: Insectivora, Lagomorpha And Rodentia
( Qatar University , 1984 , Article)The present report deals with six native mammalian species to be recorded for the first time from Qatar. They belong to the following orders: Insectivora, Lagomorpha and Rodentia. None of these species is endemic to Qatar. -
New switching algorithm for combining new multi-step CG and self-scaling VM algorithms for non-linear optimization
( Qatar University , 1997 , Article)New interleaved CG and self-scaling VM algorithm is presented in this research which combines Al Bayati's self-scaling VM algorithm with another new multi-step CG algorithm with inexact line searches (ILS). In an interleaving ... -
A New Technique To Predict Multilayered Reservoir Characteristics Using Pulse Testing Data
( Qatar University , 1998 , Article)In this study, a mathematical model was developed to present pulse and interference testing for multilayered reservoirs. It was found that apparent storage calculated from pulse testing data is always less than or equal ... -
A New Tetrafluoroborate Liquid Membrane Electrode For Selective Determination Of Boron
( Qatar University , 1986 , Article)The construction and performance characteristics of a new liquid membrane electrode selective for BF^ion are herein described. The electrode incorporates nitron-tetrafluoroborate ion pair complex in nitrobenzene as a liquid ... -
A New Three Nodes Shell Element With Transverse Shear
( Qatar University , 2000 , Article)This paper proposes a new three node curved shell element. The approach used in the development of the new element is based on the Marguerre shallow shell theory which incorporates the effects of initial curvature (out-of ... -
Night and Early Morning Flying Insects in a Residence Backyard in Doha City, Qatar
( Qatar University , 2006 , Article)Night and early morning flying insects in Doha were recorded daily, for a complete year, using a light-water trap. Two peaks of insect numbers occurred in April-May and September-October periods respectively. The lowest ... -
Night Distribution Of Certain Species Of Coleoptera As Indicated By Captures In A Light Trap At Quena
( Qatar University , 1984 , Article)The night distribution of nineteen species over a whole trapping period can be considered under the following headings: a. Early flyers b. Species with two peaks of activity. The effect of light of low intensity, temperature ... -
Nitrogen fixation in polluted sea water of Alexandria coast, Egypt.
( Qatar University , 1990 , Article)The inshore area of the Mediterranean water, west of Alexandria, Egypt, is subjected to different types of pollutants. Nitrogen fixation rate was studied in this area in relation to some environmental factors such as pH, ... -
Nitrogen Transformations as affected by some factors at cultivated soils in Saudi Arabia
( Qatar University , 2001 , Article)The influence of serial concentration of salts (0.5, 1.0 and 1.5%), application of organic matter (0.5, 1.0 and 1.5% of wheat strat) and varying soil moisture content 50, 70 and 90%) on nitrification in sandy loam soil was ... -
Nitrogen Transformations As Affected By Some Factors at Cultivated Soils In Saudi Arabia
( Qatar University , 2000 , Article)The influence of serial concentration of salts (0.5, 1.0 and 1.5%), application of organic matter (0.5, 1.0 and 1.5% of wheat straw) and varying soil moisture content (50, 70 and 90%) on nitrification in sandy loam soil ... -
Nomograms For Interpreting Gravity Anomalies Above A Finite Horizontal Cylinder
( Qatar University , 1985 , Article)The present study gives a new method for solving the inverse problem of the gravitational anomalies related to a finite horizontal cylinder, by the use of the downward continuation method. Master curves have been obtained ... -
Non Uniform Differential Amplitude Phase–Shift–Key (Dapsk) Modulation For Multimedia Multicast Wireless Communications With Punctured Convolutional Coding
( Qatar University , 2003 , Article)Simple closed–form expressions for the probability of error for nonuniform M–ary Differential Amplitude Phase–Shift–Key (DAPSK) signaling over an Additive White Gaussian Noise (AWGN) and Rayleigh fading channels are ... -
Nonlinear Adaptive Control Of A Permanent Magnet Stepper Motor
( Qatar University , 1994 , Article)This paper considers adaptive position control of a permanent magnet (PM) stepper motor using exact linearization via static state-feedback. Physical outputs are chosen in such a way that the resulting closed-loop system ...
