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Now showing items 21-40 of 12186
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Homogeneous Catalysis of O-Silylation Reactions Using Tris (Acetylacetonato) Cobalt (III)
(1986)Tris (acetylacetonato) cobalt (III), (Co(acac)3), has been used to catalyze o-silylation reactions of R 3 Siff (R.z.Et,Et0) with R OH (Rt-Et, i-Pr, t-.Bu and C6Hj-). No reaction has been observed at room temperature, but ... -
Photon Shadowing in Nuclei
(1986)Photonuclear Shadowing is studied using the Glauber - generalized vector meson dominance approach. The calculation is performed using both diagonal and off - diagonal generalized vector dominance (GVMD) models. The results ... -
Study of Changes in the Ground Water in Gaza Strip during the Last Twenty Years
(1986)The inhabitants of the Gaza Strip depend heavily on underground resources for their water supplies. This is due, partly, to the scarcity of rain falls in that region and, also, to the limited number (three) of streams and ... -
M.R.H. A New Era in Magnetic Head Design
(1986)The conventional method for reading/writing information from/on a magnetic media (e.g. magnetic tapes in audio and video recorders, computers etc.) uses what is called an inductive head. This consists of several turns of ... -
ملفات واوراق بلدية نابلس 1918 - 1948
(جامعة النجاح الوطنية, 1986) -
The Development of Rotylenchulus Reniformis and Tylenchulus Semipenetrans, on Grape Roots
(1987)The results showed that the average numbers of eggs per an egg mass of R. Reniformis and T. Semipenetrans were 84 and 36 eggs, and the eggs hatched after 6 and 7 days respectively. The durations of the life cycle were 30 ... -
Kinetic Study of the Complexation of Palladium (II) With 2-(5-Bromo-2-Pyridylazo)-5-Diethylaminophenol
(1987)The kinetics of the complexation reaction of palladium with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) has been studied in the stability time at the optimum pH of 3.53 in presence of 50% ethanol. The effect ... -
Spectrophotometric Studies and Analytical Application of Cerium (III) and Thorium (IV) Chelates with Pyridine-2-Aldehyde-2-Pyridylhydrazone (PAPH)
(1987)Ce (III) and Th (IV) reacts with pyridine-2—aldehyde-2—pyridylhydrazone in aqueous solutions containing 50 % ethanol at pH's 7.75 and 8.45 respectively. Beer's law is obeyed over the range 0.0-15.p.g and 0.0-18 ktg of ... -
Base Cleavage of Some Benzyl-Silicon and Tin Compounds in H2O-MeOH-Cyclodextrin Medium
(1987)The effects of oc - and f3- cyclodextrin (x - ,13- CD's) on the rates of base cleavage of 4 - CNC6 H4 SnMe3 ,3—CIC6 H4 CH2 MMe3 , 4 C1C6 H4 CH2— MMe3 and 3,5 - CL2 C6 H3 CH2 MMe3 with M = Si and Sn have been examined in H ... -
Pyridylazo Compounds As Analytical Reagents: A Review
(1987)A large number of 2-pyridylazo compounds have been proposed as reagents for the spectrophotometric determination of several metal ions. The application of 2-pyridylazo compounds for the determination of many metal ions is ... -
The Susceptibility of Twelve Grape Cultivars to Meloidogyne Incognita Acrita, Rotylenchulus Reniformis and Tylenchulus Semipenetrans
(1987)In this study the susceptibility of 5 American cultivars (Delight, Fiesta, Freedom, Harmony and Ruby), 3 Egyptian cultivars (Baladi, Bez-Alanza, and Fayumi) and 4 Palestinian cultivars (Al-Zeiny, Black-Zeiny, Beitony and ... -
Pollution Levels of Drinking Water in Nablus
(1987)Metal concentrations in drinking water used in Nablus have been studied. Samples from houses located in various districts of Nablus have been collected between Dec. 22, 1985, and Jan. 19, 1986, acidified and then analyzed ... -
Distribution of ABO Blood Groups and the Rh factor in Palestinians Living in the Northern Part of the West Bank
(1988)The ABO blood groups and the Rh factor were determined for 1308 Palestinian subjects living in the northern part of the West Bank, using Anti-A, Anti-B, and Anti-D sera. Group 0 was the most frequent blood group in these ... -
A Detailed and Simplified Solution to Hydrodynamic Forces on a Submerged Tank Subject to Lateral Ground Excitation
(1988)The domain where a submerged vertical cylindrical tank exists is divided into two regions. Assuming irrational motion and an ideal fluid the Laplace s equations in both regions are solved by the method of separation of ... -
Explanation of the Shape of Calibration Graphs Obtained for Mercury, Zinc and Copper in Stream Water Samples
(1988)Calibration graphs have been obtained for mercury, zinc and copper ions using buffered (pH 7.4) stream water and centrifuged stream water samples. Two hypothesis explaining the shape of the obtained calibration graphs have ... -
The Role of Solvent on the Kinetics and Mechanism of the Hydrolysis of Salicylidene Benzoyl Hydrazone
(1988)The effect of various solvents on the kinetics and mechanism of the hydrolysis of Salicylidene Benzoyl hydrazone (SBH) has been studied at five different temperatures (17-45 C) using U.V. and visible spectrophotometry. In ... -
Pollution Levels of Drinking Water in Several Villages in Nablus Area and in the City of Hebron
(1988)Samples of drinking water were collected from several villages in Nablus area, and from the city of Hebron. The concentrations of lead, copper, nickel, manganese, iron, zinc, magnesium and calcium were determined in these ... -
The Use of Transition-Metal Complexes as Catalysts in Tertiary Silanes Reactions with Unsaturated Organic Compounds and Alcohol: A Review
(1988)This review deals with reactions of tertiary silanes R3SiH with unsaturated organic compounds (e.g. alkanes, dienes, alkynes, ketones, and aldehydes) and with alcohols R'OH, using transition- metal complexes as catalysts. ... -
Free Odd Periodic Actions on the Solid Klein Bottle
(1989)The cyclic actions of odd period and empty fixed point set are studied on the solid Klein Bottle K. It is shown that up to weak equivalence there is only one such action.