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An-Najah Blogs :: en-usSun, 23 Feb 2020 01:27:08 ISTSun, 23 Feb 2020 01:27:08 ISTwebmaster@najah.eduwebmaster@najah.eduCritical behavior of the ultrasonic attenuation for the binary mixtures of benzene-coconut oil and hexane-beta, beta '-dichloroethyl etherhttp://blogs.najah.edu/staff/emp_2160/article/Critical-behavior-of-the-ultrasonic-attenuation-for-the-binary-mixtures-of-benzene-coconut-oil-and-hexane-beta-beta--dichloroethyl-etherPublished ArticlesUltrasonic absorption and velocity measurements were made as a function of temperature for the binary mixtures of benzene-coconut oil and hexane-beta beta-dichloroethyl ether Ultrasonic absorption at 5 7 10 15 2 1 and 25 MHz and above T-c is a analyzed by the dynamic scaling theory of Ferrell and Bhattacharjee FB The ultrasonic absorption of the two binary mixtures exhibit strong temperature and frequency dependence near T-c Ultrasonic velocity behaves as a linearly decreasing function of temperature above the critical temperature satisfying linear relation The observed of alphacf2 VS f-106 yields a straight line as predicted by FB theory Experimental values of alphaalphac for the two binary critical mixtures are compared to the scaling function FomegaEffects of Noise Pollution on Blood Pressure, Heart Rate and Hearing Threshold in School Childrenhttp://blogs.najah.edu/staff/emp_2160/article/Effects-of-Noise-Pollution-on-Blood-Pressure-Heart-Rate-and-Hearing-Threshold-in-School-ChildrenPublished ArticlesThis study reports the association of noise pollution level with blood pressure systolic and diastolic heart rate and hearing threshold in school children The schools were selected randomly as to present quiet [Seida village 682-711 dBA] noisy [Nablus city 765-794 dBA] and very noisy [Tulkarem refugees camp 824-859 dBA] localities Strong positive correlation Pearson Correlation Coefficient were found between noise pollution level and systolic and diastolic blood pressure heart rate and hearing threshold at different frequencies The mean systolic and diastolic blood pressure for the two sexes are correlated positively with the noise pollution level R = 0521 and 0440 respectively The hearing threshold levels of different frequencies correlated positively with the noise pollution level R = 0114 to 0267; where p c 005Two-Scale-Factor Universality of Binary Liquid Critical Mixtureshttp://blogs.najah.edu/staff/emp_2160/article/Two-Scale-Factor-Universality-of-Binary-Liquid-Critical-MixturesPublished ArticlesThe universal quantity of some binary liquid mixtures has been calculated using the results of recent experimental collateral data The values of for the systems are in good agreement with the other experimental and also with the theoretical values The obtained average value of = 02691 00028 supports the theoretical value of = v[n4]1din three dimensions for n = 1 and d = 3 which indicates that fluid and binary mixtures transition belong to the same class of universality \two-scale-factor universality\
Pakistan Journal of Applied Sciences 32: 142-144 2003
Noise pollution in factories in Nablus Cityhttp://blogs.najah.edu/staff/emp_2160/article/Noise-pollution-in-factories-in-Nablus-CityPublished ArticlesNoise pollution is becoming more and more important especially in the industrialized and developed countries Industrial noise is a serious environmental problem which causes annoyance and disruption to daily activities In the West Bank however there are so far no regulatory laws to limit high industrial noise levels Due to a general lack of awareness about the ill effects of high noise levels the owners of factories pay little attention to safety measures for their workers
Accordingly this study is concerned with measuring the equivalent noise levels L-eq in 38 factories in Nablus city and comparison with international standards of noise The obtained mean value of these levels is 855 dBA It has been found that the L-eq values for 40 of the selected factories are higher than the widely-adopted international standards These factories are considered by the workers to be noisy sources The continuous exposure of the workers to such high noise levels can cause hearing damage speech masking and annoyance High-level noise not only hinders communication between workers but depending upon the level quality and exposure duration of the noise it may also result in different types of physical physiological and psychological disorders This study makes some recommendations and gives advice for the workers in the factories owners of factories and for the Palestinian authorities to relieve the noise pollution problem in factories in Nablus CityConcentration and Temperature Dependence of Shear Viscosity of the Critical Mixture of Nitroethane and 3-Methylpentanehttp://blogs.najah.edu/staff/emp_2160/article/Concentration-and-Temperature-Dependence-of-Shear-Viscosity-of-the-Critical-Mixture-of-Nitroethane-and-3-MethylpentanePublished ArticlesShear viscosity coefficients of nitroethane and 3-methylpentane mixture have been measured using digital viscometer The measured values were over the entire concentration range above the critical temperature Tc = 299590 K in the range 0040 ? T- Tc ? 18570 K The results above the critical temperature Tc were analyzed by the mode coupling theory The anomaly of shear viscosity was detected as a function of temperature and concentration A least square fit near the critical temperature yields a value of noncritical part of shear viscosity ?0 = 0358 cP The Debye momentum cutoff qD and the constant A in the mode coupling approach were determined Our values of ?0 and A are in good agreement with the literature values
An-Najah University Journal for Research - Natural Sciences A ISSN: 1727-2114 Volume 16 Issue 2 2002 Pages: 117-124Critical Amplitude of Acoustical Attenuation in Mode-Coupling Theory for the Binary Mixture Aniline and Cyclohexanehttp://blogs.najah.edu/staff/emp_2160/article/Critical-Amplitude-of-Acoustical-Attenuation-in-Mode-Coupling-Theory-for-the-Binary-Mixture-Aniline-and-CyclohexanePublished ArticlesUsing Hornowskis theoretical modification of the critical amplitude the experimental ??crit?u?2AT values from mode-coupling theory of a binary liquid mixture aniline cyclohexane have been compared with the theoretical expressions given by Fixman Kawasaki Mistura and Chaban The experimental data at low reduced frequencies ? has been found to agree well with the Hornowskis model of AT However for the large values of reduced frequency ? 10 the mode-coupling theory of Shiwa and Kawasaki still exhibits poor agreement with the observed data mainly due to the form of scaling function The correlation length ?0 has been calculated by using ?0 the critical amplitude of the characteristic relaxation rate which gives the best fitting to the theoretical critical amplitude The adiabatic coupling constant g and the diffusion coefficient D0 have been obtained using Hornowskis expression of the critical amplitude
An-Najah University Journal for Research - Natural Sciences A ISSN: 1727-2114 Volume 15 2001 Pages: 011-020Noise measurements in the community of Nablus in Palestinehttp://blogs.najah.edu/staff/emp_2160/article/Noise-measurements-in-the-community-of-Nablus-in-PalestinePublished ArticlesThis paper presents the main results obtained in a general study of noise pollution in the city of Nablus in Palestine The equivalent noise level values L-eq were measured and tabulated for 50 locations spread over the area of the city The obtained result of noise level of the 50 L-eq values is in average 680 dBA It has been found that the L-eq values for 58 of the selected locations are exceeding 650 dBA This result is obviously higher than the adopted international standards Accordingly the area of Nablus is considered an unacceptable living area Hence its buildings streets and factories require severe reconstruction and modification plans In addition there should be adequate updated plans for setting up community noise surveys and ordinancesMeasurement of noise pollution in the community of Arrabahttp://blogs.najah.edu/staff/emp_2160/article/Measurement-of-noise-pollution-in-the-community-of-ArrabaPublished ArticlesThe problem of noise has been studied in the region of Arraba in Palestine as an example of the country side regions which are expected to be acceptable as a residential area The equivalent noise level values L-eq were measured and tabulated for 20 locations spread over the area of the town The average noise level from the 20 locations was 670 dBA It has been found that the L-eq values for 60 of the selected locations are exceeding 650 dBA This result is obviously higher than the adopted international standards Accordingly the area of Arraba town is considered an unacceptable living area Hence its buildings streets and factories require reconstruction and modification plans In addition there should be adequate updated plans for setting up community noise surveys and ordinancesUltrasonic absorption in critical binary mixture of perfluoromethylcyclohexane and carbon tetrachloridehttp://blogs.najah.edu/staff/emp_2160/article/Ultrasonic-absorption-in-critical-binary-mixture-of-perfluoromethylcyclohexane-and-carbon-tetrachloridePublished ArticlesThe results of ultrasonic absorption and velocity measurements for the system perfluoromethylcyclohexane-carbon tetrachloride are presented In addition viscosity measurements were made Ultrasonic absorption at 5 7 10 15 21 and 25 MHz above critical temperature Tc is analyzed using the dynamic scaling theory of Ferrell and Bhattacharjee The values of f2 vs f106 show a good agreement with the theory The experimental values of c for the binary mixture are compared to the scaling function FA Fifth-order Multiperturbation Derivation of the Energy Coefficients of Polyatomic Moleculeshttp://blogs.najah.edu/staff/emp_2160/article/A-Fifth-order-Multiperturbation-Derivation-of-the-Energy-Coefficients-of-Polyatomic-MoleculesPublished ArticlesA multiperturbation theory has been developed for molecular systems In the present paper we extend this theory to fifth order in the energy The bare-nucleus hydrogenic function is chosen as the zero-order wave function rather than the more customary hartree-fock function With this choice the multiperturbation wave functions are independent of the nuclear charges and of the total number of nuclear centers and electrons for the molecule and are thus completely transferable to other systems Making the simplest possible choice we describe an n-electron m-center polyatomic molecule as n hydrogenic electrons on a single center perturbed by electron-electron and electron-nucleus coulomb interactions With this choice of zero-order Hamiltonian H0 the first-order wave function for any polyatomic molecule will consist entirely of two-electron one-center and one-electron two-center first-order wave functions These are exactly transferable from calculations on He-like and H2-like systems To calculate the first-order and second order correction for the wave function of any polyatomic molecule we need the first-order and second-order correction for a two-electron atomic wave function the first-order and second-order correction for a one-electron diatomic molecular wave function and some additional mixed second-order corrections The wave functions necessary will be two-center one-electron at most
The second-order wave function for a polyatomic molecule contains additional contributions which cannot be obtained from the simple subsystems but represent multiple perturbation contributions which are two electron diatomic and one-electron triatomic in character
The expressions for the multiperturbation energy-expansion coefficients through fifth order are derivedCritical behavior of the ultrasonic attenuation and velocity and shear viscosity for the binary mixture of carbon tetrachloride and coconut oilhttp://blogs.najah.edu/staff/emp_2160/article/Critical-behavior-of-the-ultrasonic-attenuation-and-velocity-and-shear-viscosity-for-the-binary-mixture-of-carbon-tetrachloride-and-coconut-oilPublished ArticlesMeasurements of the ultrasonic velocity and absorption at the critical concentration were made as a function of temperature and frequency for the binary mixture of carbon tetrachloride and coconut oil In addition viscosity measurements were made Ultrasonic absorption at 5 7 10 15 21 25 30 and 35 MHz above Tc is analyzed by the dynamic scaling theory of Ferrell and Bhattacharjee [Phys Rev A 31 1788 1985] The values of cf2 vs f106 show a good agreement with the theory Also the experimental values of c for carbon tetrachloride and coconut oil are compared to the scaling function F The temperature and frequency dependence of the velocity are also determined The coefficient of viscosity of the critical mixture shows a different temperature dependence from that of the pure componentsCritical behavior of the ultrasonic attenuation and velocity and shear viscosity for the binary mixture of nitrobenzene-n-hexanehttp://blogs.najah.edu/staff/emp_2160/article/Critical-behavior-of-the-ultrasonic-attenuation-and-velocity-and-shear-viscosity-for-the-binary-mixture-of-nitrobenzene-n-hexanePublished ArticlesUltrasonic velocity and absorption as a function of temperature concentration and frequency 525 MHz and shear viscosity as a function of concentration and temperature are reported for the binary mixture nitrobenzene-n-hexane in the homogeneous phase above Tc For the observed absorption at critical concentration and critical temperature cf2 vs f106 yields a straight line as predicted by the dynamic scaling theory of Ferrell and Bhattacharjee [Phys Rev A 24 1643 1981] Also the critical amplitudes of the thermal expansion and specific heat have been calculated using the two-scale factor universality relation The adiabatic coupling constant g is calculated and compared to the experimental value In addition the experimental values of c where is the absorption at critical concentration above the critical temperature for nitrobenzene-n-hexane are compared to the scaling function F and show a good agreement with the theory Finally the velocity for the system at the critical concentration above the critical temperature appears to decrease linearly with increasing temperature