Issam Ashqer

Issam Ashqer
An-Najah National University · Department of Physics

Distinguished Professor of Physics(Full)

About

151
Publications
148,050
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,366
Citations
Introduction
Issam Ashqer currently works at the Department of Physics, An-Najah National University. Issam does research in Acoustics, Biophysics and Materials Physics. Their current project is 'Binary liquid mixtures'.
Additional affiliations
May 2005 - October 2015
An-Najah National University
Position
  • Professor (Full)

Publications

Publications (151)
Presentation
Full-text available
Proton transfer (PT) reactions, in particular single (SPT), double (DPT) or multiple (MPT), are widespread phenomena in many branches of the life sciences. These reactions proceed through the transfer of the proton between donor and acceptor atoms, in some cases catalyzed by water molecules acting as a connector between these donor and acceptor ato...
Presentation
Full-text available
DEAR COLLEAGUE, LET’S TOGETHER DEVELOP FURTHER DISCUSSION OF HONEY AS ZOOM CONFERENCE In view of the growing interest to the treatment properties of HONEY AND BEE PRODUCTS (propolis, bee bread, pollen, royal jelly etc.), with especial focus on antiviral properties, as well as enormous success of our fruitful discussion at Research Gate https://bit...
Article
BACKGROUND The effect of storage time on the fluorescence emission intensity and physico‐chemical properties of olive oil from the Palestinian cultivar Nabali Mohassan was studied. Olive oil samples stored up to 7 years were obtained from different olive orchards in Palestine, where prolonged storage is still in use. RESULTS Due to oxidation, all...
Article
Full-text available
وُجِد الإنسان الأول وهو محمّل بعقل كامل قادر على التمييز بين الحَسَن والقبيح من الأشياء؛ لِما أودعه الله -سبحانه- فيه من علم. ويؤيد هذا، شعور آدم وحواء (عليهما السلام) بالحياء لما بدت لهما سوءاتهما بعد خطيئتيهما -حسب الرواية القرآنية- {...فَلَمَّا ذَاقَا الشَّجَرَةَ بَدَتْ لَهُمَا سَوْآَتُهُمَا وَطَفِقَا يَخْصِفَانِ عَلَيْهِمَا مِنْ وَرَقِ الْجَنَّ...
Article
Full-text available
The temperature dependence of the sound absorption coefficient at critical composition and above critical temperature Tc for the binary mixture nitroethane-isooctane at 5, 7, 10, 15, 21, and 25 MHz frequencies (f) is investigated. The frequency dependence of the absorption coefficient (α) for the same critical binary mixture at different temperatur...
Article
Full-text available
The mode-coupling theory of Fixmen, Kawasaki, Hornowski, Mistura, and Chapan failed to explain the experimental behavior of the binary liquid mixtures at critical composition and above critical temperature. The analytic function of Fixmen’s, Kawasaki’s, Hornowski’s, Mistura’s, and Chapan’s theories was modified in order to get an agreement with the...
Article
h i g h l i g h t s mBJ-GGA and YS-PBE0 convert the CsCl structure from semiconductor to insulator for KH and RbH. mBJ-GGA and YS-PBE0 convert the CsCl structure from semiconductor to wide energy-band gap semiconductor for CsH. Three phase transitions have been predicted in this work, from RS to CsCl, RS to ZB and RS to WZ, for each compound. Under...
Article
Full-text available
This study was focused on the measurement of residential exposure to power frequency (50-Hz) electric and magnetic fields in the city of Ramallah-Palestine. A group of 32 semi-randomly selected residences distributed amongst the city were under investigations of fields variations. Measurements were performed with the Spectrum Analyzer NF-5035 and w...
Article
Full-text available
The equilibrium structural parameters, electronic and optical properties of the alkali hydrides RbH and CsH compounds in rock-salt (RS) and cesium chloride (CsCl) structures have been studied using the full-potential linearized augmented plane-wave (FP-LAPW) method. Wu and Cohen generalized gradient approximation (WC-GGA) was used for the exchange-...
Article
The calculation of the structural, mechanical and thermodynamic properties of the alkali hydrides XH (X= K, Rb and Cs) in rock-salt (RS), cesium chloride (CsCl), zinc-blende (ZB) and wurtzite (WZ) phases are done by using the full-potential linearized augmented plane wave (FP-LAPW) method within the frame work of the density functional theory (DFT)...
Article
Full-text available
In this study, levels of extremely low-frequency electric and magnetic fields originated from overhead power lines were investigated in the outdoor environment in Ramallah city, Palestine. Spot measurements were applied to record fields intensities over 6-min period. The Spectrum Analyzer NF-5035 was used to perform measurements at 1 m above ground...
Article
Full-text available
First principle calculations based on the density functional theory using the full-potential linearized augmented plane wave method have been carried out to determine the structural stability of different crystallographic phases, the pressure-induced phase transition and the electronic properties of LiH and NaH compounds. The rocksalt, zincblende,...
Article
The dynamic shear viscosity of the binary liquid mixture water - phenol was measured for different temperatures and concentrations using the glass capillary and digital viscometers. Dynamic shear viscosity anomaly was detected near the critical temperature T-c = 67.0 degrees C and the critical concentration x(e) = 33.9% by weight of phenol.The spec...
Thesis
Full-text available
Abstract This work focuses on the effect of storage age of Palestinian olive oil on the emission and absorption wavelengths using the fluorescence spectroscopy technique. In addition, the effect of storage age of olive oil on the physical properties: viscosity, refractive index, acidity, and mass density are studied. The results of the emission and...
Article
The dynamic viscosity was measured for water-phenol binary mixture at several concentrations and temperatures to determine the critical concentration and critical temperature. The critical concentration was determined at XC=3.90% by weight of phenol, the critical temperature was TC=67.0°C using the viscosity measurement while TC=67.8°C from an indi...
Thesis
Full-text available
Abstract The dose rate for X, Gamma ray and beta radiation flux density inside the control room and waiting room in the X-ray rooms have been measured by using Radiation moinitor, the measurements has been taking in the staff places, and at a height of 1 meter from the surface of the earth. The measured values of X-ray radiation dose were less than...
Presentation
Full-text available
Abstract The study sample consists of 74 workers who were chosen randomly from different seven landfills in West Bank. In this study, Gamma dose equivalent rate and Beta particles flux density were measured. In addition, the health parameters were measured to study the effect of ionizing radiation which arises from waste on landfill workers. The me...
Poster
Full-text available
Quality Assessment of Oil from Olive Trees Irrigated by Waste Water Using Fluorescence Spectroscopy W. A. Droubi1, S. Alshakshir1 and I. R. Abdelraziq2 1Chemistry Dept, 2Physics Dept., An-Najah National University ashqer@najah.edu Abstract This work focuses on the effect of irrigation of Palestinian olive oil on the emission and absorption waveleng...
Poster
Full-text available
Abstract This work focuses on the effect of storage age of Palestinian olive oil on the emission and absorption wavelengths using the fluorescence spectroscopy technique. In addition, the effect of storage age of olive oil on the physical properties: viscosity, refractive index, acidity, and mass density are investigated. The olive oil sample which...
Poster
Full-text available
Abstract The values of power flux density in some healthcare centers in Palestine have been measured. The average values of measured power flux density were 2000μW, 402μW, 1262μW and 28μW in Arab Specialist hospital, Patient friend’s society, Salfeet hospital and Rafediya hospital, respectively. The magnitude of electric field, magnetic field and t...
Article
The dynamic viscosity of castor oil was measured as a function of shear rate at different temperature ranged from 1.7°C to 62°C. In this study, shear stress and the dynamic viscosity as a function of temperature of castor oil decrease with increasing temperatures. Three and multi-constant formulas were proposed to obtain more suitable prediction of...
Article
In this study, olive oil samples of different irrigation system of different regions in Palestine were studied. The density, refractive index, acidity and viscosity of the samples were measured. The acidity of olive oil samples from different location and different irrigation system was measured. The overall results indicate that acidity increase f...
Article
Full-text available
ABSTRACT The dynamic viscosity of binary mixture of cyclohexane - phenol was measured over the entire range of temperatures and at concentration range (0.00% – 39.70%) by weight of phenol. The results above the critical temperature and critical concentration were analyzed by the mode coupling theory of one phase. The anomaly of dynamic viscosity wa...
Thesis
Full-text available
Two – Scale – Factor Universality of Binary Liquid Critical Mixture By Balsam Nader Ata Supervisor Prof. Issam Rashid Abdelraziq Abstract The dynamic shear viscosity of a binary liquid mixture phenol – water has been measured at different temperatures (50.0℃≤T≤75.0℃) and different concentrations (0.00% up to 100.00% by weight of phenol). The crit...
Thesis
Full-text available
Abstract In this study, olive oil samples of different irrigation system in Palestine were studied. The density, refractive index, acidity and viscosity of the samples were measured. The results indicate that acidity increase for samples with trees irrigated by waste water which can be classified as Lampante oil. The experimental results of viscosi...
Thesis
Full-text available
Abstract The dynamic viscosity was measured for water-phenol binary mixture at several concentrations and temperatures to determine the critical concentration and critical temperature. The critical concentration was determined at XC = 33.90% by weight of phenol, the critical temperature was TC = 67.0oC determined from the viscosity measurements. Th...
Conference Paper
Full-text available
Thesis
Full-text available
Abstract In this research, biodiesel samples of different percentages of blend biodiesel (Palestinian biodiesel prepared from waste oil) and petro-diesel were studied. The density, refractive index, flash point and viscosity of the samples were measured. The flash points were measured as a function of percentage of biodiesel, the results emphasiz...
Thesis
Full-text available
Abstract The physical properties such as: density, refractive index, viscosity, and acidity of samples of olive oil from different geographical locations and heights in Palestine were measured. The measured physical properties are in agreement with the international and local assigned value. The concentration of Al, Cd, Cu, Fe, K, Mg, Mn, Na, Ni, P...
Conference Paper
Abstract The dynamic shear viscosity coefficients of the binary liquid mixture cyclohexane - phenol for different temperatures and concentrations are measured using glass capillary viscometer. Dynamic shear viscosity anomaly is observed near the critical temperature T_c =17.0℃ and the critical concentration x_c=2.70% by weight of phenol. Mode Coup...
Conference Paper
Full-text available
Abstract In this research, biodiesel samples of different percentages of blend biodiesel (Palestinian biodiesel prepared from waste oil) and petro-diesel were studied. The density, refractive index, flash point and viscosity of the samples were measured. The flash points were measured as a function of percentage of biodiesel, the results emphasiz...
Conference Paper
Abstract The dynamic shear viscosity of the binary liquid mixture water – phenol was measured for different temperatures and concentrations using the glass capillary and digital viscometers. Dynamic shear viscosity anomaly was detected near the critical temperature T_(c )= 67 °C and the critical concentration x_c= 33.9% by weight of phenol. The spe...
Conference Paper
Abstract The dynamic shear viscosity of a binary liquid mixture of water and phenol has been measured at different temperatures (32.0 ℃≤T≤75.0 ℃) and different concentrations (0.00% up to 100.00% by weight of phenol) by using glass capillary viscometer and Brookfield viscometer model DV-I+. The critical temperature and critical concentration have b...
Conference Paper
Abstract The physical properties: density, refractive index, viscosity, and acidity of samples of olive oil from different geographical location and heights in Palestine were measured. The measured physical properties agreed with International and local standards. The concentration of Al, Cd, Cu, Fe, K, Mg, Mn, Na, Ni, Pb and Zn elements of olive...
Conference Paper
The dynamic shear viscosity of a binary liquid mixture phenol – water has been measured at different temperatures and concentrations. The critical temperature Tc and critical concentration x_c are found to be 67.0℃ and 33.90% by weight of phenol respectively, the critical density ρc is measured to be 0.8952 gm/cm3. The critical and background ampli...
Thesis
Full-text available
Abstract The dynamic shear viscosity coefficients of the binary liquid mixture cyclohexane-phenol for different phenol concentrations and temperatures are measured using glass capillary viscometer. Dynamic shear viscosity anomaly is observed near the critical temperature T_c =17.0℃ and the critical concentration of phenol x_c=2.70% by weight. Mode...
Article
Full-text available
Abstract: The dynamic shear viscosity coefficients of the binary liquid mixture carbon tetrachloride and coconut oil for different temperatures and concentrations are measured using digital viscometer with UL adapter. Shear viscosity anomaly is clearly observed near the critical temperature Tc = 22.2 ℃ and the critical concentration xc = 0.732 by w...
Article
Full-text available
Abstract The study population consisted of 237 children aged 5-6 years in Jenin city. The arterial blood pressure (systolic and diastolic), heart pulse rate, oxygen saturation in blood and tympanic temperature were measured before and after exposure to light intensity levels for four hours continuously. The light intensity levels were (0 - 60), (40...
Article
Full-text available
Abstract This study aims to investigate the effect of exposing to extremely low frequency electromagnetic radiation from high voltage transformers (160 KVA and 250 KVA) on students. The sample of this study was 142 students including 69 males and 73 females, with ages (16-18 years) and (9-11 years). This research was carried out on five schools in...
Article
Abstract This study reports the relationship between occupational noise levels with arterial blood pressure (systolic and diastolic), and heart pulse rate for dentists in their offices chosen randomly in Jenin City. The noise levels measured during operational periods in the chosen dental offices were found to be between 90.5 and 91.7 dB. The arter...
Thesis
Full-text available
Abstract The dynamic shear viscosity of a binary liquid mixture of water and phenol has been measured at different temperatures (32.0 ℃≤T≤75.0 ℃) and different concentrations (0.00% up to 100.00% by weight of phenol) by using glass capillary viscometer and Brookfield viscometer model DV-I+. The critical temperature and critical concentration have b...
Thesis
Full-text available
The dynamic shear viscosity of the binary liquid mixture water – phenol was measured for different temperatures and concentrations using the glass capillary and digital viscometers. Dynamic shear viscosity anomaly was detected near the critical temperature T_(c )= 67 °C and the critical concentration x_c= 33.9% by weight of phenol. The specific hea...
Article
ABSTRACT The mode-coupling theory of Fixman failed to explain the experimental behavior of the binary liquid mixtures at critical concentration and above critical temperature. The analytic function of Fixman’s theorywasmodified in order to get an agreement with the experimental behavior of the binary liquid mixtures at critical concentration and ab...
Article
Full-text available
ABSTRACT In this study, olive oil samples of different storage ages and locations in Palestine were studied. The refractive indexof the samples was measured. The refractive index of the olive oil samples were studied against storage ages and results showed that the refractive index decreases as a function of storage age.
Article
Full-text available
In this study, olive oil samples of different storage ages and locations in Palestine were studied. The experimental result of viscosity was compared with the powerlaw equation, and the behavior of olive oil was found to be Newtonian.
Article
Abstract The dynamic shear viscosity of a binary liquid mixture phenol–water has been measured at different temperatures (50.0°C ≤ T ≤ 75.0°C) and different concentrations (0.00% up to 100.00% by weight of phenol). The critical temperature Tc and critical concentration xc are found to be 67.0°C and 33.90% by weight of phenol respectively, the criti...
Article
The dynamic viscosity of castor oil was measured as a function of shear rate at different temperature ranged from 1.7°C to 62°C. In this study, shear stress and the dynamic viscosity as a function of temperature of castor oil decrease with increasing temperatures. Three and multi-constant formulas were proposed to obtain more suitable prediction of...
Article
Full-text available
Abstract: The acidity of olive oil samples from different locations and of different storage ages was measured on a yearly and weekly basis. In this work, the overall results of olive oil acidity as a function of storage age on a yearly basis indicate deterioration of oil quality. The acidity results for some olive oil samples suggest that the oil...
Article
Full-text available
This study focuses on the effect of EMR emitted by cell phone towers onsomeof the dependent variables, such astympanic temperature (T), blood oxygen saturation (SPO2%), heart pulse rate (HPR), systolic blood pressure (SBP) and diastolicblood pressure (DBP). The sample is 136 employees of both genders (56 female, 80 male), with mean age 40 Yrs., an...
Article
In this study, olive oil samples of different storage ages and locations in Palestine were studied. The refractive index of the samples was measured. The refractive index of the olive oil samples were studied against storage ages and results showed that the refractive index decreases as a function of storage age.
Article
Full-text available
In this study, olive oil samples of different storage ages and locations in Palestine were studied. The acidityof the samples was measured. The acidity of olive oil samples from different regionsand different crops showed that acidity increases as a function of storage age. Most of olive oil samples (storage age ≤ 12 years) acidity did not exceed t...