About this Journal

The Journal of University of Anbar for Pure Science (JUAPS)  is the official scientific Biannual publication of the University Of Anbar. JUAPS is an international, multidisciplinary, peer review and open access journal. Earlier issues, launched 2007, were published under the title " Journal of University of Anbar for Pure Science (JUAPS)" with 3 issues per year. The Journal obtained many Acknowledgment Letters from the Iraqi Ministry of Higher Education and Scientific Research. Now Journal (JUAPS) publishes 2 issues per year.

Best multi Approximation of Unbounded Functions by Using Modulus of Smoothness

Omar Amer Khashan 1 , Alaa Adnan Auad2* and Ghassa

Journal of University of Anbar for Pure Science ,

We present an estimate of the degree of best multi approximation of unbounded function on by algebraic polynomials in weighted space. The studied of the relation between the best approximation of derivatives functions in weighted space and the best approximation of unbounded functions in the same space.

On Q-Injective, Duo Submodules of C1-Module

Abdulsalam F. Talak*, and Majid Mohammed Abed

Journal of University of Anbar for Pure Science ,

This note investigates modules having quasi-injective and duo submodules. We introduce a new generalization of -module. The main method that was adopted in this generalization is how to obtain a submodule in having the characteristic Quasiinjective. We investigate the relationship between pseudo-injective module and Quasiinjective property of -module. Finally, we introduce a new relationship between Quasiinjective submodule and anti-hopfian module.

Experimental and Theoretical Study of Parabolic Trough Solar Collector Performance Without Automatic Tracking System

Khudir Zidane Zarrag*1, Fayadh M. Abed2, Salim. Y.

Journal of University of Anbar for Pure Science ,

In this research, a practical and theoretical study was conducted to evaluate the performance of parabolic trough collectors (PTCS) of length (3 m) and width (2.67 m) for three solar collectors connected in parallel, and the absorber tube is made of stainless steel with an internal and external diameter (0.028 m), (0.031 m), respectively. The absorber tube of length 11 m, was painted with un shiny black paint to increase the absorption of sunlight and reduces the thermal radiation. The working fluid is transferred through the receiver tube and located at the focus area of the three collectors. The collector width aperture width was 0.8 meters, and 2.40 meters length with rim angle of ? = 90°, and concentration ratio of 8.02. The collector surface was covered with aluminum foil which is available in the local market (3M SA-85), which covers galvanized iron sheets with a thickness of 2 mm. A computer program in Fortran language was built to calculate the performance of the solar collector. Experimental results of the test showed that the performance factor of the solar collector is less than the typical type, where notes that there is a large deviation between the theoretical and experimental results, especially in the winter, where the deviation in the morning at ten o'clock about 78%, while it was 5% at noon. The large deviation value mentioned resulting from the assumptions that have been developed to simplify the equations that were used in the theoretical side of research, also the reasons that the theoretical results are taken on the assumption that weather conditions are clear sky and that contrary to reality in the winter. جThe best efficiency of the solar collector was between solar time (12:00) and time (1:00) at night for two seasons, and the obtained results showed that the increase of mass flow rate of fluid from the amount of (0.033) kg/sec to the amount of (0.066) kg/sec increases the efficiency of solar collector, but leads to reduce the temperature difference between the inlet and exit, as well as the results showed that an increase in solar flux increases the useful energy obtained from the solar collector.

Cs2TiBr Solar Cell Performance Enhancement by Different Absorber Layer Thickness

Saleh K. Meza'al, and N. K. Hassan*

Journal of University of Anbar for Pure Science ,

Cs2TiBr6 is a promising material as an Absorber layer of Solar cell. Further studies showed that this compound is more stable, and possess an appropriate electrical and optical properties. The compound of (FTO/V2O5/Cs2TiBr6/CdTe) is simulated for the first time in this work by using the Solar Cell Capacitance Simulator (SCAPS-1D) program and the obtained transformation efficiency (?) was (10.09) with (0.5?m) of (Cs2TiBr6) thickness. The effect of (Cs2TiBr6) thickness was studied in this paper used different variations of absorber layer thickness (0.5 – 4.0 ?m). Solar cell enhanced by absorber layer thickness showed (18.17 mA/cm2, 0.924V, and 86.58%) (Jsc, Voc, FF) respectively which led to increase of transformation efficiency (?) from (10.09 % to 14.55%).

Best multi Approximation of Unbounded Functions by Using Modulus of Smoothness

Omar Amer Khashan 1 , Alaa Adnan Auad2* and Ghassa

Journal of University of Anbar for Pure Science ,

We present an estimate of the degree of best multi approximation of unbounded function on by algebraic polynomials in weighted space. The studied of the relation between the best approximation of derivatives functions in weighted space and the best approximation of unbounded functions in the same space.

On Q-Injective, Duo Submodules of C1-Module

Abdulsalam F. Talak*, and Majid Mohammed Abed

Journal of University of Anbar for Pure Science ,

This note investigates modules having quasi-injective and duo submodules. We introduce a new generalization of -module. The main method that was adopted in this generalization is how to obtain a submodule in having the characteristic Quasiinjective. We investigate the relationship between pseudo-injective module and Quasiinjective property of -module. Finally, we introduce a new relationship between Quasiinjective submodule and anti-hopfian module.

Experimental and Theoretical Study of Parabolic Trough Solar Collector Performance Without Automatic Tracking System

Khudir Zidane Zarrag*1, Fayadh M. Abed2, Salim. Y.

Journal of University of Anbar for Pure Science ,

In this research, a practical and theoretical study was conducted to evaluate the performance of parabolic trough collectors (PTCS) of length (3 m) and width (2.67 m) for three solar collectors connected in parallel, and the absorber tube is made of stainless steel with an internal and external diameter (0.028 m), (0.031 m), respectively. The absorber tube of length 11 m, was painted with un shiny black paint to increase the absorption of sunlight and reduces the thermal radiation. The working fluid is transferred through the receiver tube and located at the focus area of the three collectors. The collector width aperture width was 0.8 meters, and 2.40 meters length with rim angle of ? = 90°, and concentration ratio of 8.02. The collector surface was covered with aluminum foil which is available in the local market (3M SA-85), which covers galvanized iron sheets with a thickness of 2 mm. A computer program in Fortran language was built to calculate the performance of the solar collector. Experimental results of the test showed that the performance factor of the solar collector is less than the typical type, where notes that there is a large deviation between the theoretical and experimental results, especially in the winter, where the deviation in the morning at ten o'clock about 78%, while it was 5% at noon. The large deviation value mentioned resulting from the assumptions that have been developed to simplify the equations that were used in the theoretical side of research, also the reasons that the theoretical results are taken on the assumption that weather conditions are clear sky and that contrary to reality in the winter. جThe best efficiency of the solar collector was between solar time (12:00) and time (1:00) at night for two seasons, and the obtained results showed that the increase of mass flow rate of fluid from the amount of (0.033) kg/sec to the amount of (0.066) kg/sec increases the efficiency of solar collector, but leads to reduce the temperature difference between the inlet and exit, as well as the results showed that an increase in solar flux increases the useful energy obtained from the solar collector.

Cs2TiBr Solar Cell Performance Enhancement by Different Absorber Layer Thickness

Saleh K. Meza'al, and N. K. Hassan*

Journal of University of Anbar for Pure Science ,

Cs2TiBr6 is a promising material as an Absorber layer of Solar cell. Further studies showed that this compound is more stable, and possess an appropriate electrical and optical properties. The compound of (FTO/V2O5/Cs2TiBr6/CdTe) is simulated for the first time in this work by using the Solar Cell Capacitance Simulator (SCAPS-1D) program and the obtained transformation efficiency (?) was (10.09) with (0.5?m) of (Cs2TiBr6) thickness. The effect of (Cs2TiBr6) thickness was studied in this paper used different variations of absorber layer thickness (0.5 – 4.0 ?m). Solar cell enhanced by absorber layer thickness showed (18.17 mA/cm2, 0.924V, and 86.58%) (Jsc, Voc, FF) respectively which led to increase of transformation efficiency (?) from (10.09 % to 14.55%).

Plastic Waste Biodegradation by Local Bacterial Isolates in Ramadi City

Estbrak Yahya Eashur and Mohammed Abbas Jasim

Journal of University of Anbar for Pure Science ,

The current study aims to study biodegradation for plastic waste as one of the ways of treatment of plastic pollution by using isolated bacterial isolates from plastic waste collection and landfill areas in the city of Ramadi and surrounding areas during different periods. Diagnosis of bacterial isolates was performed based on phenotypic and physiological tests as well as testing on the VITEK 2 system, isolates were selected that go back to the type Pseudomonas sp. and Streptomyces sp. Bacterial isolates have been studied for its ability to breakdown plastic waste used in the manufacturing of drinking bottles and shopping bags by collecting samples of plastic waste and assured they are washed and sterilized perfectly. Another experiment was conducted through a second decomposition (A carbon deficient) medium as well as the second decomposition medium contains some chemicals that are thought to help accelerate the process of decomposition. Results showed that the highest polyethylene breakdown occurred due to isolate P1 (Pseudomonas fluorescens) by the degradation rate 8.83% on the first decomposition medium and 30.5% on the second decomposition medium, while the degradation rate to isolated P4 (Streptomyces) was 4.83% on the first medium and 19% on the second medium. The genetic study results showed existence of the enzyme PETase gene on Pseudomonas fluorescens chromosome in an expected size 119bp and it was absent on plasmid.

Concentration Effect of Mixed SnO2-ZnO on TiO2 Optical Properties Thin Films prepared by Chemical Spray Pyrolysis Technique

Najlaa T. Latif and Jamal M. Rzaij*

Journal of University of Anbar for Pure Science ,

In this work, the concentration effect of mixed tin dioxide and zinc oxide on optical properties of titanium dioxide thin films was studied. Thin films were prepared by using spray chemical pyrolysis technique on glass substrate at 350 ?C. The optical results revealed a weak optical transmittance for Un-doped TiO2 at the end of ultraviolet spectrum followed by an increase, more than 48%, at the near IR spectrum. TiO2 thin films revealed more transparent with blue shift in the absorption edge when the SnO2-ZnO mixed increased. A significant decrease in the absorption coefficient with increasing the mixed of SnO2-ZnO. According to the results of the electronic transition of TiO2, thin films have direct and indirect energy gap, about 3.2 eV and 2.11 eV, respectively. An increase in both types of energy gap was observed with the mixing concentrations of SnO2-ZnO increase. In addition, a significant decrease also was in the refractive index and extinction coefficient with the increasing SnO2-ZnO concentration.

Study of Mechanical Properties and Thermal Conduction of Polymer/Ceramic Nanocomposites

Ahmad H.M. AL - Falahi*

Journal of University of Anbar for Pure Science ,

A composite materials were prepared using a polymeric blend of epoxy resin and unsaturated polyester as a matrix material, and using a nanoceramic powder Lead Zirconium Titanate as a reinforcement material in different adding ratios( 2wt % & 6wt % ). Impact strength, surface hardness, thermal conductivity and solutions absorption tests were carried out for the polymeric blend and composite samples. The pre-immersion results showed that adding the ceramic powder to the polymeric blend improved the surface hardness, increased thermal conductivity as well as reduced impact strength. Immersing the samples in H2SO4 acid and kerosene caused of decrease in impact strength and surface hardness as well as increase in thermal conductivity. It was also noticed an increase in the absorption rate of acid and kerosene solutions in a manner proportional to the duration of immersion.

Effect of Chemical Solutions on Some Mechanical Properties of (Fe + Cu/UPE)

Mustafa Hamdi Ismael* and Faik Hammad Anter

Journal of University of Anbar for Pure Science ,

This research includes the preparation of polymeric composites by (Hand lay-up method) of unsaturated polyester resin as a matrix material and (iron, copper) particles as strengthening materials with different weight ratios (5%, 10%, 15%, 20%). The hardness and impact strength properties are studied before and after immersion in (NaOH) solution and (HCl) solution at a normality of (0.3N) and for a period of one immersion (30 days). The results showed that the hardness and impact values increased with the increase in the percentage of iron and copper before immersion, after immersion, that hardness and impact strength values increased with increasing the iron and copper ratio of the compounds For all samples, but their value was lower than in normal conditions. And also these values in the (HCL) solution were lower than the (NaOH) solution.

SECURE E-MAIL SYSTEM USING S/MIME AND IB-PKC

**MOHAMMED T. IBRAHEM SUFYAN T. FARAJ

Journal of University of Anbar for Pure Science ,

Although e-mail security solutions have been introduced for more than two decades, most of the e-mail messages are sent nowadays without being secured by any of these techniques. This is due to the complexity of using these secure e-mail systems and protocols. The complexity mainly arises from the difficulty associated with managing certificates and public keys. The main objective of this study was to find a solution that can make secure e-mail systems easier to use while maintaining the same level of security. This paper proposes a secure e-mail system that is based on the S/MIME standard where the public key and signature algorithms have been replaced by their Identity-Based Cryptography analogue algorithms. Using Identity-Based Cryptography has eliminated the need for digital certificates, and provided a solution to the usability problem present in the existing secure e-mail systems. Users can determine the public key of the recipient without having to contact any trusted third party, and can start encrypting or verifying messages as long as they have the public system parameters that can be publicly available. Users need to contact the Private Key Generator (PKG) only once in order to retrieve their private key before being able to decrypt or sign messages.

Experimental investigations of Synchronization in two optically coupled chaotic systems utilizing optical feedback and optical injection

Salam K. Mousa , Qassim M.J.Abdulaziz , Kais.A.

Journal of University of Anbar for Pure Science ,

An experimentally observations of chaos synchronization have been investigated between two optically coupled laser diodes. Two schemes of optical injection, bidirectional and unidirectional optical injections have been used. One of the two lasers MLD exhibits optical chaos due to external optical feedback by fiber mirror and the other laser diode SLD exhibits optical chaos by optical injection from the first one. The chaotic dynamics of both lasers were a function of laser diodes drive current. Synchronization and Anti-synchronization between two coupled laser diodes have been observed, and ensured by different measurements like time series matching ,correlation diagram(phase form)of amplitudes of coupled chaotic signals ,spectrum components coinciding of coupled chaotic signals, and coherence have been used for both injection schemes.

Improving Efficiency of Round Robin Scheduling Using Ascending Quantum And Minumim-Maxumum Burst Time

Ali Jbaeer Dawood

Journal of University of Anbar for Pure Science ,

Round Robin (RR) is a kind of process algorithms, where the time quantum is fixed along the processes execution. In the other hand it depending on the First Come First Serve (FCFS) algorithm. Also RR performs in timesharing system by given each process static Time Quantum (TQ). In this paper, The TQ studied to improve the efficiency of RR and performs the degrades with respect to Context Switching (CS), Average Wait Time (AWT) and Average Turned Around Time (ATAT) that an overhead on the system. Thus, the new approach was proposed to calculate the TQ, known as Ascending Quantum and Minumim-Maxumum Round Robin (AQMMRR). The processes were ascending with shortest remaining burst time and calculate the TQ from multiply the summation of minimum and maximum BT by (80) percentage. The experimental result shows that AQMMRR performs better than RR and comparing with other two related works

Compared Some Water Characteristics of Tigris River With Euphrates River

Sabah Obaid Hamad

Journal of University of Anbar for Pure Science ,

: A number of physical and chemical ambient water characteristics of the Tigris and Euphrates rivers were studied on a monthly basis over the year (2011). Samples through 61 sampling station was collected, which distributed by 39 stations along the Tigris river and 22 station along the Euphrates river. Samples collected were analyzed to find a number of variables. The variables measured include cations group (Ca, Mg Mg, Na Na), anions group (Cl, SO4), nitrate NO3, phosphate PO4, total dissolved solids TDS, in addition to measuring pH.Data were analyzed statistically to extract the results. Results showed that average concentrations of calcium ions to the Tigris River 69 mg /L, and the Euphrates River 139 mg /L. The average concentration of magnesium ions of the Tigris River is 34 mg /L, while of the Euphrates River is 67 mg /L. Average concentration of sodium ions of the Tigris River is 58 mg /L, and the Euphrates River is 247 mg /L. Average concentration of sulfate ions of the Tigris River is 154 mg /L, and the Euphrates River is 425 mg /L. Average concentration of chloride ions of the Tigris River is 98 mg / L, and the Average of the Euphrates River is 375 mg /L. Average concentration of nitrate ions of the Tigris River is 3.48 mg /L and the same average value registered to the Euphrates River. Phosphate ions concentration rate of the Tigris River is 0.24 mg / L, and the Euphrates River is 0.20 mg /L. Average concentration of total dissolved solids of the Tigris River is 530 mg / L, while the Euphrates River is 1419 mg /L. Average pH value of the water for the Tigris River is 7.6 and 7.8 for Euphrates River. Water quality of the Tigris and Euphrates rivers varies from one section to another. Water quality is better in the upstream sections of the rivers. There is a general trend to increase salinity and degradation of water quality whenever river stream Turn south because of decreasing water level and accumulation of pollution loads. Water quality of the Tigris generally better than the quality of waters of the Euphrates, where many tributaries supply Tigris river with freshwater inside Iraqi territory while Euphrates River exposed to different effluent inside Syrian territory before entering the Iraqi border. Recorded values of most variables measured of the Euphrates river greater than the values of Tigris River at the beginning of the entry of the rivers into the Iraqi border. Euphrates River compared with the Tigris River was exposed to different effluent discharges especially agricultural discharge in the central and southern regions in addition to changing hydrological conditions.



Journal of University of Anbar for Pure Science


Publisher: University of Anbar
E-Mail:juaps@uoanbar.edu.iq
Editor-in-Chief: Prof. Abid Ali Thaker