Table of content

Baghdad Science Journal

مجلة بغداد للعلوم

ISSN: 20788665 24117986
Publisher: Baghdad University
Faculty: Science for Women
Language: Arabic and English

This journal is Open Access

About

A Scientific and Evaluated Journal Published by the College of Science for Women, University of Baghdad
Date of First issue(2004)
No.of Issue per year(4)
No.of papers per issue (25)
No. Of issue published between 2004-2016(50) issue
This Journal publish paper in Arabic and English in area of Biology, Chemistry, Physics, Mathematics and Computer.

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Contact info

Phone Number:07800709148
E-mail: bsj@csw.uobaghdad.edu.iq
E-mail: baghdadscij@csw.uobaghdad.edu.iq
E-mail:bjs.csw@gmail.com

Table of content: 2004 volume:1 issue:2

Article
PREPARATION OF NITRATION DERIVATIVES OF BILE SALTS AND ACIDS FOR MEDICAL USE
تحضير ودراسة مشتقات نترجة املاح واحماض المرارة للاغراض الطبية

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Abstract

The derivatives formed after the successive acetylation, esterification and nitration reactions to cholic, deoxycholic, and taurocholic acids were identified to be of the following general strucure: Colt, Where RI=NO3, OH, 0=, or CH3COO. R2=H, NO3, OH, 0-=, or CH3COO. R3=H, NO3,01-1, 0=, or CH3COO. R4=OH, NH(CH2)2S03Na, NH(CH2)2S03H, or OMe. By using U.V-visible and I.R spectrophotometry . The number of hydroxyl groups was determined, purity was checked from T.L.C, Most of these derivatives will find pharmaceutical application.

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Article
The effect of unsecured use of chemical pesticides on the environment and health in Iraq
اثر الاستخدام غير الامين للمبيدات الكيمياوية على البيئة والصحة في العراق

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Abstract

The wide use of pesticides in recent years leads to rapid distribution of these pollutants in the environment (air, water and soil).They were transported by means of air or water to biological ecosystems. They become more toxic through the processes of biological magnification while some of them persist for along period.The aim of this work is to show the negative effect that chemical pesticides causes, and in the same to show their side effect on the environment and health in Iraq. We could conclude that the bad use of these chemicals could cause an urgent impact now or in the future. Governmental offices dealing with these materials should take the right measures to minimize the danger and the misuse of these chemicals by seeking alternatives ways of control. That may be safer and has no haphazard effect on health and environment, keeping in mind that mass media of clarification of the danger of these pesticides is fundamental duty to keep better health and environment in Iraq.

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Article
The pathological changes of the digestive system for Anas platyrhychos in Baghdad and Kut in Iraq which infectel with platyhelminthes and nematodes
التغيرات المرضية في الجهاز الهضمي للخضيري المدجن في بغداد والكوت - العراق نتيجة لاصابتها ببعض الديدان الشيريطية والاسطوانية

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Abstract

A total of 247 Mallard ( Anas platyrhynchos platyrhynchos L.) from Baghdad and Kut were examined for the Cestodes Diorchis stefanskii Sobolevicanthes gracilis; Hymenolepis mastigopraditae and the Nematode Amidostomum acutum in the first time in Iraq . Among these , 151 birds were found infected by these helminthes It has been found small nodules on the external surface of the intestine , Ulceration of mucosa inflammatory infiltrate , Oedemats changes and hyperplasia in the section of infected intestine were noticed.

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Article
The relation between some of phenotype characteristics of corn and infection by corn stem borer Sesamia cretica.
العلاقة بين بعض الصفات المطهرية للذرة الصفراء والاصابة بحفار ساق الذرة

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Abstract

This study was conducted to know the effect of some phenotype characteristics of corn plant on infection by (CSB), using 13 genotypes of corn plant, planting during autumn season 1997 and 1998. The result revealed that the mean of plant height (with male flowering) was (183-219) cm, the mean of leaf No./ plant in all genotypes was (16-18) leaf but the leaf area of plant was (4350-6249) cm2, there were significant differences of phenotype characteristics between genotypes ,the percentage of infection by (CSB) was (5.9-35.9),% the result showed that the phenotype characteristics had non effect on the infection percentage by (CSB) and the correlation coefficient was not significant.

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Article
The chronic effects of salinity on the Crustacean Moina affinis Birge (1893)
التأثيحيورات المزمنة للملوحة في الحيوان القشري Moina affinis Birge (1893)

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Abstract

Thi s study included the effect of chronic exposure of di fferent concentrations of Nan on the biology of fresh water zroDplonk ton species Moina 41.112' ( Cladcxe'ra The concentrations used for chronic exposure were 03, 0.75. 1 960 to investigate iI effects on the life cycle and la lables of this species after exposure period and the range of this exposure effects on the rate of expectation for further life, also the effect of salinity on reproduotive parameters was studied which included average of total number of eggs and young produced, volume clutch's (6.95. indiclutch for control group , 14.516 indi clutch for 0.596a ,3_65 ind./ clutch for (175 5(.. and 03 Ind} cruel] for 1960) and number of Clutch's (5.5 clutch/ female for control group, 1.7 clutch/ funEoc for 0.5.9(z.z, 1:2 dutch?' female for 0,75960 and 0,1 oluchi female for 196.) which howed a reduction_ But had no effects on the time 10 tarsi clutch produced. Time of surviving ( 12.9 day for control g.roup. 63 day for 0.5%0, 15_2 day for 0.75%.0 and 4.6 day for I 9f,), average final length and average of daily length, growth increasing were studied_ In addition to the studying the orient of salinity on the number of moults which showed a reduction. in its number.

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Article
Effect of sowing Dates of some bread wheat cultivars on Disease response toward the fungal pathogen Wheat leaf rust
تاثير مواعيد الزراعة على الاستجابة المرضية لبعض اصناف حنطة الخبر للفطر الحنطة لمسبب لمرض صدأاورااق الحنطة

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Abstract

Disease responses of eight wheat cultivars , Saber Beg. , Abu-Ghraib 3, Mexipak , Tamoz 2,Tamoz 3 , IPA 95 ,IPA 99 and Tahadi which were grown in four different sowing date , 25 th October , 19th September , 14th December and 8 January , to leaf rust disease caused by Puccinia recondita were investigated under natural infection conditions at the experimental farm , College of Agriculture , Abu-Ghraib, during the growing season of 1997-1998.Results of this study revealed that IPA 95, IPA 99 and Tahadi showed moderate resistant reaction, while Tamuz 3 was moderateley susceptable . Abu-Ghraib , Saber Beg, Tamuz 2 and Mexipak showed susceptible yeaction to the causal agent . The first sowing date was not suitable for disease progress in comparsion to the fourth date where the highest disease severity were observed . The results also showed some correlation between disease response of each cultivar and the amount of chlorophyll, starch, soluble sugar in the flag leaf , and the Yield of each cultivare at the sowing dates were also obtained.

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Article
MEASURING OF FARMERS ADOPTION LEVEL FOR MODERN IRRIGATION SYSTEM AND THEIR WIDE APPLICATION
دراسة مستوى تبني المزارعين لمنظومات الري بالرش

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Abstract

74 fanners were randomily selected from the Lc:ital. of 406 fanners using the Modern Irrigation System up to November , 2000 , for the purpose of wide adoptation of such system. Rcsults indicated according to the data which has been obtained and statistically analysed by the statistical package for the Social Sciences (SPSS) program showed that the majority of the farmers adopted this new system of irrigation due to the increase in the yield up to 5" .

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Article
The effect of phenolic compound from Albizzia Seed on Biology of lesser grainborrer RhiZopertha dominica (coleoptera:Bostrichidae)
تأثير المركبات الفينولية لبذور الالبيزيا على بعض الجوانب الحياتية لثاقبة الحبوب الصغرى RhiZopertha dominica (coleoptera:Bostrichidae)

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Abstract

The lesser grain boner Rhizopertha dominica is an important insect on grain in Iraq . in this study phenol and coumarin were isolated from Albizzia lebbek . the addition of there compounds to artificial diet at concentration of 3.4,5% couse high effects on the development of the studed insect larva.the larva were unable to complete its development to adult stage. More over, using 5% coumarin larva were died.Seed germination was not affected when seed were sprayed with concentration of 3,4,5% of coumarin and phenol.

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Article
Using of Nuclear Track Detector CR-39 To Measure Depleted Uranium Concentration of Mother's Milk.
CR-39استخدام كاشف الاثر النووي لقياس تراكيز اليورانيوم المنضب في حليب الام

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Abstract

Biological samples of mother's milk were collected from Iraqi southern provinces(Basrah,Messan,al-Muthana,Thikar)and Baghdad province to measure uranium concentration of the samples by using track technique of fission fragments as a result from uranium atom fission with thermal neutrons from neutrons source 24 I Am-Be with activity 16Ci and neutron flux of 5000 n/cm2.s on using nuclear track detector CR-39 It was found that the high percentage of depleted uranium concentration on the samples from Muthana province , which accounted as 4.183ppm therefore the samples was taken from the provinces (Thikar,Basrah,Baghdad),which was accounted the depleted uranium concentration as following (1.243,2.172,2.875) ppm respectively, with appear a small concentration percentage in the Messan province which was accounted (0.230)ppm .Although, this concentration was been on the one baby food menu from mother's milk nutrition.ln this research,the concentration of some essential trace elements in human breast milk, Ca, Na, K, Mg, Fe, Cu, Mn, Zn, Cr, Pb, Cd, Hg,was measured in the samples was taken from the above provinces by using atomic absorption technique and the result was indicated appear change in the concentration of the elements of the samples.

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Article
The Effect of Heat Treatment on the Magnetic and Mechanical properties offe - Ni alloys.
تأثير التلدين على الخواص المغناطيسية والصلادة الميكانيكية لسلسة سبائك Fe — Ni المحضرة بطريقة السباكة

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Abstract

The aim of this work is studying the binary system لأ'اءم Ni؛)with two ratios (y=36,80) by using casting method for preparing the samples.Magnetic and Mechanical properties have been studidt different httrea^nttem^rature.All the alloys were found a ferromagnetic behavior and sensitive to the heat treatment. Best properties were found at the heat treatment 1100 C°.A significant different results were found above 1100C° for lower magnetic and mechanical values. This is possibly due to the change on the degree of magnetic moment orders, in which most of the moments are started to remove from coupled ferromagnetically. 

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Article
SiCi_xNxthin films preparation by TEA-Co2 Laser induced Vapor-phase reaction and study of the nature of chemical bonds and some their electrical and optical properties
تحضير اغشيةSiCi_xNx الرقيقة من TEA-Co2 تفاعل الطور الغازي المحتث بليزر ودراسة طبيعة الاواصر الكيميائية وبعض الخصائص البصرية والكهربائية

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Abstract

A pulsed (TEA-0O2) laser was used to dissociate molecules of silane ethylene (C2I-14) and ammonia (NH3) gases, through collision assisted multiple photon dissociation (MPD) to deposit(SiC i_xNx) thin films, where the X-values are 0, 0.13 and 0.33, on glass substrate at T,----648 K. deposition rate of (0.416-0.833) nm/pulse and thickness of (500-1000)nm .Fourier transform infrared spectrometry (FT-IR) was used to study the nature of the chemical bonds that exist in the films. Results revealed that these films contain complex networks of the atomic (Si, C, and N), other a quantity of atomic hydrogen and chemical bonds such as (Si-N, C-N, C-14 and N-H).Absorbance and Transmittance spectra in the wavelength range (400-1100) nm were used to study the optical properties of the deposited films. It was found the optical nergy ap E0) of these films is indirect and increases with increasing (X) while the width of localized states decreases.The study of the electrical properties of the deposited films revealed that their electrical conductivity at any constant temperature decreases with increasing (X) and the films have two activation energies both increase with increasing (X).

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Article
EXTENSION OF HIGH REFLECTANCE BAND WIDTH FOR FAR INFRARED SPECTRAL REGION : (1)
توسيع عرض حزمة الانعكاسية العالية للمنطقة تحت الحمراء البعيدة

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Abstract

Extension of bandwidth for high reflectance zone for the spectral region (8-14pm) was studied adapting the concept of contiguous and overlapping high reflectance stacks. Computations was carried out using the modified characteristic matrix theory restricted to near-normal incidence of light on dielectric , homogenous and isotropic symmetrical stack. Certain precautions must be taken in the choice of stacks to avoid deep —reflectance minima from developing within the extended high reflectance region. Results illustrate that the techniques of extending the high reflectance regions are applicable not only to mirrors , but also to short-and long-edge filter and to narrow band pass filters.

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Article
Study the influence of Annealing upon electrical properties of The prepared films ZnSe by Thermal evaporation in Vacuum
ZnSe دراسة التلدين على الخواص الكهربائية المحضرة بطريقة التبخير الحراري الفراغ

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Abstract

Thin films of ZnSe arc deposited on glass substrates by thermal evaporation in vacuum with different thickness (1000, 2700, 4000) A° temperature (293-373) °K are studies the electrical properties before and after annealing. The result show decrease D.0 conductivity and increasing the activation energy Eat.

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Article
The Effect of Grain Boundaries on Schottky Diode Parameters
تأثير حدود الحبيبات على بعض متغيرات ثنائية شوتكي

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Abstract

The activation energy and optical band gap of different regions (p-type) polysilicon have been measured. Both microscopic studies and current-voltage characteristics of diodes prepared on different surface regions were carried out. Comparison of diodes parameters and microscopic studies indicate that the type of angles between boundaries has a significant effect on diodes parameters while the boundary lengths per unit area has less effect. The mechanism of Al-interaction with grain boundaries and their intersecting points at different temperature were also studies. The X-ray fluorescence spectrometry has been used for detection of diffused A1%.

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Article
study Of Optical Properties Of Copper-Doped Cds Thin Films
دراسة الخواص البصرية لاغشية كبريتيد الكادميوم المشوبة بالنحاس

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Abstract

Thin films of CdS:Cu were deposited onto glass substrate temperature 400 °c. The optieal properties have been studied for Cds doped with (1,3, 8) wt% of Cu before and after Gamma irradiation. It was found that the irradiation caused an ( Frenkel defects) where the atom is displaced from its original site leaving vacancy and forming on interstitial atom. It was found the irradiation caused an absorption edge shifting towards long wavelength as a result of the increasing of Cu concentration.

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Article
Laser Finger Print Sensor with Holographic Grating
متحسس ليزري ومحزز هولوغرافي بصمة الاصبع

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Abstract

Design and Construction system for recording Finger print by laser, and separted the signal to noise by holographic element, was done. For safety, total reflection lighting ensures hat aser earns an not enter An operators eyes. Holographic diffraction grating was used instead of computer program to contrast images.

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Article
CALCULATION OF EXCESS MOLAR VOL-UMES OF SOME TERNARY LIQUID MIX-TURES AT 303.15 K
حساب الحجوم المولارية الفائضة لبعض المحاليل ثلاثية المكون عند 15، 303 كلفن

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Abstract

Excess molar volumes of five ternary mixtures of 2- methoxy ethanol(1) +butyl acetate(2)+benzene(3), +toluene(3), +chlorobenzene(3), +bromobenzene(3), and +nitrobenzene(3) have been measured at 303.15K. The excess molar volume exhibited positive deviation over the entire range of composition in the systems 2-methoxy ethanol(1)+ butyl acetate(2)+ benzene(3),+toluene(3) and sigmoid behavior in the case of the remaining systems. Flory's statistical theory have been extended to predict the excess molar volumes of the five ternary mixtures at 303.15 k over a wide range of composition . An excellent agreement has been found between the experimental and theoretical excess molar volumes , both in magnitude and sign .

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Article
Analytical Potentiality of Computer - Controlled Background Correction with Electrothermal Atomic Emission Spectrometry : Determination of Copper in Milk Powder
دراسة الكفاءة التحليلية لمطيافية الانبعاث الذري الكهروحراري باستخدام الحاسوب : تقدير النحاس في الحليب

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Abstract

A fully automatic electrothermal atomic emission spectrometry (ETA-AES) is described. This system is based on an echelle monochromator modified for wave¬length modulation which is completely controlled by microcomputer . The advantages of the system in atomic spectrometry have been discussed . Aspects of the analytical performances such as calibration ء dection limit, precision , and recovery for copper are considered . This system is applied for routine determination of copper in commercial powdered mill، by slurr>' atomization versus aqueous atomization techniques.

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Article
Study of corrosion ofAI- bronze in Sodium Chioride Solution in the Presence ofbenzotriazole
دراسة تاكل برونز - المنيوم في كلوريد الصوديوم بوجود بنزوترايازول

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Abstract

The corcosion behoviour of Aluminum bronze in sodium chloride solution has been studied ^tentiostatically at five temperatures in the range 293-313K.The corrosion potential shifted to more negative values with increasing temperature. The corrosion current density increased with increasing temperature. Values of Tal'el slopes and the transfer coefficients indicated hydrogen evolution reaction to occur at the cathode and mainly the dissolution at the anode.Benzotriazole (BTA) had an inhibiting effect ٠١١ the corrosion of the Al-bronze in deaerated NaCl solution at a concentration (1*10'ؤ- IxlO‘1) mol dm'^ over the temperature range 293-313K. Values of the protection efficiency and kinetics parameters were obtained from the corrosion current densities. 'I’he results indicated that corrosion reaction on Al-bronze occurred on surface sites having different energies of activation.

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Article
Synthesis and characterization of some modified polyvinyl alcohol
تحضير ودراسة بعض خواص بولي فاينيل الكحول المحور

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Abstract

Some esters were prepared from reaction of different molecular weight of PVA with some acid chloride (prepared by reaction of acid with thionyl chloride or phosphorous pentachloride)in the presence of pyridine. The thermal and reological properties were studied. The increasing Of bulky groups decreasing stability of the thermal and reological properties.

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Article
Gender differences in achievements among students of the Iraqi college of medicine
تقييم فروقات الاداء بين طلبة الكلية الطبية العراقية

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This study was conducted to test the hypothesis that the duration of time spent by the student inside the examination rooms answering the all kinds of written ex-amination questions has some kind of a positive effect on the final score he will get from that exam. And if there arc gender differences in this respect. Students and methods: Data on the final examinations of the autumn quarter was gathered on 892 examina-tions conducted at the end of this quarter , this included male participants of 566 and females of 326. Examinations were on twenty different subjects , including all of the first five years of the undergraduate students of Iraqi College of Medicine for the academic year 2002 — 2003 . The scheduled time of the examinations was 3 hours.A questionnaire for that purpose was constructed by the researchers and filled by the examination supervisors of the examination rooms . The scores we got from the offi-cial records of the examination committee of the college . Information gathered in-cluded year or stage of the student , subject of examination, gender, duration of time spent by every student inside the examination room and final score on that examina-tion. data were entered into a computer statistical program SPSS 7.5 and statistically analyzed. The results showed 1. The mean duration of stay of students in examination rooms was 125.01 SD=39.32 out of 180 minutes. 2. Females significantly spend more time in the examination rooms (p=0.008), but they do not achieve better marks for this. 3. No significant gender difference in mark acquisition although females regis-tered insignificantly better marks. 4. Mark is affected by the duration of time spent in examination rooms significant positive correlation (p=0.001). 5. However total duration of stay affected the final mark for males (p=0.01). but did not affect that of the females (p=0.27) 6. Females significantly spend more time in the examination rooms (p=0.008), but they do not achieve better marks for this. 7. Males benefit from time spent in getting significantly better results (p-0.01) 8. According to grades or year or stage of the student the longest time spent was significantly more in the first year (p=0.0001) but there was no correlation with the year . The highest marks were recorded by the first year students (p=0.0001)

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Article
Microbiological studies of a new naphthoquinone semicarbazone derivatives
دراسة الفعالية المايكروبايولوجية لاثنين من مشتقات النصف كاربازونية الجديدة

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The antimicrobial activity of two naphthoquinone semicarbazone derivatives (Two newly synthesized compounds) have been studied by using tube — diluation and disc plate technique. The effect of those derivatives upon pathogenic microorganism iso-lated from specimen(urine iwounds,stool, swabs, throat ....etc) have been studied also in comparison with the antibiotics (amikacin,ampicillin, carbencillin, cephalothin, cefoxitin,clindamycin ,erythromycin,gentamycin,penicillin,tetracylin and tri-methoprim. It was shown that derivative(1) had more effective against micro organ-ism than derivative(11).

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Article
Benthic Algae in Lower Zab Tributary and Tigris river
الطحالب القاعية في رافد الزاب الاسفال ونهر دجلة

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Benthic algae of Tigris river and one of its northern tributary the lower Zab were study at monthly intervals during Nov. 2001-Oct. 2002. Four sites were selected, a total of 115 species of algae were identified during this study, diatoms was the dominating group (86 species) followed by Chlorophyta (18 species), Cyanophyta (7species), Euglenophyta (2 species) and one species for each of Pyrrophyta and Chryzophyta. Pennate diatoms formed the major density within the identified algae and distributed among all stations especially the species Achnanthes minutissima, Navicula gracilis and Nitzschia palea, the diatoms bloomed in spring and autumn seasons. Bio-diversity and density of benthic algae in Tigris river was affected negatively by the entering waters from Lower Zab tributary, this was indicated by the decreasing values after the confluence.

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Article
Performance quality of single and ،two stage solar concentrators
تقييم اداء المركزات الشمسية الاحادية والثنائية المرحلة

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The performance of single and two stage solar concentrator were studied ' " The ratio of the primary to the secondary mirrors diameter is taking to be 0.5, depending on the theoretical calculation for the accumulated energy by the concentrator with ratio between 0.0 to 0.9. The design of the systems were designed and examined by using a ray-tracing program. The efficiency of the single and the two stage concentrators are calculated and compared with and without cooling systems.

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Article
Evaluation of Laser Doping of Si from MCLT Measurement
تقييم عملية اشابة السليكون بالليزر من خلال قياسات فترة حياة حاملات الشحن الالية

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The measurement of minority carrier lifetime (MCLT) ofp-n Si fabricated with aid of laser doping technique was reported. The measurement is achieved by using open circuit voltage decay (OCVD) technique. The experiment data confirms that the value of MCLT and proftle of Voc decay were very sensitive to the doping laser energy.

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Article
The effects of raddiation on the optical properties of GERMANIUM SELENIDE semiconductor.
تأثير اشعاع بيتا على بعض الخواص البصرية لاغشية الجرمانيوم سيلينايد العشوائية

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Study was made on the optical properties of Ge2oSe8othinfilms prepared by vac-uum evaporation as radiated by (0,34,69) Gy of 13 ray.The optical band gab Eg and tailing band A.Et were studied in the photon energy range ( 1 to 3)eV. The a-Ge20Se8o film was found to be indirect gap with energy gap of (1.965,1.9 , 1.82) eV at radiated by B ray with absorption doses of (0,34,69)Gy respectively.The Ea and AEt of Ge20Se80 films showed adecrease in E8 and an increase in AEt with radiation. This be-havior may be related to structural defects and dangling bonds.

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Article
Using He-Ne laser irradiation for enhancing cartilage Autografts
استخدمت في هذه الدراسة 30 ارنبا نيوزلنديا بالغا تم تقسيمها الى مجموعتين متساويتين

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thirty adult NewZealand rabbits used in this study, they were divided in to two groups (control and treaded with Helium — Neon laser). A square skin flap done on the medial aspect of the auricle of both sides, a square piece of cartilage incised, pealed out from each auricle and fixed in the site of the other, then the flaps sutured .The site of the operation in the rabbits of the treated group were irradiated using a Helium —Neon laser with (5mw) power for (10 days) began after the operation directly, (3 rabbits) from each group used for collection of specimens for histopathological examination at the weeks (1,2,3,4, & 6) weeks post the operation .The results revealed Early invasion of the matrix with elastic fibers which continue to the surrounding perichondrium, mature lacunae and complete healing occurred later at the 6th week in the treated group. Conclusion: Helium- Neon laser raised the mitotic activity of the cartilage cells, activated the reproduction processes in addition to the intra and extra regenerative reparation.

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Article
Evaluation of the one electron expeetation values for different wave functions
حساب القيمة المتوقعة للالكترون المفرد والدوال موجية مختلفة

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The aim of this work is to evaluate the onc-electron expectation values < r > from the radial electronic density funetion D(r) for different wave ؛'unctions for the 2s state of Li atom. The wave functions used were published in 1963,174و and 1993 , respectavily. Using " " ' wave function as a Slater determinant has used the positioning technique for the analysis open shell system of Li (Is2 2s) State.

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Article
B-splines Algorithms for Solving Fredholm Linear Integro-Differential Equations
خوارزمياتB-splines لحل معادلات فريدهولم الخطية المتكاملة

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Algorithms using the second order of B -splines [B (x)] and the third order of B -splines [B,3(x)] are derived to solve 1' , 2nd and 3rd linear Fredholm integro-differential equations (F1DEs). These new procedures have all the useful properties of B -spline function and can be used comparatively greater computational ease and efficiency.The results of these algorithms are compared with the cubic spline function.Two numerical examples are given for conciliated the results of this method.

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Article
First Order Nonlinear Neutral Delay Differential Equations
المعادلات التفاضلية المحايدة غير الخطية من الرتبة الاولى

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The author obtain results on the asymptotic behavior of the nonoscillatory solutions of first order nonlinear neutral differential equations. Keywords. Neutral differential equations, Oscillatory and Nonoscillatory solutions.

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Article
Numerical Solution of Linear integro-ordinary Differential Equations Using Taylor Series
الحل العددي لمعادلات تفاضلية - تكاملية خطية باستخدام متسلسلة تايلر

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Taylor series is applied to treat two types of higher order linear integro-ordinary differential equations: linear Fredholm and Volterra integro-ordinary differential. In this technique Taylor series is substituted for the unknown function after differentiating both sides of linear integro-ordinary 1ئاةلآظأ؛ل equation with respect to X. The required derivatives and the involved integrals have been approximated using central differences and quadrature rules respectively. The resulting algebraic equations are solved by Gauss elimination technique. Program is written in MATLAB language and examples are presented to illustrate the results of this method.

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