In this paper, the dynamics of a three species food web model consisting of
producers, primary consumers and omnivory is studied analytically as well as
numeri-cally. The existence of equilibrium points and local stability analysis
for this model is carried out together with a bifurcation analysis. The
occurrence of hopf bifurcation is also investigated. The persistence conditions
of the food web model are established by using average Lyapunov function.
The global stability analysis of the food web model is also presented with help
of Lyapunov method. Finally, in order to confirm our analytical results,
numerical simulation is carried out for suitable choices of parameters values. It
is observ

     The behavior of rare earth elements (REE) in phosphate coprolites; deposited in marine upwelling shelf system (Iraq) and a condensed section of the intracontinental basin (Czech Republic) is compared and discussed in the present study. The eight coprolite samples show that the REE incorporated in the apatite of these phosphatized faecal trace fossils have significantly different behavior in the two sedimentary regimes and hold the REE source’s signature in the local sedimentary conditions. The behavior of heavy REE, light REE, Ce-anomaly and shale-normalized ratios of Ce/La, Sm/Yb and Pr/Ce can be mainly attributed to REE fractionation at the source. In contrast, middle REE enrichment may be attributed to local fractionation b

The aquatic Heptageniidae family of Ava-sheen branch (Greater Zab Tributary) in Duhok Governorate/ Iraq was studied. Samples were collected using Surber stream sampler to study their diagnostic morphological characteristics and molecular phylogenetic profile using a nuclear gene 16s ribosomal RNA. The morphological and molecular identification supported that the three species, Epeorus longimanus, Heptagenia elegantula and Ephemerella cornutus belong to Heptageniidae family, while the molecular results also confirmed the monophyletic origin of these three genera.

Let  be a prime ring,  be a non-zero ideal of  and   be automorphism on. A mapping  is called a multiplicative (generalized)  reverse derivation if  where  is any map (not necessarily additive). In this paper, we proved the commutativity of a prime ring R admitting a multiplicative (generalized)  reverse derivation  satisfying any one of the properties:

 for all x, y  

Ad'Daimah Field is a structural trap with a proven gas condensate reservoir in limestone. The Yamama Formation is the faulted anticline that makes up the field. Thirteen seismic lines were used for this study, with one well (Da-1). Velocity maps derived from the velocity model were used to construct time and depth maps. Certain stratigraphic features were present in the examined reflector, according to seismic interpretation in the region. In the research area, certain distribution mounds and continuous sand lenses in more than two-dimensional seismic lines were seen. These activity components offer a logical justification for the distribution of hydrocarbons in the study region. The major normal fault of (NW-SE) trending and minor norma

يتناول البحث أثر التلفاز على الإنسان، هذا الوسيط الفعّال بين وسائط الميديا المتعددة الأخرى، وهي من القضايا المهمة في العصر الراهن، لما للتلفاز من آثار إيجابية وسلبية على الإنسان استدعت البحث فيه.

يركز البحث على شخصيتين من فرنسا، تُعتبر أفكارهما من أهم الأفكار التي طُرحت في هذا المجال، هما: بيير بورديو وريجيس دوبري. كما يعقد البحث مقارنة بين أفكارهما، عبر اعتماد المنهج المقارن، لمعرفة مواطن التقارب وال

يشكل الخطاب الشعري القديم تراثا ضخما يفخر العرب به وبكل ما فيه ، لكونه يكشف لا شك عن نبوغهم وتفردهم بالادبية الفذة التي عزّ نظيرها بين الامم آنذاك . من جهة اخرى شكّل هذا الخطاب وعيا جمعيا لدى الأمة تمحور في اتجاهين سياسي واخر عقدي. إنّ أول من هله ل الشعر وجعله قصيد هو عديّ بن ربيعة التغلبيّ )ت 49 ق.ه / 131م(، ولذا سُمّي المهلهل، ولعل أشهر ما قيل على لسان هذا الشاعر مرثيته الثأرية التي يقول فيها:

يال

The purpose of the present paper is to define the minerals content in the Najaf Dunes fields and the origin of these sand sediments in the southwestern parts of Iraq. There are three types of dunes in this field were described, the barchan, longitudinal, and dome dunes and additional types e.g. Nabkha, Barchanoid ridges, and sand sheet dunes. The study area was divided into three areas according to the geographical position, and numerous samples were collected from this field.

The mineralogical study consists from three methods these are; the first: separation of sand samples into the light and heavy minerals by heavy liquids,where performed on 30 samples. The second method; carbonate content performed on 60 samples, and the thir

The research included anatomical study of nine wild species of the genus
Athionema R.BR. from BrassicaceA family in Iraq, and these species are:
A.arabicum (L.), A.carneum (Banks et sol.),A. cordifolium (DC.), A.fimbriatum
(Boiss.),A. froedinii (Rech. F.), A. speciosum (Boiss. et Huet), A. syriacum
(Boiss.),A. grandiflorum (Boiss. et Hoh.) , A.trinervium (D.C.).The research
covered the anatomical characteristic of the leaf Epidermis as well as leaves
venation, also transvers sections for leaves were studied ,and revealed that some
anatomical characteristics have taxonomic importance in distinguishing the species.
This research also showed the presence of important variations in internal charecters
for leaves an

The present study deals with the biostratigraphy and depositional environment of
(Late Turonian – Early Campanian) represent dy Khasib, Tanuma and Saadi
Formations in well Agel -12- Northeastern Tikrite. Determination of three
microfacies in Khasib, one microfacies in Tanuma and three microfacies in Saadi
Formations. Depending on microfacies the paleoecologe of Khasib Middle shelf –
Upper Bathyal environment, Tanuma Shelf Margin environment and Saadi
Formations sediment in Middle shelf – Upper Bathyal. Twenty planktic foraminiferal species belonging to eight genera have been identified within the
studied well.
Depending on the stratigraphic distribution of planktic foraminiferal species, the
succession wa

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In this paper an accurate Indian handwritten digits recognition system is
proposed. The system used three proposed method for extracting the most effecting
features to represent the characteristic of each digit. Discrete Wavelet Transform
(DWT) at level one and Fast Cosine Transform (FCT) is used for features extraction
from the thinned image. Besides that, the system used a standard database which is
ADBase database for evaluation. The extracted features were classified with KNearest
Neighbor (KNN) classifier based on cityblock distance function and the
experimental results show that the proposed system achieved 98.2% recognition
rate.

In this paper,a prey-predator model with infectious disease in predator population
is proposed and studied. Nonlinear incidence rate is used to describe the transition of
disease. The existence, uniqueness and boundedness of the solution are discussed.
The existences and the stability analysis of all possible equilibrium points are
studied. Numerical simulation is carried out to investigate the global dynamical
behavior of the system.

The Pila Spi Formation (middle – late Eocene) was studied in terms of field character, Petrography and geochemistry from two outcrops (Bakhar and Bani bawy) sections, Northern Iraq. The field studies showing massive, lithified limestone to marly limestone high effected by dolomitization. The petrography studies shows that most of the skeletal grains was destroyed due to digenetic processes specifically the dolomitization, and the vast majority of carbonate rocks are mudstone and few beds of wackestone. The geochemical study reveals low CaO% and high MgO% content due to the intense effect of dolomitization, and the carbonate rocks was classified as impure limestone generally of slightly calcareous dolomite. Ca/Mg and Sr/Ca ratios have b

With the development of information technology and means for information transfer it has become necessary to protect sensitive information. The current research presents a method to protect secret colored images which includes three phases: The first phase calculates hash value using one of hash functions to ensure that no tampering with or updating the contents of the secret image. The second phase is encrypting image and embedding it randomly into appropriate cover image using Random Least Significant Bit (RLSB) technique. Random hiding provides protection of information embedded inside cover image for inability to predict the hiding positions, as well as the difficult of determining the concealment positions through the analysis of im

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The effect of (Di-Ammonium Phosphate DAP) (P21%), as plant fertilizer on content of the Saliva officinalis. Total flavonoid as an important active constituent was investigated in the present study. Three samples (F1, F2, and F3) of Saliva officinalis were grown in soil treated with DAP (100, 200, and 300) kg/hector respectively. Another two samples were studied: F0 as a plant sample grown in soil untreated with fertilizer and F4 as wild type obtained from market. Total flavonoids were estimated Quantitatively by Rutin standard curve and qualitatively by TLC method in corresponding to standard flavonoids. Results showed that different concentrations of DAP treated soil affected flavonoid contained of the Iraqi cultivated Saliva officinali

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This paper presents a minimum delay congestion control in differentiated Service communication networks. The premium and ordinary passage services based fluid flow theory is used to build the suggested structure in high efficient manage. The established system is capable to adeptly manage both the physical network resource limitations and indefinite time delay related to networking system structure.

The seedlings of vegetables are exposed to stress states, especially through the first period, due to injuring their roots by transplanting or heavy rain , so it is necessary to provide an available nutrient to recover the growth and increase their early yield, which means more income for farmers. In this regard, an experiment was conducted in the College of Agricultural Engineering Sciences, Agriculture Faculty, University of Baghdad, Iraq to study the effect of different types and concentrations of mineral fertilizers as starter solutions by using high nitrogen (N), high phosphorus (P) and neutral fertilizers (Q) at three levels which were 4 g/l (S1), 8 g/l (S2) and 12 g/l (S3) on broccoli growth and yield. The results showed tha