A. A. Badr

A. A. Badr

Alexandria University

H-index: 10

Africa-Egypt

Professor Information

University

Alexandria University

Position

Associate Professor in Pure Mathematics Faculty of Science Egypt

Citations(all)

344

Citations(since 2016)

130

Cited By

308

hIndex(all)

10

hIndex(since 2016)

7

i10Index(all)

10

i10Index(since 2016)

3

Email

University Profile Page

Alexandria University

Research & Interests List

Pure Math

Top articles of A. A. Badr

Genetic Components for Milk Production and it is Composition Estimated by Using Sire and Animal Models in A Herd of Friesian Cows

A total number of  eighty seventy four Friesian cows which, kept at  Sakha and El–Karda farms, from 1996 to 2002  are used to estimate  heritability (h2) , phenotypic (rp) and genetic correlations (rg) among three months and 305 day milk yield traits by using sire model (SM) and animal model (AM). The SM includes the random effects of bull and cows within bulls and main effects of  herd year season, and lactation number and days open as a regression. The animal model includes the main effects of  herd year season and lactation number and days open as a regression and random effects of animals, permanent and errors.Estimates of h2 of milk   yield traits for sire models  are  moderate and between from  f0.116 to 0.264 as calculated from sire components and from 0.036 to 0.068 from dam components, while the h2  for milk traits from AM ranged from 0.046 to 0.062. Genetic correlations between milk production traits are  positive, high and near similar for  SM and AM and between from 0.88 to 0.99. The high estimates of genetic correlation in the present study offer the possibility to select for yield traits as early ages, .i.e., at 90 days of lactation. Also, this study indicate that, using of SM is useful when a, small number of observations and little pedigree information is available.

Authors

HG El-Awady,Anas A Badr,AS Khattab,EZ Oudah

Journal

Journal of Animal and Poultry Production

Publish By

Mansoura University, Faculty of Agriculture

Publish Date

2020/3/1

Initial value problem for stochastic hybrid Hadamard fractional differential equation

Authors

MM El-Borai,WG El-Sayed,AA Badr,SA Tarek

Journal

J. Adv. Math

Publish Date

2019

Two numerical methods for Abel's integral equation with comparison

Analogy between Abel’s integral equation and the integral of fractional order of a given function, jαf (t), is discussed. Two different numerical methods are presented and an approximate formula for jαf (t) is obtained. The first approach considers the case when the function, f (t), is smooth and a quadrature formula is obtained. A modified formula is deduced in case the function has one or more simple pole. In the second approach, a procedure is presented to weaken the singularities. Both two approaches could be used to solve numerically Abel’s integral equation. Some numerical examples are given to illustrate our results.

Authors

Abdallah Ali Badr

Journal

Revue Africaine de Recherche en Informatique et Mathématiques Appliquées

Publish By

Episciences. org

Publish Date

2012/8/26

Virulence of Ralstonia solanacearum the causal of potato brown rot disease under Egyptian conditions

Ten isolates of Ralstonia solanacearum bacterium were isolated from potato tubers and soil samples which were collected from Qalubiya and Beheira governorates. The obtained isolates were identified initially according to their morphological, physiological and biochemical characteristics then, immunofluorescent antibody stains (IFAS) and polymerase chain reaction (PCR) techniques were used to confirm the identification of R. solanacearum bacterium. All tested isolates caused symptoms of bacterial wilt disease on potato plants compared with the un-inoculated control with superiority of R. solanacearum (R6) which recorded the highest percentage of infection and disease severity of brown rot disease at 35 day post inoculation the sterilized soil with brown rot pathogens. All tested potato cultivars were susceptible to infect with R. solanacearum when cultivated in sterilized soil and un-sterilized soil. In the sterilized soil, isolate R6 recorded the highest percentage of infection and disease severity on cvs. Gelabica and Cara whereas, the isolates R2 and R1 were the most virulent on cvs. Barren and Spunta, respectively. However, isolate R6 on cvs. Gelabica and isolate R4 on Cara, and R3 on Barren and R4 on Spunta recorded the highest disease severity in the un-sterilized soil.

Authors

AM Mahdy,GM El-Habbaa,FG Mohamed,AA Badr

Journal

Annals of Agricultural Science Moshtohor

Publish Date

2012

On the solution of a functional integral equation of Fredholm type with degenerate kerenel

Here, the existence and the uniqueness of the solution of a class of a nonlinear integral equation with discontinuous kernel are discussed and proved. A degenerate kernel method is used, as a numerical method, to obtain a class of a system of a nonlinear algebraic equations. Many important theorems related to the existence and uniqueness of the produced algebraic system are derived. Finally, numerical examples are discussed and the error estimate, in each case, is calculated.

Authors

Abdallah Ali Badr

Journal

Life Science Journal

Publish Date

2012

Finite element method for linear multiterm fractional differential equations

We consider the linear multiterm fractional differential equation (fDE). Existence and uniqueness of the solution of such equation are discussed. We apply the finite element method (FEM) to obtain the numerical solution of this equation using Galerkin approach. A comparison, through examples, between our techniques and other previous numerical methods is established.

Authors

Abdallah A Badr

Journal

Journal of Applied Mathematics

Publish By

Hindawi

Publish Date

2012/1/1

Monte-Carlo Galerkin approximation of fractional stochastic integro-differential equation

A stochastic differential equation, SDE, describes the dynamics of a stochastic process defined on a space-time continuum. This paper reformulates the fractional stochastic integro-differential equation as a SDE. Existence and uniqueness of the solution to this equation is discussed. A numerical method for solving SDEs based on the Monte-Carlo Galerkin method is presented.

Authors

Abdallah Ali Badr,Hanan Salem El-Hoety

Journal

Mathematical Problems in Engineering

Publish By

Hindawi

Publish Date

2012/1/1

Comparative study on efficacy of different medicaments on postpartum anestrus dairy cows

The aim of the present investigation was aimed to evaluate the comparative study efficacy of different medicaments on postpartum anestrus dairy cows. The study was conducted on forty eight Friesian cows. The true anestrous cows (Experiment 1, n=32) were randomly allocated into four equal groups of 8 cows each according to the design of treatment; group 1served as a control without treatment; group2 received progesterone (CIDR for 10 days plus i.m. injection of 2ml Estrumate (PGF2α); group 3 received Lugol᾽s iodine solution and massage; group 4 treated with one injection of GnRH. The suboestrus cows (experiment 2, n=16) were divided into two equal groups. Group 1served as a control without treatment (n=8); group2 (PGF2α group, n=8) were treated by one injection of 2ml Estrumate (synthetic PGF2α). Fertility measures including the incidence, the mean interval between ends of the treatment to onset of estrus, the number of service per conception and pregnancy rates were recorded. Results showed that, the highest incidence of estrus (87.5%) and pregnancy rates (85.7%) were achieved with treatment of CIDR followed by Lugol᾽s solution plus massage and GnRH treatment regime where, the incidence of the estrus and pregnancy rates were (62.5,50.0;50.0, 40.0%, respectively). One of the eight control animals in treatment came into heat (12.5%) at an average post treatment interval of 480.0±22.4 hours and no animal was pregnant. The incidences of estrus and pregnancy rates of suboestrus cows after PGF2α treatment were 87.5% and 71.42%, respectively. While, in control group (experiment 2) no animal came in heat or …

Authors

KH El-Shahat,A Badr

Journal

Journal of Applied Biological Sciences

Publish By

Nobel Bilim ve Araştırma Merkezi Limited

Publish Date

2011/9/1

academic-engine

Useful Links