40 results on '"MOSTAFA, A. O."'
Search Results
2. A Unified Presentation of Subclasses of Analytic p-Valent Functions with Negative Coefficients.
- Author
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Mostafa, A. O., Aouf, M. K., and Aljuboori, O. M.
- Subjects
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INTEGRAL operators , *COEFFICIENTS (Statistics) , *ANALYTIC functions - Abstract
In this paper, we define the general class Hp (λ, α, γ) of analytic and p-valent functions with negative coefficients. We investigate various important properties and characteristies of this class. Also, modified Hadamard products for functions in this class are obtained. Finally, a family of integral operators is considered [ABSTRACT FROM AUTHOR]
- Published
- 2024
3. P-VALENTLY BAZILEVIČ FUNCTIONS DEFINED WITH HIGHER ORDER DERIVATIVES.
- Author
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Aouf, Mohamed K., Mostafa, Adela O., and Bulboacă, Teodor
- Abstract
The object of this paper is to derive various properties and characters for a class of p-valently Bazilevič functions defined with higher order derivatives. Using the technique of Briot-Bouquet differential subordination we obtained several results, some of them presented here generalize and improve a few earlier results, and several others are new ones involving differential inequalities. These last implications deal with the symmetric open disc and symmetric conic domains with respect to the real axe. Our results extends and improves many other previous ones, and some of them are the best possible under the given assumptions. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. Fekete-Szegö Results for Certain Class of Non-Bazilevič Functions Involving Linear Operator.
- Author
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Mostafa, A. O. and El-Hawsh, G. M.
- Subjects
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SCHWARZ function , *LINEAR operators - Abstract
In this paper, by using the principal of subordination, we obtain sharp bounds for certain class of non-Bazilevič functions involving linear operator. [ABSTRACT FROM AUTHOR]
- Published
- 2023
5. Coefficient Bounds for Multivalent Classes of Starlike and Convex Functions Defined by Higher-Order Derivatives and Complex Order.
- Author
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Aouf, M. K., Mostafa, A. O., and Bulboacă, T.
- Subjects
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STAR-like functions , *CONVEX functions , *DIFFERENTIAL equations - Abstract
We establish coefficient bounds for functions from the subclasses of p-valent starlike and p-valent convex functions defined by higher-order derivatives and complex order introduced with the help of a certain nonhomogeneous Cauchy–Euler differential equation with higher-order derivatives. Relevant connections of some of our results with the results obtained earlier are provided. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
6. SUBORDINATING RESULTS FOR A CLASS OF ANALYTIC FUNCTIONS DEFINED BY HADAMARD PRODUCT AND ATSHAN AND RAFID OPERATOR.
- Author
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Aouf, M. K., Mostafa, A. O., and Al-Quhali, F. Y.
- Abstract
In this paper, we defined a class of analytic functions defined by Hadamard product and Atshan and Rafid operator and obtained some subordinating results for functions in this class. [ABSTRACT FROM AUTHOR]
- Published
- 2021
7. Class of meromorphic univalent functions with positive coefficients associated with a generalized q-Sălăgean operator.
- Author
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Aouf, M. K., Mostafa, A. O., and Al-Quhali, F. Y.
- Abstract
In this paper, using q − derivative operator, we define the class Σ q , v ∗ (n , α , β , λ) of meromorphic univalent functions and obtain coefficient estimates, distortion, closure theorems, modified Hadamard products, some radii for functions in this class and family of integral operators. Further, we determine partial sums results. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
8. Certain inequalities of meromorphic univalent functions associated with the Mittag-Leffler function.
- Author
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Aouf, Mohamed K. and Mostafa, Adela O.
- Subjects
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MEROMORPHIC functions , *UNIVALENT functions , *DIFFERENTIAL inequalities , *MATHEMATICAL equivalence - Abstract
The purpose of this paper is to prove differential inequalities for meromorphic univalent functions by using a new operator associated with the Mittag-Leffler function. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
9. Some Properties of Uniformly Starlike and Convex Hypergeometric Functions.
- Author
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Aouf, M. K., Mostafa, A. O., and Zayed, H. M.
- Subjects
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HYPERGEOMETRIC functions , *STAR-like functions , *CONVEX functions - Abstract
The purpose of this paper is to introduce some characterizations of (Gaussian) hypergeometric function to be in various subclasses of uniformly starlike and uniformly convex functions. Operators related to hypergeometric functions are also considered. Some of our results correct previously known results. [ABSTRACT FROM AUTHOR]
- Published
- 2019
10. BASIC AND FRACTIONAL q-CALCULUS AND ASSOCIATED FEKETE-SZEGŐ PROBLEM FOR p-VALENTLY q-STARLIKE FUNCTIONS AND p-VALENTLY q-CONVEX FUNCTIONS OF COMPLEX ORDER.
- Author
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SRIVASTAVA, H. M., MOSTAFA, A. O., AOUF, M. K., and ZAYED, H. M.
- Subjects
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ANALYTIC functions , *UNIVALENT functions , *MATRIX derivatives , *STAR-like functions , *COMPLEX variables , *CONVEX functions , *CALCULUS , *MATHEMATICAL analysis - Abstract
In this paper, we introduce and study some subclasses of p-valently analytic functions in the open unit disk U by applying the q-derivative operator and the fractional q-derivative operator in conjunction with the principle of subordination between analytic functions. For the Taylor-Maclaurin coefficients ... of each of these subclasses of p-valently analytic functions, we derive sharp bounds for the Fekete-Szegő functional given by ... Relevant connections of the results presented in this paper with those derived in earlier works are also considered. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
11. Fekete-Szegö results for a class of non-Bazilevič functions defined by convolution.
- Author
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Mostafa, A. O. and El-Hawsh, G. M.
- Subjects
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MATHEMATICAL convolutions , *ANALYTIC functions - Abstract
In the present paper using the principal of subordination we obtain sharp bounds for a class of non-Bazilevič functions with complex order defined by convolution. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
12. Fekte-Szegö Result for Classes of p-Valent Functions Defined by Convolution.
- Author
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Aouf, M. K. and Mostafa, A. O.
- Subjects
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SET theory , *MATHEMATICAL convolutions , *MATHEMATICAL bounds , *SCHWARZ function , *MATHEMATICAL equivalence - Abstract
In this paper using the principal of subordination we obtain sharp bounds for some classes of p-valent functions defined by convolution. [ABSTRACT FROM AUTHOR]
- Published
- 2017
13. Partial Sums for Certain Subclass of Meromorphic Univalent Functions.
- Author
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Aouf, M. K., Mostafa, A. O., Lashin, A. Y., and Munassar, B. M.
- Subjects
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PARTIAL sums (Series) , *DERIVATIVES (Mathematics) , *CONVEX functions , *MEROMORPHIC functions , *STAR-like functions - Abstract
In this paper, the class ∑λ (α, β γ,;) of univalent meromorphic functions de- fined by Ruscheweyh derivative in the punctured unit disk U* is introduced. We study some results concerning the partial sums of meromorphic univalent starlike functions and meromorphic univalent convex functions. [ABSTRACT FROM AUTHOR]
- Published
- 2017
14. SOME FAMILIES OF UNIFORMLY STARLIKE AND CONVEX FUNCTIONS WITH NEGATIVE COEFFICIENTS.
- Author
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Aouf, Mohamed K., Mostafa, Adela O., and Algubouri, Omar M.
- Subjects
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STAR-like functions , *HADAMARD matrices - Abstract
We introduce a subclass of uniformly starlike and convex functions with negative coefficients defined by Sălăgean operator. In this paper, we obtain coefficient estimates, distortion theorems, closure theorems and radii of close-to-convexity, starlikeness, and convexity for functions belonging to this class. Several results for the modified Hadamard products of functions belonging to this class are obtained. Finally, distortion theorems for fractional calculus functions are also considered. [ABSTRACT FROM AUTHOR]
- Published
- 2016
15. QUASI-SUBORDINATION AND FEKETE-SZEGÖ PROBLEM FOR P-VALENT FUNCTIONS WITH HIGHER ORDER DERIVATIVES OF COMPLEX ORDER.
- Author
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Aouf, Mohamed K., Mostafa, Adela O., and Zayed, Hanaa M.
- Subjects
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UNIVALENT functions , *COMPLEX variables - Abstract
In this paper, we obtain Fekete-Szegö functional ∣ap+2 - μa2p+1∣ for functions of the class Mm,λb,p,q(g, φ). Sharp bounds for the Fekete-Szegö functional ∣ap+2 - μa2p+1∣ are obtained. [ABSTRACT FROM AUTHOR]
- Published
- 2016
16. Goodman-Rønning-Type Multivalent Harmonic Functions Based on Dziok-Srivastava Operator.
- Author
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Mostafa, A. O. and Aouf, M. K.
- Subjects
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HARMONIC functions , *COEFFICIENTS (Statistics) , *MATHEMATICAL bounds , *SET theory , *OPERATOR theory - Abstract
In this paper, a class of Goodman-Rønning-type multivalent harmonic functions based on Dziok-Srivastava operator is considered. Coefficient bounds, representation theorem, distortion and extreme points for functions of this class are obtained. [ABSTRACT FROM AUTHOR]
- Published
- 2015
17. Certain Subclass of p-Valent Meromorphic Functions Associated with Linear Operator.
- Author
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MOSTAFA, A. O., AOUF, M. K., SHAMANDY, A., and ADWAN, EMAN AHMED
- Subjects
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LINEAR operators , *VECTOR algebra , *MATHEMATICAL analysis , *NUMERICAL analysis , *MATHEMATICAL functions - Abstract
In this paper, we introduce a class of p-valent meromorphic functions associated with linear operator and derive several interesting results of this class. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
18. ON CONVOLUTION PROPERTIES FOR SOME CLASSES OF MEROMORPHIC FUNCTIONS ASSOCIATED WITH LINEAR OPERATOR.
- Author
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MOSTAFA, A. O. and AOUF, M. K.
- Subjects
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MATHEMATICAL convolutions , *MEROMORPHIC functions , *VALUE distribution theory , *LINEAR operators , *OPERATOR theory , *SET theory - Abstract
In this paper, we defined two classes S*p(n, λ, A, B) and Kp(n, λ, A, B) of meromorphic p-valent functions associated with a new linear operator. We obtained convolution properties for functions in these classes. [ABSTRACT FROM AUTHOR]
- Published
- 2015
19. Argument Estimates of Certain Meromorphically p-Valent Functions Defined by a Linear Operator.
- Author
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Mostafa, A. O. and Aouf, M. K.
- Subjects
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MEROMORPHIC functions , *LINEAR operators , *INTEGRALS , *MATHEMATICS theorems , *ANALYTIC functions - Abstract
Making use of the linear operator Dλ,pm, we obtain some argument properties of meromorphically p-valent functions. Also, we derive the integral preserving properties in a sector. [ABSTRACT FROM AUTHOR]
- Published
- 2013
20. Differential sandwich theorems for some analytic functions defined by certain linear operators.
- Author
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Aouf, M. K. and Mostafa, A. O.
- Subjects
- *
MATHEMATICS theorems , *MULTIPLIERS (Mathematical analysis) , *ANALYTIC functions , *SCHWARZ function , *MATHEMATICAL equivalence - Abstract
In this investigation, we obtain some applications of first order differential subordination and superordination results involving the multiplier transformation and Al-Oboudi operator for certain normalized analytic functions in the open unit disc. [ABSTRACT FROM AUTHOR]
- Published
- 2012
21. Certain classes of p-valent functions defined by convolution.
- Author
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Aouf, M. K. and Mostafa, A. O.
- Subjects
- *
MATHEMATICAL convolutions , *STAR-like functions , *ANALYTIC functions , *CONVEX functions , *INTEGRAL closure - Abstract
Making use of a differential operator and a given p-valent analytic function g the authors introduce and study two new classes TCg (p, q, n, α) and TCg (p, q, n,α) of p-valent analytic functions with negative coefficients. They also indicate relevant connections of these classes with sevesral other families of multivalent functions which were studied by earlier workers as well as new. [ABSTRACT FROM AUTHOR]
- Published
- 2012
22. Some Sandwich Theorems for Certain Analytic Functions Defined by Convolution.
- Author
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Aouf, M. K. and Mostafa, A. O.
- Subjects
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DIFFERENTIAL calculus , *CALCULUS , *DIFFERENTIAL equations , *MATHEMATICAL convolutions , *MATHEMATICAL functions , *INTEGRALS , *MATHEMATICAL analysis , *MATHEMATICS , *NUMERICAL analysis - Abstract
Abstract. In this paper, we obtain some applications of first order differential subordination and superordination results for some analytic functions defined by convolution. [ABSTRACT FROM AUTHOR]
- Published
- 2010
23. Sandwich Theorems for Some Analytic Functions Defined by Convolution.
- Author
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Mostafa, A. O., Bulboacă, T., and Aouf, M. K.
- Subjects
- *
ANALYTIC functions , *DIFFERENTIAL equations , *INTEGRAL theorems , *MATHEMATICAL convolutions , *SCHWARZ function , *INTEGRAL operators , *LINEAR operators , *CONVEX functions , *MATHEMATICS - Abstract
For certain analytic functions defined by convolution products, we obtain several applications of first order differential subordination and superordination, that generalize some previous results obtained by different authors. [ABSTRACT FROM AUTHOR]
- Published
- 2010
24. ARGUMENT ESTIMATES FOR CERTAIN ANALYTIC FUNCTIONS.
- Author
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CHO, N. E., AOUF, M. K., and MOSTAFA, A. O.
- Subjects
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STAR-like functions , *UNIVALENT functions , *CONVEX functions , *ARGUMENT , *ANALYTIC functions , *ESTIMATES - Abstract
The purpose of the present paper is to investigate some argument properties for certain analytic functions in the open unit disk. The main results presented in here generalize some previous those concerning starlike function of reciprocal of order beta and strongly starlike functions. [ABSTRACT FROM AUTHOR]
- Published
- 2021
25. Mapping Properties for Convolution Involving Hypergeometric Series.
- Author
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Aouf, M. K., Mostafa, A. O., and Zayed, H. M.
- Abstract
We introduce sufficient conditions for (Gaussian) hypergeometric functions to be in a subclass of analytic functions. In addition, we investigate several mapping properties for convolutions and integral convolutions involving hypergeometric functions. [ABSTRACT FROM AUTHOR] - Published
- 2019
- Full Text
- View/download PDF
26. Certain sufficient conditions for close-to-convexity and starlikeness of multivalent functions.
- Author
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AOUF, MOHAMED K., BULBOACĂ, TEODOR, and MOSTAFA, ADELA O.
- Subjects
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STAR-like functions , *ANALYTIC functions , *CONVEX functions - Abstract
By using Jack's lemma, we derive simple sufficient conditions for analytic functions to be multivalent close-to-convex and multivalent starlike. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
27. SOME PROPERTIES OF ANALYTIC FUNCTIONS ASSOCIATED WITH FRACTIONAL q-CALCULUS OPERATORS.
- Author
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SRIVASTAVA, H. M., AOUF, M. K., and MOSTAFA, A. O.
- Subjects
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ANALYTIC functions , *FRACTIONAL calculus , *CONVEX functions , *STAR-like functions , *GAMMA functions - Abstract
By applying a fractional q-calculus operator, we define the subclasses Snα(γ, β, b, q)and Gnα(γ, β, b, q) of normalized analytic functions with complex order and negative coefficients. Among the results investigated for each of these function classes, we derive their associated coefficient estimates, radii of close-to-convexity, starlikeness and convexity, extreme points, and growth and distortion theorems. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
28. Subordination results for certain classes of analytic functions defined by Dziok-Srivastava operator.
- Author
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Aouf, M. K., Shamandy, A., Mostafa, A. O., and Adwan, E. A.
- Subjects
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ANALYTIC functions , *MATHEMATICAL functions , *MATHEMATICS education - Abstract
In this paper, we drive several interesting subordination results of a certain classes of analytic functions defined by Dziok-Srivastava operator. [ABSTRACT FROM AUTHOR]
- Published
- 2014
29. Some Properties for Certain Subclass of p-Valent Analytic Functions Defined Using Convolution.
- Author
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Aouf, M. K., Shamandy, A. A., Mostafa, A. O., and Wagdy, A. K.
- Subjects
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MATHEMATICAL convolutions , *DISTRIBUTION (Probability theory) , *MATHEMATICAL functions , *ANALYTIC functions , *SCHWARZ function - Abstract
In this paper, we introduce a new subclass of analytic p-valent functions defined using convolution and investigate many properties of functions of this class using Jack's lemma. [ABSTRACT FROM AUTHOR]
- Published
- 2013
30. Sandwich Results for Certain Subclasses of Multivalent Analytic Functions Defined by Srivastava-Attiya Operator.
- Author
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Aouf, M. K., Shamandy, A., Mostafa, A. O., and Adwan, Eman A.
- Subjects
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SET theory , *ANALYTIC functions , *OPERATOR theory , *ORDINATION (Statistics) , *DIFFERENTIAL equations , *MATHEMATICS , *MATHEMATICAL analysis - Abstract
In this paper, we obtain some applications of first order differential subordination and superordination results involving the operator Due to image rights restrictions, multiple line equation(s) cannot be graphically displayed for certain normalized p-valent analytic functions associated with that operator. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
31. On Certain Subclasses of Meromorphically p-Valent Functions Associated with Integral Operators.
- Author
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Aouf, M. K., Shamandy, A., Mostafa, A. O., and El-Emam, F. Z.
- Subjects
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MEROMORPHIC functions , *INTEGRAL operators , *SCHWARZ function , *GAMMA functions , *ANALYTIC functions , *APPLIED mathematics - Abstract
The object of the present paper is to introduce and study new classes of meromorphically p-valent functions associated with the integral operators Pβpα and Qβpα. [ABSTRACT FROM AUTHOR]
- Published
- 2011
32. SUBORDINATION RESULTS FOR CERTAIN CLASSES OF ANALYTIC FUNCTIONS DEFINED BY CONVOLUTION WITH COMPLEX ORDER.
- Author
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AOUF, M. K., SHAMANDY, A., MOSTAFA, A. O., and ADWAN, E. A.
- Subjects
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ANALYTIC functions , *TAYLOR'S series , *COMPLEX variables , *MATHEMATICAL convolutions , *DISTRIBUTION (Probability theory) - Abstract
In this paper, we drive several interesting subordination results of certain classes of analytic functions defined by convolution with complex order. [ABSTRACT FROM AUTHOR]
- Published
- 2011
33. Subordination properties of p-valent functions defined by Sălăgean operator.
- Author
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Aouf, M. K., Bulboacă, T., and Mostafa, A. O.
- Subjects
- *
DIFFERENTIAL operators , *DIFFERENTIAL equations , *MATHEMATICAL analysis , *MATHEMATICAL functions , *MATHEMATICS - Abstract
In this article, we introduce and investigate various properties of a certain class of analytic p-valent functions defined by using the Sălăgean differential operator and sharp subordination results. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
34. Magnetic Refrigeration Design Technologies: State of the Art and General Perspectives.
- Author
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Alahmer, Ali, Al-Amayreh, Malik, Mostafa, Ahmad O., Al-Dabbas, Mohammad, and Rezk, Hegazy
- Subjects
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MAGNETIC cooling , *MAGNETIC materials , *MAGNETOCALORIC effects , *THERMODYNAMIC cycles , *COST analysis - Abstract
Magnetic refrigeration is a fascinating superior choice technology as compared with traditional refrigeration that relies on a unique property of particular materials, known as the magnetocaloric effect (MCE). This paper provides a thorough understanding of different magnetic refrigeration technologies using a variety of models to evaluate the coefficient of performance (COP) and specific cooling capacity outputs. Accordingly, magnetic refrigeration models are divided into four categories: rotating, reciprocating, C-shaped magnetic refrigeration, and active magnetic regenerator. The working principles of these models were described, and their outputs were extracted and compared. Furthermore, the influence of the magnetocaloric effect, the magnetization area, and the thermodynamic processes and cycles on the efficiency of magnetic refrigeration was investigated and discussed to achieve a maximum cooling capacity. The classes of magnetocaloric magnetic materials were summarized from previous studies and their potential magnetic characteristics are emphasized. The essential characteristics of magnetic refrigeration systems are highlighted to determine the significant advantages, difficulties, drawbacks, and feasibility analyses of these systems. Moreover, a cost analysis was provided in order to judge the feasibility of these systems for commercial use. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
35. Vitamin D receptor gene polymorphism in patients with osteomalacic myopathy in Egypt.
- Author
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Shokri, Hossam M., Mohamed, Karim O., Fahmy, Nagia A., Mostafa, Ahmed O., and Ghareeb, Ahmed
- Subjects
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VITAMIN D receptors , *GENETIC polymorphisms , *MUSCLE diseases , *SINGLE nucleotide polymorphisms , *VITAMIN D , *NEMALINE myopathy - Abstract
Introduction: Vitamin D works by binding to vitamin D receptor (VDR). The muscle involvement in hypovitaminosis D was broadly named osteomalacic myopathy. Methods: A case control study involved 20 female patients diagnosed with osteomalacic myopathy compared with 15 age-matched healthy female controls. We assessed both for VDR genotype single-nucleotide polymorphisms (SNP) at 3 sites (ApaI, BsmI, and FokI). Results: ApaI and BsmI genotypes distribution in both groups showed non-significant difference unlike FokI genotypes in which we found significantly higher percentages of single allele mutation in patients vs. controls. Conclusion: The relation of VDR gene SNPs to muscle function was studied before but in healthy subjects. We tried to correlate if presence/absence of a certain mutation is responsible for the appearance of osteomalacic myopathy. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
36. Genomic alterations in the F8 gene correlating with severe hemophilia A in Egyptian patients.
- Author
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Mosaad, Rehab M., Amr, Khalda S., Rabie, Eman A., Mostafa, Naglaa O., Habib, Sonia A., and El‐Kamah, Ghada Y.
- Subjects
- *
HEMOPHILIA , *HEMOPHILIACS , *EXOMES , *NONSENSE mutation , *BLOOD coagulation disorders , *GENETIC mutation , *RECESSIVE genes - Abstract
Background: Hemophilia A (HA) is an inherited X‐linked recessive coagulation disorder caused by factor VIII (F8) deficiency. F8 rearrangements involving intron 22 (int22) and intron 1 (int1) account for almost half of severe HA phenotype also a hotspot exon 14 provides numerous mutational patterns. This study aims to identify F8 gene mutations among Egyptian HA patients. Methods: DNA samples from 60 HA patients were screened for int22 and int1 rearrangements using simplified inverse shifting PCR (IS‐PCR) followed by exon 14 sequencing. Also, four uncharacterized patients were studied by targeted exome sequencing. Results: In 33.3% of the studied patients, we identified three int22 rearrangements, three exon 14 mutations (two frameshift; one novel (NM_000132.3:c.2734_2735delAA, p.(N912Ffs*6)), a second reported mutation (NM_000132.3:c.3091_3094delAGAA, p.(K1031Lfs*9)), and one nonsense mutation (NM_000132.3:c.2440C>T, p.(R814*)). All identified mutations were detected in patients with severe HA phenotype. Targeted exome sequencing could not detect any known pathogenic variants. Conclusion: Intron 22 rearrangement and exon 14 mutations correlate with most severe hemophilia A Egyptian patients. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
37. Stability Analysis of Bread Wheat Genotypes for Heading Time and Grain Yield Using AMMI Model.
- Author
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A. A., Ahmed, Tawfelis, M. B., Sayed, M. A., Mahdy, R. E., and Mostafa, M. O.
- Subjects
- *
GRAIN , *GRAIN yields , *WHEAT , *GENOTYPE-environment interaction , *GENOTYPES , *SUM of squares , *BREAD - Abstract
Additive main effects and multiplicative interactions (AMMI) model analyses were performed to assess and quantify the magnitude of genotype by environment interaction (GEI) for number of days to heading (DH) and grain yield (GY/P) stability of sixteen promising bread wheat (Triticum aestivum L.) genotypes. Field experiments under recommended (N) and late (L) sowing date in newly reclaimed soil were conducted in the Agricultural Research Station at Arab-Elawamer, Assiut, Egypt for three consecutive seasons (2016/2017, 2017/2018 and 2018/2019). The combined ANOVA showed highly significant differences among genotypes and among environments for both traits, while GEI was highly significant for DH and not significant for GY/P. Results of AMMI analysis indicated that the first three AMMI (PC1, PC2 and PC3) were highly significant for DH and AMMI1 was only significant in case of GY/P. In addition, the environments showed high contributions to the total sum of squares (TSS) and explained 84.7 and 85.3% for days to heading and grain yield/plot, respectively. While, the genotypes captured 10.4 and 6.8% of the TSS for the same traits, respectively. Although that the GEI showed low contribution to the total SS, but its magnitude (7.9%) was larger than that for genotypes in case of GY/P. The AMMI stability value discriminated genotypes G3, G7, G9, G12 and G14. G3 were the most promising stable and adapted genotypes according to grain yield performance over environments. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
38. Subordination Properties for Multivalent Functions Associated with a Generalized Fractional Differintegral Operator.
- Author
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Zayed, Hanaa M., Kamal Aouf, Mohamed, and Mostafa, Adela O.
- Subjects
- *
DIFFERENTIAL algebra , *MULTIVALENT molecules , *HYPERGEOMETRIC functions , *FRACTIONAL calculus , *COMPUTATIONAL geometry - Abstract
Using of the principle of subordination, we investigate some subordination and convolution properties for classes of multivalent functions under certain assumptions on the parameters involved, which are defined by a generalized fractional differintegral operator under certain assumptions on the parameters involved. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
39. Electrospun nickel–tungsten oxide composite fibers as active electrocatalysts for hydrogen evolution reaction.
- Author
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Anis, Shaheen Fatima, Lalia, Boor Singh, Mostafa, Ahmad O., and Hashaikeh, Raed
- Abstract
Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. Novel crystalline nickel–tungsten oxide composite fibers were synthesized for the first time, to the best of our knowledge, through the electrospinning method using nickel acetate and ammonium metatungstate as precursor solutions. Fibers with five different Ni:W molar ratios, 2:1, 1:1, 1:2, 3:1 and 1:3, were prepared. After calcination, the produced fibers were composed of tungsten oxide (WO3), nickel oxide (NiO) and nickel tungstate (NiWO4). Fiber morphology and structure were studied using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Selected fibers were investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1 M KOH electrolytes. The electrospun composite fibers showed good electrocatalytic activity compared to pure NiO and WO3 fibers with an overpotential of 80 mV and 60 mV in acidic and basic media, respectively. Low Tafel slopes were also registered as 50.27 mV/dec and 41.29 mV/dec in H2SO4 and KOH, respectively. The presence of NiWO4 compound, formed during the composite fabrication, was responsible for improving the electrocatalytic performance of the fibrous catalyst. [ABSTRACT FROM AUTHOR] - Published
- 2017
- Full Text
- View/download PDF
40. Modeling and Optimization of a Compression Ignition Engine Fueled with Biodiesel Blends for Performance Improvement.
- Author
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Alahmer, Ali, Rezk, Hegazy, Aladayleh, Wail, Mostafa, Ahmad O., Abu-Zaid, Mahmoud, Alahmer, Hussein, Gomaa, Mohamed R., Alhussan, Amel A., and Ghoniem, Rania M.
- Subjects
- *
DIESEL fuels , *BIODIESEL fuels , *DIESEL motors , *RESPONSE surfaces (Statistics) , *PARTICLE swarm optimization , *ENERGY consumption , *FUZZY integrals , *THERMAL efficiency - Abstract
Biodiesel is considered to be a promising alternative option to diesel fuel. The main contribution of the current work is to improve compression ignition engine performance, fueled by several biodiesel blends. Three metrics were used to evaluate the output performance of the compression ignition engine, as follows: brake torque (BT), brake specific fuel consumption (BSFC), and brake thermal efficiency (BTE), by varying two input parameters (engine speed and fuel type). The engine speeds were in the 1200–2400 rpm range. Three biodiesel blends, containing 20 vol.% of vegetable oil and 80 vol.% of pure diesel fuel, were prepared and tested. In all the experiments, pure diesel fuel was employed as a reference for all biodiesel blends. The experimental results revealed the following findings: although all types of biodiesel blends have low calorific value and slightly high viscosity, as compared to pure diesel fuel, there was an improvement in both BT and brake power (BP) outputs. An increase in BSFC by 7.4%, 4.9%, and 2.5% was obtained for palm, sunflower, and corn biodiesel blends, respectively, as compared to that of pure diesel. The BTE of the palm oil biodiesel blend was the lowest among other biodiesel blends. The suggested work strategy includes two stages (modeling and parameter optimization). In the first stage, a robust fuzzy model is created, depending on the experimental results, to simulate the output performance of the compression ignition engine. The particle swarm optimization (PSO) algorithm is used in the second stage to determine the optimal operating parameters. To confirm the distinction of the proposed strategy, the obtained outcomes were compared to those attained by response surface methodology (RSM). The coefficient of determination (R2) and the root-mean-square-error (RMSE) were used as comparison metrics. The average R2 was increased by 27.7% and 29.3% for training and testing, respectively, based on the fuzzy model. Using the proposed strategy in this work (integration between fuzzy logic and PSO) may increase the overall performance of the compression ignition engine by 2.065% and 8.256%, as concluded from the experimental tests and RSM. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
Catalog
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