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نویسندگان: 

Yazdani Cherati Allahbakhsh | Azimi Zohre

اطلاعات دوره: 
  • سال: 

    2023
  • دوره: 

    14
  • شماره: 

    8
  • صفحات: 

    161-167
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    32
  • دانلود: 

    0
چکیده: 

The ultimate goal of this performance study is to provide a  proposed scheme for solving the time-fractional stochastic advection-diffusion equation (TFSADE) of order $\alpha (0\le \alpha <1)$. In this proposed scheme, we utilize an approach based on cubic TRIGONOMETRIC B-SPLINE collocation methods (CTBSCM).  In this study, we replace the existing fractional derivative with the fractional Caputo derivative for time discretization and then replace the first and second derivatives of the equation using cubic TRIGONOMETRIC B-SPLINE functions for spatial discretization. Applying this proposed scheme to TFSADE causes the equation to reduce to the linear system. In the end, the examples show that the order of convergence of the proposed method is $O(\tau ^{2-\alpha}+h^2)$ where $h$ and $\tau$  are the spatial and time step lengths, respectively.

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اطلاعات دوره: 
  • سال: 

    1386
  • دوره: 

    3
  • شماره: 

    11
  • صفحات: 

    23-32
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    1019
  • دانلود: 

    912
چکیده: 

گرافیک کامپیوتری طی سالهای گذشته، پیشرفت بسیاری داشته است. در این مقاله به بررسی نوع خاصی از گرافیک کامپیوتری که گرافیک برداری نام دارد می پردازیم و به پیش زمینه های ریاضی آن با استفاده از منحنیها و سطوح NURBS اشاره می کنیم که اغلب ناشناخته اند و کمتر به آن پرداخته شده است. سپس کاربرد فرمولهای ریاضی ارایه شده را در نرم افزارهای گرافیکی برداری بررسی می کنیم.

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نویسندگان: 

AMIRFAKHRIAN M. | NOURIANI H.

اطلاعات دوره: 
  • سال: 

    2011
  • دوره: 

    1
  • شماره: 

    3
  • صفحات: 

    175-181
تعامل: 
  • استنادات: 

    7
  • بازدید: 

    497
  • دانلود: 

    0
چکیده: 

Please click on PDF to view the abstract.

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نویسندگان: 

LIU H. | LIU LI | ZHANG D.

اطلاعات دوره: 
  • سال: 

    2014
  • دوره: 

    11
  • شماره: 

    1
  • صفحات: 

    45-55
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    169
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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بازدید 169

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نویسندگان: 

Yagmurlu Nuri Murat | Karakas Ali Sercan

اطلاعات دوره: 
  • سال: 

    2022
  • دوره: 

    10
  • شماره: 

    4
  • صفحات: 

    1046-1058
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    31
  • دانلود: 

    0
چکیده: 

In the present study, the Modified Equal Width (MEW) wave equation is going to be solved numerically by presenting a new technique based on the collocation finite element method in which TRIGONOMETRIC cubic B-SPLINEs are used as approximate functions. In order to support the present study, three test problems,namely, the motion of a single solitary wave, the interaction of two solitary waves, and the birth of solitons are studied. The newly obtained results are compared with some of the other published numerical solutions available in the literature. The accuracy of the proposed method is discussed by computing the numerical conserved laws as well as the error norms L2 and L∞, .

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عنوان: 
نویسندگان: 

WANG G. | CHEN Q. | ZHOU M.

اطلاعات دوره: 
  • سال: 

    2004
  • دوره: 

    21
  • شماره: 

    2
  • صفحات: 

    193-205
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    234
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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بازدید 234

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مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
نویسندگان: 

Edosa Merga F. | File Duressa G.

اطلاعات دوره: 
  • سال: 

    2024
  • دوره: 

    14
  • شماره: 

    3
  • صفحات: 

    638-661
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    4
  • دانلود: 

    0
چکیده: 

In this paper, a singularly perturbed one-dimensional initial boundary value problem of a quasilinear Sobolev-type equation is presented. The nonlinear term of the problem is linearized by Newton’s linearization method. Time derivatives are discretized by implicit Euler’s method on nonuniform step size. A uniform TRIGONOMETRIC B-SPLINE collocation method is used to treat the spatial variable. The convergence analysis of the scheme is proved, and the accuracy of the method is of order two in space and order one in time direction, respectively. To test the efficiency of the method, a model example is demonstrated. Results of the scheme are presented in tabular, and the figure indicates the scheme is uniformly convergent and has an initial layer at t = 0.

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نویسنده: 

ESMAEILI MARYAM | TAVAKOLI ALI

اطلاعات دوره: 
  • سال: 

    2013
  • دوره: 

    44
تعامل: 
  • بازدید: 

    127
  • دانلود: 

    0
چکیده: 

AS FAR AS WE KNOW, UP TO NOW MULTIPLE KNOT B-SPLINE WAVELETS HAVE BEEN CONSTRUCTED BASED ON THE MULTIPLE KNOT B-SPLINE BASIS FUNCTIONS WHOSE KNOT POINTS ARE MULTIPLE ONLY IN THE END-POINTS.

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نویسندگان: 

LU Y. | WANG G. | YANG X.

اطلاعات دوره: 
  • سال: 

    2002
  • دوره: 

    19
  • شماره: 

    6
  • صفحات: 

    379-393
تعامل: 
  • استنادات: 

    2
  • بازدید: 

    252
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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بازدید 252

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اطلاعات دوره: 
  • سال: 

    1402
  • دوره: 

    53
  • شماره: 

    4
  • صفحات: 

    245-254
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    142
  • دانلود: 

    20
چکیده: 

This study aimed to estimate the genetic parameters of body weight traits in Markhoz goats, using B-SPLINE random regression models. The data used in this study included 19549 records collected during 29 years (1992-2021) in Markhoz goat Breeding Research Station, located in Sanandaj, Iran. The model used to analyze data included fixed effects (year of birth, sex, type of birth and age of dam) and random effects including direct additive genetic, maternal additive genetic, permanent environmental and maternal permanent environmental assuming homogeneous and heterogeneous residual variance during the time. Akaike (BIC) and Bayesian (BIC) information criteria were used to compare the models and bspq.4.4.4.4 was selected as the best model. The direct heritability values for birth, 3-month, 6-month, 9-month and 12-month weights were estimated to be 0.14, 0.16, 0.08, 0.28 and 0.26, respectively. Genetic correlation between body weights at birth and 3-month, birth and 6-month, birth and 9-month, birth and 12-month, 3-month and 6-month, 3-month and 9-month, 3-month and 12-month, 6-months and 9-month and 9-month and 12-month were 0.22, 0.38, 0.21, 0.56, -0.26, 0.30, 0.62, 0.86 and 0.77, respectively. The highest phenotypic correlation was between the weight of 9-month and 12-month (0.82) and the lowest correlation was between birth weight and 3-month and 6-month (0.12). The results showed that the 9-month weight is a good criterion for selection in Markhoz goats.

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