Staff Portal
Mustafa Ismaeel Niaf Alukaly (Professor)

PhD in Mathematical Statistics

Mathematics - Education for Pure Sciences
eps.mustafa.ismaeel@uoanbar.edu.iq

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Biography

<p>&nbsp;</p> <table align="right" cellspacing="0" class="MsoTable15Grid6ColorfulAccent1" dir="rtl" style="border-collapse:collapse; border:none"> <tbody> <tr> <td style="border-bottom:2px solid #95b3d7; border-left:1px solid #95b3d7; border-right:1px solid #95b3d7; border-top:1px solid #95b3d7; height:45px; vertical-align:top; width:283px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><strong><span style="font-size:16.0pt">Mustafa Ismaeel Niaf</span></strong></span></span></span></p> </td> <td colspan="2" style="border-bottom:2px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:1px solid #95b3d7; height:45px; vertical-align:top; width:221px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><strong><span style="font-size:16.0pt">Name</span></strong></span></span></span></p> </td> </tr> <tr> <td style="background-color:#dbe5f1; border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:1px solid #95b3d7; border-top:none; height:42px; vertical-align:top; width:283px"> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span dir="LTR" style="font-size:16.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91">017.08.1974</span></span></span></strong></span></span></p> </td> <td colspan="2" style="background-color:#dbe5f1; border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:none; height:42px; vertical-align:top; width:221px"> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span dir="LTR" style="font-size:16.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91">Date of Birth</span></span></span></strong></span></span></p> </td> </tr> <tr> <td style="border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:1px solid #95b3d7; border-top:none; height:45px; vertical-align:top; width:283px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><strong><span style="font-size:16.0pt">Mathematical statistics</span></strong></span></span></span></p> <p style="text-align:center">&nbsp;</p> </td> <td colspan="2" style="border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:none; height:45px; vertical-align:top; width:221px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><strong><span style="font-size:16.0pt">Specialization</span></strong></span></span></span></p> </td> </tr> <tr> <td style="background-color:#dbe5f1; border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:1px solid #95b3d7; border-top:none; height:42px; vertical-align:top; width:283px"> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span dir="LTR" style="font-size:16.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91">faculty member</span></span></span></strong></span></span></p> </td> <td colspan="2" style="background-color:#dbe5f1; border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:none; height:42px; vertical-align:top; width:221px"> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span dir="LTR" style="font-size:16.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91">Position</span></span></span></strong></span></span></p> </td> </tr> <tr> <td style="border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:1px solid #95b3d7; border-top:none; height:45px; vertical-align:top; width:283px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><strong><span style="font-size:16.0pt">Assistant Professor</span></strong></span></span></span></p> <p style="text-align:center">&nbsp;</p> </td> <td colspan="2" style="border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:none; height:45px; vertical-align:top; width:221px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><strong><span style="font-size:16.0pt">Scientific Degree</span></strong></span></span></span></p> </td> </tr> <tr> <td style="background-color:#dbe5f1; border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:1px solid #95b3d7; border-top:none; height:42px; vertical-align:top; width:283px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><strong><span style="font-size:11.0pt">Department of M</span></strong><strong><span style="font-size:11.0pt">athematics</span></strong><strong><span style="font-size:11.0pt"> / College of Education for pure sciences</span></strong></span></span></span></p> </td> <td colspan="2" style="background-color:#dbe5f1; border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:none; height:42px; vertical-align:top; width:221px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><strong><span style="font-size:16.0pt">Work Address</span></strong></span></span></span></p> </td> </tr> <tr> <td style="border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:1px solid #95b3d7; border-top:none; height:45px; vertical-align:top; width:283px"> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span dir="LTR" style="font-size:16.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91">07808505720</span></span></span></strong></span></span></p> </td> <td colspan="2" style="border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:none; height:45px; vertical-align:top; width:221px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><span style="font-size:16.0pt">Mobile</span></span></span></span></p> </td> </tr> <tr> <td style="background-color:#dbe5f1; border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:1px solid #95b3d7; border-top:none; height:45px; vertical-align:top; width:283px"> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span style="font-size:16.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91"><a href="mailto:eps.mustafa.ismaeel@uoanbar.edu.iq" style="color:blue; text-decoration:underline">e<span dir="LTR" style="font-size:11.0pt"><span style="font-family:&quot;Calibri&quot;,sans-serif">ps.mustafa.ismaeel</span></span>@<span dir="LTR" style="font-size:11.0pt"><span style="font-family:&quot;Calibri&quot;,sans-serif">uoanbar.edu.iq</span></span></a></span></span></span></strong><strong> </strong></span></span></p> </td> <td colspan="2" style="background-color:#dbe5f1; border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:none; height:45px; vertical-align:top; width:221px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><span style="font-size:16.0pt">E. mail </span></span></span></span></p> </td> </tr> <tr> <td style="border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:1px solid #95b3d7; border-top:none; height:51px; vertical-align:top; width:283px"> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span dir="LTR" style="font-size:12.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91">University of Anbar</span></span></span></strong></span></span></p> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span style="font-size:12.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91">College of Education - 1996</span></span></span></strong></span></span></p> </td> <td style="border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:none; height:51px; vertical-align:top; width:109px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><span style="font-size:16.0pt">B.Sc.</span></span></span></span></p> </td> <td rowspan="3" style="border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:none; height:51px; vertical-align:top; width:112px"> <p style="text-align:center">&nbsp;</p> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><strong><span style="font-size:16.0pt">Scientific</span></strong><strong><span style="font-size:16.0pt"> Certification</span></strong></span></span></span></p> </td> </tr> <tr> <td style="background-color:#dbe5f1; border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:1px solid #95b3d7; border-top:none; height:51px; vertical-align:top; width:283px"> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span style="font-size:12.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91">University of Al-Albyet</span></span></span></strong></span></span></p> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span style="font-size:12.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91">College of Science and Arts- 2003</span></span></span></strong></span></span></p> </td> <td style="background-color:#dbe5f1; border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:none; height:51px; vertical-align:top; width:109px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><span style="font-size:16.0pt">M.Sc.</span></span></span></span></p> </td> </tr> <tr> <td style="border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:1px solid #95b3d7; border-top:none; height:51px; vertical-align:top; width:283px"> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span style="font-size:12.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91">Pune University</span></span></span></strong></span></span></p> <p style="text-align:center"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong><span style="font-size:12.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:#365f91">Faculty of Science - 2009</span></span></span></strong></span></span></p> </td> <td style="border-bottom:1px solid #95b3d7; border-left:1px solid #95b3d7; border-right:none; border-top:none; height:51px; vertical-align:top; width:109px"> <p style="text-align:center"><span style="font-size:12pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black"><span style="font-size:16.0pt">Ph.D.</span></span></span></span></p> </td> </tr> </tbody> </table> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p>

Publication

<p>&nbsp;<span style="font-size:14pt">&nbsp;</span><span style="font-size:11pt">1-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></span><span style="font-size:14pt">New types of shrinkage estimator, Far East J mathl Sci, 2007</span></p> <p><span style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:0.5in"><span style="font-size:11pt">2-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></span><span style="font-size:14pt">&nbsp; A new biased estimator for the restricted linear regression model, Journal of Statistical Theory and Applications,2008.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:0.5in"><span style="font-size:11pt">3-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></span><span style="font-size:14pt">A new estimator in multiple linear regression, Model Assisted Statistics and Applications,2008.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:0.5in"><span style="font-size:11pt">4-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></span><span style="font-size:14pt">On the Liu and Almost unbiased Liu Estimators in the presence of multicollinearity with heteroscedastic or correlated, Surveys in Mathematics and its Applications,2009.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:0.5in"><span style="font-size:11pt">5-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></span><span style="font-size:14pt">On the distribution of shrinkage parameters of Liu-type estimators,</span><span dir="RTL" style="font-family:&quot;Traditional Arabic&quot;,serif; font-size:14pt">&nbsp;<a href="http://projecteuclid.org/handle/euclid.bjps"><span dir="LTR" style="color:black; font-family:&quot;Times New Roman&quot;,serif">Brazilian journal of Probability and&nbsp; Stat</span></a></span><span style="font-size:14pt">istics,2009.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:0.5in"><span style="font-size:11pt">6-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></span><span style="font-size:14pt">Two Strategies for Removing Multicollinearity, International Journal of Statistics &amp; Economics (formerly known as the &ldquo;Bulletin of Statistics &amp; Economics&quot;),2009.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:0.5in"><span style="font-size:11pt">7-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></span><span style="font-family:&quot;Traditional Arabic&quot;,serif; font-size:14pt"><span style="font-family:&quot;Times New Roman&quot;,serif">Confidence Interval for Shrinkage Parameters in Ridge Regression</span></span><span style="font-size:14pt">, Communications in Statistics - Theory and Methods,2009.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:0.5in"><span style="font-size:11pt">8-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></span><span style="font-size:14pt">The Analysis of Residuals for Some Linear Restricted &nbsp;Estimators in the Restricted Linear Model, Pioneer Journal of Theoretical and Applied Statistics,2011.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:0.5in"><span style="font-size:11pt">9-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></span><span style="font-size:14pt">A new stochastic restricted biased estimator under heteroscedastic or correlated error, ESAIM: Probability and Statistics., France,2011.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:26pt"><span style="font-size:11pt">10-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;</span></span><span style="font-size:14pt">A new almost unbiased estimator in stochastic linear restriction model, Iraqi Journal of Statistical Sciences,2011</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:26pt"><span style="font-size:11pt">11-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;</span></span><span style="font-size:14pt">LIU-TYPE ESTIMATOR AND SELECTION OF VARIABLES, Journal of Anbar university for pure science,2012.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:26pt"><span style="font-size:11pt">12-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;</span></span><span style="font-size:14pt">MODIFIED LIU-TYPE ESTIMATOR BASED ON (r-k) CLASS ESTIMATOR, Communications in Statistics - Theory and Methods. USA,2013.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:26pt"><span style="font-size:11pt">13-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;</span></span><span style="font-size:14pt">A GENERALIZED STOCHASTIC RESTRICTED RIDGE REGRESSION ESTIMATORS, Communications in Statistics - Theory and Methods. USA,2014.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:26pt"><span style="font-size:11pt">14-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;</span></span><span style="font-size:14pt">ON THE WEIGHTED STOCHASTIC RESTRICTED RIDGE REGRESSION AND SHRINKAGE ESTIMATORS, Far East Journal of Mathematical Sciences,2018</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:26pt"><span style="font-size:11pt">15-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;</span></span><span style="font-size:14pt">A new version of unbiased ridge regression estimator under the stochastic restricted linear regression model, Communication in statistics- Simulation and Computation,2019</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp;</span></p> <p style="margin-left:26pt"><span style="font-size:11pt">16-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;</span></span><span style="font-size:14pt">Proposed A New Stochastic Restricted (r-k) Ridge regression estimator With Some New Ridge Parameters in Linear Regression model And Study its performance Via Monte Carlo Simulation Method, AUS Journal,2019.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</span><span style="font-size:11pt">17-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;&nbsp;</span></span><span style="font-size:14pt">New Version of a Liu-type Estimator in Weighted and non-weighted Mixed regression Model, Baghdad Science&nbsp; </span></p> <p><span style="font-size:14pt">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Journal,2020.</span></p> <p><span dir="LTR" style="font-size:14pt">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</span><span style="font-family:Arial,sans-serif; font-size:11pt">18-<span style="font-family:&quot;Times New Roman&quot;; font-size:7pt">&nbsp;</span></span><span style="font-size:14pt">A New Kind of&nbsp; Stochastic Restricted Biased Estimator for Logistic&nbsp;Regression Model, Journal of Applied</span></p> <p><span style="font-size:14pt">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Statistics,2020.</span></p> <p style="margin-left:0.5in"><span style="font-size:14pt">19-<span style="color:#000000">&nbsp;</span></span><span style="color:#000000"><span style="font-family:Times New Roman,Times,serif"><span style="font-size:18px">On modified unbiased two-parameter estimator</span></span>,</span>&nbsp;<span style="font-family:Times New Roman,Times,serif"><span style="font-size:14pt">Communication in statistics- Simulation and Computation,2021</span></span></p> <p style="margin-left:0.5in"><span style="font-size:14pt">20-</span><span style="color:#000000">A Simulation Study of Some Restricted Estimators in Restricted Linear Regression Model,&nbsp;Tikrit University, College of Science, Tikrit Journal of Pure Sciences,2021</span></p> <p style="margin-left:0.5in"><span style="color:#000000">21-The Performance of Some Restricted Estimators In Restricted Linear Regression Model,Al-Qadisiyah Journal of Pure Science,2021</span></p> <p style="margin-left:0.5in"><span style="color:#000000">22-Modified almost unbiased two-parameter estimator for the Poisson regression model with an application to accident data,SORT,2021</span></p> <p style="margin-left:0.5in"><span style="color:#000000">23-New Restricted Estimator Based On Modified Unbiased Ridge Regression estimator,IOP Conference Proceedings,2021</span></p> <p style="margin-left:0.5in"><span style="color:#000000">24-New Procedure for Selecting Raise Vector in Raising Regression,IOP Conference Proceedings,2021</span></p> <p style="margin-left:0.5in">&nbsp;</p>

Lectures

Title of the lecture

Subject

No.

Bernoulli Distribution

Probability 1

1

binomial distribution

Probability 1

2

Poisson distribution

Probability 1

3

Some examples of discrete  distributions

Probability 1

4

Discrete  uniform distribution

Probability 1

5

Geometric distribution

Probability 1

6

The Gama distribution and some related distributions

Probability 1

7

Discuss solutions to questions about some discrete distributions

Probability 1

8

Normal distribution - part one

Probability 1

9

Normal Distribution - Part Two

Probability 1

10

Student distribution -t

Probability 1

11

Discuss solutions to normal distribution questions

Probability 1

12

Functions Distributions Random Variables - Part One

Probability 1

13

Functions Distributions Random Variables - Part Two

Probability 1

14

Some applications about distributions of random variables

Probability 1

15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


# المادة اسم المحاضرة المرحلة التحميل مشاهدة