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匹配条件: “Atta Heidari” ,找到相关结果约657条。
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Prevalence of unilateral hearing loss among kindergarteners aged 3-6 years in Hamadan city, 2012
Atta Heidari,Ayub Valadbeigi
Pajouhan Scientific Journal , 2012,
Abstract: Introduction: Unilateral hearing loss has devastating effects on sound localization, speech understanding in adverse listening conditions, academic achievement, behavior and learning of Hearing impaired children. Early detection and intervention with regard to the issues of unilateral hearing loss is important in young children. The main goal of this study was to determine the prevalence of unilateral hearing loss among kindergarteners aged 3-6 years in Hamadan city, 2012.Material and Methods: In this cross-sectional descriptive study, 345 subjects (185 female, 160 male) were selected through random sampling. Play Audiometry test was used to determine the hearing threshold.Results: The results indicated that from the sum of 690 ears, 30(4.3%), had unilateral hearing loss; 26 (3.8%) with conductive hearing loss, 3 (0.4%) with sensorineural hearing loss and one (0.1%) with mixed hearing loss. No significant differences were observed between paired ears, genders and different ages.Conclusion: In this study, the prevalence of unilateral hearing loss was high (4.3%), 3.8% is conductive hearing loss accruing least one during childs language learning. Given the high prevalence of unilateral hearing loss in children 3-6 years of age, and the importance of this period in speech, language and learning development, early diagnosis and intervention is essential.
Exploring the Relationship between Statins and Alzheimer’s Disease: Can Statins Really Prevent Alzheimer’s Disease?  [PDF]
Massud Atta
Advances in Alzheimer's Disease (AAD) , 2015, DOI: 10.4236/aad.2015.41002
Abstract: Alzheimer’s Disease is a common form of dementia that has neurological and behavioral repercussions. It is definitively diagnosed usually via an autopsy when the following three common markers are found: flattened cortical gray matter, Tau proteins and Beta-amyloid proteins. Patients suffering from Down Syndrome or Parkinson’s Disease are often associated with Alzheimer’s because they have 2 of the 3 precursors. There has been extensive research on Alzheimer’s and many studies claim that statins, a cholesterol-reducing drug, can help prevent Alzheimer’s Disease resulting in low levels of beta-amyloid. However, there are several reasons to believe that this is not true and in some cases statins may even induce AD. This paper will examine the pathology of Alzheimer’s, the effect of statins and whether it truly plays a role in preventing AD.
The Valuation of Infrastructure Index Bonds  [PDF]
Joseph Atta-Mensah
Journal of Mathematical Finance (JMF) , 2015, DOI: 10.4236/jmf.2015.54028
Abstract:

The paper examines a potential role of financing Africa’s infrastructure projects, particularly in Africa, with bonds indexed to the project. Using option-pricing techniques, the author shows that an infrastructure indexed bond is equivalent to a regular bond and a short position on a European put option. The results of the paper suggest that the value of the infrastructure indexed bond increases monotonically as the value of the project it is financing rises. In addition, the market value of the infrastructure-indexed bonds falls as the value of the project becomes more volatile. The rise in the dividend rate on the project is observed to have an adverse effect on the value of infrastructure-indexed bonds.

The Role of Collateral in Credit Markets  [PDF]
Joseph Atta-Mensah
Journal of Mathematical Finance (JMF) , 2015, DOI: 10.4236/jmf.2015.54027
Abstract:

The author examines the role of collateral in an environment where lenders and borrowers possess identical information and similar beliefs about its future value. Using option-pricing techniques, he shows that a secured loan contract is equivalent to a regular bond and an embedded option to the borrower to default. The author finds that the lender will not advance to the borrower, a loan that exceeds the market value of the collateral, and that the supply of loans increases with a rise in the market value of the collateral. Increases in the volatility of the value of the collateral, interest rate, and dividend rate of the collateral independently depress the loan supply. The author also derives the cost of a third-party guarantee of a loan and an implied risk premium.

The Computation of Scalar Curvature in the Four-State Mixed Spin Model and the Investigation of Its Behavior: A Computational Study  [PDF]
Alireza Heidari, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.31005
Abstract: The following article has been retracted due to the investigation of complaints received against it. Mr. Mohammadali Ghorbani (corresponding author and also the last author) cheated the authors’ name: Alireza Heidari, Foad Khademi,Jahromi and Roozbeh Amiri. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.4 334-339, 2012, has been removed from this site.
An Analytical and Numerical Approach to the Self-Consistent Method for Computing the Proportion of F2n/F2p Using the 3He and 3H Nucleuses’ Structure Function and EMC Ratio  [PDF]
Alireza Heidari, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.31017
Abstract: The following article has been retracted due to the investigation of complaints received against it. Mr. Mohammadali Ghorbani (corresponding author and also the last author) cheated the author’s name: Alireza Heidari. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.1 124-128, 2012, has been removed from this site.
New Approach to Simulating the Absorption of Gamma Radiations Using the Monte-Carlo Method: A Computational Study  [PDF]
Alireza Heidari, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.33035
Abstract: The following article has been retracted due to the investigation of complaints received against it. Mr. Mohammadali Ghorbani (corresponding author and also the last author) cheated the author’s name: Alireza Heidari. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.3, 260-265, 2012, has been removed from this site.
A New Approach to the Ground State of Superfluid Fermi Gas near the Feshbach Resonance of d-Wave  [PDF]
Alireza Heidari, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.32020
Abstract: The following article has been retracted due to the investigation of complaints received against it. Mr. Mohammadali Ghorbani (corresponding author and also the last author) cheated the author’s name: Alireza Heidari. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.2, 151-154, 2012, has been removed from this site.
The Study and Investigation of Electron Trajectories in Free Electron Laser with Realizable Helical Wiggler and Ion Channel Guiding: A Computational Study  [PDF]
Alireza Heidari, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.33039
Abstract: The following article has been retracted due to the investigation of complaints received against it. Mr. Mohammadali Ghorbani (corresponding author and also the last author) cheated the author’s name: Alireza Heidari. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.3, 278-281, 2012, has been removed from this site.
The Structure Functions in the Weak and Semileptonic Decay of Meson B to the Mesons D and D*: A Computational Study  [PDF]
Alireza Heidari, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.32028
Abstract: The following article has been retracted due to the investigation of complaints received against it. Mr. Mohammadali Ghorbani (corresponding author and also the last author) cheated the author’s name: Alireza Heidari. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.2, 208-213, 2012, has been removed from this site.
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