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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Ultrafine Grained and Nanostructured Materials
- نوع مقاله: Journal Article
- کلمات کلیدی: Silver,Magnetite,Core-shell,polyol,magnetic saturation
- چکیده:
- چکیده انگلیسی: This paper is a report on the synthesis of the Fe3O4@Ag core-shell with high saturation magnetization of magnetite nanoparticles as the core, by using polyol route and silver shell by chemical reduction. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy analyses confirmed that the particles so produced were monophase. The magnetic properties of the product were investigated by using a vibrating sample magnetometer. Magnetic saturation of magnetite was 91 emu/g that around about bulk magnetization. This high saturation magnetization can be attributed to the thin dead layer. By using polyethylene glycol as a surfactant to separate and restrict the growth of the particles, magnetostatic interactions are in good agreement with the remanence ratio analysis. Morphology and the average size of the particles were determined with field emission scanning electron microscope (FESEM). Spherical aggregates of Fe3O4 (size around 73 nm) are composed of a small primary particle size of about 16 nm. Silver deposition was done using butylamine as the reductant of AgNO3 in ethanol with different ratio. The silver layers were estimated using statistical histogram images of FESEM. Silver-coated iron oxide nanohybrids have been used in a broad range of applications, including chemical and biological sensing, due to the broad absorption in the optical region associated with localized surface plasmon resonance.
- انتشار مقاله: 08-04-1393
- نویسندگان: Mahdi Ghazanfari,Fatemeh Johar,Ahmad Yazdani
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Finance and Managerial Accounting
- نوع مقاله: Journal Article
- کلمات کلیدی: Credit Risk,KMV model,Probability of Default
- چکیده:
- چکیده انگلیسی: According to the adverse consequences that are brought by financial distress for companies, economy and financial –monetary institutions, the use of methods that can predict the occurrence of financial failure and prevent the loss of wealth is of great importance. The major models of credit risk assessment are based on retrospective information and using the methods which use the updated market data for prediction of the probability of default can lead to the increase of the reliability of results. The purpose of this study is to obtain optimal default barrier in KMV model by using an approach based on genetic algorithm and compare the performance of the proposed model to KMV model. Research data included all data of listed companies in the Tehran stock exchange that were bankrupted from 2009 to 2014 according to the article 141 of the commercial code. In total, 25 companies were considered as distressed companies and 50 non-bankrupted companies were also selected as the control group and then results of the two models were compared. The study results showed that the performance of the presented model in prediction of bankruptcy and separating distressed from non-distressed companies is better than KMV model. At the end, the optimal cut off rate was calculated to determine whether a specific company will be bankrupt or healthy according to its probability of default. The results showed that the calculated optimal value led to 80% correct prediction in 2015.
- انتشار مقاله: 10-05-1396
- نویسندگان: Meysam Hasanzadeh,Ahmad Reza Yazdanian
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Agricultural Management and Development
- نوع مقاله: Journal Article
- کلمات کلیدی: Transition Period,Personal And Social Indices,Managerial Strategies,Managerial And Economic Indices
- چکیده: The purpose of this research was to study the effects of four personal and social variables including the age, literacy, job experience and size of herd on different variables such as implementing of managerial strategies in transition period, relevant costs of these strategies, average production per head and gross income of milk sale per head. For this purpose all required information were collected through questionnaire distribution among the owners of commercial dairy farms of Shahroud district. This questionnaire was included three parts. Relevant information about personal and social indices was inserted in first part. Second part included of relevant information about performance and non-performance of considered managerial strategies in transition period and third part was about relevant information about production and economic records. Finally all information about 50 herds was obtained and compared as well. Data analysis was through applying Multiple Linear Regression (MLR) method. Also it was possible to specify any relation among independent and dependent variables through calculation of Pearson Correlation Coefficient. Finally it was revealed that social and personal factors have a significant effect on the implementation of management strategies and other independent factors.
- چکیده انگلیسی: The purpose of this research was to study the effects of four personal and social variables including the age, literacy, job experience and size of herd on different variables such as implementing of managerial strategies in transition period, relevant costs of these strategies, average production per head and gross income of milk sale per head. For this purpose all required information were collected through questionnaire distribution among the owners of commercial dairy farms of Shahroud district. This questionnaire was included three parts. Relevant information about personal and social indices was inserted in first part. Second part included of relevant information about performance and non-performance of considered managerial strategies in transition period and third part was about relevant information about production and economic records. Finally all information about 50 herds was obtained and compared as well. Data analysis was through applying Multiple Linear Regression (MLR) method. Also it was possible to specify any relation among independent and dependent variables through calculation of Pearson Correlation Coefficient. Finally it was revealed that social and personal factors have a significant effect on the implementation of management strategies and other independent factors.
- انتشار مقاله: 07-06-1394
- نویسندگان: Hamed Kashfi,Ahmad Reza Yazdani,Farhad Shirani Bidabadi,Mehrdad Latifi
- مشاهده