The Effect of Inflation on Performance

Ammar Yaser ALMANSOUR,Haitham Mohammad ALZOUBI,Bashar Yaser ALMANSOUR,Yaser Mansour ALMANSOUR 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6

This paper aims to investigate the effect of inflation trends on the performance of the banking sector in Jordan., with data from five Jordanina listed banks in Amman Stock Exchange over the period of 2009–2019. The performance indicators employed in this study are return on assets, return on investment, and margin of net interest. Our empirical strategy for this quantitative approach employ regression analysis to explore th influential of inflation on banks’ performance. The results of descriptive statistics show that the banks’ performance in Jordan has increased gradually during the period 2015 to 2018, meaning that banking sector had performed of this study effeciantly during the period of study regardless of the increasing of inflation rate in the country. Generally, our results show that there is a strong and negative relationship between inflation rate and banks’ performance. In addition, the results show that the Banks’ performances are significantly affected by inflation. Interested parties may pay attention to other macroeconomic variables to investigate the impact of the macroeconomic factors on Banks’ performance. Future research shall consider not only bankin sector but other sectors in the financial market.

Assessment of hemolytic activity of bee venom against some physicochemical factors

Yaser Yousefpoor,Amir Amani,Adeleh Divsalar,Seyyedeh Elaheh Mousavi,Yaser Eskandari Torbaghan,Omid Emami 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.4

Bee venom (BV) is a biotoxin with biologically active peptides which have cell lysis and hemolytic activity properties. These properties can be affected under different storage conditions or during the production process. In present study, we investigated effects of a number of physicochemical factors, including temperature, pH, UV radiation, ultrasound waves and storage time on hemolytic activity of BV. Maximum absorption and melting temperature of BV solution were obtained as 280 nm and ~70 °C, respectively. Cell hemolysis 50 (CH 50 ) -concentration of BV that can lyse 50% of red blood cells- was determined as 0.94 μg/ml at ambient temperature. CH 50 was shown not to be importantly varied at temperature up to 60 °C, pH value 2 to 13 and under UV/ ultrasound radiation. Storage at −20, 6 and 25 °C for 6 months made about 2.5, 35 and 1000 times increase in CH 50 . From the results, it may be concluded that BV is a relatively resistant hemolytic agent and can be used in a variety of laboratory research and product manufacturing methods.

The Dynamic Connectedness between Cryptocurrencies and Foreign Exchange Rates: Evidence by TVP-VAR Approach

Bashar Yaser Almansour,Md Mohan Uddin,Sabri Elkrghli,Ammar Yaser ALMANSOUR 대한산업공학회 2023 Industrial Engineeering & Management Systems Vol.22 No.3

We investigate the interconnectedness between major cryptocurrencies and foreign exchange rates. This study em-ploys time-series daily data for the cryptocurrencies and foreign exchange rates closing prices, the data is obtained from investing.com and yahoo finance to cover the period of 10 November 2017 to 18 January 2022. The study adopts the connectedness approach developed by Diebold Yilmaz (2014), using the TVP-VAR model to analyze twelve cryptocurrencies and eight foreign exchange rates. The results reveal a greater degree of connectedness across cryptocurrencies and foreign exchange rates over the whole sample, pre and during the corona pandemic, indicating that the Corona pandemic donates to the increase of volatility spillover across the currency and cryptocurrency mar-kets. The results further show that Ethereum, Bitcoin Cash, Litecoin, Bitcoin, TRON, Cardano and Ripple are the main transmitters of shocks to other cryptocurrencies. Moreover, the EUR/USD, AUD/USD and NZD/USD are the main transmitters of shocks to other foreign exchange rates. The study has significant implications for investors, and portfolio managers. Our results offer evidence to improve financial risk assessment, and portfolio hedging strategies of cryptocurrencies against the uncertainty raised by Covid-19 Pandemic, which our findings may support investors in properly rebalancing their portfolios as the level of uncertainty in the market changes

Performance of ARCH and GARCH Models in Forecasting Cryptocurrency Market Volatility

Bashar Yaser Almansour,Muneer M. Alshater,Ammar Yaser Almansour 대한산업공학회 2021 Industrial Engineeering & Management Systems Vol.20 No.2

The cryptocurrency market is highly volatile; this can be attributed to several factors such as being an emerging market that is purely digital and still evolving with many speculations taking place aligning with behavioural finance factors such as media and investors profile. This study aims to investigate the Autoregressive Conditional Heteroskedasticity (ARCH) and the Generalized Autoregressive Conditional Heteroskedasticity (GARCH) in forecasting selected 9 cryptocurrencies that represent over 80% of the total market capitalization. This study carries a time-series of daily data ranges from 2010 to 2020 base on each cryptocurrency starting date. The results show that the ARCH and GARCH have a significant effect in forecasting cryptocurrency market volatility which means that the past volatility of cryptocurrencies affects the current volatility of it. It also shows that bad and good news can significantly affect the conditional volatility of all cryptocurrencies returns. This study contributes to the investors’ understanding of the dynamics of the cryptocurrency market which enhances the ability to make informed decisions based on a scientific approach.

Synthesis, Microstructures and Mechanical Behaviour of Cr0.21Fe0.20Al0.41Cu0.18 and Cr0.14Fe0.13Al0.26Cu0.11Si0.25Zn0.11 Nanocrystallite Entropy Alloys Prepared by Mechanical Alloying and Hot-Pressing

Yaser A. Alshataif,S. Sivasankaran,Fahad A. Al‑Mufadi,Abdulaziz S. Alaboodi,H. R. Ammar 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.1

Four component Cr0.21Fe0.20Al0.41Cu0.18medium entropy alloy (Quaternary, 4C-MEA) and six componentCr0.14Fe0.13Al0.26Cu0.11Si0.25Zn0.11high entropy alloy (sexinary, 6C-HEA) were designed and developed in non-equiatomicratio to attain improved mechanical properties. These 4C-MEA, and 6C-HEA were synthesized via mechanical alloying(MA), and consolidated by hot pressing (HPing) at 723 K. For comparison, the same atomic ratio of four and six componentsof coarse grain alloys (4C-CGA and 6C-CGA) were also manufactured by conventional blending method. Nanocrystallitesize powders of 27 ± 5.20 nm and 38 ± 3.7 nm were achieved for 4C-MEA and 6C-HEA respectively after 20 h MA. Thephase evolutions, structural properties, and powder surface morphologies were characterized using X-ray diffraction andseveral electron microscopes. The 4C-MEA has possessed more quantity of body centred cubic (BCC) and less amountof face centred cubic (FCC) phases due to the more solid dissolution of 4 components. However, 6C-HEA exhibited morequantity of FCC and a small amount of BCC phases due to the incorporation of more FCC components compared to 4C-MEAand less solid dissolution due to more atomic radius difference among the mixing elements (atomic radius of Cr = 166 pm,Fe = 156 pm, Al = 118 pm, Cu = 145 pm, Si = 111 pm and Zn = 142 pm). The HPed samples produced ultra-fine crystallitesize of 177 nm and 499 nm for 4C-MEA and 6C-HEA respectively. Further, 4C-MEA and 6C-HEA exhibited the ultimatecompressive strength (UCS) of 365 MPa and 456 MPa respectively due to dissolution and lattice distortion of mixing elements. Also, 6C-HEA possessed Vickers hardness strength of around 1.97 GPa which was 2 times higher than 4C-MEA. The theoretical background of various strengthening mechanisms, various physicochemical, thermodynamic parameters, andfour core effects behind the improved properties in entropy alloys was discussed and reported. The dislocation strengtheningand solid solution strengthening were the major factors in exhibiting more UCS in 4C-MEA and 6C-HEA than 4C-CGAand 6C-CGA.

Application of Acrylate Latex Emulsion as the Binder for Coating Aluminum Substrate by Silica-Gel Powder

Yaser Gholami,Mohan Gholami 대한설비공학회 2019 International Journal Of Air-Conditioning and Refr Vol.27 No.4

The adsorbent coated exchangers are the main part of adsorption refrigeration systems. Although coated exchangers are commercially available, the coating technique and the binder used are seldom revealed and left as a challenge for researchers. Dip-coating is the most commonly used coating technique. However, the variety of binders used indicates that choosing the appropriate binder is still a matter of trial-and-error. A series of experiments were performed to introduce acrylic latex emulsion (ALE) and bitumen emulsion as the new binder for coating silica-gel powder on aluminum. The results indicate coats created by both emulsion binders are stable but the bitumen emulsion keeps its stability for about 10min after mixing with water and silica-gel powder. The effect of ALE binder and water concentrations on water vapor equilibrium and desorption kinetics was investigated. The outcomes indicated that the sample containing 0.8g water/g silica-gel, 0.08g ALE binder/g silica-gel shows the fastest desorption kinetic and the minimum capacity loss. The mechanical stability of this sample was evaluated by the shear test and the pull-off test. The measured values show that the prepared laminate withstands up to 27N/cm2 shear stress and 18N/cm2 tensile stress.

Dynamic analysis of non-symmetric FG cylindrical shell under shock loading by using MLPG method

Yaser Sadeghi Ferezghi,Mohamad R. Sohrabi,Seyed M. MosaviNezhad 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.67 No.6

The Dynamic equations in the polar coordinates are drawn out using the MLPG method for the non-symmetric FG cylindrical shell. To simulate the mechanical properties of FGM, the nonlinear volume fractions for radial direction are used. The shape function applied in this paper is a form of the radial basis functions, by using this function all the requirements for an effective and suitable shape function are established. Hence in this study, the multiquadrics (MQ) radial basis functions are exploited as the shape function governing the problem. The MLPG method is combined with the the Newmark time approximation scheme to solve dynamic equations in the time domain. The obtained results by the MLPG method to be verified are compared with the analytical solution and the FEM. The obtained results through the MLPG method show a good agreement in comparison to other results and the MLPG method has high accuracy for dynamic analysis of the non-symmetric FG cylindrical shell. To demonstrate the capability of the present method to dynamic analysis of the non-symmetric FG cylindrical shell, it is analyzed dynamically with different volume fraction exponents under harmonic and rectangular shock loading. The present method shows high accuracy, efficiency and capability to dynamic analysis of the non-symmetric FG cylindrical shell with nonlinear grading patterns.

Evaluation of alveolar crest bone loss via premolar bitewing radiographs: presentation of a new method

Yaser Safi,Mahdi Kadkhodazadeh,Pooria Safai,Mohammad Esmaeelinejad,Nafiseh Shamloo 대한치주과학회 2014 Journal of Periodontal & Implant Science Vol.44 No.5

Purpose: This study aimed to assess the interdental bone level in premolar bitewing radiographswhile retracting the cheeks. Methods: Seventy-two horizontal bone defects were created on dried mandibles and maxillae. The distance from the bone level to the cement-enamel junction of premolars wasdetected by a modified digital caliper (considered the gold standard). The reliability of allradiographs was assessed by intraclass correlation coefficient (ICC), and the validity wascompared to the gold standard using the analysis of variance test. P-values less than 0.05were considered statistically significant. Results: This study showed that the reliability of radiographs without a cheek simulatorand with 0.16 second exposure time was significantly higher than that of the two othergroups (ICC=0.96 compared to 0.93 and 0.88, respectively). The results from the radiographswithout a cheek simulator and with 0.16 second exposure time were more similar tothe gold standard measures than those of the two other groups, although the differencewas not statistically significant. Conclusions: Retracting the buccal soft tissue plays an important role in increasing the accuracyof radiographs in detecting the interdental alveolar bone level and produces moreaccurate results than increasing the exposure time, although it does not have a significantrole in reliability of results.

Factors Affecting Ex-vitro Rooting and Growth of Spathiphyllum plantlets in the Microponic Culture System

Yaser Dewir,Eun-Joo Hahn(한은주),Kee-Yoeup Paek(백기엽) 한국원예학회 2004 한국원예학회 학술발표요지 Vol.2004 No.5

Locally Kernel-based Nonlinear Regression for Face Recognition

Yaser Arianpour,Sedigheh Ghofrani,Hamidreza Amindavar 보안공학연구지원센터(IJSIP) 2012 International Journal of Signal Processing, Image Vol.5 No.4