Functional and Environmental Advantage of Cleaning Ti5B1 Master Alloy

Aleksandar Mitrašinović,Miloš Tomić 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.3

One of the greatest environmental goals for the aluminum alloys industry is generating higher quality products by introducing cleaner input materials while maintaining low production costs. A typical dilemma for the master alloy producers is the cleanness level of the master alloy since insoluble inclusions could serve as inoculants during the solidification process. In this work, commercial Ti5B1 master alloy is used for grain refinement of Al7Si4Cu aluminum alloy and compared with the cleaned master alloy that contained a lower amount of residual refractory oxides and salts. Metallography analysis was used for grain size measurement while Computer Aided Cooling Curve Analysis was used for assessment of the undercooling and heat release values. In all instances, specimens treated with the cleaned master alloy showed smaller grains in the final structure and lower undercooling values. The difference in released heat between liquidus and recalescence temperatures was about 25% in specimens where added 0.66 wt% of cleaned master alloys compared to specimens where the commercial master alloys were added. Using cleaner Ti5B1 master alloy with a higher number of TiAl 3 and TiB 2 particles improves its grain refi nementefficiency and transmits fewer impurities in produced parts. Producing cleaner master alloy would be beneficial from economic and environmental aspects by increasing its value and service time of produced parts besides simplifying the recycling process at the end of parts life-cycle.

A Digital Twin-based Approach for Charge Estimation in Electric Vehicle

Mitra Pooyandeh,Insoo Sohn 한국통신학회 2023 한국통신학회 학술대회논문집 Vol.2023 No.6

Response surface methodology in optimization of a divided wall column

Mitra Sadat Lavasani,Rahbar Rahimi,Mortaza Zivdar 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.7

A dividing wall column (DWC) is a thermally coupled distillation system with a high energy efficiency that requires lower space and investment compared to the conventional column system. The design of a DWC involves a number of structural and process parameters that need to be optimized simultaneously to improve energetic and economic potential and reduce space requirement. We used response surface methodology (RSM) to optimize DWC nonlinearly and to figure out the effect of parameters and their interactions on energy consumption, product quality, and dimensions of a DWC. Results demonstrate that process variables have significant effects on the energy efficiency of a DWC as compared to the effect of structural variables. The optimum DWC parameters can be found by RSM with minimal simulation runs and the prediction results of RSM agree well with the rigorous simulation results.

Comparison of temporomandibular disorders between menopausal and non-menopausal women

Mitra Farzin,Masumeh Taghva,Moslem Babooie 대한구강악안면외과학회 2018 대한구강악안면외과학회지 Vol.44 No.5

Objectives: Hormonal changes during menopause alter a woman’s susceptibility to some disorders. Information regarding the prevalence of temporomandibular disorder (TMD) in menopausal women is limited in the literature. In this study, the prevalence and severity of TMDs were compared between menopausal and non-menopausal women. Materials and Methods: The study included 140 women (69 premenopausal and 71 postmenopausal) 45 to 55 years of age that were examined in Shiraz Dental School, Shiraz in Iran. The Helkimo clinical dysfunction index (Di) was used to evaluate temporomandibular joint (TMJ) dysfunction. The data were analyzed using chi-square and Fisher’s exact tests. Results: Occurrence of TMD was significantly higher in menopausal than non-menopausal women (P<0.001). All the TMD criteria based on Helkimo Di except range of mandibular movement were significantly more common in menopausal women. The range of mandibular movement was not significantly different between menopausal and non-menopausal women (P=0.178). Conclusion: The results from this study show that TMD can be considered more common and severe in menopausal than non-menopausal women. This finding indicates that, similar to other conditions in menopausal women such as arthritis and osteoporosis, TMD should be taken into consideration by dental and medical professionals.

Effect of Cu Layer Thickness on Giant Magnetoresistance Properties of NiCoFe/Cu/NiCoFe Sandwich

Mitra Djamal,Ramli,Yulkifli,Khairurrijal 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8

The NiCoFe/Cu/NiCoFe sandwiches were grown onto Si (111) substrate by dc-opposed target magnetron sputtering (dc-OTMS) technique. The growth parameters are: temperature 100 <SUP>0</SUP>C, applied voltage 600 volt, flow rate of Ar gas 100 sccm, and growth pressure 5.2 x10<SUP>-1</SUP> Torr. The effects of Cu layer thickness on giant magnetoresistance (GMR) property of NiCoFe/Cu/NiCoFe sandwich were studied. We have found that the giant magnetoresistance (GMR) ratio is varied depend on the non-magnetic (Cu) layer thickness. The variation of Cu layer thickness of NiCoFe/Cu/NiCoFe sandwich presents an oscillatory behavior of GMR ratio. This oscillation reflects the exchange coupling oscillations between ferromagnetic and antiferromagnetic states, which are caused by an oscillation in the sign of the interlayer exchange coupling between ferromagnetic layers.

Beryllium oxide (BeO) nanotube provides excellent surface towards adenine adsorption: A dispersion-corrected DFT study in gas and water phases

Mitra Sherafati,Ali Shokuhi Rad,Mehdi Ardjmand,Amir Heydarinasab,Majid Peyravi,Mahmoud Mirzaei 한국물리학회 2018 Current Applied Physics Vol.18 No.9

Zigzag (5, 0) BeO nanotube (BeONT) has been examined in detail towards adsorption properties of adenine nucleobase on its surface via D2-DFT calculation method in the gas and water phases. A detailed surface study reveals that there are four orientations for nucleobase adsorption that none of the vibrational spectrums demonstrated imaginary frequency, recognizing that all of the relaxed structures are at the minimum of energy. The minimum and maximum adsorption energies are both in chemisorption regime with calculated values of −140 (−118 BSSE corrected) and −191 (−168 BSSE corrected) in the gas phase, and −181 and −310 kJ/mol in the water phase, using meta-hybrid functional (□B97XD) and 6-31G** basis set. For all positions, BeONT showed p-type semiconducting property because of receiving electronic charge from adenine molecule. Our findings suggest that BeONT could be used as a possible strong carrier for adenine molecule in practical applications.

Diversity of medicinal plant traditionally used by Baiga tribes in District Umaria, Madhya Pradesh, India

Mitra Arman 경희대학교 융합한의과학연구소 2022 Oriental Pharmacy and Experimental Medicine Vol.22 No.4

The conventional source of medicinal plants is an important way for daily curative uses in rural area throughout Madhya Pradesh. Folk medicinal specialists or traditional healer (Medicine men), assume an indispensable part in a medicinal services arrangement of both provincial and urban populace of the nation. It is vital to conduct broad meetings of individual medicine men of an area to get the overall status of medicinal plants. A survey was accomplished in the rustic territory of district Umaria, Madhya Pradesh. This investigation has uncovered a sum of 40 plants out of which 33 plants were identified, which belongs to 22 families. Whole plants and/or plant parts, like leaves, stems, barks, roots, flowers, fruits, seeds and wood were usually used by Biga tribe (Medicine men) for the treatment of different illnesses. Leaves (5%) were the most oftentimes used plant parts, trailed by roots (11%), fruits (3%) barks (5%), whole plants (3%), seeds (2%), latex (2%) and flowers (2%). Add up to 33 diverse individual illnesses professed to be restored by plant parts including Breast abscess, Cure carbuncle, Cure rheumatic, Cure scabies, Diabetes, Diarrhoea, Eczema, Haematuria, Headache, Jaundice, Leucorrhoea, Leukoderma, Menstrual disorder, Piles, Rat bites, Scorpion bite, Skin burns, Skin disease, Spermatorrhea, Stomachache, Toothache, Typhoid and fever, used to abortifacient, increase milk after delivery, Whooping cough and Wounds of animals. Several uses of the plants could be validated by available literature review. It is expected that other plants used for treatment of various diseases by the Biga tribes (medicine men) can be subjected for further bio-activity and phytochemical studies, which prompts disclosure of new medications.

Study of federated learning in industrial IoT

Mitra Pooyandeh,Insoo Sohn 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11

The Industrial Internet of Things (IIoT) is actually a subset of IoT. Therefore, the growing development of IoT technology in recent years and its application in the industry have improved the performance of various industries. Certainly, the extensive usage of IoT in industrial is led to producing a huge amount of data that require a server for processing. while sending this amount of data causes several issues such as data centralization and privacy-preserving. Federated learning (FL) is an exhaustive solution to overcome these problems. Given that federated learning technology implemented in IIoT keep the data on the device as result, it helps the data security and optimizes the communication cost. In this article, we present a study of FL in IIoT.

Study of compounds, cytotoxicity and biological activities of essential oil of Satureja rechingeri Jamzad

Mitra Arman,Kiana Pirian,Mostafa Alinaghizadeh,Fatemeh Khosheghbal,Reza Nahavandi,Saeid Tamadoni Jahromi 경희대학교 융합한의과학연구소 2022 Oriental Pharmacy and Experimental Medicine Vol.22 No.4

Nowadays, the essential oil has received a special position for the treatment of diseases. Although Satureja rechingeri Jamzad is an endemic species of Iran, unfortunately few studies have been conducted on its biological properties. In this study, along with the analysis of the compounds of Satureja rechingeri essential oil, cytotoxic, antioxidant and antibacterial properties of the essential oil of this species were investigated. The compounds of prepared essential oil were analyzed by GC-FID and GC–MS using Clevenger. Disc diffusion and MTT methods were used to determine the antibacterial activity and cytotoxicity of the essential oil, respectively. The antioxidant activity of the essential oil was measured by two methods of reducing power assay and DPPH free radical scavenging. p-Cymene (46.5%) was the most identified compound in the essential oil. The essential oil showed higher inhibitory effect on seven bacterial strains relative to the standard antibiotics. The studied essential oil showed significant concentration-dependent inhibitory effect on four cancer cells of Vero, SW480, MCF7 and JET3 with 50% lethal effect of 15.6, 125, 15.6 and 250 μg/mL for each line, respectively. The highest adsorption (2.6 nM) was at 500 μg/mL for reducing power assay and 50% free radical inhibition at a concentration of 375 μg/mL for DPPH antioxidant assay. In general, the essential oil of Satureja rechingeri with high antioxidant, antibacterial and anticancer activity can be used as a cheap and affordable natural product in clinical and pharmaceutical fields.

Investigating the Relationship between Multiple Intelligences and professional Identity of Iranian EFL Teachers

( Mitra Alaee ) 범태평양응용언어학회 2015 범태평양응용언어학회지 Vol.19 No.2

The main purpose of the study was to investigate the relationship between Iranian EFL teachers`` Professional Identity and their types of Multiple Intelligences. Moreover, it aimed to see the extent to which their multiple intelligences can predict their professional identity. The participants of the study were 137 Iranian EFL teachers teaching in language schools of Semnan province. Professional identity questionnaire and multiple intelligence survey were used to collect the data. The results of correlation analysis indicated that there is a relationship between language teachers`` professional identity and their type of multiple intelligences, the highest one belonging to kinesthetic intelligence representing a large effect size. The results of linear regression showed that teachers`` multiple intelligence type can predict their professional identity. After, excluding the linguistics intelligence which did not contribute to the regression model significantly, the remaining seven multiple intelligences predicted 63.7 percent of professional identity. Pedagogical implications and suggestions for further studies are presented.