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.

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.

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

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

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.

Dosimetric and Microdosimetric Characteristics of 9.6 to 30α-MeV Proton Beams

Mitra Ghergherehchi,채종서,Hossein Afarideh,Ahmad Mohammadzadeh 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.5

High and intermediate energy protons are not able to directly form a track in an etch detector (TED). Such detectors can, however, be used for the detection and dosimetry of beams of these particles through the registration of secondary charged particles with sufficiently high values of linear energy transfer (LET).Intermediate energy protons (10 to 30 MeV) with low LET values ranging from 5.87 down to 2.40 keV/탆 are considered. Although the LET values are low, this energy range seems to be sufficient to create secondary particles with much higher LET values through nuclear reactions in the irradiated matter. This phenomenon can modify the characteristics of the energy transfer process due to these particles, and it should be taken into account when such particles are used for radiobiology and/or radiotherapy studies. The importance of these secondary particles was studied experimentally by means of a LET spectrometer based on a chemically etched track detector, in which the tracks of the primary protons are not revealed. These studies were performed with protons whose primary energies were in the range of about 10 to 30 MeV, which are available at the Cyclotron Accelerator Department of Nuclear Research Center for Agriculture and Medicine (NRCAM) in Karaj, Iran. The microdosimetric distributions of the secondary particles mentioned above are presented, and their contributions to the absorbed dose of the primary protons are estimated. The contribution of the secondary particle dose increases with decreasing proton energy. The importance of this phenomenon in some applications is discussed. The origin of the secondary particles in interactions with protons having high and intermediate energies due to various nuclear reactions was calculated by using the Alice computer code. There is good agreement between the experimentally obtained and theoretically calculated results.

Evaluation of Mechanical and Rheological Properties of Metronidazole Gel as Local Delivery System

Mitra Jelvehgari,Hassan Montazam 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.6

Rosacea is a chronic multifactorial vascular skin disorder that affects about 10 percent of the general population. Metronidazole is an effective antibiotic in the treatment of moderate-tosevere rosacea. Metronidazole is a suitable drug in cases of resistance to tetracycline or erythromycin, but it has also been shown that oral metronidazole may increase the side effects (e.g.,peripheral neuropathy). Oral metronidazole should not be used for more than three months, and hence topical metronidazole gel is the best therapeutic choice in rosacea (especially during pregnancy). This study examined the mechanical (adhesiveness, cohesiveness, extrudability, spreadability, homogeneity) and rheological (viscosity), skin irritant and drug release properties of different metronidazole gel formulations that contain anionic emulsifying wax, glycerin and lactic acid in different proportions. The release studies were conducted using Franz diffusion cells and Silastic membrane as a barrier. The results indicated that gel compressibility, hardness, and adhesiveness, are the factors that influence the ease of gel removal from the container, ease of gel application onto the mucosal membrane, and gel bioadhesion. The findings showed that there exists a strong negative correlation between the spreadability of a formulation and its cohesiveness, the spreadability of a formulation is inversely proportional to its cohesiveness. However, sorbitol solution (70%) concentration was not significantly correlated with drug release. In addition, drug release was significantly reduced as the concentration of anionic emulsifying wax increased and the concentration of lactic acid decreased. The maximum metronidazole release was achieved at a pH of 4-6. Data obtained from in vitro release studies were fitted to various kinetic models and high correlation was obtained in the Higuchi and first order models. The results showed that all the gel formulations showed good extrudability, viscosity, cohesiveness, homogeneity and spreadability.

Micromeritics and Release Behaviours of Cellulose Acetate Butyrate Microspheres Containing Theophylline Prepared by Emulsion Solvent Evaporation and Emulsion Non-solvent Addition Method

Mitra Jelvehgari,Fatemeh Atapour,Ali Nokhodchi 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.7

The present research work compares the effect of microsphere preparation technique on micromeritics and release behaviors of theophylline microspheres. Microspheres were prepared by oil-in oil (O1/O2) emulsion solvent evaporation method (ESE) using different ratios of anhydrous theophylline to cellulose acetate butyrate (CAB). Cyclohexane was used as non-solvent to modify the ESE technique (MESE method) and the effect of non-solvent volume on properties of microspheres was investigated. The obtained microspheres were analyzed in terms of drug content, particle size and encapsulation efficiency. The morphology of microsphere was studied using scanning electron microscope. The solid state of microspheres, heophylline and CAB were investigated using X-ray, FT-IR and DSC. The drug content of microspheres prepared by MESE method was significantly lower (15.54% ± 0.46) than microspheres prepared by ESE method (41.08 ± 0.40%). The results showed that as the amount of cyclohexane was increased from 2 mL to 6 mL the drug content of microspheres was increased from 15.54% to 28.71%. Higher encapsulation efficiencies were obtained for microspheres prepared by ESE method (95.87%) in comparison with MESE method (64.71%). Mean particle size of microsphere prepared by ESE method was not remarkably affected by drug to polymer ratio, whereas in MSES method when the volume of cyclohexane was increased the mean particle size of microsphere was significantly decreased. The ratio of drug to polymer significantly changed the rate of drug release from microspheres and the highest drug release was obtained for the microsphere with high drug to polymer ratio. The amount of cyclohexane did not significantly change the drug release. Although, x-ray showed a small change in crystallinity of theophylline in microspheres, DSC results proved that theophylline in microspheres is in amorphous state. No major chemical interaction between the drug and polymer was reported during the encapsulation process.

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.

Petrochemical wastewater treatment and reuse by MBR: A pilot study for ethylene oxide/ethylene glycol and olefin units

Mitra Bayat,Mohammad Reza Mehrnia,Mostafa Hosseinzadeh,Reza Sheikh-Sofla 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-

This study aims to investigate the technical feasibility of employing membrane bioreactor (MBR) as a practical approach for ethylene oxide/ethylene glycol (EO/EG) and olefin units wastewater treatment in a petrochemical complex. EO/EG unit wastewater mainly contains ethylene glycol and acetaldehyde and olefin unit wastewater includes benzene and ethyl benzene, with COD concentration of 1900 900 mg/L and 900 300 mg/L, respectively. Experimental studies of MBR pilot plants with volume of 2.5 m3 were carried out during 6 months in different HRTs and various mixed ratios of EO/EG to olefin unit wastewater. Results revealed that using MBR, COD removal efficiency of 97.5% is accomplished in HRT of 13.5 h for EO/EG and 85% in HRT of 18 h for olefin wastewater. For the mixed ratio of 2/1 and in HRT of 18 and 24 h, COD removal efficiency of 93.5% and 96% was achieved, respectively. Membrane fouling was analyzed at different MLSS concentrations. The results at optimum MLSS of 8 g/L revealed that fouling resistance is mainly due to the membrane pore blocking, and cake and gel resistances contribute less to membrane fouling. Results indicated that MBR is a promising technology for treatment of high fluctuation toxic components in petrochemical wastewater.

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.