• Title/Summary/Keyword: effective diffusion

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The Diffusion and Use of RFID Technology in India

  • Bhatt, Nityesh;Cho, Namjae
    • Asia-Pacific Journal of Business
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    • v.2 no.2
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    • pp.36-60
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    • 2011
  • Radio frequency identification(RFID) is a system of technology that transmits digitally coded identity information in the form of a unique serial number of an object or person wirelessly, using radio waves. The primary use of RFID has been in asset tracking. This makes it highly useful across various industries for effective and efficient conduct of different business processes like supply chain management (SCM). As the use of RFID expands, the use of this technology is observed in such industries as transportation, traffic payment, hospital and medical care, education, and retail. Although this technology offers immense potential, it faces multifarious roadblocks, particularly in developing countries like India. Under this backdrop, this paper attempts to present an overview of the use and application RFID technology in India with a highlight on business-ecosystem for RFID in India. We also present various technical and non-technical challenges in the implementation of RFID in India.

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The Dissolving Reaction of Solid Iron with Molten Zinc (고체철-용융아연의 용해반응)

  • Yoon, Byung-Ha;Chung, In-Sang;Park, Kyung-Chae
    • Journal of the Korean institute of surface engineering
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    • v.9 no.2
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    • pp.1-7
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    • 1976
  • The dissolving and growth kinetics of intermetallic compounds for the reaction between solid iron and molten zinc were studied under nitorgen atmosphere over the temperature range between470$^{\circ}C$ and 680$^{\circ}C$. The rates of dissolution of solid iron into molten zinc were obtained under a static conditon, The amount of dissolution of sold iron and the growth of intermetalic compounds could be determined by means of microscopy. The thickness of intermetallic compound at a given temperature increases with increasing time, whereas for a given time decreases with increasing temperature . The rate of dissolution is controlled by the diffusion process of iron in the effective boundary layer of molten zinc over the temperature range 470$^{\circ}$-530$^{\circ}C$, 570$^{\circ}$-620$^{\circ}C$, and 650$^{\circ}$-665$^{\circ}C$, while by the surface reaction over the range 530$^{\circ}$-570$^{\circ}C$ and 620$^{\circ}$-650$^{\circ}C$.

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A Study on Natural Dyeing (5) - Adsorption Properties of Berberine for Silk Fabrics - (천연염색에 관한 연구(5) - 황벽색소 베르베린의 견에 대한 염착특성 -)

  • Kim, Hye In;Park, Su Min
    • Textile Coloration and Finishing
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    • v.14 no.2
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    • pp.85-85
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    • 2002
  • The interaction between berberine and tannin in aqueous solution was investigated spectrophotometerically. The dyeing mechanism of silk fabrics (control and tannin treated silk fabrics) with berberine was based on thermodynamic parameters obtained from equilibrium adsorption experiments. In adsorption spectra of aqueous solution of berberine and tannin mixture two isosbestic points (328nm, 357nm) were found and the mole fraction of reaction of components was 1:1. Initial dyeing rates were increased and the diffusion of dye was more effective by tannin treatment. Without regard to tannin treatment the adsorption isotherm of berberine was the langmuir type except high temperature, 80℃. By tannin treatment the saturation dye uptake was increased, the increase of dye uptake appeared to be a result of entropy change rather than enthalpy change. All these results can be interpreted by the hydrophobic interaction between berberine and silk treated with tannin and it is reasonable to conclude that not only the ionic force, but also the hydrophobic interaction contributes to the binding of berberine and tannin treated silk treated with tannin.

A Study on Natural Dyeing (5) - Adsorption Properties of Berberine for Silk Fabrics - (천연염색에 관한 연구(5) -황벽색소 베르베린의 견에 대한 염착특성 -)

  • 박수민;김혜인
    • Textile Coloration and Finishing
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    • v.14 no.2
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    • pp.9-17
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    • 2002
  • The interaction between berberine and tannin in aqueous solution was investigated spectrophotometerically. The dyeing mechanism of silk fabrics (control and tannin treated silk fabrics) with berberine was based on thermodynamic parameters obtained from equilibrium adsorption experiments. In adsorption spectra of aqueous solution of berberine and tannin mixture two isosbestic points (328nm, 357nm) were found and the mole fraction of reaction of components was 1:1. Initial dyeing rates were increased and the diffusion of dye was more effective by tannin treatment. Without regard to tannin treatment the adsorption isotherm of berberine was the langmuir type except high temperature, $80^\circ{C}$. By tannin treatment the saturation dye uptake was increased, the increase of dye uptake appeared to be a result of entropy change rather than enthalpy change. All these results can be interpreted by the hydrophobic interaction between berberine and silk treated with tannin and it is reasonable to conclude that not only the ionic force, but also the hydrophobic interaction contributes to the binding of berberine and tannin treated silk treated with tannin.

Simulation Model for Drying Characteristics of Batch-type Tunnel Dryer (배치식 터널 건조기의 고추 건조 시뮬레이션 모델 연구)

  • 황규준;고학균;홍지향;김종순
    • Journal of Biosystems Engineering
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    • v.25 no.2
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    • pp.89-96
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    • 2000
  • In this study, experiments were performed for various drying air temperatures, air flow rates tray distance to analyze drying characteristics of batch type tunnel dryer. In comparison of tunnel drying with cabinet drying which is currently used in the farm, the results of drying simulation model of cabinet dryer was used and then the possibility of applying the drying simulation model of cabinet dryer to batch type tunnel dryer was investigated. The results showed that as the drying temperature increased, the drying rte and moisture difference in the direction of air flow increased and as the air flow rate increased, the drying rate increased and moisture differences decreased. In tunnel dryer, drying through bottom of the tray had large effect on drying rate and the effect was more significant when the drying temperature increased. As air flow rate increased, the difference of drying rates between tunnel and cabinet drying increased and drying rate of tunnel of drying was higher. The drying simulation model could estimate moisture content in tunnel more precisely by using modified effective moisture diffusion coefficient for air flow rate.

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Anti-inflammatory and Anti-bacterial Effects of Aloe vera MAP against Multidrug-resistant Bacteria

  • Choi, Sang Hwa;Shin, Hea Soon
    • Natural Product Sciences
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    • v.23 no.4
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    • pp.286-290
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    • 2017
  • Multidrug-resistant Acinetobacter baumannii and Pseudomonas aeruginosa are highly dangerous nosocomial pathogens, cause the symptoms of skin infections, pressure sores, sepsis, blood stream and wound infections. Unfortunately, these pathogens are immune to the most common antibiotics, such as, carbapenem, aminoglycoside and fluoroquinolone. Therefore, it is imperative that new and effective antibiotics be developed. In the present study, the antimicrobial effects of Aloe vera MAP (modified Aloe polysaccharide) on Staphylococcus aureus and Bacillus subtilis, Escherichia coli and Enterobacter aerogenes, and clinical Pseudomonas aeruginosa and clinical Acinetobacter baumannii were comprehensibly investigated. Prior to the growth inhibition effect measurement and antibiotic disc diffusion assay on gram-positive and gram-negative bacteria and selected multidrug-resistant Pseudomonas aeruginosa and Acinetobacter baumannii, antimicrobial resistance screening was performed for the multidrug-resistant bacteria obtained from clinical isolates. The results for showed the Aloe vera MAP had a concentration-dependent effect on all of examined bacteria, particularly on Pseudomonas aeruginosa. Anti-inflammatory and anti-oxidant experiments were also performed dose dependently effects to confirm the beneficial physiological effects of Aloe vera MAP.

The Effect of Dynamic Strain Aging on the High Temperature Plastic Deformation Behaviour of Al-Mg Alloy (Al-Mg 합금의 고온 소성 변형 특성에 미치는 동적 변형 시효의 영향)

  • 이상용;이정환
    • Transactions of Materials Processing
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    • v.5 no.4
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    • pp.327-336
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    • 1996
  • The effect of dynamic strain aging on high temperature deformation behaviour of the A-Mg alloy was investigated by strain rate change tests and stress relaxation tests between 20$0^{\circ}C$and 50$0^{\circ}C$. Yield point, short stress transient and periodic discontinuities on the stress-strain curve were considered as an evidence of the effect of dynamic strain aging. With this criterion two distinct strain rate-temperature regimes could be manifested. Dynamic strain aging was considered to be effective in the high temperature-low strain rate regime, whereas dynamic recovery was a dominant deformation mechanism in the low temperature-high strain rate regime. It was found that dynamic strain aging in the high temperature deformation was governed by the mechcanism of diffusion-controlled, viscous dislocation movement.

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Antifungal Activity of Borneolum (Borneo-Camphor) from Dryobalanops aromatica against Malassezia furfur (Dryobalanops aromatica 유래 용뇌의 Malassezia furfur에 대한 항균 활성)

  • Kim Young-ju;Hwang Guen-bae;Seu Young-Bae
    • Microbiology and Biotechnology Letters
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    • v.33 no.3
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    • pp.236-239
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    • 2005
  • Ethyl acetate extracts of traditional medicinal herbs were screened for their antifungal activity against Malassezia furfur through the liquid growth inhibition method with 96 well plate and the paper disk agar diffusion assay. Among the 91 kinds of herbal solvent extracts, borneolum (borneo-camphor, No. 56) was finally selected as the best antifungal effective medicinal herb. The MIC value of No. 56 against M. furfur was 0.3 mg/ml ($8.2{\times}10^6$ CFU/ml) and it was three times more efficient than midazole which is the known antifungal agent in clinical medicines.

Study on the Application of Ion-nitrided Treatment to Improve the Mechanical Properties of Carbon Steel (회소강의 기계적 성질을 개선하기 위한 이온질화 처리의 응용에 관한 연구)

  • 강명순;윤종학;이원평
    • Journal of the korean Society of Automotive Engineers
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    • v.9 no.2
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    • pp.28-33
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    • 1987
  • This thesis is to improve the mechanical properties of carbon steel by the ion-nitriding, and post-heat treatment. The structures of ion-nitrided SM45C steel were changed to martensite by quenching from 730.deg. C and 800.deg. C. And then a few of the quenched specimens was tempered at 200.deg. C for 120 min. The emphasis in this study is focussed on Comparison of hardness and fatigue strength with the ion-nitrided steel. The results obtained are summerized as follows. 1. To improve the hardness and fatigue strength of ion-nitrided steels, it is effective to under take diffusion treatment for a short time at the austenite temperature(800.deg. C). 2. If ion-nitrided steel is heated for a long time at high temperature, de-nitriding occure. 3. The quenching treatment after nitriding on the carbon steel is necessary to improve the mechanical properties of the steels.

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Fabrication of an Electrostatic Micro Actuator Using p+ Diaphragm As an Electrode (p+ 박막을 전극으로 한 정전형 마이크로 구동기의 제작)

  • Han, Sang-Woo;Yang, Eui-Hyeok;Yang, Sang-Sik
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.141-143
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    • 1994
  • In this paper, an electrostatic micro-actuator is fabricated using flat p+ diaphragm. To avoid the buckling of the flat p+ diaphragm, the processes are designed appropriately. The fabrication processes of the actuator are the anisotropic etching with EPW, the boron diffusion process, Al deposition and the silicon to glass bonding using the negative photoresist. The distance between the p+ and Al electrodes is $10{\mu}m$, and the thickness of the p+ diaphragm is $2{\mu}m$. The measurement of the characteristic of the actuator is performed at 50V. The center displacement of the diaphragm is $1.5{\mu}m$ at 10Hz. In comparison with the experimental data of the actuator with corrugated diaphragm, it is confirmed that the actuator with flat diaphragm is more effective than that with corrugated one in the small deflection region.

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