• Title/Summary/Keyword: dry aging

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Study on the Application of Dry-Ice Blaster for Development of Automatic Stripe-Line Removal (노면표시 제거 장비 개발을 위한 드라이아이스 블래스터 적용에 관한 연구)

  • Koo, Ja Kyung;Moon, Deuk Soo;Bernold, Leonhard E.;Lee, Tai Si
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.29 no.2D
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    • pp.245-253
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    • 2009
  • Road facility is the most fundamental infrastructure for traffic and various information for smooth traffic is included in road surfaces. Various information included in road surfaces should be often removed and reinstalled by partial damage and aging. In addition, the existing road surface information should be removed in order to mark new information as traffic information changes. The existing road surface removal method suing grinders and torches had problems such as dangerous working equipment and workers' direct exposure to cars. In addition, although water-jet system using super high-pressure water was used to remove road surface in order of improvement of traditional method, there are another problems such as limitations according to water-tanks and water frost on the road surfaces after work. Therefore, this study analyzes and suggests systems to develop prototype after analyzing dry ice blaster in order to improve the current road surface removal methods. In addition, the study analyzes the possibility of introduction of dry ice blaster through a test for proposing an automatized equipment for new road surface mark removal considering environment and work efficiency, and compare traditional method with introduced dry ice blaster for operating cost.

Characteristics Leakage Current of Surface Discharge according to Kaolin Contamination by Deteriorated Polymer Insulators (열화된 고분자애자의 카올린 오손에따른 표면방전특성)

  • Park, Jae-Jun;Ga, Pyung-Hyun;Seo, Ui-Won;Jung, Myeong-Yeon;Song, Il-Kwen;Kim, Hee-Dong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07b
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    • pp.1100-1103
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    • 2004
  • The paper presents the results of using the fundamental and the low frequency harmonic components of leakage current to study aging of EPDM insulator for contaminated condition by kaolin. The largeer the leakage current during 200ms, the higher harmonic component at 60hz. The harmonic component at 60hz and the odd order harmonics is increase relation without Kaolin Conent. Arcing on the surface was always associated with distortion in the leakage current; hence the low frequency components of the leakage currnent can be used as a means to evaluate the surface degration. Both the fundamental and 3rd & 5th harmonics increase dry-band activity.

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A clinical report on the rejuvenate treatment with derma stamp (더마스탬프(Derma stamp)를 이용한 노화 피부 치험례)

  • Seong, Eun-Jin;Jo, Eun-Hee;Park, Min-Cheol
    • The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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    • v.23 no.3
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    • pp.225-235
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    • 2010
  • Background & Objective : Rejuvenate treatment with oriental medicine is popular these days. However, there are few reports about it. This study was performed to evaluate the effect of derma stamp treatment. Derma stamp is a new clinical equipment for Microneedle System. Methods : Restrospective study was conducted. Ten patients were treated for 5 weeks. Follow-up was performed after the treatment with Janus facial analysis system. Satisfaction degree was asked from the patients. Results and Conclusions : Derma stamp treatment was good for skin aging problems like pore, wrinkle, spot, sebum and porphyrin. Especially oily type had better effect than dry type.

Examination of Newsprint Residue as a Plywood Adhesive Filler (합판의 충전제로서 신문용지 잔사의 조사)

  • Oh, Yong-Sung
    • Journal of the Korean Wood Science and Technology
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    • v.24 no.2
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    • pp.42-45
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    • 1996
  • A residue from the newsprint waste was investigated as a filler in adhesive for bonding southern pine plywood. The residue was prepared by drying the wet residue to 8% moisture content and grinding the dry material using a laboratory Wiley mitt with a 75-${\mu}m$(200-mesh) screen. The residue was compared to a commercial filler commonly used in structural plywood adhesives. A total of 48 three-ply panels. 12.7mm nominal thickness and 0.3 by 0.3 m in size, were fabricated at two press times(4 and 5 min) and three assembly times(20, 40 and 60 min). Evaluations of the residue were carried out by performance tension shear tests after two 4-hour boil accelerated aging tests on plywood. The test results included tension shear strength and estimated wood failure values. All plywood made with the residue filler were comparable to the control-bonded plywood. These results indicate that residue from the newsprint waste streams would be suitable as filler for plywood adhesives.

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Durability and Evaluation of Plastic Insulator for the Outdoor (옥외용 프라스틱 애자의 내구성과 평가)

  • 조한구;강동필;한동희;김인성
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 1993.10a
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    • pp.97-102
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    • 1993
  • The application of epxy composite materials for the outdoor insulating systems has some significant advan-tages compared with conventional inorganic materials, that is low weight in combination with high mechanical strength, small dimensions and design versatility. The paper describes the results of high voltage investigations carried out different aging types of epoxy resin insulator and silicone grease coating. The insulators have been exposed 3000 hours to weather-o-meter and 12 months to outdoor. In this connection, the main study of paper is form the basis of develop-ment of principal technologies of epoxy composites which ard: (1)manufacturing of insulator, (2)high vol-tage testing under dry and wet condition, (3)mechani-cal properties, (4)accelerated weather-ometer test and outdoor exposed, artificial polution.

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A Study on the Thermal Aging and SOx Poisoning Characteristics on Alumina Supported Silver Catalyst under Diesel Engine Emission Condition (디젤엔진 배기가스조건하에서의 Pt 및 Ag 담지 알루미나 촉매의 열적 노화 특성과 SOx 피독 특성에 관한 연구)

  • 신병선
    • Journal of Korean Society for Atmospheric Environment
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    • v.16 no.2
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    • pp.199-208
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    • 2000
  • In this study we investigated on the possibility of platinum and silver catalysts as de-NOx catalyst for activity test of supported metal oxide catalysts. the study was performed with the change of amount of metal and support types. The catalyst was prepared the activity of alumina supported silver catalyst produced by dry and wet impregnation method respectively and the resistance of sulfur for optimum supported silver catalyst,. As a result the activity of alumina supported platinum catalyst was showed at low temperature region but the case of silver catalyst activated at high temperature region. So we finally chose alumina supported silver catalyst as de-NOx target catalyst because alumina supported catalyst showed higher activity than alumina supported platinum catalyst.

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The Effect of Contaminants on Tracking Aging in Polymer Insulating Materials (고분자 절연재료의 트랙킹 열화에 미치는 오손액의 영향)

  • 조한구;박용관
    • Electrical & Electronic Materials
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    • v.10 no.8
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    • pp.770-777
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    • 1997
  • Some polymer materials including epoxy resin are being instead of porcelain for outdoor insulating materials such as insulators bushings cable terminators and surge arrester housing. And the largest problem to be overcomed is the tracking and erosion of the outdoor polymer material brought about by dry band arcing during prolonged exposure to contaminations. In this paper the effect of surface tension wettability flow rate of contaminants with varying surfactant content and frequency of applied voltage on the tracking breakdown of epoxy insulating materials were investigated. As the flow rate of contaminant is increased the surface resistivity is decreased and the leakage current is increased the time to tracking breakdown is decreased. It is found that time to tracking breakdown depends on the surface tension of contaminant that is difference of wettability. And as the frequency of applied voltage is increased time to tracking breakdown decreased.

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Flashover Failure of Polymer Insulator in Distribution Lines (배전용 폴리머애자의 섬락고장)

  • 한재홍;이병성;김찬영;윤태상
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.767-770
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    • 2000
  • This study was investigated for searching a cause of flashover failure of polymer insulator and preparing countermeasures. Hydrophobicity, microstructure and chemical structural change of polymer weathershed were studied by polymer characterization methods. In addition, the electrical properties such as power frequency dry flashover voltage/impulse voltage tests, contamination characteristics were carried out. The hydrophobicity of polymer weathershed was decreased significantly and cracks were observed on the surface. Also, the electrical characteristics did not satisfy the KEPCO specification. The failed polymer insulators showed the more leakage current than 4 years service-aged ones. From the result, it can be concluded that the flashover failure of polymer insulator was attributed to the surface aging and severe contamination.

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Clinical Evidence of Effects of Lactobacillus plantarum HY7714 on Skin Aging: A Randomized, Double Blind, Placebo-Controlled Study

  • Lee, Dong Eun;Huh, Chul-Sung;Ra, Jehyeon;Choi, Il-Dong;Jeong, Ji-Woong;Kim, Sung-Hwan;Ryu, Ja Hyun;Seo, Young Kyoung;Koh, Jae Sook;Lee, Jung-Hee;Sim, Jae-Hun;Ahn, Young-Tae
    • Journal of Microbiology and Biotechnology
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    • v.25 no.12
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    • pp.2160-2168
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    • 2015
  • The beneficial effects of probiotics are now widely reported, although there are only a few studies on their anti-aging effects. We have found that Lactobacillus plantarum HY7714 (HY7714) improves skin hydration and has anti-photoaging effects, and in the present study, we have further evaluated the anti-aging effect of HY7714 via a randomized, double blind, placebo-controlled clinical trial. The trial included 110 volunteers aged 41 and 59 years who have dry skin and wrinkles. Participants took 1 × 1010 CFU/day of HY7714 (probiotic group) or a placebo (placebo group) for 12 weeks. Skin hydration, wrinkles, skin gloss, and skin elasticity were measured every 4 weeks during the study period. There were significant increases in the skin water content in the face (p < 0.01) and hands (p < 0.05) at week 12 in the probiotic group. Transepidermal water loss decreased significantly in both groups at weeks 4, 8, and 12 (p < 0.001 compared with baseline), and was suppressed to a greater extent in the face and forearm in the probiotic group at week 12. Volunteers in the probiotic group had a significant reduction in wrinkle depth at week 12, and skin gloss was also significantly improved by week 12. Finally, skin elasticity in the probiotic group improved by 13.17% (p < 0.05 vs. controls) after 4 weeks and by 21.73% (p < 0.01 vs. controls) after 12 weeks. These findings are preliminary confirmation of the anti-aging benefit to the skin of L. plantarum HY7714 as a nutricosmetic agent.

Effects of Aging and Soil Texture on Composting of Diesel-Contaminated Soil (디젤오염기간 및 토성이 오염토양 콤포스팅 처리에 미치는 영향)

  • Choi, Jung-Young;Namkoong, Wan;Park, Joon-Seok;Hwang, Eui-Young
    • Journal of the Korea Organic Resources Recycling Association
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    • v.10 no.2
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    • pp.132-139
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    • 2002
  • This study was carried out to investigate the effects of aging and soil texture on composting of diesel-contaminated soil. The soils used for this study were silt loam and sand. Target contaminant, diesel oil, was spiked at 10,000mgTPH/kg of dry soil. Aging times of diesel-contaminated soils were 15days and 60days, respectively. Fresh diesel-contaminated soil was also investigated. Moisture content was controlled to 70% of soil field capacity. Mix ratio of soil to sludge was 1:0.3 as wet weight basis. Temperature was maintained at $20^{\circ}C$ Volatilization loss of TPH was below 2% of initial concentration. n-Alkanes lost by volatilization were mainly by the compounds of C10 to C17. Diesel in contaminated soil was mainly removed by biodegradation mechanism. First order degradation rate constant of TPH in sandy soil was ranged from 0.081 to 0.094/day, which is higher than that in silt loam(0.056-0.061/day). From fresh to 60day-aged soils, there was little difference of TPH biodegradation rate between the soils. Carbon recovery ranged from 0.61 to 0.89. TPH degradation rate was highly correlated with $CO_2$ production rate.

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