• Title/Summary/Keyword: fast green

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Effects of Irradiation on Color Values of Food Colorants (감마선 조사가 식용색소의 색도에 미치는 영향)

  • Kim Byeong-Keun;Lim Sang-Yong;Song Hyun-Pa;Chung Jin-Woo;Sung Bo-Kyung;Kim Dong-Ho
    • Food Science and Preservation
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    • v.13 no.1
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    • pp.115-118
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    • 2006
  • As a study on the physico-chemical stability of irradiated food and cosmetics, the effect of gamma irradiation on the color values of some food colorants was evaluated. Amaranth, Fast Green FCF, and Indigo Carmine solutions were prepared with different concentration (0.01 and $0.10\%$), gamma irradiated (0.25, 0.5, 1 and 3 kGy), and then Hunters color (L, a, b, ${\Delta}E$) values were determined. The. gamma irradiation process induced decoloration of the coloring agents. In particular, $0.01\%$ solution showed significant differences in the overall color difference$({\Delta}E)$. The lightness (L value) of Amaranth and Indigo Carmine was increased in proportion to irradiation dose, and their redness (a value) and yellowness (b value) also were increased. The redness (a value) and yellowness (b value) of Fast Green FCF $(0.01\%)$ were increased by gamma irradiation. However, there were no significant spectroscopic differences in $0.10\%$ concentrations of the samples.

Enhanced Electro-optical Characteristics of Liquid Crystal Shutter with a Dual Frequency Liquid Crystal Material (이중 주파수 액정을 적용한 액정 셔터의 고속 응답 특성)

  • Kim, Dae Soo;Han, Seung Hwan;Bae, Geon;Jhun, Chul Gyu
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.27 no.5
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    • pp.303-306
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    • 2014
  • In this paper, by using a dual frequency liquid crystal material, we propose a liquid crystal device with a fast response characteristics. The dual frequency liquid crystal material has a positive dielectric anisotropy value at a low frequency. With a high frequency, the dielectric anisotropy becomes negative. Therefore, the relaxation process is governed by not only the elastic deformation, but also the dielectric interaction. The measured decay time and rise time were 0.88 ms and 0.33 ms, respectively.

Fast Switching Properties of TN Cell With Graphene Quantum Dots (그라핀 양자점을 도핑한 TN 셀의 고속 스위칭 특성)

  • Kim, Dai-Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.27 no.2
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    • pp.110-114
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    • 2014
  • In this study, we report the doping effect of graphene quantum dots (QDs) in nematic liquid crystal (NLC) system on rubbed polyimide (PI) surface. The good LC alignment and high thermal stability in QD-LC cell system on rubbed PI surfaces can be measured. Also, the low threshold voltage of QD-TN cell was observed about 2.77 V. The fast response time of 13.2 ms for QD-TN cell can be achieved. Finally, the good voltage holding ratio of QD-TN cell on rubbed PI surface was measured.

Assessment of Fatigue and Fracture on a Tee-Junction of LMFBR Piping Under Thermal Striping Phenomenon

  • Lee, Hyeong-Yeon;Kim, Jong-Bum;Bong Yoo
    • Nuclear Engineering and Technology
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    • v.31 no.3
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    • pp.267-275
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    • 1999
  • This paper deals with the industrial problem of thermal striping damage on the French prototype fast breeder reactor, Phenix and it was studied in coordination with the research program of IAEA. The thermomechanical and fracture mechanics evaluation procedure of thermal striping damage on the tee-junction of the secondary piping using Green's function method and standard FEM is presented. The thermohydraulic(T/H) loading condition used in the present analysis is the random type thermal loads computed by T/H analysis on the turbulent mixing of the two flows with different temperatures. The thermomechanical fatigue damage was evaluated according to ASME code section 111 subsection NH. The results of the fatigue analysis showed that fatigue failure would occur at the welded joint within 90,000 hours of operation. The assessment for the fracture behavior of the welded joint showed that the crack would be initiated at an early stage in the operation. It took 42,698.9 hours for the crack to propagate up to 5 mm along the thickness direction. After then, however, the instability analysis, using tearing modulus, showed that the crack would be arrested, which was in agreement with the actual observation of the crack. An efficient analysis procedure using Green's function approach for the crack propagation problem under random type load was proposed in this study. The analysis results showed good agreement with those of the practical observations.

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Comparison of the Finite Element Analysis and Experimental Result for Green Body Density of Alumina Ceramics (알루미나 압축성형체의 성형밀도와 유한요소 시뮬레이션 결과의 비교)

  • Yook, Young-Jin;Im, Jong-In
    • Journal of the Korean Ceramic Society
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    • v.44 no.4 s.299
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    • pp.235-239
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    • 2007
  • For the pressure compaction process of the ceramic powder, the density distribution is very important for the uniform shrinkages at the sintered body. In this paper, we fabricated alumina green body using compaction process and simulated about same condition. Then comparison of simulation and experimental result confirmed that accuracy of simulation. On the average density of top and lower part was each $2.41g/cm^3,\;2.27g/cm^3$ and deviation at final step was calculated with 0.06 in simulation. Also, experiments show that total density of top and lower part was each $2.59g/cm^3,\;2.36g/cm^3$, and deviation was 0.09. Conclusion, that was not a difference to the simulation and experimental result. The application using the finite element simulation method is possible optimization of the compressing process, predict generated part of cracks and there is a possibility of getting result of more fast, more accurate then existing experience method.

Impacts of Climate Change on Water Crisis and Formation of Green Algal Blooms in Vietnam

  • Thriveni, Thenepalli;Lee, Namju;Nam, Gnu;Whan, Ahn Ji
    • Journal of Energy Engineering
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    • v.26 no.1
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    • pp.68-75
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    • 2017
  • Global warming affects water supply and water resources throughout the world. In many countries, climate change affects significantly on the fresh water resources. Vietnam is exposed mainly, to landslides and floods triggered by tropical storms and monsoon rains, although storm surge, whirlwind, river bank and coastal line erosion, hail rain. In addition to the prevalent drought, there are many major water challenges, including water availability, stress, scarcity and accessibility, because of poor resource management. Fast growth of urbanization, industrialization and population growth, agricultural activities and climate change cause heavy pressure on water quality. Both domestic and industrial wastewater, as well as storm water shares the same drainage. The common facilities for wastewater treatment are not available. Therefore, wastewater is treated only superficially and then discharged directly into rivers and lakes causing serious pollution of surface water environment. In this paper, we reported the severe water crisis and massive green algal blooms formation in Vietnam rivers and lakes. This is the biggest evidence of climate change variations in Vietnam.

A study on Process Characteristics Using Fast Tool Servo based Surface Texturing (FTS 를 이용한 표면처리 방법에 따른 공정특성 연구)

  • Lee, Seung Jun;Lee, Deug Woo;Kim, Jong-Man;Lee, Sang Min;Kim, Mi Ru;Jang, Nam-Su;Li, Liang
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.12
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    • pp.1127-1132
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    • 2014
  • Fast tool servo (FTS) is an enabling technology to fabricate various shapes of functional surface geometries in a precise and controllable manner. FTS can be also employed as a straightforward and efficient surface treatment way of making such products more durable. In this work, process characteristics using high-precision FTS-based surface texturing were qualitatively and quantitatively investigated to provide a class of surface design rule. The morphologies of surfaces processed with different conditions were first examined by observing the resultant 2D/3D surface profiles. In addition, the effects of the surface treatment using FTS on hardness and wear properties were characterized and compared to those without treatment.

Fast Scattered-Field Calculation Using Windowed Green Functions (윈도우 그린함수를 이용한 고속 산란필드 계산)

  • 주세훈;김형동
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2001.11a
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    • pp.7-11
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    • 2001
  • 본 논문에서는 방사 적분방정식의 해를 구하기 위하여 파수영역 웨이블릿 변환개념에 기반을 둔 윈도우 그린함수를 사용하여 파수영역에서 고속으로 산란필드를 계산하는 방법을 제안하였다. 그린함수에 적용된 파수영역 웨이블릿 변환은 공간영역에서 동일한 Q를 갖는 윈도우를 사용하여 필터링함으로써 등가적으로 구현하였다. 고유함수를 이용하여 관찰점을 중심으로 전개된 그린함수를 푸리에 변환한 후 파수영역에서 방사 적분을 계산함으로써 계산효율을 얻을 수 있음을 확인하였다. 관찰영역에서만 정확한 값을 갖는 고유함수로 전개된 그린함수는 그린함수에 윈도우 함수를 씌운 형태로 방사 적분방정식의 파수영역 표현에 적용하면 기존의 고속멀티폴법과 동일한 산란필드 공식을 얻을 수 있다.

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Surface profile measurement with FFT method and stabilized interferometer (안정화된 간섭계와 FFT를 이용한 표면 측정)

  • 류진;김현수;박종락;김진태
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.10a
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    • pp.269-273
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    • 2004
  • The moduled interferometer with waveplates, polarizing beam splitter, etc. for four phase shifted interference patterns was stabilized with the and Fast Fourier Transform (FFT) method was used to investigate the surface profile measurement from the interferenece pattern from Twyman-Green interferometer using a mathcad.

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Real-time simulation on B-spline deformable volume-part III (B-spline volume 변형체의 실시간 시뮬레이션 II)

  • 전성기;조맹효
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2002.10a
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    • pp.70-77
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    • 2002
  • Since our physical world cannot be modeled as rigid body, deformable object models are important. For real-time simulation of elastic object, it must be guaranteed by its exact solution and low-latency computational cost. In this paper, we describe the boundary integral equation formulation of linear elastic body and related boundary element method(BEM). The deformation of elastic body can be effectively solved with 1ow run-time computational costs, using precomputed Green Function and fast low-rank updates based on Capacitance Matrix Algorithm.

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