• Title/Summary/Keyword: double layered

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Sound Insulation Performance of the Side Layered Panels in the Next Generation High Speed Train (차세대 고속철도 차량 측면 적층재의 차음성능)

  • Lee, Joong-Hyeok;Lee, Ho-Jin;Park, In-Seok;Kim, Seock-Hyun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2011.10a
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    • pp.457-462
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    • 2011
  • The sidewall of the HEMU-400x consists of two parts. One is the multi-layered structure including aluminium extruded panel and the other is the double glazed window. When the train runs in a tunnel, the equivalent sound insulation performance of the side wall significantly influences the internal noise levels. In aspect of the sound insulation strategy, it is important to make two parts have similar performance. In this study, the intensity sound transmission loss (ITL) is measured on the specimens of the two parts. Mass law deviation (MLD) is considered in order to compare the sound insulation performance of the two parts in respect of the weight. Contribution of each part to the sound insulation is analyzed and the sound insulation strategy is investigated to reduce the interior noise.

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Transparent conductive oxide layers-embedding heterojunction Si solar cells (투명접합을 이용한 이종 태양전지)

  • Yun, Ju-Hyung;Kim, Mingeun;Park, Yun Chang;Anderson, Wayne A.;Kim, Joondong
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.11a
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    • pp.47.2-47.2
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    • 2011
  • High-efficient transparent conductive oxide (TCO) film-embedding Si heterojunction solar cells were fabricated. An improved crystalline indium-tin-oxide (ITO) film was grown on an Al-doped ZnO (AZO) template upon hetero-epitaxial growth. This double TCO-layered Si solar cell provided significantly enhanced efficiency of 9.23 % as compared to the single TCO/Si devices. The effective arrangement of TCO films (ITO/AZO) provides a good interface, resulting in the enhanced photovoltaic performances. It discusses TCO film arrangement scheme for efficient TCO-layered heterojunction solar cells.

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Double layered Superconductor Wire using Electrophoresis (전기영동법을 이용한 2층 구조 초전도선재 제작)

  • Soh, Dea-Wha;Park, Jung-Cheol;Jeon, Yong-Woo;Li, Ying-Mei;Cho, Yong-Joon;Lim, Byung-Jae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.04a
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    • pp.21-24
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    • 2002
  • In this paper, for the study on the fabrication of YBCO superconductor wire, a double layered YBCO superconductor wire was fabricated by electrophoretic method on metal Ag wire(${\Psi}$0.8 mm). On the basis of previous researches for the fabrication of superconductor wire, the acetone suspension solution with 8 vol.% of 1% PEG(1000) was used and high molecular adhesive was experimentally performed for an improvement of the critical current density of superconductor wire. It was found that the Ag inter-layer deposited on the superconductor wire affect to the state of second YBCO film and its critical current density.

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Intercalation of Vitamer into LDH and Their Controlled Release Properties

  • Choy, Jin-Ho;Son, You-Hwan
    • Bulletin of the Korean Chemical Society
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    • v.25 no.1
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    • pp.122-126
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    • 2004
  • Biofunctional nanohybrids are synthesized from layered double hydroxide (LDH) and the vitamins such as ascorbic acid and topopherol acid succinate. Either ion exchange or copricipitaion leads to successful intercalation of the vitamins into gallery space of LDH that offers a new route to safe preservation of bioactivity as well as controlled release. Intercalations of vitamins are clearly reflected on the increase in the basal spacing of ZnAl-(Nitrate) LDH from 8.5 ${\AA}$ to 10.5 ${AA}$ for ascorbate, and 49.0 ${AA}$ for tocopherol acid succinate, respectively. No significant change in UV-Vis and IR absorption characteristics of the intercalated vitamins strongly supports the safe maintenance of their bioactivities without any deterioration of chemical and structural integrity. Furthermore, it is shown that the hybridized vitamins could be discharged in a controlled kinetics.

Neodymium doped mixed metal oxide derived from CoAl-layered double hydroxide: Considerable enhancement in visible light photocatalytic activity

  • Khodam, Fatemeh;Amani-Ghadim, Hamid Reza;Aber, Soheil;Amani-Ghadim, Ali Reza;Ahadzadeh, Iraj
    • Journal of Industrial and Engineering Chemistry
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    • v.68
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    • pp.311-324
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    • 2018
  • Herein,the Neodymium ion ($Nd^{3+}$) doped CoAl-LDH have been successfully prepared via co-precipitation method and was used as a precursor of Nd-doped CoAl-mixed metal oxides (MMO). The photocatalytic activity of doped LDH and MMO was investigated in the degradation of an azo dye, C.I. Acid Red 14, under visible light irradiation. DRS and PL analysis demonstrated decreasing in the band gap energy and recombination of photo-induced charge carriers of Nd-doped LDH and MMO compared with the pristine CoAL-LDH. Due to significant difference in photocatalytic performance. A power law empirical kinetic model was obtained for predicting the photocatalytic degradation efficiency.

DOUBLESPHERE-RETINOL

  • Ji, Hong-Geun;Jo, Byoung-Kee
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.26 no.1
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    • pp.239-260
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    • 2000
  • The raw materials requiring new technology have been introduced to the market as highly functional cosmetics have been popularized recently. The doublesphere which is the new capsulation is thus born. The deublesphere is double-layered capsulation of which the primary film is the nanocapsulation of liposome and the secondary film is the visible capsulation. The main component of the primary film is lecithin and that of the secondary film is alginlcarrageenanslagarfcellulose. The doublesphere is characterized by that it is possible to keep active beautifying components stable and to improve the moisturizing effect, penetration power into the skin, roughness of the skin, etc. in view of its efficacy and effects since it is double-layered capsulation. The doublesphere-retinol is made in order to measure the stability, efficacy, and effects in the present study.

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Characteristics of Electromagnetic Forces of a Single winding EDS MAGLEV System (단일권선으로 구성된 반발식 자기부상시스템의 전자력특성)

  • Hong, Soon-Heum;Cha, Guee-Soo;Hahn, Song-Yop
    • Proceedings of the KIEE Conference
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    • 1995.07a
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    • pp.62-64
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    • 1995
  • This paper describes the characteristics of electromagnetic forces of Combined superconducting maglev system. Generation of the levitation, the propulsion and the guidance force by a single coil is proved by the phasor- analysis. It is also shown that double-layered configuration has better characteristics in efficiency, pulsation of the forces and drag ratio than single-layered configuration.

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Analytical solutions for mechanical response of circular tunnels with double primary linings in squeezing grounds

  • Wu, Kui;Shao, Zhushan;Hong, Siyuan;Qin, Su
    • Geomechanics and Engineering
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    • v.22 no.6
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    • pp.509-518
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    • 2020
  • Multi-layered primary linings have been proved to be highly effective for tunneling in severe squeezing grounds. But there still has not existed well-established design method for it. Basically, there are two main critical problems in this method, including determinations of allowable deformation and distribution of support stiffness. In order to address such problems, an attempt to investigate the mechanical response of a circular tunnel with double primary linings is performed in this paper. Analytical solutions in closed form for stresses and displacements around tunnels are derived. In addition, the effectiveness and reliability of theoretical formulas provided are well validated by using the numerical method. Finally, based on the analytical solutions, a parametric investigation on the effects of allowable deformation and distribution of support stiffness on tunnel performance is conducted. Results show that the rock pressure and displacement are significantly affected by these two design parameters. It can be found that rock pressure decreases as either allowable deformation increases or stiffness of the first primary lining decreases, but rock displacement shows an opposite trend. This paper can provide a useful guidance for the design of multi-layered primary linings.