• Title/Summary/Keyword: absorption loss ($L_a$)

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A Finite-element Method Analysis of Electromagnetic Noise Absorption in a Coplanar Transmission Line Integrated with a Magnetic Film

  • Sohn, Jae-Cheon;Han, Suk-Hee;Lim, Sang-Ho
    • Journal of Magnetics
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    • v.11 no.2
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    • pp.90-94
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    • 2006
  • A finite-element method is used to analyze loss generation and electromagnetic noise absorption characteristics of a coplanar waveguide transmission line integrated with a magnetic thin film. Parameters used in the analysis are the electrical resistivity of the magnetic layer and the thickness of both magnetic and insulating layers. The results indicate that L-C resonance is the main loss mechanism of the electromagnetic noise absorption.

SYNERGISTIC SKIN PROPERTY INTERACTIONS BETWEEN ALPHA HYDROXY ACID AND SKIN MOISTURIZER IN A HAND DISHWASHING DETERGENT

  • Brumbaugh, E.H.;Sigler, M.L.;Casterton, P.L.;Dornoff, M.
    • Proceedings of the SCSK Conference
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    • 2003.09a
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    • pp.491-497
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    • 2003
  • The use of both an Alpha Hydroxy Acid, Citric Acid, and a Skin Moisturizer, Glycereth-26, formulated into a hand dishwashing detergent have been shown to be synergistic in their effects on certain skin health parameters. Each ingredient was evaluated alone and together in a hand dishwashing detergent via a 9-week use test. Panelists washed dishes using the sponge method commonly used in Asian markets and a 1:7 dilution of the concentrated dish detergent. Panelist's hands were evaluated initially and at 3-week intervals for nine weeks. After nine weeks panelist's hands showed significant improvements in Moisture Absorption and Transepidermal Water Loss (TEWL). A synergistic effect on TEWL was found between the AHA and the Moisturizer. These effects, showing an improvement in the condition of the panelist's skin are impressive, particularly since they were observed from a dishwashing product that is highly diluted and at near neutral pH during the washing process.

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SYNERGISTIC SKIN PROPERTY INTERACTIONS BETWEEN ALPHA HYDROXY ACID AND SKIN MOISTURIZER IN A HAND DISHWASHING DETERGENT

  • Brumbaugh, E.H.;Sigler, M.L.;Casterton, P.L.;Dornoff, J.M.
    • Proceedings of the SCSK Conference
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    • 2003.09b
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    • pp.417-423
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    • 2003
  • The use of both an Alpha Hydroxy Acid, Citric Acid, and a Skin Moisturizer, Glycereth-26, formulated into a hand dishwashing detergent have been shown to be synergistic in their effects on certain skin health parameters. Each ingredient was evaluated alone and together in a hand dishwashing detergent via a 9-week use test. Panelists washed dishes using the sponge method commonly used in Asian markets and a 1:7 dilution of the concentrated dish detergent. Panelist's hands were evaluated initially and at 3-week intervals for nine weeks. After nine weeks panelist's hands showed significant improvements in Moisture Absorption and Transepidermal Water Loss (TEWL). A synergistic effect on TEWL was found between the AHA and the Moisturizer. These effects, showing an improvement in the condition of the panelist's skin are impressive, particularly since they were observed from a dishwashing product that is highly diluted and at near neutral pH during the washing process.

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Exploiting W. Ellison model for seawater communication at gigahertz frequencies based on world ocean atlas data

  • Tahir, Muhammad;Ali, Iftikhar;Yan, Piao;Jafri, Mohsin Raza;Jiang, Zexin;Di, Xiaoqiang
    • ETRI Journal
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    • v.42 no.4
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    • pp.575-584
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    • 2020
  • Electromagnetic (EM) waves used to send signals under seawater are normally restricted to low frequencies (f) because of sudden exponential increases of attenuation (𝛼) at higher f. The mathematics of EM wave propagation in seawater demonstrate dependence on relative permeability (𝜇r), relative permittivity (𝜀r), conductivity (𝜎), and f of transmission. Estimation of 𝜀r and 𝜎 based on the W. Ellison interpolation model was performed for averaged real-time data of temperature (T) and salinity (S) from 1955 to 2012 for all oceans with 41 088 latitude/longitude points and 101 depth points up to 5500 m. Estimation of parameters such as real and imaginary parts of 𝜀r, 𝜀r', 𝜀r", 𝜎, loss tangent (tan 𝛿), propagation velocity (Vp), phase constant (𝛽), and α contributes to absorption loss (La) for seawater channels carried out by using normal distribution fit in the 3 GHz-40 GHz f range. We also estimated total path loss (LPL) in seawater for given transmission power Pt and antenna (dipole) gain. MATLAB is the simulation tool used for analysis.

Mass Transfer and Hydraulic Kinematic Character Using Lattices Packings by Countercurrent Flow of Gas-Liquid Phase in Packing Column (격자형 충진물을 이용한 충진탑내 기액상의 역류에 의한 물질전달과 수력학적 동특성)

  • Kim, Jang-Ho;Ha, Sang-An
    • Journal of Ocean Engineering and Technology
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    • v.2 no.2
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    • pp.130-137
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    • 1988
  • This thesis introduced that character of a treatment technique for a mading synthetic resin Hifiow-Ring. The material system of packings make an experiment air$NH_{3}$/air$H_{2}SO_{4}$, $SO_{2}$-air/NaOH, $NH_{3}$-air/$/H_{2}SO_{4}$ under general conditions. Lattices packing compared with conventional packings was proved low pressure loss and high separation efficiency for high loading per trans unit. And an inflow materal tested for absorption and rectification, it made an experiment under a range regular temperature, low energy and small amount of money. That made possible in simple equation, volume material tranfer coefficient$\beta_{L}$ . a by absorption or $\beta_{V}$ .a calculated in all range loading. The peculiarity pressure loss $\Delta\;P/NUT_{ov}$ for Hiflow-ring contributed to a fall cost of energy, a grade number of a vacuum rectification and absorption calculation.

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Effect of SiO2 Antireflection Coating on the Si Solar Cell (Si 태양전지에서 SiO2 광반사 방지막의 처리 효과)

  • Chang Gee-Keun;Lim Yong-Keu;Hwang Yong-Woon;Cho Jae-Uk
    • Korean Journal of Materials Research
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    • v.14 no.2
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    • pp.152-156
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    • 2004
  • We have studied the effective optical absorption power of Si solar cell with $SiO_2$-antireflection layer based on a mathematical modelling of AM(air mass)1 spectrum and Si refractive index in the wavelength range(0.4 $\mu\textrm{m}\leq$λ$\leq$$0.97\mu\textrm{m}$). The effective optical absorption power obtained from the theoretical calculation was 450 and 520 W/$\m^2$ for the Si solar cells with $SiO_2$-antireflection layer of 500$\AA$ and 1000$\AA$, respectively. The optimum thickness of $SiO_2$-antireflection layer showing the minimum reflection loss was about 1000$\AA$ in the computer simulation. Two kinds of Si solar cells named EBS(500$\AA$) and EBS(l000$\AA$) were fabricated to evaluate the effect of $SiO_2$-antireflection layer thickness on the optical absorption. The epitaxial base Si cell with $SiO_2$-antireflection layer of 1000$\AA$ [EBS(l000$\AA$)] showed the output power improvement of about 15% upon the EBS(500$\AA$) cell due to larger absorption of effective optical power under illumination of AM1, 1 sun.

Magnetic Resonance and Electromagnetic Wave Absorption of Metamaterial Absorbers Composed of Split Cut Wires in THz Frequency Band (THz 대역에서 Cut Wire로 구성된 메타소재의 자기공진 및 전파흡수특성)

  • Ryu, Yo-Han;Kim, Sung-Soo
    • Journal of the Korean Magnetics Society
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    • v.27 no.2
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    • pp.49-53
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    • 2017
  • Metamaterials composed of split cut wire (SCW) on grounded polyimide film substrate have been investigated for the aim of electromagnetic wave absorbers operated in THz frequency band. Reflection loss and current density distributions are numerically simulated with variations of the SCW geometries using the commercial software. The minimum reflection loss lower than -20 dB has been identified at 5.5~6.5 THz. The simulated resonance frequency and reflection loss can be explained on the basis of the circuit theory of an inductance-capacitance (L-C) resonator. Dual-band absorption can be obtained by arrangement of two SCWs of different length on the top layer of the grounded substrate, which is due to multiple magnetic resonances by scaling of SCWs. With increasing the side spacing between SCWs, a more enhanced absorption peak is observed at the first resonance frequency that is shifted to a lower frequency.

Robust Controller Design of Multivariable Plant using Sensitivity Minimization (감도 최소화 기법을 이용한 다변수 플랜트의 강인한 제어기 설계)

  • 이원규;김영달
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.7 no.6
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    • pp.42-50
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    • 1993
  • In this paper the affect an inorganic filler and a f i n g up water absorption in epoxy composite material was represented. The results are summarized as follows ; 1. In the case of Sample 1, Sample 2 and a fillng up water absorption, the frequency depenence of E,' shows the straight characteristic underl4O0C. 2. Between lOOHz and 3kHz, the frequency dependency of tan8 is dominated by the loss of a dipole relaxation than the conductive loss for movement of a career. The effect of water absorption, is increased as the frequency is d e creased.

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The Dielectric Characteristics Epoxy Composite Material for Electric Installation (전기설비용 Epoxy 복합재료의 유전특성)

  • 이보호;박동화;이병기
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.7 no.2
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    • pp.51-56
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    • 1993
  • In this paper the affect an inorganic filler and a filling up water absorption in epoxy composite material was represented. The results are summarized as follows; 1. In the case of Sample 1, Sample 2 and a fillng up water absorption, the frequency depenence of ${\varepsilon}_\tau$ shows the straight characteristic under $140^{\circ}C$. 2. Between lOOHz and 3kHz, the frequency dependency of $tan{\delta}$ is dominated by the loss of a dipole relaxation than the conductive loss for movement of a career. The effect of water absorption, is increased as the frequency is decreased.

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Synthesis and Properties of Conjugated Polycarbosilanes with 1,4-Bis(thiophene or phenylene)-buta-1,3-diyne

  • 서일권;박영태;김용록
    • Bulletin of the Korean Chemical Society
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    • v.20 no.6
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    • pp.677-682
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    • 1999
  • Conjugated polycarbosilanes with diacetylene and aromatic groups of thiophene or phenylene simultaneously present in the polymer backbone such as poly[[1,4-bis(thiophenyl)buta-1,3-diyne]-alt-(dimethylsilane)], poly[[1,4-bis(thiophenyl)buta-1,3-diyne]-alt-(diphenylsilane)], poly[[1,4-bis(phenyl)buta-1,3-diyne]-alt-(dimethylsilane)],and poly[[1,4-bis(phenyl)buta-1,3-diyne]-alt-(diphenylsilane)] have been prepared. The characteristic C=C stretching frequencies appear at 2177-2179㎝-1 in the IR spectra of the polymers. The molecular weights of these polymers were detemined by GPC. All of these materials are soluble in organic solvents such as THF and chloroform, and thermally stable up to 200℃ in general without any weight loss under nitrogen. The prepared materials in THF solvent show a maximum absorption peak in the range of 334-356 nm with a molar absorptivity of 10³∼10ⁿ(n=5)L/(cm·mol) in the UV-visible absorption spectra. A maximum emission peak in the range of 403-550 nm is also observed in the fluorescence emission spectra. Both absorption and emission spectra strongly indicate that the obtained polycarbosilanes contain the new conjugated systems along the polymer main chain.