• Title, Summary, Keyword: far-infrared ray

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Fabrication of Ceramic Particles Deposited Nano-web using Electrospinning Process and Its Far-infrared Ray Emission Property (원적외선 방출 특성을 갖는 나노 웹의 제조 및 원적외선 방사 특성에 관한 연구)

  • Hong, So-Ya;Lee, Chang-Hwan;Kim, Joo-Yong
    • Textile Coloration and Finishing
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    • v.22 no.2
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    • pp.118-122
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    • 2010
  • The interest in textile which has far-infrared ray emissive property has been increased in the field of biophysics and medicine. In this study, far-infrared ray emissive polyurethane nano-web was obtained using electrospinning of polyurethane(PU) solution mixed with ceramics powder and far-infrared ray emissive properties of nano-web were evaluated by measuring far-infrared ray emission power and emissivity(%). To investigate the influence of concentration of ceramics powder in PU solution and temperature for far-infrared ray emissive properties, far-infrared ray emissivity was measured at varied temperature using various nano-web including varied concentration of ceramics powder. Polyurethane nano-web was characterized by SEM to observe the deposition of ceramics powder on polyurethane nano-web surface. The far-infrared ray emissivity was increased with the concentration of ceramics powder in the nano-web. The far-infrared ray emission power was enhanced with increasing temperature of the samples; however, far-infrared ray emissivity was decreased with increasing temperature because the increase of emission power of ceramic containing nano-web was lower than the emission power of black body one.

Thermo Physiological responses of Far Infrared Ray Radiation Fabrics at outdoor in summer (옥외에서 원적외선 방사직물 착용시 온열생리반응)

  • 송명견;안필자;최정화
    • Korean Journal of Rural Living Science
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    • v.7 no.2
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    • pp.121-128
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    • 1996
  • This study was performed to define the effects of Far Infrared Ray Radiation Fabrics as summer garments during outdoor work by human trial. One healthy male subject was volunteered for this study. Experimental garments consisted of three kinds of trousers (Cotton, Cotton/linen blended, Far Infrared Ray Radiation Fabric/wool blended) and basic garments (panty, socks, shirts, and dress shirts). The measurements were rectal temp., skin temp., microclimate inside clothing, heart rate, subjective sensation etc. The results were as follows : 1. Rectal temperature showed the lowest in Far Infrared Ray Radiation Fabrics among 3 garments. 2. Skin temperature (forehead, chest abdomen temp.) and mean skin temperature were lower in Far Infrared Ray Radiation Fabrics than in others, especially during early stage of work. 3. Heart rate showed lower value in Far Infrared Ray Radiation Fabrics than in others but there was no significance among the garments. 4. Humidity inside clothing and total weight loss showed the highest value in Far Infrared Ray Radiation Fabrics.

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A Study on Human Autonomic Nervous System Activities by Far-Infrared Ray Hyperthermia (원적외선 온열이 인체 자율신경기능에 미치는 영향에 관한 연구)

  • Park Chan-Ouk;Jang Yun-Ho;Min Se-Dong;Kang Se-Gu;Lee Chung-Keun;Lee Myoungho
    • Journal of Biomedical Engineering Research
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    • v.25 no.6
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    • pp.623-628
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    • 2004
  • This paper describes autonomic nervous system activities caused by hyperthermia of far-infrared ray on human body. Designed protocol and analysis algorithm were evaluated by experiments on 20 subjects to analyze the characteristic of heart rate variability(HRV) signals which could be analyzed by FFT power spectrum and time-frequency analysis. Using Poincare' plot analysis, LF and HF were compared with SD1 and SD2. During the experiment, subject was exposed to hyperthermic effects of far-infrared radiation. We could confirm that far-infrared ray, which was known to improve the blood circulation, stress state and enhancing thermal effect into human body, had an effect on human nervous system. As the hyperthermic temperature of far-infrared ray increased, the activity of cardiovascular system to sustain the homeostasis was observed by means of investigating the increase of the sympathetic activity.

Quality Enhancement of Vaccum Packaged Waxy Corns by Far Infrared Ray Drying (원적외선 건조처리에 의한 진공포장 찰옥수수의 품질확보)

  • Choi, Jae-Ho;Im, Ji-Soon;Oh, Deog-Hwan
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.35 no.5
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    • pp.635-640
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    • 2006
  • This study was conducted to determine the effect of far infrared ray drying on the microbial and quality changes of vacuum packaged waxy corns, such as microbial growth, rehydration, color differences, weight loss and hardness during the storage at $4^{\circ}C$ and $25^{\circ}C$ for 7 months. After far infrared ray drying for 6 hours at $60^{\circ}C$, 2.32 log CFU/g of total microbial counts in raw waxy corns was enumerated, but no microorganism was detected in steamed or sugar-treated waxy corns. However, no microorganism was observed in all treatments except for control samples until 3 month storage at $4^{\circ}C$, whereas steamed and sugar-treated waxy corns showed 2 and 2.7 log reduction compared to that of control after 3 month storage. Yeasts and molds were more resistant than bacteria against far infrared ray drying at the same conditions. Similar results were observed in $25^{\circ}C$ storage. The degree of gelatinization in raw waxy corns far infrared ray drying changed from 98% to 96.2% after 7 month storage at $4^{\circ}C$, whereas steamed waxy corns with far infrared ray drying changed from 81.14% to 58.73%. Water contents in sugar-treated waxy corns with far infrared ray drying gradually reduced compared to steamed waxy corns as drying time increased. The L values in raw waxy corns far infrared ray drying increased as drying time increased, but L values in steamed or sugar-treated waxy corns significantly reduced after 12 hour far infrared ray drying. Hardness in raw waxy corns was higher than in steamed or sugar-treated waxy corns before storage, but similar hardness was observed between raw- and sugar-treated waxy corns after 9 hour drying. This results showed that the microbial reduction, the enhancement of shelf life and quality establishment of steamed or sugar-treated waxy corns could be maximized by using far infrared ray drying.

Far-Infrared Ray Drying Characteristics of Rough Rice (I) -Thin layer drying equation- (벼의 원적외선 건조특성 (I) -박층건조방정식-)

  • Keum, D. H.;Kim, H.;Hong, S. J.
    • Journal of Biosystems Engineering
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    • v.27 no.1
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    • pp.45-50
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    • 2002
  • This study was performed to develop thin layer drying equations fur short grain rough rice using far-infrared ray. Thin layer drying tests was conducted at four far-infrared ray temperature levels of 30, 40, 50, 60$^{\circ}C$ and two initial moisture content levels of 20.7, 26.2%(w.b.). The measured moisture ratios were fitted to Lewis and Page drying models by stepwise multiple regression analysis. Half response time of drying was affected by both drying temperature and initial moisture content at drying temperature of below 40$^{\circ}C$, but at above 40$^{\circ}C$ was mainly affected by drying temperature. Experimental constant(k) in Lewis model was a function of drying temperature, but K and N in Page model were function of drying temperature and initial moisture content. Moisture ratios predicted by two drying models agreed well with experimental values. But in the actual range of drying temperature above 30$^{\circ}C$ Page model was more suitable for predicting of drying rates.

Electrical Properties and Far-infrared Ray Emission of Ceramics Manufactured with Sawdust and Rice Husk (톱밥과 왕겨로 제조된 세라믹의 전기적 성질과 원적외선 방사특성)

  • Oh, Seung Won
    • Journal of the Korean Wood Science and Technology
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    • v.44 no.1
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    • pp.106-112
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    • 2016
  • This study investigated electrical properties and far-infrared ray emission according to the carbonizing temperature and phenol-formaldehyde (PF) resin impregnation ratio of ceramics manufactured using sawdust and rice husk. The far-infrared ray emission values and emission energy values decreased as the carbonizing temperature increased. The far-infrared ray emission values of the ceramics manufactured using a carbonizing process at $600^{\circ}C$ and a board with a PF resin impregnation ratio of 60 percent was 0.930; the emission energy presented the highest value of $4.32{\times}10w/m^2$. The electric resistance decreased as the carbonizing temperature increased. For the increase in the carbonizing temperature above $1200^{\circ}C$, ceramics was very close to a conductor due to the small resistance. The power consumption increased by the decrease of electric resistance and increase of the electric current in the case of a higher resin impregnation ratio.

Optimization of sintering process of the far-infrared radiation ceramic (원적외선 방사 세라믹의 소결공정 최적화)

  • Park, Jae Hwa;Kim, Hyun Mi;Kang, Hyo Sang;Choi, Jae Sang;Choi, Bong Geun;Nam, Ki Woong;Nam, Han Woo;Shim, Kwang Bo
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.26 no.1
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    • pp.28-34
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    • 2016
  • Far-infrared radiation ceramic is an attractive material that provides thermal therapy by permeating the infrared rays into the deep inside of the human skin. Therefore, it is currently used for thermal therapy devices, thermal mat, heating equipment and so on. This work aims to optimize the sintering process of the far-infrared radiation ceramic with the process parameters of temperature and time. A variety of characterization tools have been used to investigate the optimal sintering condition of far-infrared radiation. The phase of far-infrared radiation ceramic was characterized by using X-ray diffraction (XRD) and microstructure of fracture surface was studied by scanning electron microscopy (SEM). The FT-IR was also performed to measure the far-infrared emissivity.

The Study of Characteristic of Electromagnetic wave and Heat of Far Infrared Ray Radiant Oven (원적외선 복사오븐의 전자파 및 열적 특성연구)

  • Kim, Yong-Ha;Back, Bum-Min;Woo, Sung-Min;Jung, Hyun-Sung;You, Jung-Hee;Park, Hwa-Young;Park, Jung-Min
    • Proceedings of the KIEE Conference
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    • pp.2053_2054
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    • 2009
  • This paper studied about the characteristics of the Far Infrared Ray Radiant Oven. We decrease intensity of electromagnetic wave which depended on electric and magnetic field occured by the Far Infrared Ray Radiant Oven and then the affected effect on the human body is minimized.

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Far Infrared Radiation Characteristics of Germanium Compounds (게르마늄 화합물의 원적외선 방사특성)

  • Lee, Hyun-Kyung;Lee, Kyung-Mee
    • Applied Chemistry for Engineering
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    • v.17 no.6
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    • pp.597-603
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    • 2006
  • In order to study the effects of $GeO_{2}$ contents in $XSiO_{2}{\cdot}YGeO_{2}$ and $XSiO_{2}{\cdot}YNa_{2}O{\cdot}ZGeO_{2}$ compounds on far infrared ray radiation, we investigated the sample of $XSiO_{2}{\cdot}YGeO_{2}$ and $XSiO_{2}{\cdot}YNa_{2}O{\cdot}ZGeO_{2}$ using TG-DTA, XRD, FT-IR spectrophotometer and FT-IR spectrometer. The far infrared ray emissivity and emission power were increased with the increase of $GeO_{2}$ contents in $XSiO_{2}{\cdot}YGeO_{2}$ and $XSiO_{2}{\cdot}YNa_{2}O{\cdot}ZGeO_{2}$ compounds. The far infrared ray emissivity and emission power of $XSiO_2{\cdot}YGeO_2$ compounds were higher than those of $XSiO_{2}{\cdot}YNa_{2}O{\cdot}ZGeO_{2}$ compounds.

Infrared Supernova Remnants and Their Infrared to X-ray Flux Ratios

  • Koo, Bon-Chul;Lee, Jae-Joon;Seok, Ji-Yeon;Jeong, Il-Gyo;Kim, Hyun-Jeong
    • The Bulletin of The Korean Astronomical Society
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    • v.40 no.2
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    • pp.34.3-35
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    • 2015
  • Recent high-resolution infrared space missions have revealed supernova remnants (SNRs) of diverse morphology in far infrared (FIR), often very different from their X-ray appearance. This suggests that the FIR emission from SNRs could be of different origins. For a sample of 20 Galactic SNRs, we examine the correlation between their FIR and X-ray properties and explore the origin of the FIR emission. We find that the SNRs with very different FIR and X-ray morphology have relatively large infrared-to-X-ray (IRX) flux ratios. We argue that the FIR emission in these SNRs is likely mainly from dust grains radiatively-heated by shock radiation. For SNRs with similar IR and X-ray morphology, the FIR emission of which is probably mostly from dust grains collisionally heated by hot plasma, we compare their IRX flux ratios with theoretical ratios from a model incorporating time-dependent dust destruction and non-equilibrium ionization cooling behind SNR shock, and discuss the implications of our result.

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