• Title/Summary/Keyword: Technical Effect

Search Result 2,820, Processing Time 0.025 seconds

The effect of sweep angle on the limit cycle oscillations of aircraft wings

  • Eken, Seher;Kaya, Metin Orhan
    • Advances in aircraft and spacecraft science
    • /
    • v.2 no.2
    • /
    • pp.199-215
    • /
    • 2015
  • This study focuses on the limit cycle oscillations (LCOs) of cantilever swept-back wings containing a cubic nonlinearity in an incompressible flow. The governing aeroelastic equations of two degrees-of-freedom swept wings are derived through applying the strip theory and unsteady aerodynamics. In order to apply strip theory, mode shapes of the cantilever beam are used. The harmonic balance method is used to calculate the frequencies of LCOs. Linear flutter analysis is conducted for several values of sweep angles to obtain the flutter boundaries.

Recycling of Wastepaper(III)-Improvement of Strength and Optical Properties of Testliner by Successive Treatments of Flotation and Kneading- (고지재생연구(제3보)-부상부유 및 니딩처리에 의한 라이너지의 강도 및 광학적 성질 개선-)

  • 서형일;류정용;신종호;송봉근;오세균
    • Journal of Korea Technical Association of The Pulp and Paper Industry
    • /
    • v.31 no.1
    • /
    • pp.17-22
    • /
    • 1999
  • KOCC pulp was fractionated by air froth flotation and the resultant accept was further treated with kneading. The study on the effect of this combination process revealed that the flotation and the successive kneading were found to be effective in improving strength and drainage properties as well optical cleanliness of testliner based on 100% KOCC.

  • PDF

Development of a FTIR Spectroscopy for the Determination of Paper Strength

  • Hoang Viet;Nguyen Kien Loi
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
    • /
    • 2006.06a
    • /
    • pp.177-180
    • /
    • 2006
  • Inter-fiber bonding is improved by refining resulting in higher Young's modulus. This effect is consistent to the changes of FTIR absorption intensities associated with the hydroxyl groups in the pulp samples. A PLS model, which is established to correlate the FTIR spectral data with the Young's modulus of the pulp samples for predicting the elastic Young's modulus of paper, is statistically robust.

  • PDF

Manufacture of Antimicrobial Paper for Food Products (식품포장용 항균지 제조)

  • 이명구;이상명;오덕환
    • Journal of Korea Technical Association of The Pulp and Paper Industry
    • /
    • v.32 no.1
    • /
    • pp.65-71
    • /
    • 2000
  • Chitosan oligosaccharide, chitosan polysaccharide and monolaurin were used to impart the antimicrobial properties onto paper for food products . Staphylococcus aureus (ATCC 25923) was used as test microorganism and shake flask test was carried out in order to examine the antimicrobial activity of each sample. Chitosan oligosaccaride showed the greatest antimicrobial effect among them and gave the promising result even at the concentration of 0.005%. Its antimicrobial power was enhanced when it is used with nomolaurin together. Chitosan oligosaccharide improved the tensile strength of antimicrobial paper.

  • PDF

The Research State for Offset Effect of Flame Retardant (방염제의 상쇄효과(相殺效果)의 연구현황)

  • A Flame Retardant Technical Study Meeting of Yeungnam University
    • Textile Coloration and Finishing
    • /
    • v.8 no.5
    • /
    • pp.90-93
    • /
    • 1996
  • 섬유공업에서 방염가공의 필요성은 여기서 제언할 필요조차 없고, 방염제와 타종가공약제간의 상승효과에 관한 연구논문은 많으나, 방염제의 상쇄효과에 관한 연구논문은 드물다. 여기에서 소개코저하는 내용은 보기드문 연구내용으로서 현업에 종사하시는 우리 회원들에게는 많은 도움이 되리라 생각하여 소개한다.

  • PDF