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중탄 복합체를 이용한 고충전 인쇄용지 제조(1) - 중탄 복합체의 입자 특성 및 와이어 마모도 -
최철규,유성종,이용규,원종명 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.4
In the advent of severe global warming and climate change, the demand for reduced energy consumption and carbon dioxide emissions pertaining to the paper industry is increasing. In order to solve this problem, an attempt was made to produce a GCC-MFC composite having the possibility of increasing the amount of filler used without causing a decrease in paper properties and productivity. In particular, this study focused on the change in wire abrasiveness and the possibility of particle size control, which are basic problems associated with increasing filler particle size. The average particle size and wire abrasiveness of GCC used in this study were about 1–2 μm and 160–195 mg respectively. However, the average particle size and wire abrasiveness of the prepared GCC-MFC composite were 10.26–18.32 μm and 113–116 mg, respectively. In addition, it was confirmed that the average particle size of the GCC-MFC composite can be controlled by monitoring the amount of MFC and polymer flocculants. The study also observed that good formation paper can be obtained by dispersing the prepared GCC-MFC composite at 3,000 rpm. It is expected that the production of GCC-MFC composite may contribute in the improvement of productivity while reducing energy consumption by increasing the amount of filler use, thus solving the problem of decrease in paper strength.
崔哲圭,金成九 충남대학교 기초과학연구소 1981 연구논문집 Vol.2 No.-
Laser is a system far away thermal equilibrium. But it has been suggested that the statistical properties of the laser light at threshold have close analogy to the thermodynamic phase transition of equilibrium system. We study the nonequilibrium phase transition of laser light by utilizing the analogy. The Ginzburg-Landau model for the second-order phase transition in ferromagnetic system is introduced and solved by Gaussian approximtion. The order parameter for the laser light is the amplitude of the electric field and the atomic population inversion is a quantity corresponding to the thermodynamic temperature. The quantities associated with the critical indices are discussed together with the fluctuations in the threshold region. The laser light above threshold show a high degree of coherence. The cooperative effects and self-organization producing such a coherent state are discussed in terms of statistical entropy. The description using the entropy is carried out by applying the results of the stochastic theory used for the nonlinear chemical reaction.