http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Temporal Measurement of Size and Concentration of Soot Aggregates in Diesel Exhaust
Takeyuki Kamimoto,Toshiaki Nakajima,Myung-whan Bae 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
An optical method to measure the size and number density of soot aggregates in the diesel exhaust has been proposed. Two laser beams in co-axial alignment transmit a soot loaded exhaust gas flow, and the transmittance at each wavelength is detected simultaneously. Volume equivalent diameter and number density of soot aggregates in the optical path can be theoretically given by the transmittance values measured at two wavelengths. A test conducted using a single cylinder DI diesel engine showed that the proposed method is able to measure the temporal variations of the size and number density of soot aggregates in the diesel exhaust at a transient mode operation.<br/> <br/>
Development of Synthetic Magnetic Zeolite Adsorbents and Application to Ammonium Ion Removal
Yuki Kamimoto,Takeshi Hagio,정용준,Ryoichi Ichino,길경익 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.5
Synthetic magnetic zeolite with Fe3O4 was developed and its adsorption performance of ammonium ions was examined. The influence of pH levels, Fe3O4 content of the magnetic zeolite, magnetization curve of the magnetic zeolite and isotherm curve were examined in batch type experiments. Magnetic zeolite synthesized by a hydrothermal process was observed with less than 12.6 wt% of Fe3O4 content by scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis. With the optimum pH level around 8, qe decreases linearly with the increase of Fe3O4 content. Additionally, the adsorption isotherm ofammonium ions is approximated by a Langmuir equation when the maximum adsorption was obtained at about 1.60 mmolg−1. Such processes as the substitution and thermal desorption methods were successfully introduced to regenerate the magnetic zeolite saturated by ammonium ions, which is shown to be easily separated by magnetic force. Thus, the magnetic zeolite is a potential adsorbent for the removal of ammonium ions with an easy separation method using a magnetic process.
Global Trends in Internal Combustion Engines
Takeyuki, Kamimoto 경상대학교 공과대학 항공기계공학부 1999 WORKSHOP 자료집 Vol.1999 No.1
Global wanning, energy saving and local pollution issues demand more advanced propulsion systems for automobiles for the future. These demands are accelerating the development of new systems such as fuel-cell and hybrid vehicles. This article describes first the state-of-art of these new technologies and relevant factors such as fuel cost and customers needs, and then introduces several estimates on the time schedule of possible introduction of these technologies. The performances of the conventional piston engines are being significantly improved recently so as to be competent to these new systems. The current trends in internal combustion engines are also explained in the latter half of the article.
디젤기관 배기 배출물 중의 매연 입자경 및 농도의 실시간 계측
배명환,Takevuki Kamimoto,김정민 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Soot emissions from automobiles, in particular diesel vehicles, arc severely regulated owing to their contributions to air pollution. The particulate maner less than 10μm, referred to as PM 10, has been linked 10 various health issues. Recently, the size and number density of particulate matter(PM) has emerged as influential parameters of particulate toxicity. In this study, an optical method to measure the size and number density of soot aggregates in the diesel exhaust has been proposed. Two laser beams in co-axial alignment transmit a soot loaded exhaust gas 리ow, and the transmittance at each wavelength is detected simultaneously. The volume equivalent diameter and number density of soot aggregates in the optical path can be theoretically given by the transmittance values measured at two wavelengths. A test con-ducted by a single cylinder DI diesel engine shows that the temporal variations of the size and number density of soot aggregates in the diesel exhaust can be measured by the proposed method at a transient mode operation.
Arsenic removal properties by electrolyzed and calcined manganese dioxide
Yong-Jun Jung,Yuki Kamimoto 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.5
As(V) removal properties of manganese dioxides which are commonly used for the removal of manganese in water treatment processes were evaluated in this paper. The following manganese dioxides were used: two types of powdered manganese dioxides powdered or electrolyzed MnO₂ (g-structure) and calcined MnO₂ (b-structure), and a granular MnO₂, which was prepared by coating MnO₂ onto a ceramic particle. The maximum arsenate adsorption capacity of the electrolyzed and calcined MnO₂ was 2.22 and 2.26 ㎎-As g<SUP>-1</SUP>, respectively. The adsorption capacity of the granular MnO₂ was 0.543 ㎎-As g<SUP>-1</SUP> and this value corresponded to the MnO₂ content (23.2%) of the granular adsorbent. When an arsenate solution of 0.1 ㎎-As L<SUP>-1</SUP> was fed into the column (10 ㎜ i.d.; 100 ㎜ long) packed with the granular MnO₂ at SV = 20 h<SUP>-1</SUP>, the column received 28.9 L of the feed solution (3,580 times the bed volume) before the breakthrough point (0.01 ㎎-As L<SUP>-1</SUP>). The adsorption isotherms for the electrolyzed and granular MnO₂ were approximated by the modified Langmuir equations. On the other hand, the adsorption isotherm for the calcined MnO₂ was approximated by the Freundlich equation. Based on the adsorption isotherms, the As(V) adsorption amounts at 0.01 ㎎-As L<SUP>-1</SUP> of the equilibrium concentration were evaluated as follows: 1.27 ㎎-As g<SUP>-1</SUP> for the electrolyzed MnO₂, 1.20 ㎎-As g<SUP>-1</SUP> for the calcined one, and 0.29 ㎎-As g<SUP>-1</SUP> for the granular one. Since granular MnO₂ has been commonly used for the removal of manganese from water treatment systems, the process can be also applied to arsenate removal.