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Kim, Young-eun,Im, Hyo Been,Jung, Un Ho,Park, Ji Chan,Youn, Min Hye,Jeong, Heon-Do,Lee, Dong-Wook,Rhim, Geun Bae,Chun, Dong Hyun,Lee, Ki Bong,Koo, Kee Young Elsevier 2019 Fuel Vol.256 No.-
<P><B>Abstract</B></P> <P>The linear α-olefin 1-octene was produced via the dehydration of 1-octanol over Al<SUB>2</SUB>O<SUB>3</SUB> catalysts. The effect of calcination temperature on the characteristics of an Al<SUB>2</SUB>O<SUB>3</SUB> catalyst and its activity in the dehydration of 1-octanol to 1-octene was investigated. Al<SUB>2</SUB>O<SUB>3</SUB> catalysts calcined at various temperatures (250, 500, 750, 1000 °C) were evaluated at 300–400 °C with a liquid hourly space velocity (LHSV) of 7–56 h<SUP>−1</SUP>. XRD, BET, <SUP>27</SUP>Al-NMR, Py-FTIR, and NH<SUB>3</SUB>-TPD analyses indicated that the calcination temperature affected the crystal phase, surface area, occupancy of the coordinated Al<SUP>3+</SUP> ion, and acidic properties of Al<SUB>2</SUB>O<SUB>3</SUB> catalysts. Upon calcination at temperatures >750 °C, the surface area of Al<SUB>2</SUB>O<SUB>3</SUB> catalysts reduced due to γ-Al<SUB>2</SUB>O<SUB>3</SUB> to θ-Al<SUB>2</SUB>O<SUB>3</SUB> phase transition. The changes in the crystal phase decreased the surface area, which correlated to the acidity of the Al<SUB>2</SUB>O<SUB>3</SUB> catalyst. The distribution of unsaturated Al<SUP>3+</SUP> ions acting as LAS on the catalyst surface increased with increasing calcination temperature, but decreased above 750 °C calcination temperature due to the diminishing surface area. The Al<SUB>2</SUB>O<SUB>3</SUB> catalyst calcined at 500 °C showed the highest 1-octanol conversion in the dehydration of 1-octanol. High 1-octene selectivity was maintained while the isomer ratio decreased at a high LHSV of 56 h<SUP>−1</SUP>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Linear α-olefin 1-octene produced via dehydration of 1-octanol over Al<SUB>2</SUB>O<SUB>3</SUB> catalyst. </LI> <LI> Changes in crystal phase affected the strong LAS and catalytic activity of Al<SUB>2</SUB>O<SUB>3</SUB>. </LI> <LI> Increased strong LAS improved 1-octanol conversion and 1-octene yield. </LI> <LI> Octene isomers decreased while DOE increased at higher LHSV. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Gene Profiling of Bone around Orthodontic Mini-Implants by RNA-Sequencing Analysis
Nahm, Kyung-Yen,Heo, Jung Sun,Lee, Jae-Hyung,Lee, Dong-Yeol,Chung, Kyu-Rhim,Ahn, Hyo-Won,Kim, Seong-Hun Hindawi Publishing Corporation 2015 BioMed research international Vol.2015 No.-
<P>This study aimed to evaluate the genes that were expressed in the healing bones around SLA-treated titanium orthodontic mini-implants in a beagle at early (1-week) and late (4-week) stages with RNA-sequencing (RNA-Seq). Samples from sites of surgical defects were used as controls. Total RNA was extracted from the tissue around the implants, and an RNA-Seq analysis was performed with Illumina TruSeq. In the 1-week group, genes in the gene ontology (GO) categories of cell growth and the extracellular matrix (ECM) were upregulated, while genes in the categories of the oxidation-reduction process, intermediate filaments, and structural molecule activity were downregulated. In the 4-week group, the genes upregulated included ECM binding, stem cell fate specification, and intramembranous ossification, while genes in the oxidation-reduction process category were downregulated. GO analysis revealed an upregulation of genes that were related to significant mechanisms, including those with roles in cell proliferation, the ECM, growth factors, and osteogenic-related pathways, which are associated with bone formation. From these results, implant-induced bone formation progressed considerably during the times examined in this study. The upregulation or downregulation of selected genes was confirmed with real-time reverse transcription polymerase chain reaction. The RNA-Seq strategy was useful for defining the biological responses to orthodontic mini-implants and identifying the specific genetic networks for targeted evaluations of successful peri-implant bone remodeling.</P>
THM 형성 영향인자에 의한 THM 농도예측 및 고도정수처리 공정에의 적용
김동윤,임정아,윤정효,박선호 대한상하수도학회 1997 상하수도학회지 Vol.11 No.4
Trihalomethanes (THMs) are formed during the chlorination of waters containing precusors compounds, most commonly humic substances, changes in pH, TOC, temperature, precusor source and concentration chlorine dosage, bromide level and reaction time directly influence trihalomethane formation potential (THMFP) and kinetics. A standard THMFP experiment was conducted for each water under the following conditions; 20℃, pH 7.4, reaction time of 48hr, TOC 5.7mgC/L. A series of kinetic experiments was conducted for each water to provide THM formation under varying conducted for each water to provide THM formation under varying conditions of reaction time, pH, temperature and TOC, chlorine dosage. The resultant multiple parameter powre function predicts a THM which allows direct calculation of THM, is [THM] = 0.00039(pH-2.81)[TOC][Cl_2]^0.321 t^0.266 T^0.286 Characteristics of raw water in advanced drinking water treatment pilot plant were, TOC levels ranged from 4.42~6.84mgC/L, pH 7.2~7.8, temperature 7.0~18.4℃, UV-254 absorbance 0.057~0.85cm^-1, THM levels ranged from 0.031~0.049mgC/L.
정수처리공정시 Ozone Mass Transfer 및 적용에 관한 연구
김동윤,윤정효,임정아,유정아 부산대학교 환경문제연구소 1996 環境硏究報 Vol.14 No.1
The mass transfer was known that a residual ozone was changed to proportion by the ozone dosages. The mass transfer coefficients of ozone calculated for slope of relationships ozone dosage versus residual ozone concentrations. The relationship of ozone utility rate versus slope of its was known to unproportions. A residual ozone could control by the ozone dosages about water qualities and could inlet to ozone of optimum in the reactors. The relationship of organics and reactions of ozone changed by the condition of water qualifies and estimations of organics in a drinking water at the water work systems would be BDOC. The equation of relationships ozone dosages versus increasing BDOC is following: BDOC = BDOC_o + 0.105Cd^0.52
Kim, Sun Kwang,Moon, Hak Jin,Na, Hyo Suk,Kim, Kye Jin,Kim, Ji Hoon,Park, Jung Hyuk,Lee, Sang Hoon,Rhim, Sung Soo,Lee, Soon-Geul,Min, Byung-Il The Physiological Society of Japan 2006 JOURNAL OF PHYSIOLOGICAL SCIENCES Vol.56 No.3
<P>The technique of rotating acupuncture needles has long been used to enhance the effects of acupuncture in Oriental medicine. However, it is difficult to standardize and quantify this stimulation condition. Thus we developed an automatically controlled rotating acupuncture (ACRA) system. The present study was conducted to evaluate the analgesic effects of ACRA using 4 different stimulation conditions (i.e., angle and frequency of rotation: 90° + 1 Hz, 90° + 1/4 Hz, 360° + 1 Hz, and 360° + 1/4 Hz) in Sprague-Dawley rats. Tail-flick latency to a noxious radiant heat stimulus in lightly anesthetized rats was measured before and after 15 min of ACRA stimulation at the Zusanli (ST36) acupoint. ACRA stimulations under all of the conditions above produced more potent analgesic effects than plain acupuncture (PA, acupuncture needle insertion only), but only the 90° + 1/4 Hz ACRA condition showed a statistically significant effect versus PA (<I>P</I> < 0.01). Further, the analgesic effect of 90° + 1/4 Hz ACRA was reversed by pretreatment with naloxone (2 mg/kg, i.p.). These results indicate that the 90° + 1/4 Hz ACRA stimulation has the most potent analgesic effect in rats and that this is mediated by the endogenous opioid system.</P>