• Title, Summary, Keyword: chemical property

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Prediction of Sensory Property form Leaf Chemical Property in Flue-cured Tobacco (황색종 잎담배의 화학성분에 의한 관능 특성 예측)

  • Jeong, Kee-Taeg;Bock, Jin-Young;Kim, Si-Mong;Lee, Chul-Hee;Lee, Joung-Ryoul
    • Journal of the Korean Society of Tobacco Science
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    • v.29 no.2
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    • pp.74-79
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    • 2007
  • This study was conducted to evaluate the prediction of sensory property of smoke from leaf chemical property and characterize leaf chemical components for the best tobacco taste's leaves in flue-cured tobacco. For analytical and sensory evaluations, one hundred and forty grades were used. The major leaf chemical components to predict the sensory property of smoke were nicotine for impact, irritation and off taste & odor, and total sugar/nicotine ratio for tobacco taste. Within ${\pm}20%$ range of difference, the predictable probabilities of sensory property of smoke form leaf chemical property were 80.0% for off taste & odor and $91.4{\sim}96.4%$ for impact, irritation and tobacco taste. As a result of K-means cluster analysis on the basis of tobacco taste, the desirable leaf chemical component contents were $2.77{\sim}3.55%$ in nicotine and $5.1{\sim}6.9$ in total sugar/nicotine ratio. This study suggest that the some regression equations may be useful to predict the sensory property of tobacco smoke from a few selected leaf chemical components in flue-cured tobacco and to select the flue-cured tobacco leaves for enhance the tobacco taste of cigarette.

Prediction of Sensory Property from Leaf Chemical Property in Burely Tobacco (버어리종 잎담배의 화학성분에 의한 관능 특성 예측)

  • Jeong, Kee-Taeg;Cho, Soo-Heon;Bock, Jin-Young;Park, Seong-Weon;Lee, Joung-Ryoul
    • Journal of the Korean Society of Tobacco Science
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    • v.29 no.2
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    • pp.80-84
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    • 2007
  • This study was conducted to evaluate the prediction of sensory property of smoke from the leaf chemical property and characterize leaf chemical components for the best tobacco taste's leaves in burley tobacco. For analytical and sensory evaluations, sixteen grades were used. The major leaf chemical components to predict the sensory property of smoke were ether extract for tobacco-like, chloride for impact and total nitrogen/nicotine for irritation. Within ${\pm}20\;%$ range of difference, the predictable probabilities of sensory property of smoke from the leaf chemical properties were 100 % for tobacco-like, impact and irritation. As a result of K-means cluster analysis on the basis of tobacco taste, the desirable leaf chemical component contents were $6.5{\sim}6.8\;%$ in ether extract, $0.25{\sim}0.30\;%$ in chloride and $1.26{\sim}1.54$ in total nitrogen/nicotine ratio. This study suggest that the some regression equations may be useful to predict the sensory components of tobacco smoke from a few selected leaf chemical properties in burley tobacco and to select the burley tobacco leaves for enhance the tobacco taste of cigarette.

Comparative study on structural and luminescence properties of solution processed ZnO thin films

  • Park, Byung-Yoon;Choi, Sung-Ho;Hong, Chang-Seop;Ryu, Beyong-Hwan;Jung, Ha-Kyun
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1433-1436
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    • 2009
  • Film morphology, crystallinity, and luminescence property of solution processed ZnO films have been studied. Fluorine addition and annealing ambient significantly change the defect-related emission band as well as the structural property. Using the overall emission behaviors, we can predict an optimized process condition for solution-based ZnO thin film.

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Effect of Chemical Composition on the Microstructure and Tensile Property in TRIP-assisted Multiphase Steels (TRIP형 복합조직강의 미세조직 및 인장성질에 미치는 화학조성의 영향)

  • Lee, K.Y.;Jang, W.Y.;Kang, J.W.
    • Journal of the Korean Society for Heat Treatment
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    • v.16 no.3
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    • pp.127-133
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    • 2003
  • The effect of chemical composition on the microstructural change and tensile property in TRIP-assisted steels with different chemical composition was investigated by using SEM, TEM, XRD and UTM. As a result of microscopic observation, the morphology of retained austenite could be identified as two types; a granular type in a steel containing higher Si and a film type in a steel having higher C. For the case of higher C-containing steel with a tensile strength of 860 MPa and a total elongation of 38%, film-typed retained austenite could be observed between lath bainitic ferrite. Actually, metastable retained austenite was a requisite for the good formability, which means that chemical composition plays a significant role in the microstructure and tensile property of TRIP-assisted steels. With respect to tensile property, the steels containing suitable Si and Mn, respectively, showed a typical TRIP effect in stress-strain curve, while a steel containing higher Mn content exhibited the similar behavior shown in dual phase steel.

Effect of Chemical Composition on Tensile Property in TRIP-assisted Multiphase Steel for Automobile Structure (차량구조용 변태유기소성(TRIP)형 복합조직강의 인장성질에 미치는 화학조성의 영향)

  • Lee, Ki-Yeol;Bang, Il-Hwan;Ma, Ah-Ram;Kim, Young-Sun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.3
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    • pp.106-113
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    • 2007
  • The effect of chemical composition on the microstructural change and tensile property in TRIP-assisted steels with different chemical composition was investigated by using SEM, TEM, XRD and UTM. As a result of microscopic observation, the morphology of retained austenite could be identified as two types : a granular type in a steel containing higher sillicon and a film type in a steel having higher carbon. For the case of higher carbon-containing steel with a tensile strength of 860 MPa and a total elongation of 38%, film-typed retained austenite could be observed between lath bainitic ferrite. Actually, metastable retained austenite was a requisite for the good formability, which means that chemical composition plays a significant role in the microstructure and tensile property of TRIP-assisted steels. With respect to tensile property, the steels containing suitable silicon and manganese, respectively, showed a typical TRIP effect in stress-strain curve, while a steel containing higher manganese content exhibited the assimilar behavior shown in dual phase steel.

Preparation of Durable Softeners for Nylon Fiber Using Fatty Polyamide and Alkyl Imidazoline (지방산 폴리아미드 및 알킬이미다졸린을 이용한 나일론 섬유용 내구성 유연제의 제조)

  • Jung, Choong-Ho;Kim, Sung-Rae;Park, Hyong-Jin;Hahm, Hyun-Sik;Kim, Tae-Ok;Park, Hong-Soo
    • Journal of the Korean Applied Science and Technology
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    • v.19 no.4
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    • pp.291-296
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    • 2002
  • Fatty polyamide that gives softness, lubrication and bulky property and alkyl imidazoline that gives durable softness and antistatic property were synthesized. then, an O/W-type durable softener (DSN) was prepared by the emulsion of the synthesized fatty polyamide and alkyl imidazoline. Emulsion stability of the DSN was good, and the mixed HLB value was 11.2. From the measurement of softness, lubrication, antistatic property, bending resistance, and color fastness, it was proved that the prepared DSN was a good durable softener for nylon.

A modified scaled variable reduced coordinate (SVRC)-quantitative structure property relationship (QSPR) model for predicting liquid viscosity of pure organic compounds

  • Lee, Seongmin;Park, Kiho;Kwon, Yunkyung;Park, Tae-Yun;Yang, Dae Ryook
    • The Korean Journal of Chemical Engineering
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    • v.34 no.10
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    • pp.2715-2724
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    • 2017
  • Liquid viscosity is an important physical property utilized in engineering designs for transportation and processing of fluids. However, the measurement of liquid viscosity is not always easy when the materials have toxicity and instability. In this study, a modified scaled variable reduced coordinate (SVRC)-quantitative structure property relationship (QSPR) model is suggested and analyzed in terms of its performance of prediction for liquid viscosity compared to the conventional SVRC-QSPR model and the other methods. The modification was conducted by changing the initial point from triple point to ambient temperature (293 K), and assuming that the liquid viscosity at critical temperature is 0 cP. The results reveal that the prediction performance of the modified SVRC-QSPR model is comparable to the other methods as showing 7.90% of mean absolute percentage error (MAPE) and 0.9838 of $R^2$. In terms of both the number of components and the performance of prediction, the modified SVRC-QSPR model is superior to the conventional SVRC-QSPR model. Also, the applicability of the model is improved since the condition of the end points of the modified model is not so restrictive as the conventional SVRC-QSPR model.

Synthesis and Surface Characteristics of Novel Oligomeric Silane with Perfluoropolyether (과불소 폴리에테르 포함 새로운 실란형 올리고머의 합성과 표면 특성)

  • Park, Eun-Young;Lee, Sang-Goo;Ha, Jong-Wook;Park, In-Jun;Lee, Soo-Bok;Lee, Yong-Taek
    • Polymer Korea
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    • v.32 no.4
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    • pp.397-402
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    • 2008
  • Perfluoropolyether(PFPE) has been widely applied in industry because of its very excellent properties of very high contact angle and low surface energy, good lubricant property and antifouling property. But the difficulty to synthesize PFPE has limited the research on this field. In this study, the novel silicon-containing oligomer with perfluoropolyether moiety was synthesized, and the structure was characterized by $^{19}F$-NMR and $^1H$-NMR. The surface properties of contact angle, sliding angle, and soil release property were investigated. The results show that PFPE in this study can be utilized as an anti-smudge coating material because it shows lower sliding angle and better soil release property than commercial products.