• Animal Bioscience
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• 제37권6호
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• pp.1077-1084
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• 2024

Objective: The present work was conducted to evaluate suitable variables and develop prediction equations using chemical composition and physical characteristics for estimating standardized ileal digestibility (SID) of lysine (Lys) in full-fat soybeans (FFSB). Methods: The chemical composition and physical characteristics were determined including trypsin inhibitor activity (TIA), urease activity (UA), protein solubility in 0.2% potassium hydroxide (KOH), protein dispersibility index (PDI), lysine to crude protein ratio (Lys:CP), reactive Lys:CP ratio, neutral detergent fiber, neutral detergent insoluble nitrogen (NDIN), acid detergent insoluble nitrogen (ADIN), acid detergent fiber, L* (lightness), and a* (redness). Pearson's correlation (r) was computed, and the relationship between variables was determined by linear or quadratic regression. Stepwise multiple regression was performed to develop prediction equations for SID of Lys. Results: Negative correlations (p<0.01) between SID of Lys and protein quality indicators were observed for TIA (r = -0.80), PDI (r = -0.80), and UA (r = -0.76). The SID of Lys also showed a quadratic response (p<0.01) to UA, NDIN, TIA, L*, KOH, a* and Lys:CP. The best-fit model for predicting SID of Lys in FFSB included TIA, UA, NDIN, and ADIN, resulting in the highest coefficient of determination (R² = 0.94). Conclusion: Quadratic regression with one variable indicated the high accuracy for UA, NDIN, TIA, and PDI. The multiple linear regression including TIA, UA, NDIN, and ADIN is an alternative model used to predict SID of Lys in FFSB to improve the accuracy. Therefore, multiple indicators are warranted to assess either insufficient or excessive heat treatment accurately, which can be employed by the feed industry as measures for quality control purposes to predict SID of Lys in FFSB.

• 대한환경공학회지
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• 제22권5호
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• pp.819-825
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• 2000

본 연구는 자동차 폐촉매의 재활용 가능성을 검토하기 위하여 촉매의 물리화학적 특성 및 acetaldehyde의 연소활성에 관하여 조사하였다. 자동차 폐촉매의 물리화학적 특성을 조사하기 위하여 EA(Elemental analysis), ICP-AES (Inductively coupled plasma-atomic emission spectrophotometer), XRD(X-ray diffraction) 분석을 수행하였다. Carbon 침적량은 촉매의 전반부가 후반부보다 많았으며, 주행거리에 따라 증가하는 경향을 보였다. Pt, Pd, Rh 함유량은 제작사에 따라 구성성분의 차이를 보였다. 모델 VOC로서 acetaldehyde를 선택하였으며, 상압유통식 반응장치를 이용하여 촉매의 연소활성을 조사하였다. 자동차 폐촉매의 후반부가 전반부보다 촉매 활성이 우수하였다. 또한 주행거리의 증가에 따라 촉매활성은 감소하는 경향을 나타내며, 주행거리와 촉매활성은 매우 우수한 상관성을 보였다. 자동차 폐촉매의 acetaldehyde 연소활성은 매우 우수하였으며, 소규모의 배출원 제어에 활용 가능한 것으로 평가된다.

• 아시안잔디학회지
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• 제5권2호
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• pp.81-86
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• 1991

The sludge, a waste of brewery industries, was examined for potentials as a natural organic fertilizer (or soil conditioner) for lawn. Trial products were measured for changes of physical, chemical properties in laboratory and seed germination and seedling growth in green house were also tested. The results are as the following:1The sludge from distilled liquor brewery contained high quantity of organic matter which had proper physical and chemical properties for lawn fertilizer (natural organic fertilizer, soil conditioner, top-dressing mix) . It showed good characteristics in handling and capabilities to be developed as commercial products for golf courses. 2.Sludge from beer company needs proper treatment to improve physical properties for futher degradiation. It is because aggregation of the sludge particles prevented microbial activities and changing to soluble form. 3.Green carbon can be used as carbon source for organic fertilizer production using brewery sludge, but it should not contain wood extract which inhibit seed germination and seedling growth.

• 한국식품과학회지
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• 제33권2호
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• pp.245-251
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• 2001

양송이버섯을 열풍건조, 진공건조, 동결건조를 이용하여 건조하고 건조조건 및 방법에 따른 물리적 특성을 비교 분석하였다. 양송이버섯은 초기수분함량이 90%(w.b.) 이상의 높은 수분함량을 가진 농산물이며, 건조방법에 따른 건조시간을 비교 분석한 결과 열풍건조시 가장 빠른 건조시간(12 h)을 나타내었으며, 동결건조의 경우 열풍건조에 비하여 약 8시간정도 오래 걸리는 것으로 나타났다. 색차를 나타내는 ${\Delta}E$값은 높은 온도와 빠른 풍속, 그리고 낮은 진공도에서 점차 증가하는 경향을 나타내었다. 전체적인 색도변화는 동결건조된 양송이버섯이 생버섯과 비교할 때 변화가 가장 적었으며, 열풍건조된 양송이버섯은 색차가 크게 나타났다. 갈변도 변화는 열풍건조에서 높은 값을 나타내었고 동결건조에서 갈변도 변화가 가장 적었으며, 건조풍속 및 진공도의 영향보다 건조온도의 영향을 더 많이 받는 것으로 나타났다. 표면 경도의 경우 열풍건조에서 가장 높은 값을 나타내었으며 반면에 동결건조에서 경도변화가 가장 적었다. 재수화 특성을 분석한 결과 동결건조의 경우 조직사이의 공극이 크기 때문에 열풍건조 및 진공건조의 경우보다 흡수량이 많았으며 흡수되는 시간도 초기에 급격히 증가하는 경향을 보였다.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2009년도 춘계학술발표회 논문집
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• pp.23-28
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• 2009

The purpose of this study was to improve not only wet-end performances but also paper characteristics by the modification of various factors like molecular design and ionic characteristics of polyacrylamides First of all physical characteristics were observed after modify molecular design of the cationic polyacrylamides to linear, branched and cross-linked. In addition it was found analysis method to confirm branch degree of cationic polyacrylamides to combine ionic titration characteristics and spectroscopic behavior, After application of these structure modified polyacrylamides to the multiple retention systems with inorganic microparticles, it was found adjusting of branch degree of polyacrylamides was very important to optimize wet-end improvement. Second, After polymerization of amphoteric polyacrylamide to have both of cationic and anionic functional group in the polymer, we observed not only physical characteristics but also wet-end improvement to apply recycled pulp and found that the improvement of solution stability to prevent hydrolysis and increase of ash retention dramatically to compare traditional cationic polyacrylamide retention aid, Finally, After polymerization of anionic polyacrylamide, we observed not only wet-end improvement but also paper characteristics to apply preflocculation of PCC and it was found the improvements of flocculation efficiency, retention, ash retention, optical properties of the paper and bursting strength to compare traditional preflocculant of cationic polyacrylamide.

• Korea-Australia Rheology Journal
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• 제11권4호
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• pp.313-320
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• 1999

The difficulties involved in measuring rheological characteristics of complex fluids are discussed. Possible measurement errors, related to the complex nature of the sample, are reviewed. They are explained in terms of the various physical and chemical mechanisms that can cause them. This leads to possible strategies and techniques for avoiding measurement errors and for obtaining useful structural information from rheological experiments on complex materials. Finally, future evolutions in rheometry are discussed.

• Bulletin of the Korean Chemical Society
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• 제16권11호
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• pp.1046-1056
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• 1995

A topological theory has been introduced to evaluate the degree of complexation and the viscosity of polymer complexes by extending the theory of Iliopoulos and Audebert for aqueous polymer solutions. The previous theory of Iliopoulos and Audebert has offered only a semiquantitative theoretical model for polymer complex systems, whereas our present work gives a general theoretical model applicable to all the polymer complex systems. Their theories considered only the physical property term caused by the displacement of complexed points between polymer solute chains, while our theory deals with all the physical effects, caused by the displacement of complexed points entangled points in polymer solute chains. There have been predicted the characteristics of physical properties from the expression. It is exposed that the predictive values show good agreement with the experimental data for polymer complexes.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2008년도 춘계학술대회 논문집
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• pp.93-94
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• 2008

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1999년도 동계 학술대회 논문집
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• pp.509-515
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• 1999

• 한국연초학회지
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• 제13권1호
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• pp.74-81
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• 1991

This study was conducted to find out physical and chemical characteristics of burley and flue-cured tobacco leaves followed by location, growing season and leaf position during the period 1985 to 1989. The locations of flue-cured tobacco were 7(65farms) and burley tobacco were 4(40 farms). 1. Flue-cured tobacco leaves The locations of Ch'unch'on and Suwon were higher nicotine and ether extract content, Taegu and Chinju were higher total nitrogen content but Chiniju was lower red color of cured leaves than that of other location. Nicotine content increased but total sugar content decreased during the period 1985 to 1989. Nicotine and total nitrogen content increased but crude ash decreased from lower leaf position to higher leaf position. Total sugar and ether extract content were variable followed by leaf position. 2. Burley tobacco leaves. The location of Ch'onju was higher ether extract content than that of others location, but there was no significant difference the others chemical component among location. Nicotine content and red color of cured leaves increased during the period 1985 to 1989. Nicotine, total nitrogen and ether extract content increased but decreased crude ash content and brightness of cured leaf from lower leaf position to higher leaf position.