• Journal of Biosystems Engineering
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• 제17권2호
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• pp.156-170
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• 1992

The force-deformation relationship gives the basic physical properties of the fruits such as the bioyield point, the rupture point, and the deformations at the bioyield point and the rupture point. These informations are very important to study the stress-strain relationships of the fruits. This study was conducted to analyze those physical properties according to the sampling position of the fruits, and to determine the bioyield point, the rupture point, and the deformations at the bioyield point and the rupture point of the fruits for two different storage conditions(low temperature and normal temperature) and the storage period, and to investigate the effect of loading rate on those physical properties, the hysteresis on the loading-unloading condition and the degree of elasticity of the fruits. The results of the study were as follows : 1. The physical properties(BS, US, BD, and RD) of the test specimen selected from the different sampling positions were quite different. The values of the physical properties were shown smallest ones at the cheek of the fruits, and the statistical test results of the physical properties between the cheek from the other two positions of the fruits showed that there were significant difference at the 1 % level between them. 2. The effect of loading rate on the physical properties of the fruits was relatively large, all the considered physical propertis of the fruits increased with the loading rate, but the hysteresis loss decreased with it. 3. The physical properties of the fruits according to the storage conditions and period showed different, and the bioyield deformation and the rupture deformation of the fruits increased with the storage period, but the bioyield strength and the ultimate strength of the fruits decreased with it. The effect of the storage conditions on the those physical properties showed that the normal temperature storage condition was a little higher than the low temperature storage condition. 4. As a whole, it was shown that the bioyield strength and the ultimate strength of the pear decreased a little faster than those of the apple, and the bioyield deformation and rupture deformation of the pear increased a little faster than those of apple at the two storage conditions.

• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 1999년도 학술발표논문집
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• pp.229-232
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• 1999

수박 접목묘의 이용은 동일 지역에서의 연작 장해로 인한 만할병 방지 및 난방비 절약 등의 장점으로 점차 증가하고 있다. 이러한 장점에도 불구하고, 접목의 육묘 비용이 비싸고 접목 작업에 많은 노동력이 요구되기 때문에, 접목 자동화의 필요성은 증대될 것이다. 또한 효율적인 접목작업을 위해서 육묘 자체의 물성치에 근거한 접목 자동화 작업이 필요하다. 본 연구에서는 접목시 적용 가능한 수박묘 대목과 접수의 물성치를 분석하였다. (중략)

• 한국의류산업학회지
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• 제5권4호
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• pp.408-412
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• 2003

The micro structure of POY was modified and a wool-like touch yarn of composite fibers with different shrinkage was made. With this yarn 12 different fabrics with wool like touch were prepared. The characteristic physical property changes of the fabrics examined are as follows: 1. In all cases, the initial high shrinkage stages were observed in hot water treatment and the 3D images of complex multilayer of typical doubling fibers with different shrinkage were also observed in hot air treatment of 170C. 2. The tensile strength changes of satin and plain fabrics with the change of twist count showed similar behavior. However, WT's were slightly higher and RT's was lower in twill and satin fabrics than those in plain fabric. 3. Since a slight decrease of B's of twill fabric found with increasing twist count under given experimental condition, it could be influenced on the anti-drape stiffness was decreased and flexibility was increased. 4. A significant decrease of G values was observed in the twist count 800-1000 T.P.M However, in the twist count higher than 1000 T.P.M G values observed were kept nearly constant. 5. MIU of plain and twill fabrics showed a drastic decrease at the twist count higher than 1000 T.P.M.

• 한국의류학회지
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• 제20권1호
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• pp.157-169
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• 1996

Polyester yarns and fabrics containing three levels of $TiO_2$ delusterant were hydrolyzed with NaOH and examined for physical and morphological changes. The mechanical propertis and hand values of alkaline hydrolyzed polyester fabrics were measured using KES-FB system. Also, the relationship between the morphology and the mechanical property of alkaline hydrolyzed polyester fabrics was analyzed. The results are as follows: 1. At an initial stage of alkaline treatment, the concentration of $TiO_2$ did not affect the weight loss of the treated yarns. But by increasing treatment time, the effect of the concentration of $TiO_2$ on the weight loss of the fiber became more pronounced. The weight loss were increased in the following order; fulldull> semidull> clear 2. The effect of hydrolysis on yarn tensile strength seems to be more related to the size of the pits on the fibers rather than the number of pits. 3. Axially oriented pits occurred along the hydroyzed, delustered fiber surfaces, while such pitting was absent on hydrolyzed fiber containing no $TiO_2$. The number of voids across the surface of a fiber increased with an increase in the amount of TiOa incorporated into the fibers. The size of the voids depended on the treatment time of hydrolysis rather than the concentration of TiOa. 4. The mechanical properties and hand values of polyester fabrics were changed by alkaline treatment but were identical regardless of the concentration of TiOa. While the mechanical properties of polyester fabrics depended on the structural change of the fibers and the yarns within the fabrics as the fiber diameter became progressively smaller rather than the size and number of pits.

• 한국식품저장유통학회지
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• 제22권6호
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• pp.838-844
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• 2015

본 연구에서는 천년초의 줄기와 열매를 동결 건조하여 분말화 한 후 기능성 성분으로 Vit. $B_1$, $B_2$, $B_3$, 루틴 및 베타카로틴 등의 비타민, 식이섬유, 조 사포닌을 분석하고, 물리적 특성으로 pH 및 색도, 보수력, 보유력, 팽윤력, 용적밀도, 점액물질 함량 및 수분흡수량을 조사하였다. 천년초 분말의 비타민을 측정한 결과 비타민 C(ascorbic acid)의 함량이 가장 많았으며 줄기가 42.14 mg, 열매가 105.21 mg으로 줄기의 약 2배 이상 더 높게 나타났다. Lutein의 함량은 줄기가 열매 보다 약 2.3배 정도 더 높게 나타났으며 ${\beta}$-carotene의 함량은 열매가 줄기보다 약 2.9배 정도 높은 함량을 나타내었다. 비타민 B의 경우 줄기와 열매의 함량이 각각 비타민 $B_1$(thiamin)는 0.16 mg 및 0.15 mg, 비타민 $B_2$(riboflavin)은 0.08 mg 및 0.12 mg으로 아주 적은양이 함유되어 있었으며 비타민 $B_3$(niacin)은 0.92 mg 및 1.01 mg으로 나타났다. 식이섬유는 줄기에서 수용성 식이섬유가 45.24%, 불용성 식이섬유가 22.15%로 열매보다 높게 나타났다. 조 사포닌은 줄기가 19.30 mg/g, 열매가 25.10 mg/g으로 나타났다. 물리적 특성의 pH는 줄기가 pH 5.34, 열매가 pH 5.07로 약산성이었고 보유력을 제외한 보수력, 용적밀도 및 팽윤력은 줄기가 높게 나타났으며 점질물질의 함량과 수분흡수량도 줄기가 열매보다 더 높게 나타났다. 이러한 결과 보아 천년초에 함유되어 있는 비타민류, 식이섬유 등은 천연 기능성 소재로 이용 가능하며 물리적 특성을 잘 이용한다면 가공적성 및 제품의 기호성을 증진시키는데 유용한 식품소재가 될 것으로 기대된다.