• 한국환경과학회지
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• 제30권6호
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• pp.455-463
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• 2021

This study investigated the biomass content of fluff type SRF(Solid refuse fuel) operated in B city according to the physical composition. As a result of analyzing the physical composition of SRF, it was investigated that papers 25.2%, fiber 15.1%, vinyl·plastics 42.6%, woods 9.4%, rubbers 1.5%, diapers 3.2% and incombustibles 3.0%. The average of ash and combustible content of SRF was 10.5% and 89.5%, and the higher the proportion of paper and wood, the lower proportion of ash. In addition, the biomass of SRF is 24.9%~58.0%, with an average of 42.6%.

• 한국식품영양과학회지
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• 제45권6호
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• pp.923-928
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• 2016

김치용 결구배추를 겉잎(L1), 중잎(L2), 속잎(L3)으로 세 등분하여 부위별로 일반성분을 포함한 이화학적인 성분을 측정하여 비교하였다. 조단백질 및 조지방 함량은 겉잎(L1)이 높았고, 조회분 및 탄수화물 함량은 속잎(L3)이 높았다(P<0.05). 열량은 24.5~26.5 kcal/100 g이었고 부위별로 유의적인 차이가 없었으며, 총식이섬유는 겉잎(L1)이 가장 높았다(P<0.05). 유리당은 fructose, glucose, sucrose가 확인되었으며, 속잎(L3)에서 fructose 및 glucose 함량이 높았다(P<0.05). 유기산은 citric acid, malic acid, succinic acid가 검출되었으며, citric acid와 malic acid 함량은 속잎(L3)이 높았고 succinic acid는 겉잎(L1)이 높았다(P<0.05). 총유리 아미노산의 30% 이상을 차지하는 glutamic acid 함량은 속잎(L3)에서 높았으며, ${\gamma}-aminobutyric$ acid의 함량은 겉잎(L1)이 가장 높았다(P<0.05). 결구배추 잎의 주요 미네랄 성분은 K, Na, Ca, Mg이며, 이 중 K의 함량이 가장 높았다. 총미네랄 함량은 겉잎(L1)이 가장 높았다(P<0.05). 결구배추 잎은 부위에 따라 이화학적 성분 조성이 다른 특성을 가지므로 신선편의 식재료로서 활용성이 더욱 증대될 수 있을 것으로 생각한다.

• 소성∙가공
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• 제4권4호
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• pp.398-409
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• 1995

The wear properties of the alumina short fiber reinforced tin-bronze matrix composites manufactured by hot pressing was studied at the room temperature and $350^{\circ}C.$ The wear loss of various specimens having different constituent and different density was examined by a pin-on-disc type wear testing machine. The results were discussed by the observation of the worn surface morphology and the analysis of the composition on the worn surfaces. Since the reinforced effect of the alumina fiber on the wear resistance was dependent on the strength of alloy matrix, the pressureless sintered composites having a lower matrix strength showed a marked increase in wear resistance by the fiber reinforcement. As the wear condition became severe, the fiber reinforcement was more effective. The delamination on the wear surface was observed in the pressureless sintered specimens having pores which are related to the initiation and the propagation of cracks. However, the wear mechanism acting on a big failure area was not found on the wear surfaces of the hot pressed specimens having a few pores.

• Computers and Concrete
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• 제26권6호
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• pp.515-531
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• 2020

Due to the construction difficulties of steel reinforced concrete (SRC), a new composite structure of steel and steel fiber reinforced concrete (SSFRC) is proposed for solving construction problems of SRC. This paper aims to investigate the bond properties and composition of interfacial bond stress between steel and steel fiber reinforced concrete. Considering the design parameters of section type, steel fiber ratio, interface embedded length and concrete cover thickness, a total of 36 specimens were fabricated. The bond properties of specimens were studied, and three different methods of calculating interfacial bond stress were analyzed. The results show: relative slip first occurs at the free end; Bearing capacity of specimens increases with the increase of interface embedded length. While the larger interface embedded length is, the smaller the average bond strength is. The average bond strength increases with the increase of concrete cover thickness and steel fiber ratio. And calculation method 3 proposed in this paper can not only reasonably explain the hardening stage after the loading end curve yielding, but also can be applied to steel reinforced high-strength concrete (SRHC) and steel reinforced recycled coarse aggregate concrete (SRRAC).

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1995년도 추계학술대회논문집
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• pp.181-187
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• 1995

The effet of glass fiber and graphite on the wear properies in tin-bronze alloy matrix composites was studied by a pin-on-disk type wear testing machine. The results obtained from the wear test were analized by SEM observations of worn surfaces of pins and disks and EPMA composition measurments. The amount of wear was devreased as increasing the content of glass fiber in matrix, since the alloy matrix was reinforced by glass fibers. The wear mechanism of the matrix specimen without glass fibers was proved as the contact area delamination. Oxide layer formed on sliding surface led to the increasing wear resistance. Specimens containing graphite particles showed an lubrication effect to counter disks.

• 한국축산식품학회지
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• 제40권6호
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• pp.957-968
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• 2020

The influence of muscle architecture on muscle fiber characteristics and meat quality has not been fully elucidated. In the present study, muscle fiber characteristics on the chop surface of pork loin (M. longissimus thoracis et lumborum, LTL), pennation angle degree, and meat quality were evaluated to understand the pork LTL architecture and its relationship with the loin chop quality. Muscle fiber pennation degree ranged from 51.33° to 69.00°, resulting in an ellipse-shaped muscle fiber on the surface of pork loin chop. The cross-sectional area (CSA) on the sections cut vertical to the muscle length (M-Vertical) was considerably larger (p<0.05) than that on the sections cut vertical to the muscle fiber orientation (F-Vertical) regardless of the fiber type. Pennation angle is positively correlated with CSAs of F-Vertical (p<0.05) and with Warner-Bratzler shear force (r=0.53, p<0.01). Besides the shear force, lightness and pH were positively correlated with the fiber composition and CSA of IIX fiber (p<0.05); however, the redness, yellowness, drip loss, and cooking loss were not correlated with the pennation angle and muscle fiber characteristics on the chop surface (p>0.05). These observations might help us in better understanding pork loin architecture and the relationship between the pennation angle, muscle fiber characteristics, and meat quality of pork loin chop.

• Journal of Advanced Marine Engineering and Technology
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• 제7권1호
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• pp.79-90
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• 1983

The examination for the changes of structures and mechanical properties in directionally solidified Al-Fe-Ni alloys containing the small amount of Fe and Ni was carried out by the varying the composition and solidification rate R of alloy, provided that the temperature gradient was 80 .deg.C/cm. The result were obtained as follows. A) In proportion to the increase of the solidification rate (R), the crystallized phase of this alloy was changed from the Ribbon-type structure to the Rod-type structure. B) The strength was rapidly increased in the changing process of composite shape from the Ribbon-type to the Rod-type with the solidification rate (R) increasing. C) The fiber stress (${\sigma}^f$) and Young's modulus ($E_f$) calculated for the Rod-type structure were 220 kg/$mm^2$ and 11, 800 kg/$mm^2$ respectively, which were in good accord with the rule of Mixtures.

• Food Science and Biotechnology
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• 제14권5호
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• pp.639-644
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• 2005

The aim of this study was to investigate the effect of the myosin light chain (MLC) isoforms on the muscle fiber characteristics and meat quality traits in porcine longissimus muscle. Pale, soft, exudative (PSE) samples had a lower content of essential light chain (ELC) 1S isoforms and a higher proportion of the fiber type IIB than the reddish-pink, firm, non-exudative (RFN) samples. These compositions suggest that the PSE pork has a higher glycolytic and a lower oxidative capacity than the RFN pork. Therefore, these characteristics of PSE pork might affect the metabolic rate and meat quality traits, including protein solubility. In addition, the indicator traits of the postmortem metabolic rate were related to the ELC 1F/3F ratio ($pH_{45\;min}$: r = -0.43, P < 0.001; R-value: r = 0.53, P < 0.001). These results suggest that the MLC isoform composition can affect the postmortem metabolic rate and meat quality traits.

• 한국건축시공학회지
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• 제23권5호
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• pp.509-517
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• 2023

철근 부식을 해결하기 위해 FRP에 관한 연구가 증가하고 있다. CFRP는 경량화로 시공성이 용이하며, 내식성 및 내화학성이 뛰어나 이형철근 대체제로 지목되고 있다. 하지만 CFRP는 섬유와 레진을 압착하여 만들어져 열에 취약한 단점이 존재한다. 이러한 CFRP에 관한 연구는 미비한 실정이며, 본 연구에서는 고온 가열 이후 CFRP와 GFRP의 부착강도에 관한 연구를 실시하였다. 그 결과 규사코팅 CFRP와 리브형 CFRP, GFRP 모두 비슷한 부착강도 발현을 보였다.

• 한국수산과학회지
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• 제46권4호
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• pp.337-342
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• 2013

Porphyra yezoensis is potentially an excellent source of dietary fiber, amino acids, and eicosapentaenoic acid (EPA) because this red seaweed is available in large quantities and is rich in polysaccharides, proteins, and n-3 fatty acids. This study determined the insoluble dietary fiber (IDF), soluble dietary fiber (SDF), neutral detergent fiber (NDF), acid detergent fiber (ADF), amino acid, and fatty acid contents of P. yezoensis harvested monthly from November 2011 to March 2012. The total dietary fiber (TDF) and IDF contents ranged from 27.2-34.9% and 18.5-26.9%, respectively, and were greater in March than November. The SDF content ranged from 4.9-8.4% and did not differ significantly during growth. Galactose and 3,6-anhydro galactose were the major sugars in IDF and SDF. The higher levels of galactose and 3,6-anhydro galactose in IDF might be due to associated porphyran-type polysaccharides. Mannose and xylose were also major sugars in IDF. The total amino acid contents decreased gradually from November to March. The total amino acid composition of Porphyra was dominated by alanine, glutamic acid, arginine, and aspartic acid. No significant changes in the fatty acid profile were observed throughout the study period. The dominant fatty acid during all seasons was EPA, which comprised as much as 50% of the total fatty acid content.