• Asian-Australasian Journal of Animal Sciences
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• 제29권5호
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• pp.753-758
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• 2016

Moisture content influences physiological characteristics of microbes and physical structure of solid matrices during composting of animal manure. If moisture content is maintained at a proper level, aerobic microorganisms show more active oxygen consumption during composting due to increased microbial activity. In this study, optimum moisture levels for composting of two bedding materials (sawdust, rice hull) and two different mixtures of bedding and beef manure (BS, Beef cattle manure+sawdust; BR, Beef cattle manure+rice hull) were determined based on oxygen uptake rate measured by a pressure sensor method. A broad range of oxygen uptake rates (0.3 to 33.3 mg $O_2/g$ VS d) were monitored as a function of moisture level and composting feedstock type. The maximum oxygen consumption of each material was observed near the saturated condition, which ranged from 75% to 98% of water holding capacity. The optimum moisture content of BS and BR were 70% and 57% on a wet basis, respectively. Although BS's optimum moisture content was near saturated state, its free air space kept a favorable level (above 30%) for aerobic composting due to the sawdust's coarse particle size and bulking effect.

• 한국한의학연구원논문집
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• 제15권2호
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• pp.119-124
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• 2009

The purpose of this study was investigation of quantitative analysis of marker substances in Paeonia lactiflora extracts by solid fermentation. High performance liquid chromatography (HPLC) for the determination of albiflorin and paeoniflorin in P. lactiflora extracts by solid fermentation, the separation method was performed on C18 column ($250\;mm\;{\times}\;4.6\;mm$, $5\;{\mu}m$, RS tech) using gradient solvent mixtures of water-acetonitrile with photodiode array detector (230nm). The flow rate was 1.0 ml/min. Retention time of albiflorin and paeoniflorin was about 28.88, 31.92 min and linearity of calibration was showed good result(r2 = 0.9998, 0.9996), respectively. Content of albiflorin was $0.090\;{\pm}\;0.03%$ in P. lactiflora extract(control), $0.102\;{\pm}\;0.00%$ in P. lactiflora extract fermented with Paecilomyces japonica, $0.056\;{\pm}\;0.01%$ in P. lactiflora extract fermented with Ganoderma lucidum, $0.093\;{\pm}\;0.00%$ in P. lactiflora extract fermented with honey and $0.046\;{\pm}\;0.00%$ in P. lactiflora extract fermented with Nuruk. Content of paeoniflorin was $4.506\;{\pm}\;0.13%$ in control, $2.599\;{\pm}\;0.04%$ in P. lactiflora extract fermented with Paecilomyces japonica, $1.222\;{\pm}\;0.03%$ in P. lactiflora extract fermented with Ganoderma lucidum, $2.750\;{\pm}\;0.05%$ in P. lactiflora extract fermented with honey and $0.847\;{\pm}\;0.00%$ in P. lactiflora extract fermented with Nuruk, respectively. Content of the marker substances did not increase in all fermentation experiment group.

• 농업과학연구
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• 제49권2호
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• pp.341-355
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• 2022

This research was to examine the differences in post-harvest quality of melons depending on the harvest time after fruit setting. Musk melon cultivar 'K3' plants were grown in glass house conditions with a hydroponic system, and the fruits were harvested at 50, 60, and 70 days after fruit setting. The post-harvest characteristics of melons stored at 7℃ were measured over 32 days. The harvested fruits at 50, 60, 70 days after fruit setting did not differ significantly in weight, height, or size. Solid sugar content was highest in the fruits harvested at 70 days after fruit setting, but firmness, L* value, and respiration rate were highest in the fruits harvested at 50 days after fruit setting. When the harvested melons were stored at 7℃, 'K3' melons responded differently according to the harvest days after fruit setting. The major changes during storage of 'K3' melons can be summarized as follows: Firmness, respiration, moisture content, and general appearance index during storage were highest in the melons harvested at 50 days after fruit setting, but soluble solid content, fresh weight loss, and sensory evaluation were high in the melons harvested at 60 and 70 days after one. During storage at 7℃, there were no significant differences in the appearance of 'K3' melons harvested at different periods after fruit setting, but difference in soluble solid content and taste were noted. It is recommended that the fruit of 'K3' melon plants be harvested about 60 days after fruiting to provide consumers with the highest quality for taste and for storage.

• 자원리싸이클링
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• 제29권5호
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• pp.28-37
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• 2020

본 연구에서는 알칼리 영역의 소듐바나데이트(NaVO₃) 수용액을 출발물질로 사용하여 침전온도, 염화암모늄 첨가량 및 첨가방법, 수용액의 바나듐 및 수산화나트륨 함량 등이 암모늄메타바나데이트 침전거동에 미치는 영향을 알아보았다. 수용액 pH가 감소할수록, 염화암모늄 첨가량 그리고 수용액의 바나듐 함량이 증가할수록 암모늄메타바나데이트 침전률이 증가하였다. 본 연구조건에서 90% 이상의 암모늄메타바나데이트 침전률을 얻기 위한 기본 조건은 수용액 바나듐 함량 10,000mg/L, 고체 염화암모늄 첨가량 2당량, 침전온도 상온, 침전시간 2시간 이었다. 암모늄메타바나데이트는 침전속도 증가에 따라 침전물 크기가 감소하였으며, 특히 염화암모늄을 액체로 투입할 때, 침전속도는 가장 느리며 침전물 크기는 가장 크게 나타났다. 염화암모늄을 고체로 첨가하여 1차 침전반응 후, 새로운 반응물을 첨가하여 2차 침전반응을 시킬 때, 고체 염화암모늄을 첨가한 침전반응은 수용액에 존재하는 침전물에 영향을 받지 않았다. 그러나 염화암모늄 수용액을 첨가하였을 때는 수용액에 존재하는 침전물 표면에 침적되어 그 크기를 증가시켰다. 수용액 온도에 따른 암모늄메타바나데이트 용해도 차이에 의하여, 바나듐 함량 10,000mg/L 수용액에서는 침전온도가 암모늄메타바나데이트 침전에 영향을 미치며, 바나듐 함량 30,000mg/L 이상의 고농도 수용액에서는 침전온도가 침전반응에 영향을 미치지는 못하였다.

• 대한기계학회논문집B
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• 제39권11호
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• pp.843-851
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• 2015

질소산화물 저감에 사용하는 solid SCR용 고체상 암모늄 저장물질의 하나인 magnesium ammine chloride에 대한 실험실 규모에서의 제조방법과 제조한 물질의 분석연구를 수행하였다. 기저물질인 염화마그네슘에 암모니아 가스를 흡착하기 위한 실험조건의 도출을 위하여, Van't Hoff Plot으로 평형압 선도를 계산하였고, 간이반응기를 제작한 후, magnesium ammine chloride를 제조하였다. DA, IC, FT-IR, XRD, SDT 등으로 제조한 시료의 성분을 분석하였고, 제조한 시료에 수분이 존재한다는 것을 알 수 있었다. 암모니아 가스 흡착률을 증대하기 위하여 수분 제거에 적절한 새로운 실험방법을 제안하였고, 제안한 방법을 적용한 결과, 암모니아 가스의 흡착률이 대략 100%에 도달하였다.

• 유기물자원화
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• 제25권1호
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• pp.23-33
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• 2017

본 연구에서는, 높은 함수율을 가진 음식물류 폐기물을 Bio-dying 공법을 이용하여 처리하였을 때 수분과 유기물의 변화정도를 분석하였으며 음식물류 폐기물 처리 시 온도와 염도가 Bio-dying 공법의 운전특성에 미치는 영향을 평가하였다. 또한, Bio-drying 후 분해산물의 SRF(Solid Refuse Fuel)로서의 가치 평가를 위한 펠렛 제조의 최적조건 도출 및 SRF의 발열량 분석을 통한 고형연료로서의 가치를 평가하였다. 그 결과, 1일 투입량에 따른 온도, $CO_2$ 농도, 유기물 제거율과 무게 감소율 값을 분석하였다. 유기물 제거율과 무게 감소율은 투입량 2.4 kg/day에서 각각 86%, 68%로 최대값을 나타내었다. 이를 통해 최적 음식물류 폐기물 투입량은 2.4 kg/day라 판단되었다. 펠렛 성형 결과, 원료 함수율이 10~25% 이내에서 펠렛 제조가 가능하고, 외형유지와 강도면에서 가장 좋은 품질결과를 보여준 함수율 25%가 가장 적합하다고 판단되었다. Bio-drying 후 분해산물의 SRF 고위발열량은 3,500 kcal/kg 이상의 값을 나타내었다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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• pp.215-222
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• 1997

Flow experimental on not to be solid mortar which use Quenched Blast-furnace Slag as a fine aggregate was carried out for basic research data about fundamental study of application possibility of Quenched Blast-furnace Slag as a fine aggregate. It gives following result. The substitution rate is inversely proportional to Flow and C/S-rate same that. The relation with W/C-rate augment appear proportional : in case of C/S-rate, 1:3 increasing degree is a half of sand mortar that. Consequencely, Quenched Blast-furnace Slag motar is a counteraction to Flow in as same water content per unit. But suitable substitution rate and C/S-rate influence a little to the mortar consistency. And that reason, if C/S-rate and substitution rate will be regulated when we mix the mortar with quenched Blast-furnace Slag. that will be economic mixture.

• 환경위생공학
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• 제10권3호
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• pp.29-34
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• 1995

This study was on the characteristics and heating values analysis of municipal solid wastes according to the volume- rate garbage collection system in Busan. Each waste sample was analyzed to obtain physical composition, proximate analysis, heating value, chemical composition. And the heating value were compared with those of the past waste collection system. The average physical composition of A.P.T. area was food waste 54.0~65.7% , while that of common residence was food waste 57.9~61.2% . The density of solid waste were largely different for site and the highest densities of waste was $399.6kg/m^{3}$ from Market. The low heating value of waste from residence site was 996.9kca1/kg~1, 238.1 kcal/kg which was lower than 1, 000kcal/kg~1, 800kca1/kg of the past wastes. These difference was mainly due to the difference of moisture content and the amount of vegetables.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2017년도 제48회 춘계학술대회논문집
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• pp.495-497
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• 2017

열가소성 탄성중합체 바인더를 사용한 열가소성 추진제는 열경화성 추진제와 비교하여 중간 정도의 성능과 기계적 특성을 나타내지만 원재료 비용이 저렴하고, 제조 공정이 단순하며, 취급 공정이 안정적인 장점으로 인해 다양한 분야에서 폭 넓게 사용될 것이라 예측된다. 다양한 분야에서 열가소성 고체 추진제의 활용을 위해 주 원재료인 산화제, 금속연료 및 첨가제의 함량에 따른 특성 변화를 연구하여 향후 예상되는 열가소성 추진제의 수요에 대응하고자 한다.

• Mycobiology
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• 제38권2호
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• pp.137-143
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• 2010

The production of conidia of entomopathogenic Beauveria bassiana by solid-state fermentation was studied for the development of a biocontrol agent against aphid Myzus persicae. The optimal conditions for conidia production on polished white rice were 40% moisture content, $25^{\circ}C$ culture temperature, 2-day-old seeding culture grown in 3% corn meal, 2% rice bran, 2% corn steep powder medium, initial conidia concentration of $10^7$ conidia/g in the wet rice, 10% inoculum size, and use of a polyethylene bag as a container. The polyethylene bag containing inoculated rice was hand-shaken every 12 hr during fermentation. Using optimal conditions, the maximum conidia production obtained was 4.05 g conidia/100 g dry rice after 14 days of cultivation, a rate 2.83 times higher than conidia yield of pre-optimization.