• 한국재난정보학회 논문집
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• 제15권3호
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• pp.402-408
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• 2019

연구목적 : 포소화설비에 사용되는 중발포 소화약제는 기류에 영향이 적어 방출거리를 유지 할 수 있을뿐만 아니라 소화약제도 효율적으로 사용 할 수 있기 때문에 중발포기를 이용하여 발포배율 및 소화성능을 실험으로 밝히고자 한다. 연구방법 : 본 연구를 위해 중발포 시험장치를 제작하여, 합성계면활성 제포를 대상으 로 유류화재(B급) 소화성능 및 발포배율 분석과 포소화약제 소모량을 측정하고 분석하였다. 연구결과: 중발포기로 발포배율을 측정한 결과 팽창율이 26.1배의 중발포 배율로 나타났으며, 유류화재 20단위 소화모형 실험결과 소화시간이 고발포 및 저발포 보다 빠르게 나타나, 수동식설비인 호스릴 또는 중발포기 적용이 가능할 것으로 본다. 결론: 본 연구를 통해 중발포 포소화약제 발포성능 및 소화성능이 우수하게 나타나는 점을 고려하여 중발포 소화약제를 활용한 호스릴 또는 중발포기의 기술기준 도입이 필요하다.

• 한국세라믹학회지
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• 제13권3호
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• pp.21-27
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• 1976

Foam formation of Slag-Quartz-$\textrm{Na}_2\textrm{CO}_3$ system was investigated. The foaming agent used was sulphide and sulphate compounds which are present in the slag. The microstructures and x-ray analysis of foam slag, the effect of composition and particle size of slag on the formation temperature, and foam size and distribution of slag foam were studied. The Increment of $\textrm{Na}_2\textrm{O}$ in the slag batch composition decrease the initial foam formation temperature and enhance the foam growth. The formation of temperature and soaking time had pronounced effect on the foam growth and increasing the glass phase in the slag foam.

• Fisheries and Aquatic Sciences
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• 제6권4호
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• pp.187-193
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• 2003

The performance of a foam fractionator to remove TAN, $NO_2,\;NO_3$, TSS, protein, and $PO_4-P$ at different superficial air velocities and foam overflow heights was evaluated in a lab-scale seawater recirculating system for culture of Korean rockfish (Sebastes schlegeli). The foam overflow rates increased with the increase of superficial air velocities, but decreased with the increase of foam overflow heights. Concentrations of all the water quality variables in the foam condensates increased with the increase of foam overflow height, but decreased with the increase of superficial air velocities. TSS, protein, and phosphate enrichment factors were within the range of 6.4-39.4, 1.6-7.3 and 1.2-3.9, respectively. Low values of TAN, $NO_2,\;and\;NO_3$ enrichment factors were obtained and they indicate that foam fractionation is rot an effective way to remove dissolved inorganic nitrogen. The calculated maximum daily removal values for TSS and protein were 10.9 and 1.4g, respectively.

• 대한가정학회지
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• 제11권1호
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• pp.26-43
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• 1973

This study was carried out on the Sewbility of Urethane Foam usually used as coldproof lining. The Sewability was estimated with the Puckering Grade and Seam Efficiency according to the thicknes of urethane foam, fineness and material of sewing thread, and the sort of covering fabric. The result shows the following ; 1. The thick foam proportinally shows the low Puckering Grade. 2. Effect on the sewability is small in fineness of sewing thread but large in material. Especially silk thread shows the greatest sewability in foam sewing. When the material of covering fabric is same as that of sewing thread (for example ; p/c fabric and p/c thread) the sewability is excellent in special. 3. Taffeta in covering foam is not suitable to foam sewing, satin and twill show superior sewability without reagrd to the thickness of foam. 4. In case of sewing foam covered with tricot, optimum thickness of foam and fineness of sewing thread through pretest must determine. 5. The thicker foam is the better seam efficiency tends, and Seam Efficiency largely effects to the strength of the sewing thread itself. 6. The seam Efficiency can heighten with the strength of sewing thread in proportion to that of covering fabric.

• Journal of Mechanical Science and Technology
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• 제19권10호
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• pp.1932-1938
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• 2005

Graphite foams consist of a network of interconnected graphite ligaments and are beginning to be applied to thermal management of electronics. The thermal conductivity of the bulk graphite foam is similar to aluminum, but graphite foam has one-fifth the density of aluminum. This combination of high thermal conductivity and low density results in a specific thermal conductivity about five times higher than that of aluminum, allowing heat to rapidly propagate into the foam. This heat is spread out over the very large surface area within the foam, enabling large amounts of energy to be transferred with relatively low temperature difference. For the purpose of graphite foam thermosyphon design in electronics cooling, various effects such as graphite foam geometry, sub-cooling, working fluid effect, and liquid level were investigated in this study. The best thermal performance was achieved with the large graphite foam, working fluid with the lowest boiling point, a liquid level with the exact height of the graphite foam, and at the lowest sub-cooling temperature.

• 한국양식학회지
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• 제16권4호
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• pp.216-222
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• 2003

In a simulated seawater aquaculture system, effects of different operating factors like the superficial air velocity (SAY), hydraulic residence time (HRT), protein concentration and foam overflow height on the removal of total suspended solids (TSS) by a foam fractionator, with 20 cm diameter and 120 cm height, were investigated. This experiment was performed on batch and consecutive modes for different combinations of the tested factors, using synthetic wastewater. In 5 consecutive trials, TSS concentration in culture tank water decreased faster, when the foam fractionator was operated at higher SAV and lower HRT. In batch trials, with increasing SAV, TSS removal rate increased, but decreased with increasing HRT. Higher protein concentration in the bulk solution resulted in higher TSS removal rate. TSS concentration in the collected foam condensates increased but the foam overflow rate decreased with increasing foam overflow height. Foam fractionation was effective for removing TSS in seawater aquaculture systems and its performance largely depended on the operating parameters, especially superficial air velocity.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집B
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• pp.641-645
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• 2001

In this paper, it is discussed that active noise control in a circular duct using smart foam. Firstly, it is demonstrated that the potential of the conventional smart foam, proposed by Fuller, for active noise control in a duct. Conventional smart foam is not applicable to active noise control in a duct having flow. Thus, this paper presents a ring-type smart foam as an alternative. The ring-type smart foam consists of polyurethane acoustic foam of lining shape and PVDF film embedded in the foam. The embedded PVDF element acts as an actuator to reduce noise at lower frequencies and the foam absorbs noise at higher frequencies. A filtered-x LMS controller is used to minimize the signal from the error microphone. Experiments are executed to reduce broadband and tonal noise.

• 마이크로전자및패키징학회지
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• 제30권1호
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• pp.55-62
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• 2023

본 연구에서는 서로 다른 Pore per inch (PPI, 1 inch 당 pore의 수)를 갖는 Ni-foam 사이에 Sn-3.0Ag-0.5Cu(wt.%, SAC305) 솔더 침지 공정을 수행하여 Ni-foam/SAC305 복합 솔더를 제조한 후, 이를 천이액상 확산 접합(Transient liquid Phase bonding, TLP bonding) 공정에 적용하여 형성된 접합부의 미세구조 분석 및 기계적 특성 평가가 수행되었다. 제조된 Ni-foam/SAC305 복합 솔더 프리폼 (Solder preform)은 Ni-foam 및 SAC305로 구성되었으며, Ni-foam 계면에는 (Ni,Cu)₃Sn₄ 조성의 금속간 화합물이 형성되었다. TLP 접합 공정 수행 시, Ni-foam 계면의 금속간 화합물은 (Ni,Cu)₃Sn₄+Au로 변환 되었으며, 접합 시간이 증가할수록 Ni-foam과 SAC305가 지속적으로 반응하면서 접합부는 금속간 화합물로 변환되었다. 130 PPI Ni-foam/SAC305 복합 솔더 접합부가 가장 빠른 속도로 금속간 화합물로 변화되는 것을 확인하였다. 기계적 특성에 미치는 Ni-foam의 영향을 확인하기 위해 전단 시험 수행 결과, TLP 접합 초기에 모든 조건의 솔더 접합부는 50 MPa 이상의 우수한 기계적 특성을 나타내었으며, 접합 시간이 증가할수록 전단 강도는 증가하는 경향을 나타내었다.

• 농업과학연구
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• 제10권2호
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• pp.345-353
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• 1983

수용액에 존재하는 중금속이온중의 Hg(II)을 정량적으로 분리 회수하기 위하여 DBHQ(5. 7-dibromo-8-hydroxyquinoline)을 Open-pore polyurethane foam (OPP foam)에 침윤시켜 수지의 응용성을 연구하였다. Hg(II)의 흡착은 DBHQ와 1:2 몰비의 착물형성이 이루어지며 Hg(II)의 흡착과 분리는 Batch법으로 실험하여 최적조건을 결정하였다. 가장 양호한 흡착은 DBHQ의 등전점인 pH5.0 부근에서 그리고 분리하는데는 4M-HCl, 50% 아세톤 용매를 사용하였을 경우가 비교적 정량적인 흡착과 분리가 이루어지는 조건이었으며 이와같은 결과를 기초로 DBHQ-OPP foam에 대한 Hg(II)의 흡착 및 분리에 대한 반응메카니즘을 제안했다.

• Ocean and Polar Research
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• 제25권3호
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• pp.269-275
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• 2003

Effects of different operating factors including superficial air velocity (SAV), hydraulic residence time (HRT), protein concentration, and foam overflow height on protein removal by a foam fractionator in simulated seawater aquaculture system were investigated. This experiment was conducted on batch and consecutive modes at different combinations of the affecting factors. The foam fractionator had a diameter of 20cm and a height of 120cm and the experiment was conducted with synthetic wastewater. In 5 consecutive trials, protein concentrations in culture tank water decreased faster when the foam fractionator was operated at higher SAVs and lower HRTs. In batch trials, protein removal rates increased with an increase in SAV but decreased with an increase in URT. Higher protein concentrations in the bulk solution resulted in higher protein removal rates. Protein concentrations in the collected foam condensates increased but the foam overflow rates decreased with the increase of foam overflow heights. The results of this experiment indicate that foam fractionation would be an effective way for protein removal in seawater aquaculture systems and the performance of the foam fractionator depends largely on the operating parameters, especially SAV.