• Journal of Applied Biological Chemistry
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• 제54권4호
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• pp.252-257
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• 2011

농업 환경 중에 과잉으로 축적한 질산이온의 제거를 위하여, 질산이온 흡수력이 우수한 Enterobacter amnigenus GG0461 균주를 분리하였다. 이 균주는 Pseudomonas agar F (PAF) 배지에 배양하였을 때, 3,000 ppm (50 mM) 이상의 질산이온 흡수가 가능하므로, 농업용 토양, 축산폐수, 산업폐수를 포함한 오염된 환경의 질산이온 제거를 위한 좋은 후보 균주가 될 수 있다. GG0461 균주의 대량생산을 위한 상업용 배지를 개발하기 위하여 PAF 배지 성분을 상업용 재료로 대체하고, 균주의 성장과 질산이온 흡수 활력을 측정하였다. 탄소원인 글리세롤은 상업용 제품으로 대체하였고, 질소원으로 tryptone과 효모추출물, 대두박, 생선발효액을 배양실험에 사용하였다. 균주의 성장과 질산이온 흡수활력은 2% tryptone을 첨가한 배지에서 가장 우수하였고, 효모추출물, 대두박, 생선발효액의 순으로 효과가 나타났다. Tryptone을 2% 첨가한 배지에서 균주의 질산이온 흡수는 배지의 pH를 낮추었으며, 이것은 질산이온의 흡수가 nitrate/proton antiporter의 활성으로 나타남을 의미한다. 이상의 결과에서 상업용 tryptone을 사용한 배지는 균주의 생리활성에 적합하였으며, peptone을 제외한 PAF 배지의 각 성분은 그것에 해당하는 상업용 재료로 대체할 수 있었다. 결론적으로, GG0461 균주의 배양을 위한 상업용 배지성분 조성은 2% tryptone과 1% glycerol, PAF 배지를 위한 무기이온들로 결정하였다.

• KSBB Journal
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• 제9권5호
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• pp.469-474
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• 1994

본 연구의 목적은 시판 퍼l녹시계 제초제 2,4-D의 생물학적 처리의 가능성을 평가하기 위한 것이다. 시판 페녹시계 제초제는 2,4-0 아민염 으로셔 2,4-0( 40%)와 용제 (60 % )로 구성 되었다. 2,4-D에서 농화배양에 의해 얻어진 미생물 컨소시염은 탄소원 빛 에너지원으로서 2,4-0를 이용하였다. 이 설험에서 2,4-D분해의 최적 pH 와 기 질농도는 각각 7.0과 54mg/ E 였다. Yeast extract와 ascorbic acid의 첨가는 2,4-0의 분해 와 미생물의 생장을 촉진시켰다. 2,4-0를 정량하기 위해 HPLC가 사용되었으며 그 과정에셔 중간대사물질로셔 2,4-0CP가 분리되었다. GC MS는 2,4-0CP를 입증하기 위하여 사용되였다. 배양중의 UV scans 결과, 2,4-0의 최대흡광치는 배양이 진행되는 동안 감소되었으나, spectral 및 peak 변화는 보여주지 않았다.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2011년도 정기 학술발표대회
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• pp.91-91
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• 2011

The quality of the surface layer in concrete structures plays an important role in the durability of the concrete. The concrete factory products are made as they improve the appearance of the surface and compressive strength in need. A common criterion to judge the quality of concrete products frequently seen in our daily life appears to be "beauty" in terms of consistent shaping. However, as for most concrete curb in such areas where a large amount of anti-freezing agents(NaCl) and ice and snow melting agents(CaCl2) are spread over roads to ensure road safety during the winter season, since deterioration advances from the surface, scaling is seen on the surface concrete due to deterioration which combined freezing damage and salt damage. Especially, In cold northern districts, the spreading amount of deicing salts increases by regulation of studded tire use, and the scaling of the concrete products, the various parts of concrete structures for roads is increasing in recent years. In this study, L-shape concrete curb were targeted, the permeable form method with the commercial permeable sheet was applied to it and the improvements of the quality were examined. By the permeable form method, surface layers got strengthened, which prevented permeation of the deterioration factor from the outside, and the scaling resistance of the upper surface where the permeable sheet was applied improved exceedingly. It will be expected by applying the permeable form method to various concrete products that frost resistance improves and scaling damage decreases.

• 한국분말재료학회지
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• 제20권1호
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• pp.37-42
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• 2013

$YAG:Ce^{3+}$ phosphor powders were synthesized using a $Al_2O_3$ seed (average particle size: 5 ${\mu}m$) by the polymer solution route. PVA solution was added to the sol precursors consisting of the seed powder and metal nitrate salts for homogeneous mixing in atomic scale. All dried precursor gels were calcined at $500^{\circ}C$ and then heated at $1400^{\circ}C{\sim}1500^{\circ}C$ in $N_2/H_2$ atmosphere. The final powders were characterized by using XRD, SEM, PSA, PL and PKG test. All synthesized powders were crystallized to YAG phase without intermediate phases of YAM or YAP. The phosphor properties and morphologies of the synthesized powders were strongly dependent on the PVA content. Finally, the synthesized $YAG:Ce^{3+}$ phosphor powder heated at $1500^{\circ}C$, which is prepared from 12:1 PVA content and has an average particle size of 15 ${\mu}m$, showed similar phosphor properties to a commercial phosphor powder.

• 한국전기화학회:학술대회논문집
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• 한국전기화학회 1998년도 전지기술 심포지움
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• pp.153-166
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• 1998

Lithium ion Batteries commercially available since the early nineties in Japan are going to be more and more important for portable electronic devices and even EV applications. Today several companies around the world are working hard to join to market for Lithium secondary batteries. Based on the growing interest for commercial use of batteries also the materials have to be reviewed in order to meet large scale production needs. The requirements especially for electrolytes for lithium batteries are extremely high. The solvents and the lithium salts should be of highest purity. So the supply of these chemicals including packaging, transportation and storage but also the handling in production are critical items in this field. Frolic impurities are very critical for LiPF6 based electrolytes. The influence of water is tremendous. But also the other protic impurities like alcoholes are playing an Important role for the electrolyte quality. The reaction of these species with LiPF6 leads to formation of HF which further reacts with cathode materials (spinel) and anode. To understand the role of the protic impurities more clearly the electrolyte was doped with such compounds and was analyzed for protic impurities and HF. These results which directly show the relation between impurities and quality will be presented and discussed. In addition several investigations on different packaging materials as well as methods to analyze and handle the sensititive material will be addressed. These questions which are only partly discussed in literature so far and never been investigated systematically cover some of the key parameters for understanding of the battery chemicals. This investigation and understanding however is of major importance for scientist and engineers in the field of Lithium ion and Lithium polymer batteries.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.1256-1261
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• 2009

Seawater amounts to 70% of the earth and represents a quite unlimited resource for the production of fresh water by desalination processes and for the extraction of dissolved salts present in it. Recently, the falling film evaporation has increased in interest as an efficient method for seawater desalination system. In the desalination system, the flow characteristics of the falling film is very important issue to make highly efficient system. So, this study is taken to investigate numerically the falling film thickness on the inlet Renold Number ranges are 400 to 700. Numerical simulations are performed using FLUENT6.3.26, a commercial CFD code.

• Journal of Yeungnam Medical Science
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• 제11권1호
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• pp.30-34
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• 1994

염산 lidocaine의 피하 주입시 발생되는 고통을 감소시키기 위하여 8.4% sodium bicarbonate로 중화시켜 사용해 보았다. 지원자를 대상으로한 실험군의 100%에서 예상된 효과를 얻을 수 있었다.

• The International Journal of Costume Culture
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• 제6권1호
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• pp.11-18
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• 2003

Agricultural drainage salt generated during irrigation of crops in San Joaquin Valley, California, exceeds 600,000 tons annually and cumulates in the field in a rapid rate. As a result, the waste is taking out more farmlands for salt storage and disposal, imposing serious concerns to environment and local agricultural industry. In searching for a potential solution to reduce or eliminate the waste, this research explored feasibility of producing a value-added product, sodium sulfate, from the waste and utilizing the product in textile dyeing. The results indicated that sodium sulfate could be produced from the salt and could be purified by a recrystallization method in a temperature range within the highest and lowest daily temperatures in summer in the valley. The recovered sodium sulfate samples, with purities ranging from 67% to 99.91, were compared with commercially available sodium sulfate in the dyeing of levelling dyes. In nylon fabrics, the salt samples had little color difference in the dyeing with C.I. Acid Yellow 23 and C.I. Acid Blue 158. All salt samples' gray scale was 5 grade. In wool fabrics, the salt samples had little color difference in dyeing with C.I. Acid Yellow 23 and C.I. Arid Blue 158. All salt samples' gray scale was 5 grade. Generally, the dyeing of levelling dyes using recovered salts from farm drainage had little color difference than the dyeing of levelling dyes using commercial sodium sulfate.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.253-256
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• 2002

$Gd_2O_3$:Eu phosphor particles were prepared by largescale ultrasonic spray pyrolysis process. The morphological control of $Gd_2O_3$:Eu particles in spray pyrolysis was performed by adding polymeric precursors into spray solution containing nitrate salts. The effect of composition and amount of polymeric precursors on the morphology, crystallinity, and photoluminescence characteristics of $Gd_2O_3$:Eu particles was investigated. The influence of chain length of PEG on the morphology and photoluminescence intensity was investigated. $Gd_2O_3$:Eu particles prepared from aqueous solution containing no polymeric precursors had a hollow structure and rough surfaces after annealing process. The phosphor particles prepared from solution containing 0.1M CA and 0.lM PEG with high molecular weight as 1,500 had a spherical and filled morphology and the highest photoluminescence intensity, which was 48% higher than that of the $Y_2O_3$:Eu commercial product.

• The Korean Journal of Ceramics
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• 제5권2호
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• pp.142-147
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• 1999

The interaction between commercial $Si_3N_4$ powder and two types of additives (nitrate and oxide additives) during the sintering of $Si_3N_4$ was investigated. The nitrates solution or oxide particles were added as a sintering additives. The surface of mixed powder was observed with FT-IR, TG, and HREM. DTA was used to characterize the reactivity of the powders. The formation of crystalline phases and phase transformation were analyzed by XRD. The adsorption of the additives on the surface of silicon nitride was confirmed in the nitrate salts. It was shown that the adsorption occurred by interaction between the amorphous $SiO_2$ layer on the $Si_3N_4$ surface and metal cations $(Al^{3++\; and \;Y^{3+})$ and anions $(NO_3\;^-\; or\; OH^-)$, resulting in a higher degree of homogeneous distribution of additives.