• Title, Summary, Keyword: tank mixture

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Weed control efficacy of the tank-mixture between quizalofop-P-ethyl and KSC-35089, a newly synthesized N-arylphthalimide compound (신규합성된 N-arylphthalimide 화합물 KSC-35089와 Quizalofop-ethyl의 혼합처리효과)

  • Kim, Tae-Joon;Song, Jae-Eun;Choi, Jung-Sup;Kim, Hyoung-Rae;Pyon, Jong-Young;Cho, Kwang-Yun
    • The Korean Journal of Pesticide Science
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    • v.6 no.3
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    • pp.183-192
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    • 2002
  • Herbicidal effect of KSC-35089, a newly synthesized N-arylphthalimide compound, was examined, and its interaction with quizalofop-P-ethyl when foliar applied as a tank-mixture was evaluated under a greenhouse condition. KSC-35089 showed stronger herbicidal activity on broadleaves than grasses, suggesting that it would be an appropriate partner for non-selective weed control with quizalofop-P-ethyl, a strong grasskilling ageant. In general, the interaction between KSC-35089 and quizalofop-P-ethyl appeared to be additive, which indicates each compound acts on whole plant level independently. This additive interaction was confirmed in a spectrum test using 19 grasses and 26 broadleaves. Under the greenhouse condition, all tested plants were controlled around 90% level through a foliar application with a tank-mixture of KSC-35089 at 64 g ai/ha and quizalofop-P-ethyl at 32 g ai/ha. Further study would be required on the action mechanism of this additive interaction.

CFD Simulation for Mixture Characteristic of DME-Propane Liquified Fuels (DME-Propane 액화연료의 혼합특성에 대한 CFD 시뮬레이션)

  • Kim, Cha-Hwan;Chun, Seuk-Hoon;Shin, Dong-Woo;Kim, Lae-Hyun;Lee, Hyun-Chan;Baek, Young-Soon
    • Korean Chemical Engineering Research
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    • v.50 no.2
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    • pp.328-333
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    • 2012
  • In this study, CFD simulation was performed with commercial CFD code FLUENT for the 3D mixing tank model (1 m in a diameter and 2.5 m in a height) of DME-Propane liquified fuels. Initial condition set-up with existence of DME 146 l at the upper side of mixing tank and Propane 770 l at the lower side of mixing tank. Characteristics of mixture and fluid flow were observed for 34 hours simulation. Two liquid fuel were uniformly mixed within range of 3 mol% after 24 hours, and range of 1 mol% after 34 hours. The simulation result following 4 hours was verified with KOGAS experimental data.

Material Development of Eco Water Tank with High Density Polyethylene and Low-temperature Concrete (친환경 저수조를 위한 고밀도 폴리에틸렌과 저열성 콘크리트 합성재료 개발)

  • Chang, Chun-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.4
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    • pp.133-140
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    • 2010
  • The purpose of this study is to evaluate the new eco water tank which is made of high density polyethylene and concrete with low temperature cement. The strength and failure mode of eco water tank was examined through tensile test with mixture of concrete and HDPE, temperature monitoring for various kind of concrete, admixture contains etc. The strength and failure mode were examined through tensile test with mixture of concrete and HDPE, temperature monitering for different kinds of concrete, strength test with different admixtures etc. It was found that shear connector between concrete and HDPE effects significantly contributed to the combined structures. ㄱ type shear connector results in tensile strength of up to 40% compared to that of V type shear connector. Based on test result, the new eco composite tank improved the stability and safety the old one and demonstrated the applicability and capability.

Comparison of EG/AD/S and EG/AD model ice properties

  • Kim, Jung-Hyun;Choi, Kyung-Sik
    • International Journal of Ocean System Engineering
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    • v.1 no.1
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    • pp.32-36
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    • 2011
  • EG/AD/S type model ice was originally selected as the primary model ice material for the MOERI ice tank in Korea. The existence of a sugar component in the EG/AD/S mixture may cause a serious maintenance problem. In order to understand the influence of sugar in the original model ice, a series of tests with EG/AD/S and EG/AD model ices were performed, and their material properties compared. Because the target strength of model ice in the full-scale MOERI ice tank is expensive and difficult to control, tests were performed under cold room conditions using a miniature ice tank. This paper describes the material properties of EG/AD/S and EG/AD model ices, such as flexural strength, compressive strength and elastic modulus. In order to obtain the desired strength and stiffness levels for the model ice, a warm-up process was introduced.

The treatment of sewage using DAF pump system with micro bubble and non-powered flotation tank (응집제 자동혼합형 미세기포 발생장치와 무동력 부상분리조를 이용한 하수의 처리)

  • Kim, Dong-Ha;Lee, Soo-Young;Jung, Eui-Taek
    • Journal of Korean Society of Water and Wastewater
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    • v.25 no.5
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    • pp.659-666
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    • 2011
  • Although DAF(Dissolved Air Flotation) has been successfully accepted for water and wastewater treatment, the fundamental characteristics of the process have not been fully investigated. Water is saturated with compressed air to dissolve the air into the water at high pressure in saturation tank. Then the water containing dissolved air is released into a floatation tank at a lower pressure, generating micro-bubbles that rise gently through the water and carry the suspended matter to the surface. This study investigated the removal of sewage using automatic mixture type DAF pump and non-powered flotation tank. Characteristics of two devices were compared and analyzed with samples. The results showed that the PAC exhibited higher performance than other coagulants. When air dosage was 2.5ml/l/min, treatment was stable in operation. In the DAF pump with a pressure of 4 atm., the average size of bubbles was 36.2${\mu}m$. Removal efficiency of SS was 80%. At this time removal efficiency of COD was about 80%, of T-N was 30% and T-P was 70% in stable operation. It was concluded that DAF pump system with micro bubble performed higher efficiencies compared to general DAF system for treating wastewater.

The Foul Smelling from Sewer Pipe near Large Apartment Complexes and its Countermeasures II: The Cause for Foul Odors of Sewer Pipes in Residential Areas (대규모 아파트 단지주변 하수관로의 악취 발생과 대책 II: 주거지역 하수관로의 악취원인과 대책)

  • Lee, Jang-Hown;Kang, Seon-Hong
    • Journal of Korean Society of Water and Wastewater
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    • v.21 no.5
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    • pp.631-639
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    • 2007
  • This study investigated the construction and operation status of sewer pipes and water-purifier tanks near densely populated areas like large apartment complexes, in order to find out cause for offensive orders. The study results revealed that the main cause arose from the water-purifier tank and public sewer pipes near ordinary residential areas. First, in case of independent water-purifier tanks, the air is forced into the rotten part of large tanks nearby which should be operated in an anaerobic state, so that the tank changes into an aerobic state, or dirty water, which is returned during the sludge return process, falls on the top of the rotten tank, preventing scum from forming within the tank. Such problems cause incompletely purified water in the purifier tank to be discharged, which in turn results in filthy water. Second, in case of public sewer pipes, deteriorated or aging pipes, or the mixture of rain water and dirty water by mixing up combined and separated sewers system can cause foul odors in residential areas. Therefore, offensive odors in residential areas can be radically reduced through the appropriate construction and management of facilities including water-purifier tanks. As well, if more separate sewers are installed as part of an improvement project for public sewer pipes, complaints about foul smell can be minimized.

Construction and Evaluation of Thermal Crack Stability about Bottom Slab of the #219 LNG Underground Tank in Incheon (인천 LNG 지하탱크 #219 Bottom Slab시공 및 온도균열 안정성 평가)

  • Son, Young-Jun;Ha, Jae-Dam;Um, Tai-Sun;Lee, Jong-Ryul;Park, Jong-Sik
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.689-692
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    • 2006
  • The crack of concrete induced by the heat of hydration is a serious problem, particularly in massive concrete structures. In order to control the temperature crack of massive concrete, the selection of appropriate materials like low heat cement, mixture materials, etc. is essential. In tills study, mix proportion using low heat portland cement and lime stone powder was designed and the best mix proportion, B-1, was selected. When bottom slab of the #219 LNG tank in Incheon was constructed, concrete temperature was measured. And thermal stress was analyzed about bottom slab of the LNG tank. As results of the thermal analysis, crack index was 1.60 in bottom slab and satisfied with construction specifications(over 1.0).

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Suggestion of the Analysis Model and Verification on Rotating Flow in Stirred Tanks Using CFD (전산유체역학을 이용한 교반 탱크 내에서의 회전유동에 대한 해석 모델의 제안 및 검증)

  • Hwang, Seung Sik;Yong, Cho Hwan;Choi, Gyuhong;Shin, Dohghoon;Chung, Tae Yong
    • Journal of Energy Engineering
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    • v.22 no.1
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    • pp.28-37
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    • 2013
  • Stirred tank is widely used in various industries for mixing operations and chemical reactions for single- or multi-phase fluid systems. For designing agitator of high performance, quantity data of internal flow characteristics influenced by mixing performance are definitely confirmed but quantity analysis about the transient flow characteristics of complicate structure is recognized as difficult problem in the present. In this study, two models of commercial CFD code Fluent 6.3 used to propose suitable for the tank analysis. Agitation of Stirred tank is analyzed using a mixed model and the flow in the stirred tank is analyzed using a standard k-${\varepsilon}$ model. Multiple reference frame(MRF) and Sliding mesh(SM), the analysis techniques were used For compare a result of CFD with a visualization experiment result, to grasp internal flow and mixing characteristic in stirred tank and to present fundamental analysis method.

Acute toxicity response caused by mixture or tank mix of several insecticides (몇 가지 살충제의 혼용 및 혼합 시 독성반응)

  • Lee, Je-Bong;Jeong, Mi-Hye;Sung, Ha-Jung;Lee, Hae-Keun;Yang, Jae-Sul
    • The Korean Journal of Pesticide Science
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    • v.5 no.4
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    • pp.57-61
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    • 2001
  • Tank mixing application of pesticides has been used to reduce labor and to control wide spectrum of pests, but it may cause significant pesticide poisoning on human and animals due to carelessness. The toxic response of pesticides for the tank mixtures and mixtures was investigated to determine acute toxicity and enzymatic change using experimental animals. Acute oral toxicity and acute dermal toxicity were tested by RDA test guideline. The $LD_{50}$ was calculated by probit analysis method and cholinesterase was measured with automatic analyzer. The toxicities were generally higher than estimated toxicities in tank mixing and mixture. Serum cholinesterase activity was inhibited more than expected at the dose levels of 1/5, 1/10 and 1/20 of $LD_{50}$. Therefore, the results of this study showed that acute toxicity caused by the pesticide mixtures should be considered before the tank mixing method is applied.

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Heat Transfer Characteristics of the Spherical Capsule Storage System Using Paraffins

  • Cho, Keum-Nam;Choi, S. H.
    • International Journal of Air-Conditioning and Refrigeration
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    • v.6
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    • pp.113-123
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    • 1998
  • The present study is to investigate the effect of experimental parameters on the heat transfer characteristics of a spherical capsule storage system using paraffins. N-Tetradecane and mixture of n-Tetradecane 40% and n-Hexadecane 60% were used as paraffins. Water with inorganic material was also tested for the comparison. The experimental parameters were varied for the Reynolds number from 8 to 16 and for the inlet temperature from -7 to 2$^{\circ}C$. Measured local temperatures of spherical capsules in the storage tank were utilized to calculate charging and discharging times, dimensionless thermal storage amount, and the average heat transfer coefficients in the tank. Local charging and discharging times in the storage tank were significantly different. The effect of inlet temperature on charging time was larger than that on discharging time, but the effect of Reynolds number on charging time was smaller than that on discharging time. Charging time of paraffins was faster by 11~72% than that of water with inorganic material, but little difference of discharging time was found among them. The effect of Reynolds number on the dimensionless thermal storage was less during charging process and more during discharging process than the effect of inlet temperature. The effect of the inlet temperature and the Reynolds number on the average heat transfer coefficient of the storage tank was stronger during discharging process than during charging process. The average heat transfer coefficients of the spherical capsule system using paraffins were larger by 40% than those using water.

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