http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
원심펌프 배관계 진동에 영향을 주는 블레이드 가진주파수의 실험적 고찰
김윤제,신호길 한국에너지학회 2001 에너지공학 Vol.10 No.4
펌프에서는 회전차와 케이싱의 간섭에 의해 압력 펄스가 발생하게 되는데, 이러한 압력 펄스가 펌프의 배관계와 공진을 형성하게 되면 큰 진동 및 소음을 일으켜 문제를 야기시킬수 있다. 따라서 본 연구에서는 단단·한쪽흡입형 벌류트 펌프를 대상으로 하여 펌프성능에 영향을 미치는 인자 가운데 회전차 외경과 흡입경을 고정하고, 깃의 입·출구각과 깃 수를 단계적으로 변화시켜 이에 따른 압력펄스의 변화와 배관계와 공진현상 조건을 실험적으로 규명하였는데, 배관계의 진동은 토출량 및 펌프의 회전수보다 배관 및 회전차의 형상에 크게 영향을 받음을 알았다. Pressure pulsations generated by the blade-tongue interaction induce vibration of the piping systems and the structure connected to pumps, resulting in the severe noise and fatigue fracture. Experiments were made on the natural frequencies of liquid columns in piping systems with a single suction, single stage, centrifugal volute pump. Experimental results show that the natural frequencies of the liquid columns in the pump piping systems depend on the dimensions of the pipes and the impeller shapes, and are not affected substantially by the rate of discharge and the rotating speed of the pump.
Ovalbumin으로 유발시킨 喘息에 대한 黃芩의 물 추출물의 효과
황대룡,이성철,신호동,신민교,김재홍,정종길,송호준 대한본초학회 2004 大韓本草學會誌 Vol.19 No.4
Objectives : To evaluate effect of allergy by Radix Scutellariae Water Extract(RS), the biochemical changes associated with allergy were measured in Broncho Alveola Lavage Fluid(BALF), serum, splenocyte and lung of mice. Methods : After induction of allergic inflammation asthma by treatment of Ovalbumine(OVA), RS were taken orally for five successive days on mice, respectively. Results : In the total cell of BALF , the RS(1000mg/kg) treated group was significantly reduced compared to control level, and the reduction of eosinophil showed significantly at concentration of RS(300, 1000 mg/kg). Substantial decrease IgE antibody formation was significantly observed by administration with RS(300, 1000㎎/㎏), whereas IgG1, IgG2a antibody formation was not affected in serum from RS treated mice. The content of IL-4 exhibited physiological role in lung, splenocyte was not significantly reduced compared to control group after treatment of RS, but IL-5 was significantly reduced at concentration of RS (300, 1000㎎/㎏). Conclusions : From the above result, it could be concluded that Radix Scutellariae Water Extract showed beneficial effect on the allergic asthma.
고분해능 전자현미경에 의한 Al-Li-Cu-Mg-Zr 합금의 석출거동
조성길,이신호,황돈하,주승원,이응조 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.9
The precipitation behavior in Al-2.28wt%Li-1.11wt%Cu-0.57wt%Mg-0.18wt%Zr alloy has been studied by using a high resolution electron microscope. In the alloy quenched from 530℃, the Ll₂-type microdomains with a few unit cells and regions having lattice modulation parallel to {100} planes are observed in an atomic resolution image. After an aging at 190℃ for 10min, the discrete δ´-ordered precipitates with 4 to 8㎚ in size are recognized in fcc disordered matrix. In the θ´/δ´complex precipitates, interface boundary on both faces of θ´ plate is atomically flat and coherent with surrounding δ´ phase and an antiphase relation is formed between the δ´ phases on both faces of θ´ plate. Nucleation sites of S´ phase are observed at not only δ´/matrix interface and subgrain boundary, but Cu and Mg clusters. In the β´/δ´ complex precipitates, β´ and δ´ phases are slightly misoriented with respect to each other and a lattice misfit of about 10㎚ width is partially observed in the interface boundary.
Chitosan과 자몽종자추출물을 함유한 항균제제의 식품 미생물 감소효과
정은주 ( Eun Ju Jeong ),박나영 ( La Young Park ),박효진 ( Hyo Jin Park ),하종길 ( Jong Gill Ha ),이신호 ( Shin Ho Lee ) 한국키틴키토산학회 2011 한국키틴키토산학회지 Vol.16 No.2
The mixture of 40% ethyl alcohol, 0.1% chitosan and 100 ppm grapefruit seed extract(ECG solution) showed significant antimicrobial activity against Listeria monocytogenes, Bacillus subtilis, Bacillus cereus, Salmonella typhimurium, Pseudomonas fluorecens, Vibrio parahaemolyticus, Vibrio vulnificus and Shigella sonnei after treated with 30% or above concentration of ECG solution for 3 min at 20 o C. The tested microoganisms except Bacillus spp. were not detected after treated with 80% and 100% ECG solution for 3 min at 20 o C. The viable cell number of raw vegetable sprout decreased about 1.88, 2.08 and 2.30 log cycle compared with control after treated with 50% ECG solution for 1, 5 and 10 minute at 20, respectively. The microbial count of pork reduced about 1.63, 1.86 and 1.86 log cycle compared with control after treated with above mentioned conditon. The viable count of cuttlefish after treated with 50% ECG solution for 1 to 10 minutes reduced about 1 log cycle compared with control but didn`t decrease significantly as increase the treatment time.