• 제목/요약/키워드: Addition Test

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Cu-W 전극의 DC Arc 시험에 있어서 Nickel 첨가 영향 (Effect of Nickel addition in DC arc test of Cu-W electrode)

  • 김봉서;정현욱;이희웅
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2003년도 춘계학술대회 논문집 유기절연재료 방전 플라즈마연구회
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    • pp.11-14
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    • 2003
  • Sintered Cu-W has been used for the electrode of GIS for interrupting the abnormal current. In this study the effect of Ni addition in Cu-W electrode was investigated. Cu-W electrodes used contains 0.1~0.2wt% Ni and were conducted the experiments which was attacked by DC arc test (70V-70A) for 300 times periodically. As the contents of Ni in Cu-W electrode increase, the hardness and electrical conductivity were decreased. The weight change ($\Delta$mg) of electrode after DC arc test increased with increasing Ni contents and test times. The hardness and electrical conductivity of electrode after DC arc test were decreased compared with non-arc affected electrode, which was owing to the defects near surface of electrode and degradation by arc heat. It was considered that Cu in the Cu-W electrode was scattered to all directions by arc heat, therefore, the electrodes were damaged and deformed in the surface and cross-section of electrode. It is difficult to estimate directly the characteristics of Cu-W electrode for GIS related with high voltage and current from the results of DC arc test conducted in this study. However, the results of the effect of Ni addition in Cu-W electrode could be applied for the research of electrode for GIS.

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Comparison of Hydrodynamic Coefficients obtained through Implementation of Diverse Methods in Square Tank

  • Kang, Seunghyun;Yoon, Hyeon Kyu
    • 한국항해항만학회지
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    • 제38권1호
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    • pp.11-18
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    • 2014
  • To confirm whether the square tank at Changwon National University (CWNU) can be used for estimation of maneuverability, planar motion mechanism (PMM) test and circular motion (CM) test were performed for various conditions. PMM test can be implemented using an XY carriage and a yaw table in the square tank. However, sometimes test section is insufficient for PMM test owing to low length-breadth ratio of the tank. In addition, the speed of a towing carriage is also quite limited. Therefore, it would be useful if PMM test could be effectively performed diagonally, by establishing coupled control logic to drive three servomotors. In addition, Froude number dependency on the estimated hydrodynamic coefficients was checked. Furthermore, CM tests, which cannot be completed in a conventional linear towing tank, were performed, and its results were compared with the results of PMM test. The results of the PMM tests in the diagonal direction were consistent with the results of the test performed in the direction parallel to the sidewall. However, the results of the CM test were greater than those of the PMM test. This tendency was also observed in the results published at Ulsan University.

전분, 식염 및 알카리 첨가제가 냉면의 기계적 성질에 미치는 영향 (Effects of the Addition of Starch, Salt and Soda Ash on the Mechanical Property of Naengmyon)

  • 권오훈;이철호
    • 한국식품과학회지
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    • 제16권2호
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    • pp.175-178
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    • 1984
  • 냉면 국수를 제조함에 있어 전분과 밀가루의 혼합비와 식염 및 알카리 첨가제의 첨가량에 따른 국수발의 기계적 성질의 변화를 creep test로 측정하였다. Creep test의 초기 변형율을 정확히 측정하기 위하여 VTR시스템으로 사진을 찍어 분석하였다. 국수발의 creep 커브는 Burgers의 4-element모델로 분석될 수 있었다. 반죽에 전분의 비율의 높아질수록 삶은 국수발의 순간 탄성치와 뉴우턴 점성치는 감소 하였다. 90% 전분을 포함한 반죽에 식염을 가할 경우 식염농도 4 % 수준까지는 순간탄성이 감소하였다. 알카리 첨가제 첨가시 국수발의 순간탄성, 지연탄성, 지연시간 및 뉴우턴 점성치들이 불규칙하게 변하였으며 그 효과를 일관성 있게 나타낼 수 없었다.

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방탄헬멧의 방탄시험방법 개선에 관한 연구 (A Study on Improvement of Ballistic Testing Method for Combat Helmet)

  • 구승환;김경민;박중화;송승환
    • 품질경영학회지
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    • 제47권2호
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    • pp.283-294
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    • 2019
  • Purpose: Although the development of bulletproof helmets continues to be carried out, little has been improved in testing methods. Therefore, in this study, we studied the improvement of the test method of the domestic bulletproof helmet. Methods: The causes of head damage in the battlefield and the trends of bulletproof helmet development in developed countries were analyzed. In addition, improvements were derived by comparing the test methods of bulletproof helmet in Korea and the United States. Results: The results of the improvement by comparing the test methods of bulletproof helmet in Korea and the United States are as follows First, it is an addition to the scope of environmental treatment. Second, it is an addition to the level of protection. Third, the addition of the level of protection by impact. Conclusion: This study considered testing methods to prevent head injuries to shocks that cannot be identified by conventional methods. In addition, it considered testing methods for various threats by improving protection performance to advanced countries' levels.

블루베리 분말을 첨가한 증편의 품질특성 (Quality Characteristics of Jeungpyun added with Blueberry Powder)

  • 이금옥;김기쁨
    • 한국조리학회지
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    • 제24권1호
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    • pp.96-104
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    • 2018
  • The purpose of this study was to promote consumption of rice through production of jeungpyun added with blueberry attracting attention as a functional food material and to develop a functional blueberry supplement suited to the preference of Westernized consumers. For that pupose, we performed physicochemical quality test and sensory test after preparing the jeungpyun added with blueberry powder based on a ratio of 1%, 2%, 3%, and 4% of rice flour. The results of this experiment can be summarized as follows. When the addition of blueberry powder increased, the moisture content in jeungpyun decreased, but there was no significant difference between the samples. The lightness and the yellowness related to chromaticity decreased and redness increased when the addition of blueberry powder increased. The pH of the dough in jeungpyun increased significantly (p<0.001) when addition of blueberry powder increased. As the fermentation progressed, the pH tended to decline. The volume of dough decreased when addition of blueberry powder increased. The volume was the highest after the first fermentation, and decreased after the second fermentation. Viscosity decreased significantly as the addition of blueberry powder increased, and increased as fermentation time increased, and decreased after the third fermentation. A test was conducted to determine difference in characteristics, and the results showed that the color intensity, cell uniformity, blueberry flavor and sweetness were strong when the addition of blueberry powder increased. The results of preference test showed that JB3 containing 3% blueberry powder had the best appearance, flavor and overall acceptance.

고지재생연구(제14조) -고온압착건조처리 골판지 원지의 강도에 미치는 양성 PAM과 미세분의 영향- (Recycling of Wastepaper(XIV) -The Effect of Amphoteric PAM and Fines on the Dry Strength Properties of Condebelt Press Dried Linerboards-)

  • 최병수;윤혜정;류정용;신종호;송봉근
    • 펄프종이기술
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    • 제33권2호
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    • pp.24-31
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    • 2001
  • As a novel method to improve strength properties of recycled test liner, Condebelt press drying system was introduced and adopted into Korea. New press drying treatment could enhance the surface and strength properties in accordance with the increase of sheet density. However, Condebelt drying can not increase the density of repeatedly recycled test liner as much as that of virgin UKP and at the same density condition, the strength of Condebelt press dried UKP is greater than that of press dried test liner. In order to increase the strength of test liner, two attempts were tried in this study. First, addition of polyelectrolytes, dry strength agent was investigated with a view to promote the fiber bonding potential of reclaimed corrugated container pulp. Second, blending effect of fines were analyzed in an aims of increasing density and strength of test liner. The results were as follows; Even in the case of test liner densified by Condebelt press dryer, addition of amphoteric PAM as a dry strength agent was effective in increasing strength properties and so the effect of dry strength agent on improving bonding potential of recycled OCC fiber could be confirmed. As an appropriate addition level of amphoteric PAM, below 1% based on dry pulp weight was suggested. Different from virgin UKP, density of recycled test liner can be increased by the blending of OCC fines and strength properties also can be improved. However, excessive blending of OCC fines could result in decreasing of density and serious weakening of test liner. The best blending ration of fines in test liner can be determined as about 30%. Taking into account the fines content in general OCC pulp as 50%, excessive 20% of fines were supposed to be fractionated and removed in order to achieve the best strength of Condebelt press dried test liner.

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홍삼분말을 활용한 다식제조에 관한 연구 (The Effect of Red Ginseng Powder on Quality of Dasik)

  • 윤근영;김명애
    • 한국식생활문화학회지
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    • 제21권3호
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    • pp.325-329
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    • 2006
  • This study was to investigate the effect of the addition of red ginseng powder in Dasik. The addition of red ginseng powder in Dasik that we used with was in the ratio of 0%, 2%, 4%, 6% and 8% of red ginseng powder to Dasik in weight. Also, we used two different kinds of Dasik. One was made of starch and the other was made of flour. The physic-chemical analysis and sensory test were performed on the Dasik. The red ginseng powder added flour and starch Dasik showed lower moisture content and higher ash content compared with the non-added control group. In color analysis, whereas L value lowed at the addition of red ginseng powder, a and b value increased at the addition of red ginseng powder. In mechanical texture test, addition of red ginseng powder starch Dasik showed high hardness, cohesiveness and brittleness. Addition of red ginseng powder flour Dasik showed high springiness and gumminess. In the sensory test, the addition of the red ginseng powder reduced the sweetness and increased the surface color and the flavor. There was no difference in preference between the Dasik with up to 4% of red ginseng powder added and the control group, but the Dasik with 6% or more red ginseng was found undesirable (p<0.05). In conclusion, the Dasik with up to 4% addition of red ginseng powder would be the useful method to fulfill the traditional quality of Dasik. It was also found that the flour Dasik was to be more preferable than the starch Dasik.

현장 중온 재생 혼합물용 재생첨가제의 기초적인 연구 (A Fundamental Study of Rejuvenator for Warm in Place Recycling Asphalt Pavement Mixtures)

  • 박재영;이강훈;권수안;이재준
    • 한국도로학회논문집
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    • 제19권5호
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    • pp.13-20
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    • 2017
  • PURPOSES : This research was a laboratory study for evaluating the Reclaimed Asphalt Pavement (RAP) mixture added developed rejuvenator for warm mix recycling. Waste asphalt mixtures occupy about 18.2% of construction wastes in Korea. Moreover, most rejuvenators were imported from Europe or the U.S. Therefore, improving usage of RAP with a developed rejuvenator material provides environmental protection at a reduced cost. METHODS : The specimen used for this experiment was performed by only using RAP. A suitable rejuvenator for Target PG was then added. In addition, a conventional rejuvenator was selected to compare performance and specimens introduced with the same procedure as the developed rejuvenator was prepared. In order to evaluate rutting resistance and water susceptibility, we conducted a deformation strength test, a tensile strength ratio test, and a dynamic immersion test with the prepared mixtures. RESULTS :Laboratory test results indicated that both the developed additive and conventional additive improved performance of the recycled asphalt mixtures compared to mixtures without the rejuvenator. In addition, the deformation strength test and TSR test results satisfied standards for domestic recycling asphalt mixtures. The dynamic immersion test showed that the developed rejuvenator has superior scaling resistance than the conventional rejuvenator. CONCLUSIONS : In terms of rutting resistance and moisture susceptibility, the warm mix recycled asphalt mixtures with the developed rejuvenator appeared to effectively recovered performance.

금속 Al분말 첨가 Castable 내화물의 특성 (Properties of Castable REfractories Containing Metallic Al Powder)

  • 김효준;김인술;이상완
    • 한국세라믹학회지
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    • 제27권7호
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    • pp.877-882
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    • 1990
  • Effects of metallic Al powder addition on basic and thermal properties of castable refractories were investigated. Generally, low grade prooperties were obtained by metallic Al powder addition with the increase of temperature, comparing with those of non-addition of Al powder. Especially, Al addtion showed severe shrinkage, corrosiion and low strength above 1000$^{\circ}C$. As a result of Al addition, lower strength of and higher corrosion resistance were shown for 2% addition, but it was reversed for above 4% addition. It was found that Al addition was excellent in the explosive spalling test regardless of Al quantity.

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Effect Mo Addition on Corrosion Property and Sulfide Stress Cracking Susceptibility of High Strength Low Alloy Steels

  • Lee, Woo Yong;Koh, Seong Ung;Kim, Kyoo Young
    • Corrosion Science and Technology
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    • 제4권2호
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    • pp.39-44
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    • 2005
  • The purpose of this work is to understand the effect of Mo addition on SSC susceptibility of high strength low alloy steels in terms of microstructure and corrosion property. Materials used in this study are high strength low alloy (HSLA) steels with carbon content of 0.04wt% and Mo content varying from 0.1 to 0.3wt%. The corrosion property of steels was evaluated by immersion test in NACE-TM01-77 solution A and by analyzing the growth behavior of surface corrosion products. SSC resistance of steels was evaluated using constant load test. Electrochemical test was performed to investigate initial corrosion rate. Addition of Mo increased corrosion rate of steels by enhancing the porosity of surface corrosion products. However, corrosion rate was not directly related to SSC susceptibility of steels.