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Resistance of Varieties Bred by Crossing with Asominori to Bacterial Leaf Blight (벼 아소미노리 교배조합 품종의 벼흰잎마름병 저항성)

  • 심재성
    • Korean Journal of Plant Resources
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    • v.10 no.2
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    • pp.128-134
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    • 1997
  • This study was conducted to test on the resistance of varieties bred by crossing with Asominori to bacterial leaf blight. Nakdongbyeo and Dongjinbyeo which were susceptible to HB 9011, 8 resistant varieties including Ilmibyeo derived from Asominori and Asominori, Hwangok, 13 varieties including Chukoku 45 which were resistance to HB 9011, HB 9022 and HB 9033 were used to screen their res ponce depending on the various screening methods such as the true resistance, the secondary infection resistance and the disease common field test methods, and the results are as follows: Among 13 varieties tested, 11 varieties including llmibyeo showed tme resistance to HB 9011. Less than 1.0cm of disease lesion were developed on these varieties. Disease lesion was not developed on most of the Asominori lines including Daechongbyeo against IIB9011 and 1lmibyeo was also resistance to HB 9011, on this variety disease lesion area rate was 1.2%, and 7 varieties including Hwajinbyeo showed field resistance to HB 9022. Disease lesion area rate were 19.6% on Nakdongbyeo. 15.6% on Dongjinbyeo, from 3.0% to 2.4% on Asominori lines, and 0.5% on the Asominori when screened at disease common area. Disease was not developed on Keumnambyeo. Significant correlation coefficiences were found between the results from the test methods of the true resistance, the field resistance ancl the field resistance at disease common field tests on Asominori lines, but in some cases, even the varieties on which disease lesions developed, showed field resistance to HB 9022 and HB 9033.

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A Study on Field Applicability Evaluation of the Hydrophobic - Low Viscosity Surface Treatment Material for Pavement Preventive Maintenance (소수성 특성을 이용한 저점도 AP 표면처리재의 현장 적용성 연구)

  • Choi, Jun Seong
    • International Journal of Highway Engineering
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    • v.16 no.1
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    • pp.31-39
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    • 2014
  • PURPOSES : Surface treatment material for pavement preventive maintenance should be inspected field applicability. This study(Part II) aimed to checkup coating characteristics and performance analysis using lab and field tests. The hydrophobic - low viscosity filling material for pavement preventive maintenance is presented in Part I, which is a series of companion study. METHODS : Relative comparison between general asphalt mixtures and surface treatment asphalt mixtures are analyzed and measured for the field application such as indirect tensile strength ratio(TSR), abrasion resistance, crack propagation resistance, temperature resistance, coating thickness, permeability resistance and skid resistance in terms of british pendulum number(BPN). RESULTS : It is found that TSR, crack propagation resistance and permeability resistance is increased as against uncoated asphalt specimen. Abrasion resistance and temperature resistance is secured from the initial coating thickness point of view, which is about 0.2~0.3mm. Skid resistance on the surface treatment pavement is satisfied with the BPN criteria of national highway because of exposed aggregate and crack sill induced pavement deterioration and damage cracks. CONCLUSIONS : The hydrophobic - low viscosity surface treatment material for pavement preventive maintenance is validated on field applicability evaluation based on quantitative analysis of coating thickness and performance analysis using lab and field tests.

An Improved Method for Screening Rice Cultivars with Field Resistance to Bacterial Leaf Blight (벼흰빛잎마름병에 대한 포장 저항성의 새로운 검정법)

  • Choi J. E.;Lee D. K.;Seo J. H.;Bae S. H.
    • Korean Journal Plant Pathology
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    • v.1 no.2
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    • pp.115-121
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    • 1985
  • To improve methods of screening rice cultivars with field resistance to bacterial leaf blight, testing plant inoculation and neighbor plant inoculation were compared by using 33 rice cultivars. In the testing plant inoculation method, field resistance was evaluated by measuring the leaf areas diseased on the new leaves expanded after the inoculation. Varietal differences in field resistance were recognized more clearly by the testing plant inoculation method than by the neighbor plant inoculation method. Highly significant correlation was observed between the results of the two methods. Some rice cultivars such as, Seomjin, Hangangchal, Taebaeg, Samgang, Milyang 42, Asominori, Java 14, Chugoku 45 and 70X-46 showed remarkable field resistance to bacterial leaf blight. The testing plant inoculation method appeared desirable for screening rice cultivars for the qualitative and field resistance to bacterial leaf blight because of using less labor and less field area than neighbor plant inoculation.

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Pullout Resistance Characteristics of the Wedge-shaped Soil Nail (쐐기형 쏘일 네일의 인발 거동 특성)

  • Kim, Bum-Joo;Lee, Yong-Jun;Yoon, Yong-Soo;Chung, Min-Kyu;Yoon, Ji-Nam
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.1079-1083
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    • 2009
  • In this study, the pullout resistance characteristic of a wedge-shaped soil nail, made by attaching small steel sticks to the tip of a nail in a wedge shape, was investigated. It was developed to improve the overall pullout resistance capacity of the existing soil nail system, composed of nail and grout, by making the wedge provide additional pullout resistance. In order to evaluate the pullout resistance of the wedge shape-soil nail, field pullout tests were conducted, and the results were compared with those for the existing soil nail without the wedge. The field test results showed that the pullout resistance capacity of the wedge-shaped soil nail was 50% larger than that of the existing soil nail without the wedge.

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Comparision Analysis of Model Test for Prediction of Uplift Resistance in the Reclaimed Land Greenhouse Foundation (간척지 온실기초 나무말뚝의 인발저항력 예측을 위한 실내모형시험 결과 비교·분석)

  • Song, Chang Seob;Kim, Myeong Hwan;Jang, Ung Hee
    • Journal of The Korean Society of Agricultural Engineers
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    • v.58 no.2
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    • pp.45-52
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    • 2016
  • The object of this paper was to evaulate modified proposed design equation in model test result in order to estimate uplift-resistance of timber pile of reclaimed land greenhouse foundation. Uplift resistance result of model test was increased to according to increased of contact area. Uplift-resistance result of field test tend to lineary increased to according to increased of embedment depth and contact area. Results of field uplift-resistance was evaluate compare with modified proposed design equation results of model test and Effective stress method. As the Effective stress method tend to underestimate, modified proposed design equation results of model test tend to similar type. As the contact area increase, difference between field uplift-resistance results and modified proposed design equation results of model test was considered uplift-speed.

Analysis of Magnetic Field Application Effect on Fault Current Limiting Characteristics of a Flux-lock Type SFCL

  • Lim, Sung-Hun
    • Transactions on Electrical and Electronic Materials
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    • v.9 no.6
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    • pp.255-259
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    • 2008
  • The magnetic field application effect on resistance of a high-$T_c$ superconducting (HTSC) element comprising a flux-lock type superconducting fault current limiter (SFCL) was investigated. The YBCO thin film, which was etched into a meander line using a lithography, was used as a current limiting element of the flux-lock type SFCL. To increase the magnetic field applied into HTSC element, the capacitor was connected in series with a solenoid-type magnetic field coil installed in the third winding of the flux-lock type SFCL. There was no magnetic field application effect on the resistance of HTSC element despite the application of larger magnetic field into the HTSC element when a fault happened. The resistance of HTSC element, on the contrary, started to decrease at the point of four periods from a fault instant although the amplitude of the applied magnetic field increased.

Effect of an External AC Magnetic field on Dynamic Resistance and Loss Characteristic in a Bi-2223 Tape (외부 교류자장이 Bi-2223테이프의 동저항 및 손실특성에 미치는 영향)

  • Ryu, Kyung-Woo;Choi, Byoung-Ju
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.5
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    • pp.473-477
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    • 2005
  • A Bi-2223 tape has been developed for power applications such as a fault current limiter, a power cable and a superconducting magnetic energy storage system. In such applications, the Bi-2223 tape carries time varying transport current and in addition experiences time varying external magnetic field. It is well known that the external magnetic field not only causes magnetization loss in the Bi-2223 tape, but also drastically increases transport loss due to a so-called 'dynamic resistance' We developed an evaluation setup, which can measure transport loss in external at magnetic fields. Using this equipment, we measured the dynamic resistances for various amplitudes and frequencies of an external at magnetic field perpendicular to the face in the tape. Simultaneously we investigated the effect of an external ac field on transport loss with different experimental conditions. This paper describes test results ana discussions on correlation between the dynamic resistance and the transport loss for the Bi-2223 tape.

Protection Resistance Determination for Field Winding in Superconducting Generator (초전도발전기의 계자권선 보호저항 선정에 관한 연구)

  • Kang, Joon-Sun;Nah, Wan-Soo;Kwon, Young-Kil;Sohn, Myoung-Hwan;Ryu, Kang-Sik
    • Proceedings of the KIEE Conference
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    • pp.238-240
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    • 1999
  • In this paper, the protection resistance determination for the field winding in superconducting generator is suggested. To protect the field winding in a generator, they usually use the external resistance to decrease the field current more rapidly when quench occurs in the winding. Since the field winding is actually separated into four sections (magnets), we have choices to insert 1, 2, and 4 external resistances. For each case, the current decay and the voltages across e winding are calculated, and we can choose the best external resistance.

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Magnetic Properties of Oxide Superconducting Material (산화물 초전도체의 자기적 특성)

  • Lee, Sang-Heon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.115-118
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    • 2003
  • The sensor at liquid nitrogen temperature showed the increase of electrical resistance by applying magnetic field. Actually, the voltage drop across the sensor was changed from zero to a value more than $100\;{\mu}V$ by the applied magnetic field. The change of electrical resistance depended on magnetic field. The sensitivity of this sensor was $2.9\;{\Omega}/T$. The sensing limit was about $1.5{\times}10^{-5}\;T$. The increase of electrical resistance by the magnetic field was ascribed to a modification of the Josephson junctions due to the penetrating magnetic flux into the superconducting material. Considering the observed properties of the superconductor with trapped magnetic flux, a magnetic sensor was fabricated to detect simultaneously both the intensity and the direction of the magnetic field.

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Magnetic Characteristics of BiPbSrCaCuO Oxide Superconductor (BPSCCO 자기 효과)

  • Lee, Sangl-Heon;Lee, Sung-Gap;Lee, Young-Hie
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.252-254
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    • 2003
  • A magnetic field sensor is fabricated with superconducting ceramics system. The sensor at liquid nitrogen temperature shows the increase in electrical resistance by applying magnetic field. Actually, the voltage drop across the sensor is changed from zero to a value more than $100{\mu}V$ by the applied magnetic field. The change in electrical resistance depends on magnetic field. The sensitivity of this sensor is 2.9 ohm/T. The increase in electrical resistance by the magnetic field is ascribed to a modification of the Josephson junctions due to the penetrating magnetic flux into the superconducting material.

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