• 제목/요약/키워드: 440 A

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Flucetosulfuron 수면부상형 입제의 최적화 및 제초효과 (Optimization of self-dispersible floating granule (UG) of flucetosulfuron and its herbicidal performance)

  • 김도순;김태영;이종남;황기환;이용상
    • 농약과학회지
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    • 제10권1호
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    • pp.28-35
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    • 2006
  • Flucetosulfuron 수면부상성 입제의 제형요소 및 효능을 최적화하기위한 일련의 실험을 실시하였다. SPA와 xanthan gum을 혼합하여 입제로 제제한 경우 조립성과 부상성이 우수하여 점착제로 선발하였으며 증량제는 조립성, 부상성 및 붕괴성이 우수한 KCl을 선발하였다. 또한 습윤 및 분산제로는 분산성이 가장 우수한 Surfynol 440을 선발하였다. 입제의 입경은 부상성과 분산성을 고려 1.0 mm로 결정하였다. 본 연구로 선발된 부제를 이용해 조제한 flucetosulfuron 수면부상성 입제를 실내 간이 포장 및 야외 포장에서 제초활성을 평가한 결과 잡초를 처리지점에서 15 m에 다다르는 지점까지 우수하게 방제하였다. 따라서 본 수면부상성 입제 기술은 flucetosulfuron을 비롯한 노동력 절감형 제초제 개발에 사용될 수 있을 것으로 기대된다.

건강인식, 운동욕구, 자기효능감이 당뇨병 환자의 운동빈도에 미치는 영향 (The Effect of Health Perception, Exercise Needs, Self-Efficacy on the Frequency of Exercise among Diabetic Patient)

  • 박금옥;정수경
    • 산업융합연구
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    • 제18권2호
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    • pp.37-44
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    • 2020
  • 본 연구는 당뇨병 환자의 건강인식, 운동욕구, 자기효능감이 운동빈도에 미치는 영향을 파악하기 위해 시행된 서술적 연구이다. 2018년 6월부터 7월에 걸쳐, A광역시에 속한 두 개의 대학병원 내분비내과 외래를 방문한 당뇨병 진단을 환자들 중에서 자발적으로 설문지를 작성할 수 있는 86명의 환자를 대상으로 하였다. 연구결과는 서술적 기술 통계량과 Pearson 상관계수, 단계적 회귀분석을 사용하여 분석하였다. 연구결과 운동빈도는 건강인식(r=..215, p=.043), 자기효능감(r=.440, p<.001)과 유의한 양의 상관관계를 나타내었고 운동욕구(r=.144, p=.304)와는 유의한 상관관계를 나타내지 않았다. 회귀분석을 시행한 결과 운동빈도에 미치는 요인은 자기효능감(β=.440, p<.001)만이 유의한 영향을 미치는 것으로 나타났으며 모형의 설명력은 18.4%(F=20.836, p<.001)로 나타났다. 결론적으로 건강에 대한 긍정적인 인식은 자기효능감과 양의 상관관계가 있으며 자기효능감이 높을수록 운동빈도가 증가하게 된다. 따라서, 당뇨병 환자의 건강인식을 높이는 중재와 자기효능감 강화 교육 프로그램이 개발된다면 당뇨병 환자의 운동빈동, 즉 실질적 운동 자기관리를 증진시키는데 도움이 될 것이다.

초음파나노표면개질기술을 이용한 저널베어링 마찰 및 피로특성 연구 (Frictional and Fatigue Characteristics of Journal Bearings by Ultrasonic Nanocrystal Surface Modification (UNSM))

  • 최갑수;다리스렝 스르멩닥와;이승철;김준형;아마노프 아웨즈한;편영식
    • Tribology and Lubricants
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    • 제31권1호
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    • pp.1-5
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    • 2015
  • In this study, we apply an ultrasonic nanocrystal surface modification (UNSM) technique to radial journal bearings (JBs) and disks made of SUJ2 and SCM440, respectively. We investigate frictional properties of untreated and UNSM-treated specimens using a ball-on-disk tester. We construct the Stribeck curve at the boundary, under mixed and full hydrodynamic lubrication conditions for the specimens using friction data obtained from JB tests. The friction at the boundary lubrication condition and the transition period to mixed lubrication condition on the UNSM-treated specimens is reduced, which improves the service life of JBs. The major effects of this reduction in the three lubrication regimes can be explained in the terms of improved mechanical properties and the presence of micro dimples. Moreover, we estimate the friction and fatigue properties of SCM440 specimens using a ball-on-disk specimen under dry and oil-lubricated conditions. Friction test results reveal that the UNSM-treated specimens show lower friction coefficient than the untreated specimens under both dry and oil-lubricated conditions. We evaluate the fatigue properties of SCM440 specimens by calculating the Hertzian stress with respect to the failure cycles. Fatigue tests results also reveal that the UNSM-treated specimens possess a longer fatigue life than the untreated specimens. The improved properties are effective in increasing the energy efficiency of bearings.

고온 고압하에서 물로 윤활되는 스테인레스 강의 마찰 특성 (Frictional Characteristics of Stainless Steel Lubricated with Pressurized Water at High Temperature)

  • 이재선;김지호;김종인
    • Tribology and Lubricants
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    • 제19권1호
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    • pp.21-25
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    • 2003
  • The 440C stainless steel is used for ball bearings and bevel gears in the control rod drive mechanism for the integral reactor, SMART. The friction characteristics of 400C stainless steel a investigated in sliding motion using the reciprocating tribometer which can simulate the operating conditions of the control rod drive mechanism. Highly purified water is used as lubricant, and the water is heated and pressurized in the autoclave. Friction force on the reciprocating specimens is measured by the load cells and transformed into friction coefficient. It is verified that frictional characteristic of the 440c steel is not drastically changed up to operating temperature and variation of friction coeffcient at operating temperature from room temperature to 160$^{\circ}C$ is within 5%.

Leakage Current Reduction of Ni-MILC Poly-Si TFT Using Chemical Cleaning Method

  • Lee, Kwang-Jin;Kim, Doyeon;Choi, Duck-Kyun;Kim, Woo-Byoung
    • 한국재료학회지
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    • 제28권8호
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    • pp.440-444
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    • 2018
  • An effective cleaning method for Ni removal in Ni-induced lateral crystallization(Ni-MILC) poly-Si TFTs and their electrical properties are investigated. The HCN cleaning method is effective for removal of Ni on the crystallized Si surface, while the nitric acid treatment results decrease by almost two orders of magnitude in the Ni concentration due to effective removal of diffused Ni mainly in the poly-Si grain boundary regions. Using the HCN cleaning method after the nitric acid treatment, re-adsorbed Ni on the Si surfaces is effectively removed by the formation of Ni-cyanide complexions. After the cleaning process, important electrical properties are improved, e.g., the leakage current density from $9.43{\times}10^{-12}$ to $3.43{\times}10^{-12}$ A and the subthreshold swing values from 1.37 to 0.67 mV/dec.

7075Al 합금의 고온소성 및 조직제어에 관한 연구 (A Study on Hot Workability and Microstructural Development of 7075 Al Alloy)

  • 고병철;전정식;이현민;최규창;유연철
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1995년도 춘계학술대회논문집
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    • pp.114-123
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    • 1995
  • Hot workability and microstructural development of 7075Al alloy were studied by hot torsion test. With decling temperature from 440$^{\circ}C$ to 340$^{\circ}C$, and strain rate ranges form 5 ${\times}$10-3/sec to 5 ${\times}$10-1/sec , flow stress and microstructural development were analyzed . The hot resoration mechanism was found to be dynamic recrystalization (DRX) form the analysis of the flow curves and the microstructures. In multistage deformation with decreasing temperature grain refinement was obtained effectively compared to conventional thermomechanical treatment (TMT) process. The strain of the 1st stage deformation at 440$^{\circ}C$ was found to play an important role for the next stage deformation behavior at 380$^{\circ}C$.

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