• Title/Summary/Keyword: Electrostatics

Search Result 37, Processing Time 0.026 seconds

A Study on Electrostatic Degradation Properties of Silicone Rubber due to Reinforcing Agent (보강제 변화에 따른 실리콘 고무의 정전기 열화 특성에 관한 연구)

  • Lee, Sung Ill
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.28 no.2
    • /
    • pp.120-125
    • /
    • 2015
  • In this study, we have come to the following conclusions regarding to the electrification properties (electrostatic electrification voltage and electrification relaxation time) of electrostatics in the three type of specimen (size: $4cm{\times}4cm{\times}0.103cm$) of silicone rubber which is mixed with the ATH (Aluminium Trihydrate(Al($OH_3$)) of 30 phr, 60 phr, 120 phr as reinforcing filler. The electrification properties of electrostatics were measured for the different mixing ratio of ATH with the applied voltage of DC 10 kV at the temperature range of $10^{\circ}C{\sim}30^{\circ}C$ and humidity range of 60%~80%. When the temperature remained constant, the electrical resistance decreased as the humidity increasing in the range of 60%, 70%, 80%. In contrast, when the humidity remained constant, the electrical resistance increased as the temperature increasing in the range of $10^{\circ}C$, $20^{\circ}C$, $30^{\circ}C$. Regarding these results, may be it is because the absorption of O-H molecule appeared in the silicone specimen. It was confirmed that when the temperature remained constant, the electrification relaxation time decreased as the humidity increased. In contrast, when the humidity remained constant, the electrification relaxation time increased as the temperature increased.

Spray and Depositional Characteristics of Electrostatics Nozzle for Spraying Agricultural Chemicals (정전대전 농약살포용 노즐의 분무 및 부착특성)

  • 강태경;이동현;이채식;김충길;노수영
    • Proceedings of the Korean Society for Agricultural Machinery Conference
    • /
    • 2003.07a
    • /
    • pp.156-161
    • /
    • 2003
  • 농약과 방제기가 개발되면서 적은 노력과 비용으로 넓은 면적의 작물을 병과 해충으로부터 보호할 수 있게 되어 수확량이 대폭 늘어나고 농사도 안정적으로 지을 수 있게 되었다. 이렇게 방제작업이 손쉽게 되었으나 농약을 필요량보다 적게 뿌릴 경우 병해충을 충분히 방제할 수 없고, 많이 뿌릴 경우 비용과 환경오염을 증가시키는 또 다른 문제점에 부닥치게 되었다. 현재 사용되고 있는 방제기로 농약을 살포할 경우 노출된 작물의 잎에서는 농약이 흘러내리는 반면 수관내부에 감추어진 잎이나 병해충이 주로 발생되는 잎 뒷면은 농약 부착이 미흡하다. (중략)

  • PDF

A Study on Electrification Properties of Electrostatics in Silicone Rubber (실리콘 고무의 정전기 대전특성에 관한연구)

  • Lee, Sung-Ill;Kim, Hee-Dae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2010.06a
    • /
    • pp.107-107
    • /
    • 2010
  • IT 산업의 발달과 더불어 카메라, 휴대폰, 노트북, 캠코더 등 전기전자 응용분야에 복합기능성 실리콘 고무 시트가 사용되고 있다. 본 연구에서는 실리콘 고무의 사용시 발생하는 정전기를 방지하기 위해 습도와 온도 변화에 따른 정전기 대전전압을 측정하였다. 카본양의 증가에 따라서 대전전압이 감소하였으며 습도가 증가됨에 따라 정전기 대전량은 감소하였다. 12Phr카본 첨가시 대전과 동시에 완화가 일어남을 확인했다.

  • PDF

Development of Aerosol Model Using Moment Method and Validation by Experiments (모멘트 방법을 이용한 에어로즐 모델의 개발과 실험을 통한 검증)

  • Kim Gyeong-A;Kim Dae-Seong;Park Seong-Hun;Gwon Sun-Park;Lee Gyu-Won
    • Proceedings of the Korea Air Pollution Research Association Conference
    • /
    • 2002.11a
    • /
    • pp.385-386
    • /
    • 2002
  • Many important physical properties of natural or man-made aerosol particles such as light scattering, electrostatics charges, and toxicity, as well as their behavior involving physical processes like diffusion and thermophoresis depend strongly on their size distribution. Important aerosol behavior mechanisms affecting the size distribution of aerosol particles include condensation, deposition, and coagulation. (omitted)

  • PDF

A Study for Development and Characteristics of Electrostatic Eliminator for Charged Particles (대전된 분체의 정전기제거장치 개발 및 특성에 관한 연구)

  • Jung, Yong-Chul;Kim, Joon-Sam;Lee, Dong-Hoon
    • Journal of the Korean Society of Safety
    • /
    • v.21 no.3 s.75
    • /
    • pp.22-30
    • /
    • 2006
  • On this study, we developed the electrostatic eliminator for charged particles in manufacturing process. The characteristics of the electrostatic eliminator were investigated, which is two kinds. The first one is Electrical Corona Discharged Type Ionizer. The second one is Photo Ionizer in using soft X-ray. From the experiment, we have obtained the following results. In case of Electrical Corona Discharged Ionizer, neutralization efficiency of charged particles were approximately saturated to 98% over 6.0kV, but as it is non-explosion proof, can not be used in flammable particle treatment process. While in case of photo Ionizer in using soft X-Ray, neutralization efficiency of charged particles were approximately 95%, and more its structure is explosion proof, could be used in flammable particle treatment process.

The Effect of Interface Activation Substances in Reduction Phenomena of Streaming Electrification for Transformer Oil (변압기유의 유동대전 감소현상에 미치는 계면활성제의 효과)

  • Kim, Yong-Woon;Lee, Duck-Chool;Watanabe, Shigeo
    • Proceedings of the KIEE Conference
    • /
    • 2000.07e
    • /
    • pp.48-51
    • /
    • 2000
  • The purpose of this study is to find the way to reduce the electrostatics by interface activation substances added in the insulating oil with concentration[ppm]. As results, The streaming current, surface tension and viscosity of the samples added nonionic and hermaphrodic substances are decreased but the conductivity is increased at higher point than the 1[ppm](c.m.c.), the other side the same phenomena of the samples added cationic and anionic substances are discovered at the 10[ppm].

  • PDF

The Effect of Nonionic Interface Activation Substances in Reduction Phenomenon of Streaming electrification (유동대전 감소현상에 미치는 비이온성 계면활성제의 효과)

  • Kim, Y.W.;Chung, K.H.;Yoo, K.M.;Yoo, J.H.;Lee, E.H.;Lee, D.C.
    • Proceedings of the KIEE Conference
    • /
    • 1998.07d
    • /
    • pp.1410-1412
    • /
    • 1998
  • The purpose of this study is to find the way to prevent the electrostatics from the interface of liquid and solid by adding interface active substances to the insulating oil with concentration. As results, The streaming current, surface tension, and viscosity decreased and conductivity increased at the higher point than the c.m.c. which resulted from, the adding of the interface active substances.

  • PDF

Theoretical and Experimental Analysis of Back-Gated SOI MOSFETs and Back-Floating NVRAMs

  • Avci, Uygar;Kumar, Arvind;Tiwari, Sandip
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • v.4 no.1
    • /
    • pp.18-26
    • /
    • 2004
  • Back-gated silicon-on-insulator MOSFET -a threshold-voltage adjustable device-employs a constant back-gate potential to terminate source-drain electric fields and to provide carrier confinement in the channel. This suppresses shortchannel effects of nano-scale and of high drain biases, while allowing a means to threshold voltage control. We report here a theoretical analysis of this geometry to identify its natural length scales, and correlate the theoretical results with experimental device measurements. We also analyze experimental electrical characteristics for misaligned back-gate geometries to evaluate the influence on transport behavior from the device electrostatics due to the structure and position of the back-gate. The backgate structure also operates as a floating-gate nonvolatile memory (NVRAM) when the back-gate is floating. We summarize experimental and theoretical results that show the nano-scale scaling advantages of this structure over the traditional front floating-gate NVRAM.

Analysis of Transport Characteristics for FinFET Using Three Dimension Poisson's Equation

  • Jung, Hak-Kee;Han, Ji-Hyeong
    • Journal of information and communication convergence engineering
    • /
    • v.7 no.3
    • /
    • pp.361-365
    • /
    • 2009
  • This paper has been presented the transport characteristics of FinFET using the analytical potential model based on the Poisson's equation in subthreshold and threshold region. The threshold voltage is the most important factor of device design since threshold voltage decides ON/OFF of transistor. We have investigated the variations of threshold voltage and drain induced barrier lowing according to the variation of geometry such as the length, width and thickness of channel. The analytical potential model derived from the three dimensional Poisson's equation has been used since the channel electrostatics under threshold and subthreshold region is governed by the Poisson's equation. The appropriate boundary conditions for source/drain and gates has been also used to solve analytically the three dimensional Poisson's equation. Since the model is validated by comparing with the three dimensional numerical simulation, the subthreshold current is derived from this potential model. The threshold voltage is obtained from calculating the front gate bias when the drain current is $10^{-6}A$.