• Journal of Nutrition and Health
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• 제17권4호
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• pp.245-252
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• 1984

이온정전(靜電)이 이유후(離乳後)의 어린생쥐의 성장(成長)에 영향을 미치지 않았으며, ${11.5}g{\sim}{16.2}g$의 생쥐는 이온 처리(處理)에 의하여 약간의 체중증가(體重增加)를 보였으나 통계적(統計的) 유의차(有意差)는 없었다. 또한 먹이의 섭취량(攝取量)에는 영향을 주지 않았다. 이온정전처리구(靜電處理區)와 비처리구(非處理區)를 교체처리한 시험에서 사춘기의 생쥐 체중(體重)은 처음으로 처리한구(區), 이온처리 경험이 있는 생쥐을 처리한구(區), 비처리구(非處理區)의 순(順)으로 감소되었다. 고단백질(高蛋白質)먹이와 고탄수화물(高炭水化物)먹이의 급여(給與)로 인한 체중변화(體重變化)는 보이지 않았으나 이들간에 약간의 차이가 보였다. 이온처리방법간(處理方法間)의 비교시험에서 보통하전법(普通荷電法)이 7시간하전법(時間荷電法)보다 성적이 우수하였다. 임신전(妊娠前)에 이온처리(處理)된 어미생쥐로 부터 출생(出生)된 한배새끼의 수(數)는 처리구(非處理區)보다 현저히 많았으며 새끼의 성장(成長)도 정상적(正常的)이었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.753-755
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• 1988

In this paper, the effective ionization coefficients (${\alpha}-{\eta}$/Po) are measured by the steady state Townsend method in Townsend discharge domain. The effective ionization coefficients are measured in the range 75${\leqq}$E/Po${\leqq}$150(V/Torr. cm) in $SF_{6}$. The values of the effective ionization coefficients are easily and precisely determined by means of the linearization of current growth equation. The effective ionization coefficients of $SF_{6}$ were agreement with that of Bhalla and Craggs.

• 전기학회논문지
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• 제65권12호
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• pp.1971-1978
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• 2016

In this paper, electrical and physical characteristics associated with the ionization growth of soil under impulse voltages in a coaxial cylindrical electrode system to simulate a horizontally-buried ground electrode were experimentally investigated. The results were summarized as follows: Transient ground resistances decreased significantly by soil ionization. The voltage-current (V-I) curves for non-ionization in soil lined up in a straight line with the nearly same slope that is the ground resistance, but they showed a 'cross-closed loop' of ${\infty}$-shape under ionization. The conventional ground resistance and equivalent soil resistivity were inversely proportional to the peak value of injected impulse currents. On the other hand, the equivalent ionization radius and time-lag to the maximum value of ionization radius were increased with increasing the incident impulse voltages. An analysis method for the transient ground resistances of the ground electrode based on the ionization phenomena was proposed. The proposed method can be applied to analyze the transient performances of grounding systems for lightning protection in power system installations.

• 대한전기학회논문지
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• 제34권7호
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• pp.289-296
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• 1985

The Townsend primary ionization coefficient a was measured by the luminous-flux method using the fact that the intensity of radiant light is proportional to electron density in the townsend discharge domain. The ranges of measurements were 15for He gas and 10

• 생물환경조절학회지
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• 제24권1호
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• pp.45-50
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• 2015

새싹은 영양분이 풍부한 식품이다. 하지만 생산 과정에서 종피에 있는 미생물에 의한 오염 가능성이 존재한다. 이 실험의 목적은 음이온 처리가 새싹의 생장과 살균에 미치는 효과를 구명하는 것이다. 음이온 처리는 4종류의 새싹의 생장과 살균효과에 긍정적인 효과를 보였다. 대조구에 비해 음이온 처리한 적양배추와 케일 새싹의 배축길이는 약 1.26배 증가하였으며, 상추, 적양배추, 케일 유근의 길이는 1.4~1.6배 증가하였다. 모든 새싹의 생체중은 음이온 처리했을 때 대조구에 비해 16.0~38.5% 유의적으로 증가하였다. 유근의 활력 또한 음이온 처리가 대조구에 비해 유의적으로 높은 수치를 보였다. 음이온 처리된 상추, 적양배추, 다채 새싹의 일반 세균 수는 대조구에 비해 각각 41%, 66%, 19% 감소하였으며, 배수되는 물의 세균 수 또한 감소되었다. 결국 음이온처리는 새싹의 생장을 향상시켰으며, 동시에 살균하는데도 효과적이었다.

• 한국전기전자재료학회논문지
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• 제14권9호
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• pp.773-778
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• 2001

In this dissertation the results of the combined experimental and theoretical studies designed to understand and predict the spatial growth and transport coefficients for electrons in SF$_{6}$ and SF$_{6}$-Ar mixtures have described. The ionization and attachment coefficients in pure SF$_{6}$ and SF$_{6}$-Ar mixtures have been calculated over the range of 10$_{6}$ molecule and for Ar atom proposed by other authors. The transport coefficients for electrons in (0.2%)SF$_{6}$-Ar and (0.5%)SF$_{6}$-Ar mixtures were measured by time-of-flight method, and the electron energy distribution function and the parameters of the velocity and the diffusion were determined by the variation of the collision cross-sections with energy. The results obtained in this work will provide valuable information on the fundamental haviors of electrons in weakly ionized gases and the role of electron attachment in the choice of better gases and unitary gas dielectrics or electro negative components in dielectric gas mixtures. gas mixtures.

• 한국결정성장학회지
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• 제20권4호
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• pp.159-163
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• 2010

스컬용융법으로 큐빅지르코니아(YSZ) 단결정들($ZrO_2:Y_2O_3:Co_3O_4:CeO_2$=64:36:0.5:0~0.3mol%)을 성장시켜 $N_2$ 분위기 $1200^{\circ}C$에서 3시간 동안 열처리 하였다. 갈색의 단결정들은 각각 녹색 또는 청색으로 변화되었다. 열처리 전 후의 YSZ 단결정들은 직경 7, 두께 2 mm의 웨이퍼 또는 직경 12 mm의 라운드브릴리언트 컷으로 연마 하였다. 각 시편의 광학적 또는 구조적 특성은 UV-VIS 분광광도계와 XRD(X-ray diffraction)로 분석하였으며, $Ce^{3+}(^2F_{5/2},\;_{7/2}(4f){\rightarrow}^2T_g(5d^1))$, $Co^{2+}(^4A_2(^4F){\rightarrow}^4T_1(^4F)$ 또는 $^4T_1(^4P)$) 및 $Co^{3+}$에 의한 흡수, 이온화에너지 및 격자상수 변화를 확인하였다.

• 조명전기설비학회논문지
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• 제29권4호
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• pp.95-101
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• 2015

This paper presents experimental results about characteristics of soil discharge as a function of moisture content when the $1.2/50{\mu}s$ lightning impulse voltage is applied. The laboratory experiments, for this study, were carried out based on factors affecting the transient behavior in soils. The electrical breakdown in soils was measured over a 0-6% range of moisture content for sands and a 0-4% range of moisture content for gravels. Needle-plane electrode systems was used As a result, the conduction current prior to ionization growth in dry soil is a little, but it in wet soil is increased with the applied voltage because the wet soil particles act as conductors. The soil impedance curves show an abrupt reduction just after breakdown. The general tendency measured in different soils is that the higher the water content, the lower the breakdown voltage and the shorter the time-lag to breakdown.

• 천문학회보
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• 제39권2호
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• pp.78.1-78.1
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• 2014

An ionization front (IF) surrounding an H II region is a sharp interface through which a cold neutral gas makes transition to a warm ionized phase by absorbing UV photons from central massive stars. We investigate the structure and instability of a plane-parallel D-type IF threaded by magnetic fields parallel to the front. We find that magnetic fields increase the maximum propagation speed of the IFs, while reducing the expansion factor, defined as the density ratio of neutral to ionized phases. IFs become unstable to distortional perturbations due to gas expansion across the fronts, exactly analogous to the Darrieus-Landau instability of ablation fronts in terrestrial flames. The growth rate of the IF instability is proportional linearly to the perturbation wavenumber as well as the upstream flow speed. The IF instability is stabilized by gas compressibility and becomes completely quenched when the front is D-critical. The instability is also stabilized by magnetic pressure when the perturbations propagate in the direction perpendicular to the fields. When the perturbations propagate in the direction parallel to the fields, on the other hand, it is magnetic tension that reduces the growth rate, completely suppressing the instability when ${\beta}$ < 1.5, with ${\beta}$ denoting the square of the ratio of the sound speed to the Alfven speed in the pre-IF region. When the front experiences an acceleration, the IF instability cooperates with the Rayleigh-Taylor instability to make the front more unstable. We discuss potential effects of IF instability on the evolution and dynamics of IFs in the interstellar medium.

• Mass Spectrometry Letters
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• 제5권1호
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• pp.1-11
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• 2014

Lipids play important roles in biological systems; they store energy, play a structural role in the cell membrane, and are involved in cell growth, signal transduction, and apoptosis. Phospholipids (PLs) in particular have received attention in the medical and lipidomics research fields because of their involvement in human diseases such as diabetes, obesity, atherosclerosis, and many cancers associated with lipid metabolic disorders. Here I review experimental strategies for PL analysis based on nanoflow liquid chromatography-electrospray ionization-tandem mass spectrometry (nLC-ESI-MSn). In particular, discussed are lipid extraction methods, nanoflow LC separation of PLs, effect of ionization modifiers on the ESI of PLs, influence of chain lengths and unsaturation degree of acyl chains of PLs on MS intensity, structural determination of the molecular structure of PLs and their oxidized products, and quantitative profiling of PLs from biological samples such as tissue, urine, and plasma in relation to cancer and coronary artery disease.