講演番号

title

10aA-1

Emission Spectroscopy of Sliding *Department of Ecological Engineering, ○Satoshi SATO*,
Selectivity and energy efficiency of plasma chemical processes can be significantly improved if
Discharge inside Quartz Capillary Toyohashi University of Technology
Karol HENSEL**,
plasma is combined with a catalyst. The generation of stable discharge plasma inside the narrow
Tubes at Atmospheric Pressure **Faculty of Mathematics, Physics and Hiroki
capillaries of automobile catalytic honeycomb is, however, quite difficult. The paper present a novel
Informatics, Comenius University
YAMAUCHI*,Kazunori method, which utilizes the combination of packed-bed discharge, connected in series with the
TAKASHIMA* andhoneycomb capillaries. By the application of dc voltage across the capillaries, the packed-bed
Akira MIZUNO*
discharge can be extended inside the capillaries and form so-called sliding discharge. The paper
presents electrical and optical characteristics of the sliding discharge generated inside a bundle ofquartz capillaries. The effects of discharge voltage and power, gas mixture composition andcapillary diameter on the emission spectra of the discharge are presented.
Characteristics of Negative
Department of Electrical and Electronic ○Hiroshi Muto,
Nonthermal discharge induced plasmas are studied by using various discharges for air pollution
Spread Corona Discharge inEngineering, Oita University
Toshiaki Kudo, Syuichi control. We have been mainly studied by using DC positive streamer coronas for NOx treatment.
Needle-to-Plate Electrode
Akamine, Toshikazu
However, negative corona are mainly used for particle charging but not for air pollution control
SystemOhkubobecause of narrow ionization region compared to positive streamer corona. In this paper, DC
negative coronas are studied by using sharp discharging electrodes in needle-to-plate electrodesystem. We observed widely spread negative corona extending from discharging electrode to plateelectrode, named "negative spread corona discharge". The corona discharge characteristics,
morphology and ozone generation characteristics of DC negative spread corona discharge arestudied compared to negative glow corona and positive streamer corona.
ICCD Camera Imaging of* Faculty of Mathematics, Physics and 〇Karol HENSEL *Imaging of microdischarges inside porous ceramics generated by ac high voltage by means ofMicrodischarges in Porous
Informatics, Comenius University,and Pierre
intensified CCD camera at various time scales and sensitivity was performed. The images ofCeramics
Bratislava, Slovakia ** Laboratoire de TARDIVEAU **discharge light emission were synchronized with the signal of the applied voltage. The light
Physique des Gaz et des Plasmas,
emission of both microdischarges inside the ceramics and a barrier discharge on the surface was
Université Paris Sud, Orsay, France
recorded. The difference between the microdischarges in 10 and 80 μm pore size ceramics was
Observation of Metastable N2(A) The Univesity of Tokyo
Chihiro Toubaru
It becomes severer these days to regulate the hazardous air pollutants, such as volatile organicin Atmospheric Pressure
Ryo Ono Tetsuji Oda compounds (VOC) and nitrogen oxide (NOx). Non-thermal plasma is a very effective method todecompose the pollutant gas. However, there are a lot of unknown factors for reaction process of
non-thermal plasma. In this study, we focused on metastable which is an excitation state ofnitrogen molecule .It is thought that has a significant influence on various reactions in nonthermal plasma. To study the dynamics of metastable, we observed in atmospheric pressure
corona discharge using laser induced fluorescence (LIF).
Observation of Atmospheric* Department of Electrical and
Seiji Kanazawa*,
The characteristics of pulsed corona streamers in air were investigated in the needle-to-plane
Pressure Streamer Discharge
Electronic Engineering, Oita University Shoichi Sato*,
electrode configuration with electrode gap of 10 mm． In the pulsed power circuit，MOS-FETGenerated by Pulsed Power** Institute of Fluid Flow Machinery,
Yoshifumi Ohtsu*
switch was used as a semiconductor closing switch. Time resolved streamer images were recorded
Supply Using a Semiconductor
Polish Academy of Sciences
Marek Kocik**，Jerzy using an ICCD camera. As the pulsed corona discharge generated in this study was relatively
SwitchMizeraczyk**，modest in terms of the discharge power, the streamer features such as streamer number, diameterand branching were similar to the DC corona streamers. The averaged velocity of the streamer
head propagation is about 0.3mm/ns, which is in agreement with our results for the DC corona
National Institute of Advanced
Koichi Mizuno
Industrial Science and Technology

10aA-2

10aA-3

10aA-4

10aA-5

10pS-1
10pB-1affiliation

Analysis of radical generation and ○*Tohoku Univ., **Tohoku Univ.
transportation for dielectric(Presently, Toshiba)，***Wavefront,
barrier discharge in tube and its ****Toyo Advanced Technologies
sterilization efficacy

name○*Takehiko Sato,**Osamu Furuya,***Kei Ikeda,****Tatsuyuki
Nakataniabstract

A dielectric barrier discharge (DBD) in a tube has been developed for catheter sterilization. We
investigated sterilization efficacy against Geobacillus stearothermophilus in a polyvinyl chloride
tube of 3 mm in diameter and 100 mm in length and radical generation and transportation
mechanisms in the tube. For improvement of the performance of sterilization in a tube, we also
analyzed the discharge processes such as electron avalanche and streamer propagation, andclarified the time evolution of the chemical species concentration and the spatial distribution of
the electron number density and temperature.

10pB-2

Generation of a sliding discharge Toyohashi University of Technology
in honeycomb catalyst Characteristics of the discharge
in a bundle of glass capillaries-

10pB-3

Screening of Catalysts for theDecomposition of VOCs Using
Cycled System

10pB-4Oxidation of xylene in air using
Saitama Institute of Technology. *,TiO2 and metal loaded TiO2under Japan Atomic Energy Agency. **electron beam irradiation

10pB-5

Decomposition of xylene in air by *Japan Atomic Energy Agency,:〇Teruyuki
Oxidation of xylene and its irradiation byproducts in air using γ-Al2O3 pellets was studied underelectron beam irradiation using g- **Saitama Institute of Technology,
HAKODA*, Kanae
electron beam (EB) irradiation for purification of ventilation gases exhausted from painting
Al2O3***Toyohashi University of Technology MATSUMOTO**,factories. EB irradiation experiments were performed mainly under the two different conditions:
Akira MIZUMO*** and Al2O3 pellet layer
Koichiwas placed in an irradiation or a non-irradiation space. The results showed that CO was formed in
HIROTA*the gas phase of the irradiation space regardlessof the presence of the Al2O3 pellets, while CO2 was produced both on the surface of those pellets
and in the irradiation gas space. The total concentration of CO2 that was produced on the Al2O3
Roles of Ozone and Catalyst in a National Institute of Advanced
Keiichi Saito＊,＊＊, It was known that the decomposition efficiency of VOCs using a nonthermal plasma method was
Hybrid Plasma Reactor on
Industrial Science andAtsushi Ogata＊,
enhanced by combining with a catalyst in single stage, in which the catalyst was directly exposed
Toluene Decomposition
Technology(AIST)*, Saitama institute Hyun-Ha Kim＊,to the plasma. In the single-stage reactor, not only the decomposition of VOCs but also theof technology**, Kyushu University*** Shigeru Futamura＊, generation of ozone occurred. We investigated the roles of ozone and an ozonolysis catalyst in a
Hirofumi Aritani＊＊, single-stage method and a two-stage method, i.e., the catalysis followed by an ozone generator, on
and Einaga Hisahiro＊ the decomposition of toluene. Actually, ozone assisted catalysis was observed on both the＊＊methods, although its contribution in the single-stage reactor was not so much in the total
conversion of toluene. On the basis of energy efficiency and product-analysis, we concluded thatthe two-stage method was preferable to the single-stage method in this case.
Integral Decomposition of
School of Engineering, The University Hikaru KURAMOCHI Dilute TCE(trichloroethylene) decomposition in a dielectric barrier discharge reactor combined with
Trichloroethylene by theof Tokyo
Tetsuji ODA Ryo
catalyst was investigated. Four types of the plasma process concerning with the catalyst were
Nonthermal Plasma combined
ONO
compared.In this experiment, the plasma process where the catalyst settled at the down flow ofwith Manganese-dioxide
the reactor (named as Outer Catalyst in the paper) was suggested to be superior to Inner Catalyst
supported Alumina.
process (catalyst in the plasma reactor) slightly. At the point of electric discharge power, Inner
Catalyst process was inferior to Outer Catalyst porcess.

10pB-6

10pB-7National Institute of Advanced
Industrial Science and Technology(AIST)○Hiroki YAMAUCHI， In order to improve catalytic activity at low temperatures, combination of plasma and catalyst is
Satoshi SATO，
effective. A honeycomb discharge can be generated using a packed bed discharge at one side of a
Kazunori TAKASHIMA, honeycomb, and a dc electrode at the other end. Basic characteristic of the honeycomb
Akira MIZUNO
discharge has been examined using a bundle of glass capillaries in this study. Packed bed plasma
reactor was connected to the bundle of fine glass capillaries. The bed was filled with 3 mmdiameter pellets of gamma alumina, and ac voltage was applied to generate a packed bed discharge.
With an adequate dc electric field along the capillary tubes, discharge was generated inside thecapillaries. The onset and spark voltage were measured to obtain a stable operating condition.
○Hyun-Ha Kim,
In this work, various catalysts were tested for the decomposition of VOCs using the cycled
Atsushi Ogata, andsystem. The potentials of the tested catalyst were evaluated based on the enhancement factor
Shigeru Futamura(EF) and adsorption capability. The tested catalysts include TiO2, ?-Al2O3, zeolites and several
types of metal catalysts (Pt, Pd, Ag, Au, Mn, W) with different loading amount. Although there isdifference in degree of the enhancement, all catalysts tested in this study showed positive EF
values. The oxygen content-dependence of VOC decomposition efficiency were not observed withthe conventional thermal catalyst reaction and the nonthermal plasma alone.
○KanaeOxidation of xylene and its byproducts in air using TiO2 and metal loaded TiO2 were studied under
MATSUMOTO*,
electron beam (EB) irradiation for purification of ventilation gases exhausted from painting
Teruyuki HAKODA**, factories. EB irradiation experiments were performed mainly under two different conditions: One is
Koichi HIROTA**, and the condition, where the layer of TiO2 and metal loaded TiO2 pellets were placed in an irradiation.
Tadashi NARITA*
The layer of TiO2 and metal loaded TiO2 pellets were placed in a non- irradiation space under theother condition. The results showed that xylene was decomposed and CO was formed in the gas
phase of the irradiation space, while CO2 was produced in the gas phase of the irradiation spaceand on the surface of the TiO2 and metal loaded TiO2 pellets. The total concentration of CO2
became higher, when the pellet layer was in the vicinity of an irradiation space. Chemical reactions
on the surface of the catalysts were also studied by comparing the concentrations of xylene andCOx using the catalysts and non-catalyst pellets.

10aB-1

10aB-210aB-310aB-4

10aB-5

10pC-1High Speed Neutralization utilizing University of Industrial Technology
of Photon Air Ionizer for LCD
Manufacture○Ryuta YOSHINO ,Kazuo OKANO

A soft X-ray air ionizer is widely used for static control in manufacturing process of electronic
device such as LCD because of the contamination free. Unwanted residual space charge
distributes above the charged substrate to recombine with wanted charge and reduce the static
elimination speed in the eliminating process. The grounded grid located between the soft X raysource and the charged substrate was proposed to absorb the residual charge and increase theelimination speed. It was found that the grid play an important role to increase the static
elimination speed. The distribution of the charged particle and the neutralizing current wereSensing System for Measuring
University of Industrial Technology○Yuji TSUCHIYA ,The corona discharge air ionizer is one of the most important equipment for controlling
EMI generated from AC Corona
Kazuo OKANO
electrostatic charges in the manufacture of electronic circuits on printed-circuit boards (PCB).
Discharge Air Ionizer
However, the electromagnetic interference (EMI) of the corona discharge air ionizer often canmake brakedown in the semiconductor devices. The electric field sensor was designed, made, andevaluated for measuring the electric field distribution on the PCB. The uniformity of the electricfield distribution on the PCB decreased with decreasing the distance between the air ionizer andStatic Elimination Characteristics Ibaraki University 1,University of○Masafumi
The A soft X-ray air ionizer is a promising candidate as a static eliminator used in a semiconductorof Soft X-ray Air Jet Ionizer with Industrial Technology 2
SAKUYAMA 1,
manufacturing process because the ionizer generates ions without contaminations. However, ionsControl Grid
Manabu TAKEUCHI 1, have to be generated in the shielded region and be transported to the charged body. The particles
kyosuke TOKUHIRO 2, charged in positive and negative would recombine each other in the transport process to reduce
Kazuo OKANO 2
the density of the charged particle. As a result, the static eliminating speed decreases withincreasing transport time. We propose the soft X-ray air jet ionizer with a control grid to increase
the eliminating speed. The speed of the air ionizer was measured as a function of the operating
condition such as the position of the control grid, the voltage applied to the control grid, and theairflow velocity. The eliminating speed of the soft X-ray air jet ionizer with the control grid wasdepended strongly upon the operating condition, and showed 8 times higher than that of the nonAn ion balance performance inMidori Anzen Co., Ltd.
○TomonoriHigh performance of neutralization is required in the microelectronics industry. Especially in the ion
the polarity change method
TSUMORI, Naokibalance performance the surface voltage is expected to keep the extremely low level. The
SUGITA
comparison between the conventional AC or DC type of the ionizer and a novel type of ionizer
which has been developed to improve the ion balance in space and time by using the polarity
change system is discussed. The polarity of two pairs of the needle electrodes is changed in acertain period, so the dual charge are present in every moment, and high performance on the ion
Electrostatic nozzleless＊Department of Chemical and○Naomasa OHKUBO Recently, the fine particles are used in various application in the field of food industry,
atomization in liquid-liquid phase Environment Engineering, Gunma＊, Takayuki
pharmaceutical industry, cosmetics industry, and printing industry. The electrostatic atomization
University
OHSHIMA＊,
has one of the promising protocol for the production of fine particles. Though the metal nozzle has＊＊College of Indust., Nihon University Masayuki SATO＊,
been used essentially as the high-voltage electrode, we studied the electrostatic nozzleless
and Tomoo NAKANE atomization with membrane filter immersed in kerosene as the continuous phase. 30 wt% of water＊＊glass was fed through the membrane filter, and dispersed into the continuous phase. The
production state of the particle was classified three regions depending on the applied voltage. The
silica particle size was depended on the concentration of span80 used as the surfactant dissolvedin the continuous phase. When span80 concentration was 2 wt%, fine submicron particles were
produced successfully.
Shielding of Drifting Charged
Droplets by Conducting Net forCompliance with Positive List
System○Ryo NISHIMURA,
Katsumi NISHIMORI,
Naganori ISHIHARA

Tottori Univ.

On May 29, 2006 the Ministry of Health, Labour and Welfare introduced the positive list system for
agricultural chemicals remaining in foods. The system prohibits the distribution of foods that
contain agricultural chemicals, such as pesticides, above a certain level if maximum residue limits
have not been established. Because of this, pesticides should be sprayed only on the target
plants. Also, the drifting pesticide particles should be shielded not to reach the other plants. In
this paper, we show that drifting charged water droplets can be shielded by grounded wire netting.
This means that the electrostatic pesticide spraying is effective to prevent drift hazard ofpesticides as well as to decrease in the usage of pesticides.

10pC-2

Charging Mechanism of Coating
Powders in Corona Charging
Spray Gun

10pC-3

A Discussion on Evaluation ofTransfer Efficiency in the
Atomized Electrostatic Powder
Coating System

10pC-4

Analysis of pulsating electric
signals generated in gas-solids
pipe flow

10pC-5Preparation of All Solid
Department of Electrical and Electronic ○Yuki Torii, Yoshihiro All solid electrochromic device which consists of ITO, WO3 electrochromic thin film, solidElectrochromic Device by Pulsed Engineering, Oita University*, Toppan Kubo, Hiroki Tanaka, * electrolytes is investigated for the application of electrochromic display device. All solid
Laser Deposition and its
Forms Co., LTD.
Takaaki Bando,
Electrochromic display device has excellent characteristics such as memory effect, easy to read,
Application
Syuichi Akamine,no angle dependence, low power consumption. ITO, WO3 electrochromic thin film, solid electrolyte
Toshikazu Ohkubo
thin film LiMn2O4 are prepared by pulsed laser deposition (PLD) method at room temperature as afunction of Oxygen pressure. In this paper, both transmittances of LixWO3-x electrochromic thinfilw and solid electrolyte thin film LiMn2O4 and electrochromic effect of all solid chromic device
are studied. For longer spacing between target and substrate, wide uniform thin film can be
Influence of Phthalocyanine
Faculty of Education, Chiba University ○Yoshiaki Yamano
Tree initiation voltages were measured under ac voltage application using samples of epoxy resin
Compound upon Tree Initiation inand Masaaki IIzuka
added with additives. The additives used were five kinds of phthalocyanine and anthracene. Each of
Epoxy Resinthe five phthalocyanines has a different core metal molecule. The experiments revealed that thetree initiation voltage depends upon the kind of the core metal in phthalocyanine. The
phthalocyanines with Ni, Mg and Cu are effective in an increase in the tree initiation voltages. The
highest initiation voltage is obtained in phthalocyanine with Cu, which is about 2 times higher thanthat of the sample without additive. The initiation voltages are not significantly increased by theaddition of the phthalocyanines with Fe and without core metal. Although, as shown in the previous
study, an addition of anthracene in low density polyethylene is remarkably effective in the increasein tree initiation voltage, the addition in epoxy is not as effective as that in the polyethylene. It was

10pC-6

Department of Electrical and Electronic ○Ken'ichi Kanai,Engineering, Ibaraki University
Manabu Takeuchi

In order to study the charging mechanism of coating powders in a corona charging spray gun,charge to mass ratio Q/M was measured as a function of distance from a corona charging spraygun. The amount of free ions collected in a Faraday cage was also measured. An epoxy coating
powder, the mean particle size of which was 16mm, was used in this study. The Q/M of the epoxy
powder increased with an increase in distance from the corona charging spray gun. This resultmeans that although the powder charges in the corona charging spray gun, but the Q/M of thepowder increases further after leaving the spray gun. Acoustic air vibration was given into thespace between the spray gun and the work to disturb the motion of free ions. The frequency ofthe vibration and the level were changed from 10Hz to 200Hz and from 76dB to 90dB, respectively.
It was confirmed that the Q/M of powder was increased by the acoustic vibration of air.
*1 Zao Electrostatic System
Mitsuru MATSUI*1,
This paper describes a discussion on evaluation of the transfer efficiency in the atomized
Laboratory, *2 Top Industries, Co., *3 I. Takashi
electrostatic powder coating (APC) system. For most of the conventional coating systems, theP. D., Inc., Mitsuru MATSUI*1, Takashi TAKAHASHI*2 andconveying air of 80 l/min has been recommended as an empirical standard value, because faster
TAKAHASHI*2 and Tsutomu ITO*3
Tsutomu ITO*3
conveying air not only blows off the powder particles deposited on the surface of object, but also
decreases the transfer efficiency. Usually, in actual coating lines, the transfer efficiency isevaluated using a simplified method, in which only two or three test pieces are coated. In suchtests, the difference in the amount of powder deposited on the test pieces, being dependent on
the testing conditions, is not obtained frequently due to wrap-around and fringe effect. In thispaper, measurement of the coating thickness is proposed for testing the transfer efficiency. Withan experimental investigation using the APC system, about 13% of the increase in coating
thickness was derived, when the amount of the conveying air was increased from 80 l/min to 120
Department of Chemical Engineering, 〇Shuji MATSUSAKA, In gas-solids pipe flow, particles are electrostatically charged as a result of repeated impacts on
Kyoto University
Hiroshi. FUKUD,
the inner walls. When a section of the pipe made of metal is electrically isolated and the charge
Yoshiro. SAKURA and leakage to the ground is monitored, pulsating electric signals are detected. In the present work,
Hiroaki MASUDA
these signals have been studied both experimentally and theoretically. Micrometer-sized alumina
particles were dispersed through an ejector and continuously transported in dilute phase. The
pipes used were 6 mm in inner diameter, and a pre-charging pipe and detection pipes were
installed in the particle transport system. The pulsating electric signals were found to vary in awide range from positive to negative. The variation of the electric signals was attributed to twoelectrostatic phenomena, (i) the induced current caused by the transport of a cloud of charged
particles, and (ii) the particle charging caused by repeated impacts on the inner wall. Based on

10pC-7

Investigation of Lighting damage
for wind power generation

National Institute of Science andKuniko URASHIMA
Technology Policy (NISTEP)
Ministry of Education, Culture, Sports,
Science and Technology (MEXT)

10aA-6

LIF Measurement of OH Radical
Density and Temperature in
Hydrogen-Air Mixture Spark
Electrostatic neutralization ofmultilayer-loading silicon wafers
by corona discharge ionizer

School of Engineering, The Universityof Tokyo

10aA-7＊Iwate University, ＊＊Hitachi
Kokusai Electric

10aA-8

Measurement of gas temperature The University of Tokyo
and OH density in pulsed corona
discharge

10aA-9Fast Decay of Charge under High Graduate School of Engineering,
Humidity on the Adhesive Tapes Nagoya Institute of Technology
which were charged on Peeling Static Charge changes into a
Water Ion and it goes out into Air-

10aA-10 Influence of Pulse Width of Pulsed School of Engineering, The University

10pA-1

Corona Discharge on Ozone
Generationof Tokyo

Preliminary Experiment Relatedwith Tiny Charge Electrostatic
Discharge

School of Engineering, The Universityof Tokyo

The global warming issued is getting serious problem and we must reduce CO2 emission. The
renewable energy such as wind power is one of the candidate for solve this problem and many
countries consider to introduce it. With the adoption of wind power generation equipment, Japan
has also seen new forms of lightning damage. In the case of winter lightning on the Japan Sea
side, one wind power turbine was struck by lightning 119 times in a single year. Other windmills
reportedly have had lightning damage repair costs over five years that equalled their original
construction costs. Creation of detailed diagrams of the relationship between lightning-prone areasand structures, re-examination of the economics of wind power generation, and research on○Yuya SAITO,
Two-dimensional distributions of OH density and temperature were measured in incipient
Akihiro MAEKAWA,
hydrogen-air flame by using laser-induced fluorescence (LIF) spectroscopy in order to clarify the
Ryo ONO and Tetsuji ignition process of hydrogen gas due to electrostatic discharge. The spark discharge was generated○Takahiro OKUBO＊, An electrostatic neutralization of multilayer-loading silicon wafers is demonstrated using a corona
Masaru OTANI＊,
discharge ionizer in nitrogen atmosphere. We observe a surface potential of the silicon wafer
Kazunori TAKAHASHI decreases from ±1kV to ±20V within three seconds. Moreover, it is claritied that the＊,Seiji MUKAIGAWA neutralization time is affected by the direction of the nitrogen gas flow.
＊, Koichi TAKAKI＊,
Tamiya FUJIWARA＊,
Takeshi ITO＊＊○Ryo Ono, Tetsuji
Gas temperature and density of OH radicals are measured using laser-induced predissociation
Oda
fluorescence (LIPF) in H2O(2.8%)/O2(2.0%)/N2 pulsed positive corona discharge. The discharge
occurs between a 13-mm gap point-to-plane gap with 24 to 32 kV applied voltage. In whole
discharge volume except near the anode tip, gas temperature is 400 K at t = 10 us where t is
postdischarge time. It increases after discharge and reaches 700 K at t = 100 us. On the other
hand, near the anode tip, temperature is quite different. It is 600 K at t = 1 us, rapidly increasing to1100 K by t = 20 us. Then it decreases to 800 K by t = 300 us. The high temperature near theanode tip causes OH production reactions after discharge, O + H2O -> OH + OH and H + O2 ->OH + O. Therefore, the decay rate of OH density after discharge is much slower than that in thewhole volume except near the anode tip. It is shown that OH radicals are mainly produced insecondary streamer. As a result, OH yield per discharge energy increases with discharge voltage. It○Yasuro HORI,
When the charging behavior of adhesive tapes on peeling was investigated, the charges on the
Hitoshi HASEGAWA, adhesive tapes were found to decay fast under high humidity while the charges on a polymer
Takuya HIRAO andadherend did not decay under the same humidity. On the other hand under low humidity theTakeshi YAMAKAWA charges on both of an adhesive tape and a polymer adherend have not decayed. In order toeliminate the contribution of chemicals with low molecular weight other than water and theelectrical conduction, the surface charge decay of nylon-6 film on PTFE film has been measured
under high humidity in which PTFE is an insulator and nylon-6 may adsorbe a lot of water. In thiscondition, the surface charge on nylon-6 has decayed, and so it has been concluded that the static○Kazuhiko TOYODA, In this study, the influence of pulse width of pulse corona discharge on ozone generation efficiency
Ryo ONO and Tetsuji was examined. The pulse width of the discharge was changed by the value of the resistanceODA
connected in parallel to the discharge gap. It was shown that the ozone generation efficiency
increased with decreasing the discharge pulse width.
Hiraru MIYASAKA
Tetsuji ODA

Recent high performance electronic device requires small size causing the minimization of theoperation energy. The tiny electrostatic discharge can easily induce misoperation device failure bythat. Normal electrostatic discharge (ESD) needs high charge which is roughly equal with highvoltage. On the other hand, low voltage ESD should be quite different from the high voltage. Verysmall voltage switching characteristics is examined as the simulation of that low voltage ESD. The
mercury reed relay is used as the discharge device and tested voltage range is from 1.5V to 100V
which is very low and ionization current occurs. The observed rising time of the current is 200ps
which is the limit of the measuring system. The waveform is quite similar among the tested voltage

10pA-2

Electrification fog which arises in Kanagawa Institute of Technology
the fast collision of the water

10pA-3Charging of Adhesive Tapes on
Peeling (2)10pA-4

Spray Charging Properties for
Metallic Paint Spray

10pA-5Experimental study of＊The Graduate School of Naturalelectrification in oil flow through Science and Technology, Okayama
metal channels under the
University
condition of velocity change withtime

10pA-6

Humidity dependency of Contact Faculty of Science & Technology,
Charging of Glass
Tokyo University of Science

10pA-7

Gleitb&uuml;schel of approaching Tokyo University of Agriculture anddischarges do discharge all of the Technology
charges on the electrified surface.

Graduate School of Engineering，
Nagoya Institute of Technology○Hideyuki Motai,
Hirofumi Simokawa

This study examined the electrification charge quantity of fog that a charged water droplet
occurred in doing collision to an aluminum plate. The charge quantity of fog increased with theelectric charge of water droplet in the low-induced voltage region. However, in the high-induced
voltage region, the charge quantity of fog decreased with the charge of droplet. Fall velocity ofwater drop was calculated using the high speed camera. In the high-induced voltage side, the small
water drop widely dispersed and fell. Then the fall velocity was slower than mean flow velocity inthe nozzle. From there velocity, it is found that in the high voltage side, slow velocity small droplet
collide with the plate The momentum of droplet is absorbed in the layer of water, and electriccharge of droplet scatters only small quantity, the electrification fog is considered that only a small○Takeshi
Charging behavior of adhesive tapes on peeling was investigated for various adherends. Five types
YAMAKAWA，Takuya of adhesive tapes were used including 1 acrylic type, 2 silicone rubber type and 2 UVHIRAO，Susumu
polymerization adhesives, and as adherends 11 different polymers, three metals and a silicon wafer
OKUDA，Yasuro HORI were used. The charge amount of acrylic type and silicone rubber type adhesives has beencorrelated to the tribo-electric series of adherends. The charge of adhesive tapes on peeling wasplus at the minus end of tribo-electric series of adherends as PTFE, and minus at PMMA which isplus end in tribo- electric series. On the other hand the charge of UV polymerization adhesive on
peeling is plus for almost all adherends without NY and Metals.
○Shirahata
Polarity and size distribution in spray charging for metallic paint spray have been investigated
NORIYUKI
experimentally. The metallic paint contained aluminum flakes with a thickness of approximately
30nm in organic solvent. The paint was sprayed by a commercial spray gun with a rate of 10mg/s.
The sprayed particles were supplied into a deflection field to separate and collect positive andnegative particles. The particles include both positively ones and negatively ones due to the spraycharging, where the positive ones exist twice as much as negative one. More than half of negative
particles have a diameter less than 2mm, which is significantly smaller than positive one. The size
dependence of charged particle can affect the potential of non conductive target because large
positive particles can deposit more than small negative particles.
○Satoshi
TAKAHASHI＊,
Shouxin ZHU＊,
Seiichi WASHIO＊,
Tomoki TAZATO＊

This present paper deals with basic investigation of flow phenomena in mineral oil flows throughmetal channels with periodical and transient changes of velocities. The sample oil was kept still in areservoir and was suddenly or gradually let flow. The current detected from the metal wall rose toa peak value at the beginning of flow, then exponentially decreased until it leveled off with time,
approaching a constant value. The smaller the acceleration of velocity was, the smaller the peakvalue of current was. A pulsating oil flow was let pass through a metal mesh. The current detectedfrom the metal mesh while the flow was pulsating was larger than the one when the same flow rate
was steadily provided, and decreased as the frequency of pulsation increased. The delay time of
the current behind the pulsating flow rate approached to a constant value as the pulsation○
Contact charging and photoemission of various glass samples are measured. It was found that all
TakanoriOYAMA,Yuji glass samples had clear differences in charging characteristics. Moreover, it was found that
MURATA, and Yusuke charging characteristics of sample glass depends on humidity. There was a correlation between
KUDO
characteristics of photoemission and electrification.
○Kaori ISHIKAWA,
When a grounded object approaches an electrified insulating surface, discharges occur between the
Yasunori OHKUMA
object and the surface. The Gleitb&uuml;schel (large surface discharge) of this “approaching
and Yuzo TAKAHASHI discharge” spreads all over the surface. The measured result shows that the magnitude of
Gleitb&uuml;schel (calculated from the discharge pulse) is same with the magnitude of surface
charge of the sheet. It means the magnitude of Gleitb&uuml;schel becomes very large as the areaof electrified surface increases. In industrial practice or on a thermal blanket of solar cell equipped
on a spacecraft, the dimension of electrified is measured by m or m2: the approaching
Gleitb&uuml;schel will be very large. The energy of a Gleitb&uuml;schel measured in this surface
experiment is as large as 600mJ. Therefore the approaching Gleitb&uuml;schel is very dangerous,
and one must take in account that the magnitude of charge released by the Gleitb&uuml;schel issame as the charge of all electrified surface. In this paper, the reason is explained, why the11aB-1
11aB-2

11aB-3

11aB-4

11aB-5

11aB-6

Toluene removal by combining
discharge plasma and oil film

○Kei SUZUMURA,
Recently, removal of Volatile Organic Compounds (VOCs) has been of great concern. Utilization of
Kenshiro KAWABATA, discharge plasma is one of the novel and effective methods. It is necessary to improve energy
Kazunori TAKASHIMA, efficiency for practical use. In this study, the removal of toluene was studied using a dc corona
Basic Study on Treatment of
Innovation and Joint Research Center, Masaki KANAMORIMicroplasma is generated in atmospheric pressure at about 1 kV, since its discharge gap is in an
Indoor Air Pollutants by
Shizuoka Univercity
and Kazuo SHIMIZU order of micro-meters. Electrical characteristics such as, discharge voltage, current, and power are
Microplasma
obtained. Ozone generation with dry air is experimentally investigated. Formaldehyde, which is amajor cause of sick-building syndrome, is treated by using microplasma effectively and byproductanalysis is also carried out.
Gas phase toluene decomposition Department of Chemical andDaisuke CHIGIRA
Volatile organic compounds (VOCs) cause health hazard, for instance, sick-house syndrome,by pulsed plasma and zeolite
Environmental Engineering, Gunma
carcinogenetic and nerve paralyzing, and air or water pollution. Therefore, various studies haveparticle bed
University
been performed about the decomposition of VOC. It has been known that VOC can be
decomposed by discharge plasma. We tried the decomposition of toluene that is one of the VOC. In
this study, a new system of nonthermal reactor with zeolite particles used as the adsorbent wasstudied to remove and decompose toluene in gas phase. The reactor was consisted of high-voltage
multi-needle electrode and metal mesh, as earth electrode and electrode gap was 22 mm. Pulsed
high voltage (23 kV) was applied to the multi-needle electrode. The reactor was packed withzeolite particles, which has an ability to adsorb toluene. 90 % of gaseous toluene was decomposedcontinuously when bed height was 2.0 mm and 300 ppm toluene gas flow rate was 0.4 L/min.
NOx Treatment Characteristics of Department of Electrical and Electronic Toshiyuki Kawasaki
The simultaneous treatment of gaseous pollutants and suspended particle matter exhausted from
Silent Discharge Reactor Using
Engineering, Nippon Bunri University
a diesel engine is one of the most serious problems in our living environment. Non-thermal plasma
Anodic Porous Alumina asskillfully combined with porous ceramics or/and catalysts is very attractive for the simultaneous
Barriers
treatment. In this study, the anodic porous alumina has been focused as the material using
together with the non-thermal plasma reactor for gas treatment. In his time, NOx treatment
characteristics of the plate-plate type silent discharge reactor were studied using the anodic
porous alumina as barriers.
The anodic porous alumina barriers with the thickness of about 150mm were prepared on the Al
substrate in 1.0M sulfuric acid at 10℃ for 5 hours underthe constant voltage of 24V. Two anodic
porous alumina barriers were faced at the gap length of 1.16mm, and 1kHz high voltage wasapplied using the Alsubstrate as electrodes. The treatment gas was NO（200ppm）/dry air at
NOx Aftertreatment System for osaka jst plaza
Keiichiro Yoshida
A NOx aftertreatment system which uses adsorption, thermal desorption, and NOx reduction by
Diesel Engine Emission Using
nonthermal plasma is applied to a real stationary diesel engine. The NOx is first removed by
Thermal Desorption and Plasma
adsorption, then the adsorbent is regenerated by thermal desorption using waste heat of theReduction Combined Process
exhaust gas. In the regeneration process, hot exhaust gas passes through the heat exchangers
surrounded by the adsorbent pellets. The desorbed NOx is subsequently reduced to N2 by nitrogen
nonthermal plasma. This system continuously reduces more than 60% of 240 ~ 290 ppm NOxemitted by the generator for 55 hours. It shows an excellent overall energy efficiency of 154
Study of NOx removal by low
Innovation and Joint Research Center, Takeki Sugiyama,
Removal of nitrogen oxides by using micro plasma is investigated which is occurred with a pair ofdischarge voltage
Shizuoka Univercity
Kazuo Shimizu
electrodes covered with dielectric barrier. In this paper, characteristics of micro plasma, such as
by using atmospheric micro
the discharge voltages and the discharge power, which is obtained with the help of Lissajous
National Institute of Advanced
Industrial Science and Technology()

11aS-1
11pB-1

Toyohashi University of Technology

NOx Reduction for Boiler
Emission Using the Second
Prototype Pilot-Scale PlasmaChemical Hybrid System

Masayoshi Takahashi＊Osaka Prefecture University, ＊＊○Tomoyuki KUROKI NOx removal from an actual boiler flue gas is investigated using an indirect plasma and chemical
Japan Science and Technology Agency, ＊, Hidekatsu
hybrid system comprising a commercial ozonizer and an Na2SO3 chemical scrubber. A high NOx
Innovation Plaza Osaka，＊＊＊Takao FUJISHIMA＊
removal efficiency in the continuous operation of a commercial-scale apparatus is achieved byIron Works Co.,Ltd., ＊＊＊＊Musashi ＊,Keiichi OTSUKA＊ controlling pH and oxidation reduction potential (ORP) and injecting additional Na2SO3 and NaOH
Institute of Technology＊＊, Tomohiro ITO＊, aqueous solutions into the scrubber sump when required. Ozone injection is demonstrated to be
Masaaki OKUBO
extremely effective for NO oxidation. The relation between the ORP and NOx removal efficiency,＊,Toshiaki
which is essential for the optimal operation of this system, is obtained.
YAMAMOTO＊＊＊＊and Keiichiro
YOSHIDA＊＊

11pB-2

Generation of sliding discharge on Department of Ecological Engineering,an insulator surface
Toyohashi University of Technology

11pB-3

Electrical Discharge in
Graduate School of Science andSupercritical Carbon Dioxide and Engineering, Tokyo Institute ofits Application to Chemical
Technology
Reaction

11pB-4Oxidation of Carbon Double Bond Graduate School of Science andUsing Atmospheric Pressure
Engineering, Tokyo Institute ofNon-equilibrium Plasma Jet
Technology
Generated with Low Frequency
Plasma Power Supply

11pB-5

Reaction Analysis for Steam
Reforming of Aliphatic
Hydrocarbons with Nonthermal
Plasma Using Energy

National Institute of Advanced
Industrial Science and Technology(AIST)

11pB-6

Plasma enhanced ammonia
production at low temperaturefrom solid urea

Toyohashi University of Technology

11aC-1

Fundamental Investigation on theTransportation Model of Single
Microorganism for
Cultivation profiles and PEF
inactivation of blue-green algae
Microcystis aeruginosaTokyo Metropolitan Univ.

Cell Destruction by Dielectric
Barrier Discharge for Real-time
Monitoring of Bio-particles

Toyohashi University of Technology

11aC-2

11aC-3

Department of Chemical andEnvironmental Engineering, Gunma
University

Mitsuyoshi Kimura,
Since particulate matter (PM) in diesel engine exhaust have caused serious air pollution, control of
Satoshi Sato, Kazunori their emission is an urgent problem. Electrostatic precipitator is one of the potential alternatives
Takashima, and Akira because it can remove nano to micro-meter size particles effectively with very low pressure drop.
Hidetoshi SEKIGUCHI The purposes of the research are to study the electrical discharge phenomenon in supercriticaland Sayaka HORIUCHI carbon dioxide by measuring the breakdown voltage and to investigate the possibility of the plasma
chemical reaction in the medium. The experimental data of the breakdown voltage at various
temperatures and pressures for pure carbon dioxide were settled on a smooth curve from thevapor phase to the supercritical phase, suggesting that the breakdown voltage depended on thebulk density of carbon dioxide. When 1-octene was introduced into the reactor, the breakdown
voltage increases at lower pressure as compared with that in pure carbon dioxide. Howeverpressuring the mixture resulted in the disappearance of the difference of breakdown voltage. The
formation of solvation was considered to cause the disappearance.
Hidetoshi SEKIGUCHI Oxidation of 1-decene having a carbon double bond was studied using a non-equilibrium plasma jet
and Yoshinori SUGA at atmospheric pressure. The plasma jet was generated with a low frequency (LF) power source
below a frequency of 10kHz to compare the previous results using a radio frequency (RF) powersource. The experimental results showed that 1-nonanal was most produced among oxidation
products and its production closely related to ozone concentration in the jet, suggesting thatozone oxidized the carbon double bond by different reaction mechanism as compared with theoxidation with RF plasma jet where oxygen atom was a key species. The comparative experiments
were further carried out using styrene and the results confirmed that the different oxidation
mechanisms predominantly proceeded for LF and RF plasma jets similarly to the oxidation of 1ＯMasami
Steam reforming of methane (CH4), propane (C3H8) and neopentane (C5H12) was performed with
SUGASAWA,a ferroelectric packed-bed reactor (FPR). Effects of temperature and water content on the steam
Tomoyukireforming were investigated comprehensively in terms of energy efficiencies for the decomposition
TERASAWA, Shigeru of the substrates and production of H2, CO and CO2. Consequently, it has been found that the
FUTAMURA
almost same compositions of synthesis gases can be formed irrespective of water content andtemperature in the reforming of C3H8.
○Hiroki YAMAUCHI， Urea reforming to ammonia in low temperature using discharge plasma was studied for the NOx
Yoshihiro IITSUKA， selective catalytic reduction of diesel engine exhaust. In this study, a packed bed discharge was
Kazunori TAKASHIMA, used, and results showed that ammonia generation was enhanced significantly by discharge plasma

Shintaro IMAFUKU，
Satoshi UCHIDA，
Fumiyoshi
Shingo ISHIDA

Dielectrophoretic devices are powerful equipment in bioscience and bioengineering, since theelectrostatic force is dominant for behavior of bioparticles in micro space. However, the kinetic
relationship between many bioparticles is extremely complicated because electric and fluid fields
Water-bloom in the hydrosphere has become a problem, which generates some toxic and odorantmaterials. Water-bloom is an outbreak of algae, and Microcystis aeruginosa is one of the majoralgae in it. In this study, we cultivated M. aeruginosa under various temperature conditions, andPEF inactivation of M. aeruginosa cell was studied. The efficiency of PEF treatment was depended
on the applied voltage, and 10kV or more PEF treatment was effective to inactivate M. aeruginosa.
90% of M. aeruginosa cells could be inactivated within 30 min of PEF treatment. During inactivation,color change of M. aeruginosa suspension, green, white, and yellow, was recognized.
Mai HASHIMOTO,
Fundamental study on high speed detection of bio-particles (BPs) in air was carried out. Fine
Masudur RAHMAN,
particles in air were sampled on a collection plate effectively using electrostatic precipitation.
Masakazu TANINO,
Collected particles were exposed to barrier discharge to destroy the cell and to obtain cell lysates.
Michihiko NAKANO,
In 20 sec, E-coli and other cells can be destroyed. In situ electrophoresis in agarose gel andHachiro YASUDA,
membrane filtering were examined to separate the DNA from the other substances in the lysates.
Kazunori TAKASHIMA Transferred DNA was stained with fluorescent dye for microscopic observation. In thisand Akira MIZUNO
experimental condition, majority of the DNA can be transferred through the thin agarose gel layer.
From the experimental results, detection of bio-particles will be possible within 10 min. by11aC-4

Electrostatic Elimination for Small ＊Department of Electrical Engineering, ○Haruhisa FUJII＊,
Particles in Cutting Oil
Nara National College of Technology,
Hiromi KITANI＊ and＊＊Sanwa Daiya Kouhan Cooperation Masatoyo MATSUDA＊＊

11pC-1

Study of Pulsed Power Source
using Semiconductor Switches
for Microplasma Applications

11pC-2

11pC-311pC-4

11pC-5

11pC-6

Innovation and Joint Research Center, 〇Tatsuya ISHII,
Shizuoka Univercity
Kazuo SHIMIZUElectrostatic elimination experiments for small dust particles in cutting oil were carried out in orderto suppress the environmental pollution due to used cutting oil. Used oil including small conductive
dust particles was circulated through an electrostatic elimination part which was consisted of ten
bar electrodes covered with non-woven paper. Elimination efficiency wasevaluated as aparameters of the flow rate of oil, the applied voltage on the bar electrodes and the application

Non-thermal plasma is obtained by pulsed power discharge in atmospheric pressure. In the case of
atmospheric microplasma, the discharge voltage can be adjusted to about 1 kV,since its discharge
gap is in an order of micro-meters. This paper describes the development of pulsed power source
for microplasma by Marx generator using semiconductor switches. An experimental Marx generator
provides discharge voltage of -1.1 kV and duration period of 520 ns.
Basic study of sterilization
Innovation and Joint Research Center, Masahiro YAMADA
Sterilization of microorganism such as Escherichia coli is experimentally investigated by using
technique at low discharge
Shizuoka University
and Kazuo SHIMIZU microplasma. Microplasma is expected for practical application for sterilization, since its discharge
voltage by using Microplasma
voltage is low. In this study, Escherichia coli HB101 is used as the target to be sterilized. From theseries of experimental, decrease in the amount of germs is effectively obtained after microplasma
treatment. In addition, the effect of sterilization increases as the discharge voltage increases.
Improvement of Efficiency of
Yamagata University○Taichi Sugai,Ayato Water pollution is one of the global environmental issues at present. We are studying water
Water Treatment Using Pulsed
Suzuki,Yasusi
treatment using pulsed power discharge in water and air mixture. In this paper, water in a pulsedPower Discharge in Bubbling-up
Minamitani,Yoshio
discharge reactor was injected with airflow to bubble with air. Decololization time of indigo carmine
Water
Higashiyama
by treatment in bubbling-up water is 5.3 times faster than that of non bubbling-up water. As the
airflow for bubbling-up increased, the decolorization time decreased. Likewise, as length of theelectrode on water increased, the decolorization time decreased. These results show that more
discharge space in air makes the decolonization time decrease in the water treatment.
Basic study of Liquid purification Innovation and Joint Research Center, 〇Tomonori SONODA Efficient use of water resources is necessary for development of industry and world populationof water
Shizuoka University
and Kazuo SHIMIZU growth. In particular, degradation of volatile and toxic organic compounds (e.g. trihalomethane,at Low Voltage Discharge
trichlorethylene) and removal of protozoa (e.g. cryptosporidium) in water is demanded. Discharge inliquids are able to produce ultra violet ray, high electric field, shock waves, ozone, free radical,
which could decompose such molecules and materials and sterilize microorganisms. In order toinvestigate degradation capability of organic compounds using low voltage discharge, experiments
on decolorization of indigo carmine solution are carried out. As a result, indigo carmine solution isdecolorized at less than discharge voltage of 2kV.
Electrostatic regeneration of＊Nagoya Institute of Technology ＊ 〇Makoto OHNO＊,＊ An experimental apparatus was build for recycling fluorocarbons using electrostatic separation offluorocarbons for recycle or＊Asada Corporation ＊＊＊National ＊ Taizo ONO＊,＊＊ contaminated oil mists. Oil mists are charged by tribo-charging, and separated using parallel
improvement of efficiency
Institutes of Advanced Industrial＊ Akira MIZUNO＊＊ electrode with dc electric field. The results have proved that the apparatus could regenerate
Science and Technology ＊＊＊＊＊＊
contaminated fluorocarbons nearly to their initial quality. With this regeneration, destruction of
Toyohashi University of Technology
contaminated CFCs can be avoided in many cases, and efficiency of air conditioning system will be
improved, resulting in reduction of CO2 emission.
Adhesion Improvement○Department of Mechanical Eng.
○Toshitomo HIBINO Flexible thin solid films made of fluorocarbon polymers such as PTFE, PFA and PCTFE haveTechnology of Fluoropolymer Film Osaka Prefecture University＊，＊, Masaaki OKUBO excellent properties on flexibility, gas and moisture barriers, etc. Many electrical devise applications
Using Atmospheric-pressure
Technology Research Institute of＊, Mitsuru TAHARA on such as multi-layer flexible electric circuit and flexible displays with long life are possible if the
Plasma Graft-Polymerization
Osaka Prefecture＊＊，Pearl Kogyo＊＊, Noboru SAEKI＊ adhesion property can be improved. We developed a surface modification technique of the films forCo., Ltd.＊＊＊，Department of＊＊, Tomoyuki
adhesion using atmospheric-pressure nonthermal plasma application followed by the graftElectrical and Electronic Eng. Musashi KUROKI＊ andpolymerization of hydrophilic monomer. It was confirmed that the transparent hydrophilic layer
Institute of Technology, Tokyo＊＊＊ Toshiaki YAMAMOTO whose thickness is an order of 100 nm are created on the film surface. Results of T-type peeling＊＊＊＊＊test shows that peeling strength is thirty times larger than that for untreated one. The SEM
picture shows very smooth and flat surface. It is confirmed from the XPS surface analysis that few
F atoms exist on the surface and hydrophilic layer is confirmed due to the grafting.

11aA-1

Influence of Surface Tension on
Negative Corona Onset Voltage
from a Fine water Droplet

11aA-2

Influence of a Induced Current on Graduated School of Science andElectrostatic Discharge Occurring Engineering, Yamagata University
toward a Charged Particle Cloud
Measurements of Contact
Potential Difference and TSC in
Styrene-Acrylic Polymer Powder

11aA-311aA-4
11aA-5

Yamagata University

A Study on discharge current and Department of Electrical Engineering,radiation noise of ESD from
Tokyo University of Sciencecharged metal using
Dependence of the electrostatic Department of Electrical Engineering,discharge occurred between
Tokyo University of Science
metals on the applied voltage○Yuya Ohnishi,
Yoshio Higashiyama

Corona discharge phenomenon was investigated from a water droplet located at a tip of grounded
rod electrode facing to a ring electrode where positive high voltage was applied. De-ionized waterand surface-active agent aqueous solution were used as a water droplet. Viscosity and surface
tension of water was varied with water temperature or existence of surface-active agent. Corona
onset voltage for de-ionized water droplet with temperature from 2 to 80 degrees and that forsurface-active agent were obtained. Corona onset voltage was hardly affected by temperature ofwater droplet, although the value of surface tension varied considerably. Corona onset voltage wasdecreased drastically with surface-active agent due to decrease of surface tension. Negative
corona discharge from a water droplet has a unique waveform. A water droplet located at the rod
electrode forms a water cone periodically. As a result, negative corona discharge with trains of
Trichel-like pulse occurred after formation of a cone jet. Water temperature affected the internal○Kenji Toki, Shin-ichi Electrostatic discharge occurring between a large-scale charged particle cloud and a grounded
Migita and Yoshio
spherical electrode was investigated. The charged particle cloud was formed by the cloudHigashiyama
generators consisting of a blower and corona charger. Powder particles with diameters ranging
Akihiro Suzuki,
Tribocharging mechanism of a styrene-acrylic polymer powder with ferrite carriers was studied by
Manabu Takeuchi
measuring the contact potential differences and TSCs. Several kinds of ferrite carriers withvarious contact potential differences were used in this study. The tribocharges Q/M of polymer
powder were approximately proportional to the contact potential difference between the polymer
and the ferrite carrier. TSC measurements showed that charge carriers were mainly trapped atshallow levels of the styrene-acrylic polymer when the contact potential difference was large, andthat charged at whole levels when the contact potential difference was small.
Takahiro YOSHIDA , In this study, we measure the discharge current and the radiation noise of electrostatic discharge
Atsushi SUMIDA,
from charged metal synchronously to investigate theNoriaki MASUI
characteristics of the noise of the ESD. We discuss the partial distributions of the radiation noise○Atsushi SUMIDA,
In the electrostatic discharge between metals which closes to each other at constant speed, gap
Takahiro YOSHIDA
length of discharge inception is widely distributed even in the constant applied voltage. When theand Noriaki MASUI
metals close to each other at the constant speed, the volume of the discharge space decreases
with the time. Time-lag of spark is generated, since the volume of discharge space decreases andthe probability of existence of initial electron in the gap decreases. It seems to widely distributethe gap length of discharge inception, when the spark delay arises. The gap and metal electrodewere irradiated by the ultraviolet ray in order to sufficiently generate the initial electron, and thecharacteristics of discharge were investigated in the condition without time-lag of spark. Most
discharge was generated in the high electrical field over 100kV/cm, when ultraviolet ray was not
irradiated. Discharge is generated in the electric field from about 40kV/cm to 60kV/cm, when

11pD-1

Electrification of a Human Body National Research Institute of Fire and ○Hiroyuki TAMURA
and Tools from Cleaning Work in Disaster＊、Yokohama City Safety＊、Masayuki
an Oil Storage Tank
Management Bureau＊＊
KURIHARA＊＊

11pD-2

Measurement of ignition energies National Institute of Occupationaland explosive limits for organic
Safety and Healthsolvent vapors, featuring
temperature characteristics

Mizuki YAMAGUMA

While seven workers were cleaning to eliminate sludge in an oil storage tank with floating roof, afire occurred and five workers out of them died. It is thought one of the fire causes is fire ignitionby electrostatic discharge. We investigated into the potential risk of electrostatic discharge. Taking
up some works which are likely to cause electrostatic electrification during the works in the tank,
we measured the surface potential of a human body or tools, and verified the potential risk ofelectrostatic discharge. We carried out operations which simulated the cleaning works in the tank.
The surface electric potential of a human body and clothes at that time were measured. The
surface electric potential did not rise greatly only by work operations. The metal tool with resin
coating has a high possibility to be charged with electricity in a resin part. There was a possibility
that high electric potential appeared in a metal part by this electrification and an electric discharge
was generated. Moreover this electric discharge energy can exceed the minimum ignition energy of
Ignition energies and explosive limits for 15 solvent vapors, as well as the effectiveness of water
vapor as an inert gas, were measured using a newly-developed temperature-adjustable ignition test
apparatus. For all the solvent vapors the minimum ignition energies increased exponentially andexplosive limits expanded as the test temperature increased. Acetone vapor, among others,
depended strongly on temperature -- the MIE at 25 C was less than one third that at 100 C. The
difference of two explosive limits, the limit by an electrostatic spark and by an ac spark, wasgreater for a vapor with a wider explosive limit. Acetone vapor was effectively inactivated when
the water vapor concentration was 30 % or more at 100 C. At 50 C, however, no significant effect11pD-3

11pD-4

11pD-5

Application of an assessment
National Institute of Occupational
method of static ignition risk by a Safety and Healthcharged cloud in grounded vessels
to a jet washing machine withultra-high water pressures
Performance of Flange-Type
Kasuga Denki INC *，Japan national
Explosion Protection Electrostatic Institute of occupational safety and
Neutralizer
health**Development of ion conveying
type ionization system －Generation of large charged＊Technical R&D Center, Techno
Ryowa Ltd. ＊＊Dept. of EcologicalEngineering, Toyohashi University ofAtsushi Ohsawa

This paper presents required conditions of space charge density and wall electric field to prevent
an incendiary brush discharge between a protrusion on a vessel wall and a charged cloud in vessels
grounded and an assessment method of electrostatic ignition risks based on the prevention
conditions. The method is applied to a jet washing machine with ultra-high water pressures up to
84 MPa.
Teruo SUZUKI*，
In order to avoid electrostatic discharges produced from charged powder in industrial process, a
Tomofumi MOGAMI*， flange-type of high-voltage neutralizer was previously proposed. The flange-type neutralizer
Mizuki Yamaguma**， performed quite well in general in laboratory tests of a full-size pneumatic powder transporting
Kwang-Seok CHOI** facility. With regard to practical use, a pressurized type of the neutralizer, which was added afunction of explosion protection, was developed. In this current study, we evaluated the current
version of pressurized type of the neutralizer through real industrial situation tests. As the results,
we confirmed that the pressurized type of neutralizer is markedly effective for reducing
electrostatic charges from polymer materials as well as, it can be used in explosive atmosphere.
○Masanori SUZUKI We have conducted the development of ionization system conveying ions through tubes, in order to＊，Takashi
control static electricity in narrow space such as space in ULSI and LCD manufacturing
MATSUDA＊，Hideaki equipments.In previous paper, we reported the results of evaluation in terms of the influence of