List of Dissertation Abstract（Risk Management and Environmental Sciences Safety Management Course）
NameSupervisor

Title

Abstract
Techniques for evaluating corrosive environments of social structures now has low accuracy. In order toLiu XIAO

Naoya KASAI

Research on development ofdevelop a monitoring system that can observe high accuracy and long time, Kasai laboratory fabricated acorrosion monitoring system withstrain amplification circuit. In this research, we conducted a corrosion monitoring experiment using a 4-4 gauge methodgauge method and conducted a corrosion monitoring experiment in order to reduce the effects oftemperature change and noise.
Regarding the risk assessment of automated driving, the problem is how to evaluate the behavior of theProposal of Reliability Assessment

system against a varied surrounding environment. At that time, in addition to the conventional evaluation

ShuTadahiro

Method of Automated Driving

method focusing on the reliability of the internal components, it supposed to be necessary to implement anAOYAMASHIBUTANI

System Utilizing Humanevaluation method focused on human-like error by the system while considering external influences. ThisReliability Assessment Method

study evaluated the automated driving system by Human Error Assessment and Reduction Technique(HEART) which is a human reliability evaluation method, and summarized the problems.
The number of occupational accidents in Japan is decreasing, but the tendency to decrease has slowed. ATomoya

Mieko

ISHIMARU

KUMASAKI

Study on safety intervention tochange the safety behavior ofworkers

large number of workers still suffer from it. One of the most important remedies to overcome the current
situation is that changing safety attitudes of workers by improved interventions. However, from the trend of
the number of accidents caused by occupational injuries, the effect of prevention of injuries by safetymeasures has not contributed much. As a new viewpoint on workplace accident prevention, understanding
how behavior change will enable effective safety interventions in the work place.

Hisashi OTA

Masahiko
MATSUMIYA

Development of purification forThis study was focused on a novel bench-scale hydrometallurgical procedure and electrodeposition usingrare earths from Nd-Fe-B magnets

low temperature molten salts for the recovery of rare earths from spent Nd-Fe-B magnets. The investigation

by hydrometallurgy andwas performed at bench scale process based on leaching, deironization, and purification of rare earth amide

electrodeposition using lowsalts. Finally, a series of material flow indicated the effectiveness of the novel recovery process for practicaltemperature molten saltsuse.

By warming underground using exhaust heat, chlorinated volatile organic compounds in soil are eluted in

Daichi KUBO

Takeshi
KOBAYASHI

Effect of elevated temperature ongroundwater,. In this way, there is a possibility that efficiency of the water lifting aeration treatment processadsorption equilibrium and elution

can be improved. In this study, to determine the dissolution promoting effect of chlorinated volatile organic

rate of volatile organic compounds

compounds by heating, the adsorption equilibrium and dissolution rate at different temperature conditions

in soil and construction of soil

were measured and analyzed. By heating from 15 to 40℃, the soil adsorbability decreased approximately

dissolution prediction model

40,50, 30,20% with tetrachlorethylene trichloroethylene, dichloroethylene, chloroethylene. Moreover, about
1.3 times in Sand, 1.3 times in loam soil, has been shown that dissolution rate becomes faster.

KeitaMasahiko

KURIBARA

MATSUMIYA

Analysis of solvation structure forThe purpose on this study was focused on the analysis of solvation structure for rare earth (Pr, Nd, Dy)rare earth complex and evaluation

complexes. The solvation number for rare earth complexes and thermodynamic property of ligand wereof thermodynamic property byevaluated from Raman spectroscopy. Moreover, the model of rare earth complexes was designed on thisRaman spectroscopy and DFTstudy. Finally, the binding energy, the partial charge and the complex state were evaluated from thecalculation

optimized structure by DFT calculation.
In this study, we tried to evaluate the void damage of the steel material during the tensile test. Specifically,

Wataru SUE

Kasai
NAOYA

Study on AE generation behaviorof steel materials focusing on strain
localization

the AE during tensile test was measured by preparing test pieces with flat plate and grooves of two kinds ofsteel types with different destruction modes. Then we considered the relationship between AE and the void
damage process until the steel material was destroyed. In addition, the localization of the strain of thespecimen during the tensile test was simultaneously measured. Then we examined the relationship between
generation and growth of voids and AE.
In this study, we aimed to evaluate the inhibition effects of calcium by using calcium compounds withanions which have no combustion inhibition ability, i.e., calcium acetate, calcium hydroxide, calciumnitrate, and calcium oxide. The inhibition effects were evaluated by measuring the downward flame spread

Takuya

Hideo

Combustion Inhibition Effects of

HAGA

OHTANI

Ca Compounds

rates over narrow thin filter-paper sheets on which each Ca compound was adsorbed. The results showedthat the inhibition effects are not observed for calcium nitrate and calcium oxide, whereas calcium
hydroxide and calcium acetate show the inhibition effects. Our previous study revealed that, for ironcompounds, the inhibition effects are negatively correlated with the binding energy. We found a similar
trend for the Ca compounds used in the present study.

The explosion properties of alkene/nitrous oxide (N₂O) mixtures were investigated. In addition, this study
explored the explosion limits of alkane/alkene/N₂O mixtures and evaluated the applicability of LeTakashi

HideoExplosion properties of n-HASEGAWAOHTANI

alkene/nitrous oxide mixtures

Chatelier's rule and VAFT method to those mixtures. For alkane/alkene/N₂O mixtures and alkene/alkene/N₂O mixtures, Le Chatelier's formula successfully predicted their lower explosion limits, while theapplicability of the rule was less adequate for their upper explosion limits. VAFT method predicted upper
explosion limits more accurately than Le Chatelier's rule. We found that VAFT model can be used for new
estimation method of upper explosion limits.
In this study, we investigated thermal ignition property of enretic ionic liquid propellants expected as newmonopropellant. As thermal ignition method, laser ignition is selected. We researched thermal ignition

MamoruAtsumi

Thermal ignition of energetic ionicproperty when heating propellants using laser. In this result, energetic ionic liquid propellants were ignite byHAYATAMIYAKEliquid propellant

laser heating. For predict ignition delay time, temperature rise ignition model was constructed considered ofthermal decomposition rate, laser condensing, and absorption. Thermal decomposition rate is predictedusing kinetics analysis.
The properties of a ceiling-jet propagating along the ceiling of a tunnel with specific spatial characteristics
are fundamentally different from those under an unconfined ceiling because the ceiling-jet in a tunnel isKenya
HINATA

Yasushi OKA

Study on ceiling-jet property

influenced by the sidewall and differs depending on the presence or absence of forced ventilation. The

considering the difference ofobjective of current work is to examine experimentally in detail the ceiling-jet properties propagating along

rectangular cross-section shape

the tunnel axis from the point of view of both of temperature and velocity and to develop easy-to-use
empirical correlations to represent the temperature and velocity distribution of the ceiling-jet considering
the effect of rectangular cross-sectional shape of the tunnel.
In this study, an analog simulator was introduced as a failure mode estimation method in Highly

Ryoma

Tadahiro

Failure Mode Estimation Utilizing

Accelerated Life Testing (HALT). Voltage anomaly of a small operational amplifier circuit board wasHIRATASHIBUTANI

Analog Simulator in HALT

analyzed by creating fault circuit models. The failure mode confirmed by HALT was estimated from theFMEA sheet prepared from the analysis result.

In recent distillation process for solvent recovery, compositions of waste solvents have become

TomohiroAtsumi

HOMMA

MIYAKEStudies on runaway reaction
assessment method in distillation
process for solvent recovery

diversified by globalization of materials which are used in suppliers of waste solvents. For this reason, itis concerned that unexpected impurities mix to the distillate. Unexpected impurities are likely to cause arunaway reaction of solvents. This study developed an assessment method of runaway reaction thatprocess operators can properly determine an analytical sample and experimental method for the analyticalsample at the stage of hazards assessment.

Fatigue limit and hydrogen

I aimed to acquire fatigue property and evaluate hydrogen resistance of XM-19. Fatigue test and SEM

ShoutaTadahiro

resistance evaluation of highwere used to estimate fatigue limit and ftigue crack growth characteristics. The composition of the metalYAMAMOTOSHIBUTANI

pressure hydrogen-resistantsurface was examined with XPS. When the surface was scratched, XM-19 was found to be easily brokenmaterial XM-19and the oxide film disappeared.
This study investigated the abilities to extinguish n-heptane pool fires of aqueous solutions of organic
solvents and the effects of spray characteristics, evaporation rate and flammability on the suppression

Yohei

Hideo

YAMAMOTOOHTANI

Fire Extinguishing Capability ofefficiency. The concentrations of their organic solvents were varied between 1 and 20 vol%. Results

Aqueous Solutions of Organic

confirmed that (1) Ethanol and 1-propanol solutions exhibit 3–5 times higher the extinguishing abilities

Solvents

than a conventional wet chemical (i.e., 45 wt% aqueous solution of potassium carbonate) and (2) theirsuppression capability is strongly dominated by mass flux, which is one of the spray characteristics, andtheir flammability.

KentoYOTSUYANAGI

Application of Mass-ConsistentYasushi OKA

flow model to predict smoke flow
behaviour in tunnel fire

It is very important to predict the heat flux behavior at the time of fire, and we tried to apply a simple
wind speed field estimation model to tunnel fire property prediction in order to predict in a relatively
short time. In this study, we used a numerical calculation program (FDS) to determine primary estimatesat arbitrary positions in tunnels necessary for prediction.