List of Dissertation Abstract（Risk Management and Environmental Sciences
NameSupervisor

Title

Safety Management Course）

Abstract
In this research, we did an experiment of helium plumes to grasp the entrainment characteristics of thesource which exits low density gases.After we analyzed that experiment of helium with theoretical formulathat was derived by Maarten van Reeuwijk et al, compared and considered entrainment coefficient

Yuta
Kinoshita

Entrainment of low density gas
Yasushi Oka

α.Regarding the acceleration of centerline velocity and the behavior of the density around neighboring

plume in the vicinity of the outflow region, we were found that we could evaluate α appropriately because it expressed with theoretical formulasourceof Richardson number and turbulence kinetic energy.As for the value α related to it, The helium outflowed
was compressed by the density difference surrounding at a nozzle outlet height of 0.03m or less, It
gradually raised in a laminar flow state without rolling up air.Our data suggested that the field that
accelerated buoyancy around 0.07m in height and the transition point to the plume region.
Risk analysis is a useful tool to identify hazards and undesirable accidents in a hydrogen filling station.

Hazard analysis for hydrogen

However, characteristic hazards which are involved in a hydrogen filling station cannot be accurately

Hiroyuki

Atsumifilling station with a hydrogen

identified because potential victims are not classified by the existing process safety method. The purpose ofAOKIMIYAKE

production system using organic

this study was to identify hazards which cause damage to users such as employees and drivers. The productchemical hydride

safety analysis method was applied to the hydrogen filling station with a hydrogen production system usingorganic chemical hydride. From the examination results, I identified hazards affecting users.
When a fire occurs on the ocean, the location of the fire source varies with time, unlike fire on land.

Plume property above a fire source
Masami Iizuka Yasushi Oka

with a simple harmonic oscillation
in horizontal direction

Therefore, we aimed at grasping the temperature and speed characteristics of the hot air flow formed on theshaking fire source by simulating the fire source in a simple vibration in the horizontal direction. As a result,it was found that by correcting the heat generation rate with the moving speed of the fire source, it ispossible to predict the temperature and speed on the perturbed fire source from the equation of thetemperature / speed attenuation of the existing fire plume.

Fire-fighters are working under severe condition. To avoid unsafe state and to continue stable fire-fighting
activities, the evaluation of physical state of each fire-fighter is one of the most important issues. ThisShinji
OGAWAYasushi OKA

An investigation ofevaluation of fire-fighters can provide useful information for stable fire-fighting activities by early

cardiopulmonary load level of highreplacement, support to manage organized and efficient activity. Four kinds of exercises were done by fire-load workers

fighters department city of Yokohama and assessment of fatigue condition was conducted based on changes
in the biological information (electrocardiographic R-R interval, respiratory metabolism etc.) during theseexercises.
Recently, as the momentum for hydrogen energy dissemination is increasing, development and social

Ryunosuke

Tadahiro

Risk assessment in a hydrogenSATO

SHIBUTANI

station using accident case analysis

implementation of fuel cell vehicles are being promoted as one of them. One of the challenges for social
implementation is the construction of a safe hydrogen station and safety assessment at hydrogen stations isnecessary. In this study, a characteristic accident scenario for each use period of the hydrogen station wasextracted by accident case analysis and the risk assessment for the accident scenario was performed.
Chloroethylene (VC) is a new controlled substances and is produced by biodegradation oftetrachloroethylene and trichloroethylene in groundwater. In this study, the behaviors of chloroethylenes

NatsukoTakeshi

TAKAHASHI

KOBAYASHI

The prediction of Chloroethylenesin soil were predicted. Using experimental parameters of biodegradation and adsorption to soil, the eachbehavior in soil and consideration

concentration changes of chloroethylenes were calculated. When groundwater was polluted by 100 timesof the monitoring method.

of the environment standard value for the groundwater of tetrachloroethylene, VC concentration ingroundwater exceeded the environment standard value. However it was difficult to detect the VC using asurface soil gas investigation.
A variety of chemicals are contained to indoor products. There are concerns about exposure to variousConstruction of the Screening
MayukaTakeshi

Methods for High Risk Concern

TOMIZAWAKOBAYASHI

Chemicals at Various Exposure inIndoor Envieronmentchemicals in indoor environment. The objective of this study is construction of the screening methods forhigh risk concern chemicals other than 13 chemicals which established guidance level of indoor air. We
create the risk information database for 1697 chemicals and the risk screening methods for indoor chemicals
in consideration 7 exposure route. According to the results, total 82 chemicals are determined high risk
concern chemicals by either exposure route. For these 82 chemicals, the need of management wassuggested.

In this study, we focused on the development of environmental-friendly electrodeposition process using
Analysis of electrochemical(Nd1/3, K)TFSA low temperature molten salts. For this purpose, the electrochemical and nucleation

behavior for Nd(III) in (Nd1/3,behaviors of Nd(III) were investigated in this system. In particular, the complexation state and ionicAtsuki

MasahikoNISHIMURA

MATSUMIYA K)TFSA low temperature molten
salts

conductivity of Nd(III), which are related with the electrochemical behaviors, were evaluated in this study.
Finally, it was revealed that Nd metal was electrodeposited by potentiostatic electrodeposition using low
temperature molten salts.
In fireworks, the effect of humidity on deterioration and combustion change wasn't known well. IYosuke

Mieko

NISHIWAKI

KUMASAKI

The study on hygroscopic
deterioration and combustionchange of the AP/Mg Fireworks

investigated Ammonium perchlorate / Magnesium mixture which is used as fireworks and easy todeteriorate by moisture cause to reveal problem and prevention methods of hygroscopic deterioration infireworks. The deterioration was measured and the mechanism was considerated. The effect of thedeterioration on combustion was studied. And the relationship between atmosphere of stoarege area anddterioration was measured and considered.
In recent years, from the perspective of effective use of land, the number of constructions which are takenplace in a great depth underground space is increasing. Consequently occupational accidents due to burning

Keita Hitachi

Hideo Ohtani

Effects of sweat on combustion ofof clothing occurs under high pressure like the construction site using the pneumatic caisson method. The

fabrics under high pressure

objective of our work is to determine the effect of sweat on combustion of fabrics under high pressure.

conditions

Fabrics with NaCl aqueous solution did not ignited at 0-4 atm (gauge pressure). Though smoldering became
active in the presence of NaCl aqueous solution which contains NaCl on the same level with sweat, and at
higher concentration of NaCl, NaCl acted like the flame retardant.

Since whiskers generated from the plating inside the electronic equipment cause a failure of the equipment,

TakashiTadahiro

MAKI

SHIBUTANI

Acceleration of Whiskers Initiation
due to Additional Element andElucidation of the Mechanism

a technology for suppressing the occurrence has been demanded, but in recent years it is also expected to be
used as an electrode material by intentionally generating it on the sample surface. In this study, by adding
Cu and Ru to Sn plating, we observe the growth of defects and whiskers in a short period, calculate thevolumetric change amount and growth rate of defects, and perform strain analysis by image correlation
method , And examined its mechanism.

Hazard analysis is indispensable to promote the safety hydrogen refueling station. In this research, we haveHitoshiMISONO

Hazard analysis method inNaoya KASAI

hydrogen refueling station by using
physical modelingsucceeded to create a hazard analysis model of hydrogen refueling station by using physical modelingsoftware. And the hazard of hydrogen refueling station parameters such as the amount of leakage, pressure,temperature, was obtained. By using the created model, we also proposed a method of efficiently evaluating
the influence and importance of safety measures using statistical methods when multiple safety measuresinside a station are fail.
We have proposed the effectiveness of solvent extraction on the development of efficient recovery process

Sena

Masahiko

MURAKAMI

MATSUMIYA

Analysis of solvation structure forfor rare earth elements. In this study, solvation structure of diglycolamide (DGA) ligands, which extract

extracted rare earth complexes

rare earth ions effectively, was investigated by spectroscopic methods and density functional theory (DFT).

with DGA ligands using

As a result, stoichiometry and stability constant of DGA complexes were revealed by spectroscopic

spectroscopic methods and density

measurements. Moreover, bond length between the rare earth ion and the ligand, and electron density infunctional theory

DGA molecule were calculated by DFT and difference in stability of the complexes was discussed in thisstudy.
Ferrocene is a flammable substance, but when it is decomposed, atoms of iron are released and attack toRika

Hideo

YAMAZOEOHTANI

Study about the fire extinguishingradicals and stop chain reactions. Currently, the ABC dry chemicals are used mainly. But, phosphorous

performance of the dry chemicals

including that has the crisis of exhaustion and price hikes. So I used ferrocene instead of phosphorous, andcontaining ferrocene

extinguished the fire. The dry chemicals containing ferrocene showed high fire extinguishing performanceat low concentration and revival suppressant effect.