Yasunobu Kino

Time of flight analysis on direct inelastic collision processes of CH4 molecules at a Pt(111) surface

Abstract Speed distribution measurements have been carried out of the hyperthermal methane molecular beam reflected from a Pt(111) surface as a function of the incident kinetic energy of the molecule and the surface temperature. Obtained results are found to qualitatively agree with the expectations derived from the Hard Cube model (HCM) calculation. The departure of the experimental results from the expectation increases with increasing the incident kinetic energy as well as increasing the surface temperature. This is considered to be due to the presence of adsorbates produced during the decomposition processes of the hyperthermal methane beam at the surface, which decreases the effective mass of the surface atom and increase the surface “roughness”.

Inelastic Collision Processes of Methane and Ethane Molecules at a Pt(111) Surface Studied by Molecular Beam Scattering Techniques.

Despite distinct differences in molecular structures and chemical bonds of various alkanes, the inelastic collision processes of CH4 and C2H6 on a Pt(111) surface have been found to be very similar. Both processes can be explained qualitatively by a simple classical binary collision model. Angular intensity distributions of reflected molecules of both species indicate that direct inelastic collision is primarily governed by the molecular mass, the incident kinetic energy of the molecule and the surface temperature of the Pt(111). Other factors such as the molecular structure and chemical bond play minor roles in the process. However, the degree of inelastic collision, that is, the energy transfer rate per collision, increases with the molecular mass. Helium atom scattering has revealed that the dissociation process on the surface is identical for both molecules depending on the incident energy and the surface temperature, as methyl moiety, ethylidyne moiety and complete decomposition into carbon and hydrogen atoms, successively. At elevated surface temperatures, however, thermally assisted hydrogen tunneling appears to dominate ethane dissociation.

A Novel He Atom Scattering Technique Complementary to Temperature Programmed Desorption

We have investigated a novel method utilizing the He atom scattering (HAS) technique which is most sensitive to surface adsorbates, and is complementary to temperature programmed desorption (TPD). The principle of this novel method is discussed. The novel technique is demonstrated by monitoring the coverage of desorbing species from a Pt(111) surface irradiated with hyperthermal ethane molecules. The new technique will provide us with information on the binding energy and concentration of adsorbed species at very low coverage which cannot be obtained with the conventional TPD process.

Text Analysis for Job Matching Quality Improvement

Abstract Recently employment options based on fulltime and part-time models have increased. Companies may outright hire fulltime and part-time staff or hire temps through a staffing agency. In this case staffing agencies will facilitate the candidate to company match. Each individual has their own personalities and as a result, each individual has favorable and unfavorable job situations. When the staffing agency, taking into consideration characteristics, introduces the optimal job match, both the company and the individual reap benefits. In the case a suboptimal match takes place, the individual and company may end up in a damaging, unfavorable situation. Therefore, it is important not only for the staffing agency but also for our society to improve the quality of candidate to company match. In this paper, we analyzed data actually used in matching to understand the key factors for better matching. The data includes commute time, job location, job type, hourly rates, skill set of candidate, and so on. Of these attributes, using a text-mining tool, we specifically analyzed text data which had been written by recruiters at a staffing agency. As a result, we could extract positive and negative keywords affecting the matching result.

He Atomic Beam Scattering Study of Pt(111) Super-Structure Surface Induced by High Energy Molecular Beam of H2O

The super-structure, Pt(111)-(2×2), is investigated both by He atomic beam scattering (HAS) and low energy electron diffraction. The structure is produced by irradiation of a high energy H2O molecular beam, which is accelerated up to about 300 meV by dilution in He gas molecules. The HAS result shows that the structure is stable at 200 K and becomes unstable as the sample temperature is raised to 300 K. The observed structure is believed to be due to reconstruction of the Pt(111) surface, which is caused by H atoms produced during the collision process of H2O molecules with sufficiently high energy for dissociation.

Conceptual Modeling supported by Text Analysis

Abstract To think of society as a system is important. Conceptual modeling is a helpful method to analyze society as systems. Flow charts, Entity-Relationship Diagrams and other modeling techniques in software engineering are useful for analyzing and designing society as systems. As we human beings think/understand the universe and society using natural language, the use case and narrative sorties are effective ways to design society as systems. This research will discuss the creation of a conceptual model supported by the use of text analysis.

Decision Making Process for Selecting Outsourcing Company Based on Knowledge Database

In system development projects, there is increasing number of cases requiring decision making to be conducted using official process. In this paper, the idea of Analytic Hierarchy Process and Linear Programming are introduced into the framework of the traditional decision making process. In addition, decision making process is continuously improved by eliminating cognitive bias in evaluator, by registering the differences between the initial decision making result and corrected result to Knowledge Database. The proposal was applied to a real case and the width of correction required has reduced after series of process improvements.

Extraction of the Project Risk Knowledge on the Basis of a Project Plan

When identifying project risks, a checklist created from the former projects tends to be used. However, each project has its uniqueness. If we would like to make a check list comprehensive and available for every project, it would end up containing large amount of items to be checked. Also that type of checklist could prevent a project manager from considering its essential risks in the project and make the risk identification process routine. As a result, it could decrease the effectiveness of risk management, especially when its done by an entry-level project manager. In this research, methods for creating a useful checklist to reduce these problems are discussed, by using knowledge based risk identification support system which extracts a few yet important check items depending on the characteristics of a target project.

Surface Morphology of Ba Atomic Layer on a LiF(001) Surface Studied by He Atomic Beam Scattering

He atomic beam scattering has revealed the morphology of a thin Ba layer on a LiF(001) surface. The Ba atoms randomly deposited on a LiF(001) surface followed by subsequent annealing form an atomically flat atomic-order layer. The layer does not reflect the periodic structure of the substrate. Flatness of the layer before and after annealing is evaluated using the hard cube model with surface roughness parameters. Prolonged annealing causes Ba atoms to react with the substrate and roughens the surface. The structure of the reaction product measured by He atomic beam diffraction shows periodicity twice as large as that of the substrate.