Nagoya Institute of Technology

About: Nagoya Institute of Technology is a education organization based out in Nagoya, Japan. It is known for research contribution in the topics: Thin film & Turbulence. The organization has 10766 authors who have published 19140 publications receiving 255696 citations. The organization is also known as: Nagoya Kōgyō Daigaku & Nitech.

Low-Temperature Synthesis of β-Ca2SiO4 from Hillebrandite

Abstract: Experiments on hydrothermal synthesis were conducted using quartz or silicic acid and lime as starting materials at Ca/Si = 2.0. It is possible to synthesize pure hillebrandite (Ca2(SiO3)(OH)2) having the theoretical composition by heating at 200°C for 10 h or at 250°C for 5 h. The synthesized product is fibrous, open at each end, and has a length of 20 to 30 μm. Calcium silicate hydrate gels are produced at the initial stage of the reaction. These react further with the unreacted lime to give hillebrandite. However, when silicic acid is used as silica, hillebrandite with tricalcium silicate hydrate is observed at 250°C because of the high reaction rate of silica. On heating, hillebrandite starts to decompose at about 500°C and produces low-crystalline β-Ca2SiO4, which is stable at room temperature and has a remarkably large specific surface area of about 7 m2/g. The decomposition reaction rate in a single crystal is rapid, and the reaction is considered to proceed topotactically.

Theory of nonlinear damping due to dislocation hysteresis

Abstract: The nonlinear phenomena of damping are analysed in detail and formulated in two integral transformations; the volume and time integrals. This formulation enables one to examine the relationship between damping and tensile experiments in the microstrain range, and to describe the phenomena consistently in terms of dislocation behavior. An analysis of the amplitude-dependent internal friction is made by the use of the breakaway and friction models under the quasi-static condition. The generalized friction model is presented, which is the most appropriate for the analysis of internal friction under the steady-state vibrations in usual experiments. Several convenient formulae are given for the interpretation on dislocation mechanisms. This approach includes some earlier work such as the Granato-Lucke theory and the Davidenkov-Pisarenko formulation as a special case. In addition, the applicability of the Granato-Lucke theory is critically examined with reference to recent observations of stress-strain hysteresis.

Admittance and Impedance Representations of Friction Based on Implicit Euler Integration

Abstract: Modeling of friction force is cumbersome because of its discontinuity at zero velocity. This paper presents a set of discrete-time friction models for the purpose of haptic rendering and virtual environment construction. These models allow friction to be treated as an admittance-type or impedance-type element of a virtual environment. They are derived from implicit Euler integration of Coulomb-like discontinuous friction and linear mass-spring-damper dynamics, and have closed-form expressions. They include rate-dependent friction laws, and their extension to multidimensional cases is easy in most practical cases. The validity of the models is demonstrated through numerical examples and implementation experiments

Site-Selection in Single-Molecule Junction for Highly Reproducible Molecular Electronics

Abstract: Adsorption sites of molecules critically determine the electric/photonic properties and the stability of heterogeneous molecule–metal interfaces. Then, selectivity of adsorption site is essential for development of the fields including organic electronics, catalysis, and biology. However, due to current technical limitations, site-selectivity, i.e., precise determination of the molecular adsorption site, remains a major challenge because of difficulty in precise selection of meaningful one among the sites. We have succeeded the single site-selection at a single-molecule junction by performing newly developed hybrid technique: simultaneous characterization of surface enhanced Raman scattering (SERS) and current–voltage (I–V) measurements. The I–V response of 1,4-benzenedithiol junctions reveals the existence of three metastable states arising from different adsorption sites. Notably, correlated SERS measurements show selectivity toward one of the adsorption sites: “bridge sites”. This site-selectivity repr...

Enantioselective Reaction of Imines and Benzyl Nitriles Using Palladium Pincer Complexes with C2‐Symmetric Chiral Bis(imidazoline)s

Abstract: Enantioselective reactions of a wide variety of benzyl nitriles with N-tosylimines catalyzed by novel chiral 1,3-bis(imidazolin-2-yl)benzene-palladium(II) [Phebim-Pd(II)] complexes have afforded the respective products in high yield with good enantioselectivity. A reaction mechanism is proposed based on X-ray crystal structures of palladium complexes.