40 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Wakayama UniversityJP5 papers
- Meijo UniversityJP4 papers
- Hokkaido UniversityJP3 papers
- Hokkaido University of ScienceJP3 papers
- Kyushu Institute of TechnologyJP3 papers
- Meiji UniversityJP3 papers
- Hokkaido Pharmaceutical UniversityJP2 papers
- Hokkaido University of EducationJP2 papers
- Autorité de sûreté nucléaire et de radioprotectionFR1 paper
- Centre National de la Recherche ScientifiqueFR1 paper
- Czech Academy of Sciences, Nuclear Physics InstituteCZ1 paper
- East Carolina UniversityUS1 paper
18 papers
Monte Carlo study on critical exponents of the classical Heisenberg model in ferromagnetic icosahedral quasicrystal
Shinji Watanabe, Tsunetomo Yamada, Hiroyuki Takakura +1
Quasicrystals (QCs) lack three-dimensional periodicity of atomic arrangement but possess long-range structural order, which are distinct from periodic crystals and random systems.…
Exact vacuum solution with Hopf structure in general relativity
Junpei Harada
An exact solution to the vacuum Einstein equations is presented, whose structure is based on the Hopf fibration. The solution employs a geodesic null vector field that defines a tw…
Evaluation of the uncertainty in calculating nanodosimetric quantities due to the use of different interaction cross sections in Monte Carlo track structure codes
Carmen Villagrasa, Giorgio Baiocco, Zine-El-Abidine Chaoui +11
This study evaluates the uncertainty in nanodosimetric calculations caused by variations in interaction cross sections within Monte Carlo Track Structure (MCTS) simulation codes. N…
Gauge-invariant formulation for the gravitational wave equations
Junpei Harada
A gauge-invariant formulation for the gravitational wave equations is presented. Using this approach, weak, plane wave solutions in a vacuum are derived in various theories. These…
Gravity at cosmological distances: Explaining the accelerating expansion without dark energy
Junpei Harada
Three theoretical criteria for gravitational theories beyond general relativity are considered: obtaining the cosmological constant as an integration constant, deriving the energy…
Dark energy in conformal Killing gravity
Junpei Harada
The Friedmann equation, augmented with an additional term that effectively takes on the role of dark energy, is demonstrated to be an exact solution to the recently proposed gravit…
Cotton gravity and 84 galaxy rotation curves
Junpei Harada
Recently, as a generalization of general relativity, a gravity theory has been proposed in which gravitational field equations are described by the Cotton tensor. That theory allow…
Objective measurement of pitch extractors' responses to frequency modulated sounds and two reference pitch extraction methods for analyzing voice pitch responses to auditory stimulation
Hideki Kawahara, Kohei Yatabe, Ken-Ichi Sakakibara +3
We propose an objective measurement method for pitch extractors' responses to frequency-modulated signals. The method simultaneously measures the linear and the non-linear time-inv…
Emergence of the Cotton tensor for describing gravity
Junpei Harada
It is shown that the Cotton tensor can describe the effects of gravity beyond general relativity. Any solution of the Einstein equations with or without the cosmological constant s…
Simultaneous measurement of time-invariant linear and nonlinear, and random and extra responses using frequency domain variant of velvet noise
Hideki Kawahara, Ken-Ichi Sakakibara, Mitsunori Mizumachi +2
We introduce a new acoustic measurement method that can measure the linear time-invariant response, the nonlinear time-invariant response, and random and time-varying responses sim…
Connection independent formulation of general relativity
Junpei Harada
A connection-independent formulation of general relativity is presented, in which the dynamics does not depend on the choice of connection. The gravity action in this formulation i…
Frequency domain variant of Velvet noise and its application to acoustic measurements
Hideki Kawahara, Ken-Ichi Sakakibara, Mitsunori Mizumachi +3
We propose a new family of test signals for acoustic measurements such as impulse response, nonlinearity, and the effects of background noise. The proposed family complements diffi…
Real-time and interactive tools for vocal training based on an analytic signal with a cosine series envelope
Hideki Kawahara, Ken-Ichi Sakakibara, Eri Haneishi +1
We introduce real-time and interactive tools for assisting vocal training. In this presentation, we demonstrate mainly a tool based on real-time visualizer of fundamental frequency…
Extension of Malcev algebra and applications to gravity
J. Harada
We investigate extensions of Malcev algebras and give an explicit example of extended algebras. We present a new algebraic identity, which can be regarded as a generalization of th…
A modulation property of time-frequency derivatives of filtered phase and its application to aperiodicity and fo estimation
Hideki Kawahara, Ken-Ichi Sakakibara, Masanori Morise +2
We introduce a simple and linear SNR (strictly speaking, periodic to random power ratio) estimator (0dB to 80dB without additional calibration/linearization) for providing reliable…
Strong Completeness and the Finite Model Property for Bi-Intuitionistic Stable Tense Logics
Katsuhiko Sano, John G. Stell
Bi-Intuitionistic Stable Tense Logics (BIST Logics) are tense logics with a Kripke semantics where worlds in a frame are equipped with a pre-order as well as with an accessibility…
Gauge coupling unification with extra Higgs doublets
Junpei Harada
Gauge coupling unification is studied within the framework where there are extra Higgs doublets and exotic fields. Supersymmetric models and nonsupersymmetric models are inve…
Haagerup approximation property for arbitrary von Neumann algebras
Rui Okayasu, Reiji Tomatsu
We attempt presenting a notion of the Haagerup approximation property for an arbitrary von Neumann algebra by using its standard form. We also prove the expected heredity results f…