211 research outputs found
Modified Hager's method
No full text<p>The programs estimate 1-norm or 2-norm condition numbers of preconditioned matrices. As samples, matrices with Poisson's equation and FEM are included. In addition, Octave/Matlab scripts are included to provide reference results.</p>
<p>The programs in this archive are based on the algorithms in the article titled "Condition Number Estimation of Preconditioned Matrices" submitted to PLOS ONE.<br />
The programs are produced by the author of the article, Noriyuki Kushida.</p>
Tensile Deformation Behavior of 1 GPa-Grade TRIP-Aided Multi-microstructure Steels Studied by In Situ Neutron Diffraction
No full textSpinal cord transection inhibits HR reduction in anesthetized rats immersed in an artificial CO2-hot spring bath
No full textThis is the author-created version of Springer, Yamamoto, Noriyuki ; Hashimoto, Masaaki, International Journal of Biometeorology, 51(3), 2007, 201-208. The original publication is available at www.springerlink.com.
authorLike humans, the heart rate (HR) of anesthetized rats immersed in CO2-water is lower than that when immersed in tap water at the same temperature. To investigate the afferent signal pathway in the mechanism of HR reduction, Wistar rats were anesthetized with urethane and then the spinal cord was transected between T4 and T5. The animals were immersed up to the axilla in a bathtub of tap-water (CO2 contents: 10–20 mg·l−1) or of CO2-water (965–1,400 mg·l−1) at 35°C while recording HR, arterial blood pressure, and arterial blood gas parameters (PaCO2, PaO2, pH). Arterial blood gas parameters did not change during immersion, irrespective of CO2 concentration of the bath water, whereas the HR was reduced in the CO2-water bath. The inhalation of CO2-mixed gas (5 % CO2, 20 % O2, 75 % N2) resulted in increased levels of blood gases and an increased HR during immersion in all types of water tested. The HR reduction observed in sham transected control animals immersed in CO2-water disappeared after subsequent spinal cord transection. These results show that the dominant afferent signal pathway to the brain, which is involved in inducing the reduced HR during immersion in CO2-water, is located in the neuronal route and not in the bloodstream
Nicotinic acetylcholine receptors in a songbird brain
No full textNicotinic acetylcholine receptors (nAChRs) are ligand-gated ion channels that mediate fast synaptic transmission and cell signaling, which contribute to learning, memory, and the execution of motor skills. Birdsong is a complex learned motor skill in songbirds. Although the existence of 15 nAChR subunits has been predicted in the avian genome, their expression patterns and potential contributions to song learning and production have not been comprehensively investigated. Here, we cloned all the 15 nAChR subunits (ChrnA1-10, B2-4, D, and G) from the zebra finch brain and investigated the mRNA expression patterns in the neural pathways responsible for the learning and production of birdsong during a critical period of song learning. Although there were no detectable hybridization signals for ChrnA1, A6, A9, and A10, the other 11 nAChR subunits were uniquely expressed in one or more major subdivisions in the song nuclei of the songbird brain. Of these 11 subunits, ChrnA3-5, A7, and B2 were differentially regulated in the song nuclei compared with the surrounding anatomically related regions. ChrnA5 was upregulated during the critical period of song learning in the lateral magnocellular nucleus of the anterior nidopallium. Furthermore, single-cell RNA sequencing revealed ChrnA7 and B2 to be the major subunits expressed in neurons of the vocal motor nuclei HVC and robust nucleus of the arcopallium, indicating the potential existence of ChrnA7-homomeric and ChrnB2-heteromeric nAChRs in limited cell populations. These results suggest that relatively limited types of nAChR subunits provide functional contributions to song learning and production in songbirds
A new approach to the digital implementation of analog controllers and continuous-time reference models
No full textIn this thesis, a new approach to the design of digital control systems is introduced. In particular, three new methods are presented, two for the digital redesign of a pre-designed analog control system, and one for the digital implementation of a pre-specified continuous-time reference model.The proposed approach is based on the novel idea of relating digital and analog control systems through their plant-input transfer functions, i.e., the transfer function from the command input to the plant input.The main advantages of the new approach are the guaranteed closed-loop stability for almost all sampling periods, and the recovery of the continuous-time performance when the sampling period approaches zero. The effectiveness of the proposed approach is illustrated by applying it to some famous example, borrowed form other references for the purpose of comparison.The proposed approach is applicable to multi-input multi-output, unstable and non-minimum-phase plants, as long as a suitable analog controller exists. As far as the author of this thesis is aware, such generality is not available with other existing methods.Since discrete-time models of continuous-time transfer functions play an important role in the proposed approach, a new characterization of these models is also present in this thesis
Certain values of Hecke L-functions and generalized hypergeometric functions
No full textAbstractWe compare two calculations due to Bloch and the author of the regulator of an elliptic curve with complex multiplication which is a quotient of a Fermat curve, and express the special value of its L-function at s=0 in terms of special values of generalized hypergeometric functions
Some remarks on field towers arising from pronilpotent universal monodromy representations (Algebraic Number Theory and Related Topics 2012)
No full text"Algebraic Number Theory and Related Topics 2012". December 3～7, 2012. edited by Atsushi Shiho, Tadashi Ochiai and Noriyuki Otsubo. The papers presented in this volume of RIMS Kôkyûroku Bessatsu are in final form and refereed.This article concerns Oda s problem on pronilpotent monodromy representations associated to universal families of curves (called pronilpotent universal monodromy representations for short). In the first half part, we review several known results and their recent applications, and in the second half part, we present some new results obtained by the author
Acute Limb Ischemia does not Facilitate but Inhibits Norepinephrine Release from Muscle Sympathetic Nerve Endings in Anesthetized Rabbit
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