アモルファス金属のマイクロ切削加工に関する研究

要約のみTohoku University厨川常元課

Optical-Bias-Controlled and Temperature-Stabilized Electric Field Sensor Using Mach-Zehnder Interferometer

This paper describes an electric field sensor which can control optical bias angle and improve the temperature drift of the sensitivity. The optical bias angle is controlled by applying a suitable stress to the LiNb0 3 substrate, and the temperature drift is reduced by inserting a Si semiconductor layer between the electrode and the Si02 buffer layer. The optical bias angle can be changed from 40[deg.] to 90[deg.], and temperature drift of the insertoin loss is within 2[dB] over a temperature range from O[deg.] to 40[deg.].1994 International Symposium on Electromagnetic Compatibility (EMC\u2794/Sendai), May 16 - 20, 1994, Hotel Sendai Plaza, Miyagi, Japa

Frequency Response Improvement of Electric Field Sensor using Optical Modulator

This paper describes a method of improving the frequency response of an electric field sensor. A modified LiNbO/sub 3/ substrate shape reduces the sensitivity deviation from 4 [dB] to 1 [dB] and the maximum operating frequency is raised from 300 [MHz] to 1 [GHz] by using a resistive loaded element.1994 IEEE Instrumentation and Measurement Technology Conference, May 10-12, 1994, Grand Hotel Hamamatsu, Hamamatsu, Japa

Dark Quest. I. Fast and Accurate Emulation of Halo Clustering Statistics and Its Application to Galaxy Clustering

We perform an ensemble of $N$-body simulations with $2048^3$ particles for 101 flat $w$CDM cosmological models sampled based on a maximin-distance Sliced Latin Hypercube Design. By using the halo catalogs extracted at multiple redshifts in the range of $z=[0,1.48]$, we develop Dark Emulator, which enables fast and accurate computations of the halo mass function, halo-matter cross-correlation, and halo auto-correlation as a function of halo masses, redshift, separations and cosmological models, based on the Principal Component Analysis and the Gaussian Process Regression for the large-dimensional input and output data vector. We assess the performance of the emulator using a validation set of $N$-body simulations that are not used in training the emulator. We show that, for typical halos hosting CMASS galaxies in the Sloan Digital Sky Survey, the emulator predicts the halo-matter cross correlation, relevant for galaxy-galaxy weak lensing, with an accuracy better than $2\%$ and the halo auto-correlation, relevant for galaxy clustering correlation, with an accuracy better than $4\%$. We give several demonstrations of the emulator. It can be used to study properties of halo mass density profiles such as the mass-concentration relation and splashback radius for different cosmologies. The emulator outputs can be combined with an analytical prescription of halo-galaxy connection such as the halo occupation distribution at the equation level, instead of using the mock catalogs, to make accurate predictions of galaxy clustering statistics such as the galaxy-galaxy weak lensing and the projected correlation function for any model within the $w$CDM cosmologies, in a few CPU seconds.Comment: 46 pages, 47 figures; version accepted for publication in Ap

High sensitivity electric field sensor using Mach-Zehnder interferometer

1994 International Symposium on Electromagnetic Compatibility (EMC\u2794/Sendai), May 16 - 20, 1994, Hotel Sendai Plaza, Miyagi, Japa

Method of Estimating Calibration Accuracy for Capacitive Voltage Probe

Capacitive voltage probe (CVP) can measure the common mode disturbance voltages without contact to cables. A common-mode voltage needs to be measured using the calibration unit when a calibration of CVP is carried out. Therefore, the accuracy of calibration should be evaluated, because it is important for an EMC conformity test to confirm validity of a result obtained by CVP. This paper proposes the evaluation method for correction factor of calibration unit using S-parameters. The calibration accuracy was evaluated by the coefficient, αasm that was obtained from S-parameters of the calibration unit. The coefficient was calculated using FDTD method and was measured from 0.1 MHz to 100 MHz to evaluate the proposed method. The results indicated that the deviation between the calculated and measured value is within 0.6 dB from 0.1 to 30MHz. This means that the coefficient, αasm, is effective to evaluate the accuracy. The coefficient, αasm, was also measured using the calibration unit and CVP when a wire radius and a kind of cable were changed. The results indicated that the αasm was within 1 dB from 0.1 MHz to 30 MHz.2009 International Symposium on Electromagnetic Compatibility (EMC\u2709/Kyoto), July 20-24, 2009, Kyoto International Conference Center, Kyoto, Japa