High-resolution room virtualization using first-order source-and-receiver-directional room impulse responses

2018 ◽  
Vol 143 (3) ◽  
pp. 1824-1824
Author(s):  
Franz Zotter ◽  
Franck Zagala ◽  
Markus Zaunschirm ◽  
Matthias Frank
Keyword(s):  
High Resolution ◽  
Impulse Responses ◽  
First Order

HIGH RESOLUTION CALORIMETRIC STUDIES AT PHASE TRANSITIONS OF ALKYLCYANOBIPHENYL LIQUID CRYSTALS CONFINED TO SUBMICRON SIZE CYLINDRICAL CAVITIES

1995 ◽  
Vol 09 (18n19) ◽  
pp. 2247-2283 ◽  
Author(s):  
DANIELE FINOTELLO ◽  
GERMANO S. IANNACCHIONE
Keyword(s):  
Phase Transitions ◽  
Liquid Crystals ◽  
High Resolution ◽  
Specific Heat ◽  
Pore Wall ◽  
Isotropic Phase ◽  
First Order ◽  
Smectic A ◽  
Nematic Director ◽  
Scalar Order Parameter

We review results of a high resolution systematic study of the specific heat for alkyl-cyanobiphenyl liquid crystals confined to the 0.2µm diameter cylindrical pores Anopore membranes. The nematic director alignment at the pore wall is varied from homeotropic to tangential by pore surface treatment. Several phenomena are uncovered by these studies which probed the weakly first order nematic to isotropic, the continuous smectic-A to nematic and the first order smectic-A to isotropic phase transitions. The specific heat is strongly dependent on the nematic director configuration, and confinement effects are remarkably distinct according to the order of the phase transition. The influence of elastic distortions and surface ordering and disordering effects are evident. Despite considerable departures from bulk behavior with regards to specific heat peaks size, rounding and width, and transition temperature shifts, a bulk-like critical behavior appears to be retained. The formation of smectic translational order within the pores is hindered for those liquid crystals that also possess a nematic phase. The average scalar order parameter temperature dependence is extracted from the specific heat results using a simplified Landau-de Gennes type of model, and is shown to be consistent with nuclear magnetic resonance results.

High resolution spectrum of GdO

1976 ◽  
Vol 54 (24) ◽  
pp. 2429-2434 ◽  
Author(s):  
B. R. Yadav ◽  
S. B. Rai ◽  
D. K. Rai
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Visible Emission ◽  
High Resolution Spectrum ◽  
First Order ◽  
Isotopic Shifts ◽  
Vibrational Constants ◽  
Dc Arc

The visible emission spectrum of the GdO molecule has been produced in a DC arc source and has been photographed in the first order of a 10.6 m grating spectrograph. Bands are shown to have a six-headed structure and improved vibrational constants have been obtained in this study. Isotopic shifts have been calculated for the various isotopic molecules. Tentative suggestions regarding the nature of the transition have been made.

scholarly journals Ice XIX: The second hydrogen-ordered polymorph related to ice VI

2020 ◽  
Author(s):  
Tobias Gasser ◽  
Alexander Thoeny ◽  
Andrew Fortes ◽  
Thomas Loerting
Keyword(s):  
High Resolution ◽  
Ambient Pressure ◽  
Structural Models ◽  
Neutron Powder Diffraction ◽  
Ex Situ ◽  
Water Molecules ◽  
Powder Diffraction Data ◽  
Space Groups ◽  
First Order ◽  
Neutron Powder Diffraction Data

Abstract We here report ex situ calorimetry and high-resolution neutron powder diffraction data of a novel ice polymorph produced at 1.8 GPa and recovered to ambient pressure at 80 K. Ice XIX, previously called ice β-XV by us, is shown to be partially hydrogen-ordered and crystallising in a √2 x √2 × 1 supercell with respect to the parent ice VI phase. Our powder data match two nearly degenerate structural models in space-groups \(P\stackrel{-}{4}\) and Pcc2, in which the water molecules are partially antiferroelectrically ordered. Key to the synthesis of deuterated ice XIX is the use of DCl as dopant and the use of a D2O/H2O mixture, where the small H2O fraction nucleates ice XIX. This provides the basis to study the first order-order transition known in ice physics, from ice XIX to its sibling ice XV at ambient pressure. It proceeds via a transition state, ice VI‡, which contains a disordered H-sublattice, whereas both ice XIX and ice XV are fully crystalline.

An inertial piezoelectric hybrid actuator with large angular velocity and high resolution

2019 ◽  
Vol 30 (14) ◽  
pp. 2099-2111 ◽  
Author(s):  
Huilu Bao ◽  
Jianming Wen ◽  
Kang Chen ◽  
Jijie Ma ◽  
Dan Lei ◽  
...  
Keyword(s):  
High Resolution ◽  
Angular Velocity ◽  
Natural Frequencies ◽  
Angular Displacement ◽  
High Accuracy ◽  
Laser Vibrometer ◽  
Type B ◽  
First Order ◽  
Offset Distance ◽  
Hybrid Actuator

This article proposes an inertial piezoelectric actuator with hybrid design of asymmetrically clamping structures and a bias unit for the achievement of large angular velocity and high resolution. To investigate the influence of asymmetrical clamp and bias unit on the driving performance, two types of actuators were fabricated and tested. Combined effects from asymmetrical clamp and bias unit contribute to type A, while their subtractive effect is applied to type B. Using a scanning laser vibrometer, experiments were conducted to analyze the characteristics of the angular displacement and corresponding velocity. It is indicated that the measured first-order natural frequencies for above two types are 13.828 and 14.141 Hz, which agrees well with the simulation results of 16.666 and 17.379 Hz, respectively. Besides, compared with the actuators with simple asymmetrical clamping structure or bias unit, this hybrid actuator can obtain an angular velocity 6.87 rad/s at 80 V and 16 Hz and a resolution of 2.80 μrad under a square signal of 20 V and 1 Hz and an offset distance of −22 mm. As a result, the proposed actuators can achieve large angular velocity and high resolution, which is potentially applicable to quick positioning with high accuracy.

High Resolution Nonreciprocal Microwave Interferometry of Moving Media and Structures

1973 ◽  
Vol 28 (9) ◽  
pp. 1443-1453
Author(s):  
O. Gehre ◽  
H. M. Mayer ◽  
M. Tutter
Keyword(s):  
High Resolution ◽  
Glow Discharge ◽  
Relative Motion ◽  
Wave Length ◽  
Electron Drift ◽  
First Order ◽  
The Third ◽  
Microwave Interferometry ◽  
Moving Media ◽  
The Waves

Three experiments are described in which the relative motion of media or structures causes nonreciprocal effects of first order in ν/c. The first two experiments deal respectively with the Fresnel effect due to the motion of a normal dielectric and the electron drift in the plasma of a glow discharge. The third experiment is a microwave analogon to the historical experiments of Harress, Pogany and Sagnac. To our knowledge these are the first investigations of the well-known effects under conditions where the transverse dimensions of the waves are comparable to the wave length. Under such conditions the nonreciprocal effects when expressed in fringe shifts (or phase angle) remain small. They could, however, be detected after the development of an elaborate microwave interferometry which could resolve fringe shifts down to the order of 10-6.

First-order impacts on winter and summer crops assessed with various high-resolution climate models in the Iberian Peninsula

2007 ◽  
Vol 81 (S1) ◽  
pp. 343-355 ◽  
Author(s):  
María Inés Mínguez ◽  
Margarita Ruiz-Ramos ◽  
Carlos H. Díaz-Ambrona ◽  
Miguel Quemada ◽  
Federico Sau
Keyword(s):  
High Resolution ◽  
Iberian Peninsula ◽  
Climate Models ◽  
First Order

scholarly journals From surface seismic data to reservoir elastic parameters using a full-wavefield redatuming approach

2019 ◽  
Vol 221 (1) ◽  
pp. 115-128 ◽  
Author(s):  
Aayush Garg ◽  
D J Verschuur
Keyword(s):  
High Resolution ◽  
Seismic Data ◽  
Waveform Inversion ◽  
Full Waveform Inversion ◽  
Impulse Responses ◽  
Target Domain ◽  
Elastic Parameters ◽  
Full Waveform ◽  
Parameters Inversion ◽  
Local Input

SUMMARY Traditionally, reservoir elastic parameters inversion suffers from the overburden multiple scattering and transmission imprint in the local input data used for the target-oriented inversion. In this paper, we present a full-wavefield approach, called reservoir-oriented joint migration inversion (JMI-res), to estimate the high-resolution reservoir elastic parameters from surface seismic data. As a first step in JMI-res, we reconstruct the fully redatumed data (local impulse responses) at a suitable depth above the reservoir from the surface seismic data, while correctly accounting for the overburden interal multiples and transmission losses. Next, we apply a localized elastic full waveform inversion on the estimated impulse responses to get the elastic parameters. We show that JMI-res thus provides much more reliable local target impulse responses, thus yielding high-resolution elastic parameters, compared to a standard redatuming procedure based on time reversal of data. Moreover, by using this kind of approach we avoid the need to apply a full elastic full waveform inversion-type process for the whole subsurface, as within JMI-res elastic full waveform inversion is only restricted to the reservoir target domain.

scholarly journals Binaural Rendering with Measured Room Responses: First-Order Ambisonic Microphone vs. Dummy Head

2020 ◽  
Vol 10 (5) ◽  
pp. 1631 ◽  
Author(s):  
Markus Zaunschirm ◽  
Matthias Frank ◽  
Franz Zotter
Keyword(s):  
Decomposition Method ◽  
Angular Resolution ◽  
Impulse Responses ◽  
Dynamic Variable ◽  
First Order ◽  
Spatial Decomposition ◽  
Limited Degree ◽  
Perceptual Characteristics ◽  
Listening Experiment ◽  
Measurement Effort

To improve the limited degree of immersion of static binaural rendering for headphones, an increased measurement effort to obtain multiple-orientation binaural room impulse responses (MOBRIRs) is reasonable and enables dynamic variable-orientation rendering. We investigate the perceptual characteristics of dynamic rendering from MOBRIRs and test for the required angular resolution. Our first listening experiment shows that a resolution between 15 ∘ and 30 ∘ is sufficient to accomplish binaural rendering of high quality, regarding timbre, spatial mapping, and continuity. A more versatile alternative considers the separation of the room-dependent (RIR) from the listener-dependent head-related (HRIR) parts, and an efficient implementation thereof involves the measurement of a first-order Ambisonic RIR (ARIR) with a tetrahedral microphone. A resolution-enhanced ARIR can be obtained by an Ambisonic spatial decomposition method (ASDM) utilizing instantaneous direction of arrival estimation. ASDM permits dynamic rendering in higher-order Ambisonics, with the flexibility to render either using dummy-head or individualized HRIRs. Our comparative second listening experiment shows that 5th-order ASDM outperforms the MOBRIR rendering with resolutions coarser than 30 ∘ for all tested perceptual aspects. Both listening experiments are based on BRIRs and ARIRs measured in a studio environment.

scholarly journals Convergence Improved Lax-Friedrichs Scheme Based Numerical Schemes and Their Applications in Solving the One-Layer and Two-Layer Shallow-Water Equations

2015 ◽  
Vol 2015 ◽  
pp. 1-10
Author(s):  
Xinhua Lu ◽  
Bingjiang Dong ◽  
Bing Mao ◽  
Xiaofeng Zhang
Keyword(s):  
High Resolution ◽  
Shallow Water ◽  
Shallow Water Equations ◽  
Small Time ◽  
Numerical Schemes ◽  
Time Step ◽  
Numerical Diffusion ◽  
First Order ◽  
Small Time Step ◽  
The One

The first-order Lax-Friedrichs (LF) scheme is commonly used in conjunction with other schemes to achieve monotone and stable properties with lower numerical diffusion. Nevertheless, the LF scheme and the schemes devised based on it, for example, the first-order centered (FORCE) and the slope-limited centered (SLIC) schemes, cannot achieve a time-step-independence solution due to the excessive numerical diffusion at a small time step. In this work, two time-step-convergence improved schemes, the C-FORCE and C-SLIC schemes, are proposed to resolve this problem. The performance of the proposed schemes is validated in solving the one-layer and two-layer shallow-water equations, verifying their capabilities in attaining time-step-independence solutions and showing robustness of them in resolving discontinuities with high-resolution.

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