Study of the Mainlobe Misorientation of the First-Order Steerable Differential Array in the Presence of Microphone Gain and Phase Errors

2014 ◽  
Vol 21 (6) ◽  
pp. 667-671 ◽  
Author(s):  
Xiaoguang Wu ◽  
Huawei Chen ◽  
Jianjiang Zhou ◽  
Tianwen Guo
Keyword(s):  
First Order ◽  
Phase Errors

scholarly journals Reduction the effects of opamp finite gain and offset voltage in LDI termination with a minus one half delay of SC ladder filters

2006 ◽  
Vol 3 (1) ◽  
pp. 45-54 ◽  
Author(s):  
Nikolay Radev ◽  
Kantcho Ivanov
Keyword(s):  
Combined Approach ◽  
First Order ◽  
Op Amp ◽  
Phase Errors ◽  
Offset Voltage ◽  
Dc Gain ◽  
Gain Errors ◽  
Finite Gain ◽  
Discrete Integrator

In this paper a combined approach for reducing the effects of op amp imperfections (finite gain A and offset voltage VOS) in first-order SC cell, realizing LDI (loss less discrete integrator) termination with a minus one half delay is presented. First, the conventional integrator is replaced with gain- and offset-compensated (GOC) integrator. Next, the gain errors m(?) and the phase errors ?(?) are further reduced by using the precise op amp gain approach in the GOC structure. The variation of the dc gain A from its nominal value A0 is taken into account.

Phase Compensation in Multi-Pulse N.M.R. Experiments

1973 ◽  
Vol 28 (7) ◽  
pp. 1081-1089 ◽  
Author(s):  
P. Mansfield ◽  
U. Haeberlen
Keyword(s):  
Absorption Line ◽  
General Scheme ◽  
Pulse Sequences ◽  
Phase Control ◽  
Pulse Response ◽  
Phase Compensation ◽  
Alignment Procedure ◽  
First Order ◽  
Phase Errors ◽  
Phase Alignment

A general scheme is described for self correcting the various coherent phase errors that arise in multi-pulse sequences used for artificial narrowing of the absorption line in solids. The scheme is found to work well experimentally and greatly facilitates the phase alignment procedure by reducing the sensitivity of the multi-pulse response to phase control settings and drifts. First order dipolar terms reintroduced into the average Hainiltonian by the phase errors are also discussed.

Properties of Acoustical Speckle in the Presence of Phase Aberration Part I: First Order Statistics

1988 ◽  
Vol 10 (1) ◽  
pp. 12-28 ◽  
Author(s):  
Gregg E. Trahey ◽  
Stephen W. Smith
Keyword(s):  
Tissue Characterization ◽  
Imaging System ◽  
Focal Point ◽  
Phase Error ◽  
Random Phase ◽  
Statistical Properties ◽  
First Order ◽  
Phase Errors ◽  
Speckle Patterns ◽  
Phase Aberrations

The first order statistical properties of acoustical speckle patterns are studied as a function of several types of random and structured phase error. Such errors may arise from tissue velocity inhomogeneities or limitations in the acoustical imaging system. In this paper, we review the theory describing the statistical properties of speckle, describe a computer model which predicts the mean speckle brightness in the presence of phase aberrations, and report experiments in which we measure the effect of these aberrations on speckle brightness and variance. We find that the average speckle brightness is significantly reduced by even mild phase aberrations. The phase aberrations studied include focal point errors, random phase errors, and structured errors. Good agreement is found between experiment and computer simulation. We then discuss the implications of these results for imaging through aberrating media, tissue characterization and phase compensation methods.

Dual systems for all: Higher-order, role-based relational reasoning as a uniquely derived feature of human cognition

2019 ◽  
Vol 42 ◽  
Author(s):  
Daniel J. Povinelli ◽  
Gabrielle C. Glorioso ◽  
Shannon L. Kuznar ◽  
Mateja Pavlic
Keyword(s):  
Temporal Reasoning ◽  
Higher Order ◽  
Important Case ◽  
Human Cognition ◽  
Relational Reasoning ◽  
Dual Systems ◽  
First Order ◽  
Reasoning System ◽  
Role Based

Abstract Hoerl and McCormack demonstrate that although animals possess a sophisticated temporal updating system, there is no evidence that they also possess a temporal reasoning system. This important case study is directly related to the broader claim that although animals are manifestly capable of first-order (perceptually-based) relational reasoning, they lack the capacity for higher-order, role-based relational reasoning. We argue this distinction applies to all domains of cognition.

Stochasting modeling of planetary ring systems

1984 ◽  
Vol 75 ◽  
pp. 461-469 ◽  
Author(s):  
Robert W. Hart
Keyword(s):  
Maximum Entropy ◽  
Ring System ◽  
The Sun ◽  
Ultimate State ◽  
Interparticle Interactions ◽  
Ring Systems ◽  
First Order ◽  
Planetary Ring ◽  
Insight Into

ABSTRACTThis paper models maximum entropy configurations of idealized gravitational ring systems. Such configurations are of interest because systems generally evolve toward an ultimate state of maximum randomness. For simplicity, attention is confined to ultimate states for which interparticle interactions are no longer of first order importance. The planets, in their orbits about the sun, are one example of such a ring system. The extent to which the present approximation yields insight into ring systems such as Saturn's is explored briefly.

Morphological studies of linear (AB)n multiblock copolymers and their blends

1992 ◽  
Vol 50 (1) ◽  
pp. 384-385
Author(s):  
Richard J. Spontak ◽  
Steven D. Smith ◽  
Arman Ashraf
Keyword(s):  
Electron Microscopy ◽  
Microphase Separation ◽  
Multiblock Copolymers ◽  
First Order ◽  
Morphological Studies ◽  
Transmission Electron ◽  
First Order Phase Transition ◽  
Covalently Bonded ◽  
Total Molecular Weight ◽  
First Order Phase

Block copolymers are composed of sequences of dissimilar chemical moieties covalently bonded together. If the block lengths of each component are sufficiently long and the blocks are thermodynamically incompatible, these materials are capable of undergoing microphase separation, a weak first-order phase transition which results in the formation of an ordered microstructural network. Most efforts designed to elucidate the phase and configurational behavior in these copolymers have focused on the simple AB and ABA designs. Few studies have thus far targeted the perfectly-alternating multiblock (AB)n architecture. In this work, two series of neat (AB)n copolymers have been synthesized from styrene and isoprene monomers at a composition of 50 wt% polystyrene (PS). In Set I, the total molecular weight is held constant while the number of AB block pairs (n) is increased from one to four (which results in shorter blocks). Set II consists of materials in which the block lengths are held constant and n is varied again from one to four (which results in longer chains). Transmission electron microscopy (TEM) has been employed here to investigate the morphologies and phase behavior of these materials and their blends.

Exact First Order Finite Element Modeling for Eddy Current NDE

1991 ◽  
Vol 3 (1) ◽  
pp. 235-253 ◽  
Author(s):  
L. D. Philipp ◽  
Q. H. Nguyen ◽  
D. D. Derkacht ◽  
D. J. Lynch ◽  
A. Mahmood
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Eddy Current ◽  
Element Modeling ◽  
First Order ◽  
Eddy Current Nde

Challenging the Multidimensional Conception of Perceived Person-Environment Fit

2020 ◽  
pp. 1-9
Author(s):  
Julian M. Etzel ◽  
Gabriel Nagy
Keyword(s):  
Higher Education ◽  
University Students ◽  
Educational Outcomes ◽  
Factor Model ◽  
Higher Order ◽  
Substantial Proportion ◽  
Unique Variance ◽  
First Order ◽  
Person Environment Fit ◽  
Order Factor

Abstract. In the current study, we examined the viability of a multidimensional conception of perceived person-environment (P-E) fit in higher education. We introduce an optimized 12-item measure that distinguishes between four content dimensions of perceived P-E fit: interest-contents (I-C) fit, needs-supplies (N-S) fit, demands-abilities (D-A) fit, and values-culture (V-C) fit. The central aim of our study was to examine whether the relationships between different P-E fit dimensions and educational outcomes can be accounted for by a higher-order factor that captures the shared features of the four fit dimensions. Relying on a large sample of university students in Germany, we found that students distinguish between the proposed fit dimensions. The respective first-order factors shared a substantial proportion of variance and conformed to a higher-order factor model. Using a newly developed factor extension procedure, we found that the relationships between the first-order factors and most outcomes were not fully accounted for by the higher-order factor. Rather, with the exception of V-C fit, all specific P-E fit factors that represent the first-order factors’ unique variance showed reliable and theoretically plausible relationships with different outcomes. These findings support the viability of a multidimensional conceptualization of P-E fit and the validity of our adapted instrument.

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