Time base evaluation for atom gravimeters

2018 ◽  
Vol 89 (8) ◽  
pp. 083104 ◽  
Author(s):  
Jiafeng Cui ◽  
Yaoyao Xu ◽  
Lele Chen ◽  
Kun Qi ◽  
Minkang Zhou ◽  
...  
Keyword(s):  
Time Base

scholarly journals An extensive photometric study of the Blazhko RR Lyrae star RZ Lyr*

2012 ◽  
Vol 423 (2) ◽  
pp. 993-1005 ◽  
Author(s):  
J. Jurcsik ◽  
Á. Sódor ◽  
G. Hajdu ◽  
B. Szeidl ◽  
Á. Dózsa ◽  
...  
Keyword(s):  
Light Curve ◽  
Light Curves ◽  
Stellar Structure ◽  
Time Base ◽  
Photometric Method ◽  
Physical Parameters ◽  
Component Solution ◽  
Rr Lyrae ◽  
Curve Variation ◽  
Type Variable

Abstract The analysis of recent, extended multicolour CCD and archive photoelectric, photographic and visual observations has revealed several important properties of RZ Lyr, an RRab-type variable exhibiting large-amplitude Blazhko modulation. On the time base of ∼110 yr, a strict anticorrelation between the pulsation- and modulation-period changes is established. The light curve of RZ Lyr shows a remarkable bump on the descending branch in the small-amplitude phase of the modulation, similarly to the light curves of bump Cepheids. We speculate that the stellar structure temporally suits a 4:1 resonance between the periods of the fundamental and one of the higher order radial modes in this modulation phase. The light-curve variation of RZ Lyr can be correctly fitted with a two-modulation-component solution; the 121-d period of the main modulation is nearly but not exactly four times longer than the period of the secondary modulation component. Using the inverse photometric method, the variations in the pulsation-averaged values of the physical parameters in different phases of both modulation components are determined.

Transient analyzer with logarithmic time base

1976 ◽  
Vol 47 (4) ◽  
pp. 445-447 ◽  
Author(s):  
R. H. Austin ◽  
K. W. Beeson ◽  
S. S. Chan ◽  
P. G. Debrunner ◽  
R. Downing ◽  
...  
Keyword(s):  
Time Base

Event-Locked Time-Resolved Fourier Spectroscopy

1997 ◽  
Vol 51 (8) ◽  
pp. 1106-1112 ◽  
Author(s):  
H. Weidner ◽  
R. E. Peale
Keyword(s):  
Signal To Noise Ratio ◽  
Low Cost ◽  
Michelson Interferometer ◽  
Far Infrared ◽  
Time Base ◽  
The Novel ◽  
Time Resolved ◽  
Mathematical Algorithm ◽  
Scan Time ◽  
Recorded Data

A low-cost method of adding time-resolving capability to commercial Fourier transform spectrometers with a continuously scanning Michelson interferometer has been developed. This method is specifically designed to eliminate noise and artifacts caused by mirror-speed variations in the interferometer. The method exists of two parts: (1) a novel timing scheme for synchronizing the transient events under study and the digitizing of the interferogram and (2) a mathematical algorithm for extracting the spectral information from the recorded data. The novel timing scheme is a modification of the well-known interleaved, or stroboscopic, method. It achieves the same timing accuracy, signal-to-noise ratio, and freedom from artifacts as step-scan time-resolving Fourier spectrometers by locking the sampling of the interferogram to a stable time base rather than to the occurrences of the HeNe fringes. The necessary pathlength-difference information at which samples are taken is obtained from a record of the mirror speed. The resulting interferograms with uneven pathlength-difference spacings are transformed into wavenumber space by least-squares fits of periodic functions. Spectra from the far-infrared to the upper visible at resolutions up to 0.2 cm−1 are used to demonstrate the utility of this method.

scholarly journals Usability in 4D AR: Visualising Multi-temporal Real-time Geo-data in Augmented Reality Environments

2015 ◽  
Vol 9 (4) ◽  
pp. 23 ◽  
Author(s):  
Bernd Resch ◽  
Andreas Wichmann ◽  
Nicolas Göll
Keyword(s):  
Augmented Reality ◽  
Real Time ◽  
Temporal Variations ◽  
Time Base ◽  
Future Research ◽  
Time Data ◽  
Orientation Data ◽  
Information Density ◽  
Real Time Data ◽  
Multi Temporal

Even though advantages of 3D visualisation of multi-temporal geo-data versus 2D approaches have been widely proven, the particular pertaining challenge of real-time visualisation of geo-data in mobile Digital Earth applications has not been thoroughly tackled so far. In the emerging field of Augmented Reality (AR), research needs comprise finding the optimal information density, the interplay between orientation data in the background and other information layers, using the appropriate graphical variables for display, or selecting real-time base data with adequate quality and suitable spatial accuracy. In this paper we present a concept for integrating real-time data into 4D (three spatial dimensions plus time) AR environments, i.e., data with “high” spatial and temporal variations. We focus on three research challenges: 1.) high-performance integration of real-time data into AR; 2.) usability design in terms of displaying spatio-temporal developments and the interaction with the application; and 3.) design considerations regarding reality vs. virtuality, visualisation complexity and information density. We validated our approach in a prototypical application and extracted several limitations and future research areas including natural feature recognition, the cross-connection of (oftentimes monolithic) AR interface developments and well-established cartographic principles, or fostering the understanding of the temporal context in dynamic 4D Augmented Reality environments.

The Microstructure of Dual Task Interaction. 2. The Effect of Task Instructions on Attentional Allocation and a Model of Attention-Switching

Perception ◽  
1975 ◽  
Vol 4 (4) ◽  
pp. 459-474 ◽  
Author(s):  
Shirley Fisher
Keyword(s):  
Information Processing ◽  
Dual Task ◽  
Secondary Task ◽  
Active Role ◽  
Time Base ◽  
Main Task ◽  
Time Sharing ◽  
Attention Switching ◽  
Task Instructions ◽  
Criterion Setting

As an extension of an experimental design reported previously the microstructure of dual task interaction was investigated in a condition in which task instructions favoured the task which had previously been designated the secondary task. In the situation explored in this paper subjects worked on the five-choice serial reaction task (designated secondary task) whilst at the same time they received single auditory digits at random time intervals, performed a transform operation (adding seven), and called the answer out into a voice key. The nature of the interaction was investigated using fine analysis of data, and it is argued that the results give further support to the view that subjects were processing information sequentially. A change in the patterning of serial responses in the interval defined by the digit stimulus ( Ds) and the digit response ( Dr) under the changed-instructions condition suggested that individuals are able to play an active role in the ordering of the attention process in sequential processing situations. ‘Process theory’, in which the information processing state of the main task is considered to have a direct influence on the response to the secondary task signal, is argued to be of little use in explaining the data. Two types of explanations based on criterion theory are considered—one which involves criterion setting with respect to a direct time base and one which relies on information processing stage, as an indirect time base. It is argued that the microstructure of dual task interaction should be investigated more closely and that the ordering of the time-sharing process is a skill.

scholarly journals THE STRUCTURE OF THE COLLODION MEMBRANE AND ITS ELECTRICAL BEHAVIOR

1944 ◽  
Vol 27 (5) ◽  
pp. 433-449 ◽  
Author(s):  
Karl Sollner ◽  
Joan Anderman
Keyword(s):  
Solvent Mixture ◽  
Exchange Capacity ◽  
Acid Number ◽  
Electrochemical Activity ◽  
Time Base ◽  
Equivalent Weight ◽  
Base Exchange ◽  
Electrochemically Active ◽  
Organic Solvent Mixture ◽  
High Base

1. The electrochemical behavior ("activity") of collodion membranes depends upon acidic, dissociable groups located in the interstices of the membranes. The active groups can be determined by base exchange measurements. High base exchange capacity is always found with preparations of great "electrochemical activity;" medium and low base exchange capacities occur with electrochemically active as well as with inactive preparations. The observed base exchange capacity is determined by two factors: the inherent acidity of the collodion (its mean equivalent weight) and the submicroscopic micellar structure of the collodion. A comparison of the base exchange capacity of various collodion preparations and their inherent acidities therefore allows certain conclusions to be drawn concerning the relative availability of the micellar surfaces in the different preparations. 2. The inherent acidity of various collodion preparations, their "acid number," was determined by electrometric titration. Collodion in the acidic state, i.e. after exchange of all other cations for H+ ions, was titrated in an organic solvent mixture with alcoholic KOH using a quinhydrone electrode. Details of the experimental procedure are given in the paper. The acid numbers, expressed in milliliters of 0.01 N KOH per gram dry collodion, vary from 1.0 for a highly purified collodion preparation of very low electrochemical activity to 3.3 for a highly oxidized sample of very high activity. Acid numbers of about 1.5 (corresponding to an equivalent weight of about 67,000) are found both with inactive commercial and with fairly active oxidized preparations. The base exchange capacity of the same preparations in the fibrous state as measured after 48 hours of exchange time varies from 0.0013 ml. 0.01 N NaOH per gm. dry collodion for the most inactive preparation up to 0.26 ml. 0.01 N NaOH per gm. for the most active preparation. Thus the acid numbers over the whole range investigated differ only in the ratio of 1:3.3, whereas the base exchange values differ in the range of 1:200. 3. In the inactive preparation only one in 770 acid groups is available for base exchange, in the most active collodion one group in 13; values between these extremes are found with commercial and alcohol purified oxidized preparations. 4. The high base exchange capacity of the electrochemically active preparations is not so much due to their higher acid number as to their more open structure. This difference in structure is ascribed to the presence of a small fraction of low molecular weight material which inhibits normal formation and arrangement of the micelles. 5. Short time base exchange experiments with fibrous collodion indicate that the number of acid groups available for the typical electrochemical membrane functions may be estimated to be about 50 to 1000 times less numerous than those found in the 48 hour base exchange experiments. It is estimated that in membranes prepared even from the most active collodion not more than one in 500 acid groups may be available for the typical membrane functions; with the less active preparations this ratio is estimated to be as high as one in 1,000,000 or more.

scholarly journals Three Observations on Filming Tactility and Movement in Crafts-based Practice

2021 ◽  
Vol 14 (2) ◽  
Author(s):  
Wuon-Gean Ho
Keyword(s):  
Tacit Knowledge ◽  
Real Time ◽  
Point Of View ◽  
Time Base ◽  
Anatomical Position ◽  
The Gaze ◽  
Recording Process

This film makes three observations on the filming of tactility and movement in order to adequately convey tacit knowledge in embodied ways. The author, Wuon-Gean Ho, studied the craft of traditional woodblock printmaking in Japan, and demonstrates planning, carving and printing of a woodblock print. The first observation is that an alteration of the time-base of the film and subsequent manipulation of the soundscape can provide embodied affects. Secondly the film refers to the effect of mirror-touch-synaesthesia with close macro shots and intimate angles. Thirdly, the use of a birds’ eye point of view, with the hands of the artist in the same anatomical position as the viewers’ hands, enables the gaze of the viewer to mimic that of the maker, conveying haptic knowledge through poetic means.The voiceover to the film is made with deliberate reference to ASMR videos that engender a sense of intimacy. The non-objectivity of the recording process is commented upon. The conclusion is that constructed scenarios might convey more than real-time truthful indexical footage.

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