The Position and Movement on the Solar Disk of Sources of Radiation at a Frequency of 97 Mc/s. I. Equipment

1951 ◽  
Vol 4 (4) ◽  
pp. 489 ◽  
Author(s):  
AG Little ◽  
R Payne-Scott
Keyword(s):  
Interference Pattern ◽  
Short Duration ◽  
Radio Astronomy ◽  
Solar Disk ◽  
Sources Of Error ◽  
Novel Method ◽  
Solar Disturbances

The spaced aerial interference technique, au used in radio astronomy, has been modified in order to observe solar disturbances winch are either of short duration or are rapidly changing in position. The interference pattern is obtained in 1/25 of a second by sweeping the aerial lobe pattern across the source, 25 times per second. The position of the source and the polarization of the radiation are determined separately, a complete record taking about one second. Two different aerial spacings are used and calibration is carried out by a novel method. An equipment operating on 97 Mc/s., which has been used for observations of solar disturbances, is described and the sources of error discussed.

scholarly journals Novel Method Suggests Global Superiority of Short-Duration Antibiotics for Intra-abdominal Infections

2017 ◽  
Vol 65 (9) ◽  
pp. 1577-1579 ◽  
Author(s):  
Arthur R Celestin ◽  
Stephen R Odom ◽  
Konstantia Angelidou ◽  
Scott R Evans ◽  
Raul Coimbra ◽  
...  
Keyword(s):  
Short Duration ◽  
Novel Method ◽  
Abdominal Infections

A Novel Method for Measuring Polyethylene Hip Liner Wear Using a Coordinate Measuring Machine and a Dual Stylus Probe

2016 ◽  
Vol 10 (1) ◽  
Author(s):  
Benjamin P. Cunkelman ◽  
Byoungwook Jang ◽  
Douglas W. Van Citters ◽  
John P. Collier
Keyword(s):  
Data Analysis ◽  
Data Acquisition ◽  
Computer Aided Design ◽  
Ex Vivo ◽  
Coordinate Measuring Machine ◽  
Linear Wear ◽  
Cad Model ◽  
Sources Of Error ◽  
Novel Method ◽  
Measuring Machine

Ex vivo high-resolution measurement of highly crosslinked (HXL) polyethylene hip liner wear is necessary to characterize the in vivo performance of these polymers that exhibit increased wear resistance. Current studies focus on using a coordinate measuring machine (CMM) to acquire data representing the bearing surface(s) of HXL hip liners and use this data to determine linear and volumetric wear. However, these current techniques are subject to error in both data acquisition and data analysis. The purpose of this study was to identify these sources of error and present a novel method for HXL wear measurement that minimizes these contributions to error: our novel methods use a CMM to measure both the articular and backside surfaces of HXL hip liners for subsequent data analysis in Geomagic Control and matlab. Our method involves a vertical orientation of the hip liner to enable one CMM scan of both sides of the hip liner. This method minimizes identified sources of error and proves to be an effective approach for data acquisition of HXL hip liner wear. We also find that our data analysis technique of calculating changes in wall thicknesses is effective in accounting for errors associated with data analysis. Validation of this technique occurred via measurement of two never-implanted HXL hip liners of different sizes (28 mm and 32 mm). In comparing the 32 mm hip liner to its corresponding computer-aided design (CAD) model, we found that our data acquisition technique led to a 0.0019 mm discrepancy between the scanned liner and its CAD model in measured thickness at the pole. We calculated 0.0588 mm and 0.0800 of linear wear for the 28 mm and 32 mm hip liners, respectively, based on our data analysis algorithm. We hypothesize that these reported linear wear values of the never-implanted hip liners are due to machining tolerances of the hip liners themselves.

scholarly journals A novel method of projecting cystic fibrosis birth cohort survival estimates that overcomes short duration of follow-up

2010 ◽  
Vol 9 ◽  
pp. S112
Author(s):  
A. Jackson ◽  
L. Daly ◽  
C. Kelleher ◽  
A.L. Jackson ◽  
M. Harrington ◽  
...  
Keyword(s):  
Cystic Fibrosis ◽  
Birth Cohort ◽  
Short Duration ◽  
Novel Method

Effects in Omega from Propagation Variations

1970 ◽  
Vol 23 (1) ◽  
pp. 49-59 ◽  
Author(s):  
B. Burgess ◽  
D. Walker
Keyword(s):  
World Wide ◽  
Lower Ionosphere ◽  
Mode Propagation ◽  
Sources Of Error ◽  
The Earth ◽  
Multiple Frequencies ◽  
Solar Disturbances ◽  
Marine Navigation ◽  
Multi Mode

This paper discusses some of the variations that occur in the Earth-ionosphere waveguide that can contribute to errors in the Omega lines of position that are used to obtain navigational fixes on a world-wide basis. Effects due to conductivity variations in the Earth's surface, night to day changes in the lower ionosphere, multi-mode propagation, and solar disturbances of the ionosphere are considered and attention is drawn to the use of the multiple frequencies transmitted in the Omega format to overcome some of these sources of error. The paper was presented at a Marine Navigation Symposium held in Sandefjord, Norway, on 24–26 September 1969 and is reproduced with the permission of the organizers. (Crown Copyright, reproduced with the permission of H.M. Stationery Office.)

scholarly journals A Novel Method for Automatic Detection and Classification of Movement Patterns in Short Duration Playing Activities

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 53409-53425 ◽  
Author(s):  
Diego Rivera ◽  
Luis Cruz-Piris ◽  
Susel Fernandez ◽  
Bernardo Alarcos ◽  
Antonio Garcia ◽  
...  
Keyword(s):  
Short Duration ◽  
Movement Patterns ◽  
Automatic Detection ◽  
Novel Method

Control of jet breakup by a superposition of two Rayleigh–Plateau-unstable modes

2014 ◽  
Vol 749 ◽  
pp. 275-296 ◽  
Author(s):  
Theo Driessen ◽  
Pascal Sleutel ◽  
Frits Dijksman ◽  
Roger Jeurissen ◽  
Detlef Lohse
Keyword(s):  
Numerical Simulations ◽  
Interference Pattern ◽  
High Velocity ◽  
Unstable Mode ◽  
Liquid Jet ◽  
Nonlinear Interactions ◽  
Coalescence Process ◽  
Jet Breakup ◽  
Novel Method ◽  
Capillary Tension

AbstractWe experimentally, numerically and theoretically demonstrate a novel method of producing a stream of widely spaced high-velocity droplets by imposing a superposition of two Rayleigh–Plateau-unstable modes on a liquid jet. The wavelengths of the two modes are chosen close to the wavelength of the most unstable mode. The interference pattern of the two superimposed modes causes local asymmetries in the capillary tension. The velocity of the initial droplets depends on these local asymmetries. Due to their different velocities, the droplets coalesce to produce a stream of larger droplets spaced at a much larger distance than the initial droplets. We analytically derive the perturbations that robustly induce this process and investigate the influence of the nonlinear interactions of the two Rayleigh–Plateau-unstable modes on the coalescence process. Experiments and numerical simulations demonstrate that the jet breakup and the subsequent droplet merging are fully governed by the selected modes.

scholarly journals How AI Can Aid Bioethics

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Walter Sinnott-Armstrong ◽  
Joshua (Gus) August Skorburg
Keyword(s):  
Artificial Intelligence ◽  
Moral Judgment ◽  
Hybrid Method ◽  
Moral Judgments ◽  
Test Case ◽  
Top Down ◽  
Moral Issues ◽  
Sources Of Error ◽  
Hybrid Approaches ◽  
Novel Method

This paper explores some ways in which artificial intelligence (AI) could be used to improve human moral judgments in bioethics by avoiding some of the most common sources of error in moral judgment, including ignorance, confusion, and bias. It surveys three existing proposals for building human morality into AI: Top-down, bottom-up, and hybrid approaches. Then it proposes a multi-step, hybrid method, using the example of kidney allocations for transplants as a test case. The paper concludes with brief remarks about how to handle several complications, respond to some objections, and extend this novel method to other important moral issues in bioethics and beyond.

scholarly journals Multi-Field Interference Simultaneously Imaging on Single Image for Dynamic Surface Measurement

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3372
Author(s):  
Weiqiang Han ◽  
Xiaodong Gao ◽  
Zhen Chen ◽  
Le Bai ◽  
Bo Liu ◽  
...  
Keyword(s):  
Time Series ◽  
Interference Pattern ◽  
High Frequency ◽  
Frame Rate ◽  
Surface Measurement ◽  
Imaging Method ◽  
Single Image ◽  
Multiple Reflections ◽  
Dynamic Surface ◽  
Novel Method

To obtain the dynamic surface of high-frequency vibrating mirrors (VMs), a novel method involving multi-field interference (MFI) pattern imaging on a single image is proposed in this paper. Using multiple reflections and refractions, the proposed method generates three interference patterns at the same time, which improves the traditional time-series methods where a single interference pattern can be obtained at one time. Experimental results show that a series of MFI patterns can be obtained on a single image, with the laser repetition frequency (LRF) ranging from 200 Hz to 10 Hz, and the frame rate of the camera at 10 Hz. Particularly if the LRF (10 Hz) is equal to the frame rate of image, crosstalk is avoided completely, which is particularly desirable in dynamic surface measurement. In summary, the MFI imaging method provides an effective way for VM dynamic surface measurement.

A study of cometary eruptions through OH radio-lines

1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró
Keyword(s):  
Short Duration ◽  
Growth Curves ◽  
The Other ◽  
Initial Mass ◽  
Radio Lines ◽  
Other Hand ◽  
Sudden Rise

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.

Computer analysis of side-band holography in STEM

1991 ◽  
Vol 49 ◽  
pp. 684-685
Author(s):  
M.A. Gribelyuk ◽  
J.M. Cowley
Keyword(s):  
Interference Pattern ◽  
Computer Analysis ◽  
Side Band ◽  
Diffraction Plane ◽  
Illumination System ◽  
Probe Size

Recently the use of a biprism in a STEM instrument has been suggested for recording of a hologram. A biprism is inserted in the illumination system and creates two coherent focussed beams at the specimen level with a probe size d= 5-10Å. If one beam passes through an object and another one passes in vacuum, an interference pattern, i.e. a hologram can be observed in diffraction plane (Fig.1).

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