Measurement of the Luminous-Region Profile at the PEP-II Ip, And Application to e>sup<±>/sup<Bunch-Length Determination

2006 ◽  
Author(s):  
B.F. Viaud ◽  
I. Narsky ◽  
W. Kozanecki ◽  
C. O'Grady ◽  
A. Perazzo
Keyword(s):  
Bunch Length ◽  
Luminous Region ◽  
Length Determination

scholarly journals Root canal curvature as a prognostic factor influencing the diagnostic accuracy of radiographic working length determination and postoperative canal axis modification: an in vitro comparative study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Bestoon Mohammed Faraj
Keyword(s):  
Root Canal ◽  
Radiographic Images ◽  
The Real ◽  
Root Canals ◽  
Length Estimation ◽  
Working Length ◽  
Length Determination ◽  
Case Difficulty Assessment ◽  
The Impact

Abstract Background Radiographic analysis of tooth morphology is mandatory for accurate calibration of the degree of canal curvature angle and radiographic working length to its real dimensions in case difficulty assessment protocols. This study aimed to determine the impact of the degree of root canal curvature angle on maintaining the real working length and the original canal axis of prepared root canals using a reciprocating rotary instrumentation technique. Methods Radiographic image analysis was performed on 60 extracted single-rooted human premolar teeth with a moderate canal curvature (10°–25°) and severe canal curvature (26°–70°). Working length and longitudinal canal axis were determined using cone-beam computed tomography (CBCT) and digital periapical radiography. The real canal length was determined by subtracting 0.5 mm from the actual canal length. Root canals were prepared using the WaveOne Gold reciprocating file (Dentsply Maillefer, Ballaigues, Switzerland). Results There was no significant relation of the degree of canal curvature angle to the accuracy of radiographic working length estimated on CBCT and digital periapical radiographic techniques (P > 0.05). Postinstrumentation changes in the original canal axis between moderate and severe canal curvature angles, assessed on CBCT and periapical digital radiographic images were statistically non-significant (P > 0.05). Conclusions A standardized digital periapical radiographic method performed similarly to the CBCT technique near to its true working length. No significant interaction exists between the diagnostic working length estimation, postoperative root canal axis modification, and the degree of canal curvature angle, using reciprocating rotary instrumentation technique.

Minority carrier diffusion length determination from capacitance measurements in Se–CdO photovoltaic cells

1991 ◽  
Vol 69 (3-4) ◽  
pp. 538-542 ◽  
Author(s):  
C. H. Champness ◽  
Z. A. Shukri ◽  
C. H. Chan
Keyword(s):  
Substrate Temperature ◽  
Diffusion Length ◽  
Incident Light ◽  
Photovoltaic Cells ◽  
Minority Carrier Diffusion Length ◽  
Electron Collection ◽  
Straight Line ◽  
Current Change ◽  
Length Determination ◽  
Output Capacitance

In Se–CdO photovoltaic cells, the electron diffusion length Ln in the selenium absorber layer has been determined from measurements of capacitance C and photocurrent under monochromatic illumination by variation of applied reverse bias. If penetrating incident light of band-gap wavelength is used, a plot against 1/C of the illuminated-to-dark current change ΔI yields a straight line over a certain range of bias values. Extrapolation of this line to the 1/C axis yields Ln. It was found in the fabrication of the Se–CdO cells that increasing the substrate temperature from 100 to 140 °C during the selenium deposition resulted in an increase in the cell photovoltaic output. Capacitance and ΔI measurements on these cells showed an increase in diffusion length with substrate temperature, indicating that the increased cell performance was due to improved electron collection in the selenium layer.

scholarly journals Electron bunch length monitors using spatially encoded electro-optical technique in an orthogonal configuration

2009 ◽  
Vol 95 (23) ◽  
pp. 231106 ◽  
Author(s):  
X. Yang ◽  
T. Tsang ◽  
T. Rao ◽  
J. B. Murphy ◽  
Y. Shen ◽  
...  
Keyword(s):  
Electron Bunch ◽  
Bunch Length ◽  
Optical Technique

Radiation Production Using Femtosecond Electron Bunches

2005 ◽  
Vol 107 ◽  
pp. 11-14
Author(s):  
C. Thongbai ◽  
V. Jinamoon ◽  
N. Kangrang ◽  
K. Kusoljariyakul ◽  
S. Rimjaem ◽  
...  
Keyword(s):  
Far Infrared ◽  
Bunch Length ◽  
X Rays ◽  
Research Facility ◽  
X Ray ◽  
Electron Bunches ◽  
Rf Gun ◽  
Intense Radiation ◽  
Far Infrared Radiation ◽  
Femtosecond Electron Bunches

Femtosecond electron bunches can be generated from a system consisting of an RF gun with a thermionic cathode, an alpha magnet, and a linear accelerator and can be used to produce femtosecond (fs) electromagnetic radiation pulses. At the Fast Neutron Research Facility (FNRF), Thailand, we are especially interested in production in Far-infrared (FIR) and x-radiation. In the far-infrared, radiation is emitted coherently for wavelengths which are longer than the electron bunch length, yielding intense radiation. Although, the x-rays emitted are incoherent, its femtosecond time scale is crucial for development of a femtosecond x-ray source.

A Comparison Between Ladell's Wood Section Method and the Macerated Wood Method for Tracheid Length Determination

IAWA Journal ◽  
1983 ◽  
Vol 4 (4) ◽  
pp. 245-247 ◽  
Author(s):  
A. P. Wilkins ◽  
R. K. Bamber
Keyword(s):  
Sample Preparation ◽  
Traditional Method ◽  
Precise Location ◽  
Section Method ◽  
Tracheid Length ◽  
Wood Section ◽  
Length Determination

A comparison has been made between the method of Ladell, in which tangential longitudinal sections are used for the determination of mean tracheid length and the traditional method using macerated wood. The two methods produced identical results. Ladell's method was quicker, enabled precise location of measured cells and required less sample preparation.

Electronic working length determination in primary teeth by Propex and Digital Signal Processing

2010 ◽  
Vol 36 (3) ◽  
pp. 105-108 ◽  
Author(s):  
Paulo Nelson-Filho ◽  
Marcela Pacífico Lucisano ◽  
Mário Roberto Leonardo ◽  
Raquel Assed Bezerra Da Silva ◽  
Léa Assed Bezerra Da Silva
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Primary Teeth ◽  
Digital Signal ◽  
Working Length ◽  
Length Determination

A Metric for Automatic Word-Length Determination of Hardware Datapaths

2006 ◽  
Vol 25 (10) ◽  
pp. 2228-2231 ◽  
Author(s):  
M.-A. Cantin ◽  
Y. Savaria ◽  
Prodanos ◽  
P. Lavoie
Keyword(s):  
Word Length ◽  
Length Determination

scholarly journals Coherent Smith-Purcell radiation for minimally invasive bunch length measurement at the subpicosecond time scale

2021 ◽  
Vol 24 (4) ◽  
Author(s):  
Philipp Heil ◽  
Kurt Aulenbacher ◽  
Christoph Matejcek ◽  
Simon Friederich ◽  
Max Bruker ◽  
...  
Keyword(s):  
Minimally Invasive ◽  
Time Scale ◽  
Length Measurement ◽  
Bunch Length
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