First-time observation of Bessel light beam self-diffraction in heavily doped n-InP

2001 ◽  
Author(s):  
Anatol A. Ryzhevich ◽  
Ilya A. Utkin
Keyword(s):  
Light Beam ◽  
Bessel Light Beam ◽  
Heavily Doped ◽  
Time Observation ◽  
First Time

scholarly journals Using a Bessel light beam as an ultrashort period helical undulator

2017 ◽  
Vol 20 (7) ◽  
Author(s):  
B. C. Jiang ◽  
Q. L. Zhang ◽  
J. H. Chen ◽  
Z. T. Zhao
Keyword(s):  
Light Beam ◽  
Bessel Light Beam

First-time observation of Mastro Giorgio masterpieces by means of non-destructive techniques

2006 ◽  
Vol 83 (4) ◽  
pp. 475-483 ◽  
Author(s):  
G. Padeletti ◽  
G.M. Ingo ◽  
A. Bouquillon ◽  
S. Pages-Camagna ◽  
M. Aucouturier ◽  
...  
Keyword(s):  
Time Observation ◽  
First Time ◽  
Non Destructive ◽  
Non Destructive Techniques

scholarly journals Microfluidic-based imaging of complete C. elegans larval development

2021 ◽  
Author(s):  
Simon Berger ◽  
Silvan Spiri ◽  
Andrew deMello ◽  
Alex Hajnal
Keyword(s):  
Imaging Method ◽  
Cover Glass ◽  
Vulval Development ◽  
C Elegans ◽  
Larval Stages ◽  
Seam Cell ◽  
Time Observation ◽  
On Chip ◽  
First Time

Several microfluidic-based methods for long-term C. elegans imaging have been introduced in recent years, allowing real-time observation of previously inaccessible processes. The ex-isting methods either permit imaging across multiple larval stages without maintaining a stable worm orientation, or allow for very good immobilization but are only suitable for shorter experiments. Here, we present a novel microfluidic imaging method, which allows parallel live-imaging across multiple larval stages, while delivering excellent immobilization and maintaining worm orientation and identity over time. This is achieved by employing an array of microfluidic trap channels carefully tuned to maintain worms in a stable orienta-tion, while allowing growth and molting to occur. Immobilization is supported by an active hydraulic valve, which presses worms onto the cover glass during image acquisition, with the animals remaining free for most of an experiment. Excellent quality images can be ac-quired of multiple worms in parallel, with little impact of the imaging method on worm via-bility or developmental timing. The capabilities of this methodology are demonstrated by observing the hypodermal seam cell divisions and, for the first time, the entire process of vulval development from induction to the end of morphogenesis. Moreover, we demonstrate RNAi on-chip, which allows for perturbation of dynamic developmental processes, such as basement membrane breaching during anchor cell invasion.

Photoluminescence in heavily-doped Si(P)

1978 ◽  
Vol 56 (7) ◽  
pp. 814-826 ◽  
Author(s):  
R. R. Parsons
Keyword(s):  
Photoluminescence Spectrum ◽  
Dopant Concentration ◽  
Impurity Band ◽  
Excitation Level ◽  
Excitation Threshold ◽  
Threshold Behaviour ◽  
Band Emission ◽  
Luminescence Peak ◽  
Heavily Doped ◽  
First Time

The photoluminescence spectrum of heavily doped Si(P) has been studied as a function of temperature, excitation level, and impurity concentration. Several new results are observed for the first time, which include: (i) a narrowing of the impurity band luminescence peak when the temperature is increased to about T = 15 K, (ii) a sudden disappearance of the impurity band emission at a certain temperature determined by the dopant concentration, and (iii) an excitation threshold behaviour for the luminescence observed at high excitation level.A new model is introduced to explain the data. In this model, the impurity band undergoes a localized-to-delocalized transition due to a sufficiently large concentration of photocreated carriers.

scholarly journals KMOS Clusters and VIRIAL GTO Surveys

2014 ◽  
Vol 10 (S309) ◽  
pp. 293-294
Author(s):  
D. Wilman ◽  
R. Bender ◽  
R. L. Davies ◽  
J. T. Mendel ◽  
J. Chan ◽  
...  
Keyword(s):  
Near Infrared ◽  
Early Type ◽  
Dynamical Mass ◽  
Fundamental Plane ◽  
Cluster Galaxies ◽  
Medium Resolution ◽  
Stellar Velocity ◽  
Time Observation ◽  
Field Unit ◽  
First Time

AbstractWe present the KMOS (K-band Multi-Object Spectrograph) Cluster and VIRIAL (VLT IRIFU Absorption Line) Guaranteed Time Observation (GTO) programs. KMOS provides 24 arms each feeding an integral field unit (14×14 spaxels of 0.2″ pixels) for IZ, YJ, H and K band near infrared (NIR) medium resolution spectroscopy (R ∼ 3500). Targets are selected from a 7.2′ diameter patrol field. Ultra-deep spectroscopy of ∼ 80 early-type cluster galaxies (∼ 20hr on source) and ∼ 200 (∼ 10hr on source) early-type field galaxies at 1 < z < 2 will dramatically improve the situation at z > 1 for which measurements of stellar velocity dispersions and absorption indices are limited to a few, often relatively young passively evolving galaxies (e.g. Bezanson 2013). In ESO Periods P92 and P93, 15 nights worth of data has been collected for KMOS-Clusters and 6 nights for VIRIAL: this will be supplemented with more data in upcoming semesters. All galaxies have multiband HST imaging including existing or upcoming WFC3 IR imaging, providing stellar mass maps and sizes. Combined with our dispersion measurements, this will allow us to examine the fundamental plane and the dynamical mass of a large sample of z > 1 galaxies for the first time, for both cluster and field galaxies.

First time observation of local current shrinkage during the MARFE behavior on the J-TEXT tokamak

2017 ◽  
Vol 57 (11) ◽  
pp. 116052
Author(s):  
Peng Shi ◽  
G. Zhuang ◽  
K. Gentle ◽  
Qiming Hu ◽  
Jie Chen ◽  
...  
Keyword(s):  
Local Current ◽  
Time Observation ◽  
First Time

scholarly journals Continuous isotopic composition measurements of tropospheric CO<sub>2</sub> at Jungfraujoch (3580 m a.s.l.), Switzerland: real-time observation of regional pollution events

2010 ◽  
Vol 10 (10) ◽  
pp. 24563-24593 ◽  
Author(s):  
B. Tuzson ◽  
S. Henne ◽  
D. Brunner ◽  
M. Steinbacher ◽  
J. Mohn ◽  
...  
Keyword(s):  
Particle Dispersion ◽  
Integration Time ◽  
High Temporal Resolution ◽  
Research Station ◽  
Mixing Ratios ◽  
Keeling Plot ◽  
Time Observation ◽  
First Time ◽  
Pollution Events

Abstract. A quantum cascade laser based absorption spectrometer (QCLAS) is applied for the first time to perform in situ, continuous and high precision isotope ratio measurements of CO2 in the free troposphere. Time series of the three main CO2 isotopologue mixing ratios (12C16O2, 12C16O2 and 12C18O16O) have simultaneously been measured at one second time resolution over two years (from August 2008 to present) at the High Altitude Research Station Jungfraujoch (3580 m a.s.l., Switzerland). This work focuses on periods in February 2009 only, when sudden and pronounced enhancements in the tropospheric CO2 were observed. These short-term changes were closely correlated with variations in CO mixing ratios measured at the same site, indicating combustion related emissions as potential source. The analytical precision of 0.046‰ (at 50 s integration time) for both δ13C and δ18O and the high temporal resolution allowed the application of the Keeling plot method for source signature identification. The spatial origin of these CO2 emission sources was then determined by backward Lagrangian particle dispersion simulations.

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