scholarly journals From benzene to naphthalene: direct measurement of reactions and intermediates of phenyl radicals and acetylene

2019 ◽  
Vol 21 (40) ◽  
pp. 22248-22258 ◽  
Author(s):  
Te-Chun Chu ◽  
Zachary J. Buras ◽  
Mica C. Smith ◽  
Awele B. Uwagwu ◽  
William H. Green
Keyword(s):  
Time Evolution ◽  
Direct Measurement ◽  
Time Measurement ◽  
Phenyl Radicals ◽  
Dependent Model ◽  
First Time

First-time measurement of time evolution of the main products and critical intermediates on phenyl HACA pathways with a validated pressure-dependent model.

First time measurement of gamma-ray excited LaBr3:5% Ce3+and LaCl3:10% Ce3+temperature dependent properties

2006 ◽  
Vol 203 (5) ◽  
pp. R41-R43 ◽  
Author(s):  
G. Bizarri ◽  
J. T. M. de Haas ◽  
P. Dorenbos ◽  
C. W. E. van Eijk
Keyword(s):  
Gamma Ray ◽  
Time Measurement ◽  
Temperature Dependent ◽  
Temperature Dependent Properties ◽  
First Time

The Decay of 169Yb

1972 ◽  
Vol 50 (19) ◽  
pp. 2348-2354 ◽  
Author(s):  
S. K. Sen ◽  
D. L. Salie ◽  
E. Tomchuk
Keyword(s):  
Direct Measurement ◽  
Gamma Rays ◽  
Internal Conversion ◽  
Gamma Ray ◽  
Conversion Coefficient ◽  
Coulomb Excitation ◽  
Internal Conversion Coefficient ◽  
Electron Capture Decay ◽  
Upper Limits ◽  
First Time

The decay of 169Yb was investigated using several Ge(Li) detectors of different sizes. The following gamma rays (energies in keV and intensities within brackets) were definitely identified with the 169Yb decay: 20.7 (0.66 ± 0.04), 63.1 (124 ± 5), 93.6 (7.2 ± 0.3), 109.8 (50 ± 2), 117.3 (0.08 ± 0.04), 118.2 (5.4 ± 0.2), 130.5 (34 ± 2), 156.7 (0.023 ± 0.004), 177.2(59 ± 3), 198.0 (100), 240.4 (0.33 ± 0.02), 261.0 (4.7 ± 0.2), and 307.7 (28 ± 1). The recently reported weak gamma-ray peaks at 515 (0.008 ± 0.002) and 625 (0.010 ± 0.002) were also observed and could not be ruled out as not belonging to 169Yb. The recently reported gamma-ray peaks at 140, 160, 207, 288, 295, 316, 320, 328, 355, 371, 379, 396, and 417 were detected and shown not to be from the decay of 169Yb while those at 218, 229, 285, 304, 335, 388, 411, and 425 were not observed and upper limits were placed on their intensities. The presence of very weak peaks at 515 and 625 establishes the formation of the 633 keV state of 169Tm following electron capture decay of 169Yb as reported by George. (This level has been previously observed only in Coulomb excitation of 169Tm.) The total internal conversion coefficient for the 20.7 keV transition was determined for the first time from the direct measurement of the gamma-ray intensity as 51 ± 10 corresponding to an M1 transition.

Wearable microfluidics: fabric-based digital droplet flowmetry for perspiration analysis

Lab on a Chip ◽  
2017 ◽  
Vol 17 (5) ◽  
pp. 926-935 ◽  
Author(s):  
Yahui Yang ◽  
Siyuan Xing ◽  
Zecong Fang ◽  
Ruya Li ◽  
Helen Koo ◽  
...  
Keyword(s):  
Real Time ◽  
Continuous Flow ◽  
Time Measurement ◽  
Flow Rates ◽  
Microfluidic Platform ◽  
Textile Materials ◽  
Real Time Measurement ◽  
First Time ◽  
Electronic Counting

Here we show for the first time a wearable microfluidic platform, named as digital droplet flowmetry (DDF), implemented on all-textile materials for real-time measurement of perspiration rates, via converting continuous flow into discrete droplets with identical volumes and assessing the flow rates by an electronic counting circuitry.

scholarly journals Real-Time Measurement of Dynamic Wheel-Rail Contacts Using Ultrasonic Reflectometry

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Lu Zhou ◽  
Henry Brunskill ◽  
Martin Pletz ◽  
Werner Daves ◽  
Stephan Scheriau ◽  
...  
Keyword(s):  
Real Time ◽  
Linear Measurement ◽  
Time Measurement ◽  
Contact Condition ◽  
Cross Sectional ◽  
Contact Patch ◽  
Rail Network ◽  
Real Time Measurement ◽  
First Time ◽  
Contact Predictions

The contact condition between the wheel and the rail is paramount to the lifespan, safety, and smooth operation of any rail network. The wheel/rail contact condition has been estimated, calculated, and simulated successfully for years, but accurate dynamic measurement has still not been achieved. Methods using pressure-sensitive films and controlled air flow have been employed, but both are limited. The work described in this paper has enabled, for the first time, the measurement of a dynamic wheel/rail contact patch using an array of 64 ultrasonic elements mounted in the rail. Previous work has successfully proved the effectiveness of ultrasonic reflectometry for static wheel/rail contact determination. The dynamic real-time measurement is based on previous work, but now each element of an array is individually pulsed in sequence to build up a linear measurement of the interface. These cross-sectional, line measurements are then processed and collated resulting in a two-dimensional contact patch. This approach is able to provide not only a contact patch, but more importantly, a detailed and relatively high-resolution pressure distribution plot of the contact. Predictions using finite element methods (FEM) have also been carried out for validation. Work is now underway to increase the speed of the measurement.

scholarly journals Multi-frequency scatter-broadening evolution of pulsars

2017 ◽  
Vol 13 (S337) ◽  
pp. 364-365
Author(s):  
M. A. Krishnakumar ◽  
Bhal Chandra Joshi ◽  
P. K. Manoharan
Keyword(s):  
Time Scales ◽  
Radio Telescope ◽  
Time Measurement ◽  
Turbulence Spectrum ◽  
Kolmogorov Type ◽  
Large Sample ◽  
The Galaxy ◽  
Scattering Strength ◽  
First Time ◽  
Scaling Index

AbstractIn this paper, we present our study on multi-frequency scatter-broadening observations of a large sample of pulsars, made using the Ooty Radio Telescope (ORT) and the Giant Metrewave Radio Telescope (GMRT). For each pulsar, the scatter-broadening time scales (τsc) have been estimated at different observing frequencies and the dependence of τsc with the observing frequency, i.e., the frequency scaling index (α) has been obtained. We report estimates of α for a set of 39 pulsars, of which 31 are completely new and provide the first-time measurement on about 50% of the sample. This enhanced sample suggests that almost 65% of the pulsars have an α much lower than the conventional value of 4.4 for a Kolmogorov type turbulence spectrum, and a considerably large scattering strength. An increase in scattering strength is observed with the distance to the pulsar in the Galaxy.

scholarly journals Measuring the oxygen content of a single oil droplet

2016 ◽  
Vol 7 (10) ◽  
pp. 6458-6462 ◽  
Author(s):  
Ann Feng ◽  
Wei Cheng ◽  
Richard G. Compton
Keyword(s):  
Real Time ◽  
Oxygen Content ◽  
Time Measurement ◽  
Oxygen Carriers ◽  
Oil Droplet ◽  
Real Time Measurement ◽  
Artificial Oxygen Carriers ◽  
The Individual ◽  
Individual Droplet ◽  
First Time

Using toluene droplets as a model for artificial oxygen carriers, the real-time measurement of attomole oxygen contents at the individual droplet level is reported for the first time.

Photoconducting Properties of Ultraviolet Detectors Based on GaN and Al1-xGaxN Films Grown by ECR-MBE

1996 ◽  
Vol 449 ◽  
Author(s):  
M. Misra ◽  
D. Korakakis ◽  
R. Singh ◽  
A. Sampath ◽  
T. D. Moustakas
Keyword(s):  
Direct Measurement ◽  
Microwave Power ◽  
Response Times ◽  
Spectral Response ◽  
Alpha Particles ◽  
Detector Response ◽  
Photoconductive Gain ◽  
Ultraviolet Detectors ◽  
Transmission Measurements ◽  
First Time

ABSTRACTGaN and All-xGaxN films were grown by the method of ECR-MBE. Absorption constants as a function of wavelength were determined from transmission measurements. Photoconducting detectors were fabricated from these films and characterized in terms of their spectral response and photoconductive gain. Mobility-lifetime products were determined from the measurement of photoconductive gain. The resistivity and mobility-lifetime products of the films were varied from 10-109 ohm-cm and 10-3 -10-8 cm2/V respectively by changing the microwave power in the ECR discharge from 20-60 watts. The change in the mobility-lifetime product is attributed to change in the lifetimes of the photogenerated carriers. This assumption is supported by direct measurement of detector response times. Finally, we report for the first time, the detection of alpha particles using GaN detectors.

QUANTUM STOCHASTIC LIOUVILLE EQUATION OF ITO TYPE

1993 ◽  
Vol 07 (29n30) ◽  
pp. 1951-1959 ◽  
Author(s):  
T. SAITO ◽  
T. ARIMITSU
Keyword(s):  
Time Evolution ◽  
Liouville Equation ◽  
Canonical Formalism ◽  
Mathematical Foundation ◽  
Unified Framework ◽  
Stochastic Liouville Equation ◽  
Stochastic Fields ◽  
Thermo Field Dynamics ◽  
First Time ◽  
Stochastic Time

The quantum stochastic Liouville equation of Ito type is derived, for the first time, within Nonequilibrium Thermo Field Dynamics (NETFD), a unified canonical formalism for dissipative and/or stochastic fields. With the stochastic time-evolution generator of Ito type, the whole framework is inspected. Since most of the mathematical formulations of noncommutative stochastic variables are based on the equations of Ito type, the construction of the quantum stochastic Liouville equation has been highly desired. It is expected that the unified framework may provide us with a deeper insight for the mathematical foundation of quantum stochastic variables as well as for the physical one.

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