scholarly journals A step beyond in steady-state and time-resolved electro-optical spectroscopy: Demonstration of a customized simple, compact, low-cost, fiber-based interferometer system

2022 ◽  
Vol 9 (1) ◽  
pp. 011101
Author(s):  
Giovanni Pica ◽  
Daniele Bajoni ◽  
Giulia Grancini
Keyword(s):  
Steady State ◽  
Optical Spectroscopy ◽  
Low Cost ◽  
Time Resolved

Scattering delay time of Mie scatterers determined from steady-state and time-resolved optical spectroscopy

2000 ◽  
Vol 17 (4) ◽  
pp. 745
Author(s):  
Stefan Willmann ◽  
Albert Terenji ◽  
Harald Busse ◽  
Ilya V. Yaroslavsky ◽  
Anna N. Yaroslavsky ◽  
...  
Keyword(s):  
Steady State ◽  
Optical Spectroscopy ◽  
Delay Time ◽  
Time Resolved

Steady-State and Time-Resolved Near-Field Optical Spectroscopy of GaN/AlN Quantum Dots and InGaN/GaN Quantum Wells

2002 ◽  
Vol 190 (1) ◽  
pp. 155-160 ◽  
Author(s):  
J. Kudrna ◽  
P.G. Gucciardi ◽  
A. Vinattieri ◽  
M. Colocci ◽  
B. Damilano ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Steady State ◽  
Quantum Wells ◽  
Optical Spectroscopy ◽  
Near Field ◽  
Time Resolved

scholarly journals The M.I.T. Blowdown Compressor Facility

1974 ◽  
Vol 96 (4) ◽  
pp. 394-405 ◽  
Author(s):  
J. L. Kerrebrock ◽  
A. H. Epstein ◽  
D. M. Haines ◽  
W. T. Thompkins
Keyword(s):  
Steady State ◽  
Low Cost ◽  
Pressure Ratio ◽  
Decay Rates ◽  
Test Facility ◽  
Time Resolved ◽  
Transonic Compressor ◽  
Nominal Pressure ◽  
Design Speed ◽  
Steady State Performance

A Blowdown Compressor Test Facility has been developed which allows time resolved aerodynamic testing of full-scale transonic compressor rotors at low cost. The rotor is brought to speed in vacuum, a diaphragm is opened, and the test gas allowed to flow for a time of the order of one tenth sec, during which the rotor is driven by its own inertia. Both “steady-state” performance evaluation and detailed time resolution of the flow on the blade-passing time scale have been demonstrated for a two-ft dia transonic rotor with tangential Mach number of 1.2 and nominal pressure ratio of 1.6. The steady-state performance as determined in the experiments includes an efficiency of 0.92 and a pressure ratio of 1.55 at design speed. The time resolved measurements include the combination tone structure in the upstream flow field, resolved both axially and radially, and the wake structure downstream of the rotor, also resolved both radially and axially. The radial and axial variations of the rms amplitude of a dominant combination tone are found to agree well with duct mode theory, the axial dependence indicating a standing wave. From the wake measurements, preliminary estimates are given of wake spreading and decay rates, in rotor-exit flow fields.

A convenient synthetic approach to obtain meso-Uracil-BODIPY

Synlett ◽  
2021 ◽  
Author(s):  
Mariachiara Trapani ◽  
Hans Elemans ◽  
Maria Angela Castriciano ◽  
Angelo Nicosia ◽  
Placido Giuseppe Mineo ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Steady State ◽  
Low Cost ◽  
Photophysical Properties ◽  
Aldehyde Group ◽  
Synthetic Approach ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Uracil Derivatives ◽  
Convenient Synthetic Approach

An effective and convenient protocol for the synthesis of 1-Substituted-6-formyl-uracil derivatives has been developed. A three-step sequence has allowed obtaining new 6-Formyl uracil with various substituents at N-1, in large quantity using low-cost precursors. Uracil molecules containing an aldehyde group have been used as useful precursors for the preparation of meso-(1’-Substituted-6’-uracil)-BODIPY derivatives. In this way, regioselectively functionalized BODIPYs directly connected to a nucleobase were prepared in yields from 30 to 45%. MALDI-TOF mass spectrometry, NMR, UV-vis absorption, steady-state and time-resolved fluorescence spectroscopies have been used to characterize the structures and the spectroscopic/photophysical properties of the obtained dyes.

scholarly journals Characterization of a Time-Resolved Diffuse Optical Spectroscopy Prototype Using Low-Cost, Compact Single Photon Avalanche Detectors for Tissue Optics Applications

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3680 ◽  
Author(s):  
Mrwan Alayed ◽  
Darek Palubiak ◽  
M. Deen
Keyword(s):  
Optical Properties ◽  
Optical Spectroscopy ◽  
Single Photon ◽  
Low Cost ◽  
Oxide Semiconductor ◽  
Tissue Optics ◽  
Time Resolved ◽  
Instrument Response Function ◽  
Diffuse Optical Spectroscopy ◽  
Compact Size

Time-resolved diffuse optical spectroscopy (TR-DOS) is an increasingly used method to determine the optical properties of diffusive media, particularly for medical applications including functional brain, breast and muscle measurements. For medical imaging applications, important features of new generation TR-DOS systems are low-cost, small size and efficient inverse modeling. To address the issues of low-cost, compact size and high integration capabilities, we have developed free-running (FR) single-photon avalanche diodes (SPADs) using 130 nm silicon complementary metal-oxide-semiconductor (CMOS) technology and used it in a TR-DOS prototype. This prototype was validated using assessments from two known protocols for evaluating TR-DOS systems for tissue optics applications. Following the basic instrumental performance protocol, our prototype had sub-nanosecond total instrument response function and low differential non-linearity of a few percent. Also, using light with optical power lower than the maximum permissible exposure for human skin, this prototype can acquire raw data in reflectance geometry for phantoms with optical properties similar to human tissues. Following the MEDPHOT protocol, the absolute values of the optical properties for several homogeneous phantoms were retrieved with good accuracy and linearity using a best-fitting model based on the Levenberg-Marquardt method. Overall, the results of this study show that our silicon CMOS-based SPAD detectors can be used to build a multichannel TR-DOS prototype. Also, real-time functional monitoring of human tissue such as muscles, breasts and newborn heads will be possible by integrating this detector with a time-to-digital converter (TDC).

scholarly journals Ground- and excited-state characteristics in photovoltaic polymer N2200

RSC Advances ◽  
2021 ◽  
Author(s):  
Guanzhao Wen ◽  
Xianshao Zou ◽  
Rong Hu ◽  
Jun Peng ◽  
Zhifeng Chen ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Excited State ◽  
Steady State ◽  
Excited States ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Time Dependent ◽  
Functional Theory ◽  
Time Resolved ◽  
Dependent Density

Ground- and excited-states properties of N2200 have been studied by steady-state and time-resolved spectroscopies as well as time-dependent density functional theory calculations.

Photophysical properties of N719 and Z907 dyes, benchmark sensitizers for dye-sensitized solar cells, at room and low temperature

2021 ◽  
Vol 23 (10) ◽  
pp. 6182-6189
Author(s):  
Dariusz M. Niedzwiedzki
Keyword(s):  
Solar Cells ◽  
Low Temperature ◽  
Optical Spectroscopy ◽  
Room Temperature ◽  
Photophysical Properties ◽  
Dye Sensitized Solar Cells ◽  
Time Resolved ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Photophysical properties of N719 and Z907, benchmark Ru-dyes used as sensitizers in dye-sensitized solar cells, were studied by static and time-resolved optical spectroscopy at room temperature and 160 K.

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