A Spatial-resolved Spectroscopic Measurements of PD Phenomena in SF6 Gas and Effects of N2 Gas Addition to SF6 Gas on the High Sensitive Light Emission Measurement

2013 ◽  
Vol 133 (4) ◽  
pp. 186-191
Author(s):  
Yuki Yamaguchi ◽  
Shinya Ohtsuka
Keyword(s):  
Light Emission ◽  
Emission Measurement ◽  
Spectroscopic Measurements

A Study of HCCI Combustion Characteristics by Using Light Emission and Absorption Spectroscopy

2011 ◽  
Author(s):  
Akira Iijima ◽  
Koji Yoshida ◽  
Hideo Shoji
Keyword(s):  
Air Temperature ◽  
Light Absorption ◽  
Octane Number ◽  
Light Emission ◽  
Activity Level ◽  
Oxidation Reactions ◽  
Temperature Oxidation ◽  
Cool Flame ◽  
Spectroscopic Measurements ◽  
Residual Gas

Light emission and absorption spectroscopic measurements of chemical species were made to investigate the effects of the fuel octane number, residual gas state and intake air temperature on the ignition characteristics of a Homogeneous Charge Compression Ignition (HCCI) engine. The results revealed that the activity level of low-temperature oxidation reactions and the tendency for autoignition to occur can be ascertained by making simultaneous spectroscopic measurements of light emission and absorption at wavelengths corresponding to those of formaldehyde (HCHO). The measured results showed that light absorption attributable to HCHO and faint light emission occur coincidentally with the cool flame. Once the cool flame degenerates, light absorption and emission are moderated. Absorbance declines sharply when autoignition occurs, indicating the consumption of HCHO. Increasing the octane number, raising the intake air temperature and increasing the residual gas fraction all have the effect of weakening the absorbance and light emission intensity of HCHO at the time the cool flame occurs, thereby lengthening the interval from the cool flame to autoignition.

scholarly journals Calibration of an Autonomous Instrument for Monitoring Light Pollution from Drones

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5091 ◽  
Author(s):  
Pietro Fiorentin ◽  
Carlo Bettanini ◽  
Damiano Bogoni
Keyword(s):  
Light Emission ◽  
Imaging System ◽  
Spectral Power ◽  
Light Emitting Diode ◽  
Light Flux ◽  
Ground Level ◽  
Horizontal Resolution ◽  
Light Pollution ◽  
Light Sources ◽  
Emission Measurement

The paper presents the calibration activity on the imaging system of the MINLU instrument, an autonomous sensor suite designed for monitoring light pollution using commercial off-the-shelf components. The system is extremely compact and with an overall mass below 3 kg can be easily installed as a payload for drones or sounding balloons. Drones and air balloons can in fact play an important role in completing upward light emission measurement from satellites allowing an increased spatial and time resolution from convenient altitudes and positions. The proposed system can efficiently measure the luminous intensity and the spectral power density of on-ground emissions providing a useful tool to identify polluting sources and to quantify upward light flux. The metrological performance of the imaging system has been verified through an extensive laboratory test activity using referenced light sources: the overall uncertainty of the multi-luminance meter has been calculated to be 7% of the reading, while the multi-spectrometer has shown a full width at half maximum (FWHM) equal to 10 nm within the measuring range between 400 nm and 700 nm. When operating at an altitude of 200 m, the system can achieve a horizontal resolution at a ground level of 0.12 m with a wavelength resolution able to identify the different lamp technology of outdoor light sources, including light-emitting diode (LED) lights that are undetected by satellites.

Combustion Analysis of Preflame Reaction Light Emission Behavior by Using Light Emission Measurement

2005 ◽  
Author(s):  
Tsuyoshi Suzuki ◽  
Takaki Itaya ◽  
Daisuke Kadowaki ◽  
Koji Yoshida ◽  
Hideo Shoji
Keyword(s):  
Light Emission ◽  
Emission Measurement ◽  
Combustion Analysis ◽  
Emission Behavior

An Analysis of Preflame Reaction under Knocking in Spark Ignition Engine Using Light Emission Measurement

2004 ◽  
Vol 2004.10 (0) ◽  
pp. 539-540
Author(s):  
Takashi SASAGAWA ◽  
Akihiro KAKISHIMA ◽  
Tsuyoshi SUZUKI ◽  
Koji YOSHIDA ◽  
Hideo SHOJI
Keyword(s):  
Light Emission ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Emission Measurement

Renilla Bioluminescence: A Morphologic Approach to the Location of Photocytes

1974 ◽  
Vol 32 ◽  
pp. 208-209
Author(s):  
Ben O. Spurlock ◽  
Milton J. Cormier
Keyword(s):  
Excited State ◽  
Ground State ◽  
Molecular Basis ◽  
Light Emission ◽  
Chemical Basis ◽  
Electronic Excited State ◽  
Colonial Form ◽  
The Common ◽  
Eighteenth And Nineteenth Centuries ◽  
Catalyzed Oxidation

The phenomenon of bioluminescence has fascinated layman and scientist alike for many centuries. During the eighteenth and nineteenth centuries a number of observations were reported on the physiology of bioluminescence in Renilla, the common sea pansy. More recently biochemists have directed their attention to the molecular basis of luminosity in this colonial form. These studies have centered primarily on defining the chemical basis for bioluminescence and its control. It is now established that bioluminescence in Renilla arises due to the luciferase-catalyzed oxidation of luciferin. This results in the creation of a product (oxyluciferin) in an electronic excited state. The transition of oxyluciferin from its excited state to the ground state leads to light emission.

Scanning luminescence x-ray microscopy: Progress toward selective staining using microspheres

1994 ◽  
Vol 52 ◽  
pp. 74-75
Author(s):  
C. Jacobsen ◽  
J. Fu ◽  
S. Mayer ◽  
Y. Wang ◽  
S. Williams
Keyword(s):  
Visible Light ◽  
Active Sites ◽  
Light Emission ◽  
Chinese Hamster ◽  
Polystyrene Spheres ◽  
Good Resistance ◽  
X Ray ◽  
Selective Staining ◽  
Visible Light Emission ◽  
Specific Labelling

In scanning luminescence x-ray microscopy (SLXM), a high resolution x-ray probe is used to excite visible light emission (see Figs. 1 and 2). The technique has been developed with a goal of localizing dye-tagged biochemically active sites and structures at 50 nm resolution in thick, hydrated biological specimens. Following our initial efforts, Moronne et al. have begun to develop probes based on biotinylated terbium; we report here our progress towards using microspheres for tagging.Our initial experiments with microspheres were based on commercially-available carboxyl latex spheres which emitted ~ 5 visible light photons per x-ray absorbed, and which showed good resistance to bleaching under x-ray irradiation. Other work (such as that by Guo et al.) has shown that such spheres can be used for a variety of specific labelling applications. Our first efforts have been aimed at labelling ƒ actin in Chinese hamster ovarian (CHO) cells. By using a detergent/fixative protocol to load spheres into cells with permeabilized membranes and preserved morphology, we have succeeded in using commercial dye-loaded, spreptavidin-coated 0.03μm polystyrene spheres linked to biotin phalloidon to label f actin (see Fig. 3).

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