Case of spectral emission measurement. 3-8. Spectral emission characteristics of beet.

In this paper, on-road CO, THC, NOX, CO2 gaseous emissions characteristics of china IV CNG bus were analyzed based on on-road vehicle emission test in the peak and non-peak hours of city traffic in Shanghai using a portable emission measurement system (PEMS). The experimental results reveal that: compared with the condition results in the non-peak hours, it (conditions in the peak hours) have lower average speed, longer idle time and shorter high speed time; the NOX emission factor and rate in the peak hour reduced by 5.66% and 70.2%; the CO, HC, CO2 emissions factors are increased by 47.2%, 32.6%, 20.8%, and the CO, HC, CO2 emissions rates reduced by 1.94%, 26.5%, 48.7% respectively, compared with that in the non-peak hours; The CO, HC, NOX, CO2 emissions factors all decreased as bus speed increased, while they increased as bus acceleration increased; the gaseous emissions rates all increased as bus speed increased; both the emissions factors and emissions rates contributions are highest at accelerations, higher at cruise speeds, and the lowest at decelerations for non-idling buses; the emissions rates under the condition of idling is lowest; gaseous emissions contribution under the various operating conditions has displayed certain correlations with the percentage of the time for different operating conditions.

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Quasi-monochromatic spectral emission characteristics from electron collision with tightly focused laser pulses

Laser Physics ◽

10.1088/1555-6611/abe23b ◽

2021 ◽

Vol 31 (3) ◽

pp. 035401

Author(s):

Jiawei Zhuang ◽

Yilv Yan ◽

Xi Zhou ◽

Zujie Chen ◽

Shanling Ren ◽

...

Keyword(s):

Laser Pulses ◽

Electron Collision ◽

Emission Characteristics ◽

Spectral Emission

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Exhaust Emission Characteristics of Excavator With 6.0 Liter Diesel Engine in Real Work Conditions

Volume 2: Emissions Control Systems; Instrumentation, Controls, and Hybrids; Numerical Simulation; Engine Design and Mechanical Development ◽

10.1115/icef2018-9777 ◽

2018 ◽

Author(s):

Sangil Kwon ◽

Sung-Woo Kim ◽

Ki-Ho Kim ◽

Youngho Seo ◽

Mun Soo Chon ◽

...

Keyword(s):

Carbon Monoxide ◽

Diesel Engine ◽

Power Output ◽

Work Conditions ◽

Oxidation Catalyst ◽

Emission Characteristics ◽

Emission Measurement ◽

Emission Analysis ◽

The Real ◽

Real Work

The purpose of this study is evaluate emission characteristics, such as nitrogen oxides (NOx), hydrocarbon, carbon monoxide, and particulate matter (PM), of excavator with Tier-4f level diesel engine in the real work conditions. The test excavator has an engine power of 124 kW at an engine speed of 1800rpm, and it has various after-treatment devices, such as exhaust gas recirculation (EGR), selective catalytic reduction (SCR), and diesel oxidation catalyst (DOC), to reduce the engine-out emissions. The emissions including carbon monoxide (CO), carbon dioxides (CO2), and NOx, were measured by portable emission measurement system (PEMS). The PEMS device conducted a correlation analysis with the emission bench on the engine dynamometer before being used to measure the real-work to confirm the reliability of the equipment. The tests were carried out in four categories: idling, driving, excavations and flattening. It revealed that the average power output for each operation mode was higher in the order of flattening, excavation, and drive. On average, those are higher than that for the non-road transient cycle (NRTC) certification mode as 1.5 to 1.9 times. It may be determined that the power output is higher in conditions where there are more boom and bucket movements than the movement of the vehicle itself. In emission analysis, NOx and HC emission in driving mode are higher than other two modes: excavation and flattening. The real time NOx have been low in most test conditions, but large quantities of NOx have been released due to the deactivation of the SCR catalyst during cold start period or immediately after the non-working.

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Spatiotemporal evolution of the current and the integral and spectral emission characteristics of a negative corona in nitrogen during its transformation into a spark

Plasma Physics Reports ◽

10.1134/1.1825133 ◽

2004 ◽

Vol 30 (11) ◽

pp. 971-982 ◽

Cited By ~ 8

Author(s):

Yu. S. Akishev ◽

G. I. Aponin ◽

V. B. Karal'nik ◽

A. E. Monich ◽

N. I. Trushkin

Keyword(s):

Emission Characteristics ◽

Spectral Emission ◽

Negative Corona ◽

Spatiotemporal Evolution

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