Ammonia dynamic modelling over Cu-SSZ-13 catalyst for NOx emission control in diesel vehicles

2020 ◽  
Vol 5 (9) ◽  
pp. 1824-1832
Author(s):  
Biao Liu ◽  
Dongwei Yao ◽  
Feng Wu ◽  
Xiaohan Hu ◽  
Yuxi Li ◽  
...  
Keyword(s):  
Emission Control ◽  
Dynamic Modelling ◽  
Nox Emission ◽  
Temperature Dependent ◽  
Storage Mechanism ◽  
Site Model ◽  
Model Based ◽  
Diesel Vehicles ◽  
Ammonia Storage ◽  
Dual Site

Based on the ammonia storage mechanism over Cu-SSZ-13 catalyst, a temperature-dependent heterogeneity constant was introduced in the dual-site model, and was compared with traditional dual-site and multi-site model based on a series NH3-TPD tests in this work.

scholarly journals Support vector machine for a diesel engine performance and NOx emission control-oriented model

2020 ◽  
Vol 53 (2) ◽  
pp. 13976-13981
Author(s):  
Masoud Aliramezani ◽  
Armin Norouzi ◽  
Charles Robert Koch
Keyword(s):  
Support Vector Machine ◽  
Diesel Engine ◽  
Emission Control ◽  
Engine Performance ◽  
Nox Emission ◽  
Support Vector

The variational approach to the Glashow–Weinberg–Salam model

1987 ◽  
Vol 65 (4) ◽  
pp. 395-402 ◽  
Author(s):  
R. Manka ◽  
J. Sladkowski
Keyword(s):  
Phase Transition ◽  
Effective Potential ◽  
Variational Approach ◽  
Canonical Quantization ◽  
Temperature Dependent ◽  
Model Based

The variational approach to the Glashow–Weinberg–Salam model, based on canonical quantization, is presented. It is shown that taking into consideration the Becchi–Rouet–Stora symmetry leads to the correct, temperature-dependent, effective potential. This generalization of the Weinberg–Coleman potential leads to a phase transition of the first kind.

WEATHER AND THE ECOLOGY OF APANTELES FUMIFERANAE VIER. (HYMENOPTERA: BRACONIDAE)

1988 ◽  
Vol 120 (S146) ◽  
pp. 57-70 ◽  
Author(s):  
Vincent G. Nealis
Keyword(s):  
Field Data ◽  
Historical Data ◽  
Spruce Budworm ◽  
Temperature Dependent ◽  
Maturation Period ◽  
Phenological Model ◽  
Model Based ◽  
Egg Maturation ◽  
Adult Parasitoid ◽  
Specific Mortality

AbstractThe effects of weather on the spruce budworm parasitoid, Apanteles fumiferanae Vier., are examined. A phenological model based on temperature-dependent rates of development and longevity is developed and validated with field data. The model is then used to explore the effects of age-specific mortality on phenological behaviour of the parasitoid and the seasonal synchrony between the parasitoid and its host over several years. The results show that the parasitoid adult ecloses well before the host reaches an age susceptible to parasitism but that the egg maturation period and the longevity of the parasitoid diminish the consequences of the apparent asynchrony. The historical data reveal that the relative phenological characteristics of A. fumiferanae and its host vary little from year to year. In the second part of the study, temperature is shown to have a strong effect on adult parasitoid activity and on the rate of oviposition.

scholarly journals Modeled and observed ozone sensitivity to mobile-source emissions in Mexico City

2009 ◽  
Vol 9 (1) ◽  
pp. 39-55 ◽  
Author(s):  
M. Zavala ◽  
W. Lei ◽  
M. J. Molina ◽  
L. T. Molina
Keyword(s):  
Mexico City ◽  
Emission Control ◽  
Emission Factors ◽  
Nox Emission ◽  
Base Case ◽  
Mobile Source ◽  
Historical Trends ◽  
Emission Reductions ◽  
Control Policies ◽  
The Past

Abstract. The emission characteristics of mobile sources in the Mexico City Metropolitan Area (MCMA) have changed significantly over the past few decades in response to emission control policies, advancements in vehicle technologies and improvements in fuel quality, among others. Along with these changes, concurrent non-linear changes in photochemical levels and criteria pollutants have been observed, providing a unique opportunity to understand the effects of perturbations of mobile emission levels on the photochemistry in the region using observational and modeling approaches. The observed historical trends of ozone (O3), carbon monoxide (CO) and nitrogen oxides (NOx) suggest that ozone production in the MCMA has changed from a low to a high VOC-sensitive regime over a period of 20 years. Comparison of the historical emission trends of CO, NOx and hydrocarbons derived from mobile-source emission studies in the MCMA from 1991 to 2006 with the trends of the concentrations of CO, NOx, and the CO/NOx ratio during peak traffic hours also indicates that fuel-based fleet average emission factors have significantly decreased for CO and VOCs during this period whereas NOx emission factors do not show any strong trend, effectively reducing the ambient VOC/NOx ratio. This study presents the results of model analyses on the sensitivity of the observed ozone levels to the estimated historical changes in its precursors. The model sensitivity analyses used a well-validated base case simulation of a high pollution episode in the MCMA with the mathematical Decoupled Direct Method (DDM) and the standard Brute Force Method (BFM) in the 3-D CAMx chemical transport model. The model reproduces adequately the observed historical trends and current photochemical levels. Comparison of the BFM and the DDM sensitivity techniques indicates that the model yields ozone values that increase linearly with NOx emission reductions and decrease linearly with VOC emission reductions only up to 30% from the base case. We further performed emissions perturbations from the gasoline fleet, diesel fleet, all mobile (gasoline plus diesel) and all emission sources (anthropogenic plus biogenic). The results suggest that although large ozone reductions obtained in the past were from changes in emissions from gasoline vehicles, currently significant benefits could be achieved with additional emission control policies directed to regulation of VOC emissions from diesel and area sources that are high emitters of alkenes, aromatics and aldehydes.

NOx emission control for automotive lean-burn engines by electro-catalytic honeycomb cells

2012 ◽  
Vol 203 ◽  
pp. 193-200 ◽  
Author(s):  
Ta-Jen Huang ◽  
Chung-Ying Wu ◽  
De-Yi Chiang ◽  
Chia-Chi Yu
Keyword(s):  
Emission Control ◽  
Nox Emission ◽  
Lean Burn

Ambient temperature NOx emission control for lean-burn engines by electro-catalytic tubes

2012 ◽  
Vol 445-446 ◽  
pp. 153-158 ◽  
Author(s):  
Ta-Jen Huang ◽  
Chung-Ying Wu ◽  
De-Yi Chiang ◽  
Chia-Chi Yu
Keyword(s):  
Ambient Temperature ◽  
Emission Control ◽  
Nox Emission ◽  
Lean Burn

22 Nox emission control from a fluidized bed combustor of coal

1980 ◽  
Vol 35 (1-2) ◽  
pp. 170-177 ◽  
Author(s):  
Daizo Kunii ◽  
Kuang Tsai Wu ◽  
Takehiko Furusawa
Keyword(s):  
Fluidized Bed ◽  
Emission Control ◽  
Nox Emission ◽  
Fluidized Bed Combustor
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