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Online since: September 2016
Authors: S.I. Yaresko, A.V. Sidashov, A.T. Kozakov
It was established that the modification with LO leads to increasing of wear resistance and durability of the R6M5 steel because of a double reduction of the friction coefficient.
According to reference data [13, 18] if peak B has a higher intensity than peak A in Fe M2,3VV Auger spectrum, then there is oxide FeO on the surface.
It should be noted that the data on the chemical state of the iron atoms, obtained by both AES and XPS methods are similar.
Certain differences with the XPS data can be understood and explained if we consider that the XPS data are averaged by a sample area about 10 mm2, and the data of Auger electron spectroscopy refer to an area about 3 microns in diameter.
Sidashov, Segregation Processes and Surface Composition of Certain Alloys and Steels in Oxygen Medium by X-Ray and Auger Electron Data, Ph.D. diss., Rostov-on-Don, 2009
Online since: October 2014
Authors: Xiao Juan Cao, Li Cai Liu, Ni Zhang, Fan Dong Zheng, Bing Hua Li
However, groundwater quality in the southeast of Beijing was subject to change because that aquifer was in relative reduction environment.
Here based on the monitored data, GWHP in five fields were selected to analyze their effects on temperature and quality of groundwater.
In this study, three GWHP with different distances between those wells were selected and changes of groundwater temperature were analyzed according to the monitored data. 2.1Thermal breakthrough Field A was located in piedmont alluvial plain of Beijing.
Monitored data indicated that temperature changes of groundwater and recharged water were steady.
Monitored data showed that increasing dissolved oxygen of groundwater urged to nitration reaction.
Online since: February 2020
Authors: Mun Seok Choe, Dooseuk Choi, Dogyeong Kang
A Study on the Factors Affecting the Uniformity of Urea and Exhaust Gas Using an SCR Simulator Munseok Choe1,a, Dogyeong Kang1,b and Dooseuk Choi2,c* 1Department of Mechanical Engineering, Graduate school, Kongju National University, Korea 2Division of Mechanical & automotive Engineering, Kongju National University, Korea acms0290@kongju.ac.kr, bdogyeong93@smail.kongju.ac.kr, c*dschoi@kongju.ac.kr Keywords: SCR (Selective Catalyst Reduction), NOx, Exhaust system, Mixer, Uniformity index Abstract.
Introduction The fuel consumption of diesel engine is known to have an advantage of about 30 % over that of a gasoline engine as it has a high thermal efficiency and pumping loss reduction effect as it has a higher compression ratio and lean burn can be realized[1].
Also, as PM is known to have a direct effect on human lungs and NOx has a problem of generating ozone or acidic rain, reduction of PM and NOx continue to be an important challenge [4].
An EGR (Exhaust Gas Recirculation) + LNT (Lean NOx Trap) system and a Urea SCR (Selective Catalyst Reduction) system are mostly developed as a plan to satisfy Tier 4, Euro-6 regulation and, to increase NOx reduction efficiency, development should be carryout out by changing the design factors such as the catalyst, mixer and injector in the LNT and SCR systems[5,6].
The SCR system has been designed to constantly maintain the injection pressure of the injector by installing a pump and a pressure regulator and design has been carried out to enable the data to be collected and output in real time by language-coding the control of each sensor and injector signal.
Online since: October 2014
Authors: Thierry Chartier, Pierre Marie Geffroy, Eric Blond, Nicolas Richet, Camille Gazeau, Mickaël Reichmann
This model assumed that the oxygen flux is governed by the association/dissociation of adsorbed oxygen and by the high energetic cost of oxygen reduction/oxidation.
Introduction Due to the increasing need of pure oxygen at high temperature and cost reduction policy in energy industries, catalytic membrane reactors are promising technologies to replace usual cryogenic separation of oxygen form air.
Local hypothesis Thermodynamic balance: - Global reaction OO×+*kS1ex2h∙+O*+ VO× - Reaction mechanism Mathematical relations Dirichlet boundary condition : Neumann boundary condition : Neumann boundary condition: Comparison with experimental data Conclusions Over-estimates the oxygen activity gradient inside the membrane, so overestimates the chemical strains Underestimates the oxygen activity gradient inside the membrane, so underestimates the chemical strains Can reproduce the measures but cannot predict the oxygen permeation fluxes.
The oxidation/reduction reaction describes the charge transfer phenomena.
This model reproduced qualitatively the kinetic difference between oxidation and reduction but it should be refined to obtain quantitative prediction.
Online since: November 2021
Authors: Anil Patil, Umesh J. Tupe, Arun V. Patil
Experimentally, oxygen functional groups can be tuned by adjusting the reduction time, the type of reducing agent and the environment of reduction process.
The obtained values of 2Ɵ were compared with Joint Committee on Powder Diffraction Standards (JCPDS) data files.
According to the JCPDS (75-2078) data the prominent peak is at 2ϴ (26.26).
As the reduction increased the films showed increased porosity.
Chemicals such as H2SO4 if used in synthesis process results in impurities like Sulphur (S) and Phosphorous (P) which remain even after the complete synthesis [30] The available impurity data has been summarized in following table 1.
Online since: December 2012
Authors: Hong Bo Zhao, Cheng Hua Wang, Lin Zhou, Feng Jiang
Experimental Results Experimental Data.
The KDDCUP99 data set contains many continuous attributes.
Pawlak: Rough sets: Theoretical Aspects of Reasoning about Data.
Data Mining, Rough Sets and Granular Computing, T.Y.
Liu: Feature Selection of the Intrusion Detection Data Based on Particle Swarm Optimization and Neighborhood Reduction.
Online since: September 2016
Authors: Thomaz E.T. Buttignol, Matteo Colombo, Marco di Prisco
Two main fibre effects were observed: a significant reduction of irreversible strains when the specimens were loaded and then heated and cooled and a different evolution in LITS passing from 200°C to 400°C, characterized by a significant reduction of the expected deformation.
In order to support high temperatures without loss of data acquisition, the displacements were measured with three LVDTs placed outside the oven and not subjected to high temperatures.
In general, a better prediction was achieved with the introduction of the reduction factor.
From the experimental results, one can notice that the curvature of the experimental LITS compliance (JLITS) curve is modified after 200°C (reduction of LITS growth rate).
· The curvature of the experimental LITS compliance (JLITS) curve is modified after 200°C (reduction of LITS growth rate) and this could be an effect introduced by steel fibres.
Online since: January 2012
Authors: Xiao Dong Zhao, Pei Qiang, Er Liang Chen
The input data of MDOF is stored in the format of spatial data model in GIS with 2D and 3D with the help of Google SketchUp.
GIS Spatial Data Model GIS describes the spatial data model with vector data model and raster data model.
Storage redundancy of vector data model is smaller, and raster data model is based on regular array to represent spatial entities.
This paper organizes data structure as shown in Fig. 4.
Data in ArcGIS and Sketch Up begins with ArcMap and ends with ArcScene[12].
Online since: October 2011
Authors: Qi Zhen Liu, Yan Jing Sun, Fang Wan
Dry basis technology includes selective non-catalytic reduction (SNCR), selective catalytic reduction (SCR) and electron beam desulfurization and denitrification; Semi-dry basis technology includes active carbon desulfurization and denitrification; Wet basis technology includes ozone oxidation and absorption, etc.
(Guan et al., 2004; Liu, 1996) Based on continuous emissions monitoring data, this paper studies on a one-million kW capacity unit with air-fragment low-nitrogen combustion technology combine with SCR and puts forward relevant policies and suggestions for the problems of the application of NOX control technology.
According to the continuous emissions monitoring data, the integrated denitrification efficiency of SCR only amounted to 55% in 2009.
Selective catalytic reduction of fuel gas denitrification technology and its application research in our country, Power environmental protection, Vol.20 (1) (2004),p. 19-21(In Chinese)
Applications of selective catalytic reduction SCR denitrification technology in boilers of power plan,.
Online since: March 2015
Authors: Le Hui Huang, Miao Miao Li
After long-playing research and continuous comparison with historical data, meteorologists recognize that the causes determining the climate state and change don’t exist in the atmosphere, but depend on overall interaction of climate system composed of the air, water, ice, rock, and other several major factors.
Relevant data shows that, if the carbon dioxide concentration increases one time, the average temperature of global surface will rise 1.5~3.5℃.
Reduction or disappearance of vegetation and marine plankton reduces carbon dioxide stored in plants and used for photosynthesis, so as to make the greenhouse gases and global temperature increase further.
Because the forest has these special features in addressing climate change, “Kyoto Protocol” sets two ways: industrial direct reduction and forest indirect reduction.
Energy-saving and emission reduction and climate change also needs the participation of the whole people.
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