Impact of Catalyst Support Design Parameters on FTP Emissions

1989 ◽  
Author(s):  
L. S. Socha ◽  
J. P. Day ◽  
E. H. Barnett
Keyword(s):  
Catalyst Support ◽  
Design Parameters ◽  
Support Design

scholarly journals Comparative study on bearing mechanism and design parameters of confined concrete arch joints in deep soft rock roadway

2019 ◽  
Vol 6 (4) ◽  
pp. 493-504
Author(s):  
Wei Lu ◽  
Qi Wang ◽  
Bei Jiang ◽  
Shuo Xu ◽  
Bohong Liu ◽  
...  
Keyword(s):  
Failure Modes ◽  
Soft Rock ◽  
Bending Moment ◽  
High Strength ◽  
Internal Force ◽  
Confined Concrete ◽  
Design Parameters ◽  
Support Design ◽  
Soft Rock Roadway ◽  
Rock Roadway

Abstract Square confined concrete arch is increasingly used in deep soft rock roadway support because of its advantages of high strength and construction convenience. However, the design of confined concrete arch in underground engineering still remains in experience-based method and lacks quantitative analysis. As a connecting component between arch sections, the connection joints have an important influence on the internal force distribution and failure mechanism of support arch. Therefore, a reasonable design of arch joints is the premise of rational support design. Taking Liangjia Coal Mine, a typical deep soft rock mine in China, as research background, this paper fully compared the most widely used joint types of confined concrete arch as analytical objects: flange joints and casing joints. The main failure modes of these two kinds of joints under bending moment are defined. Laboratory and numerical tests are carried out to study the mechanical characteristics of joints. Based on the M–θ curve, the influence law of different design parameters is analyzed, and the design principles of joints are proposed. The research results could provide a theoretical basis for the design and application of confined concrete arch in related projects.

scholarly journals Numerical Analysis and Control Study on Surrounding Rock Deformation of Deep Soft Rock Roadway

2021 ◽  
Vol 257 ◽  
pp. 03017
Author(s):  
Enbing Yi
Keyword(s):  
Numerical Analysis ◽  
Plastic Zone ◽  
Large Scale ◽  
Soft Rock ◽  
Design Parameters ◽  
Engineering Practice ◽  
Support Design ◽  
Left And Right ◽  
Soft Rock Roadway ◽  
Rock Roadway

Aiming at the problem of large-scale deformation of the track and alleys in the East Second Mining Area, the numerical analysis method is used to analyze the stress and deformation law of the roadway. The results show that the critical depth of the roadway deformation is 800m, the shear stress of the deep roadway is about 8.7MPa in the left and right shoulders, and the vertical stress increases sharply in the range of 0~5.5m from the center of the roadway, and is 6~ from the center of the roadway. The peak value is reached within 8m, the plastic zone of the roadway roof is 2.6m, the left and right plastic zones are 5.2m and 5.4m, respectively, and the plastic zone of the floor is 6.1m. This result can provide a basis for the design parameters of deep soft rock roadway support. The engineering practice proves that the support design effectively controls the strong deformation of the roadway and achieves better support effect.

scholarly journals Evaluation of Support Structure Removability for Additively Manufactured Ti6Al4V Overhangs via Electron Beam Melting

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1211 ◽  
Author(s):  
Wadea Ameen ◽  
Muneer Khan Mohammed ◽  
Abdulrahman Al-Ahmari
Keyword(s):  
Electron Beam ◽  
Additive Manufacturing ◽  
Process Parameters ◽  
Electron Beam Melting ◽  
Beam Current ◽  
Design Parameters ◽  
Support Structures ◽  
Support Design ◽  
Removal Time ◽  
Scan Speed

The addition of support structures is essential for the successful fabrication of overhang structures through additive manufacturing (AM). The support structures protect the overhang portion from distortions. They are fabricated with the functional parts and are removed later after the fabrication of the AM part. While structures bearing insufficient support result in defective overhangs, structures with excessive support result in higher material consumption, time and higher post-processing costs. The objective of this study is to investigate the effects of design and process parameters of support structures on support removability during the electron beam melting (EBM)-based additive manufacturing of the Ti6Al4V overhang part. The support design parameters include tooth parameters, no support offset, fragmentation parameters and perforation parameters. The EBM process parameters consist of beam current, beam scan speed and beam focus offset. The results show that both support design and process parameters have a significant effect on support removability. In addition, with the appropriate selection of design and process parameters, it is possible to significantly reduce the support removal time and protect the surface quality of the part.

scholarly journals Information Processing and Assessment for Improved Computational Energy Modelling

2021 ◽  
Vol 9 (1) ◽  
pp. 37-49
Author(s):  
Zuhair A Nasar
Keyword(s):  
Parametric Design ◽  
Computational Modelling ◽  
Energy Performance ◽  
Energy Simulation ◽  
Design Parameters ◽  
Prototype Model ◽  
Research Approach ◽  
Main Theme ◽  
Parametric Modelling ◽  
Support Design

This study explores how designer interacts with the computational model. This research intends to demystify how “design knowledge” is obtained, used and processed in the age of computation. The paper shows how the computational modelling tools associated with performance-based parametric design help support design decisions during the initial design phases. Building Energy Performance (BEP) is chosen as the main context to develop a set of criteria for the iterative development, testing, evaluation, and validation of a prototype model. Therefore, as a practical work, the research explores a series of new energy simulation modelling techniques based on parametric design and multi optimization-based design. Specifically, it aims to explore, develop, and test new approaches in parametric modelling that can support energy simulation, using multi optimization, where designers can easily state the design parameters and use them in energy-performance-based design. The exploratory research approach is the main theme of this research. However, during the development of the research it was found that there is a need to blend this research design with the descriptive research approach. One of the key contributions of this study will be the development of a more direct link and useful methods for the translation of information into data inputs to support computational thinking and modelling processes.

scholarly journals An Affordance-based Approach for The Design of Customized Product Non-standard Part

2020 ◽  
Author(s):  
QIU Lemiao ◽  
LI Heng ◽  
YI Guodong ◽  
LIU Xiaojian ◽  
ZHANG Peng ◽  
...  
Keyword(s):  
Integrated Approach ◽  
Design Parameters ◽  
User Requirements ◽  
Force Transmission ◽  
Molding Machine ◽  
Transmission Method ◽  
Support Design ◽  
Detailed Model ◽  
Main Design ◽  
Standard Part

Abstract In this paper we develop an affordance-integrated approach to support design of the customized product non-standard part from conceptual period to detailed period. Firstly, the part affordances are identified by geometrical correlation analysis and shown by liaison graph. Secondly, a force transmission based method is developed to identify the main design parameters of a part, at the same time the design parameters and user requirements both can be mapped into the affordances. In turn, these affordances can be used as a bridge to construct the mapping relationship between the user requirements and the design parameters. In the end, both the force transmission method and the mapping relations are used to construct the detailed model of the non-standard part. A rear platen from the injection molding machine is employed to demonstrate the proposed approach and the result shows that this method can be feasible and useful in product design.

Composite Support Structure of Continuous Arch Internal Support Design and Calculation and Analysis of Engineering Example

2012 ◽  
Vol 204-208 ◽  
pp. 1125-1130 ◽  
Author(s):  
Hong Xia Li ◽  
Yan Qin Guo ◽  
Yong Wei Wang
Keyword(s):  
Design Parameters ◽  
Deep Excavation ◽  
Deep Foundation ◽  
Engineering Applications ◽  
Support Structure ◽  
Support Design ◽  
Composite Support ◽  
Internal Support ◽  
Starting Point ◽  
New Type

Composite support structure of continuous arch internal support is a new type of maintenance structure of deep foundation. In this paper, as the cylindrical shell in the ring uniform load analytical solutions of elasticity a starting point, the design and calculations methods of composite support structure of continuous arch internal supporting are discussed. Engineering examples of composite support structure of continuous arch internal supporting in deep excavation engineering applications are analyzed and summarized. At the same time, the design parameters are provided for more engineering applications.

scholarly journals A Study of Safety Coefficient Determination and Support Parameter Optimization Based on Vulnerability Preevaluation

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Minglei Zhang ◽  
Linsheng Gao ◽  
Yue Yang ◽  
Yidong Zhang ◽  
Ming Ji
Keyword(s):  
Optimization Design ◽  
Design Parameters ◽  
Support Design ◽  
Anchor Bolt ◽  
Safety Coefficient ◽  
Driving Speed ◽  
Mining Project ◽  
Optimizing Design ◽  
The Stability ◽  
The Cost

The preevaluation to the vulnerability of the surrounding rocks is proposed as one of the reliable indicators of the safety coefficient of gateway support and a foundation to optimize the support design parameters. In this study, taking the surrounding rocks, stress, geological environment, and service time into consideration, the safety coefficient is determined based on the vulnerability scores calculated by the vulnerability preevaluation model of the surrounding rock. Applying the safety coefficient to the instability evaluation of the composite rock-bolt bearing structure, the strength required to maintain the stability of the gateway is calculated, which further provides references and guidance to the optimization of the anchor support parameters. This method has been successfully adopted by the GuCheng coal mining project in N1303 tailgate to strengthen the anchor-bolt structure in the roof watering area especially the main inclined shaft. Applying more accurately calculated strength to the anchor-bolt structure can effectively avoid the issue of overcompensation, thus reducing the cost and increasing the driving speed. Furthermore, this method provides insights into optimizing design parameters of the gateway. This method provides a reliable basis for the optimization design of bolt support parameters in coal mine gateway.

The influence of confocal microscope design on imaging performance

1993 ◽  
Vol 51 ◽  
pp. 144-145
Author(s):  
C J R Sheppard
Keyword(s):  
Image Quality ◽  
Fluorescence Imaging ◽  
Confocal Microscope ◽  
Industrial Applications ◽  
Three Dimensions ◽  
Design Parameters ◽  
Weak Signals ◽  
Size And Shape ◽  
Imaging Performance ◽  
Fundamental Limitation

The confocal microscope is now widely used in both biomedical and industrial applications for imaging, in three dimensions, objects with appreciable depth. There are now a range of different microscopes on the market, which have adopted a variety of different designs. The aim of this paper is to explore the effects on imaging performance of design parameters including the method of scanning, the type of detector, and the size and shape of the confocal aperture.It is becoming apparent that there is no such thing as an ideal confocal microscope: all systems have limitations and the best compromise depends on what the microscope is used for and how it is used. The most important compromise at present is between image quality and speed of scanning, which is particularly apparent when imaging with very weak signals. If great speed is not of importance, then the fundamental limitation for fluorescence imaging is the detection of sufficient numbers of photons before the fluorochrome bleaches.

The Design Medan Concert Hall with Metaphor Architecture Approach

2020 ◽  
Vol 4 (1) ◽  
pp. 54-61
Author(s):  
Vinky Rahman ◽  
Muhammad Khairy Humaizy
Keyword(s):  
Secondary Data ◽  
Building Design ◽  
Traditional Music ◽  
Primary Data ◽  
Support Design ◽  
Physical Conditions ◽  
Sound Control ◽  
Strategic Location ◽  
Big City ◽  
Design Ideas

The theater usually has an attractive form to attract the attention of visitors and also has good sound control in the auditorium so as not to cause sound distortion. Performances in Medan are still inadequate to accommodate international performances. Particularly in Medan, the enthusiasm of the community towards art tends to be high, but the facilities of the place lack to accommodate performances. Data collection methods are carried out by collecting primary data through a process of field comparative study and secondary data through literature studies & comparative studies. The design approach used in design studies are analyzing the physical, conditions around the site, potential, the limits that exist on the site, Site and environmental approaches are analysis of site conditions and the best solutions, the user approach is building analysis to meet the need for facilities and quality in accommodating the show, literature studies related to titles and themes and theories that support design ideas. The Metaphor is chosen as a truss design theme to convey the shape of building design by combining metaphorical forms of buildings and the prominence of the same metaphorical theme in the building to those who visit and see buildings to prevent sound distortions by using porous materials. Medan is a big city in Indonesia as a design area with consideration of a strategic location. It is expected that with the presence of this performance center, domestic and foreign tourists and especially Medan people themselves can enjoy the comfort and get to know traditional music and dance in Indonesia.

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