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Online since: August 2017
Authors: Somsak Supasitmongkol, Pathompong Janetaisong, Viset Lailuck
Presence of hydrogen sulfide (H2S) in biogas affects engine performance adversely, thus reducing H2S content is a valuable part in practical application before utilizing biogas.
Many factors affecting the behavior of gas adsorption such as gas in-flow rate, adsorption temperature, binder loadings and textural characteristics were considered.
Effects of parameters on adsorption characteristics were also evaluated along with mechanical strength of pellets.
The Fe3O4-3STR becomes attractive for capturing H2S in terms of adsorption plus strength properties.
It implies that active Fe3O4 sorbent influences the H2S-sorption capacity, whereas the porosity of the pellet affects the kinetics of the sorption/desorption process and remains unchanged at regeneration temperature below its glass transition temperature (Tg).
Many factors affecting the behavior of gas adsorption such as gas in-flow rate, adsorption temperature, binder loadings and textural characteristics were considered.
Effects of parameters on adsorption characteristics were also evaluated along with mechanical strength of pellets.
The Fe3O4-3STR becomes attractive for capturing H2S in terms of adsorption plus strength properties.
It implies that active Fe3O4 sorbent influences the H2S-sorption capacity, whereas the porosity of the pellet affects the kinetics of the sorption/desorption process and remains unchanged at regeneration temperature below its glass transition temperature (Tg).
Online since: March 2016
Authors: Ai Min Wang, Xin Wei Wang, Xiao Long Wang
The conventional energy transfer method for RUM is via slip ring, whereexists mechanical friction and has the potential risk of causing high-voltage discharge and electric sparks.
Moreover the direct-contact electricity transmission cannot work on a spindle rotating in high speed, which affects the machining accuracy and working efficiency of RUM [2].
Fig. 1Contactless power transfer system for RUM Modeling of rotary transformer The behavior of the rotary transformer is mainly determined by two factors: the geometry distribution of the pot core and the winding layout.
The relationship between these two factors is showed in Fig.2.
It can be explained by the material property of the ferrite that it could work with a frequency of 200KHz.
Moreover the direct-contact electricity transmission cannot work on a spindle rotating in high speed, which affects the machining accuracy and working efficiency of RUM [2].
Fig. 1Contactless power transfer system for RUM Modeling of rotary transformer The behavior of the rotary transformer is mainly determined by two factors: the geometry distribution of the pot core and the winding layout.
The relationship between these two factors is showed in Fig.2.
It can be explained by the material property of the ferrite that it could work with a frequency of 200KHz.
Online since: May 2014
Authors: F. García-Vázquez, B. Vargas-Arista, M.A. Gómez-Morales, E. Garfias-García
The ductile-brittle fracture transition is a characteristic well known of behavior from steels, which is influenced by factors as stress state, strain rate, microstructure, grain size and sample size [6].
There are not strength research related with the fractography of fracture surfaces on alloy steels such as SAE E52100 steel to understand the causes and effects of failure due to presence of precipitates on the fracture behavior, mechanical properties degradation and microstructural changes.
Both pins were fully hardened by quenched and tempered to obtain high mechanical and impact resistance.
The size of precipitates could affect the fracture behavior of pins failed.
Dieter, Mechanical Metallurgy, second Ed., McGraw Hill Book Co, United Kingdom, (1988) 471-500
There are not strength research related with the fractography of fracture surfaces on alloy steels such as SAE E52100 steel to understand the causes and effects of failure due to presence of precipitates on the fracture behavior, mechanical properties degradation and microstructural changes.
Both pins were fully hardened by quenched and tempered to obtain high mechanical and impact resistance.
The size of precipitates could affect the fracture behavior of pins failed.
Dieter, Mechanical Metallurgy, second Ed., McGraw Hill Book Co, United Kingdom, (1988) 471-500
Online since: October 2011
Authors: Guy Daculsi, E. Aguado, E. Goyenvalle
Introduction
With regards to their biological and physicochemical properties, PEEK based biomaterials have been successfully used in osteoarticular and maxillofacial surgery [1,2], mainly as endosseous implants.
Clinical success has been achieved not only by the mechanical properties and biocompatibility [3,4] but also by others characteristics such as surface properties.
Surface Roughness is one of the key factors for the osseous integration of orthopaedic and dental titanium implants and can be easy applied to PEEK for osteoconduction improvement.
This sandblasting procedure has been proven to cause a contamination of implant surface which can have unfavourable affects on its bone integration.
The present in vivo study confirms the bioactive property of RBBM blasting to improve the performance of the PEEK implant.
Clinical success has been achieved not only by the mechanical properties and biocompatibility [3,4] but also by others characteristics such as surface properties.
Surface Roughness is one of the key factors for the osseous integration of orthopaedic and dental titanium implants and can be easy applied to PEEK for osteoconduction improvement.
This sandblasting procedure has been proven to cause a contamination of implant surface which can have unfavourable affects on its bone integration.
The present in vivo study confirms the bioactive property of RBBM blasting to improve the performance of the PEEK implant.
Online since: March 2023
Authors: Khairunisa Muthusamy, Mohd Arif Sulaiman, Rokiah Othman, Mohammad Ikhwan Hassan, Hanis Nadiah Ruslan
Pugazhenthi, Mechanical properties of concrete with foundry sand and coconut shell as partial replacement for coarse and fine aggregate, Mat.
Han, Mechanical properties of low-carbon ultrahigh-performance concrete with ceramic tile waste powder, Constr.
Niu, Mechanical properties and permeability of fiber-reinforced concrete with recycled aggregate made from waste clay brick, J.
Budiea, Mechanical properties of oil palm waste lightweight aggregate concrete with fly ash as fine aggregate replacement.
Neville, Properties of Concrete, Fifth ed.
Han, Mechanical properties of low-carbon ultrahigh-performance concrete with ceramic tile waste powder, Constr.
Niu, Mechanical properties and permeability of fiber-reinforced concrete with recycled aggregate made from waste clay brick, J.
Budiea, Mechanical properties of oil palm waste lightweight aggregate concrete with fly ash as fine aggregate replacement.
Neville, Properties of Concrete, Fifth ed.
Online since: December 2012
Authors: Josef Hadipramana, Abdul Aziz Abdul Samad, Noridah Mohammad, Noorwirdawati Ali, Ahmad Mujahid Ahmad Zaidi
Strength characteristic of foamed concrete influenced by many factors such as curing condition, particle size of constituent materials, polypropylene and ratio of concrete materials i.e. sand to cement ratio, water-cement ratio, cement-sand-water ratio.
[4] Kakooei, S., et al., The effects of polypropylene fibers on the properties of reinforced concrete structures.
AtiÅŸ, The durability properties of polypropylene fiber reinforced fly ash concrete.
Ramamurthy, Structure and Properties of Aerated Concrete: A Review.
Afroughsabet, The effects of silica fume and polypropylene fibers on the impact resistance and mechanical properties of concrete.
[4] Kakooei, S., et al., The effects of polypropylene fibers on the properties of reinforced concrete structures.
AtiÅŸ, The durability properties of polypropylene fiber reinforced fly ash concrete.
Ramamurthy, Structure and Properties of Aerated Concrete: A Review.
Afroughsabet, The effects of silica fume and polypropylene fibers on the impact resistance and mechanical properties of concrete.
Online since: January 2012
Authors: Shu Huang, Xiao Jiang Xie, Jian Zhong Zhou, Hong Yan Ruan
Introduction
Film technology is very important for improving the properties of materials.
It can solve the contradictions among the material properties [1,2].
According to the above-mentioned experiments and simulation of μLSP, the RSM was used to analyze the process parameters (laser power density I, laser spot diameter d and the number of shocking n), the three factors were independent and defined as X1, X2 and X3, respectively.
The 3D response surface figure and contour line analysis figure were fitted, and the influence of each two factors on residual stress in TiN film was investigated, shown as in Figs. 6a-c.
In order to seek the best combination of each factors, the regression equation Eq. 1 was treated by the math methods, and the code of variables (X1, X2, X3) was calculated to be (0.93,-0.11,0) according to the extremum equation.
It can solve the contradictions among the material properties [1,2].
According to the above-mentioned experiments and simulation of μLSP, the RSM was used to analyze the process parameters (laser power density I, laser spot diameter d and the number of shocking n), the three factors were independent and defined as X1, X2 and X3, respectively.
The 3D response surface figure and contour line analysis figure were fitted, and the influence of each two factors on residual stress in TiN film was investigated, shown as in Figs. 6a-c.
In order to seek the best combination of each factors, the regression equation Eq. 1 was treated by the math methods, and the code of variables (X1, X2, X3) was calculated to be (0.93,-0.11,0) according to the extremum equation.
Online since: March 2012
Authors: Wei Dong Pan, Ren Guo Gu, Yong Lei Luo, Zheng Bo Hu, Fan Cheng Mao
As is known to all, there are many interference factors in the tunnel advanced detection of TSP, such as holes of poor quality, charge of unseal, the poor coupling relationship of the detection probe, the noise in the hole and so on.
This paper introduces the influence factors and parameter selection of TSP advanced prediction through practices research of TSP advanced prediction in Sheng Ren Moutain tunnel.
If dosage is too big, it will lower detection frequency and detecting resolution, and it will produce huge clutter, affecting the calculating velocity of follow-up to pick up early wave.
When collecting the data by means of TSP advanced prediction, the collection data contains many interference waves and the main frequency is not apparent due to various artificial interference or other interference factors.
Those influencing factor is hard to avoid.
This paper introduces the influence factors and parameter selection of TSP advanced prediction through practices research of TSP advanced prediction in Sheng Ren Moutain tunnel.
If dosage is too big, it will lower detection frequency and detecting resolution, and it will produce huge clutter, affecting the calculating velocity of follow-up to pick up early wave.
When collecting the data by means of TSP advanced prediction, the collection data contains many interference waves and the main frequency is not apparent due to various artificial interference or other interference factors.
Those influencing factor is hard to avoid.
Online since: March 2006
Authors: Nobusuke Hattori, Shinichi Nishida, Yuji Kawakami, Priyo Tri Iswanto
To achieve overall service
performance requirements, higher mechanical and fatigue properties may also need to be considered.
Experimental Procedure The material used in this study is a martensitic stainless steel whose chemical compositions and mechanical properties are listed in Tables 1 and 2, respectively.
Namely, it is considered that compressive mean stress delays crack initiation and suppresses crack propagation properties.
In this case, the notch factor of D10 is 1.165.
Effect of compressive residual stress on fatigue properties improvement of rolled specimens is much higher than that of work-hardening. 4.
Experimental Procedure The material used in this study is a martensitic stainless steel whose chemical compositions and mechanical properties are listed in Tables 1 and 2, respectively.
Namely, it is considered that compressive mean stress delays crack initiation and suppresses crack propagation properties.
In this case, the notch factor of D10 is 1.165.
Effect of compressive residual stress on fatigue properties improvement of rolled specimens is much higher than that of work-hardening. 4.
Online since: December 2012
Authors: Ming Hai Li, Mao Yu Zhen, Xiang Qian Li, Wei Wei Wang
This paper analyzes the errors of two methods to the material properties of a single-layer and a multilayer heavyweight building construction.
CTFs represent the material’s thermal response as determined by its material properties.
Through Laplace inverse transform of interior, cross and exterior transfer functions with unit triangle temperature, response factors and CTFs can be worked out.
Therefore, through the polynomial s-transfer functions, the response factors and CTFs of a multilayer slab are easily and accurately calculated.
For multi-layered slabs, not only material properties, but also layer arrangement influences the CTF calculations.
CTFs represent the material’s thermal response as determined by its material properties.
Through Laplace inverse transform of interior, cross and exterior transfer functions with unit triangle temperature, response factors and CTFs can be worked out.
Therefore, through the polynomial s-transfer functions, the response factors and CTFs of a multilayer slab are easily and accurately calculated.
For multi-layered slabs, not only material properties, but also layer arrangement influences the CTF calculations.