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Online since: September 2013
Authors: Mohd Nurazzi Norizan, Ahmad Faiza Mohd, Wan Zain Norazira, Mohamed Rahmah
Tread hardness or softness at low temperatures is the major factor in determining ice traction properties.
The tested rubber compounds indicated that curing characteristics with different blend system affected the strength performance.
Optimum cure = ( tmax- tmin)0.90 + tmin (1) tmax: Maximum temperature tmin: Minimum temperature Mechanical properties.
Strong interaction of aromatic oil with rubber were achieved as aromatic oil has high C-H content and its physical and chemical properties of PAHs are determined by their conjugated p-electron systems.
Due to better performance obtained from various testing performed, it revealed that EO and AO have their own strength properties.
The tested rubber compounds indicated that curing characteristics with different blend system affected the strength performance.
Optimum cure = ( tmax- tmin)0.90 + tmin (1) tmax: Maximum temperature tmin: Minimum temperature Mechanical properties.
Strong interaction of aromatic oil with rubber were achieved as aromatic oil has high C-H content and its physical and chemical properties of PAHs are determined by their conjugated p-electron systems.
Due to better performance obtained from various testing performed, it revealed that EO and AO have their own strength properties.
Online since: March 2025
Authors: Wasan R. Saleh, Fuad T. Ibrahim, Salma M. Hassan, Aqeel Y. Taradh
Conductive polymers (CPs) are organic substances that possess mechanical and physical properties similar to traditional polymers, as well as the special electrical properties of metals.
Classes can be classified based on their properties, sizes, and shapes.
Due to changes in the surface of the manufactured composite, a particular mixture can yield good properties of one gas and poor properties of another [9].
[4] Pang, A.L., Arsad, A. and Ahmadipour, M., Synthesis and factor affecting on the conductivity of polypyrrole: a short review.
[6] Khan, I., Saeed, K. and Khan, I., Nanoparticles: Properties, applications and toxicities.
Classes can be classified based on their properties, sizes, and shapes.
Due to changes in the surface of the manufactured composite, a particular mixture can yield good properties of one gas and poor properties of another [9].
[4] Pang, A.L., Arsad, A. and Ahmadipour, M., Synthesis and factor affecting on the conductivity of polypyrrole: a short review.
[6] Khan, I., Saeed, K. and Khan, I., Nanoparticles: Properties, applications and toxicities.
Online since: May 2012
Authors: Chao Xiang Li, Ai Feng Hu
Problems which flow controlling devices and injection mouths were unfit for multi-end surface cast, would directly affect the casting quality.
The sink flow was also an important factor in nonmetallic inclusions.
This flow had the mechanical properties which separated and floated the inclusions.
The sink flow was also an important factor in nonmetallic inclusions.
This flow had the mechanical properties which separated and floated the inclusions.
Online since: March 2010
Authors: Ze Yu Weng, Nan Nan Zhang, Yong Cai, Jin Hua Yang, Wei Hua Yuan
Experimental Modal Analysis of CNC High Precision Surface Grinder
with Horizontal Spindle and Rotary Table MGK7350
Yong Cai1,a, Zeyu Weng
1,b
, Nannan Zhang1,c
, Jinhua Yang2,d, Weihua Yuan3,e
1
Key Laboratory of Mechanical Manufacture and Automation of Ministry of Education,
Hangzhou Zhejiang 310014, China;
2
Hangzhou Dalu Industry Corporation, Xiaoshan,Hangzhou 311234, Zhejiang, China
3
Hangzhou Machine Tool Group Corporation, Hangzhou Zhejiang 310022, China
a
zjut_cy@163.com,
b
Wengzy@mail.hz.zj.cn, czn5148534@126.com
d
HDLRONGGE112@163.com, eywh7511@yahoo.com.cn
Keywords: Modal analysis, Modal test, Modal sharp, Weak link
Abstract:The dynamic characteristic of CNC high precision surface grinder with horizontal spindle
and rotary table MGK7350 was studied by using modal test.
And the working performance and cutting efficiency of machine tools are closely related to its dynamic characteristics which will directly affect machining quality and machining efficiency of machine tools.
Currently, it has become a important indicator to measure structure and properties of machine tool.
(4) Where prφ = mode sharp factor of point P of mode r, ( )pf jω = the incentive at point P.
And the working performance and cutting efficiency of machine tools are closely related to its dynamic characteristics which will directly affect machining quality and machining efficiency of machine tools.
Currently, it has become a important indicator to measure structure and properties of machine tool.
(4) Where prφ = mode sharp factor of point P of mode r, ( )pf jω = the incentive at point P.
Online since: July 2024
Authors: Zu Jian Huang, Yang Zhao
The correlation is found to be affected by the construction types.
For all the four types of construction model groups, the curve similarity factors between the HRY-RHe and CWS model groups f2(HRY-CWS) of Hdehumid.sum and RHi.mean are 49.66-51.11 and 76.43-82.99, respectively, which are higher than the 38.47-40.45 and 60.43-65.11 of the f2(Meteo-CWS), and 41.28-46.66 and 60.05-65.12 of the f2(epw-CWS) (Fig. 3).
For the M/H groups, the moisture content of the exterior walls is more affected by the rainfall.
Experimental study on bamboo hygrothermal properties and the impact of bamboo-based panel process.
Assessment on bamboo scrimber as a substitute for timber in building envelope in tropical and humid subtropical climate zones - Part 1 hygrothermal properties test. 2017 International Conference on Building Materials and Materials Engineering, Lyon, France (2017)
For all the four types of construction model groups, the curve similarity factors between the HRY-RHe and CWS model groups f2(HRY-CWS) of Hdehumid.sum and RHi.mean are 49.66-51.11 and 76.43-82.99, respectively, which are higher than the 38.47-40.45 and 60.43-65.11 of the f2(Meteo-CWS), and 41.28-46.66 and 60.05-65.12 of the f2(epw-CWS) (Fig. 3).
For the M/H groups, the moisture content of the exterior walls is more affected by the rainfall.
Experimental study on bamboo hygrothermal properties and the impact of bamboo-based panel process.
Assessment on bamboo scrimber as a substitute for timber in building envelope in tropical and humid subtropical climate zones - Part 1 hygrothermal properties test. 2017 International Conference on Building Materials and Materials Engineering, Lyon, France (2017)
Online since: December 2024
Authors: Azlinda Azizi, Rozana Azrina Sazali, Kenneth Stuart Sorbie, Nur Batrisyia Razman Shah, Munawar Khalil
The amount of electrostatic repulsion that exists between particles and the thickness of the diffuse electrical layer are the two factors that determine the degree to which a nanoparticle is stable.
The stability and dispersion of the solution were determined by measuring the zeta potential properties of the solution by using Zetasizer from Malvern Panalytical.
Graphene oxide features oxygen-containing groups like carboxyl, hydroxyl, and epoxy, attached to both the flat surfaces (basal planes) and edges of its graphene sheets, this unique structure results in a higher presence of sp3 hybridized carbon atoms compared to sp2, granting GO distinct mechanical, chemical, and optical properties [15].
Manivannan, “Synthesis, Characterization and Gas Sensing Properties of Graphene Oxide-Multiwalled Carbon Nanotube Composite,” J.
Asnan et al., “Surfactant-bound fe3 o4 nanoparticles as catalyst support: Synthesis and physicochemical properties,” Malaysian J.
The stability and dispersion of the solution were determined by measuring the zeta potential properties of the solution by using Zetasizer from Malvern Panalytical.
Graphene oxide features oxygen-containing groups like carboxyl, hydroxyl, and epoxy, attached to both the flat surfaces (basal planes) and edges of its graphene sheets, this unique structure results in a higher presence of sp3 hybridized carbon atoms compared to sp2, granting GO distinct mechanical, chemical, and optical properties [15].
Manivannan, “Synthesis, Characterization and Gas Sensing Properties of Graphene Oxide-Multiwalled Carbon Nanotube Composite,” J.
Asnan et al., “Surfactant-bound fe3 o4 nanoparticles as catalyst support: Synthesis and physicochemical properties,” Malaysian J.
Online since: July 2011
Authors: Xin Wang, Zhi Jun Zhang
Simulation of Flow Field and Temperature Tield in the Process of Filling and Solidification for K424 Alloy Thin-walled Casting
Xin Wang 1,a, Zhijun Zhang 2,b
1Academy of Human Sports Science in Shenyang Physical Education Institute, Liaoning Shenyang, China,110102;
2Institute of Mechanical Engineering and Automation in Northeastern University, Liaoning Shenyang, China, 110004;
ashin_wang@163.com, b working_zhang@163.com
Key words: K424 alloy; thin-section casting; flow field simulation; temperature field simulation
Abstract: In order to improve the utilization of K424 alloy, Z-Cast analysis software is used to get three-dimensional flow field and temperature coupling simulation in the process of K424 alloy castings filling, by considering the effection of pouring temperature, casting speed, shell thermal conductivity and temperature on the morphology of filling.
In the process of filling the mold, the molten metal stop flow when filling calculated to 53% ,and the time is0.718s;After the improvement of process program , the flowing front has arched shape only in the beginning moment of filling, then showed a steady advance form, and the temperature gradient is small, the total filling time is 0.863s.Can be seen from the figure of simulation results, the casting process has great impact on the flowing property of the alloy when the shell material is definite.
Although the surface of the liquid metal rise steadily, it will affect the filling effect of thin-wall casting, resulting in the phenomenon of misrun.
The temperature fall nearly 100°C when the down sprue is instinct with liquid metal, and when filled from sprue to casting, the fall of temperature is more than200°C, which close to the solidification temperature, so solidification happened inside the casting before the casting has been filled, this will affect the subsequent inflow of liquid metal and result in the phenomenon of misrun and cold shut.
After improving the casting speed and shuttering temperature, the temperature of liquid metal has not reached liquid line in the end of mold filling, so the solid-phase does not happen in the thin-section casting, and there will not happen the phenomenon of solidification in some parts of the casting to affect the injection of the follow-up liquid metal which result in the defect of misrun.
In the process of filling the mold, the molten metal stop flow when filling calculated to 53% ,and the time is0.718s;After the improvement of process program , the flowing front has arched shape only in the beginning moment of filling, then showed a steady advance form, and the temperature gradient is small, the total filling time is 0.863s.Can be seen from the figure of simulation results, the casting process has great impact on the flowing property of the alloy when the shell material is definite.
Although the surface of the liquid metal rise steadily, it will affect the filling effect of thin-wall casting, resulting in the phenomenon of misrun.
The temperature fall nearly 100°C when the down sprue is instinct with liquid metal, and when filled from sprue to casting, the fall of temperature is more than200°C, which close to the solidification temperature, so solidification happened inside the casting before the casting has been filled, this will affect the subsequent inflow of liquid metal and result in the phenomenon of misrun and cold shut.
After improving the casting speed and shuttering temperature, the temperature of liquid metal has not reached liquid line in the end of mold filling, so the solid-phase does not happen in the thin-section casting, and there will not happen the phenomenon of solidification in some parts of the casting to affect the injection of the follow-up liquid metal which result in the defect of misrun.
Online since: June 2007
Authors: Takanori Kiguchi, Naoki Wakiya, Kazuo Shinozaki, Nobuyasu Mizutani, Ji Won Moon, Shogo Tazawa, Youhei Ishida
However, in
the case of PbTiO3 seeds, remanent polarizations (2Pr) were about 10 µC/cm2, this means that it
needs higher process temperature to obtain a good electrical properties for PbTiO3 seeds.
These suggest that SrTiO3 is expected to be a good seed layer for PZT with better electrical properties.
The effects of source supply method between MOCVDs of PZT films on the crystallization and electrical properties of PZT films are also investigated.
The electrical properties were measured by preparing 100µm diameter Pt top electrodes with 30nm thickness on the PZT films at room temperature.
Results and Discussion In this experiment, in order to investigate the effect of ferroelectric properties of PZT thin films grown on SrTiO3 seeds, SrTiO3 seeds were prepared at various deposition temperatures from 400 to 600 o C.
These suggest that SrTiO3 is expected to be a good seed layer for PZT with better electrical properties.
The effects of source supply method between MOCVDs of PZT films on the crystallization and electrical properties of PZT films are also investigated.
The electrical properties were measured by preparing 100µm diameter Pt top electrodes with 30nm thickness on the PZT films at room temperature.
Results and Discussion In this experiment, in order to investigate the effect of ferroelectric properties of PZT thin films grown on SrTiO3 seeds, SrTiO3 seeds were prepared at various deposition temperatures from 400 to 600 o C.
Online since: April 2008
Authors: Kang Chun Luo, Bin Xu, Bai Yang Lou
Introduction
The surface properties of machine parts and tools, such as strength, hardness, wear resistance
and corrosion resistance, can be improved by chemical heat treatments which have been researching
actively in recent years.
The Cr-Ti coating is a kind of diffusion alloying methods by which surface properties of metal, such as strength, hardness, wear resistance and corrosion resistance, are strengthen [5,6].
The surface properties of Cr-Ti coating depend mainly on the structure of compound layer outside the costing.
The major factor that influences atom-diffusing ability is diffusing temperature here.
Chromizing-Titanizing Layer and Its Wear Behavior, China Surface Engineering, Vol.19(2006),p.19 [6] ZHANG Jian-Bin and LI Shi-yan, Microstructure and Properties of B-RE-Cr Coboronising Layer for Steel 45, Microstructure and Properties of B-RE-Cr Coboronising Layer for Steel 45, Mining and Metallurgical Engineering, Vol.24(2004),p.78 [7] RUAN Xia, XI Hui-zhi and XU Zhe, The study of Cr-Ti-Ce and Al-Ti-Ce penetration to 4Cr_(10)Si_2Mo valve steel, Applied Science and Technology,Vol.33(2006),p.25
The Cr-Ti coating is a kind of diffusion alloying methods by which surface properties of metal, such as strength, hardness, wear resistance and corrosion resistance, are strengthen [5,6].
The surface properties of Cr-Ti coating depend mainly on the structure of compound layer outside the costing.
The major factor that influences atom-diffusing ability is diffusing temperature here.
Chromizing-Titanizing Layer and Its Wear Behavior, China Surface Engineering, Vol.19(2006),p.19 [6] ZHANG Jian-Bin and LI Shi-yan, Microstructure and Properties of B-RE-Cr Coboronising Layer for Steel 45, Microstructure and Properties of B-RE-Cr Coboronising Layer for Steel 45, Mining and Metallurgical Engineering, Vol.24(2004),p.78 [7] RUAN Xia, XI Hui-zhi and XU Zhe, The study of Cr-Ti-Ce and Al-Ti-Ce penetration to 4Cr_(10)Si_2Mo valve steel, Applied Science and Technology,Vol.33(2006),p.25
Online since: January 2017
Authors: Maria Luigia Muolo, Alberto Passerone, Fabrizio Valenza
The contact angle is influenced by many external factors such as the presence of molecules adsorbed on the surfaces for instance.
Consequently, as shown in Figs. 10, the penetration of the weld bead changes radically, as does its morphology and therefore its mechanical properties [46-48].
Scott Weil, Effects of CuO Content on the Wetting Behavior and Mechanical Properties of a Ag-CuO Braze for Ceramic Joining, J.
Li, General trends in electronic structure, stability, chemical bonding and mechanical properties of ultrahigh temperature ceramics TMB2 (TM=transition metal), J.
Jia, Microstructure and mechanical properties of ZrB2-SiC joints fabricated by contact-reactive brazing technique with Ti and Ni interlayers, Ceram.
Consequently, as shown in Figs. 10, the penetration of the weld bead changes radically, as does its morphology and therefore its mechanical properties [46-48].
Scott Weil, Effects of CuO Content on the Wetting Behavior and Mechanical Properties of a Ag-CuO Braze for Ceramic Joining, J.
Li, General trends in electronic structure, stability, chemical bonding and mechanical properties of ultrahigh temperature ceramics TMB2 (TM=transition metal), J.
Jia, Microstructure and mechanical properties of ZrB2-SiC joints fabricated by contact-reactive brazing technique with Ti and Ni interlayers, Ceram.