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Online since: January 2003
Authors: Balázs Verő, Mihály Réger, Gábor Fehérvári
In a broader sense, however, the quantified value of any factor that affects the process can
be regarded as a parameter.
Another major factor affecting shell thickness and liquid pool length is overheating.
In cases of solidification ending in columnar dendrites or a very small zone of equiaxed dedritic zone, excessive segregation results in compromised mechanical parameters at the places that solidified last.
The chemical analysis of carbon and sulfur content, as well as the evaulation of metallographic structure and mechanical properties (by tensile and impact testing) in these points would be done for verification of the program.
Another major factor affecting shell thickness and liquid pool length is overheating.
In cases of solidification ending in columnar dendrites or a very small zone of equiaxed dedritic zone, excessive segregation results in compromised mechanical parameters at the places that solidified last.
The chemical analysis of carbon and sulfur content, as well as the evaulation of metallographic structure and mechanical properties (by tensile and impact testing) in these points would be done for verification of the program.
Online since: March 2008
Authors: Di Zhu, Yang Yang Hu, Yong Bin Zeng, Ping Mei Ming
Experimental Research on Microelectroforming with Ultrasonic Agitation
Pingmei Ming1,2,a
, Di Zhu
2,b
, Yangyang Hu2,b and Yongbin Zeng2,b
1
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, China
2
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and
Astronautics, Nanjing, China
a
mpm@hpu.edu.cn; bDZhu@nuaa.edu.cn
Keywords: Microelectroforming, Ultrasonic agitation, Microdevices, Surface topography
Abstract.
Ultrasonic agitation or vibration of electrode (anodes or cathode) is frequently considered to solve the problem of mass transport limitation during electrodeposition of metals within deep, high-aspect-ratio features, for it is beyond most traditional agitation-techniques used today by providing both increased mass transport of reactive species to the cathode as well as mechanically affecting the electrochemical reactions taking place on the cathode.
Conclusions that ultrasound use clearly affected deposit properties and coating mechanisms, such as catalyst specific area, stirring dependence, surface energy evolution, dihydrogen desorption, and structure of coating, were obtained in the document [3].
(a) Air pump agitation (P=0) (b) Ultrasonic agitation (P= 4W/cm 2 ) (c) Ultrasonic agitation (P= 6W/cm 2 ) (d) Ultrasonic agitation (P= 8W/cm 2 ) (e) Ultrasonic agitation (P= 10W/cm 2) (f) Ultrasonic agitation (P= 12W/cm 2) (g) Ultrasonic agitation (P= 14W/cm 2 ) (h) Ultrasonic agitation (P= 16W/cm 2 ) Fig.2 Deposit morphology caused by air pump agitation and high frequency sonication of different level of power intensities The observation of these disparities between surface morphologies is believed to be attributed to the following factors: (1) mass transport rate with the use of ultrasonic agitation is much higher due to the acoustic streaming serving as local mass transport pumps for ions and other species in the electrolyte near the cathode surface, which narrows the extension of diffusion-transport and reduces concentration gradients, and this effect increases with the increasing of power sonication[2,6]
Ultrasonic agitation or vibration of electrode (anodes or cathode) is frequently considered to solve the problem of mass transport limitation during electrodeposition of metals within deep, high-aspect-ratio features, for it is beyond most traditional agitation-techniques used today by providing both increased mass transport of reactive species to the cathode as well as mechanically affecting the electrochemical reactions taking place on the cathode.
Conclusions that ultrasound use clearly affected deposit properties and coating mechanisms, such as catalyst specific area, stirring dependence, surface energy evolution, dihydrogen desorption, and structure of coating, were obtained in the document [3].
(a) Air pump agitation (P=0) (b) Ultrasonic agitation (P= 4W/cm 2 ) (c) Ultrasonic agitation (P= 6W/cm 2 ) (d) Ultrasonic agitation (P= 8W/cm 2 ) (e) Ultrasonic agitation (P= 10W/cm 2) (f) Ultrasonic agitation (P= 12W/cm 2) (g) Ultrasonic agitation (P= 14W/cm 2 ) (h) Ultrasonic agitation (P= 16W/cm 2 ) Fig.2 Deposit morphology caused by air pump agitation and high frequency sonication of different level of power intensities The observation of these disparities between surface morphologies is believed to be attributed to the following factors: (1) mass transport rate with the use of ultrasonic agitation is much higher due to the acoustic streaming serving as local mass transport pumps for ions and other species in the electrolyte near the cathode surface, which narrows the extension of diffusion-transport and reduces concentration gradients, and this effect increases with the increasing of power sonication[2,6]
Online since: January 2016
Authors: Wen Jing Ma, Yong Xiao, Ming Jun Chen
Currently, Paul Geraghty of LLNL and François Guillet of France have developed corresponding devices for different mechanical mitigation technology respectively[3,4].
The spindle fixture and axis Z are connected by bolt joints, so the vibration generated from the high-speed rotation movement of the spindle will affect the stability of the moving axis, and thus indirectly affect the processing quality.
Considering the input properties of drivers and the need of high-precision feed amount, a kind of velocity&acceleration feed forward control strategy with Notch filters based on the traditional PID control algorithm is applied to the system of machine tool.
Depending on the corrector loop type selected, the level of this output voltage can be the result of two gain factors, the PID corrector and the feed forward loop.
Chun-Hong, Modelling vibration transmission in the mechanical and control system of a precision machine[J].
The spindle fixture and axis Z are connected by bolt joints, so the vibration generated from the high-speed rotation movement of the spindle will affect the stability of the moving axis, and thus indirectly affect the processing quality.
Considering the input properties of drivers and the need of high-precision feed amount, a kind of velocity&acceleration feed forward control strategy with Notch filters based on the traditional PID control algorithm is applied to the system of machine tool.
Depending on the corrector loop type selected, the level of this output voltage can be the result of two gain factors, the PID corrector and the feed forward loop.
Chun-Hong, Modelling vibration transmission in the mechanical and control system of a precision machine[J].
Online since: January 2014
Authors: Xing Lin Qi, Zhi Ning Zhao, Bo Jiang
But the characteristic of vibration is repetitive loading, so parts are easy caused fatigue and ageing, especially for mechanical insurance is more serious.
The inertial force and duration of the internal impact when the fuze fall down, depend on factors such as the projectile weight, packing method, height and surface properties and so on.
For the fuze safety and arming system, impact parameters that affect safety and arming system mainly include impact acceleration peak value and duration.
And the main influence factors for fuze MEMS pressure sensor are high temperature and recoil.Projectile recoil has larger spread according to different weapons.
Take circular diaphragm for example to study the fundamental frequency influence factors.
The inertial force and duration of the internal impact when the fuze fall down, depend on factors such as the projectile weight, packing method, height and surface properties and so on.
For the fuze safety and arming system, impact parameters that affect safety and arming system mainly include impact acceleration peak value and duration.
And the main influence factors for fuze MEMS pressure sensor are high temperature and recoil.Projectile recoil has larger spread according to different weapons.
Take circular diaphragm for example to study the fundamental frequency influence factors.
Online since: February 2011
Authors: Hai Ting Xia, Rong Xin Guo, Bang Cheng Yang, Le Hui Huang, Feng Yan
The stress caused by current impulse is an important factor in PRMMC’s failure.
Thus, it is significant and valuable to study on the mechanical properties and micro-damage mechanism of PRMMC in current impulse.
Liu et al used multi-particle model to investigate the thermo-mechanical behaviour of PRMMC[5].
From this Fig., it can be seen that the temperature field is affected by the interference of particles and the highest temperature exists in the matrix between particles.
Temperature and stress are affected by the interference of particles, but the interference distance is shorter.
Thus, it is significant and valuable to study on the mechanical properties and micro-damage mechanism of PRMMC in current impulse.
Liu et al used multi-particle model to investigate the thermo-mechanical behaviour of PRMMC[5].
From this Fig., it can be seen that the temperature field is affected by the interference of particles and the highest temperature exists in the matrix between particles.
Temperature and stress are affected by the interference of particles, but the interference distance is shorter.
Online since: January 2012
Authors: Li Xin, Zhou Jing, Lu Lu
However, there are few reports on the explosion damage properties of a concrete gravity dam that experiences a strong underwater shock wave.
Because the strength is may be more important to affect the damage of the model dam.
But the damage process is affected by many complex factors; thus, it is difficult to clearly judge whether the damage pattern of the model is similar to the prototype, and this issue may continue to present problems.
However, using the hammer impact test, we can compare the properties of various protective measures to determine appropriate protective measures.
References: [1] Shi Shaoqing, Zhang Xiangji, et al: Studies On The Properties of ANTI-Pentration of Rigid Polyurethane Foam.China J of Vibration and Shock, (2005),24(5):PP56-58
Because the strength is may be more important to affect the damage of the model dam.
But the damage process is affected by many complex factors; thus, it is difficult to clearly judge whether the damage pattern of the model is similar to the prototype, and this issue may continue to present problems.
However, using the hammer impact test, we can compare the properties of various protective measures to determine appropriate protective measures.
References: [1] Shi Shaoqing, Zhang Xiangji, et al: Studies On The Properties of ANTI-Pentration of Rigid Polyurethane Foam.China J of Vibration and Shock, (2005),24(5):PP56-58
Online since: October 2018
Authors: Evgeniy V. Pavlov, E.A. Kudryashov, I.M. Smirnov
The analysis of the literary source and the practice of metalworking indicate that composites, due to their fragility, are practically unknown when cutting the combined surfaces with impact, although their potentialities, due to their unique physical and mechanical characteristics and cutting properties, could be used [6-12].
Comparison of physical and mechanical characteristics of composites.
Dynamic and vibrational loads affect the condition of the treated surface.
The cycloidal shape of the profile helps to reduce the force of friction of the chips on the front surface, which ensures the preservation of the tool material for a long period of time under the rational conditions of cutting-in of the cutting element into the workpiece, since friction is one of the important factors affecting the cutting forces, the temperature of the tool contact surfaces and the state of the part surface layer.
Osadchii, Improving performance of cBN cutting tools by increasing their damping properties.
Comparison of physical and mechanical characteristics of composites.
Dynamic and vibrational loads affect the condition of the treated surface.
The cycloidal shape of the profile helps to reduce the force of friction of the chips on the front surface, which ensures the preservation of the tool material for a long period of time under the rational conditions of cutting-in of the cutting element into the workpiece, since friction is one of the important factors affecting the cutting forces, the temperature of the tool contact surfaces and the state of the part surface layer.
Osadchii, Improving performance of cBN cutting tools by increasing their damping properties.
Online since: May 2006
Authors: Alberto C. Ferro, José Maria F. Ferreira, Mafalda Guedes
Obtaining ceramic bodies with enhanced mechanical properties via colloidal processing
requires efficient dispersion of the ceramic powders.
Nevertheless, little work has been developed regarding its dispersion properties in solvents [11].
Properties of the organic additives, according to the manufacturers.
After powder addition, mechanical stirring continued for 10 minutes.
The effectiveness of the dispersants apparently results from several factors: the slightly basic IEP of bare CuO particles, the nature of the dispersants used, as well as the size of the molecules and their specific interactions with the particles' surface.
Nevertheless, little work has been developed regarding its dispersion properties in solvents [11].
Properties of the organic additives, according to the manufacturers.
After powder addition, mechanical stirring continued for 10 minutes.
The effectiveness of the dispersants apparently results from several factors: the slightly basic IEP of bare CuO particles, the nature of the dispersants used, as well as the size of the molecules and their specific interactions with the particles' surface.
Online since: September 2022
Authors: Amnart Suksri, Kanin Wajanasoonthon
Significant thermal properties of nanofluids have been improving depends upon fluid-based properties, nanoparticle's thermal conductivity, and the concentration of nanoparticles.
However, the electrical properties of insulation material will change gradually during operation.
Rajab et al. studied the aging properties of PFAE, M182, FR3, and mineral oil.
Analysis of Factors Affecting Temperature Rise of Oil-immersed Power Transformer.
Properties of thermally aged natural esters used as insulating liquid.
However, the electrical properties of insulation material will change gradually during operation.
Rajab et al. studied the aging properties of PFAE, M182, FR3, and mineral oil.
Analysis of Factors Affecting Temperature Rise of Oil-immersed Power Transformer.
Properties of thermally aged natural esters used as insulating liquid.
Online since: September 2013
Authors: Gorun Arun, Ali Osman Kuruscu
Figure 5 Wells beside the foundation walls
Listed buildings
As the pace of urbanization was increasing after 1960’s Istanbul had experienced unplanned development affecting the natural and cultural values of the historical areas.
Design supervision and construction supervision of restoration activities of public property are undertaken by the General Directorate of Foundations (foundation properties) and Ministry of Culture and Tourism (other public properties) where the design and construction supervision of restoration activities on private property are undertaken by the municipality in line with the principles approved by the regional conservation council concerned.
The timber houses inspected in Istanbul are privately owned properties.
Wood’s moisture content affects the dimensional stability, bending strength, stiffness and load duration providing more problems than any other factor in its use.
The people using these properties have to be educated so that they are aware and proud with their own heritage.
Design supervision and construction supervision of restoration activities of public property are undertaken by the General Directorate of Foundations (foundation properties) and Ministry of Culture and Tourism (other public properties) where the design and construction supervision of restoration activities on private property are undertaken by the municipality in line with the principles approved by the regional conservation council concerned.
The timber houses inspected in Istanbul are privately owned properties.
Wood’s moisture content affects the dimensional stability, bending strength, stiffness and load duration providing more problems than any other factor in its use.
The people using these properties have to be educated so that they are aware and proud with their own heritage.