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Online since: June 2009
Authors: Taghi Tawakoli, Abdolreza Rasifard, Alireza Vesali
The performance of super abrasives grinding tools is being affected by a variety of individual factors like the dressing process as well as the coolant lubricant used [1,2,3].
The use of polymers in coolant lubricants provides for the adjustment of the viscosity and consequently of the lubrication properties.
Auflage, Springer-Verlag, 2005 [2] Tawakoli, T.: High Efficiency Deep Grinding, Technology, process, planning and application, Mechanical Engineering Publication, London, 1993 [3] Werner, G., Tawakoli, T.: Fortschritte beim HEDG-Verfahren mit CBN-Schleifscheiben, Industrial Diamond Review, IDR 1 (1990) [4] Schulz, A.: Das Abrichten von keramisch gebundenen CBN-Schleifscheiben mit Formrollen, Dr.
Online since: September 2013
Authors: Yoshimi Watanabe, Hisashi Sato, H. Tsukamoto, Yoshiki Komiya, N. Oshima
It is well accepted that finer grain size improves mechanical properties, hot crack susceptibility, pressure tightness, fluidity and feeding to eliminate shrinkage porosity, distribution of second phases and microporosity, machinability and cosmetic features.
It is considered that the extent of refinement of microstructure including dendrite structure largely affect hardness of cast aluminum.
In this study it was also found that SUS434L (bcc) powder shows capability of refinement of microstructure characterized by dendrite structure in cast aluminum, which means that there is some room to consider factors other than crystal structures for stainless steel powders to be refiners for enhancement of microstructure refinement of cast aluminum.
Online since: June 2013
Authors: Yu Zhong Yang, Li Mei Li, Ji Ye Peng, Hai Li
In some projects of the air-cooling system of power plant, the reinforcing measures for condensate pipe were used, the effect is unsatisfactory, and condensate pipe vibration seriously affects the safe operation of the unit.
This flow pattern discrimination is carried out according to the discriminant parameter of Fr with superficial flow flux and the discriminant parameters of Y with fluid properties.
Conclusions In the condensate pipe system design, we should consider various factors that cause the condensate water pipe vibration.
J.Multiphase Flow, 1974, 1: 537—553 [5] Liu Ding zhi, Research and application of Multiphase Transportation Technology, Southwest Petroleum Institute master's thesis,2003, In Chinese [6] Gu Bilun, Anti-vibration methods and measures for vapor-liquid two-phase flow piping, Petrochemical equipment technology, 2011,32 (2) , China Building Industry Press [7] Cai Zengji etc., Fluid mechanical pump and fan, China Building Industry Press, China Building Industry Press [8] CAESAR II software, Beijing AECsoft engineering software Co.
Online since: August 2013
Authors: Shu Jun Bai, Shao Ying Xiao
Meanwhile, affected by a lot of time factors,the planning,design and construction of small towns tend to be consistent and the characteristic is more and more fuzzy,so it is necessary to discuss the protection and development of the vernacular landscape during the fast urbanization process to provide ideas for the healthy development of small towns.
The components of the vernacular landscape of small towns are complex and diverse.We divide the components into two major categories including natural environment elements and humanities landscape elements.Natural environment elements are the basis material carrier created by vernacular landscape,and a kind of objective existence and natural landscape form;According to material properties and characteristics,humanities landscape elements can be divided into material cultural landscape elements and non-material cultural landscape,the fist are material substance of cultural landscape,the latter mainly refers to the local special customs and morals of the people,adhere to the natural environment elements and above cultural landscape elements.
Secondly,the designers are used to imitate others.The convenient information sharing platform, following popular design ideas and lacking of innovation consciousness,make a lot of same and featureless designs.Tirdly,local government leaders tend to dominate the designer's subjective consciousness,then generates a lot of mechanical designs without soul.Forthly, global integration has brought syncretic communication among countries .Western dominant cultures are infiltrating Chinese various aspects of traditional lifestyles,values,behavior habits, aesthetic taste and so on[3],and a lot of places are lack of self-protection consciousness,lost in the tide of cultural convergence,and lose its own characteristics.
Online since: November 2019
Authors: Abdulmajid Addali, Naser Ali, Joao Amaral Teixeira
In addition, the performance of the plate HE has been known to depend on a number of factors, including, plate structural design, surface characteristics, liquid properties, etc.
Water properties measurements and theoretical calculation.
Addali, A Review on Nanofluids: Fabrication, Stability, and Thermophysical Properties, J.
Lee, Contact angle and wetting properties, Springer Series in Surface Sciences, 51 (2013) 34
Wortman, Relationships between residual stress, microstructure and mechanical properties of electron beam–physical vapor deposition thermal barrier coatings, Surface and Coatings Technology, 108-109 (1998) 80-85
Online since: June 2009
Authors: Tao Chen, Xiao Li Xu, Shao Hong Wang
Wavelet packet in vibration signal analysis for mechanical equipment is applied widely.
With energy normalization for characteristic factors of equation (5), characteristic vectors are obtained as follows [3]
Flue gas turbine units are complex multi-layer mechanical systems.
From the property of common wavelet functions mentioned above and requirements for wavelet function selection this paper uses basic wavelet function Daubechies wavelet.
Because signal energy in the frequency band is affected when the system has fault, characteristic vector is constructed using the energy after normalization processing as element [5,6].
Online since: April 2012
Authors: Long Sheng Lu, Chuan Chen, Qiu Gang Fu
Constrained by tight and confined spaces, and affected by the heat of LED chips, the internal temperature of LED drivers rises quickly.
RS-A is the thermal resistance between the fins and the environment, which is influenced by many factors such as fin structure, area and environment wind speed.
The cabinet/block/source commands in the model base of ICEPAK can set parameters such as profiles for solving domain/thermal elements/source, location dimension, thermal physical property, etc.
From the diagrams we can see that the temperatures of the capacitor and the MOSFET are over 65℃ in the original system, which will affect the lifespan of the two components.
Conclusions can be drawn as follows: 1) Heat pipes being applied LED drivers can satisfy the properties of heat pipes, which have tight and confined spaces, high heat flux, high protection grades, etc.
Online since: August 2013
Authors: Wan Li Pu, Qing Zhang
It seriously affect the safety of personal, property .
When cracks produced, the mechanical properties of the wall decreased obviously, forming hidden trouble in the engineering. 3 The Causes Of Cracks And Settlement 3.1 Foundation Settlement.
According to the Dangerous Building Appraisal Standard (JGJ125-99), when the tilt rate of the building is more than 1% [1], it will affect the safety of the buildings.
To the existing buildings, because of various factors, such as changes of underground water level; base collapsibility do not make processing; uneven soil do not make processing; foundation has poor stiffness; and upper integrity of building is not good .etc, the base happens with uneven settlement, then the upper walls dehisce.
Online since: July 2014
Authors: Hu Yin, Neng Luo, Qian Li
Hakimi has done specific mechanical researches of the vibration of the drill string [4].
The drill string can be considered as a one-dimensional elastic medium with piece-wise constant properties.
(5) Where, ω is the axial vibration natural frequency of the drill string, its value depends on the property of material and assembly of drill string.
The quantities of drill collars and heavy weight drill pipes will affect the effect of jarring operation greatly.
A Study of How Heavy weight Drill Pipe Affects Jarring Operation, Society of Petroleum Engineers, 60th Annual Technical Conference&Exhibition, September 22-25 (1985)
Online since: February 2019
Authors: Rushan G. Safin, Dmitry B. Prosvirnikov, Nail F. Timerbaev
This property of lignocellulosic material activated by steam explosion treatment is the basis of the process of obtaining MCC, which is being studied in this work and explains the effectiveness of the developed method.
The change in the content of cellulose polysaccharide is described by equations (15) - (18) (15) (16) where k1 – is the constant rate of cellulose hydrolysis, - initial concentration of cellulose, - concentration of cellulose in the moment of hydroloysis time , - relative catalytic activity of the catalyst (acid), N - the normality of the catalyst, expressed by the number of its gram equivalents in 1 liter of solution, - relative stability factor of polysaccharide to hydrolysis, relative stability coefficient of polysaccharide to hydrolysis, characterizing the strength of glycosidic bonds in polysaccharides, – the relative coefficient characterizing the effect of the process temperature on the rate constant of the hydrolysis of the polysaccharide.
Acknowledgment The presented results were obtained within the framework of the state task "Initiative scientific projects" on the theme No. 13.5443.2017 / BC "Modification of the physical and chemical properties of wood biomass affecting the performance characteristics of the materials being created".
Proceedings of 2015 International Conference on Mechanical Engineering, Automation and Control Systems, MEACS 2015. (2015) 7414929.
[29] Timerbaev N.F., Sadrtdinov A.R. and Safin R.G., Software systems application for shafts strength analysis in mechanical engineering.
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