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Online since: October 2013
Authors: Wan Jun Hou, Feng Ming Sun, Sheng Yan Zhang, Hui Xi
Dry hanging type of external thermal insulation system is that the rock wool board, glass cotton board thermal insulation material by mechanical fixed to the base wall, which belongs to the dry construction, convenient construction, construction adaptability.
The disadvantages mainly displays in: the need to spot the two programming, human factors; due to the lack of control algorithm model of advanced, energy efficiency is not ideal; high maintenance cost; energy saving effect is difficult to evaluate
Replacement of energy-saving lighting apparatus Practice has proved, in the premise of not affecting the lighting effect, the replacement of energy-saving lamp light source and lighting energy saving measures are the most effective.
Renewable energy Status of energy saving renovation of office buildings, the majority of energy transformation mainly focused on building thermal insulation properties, to eliminate all potential causes gap heat loss, and the winter heating household metering etc..
The disadvantages mainly displays in: the need to spot the two programming, human factors; due to the lack of control algorithm model of advanced, energy efficiency is not ideal; high maintenance cost; energy saving effect is difficult to evaluate
Replacement of energy-saving lighting apparatus Practice has proved, in the premise of not affecting the lighting effect, the replacement of energy-saving lamp light source and lighting energy saving measures are the most effective.
Renewable energy Status of energy saving renovation of office buildings, the majority of energy transformation mainly focused on building thermal insulation properties, to eliminate all potential causes gap heat loss, and the winter heating household metering etc..
Online since: April 2012
Authors: Mohd Yusof Noordin, Mohd Rosmaini Shaari, Ali Davoudinejad
Noordin1,a, Ali Davoudinejad2,b, Mohd Rosmaini Shaari3,c
Department of Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Malaysia
anoordin@fkm.utm.my, bali_davoudinejad@yahoo.com, cmshaari@hotmail.com
Keywords: Hard machining, honed, honed with finishing wiper, T-land, surface roughness, cutting forces.
Clear attraction to hard turning is due of numerous advantages over grinding process such as reduced processing cost, elimination of coolant, improved material properties, reduced power consumption and higher productivity.
Investigation into the influence of cutting parameters when finish hard turning MDN250 steel with coated ceramic inserts found that the effect of cutting speed on cutting forces was insignificant, whereas feed rate and depth of cut are the most influential factors affecting cutting forces [8].
Clear attraction to hard turning is due of numerous advantages over grinding process such as reduced processing cost, elimination of coolant, improved material properties, reduced power consumption and higher productivity.
Investigation into the influence of cutting parameters when finish hard turning MDN250 steel with coated ceramic inserts found that the effect of cutting speed on cutting forces was insignificant, whereas feed rate and depth of cut are the most influential factors affecting cutting forces [8].
Online since: May 2007
Authors: Tae Won Kim, Chang Sik Ju, Si Young Kim
Supercritical Impregnation of Organic Phase Change Materials into
Polyester Fiber
Chang Sik Ju1,a, Tae Won Kim
1,b and Si Young Kim
2,c
1
School of Applied Chemical Engineering, Pukyong National University,
2
School of Mechanical Engineering, Pukyong National University,
100 Yongdang-Dong, Nam-Gu, Busan, 608-739, Korea
acsju@pknu.ac.kr, bhostile3@hanmail.net, cksy2107@empas.com
Keywords: phase change materials, polyester fiber, impregnation, supercritical, carbon dioxide.
Supercritical fluids, especially supercritical carbon dioxide(ScCO2), have high solvent strength for many non-volatile organic materials including PCMs and excellent mass-transport properties which contribute to extraction and impregnation applications.
The impregnation temperature is one of the important factors affecting on the supercritical impregnation of solutes into polymers.
Supercritical fluids, especially supercritical carbon dioxide(ScCO2), have high solvent strength for many non-volatile organic materials including PCMs and excellent mass-transport properties which contribute to extraction and impregnation applications.
The impregnation temperature is one of the important factors affecting on the supercritical impregnation of solutes into polymers.
Online since: July 2011
Authors: Eva Kalabisová, Jan Racek, K Vaclavikova
Experimental
Experimental equipment with heat transfer and continuously damp and vaporization was made for chemical and mechanical testing IIR lining.
Atomic ratios were calculated from the XPS spectra after correcting the relative peak areas by sensitivity factors based on the transmission characteristics of the MCD system.
H2SO4 70 5 continuously damp / evaporation *Chemical properties of deposit: pH 0.4, conductivity 116.4 mS.cm-1 SO42- H2SO4 Cl- F- NO3- PO43- Ca Fe Wt.% 45.3 33.3 0.12 0.01 0.07 0.2 0.05 4.8 Results and Discussion After exposure to standard temperature and pressure (STP) (also in body literature mentioned as NP- natural passivation) and to various chemicals environment, butyl rubber was subjected to modest oxidation, producing a variety products.
The differences were apparent in the cases the most degraded or affected samples IIR D3 sample (shown in Figure 2).
Red labeled number correspond to the most degraded and affected surface.
Atomic ratios were calculated from the XPS spectra after correcting the relative peak areas by sensitivity factors based on the transmission characteristics of the MCD system.
H2SO4 70 5 continuously damp / evaporation *Chemical properties of deposit: pH 0.4, conductivity 116.4 mS.cm-1 SO42- H2SO4 Cl- F- NO3- PO43- Ca Fe Wt.% 45.3 33.3 0.12 0.01 0.07 0.2 0.05 4.8 Results and Discussion After exposure to standard temperature and pressure (STP) (also in body literature mentioned as NP- natural passivation) and to various chemicals environment, butyl rubber was subjected to modest oxidation, producing a variety products.
The differences were apparent in the cases the most degraded or affected samples IIR D3 sample (shown in Figure 2).
Red labeled number correspond to the most degraded and affected surface.
Online since: June 2014
Authors: Xiang Fa Liu
Serious deviation will result in pile pile aside , the need to re- fill piles treatment measures, on the one hand affected the progress of construction, on the other hand , changing the original force calculation , the quality of the building planted a hidden danger .
It differs from the general adjustment task is this: did not eliminate the error , but it is a crowded place in the section does not affect the quality of the project , and its " absorption" Bale. 2.4 retest work Measuring retest ( check measurements ) is essential to ensure a quality of construction work .
If the deformation observation data with impact factor multiple regression analysis and stepwise regression calculation , obtained as a function of deformation and significant factor between , except for physical interpretation , but also can be used for deformation prediction.
Deformable model based on both the physical and mechanical properties and geological information deformable body selected curve can also be selected according to the displacement vector and the deformation process point field .
It differs from the general adjustment task is this: did not eliminate the error , but it is a crowded place in the section does not affect the quality of the project , and its " absorption" Bale. 2.4 retest work Measuring retest ( check measurements ) is essential to ensure a quality of construction work .
If the deformation observation data with impact factor multiple regression analysis and stepwise regression calculation , obtained as a function of deformation and significant factor between , except for physical interpretation , but also can be used for deformation prediction.
Deformable model based on both the physical and mechanical properties and geological information deformable body selected curve can also be selected according to the displacement vector and the deformation process point field .
Online since: January 2014
Authors: Ning An, Liu Hai
Finite Element Analysis of Rolling Process for Pilger Mill
Ning An1, a, Hai Liu1
1School of Mechanical Engin., Hubei University of Technology, Wuhan Hubei 430068, China
aanning924@126.com
Keywords: DEFORM-3D; FEA; Pilger Mill; Cold Pilger Rolling
Abstract.
Its process is mainly to reduce pipe diameter and wall thickness, no metal loss during the rolling process, metal utilization ratio is high, and the geometry size and mechanical properties on the quality of the finished product has improved.
It is can be seen from Fig 3-b the pipe was turned an angle(47º), the ears produced by the last process rolling close to the rolls, while the radius of the roll pass in each process is changed a little, the ears may affect smoothness of the pipe surface.
Since mutation of the roll shape forming stress concentration, the factor causes greater stress at the junctions.
Its process is mainly to reduce pipe diameter and wall thickness, no metal loss during the rolling process, metal utilization ratio is high, and the geometry size and mechanical properties on the quality of the finished product has improved.
It is can be seen from Fig 3-b the pipe was turned an angle(47º), the ears produced by the last process rolling close to the rolls, while the radius of the roll pass in each process is changed a little, the ears may affect smoothness of the pipe surface.
Since mutation of the roll shape forming stress concentration, the factor causes greater stress at the junctions.
Online since: November 2025
Authors: Yevhenii Titkov, Petro Stukhliak, Olga Kushnarova, Oleg Totosko, Olena M. Berdnikova, O.V. Kolisnichenko
The properties of coating materials during their formation are also affected by the volume fraction of pores.
Korzhik, The effect of mechanical pretreatment of polyethylene terephthalate powder on the structural and mechanical properties of coatings made from it, Mech.
Kunitskii, Structure and properties of gas-thermal coatings of Fe–B–C and Fe–Ti–B–C alloys, Powd.
Titkov, Effect of nano-structured factors on the properties of the coatings produced by detonation spraying method, in: A.D.
Alekseienko, Structure and properties of laser-welded joints from high-strength steels, Appl.
Korzhik, The effect of mechanical pretreatment of polyethylene terephthalate powder on the structural and mechanical properties of coatings made from it, Mech.
Kunitskii, Structure and properties of gas-thermal coatings of Fe–B–C and Fe–Ti–B–C alloys, Powd.
Titkov, Effect of nano-structured factors on the properties of the coatings produced by detonation spraying method, in: A.D.
Alekseienko, Structure and properties of laser-welded joints from high-strength steels, Appl.
Online since: October 2015
Authors: Hadj Miloua
Its value depends on the bulk property of ρbv and the fuel element property of ρe
§ Fuel element properties: The numerical model requires the following properties of the fuel elements.
We present some numerical results obtained during the propagation of a crown fire (affecting all the solid fuel located between the ground and the tree top) in a virtual forest.
Also, there intrinsic factors belonged to the vegetative fuels it is burning differently in grass, litter, into shrubs crowns belonged to thickness and position to the fire and Fuel Moisture: fuels dry favorite for spreading than green vegetation.
Rothermel, Thermal Uses and Properties of Cabohydrates and Lignins, Chapter Forest Fires and the Chemistry of Forest Fuel, Academic Press, San Francisco, 1976. pp. 245–259; [23] R.A.
Susott, Characterization of the thermal properties of forest fuels by combustible gas analysis, Forest Sci. 2 (1982) 404–420; [24] W.J.
We present some numerical results obtained during the propagation of a crown fire (affecting all the solid fuel located between the ground and the tree top) in a virtual forest.
Also, there intrinsic factors belonged to the vegetative fuels it is burning differently in grass, litter, into shrubs crowns belonged to thickness and position to the fire and Fuel Moisture: fuels dry favorite for spreading than green vegetation.
Rothermel, Thermal Uses and Properties of Cabohydrates and Lignins, Chapter Forest Fires and the Chemistry of Forest Fuel, Academic Press, San Francisco, 1976. pp. 245–259; [23] R.A.
Susott, Characterization of the thermal properties of forest fuels by combustible gas analysis, Forest Sci. 2 (1982) 404–420; [24] W.J.
Online since: September 2018
Authors: Oluwole Daniel Makinde
The physical properties of H2O and Fe3O4nanoparticles are listed in tables 1 and 2 below;
Table 1: Nanoparticles and base fluid thermophysical properties [6, 7]
Physical Properties
r(kg/m3)
Cp(J/kg.K)
k(W/m.K)
s(S/m)
H2O
997.1
4179
0.613
5x10-5
Fe3O4
5180
670
9.7
2.5x106
Table 2: The nanoparticles shape factors (m) [21]
Nanoparticles Shape
Shape
Structure
Shape Factor
(m)
Spherical
3
Bricks
3.7
Cylindrical
4.9
Platelets
5.7
Blades
8.6
To convert the governing equations (1)-(4)into a set of similarity equations, we introduce the following transformation, parameters and variables
(6)
and obtain
, (7)
, (8)
with
(9)
where Pr is the base fluid Prandtl number (Pr» 6.07), Bi is the Biot number, Ec is the Eckert number, Ha is the magnetic field parameter, S>0 corresponds fluid suction and S<0 is the injection parameter, l>0 represents the sheet stretching while l<0 represents the sheet shrinking parameter.
Similar trend of elevated Nusselt number is observed with a rise in suction, convective heating and nanoparticles shape factor parameter.
Finally, several technological equipment such as electronic apparatus andminiature microscale devicesdo experience enormous heat which may adversely affect their operation.
Khan, Stagnation point flow of MHD chemically reacting nanofluid over a stretching convective surface with slip and radiative heat, Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering. 231(4) (2017) 695–703
Makinde, Magnetohydrodynamic stagnation point flow of a power-law nanofluid towards a convectively heated stretching sheet with slip, Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 230(5) (2016) 345-354
Similar trend of elevated Nusselt number is observed with a rise in suction, convective heating and nanoparticles shape factor parameter.
Finally, several technological equipment such as electronic apparatus andminiature microscale devicesdo experience enormous heat which may adversely affect their operation.
Khan, Stagnation point flow of MHD chemically reacting nanofluid over a stretching convective surface with slip and radiative heat, Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering. 231(4) (2017) 695–703
Makinde, Magnetohydrodynamic stagnation point flow of a power-law nanofluid towards a convectively heated stretching sheet with slip, Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 230(5) (2016) 345-354
Online since: October 2014
Authors: Patarapol Tantipidok, Dinara McLaughin, Petr Štemberk
Mechanical interlocking between wire and concrete depends on the geometry and depth of indentations of the wire.
Moreover, in practice the value of stress in the wire just after release σpm0 would also have a lower magnitude since the prestressing is designed such a way that the material properties of steel would not be utilised at their full capacity (maximum prestressing force).
This is affected by various factors, i.e., type of cementitious materials, type and amount of admixtures, water-to-cement ratio and ambient temperature during casting and curing period.
Combining STM method and the development of concrete properties by MC2010 [3], the relationships between transmission length of the PC sleeper, maximum prestressing force and time can be established.
The capacities of STM members developed with time can be calculated as follows: (7) (8) where c1 are 0.6 for compressive struts, 0.85 for node 3 γc is the safety factor (=1.3) By checking the STM member’s capacities, the development of maximum allowable prestressing force (Pmax) with time according to transmission length (l) can be demonstrated in Fig. 8.
Moreover, in practice the value of stress in the wire just after release σpm0 would also have a lower magnitude since the prestressing is designed such a way that the material properties of steel would not be utilised at their full capacity (maximum prestressing force).
This is affected by various factors, i.e., type of cementitious materials, type and amount of admixtures, water-to-cement ratio and ambient temperature during casting and curing period.
Combining STM method and the development of concrete properties by MC2010 [3], the relationships between transmission length of the PC sleeper, maximum prestressing force and time can be established.
The capacities of STM members developed with time can be calculated as follows: (7) (8) where c1 are 0.6 for compressive struts, 0.85 for node 3 γc is the safety factor (=1.3) By checking the STM member’s capacities, the development of maximum allowable prestressing force (Pmax) with time according to transmission length (l) can be demonstrated in Fig. 8.