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Online since: March 2011
Authors: Norhamidi Muhamad, Abu Bakar Sulong, Heng Shye Yunn
In the case of powder, small particle sizes are necessary as they: (a) contribute to smaller structural details, higher aspect ratio and better shape retention of microstructures (b) give fairly isotropic behavior (c) yield better surface finish and quality (d) design accuracy (e) possible to fabricate of more precise parts (f) enhance mechanical properties of the microstructure [3,8,15,16,17,18,19,20,21].
Effects and Results of Parameters in µPIM In µPIM, three parameters minimize mold filling defects namely material properties, processing parameters and part geometry [4].
Furthermore, inner wall of the mold that was the key factor influencing the fillings step in μPIM [25].
It will affect to the polymer mold receive pressure load at injection temperature for long time and makes deformation of the mold.
The quality of the mold insert was found a key factor to influence the final quality of the parts.
Effects and Results of Parameters in µPIM In µPIM, three parameters minimize mold filling defects namely material properties, processing parameters and part geometry [4].
Furthermore, inner wall of the mold that was the key factor influencing the fillings step in μPIM [25].
It will affect to the polymer mold receive pressure load at injection temperature for long time and makes deformation of the mold.
The quality of the mold insert was found a key factor to influence the final quality of the parts.
Online since: July 2014
Authors: T. Karthikeya Sharma, Raj Kumar Gupta, K.A. Sankeerth, G. Amba Prasad Rao, K. Madhu Murthy
Madhu Murthy5,e
1 M.Tech. student, Dept. of Mechanical Engineering, NIT Warangal, India
2 B.Tech student, Dept. of Mechanical Engineering, KITS Warangal, India
3 Research Scholar, Dept. of Mechanical Engineering, NIT Warangal, India
4,5 Professor, Dept. of Mechanical Engineering, NIT Warangal, India
a er.rajg@gmail.com, b sunny.aravind@gmail.com, c karthikeya.sharma3@gmail.com,
d ambaprasadrao@gmail.com, e madhumurthyk@gmail.com
Keywords: Diesel engine, Water-Diesel emulsion, NOx emission, PM emission, micro explosion;
Abstract.
Introduction: Various undesirable emissions are exhausted by internal combustion (IC) engines which affect the environment and cause various problems such as ozone depletion, acid precipitation, global warming and respiratory hazards etc.
The delivery capacity of the injection system is the limiting factor for using water-diesel emulsions.
The delivery capacity of the injection system is the limiting factor for using high content of water in water-diesel emulsions as a fuel in the diesel engine.
[9] Cherng-Yuan Lin, Kuo-Hua Wang: The fuel properties of three-phase emulsions as an alternative fuel for diesel engines, Fuel, Vol.82(2003), p.1367–1375
Introduction: Various undesirable emissions are exhausted by internal combustion (IC) engines which affect the environment and cause various problems such as ozone depletion, acid precipitation, global warming and respiratory hazards etc.
The delivery capacity of the injection system is the limiting factor for using water-diesel emulsions.
The delivery capacity of the injection system is the limiting factor for using high content of water in water-diesel emulsions as a fuel in the diesel engine.
[9] Cherng-Yuan Lin, Kuo-Hua Wang: The fuel properties of three-phase emulsions as an alternative fuel for diesel engines, Fuel, Vol.82(2003), p.1367–1375
Online since: November 2010
Authors: S.J. Ojolo, A.O. Adelaja
Ojolob
Department of Mechanical Engineering, University of Lagos, Akoka, Lagos, Nigeria
aao_adelaja@yahoo.com, bojolosunday@yahoo.com
[Date received: 28 March 2010.
The properties of air are evaluated at 319K, being the average of the maximum of the inlet and outlet temperatures of the system during no load test.
The glass also was cleaned of settled dusts that may affect the collector’s efficiency.
However, higher heat removal factor, useful energy rate, collector efficiency and flow rates are expected (equations 5-9) if a glass with higher transmittance and a collector plate with higher diffusivity are used.
Nusselt number, Nu [22] (2) The following air properties at 319K were used (extracted from Holman, [23]); , , , , , , .
The properties of air are evaluated at 319K, being the average of the maximum of the inlet and outlet temperatures of the system during no load test.
The glass also was cleaned of settled dusts that may affect the collector’s efficiency.
However, higher heat removal factor, useful energy rate, collector efficiency and flow rates are expected (equations 5-9) if a glass with higher transmittance and a collector plate with higher diffusivity are used.
Nusselt number, Nu [22] (2) The following air properties at 319K were used (extracted from Holman, [23]); , , , , , , .
Online since: January 2014
Authors: Di Ming Lou, Ze Chao Kan, Xiao Tian Zhang, Yan Qing Yang, Wen Zhi Lv, Guo Li Chang
Despite that the international criteira of plateu region is 1000 meters above sea level, in China, studies and researches related to plateu adaptivity focuses on the standard of 2000 meters above sea level [1] accoriding to China’s unique geographic factors.
Table 2 Properties of the test for diesel and biodiesel fuels Items Unit EURO IV Value measured value Cetane number ≥ 45 48 50% distillate temperature ℃ ≤ 300 270 90% distillate temperature ≤ 355 339 95% distillate temperature 365 355 10% Evaporation residue disability mass fraction % 3.0-8.0 4.98 Sulfur content mass fraction % 0.01 Viscosity(20℃) 0.0033 Flash Point(close) ℃ ≥ 55 71 acidity mgKOH/100ml ≤ 7 1.8 freezing point ℃ ≤ -50 -53 cold filter plugging point ℃ ≤ -44 -46 chroma ≤ 3.5 2.5 Density(20℃) kg/m3 0.810-0.85 2.3.
Effect of Inlet Heating on Cold starting in High Altitude Environment By increasing the inlet temperature, heating grille improves fuel evaporation and combustion in engine cylinder and further affects the engine starting performance.
Proceedings of the Institution of Mechanical Engineers, Part D:Journal of Automobile Engineering, 2002, 216(6):473-477
Table 2 Properties of the test for diesel and biodiesel fuels Items Unit EURO IV Value measured value Cetane number ≥ 45 48 50% distillate temperature ℃ ≤ 300 270 90% distillate temperature ≤ 355 339 95% distillate temperature 365 355 10% Evaporation residue disability mass fraction % 3.0-8.0 4.98 Sulfur content mass fraction % 0.01 Viscosity(20℃) 0.0033 Flash Point(close) ℃ ≥ 55 71 acidity mgKOH/100ml ≤ 7 1.8 freezing point ℃ ≤ -50 -53 cold filter plugging point ℃ ≤ -44 -46 chroma ≤ 3.5 2.5 Density(20℃) kg/m3 0.810-0.85 2.3.
Effect of Inlet Heating on Cold starting in High Altitude Environment By increasing the inlet temperature, heating grille improves fuel evaporation and combustion in engine cylinder and further affects the engine starting performance.
Proceedings of the Institution of Mechanical Engineers, Part D:Journal of Automobile Engineering, 2002, 216(6):473-477
Online since: July 2020
Authors: T. Paul Chow, Andrew A. Woodworth, Collin W. Hitchcock, Wei Ji, Joseph A. McPherson
Paul Chow2, Wei Ji1,b,
Andrew Woodworth3
1Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York, 12180, U.S.A.
2Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York, 12180, U.S.A.
3NASA Glenn Research Center, Cleveland, Ohio, 44135, U.S.A.
Understanding how the lattice temperature is affected also allows for the explanation behind the behavior seen in Fig. 2, where there are two peaks for the lattice temperature.
Nitta et al., Cosmic Ray Failure Mechanism and Critical Factors for 3.3kV Hybrid SiC Modules, in PCIM Europe 2016; International Exhibition and Conference Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, Nuremberg, Germany, 566
Buyco, Specific Heat Nonmetallic Solids, in Thermophysical Properties of Matter, 5, 448 (1970).
Understanding how the lattice temperature is affected also allows for the explanation behind the behavior seen in Fig. 2, where there are two peaks for the lattice temperature.
Nitta et al., Cosmic Ray Failure Mechanism and Critical Factors for 3.3kV Hybrid SiC Modules, in PCIM Europe 2016; International Exhibition and Conference Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, Nuremberg, Germany, 566
Buyco, Specific Heat Nonmetallic Solids, in Thermophysical Properties of Matter, 5, 448 (1970).
Online since: September 2014
Authors: J. Meinhardt, Marion Merklein, Ingo Heinle, A. Lipp, Andreas Sabathil
Chemical composition and mechanical properties of the investigated material are given in Table 1.
Table 1: Properties of investigated aluminum alloy AlSi0.6Mg0.5.
Chemical composition [wt%] Si Fe Cu Mn Mg Cr Zn Ti 0.6 0.16 0.13 0.1 0.7 0.01 0.01 0.03 Mechanical properties (Mean value / Deviation) YS [MPa] TS [MPa] Lankford Coefficients R0 R45 R90 116.3 / 0.5 222.4 / 1.2 0.70 / 0.02 0.49 / 0.01 0.64 / 0.01 Evaluation methods The evaluation is carried out using two different methods.
higher factor 10) than slope of the steady fit, the stage where lines cross is used.
Slopes given in Figure differ by factor approx. 80, so stage closest to where the lines cross is used.
Table 1: Properties of investigated aluminum alloy AlSi0.6Mg0.5.
Chemical composition [wt%] Si Fe Cu Mn Mg Cr Zn Ti 0.6 0.16 0.13 0.1 0.7 0.01 0.01 0.03 Mechanical properties (Mean value / Deviation) YS [MPa] TS [MPa] Lankford Coefficients R0 R45 R90 116.3 / 0.5 222.4 / 1.2 0.70 / 0.02 0.49 / 0.01 0.64 / 0.01 Evaluation methods The evaluation is carried out using two different methods.
higher factor 10) than slope of the steady fit, the stage where lines cross is used.
Slopes given in Figure differ by factor approx. 80, so stage closest to where the lines cross is used.
Online since: August 2021
Authors: Yulia Indriani, Afifah Sri Agustiah Putr Sutanti, Megadita Ayuningtyas, Hendri Widiyandari
By optimizing the material properties to have a large amount of active material on the surface.
The mechanism of photocatalyst activity on TiO2 will lead to self-cleaning and antibacterial properties under exposure to UV radiation.
After the drying process, heating is carried out to improve the mechanical properties of the film and for complete polycondensation.
However, several other things need to be done to identify the structural properties of the TiO2 film so that it can provide a broader explanation of the surface morphology, pore structure, and other properties.
The main factor in the degradation process using photocatalysts is the light intensity which affects the number of photons and the amount of catalyst used to transmit light properly so that sufficient electron-hole pairs will be formed in the photodegradation process.
The mechanism of photocatalyst activity on TiO2 will lead to self-cleaning and antibacterial properties under exposure to UV radiation.
After the drying process, heating is carried out to improve the mechanical properties of the film and for complete polycondensation.
However, several other things need to be done to identify the structural properties of the TiO2 film so that it can provide a broader explanation of the surface morphology, pore structure, and other properties.
The main factor in the degradation process using photocatalysts is the light intensity which affects the number of photons and the amount of catalyst used to transmit light properly so that sufficient electron-hole pairs will be formed in the photodegradation process.
Online since: February 2020
Authors: Zulkhibri Ismail, Mohd Zuki Salleh, Siti Hanani Mat Yasin, Muhammad Khairul Anuar Mohamed
According to Darus [8] the surface geometries also affect the convective heat transfer process.
The study of ferrofluid on a flat plate conducted by Ramli et al. [13] on moving horizontal flat plate and vertical flat plate by Ilias et al. [14, 15] investigated the fluid interaction and the other factors that help to enhance the heat transfer.
The thermophysical properties of water and magnetite (Fe3O4) are listed in Table 1.
Thermophysical properties of base fluid and ferroparticles [34, 35] Physical Properties Water Magnetite (Fe3O4) (kg/m3) 997.1 5200 (J/kg·K) 4179 670 k (W/m·K) 0.613 6 0.05 25000 Table 2.
Conf. on ASME International Mechanical Engineering Congress & Exposition, San Francisco, USA. (1995) 99-105
The study of ferrofluid on a flat plate conducted by Ramli et al. [13] on moving horizontal flat plate and vertical flat plate by Ilias et al. [14, 15] investigated the fluid interaction and the other factors that help to enhance the heat transfer.
The thermophysical properties of water and magnetite (Fe3O4) are listed in Table 1.
Thermophysical properties of base fluid and ferroparticles [34, 35] Physical Properties Water Magnetite (Fe3O4) (kg/m3) 997.1 5200 (J/kg·K) 4179 670 k (W/m·K) 0.613 6 0.05 25000 Table 2.
Conf. on ASME International Mechanical Engineering Congress & Exposition, San Francisco, USA. (1995) 99-105
Online since: September 2017
Authors: Linda Y.L. Wu, Junaidi Junaidi, Edi Suharyadi, Kuwat Triyana, Harsojo Harsojo
PVA is much cheaper and higher mechanical properties compared to PVP [18–20].
Non-toxic properties of PVA make these polymers are safe to use on a larger scale [21].
Kim, Silver nanowire based flexible electrodes with improved properties: High conductivity, transparency, adhesion and low haze, Mater.
Ping, Poly(vinyl alcohol)/Poly(vinyl pyrrolidone) interpenetrating polymer network : synthesis and pervaporation properties, J.
May, Preparation and optical properties of silver nanowires and silver-nanowire thin films, J.
Non-toxic properties of PVA make these polymers are safe to use on a larger scale [21].
Kim, Silver nanowire based flexible electrodes with improved properties: High conductivity, transparency, adhesion and low haze, Mater.
Ping, Poly(vinyl alcohol)/Poly(vinyl pyrrolidone) interpenetrating polymer network : synthesis and pervaporation properties, J.
May, Preparation and optical properties of silver nanowires and silver-nanowire thin films, J.
Online since: April 2004
Authors: S.Y. Wang, Chun An Tang, Ming Li Huang, R.H.C. Wong, R.M. Jaio
While it is so hard for the analytical methods to study crack propagation and eventually
coalescence, considering the factor of heterogeneity of rock.
By introducing heterogeneity of rock properties into the model, the RFPA code can simulate non-linear deformation of a quasi-brittle behavior with an ideal brittle constitutive law for the local material; 2.
For heterogeneity, the material properties (failure-strength ³c and elastic modulus Ec ) for elements are randomly distributed throughout the specimen by following a Weibull distribution [6]: � � � � � � � � �� � � � �� � � � = m m m 0 1 00 exp µ µ µ µ µ � where ³ is the element strength and ³0 is the mean strength of the elements fro the specimen.
The geometrical and mechanical properties for all the specimens are listed in Table1.
Material properties for specimens Parameter Value Homogeneity index (m) 1.2,2,3,5,10 Mean compressive strength (³0) 200 (MPa) Mean elastic modulus (E0) 60,000 (MPa) Tension cutoff (¬) 10% Frictional angle (¶� 30o � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � = 5 � = 3 � = 2 � = 1 .2 Fig.2.
By introducing heterogeneity of rock properties into the model, the RFPA code can simulate non-linear deformation of a quasi-brittle behavior with an ideal brittle constitutive law for the local material; 2.
For heterogeneity, the material properties (failure-strength ³c and elastic modulus Ec ) for elements are randomly distributed throughout the specimen by following a Weibull distribution [6]: � � � � � � � � �� � � � �� � � � = m m m 0 1 00 exp µ µ µ µ µ � where ³ is the element strength and ³0 is the mean strength of the elements fro the specimen.
The geometrical and mechanical properties for all the specimens are listed in Table1.
Material properties for specimens Parameter Value Homogeneity index (m) 1.2,2,3,5,10 Mean compressive strength (³0) 200 (MPa) Mean elastic modulus (E0) 60,000 (MPa) Tension cutoff (¬) 10% Frictional angle (¶� 30o � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � = 5 � = 3 � = 2 � = 1 .2 Fig.2.