Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: June 2013
Authors: Jumril Yunas, Yeop Majlis Burhanuddin, Eka Pawinanto Roer
The parasitic influences of the material become dominant and cause an increase of the skin, proximity and eddy current effects.
Magnetic induction will be created in the material of the secondary coil via the electromagnetic coupling.
The isolation material used in this experiment is the SOG (Spin On Glass) solution (from Honeywell).
Thick aluminum is used as conductor material which is deposited using vacuum evaporation method.
Arshak, “Development of high frequency coreless transformer using thick film polymer technology”, Microelectronics Journal, Vol 30, 1999
Magnetic induction will be created in the material of the secondary coil via the electromagnetic coupling.
The isolation material used in this experiment is the SOG (Spin On Glass) solution (from Honeywell).
Thick aluminum is used as conductor material which is deposited using vacuum evaporation method.
Arshak, “Development of high frequency coreless transformer using thick film polymer technology”, Microelectronics Journal, Vol 30, 1999
Online since: August 2013
Authors: Zhong Qiang Tan, Ming Yan Zhao, Shi Jiao Wang
Use and to represent the amount of deformation of the positioning part and limit stop respectively, the distance r becomes:
(12)
According to elasticity mechanics, when the temperature increases from to , the total amount of deformation of the positioning part is:
(13)
Wherein P is the axial force exerted on the positioning part, is elastic modulus of the positioning part, is cross-sectional area of the positioning part, is the thermal expansion coefficient of material.
According to mechanics of materials, when the free end of cantilever beam is enforced by concentrated load, the maximum deflection of the free end is: (14) The formula (12) is rewritten as: (15) Using reliability analysis FOSM method, the mean and variance of the performance function Z are as follows: (16)(17) By plugging (16),(17) into (10),(11), reliability can be obtained.
Reliability calculation of the limit-locking mechanism Assumed that the design parameters are as follows: the respective component materials are assumed to be titanium alloy TC4, the elastic modulus is 206GPa, coefficient of variation is 0.1; thermal coefficient of linear expansion is; influence coefficient is ;, coefficient of variation is 0.1; the length of the positioning part is , cross-sectional area is;the diameter of the projection is ; the diameter of the lock-sliding pin’s big end is; the pin hole diameter is ; the chute diameter is ;the distance between pin hole mounting projection and limit stop is ; the length of limit stop is , inertia moment of limit stop is, room temperature is , temperature range is:.
The Development Status and Application of Spacecarft Verification and Test Standards[J].Chinese Space Science and Technology,2004(12):25-31.
(In Chinese) [10] Chen Jianjun,Chen Yong.Reliability analysis and simulation for kinematics accuracy of the flat four-bar mechanism[J].Journal of xidian university,2001,28(6):759-763.
According to mechanics of materials, when the free end of cantilever beam is enforced by concentrated load, the maximum deflection of the free end is: (14) The formula (12) is rewritten as: (15) Using reliability analysis FOSM method, the mean and variance of the performance function Z are as follows: (16)(17) By plugging (16),(17) into (10),(11), reliability can be obtained.
Reliability calculation of the limit-locking mechanism Assumed that the design parameters are as follows: the respective component materials are assumed to be titanium alloy TC4, the elastic modulus is 206GPa, coefficient of variation is 0.1; thermal coefficient of linear expansion is; influence coefficient is ;, coefficient of variation is 0.1; the length of the positioning part is , cross-sectional area is;the diameter of the projection is ; the diameter of the lock-sliding pin’s big end is; the pin hole diameter is ; the chute diameter is ;the distance between pin hole mounting projection and limit stop is ; the length of limit stop is , inertia moment of limit stop is, room temperature is , temperature range is:.
The Development Status and Application of Spacecarft Verification and Test Standards[J].Chinese Space Science and Technology,2004(12):25-31.
(In Chinese) [10] Chen Jianjun,Chen Yong.Reliability analysis and simulation for kinematics accuracy of the flat four-bar mechanism[J].Journal of xidian university,2001,28(6):759-763.
Online since: November 2015
Authors: Sivamani Seralathan, T. Mohan, A. Sudheer Kumar, T. Micha Premkumar
The cost of this type of wind turbine heavily relies on the blade design and material selection and hence optimised design and proper selection of materials are required for reducing the cost.
Premkumar, Dhiman Chatterjee, Numerical study of Turbulent flow over a ‘S’- shaped hydrofoil, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 222 (2007) 1717-1734
Thulasi ram, Numerical Analysis of Wells turbine, Applied Mechanics and Materials 592-594 (2014) 1125–1129
Premkumar, Dhiman Chatterjee, Numerical study of Turbulent flow over a ‘S’- shaped hydrofoil, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 222 (2007) 1717-1734
Thulasi ram, Numerical Analysis of Wells turbine, Applied Mechanics and Materials 592-594 (2014) 1125–1129
Online since: March 2014
Authors: Jie Huang, Yong Gang Kang, Guo Rong Yang, Jing Hang Zhu
The total static deflection at node (k, n) is calculated by the superposition of all the deflections produced by the possible nodal forces:
(3)
Fig. 2 Modelling of the peripheral milling of thin-walled workpiece using ABAQUS
As shown in Fig.2, a deflection analysis model for the peripheral milling of thin-walled workpiece using ABAQUS is developed, which include the cutting loads defining, material removing, the iterative algorithm carrying out, the result data automatically picking and mapping.
The material is removed by boolean calculation of workpiece and cutting tool following the cutting path feed by feed.
The workpiece material is Al7075-T6, which are extensively used for low rigidity workpieces, e.g., jet engine compressor blades in aeronautical and aerospace industries.
Acknowledgments This project is supported by National Natural Science Foundation of China (Grant No. 51375396).
On cutter deflection surface errors in peripheral milling[J], Journal of Materials Processing Technology, 2012,212: 2443-2454
The material is removed by boolean calculation of workpiece and cutting tool following the cutting path feed by feed.
The workpiece material is Al7075-T6, which are extensively used for low rigidity workpieces, e.g., jet engine compressor blades in aeronautical and aerospace industries.
Acknowledgments This project is supported by National Natural Science Foundation of China (Grant No. 51375396).
On cutter deflection surface errors in peripheral milling[J], Journal of Materials Processing Technology, 2012,212: 2443-2454
Online since: September 2015
Authors: S.C. Sharma, Srinivasan Nagapriya, H. Sreemoolanadhan, M.R. Ajith, Mariamma Mathew
Hydrophobic silica aerogels by ambient pressure drying
S Nagapriya*, M R Ajith, H Sreemoolanadhanb,
Mariamma Mathew, S C Sharma
Materials & Metallurgy Group, Vikram Sarabhai Space Centre, Trivandrum, 695022, India
*priyakvk@gmail.com, s_nagapriya@vssc.gov.in
Keywords: sol-gel, aerogel, ambient pressure drying
Abstract.
Introduction Silica aerogels are low density, low thermal conductivity materials which have pore size in the range 1-60nm.
Figure 1: Granular silica aerogel Results and Discussions Hydrolysis of sol in presence of NH4F [[2] Brinker & Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing, Academic Press, 1990 ] is as given by Eq.-1.
This drastically decreases the gelation time [[3] Rao et al, Rapid reduction in gelation time and impregnation of hydrophobic property in the tetraethoxysilane based silica aerogels using NH4F catalyzed single step sol–gel process, Journal of Alloys and Compounds 480 (2009) 689–695 ]
Pore volume & pore size were calculated to be 6 cm3/g & 30-50 nm respectively which establishes the material as ‘mesoporous’.
Introduction Silica aerogels are low density, low thermal conductivity materials which have pore size in the range 1-60nm.
Figure 1: Granular silica aerogel Results and Discussions Hydrolysis of sol in presence of NH4F [[2] Brinker & Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing, Academic Press, 1990 ] is as given by Eq.-1.
This drastically decreases the gelation time [[3] Rao et al, Rapid reduction in gelation time and impregnation of hydrophobic property in the tetraethoxysilane based silica aerogels using NH4F catalyzed single step sol–gel process, Journal of Alloys and Compounds 480 (2009) 689–695 ]
Pore volume & pore size were calculated to be 6 cm3/g & 30-50 nm respectively which establishes the material as ‘mesoporous’.
Online since: October 2012
Authors: Yong Feng Qi, Qin Chen, Ya Qi Gong
C40 concrete
Zone A
C25 concrete
(a)Finite element mesh (b) material zoning of concrete
Fig.1 The numerical model
The material parameters used in this analysis are shown in table 1.
Table 1 Material parameters Category Yougth modulus(GPa) Poisson's ratio Specific weight (kN/m3) Standard tensile strength(MPa) C25 Concrete 28 0.167 25.0 1.75 C40 Concrete 32.5 0.167 25.0 2.45 Steels 210 0.3 78.5 - Reinforced bars 210 0.0 0.0 - Cushion 0.0025 - - - Bedrock 35 0.2 - The loads include gravity, internal water pressure of spiral case, the floor loads and unit loads.
Reinforcement and computational scheme Computational schemes are established by considering the design conditions such as, the laying range of cushion, the reinforcement, the material zoning and tensile strength of concrete, as list in Table 2.
Vo1.40 (2009), P.37 [2] J.J.Jiang: Nonliner finite element analysis on Reinforced concrete structure(Shanxi Science and Technology Press, Xi’an, 1994) [3] Q.Ch, Sh.Z.
Zhang: Journal of Yangtze River Scientific Research Institute.
Table 1 Material parameters Category Yougth modulus(GPa) Poisson's ratio Specific weight (kN/m3) Standard tensile strength(MPa) C25 Concrete 28 0.167 25.0 1.75 C40 Concrete 32.5 0.167 25.0 2.45 Steels 210 0.3 78.5 - Reinforced bars 210 0.0 0.0 - Cushion 0.0025 - - - Bedrock 35 0.2 - The loads include gravity, internal water pressure of spiral case, the floor loads and unit loads.
Reinforcement and computational scheme Computational schemes are established by considering the design conditions such as, the laying range of cushion, the reinforcement, the material zoning and tensile strength of concrete, as list in Table 2.
Vo1.40 (2009), P.37 [2] J.J.Jiang: Nonliner finite element analysis on Reinforced concrete structure(Shanxi Science and Technology Press, Xi’an, 1994) [3] Q.Ch, Sh.Z.
Zhang: Journal of Yangtze River Scientific Research Institute.
Online since: January 2005
Authors: J.H. Yoon, I.S. Kim, H.S. Kim, I.C. Hur, K.S. Son, Je Hyun Lee, H.S. Kim
Kim
2
1
Dept. of Metallurgy & Materials Science, Changwon National Univ., Changwon 641-773, Korea
2
Korea Electrotechnology Research Institute, Changwon 641-120, Korea
a
fuha1004@cosmos.changwon.ac.kr, b iskim@doosanheavy.com, c inchang76@hanmail.net.
"Search for an Improved Steam Material for Fossil Fired Steam Turbine", TR79MPL3158, 1/14 /1980
"Oxidation of LST-GValve Steam Bushing Materials-A Progress Report", TR81MPL378, 5/7/1981 [3] J.
Board, British Nuclear Energy Society Technical Journal, Vol.13 (1974) p. 211
"Search for an Improved Steam Material for Fossil Fired Steam Turbine", TR79MPL3158, 1/14 /1980
"Oxidation of LST-GValve Steam Bushing Materials-A Progress Report", TR81MPL378, 5/7/1981 [3] J.
Board, British Nuclear Energy Society Technical Journal, Vol.13 (1974) p. 211
Online since: February 2006
Authors: Li Jie Ma, Gui Cheng Wang, Hong Jie Pei, Ju Dong Liu, Z.H. Jia
Experimental Method and Material
The experimental material selected was 40Cr steel, initially hardened and tempered.
Compared with one-pass grinding, the yield strength of surface layer material in two-pass grinding sample is much larger and its grinding temperature higher, leading to the increase of thermal stress.
Zhang: Journal of Materials Science, Vol.37 (2002) No.18, pp.3935-3943
Compared with one-pass grinding, the yield strength of surface layer material in two-pass grinding sample is much larger and its grinding temperature higher, leading to the increase of thermal stress.
Zhang: Journal of Materials Science, Vol.37 (2002) No.18, pp.3935-3943
Online since: May 2013
Authors: Bang Xu, Mo Chu, Ai Bang Hong, Feng Ling Zhang
The raw lignite and its briquette were sieved to 6-13mm as experiment material.
It can be concluded that the pyrolysis gas with high content of CO and H2 is a good raw material for synthesis of methanol that based on synthesis of carbonyl.
Characteristics of Pyrolysis Products of Bori Lignite Briquette. 2012 International Conference on Future Energy, Environment, and Materials, Energy Procedia, Volume 16, Part A, 2012, Pages 307-313
Journal of Fuel Chemistry and Technology, 1995, 23 (1)
Preparation and performance study on lignite briquette coke, 2009 International Conference on Environmental Science and Information Application Technology[C].2009:190-193
It can be concluded that the pyrolysis gas with high content of CO and H2 is a good raw material for synthesis of methanol that based on synthesis of carbonyl.
Characteristics of Pyrolysis Products of Bori Lignite Briquette. 2012 International Conference on Future Energy, Environment, and Materials, Energy Procedia, Volume 16, Part A, 2012, Pages 307-313
Journal of Fuel Chemistry and Technology, 1995, 23 (1)
Preparation and performance study on lignite briquette coke, 2009 International Conference on Environmental Science and Information Application Technology[C].2009:190-193
Online since: May 2011
Authors: De Guang Meng, Shu Yuan Xu, Tian Zhi Zhu, Peng Fei Wang
Analysis on Harmonious Relations Between Development Strategies of Real Estate and Urbanization
De guang Meng1, a, Shu yuan Xu1,b , Tian zhi Zhu1, b, Pengfei Wang1, b
1College of Urban construction, Hebei Normal University of Science & Technology, Qinhuangdao, Hebei, 066004, China
amengdg@126.com,bcsjsxybgs@126.com
Keywords: Real Estate Industry, Urbanization, Development Strategies.
In architectural designs, the function and quality of the houses are neglected, the structural design is unreasonable and the technology is imperfect, and the quality is low, which results in not only the unnecessary waste in materials but also the dangers in quality and safety.
As most of the house construction is technically low, the new material, technology, design and craft are seldom used in building houses, so that the quality of the houses cannot well satisfy the requirements of consumers.
Next in the construction, new technology, craft and new materials should be used to realize high quality, low consumption and low costs.
Journal of Chongqing Jianzhu University, Vol 29,(2007) , p.106 [2] B.Yang.
In architectural designs, the function and quality of the houses are neglected, the structural design is unreasonable and the technology is imperfect, and the quality is low, which results in not only the unnecessary waste in materials but also the dangers in quality and safety.
As most of the house construction is technically low, the new material, technology, design and craft are seldom used in building houses, so that the quality of the houses cannot well satisfy the requirements of consumers.
Next in the construction, new technology, craft and new materials should be used to realize high quality, low consumption and low costs.
Journal of Chongqing Jianzhu University, Vol 29,(2007) , p.106 [2] B.Yang.