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Online since: January 2019
Authors: Dorcas A. Ayeni, Olaniyi O. Aluko, Morisade O. Adegbie
Its purpose and function is primarily to control the internal physical environmental factors, such as, heat, light and sound.
In tropical environment, solar radiation is one of the factors responsible for the thermal load of buildings.
The heat flow between outdoor and indoor will depend on the building envelope and the thermal and physical properties of building elements.
Vegetation affects air quality through pollutant dispersion and deposition [26].
Urban form and Socio-Demographic Factors, Influence Yard Vegetation, Visitation and Ecosystem Service Benefits.
In tropical environment, solar radiation is one of the factors responsible for the thermal load of buildings.
The heat flow between outdoor and indoor will depend on the building envelope and the thermal and physical properties of building elements.
Vegetation affects air quality through pollutant dispersion and deposition [26].
Urban form and Socio-Demographic Factors, Influence Yard Vegetation, Visitation and Ecosystem Service Benefits.
Online since: September 2012
Authors: Rosemary S. Gault, Keith Ridgway, Gustavo A. Escobar-Palafox
Table 1 provides a list of the DoE factors and their corresponding levels.
Fig. 3 Micrograph showing subsurface deformation (P=3447.37 bar; m=0.55kg/min; Tr=35mm/min; Abr=80grit) Fig. 4 Scaled and centred regression coefficients for kerf taper The factors that had a statistically significant effect on the maximum level of subsurface deformation are shown in Fig. 4.
Abrasive mass flow rate and grit size are the main factors that affect the level of deformation in the subsurface.
Shipway, Abrasive waterjet of a titanium alloy: The influence of abrasive morphology and mechanical properties on workpiece grit embedment and cut quality, Journal of Materials Processing Technology, 210 (2010) 2197-2205
Qu, Statistical properties of Rechschaffner designs, Journal of Statistical Planning and Inference, 137 (2007) 2156-2164.
Fig. 3 Micrograph showing subsurface deformation (P=3447.37 bar; m=0.55kg/min; Tr=35mm/min; Abr=80grit) Fig. 4 Scaled and centred regression coefficients for kerf taper The factors that had a statistically significant effect on the maximum level of subsurface deformation are shown in Fig. 4.
Abrasive mass flow rate and grit size are the main factors that affect the level of deformation in the subsurface.
Shipway, Abrasive waterjet of a titanium alloy: The influence of abrasive morphology and mechanical properties on workpiece grit embedment and cut quality, Journal of Materials Processing Technology, 210 (2010) 2197-2205
Qu, Statistical properties of Rechschaffner designs, Journal of Statistical Planning and Inference, 137 (2007) 2156-2164.
Online since: February 2012
Authors: Yuan Sheng Huang, Cheng Ping Luo, Wan Qi Qiu
Effect of Oxygen on CVD Diamond Film Deposition
Yuan-Sheng Huang1, 2,a, Cheng-Ping Luo2, Wan-Qi Qiu2
1 Department of Materials Technology, Jiangmen Polytechnic, Jiangmen 529090, China
2 College of Mechanical Engineering, South China University of Technology, Guangzhou, China
a nightofgz@163.com
Keywords: diamond film, chemical vapor deposition (CVD), oxygen
Abstract.
Introduction Similar to nature diamond, CVD diamond also shows excellent properties such as high hardness, good wear resistance, low friction coefficient and high thermal conductivity.
The CVD diamond films with a smaller grain size showed a better mechanical property and a better adhesion with the substrate.
The factors affecting the CVD diamond deposition include deposition atmosphere, temperature, substrate, etc [4,5].
Introduction Similar to nature diamond, CVD diamond also shows excellent properties such as high hardness, good wear resistance, low friction coefficient and high thermal conductivity.
The CVD diamond films with a smaller grain size showed a better mechanical property and a better adhesion with the substrate.
The factors affecting the CVD diamond deposition include deposition atmosphere, temperature, substrate, etc [4,5].
Online since: November 2010
Authors: Xian Fa Li
The suitable process conditions of preparing the blend films with good water-resistance and mechanical properties were determined by single-factor experiments.
SEM, FT-IR, TGA and DSC analysis were performed to examine the contribution of LS and borax to the properties of the blend films.
Each value of mechanical properties reported was an average of three specimens.
Results and discussion Mechanical properties The effects of the LS content on the tensile strength (σb) and elongation at break (εb) for the blend films were shown in Fig.1.
Thermal properties Fig. 7.
SEM, FT-IR, TGA and DSC analysis were performed to examine the contribution of LS and borax to the properties of the blend films.
Each value of mechanical properties reported was an average of three specimens.
Results and discussion Mechanical properties The effects of the LS content on the tensile strength (σb) and elongation at break (εb) for the blend films were shown in Fig.1.
Thermal properties Fig. 7.
Online since: November 2012
Authors: Koichi Kikuta, Ill Yong Kim, Chikara Ohtsuki
The biological and mechanical properties of the bone tissues depend on the morphology and organized structure of HAp crystals.
Since morphology of HAp crystals formed under hydrothermal condition are affected by some factors such as solubility of a starting material, processing temperature pH of solvent and additives in the solvent [4], the condition on the formation of the oriented structure has not been clarified yet.
In the present study, we focused on difference of reactivity of crystal planes because the HAp formation on calcite single crystals might be affected by the dissolution rate of each plane in a phosphate solution.
The HAp formation is affected by dissolution rate of calcite.
Wei, Hydroxyapatite needle-shaped particles/poly(L-lactic acid) electrospun scaffolds with perfect particle-along-nanofiber orientation and significantly enhanced mechanical properties, J.
Since morphology of HAp crystals formed under hydrothermal condition are affected by some factors such as solubility of a starting material, processing temperature pH of solvent and additives in the solvent [4], the condition on the formation of the oriented structure has not been clarified yet.
In the present study, we focused on difference of reactivity of crystal planes because the HAp formation on calcite single crystals might be affected by the dissolution rate of each plane in a phosphate solution.
The HAp formation is affected by dissolution rate of calcite.
Wei, Hydroxyapatite needle-shaped particles/poly(L-lactic acid) electrospun scaffolds with perfect particle-along-nanofiber orientation and significantly enhanced mechanical properties, J.
Online since: June 2020
Authors: Achmad Bakri Muhiddin, Maraden Panjaitan, Lawalenna Samang, Tri Harianto
The summary of index properties of soil tested was shown in Table 1.
Table 1 Soil properties index test results Parameter Value Testing Method 1.
The soil used in the study was classified as clay type or CH by USCS which has chracteristics that the change in water content will affect the value of the shear strength. 2.
Thermo-hydro-mechanical simulation of atlas in situ large scale test in Boom clay.
Factors affecting the interpretation of the in-situ shear vane test (Doctoral dissertation, University of Surrey). (1980)
Table 1 Soil properties index test results Parameter Value Testing Method 1.
The soil used in the study was classified as clay type or CH by USCS which has chracteristics that the change in water content will affect the value of the shear strength. 2.
Thermo-hydro-mechanical simulation of atlas in situ large scale test in Boom clay.
Factors affecting the interpretation of the in-situ shear vane test (Doctoral dissertation, University of Surrey). (1980)
Online since: July 2014
Authors: Wei Zhang, Min Li Zheng, Jin Hui Xu, Zhao Xing Zhang, Tong Wu
The impact of hardened steel milling surface structure
on mould service load
Minli Zheng1,a, Jinhui Xu1,b , Wei Zhang1,2,c, Zhaoxing Zhang1, Tong Wu1
1College of Mechanical and Power Engineering, Harbin University Science And Technology, Harbin in Heilongjiang province 150080, China
2Measurement-control Technology and Instrument Key Laboratory of Universities in Heilongjiang province, Harbin University Science And Technology, Harbin in Heilongjiang province 150080, China
aemail:minli@hrbust.edu.cn, bemail:583391331@qq.com, cemail:zhangwei1977@hrbust.edu.cn
Keywords: hardened steel; milling surface structure; numerical simulation; service load
Abstract.
Mould surface loading state is one of the most important factors which would affect the mould performance in the course of service.
Milling surface integrity seriously affects the service performance of hardened steel, mould failure behavior such as wear and fatigue which not only depend on the material properties, but also relate to the load state[1-4].
It can be seen from table 4 that machining parameters will affect the density of machined surface geometry structure.
Through the above analysis, it can be know that the mould machined surface load distribution is seriously affectted by the change of surface geometry structure.
Mould surface loading state is one of the most important factors which would affect the mould performance in the course of service.
Milling surface integrity seriously affects the service performance of hardened steel, mould failure behavior such as wear and fatigue which not only depend on the material properties, but also relate to the load state[1-4].
It can be seen from table 4 that machining parameters will affect the density of machined surface geometry structure.
Through the above analysis, it can be know that the mould machined surface load distribution is seriously affectted by the change of surface geometry structure.
Online since: September 2013
Authors: Tao Yu, Jian Jun Shi, Si Li Chen, Jie Huang, Kai He Dong
Therefore, because of many factors affected the performance of cement soil, such as varieties of cement, strength class, mixing ratio, age as well as the surrounding environment, it is very necessary for many researches to carry out the experiments on the physical performance and mechanical property of cement soil.
Xiaodong Tong, Jun Wang, Xiaolei Ji, Renwang Liang and Xiaoqiang Dong [5-6] have carried out several experimental study of the mechanical property of the cement soil.
However, because the cement soil tends to be used in the pits anti-seepage, embankment impermeable walls, and bears the erosion and seepage of groundwater, it is particularly important to evaluate how the groundwater seepage will affect the cement soil physical and mechanical parameters and how long the cement soil engineering will be in use.
The mixing ratio of cement soil The tested cement soil of undisturbed soil taken from silty clay in a road based in Shenyang City, which is soft plastic state in the natural state, and its main physical properties of the indicators are shown in Table 1.
In short, cement soil initial void ratio was affected by the infiltration time.
Xiaodong Tong, Jun Wang, Xiaolei Ji, Renwang Liang and Xiaoqiang Dong [5-6] have carried out several experimental study of the mechanical property of the cement soil.
However, because the cement soil tends to be used in the pits anti-seepage, embankment impermeable walls, and bears the erosion and seepage of groundwater, it is particularly important to evaluate how the groundwater seepage will affect the cement soil physical and mechanical parameters and how long the cement soil engineering will be in use.
The mixing ratio of cement soil The tested cement soil of undisturbed soil taken from silty clay in a road based in Shenyang City, which is soft plastic state in the natural state, and its main physical properties of the indicators are shown in Table 1.
In short, cement soil initial void ratio was affected by the infiltration time.
Online since: November 2012
Authors: Rui Bao, Jian Yu Zhang, Xiao Chen Zhao, Ting Zhang
Most strength and fatigue properties available are in L-T orientation [1].
To understand the factors leading to crack branching in 7050-T7451, further experimental investigations are conducted and reported in this paper.
The mechanical properties are also available in [1], i.e. tensile Strength 510 MPa, yield strength 441MPa, elongation 9%, KIC values for thin plate (25-51 mm) L-T 31.9 MPa, T-L 27.5 MPa, S-L N/A and for thick plate (127-152 mm) L-T 26.4 MPa, T-L 24.2 MPa, S-L 23.1 MPa.
DK. da/dN was computed by incremental polynomial method, and the corresponding stress intensity factors were calculated using the expression recommended by ASTM E647 (2011).
The tests in this study show that (1) under CA loading conditions, the DK-levels that dominant the changing points of the da/dN~DK curve, see Fig.2, agree quite well with the result of Schubbe; (2) DK is not the only factor which affected the crack splitting, see Fig. 5, macro-noticeable crack splitting appears only in the high R ratio condition; (3) the tests under constant DK of R =0.5 indicates that R is not the only factor which affected the crack splitting either, see Fig. 6 and 4, remarkable macro-level crack splitting was not observed in the high R ratio test of DK= 15 MPa.
To understand the factors leading to crack branching in 7050-T7451, further experimental investigations are conducted and reported in this paper.
The mechanical properties are also available in [1], i.e. tensile Strength 510 MPa, yield strength 441MPa, elongation 9%, KIC values for thin plate (25-51 mm) L-T 31.9 MPa, T-L 27.5 MPa, S-L N/A and for thick plate (127-152 mm) L-T 26.4 MPa, T-L 24.2 MPa, S-L 23.1 MPa.
DK. da/dN was computed by incremental polynomial method, and the corresponding stress intensity factors were calculated using the expression recommended by ASTM E647 (2011).
The tests in this study show that (1) under CA loading conditions, the DK-levels that dominant the changing points of the da/dN~DK curve, see Fig.2, agree quite well with the result of Schubbe; (2) DK is not the only factor which affected the crack splitting, see Fig. 5, macro-noticeable crack splitting appears only in the high R ratio condition; (3) the tests under constant DK of R =0.5 indicates that R is not the only factor which affected the crack splitting either, see Fig. 6 and 4, remarkable macro-level crack splitting was not observed in the high R ratio test of DK= 15 MPa.
Online since: February 2008
Authors: Ling Hong Guo, Shan Shan Wei, Yi Ping Tian, Hui Li, Qiang Cheng
Pilliar reported that CPP exhibited better mechanical properties and degradability
compared with HA [3, 4].
A universal testing machine was used to characterize the mechanical property at room temperature.
It indicated that the presence of Ca2P2O7 affected the CPP crystallization, and induced the amorphous CPP to transfer to crystalline CPP.
The XRD results show that the Ca/P ratios were important factors in phase structures of the ground powders and sintered ceramics, and there was obvious interaction between [Ca(PO3)2]n and Ca2P2O7 in sintering process.
Figure 3 indicated that sintering temperature and Ca/P ratios had significant influence on the mechanical properties of the ceramics.
A universal testing machine was used to characterize the mechanical property at room temperature.
It indicated that the presence of Ca2P2O7 affected the CPP crystallization, and induced the amorphous CPP to transfer to crystalline CPP.
The XRD results show that the Ca/P ratios were important factors in phase structures of the ground powders and sintered ceramics, and there was obvious interaction between [Ca(PO3)2]n and Ca2P2O7 in sintering process.
Figure 3 indicated that sintering temperature and Ca/P ratios had significant influence on the mechanical properties of the ceramics.