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Online since: December 2012
Authors: Asam M.A. Abudalazez, Azlan B. Ariffin, Zainal Arifin Ahmad, Shah Rizal Kasim
Metals and alloys have been widely used in various forms as implants due to their mechanical properties.
In summary, the results show that the BCP powder concentration in suspension plays a key role besides other factors that affect deposition rate.
These results are agreement with those of Wang et al [7], which found the HA concentration in suspension and the strength of electric field can similarly affect the deposition rate.
This indicated that BCP powder concentration in suspension plays as a key role, besides other factors, in coating deposition rate.
In summary, the results show that the BCP powder concentration in suspension plays a key role besides other factors that affect deposition rate.
These results are agreement with those of Wang et al [7], which found the HA concentration in suspension and the strength of electric field can similarly affect the deposition rate.
This indicated that BCP powder concentration in suspension plays as a key role, besides other factors, in coating deposition rate.
Online since: September 2019
Authors: Ching Lun Li, Yung Kuan Ni, Yang Haw, Yuung Hwa Lu
Hamilton et al. [1] discussed the effects of tool speed, tool feed rate, feed rate, and forming bevel on the surface roughness and structural properties after forming.
Suresh et al. [9] found that the procedural properties of different geometries can be verified using Ls-Dyna, which is a numerical simulation software, alongside actual incremental forming experiments.
Lu et al. [10] showed that the tool path is a key factor in the incremental sheet forming process.
A series of tensile tests were performed to obtain the following properties: yield stress σy = 160.0 MPa; Young’s modulus E = 210 GPa; Poisson’s ratio ν = 0.3; and stress–strain constitutive equation MPA.
The forming properties of SPIF using a spiral evolutional snail-line tool path and other equal height evolutional tool paths were compared.
Suresh et al. [9] found that the procedural properties of different geometries can be verified using Ls-Dyna, which is a numerical simulation software, alongside actual incremental forming experiments.
Lu et al. [10] showed that the tool path is a key factor in the incremental sheet forming process.
A series of tensile tests were performed to obtain the following properties: yield stress σy = 160.0 MPa; Young’s modulus E = 210 GPa; Poisson’s ratio ν = 0.3; and stress–strain constitutive equation MPA.
The forming properties of SPIF using a spiral evolutional snail-line tool path and other equal height evolutional tool paths were compared.
Online since: March 2015
Authors: Mohand Ould Ouali, Rachid Djeridi
Elastomer performance is particularly relevant in the field of power drive, in sealing application where adhesion and friction properties are important aspects.
Many additives such as plasticizer, curing agent, protection agent, etc., are added to ease elastomer manufacturing and to increase its mechanical properties.
Two main factors contribute to the friction between surfaces in dry relative motion [7, 8].
If no coupling exists between these two factors, the friction coefficient be written (µ=µadhesive+µdeformation).
Li, Modification of Archard’s equation by taking account of elastic/ pseudoelastic properties of materials, Wear, 251(2001) 956–964
Many additives such as plasticizer, curing agent, protection agent, etc., are added to ease elastomer manufacturing and to increase its mechanical properties.
Two main factors contribute to the friction between surfaces in dry relative motion [7, 8].
If no coupling exists between these two factors, the friction coefficient be written (µ=µadhesive+µdeformation).
Li, Modification of Archard’s equation by taking account of elastic/ pseudoelastic properties of materials, Wear, 251(2001) 956–964
Online since: October 2021
Authors: Moses E. Emetere, Kevin Chinwuba Igwilo, Emeka Emmanuel Okoro, Samuel E. Sanni, Ikechukwu S. Okafor, Sociis T.A. Okolie
In order to effectively control the properties of the formulated mud system, it is important to know how specific changes in mud composition will affect the properties.
It is comparatively easy to formulate mud systems with suitable properties but more difficult to maintain those properties while drilling.
Because, the basic factors which affect flow property of an aqueous mud system are the viscosity of the base fluid (water), the size, shape and quantity of suspended particles and the forces existing between particles, as well as between particles and fluid.
Fig. 2: Rheological test results of the mud samples with Cellulosic Filtrate Loss Modifier For some fluids the viscosity can be expressed through a coefficient, but for most fluids it is more a factor dependent on other properties.
Fibers are responsible for composite properties like thermal, mechanical, durability, and life prediction.
It is comparatively easy to formulate mud systems with suitable properties but more difficult to maintain those properties while drilling.
Because, the basic factors which affect flow property of an aqueous mud system are the viscosity of the base fluid (water), the size, shape and quantity of suspended particles and the forces existing between particles, as well as between particles and fluid.
Fig. 2: Rheological test results of the mud samples with Cellulosic Filtrate Loss Modifier For some fluids the viscosity can be expressed through a coefficient, but for most fluids it is more a factor dependent on other properties.
Fibers are responsible for composite properties like thermal, mechanical, durability, and life prediction.
Online since: June 2013
Authors: Zhi Wei Guan, Guang Hui Yan, Shao Hua Wang, Chen Fu Liu
Active suspension control unit will appear a series of time-delay factor in the control loop.
The pavement vertical disturbance need to be monitored by preview sensor and estimated by Kalman Filter. 2.2 PID Control of Active Suspension If the is smaller then the ride comfort and comfort properties of vehicle is better.
-4.33,4.15) 0.5140 1.3017 passive suspension (-0.62,0.76) (-4.41,4.32) 0.3017 1.1175 By analysis to Fig.2, Fig.3 and Table 2 we can get the results: 1) With the system time-delay increases the amplitude range and root mean square value of sprung mass vertical acceleration are gradually increasing. 2) Take the critical time-delay τ=0.153s to do simulation test, and compared with PID control which has no time-delay, the system amplitude increased 1.2 time or so, but the appearing moment of wave crest and trough is almost invariant, the active suspension is in critical stability. 3) Take the critical time-delay τ=0.18s to do simulation test, and compared with PID control which has no time-delay, the amplitude of sprung mass vertical acceleration increased dramatically 2.5 times, and the appearing moment of wave crest and trough have reverse chaos, which shows that the system appear unstable chaotic vibration state.. 4) The total time-delay value of active suspension system is the key factors
which affect the integral control effect. 5 Conclusion 1) According to the theory of linear ordinary differential equation which contains time-delay and according to the Routh-Hurwitz stability criterion the system stable conditions directly related to the parameters,,,and,,.
Vehicle active suspension system using skyhook adaptive neuro active force control [J].Mechanical systems and signal processing 2009(23): 855–868
The pavement vertical disturbance need to be monitored by preview sensor and estimated by Kalman Filter. 2.2 PID Control of Active Suspension If the is smaller then the ride comfort and comfort properties of vehicle is better.
-4.33,4.15) 0.5140 1.3017 passive suspension (-0.62,0.76) (-4.41,4.32) 0.3017 1.1175 By analysis to Fig.2, Fig.3 and Table 2 we can get the results: 1) With the system time-delay increases the amplitude range and root mean square value of sprung mass vertical acceleration are gradually increasing. 2) Take the critical time-delay τ=0.153s to do simulation test, and compared with PID control which has no time-delay, the system amplitude increased 1.2 time or so, but the appearing moment of wave crest and trough is almost invariant, the active suspension is in critical stability. 3) Take the critical time-delay τ=0.18s to do simulation test, and compared with PID control which has no time-delay, the amplitude of sprung mass vertical acceleration increased dramatically 2.5 times, and the appearing moment of wave crest and trough have reverse chaos, which shows that the system appear unstable chaotic vibration state.. 4) The total time-delay value of active suspension system is the key factors
which affect the integral control effect. 5 Conclusion 1) According to the theory of linear ordinary differential equation which contains time-delay and according to the Routh-Hurwitz stability criterion the system stable conditions directly related to the parameters,,,and,,.
Vehicle active suspension system using skyhook adaptive neuro active force control [J].Mechanical systems and signal processing 2009(23): 855–868
Online since: June 2025
Authors: Meshack Hawi, Hiram Ndiritu, Jackline Mwende Mutunga, Peter Oketch
For an effective cycle, these factors should be evaluated and optimized.
Similarly, a low percentage of volatile matter signifies improved adsorption properties [37].
Microstructural properties of activated carbon pellets.
Statistical metrics, including degree of freedom (dF), the sum of squares (SS), and contribution percentage, as well as F and p-values, evaluated the significance of each factor and the interaction effect among factors.
This indicated that the higher surface area-to-volume ratio of the adsorbent enhanced the adsorption process, positively affecting the methane purity obtained.
Similarly, a low percentage of volatile matter signifies improved adsorption properties [37].
Microstructural properties of activated carbon pellets.
Statistical metrics, including degree of freedom (dF), the sum of squares (SS), and contribution percentage, as well as F and p-values, evaluated the significance of each factor and the interaction effect among factors.
This indicated that the higher surface area-to-volume ratio of the adsorbent enhanced the adsorption process, positively affecting the methane purity obtained.
Online since: June 2012
Authors: Chi Hao Yeh, Jay C.Y. Huang, Chang Ming Hu
The objective is to detect various relevant physical factors that cause the patient to suffer from bed sores, combining the patient bed’s various mechanical functions by regulating the various physical factors within an acceptable range, which would in turn proactively prevent the formation of bed sores[6].The innovative design process and its application to the body-turning, back-patting intelligent patient bed started by gathering and sorting the data to identify the causes of bed sores and identifying the spots that bed sores are prone to occur.
Physical properties that can be sensed include temperature, pressure, vibration, sound level, light intensity, load or weight, flow rate of gases and liquids, amplitude of magnetic and electronic fields, and concentrations of many substances in gaseous, liquid, or solid form [20].
Physical properties that can be sensed include temperature, pressure, vibration, sound level, light intensity, load or weight, flow rate of gases and liquids, amplitude of magnetic and electronic fields, and concentrations of many substances in gaseous, liquid, or solid form [26].
This segment of the study aims to indentify the quantifiable data of the physical factors, which would be used as the design input and parameter criteria in the intelligent logic design. 4.1 The design and selection of the sensors It focuses on how best to execute the measurement based on how the various physical factors affect the formation of bed sores, and what types of sensors are to be selected based on the anticipated performance and cost consideration.
The following provides an analysis based on the location factor and time factor. 4.4.2.
Physical properties that can be sensed include temperature, pressure, vibration, sound level, light intensity, load or weight, flow rate of gases and liquids, amplitude of magnetic and electronic fields, and concentrations of many substances in gaseous, liquid, or solid form [20].
Physical properties that can be sensed include temperature, pressure, vibration, sound level, light intensity, load or weight, flow rate of gases and liquids, amplitude of magnetic and electronic fields, and concentrations of many substances in gaseous, liquid, or solid form [26].
This segment of the study aims to indentify the quantifiable data of the physical factors, which would be used as the design input and parameter criteria in the intelligent logic design. 4.1 The design and selection of the sensors It focuses on how best to execute the measurement based on how the various physical factors affect the formation of bed sores, and what types of sensors are to be selected based on the anticipated performance and cost consideration.
The following provides an analysis based on the location factor and time factor. 4.4.2.
Online since: September 2013
Authors: Zhan Bin Huang, Lu Han Liu, Wu Nan Li, En Tong Liu, Yu Xuan Sun, Xin Gan Hu
In addition to the physical and mechanical methods to remove snow and ice, chemical deicing salt has been used widely in recent years, because of its low cost, high efficiency and its convenience.
The soil of the central green belt in highway is sandy loam, among which there are clay(16.3%) , silt(59.27%) and sand(24.5%), and the soil properties are organic matter content 26.5g/kg, soil bulk density 1.39g/cm3, the field capacity 193g/kg, pH 7.81, total nitrogen 1.1g/kg, available nitrogen 45mg/kg, available phosphorus 121mg/kg and available potassium 232mg/kg.
Effect on soil pH and the EC in experimental treatments Soil Depth cm CK 4.5t/hm2 7.5t/hm2 12t/hm2 pH EC us/cm pH EC us/cm pH EC us/cm pH EC us/cm 0-20 8.3 114.7 7.9 108.3 8.0 113.0 8.3 112.0 20-40 8.4 116.1 8.1 104.7 8.3 114.1 8.2 119.7 40-60 8.3 118.2 8.2 129.9 8.3 125.1 8.1 115.2 The Effect of SFO on Soil Ion Structure and Salinization Improvement The chemical ions of soil are the material basis for the plant growth, and also the environmental factor that affects plant growth.
Soil Chlorine Ion Concentration The chloride ion is an important factor of destroying the soil granular structure and inhibiting the plant photosynthesis, and its content affects the soil quality of green belts inevitably as well as the plant photosynthesis and plant growth.
The ion toxicity to plants is mainly affected by excess of Na + and Cl –[17].The excessive accumulation of Na+ and Cl- within the cytoplasm can interrupt the plant moisture and the steady state of ions, and affects ion absorption at the same time.
The soil of the central green belt in highway is sandy loam, among which there are clay(16.3%) , silt(59.27%) and sand(24.5%), and the soil properties are organic matter content 26.5g/kg, soil bulk density 1.39g/cm3, the field capacity 193g/kg, pH 7.81, total nitrogen 1.1g/kg, available nitrogen 45mg/kg, available phosphorus 121mg/kg and available potassium 232mg/kg.
Effect on soil pH and the EC in experimental treatments Soil Depth cm CK 4.5t/hm2 7.5t/hm2 12t/hm2 pH EC us/cm pH EC us/cm pH EC us/cm pH EC us/cm 0-20 8.3 114.7 7.9 108.3 8.0 113.0 8.3 112.0 20-40 8.4 116.1 8.1 104.7 8.3 114.1 8.2 119.7 40-60 8.3 118.2 8.2 129.9 8.3 125.1 8.1 115.2 The Effect of SFO on Soil Ion Structure and Salinization Improvement The chemical ions of soil are the material basis for the plant growth, and also the environmental factor that affects plant growth.
Soil Chlorine Ion Concentration The chloride ion is an important factor of destroying the soil granular structure and inhibiting the plant photosynthesis, and its content affects the soil quality of green belts inevitably as well as the plant photosynthesis and plant growth.
The ion toxicity to plants is mainly affected by excess of Na + and Cl –[17].The excessive accumulation of Na+ and Cl- within the cytoplasm can interrupt the plant moisture and the steady state of ions, and affects ion absorption at the same time.
Online since: January 2012
Authors: Andreas Chrysanthou, Anatoli Babutsky, Leopold Kruszka, Chu En Tan
The calculations were carried out using the following mechanical and physical properties of the steel: density r = 7.6 Mg/m3, Young's modulus Е = 210 GPa, Poisson's ratio n = 0.3, coefficient of thermal expansion a = 1.25×10-5 /oС, electrical conductivity s = 5×106 S/m, thermal conductivity l = 45 W/(m.K) and specific heat c = 460 J/(kg.K).
All the properties in the calculations were assumed to be independent of temperature.
These zones are generated because of differences in the metal structure, surface roughness, existence of protective films and other factors.
The specifics of indentation hardness are based on the existence of its correlation with other mechanical properties like tensile strength.
Consequently, if a representative array of hardness measurements can be obtained, it is possible to assess the variation of the mechanical properties of the metal and its associated structural nonhomogeneity.
All the properties in the calculations were assumed to be independent of temperature.
These zones are generated because of differences in the metal structure, surface roughness, existence of protective films and other factors.
The specifics of indentation hardness are based on the existence of its correlation with other mechanical properties like tensile strength.
Consequently, if a representative array of hardness measurements can be obtained, it is possible to assess the variation of the mechanical properties of the metal and its associated structural nonhomogeneity.
Online since: January 2012
Authors: Hartmut Hoffmann, Martin Hirsch, Peter Demmel, Roland Golle
The blanking process is affected by tool parameters, the press and the material properties of the blanked part.
However, another important factor is the occurring temperature in the shearing zone of the sheet metal due to the dissipation of nearly 95% of the plastic work during blanking and, in addition, frictional heating.
An additional disadvantage is the mechanical weakening of the tool through holes near the cutting edge.
The principle of measurement where these impairments are eliminated is based on the different thermoelectric properties of the tool and the sheet material.
This shows that only small differences in chemical composition (compare Table 1) effect significant changes in the thermoelectric properties.
However, another important factor is the occurring temperature in the shearing zone of the sheet metal due to the dissipation of nearly 95% of the plastic work during blanking and, in addition, frictional heating.
An additional disadvantage is the mechanical weakening of the tool through holes near the cutting edge.
The principle of measurement where these impairments are eliminated is based on the different thermoelectric properties of the tool and the sheet material.
This shows that only small differences in chemical composition (compare Table 1) effect significant changes in the thermoelectric properties.