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Online since: March 2018
Authors: Majid Ali, Muhammad Usman Farooqi
To study the influence of wheat straw for having concrete with improved properties, Plain Concrete (PC) properties are taken as reference.
These factors lead to the development of fiber reinforced concrete.
Tensile strength of concrete affected by uniformly dispersed and closely spaced short lengths of wire reinforcement.
Mechanical and dynamic properties of coconut fibre reinforced concrete.
Study on durability of natural fibre concrete composites using mechanical strength and microstructural properties.
These factors lead to the development of fiber reinforced concrete.
Tensile strength of concrete affected by uniformly dispersed and closely spaced short lengths of wire reinforcement.
Mechanical and dynamic properties of coconut fibre reinforced concrete.
Study on durability of natural fibre concrete composites using mechanical strength and microstructural properties.
Online since: August 2021
Authors: Tsepo S. Mputsoe, Noor A. Ahmed, Oyetola Ogunkunle
The properties of extracted oil, such as saponification value and acid value, were determined to ascertain its suitability for biodiesel production.
The data entry is shown in Table 1. 2.3 Transesterification of Melia azedarach oil The transesterification of Melia azedarach was done while varying the following important factors which affect the reaction.
The predictive models for FFA conversion, given in term of coded factors of the applied factors, are presented in Equations 6, 7, 8, and 9.
The seeds of Melia azedarach, which have been established as an environmental problem, has been found to have favourable oil properties for biodiesel production.
With the favourable properties of the oil extract, it can be used as a supplementary feedstock for other inedible sources of biodiesel such as waste cooking oil.
The data entry is shown in Table 1. 2.3 Transesterification of Melia azedarach oil The transesterification of Melia azedarach was done while varying the following important factors which affect the reaction.
The predictive models for FFA conversion, given in term of coded factors of the applied factors, are presented in Equations 6, 7, 8, and 9.
The seeds of Melia azedarach, which have been established as an environmental problem, has been found to have favourable oil properties for biodiesel production.
With the favourable properties of the oil extract, it can be used as a supplementary feedstock for other inedible sources of biodiesel such as waste cooking oil.
Online since: June 2012
Authors: Su Feng Yin, Feng Ruan, Jian Yu Wang
Theory Study and Numerical Analysis of Ultra-thin Wall Injection Molding
Sufeng Yin 1,2,a, Feng Ruan 1, Jianyu Wang 3 ,
1School of Mechanical & Automotive Engineering.
Using the method of numerical simulation and experience, the article verifies the consistency of experience result and the change of the factors, such as using ultra-thin viscosity model, wall-slip and the change of heat transfer coefficient while doing the simulation.
Base on the experience of producing ultra-thin Light guide plate, the thesis focuses on studying the main influence factors which differ from macro melt flowing and are caused during the injection molding.
In order to obtain ht expression, divide the heat transfer coefficient into two parts: one does not affected by temperature f(v,l), h(θ) and one does
A number of micro factors on the impact of filling are worthy of further study, especially the changeable function of micro-factors.
Using the method of numerical simulation and experience, the article verifies the consistency of experience result and the change of the factors, such as using ultra-thin viscosity model, wall-slip and the change of heat transfer coefficient while doing the simulation.
Base on the experience of producing ultra-thin Light guide plate, the thesis focuses on studying the main influence factors which differ from macro melt flowing and are caused during the injection molding.
In order to obtain ht expression, divide the heat transfer coefficient into two parts: one does not affected by temperature f(v,l), h(θ) and one does
A number of micro factors on the impact of filling are worthy of further study, especially the changeable function of micro-factors.
Online since: March 2016
Authors: Yi Long Liang, Li Qiong Zhong, Zhen Yan
The HCF properties are shown in Table 2.
Due to HCF test results was influenced by many factors, so the number of cycles were different when stress ratio, surface state and value of stress intensity were same.
In addition, it will also be affected by multi-directional stress, which is also the reason for the embrittlement.
Hence, we know that TC11 alloy WSP sample is also affected by the multi-directional stress during the cyclic loading.
[15] Wang Jihui,Zheng Junping,Liu Jiachen,Huang Dinghai, Mechanical Behavior of Materials, Tian Jing:Tian Jing University Press. 83(2006)
Due to HCF test results was influenced by many factors, so the number of cycles were different when stress ratio, surface state and value of stress intensity were same.
In addition, it will also be affected by multi-directional stress, which is also the reason for the embrittlement.
Hence, we know that TC11 alloy WSP sample is also affected by the multi-directional stress during the cyclic loading.
[15] Wang Jihui,Zheng Junping,Liu Jiachen,Huang Dinghai, Mechanical Behavior of Materials, Tian Jing:Tian Jing University Press. 83(2006)
Online since: June 2014
Authors: Wayan Nata Septiadi, Nandy Putra, Ranggi Sahmura
While nanofluid with its higher thermal conductivity and some other upgraded properties compared to conventional fluid rose as appealing research subject especially on fluid and thermal research area.
In order to develop a performer heat pipe, researchers have been investigating the effect of deciding factors like wick, working fluid, and material as well as geometry.
Figure 2 (a) The heat pipe used in this study (b) Experimental setup of this study Result and Discussion The Assessment of CuO-Water Nanofluid The measurement of nanofluid thermal conductivity was done using KD2 Pro Thermal Properties Analyzer Decagon and compared with other studies [11].
The Brownian effect as well as the layer of liquid-solid interface of nano-particle and a more even molecular structure at the interface of solid nano-particle also have role in enhancing the thermal properties of the fluid [12].
The increment of nanofluid’s thermal conductivity being used affects the overall effective thermal conductivity of the heat pipe.
In order to develop a performer heat pipe, researchers have been investigating the effect of deciding factors like wick, working fluid, and material as well as geometry.
Figure 2 (a) The heat pipe used in this study (b) Experimental setup of this study Result and Discussion The Assessment of CuO-Water Nanofluid The measurement of nanofluid thermal conductivity was done using KD2 Pro Thermal Properties Analyzer Decagon and compared with other studies [11].
The Brownian effect as well as the layer of liquid-solid interface of nano-particle and a more even molecular structure at the interface of solid nano-particle also have role in enhancing the thermal properties of the fluid [12].
The increment of nanofluid’s thermal conductivity being used affects the overall effective thermal conductivity of the heat pipe.
Online since: December 2003
Authors: A.M. Monti, M. De Koning, S. Ramos de Debiaggi
Introduction
There is a general interest in the influence of native point defects on the physical and mechanical
properties of technological materials.
Point defects play a central role in the mechanisms of mass transport in crystalline materials through diffusion, affecting, for instance, order-disorder phenomena in compounds, mechanical hardening through interactions with dislocations and grain boundaries, and electronic properties in semiconductor materials.
Accordingly, in order to understand and/or control the physical and mechanical properties of such materials it is important to gather knowledge on the structure and thermodynamic properties of point defects in crystalline solids.
An interesting case in this context involves the thermal and kinetic properties of point defects in fcc metals.
The calculated vacancy migration energy is in very good agreement with the measured value as well as the thermal and melting properties.
Point defects play a central role in the mechanisms of mass transport in crystalline materials through diffusion, affecting, for instance, order-disorder phenomena in compounds, mechanical hardening through interactions with dislocations and grain boundaries, and electronic properties in semiconductor materials.
Accordingly, in order to understand and/or control the physical and mechanical properties of such materials it is important to gather knowledge on the structure and thermodynamic properties of point defects in crystalline solids.
An interesting case in this context involves the thermal and kinetic properties of point defects in fcc metals.
The calculated vacancy migration energy is in very good agreement with the measured value as well as the thermal and melting properties.
Online since: August 2013
Authors: Zhao Wen Tang, Lang Gao, Quan Zhong Liu
Soil nailing is a practical and proven technique used in retaining excavations and stabilizing slopes by reinforcing the ground in situ with relatively small, closely spaced, fully bonded inclusions, usually steel bars, which can improve native soil’s mechanical characteristics and create a uniform composite mass where soil are locked together.
Several factors have contributed to the popularity of soil nailing.
However, It is very complicated to predict the horizontal displacement because it is affected by many factors and the relationships among the horizontal displacement and these factors are highly nonlinear.
Fig. 1 BP Network architecture As mentioned above, the horizontal displacement of soil nailing is influenced by many factors such as soil properties, depth of excavation, nail spacing, nail length, and so on, which can be analyzed by using finite element method.
However, these factors will not be concerned in this paper.
Several factors have contributed to the popularity of soil nailing.
However, It is very complicated to predict the horizontal displacement because it is affected by many factors and the relationships among the horizontal displacement and these factors are highly nonlinear.
Fig. 1 BP Network architecture As mentioned above, the horizontal displacement of soil nailing is influenced by many factors such as soil properties, depth of excavation, nail spacing, nail length, and so on, which can be analyzed by using finite element method.
However, these factors will not be concerned in this paper.
Online since: August 2014
Authors: Guang Lin Wang, Xu Dong Pan, Xin Xin Cheng
Linear motor can be said to be the heart of the servo valve,the quality of servo valve is directly affected by its quality.
The accuracy of test results were decreased due to some reasons, such as power supply voltage fluctuations, frequency hopping, load fluctuations and other factors can make the instrument pointer swing.
The test system was designed in this paper was used to test the permanent magnet dc motor, motor output properties, such as linear displacement, thrust and speed etc, input features such as voltage, current etc, process characteristics such as temperature, the thrust fluctuation, control precision are included.
Design of the Mechanical Structure The Whole Sssembly Drawing.
The whole assembly drawing of the mechanical structure is designed as shown in Fig.6.
The accuracy of test results were decreased due to some reasons, such as power supply voltage fluctuations, frequency hopping, load fluctuations and other factors can make the instrument pointer swing.
The test system was designed in this paper was used to test the permanent magnet dc motor, motor output properties, such as linear displacement, thrust and speed etc, input features such as voltage, current etc, process characteristics such as temperature, the thrust fluctuation, control precision are included.
Design of the Mechanical Structure The Whole Sssembly Drawing.
The whole assembly drawing of the mechanical structure is designed as shown in Fig.6.
Online since: November 2011
Authors: Qing Qing Qi, Ze Zhong Zhang, Jian Xin Xu, Yan Bin Li, Qiang Huang
Aiming at the new problem of water resources—pollution and shortage, Jiang Wenlai[13,14]first proposed a new definition of water resources, discussed spatial and temporal changes of water resources price, researched the time flow, space flow, space-time flow of water resources value, analyzed various factors affecting water resources value, raised the fuzzy mathematical model of water resources value and the calculation method of water resources price, and he also discussed the change of water resources value when its factors abnormally changed, analyzed not only the plus value and negative value of water resources because of different quantity and quality of water and interests discrepancy, but also the coupling value which was the result of the interaction, mutual influence and mutual coupling of the two value.
Property right is the basis of economic operation.
Property right transfer is the core of goods and services transaction, and water resources and property right are closely related.
In many mechanical problems, we need to discuss some changes of mobiles during some time rather than their movements at each moment, and then we will use the accumulation of force during this period, that is impulse.
The Water resource which has resource scarcity is limited relative to human sustainable development, and regulated reservoir can change the different space-time scarcity of water resources, thereby affecting the water scarcity value.
Property right is the basis of economic operation.
Property right transfer is the core of goods and services transaction, and water resources and property right are closely related.
In many mechanical problems, we need to discuss some changes of mobiles during some time rather than their movements at each moment, and then we will use the accumulation of force during this period, that is impulse.
The Water resource which has resource scarcity is limited relative to human sustainable development, and regulated reservoir can change the different space-time scarcity of water resources, thereby affecting the water scarcity value.
Online since: October 2010
Authors: Dan Dan Liu, Chun Rui Tang
Compared with traditional mechanical valves, the magneto-rheological control valve
has some benefits such as simple structure, small bulk, easy to control, fast answer speed, low work
noise, resistance abrasion, high reliability and low cost.
Too small particulate diameter is result to low MR fluid saturation magnetic induction intensity, which will affect whole performance of MR fluid.
After magnetic fields affect, icon particles are magnetized and array along magnetic fields direction.
This intelligent material flows fluently when there is no magnetic field, at this time, the valve opens; however, when the current is applied, it brings strong magnetic field, apparent viscosity of the MR fluid increases in a flash (Milliseconds), MR fluid takes on solid property.
Mathematical Model Pressure drop of MR fluid passing through the ring damping gap of MR valve is [10]: dLc Rd QL P aya τ π η +=∆ 3 1 6 (1) In formula, η-viscosity of null field; Q -inlet volume flow; aL -length of ring damping gap; d -thickness of damping gap; n Y aB=τ -yield stress of MR fluid under magnetic field; R -disk radius; c -correction factor, ranging from 2 to 3.
Too small particulate diameter is result to low MR fluid saturation magnetic induction intensity, which will affect whole performance of MR fluid.
After magnetic fields affect, icon particles are magnetized and array along magnetic fields direction.
This intelligent material flows fluently when there is no magnetic field, at this time, the valve opens; however, when the current is applied, it brings strong magnetic field, apparent viscosity of the MR fluid increases in a flash (Milliseconds), MR fluid takes on solid property.
Mathematical Model Pressure drop of MR fluid passing through the ring damping gap of MR valve is [10]: dLc Rd QL P aya τ π η +=∆ 3 1 6 (1) In formula, η-viscosity of null field; Q -inlet volume flow; aL -length of ring damping gap; d -thickness of damping gap; n Y aB=τ -yield stress of MR fluid under magnetic field; R -disk radius; c -correction factor, ranging from 2 to 3.