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Online since: October 2010
Authors: Gert Jan Swinkels, Piet Sonneveld
In practice, mechanical restrictions, plant conditions and costs will determine the implementation.
Therefore a large number of parameters (material properties, greenhouse dimensions) should be taken into account.
Because of mechanical restrictions, plant conditions and costs the number of parameters is restricted.
Compared to flat lamellae the performance slightly improves while reducing the PV-cell area significant, in this case with a factor 2.
In practice, mechanical restrictions, plant conditions and costs will determine the implementation.
Therefore a large number of parameters (material properties, greenhouse dimensions) should be taken into account.
Because of mechanical restrictions, plant conditions and costs the number of parameters is restricted.
Compared to flat lamellae the performance slightly improves while reducing the PV-cell area significant, in this case with a factor 2.
In practice, mechanical restrictions, plant conditions and costs will determine the implementation.
Online since: August 2012
Authors: Fa Feng Xia, Liang Miao, Chun Hua Ma
School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, P.R.
Microstructure of specimen film were observed by Tecnai-G2-20-S-Twin high respective transmission electron microscope, after being mechanical reducing and ion reducing on Gatan-600 double-ion reducing machine.
This is because when the ultrasonic wave was overpowered, the ultrasonic cavatitions affected the oriented deposition of AlN particles, caused the AlN content in the layer to decrease, and thus increase the abrasion.
The reason why the Ni grains fined during the deposition can be attributed to three factors: (1) The co-deposition of nano AlN particles in the layer provided a great deal of nucleating points for crystallization, and hindered the grow of the Ni grains. (2) Pulse current was applied in the experiments.
Ebrahimi F., The effect of deposition parameters on tensile properties of pulse-plated nanocrystalline nickel.
Microstructure of specimen film were observed by Tecnai-G2-20-S-Twin high respective transmission electron microscope, after being mechanical reducing and ion reducing on Gatan-600 double-ion reducing machine.
This is because when the ultrasonic wave was overpowered, the ultrasonic cavatitions affected the oriented deposition of AlN particles, caused the AlN content in the layer to decrease, and thus increase the abrasion.
The reason why the Ni grains fined during the deposition can be attributed to three factors: (1) The co-deposition of nano AlN particles in the layer provided a great deal of nucleating points for crystallization, and hindered the grow of the Ni grains. (2) Pulse current was applied in the experiments.
Ebrahimi F., The effect of deposition parameters on tensile properties of pulse-plated nanocrystalline nickel.
Online since: March 2010
Authors: Hui Hui Li, Yong Yang, Guang Yao Meng
Introduction
Ti6Al4V alloy has been regarded as crucial material of modern aerospace industry because of its
excellent mechanical properties [1].
However, the main factors that causes monolithic component distortion is redistribution of residual stress during material removal and low rigidity of workpiece.
The Johnson-Cook material law coefficients in Eq.1 are identified from high strain rate mechanical experiment using the SHPB method.
Because the acting spot of cutting loads is local and the affected region is very small, based on theory of SWINAN, it is equivalent that the loads on arc li are applied on arc li1 and li2 .
Sun: Chinese Journal of mechanical engineering Vol. 68-71 (2005), p. 117-122 (In Chinese) [5] Z.J.
However, the main factors that causes monolithic component distortion is redistribution of residual stress during material removal and low rigidity of workpiece.
The Johnson-Cook material law coefficients in Eq.1 are identified from high strain rate mechanical experiment using the SHPB method.
Because the acting spot of cutting loads is local and the affected region is very small, based on theory of SWINAN, it is equivalent that the loads on arc li are applied on arc li1 and li2 .
Sun: Chinese Journal of mechanical engineering Vol. 68-71 (2005), p. 117-122 (In Chinese) [5] Z.J.
Online since: April 2013
Authors: Jin Shin Ho, Ching Bin Lin, Zue Chin Chang, C.F. Hsiao
Hsiao1
1Department of Mechanical and Electro-Mechanical Engineering Tamkang University Tamsui, New Taipei City, Taiwan, Republic of China
2Department of Mechanical Engineering National Chin-Yi University of Technology Taiping City, Taichung County, Taiwan, Republic of China
acblin@mail.tku.edu.tw
Keywords: hot embossing; poly (methyl methacrylate); average molecular weight; number average molecular weight
Abstract.
The embossing temperature, pressure, time, and procedure factors governing hot-embossing were also reported [7].
Table 1 The Average molecular weight and molecular numerical of PMMA micro-pattern as a function of the base width Conclusion The flow behavior of the softened PMMA into micro-cavity during hot-embossing is that the size of the micro-cavity will affect the average molecular weight and number average molecular weight.
Mechanical Industry Research Laboratories.
Properties of polymers, 3rd ed.
The embossing temperature, pressure, time, and procedure factors governing hot-embossing were also reported [7].
Table 1 The Average molecular weight and molecular numerical of PMMA micro-pattern as a function of the base width Conclusion The flow behavior of the softened PMMA into micro-cavity during hot-embossing is that the size of the micro-cavity will affect the average molecular weight and number average molecular weight.
Mechanical Industry Research Laboratories.
Properties of polymers, 3rd ed.
Online since: December 2012
Authors: Marcel Behún, Anton Panda, Jozef Jurko
Fixture for the cutting tool: high precision hydraulic clamping head, the workpiece fixture: mechanical vise.
Due to deformation and heat, which is always part of the cutting process, stress is generated on this layer and changes its physical and mechanical properties.
The set of properties that define the state of the surface after cutting is referred to as technological inheritance, which makes up the future operating features, i.e. forms the surface functionality [7].
The surface after the cut is the part of the object's surface created by the cutting process and is the carried and creator of the functional properties of the surface, figure 2.
The wear and deviation of the spindle can affect the accuracy of production, · the proper production and removal of chips must always be ensured.
Due to deformation and heat, which is always part of the cutting process, stress is generated on this layer and changes its physical and mechanical properties.
The set of properties that define the state of the surface after cutting is referred to as technological inheritance, which makes up the future operating features, i.e. forms the surface functionality [7].
The surface after the cut is the part of the object's surface created by the cutting process and is the carried and creator of the functional properties of the surface, figure 2.
The wear and deviation of the spindle can affect the accuracy of production, · the proper production and removal of chips must always be ensured.
Online since: March 2024
Authors: Monowar Hussain, Rezaul Islam Choudhury
It is crucial to note that organic soil is not suitable for construction purposes due to its hazardous properties.
In the field of geopolymers, various factors such as the aluminosilicate source, the activating solution, and the curing environment, play pivotal roles in shaping the material's characteristics[11].
Among these factors, the Si/Al molar ratio of the aluminosilicate source stands out as a critical determinant, significantly influencing the mechanical strength and microstructure of geopolymers.
The physiochemical properties of organic soil are given in Table 1.ss Table 1.
Physiochemical properties of Organic soil.
In the field of geopolymers, various factors such as the aluminosilicate source, the activating solution, and the curing environment, play pivotal roles in shaping the material's characteristics[11].
Among these factors, the Si/Al molar ratio of the aluminosilicate source stands out as a critical determinant, significantly influencing the mechanical strength and microstructure of geopolymers.
The physiochemical properties of organic soil are given in Table 1.ss Table 1.
Physiochemical properties of Organic soil.
Online since: June 2009
Authors: Rosario Ceravolo, Alessandro de Stefano, Gianluca Ruocci
The resulting effect on the structure is the
development of cracking mechanisms on the arches which may affect the dynamic behaviour of the
whole bridge.
Low compressive strength elements were chosen and a mortar with poor mechanical properties was used to bound them in order to reproduce the same materials of historical constructions.
The materials properties were assigned according to the results of the characterization tests carried out on some masonry samples prepared during the arch bridge model construction.
The results coming from the numerical simulations are affected by uncertainty factors, including: irregularities in the internal masonry texture, lack of material and empty volumes, difficult to detect, are often sources of uncertain mechanical properties.
Results about damping ratio confirm that a reliable estimate of dissipative properties requires the knowledge of excitation, at least in the range of usual experimental modal analysis techniques.
Low compressive strength elements were chosen and a mortar with poor mechanical properties was used to bound them in order to reproduce the same materials of historical constructions.
The materials properties were assigned according to the results of the characterization tests carried out on some masonry samples prepared during the arch bridge model construction.
The results coming from the numerical simulations are affected by uncertainty factors, including: irregularities in the internal masonry texture, lack of material and empty volumes, difficult to detect, are often sources of uncertain mechanical properties.
Results about damping ratio confirm that a reliable estimate of dissipative properties requires the knowledge of excitation, at least in the range of usual experimental modal analysis techniques.
Online since: October 2014
Authors: Klaas van Breugel, Nguyen van Tuan
These requirements may involve long-term mechanical properties, early-age strength, toughness, volume stability and long-life in severe conditions.
Experimental studies on autogenous shrinkage have revealed that both the type of cement and w/c are influencing factors [31].
The evolution of the resistance against deformation, i.e. of the mechanical properties, is different for different types of cement and different mix compositions.
Not only the chemical composition, but also the fineness of the cement and the curing temperature determine how the microstructure of the system and the associated mechanical properties develop with progress of the hydration process.
Bentz: Influence of Shrinkage-Reducing Admixtures on Early-Age Properties of Cement Pastes.
Experimental studies on autogenous shrinkage have revealed that both the type of cement and w/c are influencing factors [31].
The evolution of the resistance against deformation, i.e. of the mechanical properties, is different for different types of cement and different mix compositions.
Not only the chemical composition, but also the fineness of the cement and the curing temperature determine how the microstructure of the system and the associated mechanical properties develop with progress of the hydration process.
Bentz: Influence of Shrinkage-Reducing Admixtures on Early-Age Properties of Cement Pastes.
Online since: March 2022
Authors: Karek Rabie, Zine Abdallah, Khalfi Mehdi, Mostafa Mostafa
Thermoplastic starch absorbs water easily and has relatively fewer thermal and mechanical properties compared to synthetic polymers [10].
Where this variation in the values can be related mainly to the factors that changed during the test or the presence of defects in the characteristics of the plant.
The mechanical properties of the bio-composites are generally improved after the fibers are added.
Kalantari, Preparation of biodegradable composite starch/tragacanth gum/nanoclay film and study of its physicochemical and mechanical properties, Chemical Review and Letters, 3 (2020) 98-103
Debeaufort, How glycerol and water contents affect the structural and functional properties of starch-based edible films, Polymers, 10 (2018) 412
Where this variation in the values can be related mainly to the factors that changed during the test or the presence of defects in the characteristics of the plant.
The mechanical properties of the bio-composites are generally improved after the fibers are added.
Kalantari, Preparation of biodegradable composite starch/tragacanth gum/nanoclay film and study of its physicochemical and mechanical properties, Chemical Review and Letters, 3 (2020) 98-103
Debeaufort, How glycerol and water contents affect the structural and functional properties of starch-based edible films, Polymers, 10 (2018) 412
Online since: May 2014
Authors: Hong Hao, Jun Li
The parameters that affect the concrete spall damage are investigated.
Since spall damage, although usually occurs only in a local area close to the explosion, also depends on the structural properties such as flexural toughness, the results of RC slab spall damage might not be applicable to predict RC column spall damage.
The strain rate can be approximately calculated as =220/s; then the dynamic increase factor for concrete tensile strength can be obtained from the strain rate curve [5] , and in this case Dynamic Increase Factor (DIF)=7.
Other column configurations and material properties are hold the same as given in last section.
Dynamic increase factors for concrete.
Since spall damage, although usually occurs only in a local area close to the explosion, also depends on the structural properties such as flexural toughness, the results of RC slab spall damage might not be applicable to predict RC column spall damage.
The strain rate can be approximately calculated as =220/s; then the dynamic increase factor for concrete tensile strength can be obtained from the strain rate curve [5] , and in this case Dynamic Increase Factor (DIF)=7.
Other column configurations and material properties are hold the same as given in last section.
Dynamic increase factors for concrete.