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Online since: October 2011
Authors: Xiang Ji, Guang Ying Ran
Therefore improving the operation ability of operational personnel in substation is the influence of the factors which influent the safe and reliable operation of power system.
In the transformer substation simulation based on component software development technology, all sorts of second equipment in accordance with their respective physical properties of the generation of their virtual equipment respectively, and by using the component technology, created virtual equipment will be packed into equipment simulation component to make software has good open and easy extensibility.
It introduced appraisal factor and geographical factor to describe the circumstances, the two factors is estimated function F (N) of parameters.
G(i):The geographical factors, used to reflect far and near of the geographical location.
So through the F(N) calculation, got an optimal path reasoning, it carries the constraints of the comprehensive consideration of the rules, appraisal factor and geographical factors, is a kind of very effective optimal ask award algorithm.
In the transformer substation simulation based on component software development technology, all sorts of second equipment in accordance with their respective physical properties of the generation of their virtual equipment respectively, and by using the component technology, created virtual equipment will be packed into equipment simulation component to make software has good open and easy extensibility.
It introduced appraisal factor and geographical factor to describe the circumstances, the two factors is estimated function F (N) of parameters.
G(i):The geographical factors, used to reflect far and near of the geographical location.
So through the F(N) calculation, got an optimal path reasoning, it carries the constraints of the comprehensive consideration of the rules, appraisal factor and geographical factors, is a kind of very effective optimal ask award algorithm.
Online since: March 2007
Authors: Kotaro Kuroda, Masazumi Okido, Ryoichi Ichino
The
properties for the coated samples were studied using XRD, EDX, FT-IR, and SEM.
Introduction Calcium phosphates, specifically HAp (Ca10(PO4)6(OH)2), are of interest in bone-interfacing implant applications because of their demonstrated osteoconductive properties[1].
Hydroxyapatite is considered to be a bioactive material, and is used in the fabrication of medical and dental implants, usually in the form of a coating on a metallic substrate to compensate for its poor intrinsic mechanical properties.
The properties of the coated samples were studied using X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM).
The surface morphology is considered to be one of the most important factors in the behavior of cells.
Introduction Calcium phosphates, specifically HAp (Ca10(PO4)6(OH)2), are of interest in bone-interfacing implant applications because of their demonstrated osteoconductive properties[1].
Hydroxyapatite is considered to be a bioactive material, and is used in the fabrication of medical and dental implants, usually in the form of a coating on a metallic substrate to compensate for its poor intrinsic mechanical properties.
The properties of the coated samples were studied using X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM).
The surface morphology is considered to be one of the most important factors in the behavior of cells.
Online since: October 2014
Authors: Aristotel Popescu, Ovidiu Virgil Stadoleanu, Ana Georgiana Lupu, David Pfund, Abel Hernandez-Guerrero, Ema Carmen Panaite
Improved Heat Transfer using Micro-structures in Trifold Solar Energy Conversion Systems
POPESCU Aristotel1,a*, PFUND David2,b, HERNANDEZ-GUERRERO Abel3,c, PANAITE Ema-Carmen1,d, LUPU Ana Georgiana1,e and STADOLEANU Ovidiu-Virgil1,f
1”Gheorghe Asachi” Technical University of Iaşi, Faculty of Mechanical Engineering, Bd.
Introduction The ever-rising global trend of renewable energy options usage was affected by the recent economic crisis, but remained on an increasing curve, mainly due to developments and investments on Asian markets [1].
The combination of these two factors alone, would provide enough incentives to apply micro-scale heat exchanger technology to hybrid trifold solar panels.
The conditions assumed for analysis of both channel configurations were: steady state, negligible radiation heat transfer and constant properties.
For smaller size channels, the minor increase relative to theoretical values may be due to the more realistic situation where fluid properties are temperature dependent.
Introduction The ever-rising global trend of renewable energy options usage was affected by the recent economic crisis, but remained on an increasing curve, mainly due to developments and investments on Asian markets [1].
The combination of these two factors alone, would provide enough incentives to apply micro-scale heat exchanger technology to hybrid trifold solar panels.
The conditions assumed for analysis of both channel configurations were: steady state, negligible radiation heat transfer and constant properties.
For smaller size channels, the minor increase relative to theoretical values may be due to the more realistic situation where fluid properties are temperature dependent.
Online since: April 2012
Authors: Jian Min Zeng, Zhi Liu Hu, Chen Liu
Introduction
Impurities such as non metallic inclusions and hydrogen in the aluminum adversely affect the mechanical, physical and chemical properties of aluminum castings, such as the strengths, electrical and thermal conductivities and corrosion resistance, and so on.
It is dispersedly distributed in the melt and usually of small size (from less than 1 to hundreds of micron and of flocculent structures), which is extremely harmful to the properties of the materials, especially elongation and fatigue performance.
A, Chemical and kinetic factors related to hydrogen removal from aluminum, Metall.
It is dispersedly distributed in the melt and usually of small size (from less than 1 to hundreds of micron and of flocculent structures), which is extremely harmful to the properties of the materials, especially elongation and fatigue performance.
A, Chemical and kinetic factors related to hydrogen removal from aluminum, Metall.
Online since: October 2014
Authors: Jian Can Hu, Li Ming Zhang, Min Xiao
Because of their high water content and excellent hydrophilic properties, hydrogels have been widely utilized in tissue engineering, pharmaceuticals, food, personal care products and drug delivery [2].
In this study, cellulose was added to reinforce the hydrogel structure on the grounds that the chains of cellulose are very stiff and act as a backbone to improve the mechanical strength of the hydrogel.
Figure 4 Swelling ratios of the hydrogels in 9g/L NaCl solution The swelling behavior of cellulose-CMC hydrogels in physical saline water is one of the important factors that will affect the application of hydrogels as biomaterials.
Characterization and properties of carboxymethyl cellulose hydrogels crosslinked by polyethylene glycol.
In this study, cellulose was added to reinforce the hydrogel structure on the grounds that the chains of cellulose are very stiff and act as a backbone to improve the mechanical strength of the hydrogel.
Figure 4 Swelling ratios of the hydrogels in 9g/L NaCl solution The swelling behavior of cellulose-CMC hydrogels in physical saline water is one of the important factors that will affect the application of hydrogels as biomaterials.
Characterization and properties of carboxymethyl cellulose hydrogels crosslinked by polyethylene glycol.
Online since: April 2005
Authors: Michael B. Korzenski, D.D. Bernhard, T.H. Baum, Hitoshi Kuniyasu, Takeshi Hattori, Koichiro Saga
This phenomenon, called stiction, is a common problem in the
manufacturing of micro electro mechanical systems (MEMS) devices.
In addition, conventional aqueous chemistries tend to alter the sensitive low-k interlayer dielectric properties during post-etch or post-ash photoresist residue removal because these materials are organic or porous polymer materials.
It should be noted that the important factor to consider is the etch rate rather than the amount of substrate to etch to obtain these same PRE values.
This may be a result of three factors, specifically, chemical identity, solution density, chemical additive solubility, and Si and SiO2 etch rates.
Our experiments demonstrate that optimum chemicals, their molar ratios, and specific process conditions can profoundly affect the PRE.
In addition, conventional aqueous chemistries tend to alter the sensitive low-k interlayer dielectric properties during post-etch or post-ash photoresist residue removal because these materials are organic or porous polymer materials.
It should be noted that the important factor to consider is the etch rate rather than the amount of substrate to etch to obtain these same PRE values.
This may be a result of three factors, specifically, chemical identity, solution density, chemical additive solubility, and Si and SiO2 etch rates.
Our experiments demonstrate that optimum chemicals, their molar ratios, and specific process conditions can profoundly affect the PRE.
Online since: February 2014
Authors: Xiu Jian Zhao, Bin Bin Li, Min Dong Zheng, Ting Peng, Jia Miao Ni
Then the density of target material is one of the most important factors [15].
To improve the optical and electrical properties of the sputtering film, target usually requires a high density.
The density of target not only affected the sputtering rate, but also affected the electrical properties of the film.
Zhao, Structural, Electrical and Optical Properties of p-Type Transparent Conducting SnO2:Zn Film .
[19] Dawar AL, Joshi JC, Review Semiconducting Transparent Thin Films: Their Properties and Applications.
To improve the optical and electrical properties of the sputtering film, target usually requires a high density.
The density of target not only affected the sputtering rate, but also affected the electrical properties of the film.
Zhao, Structural, Electrical and Optical Properties of p-Type Transparent Conducting SnO2:Zn Film .
[19] Dawar AL, Joshi JC, Review Semiconducting Transparent Thin Films: Their Properties and Applications.
Online since: August 2012
Authors: Xue Ying Wang, Dong Xu, Ya Jun Wu
The straw bale is a new type of envelope structural material; it is that straws (wheat straw) are tied with wire or nylon rope by mechanical stress in straw bale machine.
Then, the block waterproofing and thermal insulation properties have been significantly improved.
Plant fiber cement composite panels are also based on the building boards in rural areas, with excellent thermal insulation properties, and it can be widely used in rural residential constructions. 4.
The outside window should be inward-opening casement window in order to improve air tightness and thermal insulation properties, while improving the sound insulation and slip-off effect.
An important factor affecting the length of the process is the weak economy and low awareness of farmers and managers.
Then, the block waterproofing and thermal insulation properties have been significantly improved.
Plant fiber cement composite panels are also based on the building boards in rural areas, with excellent thermal insulation properties, and it can be widely used in rural residential constructions. 4.
The outside window should be inward-opening casement window in order to improve air tightness and thermal insulation properties, while improving the sound insulation and slip-off effect.
An important factor affecting the length of the process is the weak economy and low awareness of farmers and managers.
Online since: January 2022
Authors: Duong Thanh Qui, Alexandr Sergeevich Inozemtcev, Evgenij Korolev
Analyzing the influence of SAP on the mechanical properties of concrete at the age of 28 days was concluded that there is an unambiguously negative effect: the reduction in compressive strength by 8...35 % when hardening in condition with high humidity and up to 28 % under low humidity condition [13...15].
It will contribute to the reduction of shrinkage deformations and obtaining a composite with high-performance properties.
Materials and Methods In this paper, the influence of SAP solution on the processes of structure formation and properties of cement compositions is investigated.
Rheological properties of mixtures and mechanical properties of cement stone with SAP solution No Amount of acrylate part in SAP solution, W/ΣA Content of SAP solution in cement paste, ΣA/C, % Spread diameter, Dsp, mm Flexural strength, Rfl, MPa Compressive strength, Rcom, MPa 1. 0 0.00 192.8 7.18 70.4 2. 95 0.25 197.8 6.94 68.5 3. 47 0.50 201.5 6.85 70.7 4. 23 1.00 197.8 6.91 69.7 5. 18 1.25 198.0 7.00 71.7 6. 15 1.50 206.5 6.91 70.1 7. 11 2.00 199.5 8.70 70.8 Experimental statistical models were additionally obtained from the experimental data.
Duong, Physical and mechanical properties of cement stone with superabsorbent polyacrylate solutions, Magazine of Civil Engineering. 89 (2019) 179-186
It will contribute to the reduction of shrinkage deformations and obtaining a composite with high-performance properties.
Materials and Methods In this paper, the influence of SAP solution on the processes of structure formation and properties of cement compositions is investigated.
Rheological properties of mixtures and mechanical properties of cement stone with SAP solution No Amount of acrylate part in SAP solution, W/ΣA Content of SAP solution in cement paste, ΣA/C, % Spread diameter, Dsp, mm Flexural strength, Rfl, MPa Compressive strength, Rcom, MPa 1. 0 0.00 192.8 7.18 70.4 2. 95 0.25 197.8 6.94 68.5 3. 47 0.50 201.5 6.85 70.7 4. 23 1.00 197.8 6.91 69.7 5. 18 1.25 198.0 7.00 71.7 6. 15 1.50 206.5 6.91 70.1 7. 11 2.00 199.5 8.70 70.8 Experimental statistical models were additionally obtained from the experimental data.
Duong, Physical and mechanical properties of cement stone with superabsorbent polyacrylate solutions, Magazine of Civil Engineering. 89 (2019) 179-186
Online since: August 2014
Authors: Andrii G. Kostryzhev, Kiet Tieu, Turbadrakh Chuluunbat, Cheng Lu
The Acoustic Emission (AE) monitoring technique is widely used in mechanical and material research for detection of plastic deformation, fracture initiation and crack growth.
It is shown that the strain rate and the presence of a crack (modeled by a notch on the sample), affect the fracture mode (brittle or ductile) and a relative amount of the mode dependent AE signatures.
Some authors studied the relationship between AE features (such as signal amplitude, frequency, energy and duration) and mechanical parameters (load, stress and crack growth) during tensile deformation of notched or plain specimens [8-11].
AE sources Factors AE waveform parameters Ref Amplitude Frequency Duration Rise time Count Waveform Fracture modes Ductile fracture Low Low Long Low Low Continuous signal [3] Brittle fracture High High Short High High Burst signal Material behavior Plastic deformation Low low long Low - Continuous signal [8] Crack initiation and propagation High High Short High - Burst signal [3] [10] Crack type Tensile mode-I High High Short high Longitudinal [1] Shear mode-II Low low long low Shear wave Strain rate effect High Strain rate High - - - - - [8] [11] Low strain rate Low - - - - - Experimental procedure Fig. 1 The geometry of single edge notched specimen Tensile testing.
The GTN constitutive model can describe the influence of voids on the plasticity properties of a metal and can be incorporated in the finite element analysis to simulate the tensile behavior of an aluminum alloy specimen [14].
It is shown that the strain rate and the presence of a crack (modeled by a notch on the sample), affect the fracture mode (brittle or ductile) and a relative amount of the mode dependent AE signatures.
Some authors studied the relationship between AE features (such as signal amplitude, frequency, energy and duration) and mechanical parameters (load, stress and crack growth) during tensile deformation of notched or plain specimens [8-11].
AE sources Factors AE waveform parameters Ref Amplitude Frequency Duration Rise time Count Waveform Fracture modes Ductile fracture Low Low Long Low Low Continuous signal [3] Brittle fracture High High Short High High Burst signal Material behavior Plastic deformation Low low long Low - Continuous signal [8] Crack initiation and propagation High High Short High - Burst signal [3] [10] Crack type Tensile mode-I High High Short high Longitudinal [1] Shear mode-II Low low long low Shear wave Strain rate effect High Strain rate High - - - - - [8] [11] Low strain rate Low - - - - - Experimental procedure Fig. 1 The geometry of single edge notched specimen Tensile testing.
The GTN constitutive model can describe the influence of voids on the plasticity properties of a metal and can be incorporated in the finite element analysis to simulate the tensile behavior of an aluminum alloy specimen [14].