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Online since: November 2006
Authors: José Carlos Bressiani, Ana Helena A. Bressiani, Christiane Ribeiro
The interaction albumin/surfactant with
detergency properties was evaluated by pH and viscosity measurements.
The foam was produced by mechanical stirring.
Scaffolds utilized for simultaneous tissue support and delivery of specific factors must exhibit an appropriate pore structure, release kinetics, and suitable resorption rates [3].
Considering that different synergy can affect the foam volume, the use of additives, such as albumin, in the presence of a surfactant with detergency property, improves the foam action due to the albumin adsorption in the films surface which stabilizes the foam [6, 7].
The use of 0.3 wt.% dispersant optimized the suspensions with 68 wt. % solids percentage, resulting in adjusted properties in the foam production
The foam was produced by mechanical stirring.
Scaffolds utilized for simultaneous tissue support and delivery of specific factors must exhibit an appropriate pore structure, release kinetics, and suitable resorption rates [3].
Considering that different synergy can affect the foam volume, the use of additives, such as albumin, in the presence of a surfactant with detergency property, improves the foam action due to the albumin adsorption in the films surface which stabilizes the foam [6, 7].
The use of 0.3 wt.% dispersant optimized the suspensions with 68 wt. % solids percentage, resulting in adjusted properties in the foam production
Online since: August 2019
Authors: Marco Corradi, Romina Sisti, Antonio Borri, Alessio Molinari, Chiara Quintaliani
Test results show that the lateral load capacity of the panels is highly affected by construction defects.
These blocks were not used for construction of load-bearing walls, but it became soon evident that by reducing the voids volume and increasing the dimensions of the blocks, it was possible to develop a structural block, with positive characteristics in terms mechanical properties, and ease and reduced time of installation.
It was concluded by these studies that the action of the retrofitting fibers (glass, carbon, Kevlar or basalt) might have been a contributing factor for an increment of the masonry’s tensile strength.
The mechanical properties of the CFRP reinforcement are summarized in Table 1.
Mechanical properties of the CFRP reinforcement Dry fiber thickness (mm) 0.165 Fiber Orientation Unidirectional Fiber Density (kg/m2) 0.300 Matrix type Epoxy Number of tested samples 10 Mean tensile strength (MPa) 3324 CoV (tensile strength) (%) 18.1 Young’s Modulus (GPa) 312.2 CoV (Young’s modulus) (%) 19.2 CoV=Coefficient of Variation Figure 5.
These blocks were not used for construction of load-bearing walls, but it became soon evident that by reducing the voids volume and increasing the dimensions of the blocks, it was possible to develop a structural block, with positive characteristics in terms mechanical properties, and ease and reduced time of installation.
It was concluded by these studies that the action of the retrofitting fibers (glass, carbon, Kevlar or basalt) might have been a contributing factor for an increment of the masonry’s tensile strength.
The mechanical properties of the CFRP reinforcement are summarized in Table 1.
Mechanical properties of the CFRP reinforcement Dry fiber thickness (mm) 0.165 Fiber Orientation Unidirectional Fiber Density (kg/m2) 0.300 Matrix type Epoxy Number of tested samples 10 Mean tensile strength (MPa) 3324 CoV (tensile strength) (%) 18.1 Young’s Modulus (GPa) 312.2 CoV (Young’s modulus) (%) 19.2 CoV=Coefficient of Variation Figure 5.
Online since: February 2014
Authors: Sib Krishna Ghoshal, Khaidzir Hamzah, Nur Alia Fauzia Abdullah, Md Rahim Sahar
The effect of silver nanoparticles on the luminescent properties of the samarium-doped sodium tellurite glass is investigated.
Annealing is done to eliminate thermal and mechanical stresses.
The relative enhancement factors of various emission wavelengths are listed in Table 1 and its graph is shown in Fig.2.
Many other factors should be taken into account such as radiative lifetime, luminescence decay, size and shape of NPs, and also by employing suitable theory and models.
“Optical Properties and Spectroscopy of Nanomaterials”.
Annealing is done to eliminate thermal and mechanical stresses.
The relative enhancement factors of various emission wavelengths are listed in Table 1 and its graph is shown in Fig.2.
Many other factors should be taken into account such as radiative lifetime, luminescence decay, size and shape of NPs, and also by employing suitable theory and models.
“Optical Properties and Spectroscopy of Nanomaterials”.
Online since: January 2014
Authors: Hua Dong Xu
Vehicle handling stability is an important factor of vehicle active safety [1].
In fact, there are many nonlinear factors affect vehicle performances.
This shows that the higher the speed is the more obvious the tire non-linear characteristics affect.
Affected by tire nonlinear characteristics the carriages roll angle will go through a long time to tend to a stable value.
[6] Zhao You-qun, Yin Hao, Zhang Gui-xia: Mechanical Science and Technology Vol. 24(2005), p. 1138.
In fact, there are many nonlinear factors affect vehicle performances.
This shows that the higher the speed is the more obvious the tire non-linear characteristics affect.
Affected by tire nonlinear characteristics the carriages roll angle will go through a long time to tend to a stable value.
[6] Zhao You-qun, Yin Hao, Zhang Gui-xia: Mechanical Science and Technology Vol. 24(2005), p. 1138.
Online since: March 2013
Authors: Wen Zhao, Yi Li, Lu Zhang, Yong Ping Guan
Make containers use fiber concrete to replace the ordinary concrete, will beneficial to improve the mechanical properties of concrete[5].
The basic assumptions of carbonized life analysis Actually, the process of concrete carbonation is very complex, which should be appropriately simplified on the basis of meeting engineering demand and considering the main factors affecting the carbonation of concrete` in order to design the parameters of model test.
(14) Generally, The concrete carbonation speed is directly proportional to the square root of the CO2 concentration: (15) Where: kc is CO2 concentration affect coefficient; kc =0.742-0.224lgC.
[2] Z.D.Wang, Research and Evaluation on the Deteriotation of Concrete Subject to Multi-factor, China building materials academy,Beijing, 2010
[8] X.M.Wan, Deterioration Mechanisms of Reinforced Concrete Structures under Combined Mechanical and Environmental Action, Xi’an University of Architecture & Technolog, 2011
The basic assumptions of carbonized life analysis Actually, the process of concrete carbonation is very complex, which should be appropriately simplified on the basis of meeting engineering demand and considering the main factors affecting the carbonation of concrete` in order to design the parameters of model test.
(14) Generally, The concrete carbonation speed is directly proportional to the square root of the CO2 concentration: (15) Where: kc is CO2 concentration affect coefficient; kc =0.742-0.224lgC.
[2] Z.D.Wang, Research and Evaluation on the Deteriotation of Concrete Subject to Multi-factor, China building materials academy,Beijing, 2010
[8] X.M.Wan, Deterioration Mechanisms of Reinforced Concrete Structures under Combined Mechanical and Environmental Action, Xi’an University of Architecture & Technolog, 2011
Online since: March 2018
Authors: Hao Sun, Yangfen CAO, Ling Jun Wei, Jing Qian, Li Qiang Wang, Xin Chang Zhang
Based on these analysis and summarization, make use of treated sludge, waste paper fibers and industrial waste wood chips as raw materials, adding other environmental protection additives to prepare a kind of biomass foaming material which has low quality, low density and good mechanical properties.
There are many differences between China and other countries in biodegradable packaging materials, others generally used waste agricultural products or food [4, 5], and studied the biodegradable properties, including whether have degradation, the degradation time and after degradation whether it is friendly to the environment [6, 7, 8].
While China preferred to choose straw or waste paper [12, 13], and studied the mechanical properties and influencing factors, For example Academy of experts in Jiangsu Agricultural Sciences [14] used waste agricultural straw successfully developed the environmental protection straw flowerpot, it is biodegradable and beneficial to the growth of plant.
The density changed because added wood chips increased the viscosity, affected the foaming effect.
There are many differences between China and other countries in biodegradable packaging materials, others generally used waste agricultural products or food [4, 5], and studied the biodegradable properties, including whether have degradation, the degradation time and after degradation whether it is friendly to the environment [6, 7, 8].
While China preferred to choose straw or waste paper [12, 13], and studied the mechanical properties and influencing factors, For example Academy of experts in Jiangsu Agricultural Sciences [14] used waste agricultural straw successfully developed the environmental protection straw flowerpot, it is biodegradable and beneficial to the growth of plant.
The density changed because added wood chips increased the viscosity, affected the foaming effect.
Online since: December 2009
Authors: Bing Yan Jiang, Jian Liang Hu, Wang Qing Wu, Shu Ye Pan
As
one of the key techniques of the popularization for MEMS, MIM has many advantages such as low
production cost, shaping complexity, material multi-applicability, good tolerance and mechanical
properties, etc [3].
Polymer plastification method has significant effect on the melt flow properties.
All these problems should be solved gradually for getting good melt flow properties.
The basic properties are shown in Tab.2.
Tab.2 Properties of HDPE-8008 Properties Density(g/cm3) Specific heat(J/kg·K) Melt point(°C) values 0.946 2303 135 Procedure 1) Polymer ultrasonic plastification with the parameters as shown in Tab.3.
Polymer plastification method has significant effect on the melt flow properties.
All these problems should be solved gradually for getting good melt flow properties.
The basic properties are shown in Tab.2.
Tab.2 Properties of HDPE-8008 Properties Density(g/cm3) Specific heat(J/kg·K) Melt point(°C) values 0.946 2303 135 Procedure 1) Polymer ultrasonic plastification with the parameters as shown in Tab.3.
Online since: September 2010
Authors: D. Bravo-Bárcenas, E. Hernández-Sánchez, J.A. Jiménez-Bernal, Ivan Campos-Silva, M. Ortíz-Domínguez, O. Bravo-Bárcenas, Marco Antonio Doñu-Ruíz, J. Martínez-Trinidad, Y. Domínguez-Galicia
., 07740, México
a
icampos@ipn.mx, b
mortizd@ipn.mx,
cenhernandezs@ipn.mx, ddbravob0200@ipn.mx,
e
obravob0800@ipn.mx,
fmdonur0800@ipn.mx,
gjomartinezt@ipn.mx,
h
ydominguez@ipn.mx
Keywords: boriding; boride layers; fracture indentation; mechanical properties; fracture toughness;
Palmqvist cracks models.
Mono-phase layers have better properties.
The cracks produced by mechanical contact between the indenter and the material surface, essentially depend on the geometry of the indenter and the applied load.
In brittle polycrystalline materials, the microstructure affects the indentation cracks in a number of ways, such as crack termination at porosity and/or grain boundaries normal to the crack path and crack deflection along grain boundaries.
From equation (1), the indentation load is expressed as: (2) 0.0319 CK P d a Multiplying both terms in equation (2) by /da factor, it results: 2 1/2 (3) 0.0319 CKd P d a a Also, the relation used to obtain the Kc in the boride layer, shows that the ratio between the applied load and the factor 2 1/2 da should be constant.
Mono-phase layers have better properties.
The cracks produced by mechanical contact between the indenter and the material surface, essentially depend on the geometry of the indenter and the applied load.
In brittle polycrystalline materials, the microstructure affects the indentation cracks in a number of ways, such as crack termination at porosity and/or grain boundaries normal to the crack path and crack deflection along grain boundaries.
From equation (1), the indentation load is expressed as: (2) 0.0319 CK P d a Multiplying both terms in equation (2) by /da factor, it results: 2 1/2 (3) 0.0319 CKd P d a a Also, the relation used to obtain the Kc in the boride layer, shows that the ratio between the applied load and the factor 2 1/2 da should be constant.
Online since: October 2015
Authors: Wen Yan Lin, Jin Hong Wu, Yong Sheng Huang, Xin Qiu, Yu Jie Wang
B.L.Chen[1] considered that it was worth to promote and apply the ionic soil stabilizer to the highway roadbed and pavement, because it had a good a very good improvement effect for the physical and mechanical properties of the soil.
Q.B.Liu[4] indicated that the ionic soil improved the expansion and physical and mechanical properties of expansive soil by reducing the shrinking properties and expansibility and increasing the shear behavior.
Jones and Eng[9] has studied a sulphonated oil additive in order to characterize its action effect with mechanical property index.
However, the curing mechanism and controlling factors of the ionic soil stabilizer are so complex that the treatment technology is far from mature, which involved regional geology, hydrology, climate condition and highway criterion.
Basic Properties of Materials Properties of Typical Soil.
Q.B.Liu[4] indicated that the ionic soil improved the expansion and physical and mechanical properties of expansive soil by reducing the shrinking properties and expansibility and increasing the shear behavior.
Jones and Eng[9] has studied a sulphonated oil additive in order to characterize its action effect with mechanical property index.
However, the curing mechanism and controlling factors of the ionic soil stabilizer are so complex that the treatment technology is far from mature, which involved regional geology, hydrology, climate condition and highway criterion.
Basic Properties of Materials Properties of Typical Soil.
Online since: December 2012
Authors: Jun Neng Ye, Chen Bin
Combined with the of Ningbo metro, this paper adopts the finite element method to analyze two sides of affecting factors, i.e., construction load and the distance between the loading position and the horizontal projection distance of the tunnel, so as to study the impact of shallow foundation load on the displacement of adjacent existing shield-tunnel, and affecting law is analyzed, which can be used to guide the practice of engineering construction.
Physical and mechanical property parameters of major soil layers Plaxis2D program is useded to set up the plane model, in which the depth of the model in direction of the shallow foundation is 50m, the depth of the tunnel is 9m, the width of load is 10m, the construction load and the net distance between the construction and the horizontal projection of the tunnel are variables.
As there are differences between physical and mechanical indexes of the sub-layers in the same soil layer, from the point of view of safety, this paper chose the group of geological parameters in sub-layers of the same layer in Chart.1 whose compression modulus are small.
Physical and mechanical property parameters of major soil layers Plaxis2D program is useded to set up the plane model, in which the depth of the model in direction of the shallow foundation is 50m, the depth of the tunnel is 9m, the width of load is 10m, the construction load and the net distance between the construction and the horizontal projection of the tunnel are variables.
As there are differences between physical and mechanical indexes of the sub-layers in the same soil layer, from the point of view of safety, this paper chose the group of geological parameters in sub-layers of the same layer in Chart.1 whose compression modulus are small.