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Online since: September 2013
Authors: Jun Lin Wan, Kang Lv, Qin Jian Mao, Yuan Yuan Zhou, Shan Shan Yang
Consider the airworthiness of civil aviation, the airborne circumstances and the medical rescue requirements during the casualty evacuation, stretcher bracket not only need to have the good structure design and light weight, and also have the good mechanical properties [3,4].
The design of a stretcher bracket is affected by a wide range of requirements as these are prescribed bracketing height, placement of three stretchers and patients, intensity and stiffness requirements and of course costs and appearance, product life-time and maintenance consideration.
According to the references [11,12], the factor of unidirectional limit load and the calculated results of components quantity of attachment structure are shown in Table 3.
As mentioned earlier, the limit load factor and the unidirectional limit load cases are shown in Table 4.
All the analyses show that the maximum stress is less than permissible stress, and that the stress level and the safety factor can also meet the requirement of strength specification.
The design of a stretcher bracket is affected by a wide range of requirements as these are prescribed bracketing height, placement of three stretchers and patients, intensity and stiffness requirements and of course costs and appearance, product life-time and maintenance consideration.
According to the references [11,12], the factor of unidirectional limit load and the calculated results of components quantity of attachment structure are shown in Table 3.
As mentioned earlier, the limit load factor and the unidirectional limit load cases are shown in Table 4.
All the analyses show that the maximum stress is less than permissible stress, and that the stress level and the safety factor can also meet the requirement of strength specification.
Online since: October 2011
Authors: Jin Xi Liu, Yan Ping Kong, Qian Yang
Danoyan and Piliposian [5] investigated the propagation properties of Love waves in a piezoelectric substrate carrying a hard dielectric layer.
Our objective is to reveal how dispersion characteristics are affected by material anisotropy.
For the above problem, the mechanical displacement w and the stresses (szx, szy) in the layer satisfy the following equations: (1) (2) where c44, c45 and c55 are the elastic constants; ρ is the mass density; an index after the comma denotes partial differentiation with respect to corresponding coordinates x and y; a superimposed dot denotes differentiation with respect to the time t.
(9) Solving the above equation, one obtains , (10) where is a dimensionless factor that reflects the layer anisotropiy and ; , where is the velocity of shear bulk wave in piezoelectric materials.
Their properties are: , and as well as , , and .
Our objective is to reveal how dispersion characteristics are affected by material anisotropy.
For the above problem, the mechanical displacement w and the stresses (szx, szy) in the layer satisfy the following equations: (1) (2) where c44, c45 and c55 are the elastic constants; ρ is the mass density; an index after the comma denotes partial differentiation with respect to corresponding coordinates x and y; a superimposed dot denotes differentiation with respect to the time t.
(9) Solving the above equation, one obtains , (10) where is a dimensionless factor that reflects the layer anisotropiy and ; , where is the velocity of shear bulk wave in piezoelectric materials.
Their properties are: , and as well as , , and .
Online since: September 2011
Authors: Jarosław Sep
Selected Properties of Bearings with Helical Groove on the Journal
SEP Jaroslaw
Rzeszow University of Technology
Faculty of Mechanical Engineering and Aeronautics, W.
The paper presents results of tests concerning slide bearing with helical groove on the journal selected properties.
Change of the bearing journal design is one of the possibilities of destructive hard particles affect decrease.
Intensify of oil flow through bearing is a substantial factor of possible effect on easier contaminations removal from bearing and then wear decrease.
Sep, The oil film properties in journal bearings with non-typical geometry.
The paper presents results of tests concerning slide bearing with helical groove on the journal selected properties.
Change of the bearing journal design is one of the possibilities of destructive hard particles affect decrease.
Intensify of oil flow through bearing is a substantial factor of possible effect on easier contaminations removal from bearing and then wear decrease.
Sep, The oil film properties in journal bearings with non-typical geometry.
Online since: November 2012
Authors: Thanyarat Singhanart, Chartchai Srimontok, Natnapat Pisitpan, Satid Chitimaworaphan, Wutthikorn Mongkhonchaiwiwat
The result from finite element analysis shows that the maximum stress is less than the material’s strength with safety factor of 1.1.
The drop height for the dynamic drop test is affected by the vertical velocity of the aircraft before landing.
The plywood and the woven fiberglass layer are considered to be isotropic on its plane due to the same properties in each direction [5].
Material properties are assumed to be isotropic according to materials selection process.
It can be seen that safety factor of this fuselage is 1.1 and the mass of the fuselage is found to be 0.813kg.
The drop height for the dynamic drop test is affected by the vertical velocity of the aircraft before landing.
The plywood and the woven fiberglass layer are considered to be isotropic on its plane due to the same properties in each direction [5].
Material properties are assumed to be isotropic according to materials selection process.
It can be seen that safety factor of this fuselage is 1.1 and the mass of the fuselage is found to be 0.813kg.
Online since: May 2014
Authors: Max Schwade, Fritz Klocke, Andreas Klink
Due to the numerous influencing factors and their interdependencies it is normally not possible to analyze the impact of each input parameter of a typical EDM technology on the continuous process separately making the correlation of input and output parameters very difficult.
But despite the superior properties these implants remain a foreign object inside the body.
The significantly different mechanical properties compared to the surrounding tissue often lead to a failure of the implant after 10-15 years due to a loosening of the implant seat caused for example by the stress shielding effect [2].
Fig. 3: Excerpt of the thermal and electric properties of the investigated alloys The reason for the significantly larger crater volumes are most probably caused by the difference in the thermal properties of steel compared to the magnesium alloys, which are given in Fig. 3.
This among other factors could be a reason why higher material removal rates are achieved using graphite for long discharge durations compared to copper.
But despite the superior properties these implants remain a foreign object inside the body.
The significantly different mechanical properties compared to the surrounding tissue often lead to a failure of the implant after 10-15 years due to a loosening of the implant seat caused for example by the stress shielding effect [2].
Fig. 3: Excerpt of the thermal and electric properties of the investigated alloys The reason for the significantly larger crater volumes are most probably caused by the difference in the thermal properties of steel compared to the magnesium alloys, which are given in Fig. 3.
This among other factors could be a reason why higher material removal rates are achieved using graphite for long discharge durations compared to copper.
Online since: February 2020
Authors: Odelsia Leonor Sánchez Alsina, Acácia Lima Silva, Gabriel Francisco Silva, Luciano Fernandes Monteiro, Álvaro Silva Lima
Harvesting takes place in an extractive way, much of which is wasted due to factors such as seasonality, high moisture content and inadequate postharvest techniques [2].
This kind of processing does not intend to regenerate the properties and characteristics of the fresh fruit by rehydration but instead the dried fruit constitutes a new product, being consumed directly or used in the formulation of confectionery products, among others [3].
The samples were wiped gingerly with absorbent paper (towel paper) to remove excess water, being careful to avoid mechanical damages.
The OD in mechanical orbital agitation was performed at 60 rpm and 64 °Brix, while in ultrasonic bath it occurred at 20W and 60 °Brix.
In addition to the weather conditions, pseudo-equilibrium moisture and diffusion coefficient are affected by the structural and size changes that occur with the mangabas during drying.
This kind of processing does not intend to regenerate the properties and characteristics of the fresh fruit by rehydration but instead the dried fruit constitutes a new product, being consumed directly or used in the formulation of confectionery products, among others [3].
The samples were wiped gingerly with absorbent paper (towel paper) to remove excess water, being careful to avoid mechanical damages.
The OD in mechanical orbital agitation was performed at 60 rpm and 64 °Brix, while in ultrasonic bath it occurred at 20W and 60 °Brix.
In addition to the weather conditions, pseudo-equilibrium moisture and diffusion coefficient are affected by the structural and size changes that occur with the mangabas during drying.
Online since: October 2012
Authors: Jian Long Zheng, Xiao Chen
Lu applied finite element numerical simulation to study the asphalt mixture viscoelasticplastic mechanical deformation properties, and the application of pavement performance evaluation and permanent deformation of asphalt layer are successful obtained [3].
Khaled Anwar Kandil studied the effects of gradation characteristic and material properties on the asphalt mixture compaction by indoor and field tests, and the established two compaction model of indoor and outdoor to the evaluate compaction quality[4].
Thus, gradations of asphalt mixture, compaction, quality control method and theory have significant impacts on asphalt mixture compaction properties.
Asphalt Mixture Compaction Deformation Theory 2.1 Dense deformation principle Hot asphalt mixture comprises asphalt binder with heat flux properties, the gravel aggregate supported by a framework and a kind of gas.
And the compaction thickness data can be converted as follows: (36) Whereis compaction layer thickness after roller N times ; theory layer thickness for rolled thickness infinite times ;is the rolled layer thickness initially ( mixture paving thickness ); N rolled times; influence factors rolling deformation speed.
Khaled Anwar Kandil studied the effects of gradation characteristic and material properties on the asphalt mixture compaction by indoor and field tests, and the established two compaction model of indoor and outdoor to the evaluate compaction quality[4].
Thus, gradations of asphalt mixture, compaction, quality control method and theory have significant impacts on asphalt mixture compaction properties.
Asphalt Mixture Compaction Deformation Theory 2.1 Dense deformation principle Hot asphalt mixture comprises asphalt binder with heat flux properties, the gravel aggregate supported by a framework and a kind of gas.
And the compaction thickness data can be converted as follows: (36) Whereis compaction layer thickness after roller N times ; theory layer thickness for rolled thickness infinite times ;is the rolled layer thickness initially ( mixture paving thickness ); N rolled times; influence factors rolling deformation speed.
Online since: May 2023
Authors: Diana Mamani-Rivera, Yosheff Ortiz-Valdivia, Francisco Velasco, Danny Tupayachy-Quispe, Jonathan Almirón
This acid is also widely used in the biomedical field due to its antibacterial and low toxicity properties [7, 8].
One of them is polyvinyl alcohol (PVA), used to obtain nanofibers in biomedical applications due to its mechanical properties and its known characteristics of biodegradability, biocompatibility and water solubility [9,10].
Experimental investigation of the properties of electrospun nanofibers for potential medical application.
Factors that interact with the antibacterial action of thyme essential oil and its active constituents.
Electrospinning, mechanical properties, and cell behavior study of chitosan/PVA nanofibers.
One of them is polyvinyl alcohol (PVA), used to obtain nanofibers in biomedical applications due to its mechanical properties and its known characteristics of biodegradability, biocompatibility and water solubility [9,10].
Experimental investigation of the properties of electrospun nanofibers for potential medical application.
Factors that interact with the antibacterial action of thyme essential oil and its active constituents.
Electrospinning, mechanical properties, and cell behavior study of chitosan/PVA nanofibers.
Online since: July 2012
Authors: Jian Min Yi, Yong Bing Liu, Xing Wu, Yue Jin Liu
The properties of risocaine were listed in table 1, Tc and Pc was estimated by the Joback modification of Lydersen’s method, ω was estimated by Ednister method.
The parameter a, b for each pure fluid were evaluated from its critical properties and acentric factor as listed in table 1.
However, using Peng–Robinson EOS model to correlate the solubility of organic solid, we should get many fundamental data of physical properties: critical temperature, critical pressure, boiling point, acentric factor and so on.
It may be explained that pressure factor has already been considered in the factor of density when we employ Chrastil model to correlate solubility dates.
Modeling Solubility of Solids in Supercritical Fluids using Fusion Properties.
The parameter a, b for each pure fluid were evaluated from its critical properties and acentric factor as listed in table 1.
However, using Peng–Robinson EOS model to correlate the solubility of organic solid, we should get many fundamental data of physical properties: critical temperature, critical pressure, boiling point, acentric factor and so on.
It may be explained that pressure factor has already been considered in the factor of density when we employ Chrastil model to correlate solubility dates.
Modeling Solubility of Solids in Supercritical Fluids using Fusion Properties.
Online since: April 2016
Authors: Jiří Moskalík
Deposits can too affect the shape of flue gas channel and thereby reduce his size.
Thermal conductivity of fouling material is very important factor in calculation of heat transmission index.
Evidence of fouling in operational parameters of the incinerator First, we have to select modes of equipment operation before and after the shutdown that have the most similar operational parameters, otherwise the assessment of fouling affects is incorrect.
Evaluation of properties and impact of the deposits is an interdisciplinary issue, where are combined knowledge from Physic, Chemistry and power engineering.
In general, it seems appropriate to study how various aspects affect the equipment in order to improve their operations.
Thermal conductivity of fouling material is very important factor in calculation of heat transmission index.
Evidence of fouling in operational parameters of the incinerator First, we have to select modes of equipment operation before and after the shutdown that have the most similar operational parameters, otherwise the assessment of fouling affects is incorrect.
Evaluation of properties and impact of the deposits is an interdisciplinary issue, where are combined knowledge from Physic, Chemistry and power engineering.
In general, it seems appropriate to study how various aspects affect the equipment in order to improve their operations.