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Online since: February 2013
Authors: Janusz Pobędza, Andrzej Sobczyk
Microscopic picture of columnar nanostructured coating [5]
Fig. 4 illustrates friction properties, taken from friction tests [5], after 105 fretting cycles for steel with CNC and DLC coatings.
Cylinder friction force is varied and depends on few factors like: cylinder velocity, pressure and temperature.
The first stage of research were dedicated to determine properties of singular cartridge valve 2-URES-6 installed in two way body.
The use of water reduces pressure losses by half, positively affecting energy efficiency of the high pressure water hydraulic system.
Covering the inside surface of the cylinder and the piston and piston rod surface confirms the protective properties of novel coatings against corrosion of steel parts, together with acceptable values of hydro-mechanical efficiency, not different from characteristics of oil actuators.
Cylinder friction force is varied and depends on few factors like: cylinder velocity, pressure and temperature.
The first stage of research were dedicated to determine properties of singular cartridge valve 2-URES-6 installed in two way body.
The use of water reduces pressure losses by half, positively affecting energy efficiency of the high pressure water hydraulic system.
Covering the inside surface of the cylinder and the piston and piston rod surface confirms the protective properties of novel coatings against corrosion of steel parts, together with acceptable values of hydro-mechanical efficiency, not different from characteristics of oil actuators.
Online since: December 2012
Authors: Feng Rao Lang
A study on Preparation Methods of LiNi0.5Mn0.5O2
Cathode Materials1
Fengrao Lang
College of Mechanical and Architecture Engineering, Jilin Agricultural Science and Technology University, Jilin 132101,Jilin Province,China
fengrao1982@163.com
Keywords: Cathode materials, LiNi0.5Mn0.5O2 ,co-precipitation
Abstract.
In preparing LiNi0.5Mn0.5O2 materials by coprecipitation method, temperature on the properties of materials have great effect, low temperature, crystallization of the material is not very good, the grain size is even, the temperature is too high, so the reunion phenomenon is serious, the electrochemical performances of the materials is relatively large, affect the service life of the battery.
For the three samples, from burning 9 hours to 12 hours, the value of I(003)/I(104) is in a gradual increase, compared to the samples with burning to 22 hours and 12 hours , the value of I (003) /I (104) is reduced, it also explains the12 hours of calcined sample dislocation is less, lattice is more orderly, and crystal generates better. 2.3 Effects on the materials by cooling and ultrasonic wave decentralized processing Self-cooling and ultrasonic wave decentralized processing have significant effects on electro chemical property of materials.
And this method makes the reactants more superior and the presoma has superiority. 2.4 Observation of morphology of LiNi0.5Mn0.5O2 by SEM Fig.3 SEM chart of LiNi0.5Mn0.5O2 Scanned by electron microscopic of LiNi0.5Mn0.5O2, it shows even uniform, particle agglomeration of moderate size, granules are essentially the same shape, so the materials are ideally. 3 Conclusion So anode material prepared by coprecipitation method has the advantages of itself, uniformity granule and fine layered structure as well in considering various kinds of influence factors on synthesis method of optimization, testing by XRD, SEM characterization .It can play maximum properties of the cathode materials.
In preparing LiNi0.5Mn0.5O2 materials by coprecipitation method, temperature on the properties of materials have great effect, low temperature, crystallization of the material is not very good, the grain size is even, the temperature is too high, so the reunion phenomenon is serious, the electrochemical performances of the materials is relatively large, affect the service life of the battery.
For the three samples, from burning 9 hours to 12 hours, the value of I(003)/I(104) is in a gradual increase, compared to the samples with burning to 22 hours and 12 hours , the value of I (003) /I (104) is reduced, it also explains the12 hours of calcined sample dislocation is less, lattice is more orderly, and crystal generates better. 2.3 Effects on the materials by cooling and ultrasonic wave decentralized processing Self-cooling and ultrasonic wave decentralized processing have significant effects on electro chemical property of materials.
And this method makes the reactants more superior and the presoma has superiority. 2.4 Observation of morphology of LiNi0.5Mn0.5O2 by SEM Fig.3 SEM chart of LiNi0.5Mn0.5O2 Scanned by electron microscopic of LiNi0.5Mn0.5O2, it shows even uniform, particle agglomeration of moderate size, granules are essentially the same shape, so the materials are ideally. 3 Conclusion So anode material prepared by coprecipitation method has the advantages of itself, uniformity granule and fine layered structure as well in considering various kinds of influence factors on synthesis method of optimization, testing by XRD, SEM characterization .It can play maximum properties of the cathode materials.
Online since: June 2014
Authors: Ya Ya Gu, Chun Hu Li, Ning Guo, Ying Fei Hou
This article uses Agrobacterium tumefaciens UP-3 with independent intellectual property rights of our own as the oil biodesulfurization bacterium.
Results and discussion Desulfurization performance of growth cells The growth of microorganisms was not only affected by the medium, but also greatly influenced by temperature, pH, pressure, ventilation status and other factors of growth environment.
Among them, the immobilized material is an important factor affecting the immobilized effect, and the principle of selection of the immobilized material is low cost, easy operation, high activity of immobilized microorganisms, long life and so on.
So it's necessary to select the proper concentration in order to facilitate the immobilization process and keep the better mechanical strength.
But when the SA concentration further reduces with PVA concentration rising, the inner structure of immobilized balls becomes much compacter, affecting the diffusion of substrates and reaction products, reducing the activity of embedded cells and the degradation performance of immobilized cells.
Results and discussion Desulfurization performance of growth cells The growth of microorganisms was not only affected by the medium, but also greatly influenced by temperature, pH, pressure, ventilation status and other factors of growth environment.
Among them, the immobilized material is an important factor affecting the immobilized effect, and the principle of selection of the immobilized material is low cost, easy operation, high activity of immobilized microorganisms, long life and so on.
So it's necessary to select the proper concentration in order to facilitate the immobilization process and keep the better mechanical strength.
But when the SA concentration further reduces with PVA concentration rising, the inner structure of immobilized balls becomes much compacter, affecting the diffusion of substrates and reaction products, reducing the activity of embedded cells and the degradation performance of immobilized cells.
Online since: June 2021
Authors: Li Li Wang, Long Pei Dong, Shu Yang, Bin Shen, Wei Yang, Jian Sheng Yao, Zeng Li Wang
In order to balance the mechanical properties or stabilize the microstructure of the superalloys, active elements such as Ti, Cr and Hf are usually added in most type of superalloys [1-4].
It has the advantages of high temperature strength, good comprehensive properties, stable structure and good casting property.
The infiltration depth of high temperature molten alloy to ceramic core is influenced by several factors, such as the contact angle between molten alloy and ceramic core, the infiltration time, the saturated vapor pressure of alloy ingredient, the porosity of ceramic core, the interface reaction between molten alloy and ceramic core.
Therefore, the main factors affecting the infiltration of molten alloy to ceramic core are the evaporation diffusion of alloy ingredient, the porosity of ceramic core, and the infiltration time.
Ceramic/metal interface structures and their relationship to atomic- and meso-scale properties.
It has the advantages of high temperature strength, good comprehensive properties, stable structure and good casting property.
The infiltration depth of high temperature molten alloy to ceramic core is influenced by several factors, such as the contact angle between molten alloy and ceramic core, the infiltration time, the saturated vapor pressure of alloy ingredient, the porosity of ceramic core, the interface reaction between molten alloy and ceramic core.
Therefore, the main factors affecting the infiltration of molten alloy to ceramic core are the evaporation diffusion of alloy ingredient, the porosity of ceramic core, and the infiltration time.
Ceramic/metal interface structures and their relationship to atomic- and meso-scale properties.
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.
Online since: August 2017
Authors: Samad Dadvandipour, Samad Nadimi Bavil Oliaei, Bahram Lotfi Sadigh
Different types of properties are assigned to these instances.
In fact these properties are assigned to the instances mother classes therefore these instances inherit assigned properties eventually.
These properties are called “Data properties” in ontology model.
Developed ontology model is including hundreds of classes, properties, and relations.
Wire deflection, discharge gap variation and lateral vibration of the wire are the main factors influencing KERF [4].
In fact these properties are assigned to the instances mother classes therefore these instances inherit assigned properties eventually.
These properties are called “Data properties” in ontology model.
Developed ontology model is including hundreds of classes, properties, and relations.
Wire deflection, discharge gap variation and lateral vibration of the wire are the main factors influencing KERF [4].
Online since: May 2011
Authors: Qi Guo, Shuan Hai He
At present, there exist some random factors both in design and construction stage and in service stage as far as whole life cycle is concerned, which contribute more to deviation between calculated value and practical value of effective prestress.
This may greatly affect the durability and life, and even lead to safety disaster [2,3].
However, limited by something such as properties of concrete and reinforcement, maintenance and humidity condition, craft for prestressing and so on, the NDT technique on prestressing strand is still start from scratch [4-6].
Fig.9 Large-scale beam model Fig.10 Distribution of Effective prestress for Z2 tendon Conclusions ●Because this technique rely on static balance equilibrium and synthesize many aspects’ influential factors including local deformation, analogy boundary condition, bending and tensile stiffness of stretching cable wire etc, it has the advantages of clear concept and strong adaptability.
Mechanical Systems and Signal Processing, Vol. 20 (2006) , p. 2186
This may greatly affect the durability and life, and even lead to safety disaster [2,3].
However, limited by something such as properties of concrete and reinforcement, maintenance and humidity condition, craft for prestressing and so on, the NDT technique on prestressing strand is still start from scratch [4-6].
Fig.9 Large-scale beam model Fig.10 Distribution of Effective prestress for Z2 tendon Conclusions ●Because this technique rely on static balance equilibrium and synthesize many aspects’ influential factors including local deformation, analogy boundary condition, bending and tensile stiffness of stretching cable wire etc, it has the advantages of clear concept and strong adaptability.
Mechanical Systems and Signal Processing, Vol. 20 (2006) , p. 2186
Online since: June 2019
Authors: Dalibor Kocáb, Barbara Kucharczyková
The flooring compounds discussed herein are defined in terms of consistency and basic hardened-state properties.
The flooring compounds are described in terms of their fresh- and hardened-state properties.
Or, conversely, their composition and fresh-state properties do not allow them to be cast into specimens required by the standard [14].
Hoffman, Effect of redispersible powders on the properties of self-levelling compounds, Technical paper, Wacker Polymer Systems
Anderberg, Moisture properties of self-levelling flooring compounds Division of Building Materials, LTH, Lund University, 2004
The flooring compounds are described in terms of their fresh- and hardened-state properties.
Or, conversely, their composition and fresh-state properties do not allow them to be cast into specimens required by the standard [14].
Hoffman, Effect of redispersible powders on the properties of self-levelling compounds, Technical paper, Wacker Polymer Systems
Anderberg, Moisture properties of self-levelling flooring compounds Division of Building Materials, LTH, Lund University, 2004
Online since: July 2011
Authors: Rachid Ellaia, Norelislam Elhami, Mhamed Itmi
However, the designer reduces the structural cost without taking into account uncertainties concerning material properties, geometric dimension and loading.
In Deterministic Design Optimization (DDO), the system safety may be taken into account by assigning safety factors to certain structural parameters.
Suitable geometry, material properties and loads are assumed, and an analysis is then performed to provide a detailed behavior of the structure.
Low reliability level: when choosing small values of safety factors or bad distribution of these factors, the structural reliability level may be too low to be admissible.
In the structural analysis of engineering design, there exist uncertainties in loading, material properties, geometry, and environmental conditions.
In Deterministic Design Optimization (DDO), the system safety may be taken into account by assigning safety factors to certain structural parameters.
Suitable geometry, material properties and loads are assumed, and an analysis is then performed to provide a detailed behavior of the structure.
Low reliability level: when choosing small values of safety factors or bad distribution of these factors, the structural reliability level may be too low to be admissible.
In the structural analysis of engineering design, there exist uncertainties in loading, material properties, geometry, and environmental conditions.
Online since: July 2014
Authors: S. Srikiran, K. Ramji, B. Satyanarayana
S.Srikiran1, K.Ramji2, B.Satyanarayana3
1 Research Scholar, Dept. of Mechanical Engineering, A.U.
Professor, Dept. of Mechanical Engineering, A.U.
The study of lubrication properties of Graphite are carried out over the past several decades.
The increase in the forces when the size of the particles is decreased in the nano level attributes to the conceptual model developed by Ramana et al [14] which talks about the agglomeration of particles at the chip – tool interface leading to the properties of sticking and interlocking of the solid lubricant particles.
Conclusion The investigation of this study indicates that the process parameters feed rate, cutting speed, depth of cut and size of the nano-level graphite powder are the primary influencing factors which affect the cutting forces, tool temperature and indicate the level of surface roughness obtained.
Professor, Dept. of Mechanical Engineering, A.U.
The study of lubrication properties of Graphite are carried out over the past several decades.
The increase in the forces when the size of the particles is decreased in the nano level attributes to the conceptual model developed by Ramana et al [14] which talks about the agglomeration of particles at the chip – tool interface leading to the properties of sticking and interlocking of the solid lubricant particles.
Conclusion The investigation of this study indicates that the process parameters feed rate, cutting speed, depth of cut and size of the nano-level graphite powder are the primary influencing factors which affect the cutting forces, tool temperature and indicate the level of surface roughness obtained.