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Online since: September 2013
Authors: Qiu Ping Chen, Qiu Ling Chen, Hui Wang
Introduction
Due to its unique Magneto-Optical (MO) property, the MO fiber based sensors are very interesting to many applications related to Faraday Effect such as magneto-optical current transformers (MOCT) [1-2] which provides numerous advantages over the conventional transformers, such as contactless, small volume and cost efficient etc.
The fiber used in this study is telluride TZN fiber, thanks to their perfect thermal stability, good optical properties at infrared wavelengths and high magneto-optical property caused by high polarizability of Te4+ ions [9], the TZN fiber is good candidate for MOCT applications.
When the linearly polarized light propagates through the fiber, the birefringence will be induced for mechanical stresses, imperfection of fiber etc.
Careful alignment was carried out to eliminate the alterations in the polarization due to external factors.
During the measurement, there existed many factors which affect the accuracy.
The fiber used in this study is telluride TZN fiber, thanks to their perfect thermal stability, good optical properties at infrared wavelengths and high magneto-optical property caused by high polarizability of Te4+ ions [9], the TZN fiber is good candidate for MOCT applications.
When the linearly polarized light propagates through the fiber, the birefringence will be induced for mechanical stresses, imperfection of fiber etc.
Careful alignment was carried out to eliminate the alterations in the polarization due to external factors.
During the measurement, there existed many factors which affect the accuracy.
Online since: May 2020
Authors: Ivan Zajačko, Aleksandr Ivanovich Korshunov, Miroslav Císar, T.N. Ivanova
Indicators of wearing identified in the research are including the type and properties of interacting surfaces characterized by the roughness of cutting bit surface, the hardness of materials in contact zone, friction mode that depends on unit pressure, movement rate, the nature of load application, and the rate of interaction of working parts of bit.
The presence of these pressures exerts considerable influence on rock resistance to rupture by rock destruction tool - bit or drilling head and affects drilling technology.
This sufficiently increases the flexural strength of an alloy with toughness growth being equal to 20-30% and shock durability being 10 times larger. [1,5,6] Taking into account the main physical-mechanical properties, medium and coarse-grained alloys with low cobalt content are employed for reinforcement of tools working under conditions of shockless loads, i.e. drilling tools for rotation drilling.
If wear intensity ω is introduced as wear W per unit of work of friction forces AT, , (3) where f – friction coefficient, Р – normal loading, L – friction path. then wear per time unit t0 will be called wear rate а; It was established that wear indices depend on great amount of simultaneously acting factors: type and properties of interacting surfaces (roughness, crookedness, hardness of materials), friction mode (unit pressure, movement rate, the nature of load application and the rate of interaction of working members of bit), type and properties of environment (lubricating and cooling ability). [3, 4] The metal cutting is characteristic by small energy losses due to the friction between the tool and machined material.
Zavialov, Influence of process fluids properties on component surface convective heat emission MEACS 2017 IOP Publishing IOP Conf.
The presence of these pressures exerts considerable influence on rock resistance to rupture by rock destruction tool - bit or drilling head and affects drilling technology.
This sufficiently increases the flexural strength of an alloy with toughness growth being equal to 20-30% and shock durability being 10 times larger. [1,5,6] Taking into account the main physical-mechanical properties, medium and coarse-grained alloys with low cobalt content are employed for reinforcement of tools working under conditions of shockless loads, i.e. drilling tools for rotation drilling.
If wear intensity ω is introduced as wear W per unit of work of friction forces AT, , (3) where f – friction coefficient, Р – normal loading, L – friction path. then wear per time unit t0 will be called wear rate а; It was established that wear indices depend on great amount of simultaneously acting factors: type and properties of interacting surfaces (roughness, crookedness, hardness of materials), friction mode (unit pressure, movement rate, the nature of load application and the rate of interaction of working members of bit), type and properties of environment (lubricating and cooling ability). [3, 4] The metal cutting is characteristic by small energy losses due to the friction between the tool and machined material.
Zavialov, Influence of process fluids properties on component surface convective heat emission MEACS 2017 IOP Publishing IOP Conf.
Online since: October 2014
Authors: Xiang Dong Mei, Yan Hui Liang, Tao Zhang, Zhong Yue Wang, Jun Ning
In the present study, we aimed to assess the properties and bioactivity of CS-PLA polymeric micelles as fungicide carriers.
The chemical structure and physical properties of CS-PLA were characterized.
The thermal properties of CS and CS-PLA were characterized on a Dupont 1090B thermogravimetric analysis apparatus (TGA).
The thermal properties of CS and CS–PLA were assessed using the TGA method.
Moreover, drug LC is another factor to be considered [15].
The chemical structure and physical properties of CS-PLA were characterized.
The thermal properties of CS and CS-PLA were characterized on a Dupont 1090B thermogravimetric analysis apparatus (TGA).
The thermal properties of CS and CS–PLA were assessed using the TGA method.
Moreover, drug LC is another factor to be considered [15].
Online since: September 2023
Authors: Pedro Francisco Mayuet, Lucía Rodríguez-Parada, Álvaro Burgos Pintos, María Alonso Gracía
This aspect is very remarkable in the music sector, as each musician has their own musical preferences depending on the style and type of instrument they use, and in the case of guitarists, there are several factors to take into account [1,2].
In order to understand the vibratory and therefore acoustic behaviour, acoustic studies of guitars are being developed to see the movement of the top as a function of the set-up used and how this affects the acoustics of the guitar.
Modal analysis is fundamental for this, as each mode changes according to the harmonic frequencies associated with each top, and in this case analysing these frequencies with printed PLA material, as the manufacturing factors will modify this response.
Srinivas Prasad, Study of Effects on Mechanical Properties of PLA Filament which is blended with Recycled PLA Materials, IOP Conf.
Basil, Influence of Layer Thickness on Compression Property of 3D- Printed PLA, Al-Muhandis J. 154 (2017) 1–10.
In order to understand the vibratory and therefore acoustic behaviour, acoustic studies of guitars are being developed to see the movement of the top as a function of the set-up used and how this affects the acoustics of the guitar.
Modal analysis is fundamental for this, as each mode changes according to the harmonic frequencies associated with each top, and in this case analysing these frequencies with printed PLA material, as the manufacturing factors will modify this response.
Srinivas Prasad, Study of Effects on Mechanical Properties of PLA Filament which is blended with Recycled PLA Materials, IOP Conf.
Basil, Influence of Layer Thickness on Compression Property of 3D- Printed PLA, Al-Muhandis J. 154 (2017) 1–10.
Online since: July 2012
Authors: Yan Zhang, Zhi Yao Su, Dong Sun, Lu Zhang
Different land use patterns affect soil properties by altering vegetation types, plant roots, and management practices.
Existing findings showed that soil properties changed when forestland transformed into farmland, including the loss of organic matter, the increase of soil bulk density, the reduction of the pH and exchangeable cations [18].
The Abandoned land had experienced strong human disturbances and mechanical disturbances, so it had the lowest SOCD value.
Soil carbon stocks and their influencing factors under native vegetations in china[J].
Research status quo of impact factors of soil carbon storage[J].
Existing findings showed that soil properties changed when forestland transformed into farmland, including the loss of organic matter, the increase of soil bulk density, the reduction of the pH and exchangeable cations [18].
The Abandoned land had experienced strong human disturbances and mechanical disturbances, so it had the lowest SOCD value.
Soil carbon stocks and their influencing factors under native vegetations in china[J].
Research status quo of impact factors of soil carbon storage[J].
Online since: July 2011
Authors: Xin Wang, Zhi Jun Zhang
Simulation of Flow Field and Temperature Tield in the Process of Filling and Solidification for K424 Alloy Thin-walled Casting
Xin Wang 1,a, Zhijun Zhang 2,b
1Academy of Human Sports Science in Shenyang Physical Education Institute, Liaoning Shenyang, China,110102;
2Institute of Mechanical Engineering and Automation in Northeastern University, Liaoning Shenyang, China, 110004;
ashin_wang@163.com, b working_zhang@163.com
Key words: K424 alloy; thin-section casting; flow field simulation; temperature field simulation
Abstract: In order to improve the utilization of K424 alloy, Z-Cast analysis software is used to get three-dimensional flow field and temperature coupling simulation in the process of K424 alloy castings filling, by considering the effection of pouring temperature, casting speed, shell thermal conductivity and temperature on the morphology of filling.
In the process of filling the mold, the molten metal stop flow when filling calculated to 53% ,and the time is0.718s;After the improvement of process program , the flowing front has arched shape only in the beginning moment of filling, then showed a steady advance form, and the temperature gradient is small, the total filling time is 0.863s.Can be seen from the figure of simulation results, the casting process has great impact on the flowing property of the alloy when the shell material is definite.
Although the surface of the liquid metal rise steadily, it will affect the filling effect of thin-wall casting, resulting in the phenomenon of misrun.
The temperature fall nearly 100°C when the down sprue is instinct with liquid metal, and when filled from sprue to casting, the fall of temperature is more than200°C, which close to the solidification temperature, so solidification happened inside the casting before the casting has been filled, this will affect the subsequent inflow of liquid metal and result in the phenomenon of misrun and cold shut.
After improving the casting speed and shuttering temperature, the temperature of liquid metal has not reached liquid line in the end of mold filling, so the solid-phase does not happen in the thin-section casting, and there will not happen the phenomenon of solidification in some parts of the casting to affect the injection of the follow-up liquid metal which result in the defect of misrun.
In the process of filling the mold, the molten metal stop flow when filling calculated to 53% ,and the time is0.718s;After the improvement of process program , the flowing front has arched shape only in the beginning moment of filling, then showed a steady advance form, and the temperature gradient is small, the total filling time is 0.863s.Can be seen from the figure of simulation results, the casting process has great impact on the flowing property of the alloy when the shell material is definite.
Although the surface of the liquid metal rise steadily, it will affect the filling effect of thin-wall casting, resulting in the phenomenon of misrun.
The temperature fall nearly 100°C when the down sprue is instinct with liquid metal, and when filled from sprue to casting, the fall of temperature is more than200°C, which close to the solidification temperature, so solidification happened inside the casting before the casting has been filled, this will affect the subsequent inflow of liquid metal and result in the phenomenon of misrun and cold shut.
After improving the casting speed and shuttering temperature, the temperature of liquid metal has not reached liquid line in the end of mold filling, so the solid-phase does not happen in the thin-section casting, and there will not happen the phenomenon of solidification in some parts of the casting to affect the injection of the follow-up liquid metal which result in the defect of misrun.
Online since: January 2012
Authors: Takayuki Takasugi, Hiroshi Tsuda, Yasuyuki Kaneno, T. Moronaga
Introduction
The single crystal Ni-based superalloys have been widely used for the high temperature structural materials such as gas or jet engine turbine blades to display their highest mechanical performance [1-4].
On the other hand, Ni3X type intermetallic compounds including Ni3Al [5], that are categorized to geometrically close packed (GCP) structure, exhibit high phase and microstructural stabilities up to their melting points because of their low diffusivity, and have very attractive mechanical properties at high temperature.
It was recently shown by the present authors that the two-phase intermetallic alloys composed of Ni3Al and Ni3V (D022 phase) [6-8] improved poor ductility and resulted in superior high temperature mechanical properties to many existing Ni-based superalloys [9].
On the other hand, the specimens with [47] orientation that have the highest Schmid factor in the primary Ni3Al precipitates showed the lowest yield stress at room temperature, as shown in Fig. 1.
Based on this observation, it was demonstrated that the interfaces between primary Ni3Al and the channels (Ni3V) strongly affect the mechanical property (i.e., hardness) and contribute to the strengthening of the two-phase intermetallic alloys.
On the other hand, Ni3X type intermetallic compounds including Ni3Al [5], that are categorized to geometrically close packed (GCP) structure, exhibit high phase and microstructural stabilities up to their melting points because of their low diffusivity, and have very attractive mechanical properties at high temperature.
It was recently shown by the present authors that the two-phase intermetallic alloys composed of Ni3Al and Ni3V (D022 phase) [6-8] improved poor ductility and resulted in superior high temperature mechanical properties to many existing Ni-based superalloys [9].
On the other hand, the specimens with [47] orientation that have the highest Schmid factor in the primary Ni3Al precipitates showed the lowest yield stress at room temperature, as shown in Fig. 1.
Based on this observation, it was demonstrated that the interfaces between primary Ni3Al and the channels (Ni3V) strongly affect the mechanical property (i.e., hardness) and contribute to the strengthening of the two-phase intermetallic alloys.
Online since: February 2013
Authors: Wen Yuan Deng
For the applications of optical coatings in the DUV, especially in the optical lithography, the highest requirement for the performance is pushing the research of nearly all the factors to a new development stage [2, 3].
In DUV or vacuum ultraviolet (VUV), absorption of the ambient appeared, which will affect the measurement accuracy.
For the LaF3 films fabricated by thermal evaporation, the inhomogeneity was one of the main factors that block the optical characterization and the application of it [13].
Optical, structural and mechanical properties of lanthanide trifluoride thin film materials for use in the DUV-spectral region.
Microstructure related properties of lanthanum fluoride films deposited by molybdenum boat evaporation at 193 nm.Thin Solid Films 492, 45–51 (2005)
In DUV or vacuum ultraviolet (VUV), absorption of the ambient appeared, which will affect the measurement accuracy.
For the LaF3 films fabricated by thermal evaporation, the inhomogeneity was one of the main factors that block the optical characterization and the application of it [13].
Optical, structural and mechanical properties of lanthanide trifluoride thin film materials for use in the DUV-spectral region.
Microstructure related properties of lanthanum fluoride films deposited by molybdenum boat evaporation at 193 nm.Thin Solid Films 492, 45–51 (2005)
Online since: September 2017
Authors: W.B. Lee, C.Y. Chan, Li Hua Li
Our proposed design is based on the compound eye function such that the mechanical construction of AWARE2 can be made much simpler and the size can be reduced by almost half.
This will affect the validity and effectiveness of the measurement results.
If the crosstalk seriously affects the imaging quality, then we need to redesign the shape distribution of ESCE.
The optical layout of typical secondary optical elements with general amplification factor is shown in the Fig. 2.
This property enables the system to achieve various applications related to 3D scene geometry, such as synthetic aperture, virtual viewpoint rendering, digital refocusing, and depth-map estimation.
This will affect the validity and effectiveness of the measurement results.
If the crosstalk seriously affects the imaging quality, then we need to redesign the shape distribution of ESCE.
The optical layout of typical secondary optical elements with general amplification factor is shown in the Fig. 2.
This property enables the system to achieve various applications related to 3D scene geometry, such as synthetic aperture, virtual viewpoint rendering, digital refocusing, and depth-map estimation.
Online since: October 2013
Authors: Hui Ling Shen, Peng Cheng Zhou
Polyolefin microporous film was main varieties of many functional polymer, it was made of polyolefin material by deep processing, and it had efficient separation ability of functional film and excellent mechanical properties of plastic film.
LDPE blend film and composite film were prepared by using the blow molding, crystallization behavior of blend films were studied by means of DSC, and selecting data was processed by method of Mo ZS [4] and modified Jeziorny [5], and various factors which had effect on the performance of LDPE blend films were discussed from the microscopic view, which were conducive to application in the field of keeping food fresh for LDPE blend films.
On the other hand, DE was dispersiveness distribution in matrix, which affected the continuity of the matrix resin and made molecular distance of the material increase, thus increasing the moisture permeability of LDPE composite film.
LDPE blend film and composite film were prepared by using the blow molding, crystallization behavior of blend films were studied by means of DSC, and selecting data was processed by method of Mo ZS [4] and modified Jeziorny [5], and various factors which had effect on the performance of LDPE blend films were discussed from the microscopic view, which were conducive to application in the field of keeping food fresh for LDPE blend films.
On the other hand, DE was dispersiveness distribution in matrix, which affected the continuity of the matrix resin and made molecular distance of the material increase, thus increasing the moisture permeability of LDPE composite film.