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Online since: June 2011
Authors: Wei Wang, Yuan Jun Guo, Zhi Hai Zhang, Zhi Yu Wen
The SNR can be increased by the factor of 3.5, which is identical with the theoretic result.
Although HTS that use mechanical movement templates can solve the problem of luminous flux and SNR, but the whole system is very complex due to its stepper motor, and mechanical movement can bring larger error.
Therefore, traditional mechanical templates and poor switching characteristics of LC modulator impose restrictions on HTS development [9].
Experimental results show that SNR can be increased by a factor of 3.5, in a good agreement with the theoretical result 3.9.
Though, unstable signal will affect the Hadamard multiplex, but for a particular mirror number, SNR compensation can be made by several times scan average or filter circuit improvement.
Although HTS that use mechanical movement templates can solve the problem of luminous flux and SNR, but the whole system is very complex due to its stepper motor, and mechanical movement can bring larger error.
Therefore, traditional mechanical templates and poor switching characteristics of LC modulator impose restrictions on HTS development [9].
Experimental results show that SNR can be increased by a factor of 3.5, in a good agreement with the theoretical result 3.9.
Though, unstable signal will affect the Hadamard multiplex, but for a particular mirror number, SNR compensation can be made by several times scan average or filter circuit improvement.
Different Approaches to Determine of the Explosion Effect, of a Homemade Explosive, on the Structure
Online since: October 2015
Authors: Lucia Figuli, Zuzana Zvaková
a)
b)
c)
Fig.8 Bridge pillar: a) real structure b) dimensions c) SDOF model
Mechanical properties.
In general, loading at high rates causes a strengthening effect, but at the same time material becomes more brittle. [4] The material properties, especially yield stress, under blast loading gain values that are remarkably higher than the static compressive or tensile strength.
Dynamic increase factors for design of reinforced concrete elements depend on the type of stress.
Table 1 Equivalent SDOF factors for cantilever beam Loading diagram Strain range Load factor KL Mass factor KM Load-Mass Factor KLM Spring constant uniform elastic 0.40 0.26 0.656 To make the SDOF system response equivalent to that of the real system, equivalent SDOF factors are used to obtain the effective mass, force, and resistance terms [5].
It depends on the various factors.
In general, loading at high rates causes a strengthening effect, but at the same time material becomes more brittle. [4] The material properties, especially yield stress, under blast loading gain values that are remarkably higher than the static compressive or tensile strength.
Dynamic increase factors for design of reinforced concrete elements depend on the type of stress.
Table 1 Equivalent SDOF factors for cantilever beam Loading diagram Strain range Load factor KL Mass factor KM Load-Mass Factor KLM Spring constant uniform elastic 0.40 0.26 0.656 To make the SDOF system response equivalent to that of the real system, equivalent SDOF factors are used to obtain the effective mass, force, and resistance terms [5].
It depends on the various factors.
Online since: October 2011
Authors: Wei Guo, Tong Yang, Yi Wang, Hong Xu
This article discusses the concept and characteristics of environmental protection equipment industry, present situation of environmental protection equipment industry development and factors restrict the development of China's environmental protection equipment industry, in the end, some suggestions will be made for the environmental protection equipment industry.
However, environmental protection equipment is not only put into use these principles, but also combines other related disciplines, professional technology and knowledge such as mechanical design and manufacturing, mechanical technology, computer science and technology, mathematics, biology technology and new energy, acoustics, optics, monitoring and so on[3].
III. analysis of factors restricting the development of china's environmental protection equipment industry A.
Third, the degree of automation still low, which to some extent affected the productivity and the profitability of environmental protection equipment business.
Insufficient investment in China's environmental protection equipment industry is one of the factors restricting the development of the industry, and only by constantly increasing input can ensure the development of the environmental protection equipment industry.
However, environmental protection equipment is not only put into use these principles, but also combines other related disciplines, professional technology and knowledge such as mechanical design and manufacturing, mechanical technology, computer science and technology, mathematics, biology technology and new energy, acoustics, optics, monitoring and so on[3].
III. analysis of factors restricting the development of china's environmental protection equipment industry A.
Third, the degree of automation still low, which to some extent affected the productivity and the profitability of environmental protection equipment business.
Insufficient investment in China's environmental protection equipment industry is one of the factors restricting the development of the industry, and only by constantly increasing input can ensure the development of the environmental protection equipment industry.
Online since: November 2013
Authors: Stefan Cristea, A. Groseanu, A. Prundeanu, D. Gartonea, S. Dragosloveanu
Osteoporosis is a common disease of elderly patients, mainly affecting women over the age of 65, and it is associated with a high morbidity, mortality and a significant escalating socio-economic problem [1].
Hip fracture: risk factors and outcomes.
Factors associated with short-versus long-term skilled nursing facility placement among community-living hip fracture patients.
Gasser B, Heini P.E Femoroplasty – augmentation of the proximal femur with composite bone cement - feasibility, biomechanical properties and osteosynthesis potential.
Femoroplasty-augmentation of mechanical properties in the osteoporotic proximal femur: a biomechanical investigation of PMMA reinforcement in cadaver bones.
Hip fracture: risk factors and outcomes.
Factors associated with short-versus long-term skilled nursing facility placement among community-living hip fracture patients.
Gasser B, Heini P.E Femoroplasty – augmentation of the proximal femur with composite bone cement - feasibility, biomechanical properties and osteosynthesis potential.
Femoroplasty-augmentation of mechanical properties in the osteoporotic proximal femur: a biomechanical investigation of PMMA reinforcement in cadaver bones.
Online since: July 2019
Authors: Wassana Wichai, Niwat Anuwongnukroh, Surachai Dechkunakorn, Panya Sunintaboon, Kanin Nimcharoensuk, Vanthana Sattabanasuk
Reducing the frequency of bond failures should be a primary objective for the orthodontist, since replacing loose brackets is inefficient, time-consuming, and costly.[2] Bond strength can be influenced by various factors such as source of curing, type of enamel conditioner, acid concentration, etching time, composition of adhesive, bracket base design, and bracket material.[3-5]
Almost all of the conventional light-cured orthodontic adhesives used in Thailand are imported from foreign countries.
However, the best mechanical properties could be achieved by incorporating high concentrations of filler particles of “various sizes” into the resin.[15] From manufacturer’s safety data sheet, Transbond XT contains silane-treated quartz (70-80 wt%) and silane-treated silica (<2 wt%).
Various factors, such as saliva contamination and patient’s enamel composition, can cause the different results when performed intraorally.[11] Moreover, the nature of forces on brackets in vivo and the nature of the stress distribution generated within adhesive is complex and likely to combine shear, tensile, and compressive force systems.
Effect of the amount of 3-methacyloxypropyltrimethoxysilane coupling agent on physical properties of dental resin nanocomposites.
Variables affecting the fracture toughness of dental composites.
However, the best mechanical properties could be achieved by incorporating high concentrations of filler particles of “various sizes” into the resin.[15] From manufacturer’s safety data sheet, Transbond XT contains silane-treated quartz (70-80 wt%) and silane-treated silica (<2 wt%).
Various factors, such as saliva contamination and patient’s enamel composition, can cause the different results when performed intraorally.[11] Moreover, the nature of forces on brackets in vivo and the nature of the stress distribution generated within adhesive is complex and likely to combine shear, tensile, and compressive force systems.
Effect of the amount of 3-methacyloxypropyltrimethoxysilane coupling agent on physical properties of dental resin nanocomposites.
Variables affecting the fracture toughness of dental composites.
Online since: December 2009
Authors: Abul Fazal M. Arif, S.S. Akhtar, A.K. Sheikh
Apart from other factors such as die design and manufacturing, heat treatment, working
conditions etc, performance of hot extrusion die can directly be related to the billet quality used in
the extrusion press.
Introduction The extrusions of 6063 aluminium alloys are widely used because of the alloy's good extrudability and mechanical properties.
This leads to greater uniformity of flow stress and final properties of the extrusion and allows the development of full mechanical properties [1].
Use of high-quality extrusion billet with predictable and controllable microstructure and mechanical properties is essential for any competitive extrusion industry.
With a supply of high-quality billet with customized microstructures and consistent mechanical properties, the extruder can operate presses at maximum efficiency and minimum cost.
Introduction The extrusions of 6063 aluminium alloys are widely used because of the alloy's good extrudability and mechanical properties.
This leads to greater uniformity of flow stress and final properties of the extrusion and allows the development of full mechanical properties [1].
Use of high-quality extrusion billet with predictable and controllable microstructure and mechanical properties is essential for any competitive extrusion industry.
With a supply of high-quality billet with customized microstructures and consistent mechanical properties, the extruder can operate presses at maximum efficiency and minimum cost.
Online since: February 2026
Authors: Serhii Bobyr, Ihor Chuiko, Eduard Parusov, Eduard Oliinyk, Viktor Zhukov
The most critical factor affecting the stability of subsequent cold deformation of wire rod is the presence of martensite in the metal structure, as mechanical stresses are localized around it during drawing, leading to the formation of microcracks in the ferrite matrix, which may potentially result in the development of a main crack and wire failure.
Acknowledgement This material was created with the support of the project “Establishing the features of the formation of the structural state and properties of rolled steel from alloyed Cr-Mo-V steels to increase its deformability in the production of welding materials” (state registration number of the research work: 0125U000021).
Microstructure and Properties, Elsevier, Amsterdam, 2006. 344 p
Grigorenko, Increase of mechanical properties of weld metal of high-strength low-alloy steels, Springer Proceedings in Physics. (2020), Vol. 240, P. 307–315. https://doi.org/10.1007/978-981-15-1742-6_29
Seto, Effects of partitioning of manganese and silicon during intercritical annealing on transformation behavior and mechanical properties of low alloyed TRIP-assisted steel sheets, ISIJ International. (2017), Vol. 57(2), P. 380–387. http://dx.doi.org/10.2355/isijinternational.ISIJINT-2016-288
Acknowledgement This material was created with the support of the project “Establishing the features of the formation of the structural state and properties of rolled steel from alloyed Cr-Mo-V steels to increase its deformability in the production of welding materials” (state registration number of the research work: 0125U000021).
Microstructure and Properties, Elsevier, Amsterdam, 2006. 344 p
Grigorenko, Increase of mechanical properties of weld metal of high-strength low-alloy steels, Springer Proceedings in Physics. (2020), Vol. 240, P. 307–315. https://doi.org/10.1007/978-981-15-1742-6_29
Seto, Effects of partitioning of manganese and silicon during intercritical annealing on transformation behavior and mechanical properties of low alloyed TRIP-assisted steel sheets, ISIJ International. (2017), Vol. 57(2), P. 380–387. http://dx.doi.org/10.2355/isijinternational.ISIJINT-2016-288
Online since: May 2020
Authors: А.Yu. Stolboushkin, O.A. Fomina
It has been shown the characteristic of ceramic-technological properties of raw materials.
It has been established the change dependence in the physicomechanical properties of cellular ceramic samples on the temperature and firing duration.
The firing temperature affects on the shape and size of the pores.
As a result, oblong pore-cells are formed with a shape factor of 2–3 or more.
Features of manufacture and its properties.
It has been established the change dependence in the physicomechanical properties of cellular ceramic samples on the temperature and firing duration.
The firing temperature affects on the shape and size of the pores.
As a result, oblong pore-cells are formed with a shape factor of 2–3 or more.
Features of manufacture and its properties.
Online since: March 2012
Authors: Ping Jin, De Wang, Xiao Ming Tan
Hygrothermal behavior is an important factor need to be considered in the whole environment, and it is also the problem that all the composite materials must face.
In general terms, with properties being sensitive to the condition of environment, interlaminar shear and flexural properties are generally more sensitive to moisture than tensile properties, especially in high temperature[9].
As an important micro-structure, the performance of fiber-matrix interface affects the whole performance of composite materials directly[15].
(2) Mechanical hinge: This is produced by crack and roughness of the skin-face
References [1] Sun Tao: The influence of Pore on the Mechanical properties of CFRP on Hygrothermal Environment (Harbin engineering university, Harbin 2010), in Chinese
In general terms, with properties being sensitive to the condition of environment, interlaminar shear and flexural properties are generally more sensitive to moisture than tensile properties, especially in high temperature[9].
As an important micro-structure, the performance of fiber-matrix interface affects the whole performance of composite materials directly[15].
(2) Mechanical hinge: This is produced by crack and roughness of the skin-face
References [1] Sun Tao: The influence of Pore on the Mechanical properties of CFRP on Hygrothermal Environment (Harbin engineering university, Harbin 2010), in Chinese
Online since: March 2008
Authors: Xing Min Chang, Qiong Deng, Chun Lin Chen, Tao Suo, Yu Long Li
Deng)
Key words: Hopkinson Pressure Bar, initiator, shock-resistibility, high acceleration
Abstract: This paper attempted to study the properties of Slapper detonator non-energetic elements
through exerting impact on them by Hopkinson Pressure Bar and evaluating the acceleration that
samples received in accordance with one-dimensional stress wave theory.
And it has become the main device of calibrating high shock acceleration sensors and testing the material's dynamic properties [1-5].
To produce the sine pulse, two main factors have to be taken into consideration: pulse shaper and strike bar.
Table1 Relationship among the inflated pressure, velocity and acceleration amplitude Length of strike bar / mm Air pressure / MPa velocity / [m·s -1] Pulse duration / µs Acceleration amplitude /104g 126 0.18 29.4 58 24 190 0.17 27.3 91 13.3 270 0.17 25.5 130 7.4 460 0.17 18.7 160 7.2 As shown in Table 1, experiments on strike bars of different length may affect the velocity of strike bar, acceleration pulse duration and the acceleration amplitude causing the destruction.
The mechanical response of an A359/SiCp MMC and the A359 aluminum matrix to dynamic shearing deformations.
And it has become the main device of calibrating high shock acceleration sensors and testing the material's dynamic properties [1-5].
To produce the sine pulse, two main factors have to be taken into consideration: pulse shaper and strike bar.
Table1 Relationship among the inflated pressure, velocity and acceleration amplitude Length of strike bar / mm Air pressure / MPa velocity / [m·s -1] Pulse duration / µs Acceleration amplitude /104g 126 0.18 29.4 58 24 190 0.17 27.3 91 13.3 270 0.17 25.5 130 7.4 460 0.17 18.7 160 7.2 As shown in Table 1, experiments on strike bars of different length may affect the velocity of strike bar, acceleration pulse duration and the acceleration amplitude causing the destruction.
The mechanical response of an A359/SiCp MMC and the A359 aluminum matrix to dynamic shearing deformations.