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Online since: January 2011
Authors: Jian Gang Shi, Kun Shi
From the ancient structure of beams and columns to the present steel structure, building frame support the structure space and mechanical load for the construction.
Nucleus is the basis of cell proliferation, gene regulation and genetic stability, while the bedroom is the core of real estate model, directly affecting people's living, studying and working.
Everyone in society is independent and unique individual, with particle property of electron.
Both of them represent the energy factors: life events are associated with the flow of energy and matter which a nerve impulse along with neurotransmitter release and membrane potential change, body temperature maintaining with of a series of physiological changes accompanied by mitochondrial respiration, ATP hydrolysis and energy release; in a stable society, human work, relax and rest in proper places and the city operates normally without violence, disorder and chaos, which are the symbols of energy out of control.
Online since: April 2014
Authors: Shao Hua Xu, Li Zeng
It has the features of high mechanical integration, electrical motor construction materials and higher efficiency of drive system components.
In the mechanical system with Multi-Degree-of-Freedom movement, a Multi-Degree-of-Freedom motor can replace two or more Single-Degree of Freedom motor, which greatly simplifies the structure of mechanical systems, reduces size and weight, and eliminates the disadvantages such as free play and friction the gear drive brought etc.
In the Multi-Degree-of-Freedom device used for driving high-speed and super speed, there are mechanical (bearing) supporting wear problems.
The function of bearing significantly affects the reliability of the motor and the utilization ratio of equipment.
Collected Papers of Japanese Mechanical Society(C Edition), 63.612, (1997-8), p: 2707—2713
Online since: May 2022
Authors: Rong Jian Pan, Fan Yang, Zhen Wang, Hai Sheng Zhang
., but fast neutron irradiation induced brittleness is the most important factor [5-11].
And then, optical microscope (OM) is used to analyze the microstructure of the specimen with cleavage fracture, and the analysis results are compared with those of the specimen without cleavage fracture, determining the main factors causing the cleavage fracture of the specimen.
Irradiation property of pressure vessel materials in China, Materials China, 05 (2011) 7-10.
Liu, et al., Influence factors of nuclear power plant reactor pressure vessel on irradiation embirttlement, China Metallurgy, 24 (2014) 1-5.
Chen, Effects of specimen sizes on the local cleavagefracture stress of steel, Journal of Mechanical Strength, 25 (2003) 552-555.
Online since: March 2008
Authors: Jiří Čermák, Ivo Stloukal, Lubomir Král, B. David
Somewhat more detailed information on the H location can be found in [33]: A square planar order of H atoms in the complex implies metallic properties, whereas regular tetrahedron leads to semiconductor-like character of the compound (for step-like changes of electric conductivity - see also in [30]).
Pressure of hydrogen, p, is understood as a factor that affects the kinetics of the C/D processes.
Hence, it seems that the pressure does not affect significantly the desorption kinetics in the present case.
Another principal factor influencing the reliability of obtained values of D is a proper choice of the particle size, ρ.
Considering both the factors, the typical experimental error was estimated and shown in Fig. 22 as an abscissa.
Online since: July 2015
Authors: Mohamed Antar
Water Desalination Using Solar Energy Mohamed Antar Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran-31261, Saudi Arabia.
Solar radiation flux, wind speed, lower ambient temperature and water depth were the main parameters that affect the performance of the solar still.
Factors affecting solar still efficiency were analyzed by Cooper [42] who showed the upper limit of a solar still efficiency theoretically and experimentally.
It should be noted that the solution of the above coupled (heat and mass transfer) equations are very sensitive to various thermo-physical properties, the present solution procedure was based on variable properties (cP, µ, α, r, k, hfg, Pw, Pg…etc.) that are updated once any value of the temperatures is calculated.
The whole process efficiency is also affected by conduction heat loss through the membrane itself.
Online since: January 2012
Authors: Li Zeng, Dan Zhang, Jun Wang
It has the features of high mechanical integration, electrical motor construction materials and higher efficiency of drive system components.
In the mechanical system with Multi-Degree-of-Freedom movement, a Multi-Degree-of-Freedom motor can replace two or more Single-Degree of Freedom motor, which greatly simplifies the structure of mechanical systems, reduces size and weight, and eliminates the disadvantages such as free play and friction the gear drive brought etc.
In the Multi-Degree-of-Freedom device used for driving high-speed and super speed, there are mechanical (bearing) supporting wear problems.
The function of bearing significantly affects the reliability of the motor and the utilization ratio of equipment.
Collected Papers of Japanese Mechanical Society(C Edition), 63.612, (1997-8), p: 2707—2713
Online since: December 2015
Authors: Amar S. Bhalla, Ru Yan Guo, Christopher G. Pierce, Jose L. Lopez-Ribot, Melissa Montes
Many of the fascinating nanomaterials properties are influenced by surface phenomena; therefore, this work intends to understand and eventually compare surface properties, such as surface energy, surface plasmon resonance and surface charge, of silver and copper nanoparticle containing aqueous suspensions, and to correlate these properties with their efficacy against fungal (C. albicans) and bacterial (S. aureus) biofilms.
Materials and Methods Physical properties.
Several characterization approaches were used to collect details of the physical properties of Ag and Cu colloidal water.
Cao, Nanostructures and Nanomaterials: Synthesis, Properties, and Applications, Imperial College Press, London, UK, 2004
Zhang, Optical Properties and Spectroscopy of Nanomaterials, World Scientific Publishing Co, United States of America, 2009
Online since: July 2018
Authors: Melanie Klein, Rolf Steinhilper, Leonhard Finsterwald, Kathrin Tonhaeuser
The measurement analysis of the different energy consumers of the autoclave at changing the curing parameters (temperature, pressure, time) shows how the settings affect the resource efficiency of curing processes.
Successful curing of CFRP depends on material properties, which are appreciated by the manufacturers.
By appropriate fiber orientation, the anisotropic mechanical properties of the fibers can be used, which has a positive effect on the component strength [7, 8].
The decisive factor is the temperature difference between the ambient and the curing temperature.
Online since: October 2010
Authors: Dun Fang Li, Cheng Yan Wang, Fei Yin, Yong Qiang Chen, Quan Ming Liu, Xiao Wu Jie
Introduction With a wide direct band gap of 3.33eV at room temperature and a hexagonal wurtzite structure, Zinc oxide (ZnO) as the II-VI semiconductor material exhibits semiconducting, piezoelectric, pyroelectric and mechanical multiple properties, which has potential applications in many fields, such as optoelectronics, photovoltaics, catalysts, solar cells and composite materials.
The special structural character of T-ZnO may have special physical properties and interesting benefits in composite materials.
The key factors that affect the T-ZnO morphologies seem to be the oxidation conditions of zinc vapor and the nucleation of T-ZnO at elevated temperature other than the starting materials.
Online since: February 2018
Authors: Wei Min Chen, Li Jun Zhang
Introduction Due to their excellent high–temperature mechanical properties and high resistance to creep and fatigue at elevated temperatures, Ni–based superalloys have been widely used in both aviation and land–based gas turbine environments [1–3].
Compared with the conventional diffusion couple technique, diffusion multiple technique developed by Zhao et al. [11, 12] can provide much more composition profiles at a given temperature, which can be adopted for the high–throughput measurements of phase diagrams and materials properties (i.e., diffusion kinetics, thermal conductivity and hardness, and elastic modulus).
The parameter A0 is a factor depending only on crystal structure [23].
The thermodynamic factor Ф is expressed by, (3) where the chemical potential μi can be obtained from the corresponding thermodynamic descriptions.
In addition, both cross interdiffusivities and are also mainly affected by the content of component Al.
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