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Online since: August 2012
Authors: Jian Guo Ding, Zhi Qiao
At present, the research achievements for the destroyed mechanism and mechanical model of the structure for this new-style multi-layer frame-bent industrial building under the action of earthquake are seldom at home and abroad.
It uses a simplified mechanical model instead of the original structure.
So that, we can obtain the participation factor of each vibration pattern
Notes: The numbers in the figure represent the location of the property hinges and the values represent the sequence of plastic hinges Fig.6 The location and order of plastic hinges of each rod bent From Fig.6 , we can get that each lumped mass points of the left span of the second layer of the structure yielded and the plastic hinges appeared in turn.
(5) From the deformation and internal forces of the new multi-storey frame structure in several different seismic waves, we can conclude that seismic waves significantly affect the seismic performance of the structure.
Online since: July 2013
Authors: Jilt Sietsma
Various features of the microstructure play a determining role for the (mechanical) properties [1,2], like the volume fractions of phases, grain-size distributions, composition and composition gradients, stability of meta-stable phases, continuity of phases, crystallographic texture, deformation defects, etc.
The balance between strength and ductility in mechanical properties is well controlled and third-generation high-strength steels, which are presently in development, are aimed to bring the combinations of strength and ductility for low-alloy steels to a higher level in the range of strength up to 1500 MPa and ductility up to 50% (see figure 1 [3]).
In ref. [61] also 3D Phase-Field simulations have been presented, with similar agreement with experiments, of which the resulting microstructures were used as input for Finite-Element modelling of mechanical properties.
The strength of such models is that microstructural processes can be identified that are experimentally very difficultly accessible (like the carbon enrichment of ferrite in figure 9) and that a direct link can be made with (Finite-Element) models to simulate the mechanical properties.
This link, although not discussed in this paper, completes the crucial sequence processing-microstructure-properties.
Online since: December 2013
Authors: Majedul Islam, M. A. Karim, Suvash C. Saha, Sarah Miller, Prasad K. D. V. Yarlagadda
Required values in the equations are daily normal insolation, and the spectral selective properties of the collector components.
Dudley et al. [1] have published detailed collector geometry, surface optical properties and performance data under conditions slightly different to those used in SEGS plants.
Table 1 Spectral selectivity of LS2 collector components Collector components Selective properties Forristall [6] Trough mirror r 0.9337 Glass envelop t 0.935 r 0.045 a 0.02 Cermet coating a 0.92 Black chrome coating a 0.94 Number of rays and grid checking.
Furthermore, the coincidence of all graphs implies that, the LCR is directly proportional to the DNI and the spectral selective properties of the collector components.
Local irradiance is expressed as a direct function of the receiver angular location in the equations, in which daily normal insolation, and the spectral selective properties of the collector components are the required input parameters.
Online since: February 2014
Authors: Hua Ling Chen, Yong Quan Wang, Jing Yuan Wang
Introduction Flow cytometry is a mature technique for the quick measurement of physical and/or chemical properties of particles (usually cells) in a fluid stream, and has been used in the fields of biomedical research and clinical diagnostics for years.
The simulation results demonstrate that under the appropriate scale and motion conditions, the introduced feature steps have no substantial impact on flowing properties of the micro fluids.
Due to some inevitable human and random factors in the operating processes, the two groups of horizontal focusing images are not completely the same.
By observing and comparing these images, we can intuitively see the devices’ 3D focusing properties, as well as the influence of the step height on their performances.
[18] Wang Y, Wang J, Chen H, Zhu Z, and Wang B, Prototype of a novel micro-machined cytometer and its 3D hydrodynamic focusing properties, Microsyst.
Online since: March 2015
Authors: Jia Qiang Wei, Xiao Long, Ke Cheng Liu, Hong Shan Zhang
Study of Screening Reverse Osmosis Menmbrane Anti-scaltants by Drainage Gradient Method Hongshan Zhang1,a, Jiaqiang Wei2,b, Kecheng Liu3,c, Xiao Long3,d 1Hebei Electric Power Design & Research Institute, Shijiazhuang, 050031,China 2 School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072,China 3 State Grid Hebei Electric Power Research Institute, Shijiazhuang, 050021,China aemail: jjzhsh@126.com, bemail: weijiaqiang20085@163.com, cemail: hbdyylkc@163.com, demail: 13832168901@126.com Keywords: Drainage gradient Reverse osmosis Anti-scaltants Evaluation method introduction Abstract.
If the solubility limits of a sparingly soluble salt is exceeded, scale precipitation will clog the membrane and affect the operation of RO system.
The two factors add up to plots of pH~KCl as shown in Fig.5.
Xiang, Property evaluation of polyepoxysuccinic acid with conductometric titration method,Therm.
Online since: October 2023
Authors: Cheng Zhou, You Zhou, Dong Po Xuan, Tian Liang Jiang, Li Peng, Wen Hao Fan
One of the main factors that influence the industrialization of TRC to cast steel is the strip quality and the process stability [4, 6].
In the process of TRC, the molten steel level affects the heat transfer process between the molten steel and the rolls, and then the solidification process of the molten steel.
Due to the radiation leakage caused by radiation penetration that can affect the human body, it is rarely used in production environments with human participation.
Hirt, Twin-roll strip casting: a competitive alternative for the production of high-manganese steels with advanced mechanical properties, Mater.
Online since: June 2023
Authors: Tribikram Gupta, S. Vaijayanthimala, N. Rajeswari Yogamalar, Kalpana Sharma, Vinayak Adimule
The performance is driven not just by the specific surface area (SSA) but two additional factors, namely the pore size and the geometry of the carbon nanostructure.
This affects the power output adversely.
Table 1 shows the electrochemical properties of some recently used MOF-based materials.
This has to be achieved without compromising on the core electrochemical properties.
“Influence of Nano Particles on Optical Properties of Cu-MOFs.”
Online since: April 2014
Authors: Fabian Schongen, Fritz Klocke, Daniel Heinen, Kristian Arntz, Yuan Liu, Vladimir Bäcker, Björn Feldhaus
The objective of a laser surface treatment is to modify the material properties that the result is a high toughness of the base material and a high surface hardness.
The most common deposition processes in production for enhancing the surface properties of highly stressed parts are shown in Figure 2.
So unintentional alloys between base and additive material with insufficient properties are avoided.
This means, properties of the laser treated surface of the part depend on solidification conditions [15].
Tool steels – deciding factor in worldwide production.
Online since: October 2023
Authors: Woelandari Fathonah, Zulmahdi Darwis, Lukmanul Hakim
The purpose of this addition is to ascertain how the addition of steel slag will affect the compressive strength of fly ash concrete.
However, it was shown that between 30 and 60% of the coarse aggregate should be replaced with steel slag for the best mechanical qualities (compressive strength, tensile strength, and flexural strength) compared to traditional concrete.
This condition can be caused by several factors, namely the fact that the dimensions of the test object are not precise, the mixture is uneven, and porosity occurs.[14] whereas for presentations, 80% and 100% have a decrease from normal concrete due to an unfavorable crushing mode and have such a large slam value compared to other concrete.
This greatly affects the quality of the concrete because the inaccurate surface on the concrete sample causes uneven loading when the concrete compressive strength test is carried out.
Xiang, “Numerical Simulation of Basic Properties of Full-Steel Slag Aggregate Concrete,” Adv.
Online since: May 2023
Authors: Dr. Elhadi Zoubai, Bachir Bouhamida
The Effect of Elliptical Form of Cylinder on Free Convection in Annular Space Elhadi Zoubai1,a* and Bachir Bouhamida1,b Laboratory of LSCMI, Faculty of Mechanical Engineering, USTO-MB, BP 1505, El-Menaouer, Oran, 31000, Algeria ahadi_usto@yahoo.fr, bbouhamida68b@yahoo.fr Keywords: Free convection, thermal science, Newtonian fluid, steady simulation, CFD Abstract.
The space between cylinders is considered to be filled with fluid of different values of thermo-physical properties (Pr).
It was understood that the number of cylinder, the form of cylinder and the kind of the fluid are principal factors that can improve or reduce the heat transfer.
Fig. 2 Mesh for present domain The number of grid elements greatly affects the calculations results, so choosing this number is very important in numerical work.
Through the results, we were able to extrapolate the following points: · The elliptical shape the cylinder effectively affects on heat transfer; · The heat transfer decreases as the aspect ratio increases; · For all considered values of aspect ratio (E), increase in the force of thermal buoyancy (Ra) increases the thermal transfer rate; · The effect of Pr number on the studied geometries is very small
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