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Online since: May 2013
Authors: Josephine Ying Chyi Liew, Zainal Abidin Talib, Mat Yunus Wan Mahmood, Zulkarnain Zainal
Wernick, Ternary chalcopyrite semiconductors: growth, electronic properties and applications, Pergamon, Oxford, 1975
Samanta, On some properties of I2-IV-VI3 compounds, Phys.
Nieves, On the temperature dependence of the electrical and optical properties of Cu2GeSe3, J.
Morelli, Thermoelectric properties of the Cu2SnSe3-Cu2GeSe3 solid solution, J.
Ramanathaswamy, Preparation and study of structural and optical properties of CSVT deposited CuInSe2 thin films, Sol.
Online since: February 2025
Authors: Chawki Lahoud, Jihad Rishmany, Rodrigue Imad, Michel Daaboul
Key physical properties of Erythritol and Therminol55 are summarized in Table 3.
Thermo-physical properties of selected PCM and HTF at different operating temperatures. [33-35,38,39].
Physical properties of these materials are summarized in table 6.
Physical properties of carbon steel, FRP and rockwool. [43,44] Material Thermal conductivity (W/m.
Kaizawa, A Kawai, H Kamano, T Jozuka, T Senda, T Akiyama, Thermophysical and heat transfer properties of phase change material candidate for waste heat transportation system.
Online since: November 2012
Authors: Byung Sik Chun, Eric Yee, Jongh Wi Lee, Dae Sung Lim
However, chemical additives and ion-exchange can affect water chemistry.
This mechanical technique sprays high pressure water onto pipe wall deposits, which loosens, shears, and drains away the unwanted materials [34-35].
The differences in mass between the pipes angled at 2° and 5° suggest that flow is a significant factor in calcium carbonate deposition, with lower gradients being able to develop more scale.
Table 3 lists some properties for calcite, aragonite, and vaterite.
Properties of calcium carbonate polymorphs.
Online since: December 2016
Authors: Marie Rusinová, Jiří Šlanhof
Five limit states (i.e. characteristic properties [5]) are distinguished, these being the load-bearing capacity of the structure R (t), the structural integrity E (t), the thermal insulation I (t), the density of thermal flow W (t) and the smoke resistance of the structure S.
The characteristic properties of the structure must be maintained for the required period of fire resistance.
The fire height of the building and its influence on the possibility of using other structural systems than a non-flammable one need to be examined in greater detail, as both of these factors will further influence the selection of the type of escape route to build.
Materials for Technical and Financial Evaluation Fire safety has an important influence on the building designs of investors as it affects technical solutions which are part of the design documentation of buildings.
The most important factor for the evaluation is the budgeted price; the weight and the time required for realization are other factors.
Online since: July 2015
Authors: Günter Gottstein, Lazar S. Shvindlerman
This owes mainly to the fact that their study entails the observation of complex dynamic phenomena, like recrystallization or grain growth, where the motion of grain boundaries is influenced by a multitude of factors that complicate the association of its fundamental dependences with microstructural features [5, 6, 12-16].
While grain boundary thermodynamics and kinetics have been addressed frequently in the past, very little is known of the properties of grain-boundary junctions.
These examples demonstrate that grain boundary triple lines have properties distinct from those of the connected grain boundaries.
Hertz considered the geometrical and mechanical behaviour of two spherical bodies under a load.
This factor may be a reason for the abnormal stability of small voids in nanocrystalline materials.
Online since: May 2014
Authors: Arnold Nicolaus, Horst Bettin, Michael Borys, Ulrich Kuetgens, Axel Pramann
In the following the ‘mechanical way’ to the kg is described, the precise determination of the Avogadro constant, NA.
From this crystal, single parts spread along the length of the crystal were used for the analysis of the crystal properties and homogeneity.
Additionally, a novel determination of calibration factors K used to correct the measured ratios for mass bias effects has been applied. 28Si crystal samples of parts of the original float-zone crystal located around the two spheres were investigated with respect to the molar mass.
Self-heating of the Pt-25 thermometer cannot affect the temperature of the sphere.
Secondly the experimental properties are assorted, e.g. temperature of the sphere and phase correction due to the surface layers.
Online since: September 2005
Authors: Stefan Kaczmarczyk
This results in excessive friction wear which in turn affects the integrity of the suspension system and reduces the safe service life of the installation.
car + load diverting pulley compensating ropes counterweight traction sheave travelling cables factor 2:1 suspension ropes reeving L(t) Lcw(t) M(t) Mcw(t) w (t)0 w w V m x x V Fig. 1.
Structural Integrity and Vibration Suppression of Elevator Ropes The structural integrity of elevator suspension ropes decreases during their lifespan and properties of both steel wire and polymeric ropes change during their service.
The adverse resonance behaviour affects the structural integrity of the suspension system causing fatigue breaks of wires in steel ropes and destructive self abrading and repetitive compressive loads of fibres in aramid ropes.
Janovsky: Elevator Mechanical Design (Elevator World Inc., Mobile U.S. 1999)
Online since: July 2016
Authors: Oana Dodun, Margareta Coteaţă, Laurenţiu Slătineanu, Irina Beşliu, Gheorghe Nagit
The results of the experimental research proved that temperature and viscosity of the polymer found in liquid state are able to strongly affect the bubbles release and maintenance of wall thickness in thick-walled moldings.
They appreciated that the model proposed by Bellehumeur could be modified by considering a geometric factor.
Obtaining a layer of minimum thickness adhered to the internal surface of the mold, as a consequence of the mold rotation around a horizontal axis Sarrabi et al. [4] presented the results of a mechanical properties simulation process of rotomolded parts by considering the material microstructure, in the case of using the crystallization kinetics.
The above mentioned aspects ensure also the positioning of the mold at a certain distance r from the rotation axis and changing thus, between some limits, the rotation speed and the centrifugal force able to affect the flow of the liquid material in the mold cavity.
Online since: October 2021
Authors: Deepak K. Prajaapti
Prajapati1 Independent Researcher, Fatehpur, Uttar Pradesh, 212664, India 1Deepak K Prajapati is presently doing his Post-Doc from the Department of Mechanical Engineering, IIT, Delhi, India Email: deepak2019iitp@gmail.com Keywords: surface topography; correlation length; asperity radius; contact pressure; real area of contact Abstract.
Introduction Friction and wear are extrinsic properties of systems which are governed by asperity interactions.
During pure sliding or rolling /sliding motion, friction changes abruptly, however, it is also true that friction and wear are significantly affected by initial surface topography.
Later on, in Sec. 3 it is demonstrated that how different correlation lengths of measured rough surfaces affect the surface topography during wear.
This happens due to dependency of real area of contact on another factor which is asperity deformation.
Online since: February 2014
Authors: Jian Guo Yin, Ming Rong Han, Long Qiang Huang
Main Design Parameters The main design parameters of the system are as follows: the utilization factor of the sintering machine is 1.25t/m2.h; the production capacity of single sintering machine is 60t/h; the air volume of single blower is 510000Nm3/h (there is the only blower in each cooling section) and the rate of air leakage is 35%; the amount of effective recycling flue gas is 330000Nm3/h in first section and second section respectively; the temperature of recycling flue gas is 380℃ through the first section and 250℃ through the second section; installed capacity of generators is 2×12000kW; years elapsed time is 7128h/y; annual energy output is 171072000Kw.h; the ratio of self electricity consumption is 20.7%; the selling electric quantity is 135660000Kw.h; The generating capacity of the sinter per ton is 16Kw.h; the selling electric quantity of sinter per ton is 12.68Kw.h; the flue gas is not circular.
By (1) and (2), to improve the utilization rate of the energy, i.e. to increase the energy grade Af, and to produce more electricity without affecting the main process and product quality, besides improving η by the traditional way, the sintering process must be paid attention to for the full use of chemical energy grade of the raw material, that is, to increase Br.
In the ORC cycle, those main properties of organic working medium (such as pentane) which involve low boiling point, condensing pressure close to or slightly greater than the atmospheric pressure, low temperature resistance, low rotate speed and low working pressure can be utilized so as to optimize the waste heat.
References [1] JIN Hongguang, ZHANG Guoqiang, GAO Lin, LIN Rumou: JOURNAL OF MECHANICAL ENGINEERING.
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