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Online since: August 2016
Authors: Carlos Augusto do Nascimento Oliveira, Karla Carolina Alves da Silva, Luiz Carlos Sekitani da Silva, Cezar Henrique Gonzalez
Thermoelastic properties have changed for each heat treatment.
For industrial applications, the characteristics of the thermoelastic properties should be known in advance and must remain constant.
The main factors influencing the shape memory properties are: chemical composition, crystal structures, grains size, thermomechanical treatments, training types among others factors [7,8,9].
Results and discussion The samples were analyzed by DSC to determine the thermal properties and to verify the changes promoted by heat treatments applied.
These curves show the strong influence of heat treatments on the thermoelastic properties in the shape memory phenomena.
Online since: September 2017
Authors: Shamil R. Mukhametzyanov, Nour R. Galyavetdinov, Ruslan R. Safin
The product, placed in a low-temperature plasma, is simultaneously impacted by a number of factors: charged and excited atoms, molecules and radicals, ultraviolet radiation, heat flux, electromagnetic field [11].
Kelley, Effect of hemicellulose extraction on physical and mechanical properties and mold susceptibility of flakeboard, J.
Pizzi, Optimising the properties of OSB by a one-step heat pre-treatment process, Holz Roh Werkst., 64 (2006) 227-234
Kazemi-Najafi, Influence of hydrothermal modification of fiders on some physical and mechanical properties of medium density fiderboard (MDF), Holz Roh Werkst., 66 (2008) 213-218
Chukhchin, The effect of beam-plasma modification of fibrin monomer on its biological properties, J.
Online since: June 2012
Authors: Mei Yang, Peng Fei Zhang, Ling Ye Leng
Introduction It is a popular task for scholars to study the mechanical properties of corroded reinforced concrete structure.
The Level of Current Density and The Polarization Time Group Cover thickness/mm current density /() Time for induced corrosion /h Z5 and Z6 15 120 720 Z7 and Z8 20 200 480 Fig.1 Corrosion circuit Influence factors of steel corrosion rate and control process 3.1 Predicted degrees of corrosion calculation formula Converting the current flow by Faraday’s law to metal loss: (1) Where △W is mass of steel consumed (g); A is atomic weight of metal (56 g for Fe); I is current (A); t is time (s); n is ionic charge (2); F is Faraday’s constant (96500 A/s).
So concrete cover quality directly affects the corrosion rate.
Corroded reinforced concrete cracking conditions According to the existing literature on this topic, there are three parameters affect the cracking corrosion quantity: fcuk=the compressive strength of concrete, R=steel bar diameter and(R+C)/C.
Mechanical industry press, Beijing, 1997
Online since: April 2012
Authors: Nahla Bouaziz, Lakdar Kairouani, M. El Ganaoui, D. Lounissi
The last term is the mechanical work transferred to or from the volume control.
The calculating procedures of the fluid thermodynamic properties and the performance coefficient were made using MAPLE computer tools.
However by decreasing the specific solution circulation factor (f) the flows of the weak and the rich solution decline and the temperature of the rich solution going to the generator falls until attaining the absorption temperature (30°C) so it affects the generator by increasing his work.
We note that condenser and evaporator are not affected by the changes of the intermediate pressure.
O’Connell: The Properties of Gases and Liquids (Fifth EditionBruce E.
Online since: October 2011
Authors: Vilas G. Meshram, Ajay L. Dandge
., Yeshwantrao Chavan College of Engineering, Nagpur, India a. . ajayldandge@gmail.com, b meshramvg@gmail.com Keywords: Phosphogypsum (PG), admixture, cement, concrete Abstract: Modern concrete is now common to use admixture (chemical or mineral), pozzolana’s for modifying different properties of concrete in fresh and hardened state.
This paper presents the salient features of the development of Phosphogypsum(PG) Cement Concrete and discuss the improvements affected in the properties of concrete with the use of PG as an admixture compared to the plain or conventional cement concrete.
Study were conducted for modifying the properties of the concrete, controlling the concrete production cost, to overcome the scarcity of cement, and finally the advantageous disposal of industrial wastes.
A) Chemical Composition of phosphogypsum B) Physical properties of Phosphogypsum Chemical Constituents Percentage Cao 31.16 SiO2 3.91 SO3 42.3 R2O3 3.6 Mg 0.49 H2O 10.09 Loss on ignition 19.8 Property Value Fineness 3250 Sq.cm/gm PH 2.5 Free moisture 19-35% Sp.
Erdem, The effect of phosphogypsum on the setting and mechanical properties of Portland cement and trass cement, Cem.Concr.
Online since: July 2022
Authors: Carlos M. Andrade, Marta C. Oliveira, Diogo M. Neto
The production of Ti-6Al-4V components by selective laser melting is particularly challenging, due to the highly localized heat input and large temperature gradients, which affect the material’s microstructure and final mechanical properties.
Material properties.
The physical and mechanical properties adopted in the simulations for the solid and liquid Ti-6Al-4V were taken from [27] and [28], respectively.
The physical properties of the powder were taken from [29].
Table 2 – Temperature independent material properties of Ti-6Al-4V.
Online since: October 2014
Authors: Gui Qin Li, Peng Cheng Du, Hong Bo Li, Xiao Yuan, Li Xin Lu
The mechanical analysis and the finite element analysis are done.
The square resistance uniformity between solar wafers is one of the key factors that affect the conversion efficiency.
The left of figure 4 shows the mechanical analysis model of single fulcrum cantilever beam.
Summary The stiffness of the paddle is a key factor for stability of the operation and efficiency in a new type of continuous diffusion furnace.
Simulation of the effect of power on the properties of Si-based films deposited by PECVD[J].
Online since: September 2014
Authors: Gumpon Prateepchaikul, Krit Somnuk, Naruemon Intarat, Thanansak Theppaya
Farag et al. [8] studied the factors affecting esterification of high percentage of FFA in mixed oil.
The RSM, a 5-level 2-factor central composite design (CCD), is employed to optimize two parameters (95% ethanol, and sulfuric acid).
The main goal is to determine the response surface model and optimal condition of the relationship between the acid value of the esterified oil and two factors.
The physical properties and compositions of MCPO and esterified oil were shown in Table 1.
Table 1 Physical properties and compositions of MCPO and esterified oil.
Online since: June 2022
Authors: Samson Olalekan Odeyemi, Uwemedimo Nyong Wilson, Mukaila Abiola Anifowose, Sefiu Adekunle Bello, Zainab Tolu Giwa
Strength Properties and Microstructure of Sandcrete Blocks Incorporated with Maize Straws Samson O.
This research investigates the strength properties of sandcrete blocks incorporated with maize straws.
The material constituents, their mix proportion, the inclusion of admixtures and the production process are important factors that to a large extent, affect the physio-mechanical states of the sandcrete blocks.
Since mechanical properties rely on materials microstructure, discrepancies observed in the hollow sandcrete blocks’ microstructures account for differences in the compressive strengths presented in Figure 3.
Neville, Properties of concrete, 5th ed., Pearson Education Ltd, London, (2011)
Online since: August 2020
Authors: Ghawsaddin Nazari, Shunya Yamanaka, Shigeyuki Date
These materials not only lead to reduction CO2, development of fresh and mechanical harden properties of concrete, but also utilize the industrial by-product which needs more landfill and waste disposal.
However, the presence of carbon influences fresh properties of concrete.
Bayasi, Effect of curing procedures on properties of silica fume concrete, Cem.
Pera, Pozzolanic properties of pulverized combustion bottom ash, Cem.
Sevinc, Effects of colemanite waste, coal bottom ash and fly ash on the properties of cement, Cem.
Showing 14011 to 14020 of 26166 items