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Online since: October 2023
Authors: Yurii Senchykhin, Vadym Avetisian, Konstantin Ostapov, Igor Kirichenko
Due to its adhesive properties, gel layers are almost immediately attached to differently inclined surfaces that are protected against fire.
Kovalevska, Parameters of fire-retardant coatings of steel constructions under the influence of climatic factors.
Hua, Experimental study on fire extinguishing properties of compound superfine powder.
[23] I Dadashovet al., Simulation of the insulating properties of two-layer material.
Ostapov et al., Improving the Quenching of the Undercarriage Space Due to the Adhesive Properties of Gel-Forming Compositions.
Online since: October 2010
Authors: Sergey V. Dorozhkin
ACPs have variable chemical but rather identical glass-like physicochemical properties.
Furthermore, to be used in surgery, all implantable 3D constructions must possess the necessary mechanical properties, which is difficult to achieve in the case of ACPs.
For example, both dense blocks and porous scaffolds made of calcium orthophosphates reach their mechanical properties only after sintering at temperatures, exceeding ~ 1000 °C, which is impossible in the case of ACPs (see “Thermal properties” section above).
Amorphous calcium phosphates: synthesis, properties and uses in biomaterials.
Existing calcium orthophosphates and their major properties [26, 27].
Online since: September 2013
Authors: Aki Sorsa, Mika Ruusunen, Kauko Leiviskä, Suvi Santa-Aho, Minnamari Vippola, Toivo Lepistö
The BN signal is obviously affected by the number of pinning sites and is shown to be highly sensitive to many material properties such as microstructure, residual stress and hardness. [1] A typical BN signal is shown in Fig. 1.
However, it should be noticed that the prediction of material properties is case-dependent and the other features may be more significant with other materials.
The improvement in the prediction accuracy when compared to the studies in [11] is assumed to be due to changes in material properties.
It has been shown to be sensitive to many material properties such as residuals stress.
Wright, Convergence properties of the Nelder-Mead simplex method in low dimensions, SIAM J.
Online since: April 2014
Authors: Li Tian, He Zhang, Xiao Wei Liu, Yao Liu, Xiao Wei Han
The polymers hold great promise for the multi-layer microfluidic devices, such as attractive chemical, electric and mechanical properties; excellent optic transparency and inexpensive.
The plasma-treatment is a significant method to reduce the temperature and pressure [17-20], the purpose of plasma-treatment is to change the surface properties of PMMA substrate.
Table1: The comparison of solvent performance Reagents Risk Toxicity Solubility Changes Glycol(C2H6O2) flammable and explosive trace hardly no Acetone(C3H6O) flammable and volatile low almost all clarify Butyl acetate(C6H12O2) flammable and pungent low almost all clarify Chloroform(CHCl3) pungent and pollution moderate all turbid Dimethylformamide(C3H7NO) flammable and explosive moderate trace no Ethylene glycol dimethyl ether(C4H10O2) flammable, explosive and pungent moderate almost all no By considered risk and toxicity factors, we choose chloroform as bonding solvents finally.
The affect of fumigation time, the steam concentration and the ambient temperature will research in subsequent article.
Online since: May 2014
Authors: Kip O. Findley, Shane C. Kennett
In the current paper, the effect of PAGS on strength and toughness properties will be assessed for quenched and tempered martensitic steels produced from the equiaxed PAG conditions.
Since the Gleeble® compression sample geometry is not conducive to extracting tensile specimens, microhardness measurements were used instead to estimate tensile properties.
This finding is important for the TMP samples, where the geometry is not conducive to machining mechanical test specimens after processing.
The increase in strength due to TMP could be due to many factors.
However, the final martensitic microstructure can be heavily textured, which can affect the coherence length of {001}α’ planes.
Online since: March 2015
Authors: Fei Han, Ranko Radonjic
Tugcu, the value of stress and strain by onset of the wrinkling depends not only on the mechanical properties of the used material, but also on the geometry of the specimen [5].
The mathematical definition of plastic deformations can be expressed as follows: εij=ϑsij (6) Where a relationship between strain rate εij, proportionality factor ϑ and the stress deviator sij is constructed.
As an example, the minor strain rate under plane stress condition is: ε2=ϑs2=ϑ(σ2-σm) (7) The proportionality factor ϑ in Levy-Mises´s flow law can be calculated, where equation (6) and the flow law of Mises are combined, kf is the flow stress.
Next, it will be explained how the strain rate fall affects the stresses.
Simulations of the tensile tests for the mentioned specimens were performed using software LS-DYNA in order to evaluate the related properties, such as the stress and strain distribution over time [11].
Online since: April 2013
Authors: Cherng Shing Lin, Chia Chun Yu, Te Chi Chen, Shih Cheng Wang, Liang Yi Shen
Wooden Buildings by the Fire Damaged of Toxic Gases on Personnel Evacuation Influences Cherng-Shing Lin1, Chia-Chun Yu2,*, Te-Chi Chen3, Shih-Cheng Wang4 and Liang-Yi Shen5 1~5Department of Mechanical Engineering Yuan Ze University, Taiwan 32003, R.O.C email: jjy5418@gmail.com Keywords: Grass Mountain Chateau, Wooden Construction, Smoke.
Introduction There are many case studies of different kinds of fires, which explore and analyze the fire dynamics, temperature variation, and smoke hazards factor.
Table 1 Comparative of concrete and wood materials [1-2] Properties Concrete (general) Red cypress Specific weight 2.3 0.40 Tensile Strength 5~20 720 Compressive strength 150~250 470 Flash point(°C) N/A 253 Ignition point(°C) N/A 446 Fire Phenomena and Material Properties Fire Phenomena.
The speed of how fast oxygen concentration gets consumed at its limit is affected by the amount of combustibles, burning speed, the volume of burning areas, and gas permeation.
Visibility is an influence factor whether evacuees can escape the burning building, and firefighters can find and extinguish the fire or not.
Online since: April 2021
Authors: Alokesh Pramanik, S. Narendranath, I. Vishal Manoj
Optimization and Prediction of Machining Responses Using Response Surface Methodology and Adaptive Neural Network by Wire Electric Discharge Machining of Alloy-X I.V.Manoj1,a*, Narendranath S1,b and Alokesh Pramanik3,c 1Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal 575025, India 2Department of Mechanical Engineering, Curtin University, Perth, WA 6102, Australia avishalmanojvs@gmail.com, bsnnath88@yahoo.co.in, calokesh.pramanik@curtin.edu.au Keywords: Wire Electric Discharge machining, Alloy-X, Grey relation Optimization, Response surface Methodology prediction, Artificial neural network prediction.
Introduction Nickel-based superalloys are having excellent mechanical properties such as fatigue strength, high strength, high thermal resistance, and high corrosion resistance with thermal stability.
It was observed that the pulse on time and servo voltage are the most dominant parameters affecting material removal rate and surface roughness.
It is observed form L25 orthogonal taguchi experiments and ANOVA that pulse off time and wire-speed were insignificant on cutting speed and surface roughness whereas the pulse on time and servo voltage were the significant factors.
Online since: November 2005
Authors: Young Sup Lee
Piezoelectric transducers have been widely used in various smart structures and mechanical systems [1, 2].
The physical properties of the steel beam were mm1 203002 ××=×× syx hLL and the thickness of the PVDF sensor was m52µ=peh , and the constant k in Eq. (3) is 1/15.
Lee and Moon [3] showed the response of piezo sensors was sensitive to small errors in the shapes of the transducers, particularly affecting the high frequency response.
(9) where )(ωnB , )(xnφ , onω , sρ , sA and sη are the harmonic modal amplitude, mode shape, natural frequency, density, sectional area, and loss factor of the beam.
The position sensor was designed based on the electromechanical property of the piezoelectric transducers piezoelectric to generate charge output proportional to the tip displacement of a cantilever beam when the beam is subject to purely flexural motion.
Online since: September 2013
Authors: Hui Xu, Guo Bin Li, Dong Sheng Song, Jian Feng Zhao
For example, the natural sediment is hard to be prepared according to the particle size scale and cannot meet the similarity requirement; the plastic sediment is easy to slide, of small submarine rest angle, poor hydrophilicity and difficult forming and expensive; the clean coal is of unstable physical-chemical properties and often has refining and flocculation phenomenons to make the test result distort[1].
Therefore, strengthening the development of model sediment and finding some light sediments, which have stable physical-chemical properties, not including viscosity, unit weight and particle size, are capable of manual adjustment and cheap, have long been the direction of the research conducted by scholars at home and abroad.
Based on the previous researches and practices, the author carried out experimental studies on the physical and motion characteristics of bamboo powder model sediment by using various technical means. 1 Physical characteristics of bamboo powder model sediment The bamboo powders used in this test came from Xuancheng, Anhui, which were obtained from natural moso bamboo after mechanical pulverization.
As there was clearance in the bamboo powder particle and the moisture content in the clearance would affect the unit weight, therefore, the particle unit weight referred to the weight per unit volume under saturated moisture content of particle clearance and no moisture content was on the particle surface.
Compared with the single particle settling velocity, the group settling of model sediment was complicated and other factors including sediment concentration and water quality could not be ignored in addition to the particle size of model sediment.
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