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Online since: September 2013
Authors: Peng Ping Li, Jian Bo Xiong, Sheng Nian Wang
Therefore, for the motive of designing SCC with excellent workability and mechanical properties, proper factors such as water to binder ratio, mineral admixture and sand ratio should be chosen.
Table 2 Mix proportions and properties of concrete Mix Mix proportion [kg/m3] Slump Flow [mm] T500 [s] Δh [mm] Compressive strength [Mpa] Cement FA GGBS Sand Gravel Water 1 520 - - 826 894 165 635 4.8 20 64.5 2 416 104 - 809 877 165 640 4.9 25 60.8 3 364 156 - 803 870 165 645 3.5 20 57.2 4 312 208 - 795 862 165 655 4.3 20 54.9 5 286 234 - 792 859 165 650 3.5 25 52.7 6 364 - 156 823 892 165 650 4.3 20 62.7 7 312 - 208 821 889 165 645 3.7 25 58.2 8 260 - 260 819 888 165 640 4.4 25 56.9 9 208 - 312 817 886 165 630 4.5 25 52.1 10 260 52 208 814 881 165 635 4.3 25 59.2 11 260 104 156 808 875 165 640 4.2 20 57.4 12 260 156 104 802 868 165 640 3.4 20 56.6 13 260 208 52 796 861 165 650 3.2 15 54.2 Concrete basic properties.
Concrete basic properties, such as slump flow, T500, Δh and compressive strength at 28d are given in Table 2.
Curing age affected the chloride diffusion coefficients obviously.
Study on dense packing properties of cementitious materials.
Online since: February 2021
Authors: Federico Rossi, Andrea Nicolini, Alberto Maria Gambelli, Deepak Kumar Sharma, Riccardo Alleori, Marco J. Castaldi
These apparatuses are thought for determining macroscopic properties of gas hydrates, such as phase equilibrium and others; such reactors operate in a manner very similar to the devices used from Davy, Villard and de Forcrand when they reproduced for the first time methane, ethane and propane hydrates.
Moreover, the hydrate formation process is a nostoichiometric process, which depends on several factors, i.e. pressure, temperature, associated fluid phase composition, presence or absence of a porous medium, reservoir saturation, etc [4, 5].
Moreover, the continued dimensions of these apparatuses make necessary the consideration of other further factors, which may intervene in the process, which both a potential positive or negative influence [6].
Chemical Engineering Journal, 2008; 135 71-77 [20] Jerbi S, Delahaye A, Oignet J, Fournaison L, Haberschill P, Rheological properties of CO2 hydrate slurry produced in a stirred tank reactor and a secondary refrigeration loop.
Energy & Fuels, 2005; 19 (3) 869-876 [64] Zhang B, Zheng J, Yin Z, Liu C, Wu Q, Wu Q, Liu C, Gao X, Zhang Q, Methane hydrate formation in mixed-size porous media with gas circulation: Effects of sediment properties on gas consumption, hydrate saturation and rate constant.
Online since: August 2019
Authors: O.M. Lemine, Sharif Abu Alrub
It was found from our study and from other works that heating efficiency of the nanoparticles are affected by sample preparation method, magnetic properties, the amplitudes and frequency of the applied field, etc, [5,8,10-12].
The aim of our work is to tune the magnetic properties of γ-Fe2O3 by the use of mechanical alloying of a mixture of γ-Fe2O3 and CoO powders followed by annealing at 900°C for one hour.
These changes in magnetic properties are attributed to enhancement of the crystallinity of the annealed sample and the formation of spinel ferrite.
Brazel, The effect of annealing on the structure, magnetic properties and AC heating of CoFe2O4 for biomedical applications.
Suzdalev, Synthesis, Phase Formation Study and Magnetic Properties of CoFe2O4 Nanopowder Prepared by Mechanical Milling.
Online since: July 2016
Authors: Giorgio Monti, Marco Vailati, Giorgia di Gangi
The code does not provide guidance about this topic: it just proposes a solution according to the classical deterministic approach, corrected by using the so-called Confidence Factors (CF).
The geometry can be input through 2-D or 3-D dxf files, which allow a better assignment of material properties to different walls, distinguishing them by layers.
With known geometry, VENUS automatically computes the inertial properties of each storey, including also the torsional stiffness in case of eccentricity between center of mass and center of stiffness.
Output data of a generic storey GLOBAL SAFETY FACTORS STOREY SAFETY FACTORS DIR LS MIN.
FACTOR MAX.
Online since: March 2011
Authors: Jian Sheng Jiang, Li Lin
Research on optimizing the high chromium material’s properties Concerned investigation indicates that, the main caution of the cylinder liner’s premature fray is the lower rigidity of the inner coat material, which is HRC55~58.
In fig.3, The comparison of the affects of the heat treatment by different technologies is displayed.
When choosing mould’s rev, two main factors should be considered: 1) rev of the mould should assure that after molten iron is poured into mould it can form intact cylindrical outer; 2) we must assure that immanent quality of cylinder liner reach requirement to avoid lacuna as pore, lard and pulverization.
When pouring mould’s temperature is an important factor, which may affect produce’s quality.
[3] Yoshirol wai, Kazuyuki Nambu, Slurry wear Properties of Pumping materials, Wear, 1997(210): 211-219
Online since: December 2012
Authors: Lu Xia, Jin Huang, You Shou Zhang, Dan He
Results and discussion Property of 32B8M15 binder no-bake sand.
Research on modified binder no-bake sand Influence of organics N on the property of 32B8M15 no-bake sand.
Influence of solidification agent amount on the property of 32B8M15N4 and 32B8M15 no-bake sand.
In order to eliminate external factors, 32B8M15N4 and 32B8M15 no-bake sand mold or core are made simultaneously to discuss the effect of addition amount of fused MgO on their performance, such as liftability, dry strength and storage stability.
Fig.3 shows property test results of 32B8M15N4 and 32B8M15 no-bake sand with adding MgO.
Online since: February 2013
Authors: Dong Mei Zhao, Xue Peng Liu
For example, in the industrial automation, office automation and family automation residential use a lot of motor, almost all the power device to control, will be scheduled control scheme, planning instruction into expected mechanical movement.
Motion control was accused of mechanical movement to realize accurate position control and speed control, acceleration control, torque or force control, and these was accused of mechanical quantity of integrated control.
In a circuit with what kind of transistor no obvious limits, mainly depends on the transistor itself parameters, characteristics of the factors such as restrictions and cost.
But MOSFET fine self all flow properties that make it easy and even, so its expanding power use does not exist a lot of obstacles.
Therefore, drive circuit fit and unfit quality directly affect the performance of the converter.
Online since: May 2012
Authors: Xiao Bin Li, Ying Li, Xiang Shao Kong
The experiment result demonstrates that the experiment method could simulate the dangerous conditions during the real construction and check the stress effectively which can provide technical support for the construction of similar bridges. 1.Introduction Arch-girder combination bridge becomes more and more important in bridge construction because of its outstanding mechanical property and good adaptability for construction [1].
Its properties are showed as follows.
This experiment took the contour size and thickness as fundamental dimensional analysis factors.
That is to say, wind load is nonlinear factor.(3)There is nearly no residual stress after unloading.
(6) Rigidity, weight, length and other factors should be taken into account, so that large stress and deflection of launching nose does not appear in the biggest cantilever state
Online since: October 2011
Authors: Wan Shan Wang, Peng Guan, Ji Qiang Li, Shuang Zhu, Tian Biao Yu
Advances in Simulation of Grinding Process Peng Guana, Jiqiang Lib, Shuang Zhuc, Tianbiao Yud, Wanshan Wange School of Mechanical Engineering and Automation, Northeastern University, Shenyang, P.R.
Main Contents of Grinding Process Simulation As a complex physical process, grinding process is subject to a number of input factors and produces a variety of physical and mechanical phenomena.
Grinding wheel topography simulation is mainly modeled for specific structure and morphology of modeling of the grinding wheel surface, and implements the grinding simulation in order to analyze the grinding properties of the grinding wheel.
Grinding forces, grinding temperature and grinding vibration produced during grinding are the main factors affecting the grinding quality.
Online since: February 2026
Authors: Waleed R. Abdullah, Adian Arkan Mahmood
Results and Discussion The reaction mixture consisting of inorganic salts (sodium chlorate, ammonium perchlorate), iron filings as oxidizing factors, sawdust, activated charcoal, and distilled water, all work as an exothermic system.
The change in the volume of distilled water does not affect the temperature, as indicated in table 4, while the type of charcoal has a role in increasing the number of adsorbed molecules (rate of adsorption) [14]. while changing the weight percentages of inorganic salts gives us the greatest effect among all the components of the mixture because both salts disintegrate into stable products such as sodium chloride (NaCl) and ammonium chloride (NH4Cl) which disintegrate into ammonia gas (NH3) and hydrogen chloride gas (HCl) [15].
The rate of the exothermic reaction The reaction speed was not affected by the iron filings, sawdust, distilled water, and activated charcoal, these materials do not change the reaction speed and are considered auxiliary factors although the iron filings are considered a major reactant because it is oxidized by inorganic salts (chlorate ClO3 and perchlorate ClO4).
[2] Alserai, SJ., Alsaraj, WK., and Abass, ZW., Effect of Iron filings on the mechanical properties of different types of sustainable concrete, open civil Eng.
[7] Abdullah, Waleed R., Standard Sand Specifications Development by Mechanical Attrition Scrubbing to Make It Convenient for Cement Industry, Key Engineering Materials, Vol. 870, 2020, pp. 61-70
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