Search results

Norimasa Iida maintained certain high-speed flame wave propagation characteristics of micro-channel and identified the main factors affecting the propagation [2].
To clarify the principles that narrow channel effects the gas deflagration flame propagation, this paper compares different potential factors, such as various narrow spacing and different initial gas deflagration velocity, which suppress flame propagation based on CFD (Computational Fluid Dynamics) numerical simulation.
In fact, the minimum ignition temperature of gas is also connected closely with gas concentration, pressure, turbulence intensity, and other factors.
Changes of chemical reaction rates can also be used to further explain the quenching properties of the channel.
Iida, “Premixed flame propagating into a narrow channel at a high speed, part 2: Transient behavior of the properties of the flowing gas inside the channel,” Combustion and Flame, vol. 60, 1985, pp. 257-267

Introduction When the actual equipment test, due to the random factors of the inherent factors in the product, manufacturing, assembly and the natural environment, each test result is different.
However, the existing virtual prototyping of equipment is analyzed under the certain factors, neither taking the size of manufacturing and assembly, and the discrete structural properties into account, nor considering the randomn of the input load.
So considering the impact of random factors can reflect the true nature characteristics of the equipment, when in the virtual test of the equipment.
Shooting process in the bore is affected by many random factors, not only there is the random interference in the firing process environment, but also in the powder itself.
Fig.1 Pressure curves of the cluster lead chamber Machine Gun RCWS Random Simulation Results Analysis When the bullet flys off the muzzle, the displacement, velocity and angular of the muzzle vibration are the important factors to affect the firing density.

So understanding the combustion affect to boiler heat transfer, will make great sense to oxy-fired CFBB.
The oxidation reaction of coke can be represented as: (13) In the formula, is mechanical factor.
So the important influence factors of heat transfer coefficient in CFB to be particle diameter- particularly in the dense zone.
So voidage is one of the important parameter , which affect the heat transfer coefficient in sparse zone.
Although radiation heat transfer coefficient is relevant to the physical properties and temperature, the increase of voidage will affect the time-averaged share of the wall, thus affecting the radiation heat transfer coefficient.

The main influencing factor is the extrusion temperature [2].
In case of a distinct texture, the mechanical properties of the profiles are anisotropic.
The specimens were machined out of extruded aluminum profiles, which were manufactured with different tool types for a comparison of the properties of the extruded profiles.
The observed difference of the weld-line in its hardness properties is reflected to the models using the reduced (by 15%) yield strength.
Following in the same footsteps, a more detailed approach should involve a detailed quantitative comparison based on the measured 3D anisotropic properties and their distributions over the extrudate sections.

Each type of sand is used in a certain area, in which it will be able to show its properties to the maximum: buoyancy, flowability, porosity and moisture capacity.
In the sand dewatering industry, various mechanical methods and means of sand dewatering have become exceptionally widespread, the use of which is simultaneously considered an integral part of the complex solution to the problem of preventing materials from freezing and preserving their free-flowing properties.
[9] Sand: Sources, Classification, Properties, Tests and Substitutes | Construction.
Kozlovskaya, A study of significant factors affecting the quality of water in the Oskil River (Ukraine).
Mechanical Engineering and Renewable Energy. 58 (2021) 93–100

These materials have attracted much attention in medical and mechanical engineering fields.
Actually, we further tried to prepare PDI-4 (with 12 mL water in the feed compositions) hydrogel, but the mechanical properties of the resulted hydrogel were too porous to be characterized.
The deswelling process is complicated because many factors influence and control the deswelling rate.
There are two factors accounting for this shrinking behavior.
Considering these properties, it is expected that macroporous and intelligent thermosensitive responsive of P(DEA-co-IA) hydrogels could be useful in biomedical fields for intelligent-responsive drug delivery systems.

The selection of an optimal material is an important aspect of design for mechanical, electrical, thermal, chemical or other application.
Introduction Material selection is an important aspect of design for mechanical, electrical, thermal, chemical or other application, and it is critical for the success and competitiveness of the producers [1,2].
Improper selection of materials may result in damage or failure of an assembly and significantly decreases the performance of products, thus negatively affecting productivity, profitability and reputation of an organization[3].
Moreover, after normalizing the data, the applying coefficient of variation method not only covers target attribute, but also eliminates misleading effects of different scales in materials properties. the calculation formula of attribute weight is given as follows: , where , , and.
In this study, the attributes are dielectric strength (), volume resistance (), dissipation factor (), dielectric constant (), thermal expansion () and relative cost ().

School of Mechanical and Automotive Engineering, Nanyang Institute of Technology 473004, china 3.
Introduction As a big agricultural country, China has abundant crop straw resources [1,2], According to Bi Yuyun and Cui Ming’s research, the amount of straw resources in more than 400 million t , straw biomass briquette is the main source of raw materials.Because different kinds of straw materials with the different physical and chemical properties , to change the main raw material for the forming and shaping of solid fuel combustion performance, other required materials are often mixed[3].
Combustion characteristics of mixed materials combustion characteristics of each material is linear or non-linear combination of the type and proportion of mixed material selection, and its burning characteristics will been affected.
Mixed with peanut shells or small wheat straw mixed materials in its activation energy in the combustion of volatile phases relative to the combustion of pure corn stalks, and its activation energy are reduced, but also shows that the pre-exponential factor reduces the intensity of combustion also reduces .
Add a small straw combustion characteristics of mixed materials and kinetic parameters less affected by wheat straw.

Introduction Toughness is a very important factor for materials design and application.
High impact toughness in base metal and heat affected zone (HAZ) is required for high strength pipeline steels [1-2].
Fig. 2 Optical micrographs in the specimens at the center (a, c) and surface (b, d) of steel plates 80µm a b c d 80µm 200µm 200µm Mechanical Properties and Microstructure Refinement.
Table 2 shows the mechanical properties of a 60mm thick steel plate.
Table 2 Mechanical properties of the steel plate σs, MPa σb, MPa σs/σb Elongation, % Akv, J (−40°C) Average 468 591 0.79 26.3 280 Range 420-500 560-625 0.71-0.85 24-32 194-293 Table 3 Notch impact toughness (Akv, J (−40°C)) through plate thickness Surface(up) 286 281 280 1/4 thickness(up) 291 283 285 1/2 thickness (middle) 294 293 287 1/4 thickness(bottom) 283 284 283 Surface(bottom) 295 294 288 Summary A ultra low carbon acicular ferrite steel was produced in a industrial scale at Xiangtan Steel with good combination of high strength and toughness by means of a special design of chemical composition, a special process of TMCP-RPC, in which the methods of grain refinement, precipitation strengthening, dislocation strengthening and structure strengthening were utilized to strengthen and tough the steel grade.

In this paper micro-hole machining is regarded as the research object, effects of many factors such as power supply natures, electrolyte composition, pulse width and pulse frequency on machining accuracy in micro-hole ECM have been evaluated.
Various types of micro-structures such micro-shafts, micro-holes, micro-slots, micro-gears，micro-paddles and micro-motors are used in communication systems and micro-electro-mechanical systems (MEMS) widely[1,2].
Experimental research of ECM for Meso-scale micro-hole is mainly introduced in this paper, the technological factors which influence ECM accuracy of micro-hole are scrutinized and studied, which mainly include power supply natures, electrolyte composition, pulse width and pulse frequency.
Effects of Power properties on machining accuracy of micro-hole Effects of machining voltage on side gap(single gap) distribution of micro-hole when using DC electrochemical machining is studied firstly.
Mechanical Science and Technology, 25(2) (2006)242-245