Search results

Thus, the present case of failure was due to overheating by the formation of oxide scale in Fig. 4 (a), which led to a reduction in wall thickness caused by yielding adjacent to the rupture area.
It is evident from the data in Table 2 that the Vickers hardness test results for before and after fracture have different value.
Thus, the present case of failure was due to overheating by the formation of oxide scale, which led to a reduction in wall thickness caused by yielding adjacent to the rupture area.

According to the difAlrent of the reducing agent, deNOx includes the following: (l) With ammonia as a reductant of selective catalytic reduction (NH3 a SCR); (2) For the selectivity of the reducing agent in hydrocarbon catalytic reduction (HC a SCR); The two types of reaction is rich in oxygen, namely the poor fuel (leanbum) conditions, the existence of the oxygen to reaction indispensable; Based on the above two fields within the Al-ZSM-5 as the object of research, the catalytic activity analysis.
NO after the initial concentration determination, adjust the temperature control instrument set data, make the reactor to the required testing temperature, and record after stability NO density, namely this reaction temperature of NO balance density.

However, the very low density of hydrogen may lead to a reduction in the energy density of the mixture charge and power output [2].
The in-cylinder pressure and combustion data acquisition consists of an AVL IndiSet IndiComV2.0 cylinder pressure transducer and a combustion analyzer.
It means that the engine can be operated at lean conditions by adding amount of hydrogen to take the advantage of lean combustion without reducing the driving stability. 3) The increase of excess air ratio leads to a significant reduction in CO and HC emissions.

At the final stage of work there were determined the strength of control samples by using the destructive inspection method, and then the collected data were compared with the previously obtained integrated values of heat release (Table 1, Fig. 3).
The given method has several advantages over the standard methods, which determining the effectiveness of accelerators by strength determination, including: · reduction of labor costs for the sample preparation; · better reproducibility of results compared to the destructive control methods; · possibility to determine the hardening kinetics at any time using a single sample.
The practical significance of results obtained herein is the possibility of a significant reduction in time spent on the selection of optimal accelerator at the development of concrete composition or any other mixture based on the cement binder, and the possibility to reduce the cost of final formulation by optimizing the accelerators dosages.

From UV illumination data effective oxide charge was calculated as 3.7x1011cm-2 and -5x1011cm-2 for NO and 1400oC dry oxide sample respectively.
This could be due to the reduction in the interface charges and/or reduction of surface roughness.

In order to record the circuit equations, the following parameters are defined: u (t): Duty Cycle N: Reduction Ratio θ (t): Throttle Angle (rads) i (t): Armature Current (A) VBat: Supply Voltage (V) Vb(t):Back EMF (V) Ra: Armature Resistance (Ω) L: Armature Inductance (H) T (t): Motor Torque
ω (t): Throttle Angular Velocity (rad/s) The inertia of throttle plate and reduction gears are ignored because they are far smaller than motor rotor inertia.
[4] Ibrahim Haskara, Umit Ozgiiner, Vadim Utkin: Variable structure control for uncertain sampled data systems.

The increase in laser power to 20 W accompanied by a reduction in scanning speed to 30 mm/s results in the surface being remelted and strongly oxidized (Fig. 2f).
Fig. 3 Equivalent circuit used to model impedance data for copper in 1M NaCl solution.
The roughness measurements show that the formation of the corrosion layers resulted in the reduction of roughness from 0.42 to 0.36 μm in sample 0, from 0.28 to 0.25 μm in sample 1, and from 12.5 to 8.1 μm in sample 2.

Too high or too low temperature can affect the property of polymer.When the temperature is too low,the reaction rate is slow because of long induction period initiated by free radical.Due to monomers which can't take part in reaction completely and initiator consumed.Unreactant monomer can't participate in reaction leading to the reduction of monomer conversion rate.The crosslinking degree of production decreases obviously.
Only a small part form gel state and most of them become viscous.The product, which shows better water-absorbent ,low strength after moisture-absorption and reduction in moisture absorbency ,can't form valid three dimensional network structure .It's benefit for the period initiated by free radical under high temperature.But high temperature leads to fast speed,which will induce explosive polymerization and increase the difficulty in controlling the reaction.The resulting polymer has low humidity-absorbency.
Data Vol. 46(2001), p.858 [3] Tashiro Y: Journal of Materials Science Vol. 39(2004), p.1315 [4] Wing R E , Swabson C L, Doan W M.

A representative data set of physical and mechanical properties composed by more than 70% by-products (desulphurization residues, fly ash) small block specimens produced using simple manufacturing methods is presented with the aim of studying their suitability as gypsum-based non-autoclaved aerated concrete.
It indicates that the increase in the substitution amount of Desulfuration residue causes a reduction on the product dry density for all mixture compositions.
Relatively lower specific gravities (1.83) and pore structures of Desulfuration residue than fly ash (2.20) could be attributed to these dry density reductions.

The percentage composition of each phase was calculated from the XRD data.
(3)The oxidation and reduction principle The pure copper powders (99.9% in purity, -100mesh) were ground in the dilute hydrochloric (pH=2) acid solution by a planetary ball mill.
It is obvious that oxidation and reduction occur simultaneously in the system.