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Online since: November 2015
Authors: Zhen Yuan Nie, Hong Chang Liu, Jin Lan Xia, Hong Rui Zhu, Yi Dong Zhao, Chen Yan Ma, Xiang Jun Zhen, Yun Yang, Lei Wang, Jian Jun Song, Chang Hui Zhao, Ya Long Ma
These determinations were performed to obtain enough reduced or oxidized products for analysis of S/Fe/Cu speciation by S K-edge and Fe and Cu L3-edge XANES and Raman spectrometry to define the thermo-reduction process of chalcopyrite at 65°C [3]. 2.
For thermophiles, the thiol group concentration in S0 grown cells was in the range of 2-4 time that in Fe2+ grown cells (data as yet unpublished).
These data indicate that extracellular –SH groups take part in the activation of S0.
Both Fe2+ and Fe3+ were bound to extracellular –OH groups (data unpublished as yet).
Online since: July 2015
Authors: Zbyšek Pavlík, Jaroslav Pokorný, David Citek, Jan Fořt, Jiří Kolísko
Also dosage of jute and polypropylene fibers was examined with promising result with respect to the increase of permeability of HPFRC and reduction of explosive spalling of concrete [7].
At the evaluation of measured data, the circular cross section of capillaries was assumed [10].
The elastic modulus data corresponds to the dried samples and represents average value from five independent measurements.
Looking at the data obtained for composite samples exposed to temperatures of 600°C and 800°C, there is a distinctive shift in the volume of pores and increase in the pore diameter up to 10 μm.
Online since: August 2015
Authors: Cherdpong Jomdecha, Isaratat Phung-On
A good linear relation can be shown with R2 = 0.99 of the fitted data for both frequencies.
The statistic uncertainty from calibration data (UA1 = 7.9 MPa) and accuracy of tensile tester (UB = 0.0289 MPa) were employed to calculate the uncertainty of calibration (UC1) which resulted to UC1 = 16 MPa at 95% of confident.
Iqbal, Eddy Current Detection of Changes in Stainless Steel after Cold Reduction, Comput.
ISO/IEC Guide 98-3, Evaluation of measurement data: Guide to the expression of uncertainty in measurement, (2008)
Online since: January 2012
Authors: Vesselin Michailov, R. Ossenbrink, Ossama Dreibati, Nikolay Doynov
However, the numerical welding simulation requires a mathematical approach and input data to describe the changing of thermomechanical properties due to dissolution of the β''(Mg2Si)- precipitates.
The determination of the required input data is coupled with further investigations of physical entities, which limits its application.
The necessary data of the studied material has been determined experimentally and an engineering approach for the calibration is proposed.
The strongly strength reduction in peak temperature range 200 - 400 °C is caused by the dissolution of β''(Mg2Si)- precipitates.
Online since: January 2023
Authors: Redi Bintarto, Fikrul Akbar Alamsyah, Teguh Dwi Widodo, Rudianto Raharjo, Arif Wahyudiono
It is hoped that this research can produce cutting results that have good roughness values and microstructure photos as reinforcement for rough-ness data.
The results show that all of data of stainless steel 316L cut with abrasive water jet cutting has nobler Ecorr compare to stainless steel 316L cut with conventional cutting method.
The results show that all of data of stainless steel 316L cut with abrasive water jet cutting has nobler Ecorr compare to stainless steel 316L cut with conventional cutting method.
The second area is the Principal Zone where the current area begins to experience a reduction in velocity depending on its radial and axial direction.
Online since: January 2016
Authors: Tereza Brožová, Ilya Astrouski, Tomáš Luks, Miroslav Raudenský
However, a number of important questions (such as manufacturing technology, operation limits, service life, etc.) are still unknown and require additional studies.This paper is intends to provide data about the service life of bundles of polymeric hollow fibres because it is a very important variable and should be guaranteed for every technological device.
The experimental equipment was constructed as follows: two water filters were placed at the input, which was then connected to a pressure reduction valve, and then a system of two electromagnetic valves between which were the bundles of hollow fibres with a pressure sensor.
The scheme of the tested configuration is shown in Fig. 2.Fig. 2: Scheme of connection The National instruments cDAQ was used as a platform for valve controls and a measuring program written in LabVIEW was used for data logging.
The program generates periodic pulses for opening and closing valves with the corresponding frequency and duty cycle and records data.
Online since: December 2013
Authors: Ping Li, Zhi Xin Wang, Sheng Dan Feng, Li Su
Introduction Considering the greenhouse gas emission reduction and efficient utilization of coal, the coal gasification technology is more utilized in some chemical plants.
Here, for the first time, we aim at exploring the ash fusion properties of Ningdong coal blending and analyzing the mechanism, the obtained data will provide valuable information on the influence of minerals on combustion in existing and developing systems, as well as on the utilization of process residues.[5] In addition, the results will be helpful for improving slagging and promoting the effectively use of feed coal, and be useful to improve efficiency, capacity and availability of the facilities.[6,7] This research endeavors to add to the existing knowledge in the field of coal science, further research on the experimental and theoretical work of coal blending combustion is required if more instructive information is to be understood.
Especially, the data suggested that FT tendency is different.
Moreover, these data are consistent with the notion that the blended ash temperatures are non-linear related to the blending ratios of the low AFT coal ashes.
Online since: December 2013
Authors: Khelidj Benyoucef, Kellaci Ahmed, Karas Abdelkader, Mazouzi Redha
Table 1 contains the geometry and the simulation data taken for the numericalexperiments.
Table 1 Geometry and simulation data Diameter of piston (mm) 83 Radius of crankshaft (mm) 41.8 Connecting rod Length (mm) 133 Piston skirt length (mm) 33.8 Piston skirt angle (degrees) 37.5 Radial clearance (μm) 13 Cp (mm) 1 Cg (mm) 2 a (mm) 12.5 b (mm) 1.5 Mass of wrist-pin (Kg) 0.09 Mass of piston (Kg) 0.295 Engine speed (r.min-1) 1000 (a) (b) (c) (d) Fig. 4 Hydrodynamic pressure profiles: ψ = 90 °(a), ψ = 270 °(b), ψ = 420 °(c), ψ = 630 °(d) Fig. 5 shows the variation of hydrodynamic and contact friction forces actingon the piston according to the crank angle.
We cansee that the piston is deformed primarily in the bottom of the skirt as above.According to the detailed numerical data, we found that the maximum radialdisplacements at the lower end of the skirt are 0.69 microns on the thrust side and0.4 microns on the anti-thrust side.
Suzuki, Approach to Minimization of PistonSlap for Noise Reduction.
Online since: September 2013
Authors: Guo Liang Chen, Xiao Yang Chen
Expressed by the following relationship: (2) Where: S ─ probability of survival; τ0 ─ maximum dynamic shear stress amplitude; z0 ─ where thedepth of maximum dynamic shear stress; N ─ stress cycles to count a million times; V ─ a stressed volume; a ─ Hertzian contact ellipse long axle; l-rings running the length of the raceway; e ─ Weibull distribution slope parameter; c, h ─ material constant, regardless of the state of contact; Since the eighties, with the improvement of the quality of steel, originated in the cracks under the surface flaking resulting reduction surface cracks which stems from flaking produced more common, which began two concerns contact fatigue crack expansion mode: surface fatigue crack growth under way and surface fatigue crack propagation mode.
(8) Where: F (N) - Defect life distribution; The formula (8) into equation (6) have bearing survival probability expression: (9) Where: S (N) —containing bearing survival probability volume defects; A defect life factor; τ 0 — the ultimate fatigue constants (MPa); ζ—stress index; β—life discrete index; ZS—stress measuring depth (usually: surface) (mm); h—value constant; m—defect density; t crit —Dimensionless critical stress; Pmax — the maximum Hertzian pressure (M Pa); l—raceway length; Z0 —the maximum Hertzian shear stress range in depth (mm); a— Hertz contact half length (in the direction perpendicular to the rolling) (mm); A new prediction model of rolling bearing fatigue life In 1996, T.E.Tallian is presented based on the L-P theory of the rolling bearing life data fitting a new prediction model[6] (T model),in which this model introduces the smelting process, surface defect, surface roughness, residual stress, elastohydrodynamic lubrication
No. 3: 7 [4]Wan chang seng,Anlysis methode of the rollings bearing (Chineses) [M].Bajing: mechanical industrial press ,1985.139-163 [5] T.E.Tallian,A data-fitted rolling bearing life prediction model-part I: mathematical model[J].Tribology transactions 1996,39 (2):249-258 [6] T.E.Tallian, A Data - Fitted Rolling Bearing Life Prediction Model - Part Ⅱ: Experimental Database[J].Tribology transactions. 1996 ,39 (2):259~268
Online since: September 2014
Authors: Hao Liu, Jun Li Wan, Shi Run Cheng
The structure of the throttle is mainly composed of a DC motor, reduction gears, a return spring, a throttle valve slice and a throttle position sensor, etc [6].
The P2.1 and P2.1 of AT89C51 is connected with SCL and SDA pin of the AD conversion chip, contracting with the AD conversion chip via the serial communication to realize the input of command and the output of the data; P2.2 is the direction output pin, which controls the rotating direction of the motor; P2.3 is the PWM output pin, which controls the rotating angle of the motor; P0 port is connected with the data port of the LCD display chip so to transfer display data, and the P2.5-P2.7 port are used to control the LCD chip to write and read.
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