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Online since: May 2025
Authors: Mohamed Walid Halimi, Imen Bouelkreb, Messaoud Hemmous, Abderrahim Guittoum
Several methods are being used for the synthesis of FeCo NPs such as mechanical alloying (Ball Milling), chemical reduction method, Hydrothermal method, among others for the purpose to control their size, shape, and composition [1-5].
The conventional spectrometer apparatus setup consists of an electronic chain consisting of a voltage generator NHQ205M, an amplifier model 2025, a function generator DFG1200, a drive unit MR360, Data Acquisition Module CMCA-550, Mössbauer Bench MB-500 with Mössbauer Velocity Transducer MVT-1000 and Absorber holder, of WISSEL instruments with a full width at half maximum (FWHM) of 0.194 mm/s.
Sample (mm/s) (mm/s) (T) relative spectral area (%) A23 DTI Zeeman sextet Fe15Co85 -0.0812 0.0000 31.4657 95.559 1.5692 0.00048436 Fe10Co90 0.0857 0.0000 28.3363 95.071 1.5022 0.0039902 broad singlet Fe15Co85 0.24745 / / 4.441 / / Fe10Co90 -0.1500 / / 4.929 / / As can be seen from the presented data there are multiple disordered phases in the sample, with a change in Co concentration in structure, it indicates Co concentration dependence, where for Co-rich alloys (Fe10Co90) the FCC (face-centered cubic structure) contributing to the decrease in Bhf due to the absence of BCC (body-centered cubic structure).
This support the suggestion that the applied 57Fe Mössbauer spectroscopy method for investigation properties of alloys is a good tool in the case of hydrothermal synthesized binary, iron-based NPs, and it can supply experimental data.
Magnetic properties of FeCo alloy nanoparticles synthesized through instant chemical reduction.
Online since: May 2014
Authors: Sachin D. Kore, Jyoti Kumar Doley
B, C, n and m are the five material constants which are determined from the experimental data.
Results and Discussions: The simulations carried out in LS-DYNA® with the above data involving a die, Al worksheet and a spiral coil (Fig. 4) gives deformations at various input voltages.
On the other hand, at high temperature there is a reduction in the flow stress of the material which in turn promotes deformability at lower forces.
This is due to prominent effect of the fall in flow stress value of the material at higher temperature than the reduction in conductivity.
A Constitutive Model and Data for Metals Subjected to Large Strains, High Strain Rates and High Temperatures.
Online since: January 2014
Authors: Yuan Chao He, Shi Wei Sun, Li Na Hao, Wen Lin Chen
Free damping layer structure has simple manufacturing process, so it is widely used for noise reduction of thin shell structure, such as the bulkhead structure [9].Figure 1 is free damping layer structure without force and bending force.
Table 2, The modal analysis results index frequency(Hz) Literature data correlative coefficient(α) Literature data Damping ratio(γ) Literature data 1 36.927 37.35 2.220786959E-02 0.022193 3.066364937E-03 3.0378e-3 2 182.69 183.89 -1.201477491E-10 4.521982e-10 2.420393580E-04 2.41355e-3 3 231.28 236.43 -3.568556785E-03 -0.003629 3.058628006E-03 3.0071e-3 4 647.10 674.45 1.282789507E-03 0.001324 3.047432180E-03 2.95885e-3 5 1131.5 1141.64 6.492494067E-13 -7.654285e-12 2.925429949E-04 2.878e-3 6 1266.9 1344.15 -6.577335128E-04 -6.254533e-12 3.035573647E-03 2.4559e-3 By using the weighted average algorithm: (4) Figure out the loss factor of the free layer damping sheet with one fixed end according to the modal damping ratio of each order and participation factors.
[10] Tan Feng.: Analysis and Optimization of Viscoelastic Damping Structures in Vibration Noise Reduction, Shanghai JiaoTong University, (2010) [11] Cao Yinping, Shi Xiuhua, Shao Xin.: Finite Element Analysis of Vibration Characteristics of Damped Composite Cantilever Beams, Computer Simulation, (2009)
Online since: March 2014
Authors: Li Siang Luo, Chun Ching Hsiao
The sensitivity of the fabricated ZnO gas sensors had a more outstanding performance about 49%, compared to the literature data reported by Joshi.
Moreover, the AD method can achieve fine patterning [7-8] and fabricate a dense structure by the reduction of crystallite size by fracture or plastic deformation at room temperature [5-6].
Table 1 Experimental parameters for the ZnO film deposited by the AD Item Data Starting powder ZnO (530nm in average diameter) Pressure difference between deposition and aerosol chambers 140 (Torr) Carrier gas Nitrogen Consumption of carrier gas 3 (L/min) Orifice size of nozzle 0.4×10 (mm×mm) Substrate temperature 25 (℃) Deposition area 70×70 (mm×mm) Distance between nozzle and substrate 5 (mm) Scanning rate 10 (mm/s) Deposition rate 8.2 (nm/s) Sensor preparation and measurement The ZnO gas sensor comprised a substrate with a silicon nitride layer, a heater (Pt/Ti), a pair of comb-like electrodes and a porous ZnO sensing film, as schematically depicted in Fig. 1.
This automatic measurement of gas sensing system mainly used NI LabVIEW system consisted of a case of NI PXIe-1082, a controller of NI PXIe-8135, a data acquisition card of NI PXIe-6366 and a software of NI LabVIEW 2012.
The sensitivity of the fabricated sensors had a finer performance about 49%, compared to the literature data reported by Joshi.
Online since: October 2010
Authors: Xiu Li, Hong Bing Zhu
Based on probability distribution of the residual strength of concrete under fatigue loading, the P-R-N curves are obtained based on test data, the empirical expressions of the residual strength corresponding to the number of cycles were obtained.
Fatigue life data of specimens subjecting to stress S, the initial compressive strength of specimens and the residual strength of the unfailed specimens are all listed in Table 1.
All the data are listed in increasing order of magnitude.
The probabilistic distribution of the fatigue residual strength is found out, the P-R-N curves are obtained based on test data, the curves can be used to predict the residual strength with reliability.
Q20091119), also supported by Wuhan University of Science and Technology Research Center of Green Manufacturing and Energy-Saving & Emission Reduction Technology (contract No.
Online since: October 2012
Authors: Dong Feng Zhao, Shi Li, Jian Liang Xue, Chan Chan Shen
This paper would provide a very useful reference for the high-salinity wastewater reduction via MED process in petroleum refinery.
This paper would provide a very useful reference for the high-salinity wastewater reduction via MED process in petroleum refinery.
Table 1 The datum of the high salinity wastewater and design conditions of MED process Parameters concentration The mass of the high salinity wastewater, t/h 31.5 The concentration of the salinity ,mg/L 6400 pH 6-9 Temperature of wastewater ,℃ 15 The diameter of the evaporator heat exchange tube, mm 25 Maximum mass of feed steam, t/h 10 Maximum mass of making up wastewater feed, t/h 100 Desired maximum mass of distilate, t/h 31 thermal utilization ratio of the device ,% 98 Brine reject salinity, g/l 70 The analysis has been divided into two separate tasks: (1) Consider the effect of temperature of feed steam effect numbers in the system
Online since: February 2014
Authors: Zhi Yang Li, Hong Jun Ni, Xiao Mei Wang, Yu Zhu, Ming Yu Huang
After data was be handled, which was used to reconstruct 3D entity in Pro/E software.
And reverse engineering’s key technologies were data acquisition, data processing and model reconstruction[4], as shown in Figure 1 was the reverse engineering to the physical ashtray product.
Data points on the surface of a solid surface were measured by three-coordinate measuring machine in this experiment[5].
(1) The model should be measured and the measuring path should be planned before the data of CMM was collected.
Then, the ashtray solid modeling will be completed after Editing and modifying the measured data points
Online since: December 2012
Authors: Max Lu, Jorge Norberto Beltramini, Muxina Konarova
Hydrogen desorption data revealed that samples prepared at 2 hour could release hydrogen at lower temperature (343°C) than those samples prepared at 30 min and 1 hour.
In practice reduction of particle size was achieved through high energy ball-milling [13, 14], nano-confinement of MgH2 in carbon template[15], melt-infiltration[16], chemical vapor deposition[17], hydrogen plasma metal reaction[18], salt reduction[14] and solvated atom dispersion[19].
Online since: September 2015
Authors: Ahmad Farid Abidin, Ismail Musirin, Muhamad Hatta Hussain, S.R.A. Rahim
DOCRs coordination requires the optimal values of Time Multiplier Setting (TMS) whereas the pickup current (Ip) values are based on load and data fault.
In terms of total TSM’s, MSFA technique demonstrates 9.64% time reduction compared to PSO.
The obtained relay settings results to the flexibility of the technique towards reduction of DOCRs operating time as well as avoiding miscoordination for each pair of relays.
Online since: October 2011
Authors: Ke Zhu, E. Pavithra
This paper deals with those disparate approaches, discussing exhaustively the process and application of hydroforming, providing sufficient data to make readers identify the burgeoning areas of research.
The implementation of the response surface, using the moving least square regression model aims to determine the optimal solution for the minimisation of thinning, reduction of underfilling and accuracy of the final fillet radius at the bulge zone corner [21].
Researchers can now think of cost reduction, thereby utilising this to the best extent possible, enabling batch and mass production.
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