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Online since: May 2007
Authors: Jian Zhong Zhou, Ai Xin Feng, Yong Kang Zhang, Xu Dong Ren
Instruction Laser shock processing (LSP) is a promising surface treatment technique and has been shown to be effective in improving the fatigue properties of a number of metals and alloys.
And residual stress was found to have a significance dependence on the coating grain result to the different effect of LSP.
Tab 2.Surface stress in 6061-T651 at three different coatings in LSP Sample number Coatings Laser power density �GW/cm2� Surface maximum stress�MPa� Sample 1 Without coating 3.31 +89.7 Sample 2 Aluminum foil 3.31 -224.9 Sample 3 Black paint 3.31 -280.1 Sample 4 Silica acid paint 3.31 -320.0 Moreover, if the coating material is correctly chosen, the stresses transmitted to the substrate target can be increased due to mismatch impedance effect.
Online since: April 2021
Authors: Olga V. Belousova, Ksenia V. Kostina
Main Body While the electrolyzer operates a number of secondary products in the form of gas, dust or solid waste are removed from it [5].
At the same time, mass losses during the process of CO2 formation were detected, as well as the number of crumbled coke grains.
Online since: September 2014
Authors: Da Peng Huang, Yu Qi Kan, Shao Jun Zhang
(e) In order to reduce the number of welding lines and in-service inspection, large-scale components are pursued.
(e) To the austenitic stainless steel tube, considering its risk to stress corrosion, intergranular corrosion, residual stress testing and austenite grain size checking need to be done.
China's nuclear power due to a late start, but has not yet established a set of nuclear material system is a unified, complete nuclear power standards and their own, which requires us to speed up the pace, through a large number of experimental studies, compared with the foreign mature nuclear materials, nuclear material eventually formed our own, build my our own nuclear materials and nuclear power standard system.
Online since: June 2015
Authors: R.A. Mamadaliev, V.N. Kuskov, U.D. Zemenkov, A.A. Popova
Polished sections for further studies were made on sandpaper of various grain sizes, with a 900 angle change of grinding direction each time the sandpaper was changed.
180 Cr Ccr = -3E-07qef 2 - 0,0018qef + 20,16 R² = 0,9407 Ni CNi = -2E-08qef 2 + 9E-05qef + 0,2679 R² = 0,8005 Mn CMn = -4E-09qef 2 + 6E-05qef + 0,291 R² = 0,9739 OK 61.30 VDU- 506 Cr Ccr = 3E-07qef 2 - 0,0017qef + 20,94 R² = 0,9801 Ni CNi = 2E-07qef 2 - 0,0009qef + 10,653 R² = 0,9569 Mn CMn = -5E-08qef 2 + 0,0003qef + 0,428 R² = 0,997 Handy TIG 180 Cr Ccr = -5E-07qef 2 + 0,0014qef + 18,391 R² = 0,869 Ni CNi = 3E-07qef 2 - 0,0012qef + 10,793 R² = 0,9282 Mn CMn = -5E-09qef 2 + 8E-05qef + 0,6787 R² = 0,8945 OZL - 8 VDU- 506 Cr Ccr = 3E-07qef 2 - 0,0012qef + 18,269 R² = 0,9901 Ni CNi = 4E-07qef 2 - 0,002qef + 11,124 R² = 0,984 Mn CMn = -6E-07qef 2 + 0,0026qef - 0,8583 R² = 0,9469 Handy TIG 180 Cr Ccr = 3E-07qef 2 - 0,0007qef + 17,56 R² = 0,9042 Ni CNi = 1E-06qef 2 - 0,0052qef + 14,998 R² = 0,9998 Mn CMn = -6E-08qef 2 + 0,0008qef + 0,2621 R² = 0,9165 When the amperage is increased to 120 A while using an inverter power source, a significant reduction in electrode consumption and in the number
In particular, the number of electrodes to fill the joint reduced to 5 against 7 used when welding with a VDU-506 electronic arc welder.
Online since: November 2015
Authors: Ioan Doroftei, Viorel Goanta, Adriana Savin, Paul Doru Barsanescu, Liviu Andrusca
First is ensuring satisfactory dimensions of specimens, in order to obtain independent information on the particularities of different crystalline grains of the material and a high precision displacement measurement.
(1) where n is the total number of links (including the referential one), C5 is the number of joints (all of them with one degree of freedom).
Online since: March 2011
Authors: Christian Brylinski, Jean Claude Viala, Olivier Dezellus, Nicolas Thierry-Jebali, Olivier Ménard, Arnaud Yvon, Miao Zhe, Emmanuel Collard
Table1: Annealing conditions and SCR values of TiAlSi contacts Sequence number Schematic sequence Annealing conditions SCR [Ω.cm²] Sequence number Schematic sequence Annealing conditions SCR [Ω.cm²] S0 450 °C, Ar,1’ 600 °C, Ar,1’ 600 °C, Ar,3’ 800 °C, Ar,1’ 6.2e-5 2e-5 2.7e-5 3e-5 S2 450 °C, Ar, 1’ 600 °C, Ar, 3’ 1.5e-4 2.7e-4 S1 450 °C, Ar, 1’ 600 °C, Ar, 1’ 600 °C, Ar, 3’ 800 °C, Ar, 1’ 4.4e-5 Non ohmic Non ohmic Non ohmic S3 600 °C, Ar, 3’ Non ohmic Results and discussions Before annealing, all contacts are non-ohmic.
Indeed, previous studies [9] showed that Al can diffuse into Ti layer along the grain boundaries, resulting into a nano-layered structure and finally reacting to form Al3Ti.
Online since: March 2011
Authors: Ned J. Ianno, Noel T. Lauer, Rodney J. Soukup, James Huguenin-Love
As each SiC nucleation island spans its central void, the number of available Si atoms emanating from the void dwindles to zero, at which point new voids are created to sustain further buffer layer coverage.
Unfortunately, this also provides extra time at a high temperature for the voids to increase in number and congregate, increasing the distance over which the buffer layer must span, unsupported.
The FESEM images and XRD patterns indicate that the film takes on a similar structure to that of the buffer layer which is multi-grained but highly textured growth.
Online since: February 2004
Authors: W.B. Rowe, Michael N. Morgan, A. Batako
The importance of convection to the abrasive grains, chips and the fluid is presented to explain thermal behaviour in HEDG.
The heat source is the sum of an infinite number of moving line sources disposed around the contact arc.
Table 1 Comparison of estimated and measured temperatures in grinding Process / Parameter Shallow Creep Creep HEDG Source of data Black [10] Kim [8] Ohishi [9] Rowe [5] depth of cut, mm 0/012 0.5 1 0.96 wheel diam., mm 200 350 305 170 workspeed, m/s 0.3 0.005 0.0006 0.3 contact length, mm 3.10 13.2 17.5 12.8 contact time, s 0.01 2.65 29.1 0.043 L=Peclet number 27 1.6 0.15 103 remov.rate.width mm 2/s 3.6 2.5 0.6 288 spec. energy, J/mm 3 60 67 190 11.0 power/width, W/mm 216 168 114 3168 qt=power/area, W/mm 2 69.7 12.7 6.53 248 PHI, degrees 0.22 2.17 3.28 4.31 C=workpiece HT factor 1.1 1.04 0.81 0.75 abrasive type cBN alumina alumina alumina Rws: subsystem partition 0.46 0.88 0.85 0.89 hw, W/m 2 K 104214 8325 3277 75274 process fluid emulsion emulsion oil emulsion hf, W/m 2K 10000 290000 23000 290000 qch=hch.Tmp, W/mm 2 6.9 1.1 0.18 184 Tmax – dry, oC 275 1222 1641 763 Tmax – wet, oC 264 38 236 172 Tmax – measured, oC 320 40 260
Online since: September 2013
Authors: Wen Quan Zhang, Kai Zhao, Zhi Da Liu, Guang Peng Zhang, Pei Cong Sun
The thickness of 8# coal seam is 0.73~2.98m, with an average of 1.90m, coal bed structure is relatively simple. 8# coal seam is mainly affected by the lower five gray confined water disasters threated, the distance from five gray to the 8# coal seam is 22.5~43.18m, the average is 33m, grey qualitative pure dense thick bedded fine grained crystalline limestone the karst fissure development, Currently five gray level is +33.92m, the unit water inflow q=0.0017~16.12 . has stronger hydrogeology and water quality type belongs to the heavy magnesium chloride calcium carbonate with water.
I known weight of the sample point to the unknown sample, n is the number of the known sample points.
Acknowledgments This research was sponsored by Shandong Province Natural Science Foundation (grant number ZR2012EEM017).
Online since: February 2014
Authors: Shi Guang Mu, Guo Zhong Zou, Jin Rong Bai
A recent trend in malware production is to generate large numbers of variants at increasingly rapid rates.
While the idea of dynamic malware analysis itself is not new, we leverage this information to obtain a number of novel, important features that better capture the behavior of a malware program.
As can be seen from Table 2, by classifying malware variants, we can study of the evolution trend and variation direction of the malware in coarse-grained way.
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