http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Chenfeng Qiao,Jing Yu,Shuai Zhang,Zhengda Liu,Jinlong Wang 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
Fe-based alloy coating was laser cladded on gray cast iron using Ni-Cu alloy as an intermediate layer. The cross section ofthe laser cladded coating was characterized by optical microscopy (OM), scanning electron microscopy (SEM) equippedwith energy dispersive spectrometry (EDS), X-ray diffraction (XRD), and a Vickers hardness tester. A microdimple texturewas created by reciprocating an electrolyte jet with prefabricated mask (REJP) machining on an Fe-based alloy coating. Thetribological performances of untextured and textured coatings were examined through interrupted wear tests using an in-housedeveloped reciprocating ball-on-plate tribotester under dry sliding and starved lubricated conditions. The results show thatthe presence of microdimple edges in the nonconformal contact region has a detrimental effect on the friction performanceunder dry sliding. However, the microdimples can be beneficial for trapping debris to preserve a smoother contacting surfaceand thus a lower volume wear track compared to untextured coatings. Due to its role in oil reservoirs and debris entrapment,the microdimple textured coating can maintain a low friction coefficient for a long time period after lubricant oil cutoff andresults in a lower volume wear track under starved lubrication.
Guohua Wu,He Zhou,Tonggang Zhao,Hongzhan Liu,Zhengda Li,Xin Zhao 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.6
A model for electromagnetic multi-Gaussian Schell-model beams is introduced. An analyticalexpression for the cross-spectral density matrix of electromagnetic multi-Gausssian Schell-model(EMGSM) beams propagating through non-Kolmogorov turbulence is derived based on the extendedHuygens-Fresnel principle. With help of this expression, the average intensity, degree of coherence(DOC) and degree of polarization (DOP) of EMGSM beams are investigated in detail. Our resultsshow that by suitable choices of the source parameters, the distance that preserve a flat profile canbe prolonged. The effects of M and exponent value on DOC and DOP of EMGSM beams arestudied in detail.