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Growth mechanisms of interfacial carbides in solid-state reaction between single-crystal diamond and chromium

Journal of Materials Science & Technology 2023年第13期144卷 138-149页

作者： Zhuo Liu Wei Cheng dekui mu Qiaoli Lin Xipeng Xu Han Huang Institute of Manufacturing Engineering Huaqiao UniversityXiamen 361021China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730000China School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQLD 4072Australia

Interfacial bonding is one of the most challenging issues in the fabrication,and hence comprehensively influences the properties of diamond-based metal matrix composites(MMCs)*** this work,solid-state(S/S)interface reaction between single-crystal synthetic diamond and chromium(Cr)metal was critically examined with special attention given to unveil the role of crystal orientation in the for-mation and growth of interfacial *** has been revealed that catalytically converted carbon(CCC)was formed prior to chromium carbides,which is counterintuitive to previous *** 7 C 3 was the first carbide formed in the S/S interface reaction,aided by the relaxation of diamond lattices that re-duces the interfacial *** Cr 7 C 3 and Cr 3 C 2 carbides were formed at 600 and 800℃,respectively,with the growth preferred on diamond(100)plane,because of its higher density of surface defects than(111)*** strain distribution was quasi-quantitively measured using windowed Fourier Transform-Geometric Phase Analysis(WFT-GPA)analysis and an ameliorated strain concentration was found after the ripening of interfacial *** morphologies of Cr_(3)C_(2) grown on diamond(100)and(111)planes were perceived after S/S interface reaction at 1000℃,which is reported for the first *** underlying mechanisms of Cr-induced phase transformation on diamond surface,as well as the crystal orientation dependent growth of interfacial carbides were unveiled using the first-principles *** formation and growth mechanisms of Cr_(3)C_(2) were elucidated using SEM,TEM and XRD ***,an approach for tailoring the interfacial microstructure between synthetic diamond and bonding metals was proposed.

关键词： Solid-state Interface reaction Synthetic diamond Phase transformation Chromium carbide

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Spatial correlations in time and frequency domains between chlorophyll-a concentration and environmental factors in the Bohai Sea

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Journal of Oceanology and Limnology 2024年第4期42卷 1143-1156页

作者： Wan XU Di mu Zhenteng YANG dekui YUAN Department of Mechanics Tianjin UniversityTianjin 300350China Engineering Research Center of Seawater Utilization of Ministry of Education School of Chemical Engineering and TechnologyHebei University of TechnologyTianjin 300130China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China

Based on the reconstructed MODIS data and ECMWF reanalysis data from 2003 to 2021,spatial correlations between chlorophyll a(Chl a)and sea surface temperature(SST),photosynthetically available radiation(PAR),aerosol optical thickness(AOT),and wind speed(WS)in the Bohai Sea were analyzed from the perspective of time domain and frequency *** indicate that the frequency domain analysis was more conducive to revealing the correlations between Chl a and environmental *** spatial pattern of time-domain correlations was similar to the isobaths of the Bohai Sea,which was positive in shallow waters and negative in deep waters for SST,PAR,and AOT,and was reversed for ***-domain correlations were obtained by performing Fourier Transform and were higher than correlations in time *** spatial distributions indicated that the effects of SST and PAR on Chl a were greater than AOT and WS in the Bohai ***,cross-spectrum analysis was applied to explore the response relationships.A depth-dependent pattern was shown in correlations and time lags,indicating that the influential mechanism of environmental factors on Chl-a concentration is related to seawater depth.

关键词： chlorophyll a(Chl a) frequency domain spatial correlation Bohai Sea

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Deformation and removal of semiconductor and laser single crystals at extremely small scales

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International Journal of Extreme Manufacturing 2020年第1期2卷 109-133页

作者： Yueqin Wu dekui mu Han Huang School of Mechanical and Mining Engineering The University of QueenslandQLD 4072Australia Institute of Manufacturing Engineering Huaqiao UniversityXiamen361021People’s Republic of China

Semiconductor and laser single crystals are usually brittle and hard,which need to be ground to have satisfactory surface integrity and dimensional precision prior to their *** of the surface integrity of a ground crystal can shorten the time of a subsequent polishing process,thus reducing the manufacturing *** development of cost-effective grinding technologies for those crystals requires an in-depth understanding of their deformation and removal *** a result,a great deal of research efforts were directed towards studying this topic in the past two or three *** this review,we aimed to summarize the deformation and removal characteristics of representative semiconductor and laser single crystals in accordance with the scale of mechanical loading,especially at extremely small *** removal mechanisms were critically examined based on the evidence obtained from highresolution TEM *** relationships between machining conditions and removal behaviors were discussed to provide a guidance for further advancing of the grinding technologies for those crystals.

关键词： deformation and removal semiconductor laser crystal transmission electron microscopy(TEM) grinding

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解痉散瘀汤对椎动脉型颈椎病患者椎-基底动脉血流速度和脑血流量的影响

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现代中西医结合杂志 2021年第22期30卷 2418-2422页

作者：康晓乐鹿洪辉李德魁戴爽马小芳穆晓红北京中医药大学北京100029 北京中医药大学东直门医院北京100700

目的观察解痉散瘀汤对椎动脉型颈椎病患者椎-基底动脉血流速度和脑血流量的影响。方法选取2018年3月—2019年12月北京中医药大学东直门医院收治的64例椎动脉型颈椎病患者,按照随机平行分组法分为对照组与观察组各32例。对照组应用盐酸... 详细信息

目的观察解痉散瘀汤对椎动脉型颈椎病患者椎-基底动脉血流速度和脑血流量的影响。方法选取2018年3月—2019年12月北京中医药大学东直门医院收治的64例椎动脉型颈椎病患者,按照随机平行分组法分为对照组与观察组各32例。对照组应用盐酸氟桂利嗪胶囊以及尼莫地平片进行常规治疗,观察组在对照组治疗基础上加用解痉散瘀汤治疗。2组均连续治疗4周,观察2组治疗前后眩晕症状评分,中医症状积分,左椎动脉、右椎动脉、基底动脉收缩期峰值血流速度(Vs)、舒张期血流速度(Vd)以及平均脑血流量变化情况,评估2组治疗后效果,并随访1年观察2组复发情况。结果治疗后2组患者左椎动脉、右椎动脉、基底动脉Vs、Vd均较治疗前加快(P均<0.05),平均脑血流量均较治疗前明显升高(P均<0.05),观察组各项指标均明显快于或高于对照组(P均<0.05);治疗后2组中医症状积分及眩晕评分均较治疗前明显降低(P均<0.05),观察组各项评分均明显低于对照组(P均<0.05);观察组治疗总有效率为93.8%(30/32),明显高于对照组的78.1%(25/32),观察组复发率为3.1%(1/32),明显低于对照组的28.1%(9/32),差异均有统计学意义(P均<0.05)。结论应用解痉散瘀汤对椎动脉型颈椎病患者进行治疗,可明显改善椎-基底动脉血流速度和脑血流量,缓解临床症状,疗效确切。

关键词：解痉散瘀汤椎动脉型颈椎病椎-基底动脉脑血流量

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小麦叶面喷洒多效唑效应的研究

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山东科学 1993年第4期6卷 41-46页

作者：秦月秋杨德奎王法宏赵君实山东师范大学生物系济南250014 山东农业科学院作物所济南250100

小麦于幼穗分化的二棱期,叶面喷洒适当浓度的多效唑溶液,能显著地增加亩穗数和穗粒数,每亩增产17.7％。对小麦生长和茎叶结构也有其明显影响,抑制了茎细胞的伸长生长,导致节间缩短,植株矮化。茎壁厚度增加,茎秆内维管束数增多,叶片变厚... 详细信息

小麦于幼穗分化的二棱期,叶面喷洒适当浓度的多效唑溶液,能显著地增加亩穗数和穗粒数,每亩增产17.7％。对小麦生长和茎叶结构也有其明显影响,抑制了茎细胞的伸长生长,导致节间缩短,植株矮化。茎壁厚度增加,茎秆内维管束数增多,叶片变厚,叶肉内多环细胞数目增多。叶绿体的超微结构表现,基粒片层数目减少,基质片层也较稀疏,对叶绿体的发育有一定抑制作用。

关键词：小麦多效唑茎壁厚度叶绿体

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