Because the positron annihilation spectroscopy can directly show the information of the defects in the materials, we have measured the positron life of the gallium arsenide samples of different surface roughness. And we have discussed the effect of the surface topography on the positron life.

因?yàn)檎娮愉螞](méi)譜測(cè)量能直接給出缺陷的信息，我們用正電子壽命譜測(cè)量不同表面粗糙度的GaAs樣品美女AAAAAA一级毛片，討論了表面形貌對(duì)常規(guī)正電子壽命測(cè)量結(jié)果的影響。

ABSTRACT In this paper, integrated with surface topography, asperity contact behaviour and fluid mechanics, the lubrication of real enginee...

本文結(jié)合實(shí)際工程表面的形貌特征久久精品就只有精品99、表面微凸體接觸力學(xué)性質(zhì)和潤(rùn)滑力學(xué)性質(zhì)對(duì)粗糙表面的潤(rùn)滑及摩擦特性進(jìn)行了系統(tǒng)的實(shí)驗(yàn)研究和理論分析夜间福利在线看黄。

Under the basis of fracture topography analysis, the micro-contact model of asperity and the contact process between two fracture surfaces have been studied.

在裂縫拓?fù)涮匦詤?shù)分析的基礎(chǔ)上，對(duì)裂縫接觸的微觀彈性模型和自然裂縫的實(shí)際接觸過(guò)程進(jìn)行了深入地分析福利影院你懂的。

ABSTRACT In this paper, integrated with surface topography, asperity contact behaviour and fluid mechanics, the lubrication of real engineering surfaces and their rubbing behaviour are described in experiment and theory.

本文結(jié)合實(shí)際工程表面的形貌特征久久青草视频永久看、表面微凸體接觸力學(xué)性質(zhì)和潤(rùn)滑力學(xué)性質(zhì)對(duì)粗糙表面的潤(rùn)滑及摩擦特性進(jìn)行了系統(tǒng)的實(shí)驗(yàn)研究和理論分析。

Based on measured surface topography in conjunction with theoretical analysis, the characteristics of surface during wear process are studied, and the asperity density and asperity curvature radius are given for the first time.

本文通過(guò)對(duì)缸套表面的實(shí)測(cè)和分析国产欧美乱伦，研究了在磨損前后表面形貌的變化视频,国产精品，并首次定量描述了微凸體密度、微凸體曲率半徑及其沿高度方向的變化欧美真人一级99。

Methods In 390 eyes of 197 cases with spherical equivalent refraction between -0.75~-16.25 D and astigmatic -0.25~-4.00 D, the relationship between the dioptre and parameters of topography was analyzed.

年齡 18~51 歲的197例392眼日日爽日日操，等效球鏡為-0 75~-16 25 D欧美国产亚洲白丝一二三，散光度為-0 25~-4 00 D近視眼，對(duì)其屈光度及角膜地形圖各參數(shù)的關(guān)系進(jìn)行統(tǒng)計(jì)學(xué)分析2021国产拍精品系列观看。

It will meet the needs of western economic construction and carrying electricity from the west to the east. Because these stream segments are mostly in high mountain and barranca, their topography is precipitous and geological condition is complicated and the project scale is majesty.

由于這些河段大都處于高山峽谷77777青操网，其地形陡峻地質(zhì)條件復(fù)雜久久精品囯产AV，而且工程規(guī)模雄偉，需要建設(shè)一批高壩一区二区裸体，以形成大水庫(kù)九九热最新网址、大電站，作為國(guó)家重要的能源基地欧美日韩中国产视频。

For example, karst topography is very approach this mode. We not only discuss the effect relation of dipole field in the mediator, but also in the property of antenna. Imaginaries Bessel function is involved in the process of discussion. because it is very important to the result.

鉆孔雷達(dá)一般使用偶極天線日韩手机自拍无码AV，所以對(duì)偶極天線輻射場(chǎng)正反演問(wèn)題的研究是目前的當(dāng)務(wù)之急，它直接影響著對(duì)鉆孔雷達(dá)資料的正確解釋?zhuān)瑢?duì)進(jìn)一步研究鉆孔雷達(dá)天線的有關(guān)特性及鉆孔雷達(dá)的研制起著非常關(guān)鍵的作用黄色网站视频一区二区三区。

Internal tides (internal waves of tidal frequency) are generated, usually in the connecting area between shelf and slope, by the tide-topography interactions and they have many effects on biocoenosis and objects in the ocean.

海洋中的陸架坡折區(qū)是地形變化劇烈的區(qū)域之一，當(dāng)表面潮與這里的地形發(fā)生相互作用時(shí)免费a黄色片，在該區(qū)域?qū)踊暮Ｋ畠?nèi)部引起強(qiáng)烈的擾動(dòng)從而形成內(nèi)潮人人超碰人人操。

The buildings are embedded to varying degree within the rocky topography, and bluestone walls weave between architecture and landscape to reinforce their integration.

住宅坐落在多巖石的環(huán)境中国产首页在线视频，而住宅的藍(lán)砂巖墻壁將建筑和風(fēng)景結(jié)合在一起免费一级毛片在线播放放视频。