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In the single crystal of C60 with a FCC structure,positron mainly appears outside the C60 molecule.The main annihilation space is the interspace between molecules.The calculated positron bulk lifetime in C60 is 352ps, which agrees with experiment value of 356ps in literature.In carbon nanotube bundles with different dimeters,as the diameter of carbon nanotubes increases,the main space where positron appears changes from the interspace of carbon tubes to the space inside carbon tubes,the radio between positron annihilation with valence eletrons and core eletrons becomes larger,the positron bulk lifetime in carbon nanotube increase rapidly first and come to be a constant at the end.The calculated positron lifetime of carbon nanotube with a dimeter of 0.8~1.6ns is 332~470ps,which agrees with the experiment value of 394ps.Positron annihilation has been studied in widly used compound semiconductors.
计算结果表明:在片层结构的石墨晶体中,正电子主要在石墨层间的空隙中湮没,计算出的石墨中的正电子寿命为208 pS,与文献中的实验结果215 ps符合很好;在金刚石单晶中,正电子主要在碳原子之间的空隙中存在并发生湮没,计算出的金刚石中的正电子寿命为115 ps,文献中的实验结果110 ps左右符合;在面心立方结构的C60晶体中,正电子主要在C60分子球壳内外侧及分子之间存在,C60球形分子中心正电子分布很少,正电子的湮没区域集中在C60分子之间的空隙区域,计算出的C60中的正电子寿命为352 ps与文献中的实验结果356ps相符合;对于不同管径碳米管束中的正电子分布,随着碳纳米管直径的增加,碳纳米管束中的正电子由主要在碳纳米管管间的区域出现转变为主要在碳纳米管管内中心的区域出现:碳纳米管束中的正电子与碳原子的价电子的湮没概率变得越来越大,与核心电子的湮没概率变得越来越小;碳纳米管束中正电子的湮没寿命先迅速增大,而后趋于一定值。
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The natural lacunarity curve was firstly employed in the Hetian Oasis landscape pattern and the zigzag oasis sample for their spatial heterogeneity in multi-scales,and then the coherence and complementary validation was performed on the characteristic scale extraction of the Hetian Oasis by landscape lacunarity analysis and wavelet transformation.
结合遥感与GIS技术,首先利用标准空隙度曲线分析了和田绿洲景观及其"之"字形绿洲样带在多个尺度上的空间异质性特征,然后验证了空隙度指数和小波变换在提取绿洲景观特征尺度上的一致性与互补性。
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According to the experiment results of degradation in field, degradation mechanism of the biodegradable mulch film can include four stages: the first, the material surface appeared deficiency while the surface area and interstice increased of material in the action of natural environment and microorganism; the second, along with the surface area and interstice of material increased and the gap strengthened, the chemical chain of the high polymer's principal chain broke as a result of the hydrolysis or the enzymatic effect in the action of hydration, causing the molecular weight and mechanics function descended; the third, the molecular of high polymer split the low polymer after its physical mechanical function descended, the material decomposed the fragments, the mass defect intensified; the fourth, the low polymer of fragments form in the natural environment, the microorganism, the biological enzyme became the smaller fragments, thus absorbed by the phagocytes, or further turn into CO2 and H2O due to hydrolysis.
根据田间降解试验结果推测,生物全降解地膜的降解机理可能包括四个阶段:第一,在自然环境、微生物作用下,材料表面出现缺陷,同时表面积增大、空隙增多;第二,随着材料表面积的增大、空隙的增多,吸水性增强,在自水合作用下,高聚物主链由于水解或酶解而使化学链断裂,导致分子量和力学性能下降;第三,在其物理机械性能下降后,高聚物分子链断裂为低聚物分子,材料裂解为碎片状,质量损失加剧;第四,碎片状低聚物在自然环境、微生物、生物酶作用下进一步水解变成尺寸更小的碎片,从而被吞噬细胞吸收,或进一步水解,生成CO2和H2O。
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Because steam activation carbon has a narrower and more extensive microporosity than carbon dioxide activation carbon, stream is the only oxidising agent in this paper.
考虑到水蒸气活化活性炭比二氧化碳活化活性炭具有更小空隙结构和更宽的孔径范围,所以本文中只选用水蒸气作为活化剂对热解炭进行了活化。
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The topographical parameters have been analyzed by taking into account the thermal effect during the friction process. As the results, three kinds of typical topographical features have been observed for the worn surfaces of C G iron with various P content. Namely, C G iron with 0.05% P, 1.30% P, and 0.70% P show worn surfaces characterized by groove ridge, peak pits and their combined topography. The C G iron specimen with peak pits type worn surface topography showes the lowest wear rate and highest friction coefficient, while that with groove ridge type worn surface topography shows the highest wear rate and lowest friction coefficient. The groove ridge type worn surface has a relatively large value of surface height deviation and void volume ratio and negative large value of skewness, which is contrary to the peak pits topography.
结果表明:度销磨损表面主要呈现犁沟型、孤岛型及二者的混合型3种形貌特征,其中具有孤岛型磨损表面形貌特征的试样的摩擦系数较高,磨损率较低;而具有犁沟型磨损表面形貌特征的试样的摩擦系数最低,磨损率最高,分析表面形貌参数发现:犁沟型表面形貌具有最大的表面高度偏差和表面空隙率及高负值的表面高度分布参数;而孤岛型表面形貌的表面高度偏差和表面空隙率最小,表面高度分布参数为高正值。
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But the factor influencing the wicking velocity is the space rate of the fabrics. The small rate is quite helpful to capillary forces.
而影响导湿速度的主要是织物的空隙率,较小的织物空隙率有助于提高毛细管芯吸速率。
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Spherical granules are frequently observed in baculum with small intraexinous spaces, which is at initial developmental stage.
柱状层内空间较密实,内部空隙小,多由颗粒构成,处于小柱发育的初级阶段。
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What was observed under a light microscope included: tumor cells were mulberry and micropapillaryshaped or it was of glandule tubular arrangement; there was obvious interspace between cancer nest and neighboring areas; micropapillary was empty of fiber blood vessel axes; immunohistochemical staining showed EMA positive location was both at outward surface of glandule duct and at micropapillarylike cancer nest.
光镜下特征性表现为肿瘤细胞呈桑椹状、微乳头状或小腺管样排列,癌巢与周围间质形成明显的空隙。微乳头缺乏纤维血管轴心。免疫组化染色EMA阳性部位在癌细胞巢团或微乳头状、腺管的外表面。
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What was observed under a light microscope included: tumor cells were mulberry and micropapillary shaped or it was of glandule tubular arrangement; there was obvious interspace between cancer nest and neighboring areas; micropapillary was empty of fiber blood vessel axes; immunohistochemical staining showed ema positive location was both at outward surface of glandule duct and at micropapillary like cancer nest.
光镜下特征性表现为肿瘤细胞呈桑椹状、微乳头状或小腺管样排列,癌巢与周围间质形成明显的空隙。微乳头缺乏纤维血管轴心。免疫组化染色ema阳性部位在癌细胞巢团或微乳头状、腺管的外表面。
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To combat this aerodynamicists need to speed up the flow near the wings surface, to do this they split the wing into separate elements, this creates a slot.
为了改善这种状况,空气动力设计者把尾翼分成了独立的几片小翼,小翼中间留出了一点空隙,尾翼上表面的高压气流通过这些缝隙流到了下表面,这样就加速了翼下气流的速度。
- 更多网络解释与小空隙的相关的网络解释 [注:此内容来源于网络,仅供参考]
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cantlet:小部分, 小段
cantle | 鞍尾, 截剩的一片 | cantlet | 小部分, 小段 | cantline | 绳索外部股间空隙
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bone lacuna:骨陷窝
胞体所在空隙称骨陷窝(bone lacuna),突起所在的空隙称骨小管. 骨细胞胞体呈扁椭圆形,胞质嗜碱性,表面有细小的突起,相邻骨细胞的突起以缝隙连接相连,骨小管则彼此连通(图5-4). 骨陷窝和骨小管内含少量组织液,可营养骨细胞和输送代谢产物.
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areolate:小空隙的;网眼状的
areo?hydro?elasticity 气?液?弹性 | areolate 小空隙的;网眼状的 | areolation 形成网眼状空隙;网眼状结构
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areolated:网眼状的;小空隙的
areolat 网眼状的;小空隙的 | areolated 网眼状的;小空隙的 | areolation 形成网眼状空隙
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areolation:形成网眼状空隙;网眼状结构
areolate 小空隙的;网眼状的 | areolation 形成网眼状空隙;网眼状结构 | areometer 比重计
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areolation:形成网眼状空隙
areolated 网眼状的;小空隙的 | areolation 形成网眼状空隙 | areometer 液体比重计
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cellulated:细胞的;蜂窝状的
cellulase 纤维素酶 | cellulated 细胞的;蜂窝状的 | cellule 小细胞;空隙
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lacunose:多孔的 (形)
lacunary 有孔的; 空隙的 (形) | lacunose 多孔的 (形) | lacunule 小孔; 小陷窝 (名)
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perivascular space:血管周隙
富含血管.在软膜外表面和蛛网膜的外,内表面以及小梁的表面均被覆有单层扁平上皮,软膜的血管供应脑及脊髓.血管进入脑内时,软膜和蛛网膜也随之进入脑内,但软膜并不紧包血管,血管与软膜之间仍有空隙,称血管周隙(perivascular space),与蛛网膜下隙相通,
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Rose Quartz:玫瑰水晶
J.蜡的注入(Wax Impregnations):以蜡加热,用以填充宝石的裂缝或小空隙,例如土耳其石(Turquoise)以蜂蜡(Paraffin1.玫瑰水晶(Rose Quartz)偶而以放射来增进颜色,或是藉由放射无色水晶,以产生颜色,就像加深水晶的颜色一般.