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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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Three dimensional two phase flow in horizontal heated tube bundles has been investigated experimentally and simulated numerically.
针对卧式火管式蒸汽发生器的结构特点,对水平加热管束间的三维汽液两相流特性进行了实验研究。
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Condensation heat transfer characteristics is investigated for a horizontal tube bundle with non condensable gas.
通过对水平管束管间冷凝换热特性的试验研究,探讨并分析了冷却水流量以及不凝气体质量分数对管束冷凝换热的影响规律和机理。
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Resujts:① The distribution of lesions are mostly symmetrical, extensive, predominant in the middle and lower lung fields, and posterior areas in peripheral;② There are so many HRCT findings of lung, ILD is predominant: intralobular interstitial thickening 46 cases (100%), ground-glass opacity 41 cases (89.13%), peribronchovascular or centrilobular interstitial thickening 40 cases (86.96%), interlobular septal thickening 38 cases (82.61%), irregular linear opacity 37 cases (80.43%), small nodular opacity 34 cases (73.91%), subpleural line 27 cases (58.70%), bmnchiectasis or bronchiolectasis 19 cases (41.30%), patch opacity 18 cases (39.13%), expiratory mosaic sign 15 cases (32.61%), interface sign 14 cases (30.43%), honeycombing 12 cases (26.09%), emphysema or bulla 3 cases, cystic airspace suspected 1 case, and atelectasis suspected 1 case;③ Mediastinum and pleura: multiple small lymphonodi in mediastinum 41 cases (89.13%), pleural thickening or rough 38 cases (82.61%), esophagoectasis 11 cases (23.91%), unilateral little pleural fluid 1 case, and mediastinal emphysema 1 case.
结果:①皮肌炎肺部病变分布呈对称、广泛、偏中下、偏外后的特点;②肺部HRCT表现多样,以肺间质性改变为主:小叶内间质增厚46例(100%),磨玻璃影41例(89.13%),支气管血管束增宽或小叶核心增大40例(86.96%),小叶间隔增厚38例(82.61%),不规则纤维索条影37例(80.43%),结节影34例(73.91%),胸膜下线27例(58.70%),支气管或细支气管扩张19例(41.30%),斑片影18例(39.13%),呼气相马赛克征15例(32.61%),界面征14例(30.43%),蜂窝影12例(26.09%),肺气肿或肺大泡3例,单纯囊状气腔1例,肺不张l例;③纵隔及胸膜:纵隔小淋巴结影41例(89.13%),胸膜增厚或毛糙38例(82.61%),食管扩张11例(23.91%),单侧少量性胸腔积液1例,纵隔气肿1例。
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In the experiments,a single-fibre optical probe was developed to measure the local void fraction and a tri-fibre optical probe was developed to measure the vapor bubble velocities inside the heated tube bundles.
摘 要:针对卧式火管式蒸汽发生器的结构特点,对水平加热管束间的三维汽液两相流特性进行了实验研究。
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In general, the working pressure of steam is not more than 0.8 Mpa and the temperature of air will be below 150℃. The wing radiator consists of three rows of paratactic screw wing pipe mainly. The paratactic screw wing pipe is made through winding 05*10mm of steel belt onto 18mm steel pipe and then zinc hot galvanized. It can also be made with full stainless steel pipe and belt. Model SRL radiator is made of steel pipe and aluminum belt through rolling. Its radiation area in unit length is more than Model SRZ.
翅片式散热器主要由空气流向间的三排并列螺旋翅片管束组成,SRZ型散热翅片管束的加工工艺是反0.5*10毫米的钢带用机械绕片方法,绕在18毫米无缝钢管上,然后进行热镀锌,也可用不锈钢管及不锈钢带制成全不锈钢散热器,SRL型散热器则是用钢管和铝带轧制的翅片散热器,其单位长度的散热面积比SRZ型的更大。
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The density functional theory is used to estimate hydrogen adsorption in single-walled carbon nanotube arrays.
作者利用密度泛函理论计算了氢气在单壁碳纳米管束(SWNTs中管内和管间的吸附。
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Interbank:管排间的, 管束间的
institution n.公共机构, 协会, 制度 | interbank 管排间的, 管束间的 | affiliate v.(使...)加入, 接受为会员