反应介质对二氧化硅在碳球表面包覆效果的影响

为了改善碳球表面惰性,利用溶胶-凝胶法在碳球表面包覆二氧化硅,考察了介质条件对包覆效果的影响。通过场发射扫描电子显微镜和透射电子显微镜等手段对不同介质中得到的样品进行对比分析表征。结果表明,碱性介质更有利于二氧化硅在碳球表面的包覆,所得复合物球表面光滑、包覆层厚且厚度均一,焙烧除去碳球核后得到空心二氧化硅球,并分析了碳球表面二氧化硅的包覆机理。     

Peculiarities of Monitoring the State of a Flowing Medium by the Method of Nuclear Magnetic Resonance

Technical Physics Letters - Specific features of monitoring the state of a flowing medium by method of nuclear magnetic resonance (NMR) are considered. An approach to studying the state of a...     

AlCuFe准晶与纯Al的界面反应

分析了压铸的纯Al-AlCuFe准晶复合材料的界面反应行为,以及原始铸态的AlCuFe准晶组织,发现复合材料的界面反应行为与铸态AlCuFe准晶的原始组织有着密切的关系。要获得良好的界面,必须控制好铸态AlCuFe准晶及其类似相的相对含量和组织形态。     

The Peculiarities of Americium Electronic Structure and Magnetic Susceptibility

By implementing a self-consistent procedure that combines the calculations of electronic spectrum within LDA+U+SO approximation with a generalized spin-fluctuation s(p)df-model, we have calculated the densities of states and temperature dependence of magnetic susceptibility of Americium. It was revealed that in the vicinity of the Fermi energy the densities of states of Am d-electrons become comparable to its f-electron densities of states that leads to that both bands make comparable contributions to the spin magnetic susceptibility. It is shown that the unusual transition from Curie-like to Pauli-like magnetic susceptibility, which is observed in Am, is caused by coexistence in Am of electronic states of two types—the localized, responsible for the formation of Curie-like susceptibility and the itinerant, which lead to temperature-independent magnetic susceptibility.     

钛酸铝材料的结构、热膨胀及热稳定性

详细回顾了关于铁酸铝材料结构、热膨胀和热稳定性的研究。A12TiO5属于正交晶系假板钛矿结构。其晶格热膨胀各向异性行为,导致多晶铁酸铝陶瓷材料的微裂纹化,从而具有低膨胀、低热导率和优良的抗热震性等特性。但Al2TiO5低温下属于动力学稳定态,当温度低于1280℃易于分解为α-A12O3和金红石型TiO2。引入异质同构的化合物MgTi2O5或Fe2TiO5固熔于A12TiO5晶格,可以降低热力学分解温度和增加结构熵,有效地抑制Al2TiO5的分解。Al2TiO5在还原气氛下的分解机理上不明确,需要进一步的研究。     

Mechanical and Abrasive Wear Properties of Anodic Oxide Layers Formed on Aluminium

Aluminium oxide coatings were formed on aluminium substrates in oxalic acid-sulphuric acid bath.Abrasion tests of the obtained anodic layers were carried out on a pin-on-disc machine in accordance with the ISO/DP 825 specifications.The Vickers microhardness,D(HV0.2),and the abrasion weight loss,Wa(mg) were measured.Influence of oxalic acid concentration(Cox),bath temperature(T) and anodic current density(J) on D and Wa has been examined,and the sulphuric acid concentration(Csul) was maintained at 160 g·L-1....     

Peculiarities of Milligram Mass Acceleration in Electromagnetic Railguns with an External Pulsed Magnetic Field

Technical Physics Letters - Solid polycarbonate impactors were accelerated in a channel of electromagnetic railgun to which an external pulsed magnetic field was applied. The channel was filled...     

Investigation of Parameters of the Ion Beam Formed in Crossed Electric and Magnetic Fields

The results of experimental investigations of the characteristics of the positive ion beam formed in an ionplasma system with discharge generation in crossed electric and magnetic fields are presented. The conditions for the discharge formation and the specific features of the developed configuration of the discharge unit are described. It is shown that such discharge systems are capable of forming broad lowenergy ion beams and can be used successfully in various fields of thinfilm technology.     

Peculiarities of the Azimuthal Transport of High-Current Electron Beams in a Curvilinear Cavity with a Transverse Magnetic Field

Technical Physics Letters - Peculiarities of the azimuthal transport of high-current electron beams in a curvilinear cavity with a transverse magnetic field have been studied by means of PIC...     

Peculiarities of the Interaction of Calcium Hydroxyapatite and Carbon Nanotubes Deposited from Aqueous Solutions

Technical Physics Letters - The codeposition of calcium salts, phosphorus, and multiwall carbon nanotubes (CNTs) from aqueous solutions in the Ca(OH)2–H3PO4–H2O–CNT system was...     

碳纳米管增强铝基复合材料的制备及其力学性能表征

利用高速剪切和球磨相结合的工艺,用石蜡辅助分散,制备得到碳纳米管(CNT)/铝复合粉体,随后采用常压烧结与大气热压相结合的工艺成型,最后经过热挤二次加工制备得到CNT增强铝基复合材料.结果表明,采用石蜡辅助的球磨混合分散工艺能显著改善CNT在基体中分布的均匀性,常压烧结后大气热压能显著提高材料致密度,达到类似热压烧结的效果,使材料力学性能显著提高;随着CNT含量的增加,复合材料的拉伸强度和布氏硬度逐渐升高,当CNT质量分数增加到2.0％时达到最大值,分别为245MPa和106.66N/mm2.     

膨胀石墨/石蜡复合材料的制备及热管理性能

石蜡作为相变材料(PCM),膨胀石墨(EG)为导热增强剂,制备不同EG含量的膨胀石墨/石蜡(EG/PCM)复合材料。采用瞬态热线法测量样品的导热系数;把EG/PCM应用于锂离子电池热管理,研究不同EG含量的EG/PCM热管理性能;采用ANSYS软件分析EG/PCM的导热系数对锂离子电池热管理的影响。结果表明:EG的加入大幅度提高了PCM的导热系数,EG含量≥9%时,EG/PCM的导热系数呈各向异性;锂离子电池表面温度随EG含量增加而减小,EG(12)/PCM(88)表现出优异的热管理性能;适当地提高EG/PCM的径向导热系数,有利于提高它的热管理性能。     

Autowave Pulse in a Medium with the Heating/Cooling Misbalance and an Arbitrary Thermal Dispersion

Technical Physics Letters - An analytical method for determining the amplitude and velocity of an autowave pulse emerging in isentropically unstable heat-releasing media is presented. The method is...     

铝合金隔热型材隔热性能检测方法及测量不确定度评定

传热系数测试是评价铝合金隔热型材隔热性能指标的重要途径,建立了铝合金隔热型材检测方法,分析了影响铝合金隔热型材传热系数测量的不确定度来源,对隔热型材传热系数测量不确定度进行评定分析,结果表明在（2．90—0．06）至（2．90＋0．06）W·m-2·K-1的区间包含了传热系数K测量结果可能值的95％,并提出了测量传热系数的注意事项。     

氮掺杂碳纳米管/铝基复合材料的制备及性能EI北大核心CSCD

采用化学气相沉积法合成出氮原子掺杂的碳纳米管,再将其与铝基体进行复合制备出碳纳米管/铝基复合材料。运用TEM和XPS研究氮掺杂碳纳米管的结构形貌和掺杂形态,并对碳纳米管/铝基复合材料的力学和电学性能进行研究与分析。结果表明:碳纳米管呈现出竹节状周期性多层结构,且成功掺杂氮原子。与纯碳纳米管相比,基于氮掺杂碳纳米管的铝基复合材料具有更高的抗拉强度和电导率。由于氮原子的引入,改善了碳纳米管的分散度和浸润性,提升了其电子传递效率,从而更有利于其在金属基复合材料中的应用。     

Study of the Viscosity Coefficient and Thermal Conductivity of Suspensions with Single-Walled Carbon Nanotubes

Technical Physics Letters - The viscosity coefficient and thermal conductivity of suspensions with single-wall carbon nanotubes have been experimentally studied. The nanotube mass concentrations...     

Effect of Graphene Oxide and Carbon Nanotubes on the Reaction of Tritium Atoms with Dalargin

Radiochemistry - Effect of carbon substrates materials (graphene oxide, reduced graphene oxide, single-walled carbon nanotubes) on the result of tritium introduction into dalargin peptide was...     

(YCa)F3助烧AlN陶瓷的显微结构和热导率

采用（ＣａＹ）Ｆ_３为助烧结剂,低温烧结（１６５０℃, ６ｈ）制备出热导率为２０８Ｗ／ｍ·Ｋ的ＡＩＮ陶瓷,在烧结过程中,热导率随保温时间的变化服从方程：λ（ｔ）＝λ∞－△λ（０）·ｅ~（－ｔ／ｒ）·用ＳＥＭ、 ＳＴｈＭ、 ＴＥＭ和 ＨＲＥＭ对 ＡＩＮ陶瓷的显微结构及其对热导率的影响进行了研究,结果表明,晶粒尺寸对ＡＩＮ陶瓷热导率的影响可以忽略,而分隔在ＡＩＮ晶粒之间的晶界相会降低热导率。     

Thermopower of Carbon Nanotubes in a Magnetic Field

Abstract

The thermopower of a quantum nanotube in magnetic field was investigated. We obtained the convenient analytic formula for the thermopower. The temperature dependence of the thermopower is studied and the influence of the magnetic field on the thermopower is examined. Oscillations in the thermopower were investigated.