搜索结果: 16-30 共查到“知识库 金属物理学”相关记录129条 . 查询时间(2.979 秒)
以淮南市叶面尘及对应地表灰尘为研究对象，采集了6个不同功能区的石楠叶面尘和相应地表灰尘，研究了Cr、Cu、Zn、Pb、As、Ni、V的分布特征及其来源，并采用美国EPA人体暴露风险评价模型，对不同功能区、不同暴露途径的儿童重金属致癌和非致癌健康风险进行评估.结果表明：淮南市叶面尘中重金属含量显著高于地表灰尘，叶面尘主要污染元素为Zn、Pb、Cu、As、Ni，地表灰尘中主要污染元素为Cu、Zn、Pb...
以柠檬酸镍（CA-Ni）、酒石酸镍（TA-Ni）、焦磷酸镍（SP-Ni）3种低浓度模拟络合镍废水为研究对象，选用自制的重金属捕集剂N，N-双（二硫代羧基）乙二胺（EDTC），对废水中的Ni进行深度脱除.重点研究了EDTC投加量、初始pH、反应时间对Ni去除效果的影响及螯合沉淀物的沉淀性能和溶出特性，同时分析了EDTC去除络合Ni的机理.研究结果表明，处理初始浓度5 mg·L-1的CA-Ni、TA-...
利用甲苯二异氰酸酯(TDI)作桥连分子制备氨基官能化介孔SBA-15分子筛. 首先, SBA-15表面的Si-OH与TDI分子中的一个-NCO基反应, 然后, TDI分子中另一端未参与反应的-NCO基与乙二胺分子中的一个-NH2基反应, 通过上述两步反应, -NH2被成功嫁接到介孔SBA-15分子筛表面. X射线粉末衍射仪(XRD)、N2 吸脱附、傅里叶变换红外光谱(FT-IR)和29Si MAS...
石墨烯作为一种新型的二维碳材料, 在高性能纳米电子器件、复合材料、场发射材料、气体传感器及能量存储等领域具有非常重要的应用前景. 然而, 大规模可控合成高质量的石墨烯仍然面临巨大的挑战, 其中比较有效的方法之一是在金属衬底上生长石墨烯. 本文总结了近年来在金属衬底上生长石墨烯的机理研究方面取得的重要进展, 从初始阶段、成核阶段、长大过程3 个方面进行了介绍, 最后还介绍了氢气在石墨烯生长过程中所起...
基于亚毫米尺度金属包覆波导的茅台酒折射率测量
对称金属包覆波导 茅台酒 折射率
2012/11/23
利用亚毫米尺度双面金属对称包覆波导测量茅台酒的折射率，测量方法只需待测茅台酒对激光透明，则折射率大小不受限制，此方法简单有效，精度可达1.0 ×10-4，从而可以用来鉴定茅台酒的真伪.
The strong correlation effects on topological insulator are studied in a two-sublattice system with an onsite single-particle energy difference between two sublattices. At = 0, increasing the onsi...
Conductance fluctuations in metallic nanogaps made by electromigration
Conductance fluctuations metallic nanogaps
2010/11/25
We report on low temperature conductance measurements of gold nanogaps fabricated by ontrolled electro-migration. Fluctuations of the conductance due to quantum interferences and depending both on bia...
First principles investigation of Bi$_6$Ti$_4$O$_{17}$: oxide ferroelectricity with a low band gap
First principles investigation low band gap
2010/11/25
We report first principles studies of the hypothetical compound Bi6Ti4O17, which is an alternate stacking of the ferroelectric Bi4Ti3O12. We find that this compound is ferroelectric, similar to Bi4Ti3...
Experimental and theoretical study of processes of formation and growth of pearlite colonies in eutectoid steels
Experimental theoretical study of processes of formation pearlite colonies
2010/11/25
We describe our optical and electron-microscopy observations of pearlite structures in eutectoid steels which seem to imply that the mechanisms of formation of pearlite colonies in these steels differ...
Zero-Temperature Structures of Atomic Metallic Hydrogen
Zero-Temperature Structures Atomic Metallic Hydrogen
2010/11/25
Ab initio random structure searching with density functional theory was used to determine the
zero-temperature structures of atomic metallic hydrogen from 500 GPa to 5 TPa. Including zero
point moti...
Optical detection of spin transport in non-magnetic metals
Optical detection of spin transport non-magnetic metals
2010/11/24
We determine the dynamic magnetization induced in non-magnetic metal wedges composed of
silver, copper and platinum by means of Brillouin light scattering (BLS) microscopy. The magnetization is trans...
Graphene, a hexagonal sheet of sp2-bonded carbon atoms, has extraordinary properties which hold immense promise for future nanoelectronic applications. Unfor-tunately, the popular preparation methods ...
Effects of s,p - d and s - p exchange interactions probed by exciton magnetospectroscopy in (Ga,Mn)N
exchange interactions exciton magnetospectroscopy
2010/11/25
Near band-gap photoluminescence and reflectivity in magnetic field are employed to determine the exchange-induced splitting of free exciton states in paramagnetic wurtzite Ga1−xMnxN, x . 1%,grow...
Dysprosium-based experimental representatives of an Ising-Heisenberg chain and a decorated Ising ring
Dysprosium-based experimental representatives decorated Ising ring
2010/11/24
It is shown that the bond-decorated Ising model is a realistic model for certain real magnetic
compounds containing lanthanide ions. The lanthanide ion plays the role of Ising spin. The re-
quired c...
Metallic nanograins: spatially nonuniform pairing induced by quantum confinement
Metallic nanograins: spatially nonuniform quantum confinement
2010/11/24
It is well-known that the formation of discrete electron levels strongly influences the pairing in metallic nanograins. Here we focus on another effect of quantum confinement in superconducting grains...