Volume Effect of Bound States in Quark-Gluon Plasma

Bound states, such as qq and q^-q, may exist the volume of the bound states may evoke a reduction in investigate qualitatively the volume effect on the properties states start to be completely melted.     

Strain distributions and electronic structure of three-dimensional InAs/GaAs quantum rings

This paper presents a finite element calculation for the electronic structure and strain distribution of self-organized InAs/GaAs quantum rings. The strain distribution calculations are based on the continuum elastic theory. An ideal three-dimensional circular quantum ring model is adopted in this work. The electron and heavy-hole energy levels of the InAs/GaAs quantum rings are calculated by solving the three-dimensional effective mass Schr?dinger equation including the deformation potential and piezoelectric potential up to the second order induced by the strain. The calculated results show the importance of strain and piezoelectric effects, and these effects should be taken into consideration in analysis of the optoelectronic characteristics of strain quantum rings.     

柠檬酸钠对氢氧化镁铝微粒乳化作用的影响

氢氧化镁铝;微粒乳化作用;液体石蜡;柠檬酸钠     

新单取代苯磺酰脲衍生物的合成及生物活性

以较高活性的单取代苯磺酰脲为基础,设计合成了14个新的含烷硫基和烷胺基嘧啶环的单取代苯磺酰脲化合物,其结构经¹HNMR及元素分析确证.用油菜根长法测定IC₅₀,并进行盆栽除草活性测试,结果表明,嘧啶环4位取代基的变化对分子除草活性影响较大,活性大致按烷氧基、烷硫基和烷胺基的顺序递减.     

粉末化学镀法制备NiB/NaBETA催化剂及其加氢催化性能

粉末化学镀法制备NiB/NaBETA催化剂及其加氢催化性能;非晶态合金催化剂     

水热法制备掺杂铁离子的TiO2纳米粒子及其光催化反应研究

以TiCl⁴为前驱体,采用水热法制备了掺杂铁离子的TiO₂纳米粒子,利用XRD对不同条件下制备的产物进行了表征,探讨了反应温度、胶体溶液pH值和反应时间对水热反应的影响.考察了所制备的Fe³⁺-TiO₂纳米粒子光催化降解罗丹明B的催化性能,实验发现,制备的掺杂0.1%Fe³⁺-TiO₂纳米粒子与纯TiO₂相比,具有更好的催化活性.     

Relativistic Spin Operators

A systematic theory on the appropriate spin operators for the relativistic states is developed.For a massive relativistic particle with arbitrary nonzero spin,the spin operator should be replaced with the relativistic one,which is called in this paper as moving spin.Further the concept of moving spin is discussed in the quantum field theory.A new operator,field quanta spin is defined and in terms of the generators of Poincare group the moving spin of field system is constructed.It is shown that,in virtue of the two operators,problems in quantum field concerned spin can be neatly settled.     

A series of multidimensional MOFs incorporating a new N-heterocyclic building block: 5,5′-Di(pyridin-3-yl)-3,3′-bi(1,2,4-triazole)

Using the N-heterocyclic building block 5,5′-di(pyridin-3-yl)-3,3′-bi(1,2,4-triazole) (3,3′-H₂dbpt), four 3-D coordination polymers with diverse connectivity, [M(3,3′-dbpt)]_n, M=Co (1), M=Ni (2), M=Zn (3), and [Cd₂(3,3′-dbpt)Cl₂]_n (4), were constructed. By changing the central metal ions, 3,3′-H₂dbpt had three different coordination modes. Consequently, 1–3, which are isostructural, have a 3-D 4-connected topology with (4².8⁴) Schläfli symbol. 4 has a 3-D (4, 6)-topology, with (4³.6³)₂(4⁶.6⁶.8³) Schläfli symbol. Both 1 and 2 reveal weak antiferromagnetic behavior. In addition, 3 and 4 exhibit purple and blue emission bands, respectively. These results indicate that 3,3′-H₂dbpt is an excellent multi-connection linker to construct MOFs with interesting structures and properties.     

由三羧基配体桥联的含有线性四核钴簇单元的二维层状配位聚合物的组装和性质

以金属钴盐、2-羟基-1,3,5-苯基三羧酸(OH-H_3BTC)为原料,在碱性条件下,通过水热方法合成了一个钴配位聚合物[Co_2(O-BTC)(H_2O)_5]_n(1),并利用X射线粉末和单晶衍射、红外光谱、元素分析以及热重等方法对该化合物进行了表征。化合物1含有线性四核单元[Co_4O_7],四核单元内的金属离子是通过羧酸氧原子和羟基氧原子桥联的。该四核单元进一步通过O-BTC~(4-)配体在ab平面上形成一个二维层状结构,相邻的层与层通过氢键作用形成一个三维超分子结构。热重分析结果显示化合物1在100℃开始失重。磁性研究表明,化合物1中相邻的钴离子之间存在反铁磁性相互作用。