渗透构造思想培养创新意识

根据条件和结论的结构特征 ,利用各知识间的内在联系 ,有目的地构造一特定的数学模型 ,从而使问题得以解决的思想 ,即构造思想 .运用构造思想解题常可以独辟蹊径 ,出奇制胜 ,对学生创新意识的培养大有裨益 .1　构造函数证明不等式可以说 ,有数学的地方往往也就有函数 ,因此 ,可以用一次函数的线性性质、二次函数的最值 ,以及函数的单调性等性质 ,对不等式进行证明 .例 1　若 | a| <1 ,| b| <1 ,| c| <1 ,a,b,c为实数 ,求证 :ab bc ca >- 1 .分析　构造一次函数f( x) =( b c) x bc 1 ,则有　 f ( 1 ) =( b c) bc 1=( 1 b) ( …     

Properties of the ground state in a spin—2 transverse Ising model with the presence of a srystal field

The properties of the ground state in the spin-2 transverse Ising model with the presence of a crystal of a crystal field are studied by using the effective-field theory with correlations,The longitudinal and transverse magnetizations,the phase diagram and the internal energy in the ground state are given numerically for a honeycomb lattice(z=3).     

铁磁─反铁磁双层系统低温特性(英文)

采用自旋波的理论研究反铁磁层间耦合强度和不同自旋值对铁磁—反铁磁双层系统磁性质的影响，在层间反铁磁耦合情况下．得出了不同自旋值时每层子晶格交叉点的温度，在低温下表现出量子效应。     

Simulation study of co-assembly of ABC triblock copolymer/nanoparticle into multicompartment hybrids in selective solvent

Co-assembly of ABC linear triblock copolymer/nanoparticle into bump-surface multicompartment hybrids in selective solvent was studied through self-consistent field theory (SCFT) simulation. Results from three-dimensional SCFT simulation showed that the hybrid morphology depended on the length and number of grafted chains, whereas the number and shape of bumps relied on nanoparticle size. Moreover, the simulation results showed that the length and number of grafted chains had equivalent effect on hybrid morphology. Calculated results indicated that entropy was a more important factor than enthalpy in the co-assembly.     

顶点算子超代数的双模

对于任意一个顶点算子超代数$V$及$m,n\in
\frac{1}{2}\mathbb{Z}_{+}$, 通过构造$A_n(V)-A_m(V)$-\!双模
$A_{n,m}(V)$, 刻画了$V$
的一个从可容许$V$-\!模的第$m+1$层子空间到第$n+1$层子空间的作用,
并得到一类Verma型可容许$V$-\!模.     

过度自信与风险溢价研究

非理性投资者的心理会影响风险溢价。本文基于投资者的过度自信心理偏差构建了证券投资的理性风险溢价度量模型、非理性风险溢价度量模型,并利用理性投资者和非理性投资者的相互作用,构建了证券投资的市场风险溢价度量模型,研究了非理性风险溢价对理性风险溢价和市场风险溢价的偏离问题。研究结论表明:非理性风险溢价偏离市场风险溢价的程度依赖于非理性投资者的市场价值权重。     

Quantum fluctuations of the antiferro-antiferromagnetic double-layer

This paper stuides the magnetization and quantum fluctuations of an antiferro-antiferromagnetic (AF-AF) double-layer at zero temperature. It is found that the exchanges and anisotropy constants affect the quantum fluctuations of spins. If the anisotropy exists, there will be no acoustic energy branch in the system. The anisotropy constant, antiferromagnetic intralayer and interlayer coupling have important roles in a balance of the quantum competition.     

可再生Fe3O4/CuFeS2/生物质复合降解柱对有机染料的处理性能

采用具有单分散性、 平均粒径分别为(200±0.5) nm和(6.5±0.5) nm的Fe₃O₄纳米微球和CuFeS₂纳米晶与生物质废弃物复合制备出Fe₃O₄/CuFeS₂/生物质复合降解柱. 该降解柱能高效处理有机染料亚甲基蓝(MB)和罗丹明B(RhB), 降解率超过90%. CuFeS₂中的Cu⁺能显著促进芬顿反应, 而Fe₃O₄较强的磁性有利于催化剂的回收. 更重要的是, 再生后的复合柱对有机染料的降解率没有明显降低, 仍可达90%以上. 此外, 该降解柱可充分利用生物质废弃物, 解决其回收利用的难题.     

The study of magnetization of the spin system in the ground state

Within the framework of the effective-field theory with self-spin correlations and the differential operator technique, the ground state magnetizations of the biaxial crystal field spin system on the honeycomb lattices have been studied. The influences of the biaxial crystal field on the magnetization in the ground state have been investigated in detail.     

趋磁细菌研究—— Ⅱ.趋磁细菌WD-1的生长和磁小体的合成条件

报道了趋磁细菌WD-1生长和磁小体合成的最适条件。在pH6.7、28℃和静止培养条件下,每100mL含50～100mg柠檬酸或100～150mgα-酮戊二酸和20mg硫酸铵分别是WD-1生长的最适碳、氮源,碳氮比以5:1或4:1为好。每100mL含50mg柠檬酸、75～125mgα-酮戊二酸、75mg酒石酸或175mg乙酸钠,10mg硝酸钠或10～20mg硫酸铵,15μmol·L~(-1)三氯化铁或硫酸亚铁分别是磁小体合成的最适碳、氮和铁源。而1～3％的氧浓度是必需的。