苯甲醇在二氧化钛超微粒表面的光诱导电子转移和光反应过程研究

本文用自旋捕捆—ESR方法探讨了苯甲醇在超细微粒二氧化钛胶体表面的光诱导电子转移和光化学行为。结果明确地显示出,在不同pH条件下,笨甲醇在二氧化钛胶体表面的光化学行为有显著差别。在很低pH条件下,体系中检出明显的单重态氧加合物的信号,在pH=3.0左右,则以超氧负离子基为主;pH在4—6范围内时,产生较大量的苄氧基,且认pH=6时为最多;在pH为7左右时,除苄氧基外,同时还有一定量的羟甲基(·CH₂OH)和苯基自由基产生。本文对于不同pH条件下的光诱导电子转移和光化学反应机理进行了讨论。     

丁烯异构化L-H机理复杂反应动力学

用玻璃外循环无梯度反应器研究了丁烯异构化L-H机理复杂反应动力学. 用正交设计法估计了动力学方程中的参数. 色谱法测定了丁烯吸附热, 并研究了异构化生成反-2-丁烯及顺-2-丁烯的动力学方程.     

高温超导体混合态磁通涡旋结构

利用紧束缚模型,对s-d混合波的存在性作了讨论.在Ginzburg-Landan理论框架下,严格求解了高温超导体混合配对态磁通涡旋结构.结果表明,其磁通涡旋的分布与单个涡旋的结构密切相关.在低温下,由于序参量s波成分的存在及它与d波分量的耦合,引起局域磁场和d波分量的各向异性,使磁通涡旋呈斜格子分布,而在温度近于转变温度时,各向异性消失,涡旋态转化为三角格子.这与YBa₂Cu₃O₇样品的小角度中子散射实验的结果相符合. 关键词：     

A Method for Avoiding the Divergence Difficulties of Quant urn Mechanics

Abstract High-ordered correction of wavefunction for Schrodinger equation with one dimensional potential V(x) and interaction Hamiltonian H′(x) has been found by introducing a new particular solution φ_Ek⁽⁰⁾ for H′(z) = 0. Convergence conditions of the rvavefunction lead to the formulas of energy corrections and scattering amplitudes. It is shown that the result can avoid some divergence difficulties of quantum mechanics.     

面向应用型人才培养的仪器分析实验教学改革

为实现应用型人才培养目标,在“仪器分析实验”课程教学体系中增加了设计性实验项目,以促进对学生的创新和实践能力的培养。具有针对性的合理选题,注重理论联系实际;倡导启发式教学,结合多媒体教学丰富课堂;建立科学全面的考核评价体系,培养学生创新意识和实践能力。实践教学改革凸显了设计性实验在仪器分析教学当中的重要作用,同时也凸显出此课程教学计划的科学性、教学内容的先进性以及教学手段的连贯性。     

基于磷酸化修饰的核/壳硅纳米颗粒药物缓释体研究

采用反相微乳液体系中功能化基团同步修饰方法制备了包载抗肿瘤药物平阳霉素(PYM)的磷酸化核/壳硅纳米颗粒(PYM-PO4SiNP), 考察了不同量的磷酸化修饰试剂对PYM-PO4SiNP的影响. 结果表明, 随着磷酸化修饰试剂量的增加, 制备的PYM-PO4SiNP的电位逐渐降低, 其包载的PYM 的释放速率逐渐加快, 但对颗粒的粒径没有明显影响. 本文选择能使药物平稳、缓慢释放的磷酸化修饰试剂用量, 制备了稳定性好、药物缓释时间长的PYM-PO4SiNP, 其载药量和包封率分别为7.2%和37.81%, 通过与CNE-2细胞共培育后, 可以使CNE-2细胞的存活率逐渐下降, 而磷酸化核/壳硅纳米颗粒PO4SiNP载体本身是没有毒性的. 这一研究工作的开展拓宽了核/壳硅纳米颗粒在药物载体领域中的应用.     

Possible Spectrums of 3×3 Upper Triangular Operator Matrices

Let H1, H2 and H3 be infinite dimensional separable complex Hilbert spaces. We denote by M(D,E,F) a 3×3 upper triangular operator matrix acting on H1⊕H2⊕H3 of the form M(D,E,F)=(A D E 0 B F 0 0 C). For given A ∈ B(H1), B ∈ B(H2) and C ∈ B(H3), the sets UD,E,F σp(M(D,E,F)), ∪D,E,F σr(M(D,E,F)), ∪D,E,F σc(M(D,E,F)) and ∪D,E,F σ(M(D,E,F)) are characterized, where D ∈ B(H2,H1), E ∈ B(H3, H1), F ∈ B(H3, H2) and σ(·), σp(·), σr(·),σc(·) denote the spectrum, the point spectrum, the residual spectrum and the continuous spectrum, respectively.     

Enrichment of Fetal Nucleated Red Blood Cells by Multi-core Magnetic Composite Particles for Non-invasive Prenatal Diagnosis

A novel kind of multi-core magnetic composite particles, the surfaces of which were respectively modified with goat-anti-mouse IgG and antitransferrin receptor(anti-CD71), was prepared. The fetal nucleated red blood cells(FNRBCs) in the peripheral blood of a gravida were rapidly and effectively enriched and separated by the modified multi-core magnetic composite particles in an external magnetic field. The obtained FNRBCs were used for the identification of the fetal sex by means of fluorescence in situ hybridization(FISH) technique. The results demonstrate that the multi-core magnetic composite particles meet the requirements for the enrichment and speration of FNRBCs with a low concentration and the accuracy of detetion for the diagnosis of fetal sex reached to 95%. Moreover, the obtained FNRBCs were applied to the non-invasive diagnosis of Down syndrome and chromosome 3p21 was detected. The above facts indicate that the novel multi-core magnetic composite particles-based method is simple, reliable and cost-effective and has opened up vast vistas for the potential application in clinic non-invasive prenatal diagnosis.     

含裂纹结构可靠度的多尺度求解

针对环境作用下金属结构从微观损伤到宏观失效的复杂过程,选用具有局部细化特征的CAS小波,先对疲劳裂纹扩展方程进行离散处理,将微分方程转化为代数方程组,然后用完全积分可靠性分析模型,对一般环境中和引入环境系数的含裂纹结构的可靠度进行求解.最后,验证了利用CAS小波多尺度方法求解复杂环境中结构疲劳破坏过程是可行的,并能很好地解决短裂纹与长裂纹扩展的光滑过渡.     

不同配副下ZrB2-SiC复相陶瓷的摩擦学性能

以微米级ZrB_2和SiC粉末为原料,采用热压烧结制备ZrB_2-SiC复相陶瓷,考察了SiC含量,摩擦对偶,速度和载荷对ZrB_2-SiC复相陶瓷摩擦磨损特性的影响.结果表明:ZrB_2-SiC复相陶瓷的摩擦系数和磨损率对SiC含量和摩擦对偶的变化较为敏感,速度和载荷变化,摩擦系数和磨损率的波动较大;以WC为对偶,速度0.1 m/s,载荷5 N时的ZrB_2-SiC复相陶瓷的平均摩擦系数和磨损率分别仅为0.4和2.41×10–4 mm3/(N·m).ZrB_2-SiC复相陶瓷的磨损机制以机械磨损为主,伴有轻微摩擦氧化,摩擦层的形成有利于摩擦系数的减小.