乙烯基吡咯烷酮—醛酸乙烯酯共聚物对1—苯胺基萘—8—磺酸盐水溶液的荧光...

将荧光探针１－苯胺基萘－８－磺酸盐（ＡＮＳ）加入到乙烯基吡咯烷酮（ＶＰ）－醋酸乙烯酯（ＶＡＣ）共聚物溶液中，共聚物组成分别为ＦＶＰ＝０．８４；０．７４；０．７０；０．５５（以乙烯基吡咯烷酮结构单元的分子数表示）。实验结果表明：ＶＰ－ＶＡＣ共聚物对ＡＮＳ水溶液的荧光强度增强效应与共聚物中乙烯基吡咯烷酮在逻节中的比例有关，其组成为ＦＶＰ＝０．５５的共聚物对ＡＮＳ水溶液有显著的荧光增强效应，相对荧光强度     

乙烯基吡咯烷酮－醋酸乙烯酯共聚物对1－苯胺基萘－8－磺酸盐水溶液的荧光特性的影响

将荧光探针１－苯胺基萘－８－磺酸盐（ＡＮＳ）加入到乙烯基吡咯烷酮（ＶＰ）－醋酸乙烯酯（ＶＡＣ）共聚物溶液中，共聚物组成分别为ＦＶＰ＝０．８４；０．７４；０．７０；０．５５（以乙烯基吡咯烷酮结构单元的分子数表示）。实验结果表明：ＶＰ－ＶＡＣ共聚物对ＡＮＳ水溶液的荧光强度增强效应与共聚物中乙烯基毗咯烷酮在链节中的比例有关，其组成为ＦＶＰ＝０．５５的共聚物对ＡＮＳ水溶液有显著的荧光增强效应，相对荧光强度比ＰＶＰ均聚物大一倍，而其他组成的共聚物／ＡＮＳ溶液的相对荧光强度只与溶液中ＶＰ结构单元的含量有关。这种现象说明接近等分子比的乙烯基吡咯烷酮－醋酸乙烯酯共聚物与ＡＮＳ分子间形成的过渡态结构有利于能量转移，能产生较高的量子收率，可作为电子转移反应能量转移介质。在生化反应中，可模拟酶反应机理，因而有一定的理论意义和实际意义。     

铕与对甲基苯甲酸及2，2＇－联吡啶三元配合物的谱学研究

元素分析表明稀土铕（Ｅｕ~（３＋））与对甲基苯甲酸（Ｐ－ＭＢＡ）及２．２＇－联吡啶（ｄｉｐｙ）形成的三元配合物的组成为Ｅｕ_２（Ｐ－ＭＢＡ）_６（ｄｉｐｙ）_２，对甲基苯甲酸、２，２＇－联吡啶均以双齿配位，中心铕离子的配位数为８，两个铕离子通过四个对甲基苯甲酸基桥联，形成双核配合物，对该配合物的结构作了核磁共振氢谱、碳谱及红外光谱的研究。     

二苯甲酰甲烷2，2′—联吡啶混合稀土配合物中钆、钇对铕发光的影响

在乙醇溶液中合成了以二苯甲酰基甲烷（DBM）和2，2′联吡啶（Dipy)为配体，三价铕、等摩尔三价铕－钆及等摩尔三价铕－钇混合稀土为中心体的配合物。测定了配合物的组成，研究了其红外光谱和荧光光谱。结果表明：配合物的最佳激发波长为425nm；在425nm波长光激发下，配合物发出较强的荧光；不发光的Gd^3 和Y^3 离子对Eu^3 离子的发光有一定增强作用，其中钇使铕的荧光发射增强大于钆；这两个不发光稀土离子对铕的发射峰位影响不大。     

铕与对甲基苯甲酸及2,2‘—联吡啶三元配合物的谱学研究

元素分析表明稀土铕（Ｅｕ＾３＋）与对甲基苯甲酸（Ｐ－ＭＢＡ）及２，２’－联吡啶（ｄｉｐｙ）形成的三元配合物组成为Ｅｕ２（Ｐ－ＭＢＡ）６（ｄｉｐｙ）２对甲基苯甲酸，２，２’－联吡啶均以双齿配位，中心铕离子的配位数为８，两个铕离子通过四个对甲基苯甲酸基桥联，形成双核配合物，对该配合物的结构作了核磁共振氢谱，碳谱及红外光谱的研究。     

减压氩气环境下激光显微光谱分析再现性和灵敏度的研究

以金属合金光谱分析标样为样品，采用激光显微发射光谱分析系统在减压氩气环境下，实验研究了光谱分析再现性和灵敏度。以原子线作为分析线的RSD减压氩气环境好于常压空气环境，以离子线作为分析线的RSD基本相同，样品的组成和元素的浓度对分析线的RSD有较大的影响。测定的铝合金样品Cu,Zn,Mg浓度曲线斜率是空气环境下的1．5－2倍，表明分析灵敏度得到明显改善，有利于激光显微光谱分析范围的扩展。     

近垂直传播电子回旋寻常波的传播和吸收特性的解析研究

对近垂直入射的电子回旋寻常波的传播和吸收，用相对论等离子体色散关系进行了分区分析，获得了共振层附近内区O－模与X－模的耦合的准确表达式，该结果与非相对论近似下的结论有重大差别，获得了波衰减因子的解析表达式，波的衰减因子由两部分组成：O－模的相对论衰减及与O－模耦的X－模的衰减。     

组成论介绍(上)：广义集合和分布函数

从天体到原子都存在内部组成问题，组成论为研究各种组成问题提供一般模型、概念、方法和规律，组成论把“分子由原子组成”的认识泛化为更一般的模型，并且称它为广义集合。每个广义集合都伴有一个分布函数，用分布函数可计算出度量系统状态丰富程序的一个物理量－－复杂程度，具有随机性的事物的复杂程序会自动地最大化（熵原理），利用这种最大化可以反求很多公式，组成论是从新视角分析事件的知识框架。     

噻吩甲酰基吡唑啉酮缩乙二胺铀(Ⅵ)钍(Ⅳ)配合物的合成及光谱表征

合成了两种新双席夫碱配合物[UO2(PMTHP)2en]和[Th(PMTHP)2en(NO3)2]，其中（PMTHP）2en为N，N′-双[(1-苯基－3－甲基－5－氧－4－吡唑啉基）2－噻吩次甲基]乙二亚胺。通过元素分析，红外光谱，电子光谱，核磁共振谱，摩尔电导等测试，对新配合物的组成、结构和性质进行了表征。     

Ni（II）与壳聚糖的配位作用及其催化性质的研究

用ＥＳＲ、ＸＰＳ、ＩＲ、ＵＶ－Ｖｉｓ、ＤＴＡ－ＴＧ和电导率法研究Ｎｉ（Ⅱ）与壳聚糖（ＣＳ）的配位作用、所形成的配位聚合物（配聚物）的组成和结构。确定Ｎｉ（Ⅱ）与ＣＳ分子以配位键相结合形成高自旋Ｎｉ－ＣＳ配聚物，配聚物的配位单元由１个Ｎｉ（Ⅱ）与３个ＣＳ单体单元的氨基Ｎ原子和仲羟基Ｏ原子形成扭曲的六配位的八面体结构所组成。此外，对Ｎｉ－ＣＳ配聚物与Ｎａ２ＳＯ３体系在ＭＭＡ聚合中的催化性质进行了研究。     

直接沉淀法中不同晶型钛酸锌的X射线粉末衍射研究

以Ti(SO₄)₂和Zn(NO₃)₂·6H₂O为原料,碳酸铵为沉淀剂,采用直接沉淀法制备了钛酸锌的粉体。探讨了反应条件对所得钛酸锌晶体结构的影响,并对样品进行了XRD和TG-DTA等分析。钛酸与碳酸锌分子生成的先后顺序影响得到的钛酸锌的结构。在钛酸优先生成的体系中,碳酸锌分子生成之后与周围足量的钛酸分子发生碰撞反应,由于钛酸优先生成且沉淀剂足量,碰撞反应充分且在碰撞反应中钛酸保持过量,反应生成了亚钛酸锌(Zn₂Ti₃O₈)。在碳酸锌优先生成的体系中,钛酸分子生成之后与周围足量的碳酸锌分子发生碰撞反应,由于碳酸锌优先生成且沉淀剂足量,碰撞反应充分且在碰撞反应中碳酸锌保持过量,反应生成了正钛酸锌(Zn₂TiO₄)。另外,沉淀剂用量和反应温度都影响着最终产物的种类和晶型。沉淀剂用量越多、反应温度越高,越易于生成Zn₂Ti3O₈或Zn₂TiO₄。只有在沉淀剂不足、反应温度较低的情况下,才能生成偏钛酸锌(ZnTiO₃)。     

Energy levels of Kr populated by Br decay

The γ-rays following the β-decay of ⁸²Br have been investigated using a 220 mm³ Ge(Li) detector, an anti-Compton NaI(Tl) spectrometer and a two-dimensional coincidence arrangement. The ⁸²Br was produced by thermal neutron activation of ammonium bromide. The presence of eight, well-known and 11 weak γ-rays has been established. It has been shown through half-life measurements that the newly identified γ-rays belong to ⁸²Br decay and that the high-energy peaks are not to summing effects. All the reported transitions have been incorporated in a level scheme of ⁸²Kr by introducing levels at 0, 776, 1474, 1820, 1953, 2093, 2426, 2554, 2647 and 2828 keV. Limits on probable spin and parity values for the newly-introduced levels have been established. The level introduced at 2828 keV on the basis of a 1008–1043 keV γγ-coincidence must be fed by a weak β-branch of ⁸²Br with an end-point energy of 263 keV and log ft of approximately 6.1.     

Natural Bond Orbital(NBO),Natural Population Analysis and Mulliken Analysis of Atomic Charges of 4-Amino-3-Phenylbutanoic Acid

The Molecular Structure of 4-Amino-3-phenylbutanoic acid conformers have been studied in the gas phase. Natural Bond Orbital Analysis (NBO) and Mulliken analysis of atomic charges of 4-Amino-3-phenylbutanoic acid have been performed by DFT level of theory using B3LYP/6-311++G(d,p) basis set. The atomic charges, electronic exchange interaction and charge delocalization of the molecule have been performed by Natural Bond Orbital(NBO) analysis and Natural Population Analysis(NPA) have been constructed at B3LYP/6-311++G(d,p) level.     

EPR study of radiation damage in gamma-irradiated 3-nitroacetophenone single crystal

This paper presents the results of the electron paramagnetic resonance (EPR) study of the anion radical formed from 3-nitroacetophenone (C₈H₇NO₃) (3NAP) single crystal, by gamma irradiation. The EPR spectra of gamma-irradiated single crystals of 3NAP have been recorded at 10-degree intervals for different orientations of crystals in a magnetic field, at room temperature. The EPR analysis of gamma-irradiated crystals of 3NAP has shown that the radiation damage center produced by gamma irradiation is the carbon-centered 3NAP anion radical. One-electron reduction of 3NAP results in general bond loosening. The single crystals have been investigated between 120 and 450?K. The spectra have been found to be temperature-dependent. The EPR parameters of the 3NAP anion radical have been evaluated.     

Fully three-dimensional accurate modeling of scattering loss in optical waveguides

Scattering loss in high-index-contrast optical waveguides has been modeled by a rigorous 3D numerical algorithm based on volume current method. The electromagnetic field generated by the wire current distribution simulating sidewalls roughness has been calculated by 3D finite element method. The developed modeling technique does not introduce any approximation in radiated power estimation. Numerical results obtained by our model have been compared with some experimental results reported in literature for four typical sub-micrometer high-index-contrast waveguides realized by different technologies and a very good agreement (relative error less than 3%) has been demonstrated. Closed-form expressions for scattering loss in low-index-contrast waveguides have been also derived and discussed. Developed modeling technique has been compared with other three-dimensional algorithms for scattering loss estimation and its advantages in terms of accuracy, computation time and generality have been pointed out. Scattering loss dependence on the parameters of the roughness distribution has been finally discussed.     

Cu(111)三维表面岛对表面原子扩散影响的分子动力学研究

采用嵌入原子方法的原子间相互作用势，利用分子动力学方法计算了同质外延生长中不同层数的三维Cu(111)表面岛上表面原子扩散激活能，分析了三维表面岛的层数对表面原子交换扩散和跳跃扩散势垒的影响. 研究结果表明，二维Enrilich-Schwoebel(ES)势垒小于三维ES势垒，且三维ES势垒不随表面岛层数的增加而显著变化. 对于侧向表面为(100)的表面岛，表面原子沿〈011〉方向上的扩散行为，随表面岛层数增加而逐渐变化；在表面岛层数达到3层时，扩散路径上的势垒变化趋于稳定，表面原子扩散以下坡扩散为主. 对于侧面取向为(111)的表面岛，当表面岛层数大于3层后，开始呈现上坡扩散的可能. 关键词： 表面原子 扩散 分子动力学模拟     

Low-intensity transitions in the decay of Rb

The γ-rays following the decay of ⁸⁸Rb have been studied with a 40 cm³ Ge(Li) detector with the aim of resolving discrepancies in some recent determinations of the decay scheme of this isotope. The existence of a 1799 keV γ-ray has been confirmed and three new γ-rays with energies of 1218, 1295 and 1368 keV have been found. All of these results are in good agreement with a decay scheme recently proposed by Ragaini and Knight.     

热蒸发YbF3薄膜的机械特性

 实验研究了热蒸发YbF₃薄膜在大气中的应力和附着力。利用Veeco干涉仪,测试了各种工艺条件下单层YbF₃薄膜的应力。结果发现:YbF₃薄膜的残余应力为张应力,热应力在残余应力中的比重较大;沉积方式对薄膜应力的影响不大;薄膜应力在大气中有一个释放的过程。热处理后,YbF₃薄膜应力增大。     

Optical investigation of the emission lines for Eu and Tb ions in the GaN powder host

Gallium nitride (GaN) doped by Eu³⁺ and Tb³⁺ ions have been synthesized using powder technology. The emission and absorption spectra have been obtained by using photoluminesence technique and correlated with the local structural environments. The room temperature yellow emission from GaN grains as well as from Eu³⁺ and Tb³⁺ ions has been observed for nano- as well as for microGaN grains. Additionally, for GaN:1%Eu³ micrograins the blue emission from GaN nanocrystals has been observed.     

Nd：Mg：LiNbO3单晶光学特性的初步研究

本文对Nd:Mg:LiNbO_3单晶的透射光谱、光学均匀性、抗光折变特性、倍频与自倍频特性进行了初步研究.报道了染料激光泵浦的Nd:Mg:LiNbO_3自信频激光实验,实现了非临界位相匹配下的自倍频运转,获得了波长为542.2nm的二次谐波输出.