单纯形上加权K—泛函与光滑模的等价性及其应用

本文首先讨论了高维单纯形上一类加权Ｋ－泛函与光滑模的等价性。然后作为应用，给出了高维单纯形上多元Ｂｅｒｎｓｔｅｉｎ算子加权逼近的特征刻划。     

未熔透尺寸对十字焊接接头疲劳性能影响规律试验研究

针对某厂一压力机架的焊接结构，采用极大似然方法，进行了部分熔透焊接十字接头的拉—拉疲劳试验，得到了该类结构的Ｐ－Ｓ－Ｎ对数曲线。研究了未熔透尺寸对接头的应力集中系数、疲劳强度和试件疲劳破坏形式的影响规律，结果表明，在焊缝与母材等强的情况下，当未熔透尺寸２ａ／Ｔ＜０．５时，其疲劳性能无明显减弱；而当未熔透尺寸２ａ／Ｔ＞０．５时，则接头的抗疲劳性能有显著的改变。     

Synthesis and Characterization of a Homochrial Manganese（Ⅱ）Complex Constructed from （1R,2R）-（-）-Diaminocyclohexane-N,N biscarboxyl-salicylidene）

A homochrial manganese(Ⅱ) complex derived from chiral salen ligand (1R,2R)-(-)diaminocyclohexane-N,N-biscarboxyl-salicylidene) (1) has been synthesized through solvothermal procedure and characterized by IR,elemental analysis,TGA,circular dichroism (CD),powder and single-crystal X-ray crystallography.It crystallizes in monoclinic,space group C2 with a=32.987(7),b=7.4662(15),c=17.931(4),β=97.82(3)°,V=4375.0(15) 3,Z=8,D c=1.544 g/cm 3,F(000)=2096,M r=508.36,μ=0.658 mm-1,the final GOOF=0.975,R=0.0676 and wR=0.2068 for 6357 observed reflections with I > 2σ(Ⅰ).The coordination polymer 1 possesses a 1D infinite zigzag chain architecture constructed by the dicarboxyl-functionalized metallosalen ligand (MnSalen),and the polymeric chains are further assembled into a 2D supramolecular network structure via strong intermolecular hydrogen bonding interactions between the adjacent zigzag chains.     

低温凝胶燃烧法合成Y2O3∶Er3+，Yb3+纳米晶上转换发光材料

分别以柠檬酸和甘氨酸为燃烧剂,采用低温凝胶燃烧法合成了Er³⁺、Yb³⁺共掺Y₂O₃纳米晶粉体。通过TG-DSC、XRD、SEM等分析手段对两种燃烧剂所对应的反应过程及纳米晶粉体的物理性能进行了分析,结果表明甘氨酸法具有更高的反应效率、更好的粉体分散性及粒径均匀性。在980 nm激光二极管(LD)激发下,对甘氨酸法所得样品的上转换发光性能分析表明,绿光和红光发射谱带分别来自于Er³⁺的⁴S_3/2/ ²H_11/2→ ⁴I_15/2和⁴F_9/2→ ⁴I_15/2跃迁。此外,对Er³⁺和Yb³⁺掺杂浓度、粉体煅烧温度对纳米晶样品上转换发光性能的影响进行了讨论。     

Synthesis,structure and photoluminescence of two porous metal-organoboron frameworks with rtl topology

Rigid trigonal tris(3-pyridylduryl)borane L was synthesized through four steps in good overall yield from readily available 1,2,4,5-tetramethylbenzene and was used to construct two porous cadmium(II) complexes Cd(L)X2.G(X = Cl,Br;G = guset molecules),1(Cd(L)Cl2.EtOH.iPrOH.3H2O) and 2(Cd(L)Br2.MeOH.C7H8.3H2O),under mild reaction conditions.1 and 2 are isostructural and featured with 3D porous metal-organoboron framewoks with rtl topology,in which L acts as a 3-connected node while a dicadmium motif serves as...     

Semiclassical Method to Schroedinger Equation with Position-Dependent Effective Mass

In this paper, two novel semiclassical methods including the standard and supersymmetric WKB quantization conditions are suggested to discuss the Schroedinger equation with position-dependent effective mass. From a proper coordinate transformation, the formalism of the Schroedinger equation with position-dependent effective mass is mapped into isospectral one with constant mass and therefore for a given mass distribution and physical potential function the bound state energy spectrum can be determined easily by above method associated with a simple integral formula. It is shown that our method can give the analytical results for some exactly-solvable quantum systems.     

司帕沙星与对硝基酚荷移反应的研究

本文主要研究在水溶液中 ,司帕沙星与对硝基酚发生反应 ,生成稳定的 1∶ 1的络合物 ,其最大吸收波长为 397.0 nm,线性范围 0 .9— 30 μg/ m L。表观摩尔吸光系数 ε=4 .0 7× 10 4 L·mol-1·cm-1,基于以上反应建立本方法 ,用于测定药物制剂中的司帕沙星含量与文献方法一致 ,回收率为 99.60 %— 10 0 %,相对标准偏差为 1.93%。     

烷基取代酮羰基n→π~*跃迁的光谱规律

本文提出了开链酮化合物n→π跃迁的λ_(max)与酮羰基α-,β-位碳上烷基取代关系的经验公式。     

Cu_2O室温电调制反射激子光谱

本文用电解液电调制反射谱方法;研究了室温下Cu_2O的青系蓝系激子谱.实验结果用最小二乘法对Aspens的理论进行了曲线拟合.将拟合结果与低温和室温下的反射、吸收谱数据进行比较,得到在电解液电反射谱中,不仅有青系.系n=1的激子效应,而且也包含n=2的激子效应.文中也做了不同抛光表面样品的电反射谱;发现它们有显著不同的光谱特征.     

茜素分光光度法测定磷霉素钠

在乙醇体系中,磷霉素钠与茜素发生反应,生成稳定的1∶1的络合物,溶液颜色发生明显改变,其最大吸收波长为545nm,磷霉素钠的浓度在1.4—60mg·L-1范围内遵守比耳定律,表观摩尔吸光系数ε=3.47×103L·mol-1.cm-1,基于以上反应,本方法测定药物制剂含量与文献方法一致,回收率在99.6%—100.5%之间,结果满意。