Structure of spacetime tangent bundle

The universal upper limit on attainable proper acceleration relative to the vacuum imposes restrictions on possible structures in the spacetime tangent bundle. Various features of the differential geometry of the spacetime tangent bundle are presented here. Also, a modified Schwarzschild solution is obtained, and the associated gravitational red shift is calculated.     

卡瓦内酯对小鼠抗急性缺氧能力的影响

目的：研究卡瓦内酯对小鼠抗缺氧能力的影响。方法：耐急性缺氧能力、镇静作用和肌内松驰作用选用小鼠进行观察，红细胞和血红蛋白的分析按常规方法进行。结果：卡瓦内酯级明显提高小鼠耐急性缺氧能力，同时具有镇静和肌肉松驰作用，但未见到红细胞数和血红蛋白含量的增加。结论：卡瓦内酯能提高小鼠耐急性缺氧能力，与红细胞数量和血红蛋白的含量无关。可能的机制是降低了小鼠的耗氧量，从而提高了小鼠的耐急性缺氧的能力。     

催化褪色光度法测定痕量钛(Ⅳ)的研究

本文发现在硫酸介质中,钛(Ⅳ)催化高碘酸钾氧化中性红褪色的新指示反应,研究了反应的动力学条件,建立了催化褪色光度法测定痕量钛(Ⅳ)的新方法,灵敏度为2.8×10~(-11)Ti~(4+)/ml。     

互变异构激光染料奇通红发光特性研究

本文报道应用微微秒脉冲技术测量奇通红染料荧光寿命,发现该体系荧光衰减呈现双指数衰减形式,证实了奇通红染料分子的互变异构特性.     

High-efficiency Red Electrofluorescence Devices Employing a Rhenium Complex as Phosphorescent Sensitizer

Efficiencies of up to 7.81 cd/A and brightness of 8843 cd/m² are obtained based on green–yellow phosphorescent material, fac 4, 4′-bi (tert-butyl)-2, 2′-bipyridine Re(CO)₃Cl[(Bu ^t bpy)Re(CO)₃Cl] doped into 4,4′-N,N′-dicarbazole-biphenyl (CBP) host. We also fabricate high-efficiency red devices by introduction of (Bu^tbpy)Re(CO)₃Cl as a sensitizer, and the undoped ultrathin layer 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) as fluorescent acceptor. Förster energy of triplet and singlet are efficient due to appropriate overlap between emission spectrum of (Bu ^t bpy)Re(CO)₃Cl and absorption spectrum of DCJTB.     

白光LED用红色荧光粉Gd2Mo3O9：Eu3+的制备及表征

利用Na₂CO₃作为助熔剂,采用高温固相反应方法制备了三价铕离子激活的Gd₂Mo₃O₉红色荧光粉。利用XRD和荧光光谱,研究了助熔剂的量、制备时的温度以及激活剂Eu³⁺的浓度对荧光粉的晶体结构和发光性能的影响。测试结果表明,这种新型的荧光粉可以被紫外光280nm,近紫外光395nm和蓝光465nm有效激发,发射主峰位于613nm,并且证明Eu³⁺离子在晶体结构中占据了非反演对称中心的位置。395,465nm的吸收与目前广泛应用的紫外和蓝光LED芯片的输出波长相匹配。因此,这种荧光粉是一种可能应用在白光LED上的红色荧光粉材料。     

LD侧泵Nd∶YAG/S-KTP腔内倍频高功率660nm连续红光激光器

报道了LD侧面泵浦Nd∶YAG/S-KTP腔内倍频高功率660nm连续红光激光器。泵浦组件（呈三角形等间距分布）由9个20W的激光二极管组成，最大泵浦功率为180W。通过对谐振腔参数进行优化设计，用LD连续抽运3mm×65mm Nd∶YAG激光棒时，获得了波长为1319nm的基频光振荡。利用S-KTP II类临界相位匹配腔内倍频技术，当泵浦电流为22A时，获得了6.8W的连续红光激光输出，光-光转换效率为4.3％。     

Mechanism of Intramolecular Transfer of a Proton and an Electron in an Excited State of 4′‐Amine Derivatives of 3‐Hydroxyflavone

The intramolecular transfer of a proton in 4amine derivatives of 3hydroxyflavone was investigated in binary solvents, which are a mixture of polar and nonpolar liquids. The dependence of the efficiency of the intramolecular transfer of a proton in an excited state on the frequency of the exciting light has been revealed, which is due to the spectral inhomogeneity of the molecules of fluorophors in binary solvents. A scheme of the processes of intramolecular transfer of a proton and an electron in 4amine derivatives of 3hydroxyflavone is suggested.     

The Role of Intermediates in the Process of Red Ferric Pigment Manufacture from FeSO4⋅7H2O

One method of industrial manufacture of red ferric pigments is based on the thermal decomposition of FeSO₄7H₂O into -Fe₂O₃(copperas red). The difficult reproducibility of the color quality of the final pigment is the main problem of this process. One of the factors that can influence the pigment color is contamination by some of the intermediates formed during the transformation process. The identification of two groups of intermediates is the basic result of an extensive laboratory investigation carried out using ⁵⁷Fe Mössbauer spectroscopy and X-ray powder diffraction (XRD). The first group of intermediates includes sulfato-phases as FeSO₄H₂O, FeSO₄, Fe(OH)SO₄, Fe₂O(SO₄)₂, Fe₂O(SO₄)₂xH₂O x(0,1), and Fe₂(SO₄)₃. Thermally metastable polymorphs of iron(III) oxide, -Fe₂O₃, -Fe₂O₃ and -Fe₂O₃, represent the other group. Mössbauer characterization of all intermediate products is given. A significant influence of -Fe₂O₃ on the pigment color was found.