Thermal barrier coating of lanthanum-zirconium-cerium composite oxide made by electron beam-physical vapor deposition

Lanthanum-zirconium-cerium composite oxide (La-2(Zr0.7Ce0.3)(2)O-7, LZ7C3) as a candidate material for thermal barrier coatings (TBCs) was prepared by electron beam-physical vapor deposition (EB-PVD). The composition, crystal structure, thermophysical properties, surface and cross-sectional morphologies and cyclic oxidation behavior of the LZ7C3 coating were studied. The results indicated that LZ7C3 has a high phase stability between 298 K and 1573 K, and its linear thermal expansion coefficient (TEC) is similar to that of zirconia containing 8 wt% yttria (8YSZ). The thermal conductivity of LZ7C3 is 0.87 W m(-1) K-1 at 1273 K, which is almost 60% lower than that of 8YSZ. The deviation of coating composition from the ingot can be overcome by the addition of excess CeO2 and ZrO2 during ingot preparation or by adjusting the process parameters.

高效液相色谱-电喷雾质谱联用分析红参与五味子配伍机制

目的研究红参与五味子配伍过程中人参皂苷类化合物的变化机制。方法采用高效液相色谱-电喷雾质谱联用技术对红参与五味子5种配伍比例水煎液中人参皂苷的变化进行了研究。结果在五味子量较少的条件下,红参与五味子水煎液中人参皂苷Rg1、Re、Rb1、Rc、Rb2、Rd发生水解。随着五味子量的增加,人参皂苷Ro的量发生减少,而人参微量次级皂苷F2的量显著增加。结论红参与五味子配伍后产生的特殊药效可能与两者配伍过程中人参皂苷F2的量显著增加有关。

A novel 2D arsenic vanadate network grafted with a transition metal complex: [Cu(phen)][(VV4As2O19)-V-IV-As-V]center dot 0.5H(2)O

A novel organic-inorganic hybrid compound [Cu(phen)](2)[(VV4As2O19)-V-IV-As-V-O-V].0.5H(2)O 1 has been hydrothermally synthesized. Its structure, determined by single crystal X-ray diffraction, exhibits an unusual two-dimensional arsenic vanadate layered network grafted with the [Cu(phen)](2+) complex. The chelating phen ligands project perpendicularly beyond the inorganic layer. Variable temperature magnetic susceptibility studies indicate that both ferro- and antiferro-magnetic interactions exist in 1.

Novel two-dimensional sodium molybdenum phosphates containing {M(enMe)(2)}(2+) bridging groups (M = Ni, Cu; enMe=1,2-diaminopropane)

Two novel organic-inorganic hybrid compounds, (H(2)enMe)(4)(H3O)[Ni(enMe)(2)].[Na3Mo12O52P8(OH)(10)].5H(2)O (1) and (H(2)enMe)(4)(H3O)[Cu(enMe)(2)].[Na3Mo12O52P8(OH)(10)].5H(2)O (2) (enMe = 1,2-diaminopropane), have been hydrothermally synthesized and characterized by elemental analyses, IR, EPR, XPS, UV-Vis spectra and TG analyses. Single crystal X-ray diffraction shows that 1 and 2 are isostructural compounds. Both the compounds exhibit an unusual two-dimensional (2-D) window-like network consisting of one-dimensional (1-D) chains of sodium molybdenum phosphate anions connected by transition metal coordination complexes cations. Compound 1 and 2 represent the first 2-D molybdenum phosphate skeleton pillared by transition metal complex fragments.

人参四逆汤抗休克作用的有效组分成分分析

分析人参四逆汤抗失血性休克作用的提取组分 S- 1和 S- 7的组成成分。方法　结合硅胶色谱柱分离 ,利用 ESI/MSn、MAL DI- TOF/MS等技术分析鉴定 S- 1和 S- 7的化学成分。结果　从人参四逆汤水煎液的抗休克作用的有效组分 S- 7中分析和鉴定了人参皂苷 - Ra1 、- Ra2 、- Rb1 、- Rb2 、- Rb3、- Rc、- Rd、- Re、- Rg1 、- Rg2 、- Rg3、- Rf等 12种人参皂苷 ;从有效组分 S- 1中检出下列二萜生物碱成分 :苯甲酰次乌头碱油酸酯 (14 - benzoylhypaconine- 8-linoleate,HAL )、苯甲酰去氧乌头碱油酸酯 (14 - benzoyldeoxyaconine- 8- oleate,HAO )、苯甲酰次乌头碱棕榈酸酯(14 - benzoylhypaconine- 8- palmitate,HAP)、苯甲酰中乌头碱 (benzoylmesaconitine,BM)、苯甲酰乌头碱 (benzoyla-conitine,BA)、苯甲酰次乌头碱 (benzoylhypaconitine,BH)。结论...

人参四逆汤生物碱和皂苷成分的研究

研究人参四逆汤的有效成分。方法 :利用软电离质谱技术 ,对人参四逆汤的有效成分进行鉴定。结果 :从人参四逆汤水煎液中分析和鉴定了人参皂苷Ra1,Ra2 ,Rb1,Rb2 ,Rb3 ,Rc ,Rd ,Re,Rg1,Rg2 ,Rg3 ,Rf等 12种人参皂苷 ;苯甲酰中乌头碱 (BM )、苯甲酰乌头碱 (BA)、苯甲酰次乌头碱 (BH)、尼奥灵 (NL)、附子灵 (FL)、14 乙酰基塔拉地萨敏 (AT)、苯甲酰次乌头碱亚油酸酯 (HAL)、苯甲酰去氧乌头碱亚油酸酯 (HAO)、苯甲酰次乌头碱棕榈酸酯 (HAP)、塔拉地萨敏 (TS)等 10种二萜生物碱。结论 :含有脂肪酸酯型生物碱的提取组分具有抗休克作用 ,含有人参皂苷的提取组分具有明显的负性肌力作用。

The crystal structure and supramolecular chain of [La(NO3)(3)(OH2)(2)(phen)]center dot 15-crown-5

[La(NO3)(3)(OH2)(2)(phen)]. 15-crown-5 is hexagonal, P6(5), with a = 10.955(2), c = 43.769(9) Angstrom, and D-calc = 1.668 g cm(-3) for Z = 6. In the complex, two nitrogen atoms (from phen) and eight oxygen atoms (six from three bidentate nitrate anions and two from water molecules) are coordinated to the central La(III) ion, forming a coordination polyhedron which is approximately a bicapped square antiprism. The coordinated water molecules donate hydrogen bonds to the oxygen atoms of the crown ether, forming polymeric hydrogen bonded chains which wrap helically along the unit cell direction c.

THE SYNTHESIS AND CRYSTAL-STRUCTURE OF [LA(OH2)(5)(PHEN)(2)]CL-3-CENTER-DOT-4H(2)O-CENTER-DOT-PHEN

[La(OH2)(5)(phen)(2)]Cl-3 4H(2)O.phen is centric, Pnna, with a = 19.946(7), b = 16.458(5), c = 12.207(4)Angstrom and D-calc = 1.57 g cm(-3) for Z = 4. The La(III) ion resides on a crystallographic twofold axis and is coordinated to four nitrogen atoms (fr

STRUCTURE OF [LA(NO3)(3)(OH2)(2)(OHME)(BIPY)].15-CROWN-5

[La(NO3)(3)(OH2)(2)(OHMe)(bipy).15-crown-5 is monoclinic, P2(1)/n, with a = 11.239(6), b = 19.302(7), c = 14.458(8) Angstrom, beta = 92.47(5)degrees, and D-calc = 1.63 g cm(-3) for Z = 4. In the complex, two nitrogen atoms (from bipy) and nine oxygen atom

SYNTHESIS AND CHARACTERIZATION OF HETEROPOLY BLUES OF BIS-2/17 MOLYBDOPHOSPHATE COMPLEXES WITH LANTHANIDE

Eight heteropoly blues of bis-2:17 molybdophosphate complexes with Lathanide, i.e., K17H2[Ln(P2Mo17O61)2] . nH2O and K17H4[Ln(P2Mo17O61)2] . nH2O were synthesized and characterized by elemental analyses potentiometric titration, IR, UV, polarography, cyclic voltammetry, X-ray photoelectron spectra X-ray powder diffraction, thermal analyses and ESR. Experimental results show that the properties of these series of heteropoly blues are different from those of their oxidized form, but no great changes in their structures were observed. The ligand P2Mo17O6110- remains alpha2-isomer's configuration.

ISOLATION AND PROPERTIES OF MOLYBDENUM SERIES OF HETEROPOLY BLUE WITH KEGGIN STRUCTURE

The present paper reports the methods for preparing and isolating 8 kinds of 1:12 molybdenum series of heteropoly blue complexes KyHzXMo12O40 . nH2O (X=Si, P, As, Ge). The products were characterized by elemental analyses, potential titration, polarograms, cyclic voltammetry, IR spectra, visible-UV spectra, X-ray powder diffraction, XPS and P-31 NMR. The single crystal structure of 4-electron molybdenum-silicon heteropoly blue was measured and the positions of reduced molybdenum atoms were determined, i.e. they were located at Mo(3), Mo(7), Mo(8) and Mo(10). The experimental results show that the heteropoly blue remains Keggin structure. ESR spectra of heteropoly blue solids were first studied, from which it was found that the delocalization extent of 2-electron heteropoly blue and 4-electron heteropoly blue is smaller than that of 1-electron heteropoly blue. The study of thermal properties shows that the thermal stability increases with the increase of the reduction extent of heteropoly blue. The study of redox properties shows that the oxidizing power order of heteropoly blue changes in different mediums, and the polarographic half-wave voltage is found to be dependent on the electronegativity of the hetero atom linearly. It is found that the phosphorus heteropoly blue and arsenic heteropoly blue show a strong anti-acid property.

基于小波网络与模糊神经网络的非线性系统辨识方法的研究

非线性系统辨识是现代控制理论的一个重要分支，是人们认识非线性系统的理论基础。今年来，利用神经网络辨一识非线性系统，是非线性系统辨识理论i}jf究的热点，现己形成了比较完善的理论体系。本文以某种反坦克导弹武器系统的弹道轨迹辨识为背景，在研究神经网络的辨识理论基础上，更深入地研究了纂于小波网络与模糊神经网络的非线性系统辨识的方法。一方面完善了现有的理沦，另佩方面提出了几种新的算法，主要内容如下：(1)提出了一种基于输入变量重要性指标的神经网络输入变量选择算法，对候选输入变量的重要性进行降序排序，引入一种正规化准则函数作为性能指标，最终确定同时具有良好的逼近能力和泛化能力的输入组合。该算法同基于宽度优先的搜索树算法相比，效率明佩Ul-Ul-提高。(2)基于小波多分辨率分析理论，引入非正交的小波基，从低尺度到高尺度逐渐逼近，L2(Rd)上的非线性连续函数，并且引用递推思想对辨识的偏差再进行多分辨率辨识，这样既降低了对正交小波基的要求，又能以较高的精度来辨识。（3）针对高维非线性系统，提出一种基于正交化思想的小波网络的参数和结构辨识算法。提出递推正交最小二乘法RGLS实现对小波向量矩阵的正交分 解，同传统的CGS, MGS算法相比，ROLE算法计算量小，可实现权值参数的在线辨识。利用ROLS算法的结果，采用从复杂到简单及从简单到复杂两种思想进行结构辨识，结构辨识算法是在上三角矩阵上进行的，而不是在小波向量矩阵上进行的，且在上述两种结构辨识算法中都不需要 重新训练网络，计碑算量小，运行效率高。本文所提的小波网络辨识方法，改变以往小波网络受限于低维非线性系统的状况。（4）针对基于聚类的模糊神经网络对维数不敏感，国内外很多研究集中到聚类算法上。本文完善了Ching－Chang Wong等1999年，提出的一种新聚类算一法，并根据Brouwer不动点定理给出了算法收敛的理论证明，该聚类算法同其他聚类算法相比不需预先知道聚类数目及初始中心点的设置，且．有较好的聚类效果。在新聚类算法的基础上，建立一阶TSK模糊神经网络模型，进行非线性系统辨识，收到很好的辨识效果。（5）对Ching－Hung Lee等2000年，提出的一种递归型模糊神经网络，引入遗传算法来完善该网络的学习算法。利用新聚类算法的结果，对初始种群的个体进行初始化，避免了通常采用遗传算法由于初始值选择不当而产生的早熟问题。对种群中的个体采用实数编码，实现网络参数的全局寻优。