The reactivity of lanthanide alkyl compounds with phenylacetylene: Synthesis and structure of [(Bu(t)Cp)(2)LnC CPh](2) (Ln=Nd, Gd)

[(Bu(t)Cp)(2)LnCH(3)](2) (Ln = Nd, Gd) react with PhC=CH to form the dimeric alkynide-bridged complexes [(Bu(t)Cp)(2)LnC=CPh](2) [Ln = Nd (I), Gd (II)]. Both compounds crystallized from toluene in the monoclinic space group C2/c. The two complexes are homologous, composed of asymmetric metal-alkynide bridges with Nd-C, Gd-C (alkynide) bond lengths of 2.602(4), 2.641(5) (I) and 2.532(6), 2.601(7) Angstrom (II), respectively. The average Nd-C (ring) and Gd-C (ring) distances are 2.746(13) and 2.703(19)Angstrom.

Ba_2Pr_xLn_(1-x)Cu_3O_(7-δ)(Ln=Y,Nb,Yb,0≤X≤1)体系中Cu-O链及Cu-O层对超导作用的探讨

本文合成了 Ba_2P_(rx)Ln_(1-x)Cu_3O_(7-δ)系列化合物,测量了它们的超导电性(Tc),当 x=0.1,T_c(L_n=Y)=78.5K,T_c(Yd)=88K、T_c(Nd)<77K。晶胞参数及正交畸变与组成的变化图表明稀土元素的离子半径影响显著,讨论了 Ba_2LnCu_3O(7-δ)体系中 Cu-O 链、Cu-O 层及 Cu~(3+)对超导电性的作用,当 Ln 的价态界于三、四价之间时(如Pr),四价的成份越多,Cu~(3+)的量就越少,虽然正交畸变很大,但 T_c 降低。

Characteristics of anodic coatings oxidized to different voltage on AZ91D Mg alloy by micro-arc oxidization technique

With increasing applied voltage, three types of anodic coatings, passive film, micro-spark ceramic coating and spark ceramic coating were made by micro-arc oxidization (MAO) technique on AZ91D magnesium alloy in alkali-silicate solution. The structure, composition characteristics and the electrochemical properties of coatings were also studied with SEM, XRD and EIS (electrochemical impedance spectroscopy) technique, respectively. It is found that the electrochemical properties are closely related to the structure and composition characteristics of the anodic coatings. At the same time, the characteristics of the three types of anodic coatings differ significantly, among them, the micro-spark ceramic coating, prepared in the voltage range of 170similar to220V exhibits compact, homogeneous structure and highest corrosion-resistance.

Formation of nano-crystalline corrosion products on Zn-Al alloy coating exposed to seawater

Hot dip Zn-Al alloy coating performs better than hot dip galvanized coating and 55% Al-Zn-Si coating as well with regard to general seawater corrosion protection. A characterization of the corrosion products on Zn-Al alloy coating immersed in dynamic aerated seawater has been performed mainly based on transmission electron microscopy (TEM) for morphological analysis and X-ray diffraction (XRD) technique for crystalline phase identification. The XRD and TEM analyses showed that the corrosion products mainly were typical nanometer Zn4CO3(OH)(6).H2O, Zn-5(OH)(8)Cl-2 and Zn6Al2CO3(OH)(16). 4H(2)O microcrystals. This probably is connected to the co-precipitation of Zn2+ and Al3+ ions caused by adsorption. Zn-Al alloy coating being suffered seawater attacks, AI(OH)(3) gel was first produced on the coating surface. Zn and Al hydroxides would co-precipitate and form double-hydroxide when the concentration of adsorbed Zn2+ ions by the newly produced gel exceeded the critical degree of supersaturation of the interphase nucleation. However, because the growth of the crystals was too low to keep in step with the nucleation, a layer of nano-crystalline corrosion products were produced on the surface of the coating finally. (C) 2001 Elsevier Science Ltd. All rights reserved.

Study on growth factors of intermetallic layer within hot-dipped 25% Al-Zn alloy coating on steel

25%Al-Zn alloy coating performs better than hot dip galvanized coating and 55%Al-Zn-Si coating with regard to general seawater corrosion protection. This study deals with the interfacial intermetallic layer's growth, which affects considerably the corrosion resistance and mechanical properties of 25%Al-Zn alloy coatings, by means of three-factor quadratic regressive orthogonal experiments, The regression equation shows that the intermetallic layer thickness decreases rapidly with increasing content of Si added to the Zn-Al alloy bath, increases with rise in bath temperature and prolonging dip time. The most effective factor that determined the thickness of intermetallic layer was the amount of Si added to Zn-Al alloy bath, while the effect of bath temperature and dip time on the thickness of intermetallic layer were not very obvious.

Corrosion resistance of hot-dipped zinc and zinc alloy coated sheet steels under offshore atmospheric environment

The application of hot-dipped zinc and zinc-aluminum alloy coatings were introduced. Exposure tests of the steels with these coatings were conducted in the offshore atmosphere in Qingdao and Xiamen for 12 years separately. Effects of the coating thickness, alloy composition and atmospheric environment on the corrosion performance were studied. Results of the onsite exposure tests were compared with the results of a previous indoor salt spray accelerated corrosion tests. The study supports that zinc-aluminum alloy coatings are useful in providing better corrosion resistance and can be further developed for future applications.

Corrosion resistance of steel with hot-dipped galvanized zinc and zinc alloy coatings in seawater

Hot-dipped galvanized zinc and zinc alloy coatings were used as the hot-dipped low alloy zinc coatings (aluminum content less than protective metallic coatings for steel structures in seawater in Chi- or equal to 10 wt%) is equal to or even lower than that of the pure na. Corrosion of the two coatings immersed in sea water in Qingdao zinc sheet, while the performance of the hot-dipped high alloy zinc and Xiamen for 6 years were introduced and analyzed, which pro-coatings is higher than that of the pure zinc sheet. The hot-dipped vides a basis for further development and applications of these coat- high alloy zinc coatings can be further developed for optimal tings in China. Tests proved that the anti-corrosion performance of formance in the future.

Inteligencia Emocional y Comunicación: la conciencia corporal como recurso

Los cambios producidos en los procesos de enseñanza– aprendizaje requieren de los docentes formación competencial que motive a los alumnos para que sean capaces de desarrollarse como personas y realizar aprendizajes significativos a lo largo de toda su vida. En línea con este objetivo es necesaria una formación específica del profesorado que promueva el desarrollo de las competencias de tipo emocional. En el contexto educativo, una de las claves del éxito (la consecución de un proceso de enseñanza–aprendizaje efectivo y de calidad) se encuentra en el modo en el cual se establecen las dinámicas interpersonales. Un buen docente es aquel que no sólo “sabe”, sino que “es”. La presencia del docente en el aula, su cercanía al alumno, su capacidad para gestionar sus emociones, para comunicarse de modo eficaz y empatizar con él, son todos ellos aspectos que inciden sin lugar a dudas en el clima de trabajo, en el grado de motivación del alumno, en los resultados de aprendizaje, y claro está, en su desarrollo personal. Cuando hablamos de aspectos comunicativos, aquellos de tipo no verbal cobran una gran importancia. Los docentes apenas reciben formación de tipo experiencial sobre aspectos relacionados con la presencia del cuerpo y su expresión. El conocimiento enactivo a través de un programa de concienciación corporal y comunicación no –verbal posibilita el desarrollo de competencias intra e interpersonales. Se presentan en este trabajo los resultados preliminares de un programa de formación realizado en este ámbito con profesores universitarios de distintas áreas de conocimiento.

Vida de S. Francisco Xavier de la Compania de Iesvs primero Apostol del Iapon, y segundo de la India, y de otras Prouincias del Oriente

Van añadidas en esta impression muchas cosas, cuya tabla se pone despues del prologo.

Defensa Critico-Historico-Canonico-Legal de la Ciudad de Pamplona, Metropoli y Cabeza de el Reyno de Navarra, y respuesta a la Dissertacion Historico-Canonica de el Prior, y Cabildo de la Iglesia Cathedral de la misma Ciudad, en las differencias, que han excitado sobre processiones

Signaturas: [ ]2, A-Z2, 2A-2Z2, 3A-3B2, [ ]1.

Memorias políticas y militares, para servir de continuacion a los Comentarios del Marques de San Felipe : desde el año de MDCCXXV, en que concluyó este autor su obra, hasta el presente, con los Tratados de Paz Y Alianzas de España correspondientes

Signaturas: [ ]1, A-Z4, 2A-2R4, 2S1.

Metrica expression, reverente en el dia ventvroso, que cumple años el Exc. Señor D. Balthasar de Zuñiga, y Guzman, Marques de Valero, y de Aya-monte, Gentil-Hombre de la Camara de su Mag. Virrey, y Capitan General del Reyno de Navarra, &c.. : ofrecela a svs pies sv mas humilde criado

Signaturas: A6.

Instruccion y Reglas de la Congregacion de San Luis Gonzaga

Signaturas: A-Q8/4.

Ilustracion apologetica al primero, y segundo tomo del Teatro critico : donde se notan mas de quatrocientos descuidos al Autor del Anti-Teatro ; y de los setenta, que éste imputa al Autor del Teatro Critico, se rebaxan los sesenta y nueve y medio

Signaturas: a-d4, A-Z4, 2A-2Z4, 3A-3H4.