东方红-60推土机车架强度分析

<正> 一、问题的提出推土机车架是按装推土机各部件(发动机、减速器、后桥和驾驶座等)的基础。车架除承受这些部件的重量以及由此引起的动负荷外,还承受相当大的履带工作张力以及地面作用于车轮正向和侧向的阻力。因此在实际工作中,车架各杆件均处于拉、扭、弯、压同时作用的这一复杂而又繁重的工作载荷条件下。由于车架是推土机的基础,不管车架是变形还是损坏都会直接影响到推土机的正常使用。因此,必须保证车架有足够的强度和刚度。

C_(60)自组装单分子膜的制备及其摩擦特性

利用胺基与C60 分子的加成反应 ,在 3 胺基丙基 三乙氧基硅烷 (APS)的自组装单分子膜 (SAMs)表面上成功的制备了与基底化学键结合的C60 SAMs。其表面水接触角约为 76° ,膜厚约为 1.15nm ,AFM形貌像显示其表面光滑、均匀 ,基本不含缺陷。摩擦学结果表明 ,APS自组装单分子膜由于其分子链短 ,膜的有序性差 ,表面颗粒聚集物及“针孔”等缺陷多 ,而不具有润滑作用。当在其上形成C60 单分子层膜后 ,表现出优异的摩擦学性能 ,摩擦系数约为 0 .0 9～ 0 .13,在给定实验条件下抗磨损寿命大于 10 0 0 0次 ,有望作为微型机械的边界润滑材料使用。

Teorías y líneas de investigación en el sistema de franquicia: una revisión desde los años 60 hasta 2009

[ES] Diversos trabajos han analizado el sistema de franquicia y señalado las líneas principales de investigación con respecto a los trabajos científicos publicados hasta el momento (Elango y Fried, 1997; Díez de Castro y Rondán, 2004). El presente artículo pretende continuar este proceso y además, identificar las teorías aplicadas al estudiar el sistema de franquicia -teoría de la agencia, teoría de la escasez de recursos, teoría de la extensión del riesgo, teoría contractual, teoría de los costes de transacción y teoría de las señales-, explicando las contribuciones que realiza cada una de ellas a la literatura.

微重力落管法制备Nd_(60)Al_(10)Fe_(20)Co_(10)非晶薄片的磁性能研究

采用微重力落管法制得了Nd6 0 Al1 0 Fe2 0 Co1 0 非晶薄片 .利用X衍射 (XRD)分析了Nd6 0 Al1 0 Fe2 0 Co1 0 非晶薄片的结构特征 .用振动样品磁强计 (VSM)研究了其磁性能 .结果表明微重力落管法制得的非晶薄片具有硬磁性 ,与快速非平衡凝固(如甩带法 )试样的XRD相比 ,尽管其曲线还是较为典型的非晶相漫散衍射峰 ,但已有少量的不规则的类似晶化的突起小峰 ,表明该非晶片中已经有微量晶态合金或者细小晶粒析出 ,初步分析可能是生成了类似于亚稳A1 相的短程有序原子团簇或者是较大尺寸的纳米晶 ,这种短程有序原子团簇或纳米晶是Nd6 0 Al1 0 Fe2 0 Co1 0 非晶薄片显示硬磁性的主要原因

Aquaculture Asia, Vol.13, No.3, pp.1-60, July-September 2008

Comments on possible improvements to carp culture in Andhra Pradesh. Aquaculture and environmental issues in the region of Nai Lagoon, Ninh Hai district,Ninh Thuan province, Viet Nam. Climate change impacts on fi sheries and aquaculture. New initiatives in fisheries extension. Selection potential for feed efficiency in farmed salmonids. Freshwater prawn hatcheries in Bangladesh: Concern of broodstock. Production of Cirrhinus molitorella and Labeo chrysophekadion for culture based fisheries development in Lao PDR 2: Nursery culture and grow-out. Mussel farming: alternate water monitoring practice. Benefit-cost analysis for fi ngerling production of kutum Rutilus frisii kutum (Kamensky, 1901)in 2005 in Iran. The effects of feeding frequency on FCR and SGR factors of the fry of rainbow trout,Oncorhynchus mykiss. Asia-Pacific Marine Finfish Aquaculture Network Magazine: The use of poultry by-product meals in pelleted feed for humpback grouper. Production update – marine finfish aquaculture in the Asia-Pacific region. Crustacean parasites and their management in brackishwater finfish culture. NACA Newsletter

Nd_(60)Al_(10)Fe_(20)Co_(10)大块金属玻璃的玻璃转变和晶化过程

本文利用DSC、X射线衍射和动态力学分析以及扫描电子显微镜研究了Nd_(60)Al_(10)Fe_(20)Co_(10)大块金属玻璃(BMG)的玻璃转变和晶化过程。结果表明,合金的动态力学分析结果清楚地反映出材料的玻璃转变和晶化过程。由此确定材料的玻璃转变温度为493K,初始晶化温度为590K。X射线衍射和组织分析表明合金的晶化过程为:非晶α→非晶α’+未知亚稳NdFeAl相→非晶α’+初晶δ相→初晶δ相+共晶δ相+Nd_3Co+Nd_3Al。

Cruise Report 60-S-6, Trawl

(PDF contains 2 pages.)

Cruise Report 60-S-5-Shrimp

(PDF contains 3 pages.)

Cruise Report 60-S-2-Shrimp

(PDF contains 6 pages.)

让舰艇练就护体内功:抗冲击能力——中国舰船史600年和60年的思考

@@ 2009年4月23日,在中国人民海军创立60周年之际,中央军委主席胡锦涛在青岛奥帆中心附近海域检阅了多国海军舰队.阅兵开始,中国海军的导弹驱逐舰、护卫舰、核潜艇跃现海面,举世瞩目,见证了中国"建设一支强大的人民海军"的步伐.

I. Reactively sputtered Ti-Si-N thin films for diffusion barrier applications. II. Oxidation, diffusion and crystallization of an amorphous Zr_(60)Al_(15)Ni_(25) alloy.

Films of Ti-Si-N obtained by reactively sputtering a TiSi_2, a Ti_5Si_3, or a Ti_3Si target are either amorphous or nanocrystalline in structure. The atomic density of some films exceeds 10^23 at./cm^3. The room-temperature resistivity of the films increases with the Si and the N content. A thermal treatment in vacuum at 700 °C for 1 hour decreases the resistivity of the Ti-rich films deposited from the Ti_5Si_3 or the Ti_3Si target, but increases that of the Si-rich films deposited from the TiSi_2 target when the nitrogen content exceeds about 30 at. %.

Ti_(34)Si_(23)N_(43) deposited from the Ti_5Si_3 target is an excellent diffusion barrier between Si and Cu. This film is a mixture of nanocrystalline TiN and amorphous SiN_x. Resistivity measurement from 80 K to 1073 K reveals that this film is electrically semiconductor-like as-deposited, and that it becomes metal-like after an hour annealing at 1000 °C in vacuum. A film of about 100 nm thick, with a resistivity of 660 µΩcm, maintains the stability of Si n+p shallow junction diodes with a 400 nm Cu overlayer up to 850 °C upon 30 min vacuum annealing. When used between Si and Al, the maximum temperature of stability is 550 °C for 30 min. This film can be etched in a CF_4/O_2 plasma.

The amorphous ternary metallic alloy Zr_(60)Al_(15)Ni_(25) was oxidized in dry oxygen in the temperature range 310 °C to 410 °C. Rutherford backscattering and cross-sectional transmission electron microscopy studies suggest that during this treatment an amorphous layer of zirconium-aluminum-oxide is formed at the surface. Nickel is depleted from the oxide and enriched in the amorphous alloy below the oxide/alloy interface. The oxide layer thickness grows parabolically with the annealing duration, with a transport constant of 2.8x10^(-5) m^2/s x exp(-1.7 eV/kT). The oxidation rate is most likely controlled by the Ni diffusion in the amorphous alloy.

At later stages of the oxidation process, precipitates of nanocrystalline ZrO_2 appear in the oxide near the interface. Finally, two intermetallic phases nucleate and grow simultaneously in the alloy, one at the interface and one within the alloy.

Front pages with contents of No. 60, 1999

Front cover. Table of Contents.

Back pages of No. 60, 1999

Charles Darwin Foundation for the Galapagos Islands. Map.

Corpo, subjetividade e política: o ideário libertário das décadas de 60 e 70 em uma revista de jornalismo da psicologia

A pesquisa se debruça sobre o ideário dos anos 60 e 70, investigando como este repercutiu e se manifestou no contexto brasileiro, sobretudo em um determinado nicho do campo psi muito influenciado pelas idéias libertárias e antiautoritárias que reverberaram no período. Para tanto, tomei como objeto de pesquisa a revista de psicologia Rádice, publicação alternativa escrita, majoritariamente, por psicólogos recém-formados, estudantes de psicologia e jornalistas, que circulou entre 1976 e 1981. Entre outros assuntos, Rádice abordou temas relativos à loucura, sexualidade, psicanálise, relações familiares e ecologia. Através da análise deste objeto, interessa-me compreender melhor como a psicologia brasileira se politiza nos anos 70, assumindo uma postura ativista, militando em torno de diversas causas, como a oposição à ditadura militar, a luta antimanicomial e a discussão em torno da desrepressão sexual e liberação dos costumes. Ao mesmo tempo, o processo de transformação individual passa a ser concebido como o único caminho para a transformação da sociedade, fazendo com que a subjetividade se torne um espaço político. Pretendo investigar, portanto, um momento de encontro entre política, subjetividade e corpo, e o surgimento de uma nova prática política que se distancia das grandes questões e da doutrina revolucionária marxista, preocupando-se com o cotidiano, questionando hábitos, comportamentos e formas de relação social.