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    • 3. 发明申请
    • HIGH STRENGTH ALUMINUM ALLOY FOR HIGH TEMPERATURE APPLICATIONS
    • 高强度铝合金高温应用
    • WO2003087417A1
    • 2003-10-23
    • PCT/US2003/010372
    • 2003-04-03
    • THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (NASA)
    • LEE, Jonathan, A.CHEN, Po-Shou
    • C22C21/02
    • C22C21/04C22C32/00C22C49/06C22F1/043
    • A cast article from an aluminum alloy has improved mechanical properties at elevated temperatures. The cast article has the following composition in weight percent: Silicon 6.0 - 25.0, Copper 5.0 - 8.0, Iron 0.05 - 1.2, Magnesium 0.5 - 1.5, Nickel 0.05 - 0.9, Manganese 0.05 -1.2, Titanium 0.05 - 1.2, Zirconium 0.05- 1.2, Vanadium 0.05 - 1.2, Zinc 0.05 - 0.9, Strontium 0.001 - 0.1, Phosphorus 0.001 - 0.1, and the balance is Aluminum, wherein the silicon-to-magnesium ratio is 10 - 25, and the copper-to-magnesium ratio is 4 - 15. The aluminum alloy contains a simultaneous dispersion of three types of A13X compound particles (X= Ti, V, Zr) having a L1 2 crystal structure, and their lattice parameters are coherent to the aluminum matrix lattice. A process for producing this cast article is also disclosed, as well as a metal matrix composite, which includes the aluminum alloy serving as a matrix containing up to about 60% by volume of a secondary filler material.
    • 来自铝合金的铸造制品在升高的温度下具有改善的机械性能。 铸造制品具有以下重量百分比的组成:硅6.0-25.0,铜5.0-8.0,铁0.05-1.2,镁0.5-1.5,镍0.05-0.9,锰0.05-1.2,钛0.05-1.2,锆0.05-1.2 ,钒0.05〜1.2,锌0.05〜0.9,锶0.001〜0.1,磷0.001〜0.1,余量为铝,硅与镁的比例为10〜25,铜与镁的比例为4 铝合金包含具有L12晶体结构的三种类型的A13X化合物颗粒(X = Ti,V,Zr)的同时分散,其晶格参数与铝基质晶格相干。 还公开了一种用于生产该铸造制品的方法,以及金属基质复合材料,其包括用作基质的铝合金,其含有高达约60体积%的第二填料材料。
    • 5. 发明申请
    • SPACE ENVIRONMENTALLY DURABLE POLYIMIDES AND COPOLYIMIDES
    • 空间环境中的耐久性POLYIMIDES和COPYYIMIDES
    • WO2002092654A2
    • 2002-11-21
    • PCT/US2002/015837
    • 2002-05-17
    • THE GOVERNMENT OF THE UNITED STATES OF AMERICA as represented by THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (NASA)
    • C08G
    • C08G73/1071C08G73/10C08G73/1014C08G73/1039C08G73/1057C08G73/1067
    • Polyimides displaying low color in thin films, atomic oxygen resistance, vacuum ultraviolet radiation resistance, solubility in organic solvents in the imide form, high glass transition (T g ) temperatures, and high thermal stability are provided. The poly(amide acid)s, copoly(amide acid)s, polyimides and copolyimides are prepared by the reaction of stoichiometric ratios of an aromatic dianhydride with diamines which contain phenylphosphine oxide groups in polar aprotic solvents. Controlled molecular weight oligomeric (amide acid)s and imides can be prepared by offsetting the stoichiometry according to the Carothers equation using excess diamine and endcapping with aromatic anhydrides. The polyimide materials can be processed into various material forms such as thin films, fibers, foams, threads, adhesive film, coatings, dry powders, and fiber coated prepreg and uses include thin film membranes on antennas, second-surface mirrors, thermal optical coatings, and multi-layer thermal insulation (MLI) blanket materials.
    • 提供在薄膜中显示低颜色的聚酰亚胺,原子氧电阻,真空紫外线辐射抗性,在酰亚胺形式的有机溶剂中的溶解度,高玻璃化转变温度(T> g )和高热稳定性。 聚(酰胺酸),共聚(酰胺酸),聚酰亚胺和共聚酰亚胺通过芳族二酐与极性非质子溶剂中含有苯基氧化膦基团的二胺的化学计量比的反应来制备。 控制分子量的低聚(酰胺酸)和酰亚胺可以通过使用过量的二胺和用芳族酸酐封端根据Carothers方程来抵消化学计量来制备。 聚酰亚胺材料可以加工成各种材料形式,如薄膜,纤维,泡沫,螺纹,粘合剂膜,涂料,干粉和纤维涂层预浸料,其用途包括天线上的薄膜,第二表面镜,热光学涂层 ,和多层保温(MLI)覆盖材料。
    • 8. 发明申请
    • A SMOOTH-WALLED FEEDHORN
    • 一个光滑的前馈
    • WO2011044510A2
    • 2011-04-14
    • PCT/US2010/052068
    • 2010-10-08
    • THE JOHNS HOPKINS UNIVERSITYTHE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (NASA), GODDARD SPACE FLIGHT CENTERBENNETT, Charles, L.ZENG, LingzhenWOLLACK, Edward, J.CHUSS, David, T.
    • BENNETT, Charles, L.ZENG, LingzhenWOLLACK, Edward, J.CHUSS, David, T.
    • H01Q13/02
    • H01Q13/0283H01Q13/02Y10T29/49016Y10T29/49018
    • A device for at least one of receiving and transmitting electromagnetic radiation includes a feedhorn having a substantially smooth, electrically conducting inner surface extending from an open end to a feed end, the inner surface being substantially rotationally symmetrical about a longitudinal axis, wherein an orthogonal distance from a point on the longitudinal axis to the substantially smooth, electrically conducting inner surface increases monotonically as the point on the longitudinal axis is selected at successively greater distances from the feed end of the feedhorn towards the open end of the feedhorn such that a profile of the substantially smooth, electrically conducting inner surface of the feedhorn is monotonically increasing. The feedhorn has an operating bandwidth and the feedhorn provides a maximum of -30 dB cross polarization response over at least 15% of the operating bandwidth. A method of producing a feedhorn for receiving or transmitting electromagnetic radiation includes determining a profile of an inner surface of the feedhorn based on constraints required to achieve a plurality of operating parameters, providing a pre-machined feedhorn having an initial inner surface, and machining the initial inner surface of the pre-machined feedhorn to substantially match the profile determined to achieve the plurality of operating parameters for the feedhorn. The determining the profile includes a constraint for the profile to be a monotonically increasing profile relative to a rotational symmetry axis of the inner surface of the feedhorn going from a narrow end to a wide end of the feedhorn.
    • 用于接收和传送电磁辐射中的至少一个的装置包括馈电喇叭,该馈电喇叭具有从开口端延伸到馈送端的基本平滑的导电内表面,该内表面基本上关于旋转对称 纵向轴线,其中从纵向轴线上的点到基本光滑的导电内表面的正交距离单调地增加,因为纵向轴线上的点在从馈源角的馈送端朝向开放端 使得喇叭天线的基本光滑的导电内表面的轮廓单调增加。 馈源角具有工作带宽,馈源角至少在工作带宽的15%上提供最大-30 dB的交叉极化响应。 生产用于接收或传输电磁辐射的馈源喇叭的方法包括基于实现多个操作参数所需的约束来确定馈源喇叭的内表面的轮廓,提供具有初始内表面的预加工喇叭天线, 预加工的喇叭口的初始内表面基本上匹配确定为实现饲养喇叭的多个操作参数的轮廓。 确定轮廓包括相对于从喇叭口的狭窄端到宽端的馈源喇叭的内表面的旋转对称轴的轮廓的单调递增轮廓的约束。