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    • 1. 发明申请
    • GATED RECORDING OF HOLOGRAMS USING RARE-EARTH DOPED FERROELECTRIC MATERIALS
    • 使用稀土掺杂的电解材料进行埋藏记录
    • WO1997013251A1
    • 1997-04-10
    • PCT/US1996015816
    • 1996-10-02
    • SRI INTERNATIONALIBM CORPORATIONTHE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY
    • SRI INTERNATIONALIBM CORPORATIONTHE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITYBAI, Yu, ShengKACHRU, RavinderHESSELINK, LambertusMACFARLANE, Roger, M.
    • G11C13/04
    • B82Y10/00G11B7/0065G11B7/243G11B7/2433G11C13/042
    • Rare earth doped ferroelectric materials are disclosed as reversible holographic recording medium (25) for use in two-photon recording systems. Such rare earth elements provide long-lived electronic states intermediate the ferroelectric material's valence and conduction bands. In some cases, these rare earth intermediate states have a sufficiently long life that low-power continuous wave ("cw") lasers (1) can be used to record interference patterns on them. Thus, two-photon holographic recording systems are also disclosed which do not require high-power, short pulse length, mode-locked or Q-switched lasers. Rather, the disclosed holographic recording systems employ cw lasers such as diode lasers. The rare earth dopants include praseodymium, neodymium, dysprosium, holmium, erbium, and thulium. These dopants provide ions having 4f excited states that give rise to absorptions in the near infra-red and visible spectral regions and typically have lifetimes on the order of 0.1 to 1 milliseconds. The disclosed two-photon holographic recording systems provide for absorption of a first photon which excites electrons of a holographic recording medium to a rare-earth intermediate state. Thereafter, upon absorption of a second photon, the electrons are promoted to the medium's conduction band where they are arranged according to the interference pattern provided by the recording system.
    • 稀土掺杂的铁电材料被公开为用于双光子记录系统的可逆全息记录介质(25)。 这种稀土元素在铁电材料的价带和导带之间提供长寿命的电子态。 在某些情况下,这些稀土中间体具有足够长的寿命,可以使用低功率连续波(“cw”)激光器(1)来记录干涉图案。 因此,还公开了不需要大功率,短脉冲长度,锁模或Q开关激光器的双光子全息记录系统。 相反,所公开的全息记录系统采用诸如二极管激光器之类的cw激光器。 稀土掺杂剂包括镨,钕,镝,钬,铒和。。 这些掺杂剂提供具有4f激发态的离子,其在近红外和可见光谱区域中产生吸收,并且通常具有0.1至1毫秒量级的寿命。 所公开的双光子全息记录系统提供了将全息记录介质的电子激发到稀土中间状态的第一光子的吸收。 此后,在吸收第二光子时,电子被提升到介质的导带,它们根据由记录系统提供的干涉图案排列。
    • 5. 发明申请
    • PRECERAMIC SILICON POLYMERS
    • 先导硅聚合物
    • WO1994026806A1
    • 1994-11-24
    • PCT/US1994005466
    • 1994-05-17
    • SRI INTERNATIONAL
    • SRI INTERNATIONALBLUM, YigalMcDERMOTT, Gregory, A.
    • C08G77/62
    • C08G77/62C08G77/38C08G77/60
    • Novel methods for the preparation of polymers useful as precursors to ceramic materials by catalytic activation of Si-H bonds are disclosed. The methods comprise reacting, in the presence of a catalyst effective to activate Si-H bonds, Si-N bonds, or both, and/or a reactive solvent, a polymer in the form of a polysilane, polysilazane, polysiloxane or polycarbosilane with a reactant having the structural formula R-X-H, wherein X is NR' or O, R is H, organic, silyl, siloxyl, silazanyl or carboxilyl and may contain at least one additional X-H group, and R' is H, amino, silyl or silazanyl, to produce a modified polymer containing at least one Si-X bond. Polymers produced by these methods are also disclosed.
    • 公开了通过催化活化Si-H键制备可用作陶瓷材料前体的聚合物的新方法。 所述方法包括在有效活化Si-H键,Si-N键或两者的催化剂和/或反应性溶剂的存在下,将聚硅烷,聚硅氮烷,聚硅氧烷或聚碳硅烷形式的聚合物与 具有结构式RXH的反应物,其中X是NR'或O,R是H,有机,甲硅烷基,甲硅烷氧基,硅氮烷基或羧酰基,并且可以含有至少一个另外的XH基团,R'是H,氨基,甲硅烷基或硅氮烷基, 以产生含有至少一个Si-X键的改性聚合物。 还公开了通过这些方法制备的聚合物。