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    • 83. 发明授权
    • Polysiloxane-polyether block copolymer and method for the preraration
thereof
    • 聚硅氧烷 - 聚醚嵌段共聚物及其制备方法
    • US5767219A
    • 1998-06-16
    • US829423
    • 1997-03-31
    • Mitsuhiro TakaradaMasanao KameiHiroshi Sasaki
    • Mitsuhiro TakaradaMasanao KameiHiroshi Sasaki
    • C08G77/46C08G77/08
    • C08G77/46
    • Proposed is a novel polysiloxane-polyether block copolymer having excellent heat resistance, which is characterized by the molecular structure consisting of repetition of diorganopolysiloxane units and polyoxyalkylene units having a bisphenol linkage of the formula --O--Pn--CMe.sub.2 --Pn--O-- in the unit, Pn being a 1,4-phenylene group and Me is a methyl group. This polysiloxane-polyether block copolymer can be prepared by conducting a hydrosilation reaction between a diorganopolysiloxane terminated at each molecular chain end with a silicon-bonded hydrogen atom and a polyoxyalkylene compound having the bisphenol linkage in the molecule and terminated at each molecular chain end with an alkenyl group or, preferably, allyl group in the presence of a platinum catalyst. The stability of the block copolymer obtained by the hydrosilation reaction can be further improved, when the block copolymer has a silicon-bonded hydrogen atom as the terminal group, by reacting the silicon-bonded hydrogen atom with water or alcohol to be converted into a silanolic hydroxy group or alkoxy group.
    • 提出了一种具有优异耐热性的新型聚硅氧烷 - 聚醚嵌段共聚物,其特征在于由重复二有机聚硅氧烷单元和具有式-O-Pn-CMe2-Pn-O-双酚键的聚氧化烯单元组成的分子结构 单元,Pn为1,4-亚苯基,Me为甲基。 该聚硅氧烷 - 聚醚嵌段共聚物可以通过在每个分子链末端封端的二有机聚硅氧烷与硅键合的氢原子和在分子中具有双酚键的聚氧化烯化合物进行硅氢化反应并在每个分子链末端以 烯基或优选烯丙基。 通过氢硅化反应得到的嵌段共聚物的稳定性可以进一步提高,当嵌段共聚物具有与硅键合的氢原子作为端基时,通过使与硅键合的氢原子与水或醇反应以转化成硅烷醇 羟基或烷氧基。
    • 88. 发明授权
    • Image data coding apparatus and coding method
    • 图像数据编码装置和编码方法
    • US5073820A
    • 1991-12-17
    • US602162
    • 1990-10-23
    • Chihiro NakagawaHiroyuki FukudaHiroshi SasakiChikako MogiHidetoshi Yamada
    • Chihiro NakagawaHiroyuki FukudaHiroshi SasakiChikako MogiHidetoshi Yamada
    • H04N1/41G06T9/00
    • H04N19/00H04N19/126H04N19/15H04N19/176H04N19/18H04N19/192H04N19/146H04N19/152H04N19/30
    • An image data coding apparatus performs first and second coding processes. A controller outputs first and second control signals. An orthogonal transform circuit performs orthogonal transform on image data of one screen and generates an transformed output. A quantizing circuit quantizes the transformed output with a predetermined temporary first quantization width upon reception of the first control signal and generates a first quantized output, and quantizes the transformed output with an optimal second quantization width upon reception of the second control signal and generates a second quantized output. An entropy coding circuit codes the first quantized output and generates a first coded output, and codes the second quantized output and generates a second coded output. An amount-of-codes calculator calculates the amount of codes of the first coded output for each block and calculates the amount of codes of one screen based on the amount of codes for each block. An assigned-amount-of-codes determining circuit determines the amount of codes assigned to each block based on the amount of codes for each block and the amount of codes of the one screen, and the target amount of codes. A quantization width predicting circuit predicts the second quantization width based on the amount of codes of the one screen. A coding stop circuit supplies a coding stop signal to the entropy coding circuit when the amount of codes of the second coded output exceeds the assigned amount of codes.
    • 图像数据编码装置执行第一和第二编码处理。 控制器输出第一和第二控制信号。 正交变换电路对一个画面的图像数据进行正交变换,并生成变换输出。 量化电路在接收到第一控制信号时以预定的临时第一量化宽度量化变换输出,并产生第一量化输出,并且在接收到第二控制信号时以最佳第二量化宽度量化变换输出,并产生第二 量化输出。 熵编码电路对第一量化输出进行编码并产生第一编码输出,并对第二量化输出进行编码,并生成第二编码输出。 代码量计算器计算每个块的第一编码输出的代码量,并且基于每个块的代码量来计算一个屏幕的代码量。 分配数量的代码确定电路基于每个块的代码量和一个屏幕的代码量以及目标代码量确定分配给每个块的代码量。 量化宽度预测电路基于一个屏幕的代码量来预测第二量化宽度。 当第二编码输出的代码量超过分配的代码量时,编码停止电路向熵编码电路提供编码停止信号。