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    • 3. 发明授权
    • Production of N-vinylformamide
    • 生产N-乙烯基甲酰胺
    • US5527963A
    • 1996-06-18
    • US346578
    • 1994-10-16
    • Shin-ichi SatoYasuharu MoriToshimitsu Inoue
    • Shin-ichi SatoYasuharu MoriToshimitsu Inoue
    • C07C231/12C07C233/09
    • C07C231/12
    • An improved process for producing N-vinylformamide including the steps of evaporating N-(.alpha.-substituted-ethyl)formamide or ethylidenebisformamide under reduced pressure and thermally decomposing the vapor at 150.degree.-600.degree. C., wherein the improvement comprises performing thermal decomposition by means of a pyrolysis reactor which is made up of two stages, the first being an unpacked tubular reactor constructed such that liquid flows down and the second being a packed tubular reactor, while keeping the vapor temperature at 200.degree.-400.degree. C. at the outlet of the unpacked tubular reactor and the inside temperature of the packed tubular reactor at 200.degree.-600.degree. C.
    • 一种改进的N-乙烯基甲酰胺的制备方法,包括以下步骤:在减压下蒸发N-(α-取代 - 乙基)甲酰胺或亚乙基双甲酰胺,并在150-600℃下热分解蒸气,其中改进包括进行热分解 由两级构成的热解反应器的装置,第一种是一个未包装的管式反应器,其构造为使得液体向下流动,而第二层是一个填充管式反应器,同时将蒸气温度保持在200-400℃ 未包装的管状反应器的出口和填充管式反应器的内部温度在200℃-600℃。
    • 4. 发明授权
    • Index managing method in database managing system
    • 数据库管理系统中的索引管理方法
    • US5806058A
    • 1998-09-08
    • US668684
    • 1996-06-24
    • Yasuharu MoriNobuo Kawamura
    • Yasuharu MoriNobuo Kawamura
    • G06F17/30G06F7/00
    • G06F17/30336Y10S707/99932
    • A database managing system for effecting management in accessing data stored in a database via an index is so configured so as to prevent duplication of index key values and increase of index key values from degrading the access performance and lowering the storage efficiency of the index. Upon receiving, from an application program, a request to add a data record, a database manager adds this data record to a data portion and effects addition and update of an index record in an index portion. An index manager intervenes in this processing and excepts, from the index portion, an index record containing an index key value which has reached an upper limit value of the number of duplications preset in an exception key managing table. At the time of recreation of the index, the index manager refers to access time contained in index records and excepts index records which have not been accessed during an elapse of a fixed period of time.
    • 通过索引对存储在数据库中的数据进行管理的数据库管理系统被配置为防止索引关键字的重复和索引关键字值的增加,从而降低访问性能并降低索引的存储效率。 在从应用程序接收到添加数据记录的请求时,数据库管理器将该数据记录添加到数据部分,并且对索引部分中的索引记录进行添加和更新。 索引管理器介入该处理,除了索引部分之外,还包括索引记录,该索引记录包含达到在异常密钥管理表中预设的重复次数的上限值的索引关键字值。 在索引重建时,索引管理器指的是索引记录中包含的访问时间,以及在固定时间段内没有被访问的索引记录。
    • 9. 发明授权
    • Lactam ring containing polymer
    • 内含聚合物的聚合物
    • US5512645A
    • 1996-04-30
    • US343640
    • 1994-11-22
    • Shigeru SawayamaYasuharu MoriYukino Nagai
    • Shigeru SawayamaYasuharu MoriYukino Nagai
    • C08F8/48C08F226/02C08F226/06C08F220/06C08F220/10C08F220/56C08F228/02
    • C08F226/02C08F8/48
    • There is provided a lactam ring-containing polymer comprising: 20 to 100 molar % of a structural unit represented by the general formula (1); 0 to 70 molar % of a structural unit represented by the general formula (2); and 0 to 70 molar % of a structural unit represented by the general formula (3) and/or a structural unit represented by the general formula (4): ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 each represents a hydrogen atom or a methyl group, and X represents COOR.sup.4 and/or CONR.sup.5 R.sup.6 in which R.sup.4, R.sup.5 and R.sup.6 each represents a hydrogen atom or a C1-C4 alkyl.The polymer is excellent in heat resistance and is expected to be used for resin modifiers, polymeric additives for petroleum tertiary recovery, and other various applications.
    • 提供含有内酰胺环的聚合物,其包含:20-100摩尔%的由通式(1)表示的结构单元; 0〜70摩尔%的由通式(2)表示的结构单元; (3)表示的结构单元和/或由通式(4)表示的结构单元为0〜70摩尔%。< IMAGE>(2)< IMAGE> (4)其中R1,R2和R3各自表示氢原子或甲基,X表示COOR4和/或CONR5R6,其中R4,R5和R6各自表示氢原子或C1-C4烷基。 聚合物的耐热性优异,并且预期用于树脂改性剂,用于石油三级回收的聚合物添加剂和其它各种应用。