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71. 发明授权

US06276168B1 Purification of nitrogen trifluoride by continuous cryogenic distillation 有权
标题翻译：通过连续低温蒸馏纯化三氟化氮
公开(公告)号：US06276168B1
公开(公告)日：2001-08-21
申请号：US09566075
申请日：2000-05-08
申请人： Zbigniew Tadeusz Fidkowski , John Frederick Cirucci , Rakesh Agrawal , Shyam Ramchand Suchdeo , Steven Ray Auvil
发明人： Zbigniew Tadeusz Fidkowski , John Frederick Cirucci , Rakesh Agrawal , Shyam Ramchand Suchdeo , Steven Ray Auvil
IPC分类号： F25J100
CPC分类号： C01B21/0832 , B01D3/146 , Y10S62/918
摘要： The process recovers NF3 from a multicomponent fluid containing NF3, one or more components less volatile than NF3, and one or more components more volatile than NF3. The process uses a first distillation column and a second distillation column, each distillation column having a top and a bottom. The process includes the following steps: feeding the multicomponent fluid to the first distillation column at a first feed location below the top of the first distillation column; feeding a cryogenic liquid to the first or second distillation column adjacent the top of the first or second distillation column; withdrawing a mixture containing NF3 from the first distillation column; feeding the mixture to the second distillation column at a second feed location; separating NF3 from the mixture in the second distillation column; and removing a stream of NF3 from the second distillation column.
摘要翻译：该过程从含有NF3的多组分流体，一种或多种不如NF3的挥发性成分的一种或多种成分以及比NF3更易挥发的一种或多种成分回收NF3。该方法使用第一蒸馏塔和第二蒸馏塔，每个蒸馏塔具有顶部和底部。该方法包括以下步骤：在第一蒸馏塔顶部的第一进料位置将多组分流体进料至第一蒸馏塔; 将第一或第二蒸馏塔的低温液体与邻近第一或第二蒸馏塔的顶部相加; 从第一蒸馏塔中取出含有NF 3的混合物; 在第二进料位置将混合物进料到第二蒸馏塔; 从第二蒸馏塔中的混合物中分离出NF3; 并从第二蒸馏塔中除去NF 3流。

72. 发明授权

US06263700B1 Multieffect distillation for multicomponent separation 失效
标题翻译：多元蒸馏用于多组分分离
公开(公告)号：US06263700B1
公开(公告)日：2001-07-24
申请号：US09389267
申请日：1999-09-03
申请人： Rakesh Agrawal , Jianguo Xu
发明人： Rakesh Agrawal , Jianguo Xu
IPC分类号： F25J302
CPC分类号： B01D3/146 , F25J3/0219 , F25J3/0233 , F25J3/0257 , F25J3/0261 , F25J3/0295 , F25J3/04309 , F25J3/044 , F25J3/04412 , F25J3/04418 , F25J3/0443 , F25J3/04666 , F25J3/04709 , F25J3/04715 , F25J3/04793 , F25J2200/02 , F25J2200/04 , F25J2200/30 , F25J2200/34 , F25J2200/50 , F25J2200/52 , F25J2200/54 , F25J2200/90 , F25J2210/12 , F25J2235/02 , F25J2235/42 , F25J2245/02 , F25J2245/42 , F25J2290/40
摘要： An efficient multieffect distillation process separates multicomponent mixtures containing three or more components into product streams each enriched in one of the components. The distillation process consists of at least two distillation columns that are thermally linked. A mixture stream that can be the given feed or a stream recovered from another distillation column and containing three or more components is fed to one of the thermally linked distillation columns and at least two submixture streams are produced from this distillation column and transferred to other distillation columns for further distillation. At least one of the submixture streams is transferred to the other thermally linked distillation column. One submixture stream is lean in the least volatile component of the mixture feed and the other submixture stream is lean in the most volatile component of the mixture feed.
摘要翻译：有效的多效蒸馏方法将含有三种或更多种组分的多组分混合物分离成各自富含一种组分的产物流。蒸馏过程由至少两个热连接的蒸馏塔组成。将可以是给定进料或从另一个蒸馏塔回收并含有三种或更多种组分的混合物料流进料到一个热连接的蒸馏塔中，并从该蒸馏塔产生至少两种亚混合物流并转移至其它蒸馏塔用于进一步蒸馏。至少一个副混合流被转移到另一个热连接的蒸馏塔。一个混合物料流在混合物进料的最不易挥发的组分中是贫的，而另一个混合物流在混合物进料的最易挥发组分中是贫的。

73. 发明授权

US06240744B1 Process for distillation of multicomponent fluid and production of an argon-enriched stream from a cryogenic air separation process 有权
标题翻译：蒸馏多组分流体的方法和从低温空气分离过程产生富氩流
公开(公告)号：US06240744B1
公开(公告)日：2001-06-05
申请号：US09459561
申请日：1999-12-13
申请人： Rakesh Agrawal , Donn Michael Herron , Jung Soo Choe
发明人： Rakesh Agrawal , Donn Michael Herron , Jung Soo Choe
IPC分类号： F25J300
CPC分类号： F25J3/04703 , B01D3/14 , B01D3/141 , B01D3/146 , F25J3/04412 , F25J3/04666 , F25J3/04678 , F25J3/04733 , F25J3/04939 , F25J2205/60 , F25J2205/80 , F25J2205/82 , F25J2235/58 , F25J2245/58 , Y10S62/905 , Y10S62/924
摘要： A process separates a multicomponent feed by distillation into at least one stream enriched in the most volatile component, one stream enriched in the least volatile component, and one stream enriched in a component of intermediate volatility. In one embodiment, the process produces an argon-enriched stream from a cryogenic air separation process. The distillation system includes at least one distillation column that produces a nitrogen-enriched stream from the top of the column, an oxygen product stream from the bottom of the column, and an argon-enriched stream from a partitioned section. The geometry of the partitioned section minimizes vapor and liquid distribution, and includes a vertical separating element and an end separating element to isolate the partitioned section from the intermediate distillation section. The equivalent diameter (De) of the partitioned section is at least 60% of the ideal diameter (Di) of the partitioned section, wherein the equivalent diameter is defined as four times the cross sectional flow area enclosed by the vertical separating element divided by the perimeter formed by the vertical separating element, and the ideal diameter (Di) is the diameter of a circle which has the same cross sectional flow area as that cross sectional flow area which is enclosed by the vertical separating element.
摘要翻译：一种方法是通过蒸馏将多组分进料分离成富含最易挥发组分的至少一种物流，富含最不易挥发组分的一种物流和富含中等挥发性组分的一种物流。在一个实施方案中，该方法从低温空气分离过程产生富氩流。蒸馏系统包括至少一个蒸馏塔，其从塔的顶部产生富氮流，来自塔底的氧产物流和来自分隔区的富氩流。分隔部分的几何形状使蒸汽和液体分布最小化，并且包括垂直分离元件和端部分离元件以将分隔部分与中间蒸馏部分隔离。分隔部分的当量直径（De）为分隔部分的理想直径（Di）的至少60％，其中等效直径定义为垂直分离元件所包围的横截面流动面积的四倍由垂直分离元件形成的周边，理想直径（Di）是与由垂直分离元件包围的横截面积面积相同的横截面积面积的圆的直径。

74. 发明授权

US6138115A Method and system for generating a decision-tree classifier in parallel in a multi-processor system 有权
标题翻译：在多处理器系统中并行生成决策树分类器的方法和系统
公开(公告)号：US6138115A
公开(公告)日：2000-10-24
申请号：US245765
申请日：1999-02-05
申请人： Rakesh Agrawal , Manish Mehta , John Christopher Shafer
发明人： Rakesh Agrawal , Manish Mehta , John Christopher Shafer
IPC分类号： G06F17/30
CPC分类号： G06F17/30705 , G06F17/30625 , Y10S707/962 , Y10S707/966 , Y10S707/968 , Y10S707/99933 , Y10S707/99936 , Y10S707/99937 , Y10S707/99944
摘要： A method and system are disclosed for generating a decision-tree classifier in parallel in a multi-processor system, from a training set of records. The method comprises the steps of: partitioning the records among the processors, each processor generating an attribute list for each attribute, and the processors cooperatively generating a decision tree by repeatedly partitioning the records using the attribute lists. For each node, each processor determines its best split test and, along with other processors, selects the best overall split for the records at that node. Preferably, the gini-index and class histograms are used in determining the best splits. Also, each processor builds a hash table using the attribute list of the split attribute and shares it with other processors. The hash tables are used for splitting the remaining attribute lists. The created tree is then pruned based on the MDL principle, which encodes the tree and split tests in an MDL-based code, and determines whether to prune and how to prune each node based on the code length of the node.
摘要翻译：公开了一种用于在多处理器系统中从培训记录集并行生成决策树分类器的方法和系统。该方法包括以下步骤：在处理器之间划分记录，每个处理器为每个属性生成属性列表，并且处理器通过使用属性列表重复分割记录来协同地生成决策树。对于每个节点，每个处理器确定其最佳分割测试，并与其他处理器一起为该节点上的记录选择最佳的整体分割。优选地，使用基尼系数索引和类别直方图来确定最佳分割。此外，每个处理器使用split属性列表构建哈希表，并与其他处理器共享。散列表用于分割剩余的属性列表。然后，基于MDL原理修剪创建的树，MDL原理在基于MDL的代码中对树进行编码和分割测试，并根据节点的代码长度确定是否修剪和如何修剪每个节点。

75. 发明授权

US6119479A Dual mixed refrigerant cycle for gas liquefaction 有权
标题翻译：双重混合制冷剂循环用于气体液化
公开(公告)号：US6119479A
公开(公告)日：2000-09-19
申请号：US208562
申请日：1998-12-09
申请人： Mark Julian Roberts , Rakesh Agrawal
发明人： Mark Julian Roberts , Rakesh Agrawal
IPC分类号： F25J1/00 , F25B7/00 , F25J1/02 , F25J3/02 , F25J5/00
CPC分类号： F25J1/0022 , F25J1/0052 , F25J1/0055 , F25J1/0097 , F25J1/0214 , F25J1/0231 , F25J1/0267 , F25J1/0278 , F25J1/0291 , F25J1/0292 , F25J2220/62 , F25J2220/64 , F25J2245/02
摘要： Process and system for liquefying a pressurized gas, especially natural gas. The process is carried out in two heat exchangers, and cooling for each heat exchanger is provided by a mixed refrigerant which is vaporized at a single essentially constant pressure. Feed precooling, low level refrigerant precooling, and high level liquid refrigerant subcooling are effected in one of the heat exchanger against low level refrigerant vaporizing at a single essentially constant pressure. The process and system of the invention are especially well-suited for installation on ships, barges, and offshore platforms.
摘要翻译：用于液化加压气体，特别是天然气的方法和系统。该方法在两个热交换器中进行，每个热交换器的冷却由在单个基本恒定的压力下汽化的混合制冷剂提供。进料预冷却，低水平制冷剂预冷却和高液位制冷剂过冷却在一个热交换器中进行，以低压制冷剂在单个基本恒定的压力下蒸发。本发明的方法和系统特别适用于船舶，驳船和海上平台上的安装。

76. 发明授权

US6106674A Operable and efficient distillation schemes for multicomponent separations 失效
标题翻译：多组分分离的可操作和有效的蒸馏方案
公开(公告)号：US6106674A
公开(公告)日：2000-08-22
申请号：US84722
申请日：1998-05-26
申请人： Rakesh Agrawal , Zbigniew Tadeusz Fidkowski
发明人： Rakesh Agrawal , Zbigniew Tadeusz Fidkowski
IPC分类号： F25J3/00 , B01D3/14 , B01D3/42 , F25J3/02 , F25J3/04 , B01D3/32
CPC分类号： B01D3/146 , F25J3/0219 , F25J3/0233 , F25J3/0257 , F25J3/0261 , F25J3/0295 , F25J3/044 , F25J3/0466 , F25J3/04793 , F25J2200/02 , F25J2200/30 , F25J2200/38 , F25J2200/50 , F25J2200/72 , F25J2210/12 , F25J2290/40 , Y10S203/20
摘要： The present invention teaches an efficient and easier to operate distillation system to separate mixtures containing three or more components into streams enriched in one of the components. In this invention, a liquid stream enriched in the least volatile component is withdrawn from the bottom of one distillation column while a vapor stream enriched in the most volatile component is withdrawn from the top of another distillation column. Of these two distillation columns, the pressure of the distillation column with the bottom liquid enriched in the least volatile component is higher; and this higher pressure distillation column transfers at least two vapor streams from different locations to either one or more other distillation columns within the distillation system. For a ternary mixture, both the vapor streams are transferred to the distillation column with the top vapor enriched in the most volatile component. In the preferred mode, at least one of the vapor transfer is part of a two-way communication between the two columns, i.e., in addition to the transfer of the vapor stream, a return liquid stream is implemented between the same locations of the two columns. This invention allows the flow of all vapor streams from a higher pressure column to a lower pressure column and thereby does not suffer with the operating pressure constraints of the prior art efficient processes.
摘要翻译：本发明教导了一种有效且易于操作的蒸馏系统，以将含有三种或更多种组分的混合物分离成富含一种组分的物流。在本发明中，从一个蒸馏塔的底部排出富含最少挥发性组分的液体物流，同时富含最易挥发组分的蒸气流从另一个蒸馏塔的顶部排出。在这两个蒸馏塔中，富含最不易挥发组分的底部液体的蒸馏塔的压力较高; 并且该高压蒸馏塔将至少两个蒸汽流从不同位置转移到蒸馏系统内的一个或多个其它蒸馏塔。对于三元混合物，蒸气流被转移到蒸馏塔中，顶部蒸气富含最易挥发的组分。在优选的模式中，至少一个蒸汽传递是两列之间的双向连通的一部分，即，除了蒸汽流的转移之外，在两个相同的位置之间实现返回液体流列。本发明允许从更高压力塔到低压塔的所有蒸汽流的流动，从而不受现有技术有效过程的操作压力限制的影响。

77. 发明授权

US5970743A Production of argon from a cryogenic air separation process 失效
标题翻译：从低温空气分离过程生产氩气
公开(公告)号：US5970743A
公开(公告)日：1999-10-26
申请号：US96009
申请日：1998-06-10
申请人： Donn Michael Herron , Stephen John Cook , Rakesh Agrawal
发明人： Donn Michael Herron , Stephen John Cook , Rakesh Agrawal
IPC分类号： C01B23/00 , F25J3/04
CPC分类号： F25J3/04721 , F25J3/04412 , F25J3/04624 , F25J3/04678 , F25J3/04727 , F25J3/04872 , F25J2200/32 , F25J2200/34 , F25J2200/90 , F25J2205/02 , F25J2205/30 , F25J2245/58 , F25J2250/10 , Y10S62/924
摘要： The present invention relates to a process for the cryogenic separation of air to recover at least a nitrogen-depleted crude argon product, wherein the process is carried out in a primary distillation system comprising at least a first distillation column, which separates a feed mixture comprising nitrogen, oxygen and argon into a nitrogen-enriched overhead and an oxygen-rich bottoms, and a side-arm column which rectifies an argon-containing feed stream fed from the primary distillation column to produce an essentially-oxygen-depleted argon overhead. The improvement of the present invention is characterized in that: (a) a nitrogen-containing, argon-rich side stream is withdrawn from a location of the side-arm column which is above the location of entry of the argon-containing feed stream; (b) the withdrawn, nitrogen-containing, argon-rich side stream of step (a) is fed to a nitrogen rejection column to remove the contained nitrogen, wherein the nitrogen rejection column contains at least a stripping section which is located below the location of the feed of the nitrogen-lean, argon-rich side stream, and wherein the stripping section of the nitrogen rejection column is provided with vapor boilup; (c) the nitrogen-depleted, crude argon product is recovered and removed from the bottom of the nitrogen rejection column; and (d) at least a portion of upward flowing vapor in the nitrogen rejection column is removed and the removed portion is returned to a suitable location of the side-arm column.
摘要翻译：本发明涉及一种用于低温分离空气以回收至少一种贫氮粗氩产物的方法，其中该方法在包含至少第一蒸馏塔的一级蒸馏系统中进行，所述第一蒸馏塔分离包含氮气，氧气和氩气进入富氮塔顶和富氧底物，以及侧臂塔，其对从一级蒸馏塔进料的含氩进料流进行整流，以产生基本上不含氧的氩塔顶馏出物。本发明的改进的特征在于：（a）含氮富氩侧流从位于含氩进料流进入位置的侧臂塔的位置排出; （b）将步骤（a）的取出的含氮富氩侧流进料至氮排除塔以除去所含的氮，其中氮排除塔至少包含位于位置下方的汽提部分的贫氮富氩侧流的进料，并且其中氮排除塔的汽提段设置有蒸汽沸腾; （c）从氮排除塔的底部回收并除去贫氮粗氩产物; 和（d）氮排除塔中的向上流动的蒸气的至少一部分被去除，并且将去除的部分返回到侧臂塔的适当位置。

78. 发明授权

US5878413A System and method for defining shapes with which to mine time sequences in computerized databases 失效
公开(公告)号：US5878413A
公开(公告)日：1999-03-02
申请号：US947227
申请日：1997-10-08
申请人： Rakesh Agrawal , Giuseppe Psaila , Edward L. Wimmers , Mohamed Zait
发明人： Rakesh Agrawal , Giuseppe Psaila , Edward L. Wimmers , Mohamed Zait
IPC分类号： G06F17/30
CPC分类号： G06F17/30548 , G06F17/30327 , G06F17/30539 , Y10S707/99936 , Y10S707/99937
摘要： A system and method including a computer shape definition language are disclosed for defining shapes and mining time sequences that resemble the shapes. The system and method include provisions for establishing a user-defined alphabet that in turn establishes a set of elemental shapes. The system also includes simple yet powerful operators for combining the elemental shapes to define a desired time sequence shape. Moreover, intervals of actual time sequences are mapped into corresponding transition sequences using the alphabet, and the transition sequences are stored in a hierarchical index structure for easily accessing the transition sequences. The index structure is entered with the desired time sequence shape, and the index structure is traversed to identify maximal actual transition sequences which conform to the desired time sequence shape, within user-definable blurry criteria.

79. 发明授权

US5870735A Method and system for generating a decision-tree classifier in parallel in a multi-processor system 失效
公开(公告)号：US5870735A
公开(公告)日：1999-02-09
申请号：US641404
申请日：1996-05-01
申请人： Rakesh Agrawal , Manish Mehta , John Christopher Shafer
发明人： Rakesh Agrawal , Manish Mehta , John Christopher Shafer
IPC分类号： G06F17/30
CPC分类号： G06F17/30705 , G06F17/30625 , Y10S707/962 , Y10S707/966 , Y10S707/968 , Y10S707/99933 , Y10S707/99936 , Y10S707/99937 , Y10S707/99944
摘要： A method and system are disclosed for generating a decision-tree classifier in parallel in a multi-processor system, from a training set of records. The method comprises the steps of: partitioning the records among the processors, each processor generating an attribute list for each attribute, and the processors cooperatively generating a decision tree by repeatedly partitioning the records using the attribute lists. For each node, each processor determines its best split test and, along with other processors, selects the best overall split for the records at that node. Preferably, the gini-index and class histograms are used in determining the best splits. Also, each processor builds a hash table using the attribute list of the split attribute and shares it with other processors. The hash tables are used for splitting the remaining attribute lists. The created tree is then pruned based on the MDL principle, which encodes the tree and split tests in an MDL-based code, and determines whether to prune and how to prune each node based on the code length of the node.

80. 发明授权

US5842200A System and method for parallel mining of association rules in databases 失效
标题翻译：数据库中关联规则并行挖掘的系统和方法
公开(公告)号：US5842200A
公开(公告)日：1998-11-24
申请号：US500717
申请日：1995-07-11
申请人： Rakesh Agrawal , John Christopher Shafer
发明人： Rakesh Agrawal , John Christopher Shafer
IPC分类号： G06Q30/02 , G06F17/30
CPC分类号： G06Q30/02 , G06F2216/03 , Y10S707/99931 , Y10S707/99933
摘要： A multiprocessor including a plurality of processing systems is disclosed for discovering consumer purchasing tendencies. Each processing system of the multiprocessor identifies consumer transaction itemsets that are stored in a database that is distributed among the processing systems and which appear in the database a user-defined minimum number of times, referred to as minimum support. Then, the system discovers association rules in the itemsets by comparing the ratio of the number of times each of the large itemsets appears in the database to the number of times particular subsets of the itemset appear in the database. When the ratio exceeds a predetermined minimum confidence value, the system outputs an association rule which is representative of purchasing tendencies of consumers.
摘要翻译：公开了一种包括多个处理系统的多处理器，用于发现消费者购买倾向。多处理器的每个处理系统识别存储在数据库中的消费者事务项目集，该数据库分布在处理系统之间，并且在数据库中出现用户定义的最小次数，称为最小支持。然后，通过比较数据库中出现的每个大项目集的次数与数据库中出现的项目集的特定子集的次数之间的比例，系统发现项目集中的关联规则。当比率超过预定的最小置信度值时，系统输出代表消费者购买倾向的关联规则。

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