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31. 发明授权

US5819266A System and method for mining sequential patterns in a large database 失效
标题翻译：在大数据库中挖掘顺序模式的系统和方法
公开(公告)号：US5819266A
公开(公告)日：1998-10-06
申请号：US398640
申请日：1995-03-03
申请人： Rakesh Agrawal , Ramakrishnan Srikant
发明人： Rakesh Agrawal , Ramakrishnan Srikant
IPC分类号： G06F12/00 , G06F17/30 , G06F19/00 , G06Q30/02
CPC分类号： G06Q30/02 , Y10S707/99936
摘要： A system and method for mining databases includes a computer-implemented program which identifies patterns of transaction sequences that are stored in a database and which recur in the database with a user-defined regularity. The invention first identifies which sequences are large, i.e., which recur with the defined regularity, and then determines which sequences are maximal, i.e., which large sequences are not subsets of other large sequences. The set of maximal large sequences is returned to the user to indicate recurring purchasing patterns over time.
摘要翻译：用于挖掘数据库的系统和方法包括计算机实现的程序，其识别存储在数据库中的事务序列的模式，并且以用户定义的规则性在数据库中再现。本发明首先识别哪些序列是大的，即以定义的规则重复的序列，然后确定哪些序列是最大的，即哪个大序列不是其他大序列的子集。最大大序列的集合返回给用户以指示经常性购买模式随着时间的推移。

32. 发明授权

US5799311A Method and system for generating a decision-tree classifier independent of system memory size 失效
标题翻译：用于生成独立于系统内存大小的决策树分类器的方法和系统
公开(公告)号：US5799311A
公开(公告)日：1998-08-25
申请号：US646893
申请日：1996-05-08
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 , G06F2216/03 , Y10S707/99943
摘要： A method and system are disclosed for generating a decision-tree classifier from a training set of records, independent of the system memory size. The method comprises the steps of: generating an attribute list for each attribute of the records, sorting the attribute lists for numeric attributes, and generating a decision tree by repeatedly partitioning the records using the attribute lists. For each node, split points are evaluated to determine the best split test for partitioning the records at the node. Preferably, a gini index and class histograms are used in determining the best splits. The gini index indicates how well a split point separates the records while the class histograms reflect the class distribution of the records at the node. Also, a hash table is built as the attribute list of the split attribute is divided among the child nodes, which is then used for splitting the remaining attribute lists of the node. The created tree is further 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：公开了用于从记录的训练集合生成决策树分类器的方法和系统，与系统存储器大小无关。该方法包括以下步骤：为记录的每个属性生成属性列表，对数字属性的属性列表进行排序，以及通过使用属性列表重复分割记录来生成决策树。对于每个节点，分析点进行评估，以确定分区节点上的记录的最佳分割测试。优选地，使用基尼系数索引和类别直方图来确定最佳分割。 gini指数表示分割点将记录分离成多少，而类直方图反映了节点上记录的类分布。此外，由于分割属性的属性列表在子节点之间划分，因此构建了哈希表，然后用于分割节点的剩余属性列表。基于MDL原理进一步修剪创建的树，MDL原理对基于MDL的代码中的树和分割测试进行编码，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。

33. 发明授权

US5706674A Argon recovery from silicon crystal furnace 失效
标题翻译：硅晶体炉氩回收
公开(公告)号：US5706674A
公开(公告)日：1998-01-13
申请号：US785515
申请日：1997-01-17
申请人： Thomas Hsiao-Ling Hsiung , Zbigniew Tadeusz Fidkowski , Rakesh Agrawal
发明人： Thomas Hsiao-Ling Hsiung , Zbigniew Tadeusz Fidkowski , Rakesh Agrawal
IPC分类号： C01B23/00 , C30B15/00 , F25J3/02 , F25J1/00
CPC分类号： F25J3/08 , C01B23/0094 , C30B15/00 , C30B29/06 , F25J3/0285 , C01B2210/0004 , C01B2210/0006 , C01B2210/0014 , C01B2210/0045 , C01B2210/005 , F25J2200/04 , F25J2200/72 , F25J2215/58 , Y10S62/924
摘要： The present invention is directed to two embodiments of a process for recycling an impure argon effluent from a silicon crystal growing furnace using cryogenics. The first embodiment uses cryogenic distillation techniques, and the second embodiment uses cryogenic adsorption, both of which use catalytic treatments and adsorption in conjunction with their cryogenic process steps to provide a pure argon recycle stream for a silicon crystal growth furnace.
摘要翻译：本发明涉及使用低温法从硅晶体生长炉回收不纯的氩气流出物的方法的两个实施方案。第一实施例使用低温蒸馏技术，第二实施例使用低温吸附，两者都使用催化处理和吸附结合其低温工艺步骤为硅晶体生长炉提供纯氩循环流。

34. 发明授权

US5692395A Separation of fluid mixtures in multiple distillation columns 失效
标题翻译：在多个蒸馏塔中分离流体混合物
公开(公告)号：US5692395A
公开(公告)日：1997-12-02
申请号：US646652
申请日：1996-05-02
申请人： Rakesh Agrawal , Jianguo Xu
发明人： Rakesh Agrawal , Jianguo Xu
IPC分类号： F25J3/02 , B01D3/14 , B01D3/26 , F01K23/06 , F02C6/10 , F25J3/04
CPC分类号： B01D3/146 , F01K23/068 , F02C6/10 , F25J3/0209 , F25J3/0233 , F25J3/0257 , F25J3/04303 , F25J3/04448 , F25J3/04575 , F25J3/046 , F25J3/04606 , F25J3/04872 , F25J2200/04 , F25J2200/20 , F25J2200/50 , F25J2200/54 , F25J2235/02 , F25J2290/10 , F25J2290/40 , Y02E20/18 , Y10S62/927
摘要： A fluid mixture is separated by distillation in a two column system in which the feed is prefractionated in a first column having at least one separation stage above the feed and the prefractionator bottoms provides feed to a second column operating at a lower pressure. Cooling for condensing the overhead vapor of the first column is provided by indirect heat exchange with a flashed portion of the feed or with an intermediate fluid obtained from the second column. The two-column system is readily combined with a high pressure column in a three-column distillation system for separating air which is particularly useful for integration with a gasification combined cycle combustion turbine system. Optionally, three nitrogen products can be produced at three different pressures.
摘要翻译：流体混合物通过蒸馏在两塔系统中分离，其中进料在具有在进料上方的至少一个分离阶段的第一塔中进行初分馏，并且初步分馏塔底部提供进料到在较低压力下操作的第二塔。通过与进料的闪蒸部分或从第二塔获得的中间流体间接热交换来提供用于冷凝第一塔的塔顶蒸气的冷却。双塔系统容易地与用于分离空气的三塔蒸馏系统中的高压塔组合，这对于与气化联合循环燃烧涡轮机系统的整合特别有用。任选地，三种氮气产物可以在三种不同的压力下生产。

35. 发明授权

US5429666A VSA adsorption process with continuous operation 失效
标题翻译： VSA吸附过程连续运行
公开(公告)号：US5429666A
公开(公告)日：1995-07-04
申请号：US191401
申请日：1994-02-03
申请人： Rakesh Agrawal , Ravi Kumar , Tarik Naheiri , Charles F. Watson
发明人： Rakesh Agrawal , Ravi Kumar , Tarik Naheiri , Charles F. Watson
IPC分类号： B01D53/04 , B01D53/047 , C01B21/04 , B01D53/053
CPC分类号： B01D53/0476 , B01D2256/12 , B01D2257/102 , B01D2259/402 , B01D53/0446
摘要： A process for separating a feed gas mixture into a more strongly adsorbable component and a less strongly adsorbable component in a plurality of adsorbent beds containing an adsorbent selective for the more strongly adsorbable component using pressurization by product end to product end pressure equalization between beds simultaneous with cocurrent ambient and elevated pressure feed pressurization, coproduction of product and purge gas, and cocurrent depressurization for pressure equalization gas simultaneous with countercurrent evacuation. Oxygen product can be recovered from air at high recovery using the process.
摘要翻译：一种将进料气体混合物分离成多个吸附床中的较强吸附组分和较不强吸附组分的方法，所述多个吸附剂床含有选择性较强吸附组分的吸附剂，其通过产物端部至产物端部之间的压力平衡，同时与床并发环境和高压进料加压，产品和吹扫气体的共同生产，以及与逆流排空同时进行均压气体的并流减压。使用该方法可以以高回收率从空气中回收氧气产物。

36. 发明授权

US5425241A Process for the cryogenic distillation of an air feed to produce an ultra-high purity oxygen product 失效
标题翻译：用于空气进料的低温蒸馏以产生超高纯度氧产物的方法
公开(公告)号：US5425241A
公开(公告)日：1995-06-20
申请号：US241247
申请日：1994-05-10
申请人： Rakesh Agrawal , Donald W. Woodward
发明人： Rakesh Agrawal , Donald W. Woodward
IPC分类号： F25J3/04
CPC分类号： F25J3/04715 , F25J2200/06 , F25J2200/32 , F25J2200/34 , F25J2200/90 , F25J2215/56 , Y10S62/924
摘要： A process is set forth for the cryogenic distillation of an air feed to produce an ultra-high purity oxygen product. A first oxygen-containing but heavy contaminants-lean (free) stream is removed from the main distillation column system and subsequently stripped in an auxiliary distillation column. A second oxygen-containing but light contaminants-lean (free) gaseous stream is also removed from the main distillation column system and subsequently fed to the bottom section of the auxiliary distillation column in order to provide heat duty/reboil to the bottom of the auxiliary distillation column. The ultra-high purity oxygen product (ie total contaminant concentration less than 10.0 vppm, preferably less than 1.0 vppm) is withdrawn from an intermediate section of the auxiliary distillation column.
摘要翻译：阐述了用于空气进料的低温蒸馏以产生超高纯度氧产物的方法。从主蒸馏塔系统中除去第一含氧但重的污染物（游离）物流，随后在辅助蒸馏塔中汽提。还有从主蒸馏塔系统中除去第二个含氧但轻质污染物（自由）的气流，随后将其送入辅助蒸馏塔的底部，以便向辅助蒸馏塔的底部提供热负荷/再沸腾蒸馏塔。从辅助蒸馏塔的中间部分排出超高纯度氧产物（即总污染物浓度小于10.0vppm，优选小于1.0vppm）。

37. 发明授权

US5411578A Vacuum swing adsorption process with mixed repressurization and provide product depressurization 失效
标题翻译：真空摆动吸附过程与混合再加压并提供产品减压
公开(公告)号：US5411578A
公开(公告)日：1995-05-02
申请号：US241260
申请日：1994-05-10
申请人： Charles F. Watson , Roger D. Whitley , Rakesh Agrawal , Ravi Kumar
发明人： Charles F. Watson , Roger D. Whitley , Rakesh Agrawal , Ravi Kumar
IPC分类号： B01D53/047
CPC分类号： B01D53/0476 , B01D2256/12 , B01D2257/102 , B01D2259/40052 , B01D2259/40067 , B01D2259/40079 , B01D2259/40081 , B01D2259/403
摘要： A process for separating a feed gas mixture into a more strongly adsorbable component and a less strongly adsorbable component in a plurality of adsorbent beds containing an adsorbent selective for the more strongly adsorbable component with two cocurrent depressurizations, first to provide product and then to provide a purge gas, and using a combination of less strongly adsorbable component and feed gas mixture to repressurize the adsorbent bed. Oxygen product can be recovered from air at high recovery using the process.
摘要翻译：一种将进料气体混合物分离成多个吸附床中的较强吸附组分和较不强吸附组分的方法，所述多个吸附剂床含有选择性较强吸附组分的吸附剂，具有两种并流减压，首先提供产物，然后提供一种吹扫气体，并且使用较不强吸附的组分和进料气体混合物的组合来再加压吸附剂床。使用该方法可以以高回收率从空气中回收氧气产物。

38. 发明授权

US5275004A Consolidated heat exchanger air separation process 失效
标题翻译：整合换热器空气分离过程
公开(公告)号：US5275004A
公开(公告)日：1994-01-04
申请号：US918477
申请日：1992-07-21
申请人： Rakesh Agrawal , William T. Kleinberg
发明人： Rakesh Agrawal , William T. Kleinberg
IPC分类号： F25J3/04 , F25J3/02
CPC分类号： F25J3/04236 , F25J3/04284 , F25J3/04321 , F25J3/044 , F25J3/04412 , F25J3/04872 , F25J2200/72 , F25J2205/02 , Y10S62/903
摘要： The present invention relates to the heat exchanger system in a process for the cryogenic distillation of air. In particular, the present invention is an improvement to the heat exchanger system to increase the operational efficiency of the process.
摘要翻译：本发明涉及一种用于空气低温蒸馏的方法中的热交换器系统。特别地，本发明是对热交换器系统的改进，以提高该方法的操作效率。

39. 发明授权

US5257504A Multiple reboiler, double column, elevated pressure air separation cycles and their integration with gas turbines 失效
标题翻译：多重再沸器，双柱，高压空气分离循环及其与燃气轮机的集成
公开(公告)号：US5257504A
公开(公告)日：1993-11-02
申请号：US837786
申请日：1992-02-18
申请人： Rakesh Agrawal , Jianguo Xu
发明人： Rakesh Agrawal , Jianguo Xu
IPC分类号： F25J3/04 , F25J3/02
CPC分类号： F25J3/04618 , F25J3/04018 , F25J3/0406 , F25J3/0409 , F25J3/04127 , F25J3/04212 , F25J3/04303 , F25J3/04309 , F25J3/04315 , F25J3/04321 , F25J3/04351 , F25J3/04357 , F25J3/04393 , F25J3/04418 , F25J3/04575 , F25J3/046 , F25J2200/20 , F25J2200/54 , F25J2205/02 , F25J2250/20 , F25J2250/40 , F25J2250/50 , F25J2250/52 , Y10S62/915 , Y10S62/939
摘要： The present invention is a liquid nitrogen reflux means improvement capable of allowing the operation of conventional dual and triple reboiler air separation cycles at elevated pressures. The improvement comprises: (a) heat exchanging a portion of the liquid oxygen bottoms of the second column against a nitrogen vapor stream removed from the higher or lower pressure columns or derived from the gaseous nitrogen product, wherein prior to such heat exchange the pressure of the liquid oxygen bottoms portion or the nitrogen vapor stream or both the pressure of the liquid oxygen bottoms portion and the nitrogen vapor stream is adjusted by an effective amount so that an appropriate temperature difference exists between the liquid oxygen bottoms and the nitrogen vapor stream so that upon heat exchange the nitrogen vapor is totally condensed and the liquid oxygen bottoms portion is at least partially vaporized; (b) utilizing the condensed nitrogen as reflux in at least one of the two distillation columns; and (c) warming the vaporized oxygen to recover refrigeration.

40. 发明授权

US5255524A Dual heat pump cycles for increased argon recovery 失效
标题翻译：双热泵循环，提高氩气回收率
公开(公告)号：US5255524A
公开(公告)日：1993-10-26
申请号：US835640
申请日：1992-02-13
申请人： Rakesh Agrawal , Terrence F. Yee
发明人： Rakesh Agrawal , Terrence F. Yee
IPC分类号： F25J3/04
CPC分类号： F25J3/04103 , F25J3/04018 , F25J3/0409 , F25J3/04127 , F25J3/04206 , F25J3/04315 , F25J3/04339 , F25J3/04351 , F25J3/04369 , F25J3/04412 , F25J3/04545 , F25J3/04575 , F25J3/046 , F25J3/04618 , F25J3/04672 , F25J2200/20 , F25J2200/50 , F25J2200/54 , F25J2230/42 , F25J2240/70 , F25J2245/02 , F25J2250/20 , F25J2250/40 , F25J2250/50 , Y02B30/52 , Y10S62/924
摘要： The present invention relates to an improvement for the production of argon from cryogenic air separation processes. In particular, the improvement comprises using a first heat pump cycle to transfer refrigeration from the bottom of the low pressure column to the top of the crude argon column and a second heat pump cycle to transfer refrigeration from the bottom of the low pressure column to the top of the low pressure column.
摘要翻译：本发明涉及从低温空气分离方法生产氩气的改进。特别地，改进包括使用第一热泵循环将制冷从低压塔的底部转移到粗氩塔的顶部，以及第二热泵循环，以将制冷从低压塔的底部转移到顶部的低压塔。

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