公开(公告)号：WO1996025369A1

公开(公告)日：1996-08-22

申请号：PCT/US1996001928

申请日：1996-02-14

Applicant: DREXEL UNIVERSITY ,  BY-PRODUCTS DEVELOPMENT CO.

Inventor： DREXEL UNIVERSITY ,  BY-PRODUCTS DEVELOPMENT CO. ,  SILVERSTRIM, Thomas ,  ROSTAMI, Hossein ,  LARRALDE, Jesus ,  SAMADI, Anamolah

IPC: C04B07/00

CPC classification number: C04B12/04 ,  C04B28/26 ,  Y02W30/92 ,  Y10S106/01 ,  C04B7/02 ,  C04B18/08 ,  C04B20/0048 ,  C04B40/0263

Abstract: Rapid curing, high strength cementitious binder mixtures are provided containing fly ash and an alkali silicate binder that has a weight ratio of SiO2:M2O of about 0.20:1 to about 0.75:1 wherein M is selected from the group consisting of Li, Na, K, Ca and Mg. The cementitious binder mixtures can be mixed with aggregates to provide mortar and concrete mixtures. Any of the binder, mortar and concrete mixtures can be cured under elevated temperatures to yield high strenght products.

Abstract translation: 提供快速固化，高强度水泥粘合剂混合物，其含有粉煤灰和碱性硅酸盐粘合剂，其重量比为约0.20:1至约0.75:1，其中M选自Li，Na， K，Ca和Mg。 水泥粘合剂混合物可与聚集体混合以提供砂浆和混凝土混合物。 任何粘合剂，砂浆和混凝土混合物都可以在高温下固化，以产生高强度的产品。

公开(公告)号：WO1994026037A1

公开(公告)日：1994-11-10

申请号：PCT/US1994004590

申请日：1994-04-25

Applicant: DREXEL UNIVERSITY

Inventor： DREXEL UNIVERSITY ,  ZHOU, Xue-Song ,  DARYOUSH, Afshin

IPC: H04B01/28

CPC classification number: H04B1/28 ,  H03B5/00 ,  H03D7/125 ,  H03D9/0675 ,  H03D2200/0027 ,  H03D2200/0088

Abstract: Self-oscillating mixer circuits (10) are used in communications systems. The circuits comprise a push-pull amplifier (40) for amplifying a signal having a first frequency to produce an amplified signal, a feedback loop coupled to the push-pull amplifier (40) for phase shifting the amplified signal during each half cycle of the push-pull amplifier, thereby creating an oscillating output signal, and a mixing element (70) for coupling the oscillating signal to the signal having the first frequency, thereby mixing the signal having the first frequency with the oscillating signal to produce a signal having a second frequency. The circuits described herein have transistors (80, 90, 120, 130) that operate near the class B mode to obtain optimal frequency conversion with minimal power consumption. These circuits will therefore find use in any communications-type system which requires a frequency converter.

Abstract translation: 自振荡混频器电路（10）用于通信系统。 电路包括用于放大具有第一频率以产生放大信号的信号的推挽放大器（40），耦合到推挽放大器（40）的反馈环路，用于在放大信号的每个半周期期间使放大信号相移 推挽放大器，从而产生振荡输出信号;以及混合元件（70），用于将振荡信号耦合到具有第一频率的信号，由此将具有第一频率的信号与振荡信号混合以产生具有 第二频率。 本文描述的电路具有在B类模式附近工作的晶体管（80,90,120,130），以最小功耗获得最佳频率转换。 因此，这些电路将用于需要变频器的任何通信型系统中。

公开(公告)号：WO1998022244A1

公开(公告)日：1998-05-28

申请号：PCT/US1997020272

申请日：1997-11-11

Applicant: DREXEL UNIVERSITY

Inventor： DREXEL UNIVERSITY ,  BARSOUM, Michel, W. ,  EL-RAGHY, Tamer

IPC: B22F03/12

CPC classification number: C04B35/5615 ,  C04B35/56 ,  C04B35/5611 ,  C04B35/5618 ,  C04B35/645 ,  C04B35/6455

Abstract: A dense ceramic workpiece is made by a process of combining a powdered (312) component, e.g., Ti3SiC2, with a powdered component that is soluble in the (312) component, e.g., TiSi2 in Ti3SiC2, forming the mixture into a green body, heating the green body under pressureless sintering conditions to a temperature above a point at which a liquid is formed but below the melting point of the (312) compound to yield a dense ceramic workpiece, and thereafter cooling the dense (312) ceramic workpiece.

Abstract translation: 通过将粉末状（312）成分（例如Ti 3 SiC 2）与可溶于（312）成分的粉末成分（例如Ti 3 SiC 2中的TiSi 2）组合成生坯体的方法制成致密的陶瓷工件， 在无压烧结条件下将生坯体加热至高于（312）化合物熔点但低于（312）化合物熔点的温度，然后冷却致密（312）陶瓷工件。

公开(公告)号：WO1994011118A1

公开(公告)日：1994-05-26

申请号：PCT/US1993010695

申请日：1993-11-08

Applicant: DREXEL UNIVERSITY ,  OPHTHALMIC RESEARCH CORPORATION

Inventor： DREXEL UNIVERSITY ,  OPHTHALMIC RESEARCH CORPORATION ,  KAMEL, Ihab ,  SOLL, David, B.

IPC: B05D01/02

CPC classification number: A61L27/14 ,  A61F2/16 ,  A61F2002/009 ,  A61L27/16 ,  A61L27/34 ,  A61L33/0088 ,  A61L33/08 ,  B05D1/62 ,  B05D3/144 ,  B29C59/14 ,  B29K2995/0056 ,  C08J7/18 ,  C23C8/36 ,  C08L51/00 ,  C08L5/00

Abstract: The surface of a substrate material may be permanently modified so as to develop a microscopically smooth, biocompatible surface thereon. A biocompatible polymeric material may be covalently grafted to the surface of the substrate material by radio frequency plasma-induced grafting. The biocompatible polymeric material is preferably the same as the substrate material but may be different. Before grafting, a portion of the substrate surface may be first removed, as by etching, in a radio frequency plasma reactor using inert argon gas. Alternatively, the surface of the substrate material may be subjected to radio frequency plasma sufficient to raise the temperature at the substrate surface to just above the glass transition temperature (Tg) of the substrate material for a time sufficient to produce a microscopically smooth, biocompatible surface on the substrate material. The methods may be used to produce a prosthesis used in mammals, including an intraocular lens, having a polymeric material core and a biocompatible polymeric material covalently grafted to the polymer core by radio frequency plasma treatment.

Abstract translation: 衬底材料的表面可以被永久地改性，以在其上显影微观平滑的生物相容性表面。 生物相容性聚合物材料可以通过射频等离子体诱导接枝共价接枝到衬底材料的表面上。 生物相容性聚合物材料优选与基底材料相同，但是可以不同。 在接枝之前，可以首先通过蚀刻在使用惰性氩气的射频等离子体反应器中去除衬底表面的一部分。 或者，衬底材料的表面可以经受足够的射频等离子体，以将衬底表面的温度升高到高于衬底材料的玻璃化转变温度（Tg）的时间足以产生微观平滑的生物相容性表面 在基材上。 该方法可用于生产用于哺乳动物的假体，包括眼内透镜，其具有通过射频等离子体处理共价接枝到聚合物芯上的聚合材料芯和生物相容性聚合材料。

公开(公告)号：WO1991019021A1

公开(公告)日：1991-12-12

申请号：PCT/US1991003709

申请日：1991-05-28

Applicant: DREXEL UNIVERSITY

Inventor： DREXEL UNIVERSITY ,  WEI, Yen ,  JANG, Guang-Way ,  CHAN, Chi-Cheung

IPC: C25B03/02

CPC classification number: C08G61/126 ,  H01B1/127

Abstract: Electrically conductive polythiophene and its derivatives are prepared by polymerizing compounds of formula (I), wherein R?1 and R2¿ are independently hydrogen, R?3, -OR3 or -SR3; and R3¿ is aryl of 6 to 12 carbons or aliphatic of 1 to 12 carbons; comprising reacting the compound of formula (I) in the presence of an initiator, the initiator comprising a 2-substituted thiophene nucleus which has a lower oxidation potential than the compound of formula (I) and which is capable of being incorporated into the polymer resulting from the polymerization reaction; a chemical oxidant or an applied electrochemical potential; and a non-aqueous organic solvent.

公开(公告)号：WO1994009703A1

公开(公告)日：1994-05-11

申请号：PCT/US1993010562

申请日：1993-11-01

Applicant: DREXEL UNIVERSITY

Inventor： DREXEL UNIVERSITY ,  WHEATLEY, Margaret, A. ,  SHEN, Peng ,  SINGHAL, Shruti ,  GOLDBERG, Barry, B.

IPC: A61B08/00

CPC classification number: A61K49/223

Abstract: The present invention is a mixture including a solvent, a first surfactant and a second, dispersible surfactant different from the first surfactant, the mixture having stabilized gas microbubbles formed therein by sonication. The gas microbubbles are useful in ultrasonic diagnostics. Preferably the first surfactant is substantially soluble in the solvent and the second surfactant is substantially insoluble in the solvent. The present invention also includes a process for preparing the stabilized gas microbubbles and a method for altering the contrast of an ultrasonic image using the microbubbles as a contrast agent.

Abstract translation: 本发明是包含溶剂，第一表面活性剂和不同于第一表面活性剂的第二可分散表面活性剂的混合物，所述混合物通过超声处理在其中形成稳定的气体微泡。 气体微泡可用于超声诊断。 优选地，第一表面活性剂基本上可溶于溶剂，第二表面活性剂基本上不溶于溶剂。 本发明还包括一种制备稳定气体微泡的方法和一种使用微泡作为造影剂改变超声波图像的对比度的方法。

公开(公告)号：WO1992013007A1

公开(公告)日：1992-08-06

申请号：PCT/US1992000445

申请日：1992-01-17

Applicant: DREXEL UNIVERSITY

Inventor： DREXEL UNIVERSITY ,  WEI, Yen ,  YANG, Dachuan ,  TIAN, Jing

IPC: C08F02/00

CPC classification number: C08F34/00

Abstract: Electrically conductive polypyrrole and its derivatives are prepared by polymerizing compounds of formula (I), wherein R?1, R2 and R3¿ are independently hydrogen, halogen, R?4, -OR4 or -SR4; and R4¿ is aryl of 4 to 12 carbons or aliphatic of 1 to 20 carbons; comprising reacting the compound of formula (I) in the presence of an initiator, the initiator comprising a 2-substituted pyrrole nucleus which has a lower oxidation potential than the compound of formula (I) and which is capable of being incorporated into the polymer resulting from the polymerization reaction; a chemical oxidant or an applied electrochemical potential; and a solvent.

公开(公告)号：WO1992001232A1

公开(公告)日：1992-01-23

申请号：PCT/US1991004693

申请日：1991-07-02

Applicant: DREXEL UNIVERSITY

Inventor： DREXEL UNIVERSITY ,  BEARD, Richard, B. ,  SCHMUKLER, Robert ,  SCHWAN, Herman, P. ,  PROUT, Frederick

IPC: G01R27/02

CPC classification number: G01M3/40 ,  A61B42/30 ,  A61F6/04

Abstract: A method and apparatus for the non-destructive testing of a protective barrier material (28) is provided. In a preferred embodiment, the method comprises applying an alternating electrical current across the protective barrier material (28) for establishing a conductivity, G, of the protective barrier material (28) and/or a quality factor, Q, of the protective barrier material (28). The conductivity, G, and/or the quality factor, Q, are measured at more than one frequency. The quality factor and/or conductivity measurements so obtained at the more than one frequency are compared to predetermined quality factor and/or conductivity limits.

公开(公告)号：WO1997027965A1

公开(公告)日：1997-08-07

申请号：PCT/US1997000444

申请日：1997-01-14

Applicant: DREXEL UNIVERSITY

Inventor： DREXEL UNIVERSITY ,  BARSOUM, Michel, W. ,  BRODKIN, Dmitri ,  EL-RAGHY, Tamer ,  YAROSCHUK, Gregg, S.

IPC: B22F03/12

CPC classification number: C04B35/5607 ,  C04B35/5611 ,  C04B35/5618 ,  C04B35/5622 ,  C04B35/58014 ,  C04B35/645 ,  C04B35/6455 ,  C22C1/058

Abstract: Products having single phases or solid solutions of the formula M2R1X1 wherein M is transition metal, R is one or more of Si, Al, Ge, Pb, Sn, Ga, P, S, In, As, Tl or Cd, and X is one or more of B, C or N can be prepared by subjecting a powdered mixture containing M, R and X to a temperature of about 1000 DEG C to about 1800 DEG C, preferably under a pressure of about 5 MPa to about 200 MPa. The products so formed have excellent machinability. The products may also be present as composites, preferably composites which are in thermal equilibrium with the single phase or solid solutions of the formula M2R1X1.

Abstract translation: 具有式M2R1X1的单相或固溶体的产物，其中M是过渡金属，R是Si，Al，Ge，Pb，Sn，Ga，P，S，In，As，Tl或Cd中的一种或多种，​​X是 B，C或N中的一种或多种可以通过使含有M，R和X的粉末混合物在约1000℃至约1800℃的温度下，优选在约5MPa至约200MPa的压力下进行制备。 如此形成的产品具有优异的机械加工性。 该产品也可以作为复合材料存在，优选与式M2R1X1的单相或固溶体处于热平衡的复合材料。

公开(公告)号：WO1997018162A1

公开(公告)日：1997-05-22

申请号：PCT/US1996018154

申请日：1996-11-13

Applicant: DREXEL UNIVERSITY ,  BARSOUM, Michel ,  EL-RAGHY, Tamer ,  BRODKIN, Dmitri ,  ZAVALIANGOS, Antonios ,  KALIDINDI, Surya

Inventor： DREXEL UNIVERSITY

IPC: C01B35/04

CPC classification number: C04B35/645 ,  C01B35/04 ,  C04B35/5611 ,  C04B35/5615 ,  C04B35/58014 ,  C04B35/58071 ,  C04B35/6455

Abstract: Products having single phases or solid solutions of the formula M3X1Z2 wherein M is a transition metal, X is Si, Al or Ge and Z is B, C or N can be prepared by taking a powdered mixture containing M, X and Z to a temperature of about 1000 DEG C to about 1800 DEG C, optionally simultaneously under a pressure of about 5 MPa to about 200 MPa. The products so formed have excellent shock resistance, oxidation resistance and machinability. The products may also be present as composites, preferably composites which are in thermal equilibrium with the single phase or solid solutions of the formula M3X1Z2.

Abstract translation: 具有式M3X1Z2的单相或固溶体的产物，其中M是过渡金属，X是Si，Al或Ge，Z是B，C或N可以通过将含有M，X和Z的粉末混合物加入到温度 约1000℃至约1800℃，任选在约5MPa至约200MPa的压力下同时进行。 所形成的产品具有优异的抗冲击性，抗氧化性和可加工性。 该产品也可以作为复合材料存在，优选与式M3X1Z2的单相或固溶体处于热平衡的复合材料。