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    • 7. 发明申请
    • Rheometer for rapidly measuring small quantity samples
    • 用于快速测量小批量样品的流变仪
    • US20050166667A1
    • 2005-08-04
    • US11090755
    • 2005-03-25
    • Damian HajdukEric CarlsonRavi Srinivasan
    • Damian HajdukEric CarlsonRavi Srinivasan
    • G01N19/00G01L1/16G01L1/24G01N3/02G01N3/24G01N11/14G01N11/16
    • G01N3/24G01N11/16G01N2203/0051G01N2203/0286G01N2203/0623
    • The present invention relates to a miniature rheometer, a parallel rheometer, and improved force sensor elements which may advantageously be used in combination with the miniature rheometer and the parallel rheometer. The miniature rheometer is adapted to determine rheological characteristics of materials which are provided in the form of small quantity samples. The miniature rheometer comprises an actuating element, a sensing element and a feedback circuit to provide rebalance of the shear force applied by the sample to the sensing element, which insures an exceptional stiffness in determining the shear strain so as to allow measurements of high accuracy. The parallel rheometer of the present invention allows simultaneous measurements of a plurality of samples so as to allow of a plurality of samples within a short time period. The force sensor element according to the present invention allows simultaneous measurement of a shear force and a normal force applied to the sensor element. Moreover, a rheometer is provided which comprises a force sensor based on stress-optic material.
    • 本发明涉及微型流变仪,平行流变仪和改进的力传感器元件,其可有利地与微型流变仪和平行流变仪组合使用。 微型流变仪适用于确定以少量样品形式提供的材料的流变特性。 微型流变仪包括致动元件,感测元件和反馈电路,以提供由样品施加到感测元件的剪切力的重新平衡,这确保了确定剪切应变的特殊刚度,以便允许高精度的测量。 本发明的并行流变仪允许多个样本的同时测量,以便在短时间内允许多个样本。 根据本发明的力传感器元件允许同时测量施加到传感器元件的剪切力和法向力。 此外,提供了一种流变仪,其包括基于应力光学材料的力传感器。
    • 8. 发明授权
    • Detection of memory-related errors in computer programs
    • 检测计算机程序中的内存相关错误
    • US06823507B1
    • 2004-11-23
    • US09587924
    • 2000-06-06
    • Ravi SrinivasanUsha KiranNavin Kumar Sinha
    • Ravi SrinivasanUsha KiranNavin Kumar Sinha
    • G06F945
    • G06F11/3604G06F8/443
    • A method, an apparatus, and a computer program product are disclosed for detecting memory-related errors in a computer program during compiling of the computer program. In the method, static analysis is performed upon a computer program. One or more conditions in the computer program are computed based on the static analysis. Each condition is a test for checking a memory access in the computer program and can be either a pre- or post-condition. The validity of each condition in the computer program is then evaluated. If the evaluation is determinate during compiling, the presence or absence of memory-related errors in the computer program is reported. A condition is determinate if the condition is valid or invalid during compiling. Otherwise, computer code based on the condition is generated for incorporation in the computer program for run-time detection of memory-related errors.
    • 公开了一种方法,装置和计算机程序产品,用于在计算机程序的编译期间检测计算机程序中的存储器相关错误。 在该方法中,在计算机程序上执行静态分析。 基于静态分析计算计算机程序中的一个或多个条件。 每个条件都是用于检查计算机程序中的存储器访问的测试,可以是前一个或后一个条件。 然后评估计算机程序中每个条件的有效性。 如果评估在编译期间是确定的,则报告计算机程序中是否存在与内存有关的错误。 条件在编译期间是否有效或无效。 否则,生成基于条件的计算机代码,用于并入计算机程序中用于运行时检测与存储器相关的错误。
    • 10. 发明授权
    • Less-claustrophobic, quadrature, radio-frequency head coil for nuclear
magnetic resonance
    • 用于核磁共振的不幽闭,正交,射频头线圈
    • US06029082A
    • 2000-02-22
    • US976857
    • 1997-11-24
    • Ravi SrinivasanHaiying LiuRobert A. Elek
    • Ravi SrinivasanHaiying LiuRobert A. Elek
    • G01R33/34A61B5/055
    • G01R33/34046G01R33/34084
    • A less-claustrophobic, quadrature, radio-frequency head coil (42) includes first and second broken end rings (90, 92) connected to each other in parallel by a plurality of leg conductors (94). At least two of the leg conductors are interconnected by a third arcuate conductor segment (98) axially displaced from planes of the first and second end rings to provide an opening (44) over a subject's face. The opening reduces patient claustrophobia and permits access to the patient for life-support devices or the practice of interventional medicine. The end rings have a fixed capacitance (C.sub.1, C.sub.2) between each pair of leg conductors. The fixed capacitance C.sub.1 between at least one pair of leg conductors and the fixed capacitance C.sub.2 between at least the pair of leg conductors adjacent the opening, where C.sub.2 >C.sub.1. A two-port feed (66, 68) circumferentially attached to the coil generally opposite the opening matches the individual linear modes. Thus, the radio frequency coil is able to maintain two preferred principal linear modes (A, B) across the open area of the coil.
    • 较不幽闭的正交射频头线圈(42)包括通过多个腿导体(94)并联连接的第一和第二断开端环(90,92)。 至少两个腿导体通过从第一和第二端环的平面轴向移位的第三弓形导体段(98)互连,以在对象的表面上提供开口(44)。 开幕式可减少患者幽闭恐惧症,并允许进入患者的生命支持设备或介入医学的实践。 端环在每对腿导体之间具有固定电容(C1,C2)。 在至少一对腿导体之间的固定电容C1和固定电容C2之间至少一对腿导体相邻开口,其中C2> C1。 周向地连接到与开口相对的线圈的两端口馈送(66,68)与各个线性模式匹配。 因此,射频线圈能够在线圈的开放区域上保持两个优选的主线性模式(A,B)。