Jack Lindsay

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Recently, researchers started to engineer not only the outer shape of objects, but also their <i>internal microstructure</i>. Such objects, typically based on 3D cell grids, are also known as metamaterials. Metamaterials have been used, for example, to create materials with soft and hard regions. So far, metamaterials were understood as materials-we want(More)
Vibration motors are often used to generate tactile effects by exciting a mass at a given frequency and amplitude. The characteristic impedance of this vibrotactile device is not always in harmony with the impedance of the human skin. This impedance mismatch can result in poor energy transfer, necessitating larger motors and greater power consumption than(More)
Vibration motors are often used to generate tactile feedback to enhance human-machine interactions and provide information about the environment. We are interested in using these motors to enhance user feedback when wearing below-knee prostheses by providing informational cues via vibrations on the thigh. Our initial designs to hold the motors against the(More)
Diamond tilms were deposited with an r.f. plasma operating at atmospheric pressure. The gas composition above the growth surface was measured with a gas ch~-omatograph. Experiments were conducted over a range of methane flow rates and sut'strate t,,'r~peratt~res. Films were characterized by SEM and X-ray diffraction texture analysis. Increases in either(More)
Vibrotactile devices suffer from poor energy efficiency, arising from a mismatch between the device and the impedance of the human skin. This results in over-sized actuators and excessive power consumption, and prevents development of more sophisticated, miniaturized and low-power mobile tactile devices. In this paper, we present the experimental evaluation(More)
The roentgenologic and clinical findings are reviewed in 11 patients with gastric leiomyosarcoma. The tumors were predominantly exogastric lesions in the proximal one-half of the stomach, producing extrinsic pressure on the stomach and smooth stretching of overlying gastric mucosa. Ulceration or cavitation in the tumor was present in 5 instances, with(More)
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