Abstract: An ultrasonic welding device including a sonotrode having a central weld region adjacent to an anvil, a first converter providing mechanical vibrations to a proximal end of the sonotrode, a second converter providing mechanical vibrations to a distal end of the sonotrode in a direction opposite to the first converter, a power supply delivering electrical energy to each of the first and second converters, and the mechanical vibrations received by the sonotrode from the first converter being in phase with the mechanical vibrations received from the second converter.

Abstract: A method for testing the integrity of a stack during ultrasonic welding, includes the steps of: (i) ultrasonically welding two or more work pieces with a stack, the stack including a convertor and a horn; (ii) measuring a frequency profile based on a vibration of the horn during the welding step; and (iii) comparing the measured frequency profile to a standard frequency profile to obtain an error rate, the error rate being indicative of a difference between the measured frequency profile and the standard frequency profile. A system employing the aforementioned method is also provided.

Abstract: An ultrasonic welding device including a sonotrode having a central weld region adjacent to an anvil, a first converter providing mechanical vibrations to a proximal end of the sonotrode, a second converter providing mechanical vibrations to a distal end of the sonotrode in a direction opposite to the first converter, a power supply delivering electrical energy to each of the first and second converters, and the mechanical vibrations received by the sonotrode from the first converter being in phase with the mechanical vibrations received from the second converter.

Abstract: A method for testing the integrity of a stack during ultrasonic welding, includes the steps of: (i) ultrasonically welding two or more work pieces with a stack, the stack including a convertor and a horn; (ii) measuring a frequency profile based on a vibration of the horn during the welding step; and (iii) comparing the measured frequency profile to a standard frequency profile to obtain an error rate, the error rate being indicative of a difference between the measured frequency profile and the standard frequency profile. A system employing the aforementioned method is also provided.

Abstract: Methods and systems are provided for a universal key that enables a user to have access to any type of secured portal, both physical and electronic, in a wireless, hands-free, distance-independent manner without requiring contact or line of sight access between the key and the secured portal. The universal key is not distance-dependent, and each secured portal can be provided with its own prescribed activation range, if desired. Some portals may be provided with long range activation, such as 50 feet, while other portals may be provided with short range activation of a few feet or less. The type of portal being secured and the range of activation may be selected by the user and is not limited by the universal key. In addition, the universal key will provide access to the secured portals in a hands-free fashion so that the user need not push any buttons or take any other action in order to obtain access to the portal.

Abstract: Methods and systems are provided for a universal key that enables a user to have access to any type of secured portal, both physical and electronic, in a wireless, hands-free, distance-independent manner without requiring contact or line of sight access between the key and the secured portal. The universal key is not distance-dependent, and each secured portal can be provided with its own prescribed activation range, if desired. Some portals may be provided with long range activation, such as 50 feet, while other portals may be provided with short range activation of a few feet or less. The type of portal being secured and the range of activation may be selected by the user and is not limited by the universal key. In addition, the universal key will provide access to the secured portals in a hands-free fashion so that the user need not push any buttons or take any other action in order to obtain access to the portal.

Abstract: A flow cell for the ultrasonic treatment of a liquid includes a housing with a wall at least partially defining a flow chamber therein. The housing includes a first liquid passage and a second liquid passage for flowing the liquid into and out of the flow chamber. An ultrasonic horn extends into the flow chamber for imparting ultrasonic energy to liquid in the flow chamber, the ultrasonic horn having an outer surface and an end surface, and having a recess formed in the end surface. A tubular member having a first end in fluid communication with a second end, is arranged such that the first end is in fluid communication with the second liquid passage, and the second end extends into the recess in the ultrasonic horn.

Abstract: Methods and systems are provided for a universal key that enables a user to have access to any type of secured portal, both physical and electronic, in a wireless, hands-free, distance-independent manner without requiring contact or line of sight access between the key and the secured portal. The universal key is not distance-dependent, and each secured portal can be provided with its own prescribed activation range, if desired. Some portals may be provided with long range activation, such as 50 feet, while other portals may be provided with short range activation of a few feet or less. The type of portal being secured and the range of activation may be selected by the user and is not limited by the universal key. In addition, the universal key will provide access to the secured portals in a hands-free fashion so that the user need not push any buttons or take any other action in order to obtain access to the portal.

Abstract: A semiconductor device is disclosed in which a barrier layer is deposited on the sides of the mesa. The barrier layer may comprise a semiconductor material. The barrier layer reduces diffusion of dopants into the active region of the device.

Abstract: The present invention provides an integrated optical device comprising two optical devices. One of the optical devices that comprise the integrated optical device may have undergone quantum well intermixing to provide a shift in the absorption edge of that device. The absorption edge may be shifted to a longer wavelength. In one embodiment the integrated optical device comprises a laser and a electro absorption modulator and in a further embodiment the integrated optical device comprises a laser and a detector.

Abstract: A flow cell for the ultrasonic treatment of a liquid includes a housing with a wall at least partially defining a flow chamber therein. The housing includes a first liquid passage and a second liquid passage for flowing the liquid into and out of the flow chamber. An ultrasonic horn extends into the flow chamber for imparting ultrasonic energy to liquid in the flow chamber, the ultrasonic horn having an outer surface and an end surface, and having a recess formed in the end surface. A tubular member having a first end in fluid communication with a second end, is arranged such that the first end is in fluid communication with the second liquid passage, and the second end extends into the recess in the ultrasonic horn.

Abstract: A semiconductor structure comprising a p-i-n double heterostructure in which a high solubility layer is provided that reduces the diffusion of p-type dopants from a cladding layer into the active region. The high solubility layer is preferably formed between the p-type doped cladding layer and the active region.

Abstract: A control for an ultrasonic surgical instrument is described wherein a transducer having an elongate tip is vibrated to perform surgery. The amplitude of the vibrations by the tip are controlled and the power delivered to the tip can be set so that the operator of the instrument can in effect render the instrument sensitive to different tissues to avoid damage thereto and enhance the safety of the patient.

Abstract: One digitizer grid pattern is used for each of two coordinate axes, i.e. X and Y. Each grid pattern is used for coarse and fine digitizing to determine cursor positioning on each respective axis. Th digitizer has two basic modes of operation which relate to digitally representing the position of a cursor on a grid pattern. The first mode is for coarse digitizing designed to identify the position of the cursor within 11/2 grid lines of its actual position on the grid. The second mode is the fine digitizing mode which is operative to positively locate the cursor at its actual position within a triad of grid lines which have been identified through the coarse digitizing operation. Both modes are operative for each of the two axes. For coarse digitizing, a sequential line-to-line pulsing technique is applied. For fine digitizing, a pulsed three phase system is utilized and any odd multiple of three grid lines.