摘要:
A tool calibration system including a tool calibration fixture and a tool height and offset calibration insert for calibrating the position of a tool bit in a micromachining tool system. The tool calibration fixture comprises a yokelike structure having a triangular head, a cavity in the triangular head, and a port which communicates a side of the triangular head with the cavity. Yoke arms integral with the triangular head extend along each side of a tool bar and a tool head of the micromachining tool system. The yoke arms are secured to the tool bar to place the cavity around a tool bit which may be mounted to the end of the tool head. Three linear variable differential transformer's (LVDT) are adjustably mounted in the triangular head along an X axis, a Y axis, and a Z axis. The calibration insert comprises a main base which can be mounted in the tool head of the micromachining tool system in place of a tool holder and a reference projection extending from a front surface of the main base. Reference surfaces of the calibration insert and a reference surface on a tool bar standard length are used to set the three LVDT's of the calibration fixture to the tool reference position. These positions are transferred permanently to a mastering station. The tool calibration fixture is then used to transfer the tool reference position of the mastering station to the tool bit.
摘要:
A micromachining tool system with X- and omega-axes is used to machine spherical, aspherical, and irregular surfaces with a maximum contour error of 100 nonometers (nm) and surface waviness of no more than 0.8 nm RMS. The omega axis, named for the angular measurement of the rotation of an eccentric mechanism supporting one end of a tool bar, enables the pulse increments of the tool toward the workpiece to be as little as 0 to 4.4 nm. A dedicated computer coordinates motion in the two axes to produce the workpiece contour. Inertia is reduced by reducing the mass pulsed toward the workpiece to about one-fifth of its former value. The tool system includes calibration instruments to calibrate the micromachining tool system. Backlash is reduced and flexing decreased by using a rotary table and servomotor to pulse the tool in the omega-axis instead of a ball screw mechanism. A thermally-stabilized spindle rotates the workpiece and is driven by a motor not mounted on the micromachining tool base through a torque-smoothing pulley and vibrationless rotary coupling. Abbe offset errors are almost eliminated by tool setting and calibration at spindle center height. Tool contour and workpiece contour are gaged on the machine; this enables the source of machining errors to be determined more readily, because the workpiece is gaged before its shape can be changed by removal from the machine.
摘要:
Quadruplex-forming guanine-rich nucleic acid sequences are useful in compositions and methods for inhibiting cellular growth and proliferation and inducing cell death. Compositions for treating a patient are provided, including (i) a safe and effective amount of a sequence having at least 80% nucleic acid identity with a guanine-rich promoter gene oligonucleotide (GPGO), and (ii) a carrier, wherein the oligonucleotide forms at least one quadruplex.
摘要:
The present invention provides a method for inhibiting the proliferation of malignant and/or hyperplastic cells in a subject by administering to the subject a therapeutically effective amount of a guanosine rich oligonucleotide. The present invention also provides oligonucleotides which are capable of being specifically bound to a specific cellular protein which is nucleolin and/or nucleolin in nature, which is implicated in the proliferation of cells, specifically malignant and/or hyperplastic cells, and a method for their selection.
摘要:
Compositions and methods for modulating tumor proliferation in an individual are provided. The methods employ nucleolin-binding agents, such as aptamers. The aptamers of the present invention can be used to modulate the proliferation of malignant, dysplastic, hyperproliferative, and/or metastatic cells through interference with molecular interactions and functions of nucleolin in the tumor cell.
摘要:
The breathing apparatus disclosed includes a first connector structure which provides ports for connection to a supply of fresh breathing gases, to an afferent gas tube and to an afferent gas bag. The first connector structure also provides a port to which a ventilator can be connected, a port to which an efferent gas tube can be connected, and a connection to an efferent gas bag. The afferent gas tube is of larger diameter than the efferent gas tube. The apparatus further includes a second connector construction to which said tubes are connected and which has a port for connection to the patient. The second connector structure causes preferential flow between the patient port and the afferent gas tube port.
摘要:
A motion transmitting remote control assembly of the type for transmitting forces along a curved path by a flexible motion transmitting core element movably supported within a conduit. The core element is a stranded cable-like member having a first end extending from a support member secured to the conduit and supported by a support structure. A terminal member is disposed on the end of the core element and is operatively attached to a control member. The support member includes a male spherical end portion and a wiper means comprising a female spherical member is snapped onto the male spherical portion for swivelling movement. The female spherical member is in wiping engagement with the core element for preventing foreign matter on the extended length of the core element from entering into the conduit upon movement of the core element while at the same time allows the axis of the extended length of the core element to move in a conical area.
摘要:
The present invention provides a method for inhibiting the proliferation of malignant and/or hyperplastic cells in a subject by administering to the subject a therapeutically effective amount of a guanosine rich oligonucleotide. The present invention also provides oligonucleotides which are capable of being specifically bound to a specific cellular protein which is nucleolin and/or nucleolin in nature, which is implicated in the proliferation of cells, specifically malignant and/or hyperplastic cells, and a method for their selection.