345 results about "Reverse effect" patented technology

A guideless stage for aligning a wafer in a microlithography system is disclosed, and a reaction frame is disclosed which isolates both external vibrations as well as vibrations caused by reaction forces from an object stage. In the guideless stage an object stage is disclosed for movement in at least two directions and two separate and independently movable followers move and follow the object stage and cooperating linear force actuators are mounted on the object stage and the followers for positioning the object stage in the first and second directions. The reaction frame is mounted on a base structure independent of the base for the object stage so that the object stage is supported in space independent of the reaction frame. At least one follower is disclosed having a pair of arms which are respectively movable in a pair of parallel planes with the center of gravity of the object stage therebetween. The linear positioning forces of the actuator drive means are mounted and controlled so that the vector sum of the moments of force at the center of gravity of the object stage due to the positioning forces of the drive means is substantially equal to zero. The actuator mounting means can include at least two thin flexible members mounted in series with the primary direction of flex of the members being orthogonal to one another.

An insert device for use in a communication jack includes a housing, and plug interface contacts mounted with respect to the housing. At least one plug interface contact includes a first length extent extending along a first axial path and defining a first reaction surface that includes a first electrically conductive surface. The insert device includes a reactance unit having a reactance circuit operable to reduce or compensate for an electrical noise associated with signals conducted by the plug interface contacts, and a plurality of interconnection elements. At least one interconnection element defines a second reaction surface that includes a second electrically conductive surface. The insert device moves the reactance circuit relative to the plug interface contact by sliding the second reaction surface across the first reaction surface, and presses the second electrically conductive surface against the first electrically conductive surface.

A protective wind energy conversion chamber provides a protected multiple turbine mechanism axially aligned to convert kinetic energy of a moving fluid (e.g., wind) into rotational mechanical power by the reaction of the moving fluid with the turbine. The conversion chamber may either be configured as a vertical axis wind turbine (VAWT) or horizontal axis wind turbine (HAWT). The conversion chamber repositions an intake windward to collect and concentrate the wind prior to converting the wind into energy via the axially aligned multi-turbine mechanism. The remaining wind is released via a leeward-facing exhaust. Completely enclosed by the protective wind energy conversion chamber, the axially aligned multi-turbine mechanism avoids interference by birds and other outside objects.

A seismic energy dissipation system for use with structures such as buildings, bridges and the like. The system includes a gravity frame, at least one reaction frame, and connection apparatus for connecting the gravity frame and the reaction frame. The connection apparatus includes springs for setting a period of response and energy dissipation units for dissipating energy within the structure, thus controlling the response of a structure with respect to internal forces, accelerations and deformations due to external excitations such as wind or earthquake.

An active tremor control system for stabilizing against alternating perturbations includes: an inertial sensor for sensing angular motion about a first axis of an object induced by alternating perturbations; an inertial mass independent of the object; and an actuator coupled to the object and the mass and responsive to the inertial sensor for selectively applying a torque to the object representative of the sensed angular motion such that the angular motion about the first axis induced by the perturbation is cancelled, the actuator concurrently applying a reactive torque, equal and opposite to the to the applied torque, to the mass.

A method for controlling the activity of drugs on or in drug-coated or drug-loaded implantable devices, such as stents or other metallic devices, uses non-invasive, inductive heating of such device. The heating of a device, such as stent, can be used to release drugs applied to the stent in release layers, to activate drugs on the stent that have little or no activity at body temperature and to enhance for defined periods the reaction environment at the stent for drug-adjacent tissue interactions. Reverse effects of deactivation of drugs upon heating are also possible.

Force feedback in large, immersive environments is provided by device which a gyro-stabilization to generate a fixed point of leverage for the requisite forces and/or torques. In one embodiment, one or more orthogonally oriented rotating gyroscopes are used to provide a stable platform to which a force-reflecting device can be mounted, thereby coupling reaction forces to a user without the need for connection to a fixed frame. In one physical realization, a rigid handle or joystick is directly connected to the three-axis stabilized platform and using an inventive control scheme to modulate motor torques so that only the desired forces are felt. In an alternative embodiment, a reaction sphere is used to produce the requisite inertial stabilization. Since the sphere is capable of providing controlled torques about three arbitrary, linearly independent axes, it can be used in place of three reaction wheels to provide three-axis stabilization for a variety of space-based and terrestrial applications.

A system for communicating information, particular for use in a hydrocarbon well, is described including one or more releasable vessels having radio frequency (RF) circuitry responsive, when in use, to an RF reader system, the vessel including counteracting means to reduce the effect of destabilizing flow forces thereby extending the coupling time with the reader system.

The invention provides a balancing and positioning system for a workpiece platform of a photoetching machine, which comprises a photoetching machine frame, a pedestal, a first compensation module, a first balancing mass block, two second compensation modules, a second balancing mass block, two second motor stators, two second motor rotors, a first motor stator and at least one force moment eliminator which is arranged on the side edge of the pedestal. The balancing and positioning system eliminates the reaction force moment of an exposure platform generated under the condition of acceleration through the force moment eliminator, and greatly reduces the impact force on the pedestal when the workpiece platform system carries loads under the condition of acceleration.

A variator assembly comprising a variator of the toroidal-race rolling-traction type. The assembly has input and output discs and rollers which are acted on by hydraulic roller control actuators. They are positioned between the discs to transmit torque from one disc to the other. Hydraulic end loading means supplied with fluid at an end load pressure to apply an end load to bias the discs and the rollers toward each other, thereby enabling the transmission of torque. Reaction pressure supply means are connected to the roller control actuators to cause them to apply an adjustable reaction force to the rollers. The assembly also has hydraulically influenced valve means which serve to compare an input related to the end load pressure with an input related to the reaction pressure and to control the end load pressure in dependence upon the comparison, thereby maintaining a relationship between the end load and reaction pressures. Adjustment means are provided to adjust the relationship between the end load and reaction pressures.

The invention relates to the research field of a microgravity simulating platform of a space robot, in particular to a microgravity air floatation target satellite simulator system with five degrees of freedom. The system consists of three parts, namely a movement simulator, a satellite simulator and a ground control panel. The movement simulator simulates the states of zero gravity, low friction and micro interference of a base satellite; the satellite simulator has a basic single-shaft attitude adjustment and track control function under a condition that a satellite provided by the movement simulator is in a track movement simulating environment, comprises a sensor, a controller and an actuating mechanism (a counteractive flywheel and a cold gas injecting system), and is provided with auxiliary systems such as a power system, a wireless communication assembly, a structural component and the like; and the ground control panel provides a basic function of the wireless data communication between a target satellite and the ground, and realizes the control on the target satellite and the receiving, storage and display of the data.

In one embodiment of the present invention, a drive assembly for a seismic land vibrator is provided. The drive assembly comprises at least a first spring element. The first spring element operates in at least two vibration modes in a seismic frequency band of interest. The drive assembly also comprises a baseplate, a driver, and a reaction mass. The driver interacts with the reaction mass and the first spring element to transfer energy to the baseplate.

A pressure relief device and a hydraulic fracturing system having a pressure relief device are provided. In one form, the pressure relief device has a valve body with a linearly extending throughbore between the inlet and outlet thereof. A rupture disc is secured in the valve body so that a frangible dome wall portion thereof has a reverse-acting orientation in the valve body bore. The hydraulic fracturing system includes a pump and a delivery line that receives pressurized fracturing fluid from the pump and delivers it to a well. A pressure relief device is installed along the delivery line. A sensor detects fluid flow downstream of the pressure relief device which allows the pump to be shut down when the downstream fluid flow is detected. The pressure relief device can have a body with a domed rupture disc and the sensor therein.

A wind turbine hybrid braking system is presented. The system includes a generator coupled to a main shaft of the wind turbine for generating and transmitting power. A mechanical brake is coupled to the main shaft for applying reaction torque upon braking of the wind turbine. The system further includes an electrical braking circuit coupled to the generator for acting in conjunction with the mechanical brake and dissipating active power via controlled switching.

A system and method for managing inertial torque reactions on stationary powertrain structure rotate at least one selected engine component and at least one selected drive train component in opposite directions so the rotational inertia of the selected drive train component acts in a direction opposite to that of the rotational inertia of the selected engine component to reduce or eliminate the inertial torque reactions on stationary powertrain structure caused by rotational acceleration and deceleration of powertrain components and improves performance with respect to noise, vibration, and harshness (NVH).

This invention discloses a method for testing inbreak, which obtains the information of software behavior characters of a program, a structure access model and acts it on the program to prevent abnormal behavior so as to protect the entire network server system to avoid network inbreak including the following basic processes: collecting and processing a behavior security box to monitor the software behavior timely and a protection system suitable for the above mentioned method is also disclosed to realize the close coupling control to the behavior of the applied program.

A spring member for disc-brake calipers is interposed between a lateral edge of at least one pad and reaction surfaces of the caliper so as to act resiliently on the pad. The spring member comprises a ‘U’-shaped portion suitable for forming a connection with a protuberance of the reaction surfaces, a first resilient portion suitable for acting on the pad in a tangential direction, and a second resilient portion suitable for acting on the pad in a radial direction. The first and second resilient portions constitute a single body projecting from a first connection end of the first resilient portion that is connected to the ‘U’-shaped portion, so that, when the at least one pad is in a mounted configuration, it is acted on resiliently by the spring member both in a radial direction and in a tangential direction.