摘要:
A reduction of sample loss from a container open to atmosphere, and including liquid trifluoroacetic acid (TFA), is carried out by a variety of methods each of which reduces creep of TFA up the walls of the container. In one method, particularly applicable to microtitre plates, each container or well is sealed by a cap which is retained by a strap (FIGS. 4 and 5). In another method the top of the container is formed with a downwardly pointing entrance tube, in the form of an unspillable inkwell (FIG. 2), where the container is a screw top vial, the entrance tube is sealed around the top of the neck of the vial (FIG. 9b).
摘要:
A stabilizer link or tie rod is provided with a ball and stud and with a housing with an outer surface and with an interior surface defining a ball cavity. The housing is connected with a link rod. A race insert is provided having a housing liner surface engaging the housing interior surface and an interior ball race surface in contact with the ball and a housing end portion defining a closure interface with the housing. A protective cap is provided with a barrier surface extending over the closure interface and over the housing outer surface. The cap has a retaining surface engaging each of the housing and the rod.
摘要:
A sample holder is described, for use in centrifugal evaporators, which permits accelerated evaporation of solvents from samples while ensuring that samples from which evaporation is complete are not damaged by overheating. The sample holder is radiantly heated and has sample containers mounted either directly in it, or in intermediate holders themselves mounted in it. The sample holder imparts heat to the samples and has a cross-sectional area chosen such that no appreciable temperature gradient exists between the radiantly or otherwise heated surfaces of the holder and the sample containers. The sample containers are mounted in the holder at an angle between 35° and 65° to the vertical and orientated such that centrifugal force tends to retain the sample material in the containers. The sample holder may be combined with other holders in a stack, the joints between adjacent holders in the stack being adapted to minimize the temperature difference across them.
摘要:
An in-floor fitting that is adapted to be inserted within an opening in a concrete floor, includes a plurality of signal connection devices, and a cover positioned over the plurality of signal connection devices. The cover includes a sliding door that is configured to slide through open and closed positions, wherein the plurality of signal connection devices are accessible when the sliding door is in the open position, and wherein the plurality of signal connection devices are protected from an external environment when the sliding door is in the closed position.
摘要:
Embodiments of the present invention include an in-floor fitting for providing access to an underfloor electric distribution system. The in-floor fitting includes a cover configured to move between open and closed positions and being moved to an open position to allow a cable to pass therethrough. The in-floor fitting includes a receptacle positioned below the cover and configured to operatively connect to a cable comprising at least one of an electrical cable and a communication cable, wherein the cover is substantially flush with a surface of a floor when the cable is operatively connected to the receptacle and the cover is in the closed position.
摘要:
Embodiments of the present invention include an in-floor fitting. The in-floor fitting includes a trim ring and an internal housing. The internal housing includes at least one of an electrical and communication receptacle and is configured to be positioned in an open position in which the at least one of an electrical and communication receptacle is positioned above a surface of a floor, and a closed position in which the at least one of an electrical and communication receptacle is positioned below a surface of the floor.
摘要:
A steer-by-wire handwheel actuator in a vehicle is presented. The handwheel actuator comprises a driver input shaft; a gear train connected to the driver input shaft; a motor responsive to control signals from a controller and variably geared to the gear train; a electro-mechanical brake responsive to the control signals from the controller and geared to one of the driver input shaft and the gear train; and a stop mechanism attached to a housing and coupled to one of the electro-mechanical brake and the gear train.
摘要:
A method is described for evaporating liquid samples contained in sample holders mounted within a chamber and rotated by the rotor during an evaporation process in which the pressure in the chamber is reduced below atmospheric and the sample holders are rotated at high speed so as to exert centrifugal force on the contents of the holders. Heat is supplied to elevate the temperature of the liquid component of the samples to assist in the evaporation process. The temperature of the sample material is continuously or regularly monitored during the evaporation process and temperature signals are transmitted to a remote computing means which is programmed to generate a control signal for controlling the supply of heat to the samples and controlling the evaporation process. The temperature may be sensed by a probe in a sample holder containing an evaporating liquid sample, or in an adjoining sample holder containing a buffer liquid. The rotational speed is also sensed and a speed signal conveyed to the computing means. In an alternative method the rate of flow of vapour from the chamber is monitored and a flow rate signal is computed which is also supplied to the computer means and the evaporation process is controlled in relation to the value of the vapour flow rate signal. Improved methods of heating and means for supporting sample holders which are to be heated, to achieve more uniform heating thereof, within an evaporating chamber, are described. Apparatus for performing the various methods is also described.
摘要:
A fluid pump having an outer cylindrical housing (10) rotating relative to an inner hub (44) from which radially projects a probe (52) apertured in its external surface to be exposed to the flow therepast of an annulus of operational liquid (14) constrained in a circular path of motion by the rotating housing, the probe having an internal passage for communicating the aperture with a first external space and the inner liquid-free space in the housing having an outlet for communicating with a second external space. In use, fluid to be pumped is sucked out of the apertured probe to emerge as fluid bubbles which migrate through the rotating liquid annulus to the liquid-free center, then to pass to the outlet.
摘要:
Thin strip crystals are grown by pulling the growing crystal from the melt, through a thin slit, the walls of which are not wetted by the melt. The stability of growth at the edges of the strip is achieved by maintaining the pressure of the melt adjacent the interface between crystal and melt above a critical level which is such as to cause the meniscus of the melt to be convex on all sides of the growing crystal. The critical pressure is defined as2S/b+.sqroot.2SzgwhereS is the surface tension of the crystallizable materialb is the thickness of the slitz is the density of the meltg is the acceleration due to gravity;and the depth of the slit is at least (2S/zg).sup.1/2, preferably (32S/zg).sup.1/2 to ensure that a pressure exceeding the critical pressure can be developed and maintained without the liquid spilling out of the slit. The walls of the slit can be parallel or divergent in the direction in which the crystal is pulled, this divergence being necessary with certain materials. An arrangement is disclosed containing a head of the melt for creating the required pressure. An alternative arrangement is disclosed in which actuating devices, such as hydraulic piston and cylinder arrangements, create the pressure.