Abstract: A hydrogen feed stream is introduced into a primary refrigeration system of a precooling system and cooling the hydrogen stream to a first precooling temperature. From there, the precooled hydrogen stream is then introduced to a secondary refrigeration system of the precooling system and cooling the precooled hydrogen stream to a second temperature. Next, the cooled hydrogen stream is then liquefied in the liquefaction system to produce liquid hydrogen. The refrigeration is provided by expansion of a pressurized gaseous nitrogen stream and vaporization of a liquid nitrogen stream that is sourced from a nearby air separation unit.

Abstract: An integrated industrial unit is provided, which can include: a nitrogen source comprising an air separation unit that is configured to provide pressurized gaseous nitrogen and liquid nitrogen; a hydrogen source; a hydrogen liquefaction unit, wherein the hydrogen liquefaction unit comprises a precooling system, and a liquefaction system; and a liquid hydrogen storage tank, wherein the precooling system is configured to receive the gaseous hydrogen from the hydrogen source and cool the gaseous hydrogen to a temperature between 70K and 100K, wherein the precooling system comprises a primary refrigeration system and a secondary refrigeration system, wherein the liquefaction system is in fluid communication with the precooling system and is configured to liquefy the gaseous hydrogen received from the precooling system to produce liquid hydrogen, wherein the liquid hydrogen storage tank is in fluid communication with the liquefaction system and is configured to store the liquid hydrogen received from the liquefact

Abstract: A hip stem centralizer datum guide and method are provided for positioning a proximal portion of a hip stem component within bone cement in an intramedullary canal of a femur. The datum guide is positionable in a predetermined position relative to the intramedullary canal and is able to create a datum that records the predetermined hip stem component position relative to the intramedullary canal. The datum is able to be referenced to position the hip stem component in the predetermined hip stem component position in the bone cement in the intramedullary canal.

Abstract: A direct drive robotic manipulator is provided which includes a plurality of segments that are rotatably coupled with respect to one another. A plurality of spindles connects the segments for relative rotation therebetween, and a plurality of direct drive assemblies is further coupled to the plurality of spindles. Each direct drive assembly encloses an end of a spindle and comprises a rotor assembly to which the spindle is attached for manipulating the spindle. A positional measurement apparatus may also be included at each direct drive assembly to ascertain an angular disposition of a segment relative to an adjoining segment.

Abstract: A hip stem centralizer datum guide (40, 100, 200, 300) and method are provided for positioning a proximal portion of a hip stem component (44) within bone cement in an intramedullary canal of a femur. The datum guide is positionable in a predetermined position relative to the intramedullary canal and is able to create a datum (70, 72, 74, 76, 120, 220, 302) that records the predetermined hip stem component position relative to the intramedullary canal. The datum is able to be referenced to position the hip stem component in the predetermined hip stem component position in the bone cement in the intramedullary canal.

Abstract: A heating apparatus and method for heating a semiconductor device during bonding of electrical contacts onto the device is provided, which includes a heating plate that is provided for heating the semiconductor device and a layer of compliant material extending over at least a portion of the heating plate for mounting the semiconductor device. A holding mechanism secures the semiconductor device on the layer of compliant material during bonding of electrical contacts onto the semiconductor device while it is being heated by the heating plate.

Abstract: A direct drive robotic manipulator is provided which includes a plurality of segments that are rotatably coupled with respect to one another. A plurality of spindles connects the segments for relative rotation therebetween, and a plurality of direct drive assemblies is further coupled to the plurality of spindles. Each direct drive assembly encloses an end of a spindle and comprises a rotor assembly to which the spindle is attached for manipulating the spindle. A positional measurement apparatus may also be included at each direct drive assembly to ascertain an angular disposition of a segment relative to an adjoining segment.

Abstract: A hip stem centralizer datum guide and method are provided for positioning a proximal portion of a hip stem component within bone cement in an intramedullary canal of a femur. The datum guide is positionable in a predetermined position relative to the intramedullary canal and is able to create a datum that records the predetermined hip stem component position relative to the intramedullary canal. The datum is able to be referenced to position the hip stem component in the predetermined hip stem component position in the bone cement in the intramedullary canal.

Abstract: A lamp device includes three resilient blades extended downward from a housing. The housing includes a lower peripheral flange extended radially inward and having an opening. A switch is secured to a panel of a plate which is fixed in the housing. A cover of light transmissible material is engaged in the housing and has a peripheral rib extended radially outward for engaging with the peripheral flange of the housing so as to be supported in the housing. The resilient blade is engaged with the peripheral rib of the cover so as to stably retain the cover in place.

Abstract: A ceiling fan includes a housing having a number of sockets disposed on the upper portion for engaging with lamps. A shaft extends upward from the housing for securing a lamp shade. A control box is secured to the lower portion of the housing and has a number of sockets for engaging with bulbs. A pole extends downward from the control box for securing another lamp shade. The lamp shades include either an open bottom portion or an open upper portion for air circulation purposes.