摘要:
A metrology system and method for measuring the thickness of thin-films of semiconductor wafer. This system and method analyze x-ray reflectivity data to determine transmission characteristics of thin-film layers. Based on these transmission characteristics the thickness of the thin-layer can be determined. Unlike some prior systems and methods, the system and method herein does not determine the thickness of the thin-film layer based on a fringe pattern in reflectivity for the thin-film layer. The fact that the system and method herein does not rely the fringe pattern is particularly advantageous in situations where the thin-film layer is of thickness which makes it very difficult to resolve the fringe pattern in the reflectivity data.
摘要:
In accordance with an embodiment of the invention, there is provided a system for cooling a load. The system comprises a closed loop primary refrigeration system comprising: a primary compressor taking in a primary refrigerant at a low pressure and discharging the primary refrigerant at a high pressure; an insulated enclosure comprising an inlet receiving the primary refrigerant at the high pressure from the primary compressor and an outlet returning the primary refrigerant at the low pressure to the primary compressor; at least one heat exchanger within the insulated enclosure receiving the primary refrigerant at the high pressure and cooling the primary refrigerant using a secondary refrigerant from a secondary refrigeration system, the secondary refrigerant being in heat exchange relationship with the primary refrigerant in the at least one heat exchanger; an expansion unit within the insulated enclosure receiving the primary refrigerant at the high pressure from the at least one heat exchanger and discharging the primary refrigerant at the low pressure; and a supply line delivering the primary refrigerant at the low pressure to the load and a return line returning the primary refrigerant from the load to the primary refrigeration system. The system further comprises the secondary refrigeration system, wherein the secondary refrigeration system comprises at least one secondary cryogenic refrigerator. A system control unit controls operation of at least one of the primary refrigeration system and the secondary refrigeration system to provide a variable refrigeration capacity to the load based on at least one of: a pressure of the primary refrigerant delivered to the load, and at least one temperature of the load.
摘要:
The invention provides a variable focus lens formed from a ring with a front surface and a rear surface, a flexible membrane is attached to a radially inner part of the front surface, and a front cover is attached to a radially outer part of the front surface, a rear cover is provided on the rear surface of the ring, preferably integral with the ring, so that a variable volume cavity is defined between the flexible membrane, the ring and the rear cover, second flexible membrane can be provided between the ring and the rear cover, where the invention also provides a method of filling a variable focus lens, and an adjustment mechanism for varying the focus of the lens.
摘要:
Bulk solidifying amorphous alloys exhibiting improved processing and mechanical properties and methods of forming these alloys are provided. The bulk solidifying amorphous alloys are composed to have high Poisson's ratio values. Exemplary Pt-based bulk solidifying amorphous alloys having such high Poisson's ratio values are also described. The Pt-based alloys are based on Pt—Ni—Co—Cu—P alloys, and the mechanical properties of one exemplary alloy having a composition of substantially Pt57.5Cu14.7Ni5.3P22.5 are also described.
摘要:
A valve device for a variable lens comprises: an inlet for receiving fluid from a reservoir; an outlet for passing fluid to a lens cavity; and a valve member, the valve member comprising a passageway for fluid communication between the inlet and outlet and a valve for closing the passageway; wherein the valve is actuated by turning the valve member about an axis of rotation and the passageway extends along the valve member in the axial direction.
摘要:
Methods and systems for managing transaction card accounts in which cardholders are permitted to incur transaction charge balances on existing transaction card accounts and substituting the existing transaction card for each of at least a portion of the plurality of cardholders with a different transaction card product upon an occurrence of one of termination of a private label or co-branded agreement and a predetermined level of inactivity on the transaction card account which has significant additional features and benefits absent from the existing transaction card product.
摘要:
The present invention is directed to an assistive mobility device, for example a walking stick or a crutch, for ergonomically assisting its user to traverse both urban and more challenging terrain. The device includes an elongated pole to support the user and a hand grip by which the user grips the proximate end of the pole. The hand grip is connected to the pole through a user-adjustable damper for absorbing shock. A variety of interchangeable tips are available for the distal end of the pole to adapt the device for a variety of terrains and uses.
摘要:
A method of forming a glass melt including heating a glass feed material in a first melting furnace to form a glass melt, flowing the glass melt into a second melting furnace through a refractory metal connecting tube, and further heating the glass melt in the second melting furnace. The refractory metal connecting tube is heated to prevent the molten glass from excessive cooling, and to ensure that the glass melt entering the second melting furnace is equal to or greater than the temperature of the glass melt in the second melting furnace. An apparatus for performing the method is also disclosed.