Abstract: A rotor such as a blisk B is balanced by determining the extent of any static or couple unbalance when the rotor is rotated about a test axis X while supported at a location surface 10 at which the rotor is supported in normal use. The location surface 10 is then modified, for example by removing material in a final machining operation, to eliminate the unbalance. For example the swash of the surface 10 may be altered and/or modification may be made to other location features (11) in order to cause the rotor to rotate, in normal operation, about an axis which is eccentric to the test axis X.

Abstract: A method of balancing a rotor (10), the said method comprising the steps of determining the position of the center of mass of a rotor (10) to be balanced prior to the rotor (10) being machined to its final dimensions, and machining the rotor (10) to its final dimensions by removing material substantially along the length of the rotor (10). The material is removed in the direction of its axis such that the center of mass of the rotor is adjusted to be substantially co-incident with its axis of rotation (22).

Abstract: A method of balancing a rotary device (12,14) for balanced rotational operation when connected to a drive shaft (24) by a flexible coupling (26,28). The method comprises the steps of connecting a drive shaft simulator (32,34) to a rotary device (12,14) and, rotating the said device (12,14) to simulate drive shaft unbalance due to misalignment of the rotary device (12,14) and the drive shaft (24) being simulated when the drive shaft (24) and rotary device (12,14) are connected together.

Abstract: A method of balancing a rotor (10), the said method comprising the steps of determining the position of the centre of mass of a rotor (10) to be balanced prior to the rotor (10) being machined to its final dimensions, and machining the rotor (10) to its final dimensions by removing material substantially along the length of the rotor (10). The material is removed in the direction of its axis such that the centre of mass of the rotor is adjusted to be substantially co-incident with its axis of rotation (22).

Abstract: A method of balancing a rotary device (12, 14) for balanced rotational operation when connected to a drive shaft (24) by a flexible coupling (26,28). The method comprises the steps of connecting a drive shaft simulator (32,34) to a rotary device (12, 14) and, rotating the said device (12, 14) to simulate drive shaft unbalance due to misalignment of the rotary device (12, 14) and the drive shaft (24) being simulated when the drive shaft (24) and rotary device (12, 14) are connected together.

Abstract: A method for providing a perfectly flat top with a sharp edge on a dynamic pressure sensor using a cup-shaped stretched membrane as a sensing element. First, metal is deposited on the membrane and surrounding areas. Next, the side wall of the pressure sensor with the deposited metal is machined to a predetermined size. Finally, deposited metal is removed from the top of the membrane in small steps, by machining or lapping while the pressure sensor is mounted in a jig or the wall of a test object, until the true top surface of the membrane appears. A thin indicator layer having a color contrasting with the color of the membrane may be applied to the top of the membrane before metal is deposited to facilitate the determination of when to stop metal removal from the top surface of the membrane.

Abstract: A fiber optic microphone is provided for measuring fluctuating pressures. An optical fiber probe having at least one transmitting fiber for transmitting light to a pressure-sensing membrane and at least one receiving fiber for receiving light reflected from a stretched membrane is provided. The pressure-sensing membrane may be stretched for high frequency response. Further, a reflecting surface of the pressure-sensing membrane may have dimensions which substantially correspond to dimensions of a cross section of the optical fiber probe. Further, the fiber optic microphone can be made of materials for use in high temperature environments, for example greater than 1000.degree. F. A fiber optic probe is also provided with a backplate for damping membrane motion. The backplate further provides a means for on-line calibration of the microphone.

Abstract: A fiber optic microphone is provided for measuring fluctuating pressures. An optical fiber probe having at least one transmitting fiber for transmitting light to a pressure-sensing membrane and at least one receiving fiber for receiving light reflected from a stretched membrane is provided. The pressure-sensing membrane may be stretched for high frequency response. Further, a reflecting surface of the pressure-sensing membrane may have dimensions which substantially correspond to dimensions of a cross section of the optical fiber probe. Further, the fiber optic microphone can be made of materials for use in high temperature environments, for example greater than 1000.degree. F. A fiber optic probe is also provided with a backplate for damping membrane motion. The backplate further provides a means for on-line calibration of the microphone.

Abstract: Certain amines are highly effective in controlling parasitic ticks.

Abstract: Certain amines are highly effective in controlling parasitic ticks.

Abstract: Synthetic polyhydroxylated steroidal lactones are found to be highly effective plant growth promoting substances.

Abstract: Certain amines are highly effective in controlling parasitic ticks.

Abstract: Some esters of alkanephosphonic acids are found to be highly lethal to nematodes and other helminths.

Abstract: Certain secondary and tertiary straight and branched chain amines and amides are found to be highly effective for controlling scabies mites and other parasitic mites.

Abstract: The present invention relates to an alternating inflatable support for the human body. The invention includes a flexible pillow having a plurality of fluid impervious pockets therein which are substantially flat when deflated, but which support an adjacent section of the human body when inflated with a fluid under pressure. The pockets are interspersed and grouped into an operably coupled first set of pockets and an operably coupled second set of pockets. A pump is provided which includes at least one pumping chamber for receiving and expelling fluid under pressure. A solenoid is operably coupled to the pumping chambers for compressing and expanding the pumping chambers. A valve is operably coupled between the pump and the flexible pillow for alternately inflating and exhausting the fluid through the first set of pockets and the second set of pockets, thereby alternately supporting the interspersed sections of the body adjacent to the first set of the pockets and the second set of pockets.

Abstract: Some secondary and tertiary straight and branched chain amides and amines were found to be highly lethal to nematodes and other helminths.

Abstract: Some secondary and tertiary straight and branched chain amides and amines were found to be highly lethal to nematodes and other helminths.