Comparison of experimental and predicted performance of 150-millimeter-bore solid and drilled ball bearings to 3 million DN

Seven 150-millimeter-bore ball bearings were run under 8900-newton (2000-lbf) thrust load at speeds from 6670 to 20,000 rpm (1 million to 3 million DN). Four of the bearings had conventional solid balls, and three bearings had drilled (cylindrically hollow) balls with 50-percent mass reduction. The bearings were under-race cooled and slot lubricated with a type 2 ester oil at flow rates from 4.35 x 0.001 to 5.94 x 0.001 cubic meter/min (1.15 to 1.57 gal/min). Friction torque and temperature were measured on all bearings. While there was considerable spread in the temperature data, the drilled ball bearings tended to run slightly cooler than the solid ball bearings at higher speeds. No significant difference in torque was noted, however, between the solid and drilled ball bearings. One bearing of each type was rerun at 17,800-newton (4000-lbf) thrust load. The solid ball bearings performed satisfactorily at 3 million DN. However, at about 2 million DN the drilled ball bearing experienced a broken ball, and cracks appeared in other balls as a result of flexure fatigue. Metallurgical examination of the cracked balls indicated a brittle structure in the bore of the drilled balls

Dynamic load capacities of graphite fiber: Polyimide composites in oscillating plain bearings to 340 C (650 F)

Load capacities were determined for plain spherical bearings with self-lubricating spherical elements of graphite-fiber-reinforced-polyimide, and for plain cylindrical bearings with thin-wall liners of the composite in the bearing bores. Composites consisted of a 1-to-1 weight ratio of graphite fibers and polyimide. Oscillation was at an amplitude of + or - 15 deg at a frequency of 1 hertz. Bearings with composite ball material had a load capacity of approximately 69 MN/sq m (10 000 psi) at room temperature 25 MN/sq m (3600 psi) at 340 C (650 F). Bearings with thin-wall composite liners had much higher load capacities of 280 MN/sq m (40 000 psi) at room temperature amd 240 MN/sq m (35 000 psi) at 320 C (600 F). Friction coefficients were in the range of 0.12 to 0.19. The addition of 10 wt.% graphite fluoride solid lubricant to the composition of the thin-wall liners reduced friction coefficients into the range of 0.10 to 0.12

Benjamin H. Munson, Guitar

Suite in D / Michael Praetorius, transcribed by Patrick Russ; 1st Cello Suite, BWV 1007 / J.S. Bach; Aria detta la Frescobalda / Girolamo Frescobaldi; La Catedral / Agustin Barrios; Leyenda (Asturias) / Isaac Albeniz, arranged by Sophocles Papas; Ricercare XIX; Fantasia VI / Francesco da Milan

Benjamin H. Munson, Classical Guitar

Ricercare XIX; Fantasia VI / Francesco da Milano; Suite in D / Michael Praetorius; transcribed by Patrick Russ; Aria con Variazioni Detta La Frescobalda / Girolamo Frescobaldi; Cello Suite No. 1, BWV 1007 / Johann Sebastian Bach; Prelude No. 1 / Heitor Villa-Lobos; Capricho Arabe (Serenata) / Francisco de Asís Tárrega y Eixea; Asturias Leyenda / Isaac Albeniz; arranged by Sophocles Papa

An atlas of 1975 GEOS-3 radar altimeter data for hurricane/tropical disturbance studies, volume 1

Geographic locations of 1975 hurricanes and other tropical disturbances were correlated with the closest approaching orbits of the GEOS-3 satellite and its radar altimeter. The disturbance locations and altimeter data were gathered for a seven-month period beginning with GEOS-3 launch in mid-April 1975. Areas of coverage were the Atlantic Ocean, the Carribean, the Gulf of Mexico, the west coast of the continental United States, and the central and western Pacific Ocean. Volume 1 contains disturbance coverage data for the Atlantic Ocean, Gulf of Mexico, and Eastern Pacific Ocean. Central and Western Pacific coverage is documented in Volume II

\u3ci\u3eState v. Parker\u3c/i\u3e: Searching the Belongings of Nonarrested Vehicle Passengers During a Search Incident to Arrest

The Fourth Amendment to the U.S. Constitution and Article I, Section 7 of the Washington Constitution generally require a warrant supported by probable cause to conduct a search or seizure. One exception to these requirements is a search incident to arrest, which permits the police to search arrested persons and the area within the arrestee\u27s reach for weapons and evidence. Prior to State v. Parker, when police arrested an occupant of an automobile in Washington, they could search the entire passenger compartment of the vehicle with the exception of locked containers. In State v. Parker, a plurality of the Supreme Court of Washington declared that during the search of an automobile incident to arrest police may not search the belongings of individuals who are not arrested, The Parker plurality would not permit police to search a container they know or should know is owned by a nonarrested individual unless they have reasonable suspicion that the container holds a weapon or evidence of crime. This Note argues that the Parker plurality deviates from state and federal precedent by (1) using ownership instead of access to immunize items from search, (2) concluding that vehicle passengers have an increased level of privacy protection under the Washington Constitution, and (3) characterizing a search incident to arrest as a Terry search. This Note concludes that the plurality\u27s failure to follow precedent and inability to formulate a clear majority rule will confuse lower courts and endanger officers by preventing them from searching any item in a car that may contain a weapon

Comparative evaluation of predicted and measured performance of a 68-cubic meter truncated reverberant noise chamber

The performance of a medium size, truncated reverberation chamber is evaluated in detail. Chamber performance parameters are predicted, using classical acoustic theory, and are compared to results from actual chamber measurements. Discrepancies are discussed in relation to several available empirical corrections developed by other researchers. Of more practical interest is the confirmation of a recent theory stating that the present guide for the ratio of specimen volume to test chamber volume, approximately 10 percent, is overly conservative, and can be increased by a factor of at least 2 and possibly 3. Results and theoretical justification of these findings are presented

Child\u27s Wish

1. Oh I long to lie dear Mother, On the cool and fragrant grass, With the calm blue sky above my head; And the shadowy clouds that pass. And I want the bright bright sunshine All round about my bed, I\u27ll close my eyes and God will think your little boy is dead. 2. Then Christ will send an angel To take me up to Him; He will bear me slow and steadily Far through the ether dim, He will gently gently lay me Close by the Saviour\u27s side; And when I\u27m sure that I\u27m in Heav\u27n My eyes I\u27ll open wide. 3. And I\u27ll look among the angels Who stand around the throne, Till I find my sister Mary, For I know she must be one; And when I find her, mother, We will go away alone, I will tell her how we\u27ve mourn\u27d for her All the while that she\u27s been gone. 4. Oh! I shall be delighted, To hear her speak again, Though I know she\u27ll not return to us, To ask her would be vain; So I\u27ll put my arms around her, And look into her eyes, And remember all I say to her, And all her sweet replies. 5. And then I\u27ll ask the angel, To take me back to you; He will bear me slow and steadily, Down through the ether blue, And you\u27ll only think dear mother, That I\u27ve been out to play, And have gone to sleep beneath the tree This sultry summer day

Effect of ball geometry on endurance limit in bending of drilled balls

Four designs of drilled (cylindrically hollow) balls were tested for resistance to bending fatigue. Bending fatigue has been demonstrated to be a limiting factor in previous evaluations of the drilled ball concept. A web reinforced drilled ball was most successful in resisting bending fatigue. Another design of through drilled design, involving a heavier wall than the standard reference ball, also showed significant improvement in resistance to bending fatigue

First Experiences Integrating PC Distributed I/O Into Argonne's ATLAS Control System

First Experiences Integrating PC Distributed I/O Into Argonne's ATLAS Control System The roots of ATLAS (Argonne Tandem-Linac Accelerator System) date back to the early 1960s. Located at the Argonne National Laboratory, the accelerator has been designated a National User Facility, which focuses primarily on heavy-ion nuclear physics. Like the accelerator it services, the control system has been in a constant state of evolution. The present real-time portion of the control system is based on the commercial product Vsystem [1]. While Vsystem has always been capable of distributed I/O processing, the latest offering of this product provides for the use of relatively inexpensive PC hardware and software. This paper reviews the status of the ATLAS control system, and describes first experiences with PC distributed I/O.Comment: ICALEPCS 2001 Conference, PSN WEAP027, 3 pages, 1 figur