Bearing optimization for SSME HPOTP application

The space shuttle main engine (SSME) high-pressure oxygen turbopumps (HPOTP) have not experienced the service life required of them. To improve the life of the existing turbopump bearings, modifications to the bearings that could be retrofitted into the present bearing cavity are being investigated. Several bearing parameters were optimized using the computer program SHABERTH, which performs a thermomechanical simulation of a load support system. The computer analysis showed that improved bearing performance is feasible if low friction coefficients can be attained. Bearing geometries were optimized considering heat generation, equilibrium temperatures, and relative life. Two sets of curvatures were selected from the optimization: an inner-raceway curvature of 0.54, an outer-raceway curvature of 0.52, and an inner-raceway curvature of 0.55, an outer-raceway curvature of 0.53. A contact angle of 16 deg was also selected. Thermal gradients through the bearings were found to be lower with liquid lubrication than with solid film lubrication. As the coolant flowrate through the bearing increased, the ball temperature decreased but at a continuously decreasing rate. The optimum flowrate was approximately 4 kg/s. The analytical modeling used to determine these feasible modifications to improve bearing performance is described

High-pressure calorimeter chamber tests for liquid oxygen/kerosene (LOX/RP-1) rocket combustion

An experimental program was conducted to investigate the rocket combustion and heat transfer characteristics of liquid oxygen/kerosene (LOX/RP-1) mixtures at high chamber pressures. Two water-cooled calorimeter chambers of different combustion lengths were tested using 37- and 61-element oxidizer-fuel-oxidizer triplet injectors. The tests were conducted at nominal chamber pressures of 4.1, 8.3, and 13.8 MPa abs (600, 1200, and 2000 psia). Heat flux Q/A data were obtained for the entire calorimeter length for oxygen/fuel mixture ratios of 1.8 to 3.3. Test data at 4.1 MPa abs compared favorably with previous test data from another source. Using an injector with a fuel-rich outer zone reduced the throat heat flux by 47 percent with only a 4.5 percent reduction in the characteristic exhaust velocity efficiency C* sub eff. The throat heat transfer coefficient was reduced approximately 40 percent because of carbon deposits on the chamber wall

Stakeholder perspectives on the development of a virtual clinic for diabetes care : qualitative study

Background: The development of the Internet has created new opportunities for health care provision, including its use as a tool to aid the self-management of chronic conditions. We studied stakeholder reactions to an Internet-based “virtual clinic,” which would allow people with diabetes to communicate with their health care providers, find information about their condition, and share information and support with other users. Objective: The aim of the study was to present the results of a detailed consultation with a variety of stakeholder groups in order to identify what they regard as the desirable, important, and feasible characteristics of an Internet-based intervention to aid diabetes self-management. Methods: Three focus groups were conducted with 12 people with type 1 diabetes who used insulin pumps. Participants were recruited through a local diabetes clinic. One-on-one interviews were conducted with 5 health care professionals from the same clinic (2 doctors, 2 nurses, 1 dietitian) and with 1 representative of an insulin pump company. We gathered patient consensus via email on the important and useful features of Internet-based systems used for other chronic conditions (asthma, epilepsy, myalgic encephalopathy, mental health problems). A workshop to gather expert consensus on the use of information technology to improve the care of young people with diabetes was organized. Results: Stakeholder groups identified the following important characteristics of an Internet-based virtual clinic: being grounded on personal needs rather than only providing general information; having the facility to communicate with, and learn from, peers; providing information on the latest developments and news in diabetes; being quick and easy to use. This paper discusses these characteristics in light of a review of the relevant literature. The development of a virtual clinic for diabetes that embodies these principles, and that is based on self-efficacy theory, is described. Conclusions: Involvement of stakeholders is vital early in the development of a complex intervention. Stakeholders have clear and relevant views on what a virtual clinic system should provide, and these views can be captured and synthesized with relative ease. This work has led to the design of a system that is able to meet user needs and is currently being evaluated in a pilot study

Optical devices and methods employing nanoparticles, microcavities, and semicontinuous metal films

An optical sensing enhancing material (and corresponding method of making) comprising: a medium, the medium comprising a plurality of aggregated nanoparticles comprising fractals; and a microcavity, wherein the medium is located in a vicinity of the microcavity. Also an optical sensor and sensing method comprising: providing a doped medium, the medium comprising a plurality of aggregated nanoparticles comprising fractals, with the material; locating the doped medium in the vicinity of a microcavity; exciting the doped medium with a light source; and detecting light reflected from the doped medium. Also an optical sensing enhancing material comprising a medium, the medium comprising a semicontinuous metal film of randomly distributed metal particles and their clusters at approximately their percolation threshold. The medium preferably additionally comprises a microcavity/microresonator. Also devices and methods employing such material

The Ursinus Weekly, December 14, 1953

MSGA-WSGA together, discuss U.C. honor system • Committee to pick Spring production • Senate hears complaints; Struth heads Booster Committee • MSGA warns men\u27s dorms • Audience stirred by Messiah, Thursday • Christmas Communion to be conducted by Chi Alpha • Morning watch services to be conducted this week by Y • Who\u27s who honors twelve in Ursinus class of 1954 • Debating Team opens season at tournament • Zimmerman, Price are lord, lady of senior ball • Alpha Psi Omega initiates new members, Kuebler, Allen • Editorials: Christmas spirit; Resolutions for a happy New Year • Letters to the editor • No Christ this Christmas? • Ursinus to participate in bridge tournament • Engagement announced • First Ursinus Christmas Fun in a magical snowfall • Awards available for graduate work • Mr. Dolman and Dr. Rice bring varied experience to new job • Paolone leads matmen; Expect excellent season • Phyl Stadler is hockey captain • Maliken, Aden are most valuable players: Football fullback, soccer halfback receive new honor • Belles begin practice; Friedlin leads cagers • Bears fall to Juniata; Wallop Pharmacy, 99-83 • Syvertsen captains mermaids; Excellent season expectedhttps://digitalcommons.ursinus.edu/weekly/1485/thumbnail.jp

The Ursinus Weekly, November 2, 1953

Quartets to hold program Friday, Nov. 6 • Wagner to speak on Founders Day • Juniors to sponsor dance, Penthouse serenade, Nov. 7 • Model S.C. held at Penn State • Fraternities continue rushing week activity • Group production will be given Tuesday night • Thirty-eight accept bids from sororities, Saturday • Dramatic play to be enacted by thespians • Bloodmobile will be at Ursinus, Nov. 3 • Big-little sister party to be held in rec center • SWC visits Salvation Army; Many attend vespers, Sunday • Executive committee elected by frosh to plan for class • Editorials: Rushing can be improved • Needed: Cash! • Letters to the editor • New preceptresses at South, Fircroft, Clamer • Dr. Phillips reads story by O. Wilde • Cornstalk capers is theme of dance presented by sophs • Junior preceptress tells woes and worries of job • Campus landmark views all Ursinus • Fraternities at Ursinus have interesting history • Eleanor Marcon is golf champion • Spirit, skill aid soccer; Team holds .750 record • JVs win 1-0 on Lewis goal • Stadler, Dawkins score as Belles top Swarthmore 4-1 • Merrifield, Price make first All-College • Bears in fourth victory topple strong Wagner, 14-6 • U.C. leads in tourney games • Temple cops four first team slots • Belles win three; Beat Beaver, 4-0 • Bakermen lose to Swarthmore, 6-1https://digitalcommons.ursinus.edu/weekly/1481/thumbnail.jp

The Ursinus Weekly, December 7, 1953

Prom to feature Johnny Austin, Sr. lord and lady • Wanamaker to give $1,000 scholarship • Sella resigns as senior prexy; Popowich unanimously chosen • Sixteenth Messiah performance to be held in Bomberger, Thursday • IRC to hear Chester Bowles at Bryn Mawr tonight • William S. Pettit named Dean of Ursinus College • MSGA hears student ideas at meeting • Raises revised by Stars and Players • Marge Merrifield wins hockey honor • Y plans party • Editorials: Honor at Ursinus; Maintenance mixup? • Cutting • Greek columns • Thespians present All my sons ; Reviewer notes fine performances • Pledge reveals fun and difficulties of informal Ursinus sorority initiation • Dorms eagerly anticipate vendors\u27 nightly visit • Hockey team ends season • JV Belles down Penn, W. Chester, Bryn Mawr • Soccermen lose to F&M; Season ends with party • Third team undefeated • Basketball season opens; Bears win, 84-66; 78-56 • Walker, Cox head 1954 football, soccer elevens • Dickinson downs Ursinus in football finale, 19-13 • Hockey-soccer game ends in 2-2 tie • Christmas vespers service to be held December 13 • Chemical society members visit chemical exposition • Truex speaks to pre-medders on opportunities in medicine • French Club holds program of vocal, piano music • Christmas dance plannedhttps://digitalcommons.ursinus.edu/weekly/1484/thumbnail.jp