4,020 research outputs found
Blockage effects on the pressure field of 3D-printed small-scale jet nozzles
No full textThis paper presents a preliminary investigation into the pressure fields of jets exhausting from partially blocked nozzles. Measurements are performed for a series of asymmetric, smallscale, single stream nozzles mimicking the bypass flow from an engine-pylon-wing configuration. The hydrodynamic and acoustic pressure fields of the pylon nozzles are compared to data from an axisymmetric, annular jet baseline nozzle. For the good aerodynamic pylon designs, the isolated jet mixing noise source is slightly modified at azimuthal angles near the blockage. The blockage effects on the installed jet-wing interaction noise source are also small, even when corrections for thrust are applied. In-flight data suggest that a significant increase in the pressure levels exist at relatively high flight-to-jet-velocity ratios for the blocked configurations. For the poorly aerodynamically designed blockages, flow separation occurs close to the nozzle exit. This flow separation induces an augmentation of the jet noise sources. The near-field pressure data shows that the main effects of the pylon are, firstly, an increase in the strength of the hydrodynamic pressure field perpendicular to the pylon surface due to vortex shedding and, secondly, a fast recovery of symmetry downstream of the pylon trailing edge
Chapter 09: Reflections on Dr. Clifton Mountain and Data Collection Roles at MD Anderson
No full textMrs. Hermes begins this chapter with memories of how much she enjoyed working for Dr. Mountain over the course of 25 years. He taught her how to think about data, she explains, and she was listed as an author on a number of publications on lung cancer [see examples below]. She explains that Dr. Mountain left MD Anderson in 1993, but she continued to work freelance for him. She recalls that he set up the first conference on mathematics at MD Anderson, early in his career sometime in the sixties.
Next she comments on how the unique openness of Houston culture fit well with the bold visions that both R. Lee Clark and Eleanor MacDonald held for oncology. She says that her most important work was on Dr. Mountain’s staging system for lung cancer and she explains why staging the disease presented challenges.
She confirms that she was always interested in the implications of basic research for clinical findings. She credits Eleanor MacDonald for helping her to develop her curiosity and questioning style.https://openworks.mdanderson.org/mchv_interviewchapters/2036/thumbnail.jp
A survey of the turbulence statistics of a model-scale installed jet at low and moderate mach numbers
No full textIn modern high-bypass ratio engine configurations, the exhausted jet is deflected and modified by the wing and high lift devices. The present paper reports a survey on a model-scale jet in the presence of a flat plate installed at two height (h) and two length (l) positions from the center of the nozzle. The aim of this work is to evaluate the one-point statistics of isolated and installed jets. Experimental data of the axial component of the velocity is acquired for a 1½” nozzle via hot-wire anemometry. The investigation is made for several jet velocities, ranging from acoustical Mach numbers 0.2 to 0.8. Mean velocity profile results show a slight acceleration of the jet in regions close to the plate. This effect is notorious for plate locations in which the jet wets the plate close to the nozzle exit. It also seems to have a weak velocity dependency. This acceleration of the jet is consistent with the conservation of mass and changes in the entrainment at that region. As a direct result of the local jet acceleration, locations close to the plate present lower levels of turbulence intensity. Other factor that may contribute to this effect is the break-down of the eddies at the rigid surface. Turbulence intensity profiles have also shown a spike immediately downstream of the trailing edge. This is possibly an effect of the boundary layer separation, or a wake-type of flow originated at the trailing edge. Results for low and higher-order statistics of the shear layer opposite to the plate are exactly the same as results measured for the isolated jet configuration. Boundary layer development along the plate in both streamwise and spanwise direction is presented. It is shown that, even though the present problem consists of a non-uniform flow interacting with a surface, boundary layer properties could be defined for close-coupled, long surfaces. Finally, the spectra information from hot-wire sensors are analysed and qualitatively compared to the spectra measured by near-field surface pressure transducers located streamwise along the plate. The power spectral density of the velocity signal has a -5/3 decay, which is not seen in the pressure spectra.</p
Aerodynamics and aeroacoustics investigation of a low speed subsonic jet
No full textLow and high speed subsonic jets have been studied in the last 50 years mainly due its large application in industry, such as the discharge of turbojets and turbofan engines. The purpose of this work is to investigate the aerodynamics and the acoustic noise generated by a single stream jet flow operating at low Mach number 0.25 and Reynolds number of 2,1 105. The main focus is the flow and acoustics characterization of this low speed jet by appling different experimental techniques for evaluating the velocity field via measurements with pitot tube and hot-wire anemometry and farfield noise acquisition by free field microphones. In order to verify the validity of aeroacoustics prediction for such low speed jet, a Computational Fluid Dynamics by means of RANS simulations via k- SST model have been employed coupled with a statistically low-cost Lighthill-Ray-Tracing method in order to numerically predict the acoustic noise spectrum. Sound pressure level as a function of frequency is contructed from the experiments and compared with the noise calculations from the acoustic modeling. The numerical results for the acoustic and flow fields were well compared with the experimental data, showing that this low-cost flow-acoustic methodology can be used to predict acoustic noise of subsonic jet flows, even at low speeds
Towards estimating noise-power-distance curves for propeller powered zero emission hydrogen aircraft
No full textAs part of the UK Research and Innovation project New Aviation, Propulsion, Knowledge and Innovation Network (NAPKIN), a high-level framework was developed for the assessment of the noise impact of the proposed regional-sized hydrogen-powered aircraft. This study consists of the methodology used to generate the industry-standard noise–power–distance (NPD) curves from individual component noise analysis, specifically propeller tonal noise. The model is based on an asymptotic analysis of a frequency domain propeller tonal noise model combined with a linear approximation, taking advantage of the logarithmic nature of noise. An error analysis on the linear approximation assumption proves that the relative error between predicted and actual values of the noise remains below 10% for appropriately chosen baseline points. Verification of the framework was achieved through a bench-marking procedure that compared predictions of departure NPD curves for current technology regional aircraft against published ones over a range of operational power settings. Finally, departure and approach NPD predictions for three of the NAPKIN hydrogen concept aircraft are presented. Concepts featuring a larger, slower-rotating propeller with an increased number of blades relative to the reference aircraft showed benefits over the reference aircraft, despite, in some cases, increases in maximum takeoff weight
Chapter 09: Creating a New Way of Conducting Research and Caring for Patients in a Changing Environment
No full textIn this chapter, Dr. Dmitrovsky provides an overview of how MD Anderson must operate in the new environment of research and healthcare economics. He begins by explaining that scientific endeavors traditionally rely on decisive discoveries by individual investigators that also reveal opportunities to development treatments. Today, he says, this process moves ahead via team- and interdisciplinary science, and the institution must educate the next generations of researchers in this way of conducting research. At the same time, MD Anderson must operate in a context of a flat NIH budget while responding to the new economics of the Affordable Care Act. Next, he notes that MD Anderson is supporting the education of the next generation by making investments in junior faculty with the R. Lee Clark Fellowship Program. He explains the award (juried by experts outside of MD Anderson). Next Dr. Dmitrovsky notes that reductions are being made to the length and complexity of informed consent forms so faculty can spend less time on paperwork and more time for their primary activities. He then speaks briefly about faculty recruitment and retention efforts. Then Dr. Dmitrovsky talks about strategies used to encourage interdisciplinary investigation. He speaks in detail about finding ways to provide team members with proper recognition for their contributions (when contribution is traditionally measured by first or last author status) and linking credit to faculty promotion. He also talks about empowering team members to initiate investigations and provides some examples.https://openworks.mdanderson.org/mchv_interviewchapters/1641/thumbnail.jp
Development of diplotriaena-tricuspis (nematoda, diplotriaenoidea), a parasite of corvidae, in intermediate and definitive hosts
No full textPT: J; CR: ANDERSON RC, 1957, CANADIAN J ZOOLOGY, V35, P15 ANDERSON RC, 1957, J HELMINTHOL, V31, P203 ANDERSON RC, 1958, ANN PARASITOL HUM CO, V33, P171 ANDERSON RC, 1959, CAN J ZOOL, V37, P609 ANDERSON RC, 1959, PARASSITOLOGIA, V1, P195 ANDERSON RC, 1962, CAN J ZOOL, V40, P1175 ANDERSON RC, 1968, CAN J ZOOL, V46, P181 ANDERSON RC, 1976, CIH KEYS NEMATODE PA, P59 ANDREWS SE, 1973, 62 WILDL DIS BAIN O, 1969, ANN PARASITOLOGIE, V44, P595 BAIN O, 1973, ANN PARASITOLOGIE, V48, P81 BAKER MR, 1978, CAN J ZOOL, V56, P2127 BASHIRULLAH AKM, 1970, PAKISTAN J ZOOL, V2, P250 BRELJE NA, 1974, J EC ENTOMOL, V67, P134 CABLE RM, 1969, ILLUSTRATED LABORATO CAWTHORN RJ, 1976, CAN J ZOOL, V54, P522 CHABAUD AG, 1954, ANN PARASITOL HUM CO, V29, P42 COOPER CL, 1974, CAN J ZOOL, V52, P1421 CROFT RE, 1957, J WILDL DIS, V11, P228 DIAZUNGRIA MC, 1963, CR ACAD SCI PARASI D, V256, P4314 DUNCKER HR, 1971, ADV ANATOMY EMBRYOLO DUNN OJ, 1974, APPLIED STATISTICS A JUDD WW, 1959, CAN FIELD NAT, V73, P130 LENNETTE EH, 1974, MANUAL CLIN MICROBIO LEVINE ND, 1966, PROTOZOAN PARASITES PICKFORD R, 1969, CAN ENTOMOL, V101, P894 SHUMILO RP, 1966, PARAZITY ZHIVOTN RAS, P120 SMILLIE KW, 1969, 19 U ALB DEP COMP SC SONIN MD, 1968, ESSENTIALS NEMATODOL, V21 WELLS JJ, 1960, J PARASITOL, V46, P623; NR: 30; TC: 9; J9: CAN J ZOOL; PG: 15; GA: JH185Source type: Electronic(1
Anderson, Bailey, and Coleman
No full text(l to r) Author John Aubrey Anderson, President of the G.V. Sonny Montgomery Foundation Bob Bailey, and Dean of Libraries Frances Coleman share remarks.https://scholarsjunction.msstate.edu/libep-events-booksignings-anderson/1021/thumbnail.jp
Bailey, Coleman, and Anderson
No full text(l to r) Dean of Libraries Frances Coleman and author John Aubrey Anderson listen as President of the G.V. Sonny Montgomery Foundation Bob Bailey introduces Anderson.https://scholarsjunction.msstate.edu/libep-events-booksignings-anderson/1010/thumbnail.jp
Kurt R. Weiss
No full textDr. Kurt R. Weiss is an associate professor in the University of Pittsburgh Department of Orthopaedic Surgery, Division of Musculoskeletal Oncology. He has joint appointments in Surgical Oncology and Pathology. He serves as an Advisory Dean for the University of Pittsburgh School of Medicine and as Vice Chair of Translational Research for his Department. His research career began as an undergraduate student at Notre Dame when he worked in the Ferguson Laboratory with Dr. Christopher Evans. During medical school at Jefferson Medical College, he performed a summer research internship with Dr. Eugenie Kleinerman at the University of Texas MD Anderson Cancer Center in Houston. Between his second and third years of medical school he participated in the Howard Hughes Medical Institute/National Institutes of Health Research Scholars Program where he worked in Dr. Lee Helman’s Laboratory in the National Cancer Institute (NCI) Pediatric Oncology Branch. During residency he performed original osteosarcoma research during his lab year with Dr. Johnny Huard. After his fellowship in Musculoskeletal Oncology at the University of Toronto with Drs. Jay Wunder and Peter Ferguson, Dr. Weiss was recruited back to Pittsburgh by his Chairman, Dr. Freddie Fu, as faculty and started his own Lab.
The Musculoskeletal Oncology Laboratory (MOL) is focused on sarcoma metastatic potential. Dr. Weiss’s team of PhD collaborators, residents, medical students, undergraduate students, and technicians perform basic and translational sarcoma research experiments. Much of this work is accomplished with samples from the Musculoskeletal Oncology Tumor Registry and Tissue Bank (MOTOR) that Dr. Weiss and his clinical partners established in 2012. The MOTOR now holds over 16,000 unique samples from over 600 sarcoma patients with clinical annotation, making it one of the largest sarcoma tissue repositories in the country. This resource provides vital biological reagents for both intramural and extramural sarcoma investigators who collaborate with the MOL.
Dr. Weiss is an author on over 80 peer-reviewed publications. He recently finished his term as Research Committee Chair for the Musculoskeletal Tumor Society, the largest professional society for musculoskeletal oncology surgeons on the continent of North America. He is on the Mentorship Committee for the Connective Tissue Oncology Society, for which he has also served on the Board of Directors. He was recently named to the Scientific Steering Committee of the Sarcoma Alliance for Research through Collaboration (SARC), the largest private supporter of sarcoma clinical trials in the world. He has taught at the Orthopedic Research Society grant writing course for many years. Dr. Weiss is a regular reviewer for NCI grant applications and was on the inaugural Programmatic Panel for the Department of Defense Rare Cancers Research Program. His funding sources have included K08 and R21 awards from the NCI as well as the support of numerous foundations including the Orthopedic Research and Education Foundation and the Connective Tissue Oncology Society. Dr. Weiss is a founding member of the Pittsburgh Cure Sarcoma (PCS) patient advocacy group, as well as the Pittsburgh Sarcoma Research Collaborative (PSaRC).https://openworks.mdanderson.org/kleinermanbios/1004/thumbnail.jp
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