Study program for lift fan noise reduction and suppression

V/STOL aircraft lift fan noise reduction and suppressio

Design and testing of a real time simulation for Trellis Coded Modulation

Bibliography: leaves 75-76.The aim of this project is to build and test a real time simulation for Trellis Coded Modulation(TCM). The tests to be performed are a comparison between Ungerboeck and pragmatic codes and varying and observing different Viterbi decoder parameters for coded 8PSK. TCM is coded modulation which means the choice of modulation scheme is linked with the encoding technique. Convolutional codes are important for an understanding of TCM. They are described by the rate (which is the number of inputs over the number of outputs) and the number of memory elements, v. For TCM schemes, soft decision decoding, based on euclidean distance, rather than hard decision decoding, based on hamming distance, is used. Ungerboeck developed a mapping of encoder bits to channel signals on a constellation diagram. The mapping is called mapping by set partitioning and aims to find the smallest free euclidean distance for a given code. The free euclidean distance is the minimum euclidean distance between output sequences in a code. The asymptotic coding gain is a measure of coding gain based on the free euclidean distance

Clinicoprognostic implications of increased serum levels of vascular endothelial growth factor and basic fibroblastic growth factor in early B-cell chronic lymphocytic leukaemia

To assess the relative merit of increased serum levels of vascular endothelial growth factor and basic fibroblastic growth factor in predicting the risk of disease progression of patients with early B-cell chronic lymphocytic leukaemia we analyzed 81 Binet stage A patients whose sera were taken at the time of diagnosis and evaluated for the presence of vascular endothelial growth factor and basic fibroblast growth factor using an enzyme-linked immunosorbent assay. Serum levels of vascular endothelial growth factor positively correlated with Rai sub-stages (P=0.03), peripheral blood lymphocytosis (P=0.03), bone marrow histology (P=0.04) and β2-microglobulin (β2-m) (P=0.006). When dealing with basic fibroblast growth factor only a correlation with Rai sub-stages (P=0.02) could be found. Different cut-offs set on the basis of a stratification in quartiles, failed to demonstrate any correlation between serum levels of basic fibroblast growth factor and disease progression. In contrast, patients with increased serum levels of vascular endothelial growth factor (above median value, 203 pg ml−1) had a three times increased risk of disease progression, although, in multivariate analysis only Rai sub-stages (P=0.0001) and lymphocyte doubling time (P=0.002) retained their prognostic significance. Low levels of vascular endothelial growth factor were indicative of good clinical outcome in the subgroup of patients with either low (P=0.02) or high (P=0.03) β2-m concentration. Finally, the highest prognostic power was obtained when serum vascular endothelial growth factor and β2-m were examined in combination. Median of progression-free survival of patients who had both serum vascular endothelial growth factor and β2-m higher than median value was only 13 months, in contrast median progression-free survival of patients with one marker increased (i.e. above the 50th percentile) was 40 months. Patients with both markers below the median experienced the best clinical outcome (median progression-free survival not reached at 40 months). In conclusion, serum levels of either vascular endothelial growth factor or basic fibroblast growth factor are high in patients with early chronic lymphocytic leukaemia, however, only vascular endothelial growth factor predicts behaviour of disease and helps to refine the prognosis of stage A patients

What does the future bring? A look at Technologies for Commercial Aircraft in the years 2035 to 2050

Presented on January 23, 2014, 3:30-4:30pm, Montgomery Knight Bldg. Room 442.Dr. Benzakein is currently Director of the Propulsion and Power Center at The Ohio State University (OSU). He assumed this position in July 2010 after completing a five year tenure as the Chair of the Aerospace Engineering Department at OSU. He assumed this position in early 2005 early 2005 after retiring from General Electric Aircraft Engines where he was responsible for the Research and Technology Development and New Product Creation of all commercial and military engines over the last 10 years. At General Electric, he led the research effort in Advanced Engine Systems, Computational Aerodynamics, Aeroacoustics, Aeromechanics, and Combustion as well as the development and certification of CFM56 engines for the Boeing 737 airplanes, the A320, A321, A340 and KC 135 airplane. He was also in charge of the development and certification of the GE 90 for the Boeing 777 and the CF34-10 for the Embraer 170/190 airplanes. He was responsible for building one of the strongest engineering organizations in the nation. Dr. Benzakein is currently responsible for a University Center dedicated to the research and development of new technologies focused on advanced propulsion and energy systems. He is a member of the National Academy of Engineering, a fellow at the American Institute Astronautics, a fellow of the Royal Aeronautical Society and received the Gold Medal of Honor from the Royal Aeronautical Society in 2001. He is the recipient of the 2007 AIAA Reed Aeronautics Award and has served on many National Academy, Industry, and Government advising panels over the last ten years. Additionally he received an honorary Doctorate from the University of Poitiers, France 2006 and has been elected to the Air and Space Academy, France 2012.Runtime: 58:55 minutes.Demographics and economics in the next 20 years are being examined. They reflect a significant GDP growth and with this a strong demand for commercial aircraft not only in the US and Europe but across Asia and the Middle East. The demand will focus on more fuel efficient and more environmentally friendly vehicles. Significant progress is being made with the new regionals, narrow-body, and wide-body aircraft between now and the year 2020. Looking beyond, the world will examine new airplane architectures, new changes in propulsion systems, and higher thermal and propulsion efficiencies. Distributed propulsion options will come into play. With them, higher operating pressure gas generators will be developed and great attention will have to be given to highly integrated propulsion/airplane systems. Energy transfer requirements will lead to bigger gear systems as well as new hybrid systems. The new machines are forecasted to offer improvements in fuel efficiencies of over 40%. A terrific achievement. There are many technical challenges to make all these things happen. The aerospace engineers and scientists of today and tomorrow face unlimited opportunities to make a difference for what looks like a very exciting future

La questione della guarigione nello psichismo

La guarigione nello psichismo consiste, in vero, nella ricerca di un nuovo stato mentale. Lo scopo della psicoterapia è quello di prendersi cura della sofferenza psichica. Il processo di guarigione passa attraverso la disponibilità psichica del terapeuta e attraverso i suoi 'atteggiamenti' nei confronti del paziente

Ohio State University – Institute of Aviation undergraduate and Phd student exchange

For years the Ohio State university has been engaged in international academic and research activities. The Institute of Aviation decided to join the ohio State University in this endeavor. The Institute of aviation strongly believes that in order to provide world class research and laboratory services requires world class competitiveness, which is composed of employee knowledge, accredited laboratories, certified processes, modern organization of the workplace. The Ohio State University, and in particular the Propulsion and Power Center, for years, has educated young engineers for the United States Aerospace Industries, and graduates immediately find employment with industry leaders like General Electric, Pratt & Whitney Aircraft, the Boeing Company, and others. The Institute of Aviation, in Warsaw, became also an important Ge business partner with the creation in 2000 of the Engineering Design Center. This position achieved by the Institute of Aviation brought OSU and the Institute to closer cooperation, which started with the jointly organized Polish American Conference on Science and Technology held in 2012 in olumbus, ohio and in 2013 in Washington, d.c. The Institute of Aviation has a long tradition in organizing Polish-American Conferences on Science and Technology. The first conference was held in Washington, d.c. in March 2002, organized together with the Center for Strategic and International Studies (cSIS), a famous Washington based think tank

An Update on Sizing and Performance Analysis of a Hybrid Turboelectric Regional Jet for the NASA ULI Program

Presented at AIAA/IEEE Electric Aircraft Technologies Symposium 2020Under the NASA University Leadership Initiative (ULI) program, a team of universities are collaborating on the advancement of technologies a hybrid turboelectric regional jet, with an intent to enter service in the 2030 timeframe. In the previous studies of the ULI program, the in-service benefits of the technologies under development were analyzed by integrating the technologies of interest to a 2030 regional jet with a hybrid turbo-electric distributed propulsion system. As the program has progressed, the projected performances for each technology and subsystem have been updated. This paper presents an update in the sizing and performance analysis of the regional jet with the hybrid turbo-electric distributed propulsion system, by integrating the updated values of the technologies and subsystems to the vehicle. The updates in this paper include the DC/AC conversion links, efficiency of generator and cabling losses, weight of the wires, the battery cooling through the environmental control system, motor and inverter cooling by the thermal management system, and the redundancy strategy of the propulsion system. The updates of the results from the integrated model include the overall efficiency of the propulsion system, mission fuel savings, mission energy flow distribution, and the optimal hybridization rate in climb and cruise. The overall fuel saving benefit for the target 600-nmi mission is 19.9% compared to the baseline aircraft.NASA, GR1000571

Sound Attenuation in Acoustically Treated Turbomachinery Ducts Sound Attenuation in Acoustically Treated Turbomachinery Ducts

The paper presents a theoretical development, accompanied by an experimental data check, of the attenuation in acoustically lined ducts with no airflow. The results indicate that the number of spinning lobes, as well as the generation frequency, have a major effect on the performance of the acoustic material. It also was indicated that the impedance components of the acoustic lining can be optimized to give a maximum sound energy reduction over a given range of engine speeds