The public school in the news.

Thesis (Ed.M.)--Boston Universit

The public school in the news.

Thesis (Ed.M.)--Boston Universit

The ring imaging Cherenkov detector for the BRAHMS experiment at RHIC

A ring imaging Cherenkov counter, to be read out by four 100-channel PMTs, is a key element of the BRAHMS experiment. We report here the most recent results obtained tested at the BNL AGS using several radiator gases, including the heavy fluorocarbon C4F10. Ring radii were measured for different particles (pions, muons, and electrons) for momenta ranging from 2 to 12 GeV/c employing pure C4F10 as radiator.Comment: 3 pages 3 figure

Self-Reported Giving-Way Episode During a Stepping-Down Task: Case Report of a Subject With an ACL-Deficient Knee

Study Design: Case report. Objective: To describe the knee kinematics and moments of a giving-way trial of a subject with an anterior-cruciate-ligament– (ACL) deficient knee relative to his non–giving-way trials and to healthy subjects during a step-down task. Background: Episodes of giving way are believed to damage joint structures, therefore treatments aim to prevent giving-way episodes, yet few studies document giving-way events. Methods: The giving-way trial experienced by a 32-year-old male subject with ACL deficiency during a step-down task was compared to his non–giving-way trials (n = 5) and data from healthy subjects (n = 20). Position data collected at 60 Hz were combined with anthropometric data and ground reaction force data collected at 300 Hz to estimate knee displacement and 3-dimensional angles and net joint moments. Results: The knee joint displacement was higher during the giving-way trial: from 4% to 32% of stance, reaching 9.0 mm at 18% of stance as compared to 1.6 ± 0.7 mm for the non–giving-way trials. After 4% of stance, the knee flexion angle of the giving-way trial was 6.6° higher than the non–giving-way trials and was associated with a higher knee extension moment. The knee frontal plane moment was near neutral during early stance of the giving-way trial in contrast to the non-giving way and healthy subjects which demonstrated a knee abduction moment. Conclusions: The response of this subject to the giving-way event suggests that higher knee flexion angles may enhance knee stability and, in reaction to the giving-way event, that knee extension moment may increase

Rabbit Knee Joint Biomechanics: Motion Analysis and Modeling of Forces during Hopping

Although the rabbit hindlimb has been commonly used as an experimental animal model for studies of osteoarthritis, bone growth and fracture healing, the in vivo biomechanics of the rabbit knee joint have not been quantified. The purpose of this study was to investigate the kinematic and kinetic patterns during hopping of the adult rabbit, and to develop a model to estimate the joint contact force distribution between the tibial plateaus. Force platform data and three-dimensional motion analysis using infrared markers mounted on intracortical bone pins were combined to calculate the knee and ankle joint intersegmental forces and moments. A statically determinate model was developed to predict muscle, ligament and tibiofemoral joint contact forces during the stance phase of hopping. Variations in hindlimb kinematics permitted the identification of two landing patterns, that could be distinguished by variations in the magnitude of the external knee abduction moment. During hopping, the prevalence of an external abduction moment led to the prediction of higher joint contact forces passing through the lateral compartment as compared to the medial compartment of the knee joint. These results represent critical data on the in vivo biomechanics of the rabbit knee joint, which allow for comparisons to both other experimental animal models and the human knee, and may provide further insight into the relationships between mechanical loading, osteoarthritis, bone growth, and fracture healing

Self-Expression Through The String Quartet: An Analysis of Shostakovich\u27s String Quartets No. 1, No. 8, and No. 15

As a little boy, Dmitriĭ Dmitrievich Shostakovich pressed his ear against the wall to hear his neighbors play chamber music. He matured into one of the most prominent Soviet era composers. While the majority of academic interest Shostakovich centers on his symphonic works, his string quartets provide a window into a more intimate facet of Shostakovich’s life. This thesis explores first, why Shostakovich turned to the string quartet after some of the most fearful years of his life: his demise and rise after the scathing Pravda letter that all but threatened his life. Second, this thesis analyzes three of Shostakovich’s String Quartets: No. 1, No. 8, and No. 15. String Quartet No. 1, despite its simplicity, illuminates tender expressivity. Following years of intense artistic and personal scrutiny, Shostakovich sought an escape into an aural world of innocence. However, the quartet proves more complex than its surface suggests. Obscured harmonic complexities, intimate dialogue between instruments, and subtle recollection of prior movements lend the quartet a deeper meaning than its aural simplicity suggests. Decades later, amidst personal crisis, Shostakovich turned to the quartet, again. Composed in 1960, the year of his invocation into the communist party, String Quartet No. 8 demonstrates how Shostakovich utilized the string quartet as an avenue for personal self-expression. The intertwining of his musical signature with constant self-quotations and allusions confirms the deep, personal reflection the quartet provided Shostakovich. This study recounts the quotations previously uncovered by David Fanning, but goes beyond identification and relates the content of the quotations to Shostakovich’s emotional turmoil at the time of his party invocation. Finally, enduring anguishing physical pain and facing death, Shostakovich turned to the string quartet at the end of his life. String Quartet No. 15 provided Shostakovich an external outlet for his internal dialogue on death. Sentiments of meditation, fury, resistance, anguish, and resignation musically intertwine during Shostakovich’s longest and most painful string quartet. This study demonstrates how Shostakovich used the string quartet as a medium for deeper self-expression

The acceptability of certain principles of secondary education and the implications for Newfoundland education

Thesis (Ed.D.)--Boston Universit

Measurement of quasi-elastic 12C(p,2p) scattering at high momentum transfer

We measured the high-momentum quasi-elastic 12C(p,2p) reaction (at center of mass angle near 90 degrees) for 6 and 7.5 GeV/c incident protons. The three-momentum components of both final state protons were measured and the missing energy and momentum of the target proton in the nucleus were determined. The validity of the quasi-elastic picture was verified up to Fermi momenta of about 450 MeV/c, where it might be questionable. Transverse and longitudinal Fermi momentum distributions of the target proton were measured and compared to independent particle models which do not reproduce the large momentum tails. We also observed that the transverse Fermi distribution gets wider as the longitudinal component increases in the beam direction, in contrast to a simple Fermi gas model.Comment: 4 pages including 3 figure