Determining the relationship between students' scores using traditional homework assignments to those who used assignments on a non-traditional interactive CD with tutor helps

Tinney, Charles Evan Utah State University 2007 해외박사(DDOD)

By using the book "Physics for Scientists and Engineers" by Raymond A. Serway as a guide, CD problem sets for teaching a calculus-based physics course were developed, programmed, and evaluated for homework assignments during the 2003-2004 academic year at Utah State University. These CD sets were used to replace the traditionally handwritten and submitted homework sets. They included a research-based format that guided the students through problem-solving techniques using responseactivated helps and suggestions. The CD contents were designed to help the student improve his/her physics problem-solving skills. The analyzed score results showed a direct correlation between the scores obtained on the homework and the students' time spent per problem, as well as the number of helps used per problem.

Low-dimensional techniques for sound source identification in high speed jets

Tinney, Charles E Syracuse University 2005 해외박사(DDOD)

The most energetic modes of the turbulent mixing layer from an axisymmetric jet at Mach 0.85 are examined using multi-component forms of the joint POD-Fourier decomposition techniques. Measurements of the velocity field (r, theta cross-plane) are performed using a stereo PIV system traversed along the sound-source regions of the, flow ( zD = 3 to 8, Deltaz = 0.25D). The results indicated a dominance in the m = 5 Fourier-azimuthal mode at z = 3D, with a shift to the m = 3 Fourier-azimuthal mode at z = 8D. A grid sensitivity indicates that the inclusion of additional components in the decomposition are not shown to shift the energy amongst modes, but rather change the relative energy in each mode, thus supporting previous investigations by Citriniti & George [97], Jung et al. [103], and Glauser & George [99] who used the scalar decomposition (streamwise component) in the axisymmetric mixing layer (incompressible) and Ukeiley et al . [58] who used a vector form (streamwise and radial component) in the compressible Mach 0.30 & 0.60 axisymmetric jet. By employing a cross-spectral-based modified form of Bonnet et al.'s [54] Complementary Techniques, a dynamical estimate of the sound-source events are realized. This low-dimensional first-order estimate used the pressure signatures from the jet's near-lip region as the unconditional events because of their high bandwidth capabilities, (sampled at 30kHz) in order to overcome low sampling speeds with conventional PIV systems. More importantly, the application of this technique is shown to greatly reduce, if not eliminate, the intrusiveness on the acoustic characteristics of the sound-source events. The near-field pressure region was investigated using a variety of dynamic pressure transducers situated at several spatial locations outside of the turbulent shear-layer region near the jet's lip. An LDV system was traversed along several positions in the potential core and turbulent regions of the jet's flow and was sampled simultaneously with the pressure transducers. It was discovered that the ability to capture pressure signatures capable of correlating with the jet's velocity field (via LDV) was sensitive to radial, streamwise and azimuthal locations. Peak correlations were found as high as 25% when the LDV's measurement volume was situated at zD ≈ 4. The convective speeds of the large-scale events ranged between 0.75Ucl in the potential core at Mach 0.6 and 0.85, and 0.65Ucl along the center of the mixing layer at Mach 0.60. No acoustic feedback mechanisms were found between the turbulent events and the near field pressure. Future investigations will use this low-dimensional model to evaluate the modal evolution of the Lighthill source terms in order to estimate the far-field noise, and will be compared to a simultaneous survey (already performed) of the acoustic far-field regions. From this model, we expect to determine the key signature events at the jet lip that are responsible, in an evolutionary sense, for the more energetic sources of noise. Eventual applications of these exciting findings will extract the necessary information for controlling these signature events in order to reduce their radiated noise.

Using Specially Designed Academic Instruction in English (SDAIE) online as a guide for designing cross-cultural learning experiences

Tinney, Mari Vawn Utah State University 2007 해외박사(DDOD)

This study explored the benefits of applying Specially Designed Academic Instruction in English (SDAIE) to an online environment. The primary research question for this study was: "In what ways can the same benefits of a low-risk and safe environment in a face-to-face SDAIE course design be realized in an online course design?" The research involved a related research question: What does implementation look like in an online English and a second language (ESL) learning environment when designers add three SDAIE design subcomponents that have been shown to create a low-risk and safe environment? These strategies or subcomponents include: (a) providing guides and learning companions, (b) building scaffolding for a low affective filter, and (c) starting with short overview and technical training lessons on using typical online lesson components and navigating the system. An actual SDAIE online course was designed, developed, and instantiated with a specific focus of using the SDAIE components of low-risk and a safe environment for seven Hispanic and Latino bilingual learners. This online course, "Communicating in North America," was uploaded to a professional hosting website. The instructor for this SDAIE online course was also the investigator of this study who closely monitored and collected data on each participant during a 5-week period. The findings are reported from participant responses given during a formative evaluation through observations, lesson documents, questionnaire results, and interview statements taken before, during, and after the implementation phase of this study. Data from the study are presented in tables, participant narratives, and investigator comments. Their favorable response to the SDAIE methods and strategies suggest that these learners received similar or some of the same benefits while participating in this SDAIE online design instance as they would in a SDAIE face-to-face course as it was implemented with the three subcomponents that contributed to a low-risk and safe environment. This dissertation includes specific guidelines for other instructional designers to aid them in becoming more culturally responsive in their design efforts or to apply SDAIE components to their online and classroom lessons.

A measurement of the cosmic microwave background polarization with the south pole telescope

Crites, Abigail Tinney The University of Chicago 2013 해외박사(DDOD)

We present maps of the cosmic microwave background (CMB) polarization at 90 and 150 GHz measured with SPTpol and the first EE and TE CMB power spectrum measurements from SPTpol. We also describe the SPTpol instrument in detail. We discuss the development of the SPTpol camera including the cryogenic design and the transition edge sensor (TES) detectors developed at NIST and Argonne National Laboratory. The goals of the SPTpol project are to exploit the high resolution of the telescope (1 arcminute beam) and the high sensitivity afforded by the 1536 detector camera to measure the E-mode power spectrum of the CMB, characterize the B-mode polarization induced by the gravitational lensing of the primordial E-mode CMB polarization, and to detector set an upper limit on the level of the B-mode polarization from inflationary gravitational waves. This thesis is a first step toward accomplishing these goals. Measuring the E-mode power spectrum will allow us to improve constraints on parameters of the current cosmological models that are sensitive to the damping tail of the CMB.