Thesis advisor: Theresa A. O'Keefe / Thesis (STL) — Boston College, 2016. / Submitted to: Boston College. School of Theology and Ministry. / Discipline: Sacred Theology.

Student Number : 0413336G - MSc(Eng)dissertation - School of Chemical and Metallurgical Engineering - Faculty of Engineering and the Built Environment / This dissertation reports systematic work aimed at determining the plastic deformation mechanisms that led to strains at fracture as high as 4.7% in WC-Co alloys at 1000°C when subjected to 3-point bending tests. The three grades investigated have a Co content of 15wt% and WC grain sizes of 1.3, 0.35 and 0.3 μ m respectively and were received after they were tested in bending. Fractography, macrostructural and microstructural investigations were carried out in attempts to identify the mechanisms leading to the large strains. Techniques used included light microscopy, scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS) and quantitative image analysis. Through comparisons of the results from the three grades at various temperatures, it was possible to establish that the large strain at 1000°C are mainly due to cracking and cobalt drift. During the fractographic investigations it was found that the grades which contained VC as a grain refiner exhibited steps on the WC grains and that fracture propagated preferentially along the stepped WC grain boundaries.

Thesis (Ed.D.)--Boston University / PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you. / There are a variety of theories in the field of education used to describe student success. Erikson's psychosocial theory is the examination of the interaction between genetic predispositions and environmental contexts, namely society and culture. Behavioral theory is used to understand human behavior in regards to the functional relationship between individuals' responses and environment events that shape them. These theories are not mutually exclusive, but they may be combined to explain how and why students succeed in certain domains and develop the skills necessary to make effective progress in other less supportive environments. The researcher investigated the experiences of 14 students before, during, and after attending an assigned alternative program. Interview and document analysis revealed eight key factors contributed to students' ability to reintegrate from an assigned alternative program back to their traditional high school setting. These factors are (a) a small learning environment separate from the traditional high school, (b) consistency of staff and routines, (c) close deliberate relationships, (d) motivation for reintegration , (e) the availability of therapeutic services, (f) high expectations for skill development, (g) positive student growth and improved performance, (h) and the existence of a home base with in the traditional high school. The results of this study determined that, although these factors originated in the alternative program, they needed to be re inforced in the traditional high school setting in order to ensure continued progress for each student. Human development and behavior, whether viewed through a psychosocial or behavioral perspective, clearly reveal that the interventions offered through the Empower program enable students to develop into healthy, autonomous, young adults. Through the Empower program experience, the students studied internalized the skills required to control their emotions and behavior. Skill development enabled them to return to the traditional high school setting, and, for most, to continue on to a post high school education. / 2031-01-01

A variant of the recombination model which we call the valon-parton model is applied simultaneously to a variety of meson inclusive reactions with proton, pion and kaon beams in the kinematic region of low transverse momentum and intermediate values of longitudinal momentum fractions. It is found that the valon distributions in hadrons show no evidence for SU(3) breaking. There are some indications of substantial gluon dissociation contributions which we interpreted through a maximally enhanced sea. For proton induced reactions the model predictions are in excellent agreement with the data; meson initiated reactions indicate additional contributions are coming from resonances which are produced recombinantly and then decay into the observed mesons. / Source: Dissertation Abstracts International, Volume: 42-10, Section: B, page: 4097. / Thesis (Ph.D.)--The Florida State University, 1981.

A calculation of the nonsinglet longitudinal coefficient function of deep-inelastic scattering through order-g('4) is presented, using the operator-product expansion and the renormalization group. Both ultraviolet and infrared divergences are regulated with dimensional regularization. The renormalization scheme dependence of the result is discussed along with its phenomenological application in the determination of R = (sigma)(,L)/(sigma)(,T). / Source: Dissertation Abstracts International, Volume: 43-09, Section: B, page: 2940. / Thesis (Ph.D.)--The Florida State University, 1982.

The reaction K('-)p(--->)K('+)(,slow)X('-) was studied for (XI)* production using Brookhaven National Laboratory's Multi-Particle Spectrometer. The slow transverse K('+) was identified by two brass/scintillator detectors that detected the stopping K('+) and its subsequent decay. The reaction takes place via baryon exchange. The system in recoil to the K('+) has strangeness -2. The mass of the X('-) was determined as a missing mass for about 3400 events. Of the eleven previously reported (XI) states, two are well established, two are in need of clarification, and the rest need confirmation. In this experiment no new resonances were found, but six previously reported (XI) states were observed: (XI)(1320), (XI)(1530), (XI)(1820), (XI)(2020), (XI)(2220), and the (XI)(2350). Two body cross sections were measured for these states and they range from 1.25 to 7.25 (mu)b. Other previously reported states were not observed up to the 1 (mu)b level and they are: (XI)(1630), (XI)(1680), (XI)(1940), and the (XI)(2120). No conclusions were drawn on the (XI)(2500). / Source: Dissertation Abstracts International, Volume: 43-10, Section: B, page: 3276. / Thesis (Ph.D.)--The Florida State University, 1982.

Quantum gravity suffers from the non-renormalizability and the unboundedness of the Einstein action. Non-perturbative methods may be crucial for an understanding. The lattice has become an important tool in probing the non-perturbative structure of field theories and could provide valuable hints in understanding quantum gravity as well. / Regge calculus has been used to make preliminary non-perturbative, numerical investigations of the theory. First simulations revealed the existence of an entropy dominated phase, where expectation values of physical quantities were stable. As a first step towards a more realistic theory, we couple a SU(2) field to gravity on the Regge skeleton to see whether the entropy dominated phase would allow the hadronic masses to be chosen arbitrarily small compared to the Planck mass and simultaneously allow the space to become flat on the hadronic scale. / We observe the existence of an entropy dominated phase in simulations on a 4$\sp3 \cdot 2$ lattice and study the phase diagram. The Polyakov loop is used as the order parameter and shows hysteresis, indicating a phase transition. However, to provide modest evidence for the scenario outlined above would require simulations on a larger system $(8\sp3 \cdot\ 4)$, currently outside the scope of our computing resources. / Source: Dissertation Abstracts International, Volume: 54-07, Section: B, page: 3676. / Major Professor: Bernd A. Berg. / Thesis (Ph.D.)--The Florida State University, 1993.

Symmetry breaking and the question of the origin of mass are the reasons the Superconducting Super Collider and the Large Hadron Collider are being built. The Standard Model of particle physics provides a solution to this problem by proposing the existence of a neutral scalar particle, the Higgs boson. This particle, via its interactions, gives mass to all of the particles in the Standard Model. The question of whether the Higgs boson can be detected at these machines depends critically on its final state decays. These decays in turn depend crucially on the mass of the Higgs boson, an unknown parameter of the theory. A lower bound of the Higgs mass has been set by experiment and a upper bound via theoretical arguments. Throughout much of the mass range Higgs decays via weak gauge bosons yield a clear signal. However, near the lower limit, the so-called intermediate mass region, the situation is less clear. In this region Higgs decays into photon pairs have been suggested as a viable signal. The significance of such a signal depends on other competing processes or backgrounds. This dissertation attempts to answer the question, "Can the Intermediate mass Higgs boson be detected via its electromagnetic decays?" To answer this question various Standard Model processes are calculated to the leading-log and next-to-leading-log level in a Monte Carlo environment. / Source: Dissertation Abstracts International, Volume: 54-03, Section: B, page: 1456. / Major Professor: Joseph F. Owens, III. / Thesis (Ph.D.)--The Florida State University, 1993.

In order to accurately describe the cutoff dependence of the Higgs mass triviality bound, the $\varphi\sp4$ theory is formulated on an $F\sb4$ lattice which preserves Lorentz invariance to a higher degree than the commonly used hypercubic lattice. / We solve this model non-perturbatively by evaluating the linked cluster expansion through 12th order following the approach of Luscher and Weisz. The results are continued across the transition line into the broken phase by integrating the perturbative renormalization group equations. In the Goldstone phase, the renormalized coupling never exceeds 2/3 of the tree level unitarity bound when $\Lambda$/$m\sb{R}\ge 2$. Our results confirm recent Monte Carlo data and we obtain as an upper bound for the Higgs mass $m\sb{R}$/$f\sb\pi=2.45(7)$ at $\Lambda$/$m\sb{R}=2$. / Attempting to produce a heavier Higgs on the lattice, additional four-derivative terms are introduced in the naive action which serve to parameterize the leading order cutoff effects. Using a cluster reflection algorithm of the Swendsen-Wang-Wolff type, we simulate this action on an $F\sb4$ lattice in a region where the region where the effects of the new terms are expected to be maximal. As an upper bound we now obtain $M\sb\sigma$/$f\sb\pi\approx 2.8$, an increase of about 20% compared to the simplest non-linear action. Despite triviality, the scalar sector may thus not be weakly interacting. / Source: Dissertation Abstracts International, Volume: 53-11, Section: B, page: 5775. / Major Professors: Urs M. Heller; Dennis W. Duke. / Thesis (Ph.D.)--The Florida State University, 1992.

Two and four prong (pi)('+)p interactions at 16 GeV/c were used to study the reactions: (pi)('+)p (--->) p(pi)('+)(pi)('+)(pi)('-)(eta), (pi)('+)p (--->) p(pi)('+)(eta) and (pi)('+)p (--->) p(pi)('+)(omega). The data were taken by the SLAC 1 meter hybrid bubble chamber facility augmented with a lead glass wall assembly for forward going neutral energy detection. The wall was used to trigger the bubble chamber for neutral energy greater than 3 GeV. / The detection of the (eta) and (pi)('0) signals is shown in the neutral missing mass of the 2 and 4 prongs. A strong (DELTA)('++) signal is seen in both 2 and 4 prong topologies. The invariant mass for the (eta)(pi)('+),(eta)(pi)('-),(eta)(pi)('+)(pi)('-),(pi)('+)(pi)('-)(pi)('0) and (omega)(pi)('+) are given but no new high mass resonances were found. / The cross section for (pi)('+)p (--->) (pi)('+)(pi)('+)(pi)('-)p(eta), (eta) (--->) neutrals production was calculated to be 72 (+OR-) 20 (mu)b, while for the (pi)('+)p (--->) (pi)('+)p(eta), (eta) (--->) neutrals it was 31 (+OR-) 8 (mu)b. The cross section for the production of the (pi)('+)p (--->) (pi)('+)p(omega) was 45 (+OR-) 8 (mu)b and (pi)('+)p (--->) (DELTA)('++)(omega) was found to be 16 (+OR-) 2 (mu)b. / Signals were observed and cross sections calculated for the following mesonic resonances: (delta)('(+OR-))(980) (--->) (eta)(pi)('(+OR-)):(sigma) (.) BR = 13 (+OR-) 5 (mu)b, (eta)' (--->) (eta)(pi)('+)(pi)('-):(sigma) (.) BR = 8 (+OR-) 3 (mu)b and B('+)(1235) (--->) (omega)(pi)('+):(sigma) = 11 (+OR-) 2 (mu)b. Cross sections for resonances opposite (DELTA)('++) were found: (eta)'(980):(sigma) = 6 (+OR-) 1.8 (mu)b and D('0)(1285):(sigma) = 4 (+OR-) 1 (mu)b. / Source: Dissertation Abstracts International, Volume: 45-01, Section: B, page: 0235. / Thesis (Ph.D.)--The Florida State University, 1984.