A comparison of teaching spelling in phonetic and non-phonetic lists with the Ayer-Oberholtzer-Woody system in grade four

Thesis (Ed.M.)--Boston University, 1948. This item was digitized by the Internet Archive

Sorption of gases and vapours by zeolite RHO

Imperial Users onl

Modifications to the CLASY program

There are no author-identified significant results in this report

Solar energy applications in the Yemen Arab Republic

It is indeed seldom that a specialised subject can be considered independently. Usually it is allied to and embodied in a systematic sequence of principles, and its field is generally an integral part of a reflection of some broader conception. This is especially true of this thesis, which is concerned with the climatic environmental influences on regional architecture. In the process of evolving the passive solar aspects, theoretical considerations yielded some interesting details and solutions. Examples studied showed a great variety of design principles. Thus as the material grew it suggested an entity -a theme itself. Cont/d

Estimation of Pm-10 from vacant lands in the Las Vegas valley

According to the United States Environmental Protection Agency, the Las Vegas Valley is a serious nonattainment area for suspended particulate matter less than 10 microns in aerodynamic diameter (PM-10). The question is whether the amount of fine particulates less than 10 {dollar}\mu{dollar}m in the soil can be used to predict the amount of PM-10 entering the air stream during a wind erosion event. Over one hundred sixty soil samples were analyzed for soil particle size distribution, and a portable wind tunnel was constructed and operated in the field on fifty-two sites; The study sites covered seven of the nine major US Soil Conservation Service soil groups in the Las Vegas Valley. The Glencarb, and Land and Spring soils had the highest amount of ten micron soil particle counts. The same soil groups had the highest PM-10 emitting sites. The Data from the soil and wind tunnel analyses were used to estimate relationships between the percentage of 10 micron particles in the soil and the amount of PM-10 entraining into the wind tunnel at different wind velocities; There appeared to be relationships between the wind velocities and the amount of PM-10 emitted by each soil group, there were essentially no overall correlations between amount of 10 micron particles in the soil and the amount entering the airstream; The average flux rate at 35-40 mph was g/m{dollar}\sp2{dollar}/hour for Las Vegas Valley soils

Performance measurement of district level hospitals in low income countries: participatory development of an instrument to assess inputs, processes, and outputs for evidence-based management and quality improvement

Thesis (Dr.P.H.)--Boston UniversityBACKGROUND: The potential of hospital performance measurement (HPM) to contribute to improved quality of care and patient outcomes is underrepresented in the health system strengthening literature and no standardized HPM instrument exists for hospitals in developing countries. The problem centered Participatory Action Research (PAR) approach is particularly suited to addressing complex organizational problems in low resource settings and is gaining acceptance as an applied research method in healthcare settings. METHODS: This quasi-experimental study using the PAR approach was carried out in 4 hospitals in Cameroon. Quantitative (415 surveys) and qualitative (129 interviews and 77 observations) methods examined how participating in the design of a HPM instrument influences health personnel's knowledge, attitude, interest, and intention to continue use of performance measurement for quality improvement. Changes in scores for the above outcomes from before and after implementation of the performance indicators were compared to scores from a non-participating control hospital at the same time points. RESULTS: Personnel designed and pilot tested performance measurement indicators in all hospital services. Hospitals that actively participated in instrument design showed a statistically significant increase in HPM knowledge and attitude, and were more likely to report intention to continue using HPM as compared to the non-participating hospital. Hospital personnel participating in the design process were more aware of the workload barriers to implementing HPM but nonetheless were more motivated to continue the HPM effort. In addition, the PAR approach fostered ownership, increased skills, raised awareness of performance gaps, and led to a contextually appropriate tool. CONCLUSIONS: The results of this study demonstrate the feasibility of designing and implementing an HPM instrument in a low-resource health care system and highlight the positive benefits of the PAR approach. Further research is needed to determine the effect of regular HPM on quality of care and its sustainability over time in resource constrained settings

Certain issues in American history and their treatment in ten high school textbooks

Thesis (M.A.)--Boston University, 1948. This item was digitized by the Internet Archive

Methods of financing American industries

This item was digitized by the Internet Archive

Symmetry-protected tensor networks

The simulation and numerical study of large, strongly correlated quantum systems containing Fermions or using real-time evolution in finite dimensions is still an essentially unsolved problem, primarily due to the exponential growth of the Hilbert state space with system size and the occurrence of the so-called sign problem in Monte Carlo studies. In this area, the use of tensor-network methods, for one-dimensional systems chief among them the density matrix renormalisation group (DMRG) and matrix-product states (MPS), has grown in importance in recent years. This thesis first recapitulates the use of non-abelian symmetries such as SU(2)-Spin in arbitrary tensor networks with an extensive review of the published literature including detailed algorithms and implementation hints. Implementing such symmetries can lead to a considerably more efficient representation of states in the tensor network. This part is intended to be suitable as an implementation-oriented introduction to tensor networks in general and the implementation of non-abelian symmetries in particular. Second, it introduces a series of technical improvements for the MPS methods. These improvements include a faster convergence scheme for MPS-DMRG, a systematic approach to the construction of matrix-product operators and an improved Krylov time evolution method as well as the combination of several well-known techniques into a single tensor network toolkit, SYTEN. The effectiveness of these improvements is demonstrated in numerical examples. Third, the toolkit is applied to the study of two models of current research interest: A one-dimensional spin chain in a staggered external magnetic field is studied and confinement of the elementary spinon excitations, as predicted by analytical arguments, found numerically using real-time evolution and evaluation of the dynamical structure factor. Additionally, the Hubbard model in two dimensions is studied extensively at various system sizes, geometries, interaction strengths U and filling factors n using up to 30'000 SU(2)-Spin-symmetric states equivalent to approx. 100'000 states in other MPS-DMRG implementations. Hints of a possible phase coexistence in the region 0.85 < n < 0.95 are found at intermediate interaction strengths U = 4 and U = 6 as well as a consistently striped ground state in the region n ≈ 0.875