Diamond Intracrystalline Stable Isotope Chemical Image Analysis by Time-of-Flight Secondary Ionization Mass Spectrometery

The chemical resistance of diamond allows in-situ study of the diamond source regions. For a majority of gem quality diamonds, this source region is the sublithospheric mantle keel of a cratonic nuclei. Through analysis of stable isotopes, radiogenic isotopes and trace elements, diamond geochemical analyses can define chemical fluxes in the mantle keel. However, such studies require multiple methodologies for each chemical suite, high spatial resolution and analytical precision. Here, I evaluate Time-of-Flight Secondary Ionization Mass Spectrometer (ToF-SIMS) as an alternative method for diamond geochemical analyses. ToF-SIMS analysis can perform in cation and anion mode to measure the entire periodic table of an analyte. Establishing a quantitative ToF-SIMS methodology would dramatically increase the accessibility of diamond geochemical analyses. I determine the feasibility of developing such a ToF-SIMS diamond geochemical methodology. For ToF-SIMS to be considered a plausible method, ToF-SIMS needs to replicate established instrumentation spatial resolution and analytical precision. I determine that ToF-SIMS is able to replicate established spatial resolutions with single pixels in our element maps being \u3c 2 μm2.Through measurements of 13C and 12C, I show that ToF-SIMS is unable to replicate the analytical precision necessary for δ13C values. I conclude by establishing a framework for future ToF-SIMS studies to the end of obtaining the necessary analytical precision for quantifying isotopic variation and improved mass resolution

FRW and domain walls in higher spin gravity

We present exact solutions to Vasiliev's bosonic higher spin gravity equations in four dimensions with positive and negative cosmological constant that admit an interpretation in terms of domain walls, quasi-instantons and Friedman-Robertson-Walker (FRW) backgrounds. Their isometry algebras are infinite dimensional higher-spin extensions of spacetime isometries generated by six Killing vectors. The solutions presented are obtained by using a method of holomorphic factorization in noncommutative twistor space and gauge functions. In interpreting the solutions in terms of Fronsdal-type fields in spacetime, a field-dependent higher spin transformation is required, which is implemented at leading order. To this order, the scalar field solves Klein-Gordon equation with conformal mass in (anti) de Sitter space. We interpret the FRW solution with de Sitter asymptotics in the context of inflationary cosmology and we expect that the domain wall and FRW solutions are associated with spontaneously broken scaling symmetries in their holographic description. We observe that the factorization method provides a convenient framework for setting up a perturbation theory around the exact solutions, and we propose that the nonlinear completion of particle excitations over FRW and domain wall solutions requires black hole-like states.Comment: 63 page

Comisión económica para Europa. Grupo de trabajo de edificación del comité de la vivienda

Not available.No disponible

Subject-Package Measures to Understand the Value Provided by Journal Packages

At Minnesota State University Mankato (MNSU), we have been exploring new Key Performance Indicators (KPIs) for journal packages. Most recently, we started developing subject-package measures as a category, including as a measure of utility or as a measure of supply. Although we could previously combine filters per subject and per package, this caused us to narrow data to a single subject. Now, we can display the results for all subjects and packages as one table, which empowers us to make comparisons easily, to understand the value we gain from our packages better, and to see any subject impacts of cancellations more clearly. We only recently developed these tables, but we’d like to share them because we think they are very interesting and potentially powerful. With proper underlying data maintenance, these tables only take 10-20 minutes to make. We’ll talk about previous versions of this category of measures, the current development context, demonstrate examples, and provide tips on how to make them

Indoor environment in Dutch primary schools and health of the pupils

No summary availabl

An action principle for Vasiliev's four-dimensional higher-spin gravity

We provide Vasiliev's fully nonlinear equations of motion for bosonic gauge fields in four spacetime dimensions with an action principle. We first extend Vasiliev's original system with differential forms in degrees higher than one. We then derive the resulting duality-extended equations of motion from a variational principle based on a generalized Hamiltonian sigma-model action. The generalized Hamiltonian contains two types of interaction freedoms: One set of functions that appears in the Q-structure of the generalized curvatures of the odd forms in the duality-extended system; and another set depending on the Lagrange multipliers, encoding a generalized Poisson structure, i.e. a set of polyvector fields of ranks two or higher in target space. We find that at least one of the two sets of interaction-freedom functions must be linear in order to ensure gauge invariance. We discuss consistent truncations to the minimal Type A and B models (with only even spins), spectral flows on-shell and provide boundary conditions on fields and gauge parameters that are compatible with the variational principle and that make the duality-extended system equivalent, on shell, to Vasiliev's original system.Comment: 37 pages. References added, corrected typo

The Budget Proposal as a Constructive Collections Engagement Tool and Practice

At Minnesota State University Mankato (MNSU), our story might sound familiar. After more than a decade of flat or decreased budgets, we have cancelled hundreds of journal subscriptions and numerous journal packages. We do occasionally add journals, but only by cancelling others. We often say we are “managing library decline,” and our primary objective is to cut cleanly and accurately, so that we can continue to support accreditation and an evolving curriculum. Over the years, we have developed various tools to guide our cuts and we have demonstrated these at NASIG and elsewhere. These tools have also served for collection evaluation purposes, including accreditation, and collection outreach, to communicate the value of the library. This year we began developing a new communication tool based on the idea of a “Zero Based Budget.” Simply called the “Budget Proposal,” this tool enables the library to put forth a positive and constructive vision for the journal collections. This project has led to progress with other goals, such as the development of Key Performance Indicators (KPIs) for journals and journal packages, as well as the development of one-sheeters, or brief reports, to improve how we communicate the value provided by the library for specific programs. We will demonstrate and discuss the Budget Proposal, our KPIs, and related materials