Highly dispersed molybdenum oxide supported on mesoporous silica SBA-15 has been prepared by anion exchange resulting in a series of catalysts with changing Mo densities (0.2-2.5 Mo atoms nm(-2) ). X-ray absorption, UV/Vis, Raman, and IR spectroscopy indicate that doubly anchored tetrahedral dioxo MoO4 units are the major surface species at all loadings. Higher reducibility at loadings close to...

We develop a methodology for estimating time-varying alphas and factor loadings based on nonparametric techniques. We test whether conditional alphas and long-run alphas, which are averages of conditional alphas, are equal to zero and derive test statistics for the constancy of factor loadings. The tests can be performed for a single asset or jointly across portfolios. The traditional Gibbons, ...

In this article, we propose a new method for principal component analysis (PCA), whose main objective is to capture natural "blocking" structures in the variables. Further, the method, beyond selecting different variables for different components, also encourages the loadings of highly correlated variables to have the same magnitude. These two features often help in interpreting the principal c...

Dynamic loading of software components (e.g., libraries or modules) is a widely used mechanism for improved system modularity and flexibility. In general, an operating system or a runtime environment resolves the loading of a specifically named component by searching for its first occurrence in a sequence of directories determined at runtime. Correct component resolution is critical for reliabl...

By using the Flexible Least Squares (FLS) method, this study visibly shows the time variation paths of risk loadings for industrial stocks. Significant structural changes in time variation paths of risk loadings are verified by the OLS results and largely consistent with major economic and political events in the U.S. history.

Arctic sea ice thickness is thought to be an important predictor of Arctic sea ice extent. However, coupled seasonal forecast systems do not generally use sea ice thickness observations in their initialization and are therefore missing a potentially important source of additional skill. To investigate how large this source is, a set of ensemble potential predictability experiments with a global...

The United States has a growing interest in navigating the arctic waters Greenert [6]. The realities of global warming are manifesting in more navigable waters in the arctic, creating growing concerns of national security and increased interest in the economic potential of the arctic. As such, ensuring safe sea travel for vessels in harsh arctic conditions is now a primary concern. In order to ...

Dynamic loading of software components is a commonly used mechanism to achieve better flexibility and modularity in software. For an application’s runtime safety, it is important for the application to load only its intended components. However, programming mistakes may lead to failures to load a component, or even worse, to load a malicious component. Recent work has shown that these errors ar...