Bacteria have transient influences on marine corrosion of steel

The contribution of bacteria to the corrosion mass loss and to pitting of mild steel was observed over 2.5 years using parallel streams of unpolluted natural (biotic) and nominally sterilized (abiotic) Pacific Ocean coastal seawater. As also observed by others, in artificial laboratory exposures, corrosion mass loss within the first few days of exposure was much greater in the biotic stream. However, after only about 10 days the difference in mass losses were gradually reduced and were very similar up to about one year of exposure. Thereafter, the corrosion loss in the biotic stream again became more severe. Pitting corrosion in the biotic stream was more severe from the very first exposure throughout the 2.5 years. Corrosion in both seawater streams exhibited three distinct but transient time-dependent phases. Of these only the first and third obviously involve bacteria. Similar longer-term observations in real seawaters have not been described previously but are generally consistent with some long-term field data. The results show that longer-term corrosion behavior and possible microbial influences cannot be predicted from short-term laboratory observations, even if natural seawater is used

Experiment at Nebraska The First Two Years of a Cluster College

In November 1968 the Board of Regents of the University of Nebraska was asked to react to a document coming from a faculty-student committee charged with examining the feasibility of establishing an innovating college on the Lincoln campus. It attempted to spell out the need for such innovation, and it offered a plan for fulfilling the need that it delineated. This is that document: 1 Within the past generation a new kind of student, a new kind of faculty, and a new kind of university have developed. To meet the challenges which these changes present and to provide for an educational and national future whose nature is unforseeable, many persons have concluded that there is a need for experiments in university curriculum and organization. The purpose of such endeavors should be a graduate who is sharply aware of himself, his society, and his world, able and desirous of continuing his liberal and professional education beyond the classroom. The New Students Students who come to the University are different from those who came twenty years ago.! A larger number of high school graduates choose to enroll than before and, of those who come, a larger number graduate. Though the numbers are greater, their quality is not inferior often. Television and other instruments of mass communication have provided them with astonishing funds of miscellaneous information, some of it inaccurate, much of it irrelevant, and part of it useful. In addition, many have traveled widely. The new students come to us with new formal preparation. High school science programs have been set up by distinguished scientists, the new math has become widespread-and public school English has undergone elaborate revision. In the future, advanced placement programs promise to change drastically the relation of entering students to the University. Perhaps more important, the temper of the undergraduates seems to be changing. The students have learned to react quickly to situations far from home ground, and echoes of Vietnam and Berkeley can be heard in Lincoln. In some universities the students have not hesitated to bite the hand that presumes to feed them, and generally students are becoming increasingly critical of their courses, professors, and colleges. They complain that universities have made them numbers on IBM cards, anonymous to teachers and advisers, and a gray mass to their administrators. They resent a lack of individual attention. For the past two years-at least responsible students through their official channels (e.g. ASUN [Associated Students of University of Nebraska]) have undertaken to scrutinize university programs. It is significant that the disgruntled students are not the weakest. The most critical are often the brightest, the most committed socially, and the most responsible morally. The best seem to be the most critical

Smooth embeddings with Stein surface images

A simple characterization is given of open subsets of a complex surface that smoothly perturb to Stein open subsets. As applications, complex 2-space C^2 contains domains of holomorphy (Stein open subsets) that are exotic R^4's, and others homotopy equivalent to the 2-sphere but cut out by smooth, compact 3-manifolds. Pseudoconvex embeddings of Brieskorn spheres and other 3-manifolds into complex surfaces are constructed, as are pseudoconcave holomorphic fillings (with disagreeing contact and boundary orientations). Pseudoconcave complex structures on Milnor fibers are found. A byproduct of this construction is a simple polynomial expression for the signature of the (p,q,npq-1) Milnor fiber. Akbulut corks in complex surfaces can always be chosen to be pseudoconvex or pseudoconcave submanifods. The main theorem is expressed via Stein handlebodies (possibly infinite), which are defined holomorphically in all dimensions by extending Stein theory to manifolds with noncompact boundary.Comment: 26 pages, 1 figure. Version 2 has minor stylistic changes for clarity, remark expanded at end of Section 4; accepted for publication by the Journal of Topolog

Charlotte Valley Central School District and Charlotte Valley Teachers Association

In the matter of the fact-finding between the Charlotte Valley Central School District, employer, and the Charlotte Valley Teachers Association, union. PERB case no. M2011-066. Before: Robert E. Flynt, fact finder

Wasserstein and Kolmogorov error bounds for variance-gamma approximation via Stein's method I

The variance-gamma (VG) distributions form a four parameter family that includes as special and limiting cases the normal, gamma and Laplace distributions. Some of the numerous applications include financial modelling and approximation on Wiener space. Recently, Stein's method has been extended to the VG distribution. However, technical difficulties have meant that bounds for distributional approximations have only been given for smooth test functions (typically requiring at least two derivatives for the test function). In this paper, which deals with symmetric variance-gamma (SVG) distributions, and a companion paper \cite{gaunt vgii}, which deals with the whole family of VG distributions, we address this issue. In this paper, we obtain new bounds for the derivatives of the solution of the SVG Stein equation, which allow for approximations to be made in the Kolmogorov and Wasserstein metrics, and also introduce a distributional transformation that is natural in the context of SVG approximation. We apply this theory to obtain Wasserstein or Kolmogorov error bounds for SVG approximation in four settings: comparison of VG and SVG distributions, SVG approximation of functionals of isonormal Gaussian processes, SVG approximation of a statistic for binary sequence comparison, and Laplace approximation of a random sum of independent mean zero random variables.Comment: 37 pages, to appear in Journal of Theoretical Probability, 2018

If An Angel Came to You

Luke 1:39-5