Commentary on Robert Riley's article "A personal account of the discovery of hyperbolic structures on some knot complements"

We give some background and biographical commentary on the postumous article that appears in this [journal issue | ArXiv] by Robert Riley on his part of the early history of hyperbolic structures on some compact 3-manifolds. A complete list of Riley's publications appears at the end of the article.Comment: 5 page

HIGH-RESOLUTION RECORDS OF CLIMATE CHANGE FROM LACUSTRINE STABLE ISOTOPES THROUGH THE LAST TWO MILLENNIA IN WESTERN TURKEY

Knowledge of past chmate variability is vital if the causes of observed chmate changes since instrumental records began are to be fully understood, particularly those, post-1850 AD, possibly due to anthropogenic activity. The past two millennia provide a long enough background with which to compare post-r850 AD change, whilst errors on proxy records remain relatively small. In the Eastem Mediterranean changes in water balance are of particular interest as water is an important resource. Oxygen isotope records from lakes in the region record changes in water balance and are therefore an important archive for observing natural, and anthropogenicaly forced, variabiUty in hydrology. Full understanding of cUmate proxies requires high-resolution analysis through the instramental time period for comparison with measured climate variability. Varved lake sediments provide the possibility for obtaining annually-resolvedarchives of climate proxies, andstrong chronological control through time. In this study gebchemical-climate proxies including oxygen and stable carbon isotope ratios were measured from two lakes in central Turkey with varved sediment archives. Lake Burdur's complex carbonate mineralogy and large catchment led to stable isotope data that is controlled by a variety of mischariisms and highlights the complex nature of some lake-isotope systems. A 1725 year long record was obtained from Nar GolU, with the top 900 years analysed at an annual resolution. Calibration of the top of this record with instmmental cHmate records suggests stable isotope variability at Nar is controlled by changes in evaporation, driven by changes in sunmier temperature and relative humidity. The proxy record from Nar shows sununer evaporation at Nar to be enhanced at times of increased Indian and African monsoon rainfall, and reduced during drier monsoon periods. Major shifts in the chmate system occur c. 500 and c. 1400 AD associated with times of change between relatively warm and cold periods of Northern Hemisphere temperatures. Cycles, with a frequency of 64 years, observed in the Nar isotope record and proxy records of solar activity suggest a solar forcing mechanism for decadal variability in the Eastem Mediterranean-Indian- African sununer climate system.NERC Isotope Geosciences Laboratory, Keyworth, UK; Maden Tetkik ve Arama Genel Mudiirliigu (MTA), Ankara, Turke

Local quantum critical point in the pseudogap Anderson model: finite-T dynamics and omega/T scaling

The pseudogap Anderson impurity model is a paradigm for locally critical quantum phase transitions. Within the framework of the local moment approach we study its finite-T dynamics, as embodied in the single-particle spectrum, in the vicinity of the symmetric quantum critical point (QCP) separating generalized Fermi-liquid (Kondo screened) and local moment phases. The scaling spectra in both phases, and at the QCP itself, are obtained analytically. A key result is that pure omega/T-scaling obtains at the QCP, where the Kondo resonance has just collapsed. The connection between the scaling spectra in either phase and that at the QCP is explored in detail.Comment: 12 pages, 7 figure

Functional interpretation of single cell similarity maps.

We present Vision, a tool for annotating the sources of variation in single cell RNA-seq data in an automated and scalable manner. Vision operates directly on the manifold of cell-cell similarity and employs a flexible annotation approach that can operate either with or without preconceived stratification of the cells into groups or along a continuum. We demonstrate the utility of Vision in several case studies and show that it can derive important sources of cellular variation and link them to experimental meta-data even with relatively homogeneous sets of cells. Vision produces an interactive, low latency and feature rich web-based report that can be easily shared among researchers, thus facilitating data dissemination and collaboration

Extension Must Adopt Mobile-Friendly Websites

Mobile phones and tablets have become important tools for accessing information on the Web. We have found visitors to The Almond Doctor Extension blog and AgFax.com are increasingly using smart phones and tablets rather than desktop computers. However, only 40% of Extension websites have mobile-friendly layouts, and websites that are frustrating to use on mobile devices may be a deterrent to Web traffic and use of services. Therefore, it is critical for Extension websites to develop mobile-friendly designs to increase Extension\u27s presence on the Internet and maintain its relevance to current and future clientele

Maximum Area Axis-Aligned Square Packings

Given a point set S={s_1,...s_n} in the unit square U=[0,1]^2, an anchored square packing is a set of n interior-disjoint empty squares in U such that s_i is a corner of the ith square. The reach R(S) of S is the set of points that may be covered by such a packing, that is, the union of all empty squares anchored at points in S. It is shown that area(R(S))>= 1/2 for every finite set S subset U, and this bound is the best possible. The region R(S) can be computed in O(n log n) time. Finally, we prove that finding a maximum area anchored square packing is NP-complete. This is the first hardness proof for a geometric packing problem where the size of geometric objects in the packing is unrestricted

Spectral imaging of thermal damage induced during microwave ablation in the liver

Induction of thermal damage to tissue through delivery of microwave energy is frequently applied in surgery to destroy diseased tissue such as cancer cells. Minimization of unwanted harm to healthy tissue is still achieved subjectively, and the surgeon has few tools at their disposal to monitor the spread of the induced damage. This work describes the use of optical methods to monitor the time course of changes to the tissue during delivery of microwave energy in the porcine liver. Multispectral imaging and diffuse reflectance spectroscopy are used to monitor temporal changes in optical properties in parallel with thermal imaging. The results demonstrate the ability to monitor the spatial extent of thermal damage on a whole organ, including possible secondary effects due to vascular damage. Future applications of this type of imaging may see the multispectral data used as a feedback mechanism to avoid collateral damage to critical healthy structures and to potentially verify sufficient application of energy to the diseased tissue.Comment: 4pg,6fig. Copyright 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other work

Bayes linear analysis for ordinary differential equations

Differential equation models are used in a wide variety of scientific fields to describe the behaviour of physical systems. Commonly, solutions to given systems of differential equations are not available in closed-form; in such situations, the solution to the system is generally approximated numerically. The numerical solution obtained will be systematically different from the (unknown) true solution implicitly defined by the differential equations. Even if it were known, this true solution would be an imperfect representation of the behaviour of the real physical system that it was designed to represent. A Bayesian framework is proposed which handles all sources of numerical and structural uncertainty encountered when using ordinary differential equation (ODE) models to represent real-world processes. The model is represented graphically, and the graph proves to be useful tool, both for deriving a full prior belief specification and for inferring model components given observations of the real system. A general strategy for modelling the numerical discrepancy induced through choice of a particular solver is outlined, in which the variability of the numerical discrepancy is fixed to be proportional to the length of the solver time-step and a grid-refinement strategy is used to study its structure in detail. A Bayes linear adjustment procedure is presented, which uses a junction tree derived from the originally specified directed graphical model to propagate information efficiently between model components, lessening the computational demands associated with the inference. The proposed framework is illustrated through application to two examples: a model for the trajectory of an airborne projectile moving subject to gravity and air resistance, and a model for the coupled motion of a set of ringing bells and the tower which houses them

Local Foods in the OSU RPAC

ENR 2367This is a proposal for the installation of a hydroponic system in the RPAC, with a focus on local foods.Academic Major: Environmental Scienc