University of Oklahoma

About: University of Oklahoma is a education organization based out in Norman, Oklahoma, United States. It is known for research contribution in the topics: Population & Radar. The organization has 25269 authors who have published 52609 publications receiving 1821706 citations. The organization is also known as: OU & Oklahoma University.

The impacts of climate change on ecosystem structure and function

Abstract: Recent climate-change research largely confirms the impacts on US ecosystems identified in the 2009 National Climate Assessment and provides greater mechanistic understanding and geographic specificity for those impacts Pervasive climate-change impacts on ecosystems are those that affect productivity of ecosystems or their ability to process chemical elements Loss of sea ice, rapid warming, and higher organic inputs affect marine and lake productivity, while combined impacts of wildfire and insect outbreaks decrease forest productivity, mostly in the arid and semi-arid West Forests in wetter regions are more productive owing to warming Shifts in species ranges are so extensive that by 2100 they may alter biome composition across 5–20% of US land area Accelerated losses of nutrients from terrestrial ecosystems to receiving waters are caused by both winter warming and intensification of the hydrologic cycle Ecosystem feedbacks, especially those associated with release of carbon dioxide and methane rel

Theory of wire rope

Abstract: 1 Introduction.- 1.1 Basic Components.- 1.2 Identification and Construction.- 2 Equilibrium of a Thin Wire.- 2.1 Kinematics of a Thin Wire.- 2.2 Equations of Equilibrium.- 2.3 Relations Between Loads and Deformations.- 3 Static Response of a Strand.- 3.1 Geometry of a Strand.- 3.2 Axial Response of a Simple Straight Strand.- 3.3 Stress Determination of a Simple Straight Strand.- 3.4 Load Deformation Relation for a Simple Straight Strand.- 3.5 Pure Bending of a simple Straight Strand.- 3.6 Stress Determination of a Strand Subjected to Bending.- 3.7 Stress Determination of a Strand Passing over a Sheave.- 3.8 Multilayered Strands.- 3.9 Electric Conductor Strand.- 3.10 Contact Stresses.- 3.11 Outside Wires Contacting Each Other.- 3.12 Other Types of Strand Cross Sections.- 4 Static Response of a Wire Rope.- 4.1 Axial Response of an Independent Wire Rope Core.- 4.2 Axial Response of a Wire Rope.- 4.3 Stresses in a Wire Rope Due to Axial Loading.- 4.4 Stresses in a Wire Rope Due to Axial Loading and Bending.- 5 Friction in Wire Rope.- 5.1 Friction in an Axially Loaded Strand.- 5.2 Frictional Effects in the Bending and Axial Loading of a Strand.- 5.3 Frictional Effects in Wire Rope.- 5.4 Effective Length of a Broken Center Wire in a Simple Strand.- 5.5 Effective Length of a Broken Outer Wire in a Rope.- 6 Testing of a Wire Rope.- 6.1 Axial Testing of a Wire Rope.- 6.2 Effect of Rope Size on Rope Strength.- 6.3 Effect of Rope Size on Fatigue Life.- 7 Birdcaging in Wire Rope.- 7.1 Equations of Motion.- 7.2 Solution of Equations.- 7.3 Numerical Results.- 8 Rope Rotation.- 8.1 Rotation of a Wire Rope.- 8.2 Hand-Spliced Ropes.- 9 Tension and Compression of a Cord.- 9.1 Tension (contact between adjacent wires).- 9.2 Compression (no contact between adjacent wires).- 10 A Theory of Fatigue.- 10.1 Introduction.- 10.2 Theory.- 11 Remarks on Assumptions and Approximations.- 11.1 Introduction.- 11.2 Assumptions and Approximations for a Straight Strand.- 11.3 Assumptions and Approximations for a Wire Rope.- References.

Plasma Triglyceride Level and Mortality from Coronary Heart Disease

Abstract: Background Whether the plasma triglyceride level is a risk factor for coronary heart disease has been controversial, and evaluation of the triglyceride level as a risk factor is fraught with methodologic difficulties. Methods We studied the association between plasma triglyceride levels and the 12-year incidence of death from coronary heart disease in 10 North American populations participating in the Lipid Research Clinics Follow-up Study, while adjusting for the potential confounding effects of other risk factors for cardiovascular disease, including the level of high-density lipoprotein (HDL) cholesterol. All analyses were sex-specific, and separate analyses were performed in high and low strata of HDL cholesterol, low-density lipoprotein (LDL) cholesterol, fasting plasma glucose, and age. Results The rates of coronary death in both men and women increased with the triglyceride level. In Cox proportional-hazards models adjusted for age, in which the natural log of the triglyceride levels was used to gi...

Are All Dads Equal? Biology versus Marriage as a Basis for Paternal Investment

Abstract: The stepfather relationship provides a source of potential conflict in remarriage families, because the mother and partner may have different interests in the well-being of children from a prior union. Using three different theoretical perspectives—biology, sociology, and selection—this paper examines the engagement, availability, participation, and warmth of residential fathers in married biological parent, unmarried biological parent, married stepparent, and cohabiting father families. The data come from 2,531 children and their parents who were interviewed during the 1997 wave of the Child Development Supplement to the Panel Study of Income Dynamics. Biology explains less of father involvement than anticipated once differences between fathers are controlled. Marriage continues to differentiate paternal investment levels, as do age of child and financial responsibility to nonresidential children.