Ultrafast Angle-Resolved Photoemission Spectroscopy of Quantum Materials

Techniques in time- and angle-resolved photoemission spectroscopy have facilitated a number of recent advances in the study of quantum materials. We review developments in this field related to the study of incoherent nonequilibrium electron dynamics, the analysis of interactions between electrons and collective excitations, the exploration of dressed-state physics, and the illumination of unoccupied band structure. Future prospects are also discussed.Comment: 7 pages, 6 figure

The effects upon short-term memory of acoustic interference and the cognitive separation of a reduntant element

Sperling (1963) noted that some subjects (Ss) stated they could hear material being held in short-term storage, and he suggested that short_term memory (STM) for verbal materials may be in the form of an auditory loop. The first major laboratory investigations of this topic were made by Conrad (1962;1964) who examined the errors made in immediate recall, and found that substitution errors tend to involve units that sound alike (acoustically-similar), even when the original stimuli were visual. He concluded that visual letters are recorded into auditory representations, which may subsequently be confused with one author. The auditory, or at least linguistic characters of immediate memory has been impressively documented in a series of studies by Wickelgren, who demonstrated that phonetically similar letters impair recall in botch a retroactive (1965a) and a proactive (1966a) design. Intralist inhibition also appeared in a study (1965b) which found a high error rate in lists composed of letters that sound somewhat alike. Auditory similarity even affected STM when a method of recognition was employed, so that the subject need only say whether a particular test letter or was not present in a preceding series (Wickelgren, 1965c; 1966b). These studies represent an explicit link between speech perception and immediate memory. The confusions among similar sounding letters cannot be ascribed to errors made in hearing them originally, since Wickelgren\u27s Ss always began by copying the stimulus as it was presented

Milneburg, New Orleans: An Anthropological History of a Troubled Neighborhood

For nearly 200 years, there has been a neighborhood in New Orleans, Louisiana named Milneburg, which has been constantly reimagined by its inhabitants and others. From its inception as a port of entry in 1832 until the 2011, it has been called a world-class resort, the poor-man\u27s Riviera, a seedy red-light district, a cradle of jazz, a village, a swath of suburbia and a neighborhood. It has been destroyed eight times due to storms, fires, and civic or governmental neglect. Each time its residents have rebuilt it. In its last iteration as a post-Katrina neighborhood, the residents reestablished the Milneburg Neighborhood Association in order to define its boundaries, gain control of its redevelopment and restrict who lived there as well as what activities were permitted. This is a case study of the trajectory of Milneburg and the cultural adaptations of its residents to keep it distinct, vital and respectable

Milneburg, New Orleans: An Anthropological History of a Troubled Neighborhood

For nearly 200 years, there has been a neighborhood in New Orleans, Louisiana named Milneburg, which has been constantly reimagined by its inhabitants and others. From its inception as a port of entry in 1832 until the 2011, it has been called a world-class resort, the poor-man\u27s Riviera, a seedy red-light district, a cradle of jazz, a village, a swath of suburbia and a neighborhood. It has been destroyed eight times due to storms, fires, and civic or governmental neglect. Each time its residents have rebuilt it. In its last iteration as a post-Katrina neighborhood, the residents reestablished the Milneburg Neighborhood Association in order to define its boundaries, gain control of its redevelopment and restrict who lived there as well as what activities were permitted. This is a case study of the trajectory of Milneburg and the cultural adaptations of its residents to keep it distinct, vital and respectable

Deformation Studies of Tungsten-Gold Contacts at the Nanometer Scale.

The deformation behavior of atomically clean, nanometer sized tungsten / gold contacts was studied at room temperature in ultra-high vacuum. An instrument that combines atomic force microscopy (AFM), scanning tunneling microscopy (STM), and field ion microscopy (FIM) into a single experimental apparatus was designed, constructed, and calibrated. A cross-hair force sensor having a spring constant of - 442 N/m was developed and its motion was monitored during indentation experiments with a differential interferometer. Tungsten tips of controlled size (12.8 nm \u3c tip radius \u3c 2 1.6 nm) were first shaped and characterized using FIM and then indented into a Au (1 10) single crystal to depths ranging from 1.5 nrn to 18 nm using the force sensor. Continuum mechanics models were found to be valid in predicting elastic deformation during initial contact and plastic zone depths despite our small size regime. Multiple discrete yielding events lasting \u3c 1.5 ms were observed during the plastic deformation regime; at the yield points a maximum value for the principal shear stress was measured to be 5 + 1 GPa. During tip withdrawal, pop-out events relating to material relaxation within the contact were observed. Adhesion between the tip and sample led to experimental signatures that suggest neck formation prior to the break of contact. STM images of indentation holes revealed various shapes that can be attributed to the (1 1 1 ) (1 10) crystallographic slip system in gold. FIM images of the tip after indentation showed no evidence of tip damag

WIC AND THE RETAIL PRICE OF INFANT FORMULA

Rebates from infant formula manufacturers to State agencies that administer the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) support over one-quarter of all WIC participants. However, concerns have been raised that WIC and its infant formula rebate program may significantly affect the infant formula prices faced by non-WIC consumers. This report presents findings from the most comprehensive national study of infant formula prices at the retail level. For a given set of wholesale prices, WIC and its infant formula rebate program resulted in modest increases in the supermarket price of infant formula, especially in States with a high percentage of WIC formula-fed infants. However, lower priced infant formulas are available to non-WIC consumers in most areas of the country, and the number of these lower priced alternatives is increasing over time.WIC program, infant formula, cost-containment, rebates, food package costs, Special Supplemental Nutrition Program for Women, Infants, and Children, child nutrition, food assistance, Food Security and Poverty,

Consumer preference for exterior egg shell characteristics

This publication is a report on Department of Agricultural Economics Research Project 382. 'The Relation of Egg Quality Criteria to Consumer Acceptability of Eggs'--P. [2].Digitized 2007 AES.Includes bibliographical references (page 32)

Water in opal – what can it tell us?

Opal is a hydrous silica composed of predominantly silicon dioxide and water. The chemical composition of opal is normally described by the general formula SiO2.nH2O. The formula indicates that opal contains water and the value of ‘n’ is variable so the water content is variable and is known to range widely. Such a simple formula hides much of the important characteristics of how water is contained in opal and the variability in the water content and states of water is intricately involved in the formation of opal and may influence properties of the opal as a gemstone. The understanding of the states of water in opal is therefore of importance. The way in which the water is contained provides clues to the mechanisms of formation of opal. The water contained may also be used as a probe to help elucidate the complex microstructure beyond the sphere array structure in which precious opal, in particular, is described. This article will outline the types of water present in opal that displays play-of colour (POC) and how these types have been determined using chemical and physical laboratory characterisation techniques