Strong Coulomb effects in hole-doped Heisenberg chains

Substances such as the ``telephone number compound'' Sr14Cu24O41 are intrinsically hole-doped. The involved interplay of spin and charge dynamics is a challenge for theory. In this article we propose to describe hole-doped Heisenberg spin rings by means of complete numerical diagonalization of a Heisenberg Hamiltonian that depends parametrically on hole positions and includes the screened Coulomb interaction among the holes. It is demonstrated that key observables like magnetic susceptibility, specific heat, and inelastic neutron scattering cross section depend sensitively on the dielectric constant of the screened Coulomb potential.Comment: 5 pages, 6 figures, to be published in Eur. Phys. J.

Access to Income Supports for Working Families in Chicago

A large number of eligible working families in Chicago do not participate in income support programs such as Food Stamps, the Child Care Subsidy, Medicaid, and KidCare. Participation rates in Medicaid and Food Stamps have declined since TANF reauthorization in 1996 as many former TANF recipients no longer receive the benefits they had before and to which they are still entitled. Low take-up rates for income supports mean that many low-income working families in Chicago are unable to provide the basic necessities for their families. These low rates also mean that local communities and businesses are not benefiting from the expenditures made possible by participation in income support programs. The Income Support Access Project was developed in conjunction with an initiative undertaken in 2001 by the Center for Law and Human Services (CLHS) to distribute information about income support programs to low-income participants at its Tax Counseling Project sites. Building on this initiative, the Center for Impact Research (CIR) undertook research in order to identify barriers to accessing income supports and ways to improve outreach and application support. The research involved surveying over 600 low income adults at tax service sites and job training agencies about their knowledge and experience of benefits programs. CIR also interviewed caseworkers at job training agencies as well as outreach workers and project directors. The findings and recommendations have been developed in consultation with the project working group whose members represent a range of Chicago-area community agencies and advocacy organizations

Físchlár-DiamondTouch: collaborative video searching on a table

In this paper we present the system we have developed for our participation in the annual TRECVid benchmarking activity, specically the system we have developed, Físchlár-DT, for participation in the interactive search task of TRECVid 2005. Our back-end search engine uses a combination of a text search which operates over the automatic speech recognised text, and an image search which uses low-level image features matched against video keyframes. The two novel aspects of our work are the fact that we are evaluating collaborative, team-based search among groups of users working together, and that we are using a novel touch-sensitive tabletop interface and interaction device known as the DiamondTouch to support this collaborative search. The paper summarises the backend search systems as well as presenting the interface we have developed, in detail

Aerobee 350 passes test with payload

Aerobee 350 with Nike booster launched for engineering - space science researc

Diffusion bonding of IN 718 to VM 350 grade maraging steel

Diffusion bonding studies have been conducted on IN 718, VM 350 and the dissimilar alloy couple, IN 718 to maraging steel. The experimental processing parameters critical to obtaining consistently good diffusion bonds between IN 718 and VM 350 were determined. Interrelationships between temperature, pressure and surface preparation were explored for short bending intervals under vacuum conditions. Successful joining was achieved for a range of bonding cycle temperatures, pressures and surface preparations. The strength of the weaker parent material was used as a criterion for a successful tensile test of the heat treated bond. Studies of VM-350/VM-350 couples in the as-bonded condition showed a greater yielding and failure outside the bond region

Marine recreational fisheries statistics survey for northern and central California, Quarterly Report no. 8, April to June, 1981

Field intercept Marine Recreational Fisheries Statistics Survey (MRFSS) data for central and northern California, collected in April to June 1981, is presented in a data report format. Data in this quarterly report are subdivided into three categories: primarily by five geographical areas; secondarily by fishing modes and gear types within each area; and finally by catch definition for each area, mode, and gear type. Tables are presented for these categories, each with three sections: sampled effort, ranked catch, and catch-per-unit-effort (CPUE). Also, within each area, length-frequency histograms and tables are presented for select species. (131pp.

The emergency department evaluation and outcomes of elderly fallers

BACKGROUND: Approximately one-third of community dwelling elderly people (age ≥65 years) falls each year contributing to over 2 million elderly emergency department (ED) visits for falls annually. The cost of care for fatal falls by elderly patients in the US was $179 million in 2000, and was$19 billion for non-fatal falls. The risk of falling increases with various risk factors including advancing age. Despite the frequency and costs associated with elderly falls, it is not clear what evaluation elderly fallers receive in the ED, after the ED, and the outcomes of the care provided. OBJECTIVES: We sought to examine the ED and post-ED workup of elderly fallers, and to compare this evaluation to that recommended by published ED fall evaluation and treatment guidelines. We also examined the disposition of these patients and the rate of adverse events which occurred within 1 year of discharge. METHODS: This study was a retrospective chart review of elderly ED fall patients from one urban teaching hospital with >90,000 visits per year. Patients aged ≥65 years who had an ED visit in 2012 with fall related ICD-9 codes E880-886, E888 and who had been seen by a primary care physician (PCP) within our hospital network during the past 3 years were included. We excluded patients who were transferred to our hospital and subsequent visits related to the original fall. We randomly selected 350 eligible patients for chart review. We adapted our data collection instrument from published fall evaluation recommendations including the American Geriatric Society. Categorical data were presented as percentages and continuous data were recorded as mean with standard deviation (SD) if normally distributed or medians with inter-quartile ranges (IQR) if non-normally distributed. RESULTS: A random sample of 450 charts were taken, 100 were subsequently excluded for erroneous identification. The average age was 80 (SD±9) years; 124 (35%) were male, with an average Charlson comorbidity index of 7.6 (SD 2.9). In terms of history, 251/350 (72%) took 5 or more medications, 144/350 (41%) had their visual acuity checked in the past 12 months, and 34/350 (10%) had fallen two or more times in the past 3 months. In the physical exam, only 43/350 (12%) had orthostatics done. 168/350 (48%) patients had their extremity strength recorded, of these 16/168 (10%) had decreased muscle strength. Only 128/350 (37%) patients had their gait recorded, of which 108/128 (84%) were noted to have an abnormal gait. Basic chemistry laboratory tests and hematology were sent on 199/350 (57%) of patients in the ED. X-rays were taken of 275/350 (79%) patients, and CTs were taken of 184/350 (53%) patients in the ED. 277/350 (79%) patients were discharged to their place of preadmission residence from the ED, ED observation unit, or hospital while 70/350 (20%) were discharged to a skilled rehab facility, all after being admitted to the hospital. 196/350 (56%) patients returned to the ED for any reason within 1 year of discharge, averaging 2.4 ± 1.9 visits. 161/350 (46%) patients were hospitalized within 1 year after discharge, averaging 2 ± 1.4 hospital admissions. 23 (7%) of patients died within 1 year after discharge. CONCLUSION: The comprehensive evaluation of falls for well-established risk factors and causes appears to be poor in this academic medical center ED. While results may not be generalizable to other EDs, the results suggest that standardized evaluation and treatment guidelines are needed

Factors associated with antiretroviral treatment initiation amongst HIV-positive individuals linked to care within a universal test and treat programme: early findings of the ANRS 12249 TasP trial in rural South Africa

Prompt uptake of antiretroviral treatment (ART) is essential to ensure the success of universal test and treat (UTT) strategies to prevent HIV transmission in high-prevalence settings. We describe ART initiation rates and associated factors within an ongoing UTT cluster-randomized trial in rural South Africa. HIV-positive individuals were offered immediate ART in the intervention arm vs. national guidelines recommended initiation (CD4≤350 cells/mm3) in the control arm. We used data collected up to July 2015 among the ART-eligible individuals linked to TasP clinics before January 2015. ART initiation rates at one (M1), three (M3) and six months (M6) from baseline visit were described by cluster and CD4 count strata (cells/mm3) and other eligibility criteria: ≤100; 100–200; 200–350; CD4>350 with WHO stage 3/4 or pregnancy; CD4>350 without WHO stage 3/4 or pregnancy. A Cox model accounting for covariate effect changes over time was used to assess factors associated with ART initiation. The 514 participants had a median [interquartile range] follow-up duration of 1.08 [0.69; 2.07] months until ART initiation or last visit. ART initiation rates at M1 varied substantially (36.9% in the group CD4>350 without WHO stage 3/4 or pregnancy, and 55.2–71.8% in the three groups with CD4≤350) but less at M6 (from 85.3% in the first group to 96.1–98.3% in the three other groups). Factors associated with lower ART initiation at M1 were a higher CD4 count and attending clinics with both high patient load and higher cluster HIV prevalence. After M1, having a regular partner was the only factor associated with higher likelihood of ART initiation. These findings suggest good ART uptake within a UTT setting, even among individuals with high CD4 count. However, inadequate staffing and healthcare professional practices could result in prioritizing ART initiation in patients with the lowest CD4 counts

Semimetallic molecular hydrogen at pressure above 350 GPa

According to the theoretical predictions, insulating molecular hydrogen dissociates and transforms to an atomic metal at pressures P~370-500 GPa. In another scenario, the metallization first occurs in the 250-500 GPa pressure range in molecular hydrogen through overlapping of electronic bands. The calculations are not accurate enough to predict which option is realized. Here we show that at a pressure of ~360 GPa and temperatures <200 K the hydrogen starts to conduct, and that temperature dependence of the electrical conductivity is typical of a semimetal. The conductivity, measured up to 440 GPa, increases strongly with pressure. Raman spectra, measured up to 480 GPa, indicate that hydrogen remains a molecular solid at pressures up to 440 GPa, while at higher pressures the Raman signal vanishes, likely indicating further transformation to a good molecular metal or to an atomic state

Nonlinear stability of liquid flow down an inclined plan

A modified energy method is proposed to study the nonlinear stability of Poiseuille flow with upper free boundary St, down an inclined plane. Sufficient conditions on Reynolds, and Weber numbers, on the slope of the plane, together with the periodicity along the line of maximum slope are given. All constants are computable. Smallness condition on initial data is required