Social capital and coping with economic shocks

"South African households live in an environment characterized by risks, and many face a significant probability of experiencing economic losses that threaten their daily subsistence. Using household panel data that include directly solicited information on economic shocks and employing household fixed-effects estimation, we explore how well households cope with shocks by examining the effects of shocks on child nutritional status. Unlike in the idealized village community, some households appear unable to insure against risk, particularly when others in their communities simultaneously suffer large losses. Households in communities with more social capital, however, seem better able to weather shocks." from Authors' Abstract

Thomas-forbidden particle capture

At high energies, in particle-capture processes between ions and atoms, classical kinematic requirements show that generally double collision Thomas processes dominate. However, for certain mass-ratios these processes are kinematically forbidden. This paper explores the possibility of capture for such processes by triple or higher order collision processes.Comment: 34 pages and three figure

Distributional patterns in Boston public housing

Thesis (M.A.)--Boston UniversityPublic housing has been built largely as a response to the spread of slums in American cities. The origins and growth of slums in different sections of Boston have been caused by several factors. The North and West Ends, originally the most exclusive districts in the city, declined as upper and middle-class residents moved outwards toward the periphery of Boston and beyond into the surrounding towns. The exodus of the upper classes from Central Boston was stimulated by the arrival of European immigrant laborers and by extensions and improvements in public transportation, especially after the middle of the 18th Century. Af first settling in the North and West Ends and in the South Cove, immigrants soon moved into Charlestown, East Boston, the South End and South Boston, attracted by the shipping, factory, and warehouse employment in these areas. Further improvements in public transportation and reduced fares facilitated the migration of low-income families (mainly composed of immigrants) to other outlying sections of Boston; Roxbury, Dorchester and Brighton. Also important as a blighting influence was the elevated railway in Charlestown, the South End and Roxbury. In the West and South Ends and in Roxbury, many cheaply-constructed tenements were built. In 1891, the first city-wide census of housing conditions was made. A wide distribution of slum conditions existed; the North and South Ends and South Boston contained the highest percentages of unsanitary tenements, Charlestown and the built-up sections of East Boston and Roxbury had deteriorated and conditions below the city average were found even in Brighton, Dorchester and West Roxbury. During the first quarter of the present century, many lower-quality frame three-deckers were built in Dorchester, East Boston, Roxbury and South Boston. In studies undertaken by the City Planning Board in 1934 and 1935, physical housing characteristics were compiled, proposed public housing project sites were studied and the relative income and cost of different sections of the city were analyzed. The slums were found to be a heavy economic liability to the city. Although limited as a measurement of blight, 1950 U. S. Census of Housing figures, available by blocks, are the only recent data for the whole city. Boston's first public housing project was Old Harbor Village, built in 1938 under the Federal Government P. W. A. program. This project was built on an essentially vacant site in South Boston and most of the original tenants came from nearby substandard housing areas in South Boston and northern Dorchester. Zoning changes, designed as a protection from harmful land uses, were made in this area and several stores and a church have been attracted by the project. The three programs under which public housing has been built in Boston are; (1) Federally-aided for low-income families, (2) State-aided for low-income veterans and (3) City-State, sold to private individuals five years after construction. The U. S. Housing Acts of 1937 and 1949 that for all Federally-aided public housing units constructed, an equal number of slum dwellings be eliminated. The earliest projects were slum clearance projects located near downtown Boston. The State-aided and City-State legislations, passed soon after World War II, did not require slum clearance because of an acute housing shortage. Many of these, as well as some Federally-aided projects were built on vacant sites. In some cases, due to the lack of available vacant land in Boston and under the pressure of the housing shortage, vacant site projects were located on poorer quality land. City-owned land and private estates were sought for a number of housing projects in order that delays in assembling and clearing several parcels of land could be avoided. Of the several aspects of public housing distribution considered in this study, a sharp contrast between slum clearance and vacant site projects has been evident in respect to services; schools, public transportation and retail shopping. The lack of service availability has been most noticeable in projects located at the city is periphery; Orient Heights, Columbia Point and Fairmount. Both the Orient Heights and Fairmount projects have been primarily responsible for the recent construction of nearby elementary schools and the new Columbia Point School, built for the exclusive use of children from the Columbia Point Project, is not large enough. Another public school will be required for this project. Again, extensions of public transportation service have been necessary largely because of these three projects, and in the case of Columbia Point, a bus route was initiated solely for the project occupants. On the other hand, all slum clearance projects are well-served by public traasportation, in many instances by the surface and elevated routes that have strongly contributed to slum growth. Few stores, except for supermarkets, have been attracted by public housing projects. Only three stores have located adjacent to Columbia Point, the largest project in the city. The supermarket that serves Columbia Point is approximately 1400 feet from the project boundary and was built primarily for drive-in trade from Morrissey Boulevard. The most widely distributed store types within convenient walking distance from housing projects (taken as 600 feet) are grocery stores, drug stores and eating places. The most frequent store types within this distance are grocery stores, eating places and drinking places. A high percentage (up to 50 per cent in the case of the South St. Project) of the stores around several projects are vacant. Most of these vacancies are the result of overestimation of local markets, including housing projects, depopulation and successful competition of supermarkets. The percentage of registered Democratic voters in precincts containing housing projects is higher than the average for the city. In 1956, 85 per cent of all registered voters in Boston were Democrats; in housing projects approximately 95 per cent of the number of voters that could be determined were Democrats. In one ward, Ward IV, a slight Republican majority was changed to a slight Democratic majority primarily due to voters living in the Mission Hill Extension Project. Many projects, especially slum clearance projects, are not sufficiently protected by zoning restrictions from present and future intrusion of adjacent land uses harmful to the environment of the projects. Although most of the zoning changes and variances requested by the Boston Housing Authority have been granted, zoning restrictions have prevented the construction of several proposed vacant site housing projects. The location of a number of existing vacant site projects has depended on zoning changes. The proportion of younger people (under 21 years) is higher in public housing projects than in the city as a whole. Also high is the percentage of broken homes, often headed by females. Population density has even been increased over previously high densities in several slum clearance projects, especially the South End Project. This reflects expensive site acquisition in the slums. The assessed values of individual projects are extremely variable and there are no apparent factors accounting for the discrepancies. The per-dwelling-unit assessment in some projects is more than ten times that of others. The total effect of housing project construction in Boston has been to stabilize the centrifugal movement of population, since the median average distance of public housing dwelling units from the center of the city is approximately the same as all dwelling units in the city. The center of gravity of public housing distribution in the city has moved 1 1/2 miles to the southwest during the period 1940 to 1954, towards the largest amounts of vacant land. Formerly within a severely blighted area in the South End, the center is now located in Roxbury, south of the city's highest slum concentrations. The proportion of public housing to total housing is approximately 6 per cent in Boston, higher than in most other American cities. Most of the larger multi-family projects in the city are Federally-aided, while the smaller City-State temporary public housing projects usually consisted of two- and one-family houses. Except for the North and West Ends, projects have been well-distributed throughout the city. High land costs prevented the construction of projects in these two areas. The only probable construction of additional public housing in the city will be for low-income elderly individuals. As this would be a State-aided program, slum clearance would not be required and projects would be built on vacant sites. Eventually, public housing may also be built for low-income minority groups, perhaps Negroes. If built under a Federally-aided program, substandard housing sections in Roxbury or Dorchester would probably be chosen for sites. These are the areas of most recent Negro settlement in Boston and lower land values would permit slum clearance at a reasonable cost. Experimental forms of Federally-aided public housing in other parts of the country are small one- to four-faffiily projects on dispersed sites and the renovation of slum housing for use as public housing. Spreading slums and land scarcity would favor the latter approach to future public housing in Boston

Ocular rotations and the Hirschberg test

The Hirschberg test is an objective means of determining the angle of strabismus by noting the distance the corneal reflex of a light source is from the center of the entrance pupil. A scale factor is used in converting the amount the reflex distance is in millimeters to prism diopters. Recent studies have demonstrated this factor to be 22 prism diopters for each millimeter. This study notes how axial length would effect this scale factor. Using ultrasound axial lengths of thirty eyes were measured and compared to the results of a Hirschberg simulation. A small effect results from this comparison. The mean values of scale factor determination noted twenty-three prism diopters per millimeter

LABOR STRIKES AND THE PRICE OF LETTUCE

This paper examines the economic impact of the 1979 labor strike against lettuce producer-shippers in the Imperial Valley of California. The theory presented suggests that formidable problems are encountered by agricultural labor unions in obtaining higher wages for farm workers. During the 1979 strike, ironically the returns to many of the lettuce producers in the Imperial Valley increased substantially.Demand and Price Analysis, Labor and Human Capital,

Simple Calculations to Reduce Litigation Costs in Personal Injury Cases: Additional Empirical Support for the Offset Rule

This article demonstrates that if the nominal rate of interest equals the growth rate of nominal earnings, then a strong case can be made for calculating lump-sum damage awards by using the offset rule, i.e., by simply multiplying the annual loss by the number of years the loss is expected to continue. An examination of the Canadian data not only supports the offset rule, but also suggests that plaintiffs are being systematically undercompensated by rules currently in use

Limnological, Ichthyological, and Parasitological Investigations on Arkansas Reservoris in Relation to Water Quality

Lake Fort Smith, a 525 acre (212 ha) reservoir, was impounded in 1936 as a water supply for the city of Fort Smith. The reservoir is located on Clear Creek (Frog Bayou), a tributary of the Arkansas River, in the Boston Mountains 28 miles (45 km) northeast of the city of Fort Smith in Crawford County, Arkansas. A map and morphometric characteristics of Lake Fort Smith are given in Fig. 1 and Table I (Hoffman, 1951; Nelson, 1952). In 1956 Lake Shepherd Springs, a 750 acre (304 ha) impoundment, was created one mile upstream of Lake Fort Smith (Rorie, 1961). Both lakes have a shale substrate and are subject to periods of high turbidity. The 2 two lakes have a water shed of 65 square mile area (168 km ) of mountainous oak-hickory forest. Lake Shepherd Springs has not acted as a settling basin for sediments; thus, the upper portion of Lake Fort Smith has numerous shallow areas with a mud bottom supporting various submergent and emergent aquatic plants. The lower portion of the lake has a rocky, shale substrate with only limited emergent vegetation

Partial Response to Platinum Doublets in Refractory EGFR-Positive Non-Small Cell Lung Cancer Patients after RRx-001: Evidence of Episensitization.

RRx-001, an experimental systemically non-toxic epi-immunotherapeutic agent, which potentiates the resensitization of resistant cancer cells to formerly effective therapies, is under active investigation in several clinical trials that are based on sequential or concomitant rechallenge to resistant first- or second-line regimens. One of these trials is designated TRIPLE THREAT (NCT02489903), because it explores the conditioning or priming effect of RRx-001 on three tumor types - non-small cell lung cancer (NSCLC), small cell lung cancer and high-grade neuroendocrine tumors - prior to re-administration of platinum doublets. In follow-up to a recent case study, which describes early monotherapeutic benefit with RRx-001 in a refractory EGFR-mutated NSCLC tumor, we present subsequent evidence of a radiological partial response to reintroduced platinum doublets after RRx-001. For the 50% of patients with EGFR-mutated NSCLC who progress on EGFR-tyrosine kinase inhibitors (without evidence of a T790M mutations) as well as platinum doublets and pemetrexed/taxane, no other clinically established treatment options exist. A retrial of these therapies in EGFR-positive NSCLC patients via priming with epigenetic agents such as RRx-001 constitutes a strategy to 'episensitize' tumors (i.e. reverse resistance by epigenetic means) and to extend overall survival

The Origin of the Brightest Cluster Galaxies

Most clusters and groups of galaxies contain a giant elliptical galaxy in their centres which far outshines and outweighs normal ellipticals. The origin of these brightest cluster galaxies is intimately related to the collapse and formation of the cluster. Using an N-body simulation of a cluster of galaxies in a hierarchical cosmological model, we show that galaxy merging naturally produces a massive, central galaxy with surface brightness and velocity dispersion profiles similar to observed BCG's. To enhance the resolution of the simulation, 100 dark halos at $z=2$ are replaced with self-consistent disk+bulge+halo galaxy models following a Tully-Fisher relation using 100000 particles for the 20 largest galaxies and 10000 particles for the remaining ones. This technique allows us to analyze the stellar and dark matter components independently. The central galaxy forms through the merger of several massive galaxies along a filament early in the cluster's history. Galactic cannibalism of smaller galaxies through dynamical friction over a Hubble time only accounts for a small fraction of the accreted mass. The galaxy is a flattened, triaxial object whose long axis aligns with the primordial filament and the long axis of the cluster galaxy distribution agreeing with observed trends for galaxy-cluster alignment.Comment: Revised and accepted in ApJ, 25 pages, 10 figures, online version available at http://www.cita.utoronto.ca/~dubinski/bcg

Gas-phase Electronic Spectra of Coronene and Corannulene Cations

The effects of age on neophobia and exploration are best described in birds and primates, and broader comparisons require reports from other taxa. Here we present data showing age-dependent exploration in a long-lived social species, the common vampire bat (Desmodus rotundus). A previous study found that vampire bats regurgitated food to partners trapped in a cage. Interestingly, while only a few adult bats visited the trapped bat, in every trial all or most of the eight young males in the colony would visit the trapped bat without feeding it. To test whether this behavioral difference resulted from age class differences in exploration, we compared responses of the bats to a trapped conspecific versus an inanimate novel object. Some adults and young showed interest in trapped conspecifics, but only the young males explored the novel objects. Additional novel object tests in a second captive colony showed that higher rates of novel object exploration were shown by young of both sexes. Our results corroborate past findings from other mammals and birds that age predicts exploration. If age-dependent exploration is indeed adaptive, then the role of age as a predictor of exploration tendency should depend on species-specific life history traits. Finally, because younger vampire bats also appear to have higher exposure to pathogens such as rabies virus, there may be implications for pathogen transmission if younger and more exploratory vampire bats are more likely to feed on novel hosts