MEASURING THE DISPERSAL OF SUBSIDIZED HOUSING IN THREE CITIES

This paper uses the Index of Dissimilarity to measure the degree of dispersal of subsidized housing between 1970 and 1980 in three cities—Chicago, Baltimore, and St. Louis. The data show that subsidized housing has been dispersed in each of the cities, in accordance with federal housing policies of the late 1960s and 1970s. There are differences among the cities, however, in the degree of dispersal and the size of the subsidized housing inventories. The data also show that subsidized housing has been extended to predominantly white census tracts and tracts with incomes higher than the city-wide median incomes. These white, higher-income tracts have lower densities of subsidized housing than poorer tracts with large black populations.     

Factors Related to Potato Mealiness

Four potato cultivars from 1984 and 1985 growing seasons were studied. Specific gravity did not correlate with potato size or shear strength, nor could it be used to predict sensory mealiness scores. Shear strength measures of the cooked potatoes showed that the Russet Burbank had a particularly strong structure at low deformations. Starches from the two more mealy cultivars, Russet Burbank and Norchip, had slightly lower gelatinization temperatures than those from the two waxy cultivars, Pontiac and LaSoda. Gelatinization temperatures were higher in potato juices than in water. Starches from the two mealy cultivars gave swelling powers between those of the two waxy cultivars, but yielded higher solubles. Pontiac potato starch exhibited anomalous behavior in its resistance to swelling and in development of viscosity in the amylograph.     

A Theory of the Early Growth of the Firm

Economic enterprise consists in the matching of resources andopportunities to create value. Growth processes of the new enterpriseare here explored in a systems model inspired by Penrose. Asequence of phases in the early life of the firm reflects growthprocesses and problems, solutions giving rise to new problems.Firms must access, mobilize and deploy resources before theycan generate resources for growth. Subsequent phases—inwhich growth reinforcement and growth reversal forces contend—arenot universal, but are set in motion in an important minorityof firms, the major job creators. Beyond the early phases, criticalproblems facing the firm are more diverse. The growth of thefirm is related to the building of the competence needed torespond to changing industrial opportunities.     

The effects of ethanol and glycerol on the body and other sensory characteristics of Riesling wines

The effect of ethanol and glycerol concentration on the body, sweetness, acidity, aroma and flavour intensity, and perceived viscosity and hotness of three Riesling wines was assessed. The ethanol and glycerol contents of the wines were adjusted by addition to give three realistic levels (5.2, 7.2, 10.2 g/L glycerol and 11.6, 12.6 and 13.6 v/v ethanol). The nine treatment combinations (3 glycerol × 3 ethanol) were rated on the above attributes by a panel of trained tasters. Increased alcohol levels resulted in increased perceived hotness in all wines, and in higher body and perceived viscosity in two of the three wines. The effect of increasing glycerol content was less consistent with only one of each of the three wines showing increased viscosity and body. However, the mean viscosity ratings given to wines with 10 g/L glycerol was higher than at 5 g/L at all alcohol levels and for all wines, suggesting that differences in glycerol concentration typically displayed between dry white table wines can affect their perceived viscosity. Neither alcohol nor glycerol consistently affected sweetness, acidity, aroma or flavour intensity. Higher ratings of the abstract term 'body' were most commonly associated with higher ratings of flavour and/or perceived viscosity, suggesting that for the majority of tasters, these two attributes contributed to their interpretation of the term 'body'. Perceived hotness was not an important component of body, while the role of acidity in body perception was taster dependent.     

The effect of Uncinula necator (powdery mildew) and Botrytis cinerea infection of grapes on the levels of haze-forming pathogenesis-related proteins in grape juice and wine

Powdery mildew on Chardonnay grapes resulted in increased levels of a grape thaumatin-like protein, VvTL2, in the free run juice compared to that from uninfected grapes. These increased levels persisted through winemaking and at the highest level of infection (> 30% of bunches infected) had a significant impact on the haziness in the wine following a heat test. Infection of Cabernet Sauvignon grapes (1–20% of bunches infected) did not affect the protein concentration of free run juice, and only traces of pathogenesis-related (PR) proteins remained detectable in the Cabernet Sauvignon wines from either infected or healthy grapes. In contrast, infection of Chardonnay or Semillon grapes by Botrytis cinerea in the vineyard resulted in decreased levels of all PR proteins in the free run juice and in a total protein extract from infected berries compared to that from uninfected grapes. Similar trends were observed when B. cinerea was grown in the laboratory on surface-sterilised berries or in filter-sterilised juice.     

CONSUMER ATTITUDES AND PERCEPTIONS TOWARDS MICROBIAL FOOD SAFETY IN THE DOMESTIC KITCHEN

The domestic kitchen is an important point of origin for foodborne disease and food safety communication strategies are required to improve food-handling behaviors in the home. A key to the design of effective strategies is an understanding of factors that influence food safety behaviors. Attitudes may influence food safety behaviors and therefore, attitude determination towards food safety in the domestic kitchen is important for development of targeted food safety communication strategies.
A questionnaire was administered to consumers (n = 100) representing a cross-section of the population of Cardiff, South Wales. Results showed that attitudes towards implementation of key food safety behaviors including cross contamination, cooking and storage were positive, however, attitudes towards other practices, for example cooling, were negative. Significant correlations (P < 0.05) between specific attitudinal responses and respondent demographics were identified, indicating that targeted strategies may be required for different groups of consumers. Results of this study will be discussed within the context of previous consumer food safety research, optimistic-bias and development of communication strategies designed to raise awareness of food safety issues and bring about behavioral improvement.     

AUTONOMOUS EXPLORATION AND CONTROL OF CHAOTIC SYSTEMS

Control algorithms that exploit chaotic behavior can vastly improve the performance of many practical and useful systems. Phase-locked loops, for example, are normally designed using linearization. The approximations thus introduced lead to lock and capture range limits. Design techniques that are equipped to exploit the real nonlinear nature of the device loosen these limitations. The program Perfect Moment is built around a collection of such techniques. Given a differential equation and two points in the system's state space, it automatically selects and maps the region of interest, chooses a set of trajectory segments from the maps, uses them to construct a composite path between the points, and causes the system to follow that path via appropriate parameter changes at the segment junctions. Rules embodying theorems and definitions from nonlinear dynamics are used to limit complexity by focusing the mapping and search on the areas of interest. Even so, these processes are computationally intensive. However, the sensitivity of a chaotic system's state-space topology to the parameters of its equations and the sensitivity of the paths of its trajectories to the initial conditions make this approach rewarding in spite of its computational demands. Controlled trajectories found by this program exhibit a variety of interesting and useful properties. For example, detours through chaotic regions can be used to steer trajectories across boundaries of basins of attraction, effectively altering both the geometry of and convergence properties within a particular convergence region, such as the capture range of a phase-locked loop circuit.     

RETHINKING THE POLITICS OF DOWNTOWN DEVELOPMENT

ABSTRACT: In the political science literature, downtown redevelopment has long been seen as the project of a region's economic elites. But in recent years, large corporations, banks, and department stores have in many cases abandoned central business districts, and downtowns are now more likely to be developed as centers of entertainment and culture, or as residential districts. This article posits that changing downtown land uses are accompanied by changes in the downtown influence structure, with nonprofit sector and real estate industry leaders now dominating downtown business organizations.     

DIVERGENCE OF STREAMLINES APPROACHING A PECTINATE INSECT ANTENNA: CONSEQUENCES FOR CHEMORECEPTION

Pectinate (feathery) antennae have high resistance to air flow, and therefore most of the air approaching an antenna is diverted around it and is not available for chemical sampling by the sensory hairs on that antenna. The small fraction (approximately 10–20%) of approaching air that passes through the air spaces or gaps in the antenna decelerates and the streamlines diverge as the air approaches the antenna. Sampling a small fraction of air that is decelerating and diverging has consequences for chemoreception that are described here for the first time. The behavior of the air is predicted from application of a fluid mechanical law: the principle of continuity. As this small fraction of air decelerates and flows through the air gaps in the antenna, it will be stretched in the plane perpendicular to the air flow. Therefore, the air may be sampled by the sensory hairs at a greater spatial resolution than expected from the distribution of the odorant molecules in the air upstream of the antenna. However, the slowing down of odorant-laden air as it passes through an antenna will not change the perceived temporal characteristics of the chemical stimulus (e.g., the rate of odorant filament encounter). This distortion or stretching of the air sample is expected to develop within about one antennal width upstream of the antenna, as verified by examining wakes of simple physical models.