OBJECTIVES To use PERISTAT data on indicators of maternal mortality and morbidity to explore maternal health outcomes in Europe, and to discuss the implications of variations in the data sources for these indicators. STUDY DESIGN The PERISTAT feasibility study provides the source for this descriptive study, covering 15 European countries. Maternal mortality ratios are calculated, and data to ...

We propose a framework for modelling and solving search problems using logic, and describe a project whose goal is to produce practically effective, general purpose tools for representing and solving search problems based on this framework. The mathematical foundation lies in the areas of finite model theory and descriptive complexity, which provide us with many classical results, as well as po...

Irene Schena Department of Computer Science, University of Bologna Via di Mura Anteo Zamboni 7 40127 Bologna, Italy email [email protected] web http://www.cs.unibo.it/~schena ABSTRACT An important part of the descriptive power of mathematics derives from its ability to represent formal concepts in a highly evolved, twodimensional system of symbolic notations. Tools for the mechanisation of mat...

The aim of this paper is to carried out statistical analysis for optimization of various concrete mix proportions by using full factorial experimental technique. The variables such as 28 days cube compressive strength, water to cement ratio (w/c), coarse aggregate to total aggregate ratio (CA/TA) and total aggregate to cement ratio (TA/C) were the parameters to be used for optimization. Four w/...

To solve an instance of the constraint satisfaction problem (CSP) one has to findan assignment of values to variables that satisfies given constraints. This thesisconcerns two different extensions of the constraint satisfaction problem.The first extension allows for an infinite number of constraints in an instance.It is phrased in the language of sets with atoms, which provides ...

Human infants appear to be capable of the rudimentary mathematical operations of addition, subtraction, and ordering. To determine whether infants are capable of extracting ratios, we presented 6-month-old infants with multiple examples of a single ratio. After repeated presentations of this ratio, the infants were presented with new examples of a new ratio, as well as new examples of the previ...

BACKGROUND In epidemiological studies researchers use logistic regression as an analytical tool to study the association of a binary outcome to a set of possible exposures. METHODS Using a simulation study we illustrate how the analytically derived bias of odds ratios modelling in logistic regression varies as a function of the sample size. RESULTS Logistic regression overestimates odds rat...

the bias against mangrove areas in siting fish farms prompted a comparison of the cost structure and yield performance in upland and mangrove locations. tools utilized included descriptive statistics, budgetary and cash flow analyses and profitability ratios. empirical results revealed that substantial revenue could be realized from both farms. while the upland farms yielded average gross reven...

This study assessed the effect of the carbon/nitrogen (C/N) ratio on the hydrogen production from sucrose-based synthetic wastewater in upflow fixed-bed anaerobic reactors. C/N ratios of 40, 90, 140, and 190 (g C/g N) were studied using sucrose and urea as the carbon and nitrogen sources, respectively. An optimum hydrogen yield of 3.5 mol H2 mol-1 sucrose was obtained for a C/N ratio of 137 by ...

Abstract: A technique is described which enables quantitative histological data to be recovered from conventional digital images. Methodology is developed around the concept of image ratios, which are shown to be invariant to scene geometry and illumination intensity. Key to the success of this technique, is a function which maps uniquely from a vector if image ratios to the corresponding vecto...