Quantifying urban forest structure,function, and value: the Chicago Urban Forest Climate Project

This paper is a review of research in Chicago that linked analyses of vegetation structure with forest functions and values. During 1991, the regions trees removed an estimated 5575 metric tons of air pollutants, providing air cleansing worth 9.2 million. Each year they sequester an estimated 315 800 metric tons of carbon. Increasing tree cover 10% or planting about three trees per building lot saves annual heating and cooling costs by an estimated 50 to 90 per dwelling unit because of increased shade, lower summertime air temperatures, and reduced neighborhood wind speeds once the trees mature. The net present value of the services trees provide is estimated as 402 per planted tree. The present value of long-term benefits is more than twice the present value of costs.     

Assigning volunteer tasks: The relation between task preferences and functional motives of youth volunteers

In this paper we aim to explore the relationship between volunteer motives and task preferences in order to provide volunteer managers with better insight in how tasks can be assigned to keep youth volunteers satisfied. Earlier seminal contributions have either taken a pure functional approach – where various types of motives are supposed to be at the base of any type of volunteer work – or a differentiated approach, where particular motives relate to specific task preferences. However, empirical results reported in the literature do not justify the preference of one approach above the other. To investigate whether one of the approaches is superior, or whether a combination of both is more appropriate, we perform a canonical correlation analysis for a set of functional motives and a set of task preferences (N = 2158). Five distinct relationships (canonical variate pairs) of motives and preferences are found. Results show that a ‘functional basis’ exists where all motives relate to a basic set of tasks. Additionally, a more differentiated approach towards volunteer motives and task preferences has to be taken, as we find four other relationships where specific motives are satisfied by assigning particular sets of tasks.     

Tools of the Serials Trade

Abstract

Trina Nolen reviews Rethinking Information Literacy; Elizabeth Parang, Fundamentals of Managing Reference Collections; Ann Roll reviews Building and Managing E-Book Collections; and Sarah Tusa reviews HR: A Human Resources Handbook for Academic Library Staff.     

The personalisation agenda: the case of the Australian National Disability Insurance Scheme

As part of the international trend towards personalisation, in 2013 Australia launched a major disability scheme aiming to give participants greater choice and control over services. The scheme aims to cover a wide diversity of disabilities, services and significant geographical area – resulting in a highly complex system of local overlapping markets. At four years into implementation a range of challenges have emerged. In this paper we firstly describe the Australian National Disability Insurance Scheme, then explore a range of implementation challenges it currently faces as a large-scale personalisation scheme. Based on these experiences we pose a range of questions for similar schemes internationally.     

A generalized model of logistic regression for clustered data

This paper proposes a generalized logistic regression model that can account for the correlation among responses on subunits. The subunits may arise as data on multiple observations within an individual. This method generalizes earlier work by Rosner (1984 a,b) and others. Methodological generalizations include: (1) the use of the more general Polya-Eggenberger distribution instead of the beta-binomial distribution to model the correlation structure, so that cases with negative, positive, or zero intraclass correlation can be handled; (2) a stepwise approach; (3) linear and non-linear regression; and, (4) the inclusion of the case of a truncated distribution. The model can accommodate missing data and covariates on the unit and subunit level. The derivative-free simplex algorithm is used to estimate the parameters.

The model is applied to data describing the progression of obstruction in coronary disease where multiple arterial segments are studied for each patient. The correlation in response that may exist for these multiple segments is accounted for in the analyses while attempting to examine associations with individual-specific (e.g., history of diabetes) and segment-specific (e.g., initial percent stenosis) covariates. Analyses were performed on a data set describing 382 patients with unoperated coronary artery disease and two coronary angiograms separated by at least one month and on a data set describing 284 patients undergoing percutaneous transluminal coronary angioplasty and studied by coronary angiograms.     

Safety training: An overview of current needs

Abstract

This article considers the changing nature of the demands and pressures faced by today's training practitioner. It emphasizes that safety is no longer a matter of ‘tin hats, safety guards and first aid boxes’, and explores the problems created by new legislation and rapidly changing technology. It also points up the skills required by the safety practitioner in effectively dealing with his/her organization, and the constraints placed on them by social and economic factors. The article reviews the training implications of this developing scenario.