OBESITY AND REPORTS OF NO LEISURE TIME ACTIVITY AMONG OLDER AMERICANS: RESULTS FROM THE THIRD NATIONAL HEALTH AND NUTRITION EXAMINATION SURVEY

Physical inactivity is a cardiovascular risk factor that has a higher prevalence among overweight adults. The purpose of this study was to assess the prevalence of not participating in Leisure Time Physical Activity (LPTA) and the relationship to body weight class among older U.S. adults. A nationally representative cross-sectional survey with an in-person interview and medical examination was used. Between 1988 and 1994, 6569 adults 60 years of age or older responded to the household adult and family questionnaires as part of the National Health and Nutrition Examination Survey III. Mexican Americans and non-Hispanic blacks were oversampled to produce reliable estimates for these groups. Overall, 39% of older U.S. adults fall in the overweight range and 23.3% are obese. Obese older adults were more likely than their overweight and healthy weight counterparts to report participating in no LTPA The prevalence of adults reporting no leisure time physical activity (LPTA) is lowest among non-Hispanic whites compared to non-Hispanic blacks and Mexican-Americans in each body mass index category. Future interventions should address strategies to promote an increase in leisure time physical activity among older adults, especially among underserved populations, and help them to prevent weight gain.     

The experiences of disabled pupils and their families

In this article, Ann Lewis, Professor of Education at the University of Birmingham, and Ian Davison, Jean Ellins, Louise Niblett, Sarah Parsons, Christopher Robertson and Jeremy Sharpe from the research team provide a summary of discussions and selected recommendations arising from four linked projects run between 2004 and 2006. The projects were funded by the Disability Rights Commission (DRC) and looked into the experiences of disabled pupils and their families across England, Scotland and Wales. A central aim of the research was to identify the key concerns and priorities in relation to their experiences of education for children and young people with special educational needs (SEN) or disabilities and their families in the UK. The research encompassed a UK-wide parent survey (N=1776); in-depth case studies of individual children and young people (N=36); group case studies (of, for example, school councils) (N=3); and a series of project advisory groups involving disabled people. Underlying these aspects was an emphasis on the importance and validity of hearing directly from (potentially all) children and young people themselves. Thus the work meshes closely with initiatives worldwide concerning the recognition of children's'voice'in matters that concern them. The authors are not aware of any comparable evidence which focuses in-depth on a wide cross-section of pupils with disabilities or special needs and their families in the UK-wide educational context and which is located alongside concurrent authoritative data concerning the views of parents and carers.     

Combining ‘subject knowledge’ with ‘how to teach’: an exploratory study of new initial teacher education for teachers of adult literacy,numeracy and English for Speakers of other Languages

This paper is based on a research project that explored a UK Government initiative to improve the quality of teaching adults, numeracy, literacy and English as a second other language. The findings will be of interest to teacher educators generally and also to those involved in teaching adults, language, literacy and numeracy. The paper reports on the main findings of the research and sets the context for the presentation of models and concepts for rethinking how to meet the diverse prior experience and qualifications of those on teacher training programmes, as well as the challenges of relating a deeper understanding of ‘what you teach’ and ‘how you teach it’. Among the many issues raised by this paper, priority is given to the importance of the sequencing and organization of teacher training courses to meet the individual needs of trainees, who in the context of teaching adults in the UK have very different levels of teaching experience, prior subject knowledge and learning needs.     

老年人的体育锻炼与身心健康

本文回顾了近十年来国外有关老年人的体育锻炼与身心健康方面的研究成果,具体讨论了老年人体育锻炼的生理心理效应,老年妇女与体育锻炼,老年人参加体育锻炼的动机以及影响老年人参加和坚持体育锻炼的因素等四个问题。     

Controlling droplet incubation using close-packed plug flow

Controlling droplet incubation is critical for droplet-based microfluidic applications; however, current techniques are either of limited precision or place strict limits on the incubation times that can be achieved. Here, we present a simple technique to control incubation time by exploiting close-packed plug flow. In contrast to other techniques, this technique is applicable to very short and very long incubation times.     

Designing Deliberation Systems

In a liberal democracy, the evolution of political agendas and formation of policy involves deliberation: serious consideration of political issues. Modern-day political participation is dependent on widespread deliberation supported by information and communication technologies, which also offer the potential to revitalize and transform citizen engagement in democracy. Although the majority of Web 2.0 systems enable these discourses to some extent, government institutions commission and manage specialized deliberation systems (information systems designed to support participative discourse) intended to promote citizen engagement. The most common examples of these are political discussion forums. Although usually considered trivial adaptations of well-known technologies, these types of deliberative systems are often unsuccessful, and present a distinct set of design and management challenges. In this article, the authors analyze the issues involved in establishing political deliberation systems under four headings: stakeholder engagement, Web platform design, service management, political process reshaping, and evaluation and improvement. We review the existing literature and present a longitudinal case study: the Norwegian Demokratitorget (Democracy Square). We define key issues in each of the four areas, which need to be understood to design and manage a successful net-based deliberation forum.     

Hybrid sliding mode observer for switched linear systems with unknown inputs

This paper addresses the state observation and unknown input estimation of a class of switched linear systems with unknown inputs. This class of systems may have modes in which the state is not fully observable. A state transformation allows implementing two suitable reduced-order observers. The first one, based on second order sliding mode techniques, is proposed to reconstruct the discrete state in the presence of unknown inputs. The second one, based on gathering partial information from individual modes of the switched system and on higher order sliding mode techniques, is introduced to estimate the continuous state. Then, the observer injection signal of the first second order sliding mode observer is used to estimate the unknown inputs. Simulation results highlight the efficiency of the proposed method.