AN EXPERIMENTAL INVESTIGATION OF THE GROWTH OF SMALL CORNER FATIGUE CRACKS IN ALUMINIUM 6061-T651

Results of an experimental investigation of the fatigue growth of small corner cracks emanating from small flaws are presented. Growth-arrest behaviour was observed, and increases in crack length during growth periods were of the order of the transverse grain size. For the test material, the corner crack front intersects, on average, only three–six grains in the small crack regime monitored, so only a small number of constrained, interior grains is encountered. It is suggested that the presence of partially constrained surface grains may contribute to the 'anomalous' growth behaviour which has been observed by a number of investigators.
The crack growth histories of the test data presented exhibit considerable scatter. It is shown that a Student's t -test can be used to estimate confidence intervals in order to provide a measure of the observed scatter. The variation in confidence intervals in the transition from small to long fatigue crack growth is discussed.     

Uptake of energy efficiency interventions in English dwellings

Little detailed evidence has previously been available regarding the uptake rate or prevalence of energy efficiency interventions among specific household groups. This study uses the Home Energy Efficiency Database (HEED) to investigate both the combination of measures that have been installed, and in which dwellings, according to key neighbourhood socio-demographic variables, including income and tenure. Analysis of 2000–07 data indicates that approximately 40% (9.3 million) dwellings in England had approximately 23.7 million efficiency measures installed, with an average of 2.5 measures per dwelling. Building fabric-related measures were the most frequent (e.g. cavity wall insulation, loft insulation and glazing) with an average of 2.1 million installed each year. Dwellings with the highest number of fabric interventions (the top 20%) were more likely to be found in areas with low income, with more owner-occupied dwellings, experiencing lower winter temperatures, having a lower proportion of flats, and having a slightly higher proportion of older adults and children. Energy efficiency installations have tended to occur among specific types of households or parts of the building stock. These findings have implications for the design of future government programmes for targeting energy efficiency measures to specific household groups or dwelling types.     

Comparing true and false confessions among persons with serious mental illness.

Over the past decade, knowledge on false confessions has grown tremendously. However, a similar knowledge base on true confessions has not. In the present study, independent, self-reported true and false confession experiences of persons with serious mental illness were compared. In addition to examining the crimes and police questioning that led to the true or false confession, we investigated the reasons behind the confessions and the eventual case outcomes. We found that, in comparison to true confessors (n = 30), false confessors (n = 35) were questioned more times, took longer to confess, perceived the evidence against them to be weaker, and reported significantly more external pressure and less internal pressure. Moreover, of those participants who were convicted, false confessors were four times more likely to receive a prison sentence than true confessors. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Generalised cube-based dynamic element matching algorithms fordigital to analogue converters

Dynamic element matching (DEM) digital to analogue converters (DACs) often use interconnection networks to implement their DEM algorithms. A hardware implementation of a generalised cube network (GCN) DEM DAC algorithm is described, and this implementation is shown to be more hardware efficient than other GCN-based DEM algorithms when used in DEM DACs with less than six bits     

Energy and urban built form: an empirical and statistical approach

The geometrical forms of buildings have important effects on their use of energy. These relationships are explored at the scale of the entire non-domestic building stock of London. A three-dimensional digital model of the city is used to make a series of geometrical measures: building volume, exposed surface area (walls plus roof) and plan depth. These are compared with figures for the consumption of gas and electricity published by the UK Department of Energy and Climate Change (DECC). The comparisons are made at different levels of spatial aggregation, from boroughs to census districts. Strong correlations are demonstrated between exposed surface area and both gas and electricity use. The analysis also provides some evidence of a sharp increase in electricity use in districts with buildings whose depth in plan exceeds 14 m (in which air-conditioning and permanent artificial lighting are typically required). A multiple regression model is used to measure the contribution of these effects to total energy use, as compared with floor area, activities and number of employees.     

Violent storms and violent people: How meteorology can inform risk communication in mental health law.

Meteorology is often thought of as a field with highly developed techniques for forecasting rare and severe events. Risk assessment of another type of rare and severe event—violence to others—occurs in mental health law. The analogy between these 2 forms of risk assessment is explored in this article. How meteorologists go about assessing the risk of harmful weather is described. Implications from the meteorological analogy are drawn for 1 aspect of violence prediction that is routinely ignored in mental health law: the communication of risk "forecasts." (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

DREAMS OF THE MALE CHILD: AN EEG STUDY.

32 6-12 YR. OLD BOYS WERE AWAKENED A TOTAL OF 249 TIMES DURING EPISODES OF REM SLEEP. SOME ITEM OF SUBSTANTIVE MENTAL CONTENT WAS REPORTED ON 72% OF THESE AWAKENINGS, A PERCENTAGE OF DREAM RECALL ONLY SLIGHTLY LOWER THAN THAT COMMONLY OBSERVED WITH ADULTS. REPORTED DREAMS WERE PREDOMINANTLY "GOOD" OR AFFECTIVELY NEUTRAL, AND THEIR MANIFEST CONTENT OFTEN DEALT IN A RELATIVELY DIRECT MANNER WITH MAJOR FOCI OF JUVENILE AND PREADOLESCENT SOCIAL ADJUSTMENT: PARENTS, SIBLINGS, MALE PEERS, RECREATIONAL OR PLAY SETTINGS AND ACTIVITIES. THE FREQUENCY OF FRIENDLY OR APPROACH SOCIAL THEMES INCREASED WITH AGE, BUT UNFRIENDLY OR ESCAPE SOCIAL THEMES WERE MORE PROMINENT AMONG THE YOUNGER BOYS. PRESLEEP VIEWING OF AN AGGRESSIVE FILM STIMULUS APPEARED TO REDUCE DREAM INTENSITY IN GENERAL AND HOSTILE-UNPLEASANT CONTENT IN PARTICULAR. (18 REF.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)