Sustained load crack growth design data for Ti-6Al-4V titanium alloy tanks containing hydrazine

Sustained load crack growth data for Ti-6Al-4V titanium alloy in hydrazine per MIL-P-26536 and refined hydrazine are presented. Fracture mechanics data on crack growth thresholds for heat-treated forgings, aged and unaged welds, and aged and unaged heat-affected zones are reported. Fracture mechanics design curves of crack growth threshold stress intensity versus temperature are generated from 40 to 71 C

An investigation of children's peer trust across culture: is the composition of peer trust universal?

The components of children's trust in same-gender peers (trust beliefs, ascribed trustworthiness, and dyadic reciprocal trust) were examined in samples of 8- to 11-year-olds from the UK, Italy, and Japan. Trust was assessed by children's ratings of the extent to which same-gender classmates kept promises and kept secrets. Social relations analyses confirmed that children from each country showed significant: (a) actor variance demonstrating reliable individual differences in trust beliefs, (b) partner variance demonstrating reliable individual differences in ascribed trustworthiness, and (c ) relationship variance demonstrating unique relationships between interaction partners. Cultural differences in trust beliefs and ascribed trustworthiness also emerged and these differences were attributed to the tendency for children from cultures that value societal goals to share personal information with the peer group

Electron tunnel sensor technology

Researchers designed and constructed a novel electron tunnel sensor which takes advantage of the mechanical properties of micro-machined silicon. For the first time, electrostatic forces are used to control the tunnel electrode separation, thereby avoiding the thermal drift and noise problems associated with piezoelectric actuators. The entire structure is composed of micro-machined silicon single crystals, including a folded cantilever spring and a tip. The application of this sensor to the development of a sensitive accelerometer is described

Validating performance of automotive materials at high strain rate for improved crash design

This paper investigates sources of performance variability in high velocity testing of automotive crash structures. Sources of variability, or so called noise factors, present in a testing environment, arise from uncertainty in structural properties, joints, boundary conditions and measurement system. A box structure, which is representative of a crash component, is designed and fabricated from a high strength Dual Phase sheet steel. Crush tests are conducted at low and high speed. Such tests intend to validate a component model and material strain rate sensitivity data determined from high speed tensile testing. To support experimental investigations, stochastic modeling is used to investigate the effect of noise factors on crash structure performance variability, and to identify suitable performance measures to validate a component model and material strain rate sensitivity data. The results of the project will enable the measurement of more reliable strain rate sensitivity data for improved crashworthiness predictions of automotive structures

Moral reasoning of adolescent male offenders: Comparison of sexual and nonsexual offenders

This study compared the moral reasoning abilities of juvenile sex and non-sex offenders using a novel methodology that explored their responses to moral questions in a variety of offending contexts. Seven sexual and nine nonsexual adolescent male offenders from a maximum security detention facility in New South Wales, Australia, were presented with a variety of hypothetical offending situations involving sexual and non sexual offences and asked to discuss these. It was hypothesised that the quality of moral reasoning employed by offenders would be impaired in those offending contexts in which they had prior experience. Responses were assessed using a modified version of the Moral Judgment Interview Standard Issue Scoring Manual (MJI; Colby & Kohlberg, 1987). Assigned levels of moral reasoning ability were verified independently by two expert raters. Responses by sexual offenders in sexual offending contexts and by nonsexual offenders in nonsexual offending contexts were dominated by preconventional reasoning. Both groups employed a greater use of conventional reasoning in non-congruent offending contexts

Moral reasoning of adolescent male offenders: Comparison of sexual and nonsexual offenders

This study compared the moral reasoning abilities of juvenile sex and non-sex offenders using a novel methodology that explored their responses to moral questions in a variety of offending contexts. Seven sexual and nine nonsexual adolescent male offenders from a maximum security detention facility in New South Wales, Australia, were presented with a variety of hypothetical offending situations involving sexual and non sexual offences and asked to discuss these. It was hypothesised that the quality of moral reasoning employed by offenders would be impaired in those offending contexts in which they had prior experience. Responses were assessed using a modified version of the Moral Judgment Interview Standard Issue Scoring Manual (MJI; Colby & Kohlberg, 1987). Assigned levels of moral reasoning ability were verified independently by two expert raters. Responses by sexual offenders in sexual offending contexts and by nonsexual offenders in nonsexual offending contexts were dominated by preconventional reasoning. Both groups employed a greater use of conventional reasoning in non-congruent offending contexts

Resting-State Functional Connectivity in Late-Life Depression: Higher Global Connectivity and More Long Distance Connections

Functional magnetic resonance imaging recordings in the resting-state (RS) from the human brain are characterized by spontaneous low-frequency fluctuations in the blood oxygenation level dependent signal that reveal functional connectivity (FC) via their spatial synchronicity. This RS study applied network analysis to compare FC between late-life depression (LLD) patients and control subjects. Raw cross-correlation matrices (CM) for LLD were characterized by higher FC. We analyzed the small-world (SW) and modular organization of these networks consisting of 110 nodes each as well as the connectivity patterns of individual nodes of the basal ganglia. Topological network measures showed no significant differences between groups. The composition of top hubs was similar between LLD and control subjects, however in the LLD group posterior medial-parietal regions were more highly connected compared to controls. In LLD, a number of brain regions showed connections with more distant neighbors leading to an increase of the average Euclidean distance between connected regions compared to controls. In addition, right caudate nucleus connectivity was more diffuse in LLD. In summary, LLD was associated with overall increased FC strength and changes in the average distance between connected nodes, but did not lead to global changes in SW or modular organization

Attitude Determination and Launch Diagnostics for a Picosat via Kalman Filtering of Magnetometer Data

The picosat is a hockey puck sized spinning spacecraft with a two-axis ring core \u27fluxgate magnetometer. The purpose of the picosat project is to demonstrate the technologies required to take simultaneous spatially distributed measurements of fields and particles with very small spacecraft. The on-board magnetometer supports this purpose by validating the field measurement objective, and by providing attitude dynamics information for use in evaluating the launch mechanism/procedure. The paper presents methods developed for picosat attitude determination and dynamic modeling using data from the two-axis fluxgate magnetometer. Several picosat launch anomaly scenarios will be characterized to facilitate evaluation of the on-orbit performance of the launch system

Fabrication and delivery of non-destructive readout memory buffers using laminated layer technique Summary technical report

Material and processing development, magnetic storage devices, and design of memory incorporating foil storage devic