Wall-thickness changes predicted in hollow-drawn tubing

Hollow-tube drawing or tube sinking theory is based on the concept of continuous distribution of dislocations. Material composition, parameter influence, and die-angle are determining factors in derivation of the theoretical model

A Catalog of Architectural Tactics for Cyber-Foraging

Mobile devices have become for many the preferred way of interacting with the Internet, social media and the enterprise. However, mobile devices still do not have the computing power or battery life that will allow them to perform effectively over long periods of time or for executing applications that require extensive communication or computation, or low latency. Cyber-foraging is a technique enabling mobile devices to extend their computing power and storage by offloading computation or data to more powerful servers located in the cloud or in single-hop proximity. This paper presents a catalog of architectural tactics for cyber-foraging that was derived from the results of a systematic literature review on architectures for cyber-foraging systems. Elements of the architectures identified in the primary studies were codified in the form of Architectural Tactics for Cyber-Foraging. These tactics will help architects extend their design reasoning towards cyber-foraging as a way to support the mobile applications of the present and the future

A Continuum Dislocation Theory Model for Predicting the Wall Thickness Changes of Hollow Drawn Tubing 1

An expression, based on some concepts of continuum dislocation theory, is developed for predicting the wall thickness changes in hollow drawn tubing. This expression predicts the observed wall thickening and thinning behavior and incorporates the parametric influences on the changes of wall thickness. TB I HE application of continuum dislocation theory to plasticity problems has been limited. The only analysis which has been treated in detail is the indentation or punch problem Two theoretical analyses, by Swift [3] and Moore and Wallace [4] have endeavored to predict the wall thickness changes of hollow drawn tubes. Particular attention was given to the increase in wall thickness observed during the early stages of the reduction sequence followed by wall thinning at the heavier reductions. Swift's theory was based entirely on "thin-wall" tubing assumptions. Moore and Wallace, however, extended Swift's analysis by including the effect of 70 on the wall thickness behavior, where 70 is defined as the ratio of the initial wall thickness to the initial outer radius. There are two facets which the Moore-Wallace theory cannot explain. Their analysis results in a differential slope solution which predicts that the wall thickness must increase during the initial stages of deformation or the reduction sequence. While their analysis was based primarily on "thin-wall" considerations, experimental evidence [2] for "thick-wall" tubes of a number of materials has shown various degrees of the wall thinning at all stages of reduction. A more general theory would have to predict both the wall thickening and thinning behavior. Secondly, the Moore-Wallace theory predicts, for an infinitely thin-wall tube (70 ^ 0) that the wall increases and then commences to thin over a reduction range of approximately 0.5. However, experimental observations on thin-wall tubes [2] suggest that thickening continues until reductions near 100 percent are attained. Both theories take into consideration the influence of die-angle and work hardening on the wall thickness changes. Experimental evidence -Nomenclature-70, 7 = initial and final ratio of wall thickness to outer radius k, t -initial and final wall thickness a 0 , a = initial and final inner radius bo, b -initial and final outer radius h, I = initial and final length a hi> a rf -dislocation density tensors £ i,ti = permutation tensor e nk -elastic strain tensor e k *,eo*, e* = plastic strain tensors coj,* = plastic rotation tensor /Co = geometry and parametric constant B = parametric constant /3 = semidie angle n = work-hardening function Journal of Basic Engineering MARCH 1 970 / 10

Real-world clinical experience in the Connect® chronic lymphocytic leukaemia registry: a prospective cohort study of 1494 patients across 199 US centres.

The clinical course of chronic lymphocytic leukaemia (CLL) is heterogeneous, and treatment options vary considerably. The Connect® CLL registry is a multicentre, prospective observational cohort study that provides a real-world perspective on the management of, and outcomes for, patients with CLL. Between 2010 and 2014, 1494 patients with CLL and that initiated therapy, were enrolled from 199 centres throughout the USA (179 community-, 17 academic-, and 3 government-based centres). Patients were grouped by line of therapy at enrolment (LOT). We describe the clinical and demographic characteristics of, and practice patterns for, patients with CLL enrolled in this treatment registry, providing patient-level observational data that represent real-world experiences in the USA. Fluorescence in situ hybridization (FISH) analyses were performed on 49·3% of patients at enrolment. The most common genetic abnormalities detected by FISH were del(13q) and trisomy 12 (45·7% and 20·8%, respectively). Differences in disease characteristics and comorbidities were observed between patients enrolled in LOT1 and combined LOT2/≥3 cohorts. Important trends observed include the infrequent use of genetic prognostic testing, and differences in patient characteristics for patients receiving chemoimmunotherapy combinations. These data represent experiences of patients with CLL in the USA, which may inform treatment decisions in everyday practice

Children's Divergent Thinking Improves When They Understand False Beliefs

This research utilized longitudinal and cross sectional methods to investigate the relation between the development of a representational theory of mind and children's growing ability to search their own minds for appropriate problem solutions. In the first experiment 59 pre-school children were given three false-belief tasks and a divergent thinking task. Those children who passed false-belief tasks produced significantly more items, as well as more original items, in response to divergent thinking questions than those children who failed. This significant association persisted even when chronological age, verbal and nonverbal general ability were partialed out. In a second study 20 children who failed the false-belief tasks in the first experiment were re-tested three months later. Again, those who now passed the false-belief tasks were significantly better at the divergent thinking task than those who continued to fail. The associations between measures of divergent thinking and understanding false-beliefs remained significant when controlling for the covariates. Earlier divergent thinking scores did not predict false-belief understanding three months later. Instead, children who passed false-belief tasks on the second measure improved significantly in relation to their own earlier performance and improved significantly more than children who continued to fail. False-belief task performance was significantly correlated to the amount of intra-individual improvement in divergent thinking even when age, verbal and nonverbal skills were partialed out. These findings suggest that developments in common underlying skills are responsible for the improvement in understanding other minds and searching one's own. Changes in representational and executive skills are discussed as potential causes for the improvement

The influence of the physical environment on self-recovery after disasters in Nepal and the Philippines

Following a disaster, the majority of families rebuild their homes themselves. In this paper, we consider how the physical environment influences such ‘self-recovery’ by investigating disasters in the Philippines (typhoons Haiyan in 2013 and Haima in 2016) and Nepal (the Gorkha earthquake - 2015). Despite the many differences in the disaster contexts, there are some common barriers to self-recovery (and building back better) in a substantially changed and dynamic multi-hazard, post-disaster environment. These are related to changes in water supply (shortage or surplus), impacts of post-disaster geohazard events on infrastructure (particularly affecting transport) and the availability of technical advice. People face a broad spectrum of challenges as they recover and tackling these ‘geo-barriers’ may help to create a more enabling environment for self-recovery. The findings point to what needs to be in place to support self-recovery in dynamic physical environments, including geoscience information and advice, and restoration of infrastructure damaged by natural hazard events. Further research is necessary to understand the issues this raises for the shelter and geoscience communities, particularly around availability of geoscience expertise, capacity and information at a local scale

A New Type of Electron Nuclear-Spin Interaction from Resistively Detected NMR in the Fractional Quantum Hall Effect Regime

Two dimensional electron gases in narrow GaAs quantum wells show huge longitudinal resistance (HLR) values at certain fractional filling factors. Applying an RF field with frequencies corresponding to the nuclear spin splittings of {69}Ga, {71}Ga and {75}As leads to a substantial decreases of the HLR establishing a novel type of resistively detected NMR. These resonances are split into four sub lines each. Neither the number of sub lines nor the size of the splitting can be explained by established interaction mechanisms.Comment: 4 pages, 3 figure

Self-recovery from disasters: an interdisciplinary perspective

This working paper presents the findings from a pilot research project that investigated how disaster-affected households in low- and middle-income countries rebuild their homes in situations where little or no support is available from humanitarian agencies. The project was an interdisciplinary collaboration involving social scientists, geoscientists, structural engineers and humanitarian practitioners. The work was broad in scope. It investigated households’ self-recovery trajectories and the wide range of technical, environmental, institutional and socioeconomic factors influencing them over time. It also considered how safer construction practices can be more effectively integrated into humanitarian shelter responses