Mum. Dad. Do you need some help with that? Empowering older Australians in a digital era.

The change to a digital environment for Australian families is more than simply adopting internet connectivity or a mobile phone. Moving from an analog environment and into a digital sphere for many individuals is confronting: the transition requires digital media literacy, that is an understanding of devices, forms of connectivity, installation of devices and how best to use digital connectivity to connect with other family members. In this Australian study the interviewees revealed that tensions occur between middle and older adults as both generations try to understand the effect of the change to a digital environment on each other and navigate the best path that enables communication and connection between family members. This paper will primarily draw on the interviews held with middle adult John and his mother Vera

Pathological abelian groups: a friendly example

We show that the group of bounded sequences of elements of $\mathbb{Z}[\sqrt 2]$ is an example of an abelian group with several well known, and not so well known, pathological properties. It appears to be simpler than all previously known examples for some of these properties, and at least simpler to describe for others.Comment: 6 page

Infinitely many algebras derived equivalent to a block

We give a construction that in many cases gives a simple way to construct infinite families of algebras that are not Morita equivalent, but are all derived equivalent to the same block algebra of a finite group, and apply it to some small blocks. We make some remarks relating this construction to Donovan's Conjecture and Broue's Abelian Defect Group Conjecture

Market Structure and Price Responses to Seasonal Demand Changes

The demand for gasoline follows a seasonal cycle in Sweden. The paper investigates the response in prices and profits over the cycle. In contrast to what has been found for the gasoline market in the United States I find no support for seasonal price changes compatible with the recently developed theories for cyclical variations of intensity of competition. Some possible explanations for this difference between Sweden and the United States are discussed.

The migration flux: Understanding international immigration through internal migration

This paper introduces the idea that the network structure that emerges from a foreign-born population's internal migration process changes the conditions for international immigration. The idea is tested by using data from the period between 1998 and 2008 about virtually all internal and international migration events in Spain. The findings show that internal migration changes the intensity and the quality content of immigrant social capital transfers, with both positive and negative ramifications for subsequent network-driven international migration. The effect of internal migration was particularly influential in localities with no prior direct international immigration experience. The findings also revealed a synergistic effect between the two migration processes - high levels of internal migration lead to elevated overall international immigration levels. Almost all research focusing on network-driven migration treats the causal mechanism producing the network effect in an endogenous way. For example, it is commonly claimed that increasing international immigration is the result of an expansion of the immigrant network due to past international immigration. My findings constitute explicit evidence that network-driven international migration is also determined by exogenous factors such as the second-order migration of past migrants in the destination.international; internal; domestic; migration; immigration; cumulative causation; chain migration; social networks

"Is women's non-market time more valuable than men's?"

Using interview data on preferences for changes in own and spouse’s labor supply, I find that men put a higher value on women’s non-market time than vice versa. This is the opposite of what the unitary model of the household predicts when both spouses participate in labor market work.Household models; Labor supply; Stated preferences

The Supreme Court As National School Board

A modern industrial robot control system is often only based upon measurements from the motors of the manipulator. To perform good tra-ectory tracking on the arm side of the robot a very accurate description of the system must therefore be used. In the paper a sensor fusion technique is presented to achieve good estimates of the position of the robotusing a very simple model. By using information from an accelerometer at the tool of the robot the effect of unmodelled dynamics can be measured. The estimate of the tool position can be improved to enhance accuracy. We formulate the computation of the position as a Bayesian estimation problem and propose two solutions. The first solution uses the extended Kalman fillter (EKF) as a fast but linearized estimator. The second uses the particle fillter which can solve the Bayesian estimation problem without linearizations or any Gaussian noise assumptions. Since the aim is to use the positions estimates to improve position with an iterative learning control method, no computational constraints arise. The methods are applied to experimental data from an ABB IRB1400 commercial industrialrobot and to data from a simulation of a realistic flexible robot model, showing a significant improvement in position accuracy

Factors Influencing the Propensity to Make Long Distance Trips by Rail

This paper discusses sane of the major results of the inter-urban rail trip generation models developed during the studentship of J M Rickard under the supervision of Drs C A Nash and A S Fowkes. The trip rates of distinct groups in the population are exmined and possible explanations for the differences discussed. It is found that rail business trip rates are explained by SEG, age and location - other variables such as sex and car ownership do not have an independent effect. Location in a major urban area increases use of rail for business travel by 50-100%, largely at the expense of car. For non-business travel, SEG, age, household type and whether the district has a main-line rail station are the principal determinants of rail trip rates. The highest trip rates are found for students, members of the armed forces and professional employees, particularly those aged 18-24 and living in one person or many adult households. Amongst pensioners, it is those living in 2-pensioner households who travel most: pensioners living alone make few journeys by any mode. Accessibility to a main line rail station appears to raise the use of rail by high-usage SEGs at the expense of car, but for other groups, effect is ambiguous

Stable categories and reconstruction

This work is an attempt towards a Morita theory for stable equivalences between self-injective algebras. More precisely, given two self-injective algebras A and B and an equivalence between their stable categories, consider the set S of images of simple B-modules inside the stable category of A. That set satisfies some obvious properties of Hom-spaces and it generates the stable category of A. Keep now only S and A. Can B be reconstructed ? We show how to reconstruct the graded algebra associated to the radical filtration of (an algebra Morita equivalent to) B. We also study a similar problem in the more general setting of a triangulated category T. Given a finite set S of objects satisfying Hom-properties analogous to those satisfied by the set of simple modules in the derived category of a ring and assuming that the set generates T, we construct a t-structure on T. In the case T=D^b(A) and A is a symmetric algebra, the first author has shown that there is a symmetric algebra B with an equivalence from D^b(B) to D^b(A) sending the set of simple B-modules to S. The case of a self-injective algebra leads to a slightly more general situation: there is a finite dimensional differential graded algebra B with H^i(B)=0 for i>0 and for i<<0 with the same property as above