Warped product approach to universe with non-smooth scale factor

In the framework of Lorentzian warped products, we study the Friedmann-Robertson-Walker cosmological model to investigate non-smooth curvatures associated with multiple discontinuities involved in the evolution of the universe. In particular we analyze non-smooth features of the spatially flat Friedmann-Robertson-Walker universe by introducing double discontinuities occurred at the radiation-matter and matter-lambda phase transitions in astrophysical phenomenology.Comment: 10 page

Relationship between frequencies of pressure oscillations and rotor speed under rotating stall

The correlation between the frequencies of pressure oscillation ωosc and the rotor speed (frequencies of rotor rotation ωRR) under established rotating stall were determined by three methods: directly from the time diagram of the oscillation process, from the behavior diagram of parameters in space and time and from frequency characteristics. In total accordance with the Theory of Nonlinear Oscillation, by all methods of analysis, the links are in the form of integer ratios: ωosc / ωRR = 1:2 (for n/ nd= 0.6, where n - rotor speed in the experiment and nd- rotor speed from data-sheet) and ωosc / ωRR = 3:7 (for n/ nd = 0.8 and 0.95). The phases of parameter oscillations in the transverse cross-section are equal to the sensor angles in compressor stator. This is in agreement with the theoretical concept of single-cell configurations of rotating stall

Orbital Selective Magnetism in the Spin-Ladder Iron Selenides Ba1−x_{1-x}Kx_{x}Fe2_2Se3_3

Here we show that the 2.80(8) {\mu}B/Fe block antiferromagnetic order of BaFe2Se3 transforms into stripe antiferromagnetic order in KFe2Se3 with a decrease in moment to 2.1(1) {\mu}B/Fe. This reduction is larger than expected from the change in electron count from Ba$^{2+}$ to K$^{+}$, and occurs with the loss of the displacements of Fe atoms from ideal positions in the ladders, as found by neutron pair distribution function analysis. Intermediate compositions remain insulating, and magnetic susceptibility measurements show a suppression of magnetic order and probable formation of a spin-glass. Together, these results imply an orbital-dependent selection of magnetic versus bonded behavior, driven by relative bandwidths and fillings.Comment: Final versio

Quantum Corrections to the Reissner-Nordstrom and Kerr-Newman Metrics: Spin 1

A previous evaluation of one-photon loop corrections to the energy-momentum tensor has been extended to particles with unit spin and speculations are presented concerning general properties of such forms.Comment: 21 pages, 1 Figur

Strategy texts as auto-communication: How narrative, language, and visual symbolism exercise discursive control

Strategy texts are an important way of communicating a strategy to a range of different stakeholders, including internal audiences as the organization communicates with itself (auto-communication). In this article, we analyze two related strategy texts that were produced for auto-communicative purposes as part of a strategic change initiative in a UK organization that employed a storytelling approach to strategic communication. Our multimodal analysis shows how narrative, visual symbolism and directive lexical choices and grammatical forms used in the two strategy texts exercise discursive control using three main mechanisms: (1) encouraging action through future-focused narrative structure; (2) strengthening emotional attachment with the organization through purposeful selection of anecdotes from a shared stock of stories; and (3) defining desired actions and behaviours through visual symbolism and directive lexical choices and grammatical forms. Moreover, the article contributes to current debates of the nature of strategic communication by demonstrating the tension between linear and dialogic communication in practice, while also providing rare empirical insights on the use of auto-communication in contemporary strategic communication

Involving older people in the design of an innovative technological system promoting active aging: the Saapho project

Active Ageing refers to the optimization process in health, social engagement, and security opportunities as people age. The demand to introduce technology to improve older people’s quality of life is progressively increasing. The objective of the SAAPHO project is to support Active Aging by assisting older people to participate in society, preserving their independence and dignity through the application of innovative Information and Communication Technologies (ICT)-based solutions. SAAPHO creates a usable system that covers health, safety and social needs of end-users taking into account their preferences in the design of the system behaviour and architecture. Questionnaires and focus groups were run during the product design early stages to guarantee this. After completing the first year prototype, controlled sessions using the SAAPHO platform were performed with older people to study its usability. This article presents the general results of older people’s participation in the design of SAAPHO system after completing the first year prototype.Peer Reviewe