Classical Robustness of Quantum Unravellings

We introduce three measures which quantify the degree to which quantum systems possess the robustness exhibited by classical systems when subjected to continuous observation. Using these we show that for a fixed environmental interaction the level of robustness depends on the measurement strategy, or unravelling, and that no single strategy is maximally robust in all ways.Comment: 8 Pages, 2 figures, Version 2. Minor changes to wording for clarification and some references added. Accepted for publication in Europhysics Letter

Computational Design of Chemical Nanosensors: Metal Doped Carbon Nanotubes

We use computational screening to systematically investigate the use of transition metal doped carbon nanotubes for chemical gas sensing. For a set of relevant target molecules (CO, NH3, H2S) and the main components of air (N2, O2, H2O), we calculate the binding energy and change in conductance upon adsorption on a metal atom occupying a vacancy of a (6,6) carbon nanotube. Based on these descriptors, we identify the most promising dopant candidates for detection of a given target molecule. From the fractional coverage of the metal sites in thermal equilibrium with air, we estimate the change in the nanotube resistance per doping site as a function of the target molecule concentration assuming charge transport in the diffusive regime. Our analysis points to Ni-doped nanotubes as candidates for CO sensors working under typical atmospheric conditions

Teaching Higher Education Courses in Further Education Colleges

It can be comprehended that the models and theories which are currently used to reinforce teaching depict the education practices of transmitting knowledge from teacher to students, which is more traditional, linear, input-output construction of teaching that has dominated adult education for decades including the last half century. As numerous studies (e.g. QAA, 2018) emphasizes that both the needs of learner and learning in enterprise and entrepreneurship education (EEE) context is different from other disciplines and mainstream higher education (HE). This requires further development of teaching methods and practices that can encourage the aspirations of the learner in this particular education setting. When investigating the theories and approaches that are used to examine teaching in HE, the relevance and adequacy of them to review teaching practices in this 21st century and EEE context is a question. Thus, the need of new theoretical models and frameworks can be clearly observed. For example, to investigate teacher’s role in EEE setting, there is a need of adopting more context specific, individual-focused research methods. When the recent outcomes associated with the UK higher education are taken into account, there is an emerging key debate; i.e. are universities actually turning off potential entrepreneurs. Whether these outcomes are due to teaching, learning environment or other activities within universities, is still largely a question, hence requires further research to find answers

Molecular Dynamics Simulation of Polymer-Metal Bonds

Molecular simulation is becoming a very powerful tool for studying dynamic phenomena in materials. The simulation yields information about interaction at length and time scales unattainable by experimental measurements and unpredictable by continuum theories. This is especially meaningful when referring to bonding between a polymer and a metal substrate. A very important characteristic of polymers is that their physical properties do not rely on the detailed chemical structure of the molecular chains but only on their flexibility, and accordingly they will be able to adopt different conformations. In this paper, a molecular simulation of the bonding between vinyl ester polymer and steel is presented. Four different polymers with increasing chain lengths have been studied. Atomic co-ordinates are adjusted in order to reduce the molecular energy. Conformational changes in the macromolecules have been followed to obtain the polymer pair correlation function. Radius of gyration and end-to-end distance distributions of the individual chains have been used as a quantitative measurement of their flexibility. There exists a correlation between flexibility of the molecular chains and the energy of adhesion between the polymer and the metal substrate. Close contacts between the two materials are established at certain points but every atom up to a certain distance from the interface contributes to the total value of the adhesion energy of the system

Thermodynamically consistent description of the hydrodynamics of free surfaces covered by insoluble surfactants of high concentration

In this paper we propose several models that describe the dynamics of liquid films which are covered by a high concentration layer of insoluble surfactant. First, we briefly review the 'classical' hydrodynamic form of the coupled evolution equations for the film height and surfactant concentration that are well established for small concentrations. Then we re-formulate the basic model as a gradient dynamics based on an underlying free energy functional that accounts for wettability and capillarity. Based on this re-formulation in the framework of nonequilibrium thermodynamics, we propose extensions of the basic hydrodynamic model that account for (i) nonlinear equations of state, (ii) surfactant-dependent wettability, (iii) surfactant phase transitions, and (iv) substrate-mediated condensation. In passing, we discuss important differences to most of the models found in the literature.Comment: 31 pages, 2 figure

About Those New Oats - Burnett and Newton

These two new oat varieties will be available for planting in 1958. You can see them growing this year at Iowa State College or in the fields of certified seed producers. Here are the details on what you can expect

‘Fumifugium: Or the Inconvenience of the Aer and Smoake of London Dissipated’ : emancipatory social accounting in 17th century London

Purpose: This paper extends the nature and relevance of exploring the historical roots of social and environmental accounting by investigating an account that recorded and made visible pollution in 17th century London. John Evelyn's Fumifugium (1661) is characterised as an external social account that bears resemblance to contemporary external accounting particularly given its problematising intentionality. Design/methodology/approach: An interpretive content analysis of the text draws out the themes and features of social accounting. Emancipatory accounting theory is the theoretical lens through which Evelyn's social account is interpreted, applying a microhistory research approach. We interpret Fumifugium as a social account with reference to the context of the reporting accountant. Findings: In this early example of a stakeholder “giving an account” rather than an “account rendered” by an entity, Evelyn problematises industrial pollution and its impacts with the stated intention of changing industrial practices. We find that Fumifugium was used in challenging, resisting and seeking to solve an environmental problem by highlighting the adverse consequences to those in power and rendering new solutions thinkable. Originality/value: This is the first research paper to extend investigations of the historical roots of social and environmental accounting into the 17th century. It also extends research investigating alternative forms of account by focusing on a report produced by an interested party and includes a novel use of the emancipatory accounting theoretical lens to investigate this historic report. Fumifugium challenged the lack of accountability of businesses in ways similar to present-day campaigns to address the overwhelming challenge of climate change

What Happened to our Oats in 1953?

Stem rust, crown rust, temperatures, moisture and- believe it or not- hurricanes, tornadoes and windstorms all combined forces to wreak havoc with Iowa\u27s 1953 oat crop. Here is the story and a look ahead

Rotational Feshbach Resonances in Ultracold Molecular Collisions

In collisions at ultralow temperatures, molecules will possess Feshbach resonances, foreign to ultracold atoms, whose virtual excited states consist of rotations of the molecules. We estimate the mean spacing and mean widths of these resonant states, exploiting the fact the molecular collisions at low energy display chaotic motion. As examples, we consider the experimentally relevant molecules O_2, OH, and PbO. The density of s-wave resonant states for these species is quite high, implying that a large number of narrow resonant states will exist.Comment: 4 pages, 2 figure