Comparativ (E-Journal)
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On the approximate zeroth and first order consistency in the presence of irregular boundaries in SPH obtained by the virtual boundary particle methods
No full textHousing Price Hikes by Negative Real Interest Rate? A Difference-in-Difference Model Test on Hong Kong and Macau
No full textModelling, assessment and Sankey diagrams of integrated electricity-heat-gas networks in multi-vector district energy systems
No full textThe widespread use of decentralised multi-energy supply solutions such as gas-fired Combined Heat and Power (CHP), heat pumps, gas boilers, and so forth is more and more increasing the linkages between electricity, heat and gas distribution networks. However, there is currently no model able to model the three networks in an integrated manner and with a suitable level of detail for operational purposes. A multi-temporal simulation model, which has been implemented in a relevant MATLAB-Excel VBA tool, is presented in this paper to carry out integrated analysis of electricity, heat and gas distribution networks, with specific applications to multi-vector district energy systems. The network linkages have been modelled through a multi-vector efficiency matrix specifically developed to map the transformation of final demands into network energy flows while taking into account the inter-network locations of the individual supply technologies. The relevant coupled electrical, heat and gas flow equations have been solved simultaneously using a Newton-Raphson approach. A real case study of a district multi-energy system in the Campus of the University of Manchester illustrates the quantitative use of the model in different scenarios for technical, economic and environmental studies. Sankey diagrams of the energy flows across the networks are also presented to give a visual picture of the multi-energy interactions and losses in the district in different scenarios. The model can be flexibly adapted to generic network topologies and multi-energy supply technologies, and can thus be used for practical operational implementations as well as to inform planning of low carbon multi-vector energy systems
On the use of Dynamic Thermal Line Ratings for Improving Operational Tripping Schemes
No full textThe increasing volume of renewable and intermittent generation that is being connected to power systems means that system operators need more advanced dynamic control tools to manage the increase in congestion and the resulting pressure on system constraints. Dynamic thermal line rating (DTLR) is the thermal rating of a transmission line that is calculated in real-time based on online measurements of the loading of the asset and local weather conditions. This dynamic rating will usually be greater than the static rating that is currently used, as the static rating is defined for the worst case scenario. Therefore, using the dynamic rating allows the thermal constraint on a line to be relaxed and the maximum loading increased. An Operational Tripping Scheme (OTS) is a type of System Integrity Protection Scheme (SIPS) that is used to relieve overloads on transmission lines during stressed system conditions by tripping pre-selected generation assets that are connected to the protected lines. . An OTS is used to increase power flow on overhead lines, without building new assets or compromising security, but doing so results in potential generation constraints and higher system risk. This paper presents the novel integration of DTLRs into an existing OTS in order to improve its performance by reducing the likelihood of unnecessary generation tripping due to overly conservative line ratings. This novel OTS affords the system economic benefits, by avoiding unnecessary tripping, and improves system security, by limiting the propagation of disturbed conditions and avoiding unnecessary tripping actions that could initiate dangerous cascading events that might lead to system blackouts. The new scheme is an example of a Wide Area Monitoring, Protection and Control (WAMPAC) application
Fitting the bill? (Dis)embodied disclosure of sexual identities in the workplace
No full textThe disclosure of lesbian, gay or bisexual identity is generally presented as a conscious act of leaving heterosexuality (Ragins, 2004). Such interpretation fails to take into account the dynamic processes involved in constructing non-heterosexual identities and to what degree such identities are embodied or disembodied. Supported by interview data among lesbian and gay employees in six British workplaces, this article explores how non-heterosexual identities become known in organisational settings by arguing that lesbians and gay men continue to collide with social expectations and stereotypical ideas of how sexual identities should be “worn” and performed. These both shape colleagues’ assumptions about their non-heterosexual identities and can expose lesbians and gay men to negative behaviour at work in highly gendered ways
Politics and Eschatology: Reassessing the Appeal of the “Jewish Indian” Theory in England and New England in the 1650s
No full textThis article examines the “Jewish Indian” theory— which claimed that American Indians were the ten lost tribes of Israel— in 1650s England and New England. The theory found support in England while failing in New England. This difference in reception can be explained by considering its ecclesiological, political, and eschatological implications. Biblical commentators in both England and New England held to a form of “Judeo-Centric” eschatology, which looked for a sudden, miraculous conversion of the Jews and their eventual superiority to Gentile believers. Such beliefs undermined crucial elements of New England ecclesiology when applied to Native Americans. Conversely, the New England Company used the theory in its publications as a fund raising tool in England. These publications impacted upon debates on Jewish readmission to England in the mid-1650s, with New England missionary models suggested as a way of evangelising Jews. This article therefore argues for the importance of understanding eschatological beliefs in local contexts, while demonstrating the way in which such beliefs can be maintained and reoriented in the face of apparent disconfirmation
Synthesis and characterization of β-triketimine cobalt complexes and their behaviour in the polymerization of 1,3-butadiene
No full textA non-linear subdiffusion model for a cell-cell adhesion in chemotaxis
No full textThe purpose of this work is to propose a non-Markovian and nonlinear model of subdiffusive transport that involves adhesion affects the cells escape rates form position x, with chemotaxis. This leads the escape rates to be dependent on the particles density at the neighbours as well as the chemotactic gradient. We systematically derive subdiffusive fractional master equation, then we consider the diffusive limit of the fractional master equation. We finally solve the resulted fractional subdiffusive master equation stationery and analyse the role of adhesion in the resulted stationary density
