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Tensile strain and compress strain can greatly affect the thermal conductivity of graphene nanoribbons (GNRs). However, the effect of GNRs under shear strain, which is also one of the main strain effect, has not been studied systematically yet. In this work, we employ reverse nonequilibrium molecular dynamics (RNEMD) to the systematical study of the thermal conductivity of GNRs (with model size of 4 nm × 15 nm) under the shear strain. Our studies show that the thermal conductivity of GNRs is not sensitive to the shear strain, and the thermal conductivity decreases only 12–16% before the pristine structure is broken. Furthermore, the phonon frequency and the change of the micro-structure of GNRs, such as band angel and bond length, are analyzed to explore the tendency of thermal conductivity. The results show that the main influence of shear strain is on the in-plane phonon density of states (PDOS), whose G band (higher frequency peaks) moved to the low frequency, thus the thermal conductivity is decreased. The unique thermal properties of GNRs under shear strains suggest their great potentials for graphene nanodevices and great potentials in the thermal managements and thermoelectric applications.
Im Aufsatz "Zwei Pater noster-Vertonungen von Melchior Vulpius und die Missa V. vocum super Pater noster qui es in Coelis Melchioris Vulpii von Georg Vintz" werden Pater noster-Vertonungen aus dem OPUSCULUM NOVUM SELECTISSIMARVUM CANTIONVM SACRARVM (Erfurt 1610) und aus der PARS PRIMA CANTIONVM SACRARVM (Jena 1602) des Weimarer Kantors und Komponisten Melchior Vulpius (1570 - 1615) besprochen und miteinander verglichen. Ebenso wird untersucht, in welcher Weise der Naumburger Organist Georg Vintz (ca. 1580 - ca. 1635) eine dieser Motetten als Grundlage für die Parodiemesse "MISSA V. VOCUM,Super Pater noster [...] Melchioris Vulpii" genutzt und bearbeitet hat.
Der Aufsatz beruht auf einem Vortrag bei einer Tagung über Vulpius, die 2015 in Meiningen stattfand. Der Tagungsband, den Maren Goltz herausgeben wird, erscheint vermutlich 2018. Da im Band nicht genügend Platz für ausführliche Notenbeispiele ist, werden die besprochenen Kompositionen vollständig als Noten- und Klangdateien durch diesen Permalink zur Verfügung gestellt.
One of the frequently examined design principles recommendations in multimedia learning is the personalization principle. Based on empirical evidence this principle states that using personalised messages in multimedia learning is more beneficial than using formal language (e.g. using ‘you’ instead of ‘the’). Although there is evidence that these slight changes in regard to the language style affect learning, motivation and the perceived cognitive load, it remains unclear, (1) whether the positive effects of personalised language can be transferred to all kinds of content of learning materials (e.g. specific potentially aversive health issues) and (2) which are the underlying processes (e.g. attention allocation) of the personalization effect. German university students (N= 37) learned symptoms and causes of cerebral haemorrhages either with a formal or a personalised version of the learning material. Analysis revealed comparable results to the few existing previous studies, indicating an inverted personalization effect for potentially aversive learning material. This effect was specifically revealed in regard to decreased average fixation duration and the number of fixations exclusively on the images in the personalised compared to the formal version. This result can be seen as indicators for an inverted effect of personalization on the level of visual attention.
Die Idee eines neuen Munizipalismus wird in den linken sozialen Bewegungen Europas und darüber hinaus breit diskutiert. Munizipalistische Bewegungen streben es an, kommunale Regierungen zu übernehmen oder zu beeinflussen, um lokale Institutionen (wieder) gemeinwohlorientiert auszurichten, ein neues Verhältnis zwischen kommunalen Regierungen und sozialen Bewegungen zu schaffen und so die Art wie Politik gestaltet wird von unten her zu demokratisieren und institutionelle Rahmenbedingungen zu verändern. Sie entstehen in Reaktion auf die aktuelle ökonomische und politische Krise – ebenso wie neue rechte und rechtspopulistische Bewegungen, als deren Gegenpart sie sich verstehen. Mit Mut und konkreten Utopien will man der multiplen städtischen Krise begegnen, statt mit Angst und Angstmacherei wie rechte Bewegungen. Deshalb trafen sich im Juni 2017 über 600 Vertreter_innen dieser munizipalistischen Bewegungen auf Einladung Barcelona en Comús.
Dieser Artikel analysiert, in welcher Weise sich die Weltkunstausstellung documenta 14 mit dem öffentlichen Raum in Kassel auseinandersetzte. Als Kritik an globalen Unrechtszuständen konzipiert, ging die diesjährige Documenta nicht auf die lokalen Umstände in Kassel ein und benutzte die Stadt stattdessen als Bühne. Statt sich mit den konkreten Prozessen vor Ort auseinanderzusetzen, wie die Ausstellung dies in Athen getan hat, wird die Tradition der Documenta gebrochen, einen Beitrag zur gesellschaftlichen Stadtentwicklung leisten zu wollen.
Elitenkritik, populare Bündnisse und inklusive Solidaritär. Interview zur Debatte um Linkspopulismus
(2018)
In der aktuellen ökonomischen und politischen Krise haben Debatten um linke Strategien wieder Hochkonjunktur. Besonders kontrovers werden Vorschläge diskutiert, die einen Linkspopulismus als Alternative zum rechten politischen Projekt, zum Neoliberalismus und als Transformationsstrategie hin zu einer sozialistischen Gesellschaft propagieren. Thomas Goes und Violetta Bock haben mit ihrem Buch Ein unanständiges Angebot? Mit linkem Populismus gegen Eliten und Rechte (2017) eine programmatische Aufarbeitung existierender linker Populismuskonzepte und ihre eigene Vorstellung davon, wie ein linker Populismus gelingen kann, vorgelegt. Damit haben sie die Debatte um Linkspopulismus in Deutschland befeuert. Im Interview werden sie nach ihren Positionen und den Kontroversen um das Buch befragt. Das Interview soll als Aufschlag für eine Debatte dienen. Antworten zu den dargestellten Positionen und Bezüge zu städtischen Themen und städtischen sozialen Bewegungen sind sehr willkommen.
Following restructuring of power industry, electricity supply to end-use customers has undergone fundamental changes. In the restructured power system, some of the responsibilities of the vertically integrated distribution companies have been assigned to network managers and retailers. Under the new situation, retailers are in charge of providing electrical energy to electricity consumers who have already signed contract with them. Retailers usually provide the required energy at a variable price, from wholesale electricity markets, forward contracts with energy producers, or distributed energy generators, and sell it at a fixed retail price to its clients. Different strategies are implemented by retailers to reduce the potential financial losses and risks associated with the uncertain nature of wholesale spot electricity market prices and electrical load of the consumers. In this paper, the strategic behavior of retailers in implementing forward contracts, distributed energy sources, and demand-response programs with the aim of increasing their profit and reducing their risk, while keeping their retail prices as low as possible, is investigated. For this purpose, risk management problem of the retailer companies collaborating with wholesale electricity markets, is modeled through bi-level programming approach and a comprehensive framework for retail electricity pricing, considering customers’ constraints, is provided in this paper. In the first level of the proposed bi-level optimization problem, the retailer maximizes its expected profit for a given risk level of profit variability, while in the second level, the customers minimize their consumption costs. The proposed programming problem is modeled as Mixed Integer programming (MIP) problem and can be efficiently solved using available commercial solvers. The simulation results on a test case approve the effectiveness of the proposed demand-response program based on dynamic pricing approach on reducing the retailer’s risk and increasing its profit.
In this paper, the decision-making problem of the retailers under dynamic pricing approach for demand response integration have been investigated. The retailer was supposed to rely on forward contracts, DGs, and spot electricity market to supply the required active and reactive power of its customers. To verify the effectiveness of the proposed model, four schemes for retailer’s scheduling problem are considered and the resulted profit under each scheme are analyzed and compared. The simulation results on a test case indicate that providing more options for the retailer to buy the required power of its customers and increase its flexibility in buying energy from spot electricity market reduces the retailers’ risk and increases its profit. From the customers’ perspective also the retailers’accesstodifferentpowersupplysourcesmayleadtoareductionintheretailelectricityprices. Since the retailer would be able to decrease its electricity selling price to the customers without losing its profitability, with the aim of attracting more customers. Inthiswork,theconditionalvalueatrisk(CVaR)measureisusedforconsideringandquantifying riskinthedecision-makingproblems. Amongallthepossibleoptioninfrontoftheretailertooptimize its profit and risk, demand response programs are the most beneficial option for both retailer and its customers. The simulation results on the case study prove that implementing dynamic pricing approach on retail electricity prices to integrate demand response programs can successfully provoke customers to shift their flexible demand from peak-load hours to mid-load and low-load hours. Comparing the simulation results of the third and fourth schemes evidences the impact of DRPs and customers’ load shifting on the reduction of retailer’s risk, as well as the reduction of retailer’s payment to contract holders, DG owners, and spot electricity market. Furthermore, the numerical results imply on the potential of reducing average retail prices up to 8%, under demand response activation. Consequently, it provides a win–win solution for both retailer and its customers.
Management strategies for sustainable sugarcane production need to deal with the increasing complexity and variability of the whole sugar system. Moreover, they need to accommodate the multiple goals of different industry sectors and the wider community. Traditional disciplinary approaches are unable to provide integrated management solutions, and an approach based on whole systems analysis is essential to bring about beneficial change to industry and the community. The application of this approach to water management, environmental management and cane supply management is outlined, where the literature indicates that the application of extreme learning machine (ELM) has never been explored in this realm. Consequently, the leading objective of the current research was set to filling this gap by applying ELM to launch swift and accurate model for crop production data-driven. The key learning has been the need for innovation both in the technical aspects of system function underpinned by modelling of sugarcane growth. Therefore, the current study is an attempt to establish an integrate model using ELM to predict the concluding growth amount of sugarcane. Prediction results were evaluated and further compared with artificial neural network (ANN) and genetic programming models. Accuracy of the ELM model is calculated using the statistics indicators of Root Means Square Error (RMSE), Pearson Coefficient (r), and Coefficient of Determination (R2) with promising results of 0.8, 0.47, and 0.89, respectively. The results also show better generalization ability in addition to faster learning curve. Thus, proficiency of the ELM for supplementary work on advancement of prediction model for sugarcane growth was approved with promising results.