1,720,955 research outputs found
A Multi-Objective Optimization of a District Heating Network: Integrated and Dynamic Decarbonization Solutions for the Case Study of Riva Del Garda (Italy)
No full textThis study explores the decarbonization of the district heating network in Riva del Garda. The existing system (baseline) was modeled in EnergyPLAN, and future configurations were optimized using a Multi-Objective Evolutionary Algorithm (MOEA) to minimize both CO2 emissions and annual costs. Nine decision variables were assessed under defined boundary conditions to generate alternative future scenarios grouped into five types. In Type A, a large deep geothermal cogeneration plant combined with a small biomass boiler achieved the only zero-emission solution, with lower annual costs than the baseline but high capital needs. Excluding deep geothermal cogeneration (Type B) led to dominance of the biomass boiler and waste heat recovery from the Alto Garda Power (AGP) plant; full decarbonization remained possible only with extensive biomass use at a higher cost. Removing biomass (Type C), the solar thermal plant, and the shallow geothermal heat pump enabled deep but costly decarbonization, including grid electricity dependence. Types D and E, dominated, respectively, by shallow geothermal heat pump and electric boiler, provided moderate emission reductions and further increase in costs. Across all types, thermal storage improved operational flexibility. These analyses were also extended to assess potential district heating network expansions within Riva del Garda and into the neighboring municipality of Arco
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Role of Hydrogeological Traits in Numerical Simulation of Aquifer Thermal Energy Storage
Full text linkLAUREA MAGISTRALEPubblicazioni recenti suggeriscono che l'implementazione dei sistemi di Accumulo di Energia Termica in Acquiferi (ATES) per scopi di riscaldamento e raffreddamento può portare a considerevoli risparmi energetici e alla significativa riduzione delle emissioni di gas serra. I sistemi ATES, operanti a temperature basse o moderate, possono agire come accumulatori di energia per la gestione di impianti solari, termici, di cogenerazione e sistemi intelligenti di distribuzione dell'energia. Valutare il potenziale delle risorse geotermiche è una sfida multifattoriale che richiede competenze interdisciplinari, con l'ingegneria dei reservoir che svolge un ruolo fondamentale. Lo scopo del presente studio è chiarire l'influenza delle caratteristiche intrinseche degli acquiferi superficiali sull'efficienza dell'installazione dei sistemi ATES. Questa ricerca comporta un'analisi comparativa delle prestazioni in diverse condizioni idrogeologiche sotterranee attraverso simulazioni numeriche. Sono state effettuate simulazioni numeriche di ATES in acquiferi superficiali per tre casi studio nell'area metropolitana di Milano, con differenti condizioni idrogeologiche sotterranee. Utilizzando dati raccolti da tre località selezionate all'interno dell'Area Metropolitana di Milano, sono stati realizzati modelli semplificati di tipo "box-model" di acquiferi confinati per i tre case-studies. L'assunzione di semi confinamento dell'acquifero non è del tutto accurata per gli acquiferi superficiali nell'Area Metropolitana di Milano in Italia; a fini di confronto, sono stati realizzati e testati anche modelli di acquiferi semi confinati per valutare le risposte del sistema ATES in condizioni variabili di (i) eterogeneità nelle proprietà delle rocce, (ii) temperatura media dell'acquifero, (iii) gradiente idraulico medio dovuto al flusso naturale dell'acquifero, (iv) ricarica effettiva da pioggia dell'acquifero e (v) l'impatto della pressione capillare dell'acqua/aria. Le diverse simulazioni utilizzano il software ECLIPSE 100 (formulazione black-oil). Per limitare la variabilità del risultato, sono stati assunti fissi, in ogni case-study, i pozzi di estrazione e di iniezione in modo da osservare l’impatto dei parametri già citati. Isolando l'influenza delle principali caratteristiche dell'acquifero sulle simulazioni numeriche di ATES, questo studio può fornire preziose informazioni sul ruolo di diversi attributi idrogeologici nelle prestazioni, ad esempio, l'efficienza di recupero, dei sistemi ATES. Lo studio conferma che la eterogeneità delle proprietà delle rocce esercita l'influenza più significativa sull'efficienza del sistema ATES. L'impatto della ricarica effettiva da pioggia e della pressione capillare all'interno dell'acquifero varia a seconda delle circostanze specifiche, comportando cambiamenti di efficienza trascurabili. Lo studio numerico può gettare luce su come varie componenti delle caratteristiche idrogeologiche influenzino l'efficienza dei sistemi ATES. Questo lavoro costituisce un primo passo verso una valutazione completa della fattibilità tecnica dell'installazione del sistema ATES nell'Area Metropolitana di Milano.Recent literature works suggest that the implementation of Aquifer Thermal Energy Storage (ATES) systems for heating and cooling purposes can yield reasonable substantial energy savings, leading to a significant reduction in greenhouse gas emissions. Low temperature ATES systems (i.e., operating at low to moderate temperature levels) can act as energy buffers for managing solar, thermal, combined heat and power plants, and intelligent district energy systems. Indeed, evaluating the potential of geothermal resources is a multifaceted challenge requiring interdisciplinary expertise, with reservoir engineering playing a pivotal role. Present study aims to elucidate the influence of inherent shallow aquifer characteristics on the efficiency of installing ATES systems. Our research involves a comparative analysis of performance across diverse subsurface hydrogeological settings through numerical simulations. We perform numerical simulations of ATES in shallow aquifers for three test cases in Milano metropolitan across diverse subsurface hydrogeological settings. Utilizing data collected from three selected locations within the Milan metropolitan Area, we construct simplified box-models of confined aquifers for our three test cases. Simplicity assumption of confined aquifer is not entirely accurate for shallow aquifers in Milan metropolitan area in Italy; for comparison purposes, semi-confined aquifer models are also constructed and tested to assess responses of the ATES system under varying conditions of (i) heterogeneity in rock properties, (ii) aquifer average temperature, (iii) average hydraulic gradient due to aquifer natural flow, (iv) effective rainfall recharge of the aquifer, and (v) the impact of water/air capillary pressure. Our simulations employ in the ECLIPSE 100 (i.e., black-oil formulation of the mathematical models) software environment. To constrain variation of the simulation responses solely to the above-mentioned characteristic parameters of our interest, we maintain consistent well placement and control settings across all comparative test cases. By isolating the influence of key aquifer characteristics on ATES numerical simulations, our research can provide valuable insights into the role of different hydrogeological attributes in the performance, e.g., recovery efficiency, of ATES systems. Our study confirms that simulating a numerical box (confined) model characterized by a homogeneous distribution of permeability/porosity fields can yield notably different recovery efficiencies compared to the open-aquifer simulation model due to the complex interplay of multiple factors, including rock attributes, hydraulic gradients, thermal parameters, temperature fields, effective rainfall recharge, and capillary pressure effects. Our numerical results indicate that heterogeneity of the rock attributes exerts the most significant influence on efficiency of the ATES system. The impact of effective rainfall recharge and capillary pressure within the aquifer varying depending on the specific circumstances, resulting in negligible efficiency changes. Present numerical study can shed light on how various components of hydrogeological characteristics impact the efficiency of ATES systems. This work can constitute a preliminary step toward a comprehensive technical feasibility assessment of installing ATES system in Milano metropolitan
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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