236 research outputs found
A kinetic approach for the estimation of intracellular concentrations of nitrosative species in cells challenged by nitric oxide
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2013.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references.by Vasileios Theodoros Dendroulakis.Ph.D
The EU’s 2030 Climate and Energy Policy Framework: How net metering slips through its net
No full textNet metering is a support scheme for the promotion of renewable energy sources (RES) that is linked with state-of-the-art trends, especially in the field of electricity, such as distributed generation, self-consumption and energy communities. Whilst the European Union (EU) Clean Energy Package has established a more coherent and comprehensive regime for RES support schemes in general, it makes no explicit reference to net metering schemes. This raises questions as to how and under which terms net metering schemes are compatible with EU law. Against this background, this article aims to analyse the relevant EU law provisions and conduct a comparative analysis of net metering regimes in four Member States to demonstrate that the national schemes enacted and applied have significantly different design features. The article argues that a more coordinated and specific approach on net metering at the EU level should emerge.Iliopoulos, TG (corresponding author), Hasselt Univ, Rergy & Environm Law, Hasselt, Belgium
[email protected]
Untargeted and targeted LC-MS and data processing workflow for the comprehensive analysis of oligopeptides from cyanobacteria
No full textCyanobacteria produce a plethora of structurally diverse bioactive secondary metabolites, including cyanotoxins which pose a serious threat to humans and other living organisms worldwide. Currently, a wide variety of mass spectrometry-based methods for determination of microcystins (MCs), the most commonly occurring and studied class of cyanotoxins, have been developed and employed for research and monitoring purposes. The scarcity of commercially available reference materials, together with the ever-growing range of mass spectrometers and analytical approaches, make the accuracy of quantitative analyses a critical point to be carefully investigated in view of a reliable risk evaluation. This study reports, a comparative investigation of the qualitative and quantitative MCs profile obtained using targeted and untargeted liquid chromatography–mass spectrometry approaches for the analyses of cyanobacterial biomass from Lake Kastoria, Greece. Comparison of the total MCs content measured by the two approaches showed good correlation, with variations in the range of 3.8–13.2%. In addition, the implementation of an analytical workflow on a hybrid linear ion trap/orbitrap mass spectrometer is described, based on combining data-dependent acquisition and a powerful database of cyanobacterial metabolites (CyanoMetDB) for the annotation of known and discovery of new cyanopeptides. This untargeted strategy proved highly effective for the identification of MCs, microginins, anabaenopeptins, and micropeptins. The systematic interpretation of the acquired fragmentation patterns allowed the elucidation of two new MC structural variants, MC-PrhcysR and MC-Prhcys(O)R, and proposal of structures for two new microginins, isomeric cyanostatin B and MG 821A, and three isomeric micropeptins at m/z 846.4715, 846.4711 and 846.4723
A Modular Logic Approach for Expressing Web Services in XML Applying Dynamic Rules in XML
No full textRuleML is considered to be a markup language for the semantic web. It allows the enrichment of web ontologies by adding definitions of derived concepts and it enhances interoperability among different systems and tools by publishing rules in an XML format. Moreover the in-creasing demand for interfaces that enhance information sharing has given rise to XML doc-uments that include embedded calls to web services. In this paper we propose a variation of RuleML that is based on modular logic programming. Our approach is based in a two level architecture. In the first level a modular logic language, called M-log, is presented. This lan-guage encompasses several mechanisms for invoking web services. In the second level we ex-ploit the semantics of M-log to present a variation of RuleML with rich modeling capabilities. Formal foundations for this variation are given through direct translation to M-log semantics.Knowledge Management, XML, Modular Logic Programming, E-Services
Foto- and radiostorage chemiluminescence. Investigation of application of method in the chemical dosimetry and analytical chemistry
No full textThe purpose of this work was to synthesize novel chemiluminescent compounds using photochemical or radiochemical reactions and apply their chemiluminescence in analytical chemistry and radiation dosimetry. For this purpose, over 20 azaaromatic compounds, such as acridines or quinolines as well as the novel third allotropie form of carbon, fullerene C60, were photolyzed or radiolyzed and their products were used to chemiluminescence reactions. The light reactions were initiated using only strong bases such as hydrides or methanolic alkali hydroxides. It should be noted that the overall chemiluminescence quantum yields and intensities of the acridine derivatives appear to be 2-3 orders greater than that of quinolines or fullerene C60. At this point also should be noted that oxygen in contrast to chemiluminescence reactions, where is necessary, in photolysis or radiolysis reactions must be completely removed. The combined two successive reactions, photolysis or radiolysis and chemiluminescence (photo- and radiostoragechemiluminescence) except that they can be used as light- or energy-storage system, they can be used also in analytical chemistry for the quantitative determination of the above mentioned compounds or in radiation chemistry as indirect chemical dosimeters. Indeed, as will be seen later in the chapters of results and discussion many of this compounds can be determined in concentrations down to 10-7 M (few ppb) and in chemical dosimetry from 100 to 3200 Gy. Using more concentrated solutions of these compounds (c=10-3 M), the dose range can be extended up to 10 KGy. The novel method of photo- and radiostoragechemiluminescence can be used also for the estimation of antioxidant activity of many food additives. It was found that all food antioxidants used in the frame of this work, showed at concentrations greater than 10-3 M antioxidant activity over 80%. Finally, it must be mentioned that the reaction of photo- or radiooxygenated amines or amides with aqueous lucigenin gives rise to chemiluminescence quantum yields and intensities similar to those of classical CL-reaction of lucigenin with hydrogen peroxide. As showing in this work, also, the light signals of the reactions can be used in the chemical dosimetry for doses from 50 to 275 KGy.Σκοπός της εργασίας αυτής ήταν η σύνθεση νέων χημειοφωταυγών ενώσεων με χρήση φωτοχημικών ή ακτινοχημικών αντιδράσεων και η εφαρμογή της χημειοφωταύγειάς τους στην αναλυτική χημεία και χημική δοσιμετρία. Για το σκοπό αυτό, πάνω από 20 αζωαρωματικές ενώσεις, όπως ακριδίνες ή κινολίνες καθώς και η τρίτη αλλοτροπική μορφή του άνθρακα, το φουλερένιο Οβο, φωτολύθηκαν ή ραδιολύθηκαν και τα προϊόντα τους χρησιμοποιήθηκαν στις αντιδράσεις χημειοφωταύγειας. Η έναρξη των χημειοφωταυγών αντιδράσεων γίνεται με την προσθήκη ισχυρών βάσεων. Θα πρέπει να σημειωθεί ότι οι ολικές φωτονιακές αποδόσεις και εντάσεις χημειοφωταύγειας των παραγώγων ακριδίνης εμφανίζονται 2 έως 3 τάξεις μεγέθους μεγαλύτερες σε σχέση με αυτές των κινολινών ή του φουλερενίου C60· Στο σημείο αυτό θα πρέπει να τονισθεί ότι ενώ η παρουσία του οξυγόνου στις αντιδράσεις χημειοφωταύγειας είναι απαραίτητη, στις αντιδράσεις φωτόλυσης ή ραδιόλυσης οδηγεί σε μείωση των παραγόμενων προϊόντων και ακολούθως των σημάτων χημειοφωταύγειας. Ο συνδυασμός των δύο αντιδράσεων, φωτόλυσης ή ραδιόλυσης και χημειοφωταύγειας (φωτο- και ραδιοαποθηκευμένη χημειοφωταύγεια) εκτός του ότι θα μπορούσε να χρησιμοποιηθεί ως σύστημα αποθήκευσης φωτός ή ενέργειας, θα μπορούσε να χρησιμοποιηθεί στην αναλυτική χημεία για τον ποσοτικό προσδιορισμό των ενώσεων που αναφέρθηκαν παραπάνω ή στη χημική δοσιμετρία ως έμμεσο χημικό δοσίμετρο. Πράγματι, όπως θα φανεί στη συνέχεια, κατά την παρουσίαση των αποτελεσμάτων και τη συζήτησή τους, πολλές από τις ενώσεις αυτές μπορούν να προσδιορισθούν σε συγκεντρώσεις έως 10-7 Μ (μερικά ppb) ή στη χημική δοσιμετρία από 100 έως 3200 Gy. Χρησιμοποιώντας διαλύματα μεγαλύτερων συγκεντρώσεων (C=10-3 Μ) μπορούν να προσδιορισθούν δόσεις ακτινοβολίας μέχρι και 10 KGy. Η νέα μέθοδος της φωτο- και ραδιοαποθηκευμένης χημειοφωταύγειας μπορεί επίσης να χρησιμοποιηθεί για την εκτίμηση της αντιοξειδωτικής δράσης πολλών προσθέτων σε τρόφιμα. Πολλά αντιοξειδωτικά τροφίμων που χρησιμοποιήθηκαν στην εργασία αυτή παρουσίασαν αντιοξειδωτική δράση πάνω από 80% για συγκεντρώσεις μεγαλύτερες από 10-3 Μ. Τέλος, πρέπει να αναφερθεί ότι οι αντιδράσεις φωτο- ή ραδιοξυγονομένων αμινών ή αμιδίων με υδατικό διάλυμα λουσιγενίνης οδηγούν στην εκπομπή φωτός με φωτονιακές αποδόσεις και εντάσεις χημειοφωταύγειας παρόμοιες με αυτές της κλασικής αντίδρασης χημειοφωταύγειας της λουσιγενίνης με υπεροξείδιο του υδρογόνου. Όπως θα φανεί στην εργασία αυτή τα φωτεινά σήματα των αντιδράσεων αυτών μπορούν να χρησιμοποιηθούν στη χημική δοσιμετρία για δόσεις ακτινοβολίας από 50 έως 275 KGy
Electrification of transportation sharing economy business models: the ride- and carsharing cases
No full textElectrification of urban transportation is on the rise. In April 2016, ridesharing company Teo Taxi launched a plug-in electric vehicle (PEV) fleet followed four months later by Uber. In 2020 Volkswagen will start a fully-electric carsharing platform, whereas other companies such as BMW already provide such a service. When driven, an electric vehicle garners profit for the platform through transportation. When parked, it can act as a controllable storage device either consuming surplus or injecting energy to the grid. Hence, managed PEV fleets provide unique grid-support opportunities, and added profits to the platform through vehicle-to-grid services. This thesis looks into two types of sharing economy business models with electric vehicles, namely the ride- and carsharing models. The former type of platform has transactional control over the vehicles, that is, private drivers respond to monetary incentives. The latter directly controls its fleet. This thesis develops a mathematical framework to analyze the aforementioned models through queuing theory. It characterizes viable control strategies for the platforms to co-optimize their revenues from both transportation and grid services. It develops profit maximization algorithms of the PEV fleet managers providing such services. Finally, variables of interest are plotted as a function of various platform parameters.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2021-05-01The student, Theodoros Mamalis, accepted the attached license on 2019-04-05 at 13:53.The student, Theodoros Mamalis, submitted this Thesis for approval on 2019-04-05 at 14:09.This Thesis was approved for publication on 2019-04-05 at 16:34.DSpace SAF Submission Ingestion Package generated from Vireo submission #13496 on 2019-08-22 at 15:05:24Made available in DSpace on 2019-08-23T20:35:45Z (GMT). No. of bitstreams: 2
MAMALIS-THESIS-2019.pdf: 2332090 bytes, checksum: a2df675a94167b12291ed9bda0a2837c (MD5)
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Previous issue date: 2019-04-05Embargo set by: Seth Robbins for item 112110
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An Auditing Approach for ERP Systems Examining Human Factors that Influence ERP User Satisfaction
No full textThis paper tries to connect the successful implementation and operation of the ERP (Enterprise Resource Planning) information systems with people and their characteristics through a pilot survey. It examines the human factors that influence ERP user satisfaction. The presented survey tests 14 hypotheses and is based on the model developed by Zviran, Pliskin & Levin [21]. An additional factor has been added to the specified model, the self-efficacy factor analyzed by Bandura [1]. The results are based on 250 ERP users that responded to the survey. The key findings that were revealed by data analysis were that none of the human socio-demographic characteristics do influence ERP user satisfaction. Additionally it was found that perceived usefulness and self-efficacy are the key directors of the ERP user satisfaction. Moreover suggestions are given about how the companies should handle ERP usage in order to develop the prerequisites for increasing user satisfaction and productivity accordingly.ERP Audit, User Satisfaction, Perceived Usefulness
Cyanotoxins in Bloom: Ever-Increasing Occurrence and Global Distribution of Freshwater Cyanotoxins from Planktic and Benthic Cyanobacteria
No full textToxic cyanobacteria in freshwater bodies constitute a major threat to public health and aquatic ecosystems [...
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