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Due to increased emissions of palladium nanoparticles in recent years, it is important to develop analytical techniques to characterize these particles. The synthesis of defined and stable particles plays a key role in this process, as there are not many materials commercially available yet which could act as reference materials. Polyvinylpyrrolidone- (PVP-) stabilized palladium nanoparticles were synthesized through the reduction of palladium chloride by tetraethylene glycol (TEG) in the presence of KOH. Four different methods were used for particle size analysis of the palladium nanoparticles. Palladium suspensions were analyzed by scanning electron microscopy (SEM), small angle X-ray scattering (SAXS), single-particle ICP-MS (SP-ICP-MS), and X-ray diffraction (XRD). Secondary particles between 30 nm and 130 nm were detected in great compliance with SAXS and SP-ICP-MS. SEM analysis showed that the small particulates tend to form agglomerates.
The development of sustainable, environmentally friendly insulation materials with a reduced carbon footprint is attracting increased interest. One alternative to conventional insulation materials are foamed geopolymers. Similar to foamed concrete, the mechanical properties of geopolymer foams can also be improved by using fibers for reinforcement. This paper presents an overview of the latest research findings in the field of fiber-reinforced geopolymer foam concrete with special focus on natural fibers reinforcement. Furthermore, some basic and background information of natural fibers and geopolymer foams are reported. In most of the research, foams are produced either through chemical foaming with hydrogen peroxide or aluminum powder, or through mechanical foaming which includes a foaming agent. However, previous reviews have not sufficiently addresses the fabrication of geopolymer foams by syntactic foams. Finally, recent efforts to reduce the fiber degradation in geopolymer concrete are discussed along with challenges for natural fiber reinforced-geopolymer foam concrete.
Design and characterization of geopolymer foams reinforced with Miscanthus x giganteus fibers
(2024)
This paper presents the effects of different amounts of fibers and foaming agent, as well as different fiber sizes, on the mechanical and thermal properties of fly ash-based geopolymer foams reinforced with Miscanthus x giganteus fibers. The mechanical properties of the geopolymer foams were measured through compressive strength, and their thermal properties were characterized by thermal conductivity and X-ray micro-computed tomography. Furthermore, design of experiment (DoE) were used to optimize the thermal conductivity and compressive strength of Miscanthus x giganteus reinforced geopolymer foams. In addition, the microstructure was studied using X-ray diffraction (XRD), Field emission scanning electron microscopy (SEM) and Fourier-Transform Infrared Spectroscopy (FTIR). Mixtures with a low thermal conductivity of 0.056 W (m K)−1 and a porosity of 79 vol% achieved a compressive strength of only 0.02 MPa. In comparison, mixtures with a thermal conductivity of 0.087 W (m K)−1 and a porosity of 58 vol% achieved a compressive strength of 0.45 MPa.
Der Behindertenspitzensport hat sich in den letzten Jahren – nicht nur leistungsmäßig – in hohem Maße weiterentwickelt. Öffentlichkeit und Medien widmen ihm größere Aufmerksamkeit und bringen den Athleten mehr Akzeptanz entgegen als in der Vergangenheit. Auch der werbliche Einsatz dieses Sportbereichs erfährt gute Bewertungen. Laut aktuellen Umfragen in der Bevölkerung lässt sich durch die Schaltung von Anzeigen mit behinderten Spitzenathleten das Unternehmensimage positiv beeinflussen.
Erst seit wenigen Jahren binden Unternehmen den Behindertenspitzensport in ihre Kommunikationsaktivitäten ein. Da die Anzahl der damit arbeitenden Firmen zudem gering ist, lagen bislang kaum Informationen und Erfahrungswerte vor, die anderen an einem Engagement in diesem Bereich Interessierten Orientierungshilfen bieten konnten.
Background
Consumers rely heavily on online user reviews when shopping online and cybercriminals produce fake reviews to manipulate consumer opinion. Much prior research focuses on the automated detection of these fake reviews, which are far from perfect. Therefore, consumers must be able to detect fake reviews on their own. In this study we survey the research examining how consumers detect fake reviews online.
Methods
We conducted a systematic literature review over the research on fake review detection from the consumer-perspective. We included academic literature giving new empirical data. We provide a narrative synthesis comparing the theories, methods and outcomes used across studies to identify how consumers detect fake reviews online.
Results
We found only 15 articles that met our inclusion criteria. We classify the most often used cues identified into five categories which were (1) review characteristics (2) textual characteristics (3) reviewer characteristics (4) seller characteristics and (5) characteristics of the platform where the review is displayed.
Discussion
We find that theory is applied inconsistently across studies and that cues to deception are often identified in isolation without any unifying theoretical framework. Consequently, we discuss how such a theoretical framework could be developed.
Mobile Business
(2009)
Auf der Basis des modernen Mobilfunks entstehen neuartige Wertschöpfungsstrukturen, die die traditionellen Wirtschaftsstrukturen komplementieren und immer häufiger auch substituieren. Unternehmen, die in der "Mobile Economy" erfolgreich bestehen wollen, müssen sich daher umfassend mit den strategischen Rahmenbedingungen des Mobile Business auseinandersetzen. Nur wer die Einsatzpotenziale der multimedialen Mobilkommunikation differenziert bewerten kann und auch die kritischen Erfolgsfaktoren dieser noch jungen Disziplin kennt, wird in der mobilen Zukunft seine Wettbewerbsposition tatsächlich nachhaltig stärken können.
Mobile-Commerce-Studie
(2000)
An der Fachhochschule Bonn-Rhein-Sieg wurde im Rahmen eines Forschungssemesters eine Szenarioanalyse durchgeführt, welche die Entwicklungspfade von Mobile Business bis zum Jahr 2011 untersucht. Dabei wurden maßgebliche Entwicklungstreiber bestimmt und ihre zukünftige Ausprägung sowie ihr Zusammenspiel analysiert. Es entstanden drei plausible Zukunftsbilder. Das wahrscheinlichste der drei Trendszenarien, mit einer Eintrittswahrscheinlichkeit von 60 %, basiert auf der Untersuchung der zehn bedeutendsten Entwicklungstreiber von Mobile Business. Danach wird der Ausbau der UMTS-Netze bis 2011 soweit vorangeschritten sein, dass 70 % der potentiellen Anwender breitbandige Anschlüsse werden nutzen können. In Ballungsgebieten/Großstädten werden Übertragungsraten von mehr als acht MBit/s verfügbar sein. Speicherkapazität, Geschwindigkeit und Funktionsumfang der Endgeräte verbessern sich deutlich. Software für moilbe Lösungen unterstützen vielfältige Geschäftsprozesse und bieten bis 2011 weitgehend Desktop-Funktionalität. Es entstehen alternative Betreibermodelle - die Software verlagert sich zunehmend ins Netz. Die laufenden Kosten des Mobile Business sinken nur langsam, da die Tarife für mobile Kommunikation weiterhin künstlich hochgehalten werden. Die Preise für Endgeräte bleiben relativ konstant. Mobile Lösungen werden in vielen Branchen zu Schlüsselanwendungen, und wer hier nicht das Optimierungspotential ausschöpft, der erleidet zunehmend Wettbewerbsnachteile. Aus diesenTrends ergeben sich Handlungsempfehlungen für Unternehmen. Sie sollten ihre Prozesse gezielt durch Multimedia-Kommunikation unterstützen und mobile Mitarbeiter mit für sie maßgeschneiderten Endgeräten ausstatten.
Kenya, like all other developing countries in the world, is faced with the task of working strategically towards the achievement of the Sustained Development Goals (SDGs) 2030. These goals whose due date of accomplishment coincides with those of the national development blueprint, namely, the Kenya Vision 2030, have become a major focus of attention in the country. Conferences, workshops, and seminars are organized throughout the country on regular bases by joint multiplicity of organizations to address modalities of ensuring a timely achievement of SDGs in the country. Universities either individually or jointly are working towards this same target. More specifically, there are great areas of concern or priority areas that the country is focusing on as a strategic focus towards the achievement of the Kenya Vision 2030 and SDGs 2030. These strategic areas of focus have been isolated and declared by the President of the Republic of Kenya, His Excellency Uhuru Kenyatta, as the country’s “big four priority areas”, namely, affordable housing, affordable health care, food security, and manufacturing as a grandiose effort towards achievement of the SDGs, Kenya Vision 2030 as well as job and wealth creation. Similarly, Mount Kenya University’s top management established the Graduate Enterprise Academy (GEA) in 2013 under the direct Patronage of the university’s Founder with the primary aim of assisting graduates to be job and wealth creators rather than being job seekers. So far, over twenty start-ups are running throughout the country under Graduate Enterprise Academy (GEA). Incidentally, although the Graduate Enterprise Academy’s diverse areas of focus extend beyond the President of Kenya’s “Big Four” to include ICT and creative arts, among others, there are justifiable cases to indicate that GEA’s activities are also in support of the national “Big Four” agenda. This paper gives an exposition of different start-ups under MKU’s Graduate Enterprise Academy and are show-cased as evidence of MKU’s support towards the achievement of the national “Big Four” agenda. The paper covers a part of an ongoing program through desk-top analyses of reports, with an objective of show-casing MKU’s contribution to the national agenda through the Graduate Enterprise Academy for possible scale - up.
IT-Offshoring - Nein danke!
(2006)