Search results for "MOE"
showing 10 items of 1101 documents
ChemInform Abstract: Solution Synthesis of a New Thermoelectric Zn1+xSb Nanophase and Its Structure Determination Using Automated Electron Diffractio…
2010
Thermoelectric nanoparticles of the nominal composition Zn4Sb3 are prepared by heating Sb nanoparticles with a 9-fold excess of Zn particles (synthesized by reaction of SbCl3 or ZnCl2 with Li[Et3BH] in THF at room temperature, and about 65 °C, respectively) in trioctylamine at about 300 °C for 225 min.
Spark Plasma Sintering (SPS)-Assisted Synthesis and Thermoelectric Characterization of Magnéli Phase V6O11
2018
The Magneli phase V6O11 was synthesized in gram amounts from a powder mixture of V6O11/V7O13 and vanadium metal, using the spark plasma sintering (SPS) technique. Its structure was determined with synchrotron X-ray powder diffraction data from a phase-pure sample synthesized by conventional solid-state synthesis. A special feature of Magneli-type oxides is a combination of crystallographic shear and intrinsic disorder that leads to relatively low lattice thermal conductivities. SPS prepared V6O11 has a relatively low thermal conductivity of κ = 2.72 ± 0.06 W (m K)-1 while being a n-type conductor with an electrical conductivity of σ = 0.039 ± 0.005 (μΩ m)-1, a Seebeck coefficient of α = -(3…
Solution Synthesis of a New Thermoelectric Zn1-xSb Nanophase and Its Structure Determination Using Automated Electron Diffraction Tomography
2010
Engineering materials with specific physical properties have recently focused on the effect of nanoscopic inhomogeneities at the 10 nm scale. Such features are expected to scatter medium- and long-wavelength phonons thereby lowering the thermal conductivity of the system. Low thermal conductivity is a prerequisite for effective thermoelectric materials, and the challenge is to limit the transport of heat by phonons, without simultaneously decreasing charge transport. A solution-phase technique was devised for synthesis of thermoelectric "Zn(4)Sb(3)" nanocrystals as a precursor for phase segregation into ZnSb and a new Zn-Sb intermetallic phase, Zn(1+delta)Sb, in a peritectoid reaction. Our …
Indagine antropo-educativa dei bisogni dei minori “fuori” famiglia e dei care leavers
2021
This chapter offers an anthropoloigcal and pedagogical perspective from the results obtained within the European project “Children for children wellbeing: strengthening national child care system to guarantee equal rights for all children ", of which the University of Palermo was a partner, aimed at children in care and care leavers.
An integrated approach based on Life Cycle Assessment and Thermoeconomics: Application to a water-cooled chiller for an air conditioning plant
2018
Abstract A large number of methods for energy systems analysis were developed in the last decades, aimed at acquiring an in-depth understanding of plant performances and enabling analysts to identify optimal design and operating conditions. In this work an integrated approach based on Life Cycle Assessment and Thermoeconomics is proposed as a method for assessing the exergo-environmental profile of energy systems. The procedure combines the capabilities of these two techniques, to account simultaneously for aspects related to thermodynamics of energy conversion processes and to the overall impacts along the plant life cycle related to other phases, i.e. from raw material extraction to the d…
Scope-Oriented Thermoeconomic analysis of energy systems. Part I: Looking for a non-postulated cost accounting for the dissipative devices of a vapou…
2010
Abstract The authors of the main thermoeconomic methodologies developed in the last two decades have recently focused their efforts on the analysis of dissipative devices, i.e. those components whose productive purpose is neither intuitive nor easy to define. Coherent and unanimously accepted cost structures have been identified for dissipative components, while ambiguities still exist as concerns the cost allocation principles to be adopted. Being this aspect evidently cost-influencing, accurate analyses focused on the subjectivity of results are needed. This paper is structured in two parts. In the Part I an in-depth study of some critical issues arising from the thermoeconomic analysis o…
Areas of research and clinical approaches to the study of liver abscess
2016
AIM To analyze the research activity on liver abscess (LA) and identify the main topic clusters in the area. METHODS We identified all documents using the medical subject heading "LA" indexed in the MEDLINE database between 2001 and 2015. We performed a descriptive bibliometric analysis, characterizing the evolution of scientific activity, the publication types of the documents, the document categories of clinical interest (case reports, clinical trials, evaluation studies, meta-analysis, observational studies, practice guidelines and validation studies) and the geographic distribution of the research. We also carried out an analysis of networks and research clusters in order to identify th…
Thermomagnetic Properties Improved by Self-Organized Flower-Like Phase Separation of Ferromagnetic Co2Dy0.5Mn0.5Sn
2012
A thermodynamically stable phase separation of Co2Dy0.5Mn0.5Sn into the Heusler compound Co2MnSn and Co8Dy3Sn4 is induced by rapid cooling from the liquid phase. The phase separation forms an ordered flower-like structure on the microscale. The increased scattering of phonons at the phase boundaries reduces the thermal conductivity and thus improves thermoelectric and spincaloric properties.
Life of Krembegi according to Pierre Clastres
2010
Nell'articolo si analizza un capitolo centrale dell'opera Chronique des Indiens Guayaki di Pierre Clastres. L'analisi della storia di vita illustrata nel testo mostra come l'autore adotti stilemi tipici del romanzo poliziesco per raccontare in forma narrativa la sua ipotesi interpretativa sulla struttura sociale dei Guayaki.
Introduzione a: FUOCO E CARBONE : le tradizioni dei carbonai
2022
L'introduzione al volume: Fuoco e carbone. Le tradizioni dei carbonai sottolinea un’accorta indagine sul lavoro dei carbonai sardi, sulle fasi di produzione del carbone, sull’influenza che hanno avuto le maestranze toscane nel trasferimento di competenze e abilità sui carbonai locali, sul rapporto uomo-mondo vegetale che trovava massima espressione nel “processo di personificazione” della carbonaia con l’attribuzione di nomi e appellativi. Lo studio indaga, inoltre, le prime attestazioni di utilizzo del fuoco da parte degli uomini e gli impieghi ergologici e sociali che proprio il fuoco ha assunto nel tempo, la sua dimensione simbolica, quella linguistica, l’universo eterogeneo di pratiche …