Search results for " element"
showing 10 items of 2679 documents
Improving the Downwind Sail Design Process by Means of a Novel FSI Approach
2021
The process of designing a sail can be a challenging task because of the difficulties in predicting the real aerodynamic performance. This is especially true in the case of downwind sails, where the evaluation of the real shapes and aerodynamic forces can be very complex because of turbulent and detached flows and the high-deformable behavior of structures. Of course, numerical methods are very useful and reliable tools to investigate sail performances, and their use, also as a result of the exponential growth of computational resources at a very low cost, is spreading more and more, even in not highly competitive fields. This paper presents a new methodology to support sail designers in ev…
Method development for determination and recovery of rare earth elements from industrial fly ash
2014
Rare earth elements (REE) are important in numerous high technology applications and in addition their supply risk is high, which gives rise to studying new sources for rare earth elements. Rare earth element concentrations in industrial fly ash samples collected from Finnish power plants, using a mixture of peat and biomass as a fuel, have been determined. Two sample pre-treatment methods, ultrasound- and microwave-assisted acid digestions, have been applied to fly ash samples. Measurement conditions for inductively coupled plasma-optical emission spectrometry (ICP–OES) have been optimized to reach robust plasma conditions and the reliability of the analysis has been investigated by using …
Experimental Observation of a Large Low-Frequency Band Gap in a Polymer Waveguide
2018
The quest for large and low-frequency band gaps is one of the principal objectives pursued in a number of engineering applications, ranging from noise absorption to vibration control, and to seismic wave abatement. For this purpose, a plethora of complex architectures (including multiphase materials) and multiphysics approaches have been proposed in the past, often involving difficulties in their practical realization. To address the issue of proposing a material design that enables large band gaps using a simple configuration, in this study we propose an easy-to-manufacture design able to open large, low-frequency complete Lamb band gaps exploiting a suitable arrangement of masses and stif…
Incorporación de elementos traza en conchas de melanopsis durante el crecimiento : posibilidades de aplicación en paleoecología
1988
El objetivo del presente trabajo está encaminado al estudio de las variaciones de oligoelementos en la concha de un gasterópodo de agua dulce del género Melanopsis (U dufouri (FERUSSAC), con dos morfotipos) y si éstas tienen que ver, o no, con la fluctuación de una serie de parámetros ambientales. La importancia del trabajo radica en la posibilidad de la aplicación paleoecológica de sus resultados, ya que el género MelanopsÍs tiene un abundante registro fósil durante todo el Cenozoico. La incorporación de oligoelementos se efectúa a medida que la concha va creciendo por acreción; lo ideal sería que tal crecimiento fuera circadiano, ya que se podría seguir día a día, sobre la concha, la fluc…
Hertagramma: somu grupas H.I.M. lingvistiskā un semiotiskā analīze
2016
Semiotikas un lingvistikas nozarē ir izstrādātas dažādas teorijas mūzikas analīzei, īpaši neaplūkojot papildu mūzikas elementu devumu mūzikas nozīmē. Metāla mūzikā šos elementus izmanto, lai grupas sevišķā mūzikas stila pamatā radītu ideju un nodotu īpašus vēstījumus. Šis pētījums nosaka un analizē grupas H.I.M. papildu mūzikas elementus. Rezultāti uzskatāmi parāda šo elementu nozīmi grupas mūzikas izpratnes procesā un to devumu grupas unikālā jēdziena 'mīlas metāls' attīstībā. Grupu papildu mūzikas elementi jāņem vērā, pētot metāla mūzikas nozīmi un nosakot robežas starp mūzikas stiliem. Šie elementi ir izrādījušies ļoti nozīmīgi mūzikas idejas definēšanā, un tie ir diskursa vienība, ar ku…
Biogēno elementu koncentrācijas un plūsmas ilgtermiņa izmaiņas Lielupē
2016
Darba mērķis ir izpētīt biogēno elementu koncentrācijas mainību gadu gaitā, kā arī sezonāli, Lielupes ūdeņos. Darba izstrādē izmantoti LVĢMC arhīvu dati no 6 monitoringa posteņiem, kas izvietoti dažādos upes posmos. Dati kopumā ievākti laika posmā no 1980. līdz 2014. gadam. Darbā sniegts Lielupes sateces baseina fizģeogrāfisks raksturojums, klimatisko, ģeoloģisko, ģeogrāfisko un antropogēno faktoru raksturojums, kas ietekmē biogēno elementu koncentrāciju un tās mainību upes ūdeņos. Veikta biogēno elementu koncentrācijas mainības izpēte gadu gaitā, kā arī to koncentrācijas sezonālās mainības izpēte. Bakalaura darbs sastāv no 59 lappusēm, kuras papildinātas ar ilustratīvo materiālu – 41 attēl…
Charged jet cross sections and properties in proton-proton collisions at $\sqrt{s}=7$ TeV
2015
The differential charged jet cross sections, jet fragmentation distributions, and jet shapes are measured in minimum bias proton-proton collisions at centre-of-mass energy $\sqrt{s}=7$ TeV using the ALICE detector at the LHC. Jets are reconstructed from charged particle momenta in the mid-rapidity region using the sequential recombination $k_{\rm T}$ and anti-$k_{\rm T}$ as well as the SISCone jet finding algorithms with several resolution parameters in the range $R=0.2$ to $0.6$. Differential jet production cross sections measured with the three jet finders are in agreement in the transverse momentum ($p_{\rm T}$) interval $20<p_{\rm T}^{\rm jet,ch}<100$ GeV/$c$. They are also consistent w…
Strength of J(pi)=1(+) Gamow-Teller and isovector spin monopole transitions in double-beta-decay triplets
2014
In this work we study systematically the energetics and intensity distributions of Gamow-Teller (GT ± )and isovector spin monopole (IVSM ± ) transitions from the ground states of the pairs ( 76 Ge, 76 Se), ( 82 Se, 82 Kr), ( 100 Mo, 100 Ru), ( 116 Cd, 116 Sn), ( 128 Te, 128 Xe), ( 130 Te, 130 Xe), and ( 136 Xe, 136 Ba), of double-beta-decay initial and final nuclei, to the J π = 1 + excited states of the intermediate odd-odd nuclei 76 As, 82 Br, 100 Tc, 116 In, 128 , 130 I, and 136 Cs. We use a proton-neutron quasiparticle random-phase approximation (QRPA) theory framework with the Bonn-A two-body interaction in large no-core single-particle valence bases. Our studies indicate that the GT −…
Forme e Funzioni degli Elementi Tecnici nell'Architettura Contemporanea
2007
Il libro illustra, attraverso la rilettura critica e la rielaborazione grafica di particolari costruttivi relativi ad alcuni degli edifici contemporanei maggiormente significativi del panorama architettonico internazionale, forme e funzioni degli elementi tecnici caratterizzanti essenzialmente, e per materiali e per configurazione, l’involucro di tali edifici. In particolare vengono descritti gli elementi e/o gli strati funzionali che entrano in gioco nella definizione di elementi tecnici come pareti perimetrali verticali, coperture, infissi esterni, ma anche solai, controsoffitti, pavimenti sopraelevati, ecc evidenziando, attraverso lo schema di classificazione del sistema tecnologico dell…