Search results for "SIM"

Radioactivity control strategy for the JUNO detector

2021

JUNO is a massive liquid scintillator detector with a primary scientific goal of determining the neutrino mass ordering by studying the oscillated anti-neutrino flux coming from two nuclear power plants at 53 km distance. The expected signal anti-neutrino interaction rate is only 60 counts per day (cpd), therefore a careful control of the background sources due to radioactivity is critical. In particular, natural radioactivity present in all materials and in the environment represents a serious issue that could impair the sensitivity of the experiment if appropriate countermeasures were not foreseen. In this paper we discuss the background reduction strategies undertaken by the JUNO collabo…

Dzīvnieku tēla interpretācija melnbaltās ilustrācijās

2020

Dzīvnieku mākslas darbi ir atpazīstami jau no seniem laikiem. To tēmas variē no medījuma līdz mājdzīvniekam. Diplomdarba galvenais pētījuma priekšmets ir dzīvnieku tēla interpretācija melnbaltās ilustrācijās. Teorētiskās daļas galvenais uzdevums ir izpētīt dzīvnieka tēla vēsturi un simboliku, kā arī melnbalto ilustrāciju tehnikas. Empīriskās daļas galvenais uzdevums ir analizēt dažādu mākslinieku veidotas dzīvnieka tēla ilustrācijas. Tika secināts, ka dzīvnieku simbolika var atšķirties katrā kultūrā, tomēr ir arī daži vienojošie elementi. Dzīvniekus visbiežāk ilustrācijās attēlo vienus pašus vai ar citiem dzīniekiem, reti ar cilvēkiem. Radošajā daļā tika izveidots grāmatas dizains. Grāmatā …

Diastereo- and enantioselective conjugate addition reactions with α,β-usaturated imines

2017

Objetivos Las iminas α,β-insaturadas (1-azabutenos) han sido frecuentemente utilizadas como moléculas de partida para la síntesis de diferentes compuestos nitrogenados. La adición conjugada de nucleófilos carbonados a este tipo de compuestos es una manera eficiente de formar nuevos enlaces C-C dando lugar a la síntesis de enaminas con formación concomitante de un nuevo centro estereogénico. No obstante, al contrario de lo que sucede con los compuestos carbonílicos insaturados y los nitroalquenos, la adición conjugada enantioselectiva de nucleófilos carbonados a iminas α,β-insaturadas ha sido mucho menos estudiada y en particular, no existían ejemplos de adición asimétrica de compuestos 1,3-…

Alquinilación enantioselectiva de iminas : desarrollo de métodos catalíticos y aplicaciones sintéticas

2013

La adición nucleofílica a los dobles enlaces C=N es uno de los métodos más utilizados para la síntesis de derivados nitrogenados. Sin embargo, supone un desafío sintético debido a la baja electrofilia del átomo de carbono azometínico comparada con la del carbono carbonílico de aldehídos y cetonas. En esta tesis, se ha llevado a cabo la adición enantioselectiva de alquinos terminales a N-(difenilfosfinoil)iminas catalizada por el ligando (R)-(+)-3,3’-dibromo-1,1’-bi-2-naftol y dimetilzinc, obteniéndose enantioselectividades de moderadas a elevadas (hasta 96% ee). La desprotección de las fosfinoil aminas propargílicas sintetizadas se ha llevado a cabo en condiciones suaves compatibles con la …

Evaluating the Authenticity of Virtual Environments: Comparison of Three Devices

2016

Immersive virtual environments (VEs) have the potential to provide novel cost effective ways for evaluating not only new environments and usability scenarios, but also potential user experiences. To achieve this, VEs must be adequately realistic. The level of perceived authenticity can be ascertained by measuring the levels of immersion people experience in their VE interactions. In this paper the degree of authenticity is measured via anauthenticity indexin relation to three different immersive virtual environment devices. These devices include (1) a headband, (2) 3D glasses, and (3) a head-mounted display (HMD). A quick scale for measuring immersion, feeling of control, and simulator sick…

Assisting immersive virtual reality development with user experience design approach

2017

In our study we explored how to design a biography of a late Finnish artist as a VR experience. We conducted a development process assisted by user experience (UX) design methods, which increased the process efficiency, and resulted in a research prototype. Through previous research and our development process, we identified components affecting the user experience. These components are: Immersion, Presence, Disorientation, Sense of Control, Pleasantness, Exploration and Simulator Sickness. From our user study with 13 participants, we were able to draw implications that relate to these components. While the set of components could be incomplete or subject to change, shows that further resea…

The effects of user interface type on player immersion in first-person shooter games

2017

Videopelien vaikutuksia pelaajien käyttäytymiseen on tutkittu laajasti, kuten myös niitä tekijöitä jotka vaikuttavat pelaajien tyytyväisyyteen ja kiinnostukseen videopelejä kohtaan. Tästä huolimatta on puutetta julkisesti saatavilla olevasta empiirisestä tutkimuksesta, joka keskittyisi käyttöliittymän vaikutukseen pelaajan kokemaan immersioon pelin aikana sekä siihen, mikä käyttöliittymissä vaikuttaa immersion kokemuksen syntymiseen. Käyttöliittymät ensimmäisen persoonan kuvakulmasta olevissa videopeleissä voidaan jakaa kahteen eri tyyppiin, diegeettisiin ja epädiegeettisiin käyttöliittymiin. Nämä kaksi eri käyttöliittymätyyppiä saattavat vaikuttaa pelaajan kokemukseen eri tavoin. Parempi y…

Les Cahiers de Marseille et l'architecture du Je. L'"égoisme sans je" ou l'"annihilant" impersonnel

2012

Coupling dynamic simulation and interactive multiobjective optimization for complex problems: An APROS-NIMBUS case study

2014

Dynamic process simulators for plant-wide process simulation and multiobjective optimization tools can be used by industries as a means to cut costs and enhance profitability. Specifically, dynamic process simulators are useful in the process plant design phase, as they provide several benefits such as savings in time and costs. On the other hand, multiobjective optimization tools are useful in obtaining the best possible process designs when multiple conflicting objectives are to be optimized simultaneously. Here we concentrate on interactive multiobjective optimization. When multiobjective optimization methods are used in process design, they need an access to dynamic process simulators, …

Interactions between two parasites of brown trout (Salmo trutta): Consequences of preinfection

2018

Preinfection by one parasitic species may facilitate or by contrast hamper the subsequent penetration and/or establishment of other parasites in a host. The biology of interacting species, timing of preinfection, and dosage of subsequent parasite exposure are likely important variables in this multiparasite dynamic infection process. The increased vulnerability to subsequent infection can be an important and often overlooked factor influencing parasite virulence. We investigated how the preinfection by freshwater pearl mussel Margaritifera margaritifera glochidia could influence the success of subsequent infection by the common trematode Diplostomum pseudospathaceum in brown trout Salmo tru…