Kitaev spin models from topological nanowire networks

We show that networks of topological nanowires can realize the physics of exactly solvable Kitaev spin models with two-body interactions. This connection arises from the description of the low-energy theory of both systems in terms of a tight-binding model of Majorana modes. In Kitaev spin models the Majorana description provides a convenient representation to solve the model, whereas in an array of topological nanowires it arises, because the physical Majorana modes localized at wire ends permit tunnelling between wire ends and across different Josephson junctions. We explicitly show that an array of junctions of three wires -- a setup relevant to topological quantum computing with nanowires -- can realize the Yao-Kivelson model, a variant of Kitaev spin models on a decorated honeycomb lattice. Translating the results from the latter, we show that the network can be constructed to give rise to collective states characterized by Chern numbers \nu = 0, +/-1 and +/-2, and that defects in an array can be associated with vortex-like quasi-particle excitations. Finally, we analyze the stability of the collective states as well as that of the network as a quantum information processor. We show that decoherence inducing instabilities, be them due to disorder or phase fluctuations, can be understood in terms of proliferation of the vortex-like quasi-particles.Comment: 15 pages, 9 figure

Metric Structure of the Space of Two-Qubit Gates, Perfect Entanglers and Quantum Control

We derive expressions for the invariant length element and measure for the simple compact Lie group SU(4) in a coordinate system particularly suitable for treating entanglement in quantum information processing. Using this metric, we compute the invariant volume of the space of two-qubit perfect entanglers. We find that this volume corresponds to more than 84% of the total invariant volume of the space of two-qubit gates. This same metric is also used to determine the effective target sizes that selected gates will present in any quantum-control procedure designed to implement them.Comment: 27 pages, 5 figure

Graphical Calculus for the Double Affine Q-Dependent Braid Group

We define a double affine $Q$-dependent braid group. This group is constructed by appending to the braid group a set of operators $Q_i$, before extending it to an affine $Q$-dependent braid group. We show specifically that the elliptic braid group and the double affine Hecke algebra (DAHA) can be obtained as quotient groups. Complementing this we present a pictorial representation of the double affine $Q$-dependent braid group based on ribbons living in a toroid. We show that in this pictorial representation we can fully describe any DAHA. Specifically, we graphically describe the parameter $q$ upon which this algebra is dependent and show that in this particular representation $q$ corresponds to a twist in the ribbon

O papel do Enfermeiro Veterinário no acondicionamento e envio de amostras para o laboratório

In the present work, the main situations in which recourse to the laboratory is fundamental, are listed, as well as the main methods of taking samples from live animal and its execution. The main risks which compromise the quality and reliability of laboratory diagnosis, are related with incorrect methods of sampling, little information on their respective request records or its incorrect filled, also with failures in packing and sending samples to the laboratory, as well as the absence of indications to the correct orientation of the surgical specimens. Also, the main rules of conduct and best practices, which the Veterinary Nurse could help to implement in clinical practice, will be identified, with the goal to contribute to the minimization of laboratory error.à Fundação Portuguesa para a Ciência e Tecnologia, ao Centro de Estudos em Educação, Tecnologias e Saúde e ao projeto estratégico PEst-OE/CED/UI4016/201

Kitapçılığımıza dair

Taha Toros Arşivi, Dosya No:111-Kütüphaneler. Not: Gazetenin "Akşamdan Akşama" köşesinde yayımlanmıştır.İstanbul Kalkınma Ajansı (TR10/14/YEN/0033) İstanbul Development Agency (TR10/14/YEN/0033

Energy recovery of waste

První část této práce shrnuje problémy vyplývající z nadměrné produkce odpadů a porovnává různé způsoby a technologie jeho zneškodnění. Druhá část práce se zaměřuje na jednu z těchto možností a to spalování odpadů s následným využitím energie. Jsou zde probrána specifika a možnosti této technologie a následně je popsán její stav v České republice.The first part of this thesis sums up problems arising from waste production and compares different ways and technologies of waste treatment. Second part of this thesis focuses on one of these ways, on the incineration of waste with energy recovery. It discusses specifics and possibilities of this technology and describe current situation in the Czech Republic.

50 yıl sonra Tevfik Fikret

Taha Toros Arşivi, Dosya No: 98/A-Tevfik Fikretİstanbul Kalkınma Ajansı (TR10/14/YEN/0033) İstanbul Development Agency (TR10/14/YEN/0033)Ne dramı:Papaz Haluk'un babası olmak!Tevfik Fikret'in Abdülhamid'e karşı tutumu:Önce öğmek sonra söğme