Molecular spintronics using noncollinear magnetic molecules

We investigate the spin transport through strongly anisotropic noncollinear magnetic molecules and find that the noncollinear magnetization acts as a spin-switching device for the current. Moreover, spin currents are shown to offer a viable route to selectively prepare the molecular device in one of two degenerate noncollinear magnetic states. Spin-currents can be also used to create a non-zero density of toroidal magnetization in a recently characterized Dy_3 noncollinear magnet.Comment: 4 pages, 3 figures, submitted to Phys. Rev. Let

Complete spectrum of the infinite-UU Hubbard ring using group theory

We present a full analytical solution of the multiconfigurational strongly-correlated mixed-valence problem corresponding to the $N$-Hubbard ring filled with $N-1$ electrons, and infinite on-site repulsion. While the eigenvalues and the eigenstates of the model are known already, analytical determination of their degeneracy is presented here for the first time. The full solution, including degeneracy count, is achieved for each spin configuration by mapping the Hubbard model into a set of Huckel-annulene problems for rings of variable size. The number and size of these effective Huckel annulenes, both crucial to obtain Hubbard states and their degeneracy, are determined by solving a well-known combinatorial enumeration problem, the necklace problem for $N-1$ beads and two colors, within each subgroup of the $C_{N-1}$ permutation group. Symmetry-adapted solution of the necklace enumeration problem is finally achieved by means of the subduction of coset representation technique [S. Fujita, Theor. Chim. Acta 76, 247 (1989)], which provides a general and elegant strategy to solve the one-hole infinite-$U$ Hubbard problem, including degeneracy count, for any ring size. The proposed group theoretical strategy to solve the infinite-$U$ Hubbard problem for $N-1$ electrons, is easily generalized to the case of arbitrary electron count $L$, by analyzing the permutation group $C_L$ and all its subgroups.Comment: 31 pages, 4 figures. Submitte

Assessing water reservoirs management and development in Northern Vietnam

Abstract. In many developing countries water is a key renewable resource to complement carbon-emitting energy production and support food security in the face of demand pressure from fast-growing industrial production and urbanization. To cope with undergoing changes, water resources development and management have to be reconsidered by enlarging their scope across sectors and adopting effective tools to analyze current and projected infrastructure potential and operation strategies. In this paper we use multi-objective deterministic and stochastic optimization to assess the current reservoir operation and planned capacity expansion in the Red River Basin (Northern Vietnam), and to evaluate the potential improvement by the adoption of a more sophisticated information system. To reach this goal we analyze the historical operation of the major controllable infrastructure in the basin, the HoaBinh reservoir on the Da River, explore re-operation options corresponding to different tradeoffs among the three main objectives (hydropower production, flood control and water supply), using multi-objective optimization techniques, namely Multi-Objective Genetic Algorithm. Finally, we assess the structural system potential and the need for capacity expansion by application of Deterministic Dynamic Programming. Results show that the current operation can only be relatively improved by advanced optimization techniques, while investment should be put into enlarging the system storage capacity and exploiting additional information to inform the operation

Custo de um surto da Doença de Aujeszky em uma granja de suínos.

bitstream/item/68427/1/DMeu-DiscoCNPSA-COM.-TEC.-124-87CNPSA-COM.-TEC.-124-87.pd

A dynamic distention protocol for whole-organ bladder decellularization: histological and biomechanical characterization of the acellular matrix

A combined physical\u2013chemical protocol for whole full-thickness bladder decellularization is proposed, based on organ cyclic distention through repeated infusion/withdrawal of the decellularization agents through the urethra. The dynamic decellularization was intended to enhance cell removal efficiency, facilitating the delivery of detergents within the inner layers of the tissue and the removal of cell debris. The use of mild chemical detergents (hypotonic solution and non-ionic detergent) was employed to limit adverse effects upon matrix 3D ultrastructure. Inspection of the presence of residual DNA and RNA was carried out on decellularized matrices to verify effective cell removal. Histological investigation was focused on assessing the retention of adequate structural and functional components that regulate the biomechanical behaviour of the acellular tissue. Biomechanical properties were evaluated through uniaxial tensile loading tests of tissue strips and through ex vivo filling cystometry to evaluate the whole-organ mechanical response to a physiological-like loading state. According to our results, a dynamic decellularization protocol of 17 h duration with a 5 ml/min detergent infusion flow rate revealed higher DNA removal efficiency than standard static decellularization, resulting in residual DNA content\u2009<\u200950 ng/mg dry tissue weight. Furthermore, the collagen network and elastic fibres distribution were preserved in the acellular ECM, which exhibited suitable biomechanical properties in the perspective of its future use as an implant for bladder augmentation

The impact of window operation assumptions on the thermal simulation results of an office building

Buildings' actual energy performance frequently does not meet the expectations at the design phase. One of the potential reasons for the discrepancy between expected and actual energy performance may be the uncertainties associated with building occupants' presence and behavior (e.g., operation of windows, blinds, luminaires). In this paper, we investigate the implications of different occupancy-related assumptions (pertaining to presence and window operation) on the predicted heating and cooling loads of a sample office building in Turin, Italy. Specifically, we deploy a dynamic numeric simulation application to compare standard occupancy models with probabilistic models in view of the computationally predicted heating and cooling demand of the building

The impact of window operation assumptions on the thermal simulation results of an office building

Buildings' actual energy performance frequently does not meet the expectations at the design phase. One of the potential reasons for the discrepancy between expected and actual energy performance may be the uncertainties associated with building occupants' presence and behavior (e.g., operation of windows, blinds, luminaires). In this paper, we investigate the implications of different occupancy-related assumptions (pertaining to presence and window operation) on the predicted heating and cooling loads of a sample office building in Turin, Italy. Specifically, we deploy a dynamic numeric simulation application to compare standard occupancy models with probabilistic models in view of the computationally predicted heating and cooling demand of the building

AIGO research output: A potential matter for postgraduate non-academic hospital specialist training in gastroenterology

We collected, for each active AIGO member, surname, initials of the first name, institutional affiliation (including city), Open Researcher and contributor ID (ORCID). These data were used to identify their published articles, namely research articles, reviews, letters and editorials, from January 1, 1980 to January 20, 2020. Bibliographic research was done using the Web of Science (WOS) database [6] . ORCID and city data were used as search terms only for AIGO members with common names