Molecular prototypes for spin-based CNOT quantum gates

We show that a chemically engineered structural asymmetry in [Tb2] molecular clusters renders the two weakly coupled Tb3+ spin qubits magnetically inequivalent. The magnetic energy level spectrum of these molecules meets then all conditions needed to realize a universal CNOT quantum gate.Comment: 4 pages, 4 figure

The configurational energy gap between amorphous and crystalline silicon

The crystallization enthalpy of pure amorphous silicon (a-Si) and hydrogenated a-Si was measured by differential scanning calorimetry (DSC) for a large set of materials deposited from the vapour phase by different techniques. Although the values cover a wide range (200-480 J/g), the minimum value is common to all the deposition techniques used and close to the predicted minimum strain energy of relaxed a-Si (240 ± 25 J/g). This result gives a reliable value for the configurational energy gap between a-Si and crystalline silicon. An excess of enthalpy above this minimum value can be ascribed to coordination defects

Ni Iguals ni Banals

Projecte: 2018PID-UB/026Ni iguals ni banals és un projecte col·laboratiu entre estudiants de diferents facultats i presentat com un mètode resolutiu per transmetre informació mèdica a la societat. La idea del projecte sorgeix a partir de l’observació de l’ús incorrecte dels fàrmacs de venda lliure i els riscos derivats del seu consum inadequat. L’ibuprofè i el paracetamol són un claríssim exemple, pel que es decideix fer una intervenció, en forma de campanya educativa, orientada a fomentar un consum responsable d’aquests fàrmacs que es poden adquirir sense recepta mèdica. Una anàlisi de l’entorn mostra que la població jove és la que té menys contacte amb el sistema de salut i, per tant, menys oportunitats de rebre indicacions sobre l’ús correcte dels medicaments. A més, els joves formen part del rang d’edat més propens a realitzar auto-consultes en línia. La forma com Ni iguals ni banals pretén donar resposta al problema del mal ús dels fàrmacs és amb la creació d’un producte audiovisual dirigit a la població jove on es defineixin les indicacions específiques del paracetamol i de l’ibuprofè, així com les conseqüències del seu ús incorrecte a causa de les seves similituds farmacològiques. El material audiovisual elaborat té dos propòsits: 1) seduir a la població diana a través de l’elecció del gènere audiovisual més adient, la síntesi de la informació científica i l’ajust del registre verbal divulgatiu i 2) facilitar la seva difusió a través de les xarxes socials. Així mateix, és un format tancat i revisable per professionals abans de la seva difusió i, per tant, factible per a estudiants de Medicina que encara no són facultatius. Ni iguals ni banals és un exemple clar sobre com es pot combinar la identificació d’un problema real mèdic, la recerca d’informació tant poblacional com bibliogràfica i la col·laboració interdisciplinària, per englobar-ho tot en una dinàmica didàctica, de forma que els estudiants adquireixen habilitats pràctiques a la vegada que es desenvolupen en un ambient transversal

Evaluación del estado nutricional de los pacientes mayores atendidos en una unidad de hospitalización a domicilio Assessment of the nutritional status of elderly patients treated at a home-hospital unit

Objetivos: Establecer el estado nutricional de nuestros pacientes mayores, valorar la utilidad de los distintos parámetros antropométricos y bioquímicos como marcadores de desnutrición y determinar qué variables estudiadas tienen mayor correlación con la malnutrición. Ámbito: Unidad de Hospitalización a Domicilio del Hospital Universitario Arnau de Vilanova de Lleida. Pacientes: 57 pacientes &#8805; 60 años. Media de estancia en nuestra unidad: 12,1 días. Variables: Edad, sexo, grupos según la complejidad de las curas, patología asociada, diagnóstico, motivo de ingreso, tiempo de estancia hospitalaria, intervención quirúrgica practicada, complicaciones durante la estancia en la UHD, peso, talla, PCT, CB, IMC, CMB, albúmina, hemoglobina y RTL. Resultados: Los pacientes de "más edad" presentan una tasa de seroalbúmina (p Goals. To establish the nutritional status of our elderly patients, assess the usefulness of the various anthropometric and biochemical parameters as markers of malnutrition and to determine which of the variables studied have the greatest correlation with malnutrition. Scope: Home Hospital Unit of the Arnau de Vilanova Teaching Hospital in Lerida. Patients: 57 patients &#8805; 60 years. Mean admission to our unit: 12.1 days. Variables: Age, sex, groups by treatment complexity, associated pathology, diagnosis, reason for admission, duration of stay in hospital, surgery performed, complications during the stay at the Home Hospital Unit, weight, height, PCT, AC, BMI, albumin, haemoglobin and RTL. Results: Patients of great age present lower levels of serum albumin (p < 0.005), total proteins (p < 0.001), transferrin (p < 0.03), haemoglobin (p < 0.02) and RTL (p < 0.04) than "younger" elderly patients. Serum albumin and haemoglobin are lower in patients in a complicated post-surgical condition (p < 0.04 and p < 0.02, respectively) and this group is the one with the longest stays (p < 0.001). Those patients with hypoalbuminaemia (74.1%) present lower PCT and RTL (p < 0.02) and a longer stay in hospital (p < 0.01) than those with normal levels of albumin in blood. Patients with anaemia (63.3%) present a lower RTL (p < 0.01) and a greater hospitalization time than those without anaemia. Total proteins (p < 0.0001), albumin (p < 0.004), transferrin (p < 0.003) and RTL (p < 0.005) correlate negatively with age. Albumin (p < 0.001), haemoglobin (p < 0.006) and RTL (p < 0.0001) present a negative correlation with length of hospital stay. Conclusion: The prevalence of global malnutrition is high (51% moderate-severe). The nutritional status worsens with age. The length of hospitalization increases gradually with age, with deterioration in the nutritional status and with complexity of the treatment provided

The configurational energy gap between amorphous and crystalline silicon

The crystallization enthalpy of pure amorphous silicon (a-Si) and hydrogenated a-Si was measured by differential scanning calorimetry (DSC) for a large set of materials deposited from the vapour phase by different techniques. Although the values cover a wide range (200-480 J/g), the minimum value is common to all the deposition techniques used and close to the predicted minimum strain energy of relaxed a-Si (240 ± 25 J/g). This result gives a reliable value for the configurational energy gap between a-Si and crystalline silicon. An excess of enthalpy above this minimum value can be ascribed to coordination defects

Molecule-based microelectromechanical sensors

International audienceIncorporating functional molecules into sensor devices is an emerging area in molecular electronics that aims at exploiting the sensitivity of different molecules to their environment and turning it into an electrical signal. Among the emergent and integrated sensors, microelectromechanical systems (MEMS) are promising for their extreme sensitivity to mechanical events. However, to bring new functions to these devices, the functionalization of their surface with molecules is required. Herein, we present original electronic devices made of an organic microelectromechanical resonator functionalized with switchable magnetic molecules. The change of their mechanical properties and geometry induced by the switching of their magnetic state at a molecular level alters the device’s dynamical behavior, resulting in a change of the resonance frequency. We demonstrate that these devices can be operated to sense light or thermal excitation. Moreover, thanks to the collective interaction of the switchable molecules, the device behaves as a non-volatile memory. Our results open up broad prospects of new flexible photo- and thermo-active hybrid devices for molecule-based data storage and sensors

Alma Mater: 2015/Pavasaris

Proceedings of the 2nd AtMol European Workshop.Quantum coherence and entanglement give resources to enhance the capabilities of computers well beyond those achievable by present-day or even future classical devices. Quantum information processing can be carried out via a combination of two elementary logic operations: unitary rotations of individual qubits and quantum-gate operations that involve at least two coupled qubits. An outstanding challenge for science and technology is to find suitable realizations of these basic elements. In recent years, magnetic molecular clusters have become candidates to implement the quantum computer hardware. Here, we summarize some of the strategies that have been followed to design and synthesize molecular spin qubits and quantum gates. In particular, we show that molecular clusters containing two Tb3+ ions meet all ingredients required to implement a CNOT quantum logic gate. The definition of control and target qubits is based on the strong magnetic anisotropy and the magnetic inequivalence of the two ions, which can be achieved by chemically engineering dissimilar coordination spheres. The magnetic asymmetry also provides a method to realize a SWAP gate in the same cluster. The synthesis of related molecular structures enables a vast choice of quantum-gate designs. Chemically engineered molecular quantum gates can therefore open promising avenues for the realization of scalable quantum computing architectures.This work was partly funded by grants MAT2009–13977-C03 (MOLCHIP), CTQ2009–06959, FIS2008–01240 and FIS2009–13364-C02, from the Spanish MICINN and the Consolider-Ingenio project on molecular nanoscience. Funding from the European Research Council Starting Grant FuncMolQIP (to GA) is also acknowledged. G. A. acknowledges Generalitat de Catalunya for the ICREA Academia prize 2008Peer reviewe