Flatness-based control of a single qubit gate

This work considers the open-loop control problem of steering a two level quantum system from an initial to a final condition. The model of this system evolves on the state space SU(2), having two inputs that correspond to the complex amplitude of a resonant laser field. A symmetry preserving flat output is constructed using a fully geometric construction and quaternion computations. Simulation results of this flatness-based open-loop control are provided.Comment: Submitted to IEEE AC. Simulation code available at http://cas.ensmp.fr/~rouchon/publications/PR2007/CodeMatlabScilabQubit.zi

A Time-Periodic Lyapunov Approach for Motion Planning of Controllable Driftless Systems on SU(n)

For a right-invariant and controllable driftless system on SU(n), we consider a time-periodic reference trajectory along which the linearized control system generates su(n): such trajectories always exist and constitute the basic ingredient of Coron's Return Method. The open-loop controls that we propose, which rely on a left-invariant tracking error dynamics and on a fidelity-like Lyapunov function, are determined from a finite number of left-translations of the tracking error and they assure global asymptotic convergence towards the periodic reference trajectory. The role of these translations is to avoid being trapped in the critical region of this Lyapunov-like function. The convergence proof relies on a periodic version of LaSalle's invariance principle and the control values are determined by numerical integration of the dynamics of the system. Simulations illustrate the obtained controls for $n=4$ and the generation of the C--NOT quantum gate.Comment: Submitte

Citizens in the making: a contribution to children's environmental health education

As ações educativas têm especial papel na conformação do cidadão e na mudança da qualidade de vida e saúde. Apresenta-se o relato de experiência de educação em saúde, realizada no Programa de Saúde da Família por Agentes Comunitários de Saúde, tendo como alvo crianças e como tema o meio ambiente. Os objetivos são: despertar para o sentido do que é ser um cidadão, partindo da noção de direitos e deveres das crianças; convidar as crianças, de forma lúdica e prazerosa, a refletirem sobre a necessidade do cuidado com a saúde do corpo e do meio ambiente; possibilitar o conhecimento e a visualização de alguns agentes causadores de doenças comuns nas crianças da comunidade. A proposta é desenvolvida em três encontros básicos, por meio da apresentação de duas peças de teatro infantil, de um passeio à comunidade com crianças e professores e da improvisação de um laboratório para visualização de animais comuns. Os resultados apontam que pais e professores relatam mudanças de comportamento das crianças com relação ao cuidado com a higiene pessoal e com o meio ambiente, cobrando também dos adultos o mesmo cuidado. O passeio na comunidade com professores e crianças propicia um novo olhar das crianças sobre o seu entorno e, para os novos professores, muitas vezes um primeiro olhar sobre a comunidade. Recomendação: por meio da ação educativa pautada no diálogo, é possível ter uma criança capaz de modificar o meio em que vive, conhecedora de seus direitos e deveres e, sobretudo, um cidadão em formação.Educational activities have a special role in the consolidation of citizenship as well as in promoting changes in the quality of life and health. This paper presents a report on community-based health agents' experiences of environmental health education directed towards children within a Primary Health Care Center's Family Health Strategy. The objectives of this activity are to: develop a notion of children's rights and duties thus fostering awareness of citizenship; invite children, in a pleasant and playful manner, to reflect upon the need to take care of their bodies and the environment; familiarize them with and help them to visualize some of the agents that frequently cause diseases among children in their community. Description: this proposal is undertaken in three encounters, through the presentation of two children's plays, a walk with children and teachers in the community and the improvisation of a laboratory, set up so that the children can visualize small animals. As a result, parents and teachers report modifications in children's behavior concerning personal hygiene and environmental care, and the children start to demand that adults adopt similar attitudes. The walk in the community provides the children with a new perspective on their surroundings and helps new teachers to gain a perspective on the school's community. Recommendation: through educational action based on dialogue, it is possible for children to gain the capacity to modify their environment and become familiar with their rights and duties. Above all, it contributes towards their sense of citizenship

N,N′,N′′-Triphenyl­guanidinium 5-nitro-2,4-dioxo-1,2,3,4-tetra­hydro­pyrimidin-1-ide

In the title compound, C19H18N3 +.C4H2N3O4 −, the dihedral angles between the phenyl rings and the plane defined by the central guanidinium fragment are in the range 41.3 (1)–66.6 (1)°. The pyrimidine ring of the anion is distorted towards a boat conformation and the nitro group is rotated 11.4 (2)° out of the uracil plane. Hydrogen bonds assemble the ions in infinite helical chains along the b axis

Bis(triphenyl­guanidinium) tetra­chlorido­cuprate(II)

The structure of the title compound, (C19H18N3)2[CuCl4], consists of square-planar [CuCl4]2− anions and triphenyl­guanidinium cations. The CuII ion occupies a crystallographic inversion centre. In the cation, the dihedral angles between the phenyl rings and the plane defined by the central guanidinium fragment are in the range 51.9 (4)–64.4 (3)°. N—H⋯Cl hydrogen bonds assemble the ions into infinite chains running along the b axis

Predicted defect induced vortex core switching in thin magnetic nanodisks

We investigate the influence of artificial defects (small holes) inserted into magnetic nanodisks on the vortex core dynamics. One and two holes (antidots) are considered. In general, the core falls into the hole but, in particular, we would like to remark an interesting phenomenon not yet observed, which is the vortex core switching induced by the vortex-hole interactions. It occurs for the case with only one hole and for very special conditions involving the hole size and position as well as the disk size. Any small deformation in the disk geometry such as the presence of a second antidot changes completely the vortex dynamics and the vortex core eventually falls into one of the defects. After trapped, the vortex center still oscillates with a very high frequency and small amplitude around the defect center.Comment: 11pages, Revtex format, 17 figure

Guanidinium 4-amino­benzoate

In the title compound, CH6N3 +·C7H6NO2 −, the cation and anion lie on crystallographic mirror planes. The 4-amino­benzoate anion is almost in a planar conformation with a maximum deviation of 0.024 (2) Å for the N atom. The bond length in the deprotonated carboxyl group is inter­mediate between those of normal single and double Csp2=O bonds, indicating delocalization of the charge over both O atoms of the COO− group. In the crystal, N—H⋯O hydrogen bonds assemble the ions in layers propagating in the bc plane. This structure is very similar to that of guanidinium benzoate

Fasting Glucose Metabolism in Pregnancy

The HAPO study found a continuous association between hyperglycemia at 24-32 weeks of gestation, below the diagnostic levels of gestational diabetes mellitus (GDM), and adverse pregnancy outcomes, suggesting the need to reconsider the diagnostic criteria for GDM. Recently, a consensus for diagnosis of diabetes in pregnancy was published, based on the results of the HAPO study. Diagnosing for diabetes is considered already in the first trimester with fasting plasma glucose (FPG), but oral glucose tolerance test is recommended to be performed only at 24-28 weeks of gestation. Identifying all pregnant women at risk for GDM in the first trimester would allow an individualization of obstetric care and establishment of a dietetic and exercise plan since earlier stages of pregnancy with potential benefits for both mother and fetus. The glycemic metabolism varies throughout pregnancy, as insulin resistance increases during pregnancy. However the cut-off values for blood glucose tests in screening and diagnosing GDM are independent of gestational age. The objectives of this study are to verify if the pregnant women with and without GDM diagnosed in the second/third trimester are already different from each other in the first trimester regarding FPG levels and to study the evolution of the FPG throughout pregnancy

Estimativas de parâmetros genéticos e fenotípicos em nível de indivíduo em populações segregantes de feijoeiro-comum.

O objetivo desse trabalho foi estimar os parâmetros genéticos e fenotípicos, em nível de indivíduo, de populações segregantes de feijoeiro-comum, grupo carioca, para caracteres de escurecimento e produção de grãos.CONAF