Study of e+e−→ppˉe^+e^- \rightarrow p\bar{p} in the vicinity of ψ(3770)\psi(3770)

Using 2917 $\rm{pb}^{-1}$ of data accumulated at 3.773~$\rm{GeV}$, 44.5~$\rm{pb}^{-1}$ of data accumulated at 3.65~$\rm{GeV}$ and data accumulated during a $\psi(3770)$ line-shape scan with the BESIII detector, the reaction $e^+e^-\rightarrow p\bar{p}$ is studied considering a possible interference between resonant and continuum amplitudes. The cross section of $e^+e^-\rightarrow\psi(3770)\rightarrow p\bar{p}$, $\sigma(e^+e^-\rightarrow\psi(3770)\rightarrow p\bar{p})$, is found to have two solutions, determined to be ($0.059\pm0.032\pm0.012$) pb with the phase angle $\phi = (255.8\pm37.9\pm4.8)^\circ$ ($<$0.11 pb at the 90% confidence level), or $\sigma(e^+e^-\rightarrow\psi(3770)\rightarrow p\bar{p}) = (2.57\pm0.12\pm0.12$) pb with $\phi = (266.9\pm6.1\pm0.9)^\circ$ both of which agree with a destructive interference. Using the obtained cross section of $\psi(3770)\rightarrow p\bar{p}$, the cross section of $p\bar{p}\rightarrow \psi(3770)$, which is useful information for the future PANDA experiment, is estimated to be either ($9.8\pm5.7$) nb ($<17.2$ nb at 90% C.L.) or $(425.6\pm42.9)$ nb

Modification of gesture-determined-dynamic function with consideration of margins for motion planning of humanoid robots

The gesture-determined-dynamic function (GDDF) offers an effective way to handle the control problems of humanoid robots. Specifically, GDDF is utilized to constrain the movements of dual arms of humanoid robots and steer specific gestures to conduct demanding tasks under certain conditions. However, there is still a deficiency in this scheme. Through experiments, we found that the joints of the dual arms, which can be regarded as the redundant manipulators, could exceed their limits slightly at the joint angle level. The performance straightly depends on the parameters designed beforehand for the GDDF, which causes a lack of adaptability to the practical applications of this method. In this paper, a modified scheme of GDDF with consideration of margins (MGDDF) is proposed. This MGDDF scheme is based on quadratic programming (QP) framework, which is widely applied to solving the redundancy resolution problems of robot arms. Moreover, three margins are introduced in the proposed MGDDF scheme to avoid joint limits. With consideration of these margins, the joints of manipulators of the humanoid robots will not exceed their limits, and the potential damages which might be caused by exceeding limits will be completely avoided. Computer simulations conducted on MATLfurther verify the feasibility and superiority of the proposed MGDDF scheme.</jats:p

Análisis del tratamiento para drogodependencias en dos instituciones de Medellín. Integración de elementos esenciales de la clínica y prácticas basadas en evidencia

Se describen y analizan los principales factores que inciden en la eficacia terapéutica del tratamiento de las drogodependencias en dos instituciones en Medellín-Colombia y su relación con los protocolos de atención clínica construidos a partir de los modelos conocidos como Práctica Basada en Evidencia (PBE) y concretamente, Psicología Clínica Basada en la Evidencia (PsClBE). El diseño metodológico fue cualitativo, se recopilaron los datos mediante la técnica de entrevistas semiestructuradas a cuatro psicólogos clínicos y ocho pacientes de estas instituciones (una de modelo clínico y la otra de comunidad terapéutica). El paradigma que se implementó para procesar los datos fue el interpretativo y el análisis de datos incluyó la triangulación a través del software ATLAS.ti7, emergiendo siete categorías de análisis. Los resultados indican que un adecuado uso; flexible y contextualizado de los manuales, guías y protocolos clínicos permite reconocer la subjetividad y la importancia de la empatía, la actitud clínica, entre otros factores que ayudan a establecer vínculos terapéuticos de cooperación que facilitan la realización de actividades de evaluación, diagnóstico e intervención, y con ello el logro de objetivos propuestos por los psicólogos clínicos que laboran en estas instituciones

Ludwik Fleck ja lääketieteellisen ajattelutavan analyysi

Melt quenched high pressure die casting (MQ-HPDC) is a new die casting process developed recently for improving the casting quality of the conventional high pressure die casting (HPDC) process. In the MQ-HPDC process, an alloy melt with a specified dose and superheat is quenched by directly pouring the alloy melt into a preheated metallic container. The thermal mass and preheating temperature of the container is selected so that the alloy melt is quenched just below the alloy liquidus and heterogeneous nucleation takes place during the melt quenching. The quenched alloy melt is then fed immediately into the shot sleeve for component casting. In this paper we present the MQ-HPDC process and the resultant microstructures and mechanical properties of a MQ-HPDC A356 alloy