Development outcomes come in `clusters' that seem difficult to exit. Using original data from Colombia, we present evidence of the interconnection between two critical political components: state weakness and clientelism. ...

Acute muscle weakness (AMW) is a pediatric emergency. During diagnostic approach, it is crucial to obtain a detailed anamnesis, including: onset of weakness, history of associated febrile states, ingestion of toxic ...

We present the first exact calculation of the energy of the bound state of a one dimensional Dirac massive particle in weak short-range arbitrary potentials, using perturbation theory to fourth order (the analogous result ...

In this work an optomechanical system inside a Mach-Zehnder interferometer is studied from the perspective of the weak value amplification effect. The optomechanical system consists of a Fabry-Pérot cavity with a moving ...

We have obtained the perturbative expressions up to sixth order for the energy of the bound state in a one dimensional, arbitrarily weak, short range finite well, applying a method originally developed by Gat and Rosenstein ...