Strong CH^+ J = 1–0 emission and absorption in DR21

We report the first detection of the ground-state rotational transition of the methylidyne cation CH^+ towards the massive star-forming region DR 21 with the HIFI instrument onboard the Herschel satellite. The line profile exhibits a broad emission line, in addition to two deep and broad absorption features associated with the DR 21 molecular ridge and foreground gas. These observations allow us to determine a ^(12)CH^(+)J = 1–0 line frequency of ν = 835 137 ± 3 MHz, in good agreement with a recent experimental determination. We estimate the CH^+ column density to be a few 10^(13) cm^(-2) in the gas seen in emission, and >10^(14) cm^(-2) in the components responsible for the absorption, which is indicative of a high line of sight average abundance [CH^+] /[H] > 1.2 × 10^(-8). We show that the CH^+ column densities agree well with the predictions of state-of-the-art C-shock models in dense UV-illuminated gas for the emission line, and with those of turbulent dissipation models in diffuse gas for the absorption lines

Theory of Drop Formation

We consider the motion of an axisymmetric column of Navier-Stokes fluid with a free surface. Due to surface tension, the thickness of the fluid neck goes to zero in finite time. After the singularity, the fluid consists of two halves, which constitute a unique continuation of the Navier-Stokes equation through the singular point. We calculate the asymptotic solutions of the Navier-Stokes equation, both before and after the singularity. The solutions have scaling form, characterized by universal exponents as well as universal scaling functions, which we compute without adjustable parameters

Introduction to empathy: activation, definition, construct

This introduction to the collection offers an initial discussion of the concept of empathy, and its uses in both academic and popular discourse. I aim here to interrogate a general trend, currently observable particularly with reference to educational and corporate settings, in which ‘empathy’ has become somewhat of a buzz-word, an essential component that enhances the ‘human’ quality of the ways in which a company operates, or a curriculum is administered in a classroom. In the literature produced about, or sometimes by these sectors, there is frequent advocacy for the activation of empathy in professional and teacher-student relationships, while concrete definitions of empathy are rarely provided, and often taken for granted. On the other hand, in academic discourse, disciplinary approaches and objectives render it essential for definitions of empathy not only to be thoroughly expounded but also adequately justified in a specific disciplinary (or a specific cross-disciplinary) context. This discussion aims to offer a brief survey of some ways in which the conceptual tension between definitions and practical applications (or activations) of empathy have been, and can continue to be explored. This survey in turn will introduce the featured papers in this collection, initially delivered at a 2013 workshop on ‘Empathy’ at the UCL Joint Faculty Institute of Graduate Studies, contributions which will offer perspectives on socio-cultural, philosophical, artistic, and psychological constructs of empathy, both in its definition and potential activation

NGO Participation In Human Rights Law And Process: Latest Developments In The Effort To Develop An International Treaty On The Rights Of People With Disabilities

The human rights of people with disabilities traditionally have been ignored in mainstream international human rights theory and practice and in the work of international institutions