We present an experiment addressed to verify the validity of the entanglement quantifier R, defined as the ratio between single counts and coincidence distribution width for pure biphoton states generated by short pump pulses. We demonstrate that this ratio can be efficient to estimate entanglement degree in frequency domain. Our work has been performed with a femto second pulsed laser pump add...

An effective-medium approach is used to derive a set of coupled-mode equations describing quadratic parametric interactions in a one-dimensional inhomogeneous medium of finite length. The solutions for both copropagating and counterpropagating interactions are used to study the quantum-mechanical process of spontaneous parametric down-conversion (SPDC). An example is studied in which the inhomo...

Concerns for environmental issues are important drivers of sustainable and pro-environmental behaviors, and can be differentiated between those with a self-enhancing (egoistic) vs. self-transcendent (biospheric) psychological foundation. Yet to date, the dominant approach for promoting pro-environmental behavior has focused on highlighting the benefits to others or nature, rather than appealing...

* The author is employed at the United Nations Environment Programme’s Regional Office for Europe. The paper is presented by the author in her personal capacity, however, and opinions expressed in this paper should be attributed to the author. They are not meant to represent the positions or opinions of UNEP or the State Parties to the Framework Convention on the Protection of the Marine Enviro...

Abstract Max Alexander has designed an exhibition and science communication project aimed at protecting the near-space environment

The study focused on effect of capacity building programme of development agencies on well being of beneficiaries in Niger Delta Nigeria. Data was collected with the aid of structured questionnaire from 271 randomly selected participants involved in capacity building programmes in Niger Delta area of Nigeria. Data were analysed using mean scores and Z test statistics. Findings revealed that bef...