Collective protein modes are expected to be important for facilitating energy transfer in the Fenna-Matthews-Olson (FMO) complex of photosynthetic green sulphur bacteria, however to date little work has focussed on the microscopic details of these vibrations. The nonlinear network model (NNM) provides a computationally inexpensive approach to studying vibrational modes at the microscopic level ...

The pandemic of Covid-19 has invaded in our lives, with multiple and multidimensional challenges. During the close school units Greece at March, teachers were initially used types distance education, while opening schools during June they had to face issues, such as separation classes, observance distances, use medical mask, experiencing a new, unprecedented situation. In this paper, reference ...

The most famous, and simple suboptimal search algorithm is Weighted A∗ (WA∗) (Pohl 1970). Similar to A∗, WA∗ uses two data structures: OPEN and CLOSED. Initially, OPEN contains only the start state and CLOSED is empty. At every iteration, the algorithm chooses the state in OPEN that minimizes the cost function f(n) = g(n)+W ·h(n), where g(n) is the cost of the lowest cost path found so far, fro...

A random-matrix theory is presented for the linewidth of a laser cavity in which the radiation is scattered chaotically. The linewidth is enhanced above the Schawlow-Townes value by the Petermann factor K, due to the nonorthogonality of the cavity modes. The factor K is expressed in terms of a non-Hermitian random matrix, and its distribution is calculated exactly for the case in which the cavi...