The involvement of chromatin remodelling in dormancy cycling in the soil seed bank (SSB) is poorly understood. Natural variation between the winter and summer annual Arabidopsis ecotypes Cvi and Bur was exploited to investigate the expression of genes involved in chromatin remodelling via histone 2B (H2B) ubiquitination/de-ubiquitination and histone acetylation/deacetylation, the repressive his...

It is well known that unconstrained infinite-horizon optimal control may be used to construct a stabilizing controller for a nonlinear system. In this note, we show that similar stabilization results may be achieved using unconstrained finite horizon optimal control. The key idea is to approximate the tail of the infinite horizon cost-to-go using, as terminal cost, an appropriate control Lyapun...

The cluster luminosity function (CLF) is one of the most important diagnostics in the study of old globular and young compact star cluster populations. While the CLFs of young star cluster systems are closely approximated by power laws, as predicted by standard cluster formation models (e.g., [2] [4]), for old globular cluster systems the shape of the CLF, and also of the initial mass function,...

Abstract— This paper considers the trajectory tracking problem for unmanned air vehicles (UAVs). We assume that the UAV is equipped with an autopilot which reduces the twelve degree-of-freedom (DOF) model to a six DOF model with altitude, heading, and velocity command inputs. In this paper we restrict our attention to planar motion. One of the novel features of our approach is that we explicitl...

OBJECTIVE To explore user perceptions of videophone communication in different long-term care settings by comparing interview transcripts of a study involving residents of a congregate living facility (CLF) and family members with findings of a case study involving a resident of a skilled nursing facility (SNF) and family member. METHODS Semistructured interviews by telephone and in person we...

Merging two Control Lyapunov Functions (CLFs) means creating a single “new-born” CLF by starting from two parents functions. Specifically, given a “father” function, shaped by the state constraints, and a “mother” function, designed with some optimality criterion, the merging CLF should be similar to the father close to the constraints and similar to the mother close to the origin. To successfu...

This research aims at developing control law strategies that improve the performances and robustness of electrohydraulic servosystems (EHSS) operation while considering easy implementation. To address strongly nonlinear nature EHSS, a number algorithms based on backstepping approach is intensively used in literature. The main contribution this paper to consider an alternative synthetize Lyapuno...

A constructive tool of nonlinear control systems design, the method of Control Lyapunov Functions (CLF) has found numerous applications in stabilization problems for continuoustime, discrete-time and hybrid systems. In this paper, we address the fundamental question: given a CLF, corresponding to the continuous-time controller with some predefined (e.g. exponential) convergence rate, can the sa...

A short overview on thin film solar cells is given, and the complexity of their electronic structure is illustrated. Several physical mechanisms that give rise to a decay of the capacitance from a low-frequency value CLF to a high-frequency value CHF are discussed. A key of interpreting features in measured admittance spectroscopy (AS) spectra is a careful analysis of CLF and CHF and the temper...

In this work, we propose a methodology for the expression of necessary and sufficient Lyapunov-like conditions for the existence of stabilizing feedback laws. The methodology is an extension of the well-known Control Lyapunov Function (CLF) method and can be applied to very general nonlinear time-varying systems with disturbance and control inputs, including both finite and infinitedimensional ...