This paper summarizes a mathematical model for characterizing hysteresis in ferroelectric materials. The model is based on the quanti cation of energy required to bend and translate domain walls and is developed in two steps. In the rst, the underlying anhysteretic polarization is quanti ed through constitutive equations derived using Boltzmann statistics. Three anhysteretic models are consider...

Gradient Boosting Decision Tree (GBDT) is a popular machine learning algorithm, and has quite a few effective implementations such as XGBoost and pGBRT. Although many engineering optimizations have been adopted in these implementations, the efficiency and scalability are still unsatisfactory when the feature dimension is high and data size is large. A major reason is that for each feature, they...

Active filters provide significant harmonic and reactive power compensation and are thereby widely accepted as devices for power quality enhancement.. Many research works have been done to improve the dynamic performance of active filters. Current research work focuses on implementing a Minimally Switched Shunt Active Power filter for power quality enhancement. Minimally switched grid interacti...

This paper discusses in details a control design approach for hysteretic systems with dynamics. The framework is quite general to embrace several unconventional actuators. In particular, we here propose a method which allows the exploitation of the particular hysteresis characteristic of a specific class of actuators based on magnetic shape memory alloys, namely the so-called push-push actuator...

Goss polynomials provide a substitute of trigonometric functions and their identities for the arithmetic of function fields. We study the Goss polynomials Gk(X) for the lattice A = Fq[T ] and obtain, in the case when q is prime, an explicit description of the Newton polygon NP (Gk(X)) of the k-th Goss polynomial in terms of the q-adic expansion of k − 1. In the case of an arbitrary q, we have s...

We have used a novel device structure to study optical enhancement and back reflectors (BRs) in a-Si n-i-p solar cells by separating the effects of substrate texture, BR texture, and BR reflectivity. QE and diffuse and total reflection are compared for devices on smooth or textured substrates, with smooth or textured BRs. There is little improvement in J,, for substrate hare exceeding 5%. Subst...

Article history: Received 28 October 2015 Received in revised form 8 April 2016 Accepted 9 April 2016 Communicated by David Goss MSC: primary 11E39 secondary 11E12, 11E20

Article history: Received 18 November 2009 Revised 6 January 2011 Accepted 15 March 2011 Available online xxxx Communicated by David Goss MSC: primary 11N05 secondary 11M38, 11G05