University of Houston

About: University of Houston is a education organization based out in Houston, Texas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 23074 authors who have published 53903 publications receiving 1641968 citations.

Estimating the number of American children living in partner-violent families.

Abstract: The number of American children living in partner-violent households was estimated from a nationally representative sample of 1,615 dual-parent households. Approximately 15.5 million American children were estimated to live in families in which partner violence had occurred at least once in the previous year, with 7 million estimated to live in families in which severe partner violence had occurred. The prevalence of partner violence was higher among couples with children than among couples without children.

Subplantation model for film growth from hyperthermal species: Application to diamond.

Abstract: A model for film growth from hyperthermal (\ensuremath{\approxeq}1--${10}^{3}$ eV) species impinging on substrates is proposed. The process includes subsurface implantation, energy loss, preferential displacement of atoms with low displacement energies (${E}_{d}$) leaving high ${E}_{d}$ atoms undisplaced, and sputtering of substrate material. Epitaxial growth and preferred orientation result from the angular dependence of the ${E}_{d}$ and the host mold effect. The model, supported by ion trajectory calculations and experimental data, is applied to diamond film formation from ${\mathrm{C}}^{+}$ ions.

Tracking control of a piezoceramic actuator with hysteresis compensation using inverse Preisach model

Abstract: This paper presents the classical Preisach hysteresis modeling and tracking control of a curved pre-stressed piezoceramic patch actuator system with severe hysteresis The actuator is also flexible with very small inherent damping It has potential applications in active antennas A series of tests are conducted to study the hysteresis properties of the piezoceramic actuator system The numerical expressions of the classical Preisach model for different input variations are presented The classical Preisach model is applied to simulate the static hysteresis behavior of the system Higher order hysteresis reversal curves predicted by the classical Preisach model are verified experimentally The good agreement found between the measured and predicted curves showed that the classical Preisach model is an effective mean for modeling the hysteresis of the piezoceramic actuator system Subsequently, the inverse classical Preisach model is established and applied to cancel the hysteresis the piezoceramic actuator system for the real-time microposition tracking control In order to improve the control accuracy and to increase damping of the actuator system, a cascaded PD/lead-lag feedback controller is designed with consideration of the dynamics of the actuator In the experiments, two cases are considered, control with major loop hysteresis compensation, and control with minor loop hysteresis compensation Experimental results show that RMS tracking errors are reduced by 50% to 70% if the hysteresis compensation is added in the feedforward path in both cases Therefore, hysteresis compensation with the feedback controller greatly improves the tracking control accuracy of the piezoceramic actuator

US Cosmic Visions: New Ideas in Dark Matter 2017: Community Report

Abstract: This white paper summarizes the workshop "U.S. Cosmic Visions: New Ideas in Dark Matter" held at University of Maryland on March 23-25, 2017.