Combinational logic for generating gate drive signals for phase control rectifiers

Control signals for phase-delay rectifiers, which require a variable firing angle that ranges from 0 deg to 180 deg, are derived from line-to-line 3-phase signals and both positive and negative firing angle control signals which are generated by comparing current command and actual current. Line-to-line phases are transformed into line-to-neutral phases and integrated to produce 90 deg phase delayed signals that are inverted to produce three cosine signals, such that for each its maximum occurs at the intersection of positive half cycles of the other two phases which are inputs to other inverters. At the same time, both positive and negative (inverted) phase sync signals are generated for each phase by comparing each with the next and producing a square wave when it is greater. Ramp, sync and firing angle controls signals are than used in combinational logic to generate the gate firing control signals SCR gate drives which fire SCR devices in a bridge circuit

Parental ADHD Symptomatology and How it Relates to the Parent-Child Relationship and to Social Skills Acquisition in Children

The objective of this study was to examine the relationship between parental Attention Deficit/Hyperactivity Disorder (ADHD) as related to parent/child relationships and the child’s acquisition of social skills. An extensive literature review revealed no research directly related to the question of the effect of ADHD behaviors as they relate to parenting skills and development of social skills in the children of parents who may present with higher levels of ADHD symptoms. Subjects were forty-seven parents and their biological children. Parents completed the Conner’s Ad\ilt ADHD Rating Scale-Self-Report: Lx)ng (CAARS-S:L), the Parenting Relationship Questionnaire - Child and Adolescent (PRQ-CA) and a demographic questionnaire. Participating children completed the Social Skills Rating System (SSRS). Findings of this study suggested that there was a significant relationship between a child’s social skills development and the adult’s parenting skills, which proved to be more influential than the level of ADHD related behaviors that the parent may endorse

Nothing is better than being unfaithful in multiple ways

National Institutes of Health DC00433, RR7031K, DC00076, DC001694 (PI: Gierut

Weighted Constraints and Faithfulness Cumulativity in Phonological Acquisition

National Institutes of Health DC00433, RR7031K, DC00076, DC001694 (PI: Gierut)This article was first published in Proceedings of the 33rd annual Boston University Conference on Language Developement, ed. J. Chandlee et al., Somerville, MA: Cascadilla Press

Historical Agriculture and Soil Erosion in the Upper Mississippi Valley Hill Country

"This thought-provoking book demonstrates how processes of landscape transformation, usually illustrated only in simplified or idealized form, play out over time in real, complex landscapes. Trimble illustrates how a simple landscape disturbance, generated in this case by agriculture, can spread an astonishing variety of altered hydrologic and sed

An opacity-tolerant conspiracy in phonological acquisition

National Institutes of Health DC00433, RR7031K, DC00076, DC001694 (PI: Gierut

Developmental shifts in phonological strength relations

National Institutes of Health DC00433, RR7031K, DC00076, DC001694 (PI: Gierut

Reevaluation and analysis of neutron spectra in liquid hydrogen Final report

Neutron spectra for various thicknesses of liquid hydroge

Illuminating dark matter and primordial black holes with interstellar antiprotons

Interstellar antiproton fluxes can arise from dark matter annihilating or decaying into quarks or gluons that subsequently fragment into antiprotons. Evaporation of primordial black holes also can produce a significant antiproton cosmic-ray flux. Since the background of secondary antiprotons from spallation has an interstellar energy spectrum that peaks at \sim 2\gev and falls rapidly for energies below this, low-energy measurements of cosmic antiprotons are useful in the search for exotic antiproton sources. However, measurement of the flux near the earth is challenged by significant uncertainties from the effects of the solar wind. We suggest evading this problem and more effectively probing dark-matter signals by placing an antiproton spectrometer aboard an interstellar probe currently under discussion. We address the experimental challenges of a light, low-power-consuming detector, and present an initial design of such an instrument. This experimental effort could significantly increase our ability to detect, and have confidence in, a signal of exotic, nonstandard antiproton sources. Furthermore, solar modulation effects in the heliosphere would be better quantified and understood by comparing results to inverse modulated data derived from existing balloon and space-based detectors near the earth.Comment: 18 pages, 3 figure