Inverter-converter automatic paralleling and protection

Electric control and protection circuits for parallel operation of inverter-converte

Fusiform Rust Incidence in Loblolly and Slash Pine Plantations in East Texas

A method to predict the incidence of fusiform rust (Cronartium quercuum [Berk.] Miyabe ex Shirai f. sp. fusiforme) in unthinned loblolly (Pinus taeda L.) and slash pine (Pinus elliotti Englem.) plantations located on non-oldfields in East Texas is presented. In addition, procedures are described to estimate changes in rust incidence over time as: 1. A rust-free tree remains rust free, develops stem or branch galls, or dies. 2. A tree with branch galls remains with branch galls only, develops stem galls, or dies. 3. A tree with stem galls remains with stem galls, or dies. Multinomial logistic regression models utilizing basic plantation parameters as predictors were fit to estimate current rust incidence and, then, the change in rust condition over time. South. J. Appl. For. 15(2):79-84

Predicting Survival of East Texas Loblolly and Slash Pine Plantations Infected with Fusiform Rust

Repeated measurement during 1982-1992 of East Texas Pine Plantation Research Project permanent plots in loblolly( Pinus taedaL .) and slash( Pinus elliottii Engelm.) pine plantations throughout East Texas were used to develop equations for predicting the future number of trees per acre. A typical condition of East Texas pine plantations is the incidence of fusiform rust( Cronatrium quercuum [Berk.] Miyabe ex Shirai f. sp. fusiforme). A regression procedure for fitting nonlinear systems of equations was used to fit survival models that considered the possibility that trees with no rust galls on the stem could either (1) remain uninfected and alive, (2) become infected yet still alive or (3) die. For infected stem so, only two possible outcomes were considered in the model:(1) remain infected and alive or (2) die.Analyses of the differences between predicted and observed values indicated no adverse trends for either of the two species. Apparently the models do represent observed survival patterns.South J. Appl. For. 20(1):30-35

Establishment of permanent growth and yield plots in loblolly and slash pine plantations

Permanent plots have been established in 178 loblolly and 78 slash pine plantations throughout East Texas to study the development of stand structure over time. Analysis of the data will provide methods of estimating growth and yield, mortality, and site productivity to assist managers of these plantations

Site Index Equations for Loblolly and Slash Pine Plantations on Non-Old Fields in East Texas

Equations to estimate site index (index age 25 years) for plantations of loblolly pine (Pinus taeda L.) and slash pine (Pinus elliottii Engelm.) on non-old fields in East Texas have been developed. The height-prediction curves were based on the Richards’ growth function and track well within the range of the data (1-17 years). South. J. Appl. For. 10:109-112, May 1986

Optimal Control Theory Applied to a Difference Equation Model of Cardiopulmonary Resuscitation

Objective: To apply the mathematical techniques of optimal control theory (OCT) to a validated model of the human circulation during cardiopulmonary resuscitation (CPR), so as to discover improved waveforms for chest compression and decompression that maximize the systemic perfusion pressure (SPP). Methods: The human circulatory system is represented by seven difference equations, which describe the pressure changes in systemic vascular compartments caused by chest compression. The forcing term is the intrathoracic pressure generated by the external chest compression, which is taken as the “control” variable for the system. The optimum waveform of this forcing pressure as a function of time, determined from OCT, maximizes the calculated SPP between the thoracic aorta and the superior vena cava over a period of 13.3 sec of continuous chest compression under clinically realistic conditions. Results: The optimal waveform included both compression and decompression of the chest to the maximum allowable extent. Compression-decompression waveforms were rectangular in shape. The frequency of optimal compression-decompression was 90/min. The duty cycle (compression duration / cycle time) was 40 percent. The SPP for the optimum control waveform was 36 mmHg vs. 25 mmHg for standard CPR. Conclusions: OCT suggests that both compression and decompression of the chest are needed for best hemodynamics during CPR

Investigation on the trophic state of the North Sea for three years (1994?1996) simulated with the ecosystem model ERSEM ? the role of a sharp NAOI decline

International audienceApplying the ecosystem model ERSEM to the Northwest-European shelf (48°?63°N, 15°W?12°E) the years 1994-1996 were simulated, which exhibit an extremely strong transition in North Atlantic Oscillation index (NAOI): from a high-NAOI to a low-NAOI regime. In order to be far enough from the boundaries of the model area the results and budgets are focussed on the North Sea area. For this region the model was validated against climatological values of nitrate as representative nutrient. For all three years the North Sea was found to be net heterotrophic: organic material was imported, inorganic material was exported. The strength of this "remineralisation-machine" was large during NAOI-high years (1994 and 1995). It was weaker in 1996 with a low NAOI. This was caused by higher net primary production in the northern North Sea during summer 1996. In this year the stratification was weaker and began later allowing the deep nutrient-rich water in the northern North Sea to be mixed into the upper layers also during early summer

Characterizing Fusiform Rust Incidence and Distribution in East Texas

Three measurement cycles were completed on an extensive network of loblolly( Pinus taeda L.) pine and slash (Pinus elliottii Engelm.) pine plots in industrial plantations throughout East Texas in 1984, 1987, and 1990.Because the incidence of fusiform rust caused by Cronartium quercuum [Berk.] Miyabe ex Shirai f. sp. fusiforme had been recorded at each measurement, it is possible to characterize the temporal and geographic distribution of fusiform rust among these industrial pine plantations in East Texas. Average rust incidence for each species by two year age classes is presented. For loblolly pine, there is no apparent change in overall average incidence between 1987 and 1990, whereas for slash pine, there is an apparent overall average decline of about 7-8 percentage points. For some slash pine age classes, the incidence decline is 20-30 percentage points. Loblolly and slash pine rust incidence maps depict the geographic distribution of rust infection by plantation age groups in East Texas. South. J. Appl. For. 18(1):29-3

Faculty Perceptions and Realities Informing Curricular and Instructional Improvements in Postsecondary STEM Education: Development of Transdisciplinary Curricula, Notions of Successful Students, and the Use of Student-Learning Data

Research has confirmed a lack of diversity and persistence of underrepresented populations in the STEM fields. Recruiting and retaining more women and people of color into STEM fields has long been a goal of higher education, per a notable lack of women and people of color who enter and complete undergraduate degree programs and then pursue STEM careers. Research also confirms that faculty and institutional practices promote (or not) student learning and success. Calls to improve the success of more diverse postsecondary students highlight the need for revisions to postsecondary STEM curriculum and instruction. Per their role, STEM faculty occupy a unique and potentially powerful position to influence whether or not students succeed and persevere in their fields. In this dissertation, I present three manuscripts that collectively explore issues related to STEM faculty realities and perspectives, including factors that motivate and challenge the status quo in STEM classrooms. The research in this dissertation spans two different improvement initiatives across four different postsecondary institutions. It includes the perspectives and realities of 38 postsecondary faculty and leaders in STEM and social science disciplines in examining faculty perspectives related to their teaching improvement efforts and their students' success. Findings from the three manuscripts presented in this dissertation offer novel insights concerning how faculty from multiple disciplines experience and develop a transdisciplinary curriculum, how faculty perceive notions of successful students and their teaching practices that support them, and how faculty instructional data-use practices inform their teaching practices, student learning, and reflection on their learning. I look across the three manuscripts to discuss overarching themes that emerged and provide recommendations for stakeholders (i.e., department leaders, administrators, professional development experts, and others) to support faculty involvement in improvement initiatives, particularly in STEM fields

Mass ivermectin treatment for Onchocerciasis: Lack of evidence for collateral impact on transmission of Wuchereria bancrofti in areas of co-endemicity

There has long been interest in determining if mass ivermectin administration for onchocerciasis has 'unknowingly' interrupted lymphatic filariasis (LF) transmission where the endemicity of the two diseases' overlaps. We studied 11 communities in central Nigeria entomologically for LF by performing mosquito dissections on Anopheline LF vectors. Six of the communities studied were located within an onchocerciasis treatment zone, and five were located outside of that zone. Communities inside the treatment zone had been offered ivermectin treatment for two-five years, with a mean coverage of 81% of the eligible population (range 58–95%). We found 4.9% of mosquitoes were infected with any larval stage of W. bancrofti in the head or thorax in 362 dissections in the untreated villages compared to 4.7% infected in 549 dissections in the ivermectin treated villages (Mantel-Haenszel ChiSquare 0.02, P = 0.9). We concluded that ivermectin annual therapy for onchocerciasis has not interrupted transmission of Wuchereria bancrofti (the causative agent of LF in Nigeria)