Presently, SiC Schottky diodes are commercially available up to 1200 V/50 A or 600 V/20 A. Accurate device models are required to evaluate the performance of SiC Schottky diodes in different applications and guide system design. So far several models have been developed for SiC Schottky diodes, most of them based either on device physics or on experimental behavior. Physics-based models provide more accuracy but at a cost: they usually require a number of device parameters to be used in the model, sometimes the model itself is complicated, and may have convergence issues or require a long computation time. Behavioral models require less time for simulation but a large number of experiments are needed for parameter extraction and sometimes the parameter extraction process is complicated and requires the use of dedicated parameter extraction software, such as DIode Model Parameter extrACtion Tools (DIMPACT) [ 13 ].
While many advances were made in lighting technology over time, the continued production of solid-state lighting materials containing rare earths is in jeopardy. It is projected that rare-earth oxide demand will surpass the supply of rare-earth oxide materials. Furthermore, China controls approximately 97% of the global market. The export of these materials will also decrease due to China’s own growing demand. This supply and demand situation for rare-earth materials may eventually cause lighting research to focus more and more on the development of rare-earth free lighting materials and/or organic light emitting devices (OLEDs) 6 . A 2011 report by Philips Lighting Company, showed the critical need for rare-earths oxides to sustain the global demand for lighting materials. The main rare earth ions needed for phosphor materials are
Participants were recruited to participate in a project including longitudinal studies of the development of FXS at the University of North Carolina at Chapel Hill. The aim of the larger project was concerned with investigating the cognitive, behavioral, and psychological trajectories of children with FXS. Data for the current sample were pulled from two studies associated with previously mentioned project in order to address the longitudinal research questions of the study. The first study included boys with FXS who were seen every twelve months for an assessment (n=20). The second study included boys with FXS and typically developing boys seen every eighteen months for assessment (FXS n= 13; TD n= 17). Participants’ data were pulled from the relevant assessment ages, between ages 3 to 4 for the initial assessment (“preschool age”) and then again between ages 5 to 6 for the subsequent assessment (“school entry”). Subjects were used from both samples to increase the power of the potential findings in the analyses.
This study was designed to gather data on teachers’ perceptions of instructional coaching. It relied on the perceptions of teachers for instructional coaching not only for them as individual teachers but also for their school as a whole. The results of the study showed teachers perceive instructional coaches collaborating with teachers to address school-wide instructional concerns and practices as occurring most frequently to impact their classroom practices. Instructional coaches modeling instructional practices in teachers’ classrooms occurs the least frequently. Each of the four instructional coaching best practices had a mean below the “usually” response rating but above the “sometimes” response rating. This finding suggests cohesiveness among the study’s participants on their perceptions of instructional coaching, regardless of the school or school district in which the teacher works. This finding further suggests instructional coaches are either ineffective with their implementation of instructional coaching best practices or that they are not utilizing instructional coaching best practices. The reasons for these deficiencies cannot be concluded from this study. The findings of this study could lead to the
In the following chapter, FRAPCON3.4-USC1.3 is benchmarked against COMSOL and known data from the Fort St. Vrain reactor. COMSOL is a multiphysics-based simulation software capable of a high degree of user customization. In particular, it affords us the ability to benchmark and test a model for which little data exists. And because no known data is available for the interactive behavior of these three materials (UC, SiC, He), COMSOL is ideal. Its use grants us the capacity to not only compare the coolant conditions, but the temperature profile across the fuel for a given time and axial location with a high degree of accuracy.
Advocates of the disability community are not alone in their concern about the potential negative effects of NIPT on the reproductive trends of the population. Many worry there could be unintended consequences. One such concern is that the risk-free and simple process of NIPT will lead to the routinization of the test. In other words, NIPT may become a standard test that most women uptake simply because other women uptake and thus it seems “normal”. While this might increase efficiency and improve uptake, routinization could potentially undermine the decision-making process (Deans & Newson, 2011). Others feel alarmed by the reproductive power NIPT offers and wonder if in the future, a fetus might have to meet certain standards of desirable traits to qualify for birth. One ethicist suggested that potentially “every pregnancy becomes a ‘tentative pregnancy’ pending the results of prenatal screening” (Benn & Chapman, 2010, p. 131).
Generally, there are two classes of metallocene polymers: side-chain metallocene- containing polymers with the metallocene unit as a pendant group, and main-chain metallocene-containing polymers with the metallocene as an integral part of polymer backbone. 18 Earlier studies of ferrocene-functionalized polymers were focused on side- chain polymers such as poly(vinylferrocene) due to facile electrophilic substitution of ferrocene. A few acrylate and methacrylate monomers have been polymerized by conventional techniques such as free radical, cationic, and anionic polymerization. 31-38 However, most of these organometallic polymers developed in the 1970s and 1980s lacked control on molecular weight, molecular weight distribution, and were incapable of producing advanced topology such as block copolymers. Since then, side-chain ferrocene-containing polymers have been much less explored. Meanwhile, a seminal work on strained, ring-tilted metallocenophanes reported by Manners and coworkers in the early 1990s opened a new era in the field of ferrocene-containing polymers, that is, to develop well-defined high molecular weight main-chain ferrocene-containing polymers by anionic ring-opening polymerization. 39 This field has been flourishing over the last two decades. 40, 41 A variety of main-chain ferrocene-containing polymers have been developed. These ferrocene-containing polymers have found applications in magnetic ceramics, variable refractive index sensors, nonlinear optical materials, plasma etch resistant materials, etc. 42, 43
Agrarians and Aristocrats (1981) offers a broad intellectual interpretation of the Jackson- era that characterizes the partisan divide as representative of a rift between two opposing “worldviews,” which Ashworth defines as an intellectual bundle “comprised of beliefs, fears, hopes, and a series of assumptions about government, society and the economy.” 7 The ideologies and policies of the opposing parties emanated from two conflicting perceptions of human society. The Democrats, he suggests, fundamentally conceived of the nation as a conglomeration of equal citizens, one whose proper function depended most fundamentally on vigilance against the natural tendencies of power units (“special interests,” perhaps?) to upset the healthy balance of equals. National republicans/Whigs, on the contrary, conceived of the nation as an organism, a body politic in the most literal sense, whose proper operation depended not on equality but rather on a diversity of roles served by inequality, insofar as nature doled out different capacities for different roles. The function of government was to harmonize the body, to, ideally, perfectly match one’s role to one’s capacity. Ashworth’s book makes a convincing case, for he is quite
studio framework. This software package allows for code to be developed in a simulation environment before being applied directly to the hardware. Once the binary file has been compiled from C code, the targeted cores from the DSP system are then connected and the binary file loaded. For any memory needs, such as loading the index data and short reads into memory, a memory browser is used to load directly to the memory architectures available. The selected cores may then be executed to run the loaded binary instructions. In a production environment, the short reads would be able to be transferred through one of the DSP’s many high throughput communication modules available. This system of streaming short reads from the NGS frees up additional memory from the DSP. Unlike alternate coprocessors, the design of the DSP allows for an implementation to entirely run on a self-contained board. The Advantech board used in this thesis requires that power be supplied over a PCI Express connection provided by a computer, but no other functionality is used from that connection. Ideally, testing would be completed with an alternate power source and the board would operate outside of a computer environment, but precise power measurements are still able to be obtained for testing purposes of this thesis.