1,456 research outputs found
2012 Symposium: A Telecommunications Agenda for 2012 and Beyond â Keynote Address
Commissioner Mignon L. Clyburn, Federal Communications Commission. This Address was transcribed from the introductory keynote delivered at the 2012 Symposium hosted by CommLaw Conspectus: Journal of Communications Law and Policy and the Institute for Communications Law Studies on April 11, 2012, titled A Telecommunications Agenda for 2012 and Beyond
Displays of Medici Wealth and Authority: The Acts of the Apostles and Valois FĂȘtes Tapestry Cycles
The objective of my research is to explore Medici extravagance, power, and wealth through the multifaceted artistic form of tapestries vis-Ă -vis two particular tapestry cycles; the Acts of the Apostles and the Valois FĂȘtes. The cycles were commissioned by Pope Leo X (1475-1521), the first Medici pope, and Catherine de\u27 Medici (1519-1589), queen, queen regent, and queen mother of France. The motivation for such a project lies in analyzing what is traditionally considered as two independent tapestry cycles by revealing their social, religious, political, and artistic significance through the powerful dynastic influence of the Medici. As Leo and Catherine were both aware of the contemporary social environment, their commission of the Acts of the Apostles and the Valois FĂȘtes exemplify the Medici streak for ambition, familial dependence, and triumphalism. As Leo X (r. 1513-1521) governed from Rome, Catherine de\u27 Medici (r. 1547-1559) presided over the French throne for nearly fifty years in some capacity. Both Medici enjoyed access to the wealth associated with the Papal Curia and Valois royal household accounts, respectively, investing an enormous sum on the tapestry cycles, only one of the numerous artistic commissions procured during the sixteenth century. Heedless of their iconography and embellishment, the Acts of the Apostles and Valois FĂȘtestestify to the wealth and power wielded through their patron\u27s accessibility and resourcefulness to procure an estimable and luxurious commission
Nutrient Limitation of Phytoplankton in Lake Wateree, South Carolina: Implications for Future Water Quality Management
Cultural eutrophication is a primary contributor to phytoplankton production in freshwater lakes from excess anthropogenic nutrient inputs, and resulting impacts on water quality, aquatic ecosystems, human and animal health are increasing worldwide. Understanding the factors that limit phytoplankton growth is an important strategy for identifying and managing nutrient sources and successfully controlling the over- enrichment of nitrogen (N) and/or phosphorus (P) in freshwater lakes. The Redfield molecular ratio of carbon (C), N and P maintains that the C:N:P molar ratio is 106:16:1 when nutrients are not limiting, and the ecosystem is balanced. A N:P molar ratio \u3e 20:1 tends to be indicative of P limitation in freshwaters, while a N:P molar ratio \u3c 10:1 usually indicates N limitation, regardless of freshwater or seawater. Historically, studies on freshwater lakes have emphasized control of P, but more recent studies have challenged the P limitation paradigm and emphasized control of N or duel control of N and P.
Surveillance monitoring and ambient water quality and nutrient data in Lake Wateree, South Carolina indicate elevated symptoms of excess nutrients including decreased dissolved oxygen and water clarity, elevated pH and increasing phytoplankton blooms, both spatially and temporally. This study aimed to define the nutrient limitation indicator(s) to predict phytoplankton growth in Lake Wateree using nutrient enrichment bioassays. A series of four factorial design experiments were conducted during the summer and fall (August through October 2017) for the evaluation of both separate and interactive roles of N and P during in situ incubation periods of 48 hours within the lake environment at ambient conditions. The four treatments included a control (deionized water), + N (NH4+), + P (PO43-) and + NP (NH4++ PO43-) additions and their effects on phytoplankton growth using chlorophyll-a fluorescence as the response variable.
Nutrient relationships were determined from the twenty categorical responses, and despite exceedances in P water quality criteria, the bioassays produced no P limitation or serial P limitation responses. Instead, twelve of the experimental responses (60%) were co-limitation, four responses (20%) were serial N limitation, three responses (15%) were N limitation, and one response (5%) was not significant. The results of this study are valuable in identifying the importance of each nutrient factor (N and P) and achieving successful lake management goals by reducing excess nutrients and improving water quality in Lake Wateree
KHATRI-RAO PRODUCTS AND CONDITIONS FOR THE UNIQUENESS OF PARAFAC SOLUTIONS FOR IxJxK ARRAYS
One of the differentiating features of PARAFAC decompositions is that, under certain conditions, unique solutions are possible. The search for uniqueness conditions for the PARAFAC Decomposition has a limited past, spanning only three decades. The complex structure of the problem and the need for tensor algebras or other similarly abstract characterizations provided a roadblock to the development of uniqueness conditions. Theoretically, the PARAFAC decomposition surpasses its bilinear counterparts in that it is possible to obtain solutions that do not suffer from the rotational problem. However, not all PARAFAC solutions will be constrained sufficiently so that the resulting decomposition is unique. The work of Kruskal, 1977, provides the most in depth investigation into the conditions for uniqueness, so much so that many have assumed, without formal proof, that his sufficient conditions were also necessary. Aided by the introduction of Khatri-Rao products to represent the PARAFAC decomposition, ten Berge and Sidiropoulos (2002) used the column spaces of Khatri-Rao products to provide the first evidence for countering the claim of necessity, identifying PARAFAC decompositions that were unique when Kruskals condition was not met. Moreover, ten Berge and Sidiropoulos conjectured that, with additional k-rank restrictions, a class of decompositions could be formed where Kruskals condition would be necessary and sufficient. Unfortunately, the column space argument of ten Berge and Sidiropoulos was limited in its application and failed to provide an explanation of why uniqueness occurred. On the other hand, the use of orthogonal complement spaces provided an alternative approach to evaluate uniqueness that would provide a much richer return than the use of column spaces for the investigation of uniqueness. The Orthogonal Complement Space Approach (OCSA), adopted here, would provide: (1) the answers to lingering questions about the occurrence of uniqueness, (2) evidence that necessity would require more than a restriction on k-rank, and (3) an approach that could be extended to cases beyond those investigated by ten Berge and Sidiropoulos
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