Evaluating the Distribution of Terrestrial Dissolved Organic Matter in a Complex Coastal Ecosystem Using Fluorescence Spectroscopy

The coastal zone of the Florida Keys features the only living coral reef in the continental United States and as such represents a unique regional environmental resource. Anthropogenic pressures combined with climate disturbances such as hurricanes can affect the biogeochemistry of the region and threaten the health of this unique ecosystem. As such, water quality monitoring has historically been implemented in the Florida Keys, and six spatially distinct zones have been identified. In these studies however, dissolved organic matter (DOM) has only been studied as a quantitative parameter, and DOM composition can be a valuable biogeochemical parameter in assessing environmental change in coastal regions. Here we report the first data of its kind on the application of optical properties of DOM, in particular excitation emission matrix fluorescence with parallel factor analysis (EEM-PARAFAC), throughout these six Florida Keys regions in an attempt to assess spatial differences in DOM sources. Our data suggests that while DOM in the Florida Keys can be influenced by distant terrestrial environments such as the Everglades, spatial differences in DOM distribution were also controlled in part by local surface runoff/fringe mangroves, contributions from seasgrass communities, as well as the reefs and waters from the Florida Current. Application of principal component analysis (PCA) of the relative abundance of EEM-PARAFAC components allowed for a clear distinction between the sources of DOM (allochthonous vs. autochthonous), between different autochthonous sources and/or the diagenetic status of DOM, and further clarified contribution of terrestrial DOM in zones where levels of DOM were low in abundance. The combination between EEM-PARAFAC and PCA proved to be ideally suited to discern DOM composition and source differences in coastal zones with complex hydrology and multiple DOM sources.

Hybrid Power System Intelligent Operation and Protection Involving Plug-in Electric Vehicles

Two key solutions to reduce the greenhouse gas emissions and increase the overall energy efficiency are to maximize the utilization of renewable energy resources (RERs) to generate energy for load consumption and to shift to low or zero emission plug-in electric vehicles (PEVs) for transportation. The present U.S. aging and overburdened power grid infrastructure is under a tremendous pressure to handle the issues involved in penetration of RERS and PEVs. The future power grid should be designed with for the effective utilization of distributed RERs and distributed generations to intelligently respond to varying customer demand including PEVs with high level of security, stability and reliability. This dissertation develops and verifies such a hybrid AC-DC power system. The system will operate in a distributed manner incorporating multiple components in both AC and DC styles and work in both grid-connected and islanding modes. The verification was performed on a laboratory-based hybrid AC-DC power system testbed as hardware/software platform. In this system, RERs emulators together with their maximum power point tracking technology and power electronics converters were designed to test different energy harvesting algorithms. The Energy storage devices including lithium-ion batteries and ultra-capacitors were used to optimize the performance of the hybrid power system. A lithium-ion battery smart energy management system with thermal and state of charge self-balancing was proposed to protect the energy storage system. A grid connected DC PEVs parking garage emulator, with five lithium-ion batteries was also designed with the smart charging functions that can emulate the future vehicle-to-grid (V2G), vehicle-to-vehicle (V2V) and vehicle-to-house (V2H) services. This includes grid voltage and frequency regulations, spinning reserves, micro grid islanding detection and energy resource support. The results show successful integration of the developed techniques for control and energy management of future hybrid AC-DC power systems with high penetration of RERs and PEVs.

Examining the needs for student services of adult learners in continuing higher education

The primary purpose of this study was to examine the availability and quality of student services offered to adult learners in selected continuing education programs in Dade County, Florida. The two basic research questions addressed in this study were: 1) What are the student services being provided to adult learners by the selected colleges and universities? 2) What is the quality of these services being provided as perceived by administrators and adult learners at their institutions? Two groups comprised the population for this study. One group sample of adult learners enrolled in credit courses being offered by the continuing education unit. The second group sample was comprised of administrators in the areas of Admissions, Financial Aid, Registration, Student Services and Continuing Education at each of the five colleges and universities in Dade County, Florida. Data were collected from 107 students and 25 administrators using the Continuing Education Student Services Questionnaire (CESSQ) developed by the researcher in a pilot study. The questionnaire, one for administrators and a similar one for adult learners, consisted of two parts. One consisted of eight demographic items and the second one of twenty items describing student services. An overview of responses by institutions showed that only the following services received a 100% response as available at one or more institutions: 1) Admissions Information, 2) Convenient Hours for Registration, 3) Assistance in Class Registration, 4) Assistance in Planning a Class Schedule, 5) Access to the Library in Evening and Weekends, 6) Parking and Security, 7) Food Services, 8) Bookstore and 9) Access to Computers.

At surface behaviour of juvenile and female southern elephant seals from King George Island from expeditions JUB1996 and JUB1997

Between December 1996 and February 1997, weaned pups and postmoult female southern elephant seals (Mirounga leonina) were fitted with satellite transmitters at King George Island (South Shetlands). Of the nine adult females tracked for more than two months, three stayed in a localized area between the South Shetlands and the South Orkneys. The other six females travelled southwest along the coast of the Antarctic Peninsula up to the Bellingshausen Sea. Two of them then moved far northeast and hauled out on South Georgia in October. One female was last located north of the South Shetlands in March 1998. In total, eight females were again sighted on King George Island and six of the transmitters removed. The tracks of the weaners contrasted with those of the adults. In January, five juveniles left King George Island for the Pacific sector ranging about four weeks in the open sea west of the De Gerlache Seamounts. Three of them returned to the tip of the Antarctic Peninsula in June, of which one was last located on the Patagonian Shelf in November 1997. A computer animation was developed to visualize the animal movements in relation to the extent and concentration of sea ice. The juveniles avoided sea ice while the adults did not. The latter displayed behavioural differences in using the pack ice habitat during winter. Some females adjusted their movement patterns to the pulsating sea ice fringe in far-distant foraging areas while others ranged in closed pack ice of up to 100 %. The feeding grounds of adult female elephant seals are more closely associated with the pack ice zone than previously assumed.

Multimode microfiber interferometer for dual-parameters sensing assisted by Fresnel reflection

A compact and low cost fiber sensor based on single multimode microfiber with Fresnel reflection is proposed and demonstrated for simultaneous measurement of refractive index and temperature. The sensor is fabricated with two simple steps including fiber tapering and then fiber endface cleaving. The reflection spectrum is an intensity modulated interference spectrum, as the tapered fiber generates interference pattern and the cleaved endface provides intensity modulation. By demodulating the fringe power and free spectrum range (FSR) of the spectrum, RI sensitivities of -72.247dB/RIU and 68.122nm/RIU, as well as temperature sensitivities of 0.0283dB/degrees C and -17pm/degrees C are obtained. Further, the sensing scheme could also provide the feasibility to construct a more compact sensing probe for dual-paramters measurement, which has great potential in bio/chemical detection.

Verification of the indoor gps system by comparison with points calibrated using a network of laser tracker measurements

This paper details a method of determining the uncertainty of dimensional measurement for a three dimensional coordinate measurement machine. An experimental procedure was developed to compare three dimensional coordinate measurements with calibrated reference points. The reference standard used to calibrate these reference points was a fringe counting interferometer with the multilateration technique employed to establish three dimensional coordinates. This is an extension of the established technique of comparing measured lengths with calibrated lengths. Specifically a distributed coordinate measurement device was tested which consisted of a network of Rotary-Laser Automatic Theodolites (R-LATs), this system is known commercially as indoor GPS (iGPS). The method was found to be practical and able to establish that the expanded uncertainty of the basic iGPS system was approximately 1 mm at a 95% confidence level. © Springer-Verlag Berlin Heidelberg 2010.

Surface quality and surface waves on subwavelength-structured silver films

We analyze the physical-chemical surface properties of single-slit, single-groove subwavelength-structured silver films with high-resolution transmission electron microscopy and calculate exact solutions to Maxwell’s equations corresponding to recent far-field interferometry experiments using these structures. Contrary to a recent suggestion the surface analysis shows that the silver films are free of detectable contaminants. The finite-difference time-domain calculations, in excellent agreement with experiment, show a rapid fringe amplitude decrease in the near zone (slit-groove distance out to 3–4 wavelengths). Extrapolation to slit-groove distances beyond the near zone shows that the surface wave evolves to the expected bound surface plasmon polariton (SPP). Fourier analysis of these results indicates the presence of a distribution of transient, evanescent modes around the SPP that dephase and dissipate as the surface wave evolves from the near to the far zone.

The Resurgence of Gaelic power in Ireland and Scotland and its wider impact, c.1350-1513

Over the course of the later Middle Ages nearly half the landmass of the British Isles fell under the control of a handful of Gaelic dynasties in Ireland and Scotland. The impact of this profound geopolitical recasting of much of the Atlantic Archipelago has however, received very little scholarly attention. Instead, historians have tended to view events within this expanding Gaelic world, or Gàidhealtachd, as peripheral to the political development of the British Isles and the course of Anglo-Scottish relations during the later Medieval period. Drawing upon a comprehensive range of sources from Ireland, Scotland, and England, as well as significant archival research, this thesis challenges the concept of the so-called 'Celtic fringe' and illustrates how developments within the Gàidhealtachd impacted upon the course of 'British' politics during the period c.1350-1513. The thesis centres on an examination of how two competing Gaelic alliance systems came to dominate much of the Gàidhealtachd from the late fourteenth century through to the early 1500s. The first of these alliance blocs was controlled chiefly by the O'Neills of Tyrone, the O'Briens of Thomond, and MacDonalds of the Hebrides; in the other network the O'Donnells of Tyrconnell, the Burkes of Mayo and the Campbells of Argyll held sway. By tracing the interconnectivity of the lordships in each respective network, the thesis investigates how these alliance systems became a durable force not only within the Gàidhealtachd but also on the broader 'British' stage. The thesis is structured in a manner that makes the intricate, lineage-based world of the Gàidhealtachd more accessible. Each chapter shifts between the various regions of the Gaelic world and examines how developments in one region impacted upon corresponding territory. Ultimately, this provides historians with a new model for exploring what has previously been a majorly neglected area of Irish and British history.

Sources, Fate and Transformation of Organic Matter in Wetlands and Estuaries

Dissolved organic matter (DOM) is a complex mixture of organic compounds and represents the largest reservoirs of carbon (C) on earth. Particulate organic matter (POM) is another important carbon component in C cycling and controls a variety of biogeochemical processes. Estuaries, as important interfaces between land and ocean, play important roles in retaining and transforming such organic matter (OM) and serve as both sources and sinks of DOM and POM. There is a diverse array of both autochthonous and allochthonous OM sources in wetland/estuarine ecosystems. A comprehensive study on the sources, transformation and fate of OM in such ecosystems is essential in advancing our understanding of C cycling and better constraining the global C budget. In this work, DOM characteristics were investigated in different estuaries. Dissolved organic matter source strengths and dynamics were assessed in a seagrass-dominated subtropical estuarine lagoon. DOM dynamics controlled by hydrology and seagrass primary productivity were confirmed, and the primary source of DOM was quantified using the combination of excitation emission matrix fluorescence with parallel factor analysis (EEM-PARAFAC) and stable C isotope analysis. Seagrass can contribute up to 72% of the DOM in the study area. The spatial and temporal variation of DOM dynamics was also studied in a freshwated dominated estuary fringed with extensive salt marshes. The data showed that DOM was primarily derived from freshwater marshes and controlled by hydrology while salt marsh plants play a significant role in structuring the distribution patterns of DOM quality and quantity. The OM dynamics was also investigated in a mangrove-dominate estuary and a comparative study was conducted between the DOM and POM pools. The results revealed both similarity and dissimilarity in DOM and POM composition. The dynamics of both OM pools are largely uncoupled as a result of source differences. Fringe mangrove swamps are suggested to export similar amounts of DOM and POM and should be considered as an important source in coastal C budgets. Lastly, chemical characterizations were conducted on the featured fluorescence component in OM in an attempt to better understand the composition and origins of the specific PARAFAC component. The traditionally defined ‘protein-like’ fluorescence was found to contain both proteinaceous and phenolic compounds, suggesting that the application of this parameter as a proxy for amino acid content and bioavailability may be limited.

Pollen analysis of sediment core GIK16415-2 in the eastern tropical Atlantic

Palynological data of the marine core M 16415-2 show latitudinal shifts of the northern fringe of the tropical rain forest in north-west Africa during the last 700 ka. Savanna and dry open forest expanded southwards and tropical rain forest expanded northwards during dry and humid periods, respectively. Until 220 ka B.P., the tropical rain forest probably kept its zonal character in West Africa during glacials and interglacials. It is only during the last two glacial periods that the rain forest possibly fragmented into refugia. Throughout the Brunhes chron, pollen and spore transport was mainly by trade winds.

The magical transformation contest in the ancient storytelling tradition

El concurso de transformación mágica, esquema narrativo difundido en la tradición popular, se presenta en dos variantes principales: los hechiceros que compiten pueden metamorfosearse en varios seres o crear esos seres por medios mágicos. En cualquier caso el concursante ganador da a luz criaturas más fuertes que superan las de su oponente. La segunda variante fue preferida en el antiguo Cercano Oriente (Sumeria, Egipto, Israel). La primera se puede encontrar en algunos mitos griegos sobre cambiadores de forma (por ejemplo, Zeus y Némesis). El mismo esquema narrativo puede haber influido en un episodio de la Novela de Alejandro (1.36-38), en el que Darío envía regalos simbólicos a Alejandro y los dos monarcas enemigos ofrecen contrastantes explicaciones de ellos. Esta historia griega racionaliza el concurso de cuento de hadas, transfiriendo las fantásticas hazañas de creaciones milagrosas a un plano secundario pero realista de metáfora lingüística.

Het effect van formele en informele feedback op het innovatievermogen van organisaties

Little attention in literature so far has been given to the impact of feedback on organizational development and change. As well as the impact of feedback on the innovation power of organizations. The capacity of innovation of organizations however may be seen as a crucial capacity of organizations to survive in competitive markets. Prior studies towards the impacts of feedback have more often analyzed formal and informal feedback separately, other than analyzing them together in one study. This master thesis develops and explores a model to assess the possible impact of both formal and informal feedback on the capacity of innovation within organizations. The master thesis is the closing assignment of a Master Study Management at the Open Universiteit Nederland. The general question of the single-case study is: What is the impact of formal and informal feedback on the capacity of innovation of companies? The explored model in the study is a combination of the model of Lawson and Samson (2001) about the capacity of innovation and the framework model of Pitkänen and Lukka (2011) about formal and informal feedback. The single-case study is performed at Yellowbrick, a Dutch company which offers consumers an online parking service, suitable for the use on smartphones. The single-case study is performed twofold by semi-structured interviews and a survey. Although conclusions may not be generalized, because of the limitations of the study and the particularly small investigated group, some findings may be suitable for further investigation. In the study was found that feedback has an impact on the capacity of innovation. Formal feedback scored higher than informal feedback when asked about the impact on the capacity of innovation. The study also found multiple ‘new’ kinds of feedback used by organizations, other than the more ‘traditional’ forms of feedback, such as team meetings and bilateral meetings. Further on was analyzed that when employees find themselves more involved in the process of an innovation, they also seem to score the organization higher on the capacity of this innovation.