The role of supraglacial snowpack hydrology in mediating meltwater delivery to glacier systems

This thesis investigates the role that superglacial snowpack hydrology plays in mediating meltwater delivery to glacier systems. The movement of water through glaciers is of fundamental importance as a control on proglacial hydrograph amplitude and timing, subglacial and proglacial geomorphic processes, the hydrochemistry of glacial runoff, and glacier dynamics, and as such has been the subject of considerable research effort. Although studies in non-glacial environments have shown that meltwater waves are both dampened and delayed by passage through snow, the role of supraglacial snowcover in mediating water inputs to the rest of the glacier system ahs received limited attention in studies of glacier hydrology to date. It has been suggested, however, that the varying thickness, and ultimately removal, of the superglacial snowpack may play a role in controlling the timing and magnitude of ice velocity events. Despite this suggested importance there have been few field observations of the hydrological behaviour of supraglacial snowpacks or of the way in which this behaviour evolves during the melt season. A thorough assessment of the linkages between supraglacial snowpack conditions and glacier dynamic events has therefore not been possible. This study helps fill this gap in our knowledge by explicitly investigating the hydrological behaviour of the supraglacial snowpack at an alpine glacier and its evolution during the summer melt season. Field data was collected during two summer field seasons (2003 and 2004) at Haut Glacier d’Arolla, Valais, Switzerland. Dye tracing experiments were used as the primary method of obtaining information about water flow through the snowpack. Dye was used both qualitatively, to give a visual impression of flow patterns through the snowpack, and quantitatively, with return curves detected by fluorometer providing detailed information about rates of dye movement and dispersion through the snowpack. Physically-based modelling representations of water flow through snow also informed consideration of the characteristics of snowpack runoff. Experiments were designed to determine: i) the nature of water flow through the supraglacial snowpack; ii) if, and in what way, this evolves over the course of the melt season; and iii) what factors control water movement, and the importance of their roles. In order that links between supraglacial snowpack hydrology and other parts of the glacier system could be considered, season-long records of glacier dynamics, proglacial meltwater discharge, and water quality parameters indicating subglacial conditions were also collected

Interactions Between the Feed and Feeding Environment

This information was presented at the 2016 Cornell Nutrition Conference for Feed Manufacturers, organized by the Department of Animal Science In the College of Agriculture and Life Sciences at Cornell University. Softcover copies of the entire conference proceedings may be purchased at http://ansci.cals.cornell.edu/extension-outreach/adult-extension/dairy-management/order-proceedings-resources

Helicity, linking, and writhe in a spherical geometry

Open Access journalLinking numbers, helicity integrals, twist, and writhe all describe the topology and geometry of curves and vector fields. The topology of the space the curves and fields live in, however, can affect the behaviour of these quantities. Here we examine curves and fields living in regions exterior to a sphere or in spherical shells. The winding of two curves need not be conserved because of the topology of a spherical shell. Avoiding the presence of magnetic monopoles inside the sphere is very important if magnetic helicity is to be a conserved quantity. Considerations of parallel transport are important in determining the transfer of helicity through the foot of a magnetic flux tube when it is in motion

Beneath the Cross: A Historical Tour of the Holy Cross Jesuit Cemetery

What began as a guide for the Jesuit cemetery at the College of the Holy Cross in Worcester, Massachusetts has become a collection of biographical profiles and an historical timeline written as the College celebrates its dodranbicentennial. The book consists of seven chapters, each dealing with one of the seven 25-year periods that make up the College’s 175 years. Each chapter includes, for its time period, a view of how the College looked, a timeline outlining the important events that occurred and a short biography of the men who died and were buried in the cemetery.https://crossworks.holycross.edu/hc_books/1060/thumbnail.jp

Narcissism in the eating disorders: Impact on treatment engagement and drop-out.

This paper reviews research examining the psychosocial factors that influence adherence to the psychological treatment of the eating disorders. Drop-out in the eating disorders was found to range between 15 and 73 percent, with an average drop-out of 37 percent Specific factors (relating to the patient, therapy, therapist. patient-therapist relationship, social, geographical and physical features) are examined and discussed in turn. Little consistency was found with regards to the definition of drop-out employed by researchers or the factors found to have an impact of drop-out The potential clinical implications of the findings are discussed. and suggestions are made for future directions in research

Study of pollution in the El Jadida-Safi Atlantic coastal zone (Morocco) by using PIXE and SSNTD methods

In this work PIXE experiments were performed for measuring heavy and light elements (ranging from aluminium to lead) concentrations inside various polluted and unpolluted soils as well as liquid samples collected from different phosphate factory sewers in the El Jadida-Safi Atlantic coastal region (Morocco). In addition, uranium (238U) and thorium (232Th) contents were evaluated in the same samples studied by using CR-39 and LR-115 type II solid state nuclear track detectors (SSNTDs). The influence of the phosphate industry wastes on the concentrations of both radioactive and non-radioactive elements of the samples studied was investigated

Modeling and Characterization of a Novel, Low-Cost, Direct-Write Waveguide

Both the current long-term telecommunication trends toward optical networking and the recent growth in information bandwidth have pushed the necessity for improved optical communications. Our fabrication approach, which leverages our expertise in solid freeform fabrication in conjunction with sol-gel technology, has advantages over these other methods because of the inherent benefits of using a direct-write philosophy, such as design flexibility and minimal post-processing. However, fabrication of such novel optical components requires extensive knowledge of their light guidance capabilities. This paper will show the technical issues involved in both modeling and characterizing small optical components fabricated by locally densifying sol-gels in a modified directwrite process.Mechanical Engineerin

Directions of ICF research in the United States

Inertial Confinement Fusion (ICF) research in the United States is in a dramatic upswing. Technical progress continues at a rapid pace and with the start of construction of the National Ignition Facility (NIF) this year the total U.S. budget for ICF for fiscal year 1997 stands at $380 million. The NIF is being built as an essential component of the U.S. Stockpile Stewardship and Management Program, which has been formulated to assure the continued safety, reliability and performance of the downsized nuclear weapons stockpile in the absence of nuclear tests. Thus the increase in funding originates in the Congressional armed services committees and is managed by Defense Programs of the Department of Energy. The NIF, however, is a fundamental research tool that will be of great benefit beyond its mission within the nuclear weapons program. Its experiments will promote fusion energy development and will open new areas of basic scientific research. This paper will discuss some of the directions that ICF research is now taking, the progress on the NIF Project, and the potential impact that these developments are likely to have on fusion energy development and on certain areas of the basic sciences