MS – 213: Papers of Edmund F. Churchill

This collection includes numerous letters, in a single box, in good condition written by Edmund Churchill to members of his family at home, chiefly his father and sister, Charlotte. There are fifty-two letters to Charlotte, twenty-one to his father, and four to his brother. There is one letter from Edmund’s father, as well as two letters from his brother Theodore to their father. Also included are several pages of Churchill’s “diary”, which he entitled Memoranda, which cover major events on a monthly basis. Several pages of background are included, provided by the previous owner. The location given for each letter was derived from information provided on the envelopes. Special Collections and College Archives Finding Aids are discovery tools used to describe and provide access to our holdings. Finding aids include historical and biographical information about each collection in addition to inventories of their content. More information about our collections can be found on our website https://www.gettysburg.edu/special-collections/collections/.https://cupola.gettysburg.edu/findingaidsall/1210/thumbnail.jp

Provocation through Accessibility at Special Collections at Musselman Library

Gettysburg College Special Collections is a place where the worlds of archiving, preservation, and interpretation intersect. In the climate-controlled stacks, shelves lined with volume after volume attest to the centuries of history that the college has witnessed. It is the role of the current staff and interns to disseminate the seemingly infinite artifacts, manuscripts, and other primary sources that come through the door to those who travel to Special Collections to learn, discover, and enrich themselves. As Freeman Tilden wrote, “Information, as such, is not interpretation. Interpretation is revelation based upon information”. However, interpretation is not something that should be rigidly defined and passed from person to person without question. In places such as Special Collections, we seek to provoke interactions between the sources and those using them; we hope to facilitate an environment where such interpretations can be made

Generalized Yule-Walker Estimation for Spatio-Temporal Models with Unknown Diagonal Coefficients

We consider a class of spatio-temporal models which extend popular econometric spatial autoregressive panel data models by allowing the scalar coefficients for each location (or panel) different from each other. To overcome the innate endogeneity, we propose a generalized Yule-Walker estimation method which applies the least squares estimation to a Yule-Walker equation. The asymptotic theory is developed under the setting that both the sample size and the number of locations (or panels) tend to infinity under a general setting for stationary and alpha-mixing processes, which includes spatial autoregressive panel data models driven by i.i.d. innovations as special cases. The proposed methods are illustrated using both simulated and real data

Alien Registration- Parrella, Assunta (Rumford, Oxford County)

https://digitalmaine.com/alien_docs/12193/thumbnail.jp

Magnetic material characterization and magnet axis displacement measurement for particle accelerators

Bending and focusing magnets, both normal- or super-conducting, are crucial elements for the performance of any particle accelerator. Their design requirements are always more tighten regarding components’ misalignment and magnetic properties. This dissertation proposes new solutions for characterizing magnetic materials and monitoring solenoids’ magnetic axis misalignments. A superconducting permeameter is designed to characterize the new-generation superconducting magnet yokes at their operational temperature and saturation level. As proof of principle, the magnetic characterization of ARMCO® Pure Iron was performed at the cryogenic temperature of 4.2 K and a saturation level of nearly 3 T. A case study based on the new HL-LHC superconducting magnets quantifies the impact of the magnetic properties of the yoke on the performances of the superconducting magnets. A flux-metric based method is proposed to identify the relative magnetic permeability of weakly magnetic materials. As proof of principle, the magnetic properties of the ITER TF coils quench detection stainless steel are analyzed. This method is not suitable to test materials with a relative permeability lower than 1.1. Hence, a measurement system based on a new magneto-metric method is conceived and validated employing a standard reference sample. The methods proposed in this thesis are currently employed at CERN’s magnetic laboratory to face an increasing number of requests concerning not only the magnetic characterization of materials for magnets but also for shielding systems and compatibility of various components with high magnetic fields. In this thesis, the results of the evaluation of ARMCO® Pure Iron as the yoke of the new LHC superconducting magnets and CRYOPHY as the magnetic shield for the cryomodule prototypes of HL-LHC Crab Cavities are reported. Finally, a new Hall-sensor method is conceived and implemented for monitoring the coils alignment in multi-coil magnets, directly during their operation in particle accelerators. The proposed method is suitable even for those cases when almost the whole magnet aperture is not accessible. Requiring only a few measurements of the magnetic field at fixed positions inside the magnet aperture, the method overcomes the main drawback of the other Hall sensor-based methods which is having to deal with sturdy mechanics of the moving stages. The method is validated numerically on a challenging case study related to the Solenoid B of the project ELI-NP

Produção de sementes de sorgo sacarino.

bitstream/item/47064/1/Producao-sementes.pd