MS-167: Hiram Parker Jr. Letters

There are 52 letters total in the collection spanning from 1862-1874. The bulk of the letters are written by Hiram most of which are to his father, mother Mary Sparks. However, there are a couple to another member of the Sparks family and a few other friends. Six are letters written to Hiram from his friends and the collection also includes 12 handwritten and printed reports on the construction of the gunboat Tacony. Hiram’s letters are very detailed (some of his letters are over a dozen pages), and he wrote to people very often even adding on to some letters after he originally finished writing them. Many of the letters still have their original envelopes with them. 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 http://www.gettysburg.edu/special_collections/collections/.https://cupola.gettysburg.edu/findingaidsall/1140/thumbnail.jp

MS-129: Burlew Letters

This collection consists of letter written between Aaron E. Burlew, John W. Burlew, and Carrie Burlew, all siblings from Atkinsons Mills, Pennsylvania, during the Civil War.https://cupola.gettysburg.edu/findingaidsall/1149/thumbnail.jp

Fermi level alignment in single molecule junctions and its dependence on interface structure

The alignment of the Fermi level of a metal electrode within the gap of the highest occupied and lowest unoccupied orbital of a molecule is a key quantity in molecular electronics. Depending on the type of molecule and the interface structure of the junction, it can vary the electron transparency of a gold/molecule/gold junction by at least one order of magnitude. In this article we will discuss how Fermi level alignment is related to surface structure and bonding configuration on the basis of density functional theory calculations for bipyridine and biphenyl dithiolate between gold leads. We will also relate our findings to quantum-chemical concepts such as electronegativity.Comment: 5 pages, 2 figures, presented at the ICN+T 2006 conferenc

Editorial

No aspect of the practice of pediatric anesthesia is more essential than airway management. Pediatric anesthesiologists are the ‘go to’ specialists when infants and children with difficult airways present anywhere in the hospital. To our advantage, rapid technical advances have taken place during the past decades and the number of tools available to assist us in providing and maintaining a secure and stable airway has increased significantly. Until the 1970s tracheal intubation with a conventional laryngoscope or blind nasal intubation were the mainstays of establishing an artificial airway. The choice of endotracheal tubes was limited. During the past 20 years a remarkable assortment of equipment and novel techniques to facilitate optimal airway management have been developed. These include supraglottic airways, direct and fiberoptic laryngoscopes and transtracheal devices. Improved imaging of the airway prior to initiation of airway management, with CT and MRI, for example, and during airway manipulation and instrumentation, using fiberoptic cameras and portable video displays, is now widely used. While new developments in airway management have helped us improve the quality of care of our patients, new challenges have also arisen. Which techniques should we learn, teach and employ? Which endotracheal tubes should be utilized – uncuffed or cuffed, old or new design? Which of our patients need preoperative imaging of the airway and/or sleep studies? What are the risks of newer interventions, including novel airway devices and laser instruments

Assessing the impact of modeling limits on intelligent systems

The knowledge bases underlying intelligent systems are validated. A general conceptual framework is provided for considering the roles in intelligent systems of models of physical, behavioral, and operational phenomena. A methodology is described for identifying limits in particular intelligent systems, and the use of the methodology is illustrated via an experimental evaluation of the pilot-vehicle interface within the Pilot's Associate. The requirements and functionality are outlined for a computer based knowledge engineering environment which would embody the approach advocated and illustrated in earlier discussions. Issues considered include the specific benefits of this functionality, the potential breadth of applicability, and technical feasibility

Universal few-body physics in a harmonic trap

Few-body systems with resonant short-range interactions display universal properties that do not depend on the details of their structure or their interactions at short distances. In the three-body system, these properties include the existence of a geometric spectrum of three-body Efimov states and a discrete scaling symmetry. Similar universal properties appear in 4-body and possibly higher-body systems as well. We set up an effective theory for few-body systems in a harmonic trap and study the modification of universal physics for 3- and 4-particle systems in external confinement. In particular, we focus on systems where the Efimov effect can occur and investigate the dependence of the 4-body spectrum on the experimental tuning parameters.Comment: 20 pages, 10 figures, final version, new references adde

Experimental studies of perceptual processes, section two Progress report, Jan. - Sep. 30, 1965

Complex discriminative behavior, fixed ratio reinforcement of large units of behavior and deferred reinforcement studied in chimpanzee