A New Method of Current Switching for Linear Wide-Range Measurement Systems

This new and general method here called overflow current switching allows a fast, continuous, and smooth transition between scales in wide-range current measurement systems, like electrometers. This is achieved, using a hydraulic analogy, by diverting only the overflow current, such that no slow element is forced to change its state during the switching. As a result, this approach practically eliminates the long dead time in low-current (picoamperes) switching. Similar to a logarithmic scale, a composition of n adjacent linear scales, like a segmented ruler, measures the current. The use of a linear wide-range system based on this technique assures fast and continuous measurement in the entire range, without blind regions during transitions and still holding suitable accuracy for many applications. A full mathematical development of the method is given. Several computer realistic simulations demonstrated the viability of the technique.

New constraints on H-0 and Omega(m) from SZE/X-ray data and baryon acoustic oscillations

The Hubble constant, H-0, sets the scale of the size and age of the Universe and its determination from independent methods is still worthwhile to be investigated. In this article, by using the Sunyaev-Zeldovich effect and X-ray surface brightness data from 38 galaxy clusters observed by Bonamente et al. (Astrophys J 647:25, 2006), we obtain a new estimate of H-0 in the context of a flat Lambda CDM model. There is a degeneracy on the mass density parameter (Omega(m)) which is broken by applying a joint analysis involving the baryon acoustic oscillations (BAO) as given by Sloan Digital Sky Survey. This happens because the BAO signature does not depend on H-0. Our basic finding is that a joint analysis involving these tests yield H-0 = 76.5(-3.33)(+3.35) km/s/mpc and Omega(m) = 0.27(-0.02)(+0.03). Since the hypothesis of spherical geometry assumed by Bonamente et al. is questionable, we have also compared the above results to a recent work where a sample of galaxy clusters described by an elliptical profile was used in analysis.

Evaluación de la escorrentía media anual obtenida por fórmulas climáticas y modelos regionales de clima

En regiones en las que no se dispone de un modelo hidrológico correctamente calibrado para estimar la escorrentía, se puede recurrir a la utilización de la escorrentía directa simulada por los modelos climáticos o a la escorrentía calculada a partir de fórmulas climatológicas que emplean variables climáticas básicas como la precipitación, temperatura y radiación solar, simuladas por los modelos regionales de clima (MRC). El presente trabajo compara el comportamiento de la escorrentía directa obtenida por 10 simulaciones de los MRC del proyecto europeo PRUDENCE y la escorrentía media anual calculada a partir de la aplicación de cinco fórmulas climatológicas (Schreiber, Ol’dekop, Budyko, Turc-Pike, Zhang et al.) basadas en el índice de aridez, definido por la relación entre la evapotranspiración potencial y la precipitación. Series temporales mensuales de escorrentía, precipitación, temperatura y radiación solar son generadas a partir de las simulaciones de los MRC en 338 cuencas de España que cubren la totalidad del territorio peninsular, bajo condiciones de clima actual (periodo 1961-1990). La evapotranspiración potencial se obtiene usando el método presentado por Hargreaves. Estas formas funcionales estiman la relación entre la evapotranspiración actual y la precipitación y a través de un balance hídrico se calculan los valores de escorrentía anual. El comportamiento general de las variables climáticas simuladas por los MRC se caracteriza por presentar menor sesgo para precipitación y temperatura que para escorrentía. Empleando estadísticos de comparación se analiza la capacidad que tiene la escorrentía directa y la escorrentía anual calculada a partir de las fórmulas climáticas para reproducir los valores observados de escorrentía natural estimada por el modelo hidrológico distribuido SIMPA en las cuencas españolas. En total se generaron 10 series mensuales de escorrentía directa y 50 series de escorrentía anual basadas en el índice de aridez (cada fórmula climática aplicada a las 10 simulaciones de los MRC). Los resultados muestran que la fórmula de Schreiber produce la mejor aproximación a los valores observados y por tanto minimiza el sesgo predominante en la variable escorrentía. Adicionalmente, estos resultados se validan con las capas de escorrentía media anual de alta resolución proporcionada por la UNH/GRDC (University of New Hampshire/Global Runoff Data Centre) que preservan la exactitud de las medidas de las aportaciones observadas en las principales estaciones hidrológicas de todo el mundo, y que en la actualidad es el “mejor estimador” de la escorrentía terrestre sobre grandes extensiones. En este caso, los resultados muestran también que la fórmula de Schreiber estima mejor los valores de escorrentía anual que la escorrentía directa simulada por MRC.

Letter from George Gardner Lee to Loammi Baldwin, 10 January 1814

Lee, a Boston merchant who often represented the city as deputy in the Massachusetts General Court, asks Baldwin if the laborers laying the bricks and stone for University Hall could be loaned for a few days to work on the construction of the South meeting house [New South Church].

College Book 4, 1686-1750

Regular recording of Corporation meetings began in College Book 4, which includes minutes from July 23, 1686 through September 5, 1750. Its spine title reads "College Book 4 & 5" due to a nineteenth century labeling error. The creation of College Book 4 was precipitated by the English Court of Chancery's October 1684 judgment, which annulled the Royal Charter of the Massachusetts Colony and seemed to render the College Charter of 1650 – and with it the Corporation and Board of Overseers – defunct. In May 1686, Joseph Dudley (Harvard AB 1665) received a commission as the President of the Council of New England, and on July 23, 1686, Dudley and the Council met in Boston to create a provisional College governing board led by Increase Mather as Rector of the College and John Leverett and William Brattle as Tutors. The "Rector and Tutors" mirrored in purpose if not in name the Corporation's "President and Fellows," and the agreements of President Dudley and the Council creating the new governing board comprise the first entry in College Book 4. In June 1692, a new act of incorporation for Harvard College was passed in the Massachusetts Legislature and signed by the Governor. The Charter of 1692 merged the functions of the Board of Overseers and the Corporation into one Corporation consisting of the President, Treasurer, and eight Fellows. As the Corporation created by this 1692 act (and modified in later versions of the Charter) grew unwieldy, its members met less frequently. As a result, the Faculty (known until 1825 as the "Immediate Government") assumed more responsibility in managing the College's daily operations and addressing student discipline. On December 6, 1707 the Massachusetts General Court restored the Charter of 1650, thus reestablishing the Board of Overseers and the Corporation as the governing bodies of Harvard College. The changes in name and composition of the Harvard Corporation between 1686 and 1707 are documented in the proceedings recorded in College Book 4.

Docket books and fee book, 1791-1806

Consists of 7 notebooks and 1 account book. Notebooks list cases heard before the Massachusetts Court of Common Pleas for Middlesex and Worcester counties and the Massachusetts Supreme Judicial Court (March 1794-Sept. 1797; Sept. 1800-March 1802; June 1805-September 1806) and before the New Hampshire Court of Common Pleas for Hillsborough and Merrimack counties (March 1798-March 1805). The account book includes cases from Sept. 1791-July 1797.

Manuscript copy of the book of Harvard, 1767

The pamphlet-sized manuscript includes "The Book of Harvard" signed "Joseph Cummings, scriptis, Janr 7th 1767," an untitled two-page essay beginning, "Wisdom is ye Crown of life" and ending "Draught of Knowledge, let us with a laudable ambition, strive to excel each other in an ardent pursuit of Learning, then shall we raise to ourselves a monument of honest fame, which shall perish only in ye general wreak of nature," and on the last page, "An Accrostick" beginning "Jangling & Discord are thy Souls delight" and spelling out JAMES MITCHEL VARNUM dated July 3, 1767 and signed "The 3d edition revised & improved by Gove & Fogg."

Harvard College Lottery Book, 1794-1797

The long hardcover account book contains handwritten records of the Harvard College Lottery in the hand of College Treasurer Ebenezer Storer. The volume begins with a transcription of the Massachusetts General Court June 13, 1794 legislation sanctioning the lottery, and a note that the managers of the lottery gave security bonds to the Corporation. The bulk of the volume records the activities of the four classes of the lottery including lists of the individual tickets returned by the managers Benjamin Austin Jr., George R. Minot, Henry Warren, and John Kneeland, and the accounts of prizes drawn and tickets returned. The volume has a table of contents and there is a note pasted onto the third page calculating the sum raised if all tickets had been sold.

The report of the committee about Harvard Coledge: presented to the Generall Court held the 3 of (3) month, 1654

Two folio-sized leaves with a handwritten draft of the May 3, 1654 report of a General Court Committee authorized to investigate the financial state of Harvard College. The report responds directly to eight questions raised in the September 10, 1653 Order of the General Court that established the Committee. The report provides summaries of Harvard's income sources and disbursements, offers recommendations regarding the President's salary and the allowances for the academic Fellows, steward, butler, and cook, and indicates specific contributions from local towns.

Abstracts of legislation relating to Harvard College governance (manuscript notebook), ca. 1723

Octavo-sized notebook containing handwritten abstracts of Massachusetts General Court legislation between 1650 and August 24, 1723 related to Harvard governance. The volume contains informal notes with extracts and summaries of legislation that established or amended the makeup and power of the Harvard Corporation. The authors of the volume are unidentified, but the notes appear to be in two different hands. The volume was presumably created during the fellowship controversy that erupted in the early 1720s after tutors Henry Flynt, Nicholas Sever, and Thomas Robie presented a memorial to the Board of Overseers calling for the tutors' right of fellowship in the Corporation.

Receipts, 1798, 1799, 1809

Handwritten receipts for fees and debts collected.

Notes of cases before colonial New Jersey courts, 1735-1755

Contains notes of cases before several New Jersey courts especially the New Jersey Supreme Court. Possibly compiled by Coxe.

Compendium logicæ secundum principia D. Renati Descarte catechisticè propositum : [1693]

Small leather hardcover volume containing a manuscript copy of William Brattle’s abstract of René Descartes’ "Compendium Logicae" copied in Latin, likely by Thomas Phipps in 1693. A crossed out inscription on the inside back cover appears to read “Thomas Phips 1693” likely referring to Thomas Phipps, a member of the Harvard Class of 1695.

Letter from Lemuel Shaw to Susanna Shaw, January 3, 1797

This single page handwritten letter was sent from Lemuel Shaw to his mother, Susanna, during his freshman year at Harvard. In the letter, he requested that his mother wash and return his dirty laundry and send him clothes, including a pair of overalls, some neck-handkerchiefs, and a new hat. Shaw also asked for money to be sent to pay off his debt of $21.25 to Mr. Richard Hunnewell for board and rent, $18.93 for the previous quarter’s bill, and $1.15 for Mr. Timothy Alden, the College Butler.

New England Coast : Newburyport, Massachusetts to Cape Elizabeth, Maine, Nautical Chart, 1776 (Image 1 of 2) (Raster Image)

This layer is a georeferenced raster image of the untitled, historic nautical chart: [A chart of the coast from Cape Elizabeth westwards to Newbury Harbour] (sheet originally published in 1776). The map is [sheet 25] from the Atlantic Neptune atlas Vol. 3 : Charts of the coast and harbors of New England, from surveys taken by Samuel Holland and published by J.F.W. Des Barres, 1781. Scale [ca. 1:130,000]. This layer is image 1 of 2 total images of the two sheet source map, representing the western portion of the map. Covers the coast of New England from Newburyport, Massachusetts to Kittery, Maine. The image is georeferenced to the surface of the earth and fit to the 'World Mercator' (WGS 84) projected coordinate system. All map collar information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, or other information associated with the principal map. This map shows coastal features such as harbors, inlets, rocks, channels, points, coves, shoals, islands, and more. Includes also selected land features such as cities and towns, buildings, and roads. Relief is shown by hachures. This layer is part of a selection of digitally scanned and georeferenced historic maps from The Harvard Map Collection. The entire Atlantic Neptune atlas Vol. 3 : Charts of the coast and harbors of New England has been scanned and georeferenced as part of this selection.