Discarge compilation from The Global River Discharge (RivDIS) Project

The Global River Discharge (RivDIS) data set contains monthly discharge measurements for 1018 stations located throughout the world. The period of record varies widely from station to station, with a mean of 21.5 years. These data were digitized from published UNESCO archives by Charles Voromarty, Balaze Fekete, and B.A. Tucker of the Complex Systems Research Center (CSRC) at the University of New Hampshire. River discharge is typically measured through the use of a rating curve that relates local water level height to discharge. This rating curve is used to estimate discharge from the observed water level. The rating curves are periodically rechecked and recalibrated through on-site measurement of discharge and river stage.

Frozen orbits for scientific missions using rotating tethers

We derive a semi-analytic formulation that permits to study the long-term dynamics of fast-rotating inert tethers around planetary satellites. Since space tethers are extensive bodies they generate non-keplerian gravitational forces which depend solely on their mass geometry and attitude, that can be exploited for controlling science orbits. We conclude that rotating tethers modify the geometry of frozen orbits, allowing for lower eccentricity frozen orbits for a wide range of orbital inclination, where the length of the tether becomes a new parameter that the mission analyst may use to shape frozen orbits to tighter operational constraints.

Earth Delivery of a Small NEO with an Ion Beam Shepherd

The possibility of capturing a small Near Earth Asteroid (NEA) and deliver it to the vicinity of the Earth has been recently explored by different authors. The key advantage would be to allow a cheap and quick access to the NEA for science, resource utilization and other purposes. Among the different challenges related to this operation stands the difficulty of robotically capturing the object, whose composition and dynamical state could be problematic. In order to simplify the capture operation we propose the use of a collimated ion beam ejected from a hovering spacecraft in order to maneuver the object without direct physical contact. The feasibility of a possible asteroid retrieval mission is evaluated.

Relative Dynamics and Control of an Ion Beam Shepherd Satellite

The ion beam shepherd (IBS) is a recently proposed concept for modifying the orbit and/or attitude of a generic orbiting body in a contactless manner, which makes it a candidate technology for active space debris removal. In this paper we deal with the problem of controlling the relative position of a shepherd satellite coorbiting at small separation distance with a target debris. After deriving the orbit relative motion equations including the effect of the ion beam perturbation we study the system stability and propose different control strategies.

The SIROCO Asteroid Deflection Demonstrator

There is evidence of past Near-Earth-Objects (NEOs) impacts on Earth and several studies indicating that even relatively small objects are capable of causing large local damage, either directly or in combination with other phenomena, e.g. tsunamis. This paper describes a space mission concept to demonstrate some of the key technologies to rendezvous with an asteroid and accurately measure its trajectory during and after a deflection maneuver. The mission, called SIROCO, makes use of the recently proposed ion beam shepherd (IBS) concept where a stream of accelerated plasma ions is directed against the surface of a small NEO resulting in a net transmitted deflection force. We show that by carefully selecting the target NEO a measurable deflection can be obtained in a few weeks of continuous thrust with a small spacecraft and state of the art electric propulsion hardware.

1794, Catalogus eorum qui in Universitate Harvardiana, Cantabrigiae, in republica Massachusettensi, ab anno MDCXLII, ad annum MDCCXCIV. Alicujus gradû laureâ donati sunt.

Modern hardcover binding around original handsewn paper binding. Missing title page and first page of text. Key to abbreviations titled "Explination" on flyleaf with abbreviations for Massachusetts, New Hampshire, Connecticut, Rhode Island, Long Island, New York, Martha's Vineyard, New Jersey, Pensylvania [sic], Virginia, South Carolina, Georgia, West Indies, Great Britain, Episcopalian, and Baptist. Heavily annotated with residence locations. Asterisks added next to the names of alumni who died after the Catalogue's publication, generally in 1795. Also includes a tipped-in page at front of volume with the names of thirteen alumni of various classes from 1650 through 1756, in one hand, a note "Joseph Lovett was of Beverly, and a minister in a town of Connecticut the name of which I do not recollect. JW" in a different hand, and a final note "I believe there was a Lovett at Norwich" in the original hand.

Letter from Artemas Ward to Benjamin Stone, 1787 July 18

Artemas Ward wrote this letter to Benjamin Stone on July 18, 1787, expressing his concern about the expense of his son, Henry Dana Ward's, imminent studies at Harvard. Ward complains to Stone about his own debts and the failure of the government to honor their financial obligations to him, and he also expresses hope that the President of Harvard will allow his son to spend part of his time "keeping a school" during his freshman and sophomore years, thus earning an income sufficient to pay for his studies. Ward also suggests that it might be preferable that his son board with a respectable family, rather than live at the College.

Plea in the case of Hamilton v. Saunders, 1763

Plea in response to the plaintiff's declaration. Signed: (Charles) Pinckney, defendant's attorney, and John Rutledge (plaintiff's attorney?). Note on verso: Filed 4th May 1763.

Letter to John Kean, 8 December 1787

Letter to Kean, member of the Continental Congress, regarding the filing of a bill.

Journal of Charles Coffin and David Gurney, 1781-1785

This diary appears to have been kept by two different students, both members of the Harvard College class of 1785. The first two pages contain entries made by a student named David, believed to be David Gurney because the entries relate to the freshman curriculum and Gurney was the only student named David who was a freshman in 1781. Gurney originally titled the volume "A Journal or Diary of my concerns in College of important matters." He made entries from August 28 through October 21, 1781, recording his lessons on Virgil, Tully, Homer, the Greek Testament, Hebrew grammar, English author John Ash's "Grammar," and a text called "The Art of Speaking." At the top of one of the pages recounting these studies, Gurney wrote in large, bold letters: "About how I misspent my precious time." Charles Coffin's entries begin on October 25, 1781 and fill the bulk of the journal. Coffin kept this diary while a student at Harvard College from 1781 to 1785. Although most of Coffin's entries are written in Latin, an account of his July 1781 examination for admission to the College is in English.

Chancery decree, June 1786

Portion of decree in the case of George John Fardo v. Commissioners of Confiscation. Signed by Richard Hutson, John Mathews and John Rutledge. Filed 20 June 1786. The text of the decree itself, evidently once enclosed in this sheet, is missing.

Bulletin of the College of Charleston Museum.

1-5, 1905-1909

Bulletin of the Charleston Museum.

6-10, 1910-1914

Non omnia possumus omnes: [student theme], 1795 December 28

A somewhat playful manuscript poem describing a weary student, Tom Delve, who throws off his "tiresome books" to "exchange my hopes of fame for ease" because the world of art, unlike science, is too broad to ever master.

Student compositions of Washington Allston, 1799

Handwritten essay about procrastination and a poem celebrating spring composed by Washington Allston while he was an undergraduate at Harvard. The essay uses a story about a young Italian named Bernardo to discuss the consequences of procrastination. The essay is labeled “Allston Novem. ’99" and is titled with a quote from Edward Young's poem "The Complaint," “Procrastination is Theif [sic] of time.” Allston’s poem celebrates spring and incorporates Phillida and Corydon, two characters from Nicholas Breton’s poem “Phillida and Cordion.” The poem is titled with the verses, “Chief, lovely spring, in thee, and thy soft scenes, / The smiling God is seen” from James Thompson's poem “Spring.” The poem is labeled "Allston July 10, 1799."