Winter scene of U of M campus. Library in Back Ground [sic] Ann Arbor, Mich.

Ware and Van Brunt, architect. An addition was built to the south in 1898. The 1883 portion was torn down in 1918.

Enhancing Raman signal sufficiently for practical sensing applications

Techniques are presented for enhancing weak Raman scattering signals for rapid yet accurate substance detection. Novel surfaces that allow signal enhancement quantification are described as are eye-safe methodologies that maximize the stand-off Raman detection range.

Multiwavelength observations of the black hole candidate 1E 1740.7-2942

Observations of the Galactic center region black hole candidate 1E 1740.7-2942 have been carried out using the Caltech Gamma-Ray Imaging Payload (GRIP), the Röntgensatellit (ROSAT) and the Very Large Array (VLA). These multiwavelength observations have helped to establish the association between a bright emitter of hard X-rays and soft γ-rays, the compact core of a double radio jet source, and the X-ray source, 1E 1740.7-2942. They have also provided information on the X-ray and hard X-ray spectrum.

The Galactic center region was observed by GRIP during balloon flights from Alice Springs, NT, Australia on 1988 April 12 and 1989 April 3. These observations revealed that 1E 1740.7-2942 was the strongest source of hard X-rays within ~10° of the Galactic center. The source spectrum from each flight is well fit by a single power law in the energy range 35-200 keV. The best-fit photon indices and 100 keV normalizations are: γ = (2.05 ± 0.15) and K_(100) = (8.5 ± 0.5) x 10^(-5) cm^(-2) s^(-1) keV^(-1) and γ = (2.2 ± 0.3) and K_(100) = (7.0 ± 0.7) x 10^(-5) cm^(-2) s^(-1) keV^(-1) for the 1988 and 1989 observations respectively. No flux above 200 keV was detected during either observation. These values are consistent with a constant spectrum and indicate that 1E 1740.7-2942 was in its normal hard X-ray emission state. A search on one hour time scales showed no evidence for variability.

The ROSAT HRI observed 1E 1740.7-2942 during the period 1991 March 20-24. An improved source location has been derived from this observation. The best fit coordinates (J2000) are: Right Ascension = 17^h43^m54^s.9, Declination = -29°44'45".3, with a 90% confidence error circle of radius 8".5. The PSPC observation was split between periods from 1992 September 28- October 4 and 1993 March 23-28. A thermal bremsstrahlung model fit to the data yields a column density of N_H = 1.12^(+1.51)_(0.18) x cm^(-2) , consistent with earlier X- ray measurements.

We observed the region of the Einstein IPC error circle for 1E 1740.7-2942 with the VLA at 1.5 and 4.9 GHz on 1989 March 2. The 4.9 GHz observation revealed two sources. Source 'A', which is the core of a double aligned radio jet source (Mirabel et al. 1992), lies within our ROSAT error circle, further strengthening its identification with 1E 1740.7-2942.

[21 lettres autographes signées de Léon Halévy à Jacques Léopold Heugel, 1861?-1875]

1er juillet [1861] : Promet un article sur la distribution des récompenses des Salons et des Concours où il rappellera le nom et les oeuvres de Gustave Doré dont il a "le talent en grande estime" : "Le concours de sculpture a été très fort ; le nombre de médailles est trop restreint, et les Grands Prix de Rome toujours favorisés". Evoque aussi le nom de Charles Garnier : "Le "Sujet d'Opéra" de Garnier a obtenu la première médaille d'architecture. Décision tout exceptionnelle et très flatteuse car l'oeuvre ne faisait point partie, à proprement parler, de l'Exposition d'Architecture" (NLAS-212-1). - Février 1865 : Réclame un droit de réponse à un article de Blaze de Bury paru dans le "Ménestrel". La lettre contient également la réponse de Heugel datée du 3 février 1865 dans laquelle l'éditeur lui demande d'adoucir ses propos (NLAS-212-9). - 30 juillet 1866 : Echanges et négociations au sujet de la publication de "Tobie" de Fromental Halévy. Est vexé que l'éditeur ne voie pas dans cette parution une bonne affaire et rappelle qu'il a donné au "Ménestrel" "à titre purement gratuit" un travail important sur l'oeuvre de son frère, alors que tant d'autres collègues sont très bien payés pour fournir des notices sur des compositeurs auxquelles il reproche "un esprit de dénigrement à l'égard de [s]on cher frère". Tente de rendre justice à son frère : "Je ne puis cependant m'empêcher de remarquer, quand j'entre chez vous, qu'à côté des bustes ou portraits de Meyerbeer, de Rossini, d'Auber, qui décorent vos magasins, je ne vois pas une seule image du grand maître qui fut leur égal" (NLAS-212-11). - 2 août 1866 : Le remercie pour le témoignage personnel de ses sentiments à l'égard de son "cher et regretté frère" : "cette justice que vous lui avez toujours rendue me dédommage amplement des torts que peuvent avoir envers sa mémoire plusieurs écrivains qui ont coopéré avec moi au monument que vous élevez à la gloire de nos grands maîtres français et étrangers" (NLAS-212-12). - 25 avril 1867 : au sujet des droits d'auteur de "Tobie" (NLAS-212-16). - 7 mai 1873 : Se dit heureux que son article convienne au directeur du "Ménestrel". Évoque "Carmen" de Bizet : "Ludovic [Halévy] et Meilhac sont à l'oeuvre et achèvent un poème où l'ami Bizet aura toute occasion de déployer son talent" (NLAS-212-17). - 16 juin 1875 : Le remercie pour son article consacré à "[leur] cher et infortuné Bizet" : "Impossible de rendre un hommage plus complet et en meilleurs termes à une existence si courte et si bien remplie" (NLAS-212-19). - 22 juin 1875 : Au sujet d'un opéra inachevé de Bizet, "Le Cid" : "La seule personne qui pourrait vous donner des renseignements que vous désirez sur l'opéra laissé inachevé par Bizet [...] serait sa jeune et malheureuse veuve, ma pauvre nièce Geneviève, mais elle est dans un tel état de prostration, d'accablement et d'inconsolable affliction qu'il est encore impossible de l'interroger sur un sujet si douloureux pour elle et qui raviverait de si poignants souvenirs" (NLAS-212-20). - Contient aussi 2 LAS de sa belle-soeur Léonie Halévy au sujet de sa fondation "Le Pain à bon marché" (NLAS-212-22/23)

Les oiseaux de la rue : scènes populaires en 3 actes et 4 tableaux / par MM. Lambert Thiboust et Delacour ; [musique nouvelle de M. J. Nargeot]

Collection : Théâtre contemporain illustré ; 150e livraison

Geochemical and isotopic characterization of the Bodélé Depression dust source and implications for transatlantic dust transport to the Amazon Basin

The Bodélé Depression (Chad) in the central Sahara/Sahel region of Northern Africa is the most important source of mineral dust to the atmosphere globally. The Bodélé Depression is purportedly the largest source of Saharan dust reaching the Amazon Basin by transatlantic transport. Here, we have undertaken a comprehensive study of surface sediments from the Bodélé Depression and dust deposits (Chad, Niger) in order to characterize geochemically and isotopically (Sr, Nd and Pb isotopes) this dust source, and evaluate its importance in present and past African dust records. We similarly analyzed sedimentary deposits from the Amazonian lowlands in order to assess postulated accumulation of African mineral dust in the Amazon Basin, as well as its possible impact in fertilizing the Amazon rainforest. Our results identify distinct sources of different ages and provenance in the Bodélé Depression versus the Amazon Basin, effectively ruling out an origin for the Amazonian deposits, such as the Belterra Clay Layer, by long-term deposition of Bodélé Depression material. Similarly, no evidence for contributions from other potential source areas is provided by existing isotope data (Sr, Nd) on Saharan dusts. Instead, the composition of these Amazonian deposits is entirely consistent with derivation from in-situ weathering and erosion of the Precambrian Amazonian craton, with little, if any, Andean contribution. In the Amazon Basin, the mass accumulation rate of eolian dust is only around one-third of the vertical erosion rate in shield areas, suggesting that Saharan dust is “consumed” by tropical weathering, contributing nutrients and stimulating plant growth, but never accumulates as such in the Amazon Basin. The chemical and isotope compositions found in the Bodélé Depression are varied at the local scale, and have contrasting signatures in the “silica-rich” dry lake-bed sediments and in the “calcium-rich” mixed diatomites and surrounding sand material. This unexpected finding implies that the Bodélé Depression material is not “pre-mixed” at the source to provide a homogeneous source of dust. Rather, different isotope signatures can be emitted depending on subtle vagaries of dust-producing events. Our characterization of the Bodélé Depression components indicate that the Bodélé “calcium-rich” component, identified here, is most likely released via eolian processes of sand grain saltation and abrasion and may be significant in the overall global budget of dusts carried out by the Harmattan low-level jet during the winter.

Sermones pulcherrimi : manuscript, [between 1400 and 1450]

Contains Henricus de Friemar's Sermones de tempore (sometimes attributed to his son of the same name) and extracts of Gerardus de Fracheto's Vitae fratrum ordinis praedicatorum, among other sermons, glosses, and an index arranged by subject.

Sermons on sacrament days : manuscript, [ca.1650-1685]

13 autograph manuscript sermons (undated), including table of contents.At end are three pages of notes on a sermon by Mr. Mather.

Sermons on fast days : manuscript, 1678-1684

Autograph manuscript sermons in the hand of William Adams, including table of contents. Three other pieces are by later hands: two (both 1695) by Samuel Danforth, and the last (undated) possibly by Eliphalet Adams, son of William Adams.

Junius E. Beal

Printed on verso: Photographed by Lewis, The City Artist, First Floor over Express Office, Huron Street, Ann Arbor, Mich. Handwritten: Junius E. Beal, A.A.H.S., Class of '78. (note refers to Ann Arbor High School)