Phonons in a Nanoparticle Mechanically Coupled to a Substrate

The discrete nature of the vibrational modes of an isolated nanometer-scale solid dramatically modifies its low-energy electron and phonon dynamics from that of a bulk crystal. However, nanocrystals are usually coupled--even if only weakly--to an environment consisting of other nanocrystals, a support matrix, or a solid substrate, and this environmental interaction will modify the vibrational properties at low frequencies. In this paper we investigate the modification of the vibrational modes of an insulating spherical nanoparticle caused by a weak {\it mechanical} coupling to a semi-infinite substrate. The phonons of the bulk substrate act as a bath of harmonic oscillators, and the coupling to this reservoir shifts and broadens the nanoparticle's modes. The vibrational density of states in the nanoparticle is obtained by solving the Dyson equation for the phonon propagator, and we show that environmental interaction is especially important at low frequencies. As a probe of the modified phonon spectrum, we consider nonradiative energy relaxation of a localized electronic impurity state in the nanoparticle, for which good agreement with experiment is found.Comment: 10 pages, Revte

Shear Flows of Rapidly Flowing Granular Materials

Shear flows of granular materials are studied in an open channel. The wall shear is calculated from an open channel momentum equation which includes the density variations in the flow. An experimental technique was developed that allowed the measurement of the average density of the flow at different longitudinal locations in the channel. Two sizes of glass beads are examined and results show the variations in the wall shear as a function of various dimensionless parameters

Letter from [Ludlow] & Abby H. Patton to John Muir, 1879 Oct 5.

[1][in margin: No 6, Wall street is our address] Palace Hotel. San Francisco, Oct 5th 1879.[Friend?] Muir, The last rays of the setting sun are shinging in to our window at the Palace and perhaps it is the last sunset we shall ever see in this city of the Golden Gate. I could not think of leaving the Pacific Coast without saying good bye to you who so much love all the world about here. California you may say has made you, and you in return have made California and you are both richer for having made each other. You will preside in staying up among the great glaciers and ice fields of the Sticheen, and cant come down to the level of common folks who have only sand lots, lone mountains and golden gates 00867 [3]Mrs [Marie?] Mason received your grasshopper autograph along with your own and wrote of you in such terms that would make your eyes look bright, and heart throb more [illegible], could you read what she [deleted: wrote]- has written = Long may you live & climb mountains and 00867[Page 2][2]to look at. Oh yes I forget we have had a great General and expresident and great American traveler for a week and a city full of red, white and blue flags floating from hill top to hill top. We have not known such an oration or so much p[illegible]tion since we sent our best bl[illegible] of the north to west out the accursed slavery Talk of atonement, who ever knew a more fearful atoning for sin than that our nation North and South East and West passed through in the great Rebellion. Mr Patton and I were among the enthusiastic to welcome General Grant. Now we are going in the morning to [star?] command. Stopping at Salt Lake City, Denver – Le[illegible]ville – St Louis & other points on the way to New York. We have read of you in the Bulletin and heard of you through Dr & Mrs Kendall. By the way how you enjoy little hils at the Missionaries. Hope they or the Indians wont kill you – Do write us and do come to New York and be [lionized?] a while[in margin: Your old friends and fellow [illegible] [passengers?][illegible] Mrs [Patton?]][in margin: 73] [4]to teach other people how to love them. When you come to see us we will sit on a blanket and sing [illegible] Buns songs while you give us the [illegible] [illegible] Scotch [accent?]. I write to say more [illegible] have you to se[illegible] Mr Patton and my love and [illegible] you I bless the day that our eyes saw you and the glories of Alaska.[in margin: your friend Abby [H. Patton?]

Letter from Ludlow & Abby H. Patton to John Muir, 1885 Oct 21.

[letterhead]Oct. 21 1885 Room 874Dear Mr Muir.The Palton\u27s are once again on the Pacific coast Do you wish to see them enough to call at this great wilderness of a hotel to see them? At Chico we called on General and Mrs. Bidwell who said you were married and living at Martinez on a ranch. I send this note at a venture, hoping for an answer soon, or to have a call from yourself and Mrs Muir. We may remain here a few weeks before going to southern California.Your old friends and fellow travelers, Ludlow and Abby H. Patto

MARIAN DAYS: AN ETHNOGRAPHIC STUDY OF A VIETNAMESE RELIGIOUS PILGRIMAGE TO THE HEARTLAND OF AMERICA

For the past fifteen years Vietnamese people have made a pilgrimage from all over the United States and many other countries to the annual Marian Days Celebration held each summer in Carthage, Missouri. The observance is held to promote devotion to Mary, mother of Jesus Christ. For three days these people engage in prayer, renew their faith in God, renew old friendships, establish new ones, and attempt to preserve their culture. This annual influx of people, with a culture foreign to the area, has grown in such magnitude that it is now over four times larger than the population of the host city. The purpose of this study was to identify problems that were experienced by the visitors and the people of the host city, what had been done to prevent or eliminate problems, why the event had grown to such a degree, and what led to this area being chosen for the pilgrimage. Results of the study indicated an elaborate amount of preparation and cooperation between the local governmental agencies and the religious sponsors of the event. The research did not support the anticipated degree of resistance by the community to the celebration. However, the interest exhibited by out of state law enforcement agencies in the celebration was unexpected. Specific observations were discussed, conclusions drawn, and recommendations given regarding further studies

Identifying Agile Requirements Engineering Patterns in Industry

Agile Software Development (ASD) is gaining in popularity in today´s business world. Industry is adopting agile methodologies both to accelerate value delivery and to enhance the ability to deal with changing requirements. However, ASD has a great impact on how Requirements Engineering (RE) is carried out in agile environments. The integration of Human-Centered Design (HCD) plays an important role due to the focus on user and stakeholder involvement. To this end, we aim to introduce agile RE patterns as main objective of this paper. On the one hand, we will describe our pattern mining process based on empirical research in literature and industry. On the other hand, we will discuss our results and provide two examples of agile RE patterns. In sum, the pattern mining process identifies 41 agile RE patterns. The accumulated knowledge will be shared by means of a web application.Ministerio de Economía y Competitividad TIN2013-46928-C3-3-RMinisterio de Economía y Competitividad TIN2016-76956-C3-2-RMinisterio de Economía y Competitividad TIN2015-71938-RED

The Submarine as a Case Study in Transformation:Implications for Future Investment

The Department of Defense is sometimes guilty of glomming onto a buzzword or catchy phrase and wearing it thin. “Revolution in Military Affairs,” or RMA (a term derived, incidentally, from Soviet military writings concerning a “military- technical revolution”) certainly came close to crossing that threshold. Today, the word “transformation”—a marvelously useful and intellectually descriptive word—could similarly be at risk of exhaustion

Silent Steel: The Mysterious Death of the Nuclear Sub USS Scorpion,

Several years ago I received a phone call from Stephen Johnson asking about my service on the USS Scorpion (SSN 589), my first ship, between the fall of 1961 and the winter of 1962. He explained he was writing a book about its loss in late May 1968 with its entire crew of ninety- nine. I spoke with him at some length and sent some material about the vast “SubSafe” program changes that oc- curred within the Submarine Force af- ter the loss of USS Thresher (SSN 593) in April 1963. Silent Steel is the exqui- sitely researched result of my tiny input and that of more than 230 others— ranging from the widows of Scorpion sailors, submarine design engineers and naval architects, and a list of active- duty and retired personnel that reads like a “who’s who” of the then and now Submarine Force. The bibliography it- self spans two dozen pages of applicable books, journal articles, official reports, memorandums, and other miscella- neous correspondence

Tourmaline and tourmaline schists from Belcher hill, Colorado

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