CSO and CARMA Observations of L1157. I. A Deep Search for Hydroxylamine (NH2_2OH)

A deep search for the potential glycine precursor hydroxylamine (NH$_2$OH) using the Caltech Submillimeter Observatory (CSO) at $\lambda = 1.3$ mm and the Combined Array for Research in Millimeter-wave Astronomy (CARMA) at $\lambda = 3$ mm is presented toward the molecular outflow L1157, targeting the B1 and B2 shocked regions. We report non-detections of NH$_2$OH in both sources. We a perform non-LTE analysis of CH$_3$OH observed in our CSO spectra to derive kinetic temperatures and densities in the shocked regions. Using these parameters, we derive upper limit column densities of NH$_2$OH of $\leq1.4 \times 10^{13}$~cm$^{-2}$ and $\leq1.5 \times 10^{13}$~cm$^{-2}$ toward the B1 and B2 shocks, respectively, and upper limit relative abundances of $N_{NH_2OH}/N_{H_2} \leq1.4 \times 10^{-8}$ and $\leq1.5 \times 10^{-8}$, respectively.Comment: Accepted in the Astrophysical Journa

Disruptive Technologies in Information Sciences V

AbstractHyperdimensional computing (HDC) is a type of machine learning algorithm but is not based on the ubiquitous artificial neural network (ANN) paradigm. Instead of neurons and synapses, HDC implements online learning via very large vectors manipulated to represent correlations among the various vectors, measured by a similarity metric. Yet this approach readily affords one-shot learning, transfer learning, and native error correction, which are standing challenges for traditional ANNs. Further, implementations using binary vectors {0,1} are particularly attractive for size, weight, and power (SWaP) constrained systems, particularly disposable robotics. The paper is the first to identify and formalize a method to completely clone trained hyperdimensional behavior vectors. Using shift maps, d-1 unique clones can be made from a parent vector of length d. Additionally, expeditionary robots with extraneous sensors were trained via HDC to solve a maze even when up to 75% of the sensors fed irrelevant data to the robot. Lastly, we demonstrated the resiliency of this encoding method to random bit flips and how different network topologies contribute to dynamic reprogramming of HDC robots. HDC is presented here though not to replace ANNs but to encourage integration of these complementary ML paradigms.</p

Concert recording 2018-04-26

[Track 1]. Concerto no. 1 / Alexander Lebedev -- [Track 2]. Andante et allegro / Joseph Edouard Barat -- [Track 3]. Sonata for trombone and piano. III. Allegro ritmico e vigoroso / George McKay -- [Track 4]. Sonata in F minor, TWV 41:1. I. Andante cantabile [Track 5]. II. Allegro / Georg Philipp Telemann -- [Track 6]. Grand concerto / Friedebald Gräfe -- [Track 7]. Concerto for trombone. I. Andante maestoso - allegro molto - andante maestoso / Gordon Jacob -- [Track 8]. Concerto in one movement / Alexander Lebedev

Concert recording 2018-04-28

[Track 1] Nightmares and Daydreams -- [Track 2] Theme and Variations on a Mendelssohn Theme -- [Track 3] Bare-Bones Quartet. I. March ; II. Ethereal Serenade ; III. Finale -- [Track 4] Caged

Concert recording 2018-10-22

[Track 1]. Ballade / Frank Martin -- [Track 2]. Suite for four trombones, op. 82. I. Entrata [Track 3]. II. Lied [Track 4]. III. Dans / Flor Peeters -- [Track 5]. America the beautiful / Samuel Ward arranged by Robert Elkjer -- [Track 6]. Elegy for Mippy II / Leonard Bernstein -- [Track 7]. In memorium / Raymond Premru -- [Track 8]. Anything goes / Cole Porter arranged by Al Cobine -- [Track 9]. Suite for four trombones. I. Moderato maestoso [Track 10]. II. Andantino [Track 11]. III. Choral [Track 12]. IV. Scherzo / Desire Dondeyne -- [Track 13]. That\u27s a plenty / Lew Pollack arranged by Jack Gale

Concert recording 2019-02-07b

[Track 1]. Après un rêve from Trois melodies, op. 7 / Gabriel Fauré -- [Track 2]. The little horses / Aaron Copland -- [Track 3]. Denn es genet den Menschen wie dem Vieh from Four serious songs, op. 121 / Johannes Brahms -- [Track 4]. War song no. 2 / Charles Ives -- [Track 5]. Song to the moon from Rusalka / Antonin Dvořák -- [Track 6]. Prison / Gabriel Fauré -- [Track 7]. O Tod, wie bitter bist du from Four serious songs, op. 121 / Johannes Brahms -- [Track 8]. Dreams / Charles Ives -- [Track 9]. Der Erkönig / Schubert

Concert recording 2019-10-23

[Track 1]. Morgenmusik. I. Massig bewegt [Track 2]. II. Langsame viertel [Track 3]. III. Bewegt / Paul Hindemith -- [Track 4]. Joshua fit de Battle of Jericho / traditional, arranged by Chris Woods -- [Track 5]. Fantasy for trombone / Elizabeth Raum -- [Track 6]. Suite. I. Passepied [Track 7]. II. Arietta [Track 8]. III. March / Johann Adolphe Hesse, ed. William Glover -- [Track 9]. Suite for four trombones. I. Poco maestoso [Track 10]. II. Sarabanda [Track 11]. III. Alla marcia [Track 12]. IV. Spirituale [Track 13]. V. Finale alla fuga / Gordon Jacob -- [Track 14]. Concertino. II. Aria: Andante sostenuto [Track 15]. III. Finale: Allegro giocoso / Lars-Erik Larsson -- [Track 16]. Andante et allegro / Joseph Edouard Barat -- [Track 17]. Horizon of the Aten / Anthony Barfield -- [Track 18]. Round midnight / Thelonious Monk, arranged by Slide Hampton

Concert recording 2017-10-12

[Track 1]. Concertino for trombone, op. 4. I. Allegro maestoso / Ferdinand David -- [Track 2]. Sonata for trombone and piano. II. Andante molto sostenuto I. Allegro / Kazimierz Serocki -- [Track 3]. Selections from Pictures at an exhibition. Bydlo Promenade / Modest Mussorgsky arranged by Kenneth Gehrs -- [Track 4]. A winter\u27s night / Kevin McKee -- [Track 5]. Sonata for bass trombone. II. Andantino I. Allegro non troppo / Patrick McCarty -- [Track 6]. Achieved is the glorious work from Creation / Franz Joseph Haydn -- [Track 7]. Etude no. 15 / Marco Bordogni -- [Track 8]. Suite for four trombones. I. Intrada VI. Arietta III. Interludium / Serocki

Concert recording 2018-02-22

[Track 1]. Full tilt / Anthony DiLorenzo -- [Track 2]. Great Lakes octet. I. Shimmering under the sunlight [Track 3]. II. Frozen under winter skies [Track 4]. III. Storm-tossed [Track 5]. IV. Spring horizon / Eric Ewazen -- [Track 6]. Wayfaring stranger / arranged by Chris Woods -- [Track 7]. On a hymnsong of Philip Bliss / David Holsinger translated by William Harbinson -- [Track 8]. Allegretto from Sinfonietta / Leoš Lanáček arranged by Cory Mixdorf -- [Track 9]. October / Eric Whitacre arranged by Christopher E. Hass -- [Track 10]. Fanfare for paratroopers / Paul Creston arranged by Philip Jameson