11131963 research outputs found
Sort by
"3054. La Plaza, Los Angeles", stereoview, circa 1882
No full text"3054. La Plaza, Los Angeles," by Payne, Stanton & Co., stereoview, circa 1882. The view is from Poundcake Hill looking east with the Plaza at left of center ringed by trees and containing walks. In the foreground are some homes, the Plaza Church, and the former gas works location. To the right is a portion of the Pico House hotel. Behind the Plaza and to the left are Spanish and Mexican-era adobe homes, while in the distance is the area around the Los Angeles River and Boyle Heights. While the matte has soiling, stains, damaged corners and the like, the image is clean and the overall condition is good
The Land of Sunshine, magazine, 1899-03
No full text"The Land of Sunshine," volume 10, number 4, 1899 March. The magazine is centered on themes and topics pertaining to the West and California. There is short stories, poetry and photography, some book reviews included. In addition, there are articles regarding the positive high quality of living in California. Other articles feature topics ranging from information on Southern California, hints regarding textiles, grooming, picture framing. Also included in the magazine is a Mexican folk song with musical notes included. The advertisements in the magazine range from places to visit in California, hotels, furniture, transportation and medicinal cures for consumption. It is in fair condition
Belmont school athletics, photograph, circa 1925
No full textBelmont High School baseball team, photograph, Los Angeles, California, USA, circa 1925. The photo shows the young boys standing on the steps of a brick building. The coach is possibly the man wearing eyeglasses. He is standing at the top left area, last row from the front. The reverse side of the photo has an inscription written in pencil, "34644/Belmont/1/Dull." The photo was taken by Witzel. The photo has moderate silvering mostly to the top and bottom edge, as well as minor abrasions, soiling, yellowing and a small tears. Overall the photo is in good condition
Grauman's Chinese Theatre for "Hollywood Revue of 1929," program, 1929
No full textGrauman's Chinese Theatre for "Hollywood Revue of 1929," program, 1929. On one side is program information, including show times, stars, a listing of the pieces performed in the two-part film, and other information. On the other side is a photograph of actor William Haines with a preprinted signature. With pin holes at the corners, creases, slight edge tears, and stains, the overall condition is fair
Particle simulations of colloid thruster beam
No full text2019-10-10Colloid thrusters have been widely utilized on small spacecrafts, because of their high thrust density, specific impulse, efficiency, and accurate attitude control over long periods of time. Although the physics of an electrified liquid surface has been strongly studied, the knowledge of the colloid thruster beam is very limited due to the lack of precise experimental measurements and numerical simulations. In this dissertation, state-of-the-art particle simulation models of the colloid thruster beam are developed: The Particle-Particle (PP) model aims at a high accuracy, such that its results can be treated as a baseline to provide guidance for other models; The Particle-Particle Particle-Mesh (PP-PM) hybrid model, which aims at both high accuracy and high simulation speed, is capable for simulating larger and more realistic cases. ❧ The commonly known computationally expensive PP model is first successfully applied to simulate charged droplets in colloid thruster beam. Due to the high-accuracy nature of the PP model with respect to solving particle collisions, the most trustable results of droplet dynamics are obtained. When a relatively large number of droplets are involved, OpenMP or GPU CUDA parallelization can be easily implemented with high efficiency on the PP model, because of its simple algorithm, directly applying Coulomb’s law. The details of the PP model is described in the dissertation, some characteristic simulations considering droplet breakup are carried out. In addition, a novel concept of equivalent length is introduced to reflect the extent of particle short-range interactions (collisions). From the results of the PP model, the probability density function of the equivalent length can be obtained, which suggests a sufficiently minimum mesh size for a corresponding PM model that can capture all the necessary particle collisions. ❧ The space charge effects of the colloid thrusters under the parameter range simulated are studied. The PP algorithm and code are verified through a comparison with the Child-Langmuir law and a Particle-in-Cell (PIC) method. It is found that the Child-Langmuir law is inappropriate to be applied for the scenario of colloid thrusters. Possible reasons are given and discussed. ❧ In terms of the charge neutralization, the alternating current mode of a colloid thruster is studied using the PP model for the first time. Different types of the alternating current functions are considered, and the transition time between every alternation is studied in detail. Also, a bipolar operation mode is simulated, in which two thrusters are placed side by side operating in an opposite polarity to avoid the charge accumulation on the spacecraft. Different parameters are considered to vary the space charge effects, and the simulation results indicate that the space charge effects are negligible, so the two flowing beams are not affecting each other. ❧ Based on the development of the PP model, a PP-PM hybrid model is proposed. It applies the PP model on the upstream region of the colloid thruster beam, where the beam is dense and the scale of the particle interactions is short, to maintain the high accuracy of the simulation. And, it applies the PM model on the downstream region of the beam, where the beam is diffuse and the scale of the particle interactions is long, to speed up the simulation. Due to the axially symmetric nature of the beam, the downstream PM model is developed to be 2-D cylindrical with nonuniform mesh. Comparisons between the hybrid model and the pure PP model indicate the validity of the hybrid model. Also, the sufficiently minimum mesh size found previously is verified using the hybrid model. At last, the hybrid model is compared with a multi-level Particle-in-Cell (PIC) model applied in a reference. It is found that the hybrid model produces a beam that expands more radially than that of the PIC model, due to the fact that it resolves the short-range particle interactions more accurately in the upstream region
Gross Misconduct: concerto grosso for solo violin, viola, cello, double bass, and ensemble
No full text2019-10-10I see Gross Misconduct as a culmination of the pieces I’ve written as a composer at the University of Southern California’s Thornton School of Music (2015-2019). This concerto grosso incorporates and develops conceptual and formal structures, improvisatory material, and orchestrational relationships and trends that I have explored in previous works. Most similar to Extraordinary Instruments, a violin quartet I wrote for Modern Violin Ensemble (2018), the opening violin material comes from improvising on my violin. I created a new notational system as a result of this improvisation, allowing the performer to create pitches free of the confines of the traditional diatonic system. The piece is vaguely modeled after Handel’s five-movement concerti grossi, only Gross Misconduct is a one-movement work with five sections played attacca. Perhaps one of the most consistent and noticeable qualities of the piece is its behavior of switching rapidly between the concertino (group of soloists) and the concerto grosso (ensemble), in addition to forming new subsets outside the confines of the two aforementioned groups. Gross Misconduct is my own musical reaction to behaviors in our society that result from our political climate, how we process news and information from social media, and our apparent numbness to acts of extremism
[Fredericka S.] Freund, letter, 1955, to "friends"
No full text[Fredericka S.] Freund (National Council of Jewish Women, Los Angeles Section), 615 South Manhattan Place, Los Angeles, California, USA, letter, 1955 to "friends". "We cordially invited the members of your organization, their families, and their friends to attend 'Spotlight on Brotherhood'..." -- first line
Bulletin, National Council of Jewish Women, Los Angeles Section, excerpt, 1955
No full textBulletin, National Council of Jewish Women, Los Angeles Section, excerpt, 1955 Fall. Includes advertisement for "Spotlight on Brotherhood" and images of production
Bill of Rights Commemoration Committee, copy of Bill of Rights, circa 1955
No full textBill of Rights Commemoration Committee, copy of the Bill of Rights, circa 1955. Printed and distributed by Fox Printing Company, 3120 Riverside Drive, Los Angeles, California, USA
Laurent B. Franz, The Doctor Draft Law, G. I. Joe, M. D., article
No full textLaurent B. Franz, The Doctor Draft Law, G. I. Joe, M. D., The Nation, article