21,363 research outputs found
Report on Meteorological Research March 1, 1935 (m-1)
No full textThe object of the report was to elucidate in detail the various features of the research program in meteorology being carried on at the Daniel Guggenheim Airship Institute in Akron, Ohio. Mr. L. J. Fangman, of the U.S. Weather Bureau, was collaborating with the author in carrying out work such as a study of autographic records of the various meteorological elements during frontal passages with a view to the possible prediction of the intensity of the accompanying disturbance as it may affect the operation of aircraft and a study of atmospheric gustiness with a view to finding the dependence between frequency end amplitude of velocity fluctuations and the vertical temperature and velocity gradients
(Fourth) Report on Meteorological Activities at the DGAI (8-1-36)(Weather Bureau Copy)
No full textThis report is on the investigations of frontal phenomena at the Daniel Guggenheim Airship Institute in Akron, Ohio from January 1, 1935 through August 1, 1936. The investigation was carried out with the cooperation of the U.S. Bureau of Aeronautics, the U.S. Weather Bureau, the California Institute of Technology, and the Guggenheim Airship Institute. Mr. R.C. Robinson of the Weather Bureau cooperated with the author in carrying out the investigation. The object of the investigation was to determine the intensity of the atmospheric disturbances (i.e. rapidity of wind shift and gustiness) accompanying the passage of cold fronts, along with a study of the characteristics of the air masses involved and other features which might affect the intensity of the disturbance. The report treated thirty cold fronts which passed the station during 1935 to 1936
Archives and Images as Repositories of Time, Language, and Forms from the Past: A Conversation with Daniel Eisenberg
No full textDaniel Akech
No full textabstract: Daniel was a little boy when the war came to his village. He witnessed people being shot and running for shelter. There was no food or water so he drank urine and ate tree leaves.
“Lost Boys Found” is an ongoing, interdisciplinary project that is collecting, recording and archiving the oral histories of the Lost Boys/Girls of Sudan. The collection is a work-in-progress, seeking to record the oral history of as many Lost Boys/Girls as are willing, and will be used in a future book.Age: 24Region: Upper NileThis picture and bio was donated to the "Lost Boys Found" oral history project from The Arizona Lost Boys Cente
Daniel Emmett postcard
No full textPostcard of Daniel Emmett and his home in Mount Vernon, Ohio. Emmett is considered to be the author of the antebellum song "Dixie," written in 1859, which became the unofficial song of the Confederate soldiers during the American Civil War. He was born in Mount Vernon in 1815 and taught himself the fiddle, and later became associated with minstrel shows and helped to define that genre. Minstrel shows traveled around the United States, presenting skits and musical performances. Emmett also composed many other songs, including "Old Dan Tucker," "Turkey in the Straw," and "The Blue Tail Fly." He died in 1904
Daniel Jau Maper
No full textabstract: Daniel Jau Maper was herding cattle when Arabs attacked his village.
“Lost Boys Found” is an ongoing, interdisciplinary project that is collecting, recording and archiving the oral histories of the Lost Boys/Girls of Sudan. The collection is a work-in-progress, seeking to record the oral history of as many Lost Boys/Girls as are willing, and will be used in a future book.Age: 27Region: Upper NileThis picture and bio was donated to the "Lost Boys Found" oral history project from The Arizona Lost Boys Cente
Daniel A. Ngor
No full textWhen Daniel was five years old Arab soldiers attacked his village.
“Lost Boys Found” is an ongoing, interdisciplinary project that is collecting, recording and archiving the oral histories of the Lost Boys/Girls of Sudan. The collection is a work-in-progress, seeking to record the oral history of as many Lost Boys/Girls as are willing, and will be used in a future book.Age : 23Region: Upper NileThis picture and bio was donated to the "Lost Boys Found" oral history project from The Arizona Lost Boys Cente
Thermal-hydraulic characterization of single- and two-phase immersion cooling for electronic modules
No full textThe continued growth in power density and integration level of electronic systems has created severe challenges for thermal management. High-performance processors, power electronics, and dense printed circuit board (PCB) assemblies routinely dissipate heat fluxes that exceed the capabilities of conventional air-cooled heat sinks and even many single-phase liquid cooling solutions. At the same time, reliability requirements and space constraints in data centers, defense systems, and transportation electronics demand compact, robust, and electrically safe cooling schemes.
Immersion cooling in dielectric fluids has emerged as a promising approach to address these needs. By directly submerging electronic assemblies in a thermally stable, electrically insulating liquid, immersion cooling minimizes thermal interface resistances and enables both single-phase convective cooling and nucleate boiling at the device surfaces. However, the detailed thermal-hydraulic behavior of immersed, spatially distributed heat sources on a PCB remains poorly characterized, especially when complex flow geometries, buoyancy effects, and device-to-device interactions are present.
This thesis experimentally investigates single- and two-phase immersion cooling of a representative multi-device PCB in a commercially available dielectric fluid. The board is housed inside a flow channel with adjustable wall spacing and operated in a closed loop that provides controlled flow rate, inlet temperature, and system pressure. Eight surface-mounted power devices are arranged in a rotated I-shape configuration, allowing the influence of upstream devices, channel width, and flow rate on junction temperature to be studied systematically. Single-phase experiments characterize the relationship between heat flux, temperature rise, and pressure drop over a range of Reynolds numbers and channel geometries. Two-phase tests extend this framework to boiling conditions, characterizing the onset of nucleate boiling, the progression of boiling along the device array, and qualitative limits where dryout or instability is observed.
The results demonstrate that immersion cooling can provide low junction-to-fluid thermal resistance at moderate flow rates, but that the detailed flow topology and device placement strongly influence thermal uniformity and maximum temperature. In single-phase operation, decreasing the channel gap reduces thermal resistance but significantly increases pressure drop. Upstream devices tend to run warmer and influence downstream devices through both forced and buoyancy-driven recirculation. Under boiling conditions, the onset of nucleate boiling is highly non-uniform across devices, and local heat removal is enhanced where bubbly or churn flow is sustained. Based on these observations, the thesis proposes qualitative design guidelines for immersed board layouts, channel geometries, and operating conditions, and outlines directions for future work on more detailed flow visualization and modeling.Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2026-02-19 without embargo termsThe student, Daniel Farhat, accepted the attached license on 2025-12-05 at 09:43.The student, Daniel Farhat, submitted this Thesis for approval on 2025-12-05 at 09:58.This Thesis was approved for publication on 2025-12-08 at 10:43.DSpace SAF Submission Ingestion Package generated from Vireo submission #23078 on 2026-02-19 at 18:29:4
Personal Papers (MS 80-0002)
No full textLetter from Mary T. Steyn of The Readers Digest to Daniel W. Kempner providing some information on the author of an article he was asking about
Meet Daniel Melnick author of The Ash Tree
No full textMeet Daniel Melnick author of The Ash Tree. It tells a timeless story of the romance and marriage between an American Armenian girl and an immigrant who survived the 1915 Armenian Genocide in Turkey. In the aftermath of the Genocide from the 20s through the early 70s, the couple and their three children become vivid, quintessentially American characters, only for tragedy to find them again, echoing the staggering losses of 1915. The cover painting with its frayed, whitewashed frame is by the author’s wife, Jeanette Arax Melnick, and the novel is based partly on the lives of her family. Combining history and fictionalized memoir, The Ash Tree is an important, beautifully written novel of survival, new life, and heartbreak. Available from independent bookstores, Barnes and Noble, and Amazon.com. Further information at www.danielmelnick.com. Price: $25. ISBN: 9780981854762
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