21,414 research outputs found
Mechanical properties of FDM printed objects as a function of the printing parameters
No full textFused deposition modeling (FDM) three-dimensional (3D) printing is one of the most
widespread technologies in the field of additive manufacturing to fabricate objects,
prototypes or products starting from a virtual 3D model created by CAD software[1][2]. This
printing technique allows to create a 3D object by adding extruded thermoplastic material
layer by layer. The obtained products are characterized by an anisotropic behaviour[3].
Compared to those obtained through conventional production techniques, FDM 3D objects are
generally less performing from the point of view of mechanical properties[4]. For this reason,
they are mostly used as prototyping products and not as structural materials. In this work, the
experimental activity was aimed at understanding the influence of printing parameters on the
mechanical properties of samples made with FDM technology. The variation of the printing
parameters was investigated to obtain an improvement of the mechanical properties of the
samples. In fact, the effect of the optimization of the printing parameters on the mechanical
properties allows to extend the field of applicability of the objects obtained, making the
objects suitable for both functional and structural purposes
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
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The enhanced two micron emission in thulium doped tellurite glasses
No full textIn this work, we demonstrated enhanced infrared thulium emission regarding lifetime values in the novel fluorotellurite glasses in comparison with the traditional TeO2–ZnO–Na2O host. The OH concentration reduction in the novel host material established fast-diffusion regime for the 3F4 ! 3H6 emission while the same emission in ‘TZN’ host was in the frame of the diffusion-limited regime. The spectroscopic and thermo-mechanical properties of tellurite glasses showed promising features and possibility for fiber drawing
Daniel 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
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