1,355,693 research outputs found
Case No. 1 correspondence: Hamaker to the Commissioner of the General Land Office, October 23, 1900
No full textCorrespondence regarding the timber sale known as Case No. 1, the first formal timber sale in the nation administered by the federal government. This letter was written to the Commissioner of the General Land Office by H. G. Hamaker, Forest Supervisor, responding to a letter of October 10, 1900, to refute various criticisms of Homestake Mining Company's cutting and removal of timber. Original held at the National Archives
Case No. 1 correspondence: Hamaker to the Commissioner of the General Land Office, September 14, 1900
No full textCorrespondence regarding the timber sale known as Case No. 1, the first formal timber sale in the nation administered by the federal government. This letter was written to the Commissioner of the General Land Office by H. G. Hamaker, Forest Supervisor, accompanying a copy of Thomas J. Grier's request for a time extension for cutting and removing timber by the Homestake Mining Company. Original held at the National Archives
Case No. 1 correspondence: Hamaker to the Commissioner of the General Land Office, August 30, 1899
No full textCorrespondence regarding the timber sale known as Case No. 1, the first formal timber sale in the nation administered by the federal government. This telegram was written to the Commissioner of the General Land Office by H. G. Hamaker, Forest Supervisor, passing along a request from Homestake Mining Company asking if they may begin cutting timber upon deposit of sufficient money. Original held at the National Archives
Lila Hamaker
No full textLila Hamaker is pictured her sophomore year at Alterra High School. She is the daughter of of Levan and Mary Elizabeth Hamaker. She was killed in a automobile accident the year after this photo. She was born July 26, 1920 and died May 30, 193
Photograph of Mike Gray in a Carriage
No full textA black and white photograph of Mike Gray and another man in a carriage on the street. Hartwell & Hamaker, Phoenix, A.T
Photograph of Mike Gray in a Parked Carriage
No full textA black and white photograph of Mike Gray and another man in a carriage on the street. Hartwell & Hamaker, Phoenix, A.T
Mimicking an Atomically Thin "Vacuum Spacer" to Measure the Hamaker Constant between Graphene Oxide and Silica
No full textThe Hamaker constant between graphene oxide and silica, which quantifies the strength of van der Waals forces is determined, by mimicking a “vacuum spacer” in an atomic force microscopyforce study. It is demonstrated that, a 2D spacer is expected to yield an accurately defined separation, owing to the high atom density and strength in planar direction compared with other dimensional spacers. OLD ChemE/Organic Materials and InterfacesChemE/Advanced Soft Matte
Hamaker Constants of Iron Oxide Nanoparticles
No full textThe Hamaker constants for iron oxide nanoparticles in various media have been calculated using Lifshitz theory. Expressions for the dielectric responses of three iron oxide phases (magnetite, maghemite, and hematite) were derived from recently published optical data. The nonretarded Hamaker constants for the iron oxide nanopartides interacting across water, A(1w1) = 33 - 39 zJ, correlate relatively well with previous reports, whereas the calculated values in nonpolar solvents (hexane and toluene), A(131) = 9 29 zJ, are much lower than the previous estimates, particularly for magnetite. The magnitude of van der Waals interactions varies significantly between the studied phases (magnetite < maghemite < hematite), which highlights the importance of a thorough characterization of the particles. The contribution of magnetic dispersion interactions for particle sizes in the superparamagnetic regime was found to be negligible. Previous conjectures related to colloidal stability and self-assembly have been revisited on the basis of the new Lifshitz values of the Hamaker constants.</p
Replication Data for: Pearl millet (Pennisetum glaucum) couscous breaks down faster than wheat couscous in the Human Gastric Simulator, though has slower starch hydrolysis
No full textThis data is for a study on millet couscous gastric (stomach) simulation and emptying. The basis for this research was a previous human crossover study we did in Mali showing that traditional starchy foods made from millet and sorghum (millet and sorghum thick porridges, and millet couscous) had gastric half-emptying times that were about twice as long as other non-traditional foods (white rice, boiled white potato, well-cooked wheat-based pasta). Here, we investigated the reasons for the slow gastric emptying of millet couscous. The dataset is an Excel spreadsheet containing simulated gastric data on different couscous samples as described in the publication cited below. The data spreadsheet also includes viscosity data ("RVA" tab) and chromatography molecular size data for starch ("HPSEC" tab)
Hamaker Constants of Iron Oxide Nanoparticles
No full textThe Hamaker constants for iron oxide nanoparticles in various media have been calculated using Lifshitz theory. Expressions for the dielectric responses of three iron oxide phases (magnetite, maghemite, and hematite) were derived from recently published optical data. The nonretarded Hamaker constants for the iron oxide nanoparticles interacting across water, A1w1 = 33 – 39 zJ, correlate relatively well with previous reports, whereas the calculated values in nonpolar solvents (hexane and toluene), A131 = 9 – 29 zJ, are much lower than the previous estimates, particularly for magnetite. The magnitude of van der Waals interactions varies significantly between the studied phases (magnetite < maghemite < hematite), which highlights the importance of a thorough characterization of the particles. The contribution of magnetic dispersion interactions for particle sizes in the superparamagnetic regime was found to be negligible. Previous conjectures related to colloidal stability and self-assembly have been revisited on the basis of the new Lifshitz values of the Hamaker constants
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