1,721,620 research outputs found
Luike Hemmes Miscellaneous Letters, 1908-1931
No full textThe Hemmes Papers collection includes a series of letters between Professor Hemmes, his family members, and others, dated 1908 to 1951. Many of the letters are handwritten and/or in German. This record includes digitized versions of all the letters that are in Box 24, Folder 1, and retains their original numbering. This group was labeled "Letters: Misc. 1908-1931 (18 items).
Hemmes Papers Finding Aid
No full textThis is the archival finding aid for the collection of Prof. Luike J. Hemmes papers held by the Kalamazoo College Archives. The finding aid was exported from the Archives database in June 2008
Gas-fired wind power and electric hydrogen
No full textIn the seemingly endless discussions about the pros and cons of wind power even its advocates have to agree that though wind can fly, with offshore wind farms soon to become reality, this only exacerbates the problem of the winds changeability. Even now the major producers of electricity and power grid companies foresee grave difficulties from the peaks and dips in supply of this green power source. Dr Kas Hemmes of the faculty of Systems Engineering, Policy Analysis, and Management at TU Delft has managed to adapt wind power for use in the current power grid system by combining a fuel cell with a wind turbine, and by better use of the heat released by a fuel cell. Wind turbines will be producing hydrogen after all, albeit mainly from natural gas.Technology, Policy and Managemen
Comparison of the solid oxide fuel cell system for micro CHP using natural gas with a system using a mixture of natural gas and hydrogen
No full textSolid oxide fuel cell systems for combined heat and power production (SOFC μCHP) fueled by natural gas are attractive because of their high electrical and total efficiency even at small scale. The development of a hydrogen economy will increase the availability of distributed hydrogen as a pure gas. Alternatively, hydrogen may be blended with natural gas in the grid. This study investigates the performance of SOFC μCHP systems, while using a fuel varying from pure hydrogen to pure methane via mixtures of hydrogen and methane called Hythane. Flowsheet models of external as well as internal reforming fuel cell systems were developed in Cycle-Tempo simulation software. Results show that both the external as well as the internal reforming system can operated on all fuel gas compositions varying from pure hydrogen to pure methane, thus allowing for a transition towards a hydrogen economy via the mixing of hydrogen into the natural gas grid. Although the natural gas based systems have a higher electrical efficiency, the introduction of hydrogen into the gas leads to a higher total efficiency of the combined heat and power system. The addition of hydrogen into the fuel minimizes the problems of thermal stress and thermal shock associated with the use of methane in internal reforming fuel cell systems. The internal reforming system showed a higher performance compared to the external reforming system for all Hythane gas mixtures in terms of not only electrical efficiency but also in terms of thermal and total efficiency.Economics of Technology and Innovatio
The absoluteness of Christianity according to E. Troeltsch
No full textLuike Hemmes' Ph.D. dissertation written for the University of Chicago in 1924. This version includes some penciled-in annotations, likely by Hemmes, and may have been one of his draft versions prior to the submission of the final. Some pages are faint and difficult to read.University of Chicag
CDC Advisory Committee on Gamma Globulin -- 1953-54 -- United States Public Health Service -- letter, 1953-07-24
No full textLetter from Hemmes, G. D. to Sabin, Albert B. dated 1953-07-24.Sabin Collection Fair Use Policy</a
CDC Advisory Committee on Gamma Globulin -- 1953-54 -- United States Public Health Service -- letter, 1953-11-17
No full textLetter from Hemmes, G. D. to Sabin, Albert B. dated 1953-11-17.Sabin Collection Fair Use Policy</a
Dedication: The Welles Hall Mural
No full text6 p.Dedication program for the Welles Hall mural painted by Philip Evergood. The program includes a history, biography of the artist, and an interpretation by Professor Luike J. Hemmes
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