55 research outputs found
The architecture of computer hardware, systems software, & networking: an infromation technology approach
No full textThis book provides the right amount of technical detail needed to succeed in the field. This accessible introduction provides the basic principles of computer system architecture and organization in the context of the current technological landscape. The author provides chapters on the fundamentals of networking as it relates to computer systems as well as all kinds of business systems, from entrepreneurial to small business, networked, distributed, and more
The architecture of computer hardware, systems software, & networking : an information technology approach
No full textThe architecture of computer hardware and systems software: an information technology approach
No full textThe Architecture of Computer Hardware and Systems Software : An information technology approach
No full textNew Yorkxvii, 750 p.; 27 c
The architecture of computer hardware, systems software, and networking : an information technology approach
No full textThe architecture of computer hardware and systems software an information technology approach
No full textIrv and Cynthia\u27s 1828 house in Hallowell is surrounded by 48 lilacs planted by
No full textIrv and Cynthia\u27s 1828 house in Hallowell is surrounded by 48 lilacs planted by former Maine governor, Dr. John Hubbard, in 1865. Lilacs at the Henry Wadsworth Longfellow home in Portland date back to the 19th century, and those in the Portland Street Cemetery in South Berwick, where author Sarah Orne Jewett is buried, date back to 1909. With details on growing lilacs in Maine
Michigan State University: The Nation\u27s First College of Communication
No full textPresents a narrative of the experience of the author at the College of Communication Arts and Sciences at Michigan State University. Strengths and weaknesses of the college; Factors contributing to the weakness of the college; Advice to college and university administrators
John Wesley and Slavery: Myth and Reality
No full text1. Was Wesley opposed to the institution of slavery? Or is that merely myth, because he only opposed the horrors of the slave trade? The reason for this question is that many eighteenth-century persons were greatly opposed to the slave trade, but had no moral difficulty with the institution of slavery.
2. If he opposed slavery, was it the abuses that troubled him, or did he reject the philosophical underpinnings of the institution itself?
3. What is truth and what is myth about Wesley\u27s contemporaries, such as his friend John Newton, author of Amazing Grace, and known as the converted slave trader?
4. Is it myth or reality that Wesley\u27s position was supported by Coke and Asbury on the American scene?
5. And finally, was Wesley\u27s influence on the ending of slavery truly significant, or is that myth
Towards High-Efficiency Thin-Film Solar Cells: from Theoretical Analysis to Experimental Exploration
No full textabstract: GaAs single-junction solar cells have been studied extensively in recent years, and have reached over 28 % efficiency. Further improvement requires an optically thick but physically thin absorber to provide both large short-circuit current and high open-circuit voltage. By detailed simulation, it is concluded that ultra-thin GaAs cells with hundreds of nanometers thickness and reflective back scattering can potentially offer efficiencies greater than 30 %. The 300 nm GaAs solar cell with AlInP/Au reflective back scattering is carefully designed and demonstrates an efficiency of 19.1 %. The device performance is analyzed using the semi-analytical model with Phong distribution implemented to account for non-Lambertian scattering. A Phong exponent m of ~12, a non-radiative lifetime of 130 ns, and a specific series resistivity of 1.2 Ω·cm2 are determined.
Thin-film CdTe solar cells have also attracted lots of attention due to the continuous improvements in their device performance. To address the issue of the lower efficiency record compared to detailed-balance limit, the single-crystalline Cd(Zn)Te/MgCdTe double heterostructures (DH) grown on InSb (100) substrates by molecular beam epitaxy (MBE) are carefully studied. The Cd0.9946Zn0.0054Te alloy lattice-matched to InSb has been demonstrated with a carrier lifetime of 0.34 µs observed in a 3 µm thick Cd0.9946Zn0.0054Te/MgCdTe DH sample. The substantial improvement of lifetime is due to the reduction in misfit dislocation density. The recombination lifetime and interface recombination velocity (IRV) of CdTe/MgxCd1-xTe DHs are investigated. The IRV is found to be dependent on both the MgCdTe barrier height and width due to the thermionic emission and tunneling processes. A record-long carrier lifetime of 2.7 µs and a record-low IRV of close to zero have been confirmed experimentally.
The MgCdTe/Si tandem solar cell is proposed to address the issue of high manufacturing costs and poor performance of thin-film solar cells. The MBE grown MgxCd1-xTe/MgyCd1-yTe DHs have demonstrated the required bandgap energy of 1.7 eV, a carrier lifetime of 11 ns, and an effective IRV of (1.869 ± 0.007) × 103 cm/s. The large IRV is attributed to thermionic-emission induced interface recombination. These understandings can be applied to fabricating the high-efficiency low-cost MgCdTe/Si tandem solar cell.Dissertation/ThesisDoctoral Dissertation Electrical Engineering 201
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