280,136 research outputs found
Fiber design for high-power low-cost Yb:Al-doped fiber laser operating at 980nm
No full textWe investigated an Yb:Al-doped depressed-clad hollow optical fiber (DCHOF) for cladding-pumped 980nm laser operation. With a careful design, the nonzero fundamental-mode cutoff characteristics of a DCHOF allows the competing 1030-1060nm emission to be filtered out, despite being quite close to 980nm. The laser yielded over 3W of output power in a diffraction limited beam (M -parameter degrades to 2.7, as a result of increased cladding-mode lasing, as the cladding thickness is reduced
Letter from J. R. Eakin to Arthur G. Ringland
No full textLetter (copy) from J. R. Eakin to Arthur C. Ringland about the alignment of 40 acres near the Buggeln ranch
Letter from Arno B. Cammerer to J. R. Eakin
No full textLetter from Arno B. Cammerer to J. R. Eakin describing the procedure for purchasing Bright Angel Trail
Letter from J. R. Eakin to Carl Hayden
No full textLetter from J. R. Eakin to Carl T. Hayden concerning access to Rowe Well and the canyon
Letter from J. R. Eakin to Stephen Mather
No full textLetter from J. R. Eakin to Stephen T. Mather about expenses and reconstruction of the Kaibab Trail
Letter from Carl Hayden to J. R. Eakin
No full textLetter from Carl T. Hayden to J. R. Eakin regarding changes to the Grand Canyon National Park boundaries and the purchase of lands from William Randolph Hearst
Adaptive PDE Observer for Battery SOC/SOH Estimation
No full textThis paper develops an adaptive PDE observer for battery state-of-charge (SOC) and state-of-health (SOH) estimation. Real-time state and parameter information enables operation near physical limits without compromising durability, thereby unlock-ing the full potential of battery energy storage. SOC/SOH esti-mation is technically challenging because battery dynamics are governed by electrochemical principles, mathematically modeled by partial differential equations (PDEs). Simultaneous state and parameter estimation is extremely challenging in PDE models. Consequently, several new theoretical ideas are developed, inte-grated together, and tested. These include a backstepping PDE state estimator, a Padé-based parameter identifier, nonlinear pa-rameter sensitivity analysis, and adaptive inversion of nonlinear output functions. The end result is the first combined SOC/SOH battery estimation algorithm that identifies physical system vari-ables via an electrochemical model, from measurements of voltage and current only. NOMENCLATURE A Cell cross sectional area [m2] a j Specific interfacial surface area [m2/m3] c0e Li concentration in electrolyte phase [mol/m 3] c js Li concentration in solid phase [mol/m3] c jss Li concentration at particle surface [mol/m3] c js,max Max Li concentration in solid phase [mol/m3] D js Diffusion coefficent in solid phase [m2/sec3] F Faraday’s constant [C/mol] I Input current [A] i j0 Exchange current density [V] j Positive (+) or negative (-) electrode k j Reaction rate [A·mol1.5/m5.5] L j Electrode thickness [m] nLi Total number of Li ions [mol] q Boundary input coefficient parameter R Universal gas constant [J/mol-K] R f Lumped current collector resistance [Ω] R js Particle radius [m] r Radial coordinate [m] or [m/m] T Cell temperature [K] t Time [sec] or [sec/sec] U j Equilibrium potential [V] V Output voltage [V] α j Anodic/cathodic transfer coefficient ε Diffusion parameter ε js Volume fraction of solid phase
Proposed plan to plug and abandon SOH-1, SOH-2, and SOH-4
No full textIncludes illustrations of the wells' schematics
Letter from J. R. Eakin to Stephen Mather
No full textLetter from J. R. Eaking to the National Park Service director about changes to the Grand Canyon National Park boundaries, and access to water near the Buggeln property on Desert View road
Oral History Interview with Robert J. Allison (SOH-029)
No full textDr. Robert J. Allison, a Professor of History at Suffolk University, reflects on his personal and professional accomplishments, as well as his teaching methods and relationships with past and present students, faculty, and administration. Professor Allison discusses the History Departments evolution over the years, notable colleagues and the department’s role in the university. He concludes with reflections on Suffolk’s impact on Boston and the region.https://dc.suffolk.edu/soh/1021/thumbnail.jp
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