Recursos de colección

Caltech Authors (160.918 recursos)

Repository of works by Caltech published authors.

Group = Resnick Institute

Mostrando recursos 1 - 5 de 5

  1. Analysis of Surface Materials by the Curiosity Mars Rover: Introduction

    Grotzinger, John P.
    The 6 August 2012 arrival of the Curiosity Rover on the surface of Mars delivered the most technically advanced geochemistry laboratory ever sent to the surface of another planet. Its 10 instruments (1)* were commissioned for operations and were tested on a diverse set of materials, including rocks, soils, and the atmosphere, during the first 100 martian days (sols) of the mission. The five articles presented in full in the online edition of Science (www.sciencemag.org/extra/curiosity), with abstracts in print (pp. 1476–1477), describe the mission’s initial results, in which Curiosity’s full laboratory capability was used.
    - 26-oct-2017

  2. Swing dynamics as primal-dual algorithm for optimal load control

    Zhao, Changhong; Topcu, Ufuk; Low, Steven
    In electricity transmission networks, loads can provide flexible, fast responsive, and decentralized sources for frequency regulation and generation-demand balancing, complementary to generation control. We consider an optimal load control (OLC) problem in a transmission network, when a disturbance in generation occurs on an arbitrary subset of the buses. In OLC, the frequency-insensitive loads are reduced (or increased) in real-time in a way that balances the generation shortfall (or surplus), resynchronizes the bus frequencies, and minimizes the aggregate disutility of load control. We propose a frequency-based load control mechanism and show that the swing dynamics of the network, together with the...
    - 02-nov-2017

  3. Some Problems in Demand Side Management

    Gan, Lingwen; Jiang, Libin; Low, Steven; Topcu, Ufuk; Zhao, Changhong
    We present a sample of problems in demand side management in future power systems and illustrate how they can be solved in a distributed manner using local information. First, we consider a set of users served by a single load-serving entity (LSE). The LSE procures capacity a day ahead. When random renewable energy is realized at delivery time, it manages user load through real-time demand response and purchases balancing power on the spot market to meet the aggregate demand. Hence optimal supply procurement by the LSE and the consumption decisions by the users must be coordinated over two timescales, a day ahead and in real time, in the presence of...
    - 02-nov-2017

  4. A diverse set of family 48 bacterial glycoside hydrolase cellulases created by structure-guided recombination

    Smith, Matthew A.; Rentmeister, Andrea; Snow, Christopher D.; Wu, Timothy; Farrow, Mary F.; Mingardon, Florence; Arnold, Frances H.
    Sequence diversity within a family of functional enzymes provides a platform for elucidating structure–function relationships and for protein engineering to improve properties important for applications. Access to nature's vast sequence diversity is often limited by the fact that only a few enzymes have been characterized in a given family. Here, we recombined the catalytic domains of three glycoside hydrolase family 48 bacterial cellulases (Cel48; EC 3.2.1.176) – Clostridium cellulolyticum CelF, Clostridium stercorarium CelY, and Clostridium thermocellum CelS – to create a diverse library of Cel48 enzymes with an average of 106 mutations from the closest native enzyme. Within this set,...
    (application/zip) - 12-sep-2017

  5. Evaluation of the Thermodynamic Properties of H_2 Binding in Solid State Dihydrogen Complexes [M(η^2‑H_2)(CO)dppe_2][BArF^(24)] (M = Mn, Tc, Re): An Experimental and First Principles Study

    Abrecht, David G.; Fultz, Brent
    The solid state complex [Mn(CO)dppe_2][BArF^(24)] was synthesized, and the thermodynamic behavior and properties of the hydrogen absorption reaction to form the dihydrogen complex [Mn(η^2-H_2)dppe_2][BArF^(24)] were measured over the temperature range 313–373 K and pressure range 0–600 Torr using the Sieverts method. The absorption behavior was accurately described by Langmuir isotherms, and enthalpy and entropy values of ΔH° = −52.2 kJ/mol and ΔS° = −99.6 J/(mol K) for the absorption reaction were obtained from the Langmuir equilibrium constant. The observed binding strength was similar to metal hydrides and other organometallic complexes, despite rapid kinetics suggesting a site-binding mechanism similar to physisorption...
    (application/pdf) - 28-ago-2017

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