Repository of works by Caltech published authors.
Status = Published
Mostrando recursos 1 - 20 de 35.760
On the consistency of data with bargaining theories - Chambers, Christopher P.; Echenique, Federico
We develop observable restrictions of well known theories of bargaining over money. We suppose that we observe a finite data set of bargaining outcomes, including data on allocations and disagreement points, but no information on utility functions. We ask when a given theory could generate the data. We show that if the disagreement point is fixed and symmetric, the Nash, utilitarian, and egalitarian max-min bargaining solutions are all observationally equivalent. Data compatible with these theories are, in turn, characterized by the property of co-monotonicity of bargaining outcomes.
We establish different tests for each of the theories under consideration in the case...
Gas lines from the 5-Myr old optically thin disk around HD141569A - Herschel observations and modeling - Thi, W.-F.; Pinte, C.; Pantin, E.; Augereau, J. C.; Meeus, G.; Ménard, F.; Martin-Zaїdi, C.; Woitke, P.; Riviere-Marichalar, P.; Kamp, I.; Carmona, A.; Sandell, G.; Eiroa, C.; Dent, W.; Montesinos, B.; Aresu, G.; Meijerink, R.; Spaans, M.; White, G.; Ardila, D.; Lebreton, J.; Mendigutía, I.; Brittain, S.
Context. The gas- and dust dissipation processes in disks around young stars remain uncertain despite numerous studies. At the distance of ~99–116 pc, HD 141569A is one of the nearest HerbigAe stars that is surrounded by a tenuous disk, probably in transition between a massive primordial disk and a debris disk. Atomic and molecular gases have been found in the structured 5-Myr old HD 141569A disk, making HD 141569A the perfect object within which to directly study the gaseous atomic and molecular component.
Aims. We wish to constrain the gas and dust mass in the disk around HD 141569A.
Methods. We observed the fine-structure lines of O I...
Modeling the BOLD correlates of competitive neural dynamics - Bonaiuto, James; Arbib, Michael A.
Winner-take-all models are commonly used to model decision-making tasks where one outcome must be selected from several competing options. Related random walk and diffusion models have been used to explain such processes and apply them to psychometric and neurophysiological data. Recent model-based fMRI studies have sought to find the neural correlates of decision-making processes. However, due to the fact that hemodynamic responses likely reflect synaptic rather than spiking activity, the expected BOLD signature of winner-take-all circuits is not clear. A powerful way to integrate data from neurophysiology and brain imaging is by developing biologically plausible neural network models constrained and...
Spatially resolved velocity maps of halo gas around two intermediate-redshift galaxies - Chen, Hsiao-Wen; Gauthier, Jean-René; Sharon, Keren; Johnson, Sean D.; Nair, Preethi; Liang, Cameron J.
Absorption-line spectroscopy of multiply-lensed QSOs near a known foreground galaxy provides a unique opportunity to go beyond the traditional one-dimensional application of QSO probes and establish a crude three-dimensional map of halo gas around the galaxy that records the line-of-sight velocity field at different locations in the gaseous halo. Two intermediate-redshift galaxies are targeted in the field around the quadruply-lensed QSO HE 0435−1223 at redshift z = 1.689, and absorption spectroscopy along each of the lensed QSOs is carried out in the vicinities of these galaxies. One galaxy is a typical, star-forming L* galaxy at z = 0.4188 and projected...
Solar Dance: Van Gogh, Forgery, and the Eclipse of Certainty [Book Review] - Brewer, John
Modris Eksteins’s Solar Dance centers on one of the most famous art forgery cases of
the twentieth century, the trial in Weimar Berlin of Otto Wacker, dancer turned art dealer,
for the forgery of thirty-four works attributed to Vincent Van Gogh. Wacker’s fakes were
first detected in late 1927, when they were to appear in a major exhibition of the painter’s
works held in collaboration with the famous Cassirer gallery, which had done so
much to make Van Gogh one of the most admired modern painters in Germany. Eventually
brought to trial in April 1932, Wacker was found guilty of knowingly passing off
fakes; his appeal failed,...
Tribute to Carleton Moore - Wasserburg, G. J.
This issue of Meteoritics presents a new format and a new
editor. It represents change and growth of the diverse interests
of The Meteoritical Society, but it is based on the traditions of
the Society and the solid foundation which has been established
by Carleton B. Moore. His footprint (or regmaglypt) first appeared
on the color-coded covers of Meteoritics in 1969-the
year of Allende and Apollo. For almost two decades, the editor
was Carleton Moore and the focus of the Society was seated at
the Center for Meteorite Studies at Arizona State University.
The tradition which grew out of the fabulous Nininger collection
and the careful but good-humored attention to...
Neptune's cosmic ray cutoff - Selesnick, R. S.; Stone, E. C.
The Voyager 2 cosmic ray experiment observed the signature of a magnetic cutoff of cosmic ray protons immediately after the closest approach to Neptune. The cutoff signature shows that the simultaneous observation of a trapped particle dropout could not have occurred at high magnetic latitudes, but is likely to be a drift shadow of the planet caused by the large offset of the particle drift shells. The OTD2 dipole model of Neptune's magnetic field predicts a drift shadow at approximately the correct times. In addition, the cutoff signature is similar to that predicted by the OTD2 model, although the model...
Stage variability of the Missouri River as recorded by Lewis and Clark - Ehlmann, Bethany L.; Criss, Robert E.
The journals of Meriwether Lewis and William Clark during the 1803-1806 Corps of Discovery
contain detailed records of meteorological conditions and Missouri River stage levels for the winter
camps at Camp DuBois (1803-4) at the mouth of the Missouri, and at Fort Mandan (1804-5), now
in North Dakota near river mile 1372. Their measurements provide unique insight on the Missouri
River prior to the profound modification of its channel by the Army Corps of Engineers starting
in 1832, the regulation of its flow by six huge main-stem reservoirs constructed between 1937
and 1963, and the profound changes to its watershed following European settlement.
Contract enforcement in Russian serf society, 1750-1860 - Dennison, Tracy
This article examines questions about contract enforcement in the absence of formal legal institutions, using archival evidence for one particular rural society in pre-emancipation Russia. The evidence presented indicates that enforcement services provided by the local landlord made it possible for Russians from different socioeconomic and legal strata to engage in a wide variety of contractual transactions. However, this system had significant drawbacks in that the poorest serfs could not afford these services and no serf had recourse beyond his local estate.
The evolution of the dust temperatures of galaxies in the SFR–M_∗ plane up to z ~ 2 - Magnelli, B.; Bock, J.
We study the evolution of the dust temperature of galaxies in the SFR− M∗ plane up to z ~ 2 using far-infrared and submillimetre observations from the Herschel Space Observatory taken as part of the PACS Evolutionary Probe (PEP) and Herschel Multi-tiered Extragalactic Survey (HerMES) guaranteed time key programmes. Starting from a sample of galaxies with reliable star-formation rates (SFRs), stellar masses (M_∗) and redshift estimates, we grid the SFR− M_∗parameter space in several redshift ranges and estimate the mean dust temperature (T_(dust)) of each SFR–M_∗ − z bin. Dust temperatures are inferred using the stacked far-infrared flux densities (100–500 ...
Planck intermediate results XIII. Constraints on peculiar velocities - Ade, P. A. R.; Bock, J. J.; Doré, O.; Hildebrandt, S. R.; Rusholme, B.; Crill, B. P.
Using Planck data combined with the Meta Catalogue of X-ray detected Clusters of galaxies (MCXC), we address the study of peculiar motions by searching for evidence of the kinetic Sunyaev-Zeldovich effect (kSZ). By implementing various filters designed to extract the kSZ generated at the positions of the clusters, we obtain consistent constraints on the radial peculiar velocity average, root mean square (rms), and local bulk flow amplitude at different depths. For the whole cluster sample of average redshift 0.18, the measured average radial peculiar velocity with respect to the cosmic microwave background (CMB) radiation at that redshift, i.e., the kSZ...
Outer Bounds and a Functional Study of the Edge Removal Problem - Lee, Eun Jee; Langberg, Michael; Effros, Michelle
In this paper, we investigate the impact of a single edge on the capacity region of a network of error-free, point-to-point links. A family of networks and edges is said to exhibit the “edge removal property” if for any network and edge in the family, removing a δ-capacity edge changes the capacity region by at most δ in each dimension. We derive a sufficient condition on network coding functions to guarantee that the edge removal property holds when the network is operated using functions satisfying the condition. Also, we extend the family of network capacity bounds for which it is...
Anthracyclines Induce DNA Damage Response-Mediated Protection against Severe Sepsis - Figueiredo, Nuno; Zhao, Jimmy L.; Baltimore, David
Severe sepsis remains a poorly understood systemic inflammatory condition with high mortality rates and limited therapeutic options in addition to organ support measures. Here we show that the clinically approved group of anthracyclines acts therapeutically at a low dose regimen to confer robust protection against severe sepsis in mice. This salutary effect is strictly dependent on the activation of DNA damage response and autophagy pathways in the lung, as demonstrated by deletion of the ataxia telangiectasia mutated (Atm) or the autophagy-related protein 7 (Atg7) specifically in this organ. The protective effect of anthracyclines occurs irrespectively of pathogen burden, conferring disease...
Rapid Earthquake Characterization Using MEMS Accelerometers
and Volunteer Hosts Following the M 7.2 Darfield, New Zealand, Earthquake - Lawrence, Jesse F.; Cochran, Elizabeth S.; Chung, Angela; Kaiser, Anna; Christensen, Carl M.; Allen, Richard; Baker, Jack W.; Fry, Bill; Heaton, Thomas; Kilb, Deborah; Kohler, Monica D.; Taufer, Michela
We test the feasibility of rapidly detecting and characterizing earthquakes with the Quake‐Catcher Network (QCN) that connects low‐cost microelectromechanical systems accelerometers to a network of volunteer‐owned, Internet‐connected computers. Following the 3 September 2010 M 7.2 Darfield, New Zealand, earthquake we installed over 180 QCN sensors in the Christchurch region to record the aftershock sequence. The sensors are monitored continuously by the host computer and send trigger reports to the central server. The central server correlates incoming triggers to detect when an earthquake has occurred. The location and magnitude are then rapidly estimated from a minimal set of received ground‐motion parameters....
Developing Image Processing Meta-Algorithms with Data Mining of Multiple Metrics - Leung, Kelvin; Cunha, Alexandre; Toga, A. W.; Parker, D. Stott
People often use multiple metrics in image processing, but here we take a novel approach of mining the values of batteries of metrics on image processing results. We present a case for extending image processing methods to incorporate automated mining of multiple image metric values. Here by a metric we mean any image similarity or distance measure, and in this paper we consider intensity-based and statistical image measures and focus on registration as an image processing problem. We show how it is possible to develop meta-algorithms that evaluate different image processing results with a number of different metrics and mine...
Process Simulation and Control Optimization of a Blast Furnace Using Classical Thermodynamics Combined to a Direct Search Algorithm - Harvey, Jean-Phillipe; Gheribi, Aïmen
Several numerical approaches have been proposed in the literature to simulate the behavior of modern blast furnaces: finite volume methods, data-mining models, heat and mass balance models, and classical thermodynamic simulations. Despite this, there is actually no efficient method for evaluating quickly optimal operating parameters of a blast furnace as a function of the iron ore composition, which takes into account all potential chemical reactions that could occur in the system. In the current study, we propose a global simulation strategy of a blast furnace, the 5-unit process simulation. It is based on classical thermodynamic calculations coupled to a direct...
Perturbations to the Ubiquitin Conjugate Proteome in Yeast Δubx Mutants Identify Ubx2 as a Regulator of Membrane Lipid Composition - Kolawa, Natalie; Sweredoski, Michael J.; Graham, Robert L. J.; Oania, Robert; Hess, Sonja; Deshaies, Raymond J.
Yeast Cdc48 (p97/VCP in human cells) is a hexameric AAA ATPase that is thought to use ATP hydrolysis to power the segregation of ubiquitin-conjugated proteins from tightly bound partners. Current models posit that Cdc48 is linked to its substrates through adaptor proteins, including a family of seven proteins (13 in human) that contain a Cdc48-binding UBX domain. However, few substrates for specific UBX proteins are known, and hence the generality of this hypothesis remains untested. Here, we use mass spectrometry to identify ubiquitin conjugates that accumulate in cdc48 and ubx mutants. Different ubx mutants exhibit unique patterns of conjugate accumulation...
Effect of dry oxidation on the energy gap and chemical composition of CVD graphene on nickel - Aria, Adrianus I.; Gani, Adi W.; Gharib, Morteza
The findings presented herein show that the electronic properties of CVD graphene on nickel can be altered from metallic to semiconducting by introducing oxygen adsorbates via UV/ozone or oxygen plasma treatment. These properties can be partially recovered by removing the oxygen adsorbates via vacuum annealing treatment. The effect of oxidation is studied by scanning tunneling microscopy/spectroscopy (STM/STS) and X-ray photoelectron spectroscopy (XPS). As probed by STM/STS, an energy gap opening of 0.11–0.15 eV is obtainable as the oxygen/carbon atomic ratio reaches 13–16%. The corresponding XPS spectra show a significant monotonic increase in the concentration of oxygenated functional groups due to...
L∞-Multivariate approximation theory - Schultz, Martin H.
This paper is concerned with multivariate analogues of
many standard results in the L∞-approximation theory of functions of one real variable, cf. , , , ,  and . In particular, asymptotic bounds are given for the distance of a given smooth function from various finite-dimensional spaces such as multivariate trigonometric polynomials, multivariate algebraic polynomials and multivariate polynomial spline functions.
Fe^(2+)-Ti^(4+) charge transfer in stoichiometric Fe^(2+),Ti^(4+) -minerals - Mattson, Stephanie M.; Rossman, George R.
Optical absorption spectra are presented for taramellite, traskite and neptunite, all of which have both Fe^(2+) and Ti^(4+) as major elements. The spectra of each of these minerals are dominated by a single, intense absorption band in the 415 to 460 nm region with 7000 to 9000 cm^(−1) half width. These transitions, assigned to Fe^(2+)-Ti^(4+) intervalence charge transfer, showed little difference in intensity at 80 and 300 K and have molar absorptivities which range from ∼100 to ∼1300 M^(−1) cm^(−1). The Fe^(2+)-Ti^(4+) absorptions in these standards generally compare well to other mineral spectra in which Fe^(2+) — Ti^(4+) intervalence absorption...