Heterostructures of atomically thin van der Waals bonded monolayers have opened a unique platform to engineer Coulomb correlations, shaping excitonic
, Mott insulating
or superconducting phases
. In ...transition metal dichalcogenide heterostructures
, electrons and holes residing in different monolayers can bind into spatially indirect excitons
with a strong potential for optoelectronics
, valleytronics
, Bose condensation
, superfluidity
and moiré-induced nanodot lattices
. Yet these ideas require a microscopic understanding of the formation, dissociation and thermalization dynamics of correlations including ultrafast phase transitions. Here we introduce a direct ultrafast access to Coulomb correlations between monolayers, where phase-locked mid-infrared pulses allow us to measure the binding energy of interlayer excitons in WSe
/WS
hetero-bilayers by revealing a novel 1s-2p resonance, explained by a fully quantum mechanical model. Furthermore, we trace, with subcycle time resolution, the transformation of an exciton gas photogenerated in the WSe
layer directly into interlayer excitons. Depending on the stacking angle, intra- and interlayer species coexist on picosecond scales and the 1s-2p resonance becomes renormalized. Our work provides a direct measurement of the binding energy of interlayer excitons and opens the possibility to trace and control correlations in novel artificial materials.
A formal analysis of certain theoretical problems about voting, based on a three-candidate model where voters are indifferent to various alternatives, but candidates are interested in winning ...elections & seeing their most preferred alternative being realized. A specific decision problem is identified & described by an indifference trap game; it is shown that a second-best outcome is contained in the choice set of all three solutions, while the Nash equilibrium concept is compatible with the Pareto efficient outcomes of the game. An alternative scenario where candidates suffer from incumbency but voters still are indifferent to some alternatives also supports the second-best outcome. It is concluded that indifferent voters create a coordination problem for candidates, which generally results in inefficient outcomes. The inherent complexity of the decision situation cannot be sufficiently reduced to a single outcome. 3 Figures, 26 References. Modified HA
The paper elaborates the productivity paradox of information technology in order to find an answer to the question of why, contrary to expectations, the correlation between expenditures in ...information technology and economic growth is not ambiguous. To formulate an answer, the paper focuses on the network dimension of the information technology sector, more specifically, on the telecommunications industry and its regulation.
We present new results on the Eris/Dysnomia system including analysis of new images from the WFC3 instrument on the Hubble Space Telescope (HST). Seven HST orbits were awarded to program 15171 in ...January and February 2018, with the intervals between observations selected to sample Dysnomia over a full orbital period. Using relative astrometry of Eris and Dysnomia, we computed a best-fit Keplerian orbit for Dysnomia. Based on the Keplerian fit, we find an orbital period of 15.785899±0.000050 days, which is in good agreement with recent work. We report a non-zero eccentricity of 0.0062 at the 6.2-σ level, despite an estimated eccentricity damping timescale of ≤17 Myr. Considering the volumes of both Eris and Dysnomia, the new system density was calculated to be 2.43±0.05 g cm−3, a decrease of ~4% from the previous value of 2.52±0.05 g cm−3. The new astrometric measurements were high enough precision to break the degeneracy of the orbit pole orientation, and indicate that Dysnomia orbits in a prograde manner. The obliquity of Dysnomia's orbit pole with respect to the plane of Eris' heliocentric orbit was calculated to be 78.29±0.65∘ and is in agreement with previous work; the next mutual events season will occur in 2239. The Keplerian orbit fit to all the data considered in this investigation can be excluded at the 6.3-σ level, but identifying the cause of the deviation was outside the scope of this work.
•Hubble Space Telescope observations of Eris and Dysnomia were obtained in 2018.•A new orbit solution was calculated for Dysnomia.•Dysnomia's orbit has a non-zero eccentricity at the 6.2-σ level.•These data were used to break the degeneracy in Dysnomia's orbit pole orientation.•The next mutual events season will occur in 2239.
The discussion of power measures and fairness concepts follows two isolated strings of thought that have rather different traditions. This paepr argues that it is exactly this restriction that ...confuses the discussion. By making use of the theory of power indices and Binmore's theory of justice, this paper illustrates where the problem lies.
Disclosure in a Post-Spitzer World Rybka, Lawrence J; Holler, Jeffrey M
Journal of Practical Estate Planning,
02/2006, Letnik:
8, Številka:
1
Trade Publication Article
An essential planning tool for any estate planning practice, the life insurance contract remains the only financial vehicle that can safely provide significant tax-advantaged benefits at the client's ...death. However, the current standards of care for professionals providing services in this area are changing. One year ago, Eliot Spitzer, Attorney General of New York, brought a criminal indictment against international insurance broker Marsh & McLennan for unethical business practices involving group and property/casualty insurance. The substance of the allegations was that the firm steered business to insurance vendors from whom it received undisclosed additional elements of compensation. Close study of the Spitzer indictments, regulations and subpoenas issued to insurance distributors highlight 6 practices that should be significantly modified, including: 1. not presenting a quote or intentionally misquoting a vendor, 2. use of "dial-a-comp" products in a spreadsheet, and 3. undisclosed reinsurance agreements.
A system is presented which can classify unknown objects by the waveform produced upon their impact with a known object. The output of an accelerometer mounted on the known object is read into a unit ...that computes the waveform's discrete Fourier transform (DFT), which is then fed into a two-layer neural network recognition module. The specific application described observes a collision between two objects, one of which is a wooden platform while the other is made out of a different material. After being shown sample waveforms produced by collisions with three types of objects, the system can then classify new collisions with the objects within 6 ms after the impact. Both the DFT unit and the classification network are implemented with Intel's 80170NX Electrically Trainable Analog Neural Network (ETANN).< >
Abnormal cytoplasmic accumulation of Fused in Sarcoma (FUS) in neurons defines subtypes of amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD). FUS is a member of the FET ...protein family that includes Ewing's sarcoma (EWS) and TATA-binding protein-associated factor 2N (TAF15). FET proteins are predominantly localized to the nucleus, where they bind RNA and DNA to modulate transcription, mRNA splicing, and DNA repair. In ALS cases with FUS inclusions (ALS-FUS), mutations in the FUS gene cause disease, whereas FTLD cases with FUS inclusions (FTLD-FUS) do not harbor FUS mutations. Notably, in FTLD-FUS, all FET proteins accumulate with their nuclear import receptor Transportin 1 (TRN1), in contrast ALS-FUS inclusions are exclusively positive for FUS. In the present study, we show that induction of DNA damage replicates several pathologic hallmarks of FTLD-FUS in immortalized human cells and primary human neurons and astrocytes. Treatment with the antibiotic calicheamicin γ1, which causes DNA double-strand breaks, leads to the cytoplasmic accumulation of FUS, TAF15, EWS, and TRN1. Moreover, cytoplasmic translocation of FUS is mediated by phosphorylation of its N terminus by the DNA-dependent protein kinase. Finally, we observed elevated levels of phospho-H2AX in FTLD-FUS brains, indicating that DNA damage occurs in patients. Together, our data reveal a novel regulatory mechanism for FUS localization in cells and suggest that DNA damage may contribute to the accumulation of FET proteins observed in human FTLD-FUS cases, but not in ALS-FUS.
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