9,183 research outputs found
Analytic structure of solutions to multiconfiguration equations
We study the regularity at the positions of the (fixed) nuclei of solutions
to (non-relativistic) multiconfiguration equations (including Hartree--Fock) of
Coulomb systems. We prove the following: Let {phi_1,...,phi_M} be any solution
to the rank--M multiconfiguration equations for a molecule with L fixed nuclei
at R_1,...,R_L in R^3. Then, for any j in {1,...,M} and k in {1,...,L}, there
exists a neighbourhood U_{j,k} in R^3 of R_k, and functions phi^{(1)}_{j,k},
phi^{(2)}_{j,k}, real analytic in U_{j,k}, such that phi_j(x) =
phi^{(1)}_{j,k}(x) + |x - R_k| phi^{(2)}_{j,k}(x), x in U_{j,k} A similar
result holds for the corresponding electron density. The proof uses the
Kustaanheimo--Stiefel transformation, as applied earlier by the authors to the
study of the eigenfunctions of the Schr"odinger operator of atoms and molecules
near two-particle coalescence points.Comment: 15 page
Origin of the anomaly in diffuse scattering from disordered Pt-V alloys
An explanation of the anomalous concentration dependence of diffuse
scattering from the Pt-V alloy system (splitting of the (100) short-range order
intensity peak with increasing Pt content) is proposed. The effect is
attributed to the competition between the interaction and self-energy
curvatures. A similar temperature behaviour is predicted.Comment: 5 pages, 5 EPS figures, RevTeX; minor editorial corrections, text as
publishe
Price setting in the euro area: Some stylized facts from Individual Consumer Price Data
This paper documents patterns of price setting at the retail level in the euro area, summarized in six stylized facts. First, the average euro area monthly frequency of price adjustment is 15 p.c., compared to about 25 p.c. in the US. Second, the frequency of price changes is characterized by substantial cross product heterogeneity - prices of oil and unprocessed food products change very often, while price adjustments are less frequent for processed food, non energy industrial goods and services. Third, cross country heterogeneity exists but is less pronounced. Fourth, price decreases are not uncommon. Fifth, price increases and decreases are sizeable compared to aggregate and sectoral inflation rates. Sixth, price changes are not highly synchronized across retailers. Moreover, the frequency of price changes in the euro area is related to several factors, such as seasonality, outlet type, indirect taxation, pricing practices as well as aggregate or product specific inflation.Price-setting, consumer price, frequency of price change.
Price setting in the euro area: Some stylized facts from Individual Consumer Price Data
This paper documents patterns of price setting at the retail level in the euro area. A set of stylized facts on the frequency and size of price changes is presented along with an econometric investigation of their main determinants. Price adjustment in the euro area can be summarized in six stylized facts. First, prices of most products change rarely. The average monthly frequency of price adjustment is 15 p.c., compared to about 25 p.c. in the US. Second, the frequency of price changes is characterized by substantial crossproduct heterogeneity and pronounced sectoral patterns: prices of (oilrelated) energy and unprocessed food products change very often, while price adjustments are less frequent for processed food products, nonenergy industrial goods and services. Third, crosscountry heterogeneity exists but is less pronounced. Fourth, price decreases are not uncommon. Fifth, price increases and decreases are sizeable compared to aggregate and sectoral inflation rates. Sixth, price changes are not highly synchronized across pricesetters. Moreover, the frequency of price changes in the euro area is related to a number of factors, in particular seasonality, outlet type, indirect taxation, use of attractive prices as well as aggregate or productspecific inflation.
Price setting in the euro area: some stylized facts from individual consumer price data
This paper documents patterns of price setting at the retail level in the euro area, summarized in six stylized facts. First, the average euro area monthly frequency of price adjustment is 15 p.c., compared to about 25 p.c. in the US. Second, the frequency of price changes is characterized by substantial cross product heterogeneity - prices of oil and unprocessed food products change very often, while price adjustments are less frequent for processed food, non energy industrial goods and services. Third, cross country heterogeneity exists but is less pronounced. Fourth, price decreases are not uncommon. Fifth, price increases and decreases are sizeable compared to aggregate and sectoral inflation rates. Sixth, price changes are not highly synchronized across retailers. Moreover, the frequency of price changes in the euro area is related to several factors, such as seasonality, outlet type, indirect taxation, pricing practices as well as aggregate or product specific inflation. JEL Classification: E31, D40, C25consumer price, frequency of price change, Pricesetting
Line Bundles and Curves on a del Pezzo Order
Orders on surfaces provide a rich source of examples of noncommutative
surfaces. Other than some existence results, very little is known about the
various moduli spaces that can be associated to them. Even fewer examples have
been explicitly computed. In this paper we compute the Picard and Hilbert
schemes of an order on the projective plane ramified on a union of two conics.
Our main result is that, upon carefully selecting the right Chern classes, the
Hilbert scheme is a ruled surface over a genus two curve. Furthermore, this
genus two curve is, in itself, the Picard scheme of the order
Carbon-Dot-Sensitized, Nitrogen-Doped TiO2in Mesoporous Silica for Water Decontamination through Nonhydrophobic Enrichment-Degradation Mode
Mesoporous silica synthesized from the co-condensation of tetraethoxysilane and silylated carbon dot containing amide group has been adopted as the carrier for the in-situ growth of TiO2 through an impregnation-hydrothermal crystallization process. Benefitted from the initial complexing between the titania precursor and carbon dot, highly dispersed anatase TiO2 nanoparticles can be formed inside the mesoporous channel. The hybrid material possesses ordered hexagonal mesostructure with a p6mm symmetry, high specific surface area (446.27 m2g-1), large pore volume (0.57 cm3g-1), uniform pore size (5.11 nm) and a wide absorption band between 300-550 nm. TiO2 nanocrystals are anchored to carbon dot through bonds of Ti-O-N and Ti-O-C as revealed by X-ray photoelectron spectroscopy. Moreover, the nitrogen doping of TiO2 is also verified by the formation of Ti-N bond. This composite shows excellent adsorption capability to organic 2, 4-dichlorophenol and acid orange 7 with electron-deficient aromatic ring through the electron donor-acceptor interaction between carbon dot and organics instead of hydrophobic effect as analyzed by the contact angle analysis, which can be photocatalytically recycled through visible light irradiation after the adsorption. The narrowed bandgap by nitrogen doping and the photosensitization effect of carbon dot are revealed to be co-responsible for the visible-light activity of TiO2. The adsorption capacity does not suffer obvious loss after being recycled 3 times
Broad relaxation spectrum and the field theory of glassy dynamics for pinned elastic systems
We study thermally activated, low temperature equilibrium dynamics of elastic
systems pinned by disorder using one loop functional renormalization group
(FRG). Through a series of increasingly complete approximations, we investigate
how the field theory reveals the glassy nature of the dynamics, in particular
divergent barriers and barrier distributions controling the spectrum of
relaxation times. A naive single relaxation time approximation for each
wavevector is found to be unsatisfactory. A second approximation based on a
random friction model, yields a size (L) dependent log-normal distribution of
relaxation times (mean barriers ~L^\theta and variance ~ L^{\theta/2}) and a
procedure to estimate dynamical scaling functions. Finally, we study the full
structure of the running dynamical effective action within the field theory. We
find that relaxation time distributions are non-trivial (broad but not
log-normal) and encoded in a closed hierarchy of FRG equations. A thermal
boundary layer ansatz (TBLA) appears as a consistent solution. It extends the
one discovered in the statics which was shown to embody droplet thermal
fluctuations. Although perturbative control remains a challenge, the structure
of the dynamical TBLA which encodes barrier distributions opens the way for
deeper understanding of the field theory approach to glasses
Decreased inflammatory cytokine production of antigen-specific CD4+ TÂ cells in NMDA receptor encephalitis
Anti-N-methyl-D-aspartate-receptor (NMDAR) encephalitis is the most common autoimmune encephalitis with psychosis, amnesia, seizures and dyskinesias. The disease is mediated by pathogenic autoantibodies against the NR1 subunit that disrupt NMDAR function. Antibody infusion into mouse brains can recapitulate encephalitis symptoms, while active immunization resulted also in strong T cell infiltration into the hippocampus. However, whether T cells react against NMDAR and their specific contribution to disease development are poorly understood. Here we characterized the ex vivo frequency and phenotype of circulating CD4(+) T helper (T-H) cells reactive to NR1 protein using antigen-reactive T cell enrichment (ARTE) in 24 patients with NMDAR encephalitis, 13 patients with LGI1 encephalitis and 51 matched controls. Unexpectedly, patients with NMDAR encephalitis had lower frequencies of CD154-expressing NR1-reactive T-H cells than healthy controls and produced significantly less inflammatory cytokines. No difference was seen in T cells reactive to the synaptic target LGI1 (Leucine-rich glioma-inactivated 1), ubiquitous Candida antigens or neoantigens, suggesting that the findings are disease-specific and not related to therapeutic immunosuppression. Also, patients with LGI1 encephalitis showed unaltered numbers of LGI1 antigen-reactive T cells. The data reveal disease-specific functional alterations of circulating NMDAR-reactive T-H cells in patients with NMDAR encephalitis and challenge the idea that increased pro-inflammatory NMDAR-reactive T cells contribute to disease pathogenesis
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