553 research outputs found
On the compactification of hyperconcave ends and the theorems of Siu-Yau and Nadel
We show that the pseudoconcave holes of some naturally arising class of
manifolds, called hyperconcave ends, can be filled in, including the case of
complex dimension 2 . As a consequence we obtain a stronger version of the
compactification theorem of Siu-Yau and extend Nadel's theorems to dimension 2.Comment: 13 pages, AMSLaTeX, short version accepted for publication in
Inventiones Mat
Equidistribution and convergence speed for zeros of holomorphic sections of singular Hermitian line bundles
We establish the equidistribution of zeros of random holomorphic sections of
powers of a semipositive singular Hermitian line bundle, with an estimate of
the convergence speed.Comment: 23pages. Final version in Journal of Functional Analysis, (2016
Pseudorandom Switching for Adding Radar to the AFF Sensor
A document describes the proposed addition of a radar function to the Autonomous Formation Flying Sensor, making possible coarse relative-position control to prevent collisions in the event of failure of one of the spacecraft. According to the proposal, in addition to tracking GPS-like one-way ranging signals transmitted by the other normally functioning spacecraft, each spacecraft could simultaneously track the reflection of its own ranging signal from a disabled, non-transmitting spacecraft. From the round-trip travel time, the approximate distance to the disabled spacecraft could be estimated. To prevent jamming of the receiver by the transmitter on the same spacecraft, the receiver would be switched off during transmission
Moser-Trudinger inequalities and complex Monge-Ampere equation
Our aim is to give a version of the Moser-Trudinger inequality in the setting
of complex geometry. As a very particular case, our result already gives a new
Moser-Trudinger inequality for functions in the Sobolev space of a
domain in . We also deduce a new necessary condition for the complex
Monge-Ampere equation for a given measure on a compact Kahler manifold to admit
a Holder continuous solution.Comment: This is the same version as the first one. We uploaded it again
because the pdf file of our original paper could not be generated due to a
technical issu
Holographic memory using beam steering
A method, apparatus, and system provide the ability for storing holograms at high speed. A single laser diode emits a collimated laser beam to both write to and read from a photorefractice crystal. One or more liquid crystal beam steering spatial light modulators (BSSLMs) steer a reference beam, split from the collimated laser beam, at high speed to the photorefractive crystal
Weight change in control group participants in behavioural weight loss interventions: a systematic review and meta-regression study
Background Unanticipated control group improvements have been observed in intervention trials targeting various health behaviours. This phenomenon has not been studied in the context of behavioural weight loss intervention trials. The purpose of this study is to conduct a systematic review and meta-regression of behavioural weight loss interventions to quantify control group weight change, and relate the size of this effect to specific trial and sample characteristics. Methods Database searches identified reports of intervention trials meeting the inclusion criteria. Data on control group weight change and possible explanatory factors were abstracted and analysed descriptively and quantitatively. Results 85 trials were reviewed and 72 were included in the meta-regression. While there was no change in control group weight, control groups receiving usual care lost 1 kg more than control groups that received no intervention, beyond measurement. Conclusions There are several possible explanations why control group changes occur in intervention trials targeting other behaviours, but not for weight loss. Control group participation may prevent weight gain, although more research is needed to confirm this hypothesis
On the realization of linear multivariable control systems
http://archive.org/details/onrealizationofl00tha
Hepatocellular carcinoma survival in uninsured and underinsured patients.
BACKGROUND: The incidence of hepatitis C virus (HCV) and hepatocellular carcinoma (HCC) is increasing. The purpose of this study is to establish baseline survival in a medically-underserved population and to evaluate the effect of HCV seropositivity on our patient population.
MATERIALS AND METHODS: We reviewed clinicopathologic parameters from a prospective tumor registry and medical records from the Harris County Hospital District (HCHD). Outcomes were compared using Kaplan-Meier survival analysis and log-rank tests.
RESULTS: A total of 298 HCC patients were identified. The median survival for the entire cohort was 3.4 mo. There was no difference in survival between the HCV seropositive and the HCV seronegative groups (3.6 mo versus 2.6 mo, P = 0.7). Patients with a survival \u3c1 mo had a significant increase in\u3eαfetoprotein (AFP), international normalized ratio (INR), model for end-stage liver disease (MELD) score, and total bilirubin and decrease in albumin compared with patients with a survival ≥ 1 mo.
CONCLUSIONS: Survival for HCC patients in the HCHD is extremely poor compared with an anticipated median survival of 7 mo reported in other studies. HCV seropositive patients have no survival advantage over HCV seronegative patients. Poorer liver function at diagnosis appears to be related to shorter survival. Further analysis into variables contributing to decreased survival is needed
Physicomechanical properties of a zinc-reinforced glass ionomer restorative material
We compared a zinc-reinforced glass ionomer restorative material (ChemFil Rock) with three commercially available glass ionomer cements (GICs), namely, Fuji IX GP Extra, Ketac Molar Quick Aplicap, and EQUIA Fil, with respect to fracture toughness, microhardness, roughness, and abrasive wear. Fracture toughness (KIC) was tested according to ISO 13586 (n = 10). Hardness, roughness, and abrasive wear were also tested (n = 9). Data were analyzed using the Wilcoxon rank-sum test with adjustment for multiple comparisons (α = 0.05). As compared with the other GICs ChemFil Rock exhibited a greater increase in surface roughness (P 0.05). ChemFil Rock had significantly lower fracture toughness as compared with EQUIA Fil (P = 0.01) and significantly higher fracture toughness as compared with the other GICs (P < 0.02). In conclusion, as compared with the three other commercially available GICs, ChemFil Rock had intermediate fracture toughness, the lowest microhardness, and the greatest change in surface roughness
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