7,923 research outputs found
Robust nonparametric inference for the median
We consider the problem of constructing robust nonparametric confidence
intervals and tests of hypothesis for the median when the data distribution is
unknown and the data may contain a small fraction of contamination. We propose
a modification of the sign test (and its associated confidence interval) which
attains the nominal significance level (probability coverage) for any
distribution in the contamination neighborhood of a continuous distribution. We
also define some measures of robustness and efficiency under contamination for
confidence intervals and tests. These measures are computed for the proposed
procedures.Comment: Published at http://dx.doi.org/10.1214/009053604000000634 in the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org
Is J 133658.3-295105 a Radio Source at z >= 1.0 or at the Distance of M 83?
We present Gemini optical imaging and spectroscopy of the radio source J
133658.3-295105. This source has been suggested to be the core of an FR II
radio source with two detected lobes. J 133658.3-295105 and its lobes are
aligned with the optical nucleus of M 83 and with three other radio sources at
the M 83 bulge outer region. These radio sources are neither supernova remnants
nor H II regions. This curious configuration prompted us to try to determine
the distance to J 133658.3-295105. We detected H_alpha emission redshifted by ~
130 km s^-1 with respect to an M 83 H II region 2.5" east-southeast of the
radio source. We do not detect other redshifted emission lines of an optical
counterpart down to m_i = 22.2 +/- 0.8. Two different scenarios are proposed:
the radio source is at z >= 2.5, a much larger distance than the previously
proposed lower limit z >= 1.0, or the object was ejected by a gravitational
recoil event from the M 83 nucleus. This nucleus is undergoing a strong
dynamical evolution, judging from previous three-dimensional spectroscopy.Comment: 6 pages, 4 figure
A fruitful fly forward : the role of the fly in drug discovery for neurodegeneration
AD, Alzheimer’s disease; APP, amyloid precursor protein; BBB, blood brain barrier; GFP, green fluorescent protein; HTS, high-throughput screening; HD, Huntington’s disease; LB, Lewy bodies; PD, Parkinson’s disease; PolyQ, Polyglutamine; RNAi, RNA interference; SNCA, α-synuclein gene; UAS, Upstream Activating Sequence.peer-reviewe
Investigating SRAM PUFs in large CPUs and GPUs
Physically unclonable functions (PUFs) provide data that can be used for
cryptographic purposes: on the one hand randomness for the initialization of
random-number generators; on the other hand individual fingerprints for unique
identification of specific hardware components. However, today's off-the-shelf
personal computers advertise randomness and individual fingerprints only in the
form of additional or dedicated hardware.
This paper introduces a new set of tools to investigate whether intrinsic
PUFs can be found in PC components that are not advertised as containing PUFs.
In particular, this paper investigates AMD64 CPU registers as potential PUF
sources in the operating-system kernel, the bootloader, and the system BIOS;
investigates the CPU cache in the early boot stages; and investigates shared
memory on Nvidia GPUs. This investigation found non-random non-fingerprinting
behavior in several components but revealed usable PUFs in Nvidia GPUs.Comment: 25 pages, 6 figures. Code in appendi
Interplay between microdynamics and macrorheology in vesicle suspensions
The microscopic dynamics of objects suspended in a fluid determines the
macroscopic rheology of a suspension. For example, as shown by Danker and
Misbah [Phys. Rev. Lett. {\bf 98}, 088104 (2007)], the viscosity of a dilute
suspension of fluid-filled vesicles is a non-monotonic function of the
viscosity contrast (the ratio between the viscosities of the internal
encapsulated and the external suspending fluids) and exhibits a minimum at the
critical point of the tank-treading-to-tumbling transition. By performing
numerical simulations, we recover this effect and demonstrate that it persists
for a wide range of vesicle parameters such as the concentration, membrane
deformability, or swelling degree. We also explain why other numerical and
experimental studies lead to contradicting results. Furthermore, our
simulations show that this effect even persists in non-dilute and confined
suspensions, but that it becomes less pronounced at higher concentrations and
for more swollen vesicles. For dense suspensions and for spherical (circular in
2D) vesicles, the intrinsic viscosity tends to depend weakly on the viscosity
contrast.Comment: 9 pages, 9 figures, to appear in Soft Matter (2014
Phosphorus Release Characteristics from Biosolids-Derived Organomineral Fertilizers
This study investigated the availability of phosphorus (P) following soil application of a novel biosolids-derived organomineral fertilizer (OMF15; 15:4:4) in comparison with single superphosphate (0:18:0). Two soil types of contrasting characteristics were incubated over a period of 90 days at 25 °C and maintained near field capacity. Phosphorus was applied at rates equivalent to 0 (control), 150, and 300 kg ha−1 of P2O5, respectively. Availability of P from OMF15 was low throughout the experiment accounting for less than 6.5% of total OMF15-P applied. It was shown that after the 90 days incubation period, the overall increase in soil extractable P in OMF15-treated soil was marginal in both soil types. For single superphosphate (SSP), P availability ranged from 16% to 46% of total SSP-P applied. Application of SSP increased soil extractable P levels significantly (P < 0.001) compared with unfertilized control soils. The results of this study aided the development of fertilization strategies for the best use of OMF produced from nutrient-enriched biosolids granules for applications in winter cereal and grass crops in England
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