2,948 research outputs found
Hybrid Spam Filtering for Mobile Communication
Spam messages are an increasing threat to mobile communication. Several
mitigation techniques have been proposed, including white and black listing,
challenge-response and content-based filtering. However, none are perfect and
it makes sense to use a combination rather than just one. We propose an
anti-spam framework based on the hybrid of content-based filtering and
challenge-response. There is the trade-offs between accuracy of anti-spam
classifiers and the communication overhead. Experimental results show how,
depending on the proportion of spam messages, different filtering %%@
parameters should be set.Comment: 6 pages, 5 figures, 1 tabl
Observation of a strongly ferromagnetic spinor Bose-Einstein condensate
We report the observation of strongly ferromagnetic spinor
Bose-Einstein condensates of Li atoms. The condensates are generated in an
optical dipole trap without using magnetic Feshbach resonances, so that the
condensates have internal spin degrees of freedom. Studying the non-equilibrium
spin dynamics, we have measured the ferromagnetic spin interaction energy and
determined the -wave scattering length difference among total spin
channels to be Bohr radius. This strong
collision-channel dependence leads to a large variation in the condensate size
with different spin composition. We were able to excite a radial monopole mode
after a spin-flip transition between the and
spin states. From the experiments, we estimated the scattering length ratio
, and determined = 7(2) and =
25(5) Bohr radii, respectively. The results indicate the spin-dependent
interaction energy of our system is as large as 46 of the condensate
chemical potential
Emission of Spin-correlated Matter-wave Jets from Spinor Bose-Einstein Condensates
We report the observation of matter-wave jet emission in a strongly
ferromagnetic spinor Bose-Einstein condensate of Li atoms. Directional
atomic beams with and spin states
are generated from state condensates, or vice versa. This
results from collective spin-mixing scattering events, where spontaneously
produced pairs of atoms with opposite momentum facilitates additional
spin-mixing collisions as they pass through the condensates. The matter-wave
jets of different spin states () can be a macroscopic
Einstein-Podolsky-Rosen state with spacelike separation. Its spin-momentum
correlations are studied by using the angular correlation function for each
spin state. Rotating the spin axis, the inter-spin and intra-spin momentum
correlation peaks display a high contrast oscillation, indicating collective
coherence of the atomic ensembles. We provide numerical calculations that
describe the experimental results at a quantitative level and can identify its
entanglement after 100~ms of a long time-of-flight.Comment: 13 pages(6 main text, 7 supplemental material), 12 figure
Heterogeneity of Adenosine Triphosphate-Based Chemotherapy Response Assay in Colorectal Cancer - Secondary Publication
PURPOSE: Adenosine triphosphate-based chemotherapy response assay (ATP-CRA) is a well-documented and validated technology that can individualize chemotherapy for patients with lung, stomach, or breast cancer. This study explored the feasibility of ATP-CRA as a chemosensitivity test in patients with colorectal cancer.
MATERIALS AND METHODS: A total of 118 patients who underwent surgical resection for colorectal adenocarcinoma were analyzed for chemosensitivity to 6 anticancer drugs using ATP-CRA. We calculated the cell death rate (CDR) by measuring intracellular ATP levels of drug-exposed cells and untreated controls.
RESULTS: Interpretable results were available for 85.5% (118/138) of patients. The mean coefficient of variation for triplicate ATP measurements was 9.2%. The highest CDR was observed in irinotecan (34.0%) and the lowest CDR in etoposide (21.0%). Paclitaxel had the broadest range of CDR (0-86.7%) and 5-FU had the narrowest range of CDR (0-56.8%). The overall highest responsiveness was seen most prevalently in irinotecan (24.7%, 23/93 patients). Irinotecan had the greatest responsiveness in patients with well differentiated and moderately differentiated carcinoma.
CONCLUSION: Our study suggests that ATP-CRA could be used to identify patients with colorectal cancer who might benefit from treatment with a specific chemotherapeutic agent.ope
Failure Elongation of Steel Sheets for an Autobody at the High Strain Rate
This paper presents the dynamic failure elongation of conventional mild steels and advanced high strength steel sheets such as TRIP and DP steels. The failure elongation has been obtained from the high speed tensile testing machine with various strain rates ranged from 0.003/s to 200/s. The experimental result demonstrates that the tensile elongation does not simply decrease as the strain rate increases, but it decreases from the quasi-static state to the strain rate of 0.1 or 1/s and increases again up to the strain rate of 100/s. Furthermore, some high strength steels have the tendency that the tensile elongation increases as the strain rate increases. This tendency has varieties depending on the microstructure and forming history of sheet metal. Moreover, the localized strain rate hardening in the necking region induces the increase of elongation. This phenomenon is very important not only in sheet metal forming but also in the crashworthiness evaluation to predict the fracture of sheet metal members
Classifying the universal coarsening dynamics of a quenched ferromagnetic condensate
Scale invariance and self-similarity in physics provide a unified framework
to classify phases of matter and dynamical properties of near-equilibrium
systems. However, extending this framework to far-from-equilibrium quantum
many-body systems and categorizing their dynamics have remained a major
challenge in physics. Here, we report on the first classification of universal
coarsening dynamics in a quenched two-dimensional ferromagnetic spinor Bose
gas. We observe spatiotemporal scaling of spin correlation functions with
distinguishable scaling exponents, and ,
characteristic, respectively, of binary and diffusive fluids. We find the
universality class of the coarsening dynamics are determined by the symmetry of
the order parameters and the annihilation dynamics of the topological defects.
These observations are in excellent agreement with many-body simulations. Our
results represent a paradigmatic example of categorizing far-from-equilibrium
dynamics in quantum many-body systems.Comment: 7 pages, 5 figures, and supplemental material
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