1,692 research outputs found
Remote information concentration and multipartite entanglement in multilevel systems
Remote information concentration (RIC) in -level systems (qudits) is
studied. It is shown that the quantum information initially distributed in
three spatially separated qudits can be remotely and deterministically
concentrated to a single qudit via an entangled channel without performing any
global operations. The entangled channel can be different types of genuine
multipartite pure entangled states which are inequivalent under local
operations and classical communication. The entangled channel can also be a
mixed entangled state, even a bound entangled state which has a similar form to
the Smolin state, but has different features from the Smolin state. A common
feature of all these pure and mixed entangled states is found, i.e., they have
common commuting stabilizers. The differences of qudit-RIC and qubit-RIC
() are also analyzed.Comment: 10 pages, 3 figure
decay in the isobar resonance model
Based on the effective Lagrangian approach, the
decay is studied in an isobar resonance model with the assumption that the
-meson is produced from intermediate nucleon resonances. The
contributions from the , ,
and states are considered. In terms of
the coupling constants and
extracted from the data of the partial decay widths of the s to the
channel, the reaction cross section of the process
and the partial decay widths of the and
processes, respectively, the invariant mass
spectrum and the Dalitz plot for are predicted. It
is shown that there are two types of results. In the type I case, a large peak
structure around 2.09GeV implies that a considerable mount of or
component may exist in the narrow-width state,
but for the wide-width state, it has little
component. In the type II case, a small peak around 2.11GeV may only indicate
the existence of a certain mount of or component in the
narrow-width state, but no information for the wide-width
state. Further BESIII data with high statistics would help
us to distinguish the strange structures of these s
Multiple Model Rao-Blackwellized Particle Filter for Manoeuvring Target Tracking
Particle filters can become quite inefficient when applied to a high-dimensional state space since a prohibitively large number of samples may be required to approximate the underlying density functions with desired accuracy. In this paper, a novel multiple model Rao-Blackwellized particle filter (MMRBPF)-based algorithm has been proposed for manoeuvring target tracking in a cluttered environment. The advantage of the proposed approach is that the Rao-Blackwellization allows the algorithm to be partitioned into target tracking and model selection sub-problems, where the target tracking can be solved by the probabilistic data association filter, and the model selection by sequential importance sampling. The analytical relationship between target state and model is exploited to improve the efficiency and accuracy of the proposed algorithm. Moreover, to reduce the particle-degeneracy problem, the resampling approach is selectively carried out. Finally, experiment results, show that the proposed algorithm, has advantages over the conventional IMM-PDAF algorithm in terms of robust and efficiency.Defence Science Journal, 2009, 59(3), pp.197-204, DOI:http://dx.doi.org/10.14429/dsj.59.151
Influence of bushenhuoxue on primary visual cortex' BDNF damage in rat model of chronic elevated intraocular pressure
AIM: To observe the effect of traditional Chinese medicine(TCM)of bushenhuoxue on primary visual cortex(PVC)brain-derived neurotrophic factor(BDNF)in rat model of chronic elevated intraocular pressure(EIOP), and explore the mechanism of it initially. METHODS: The rat model of chronic EIOP was established by unilaterally cauterizing 3 episcleral veins, then 30 rats were divided into 3 groups randomly: control group, model group, and treatment group. After given drugs or normal saline for 8 weeks, the rats were put to death. The effect of intraocular pressure(IOP), expression of BDNF and ultrastructure of neuron cell in the PVC was observed. RESULTS: Unilaterally cauterizing episcleral veins increased IOP of the rat model obviously, there was significant difference compared with pre-operation(P<0.01). Semi-quantitative pathological analysis on PVC showed that BDNF of total area in the model group was(82438±2597.39)S/μm2,mean optical density was(1155.9±123.14), integrated optical density was(12915±673.28), compared with the control group {total area was(132370±7588.47)S/μm2, mean optical density was(5365±379.65), integrated optical density was(35102±2648.5)}, there were statistical differences(all P<0.05),there was statistical difference in BDNF of total area between model group and treatment group{(108980±9126.77)S/μm2, P<0.05}, significant difference in mean optical density between the model group and treatment group(3220.4±413.67, P<0.05), statistical difference in integrated optical density between the model group and treatment group(23821±3431.68, P<0.05). CONCLUSION: TCM of bushenhuoxue can repair the PVC damage in the rat model of chronic EIOP by enhancing expression of BDNF, improving ultrastructure of neuron cell
JefiGPU: Jefimenko's Equations on GPU
We have implemented a GPU version of the Jefimenko's equations -- JefiGPU.
Given the proper distributions of the source terms (charge density) and
(current density) in the source volume, the algorithm gives the
electromagnetic fields in the observational region (not necessarily overlaps
the vicinity of the sources). To verify the accuracy of the GPU implementation,
we have compared the obtained results with that of the theoretical ones. Our
results show that the deviations of the GPU results from the theoretical ones
are around 5\%. Meanwhile, we have also compared the performance of the GPU
implementation with a CPU version. The simulation results indicate that the GPU
code is significantly faster than the CPU version. Finally, we have studied the
parameter dependence of the execution time and memory consumption on one NVIDIA
Tesla V100 card. Our code can be consistently coupled to RBG (Relativistic
Boltzmann equations on GPUs) and many other GPU-based algorithms in physics.Comment: 21 pages, 8 figures, 4 table
A saúde mental é o fator mais importante que influencia a qualidade de vida de idosos deixados para trás quando as famílias emigram da China rural
OBJECTIVES: to investigate the quality of life and the associated factors on left behind elderly in rural China. METHOD: the research was conducted cluster sampling to select 456 elderly left behind when family members migrated out of rural China to participate in a cross-sectional study by completing a general data questionnaire and Quality of Life questionnaire. RESULTS: 91.5% of the elderly requested psychological counseling and education. For the elderly, scores for mental health (39.56±13.73) were significantly lower compared with Chinese standard data (61.6±13.7) (POBJETIVOS: investigar la calidad de vida y los factores asociados a los adultos mayores que se quedan en las zonas rurales de China. MÉTODO: la investigación se realizó por medio de muestreo por conglomerados para seleccionar 456 adultos mayores que se quedaron cuando los miembros de la familia emigraron de zonas rurales de China, para participar en un estudio de corte transversal, completando un cuestionario de datos generales y cuestionario de calidad de vida. RESULTADOS: el 91.5% de los adultos mayores solicitó asistencia psicológica y educación. Para los adultos mayores, las puntuaciones de salud mental (39.56±13.73) fueron significativamente más bajos en comparación con los datos estándar de China (61.6±13.7) (pOBJETIVOS: investigar a qualidade de vida e fatores associados de idosos deixados para trás na China rural. MÉTODO: foi realizada amostragem por conglomerado para selecionar 456 idosos deixados para trás quando os membros da família emigram da China rural. Este é um estudo transversal com preenchimento de um questionário de dados gerais e de qualidade de vida. RESULTADOS: 91,5% dos idosos convidados solicitaram aconselhamento e educação psicológicos. Para os idosos, os escores de saúde mental (39,56±13,73) foram significativamente menores em comparação aos dados padrões chineses (61,6±13,7) (
Observation of superconductivity in 3D Dirac semimetal Cd3As2 crystal
Lately, the three-dimensional (3D) Dirac semimetal, which possesses 3D linear
dispersion in electronic structure as a bulk analogue of graphene, has
generated widespread interests in both material science and condensed matter
physics. Very recently, crystalline Cd3As2 has been proposed and proved to be
one of 3D Dirac semimetals which can survive in atmosphere. Here, by controlled
point contact (PC) measurement, we observe the exotic superconductivity around
point contact region on the surface of Cd3As2 crystal. The observation of zero
bias conductance peak (ZBCP) and double conductance peaks (DCPs) symmetric to
zero bias further reveal p-wave like unconventional superconductivity in Cd3As2
quantum matter. Considering the topological property of the 3D Dirac semimetal,
our findings may indicate that the Cd3As2 crystal under certain conditions is a
candidate of the topological superconductor, which is predicted to support
Majorana zero modes or gapless Majorana edge/surface modes in the boundary
depending on the dimensionality of the material
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