4,022 research outputs found
Quantum states of a binary mixture of spinor Bose-Einstein condensates
We study the structure of quantum states for a binary mixture of spin-1
atomic Bose-Einstein condensates. In contrast to collision between identical
bosons, the s-wave scattering channel between inter-species does not conform to
a fixed symmetry. The spin-dependent Hamiltonian thus contains non-commuting
terms, making the exact eigenstates more challenging to obtain because they now
depend more generally on both the intra- and inter-species interactions. We
discuss two limiting cases, where the spin-dependent Hamiltonian reduces
respectively to sums of commuting operators. All eigenstates can then be
directly constructed, and they are independent of the detailed interaction
parameters.Comment: 5 pages, no figure
Atomic number fluctuations in a mixture of two spinor condensates
We study particle number fluctuations in the quantum ground states of a
mixture of two spin-1 atomic condensates when the interspecies spin-exchange
coupling interaction is adjusted. The two spin-1 condensates
forming the mixture are respectively ferromagnetic and polar in the absence of
an external magnetic (B-) field. We categorize all possible ground states using
the angular momentum algebra and compute their characteristic atom number
fluctuations, focusing especially on the the AA phase (when ),
where the ground state becomes fragmented and atomic number fluctuations
exhibit drastically different features from a single stand alone spin-1 polar
condensate. Our results are further supported by numerical simulations of the
full quantum many-body system.Comment: 5 pages, 2 figures, in press PR
Proximity and anomalous field-effect characteristics in double-wall carbon nanotubes
Proximity effect on field-effect characteristic (FEC) in double-wall carbon
nanotubes (DWCNTs) is investigated. In a semiconductor-metal (S-M) DWCNT, the
penetration of electron wavefunctions in the metallic shell to the
semiconducting shell turns the original semiconducting tube into a metal with a
non-zero local density of states at the Fermi level. By using a two-band
tight-binding model on a ladder of two legs, it is demonstrated that anomalous
FEC observed in so-called S-M type DWCNTs can be fully understood by the
proximity effect of metallic phases.Comment: 4 pages, 4 figure
A constrained clustering approach to duplicate detection among relational data
This paper proposes an approach to detect duplicates among relational data. Traditional methods for record linkage or duplicate detection work on a set of records which have no explicit relations with each other. These records can be formatted into a single database table for processing. However, there are situations that records from different sources can not be flattened into one table and records within one source have certain (semantic) relations between them. The duplicate detection issue of these relational data records/instances can be dealt with by formatting them into several tables and applying traditional methods to each table. However, as the relations among the original data records are ignored, this approach generates poor or inconsistent results. This paper analyzes the characteristics of relational data and proposes a particular clustering approach to perform duplicate detection. This approach incorporates constraint rules derived from the characteristics of relational data and therefore yields better and more consistent results, which are revealed by our experiments. © Springer-Verlag Berlin Heidelberg 2007
Associated production of the charged Higgs boson and single top quark at the LHC
The left-right twin Higgs(LRTH) model predicts the existence of the charged
Higgs . In this paper, we study the production of the charged Higgs
boson with single top quark via the process at the
Large Hadron Collider(LHC). The numerical results show that the
production cross section can reach the level of in the reasonable
parameter space of the LRTH model. We expect that, as long as it is not too
heavy, the possible signatures of the heavy charged Higgs boson
might be detected via the decay mode at the LHC
experiments.Comment: This paper has been withdrawn by the author(s) due to some mistakes
in this pape
Sampling strategy to develop a primary core collection of apple cultivars based on fruit traits
A total of 435 accessions of apple germplasm collected from the Xincheng National Apple Germplasm Repository and 10 morphological traits of them were used for studying the optimal sampling strategy for primary core collection of apple (Malus domestica Brokh). In order to acquire the appropriate primary core collection,.. different entire sampling ratio and sampling scheme were compared in the study. Six entire sampling ratios were tested and the sampling schemes following stratification into twolevels, including the grouping principle, sampling proportion within group were studied. The results showed that 10% should be the suitable entire sampling ratio for primary core collection of apple. Under 15% entire sampling ratio, the optimal sampling scheme was grouped based on cultivar group combining with genetic diversity based sampling proportion within group proportion. This sampling strategy was used to acquire the primary core collection of 64 accessions from 435 accessions of applecultivars, and the primary core collection could well represent the genetic diversities of the entire variety collection
Reconstruction of lymphatic vessels in the mouse tail after cupping therapy
Background: The aim of the study was to investigate the regulatory mechanism of local lymphatic reconstruction after cupping therapy in a mouse model.
Materials and methods: The lymphatic reconstruction process in the mouse tail after cupping therapy as well as the expression levels of the vascular endothelial identification molecule CD34, prospero homeobox protein 1 (PROX1), and lymphatic vessel endothelial hyaluronan receptor 1 (LYVE-1) were investigated for a duration of 4 days through immunohistochemistry experiments.
Results: On day 1 after cupping therapy, the CD34+ and LYVE-1+ cell densities were significantly increased, and the formed CD34+LYVE-1+ tubular structure started to express PROX1. This was followed by a decrease in both the CD34+ and LYVE-1+ stem cell densities to basal levels on the second day after cupping therapy. Both the CD34+ and LYVE-1+ cell densities subsequently increased again on the third day after cupping therapy. The increase in the LYVE-1+ density was accompanied by tubular structure formation, which is characteristic of lymphangiogenesis. In addition, the colocalisation of CD34+ and LYVE-1+ cells by immunohistochemistry suggests that the CD34+ stem cells differentiated into new lymphatic endothelial cells.
Conclusions: Our findings indicate that the mechanism underlying the therapeutic effect of cupping therapy involves upregulation of vascular and lymphatic endothelial markers (CD34+, LYVE-1+, and CD34+LYVE-1+) in local tissues, which in turn promotes local new lymphatic vessel formation through the expression of PROX1
Establishment of high effective regeneration and propagation system for ornamental crabapple (Malus spp.)
In order to establish efficient regeneration system for ornamental tissue culture, we used Malus spp. ‘Indian Magic as the experimental materials and investigated the effects of disinfection and antibrowning agents, culture mediums and hormones proportion on differentiation, multiplication, callus induction and rooting, and also the effects of culture substrates on growth of transplants in greenhouse. The results showed that, the selection of stem tips without scale as the tissue culture material and the employment of HgCl2 5+3 min two-step method for stem tip disinfection could reduce contamination rate and the addition of 2.0 g/l PVP (polyvinylpyrrolidone) could effectively prevent the browning of culture medium and explants. When the three kinds of culture medium were fixed [Murshige and Skoog (MS) containing 1.0 mg/l 6-BA (6-benzyladenine) plus 0.01 mg/l NAA (anaphthaleneacetic acid), MS containing mg/l 6-BA plus 0.2 mg/l NAA and 1/2 MS containing 0.2 mg/l NAA] on inducing differentiation, multiplication and rooting, the differentiation rate, multiplication coefficient and rooting rate increased to 81.2, 6.13 and 100%, respectively. At the same time, leaves callus induction rate reached 100% on the medium of MS containing 1.5 mg/l 6-BA plus 1.0 mg/l 2,4- D(2,4-dichlorophexoxyace-tic acid) and adventitious shoots were directly regenerated from leaves on MS containing 1 mg/l 6-BA plus 0.1 mg/l NAA. The survival rate of the transplants was up to 95% and seedlings grew well after the transplant to the substrates containing vermiculite and perlite (1:1) in the greenhouse under relative humidity of 80 to 85%, temperature of 25 ± 2°C, light intensity of 1500 to 2000Lx and mist spraying condition. Based on the stated, we determined a technical framework of the leaves callus induction and regeneration for crabapple tissue culture, in which both the types and concentrations of hormones added in the medium played most important roles.Key words: Malus spp., regeneration, callus induction, propagation, hormones
Beyond the relativistic mean-field approximation. III. Collective Hamiltonian in five dimensions
The framework of relativistic energy density functionals is extended to include correlations related to the restoration of broken symmetries and fluctuations of collective variables. A new implementation is developed for the solution of the eigenvalue problem of a five-dimensional collective Hamiltonian for quadrupole vibrational and rotational degrees of freedom, with parameters determined by constrained self-consistent relativistic mean-field calculations for triaxial shapes. The model is tested in a series of illustrative calculations of potential energy surfaces and the resulting collective excitation spectra and transition probabilities of the chain of even-even gadolinium isotopes
Corrosion fatigue mechanisms and evaluation methods of high-strength steel wires: a state-of-the-art review
Corrosion significantly degrades the fatigue performance of high-strength steel wires. This study conducts an extensive review of corrosion fatigue in corroded steel wires based on relevant literature. It outlines corrosion fatigue evolution mechanisms and discusses various test methodologies. Six distinct approaches are employed to assess corrosion fatigue life. A three-stage multiscale corrosion fatigue evolution process involves pitting formation and growth, short crack propagation, and long crack propagation. Advanced fatigue assessment methods like the Theory of Critical Distances (TCD) and the Strain Energy Density (SED) are explored for predicting the corrosion fatigue life for corroded steel wires. A model utilizes an elastoplastic corrosion fatigue damage framework to comprehensively represent the complex interactions. The physics-data-driven method has garnered increasing attention due to its requirement of fewer sample data and good robustness. Moreover, the reliability method underscores its pivotal role in guaranteeing the longevity of suspenders and cables in practical settings
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