633 research outputs found
Transfer of d-Level quantum states through spin chains by random swapping
We generalize an already proposed protocol for quantum state transfer to spin
chains of arbitrary spin. An arbitrary unknown level state is transferred
through a chain with rather good fidelity by the natural dynamics of the chain.
We compare the performance of this protocol for various values of . A
by-product of our study is a much simpler method for picking up the state at
the destination as compared with the one proposed previously. We also discuss
entanglement distribution through such chains and show that the quality of
entanglement transition increases with the number of levels .Comment: More discussion about the ground state has been added. Accepted in
Physical Review
Mathematical models describing disappearance of Lucerne hay in the rumen using the nylon bag technique
It is essential to study the dynamics of rumen degradation of feeds before their potential use in formulating diets for ruminants. Various mathematical models have been developed to describe this degradation. The non-lagged exponential model (Model I), the lagged exponential model (Model II), the Gompertz model (Model III), and the generalized Mitscherlich model (Model IV) were examined using two alternative software (SAS and MATLAB) to determine their efficacy in accounting for variation in ruminal disappearance of dry matter (DM) and crude protein (CP) of lucerne hay from three cuttings. All models described DM degradability well (R2 >0.98). Only Models I and II converged when fitted to CP degradability data (R2 >0.98). It was concluded that any of these models could be used to describe the degradation of DM, whereas only Models I and II could be used to describe the degradation of CP from three cuttings of Lucerne hay. All the models that were fitted to the DM degradation data performed reasonably well, with only minor differences in goodness of fit. However, these models differed in values of the parameter estimates. Additionally, SAS failed to converge in the analyses of CP with Models III and IV, and MATLAB converged to nonsensical values with Model III. Model I might be recommended because it fitted the data well and required estimates of the fewest parameters
Keywords: alfalfa hay, in situ digestion, model selection, nonlinear regressio
Role of histaminegic and calcium channels in the inhibitory effects of hydroalcoholic extract of matricaria recutita L. on isolated rabbit jejunum
Introduction: Considering the long traditional history of anti-inflammatory and anti-spasmodic effects of Matricria spices on the gastrointestinal system, the present study aimed to investigate the role of calcium channels and Histamine receptors in the inhibitory effects of hydroalcoholic dry extract of German chamomile (Matricaria recutita L.) on the isolated rabbit jejunum. Methods: All experiments were done on the isolated jejunum of New Zealand rabbits (1.8-2.5 kg). Dry extract of aerial parts of M. recutita was obtained by the maceration technique. The study was performed on two groups (n=6 in each group). In the first group, the effects of cumulative concentrations of M. recutita (3×10-3-1×10-2 mg/ml) on normal and K+-induced contractions (50 mM) of isolated jejunum were studied. In the second group, the inhibitory role of M. recutita (3 – 13×10-3 mg/ml) was evaluated in the presence and absence of histamine and cetrizine. In the presence and absence of 10 μM certizine, a histamine H1-antagonist, a concentration-dependent inhibitory effect of M. recutita extract in the range of 3-13×10-3 mg/ml was recorded the rabbit jejunum. Results: Results showed that EC50 of M. recutita in the absence and presence of K+ was 6.3×10-3 and 6.5×10- 3mg/ml, respectively. IC50 values for two concentrations of M. recutita (8×10-3 , 1×10-2 ) to abrogated contractive phase of Histamine was 9.55 × 10-6 and 1.57 × 10-6 μM. Cetrizine (10 μM) abolished inhibitory effects of M. recutita (IC50=3.6×10-3), (p< 0.001). Conclusion: Dry extract of matricaria recutita had inhibitory effects on the contractions of isolated rabbit jejunum. Calcium channels and histamine were involved in these antispasmodic effects
Dynamics of entanglement of bosonic modes on symmetric graphs
We investigate the dynamics of an initially disentangled Gaussian state on a
general finite symmetric graph. As concrete examples we obtain properties of
this dynamics on mean field graphs of arbitrary sizes. In the same way that
chains can be used for transmitting entanglement by their natural dynamics,
these graphs can be used to store entanglement. We also consider two kinds of
regular polyhedron which show interesting features of entanglement sharing.Comment: 14 pages, 11 figures, Accepted for publication in Physics Letters
Probing of nonlinear hybrid optomechanical systems via partial accessibility
Hybrid optomechanical systems are emerging as a fruitful architecture for
quantum technologies. Hence, determining the relevant atom-light and
light-mechanics couplings is an essential task in such systems. The fingerprint
of these couplings is left in the global state of the system during
non-equilibrium dynamics. However, in practice, performing measurements on the
entire system is not feasible, and thus, one has to rely on partial access to
one of the subsystems, namely the atom, the light, or the mechanics. Here, we
perform a comprehensive analysis to determine the optimal subsystem for probing
the couplings. We find that if the light-mechanics coupling is known or
irrelevant, depending on the range of the qubit-light coupling, then the
optimal subsystem can be either light or the qubit. In other scenarios, e.g.,
simultaneous estimation of the couplings, the light is usually the optimal
subsystem. This can be explained as light is the mediator between the other two
subsystems. Finally, we show that the widely used homodyne detection can
extract a fair fraction of the information about the couplings from the light
degrees of freedom.Comment: 10 pages, 2 appendices, 9 figures. Feedback is welcom
Quantum metrology with boundary time crystals
Quantum sensing is one of the arenas that exemplifies the superiority of
quantum technologies over their classical counterparts. Such superiority,
however, can be diminished due to unavoidable noise and decoherence of the
probe. Thus, metrological strategies to fight against or profit from
decoherence are highly desirable. This is the case of certain types of
decoherence-driven many-body systems supporting dissipative phase transitions,
which might be helpful for sensing. Boundary time crystals are exotic
dissipative phases of matter in which the time-translational symmetry is
broken, and long-lasting oscillations emerge in open quantum systems at the
thermodynamic limit. We show that the transition from a symmetry unbroken into
a boundary time crystal phase, described by a second-order transition, reveals
quantum-enhanced sensitivity quantified through quantum Fisher information. We
also determine the critical exponents of the system and establish their
relationship. Our scheme is indeed a demonstration of harnessing decoherence
for achieving quantum-enhanced sensitivity. From a practical perspective, it
has the advantage of being independent of initialization and can be captured by
a simple measurement.Comment: 7 pages main text, 5 figure
Entanglement Transfer via XXZ Heisenberg chain with DM Interaction
The role of spin-orbit interaction, arises from the Dzyaloshinski-Moriya
anisotropic antisymmetric interaction, on the entanglement transfer via an
antiferromagnetic XXZ Heisenberg chain is investigated. From symmetrical point
of view, the XXZ Hamiltonian with Dzyaloshinski-Moriya interaction can be
replaced by a modified XXZ Hamiltonian which is defined by a new exchange
coupling constant and rotated Pauli operators. The modified coupling constant
and the angle of rotations are depend on the strength of Dzyaloshinski-Moriya
interaction. In this paper we study the dynamical behavior of the entanglement
propagation through a system which is consist of a pair of maximally entangled
spins coupled to one end of the chain. The calculations are performed for the
ground state and the thermal state of the chain, separately. In both cases the
presence of this anisotropic interaction make our channel more efficient, such
that the speed of transmission and the amount of the entanglement are improved
as this interaction is switched on. We show that for large values of the
strength of this interaction a large family of XXZ chains becomes efficient
quantum channels, for whole values of an isotropy parameter in the region .Comment: 21 pages, 9 figure
Dupuytren's: a systems biology disease
Dupuytren's disease (DD) is an ill-defined fibroproliferative disorder of the palm of the hands leading to digital contracture. DD commonly occurs in individuals of northern European extraction. Cellular components and processes associated with DD pathogenesis include altered gene and protein expression of cytokines, growth factors, adhesion molecules, and extracellular matrix components. Histology has shown increased but varying levels of particular types of collagen, myofibroblasts and myoglobin proteins in DD tissue. Free radicals and localised ischaemia have been suggested to trigger the proliferation of DD tissue. Although the existing available biological information on DD may contain potentially valuable (though largely uninterpreted) information, the precise aetiology of DD remains unknown. Systems biology combines mechanistic modelling with quantitative experimentation in studies of networks and better understanding of the interaction of multiple components in disease processes. Adopting systems biology may be the ideal approach for future research in order to improve understanding of complex diseases of multifactorial origin. In this review, we propose that DD is a disease of several networks rather than of a single gene, and show that this accounts for the experimental observations obtained to date from a variety of sources. We outline how DD may be investigated more effectively by employing a systems biology approach that considers the disease network as a whole rather than focusing on any specific single molecule
Productivity, quality and economics of four spring wheat (Triticum aestivum L.) cultivars as affected by three cultivation technologies
ArticleManaging farming inputs in wheat production technologies is an issue of paramount importance to attain optimum profitable production. To examine how varying the farming inputs affects the nutrients uptake and productivity of spring wheat (Triticum aestivum L.) cultivars and to determine the economic efficiency of various cultivation technologies, three-year field experiments were laid out at the Russian Research Institute of Agriculture, during the 2015–2017 growing seasons. Experiments were conducted once a year using randomized complete block arranged in a split plot experimental design with three replications, with the cultivation technology treatments (basic, intensive and high intensive technology) as the main plots, and spring wheat cultivars (Zelata, Lubova, Liza and Ester) as the sub-main plots. The highest grain yield (10.8 t ha-1), harvest index (42.9%), gluten content (39.45%) and gluten index (71.17%) observed for spring wheat cultivar Lubova with the moderate application of farming inputs as an intensive cultivation technology. Highest protein content (18.02%) was attained for both intensive and high intensive cultivation technology with the cultivar Lubova, and the highest 1,000 grains weight (46.32 g) was recorded by cultivar Lubova in basic cultivation technology. Applying moderate amount of inputs as an intensive cultivation technology resulted in highest wheat yield and net income
Productivity of various barley (Hordeum vulgare L.) cultivars under semi-arid conditions in southern Russia
ArticleDrought is a significant factor limiting crop production in arid conditions. In the dry
climatic weather situation of
southern Russia, ten
-
year laboratory trials and subsequent field
experiments were laid out on various barley varieties collected across the globe during 2007
–
2017 period. This study was conducted to ascertain from the collection of barley cultivars of the
entire world which one is best suited to stressful climatic conditions by being tolerant to drought,
heat and salinity which can be adopted for barley breeding. According to the results obtained, the
varieties that are tolerant to dry climatic conditions
are as follows: Alga (Lithuania), Brenda,
Henni (Germany), Décor (Great Britain),
Furat
5 (Syria), Vakula (Ukraine), Ataman (Belarus)
and Vladimir (Russia); heat resistant varieties are: Brenda (Germany), Alga (Lithuania),
Furat
5
(Syria), Ataman (Belarus)
, Vladimir and Ratnik (Russia); Salt
-
resistant varieties: Alga
(Lithuania), Henni (Germany) and Vladimir (Russia). The selected varieties did not show any
sign of adverse weather effect resulting in stable grain productivity throughout the entire duration
of this research over the years, they had large grain size and stable 1
,
000 grains weight. However,
the yield of selected cultivars varied over the years which was about 1.1
–
1.4
t
ha
-
1
- …