1,245 research outputs found
K-quantum Nonlinear Jaynes-Cummings Model in Two Trapped Ions
A k-quantum nonlinear Jaynes-Cummings model for two trapped ions interacting
with laser beams resonant to k-th red side-band of center-of-mass mode, far
from Lamb-Dicke regime, has been obtained. The exact analytic solution showed
the existence of quantum collapses and revivals of the occupation of two atoms.Comment: 8 pages, 3 figure
Quantum-State Engineering of Multiple Trapped Ions for Center-of-Mass Mode
We propose a scheme to generate a superposition with arbitrary coefficients
on a line in phase space for the center-of-mass vibrational mode of N ions by
means of isolating all other spectator vibrational modes from the
center-of-mass mode. It can be viewed as the generation of previous methods for
preparing motional states of one ion. For large number of ions, we need only
one cyclic operatin to generate such a superposition of many coherent states.Comment: 14 pages, revte
Regional Differences and Influencing Factors of Psychological Integration of Urban Floating Population in China
Based on the dynamic monitoring survey data of floating population in 2017, this paper analyzes the regional differences and influencing factors of psychological integration of urban floating population in China. The results show that: (1) The psychological integration of floating population is at a high level; (2) there are significant regional differences in the psychological integration of floating population. The psychological integration of Southeast coastal and a few Western cities is lower than the national average level, and the psychological integration of Northeast, Shandong, Sichuan and Chongqing is higher than the national average level; (3) the psychological integration of floating population has spatial agglomeration effect. In addition to Sichuan and Chongqing, hot spots are concentrated in the North and cold spots are concentrated in the Southeast. (4) Factors like owning real estate, employer status and high education level accelerate the psychological integration of floating population; the increase of income is not conducive to psychological integration, which is related to the sense of relative deprivation; participation in the ânew rural cooperative medical systemâ has a restrictive effect on the psychological integration of floating population; The equalization of temporary residence permit/residence permit and basic public services is an important way to realize psychological integration. The rapid development of urban economy is conducive to the psychological integration of floating population. Inter provincial mobility has an inhibitory effect, and the effects of economic development level, family size and local residence time are not significant
Framework to Guide Rail type Adhesive Lifting Scaffolding in the Design and Application of High-rise Residential Buildings
As to combine with specific engineering practice, this paper presents a framework to guide rail type adhesive lifting scaffolding in high-rise residential building design and constructions well as changed the traditional characteristics of steel pipe scaffold by using new standard truss and scaffold board design All the connecting parts are connected by bolt, using electric wrench to install, and implementing the overall tools, systematic design and installation. Engineering practice proved that the frame rail type adhesive lifting scaffold can not only speed up the construction progress, control costs and improve economic efficiency, but also be popularized in similar engineering
On the second-order zero differential spectra of some power functions over finite fields
Boukerrou et al. (IACR Trans. Symmetric Cryptol. 2020(1), 331-362) introduced
the notion of Feistel Boomerang Connectivity Table (FBCT), the Feistel
counterpart of the Boomerang Connectivity Table (BCT), and the Feistel
boomerang uniformity (which is the same as the second-order zero differential
uniformity in even characteristic). FBCT is a crucial table for the analysis of
the resistance of block ciphers to power attacks such as differential and
boomerang attacks. It is worth noting that the coefficients of FBCT are related
to the second-order zero differential spectra of functions. In this paper, by
carrying out certain finer manipulations of solving specific equations over the
finite field , we explicitly determine the second-order zero
differential spectra of some power functions with low differential uniformity,
and show that our considered functions also have low second-order zero
differential uniformity. Our study pushes further former investigations on
second-order zero differential uniformity and Feistel boomerang differential
uniformity for a power function
An \textit{ab initio} study of magnetic structure transitions of FePS under high pressure
Recent experimental work shows that FePS undergoes phase transitions from
() to () at GPa
and then to metallic at GPa, with the magnetic ordering wave
vector turning from to at GPa and to
short-range magnetic order accompanying the insulator-metal transition. By
preserving the magnetic point groups in calculations we report
the following: (1) We successfully reproduce the first magnetic structure
transition at GPa and briefly discuss the influence of the Hubbard U
parameter on this transition. This isostructural transition causes a change of
the Brillouin zone from base-centered monoclinic to primitive monoclinic, and
an indrect band gap to direct band gap transition. (2) There is a rotation of
the Fe-S octahedron about through the axis before the
neighboring layers shift. (3) The shift between neighboring layers is predicted
to occur at GPa and reverses the energy order between and
. (4) A sudden decrease of Fe-S bond length to \AA \ accompanies
the vanishing of magnetic moment in the insulator-metal transition. Our work
shows the importance of symmetries of magnetic structures in pressure-induced
phase transition of magnetic systems
Calcium Biogeochemical Cycle in a Typical Karst Forest: Evidence from Calcium Isotope Compositions
In order to better constrain calcium cycling in natural soil and in soil used for agriculture, we present the δ44/40Ca values measured in rainwater, groundwater, plants, soil, and bedrock samples from a representative karst forest in SW China. The δ44/40Ca values are found to differ by â3.0â° in the karst forest ecosystem. The Ca isotope compositions and Ca contents of groundwater, rainwater, and bedrock suggest that the Ca of groundwater primarily originates from rainwater and bedrock. The δ44/40Ca values of plants are lower than that of soils, indicating the preferential uptake of light Ca isotopes by plants. The distribution of δ44/40Ca values in the soil profiles (increasing with soil depth) suggests that the recycling of crop-litter abundant with lighter Ca isotope has potential effects on soil Ca isotope composition. The soil Mg/Ca content ratio probably reflects the preferential plant uptake of Ca over Mg and the difference in soil maturity. Light Ca isotopes are more abundant in mature soils than nutrient-depleted soils. The relative abundance in the light Ca isotope (40Ca) is in the following order: farmland > burnt grassland > forests > grassland > shrubland. Our results further indicate that biological fractionation in a soilâplant system is a vital factor for Caâgeochemical transformations in soil surface systems
Several new infinite classes of 0-APN power functions over
The investigation of partially APN functions has attracted a lot of research
interest recently. In this paper, we present several new infinite classes of
0-APN power functions over by using the multivariate method
and resultant elimination, and show that these 0-APN power functions are
CCZ-inequivalent to the known ones.Comment: arXiv admin note: text overlap with arXiv:2210.02207,
arXiv:2210.15103 by other author
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