Space-Efficient Subgraph Search over Streaming Graph with Timing Order Constraint

2020 ◽  
pp. 1-1
Author(s):  
Youhuan Li ◽  
Lei Zou ◽  
M. Tamer Ozsu ◽  
Dongyan Zhao
Keyword(s):  
Order Constraint

scholarly journals Carbon burial in deep-sea sediment and implications for oceanic inventories of carbon and alkalinity over the last glacial cycle

2018 ◽  
Vol 14 (11) ◽  
pp. 1819-1850 ◽  
Author(s):  
Olivier Cartapanis ◽  
Eric D. Galbraith ◽  
Daniele Bianchi ◽  
Samuel L. Jaccard
Keyword(s):  
Marine Sediments ◽  
Active Carbon ◽  
Deep Sea ◽  
Dissolved Inorganic Carbon ◽  
Glacial Cycle ◽  
Last Glacial ◽  
Carbon Burial ◽  
Order Constraint ◽  
The Last Glacial ◽  
Carbon Inventory

Abstract. Although it has long been assumed that the glacial–interglacial cycles of atmospheric CO2 occurred due to increased storage of CO2 in the ocean, with no change in the size of the “active” carbon inventory, there are signs that the geological CO2 supply rate to the active pool varied significantly. The resulting changes of the carbon inventory cannot be assessed without constraining the rate of carbon removal from the system, which largely occurs in marine sediments. The oceanic supply of alkalinity is also removed by the burial of calcium carbonate in marine sediments, which plays a major role in air–sea partitioning of the active carbon inventory. Here, we present the first global reconstruction of carbon and alkalinity burial in deep-sea sediments over the last glacial cycle. Although subject to large uncertainties, the reconstruction provides a first-order constraint on the effects of changes in deep-sea burial fluxes on global carbon and alkalinity inventories over the last glacial cycle. The results suggest that reduced burial of carbonate in the Atlantic Ocean was not entirely compensated by the increased burial in the Pacific basin during the last glacial period, which would have caused a gradual buildup of alkalinity in the ocean. We also consider the magnitude of possible changes in the larger but poorly constrained rates of burial on continental shelves, and show that these could have been significantly larger than the deep-sea burial changes. The burial-driven inventory variations are sufficiently large to have significantly altered the δ13C of the ocean–atmosphere carbon and changed the average dissolved inorganic carbon (DIC) and alkalinity concentrations of the ocean by more than 100 µM, confirming that carbon burial fluxes were a dynamic, interactive component of the glacial cycles that significantly modified the size of the active carbon pool. Our results also suggest that geological sources and sinks were significantly unbalanced during the late Holocene, leading to a slow net removal flux on the order of 0.1 PgC yr−1 prior to the rapid input of carbon during the industrial period.

scholarly journals Neutron anomalous magnetic moment in dense magnetized systems

2018 ◽  
Vol 27 (02) ◽  
pp. 1850011
Author(s):  
Zeinab Rezaei
Keyword(s):  
Magnetic Field ◽  
Equation Of State ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Nuclear Potential ◽  
Order Constraint ◽  
The Magnetic Field

In this work, we calculate the neutron anomalous magnetic moment (AMM) supposing that this value can depend on the density and magnetic field of the system. We employ the lowest-order constraint variation (LOCV) method and [Formula: see text] nuclear potential to calculate the medium dependency of the neutron AMM. It is confirmed that the neutron AMM increases by increasing the density, while it decreases as the magnetic field grows. The energy and equation of state for the system have also been investigated.

scholarly journals Effects of Magnetization on Structure Parameters of Neutron Stars

1987 ◽  
Vol 125 ◽  
pp. 451-451
Author(s):  
Q.M. Wang ◽  
S.H. Gao
Keyword(s):  
Magnetic Susceptibility ◽  
Neutron Stars ◽  
Ferromagnetic State ◽  
Neutron Matter ◽  
Variation Method ◽  
Repulsive Core ◽  
Structure Parameters ◽  
Ferromagnetic Transition ◽  
Order Constraint ◽  
Pure Neutron Matter

We took the magnetic susceptibility χ as a criterion in this study and supposed that the system of neutron matter has a ferromagnetic transition as 1/χ 0. The magnetic susceptibility of pure neutron matter at zero temperature was calculated by means of Owen's lowest order constraint variation method. The following results were obtained: if the interaction between neutron and neutron was the Reid soft-core potential, then no transition to ferromagnetic state was found to occur; if the interaction was HJ, IY potentials, the neutron matter would undergo a transition. These results indicate that the existence of ferromagnetic state depends on the form of potentials. If the interaction between particles is attractive, it will not profit the existence of ferromagnetic state, while the interaction between neutrons has a repulsive core, it will profit the existence of ferromagnetic state. We also calculated the equation of state and structure parameters of neutron stars. It showed that the energy of ferromagnetic state is lower than that of nonferromagnetic one and the ferromagnetic state is more stable. In other words, the ferromagnetic state may exist in neutron stars. We can readily find that ferromagnetic state has some influence on structure parameters of neutron stars, the magnitude of this effect depends on the form of potentials and the values of these structure parameters with ferromagnetism are within the allowed range. In this paper, the possibility existing the ferromagnetic state has been dsicussed. By a rough estimate, the magnetic field strength coming from the complete ferromagnetic state is about 1015 Gauss at ρ ∼ 1015 g/cm3. We assume that this is a possible origin of the strong magnetic fields in neutron stars. If there exists a ferromagnetic state in neutron stars, it will have a substantial influence on the gravitaional collapse theory, neutron superfluid and proton superconductivity.

scholarly journals Hybrid star within the framework of a lowest-order constraint variational method

2020 ◽  
Vol 101 (2) ◽  
Author(s):  
S. Khanmohamadi ◽  
H. R. Moshfegh ◽  
S. Atashbar Tehrani
Keyword(s):  
Variational Method ◽  
Hybrid Star ◽  
Order Constraint

Language acquisition research and the language teacher

1981 ◽  
Vol 4 (1) ◽  
pp. 60-69 ◽  
Author(s):  
Barbara J. Gadalla
Keyword(s):  
Language Acquisition ◽  
Developmental Model ◽  
Older Children ◽  
Teaching Sequence ◽  
Empirical Basis ◽  
Age Related ◽  
Order Constraint ◽  
Research Findings ◽  
Classroom Presentation ◽  
Order Of Presentation

Selected language acquisition research findings are examined in light of the language teacher's daily needs. Research results are reported that provide an empirical basis for selecting and grading materials, determining skills to be taught and their order of presentation, deciding on classroom presentation and procedures, and formulating evaluation instruments. Acquisition ordering relationships are shown to have a bearing on teaching sequence; that such a sequence should provide for a number of grammatical, semantic, and length constraints and a skills order constraint. In addition, the research provides support for a developmental model of learning, stressing the need for a variety of approaches and supporting a cognitively-based orientation for older children and adults. Other age-related variables are considered and their pedagogical consequences are reviewed.

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