3,546 research outputs found
CityGML in the Integration of BIM and the GIS: Challenges and Opportunities
CityGML (City Geography Markup Language) is the most investigated standard in the integration of building information modeling (BIM) and the geographic information system (GIS), and it is essential for digital twin and smart city applications. The new CityGML 3.0 has been released for a while, but it is still not clear whether its new features bring new challenges or opportunities to this research topic. Therefore, the aim of this study is to understand the state of the art of CityGML in BIM/GIS integration and to investigate the potential influence of CityGML3.0 on BIM/GIS integration. To achieve this aim, this study used a systematic literature review approach. In total, 136 papers from Web of Science (WoS) and Scopus were collected, reviewed, and analyzed. The main findings of this review are as follows: (1) There are several challenging problems in the IFC-to-CityGML conversion, including LoD (Level of Detail) mapping, solid-to-surface conversion, and semantic mapping. (2) The ‘space’ concept and the new LoD concept in CityGML 3.0 can bring new opportunities to LoD mapping and solid-to-surface conversion. (3) The Versioning module and the Dynamizer module can add dynamic semantics to the CityGML. (4) Graph techniques and scan-to-BIM offer new perspectives for facilitating the use of CityG
Orbital-scale nonlinear response of East Asian summer monsoon to its potential driving forces in the late Quaternary
We conducted a statistical study to characterize the nonlinear response of the East Asian summer monsoon (EASM) to its potential forcing factors over the last 260 ka on orbital timescales. We find that both variation in solar insolation and global ice volume were responsible for the nonlinear forcing of orbital-scale monsoonal variations, accounting for similar to 80% of the total variance. Specifically, EASM records with dominated precession variance exhibit a more sensitive response to changes in solar insolation during intervals of enhanced monsoon strength, but are less sensitive during intervals of reduced monsoon strength. In the case of global ice volume with 100-ka variance, this difference is not one of sensitivity but rather a difference in baseline conditions, such as the relative areas of land and sea which affected the land-sea thermal gradient. We therefore suggest that EASM records with dominated precession variance recorded the signal of a shift in the location of the Inter-tropical Convergence Zone, and the associated changes in the incidence of torrential rainfall; while for proxies with dominated 100-ka variance, it recorded changes in the land-sea thermal gradient via its effects on non-torrential precipitation
Metasurface-mediated anisotropic radiative heat transfer between nanoparticles
Metasurfaces, the two-dimensional (2D) counterpart of metamaterials, have
recently attracted a great attention due to their amazing properties such as
negative refraction, hyperbolic dispersion, manipulation of the evanescent
spectrum. In this work, we propose a theory model for the near field radiative
heat transfer (NFRHT) between two nanoparticles in the presence of an
anisotropic metasurface. Specifically, we set the metasurface as an array of
graphene strips (GS) since it is an ideal platform to implement any metasurface
topology, ranging from isotropic to hyperbolic propagation. We show that the
NFRHT between two nanoparticles can not only be significantly amplified when
they are placed in proximity of the GS, but also be regulated over several
orders of magnitude. In this configuration, the anisotropic surface plasmon
polaritons (SPPs) supported by the GS are excited and provide a new channel for
the near-field energy transport. We analyze how the conductance between two
nanoparticles depends on the orientation, the structure parameters and the
chemical potential of the GS, on the particle-surface or the particle-surface
distances by clearly identifying the characteristics of the anisotropic SPPs
such as dispersion relations, propagation length and decay length. Our findings
provide a powerful way to regulate the energy transport in the particle
systems, meanwhile in turn, open up a way to explore the anisotropic optical
properties of the metasurface based on the measured heat transfer properties.Comment: 17 pages, 8figures, Journa
Precipitation variations of Longxi, northeast margin of Tibetan Plateau since AD 960 and their relationship with solar activity
International audienceThe precipitation variations of Longxi area, northeast margin of the Tibetan Plateau since AD 960 are reconstructed from Chinese historical documentary records. These records show that since AD 960, the precipitation of Longxi decreased and reached the lowest level at the end of the 17th and the 18th centuries. After this period, the precipitation gradually increased. The three short wet periods of Longxi in the last millennium were: from the end of the 10th century to the early years of the 11th century, from the end of the 12th century to the early years of the 13th century and during the first half of the 20th century. The precipitation variations coincide well with variations of the Northern Hemisphere temperature and the atmospheric 14C concentration, as well as the averaged 10Be concentration and the reconstructed solar modulation record which show that solar activity may be an important driving force of the precipitation variations of Longxi on multi-decadal to centennial scales during the last millennium. Solar activity controls the motion of the north edge of the Asian summer monsoon by affecting the Asia summer monsoon intensity, the East Asian winter monsoon intensity and the locations of westerlies, thus further dominating precipitation variations of Longxi. Synchronous variations of Longxi precipitation and Northern Hemisphere temperature may also be ascribed to the same control of solar activity
An empirical analysis of stock market integration: Comparison study of Singapore and Malaysia
Autofocusing and trapping performance of circular swallowtail beams on Rayleigh particles
Circular swallowtail beams (CSBs) have garnered significant attention due to
their remarkable autofocusing capabilities, making them highly promising for
applications such as optical trapping. In this study, we conducted a
comprehensive investigation into the autofocusing behavior and trapping forces
of CSBs. Our findings reveal that CSBs exhibit optimal autofocusing performance
when the radius of the main ring is approximately half of the CSB radius.
Moreover, we observed that the focal length of CSBs consistently surpasses that
of circular Airy beams, even under identical initial conditions. Through
experimental observations, we confirmed the autofocusing propagation of CSBs.
Furthermore, we theoretically analyzed the trapping force and stability of CSBs
on Rayleigh particles. Our results unequivocally demonstrate that CSBs possess
excellent trapping capabilities, indicating their immense potential in optical
manipulation and trapping applications.Comment: 8 pages, 4 figure
Strong decays of the as a fully-strange tetraquark state
We study strong decays of the , along with its possible partner
, as two fully-strange tetraquark states of . We
consider seven decay channels: , , , , , , and
. Some of these channels are kinematically possible, and
we calculate their relative branching ratios through the Fierz rearrangement.
Future experimental measurements on these ratios can be useful in determining
the nature of the and . The has been
observed in the , , and channels,
and we propose to further examine it in the channel. Evidences
of the have been observed in the channel, and we
propose to verify whether this structure exists or not in the ,
, , and channels.Comment: 10 pages, 3 figures, 1 table, suggestions and comments are welcom
Cardiac-derived CTRP9 protects against myocardial ischemia/reperfusion injury via calreticulin-dependent inhibition of apoptosis.
Cardiokines play an essential role in maintaining normal cardiac functions and responding to acute myocardial injury. Studies have demonstrated the heart itself is a significant source of C1q/TNF-related protein 9 (CTRP9). However, the biological role of cardiac-derived CTRP9 remains unclear. We hypothesize cardiac-derived CTRP9 responds to acute myocardial ischemia/reperfusion (MI/R) injury as a cardiokine. We explored the role of cardiac-derived CTRP9 in MI/R injury via genetic manipulation and a CTRP9-knockout (CTRP9-KO) animal model. Inhibition of cardiac CTRP9 exacerbated, whereas its overexpression ameliorated, left ventricular dysfunction and myocardial apoptosis. Endothelial CTRP9 expression was unchanged while cardiomyocyte CTRP9 levels decreased after simulated ischemia/`reperfusion (SI/R) in vitro. Cardiomyocyte CTRP9 overexpression inhibited SI/R-induced apoptosis, an effect abrogated by CTRP9 antibody. Mechanistically, cardiac-derived CTRP9 activated anti-apoptotic signaling pathways and inhibited endoplasmic reticulum (ER) stress-related apoptosis in MI/R injury. Notably, CTRP9 interacted with the ER molecular chaperone calreticulin (CRT) located on the cell surface and in the cytoplasm of cardiomyocytes. The CTRP9-CRT interaction activated the protein kinase A-cAMP response element binding protein (PKA-CREB) signaling pathway, blocked by functional neutralization of the autocrine CTRP9. Inhibition of either CRT or PKA blunted cardiac-derived CTRP9\u27s anti-apoptotic actions against MI/R injury. We further confirmed these findings in CTRP9-KO rats. Together, these results demonstrate that autocrine CTRP9 of cardiomyocyte origin protects against MI/R injury via CRT association, activation of the PKA-CREB pathway, ultimately inhibiting cardiomyocyte apoptosis
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