bluuebunny/crossref_metadata_2025_split huggingface dataset:
Robust sequential adaptive Kalman filter algorithm for ultrashort baseline underwater acoustic positioning
Authors: Yang Fanlin , Zhang Xiaofei , Sui Haichen , Xin Mingzhen , Luo Yu , Shi Bo 
Published: November 2022

Abstract
Affected by dynamic changes in the complex marine environment, ultrashort baseline (USBL) systems may exhibit continuous gross errors in underwater target positioning, resulting in the distortion of the target coordinates. To effectively detect and eliminate continuous gross errors in USBL underwater acoustic positioning, a robust sequential adaptive Kalman filter (RSAKF) algorithm is proposed in this paper. The RSAKF algorithm employs sequential filtering to decompose all measurement updates into multiple submeasurement updates and uses the fading memory weighted average method to estimate the one-step prediction mean square error of the metrics for each submeasurement update. Then, the RSAKF algorithm adopts an adaptive correction method of submeasurement noise variance, which eliminates the influence of continuous gross errors through a more targeted adaptive correction of each submeasurement noise variance. The effectiveness of the algorithm was quantitatively analyzed using a USBL positioning simulation experiment, and the results showed that the continuous gross errors rejection rate of the RSAKF algorithm reached 84.12%. The point error of the RSAKF algorithm is improved by 62.65%, 46.76%, 36.09%, and 26.48% compared with the Kalman filter (KF), KF based on Huber, KF based on Institute of Geodesy and Geophysics, and the maximum correntropy KF, respectively. The USBL positioning remotely operated vehicle experiment was conducted in the South China Sea, and the results showed that the RSAKF has the best filtering accuracy. Simulation and actual measurement experiments verified that the RSAKF algorithm can effectively eliminate the influence of continuous gross errors.
A multi-institutional comparison of acceptance testing data for a 0.35 T MRI scanner
Authors: Khan Ahtesham Ullah , DeWerd Larry A , Das Indra J , Yadav Poonam 
Published: November 2022

Abstract

Objective. To present and quantify the variability in the acceptance testing data for the imaging component of the 0.35 T magnetic resonance-linear accelerator (MR-linac). Approach. The current acceptance testing protocol by the MR-linac vendor was described along with the equipment and scanner parameters utilized throughout the process. The Bo
field homogeneity, SNR/uniformity of the combined and individual receiver coils, American College of Radiology (ACR) image quality testing, and spatial integrity of the imaging data were collected from twelve different institutions. The variability in the results was accentuated and the ramifications of the results were discussed in the context of MR-guided radiation therapy. Main Results. The Bo
field homogeneity was found to have a large gantry dependence with the median values being <4 ppm for all gantry angles. The SNR and uniformity were found to be well above the vendor-specified thresholds with a relatively small institutional-dependence. All institutions passed the ACR image uniformity tests. The largest institutional variability was noted to be for the slice positional accuracy test. The spatial fidelity was calculated to be <1.0 and <2.1 mm within a 100 and a 175 mm radius from the isocenter. Significance. The results from this study can be used to set the tolerances and formal guidelines for MR-linacs imaging quality assurance. Additionally, the multi-institutional data reported in this work will aid in future MR-linac acceptance and commissioning.
An updated review of the new hadron states
Authors: Chen Hua-Xing , Chen Wei , Liu Xiang , Liu Yan-Rui , Zhu Shi-Lin 
Published: November 2022

AbstractThe past decades witnessed the golden era of hadron physics. Many excited open heavy flavor mesons and baryons have been observed since 2017. We shall provide an updated review of the recent experimental and theoretical progresses in this active field. Besides the conventional heavy hadrons, we shall also review the recently observed open heavy flavor tetraquark statesX(2900) andTcc+(3875)as well as the hidden heavy flavor multiquark statesX(6900),Pcs(4459)0,Zcs(3985)−,Zcs(4000)+, andZcs(4220)+. We will also cover the recent progresses on the glueballs and light hybrid mesons, which are the direct manifestations of the non-AbelianSU(3) gauge interaction of the Quantum Chromodynamics in the low-energy region.
High responsivity n-ZnO nanorods/p-GaN heterojunction-based UV-A photodetectors
Authors: Francis Bellarmine , Sebastian Reethu , Dixit Tejendra , Ganapathi K Lakshmi , Rao M S Ramachandra 
Published: November 2022

Abstract
Here, we report the fabrication of ZnO/p-GaN based high responsivity ultraviolet (UV) photodetector. Hydrothermal technique has been followed to grow ZnO nanorods; where two different types of precursors (nitrate and chloride) were used for the growth of nanorods. Interestingly, it was found that the ZnO nanorods grown using nitrate precursor are less prone to defect emission in comparison to the ZnO nanorods prepared using chloride-based precursor which resulted in low dark current levels. The photo-responsivity and photo-detectivity values of the as-fabricated device were calculated to be 350 mA W−1 and 3.5 × 1011 Jones, respectively at 360 nm excitation wavelength and ∼1.79 µW cm−2 excitation intensity. The demonstration of high responsivity UV detectors (at low excitation intensity values) using ZnO nanorods/GaN can pave the way toward the development of high-performance next generation UV photodetectors.
Hölder continuity of Oseledets subspaces for linear cocycles on Banach spaces*
Authors: Luo Chiyi , Zhao Yun 
Published: November 2022

Abstract
Let f : X → X be an invertible Lipschitz transformation on a compact metric space X. Given a Hölder continuous invertible operator cocycles on a Banach space and an f-invariant ergodic measure, this paper establishes the Hölder continuity of Oseledets subspaces over a compact set of arbitrarily large measure. This extends a result in [V Araujo, A I Bufetov and S Filip, On Hölder-continuity of Oseledets subspaces, J. Lond. Math. Soc. 2016, 93 : 194–218]. for invertible operator cocycles on a Banach space. This paper also proves the Hölder continuity in the non-invertible case. Finally, some applications are given in the end of this paper.
Fast computation of non-linear power spectrum in cosmologies with massive neutrinos
Authors: Noriega Hernán E. , Aviles Alejandro , Fromenteau Sebastien , Vargas-Magaña Mariana 
Published: November 2022

Abstract
We compute 1-loop corrections to the redshift space galaxy power spectrum in cosmologies containing additional scales, and hence kernels different from Einstein-de Sitter (EdS). Specifically, our method is tailored for cosmologies in the presence of massive neutrinos and some modified gravity models; in this article we concentrate on the former case. The perturbative kernels have contributions that we notice appear either from the logarithmic growth rate f(k,t), which is scale-dependent because of the neutrino free-streaming, or from the failure of the commonly used approximation f
2 = Ω
m
. The latter contributions make the computation of loop corrections quite slow, precluding full-shape analyses for parameter estimation. However, we identify that the dominant pieces of the kernels come from the growth factor, allowing us to simplify the kernels but retaining the characteristic free-streaming scale introduced by the neutrinos' mass. Moreover, with this simplification one can exploit FFTLog methods to speed up the computations even more. We validate our analytical modeling and numerical method with halo catalogs extracted from the Quijote simulations finding good agreement with the, a priori, known cosmological parameters. We make public our Python code FOLPSν to compute the redshift space power spectrum in a fraction of second. Code available at https://github.com/henoriega/FOLPS-nu.
BAO+BBN revisited — growing the Hubble tension with a 0.7 km/s/Mpc constraint
Authors: Schöneberg Nils , Verde Licia , Gil-Marín Héctor , Brieden Samuel 
Published: November 2022

AbstractThe combination of Baryonic Acoustic Oscillation (BAO) data together with light element abundance measurements from Big Bang Nucleosynthesis (BBN) has been shown to constrain the cosmological expansion history to an unprecedented degree. Using the newest LUNA data and DR16 data from SDSS, the BAO+BBN probe puts tight constraints on the Hubble constant (H0= 67.6 ± 1.0 km/s/Mpc), resulting in a 3.7σtension with the local distance ladder determination from SH0ES in a ΛCDM model. In the updated BAO data the high- and low-redshift subsets are mutually in excellent agreement, and there is no longer a mild internal tension to artificially enhance the constraints. Adding the recently-developed ShapeFit analysis yieldsH0= 68.3 ± 0.7 km/s/Mpc (3.8σtension). For combinations with additional data sets, there is a strong synergy with the sound horizon information of the cosmic microwave background, which leads to one of the tightest constraints to date,H0= 68.30 ± 0.45 km/s/Mpc, in 4.2σtension with SH0ES. The region preferred by this combination is perfectly in agreement with that preferred by ShapeFit. The addition of supernova data also yields a 4.2σtension with SH0ES for Pantheon, and a 3.5σtension for PantheonPLUS. Finally, we show that there is a degree of model-dependence of the BAO+BBN constraints with respect to early-time solutions of the Hubble tension, and the loss of constraining power in extended models depends on whether the model can be additionally constrained from BBN observations.
The dipole of the astrophysical gravitational-wave background
Authors: Valbusa Dall'Armi Lorenzo , Ricciardone Angelo , Bertacca Daniele 
Published: November 2022

Abstract
One of the main pillars of the ΛCDM model is the Cosmological Principle, which
states that our Universe is statistically isotropic and homogeneous on large scales. Here we test
this hypothesis using the Astrophysical Gravitational Wave Background (AGWB) expected to be
measured by the Einstein Telescope-Cosmic Explorer network; in particular we perform a numerical
computation of the AGWB dipole, evaluating the intrinsic contribution due to clustering and the
kinematic effect induced by the observer motion. We apply a component separation technique in the
GW context to disentangle the kinematic dipole, the intrinsic dipole and the shot noise (SN),
based on the observation of the AGWB at different frequencies. We show how this technique can also
be implemented in matched-filtering to minimize the covariance which accounts for both
instrumental noise and SN. Since GW detectors are essentially full-sky, we expect that this
powerful tool can help in testing the isotropy of our Universe in the next future.
S.M.A.S.H.E.D.: Standard Model Axion Seesaw Higgs inflation Extended for Dirac neutrinos
Authors: Berbig Maximilian 
Published: November 2022

AbstractInspired by the S.M.A.S.H. framework we construct a model that addresses the strong CP problem, axion dark matter, inflation and Dirac neutrino masses as well as leptogenesis. The model possesses only two dynamical scales, namely the SM breaking scalevHand the Peccei Quinn (PQ) breaking scalev. We introduce heavy vector-like quarks in the usual KSVZ fashion to implement the PQ mechanism for the strong CP problem. To generate neutrino masses via a dimension six operator scaling asmν∼v3H/v2σwe add heavy triplet and doublet leptons, which are vector-like under the SM but chiral under PQ symmetry. The model is free from the cosmological domain wall problem and predicts an axion to photon coupling which is about an order of magnitude larger than in conventional DFSZ and KSVZ models. Thus our scenario can be probed and potentially excluded by current and next generation axion experiments such as ORGAN or MADMAX. In addition we numerically demonstrate that our construction can generate the observed baryon asymmetry by realizing a version of the Dirac-Leptogenesis scenario. As a consequence of our neutrino mass mechanism we find that the asymmetry in triplet fermion decays can also be significantly enhanced by up to six orders of magnitude when compared to typical Seesaw scenarios without needing to invoke a resonant enhancement. In passing we note that a decaying Dirac fermion with multiple decay modes contains all the necessary ingredients required for the “quasi optimal efficiency”-scenario previously encountered in the context decaying scalar triplets. The impact of the right handed neutrinos and the axion on ΔNeffis estimated and lies within current bounds.
Nonradial oscillation of strange stars in d dimensions
Authors: Arbañil J D V , Lenzi C H , Malheiro M 
Published: November 2022

Abstract
The influence of the dimensions on the f and p
1 pulsation modes from strange quark stars, in the Cowling approximation, are investigated. For that purpose, the d-dimensional nonradial pulsation equations (d > 4) are numerically integrated considering that the Schwarzschild-Tangherlini line element describes the spacetime outside the object. We found that the fluid pulsation modes could become larger than those obtained in four dimensions. In four dimensions, the f pulsation mode is nearly constant, and for high total masses, it increases monotonically and quickly with the total mass. In this mass interval, the f frequencies grow for the spacetime dimensions between 4 and 6 and decay for d larger than 7. Concerning the p
1 pulsation modes, we found that they increase with the spacetime dimension and decline with the increment of the total mass.
Self-avoiding walks and polygons crossing a domain on the square and hexagonal lattices
Authors: Guttmann Anthony J , Jensen Iwan 
Published: November 2022

Abstract
We have analysed the recently extended series for the number of self-avoiding walks (SAWs)

C
L

(
1
)

that cross an L × L square between diagonally opposed corners. The number of such walks is known to grow as

λ
S

L
2

.

We have made more precise the estimate of

λ
S

,

based on additional series coefficients provided by several authors, and refined analysis techniques. We estimate that

λ
S

=
1.744
5498
±
0.000
0012.

We have also studied the subdominant behaviour, and conjecture that

C
L

(
1
)
∼

λ
S

L
2

+
b
L
+
c

⋅

L
g

,

where

b
=
−
0.043
54
±
0.0001
,

c
=
0.5624
±
0.0005
,

and

g
=
0.000
±
0.005.

We implemented a very efficient algorithm for enumerating paths on the square and hexagonal lattices making use of a minimal perfect hash function and in-place memory updating of the arrays for the counts of the number of paths. Using this algorithm we extended and then analysed series for SAWs spanning the square lattice and self-avoiding polygons (SAPs) crossing the square lattice. These are known to also grow as

λ
S

L
2

.

The sub-dominant term λ

b
is found to be the same as for SAWs crossing the square, while the exponent

g
=
1.75
±
0.01

for spanning SAWs and

g
=
−
0.500
±
0.005

for SAPs. We have also studied the analogous problems on the hexagonal lattice, and generated series for a number of geometries. In particular, we study SAWs and SAPs crossing rhomboidal, triangular and square domains on the hexagonal lattice, as well as SAWs spanning a rhombus. We estimate that the analogous growth constant

λ
H

=
1.387
249
51
±
0.000
000
05
,

so an even more precise estimate than found for the square lattice. We also give estimates of the sub-dominant terms.
In the folds of the central limit theorem: Lévy walks, large deviations and higher-order anomalous diffusion
Authors: Giona Massimiliano , Cairoli Andrea , Klages Rainer 
Published: November 2022

Abstract
This article considers the statistical properties of Lévy walks possessing a regular long-term linear scaling of the mean square displacement with time, for which the conditions of the classical central limit theorem apply. Notwithstanding this property, their higher-order moments display anomalous scaling properties, whenever the statistics of the transition times possesses power-law tails. This phenomenon is perfectly consistent with the classical central limit theorem, as it involves the convergence properties towards the normal distribution. This phenomenon is closely related to the property that the higher order moments of normalized sums of N independent random variables possessing finite variance may deviate, for N tending to infinity, to those of the normal distribution. The thermodynamic implications of these results are thoroughly analyzed by motivating the concept of higher-order anomalous diffusion.
An ICT platform based on a multi-objective control systemic approach for reducing energy use in public buildings
Authors: Franco Alessandro 
Published: November 2022

Abstract
Towards a goal of efficiency through energy use reduction, the paper analyses the perspectives of promoting the concept of integrated energy management in public buildings through implementation of technical energy efficiency measures and solutions supported by the implementation of ICT technologies, useful both for optimisation based on a multi-objective control systemic approach and for contributing to changing users’ behaviours and to motivate their support taking advantage of ICT (e.g. personalised data driven applications, gaming and social networking). The use of the platform has been tested in two educational buildings. The perspective of reducing energy consumption up to 15% has been appreciated
Improving efficiency and renewables utilization by hybrid heating plants for industrial buildings
Authors: Noro M , Mancin S , Cerboni F 
Published: November 2022

Abstract
In this paper, a typical industrial building was modelled using a dynamic simulation software in three very different climatic zones in Italy. On the basis of the thermal loads, a hybrid condensing radiant tubes heating system was modelled. The radiant tubes system was coupled to an air heating system with terminals placed in the building fed by two heat sources: one deriving from the condensation of the exhausted of the radiant tubes, and the other by a heat pump with external air heat source. The energy performance of the hybrid heating system was evaluated by optimizing the nominal power of the heat pump, the bivalent temperature in alternative bivalent operation (the system gives priority to the heat pump, which switches off when the outside air temperature drops below the bivalent temperature and the radiant tubes turn on), and the peak power of the photovoltaic system on the roof of the building. This analysis was performed taking into account the variation in heat pump performance with the outside air temperature. The optimal configuration of the hybrid heating system (minimizing the annual amount of total non-renewable primary energy and maximizing the non-renewable primary energy ratio) was then compared to some more traditional heating systems for industrial buildings to evaluate the energy advantages of this innovative solution.
Gasification as possible technological solution for driftwood management in bodies of waters
Authors: Morselli Nicolò , Dalmonte Fabio , Tartarini Paolo 
Published: November 2022

Abstract
This work studies the possibility of the thermochemical conversion, through gasification, of wood waste that accumulates along river bodies. Thanks to the startup SEADS (Sea Defense Solutions), tree branches were collected from the Lamone river (province of Ravenna - IT) in various conservation states. The wood wastes were pre-treated through a chipping process to make them suitable for chemical/physical analyses and subsequent gasification process using the All Power Labs Power Pallet 30 (PP30) commercial micro-gasifier. The elemental analysis show how the wood material undergoes a certain chemical degradation due to weathering, which leads to an HHV of 18.76 MJ/kg, lower than virgin biomass. The gasification process was firstly simulated through a numerical method that gave positive outputs: syngas with a higher heating value of 4.61 MJ/kg and a gasification efficiency of 63.03%. A subsequent gasification test was used to validate the numerical model that was also used to estimate the electrical (18.91%) and thermal (25.21%) efficiency of a cogeneration power plant, powered by the PP30 gasification reactor.
Thermal and visual remote sensing of residential buildings by UAV
Authors: Ottaviani M , Giammichele L , Fioretti F , Ricci R 
Published: November 2022

Abstract
This paper is aimed to define an innovative method to evaluate building envelope thermal performance over the time by infrared thermography. The remote sensing is carried out by infrared camera and digital camera. An Unmanned Aerial Vehicle (UAV) is used for the sake of image acquisition. Firstly, flight and measurement protocols are defined to guarantee a correct detection and a new dimensionless parameter (β) is introduced to compare images taken in different time instants and environmental conditions. Successively, thermal and visible 3D models of the investigated building are analyzed, and a first draft of a 3D β-map is realized.
Replacing batteries with water by an innovative evaporative cooling process for vehicle air conditioning
Authors: Morselli Nicolò , Cossu Michele , Muscio Alberto 
Published: November 2022

Abstract
In plug-in hybrid and battery electric vehicles, the air conditioning system can absorb a significant fraction of the energy stored onboard in the battery pack, thus causing a decrease of the range, or the need of additional battery capacity with its associated mass and cost. An alternative to standard air conditioning systems is provided by evaporative cooling. This was used at the dawn of the automotive industry in the form of direct evaporative cooling, however it did not take hold due to the high relative humidity induced in the vehicle cabin by the supply of almost saturated air, with the consequent risk of condensation and health issues. In recent times, Maisotsenko developed an innovative indirect evaporative cooling system, in which the air introduced in the conditioned compartment is not humidified and it can also be cooled down to dew point rather than to the wet bulb temperature thanks to the system architecture. Water consumption is relatively low, so the same cooling energy provided by a vapor compression system powered by a given mass fraction of the battery pack can be obtained by evaporating a comparable mass of water. The approach is investigated here by theoretical means, in order to explore its potential and identify possible critical issues.