bluuebunny/crossref_metadata_2025_split huggingface dataset:
The association of pet ownership and sleep quality and sleep disorders in United States adults
Authors: Medlin Kayla , Wisnieski Lauren 
Published: March 2023

Abstract
Prior studies on the association between pet ownership and sleep quality and sleep disorders have varied results. Pet ownership may be beneficial for an owner’s quality of sleep due to the social support that pets provide. Pets offer a sense of security and companionship, which may result in improvements in levels of anxiety, stress, and depression. Alternatively, pets may disrupt their owners’ sleep. Therefore, this cross-sectional study aimed to determine if there is an association between dog and cat ownership and sleep quality and sleep disorders using data from the National Health and Nutrition Examination Survey (NHANES) conducted in 2005–2006. Separate multivariable logistic regression models were built to assess the association between pet ownership and sleep quality outcomes, which included the following: snoring, snorting, sleep disorder diagnoses, trouble sleeping, trouble falling asleep, waking up during the night, waking up too early, feeling unrested, feeling sleepy, not getting enough sleep, needing pills to sleep, leg jerks and cramps, taking longer than 15 minutes to fall asleep, and getting less than 6 hours of sleep on average. Demographics and body mass index (BMI) were adjusted in a series of hierarchical logistic regression analyses. Our results indicated that having a dog was associated with greater odds of having a sleep disorder and having trouble sleeping. Having a cat was associated with greater odds of having leg jerks. While the causal nature of pet ownership on sleep quality and sleep disorders was unable to be established, the results of this study are consistent with previous studies that found that pet ownership has a negative impact on sleep quality. The results of this study can inform randomized controlled trials for patients with poor sleep quality.
Rubber toughened glass fibre reinforced high impact polystyrene
Authors: Alsewailem Fares D. , Al-ameri Abdulrahman M. 
Published: March 2023

This study aimed to investigate the effect of combining reinforcement agents (i.e. glass fibres) and rubber particles (ethylene-propylene grafted maleic anhydride, EP-g-MA) on the properties of high impact polystyrene (HIPS). HIPS was melt blended and compounded with EP-g-MA and glass fibres at a total weight percentage of both constituents ranging from 0 to 10 wt-%. HIPS content was kept fixed in all prepared samples of 90 wt-%. Samples for testing were prepared in accordance with ASTM 265D and ASTM D 1708 for Izod impact strength and tensile strength, respectively. It was shown that the toughness of HIPS could be significantly enhanced by proper combination of EP-g-MA and glass fibres. Composites with EP-g-MA content greater than 7 wt-% and glass fibre content of 3 wt-% had izod impact strength values greater than 99 J m−1 which reflects 11–77% enhancement over those value for neat HIPS and HIPS reinforced with 10 wt-% glass fibres .
Path integral suppression of badly behaved causal sets
Authors: Carlip P , Carlip S , Surya S 
Published: March 2023

Abstract
Causal set theory is a discrete model of spacetime that retains a notion of causal structure. We understand how to construct causal sets that approximate a given spacetime, but most causal sets are not at all manifold-like, and must be dynamically excluded if something like our Universe is to emerge from the theory. Here we show that the most common of these ‘bad’ causal sets, the Kleitman–Rothschild orders, are strongly suppressed in the gravitational path integral, and we provide evidence that a large class of other ‘bad’ causal sets are similarly suppressed. It thus becomes plausible that continuum behavior could emerge naturally from causal set quantum theory.
Attosecond ionization dynamics of modulated, few-cycle XUV pulses
Authors: Ziems Karl Michael , Wollenhaupt Matthias , Gräfe Stefanie , Schubert Alexander 
Published: March 2023

Abstract
Few-cycle, attosecond extreme ultraviolet (XUV) pulses in the strong field regime are becoming experimentally feasible, prompting theoretical investigating of the ionization dynamics induced by such pulses. Here, we provide a systematic study of the atomic ionization dynamics beyond the regime of the slowly varying envelope approximation. We discuss the properties of such XUV pulses and report on temporal and spectral modulations unique to the attosecond nature of the pulse. By employing different levels of theory, namely the numerical solution to the time-dependent Schrödinger equation, perturbation theory and a semi-analytical approach, we investigate the ionization of atoms by modulated, few-cycle XUV pulses and distinguish first and higher order effects. In particular, we study attosecond ionization in different intensity regimes aided by a general wave function splitting algorithm. Our results show that polarization and interference effects in the continuum prominently drive ionization in the few-cycle regime and report on carrier-envelope phase (CEP)- and intensity-dependent asymmetries in the photoelectron spectra. The use of spectrally modulated attosecond pulses allows us to distinguish between temporal effects causing asymmetries and dynamic interference, and spectral effects inducing a redshift of the photoelectron spectrum.
Bi-chromatic driver enabled control of high harmonic generation in atomic targets
Authors: Rajpoot Rambabu , Holkundkar Amol R 
Published: March 2023

Abstract
We investigated the high-order harmonic generation from interacting time-delayed, linearly polarized bi-chromatic laser pulses with the atomic target. The frequency ratio of secondary to primary fields (

ω
2

/

ω
1

), along with the carrier-envelope-phase (CEP) and respective time-delay between the two pulses, are very instrumental in controlling the ionization of the electron and so the quantum dynamics in the continuum. We observed an optimum CEP (φ) and time delay (

t

d

) for a given bi-chromatic frequency ratio, giving maximum cutoff energy. We studied the effect of CEP and time delay for a fixed frequency ratio and observed that the harmonic cutoff could be controlled in an experimentally feasible way. Moreover, the harmonic yield in the energy range 140 eV–240 eV was also calculated, and it was observed that the harmonic yield scales as

∝
−

ϕ

5

/

6

. The attosecond pulses for different CEP were also calculated by superposing the harmonics in the same energy range, and

∼

200

pulses were observed with peak intensity decreasing with CEP, following the variation of respective harmonic yield with CEP.
Modelling of coupled magnetoelastic waves in structure containing thin antiferromagnetic films on an elastic substrate
Authors: Bogdanova T V , Kalyabin D V , Safin A R , Nikitov S A 
Published: March 2023

Abstract
In this work we present a model explaining the properties of magnetoelastic waves propagation in the heterostructure containing an antiferromagnetic layer on a non-magnetic elastic substate. Horizontally polarized shear surface waves (SH-waves) propagating in thin film are Love waves. The dispersion characteristic of magnetoelastic waves in such structure was obtained, and the effect of variation of the thickness of the antiferromagnetic layer and the external magnetic field on the frequency of the magnetoelastic resonance was also studied. It was found that an increase in the magnetic field magnitude leads to the increase in the magnetoelastic resonance frequency, and, on the contrary, with an increase in the thickness of the AFM layer the magnitude of the magnetoelastic resonance frequency decreases. The obtained results can be used to develop devices for generating and processing signals in the GHz and THz frequency ranges.
Dynamics and feedback sensitivity of vertical-cavity surface-emitting lasers with arbitrary optical feedback intensity
Authors: Hao Chenxi , Zheng Wanhua , Liu Anjin 
Published: March 2023

Abstract
Vertical cavity surface emitting lasers (VCSELs) are the key laser sources in the high-performance computers (HPCs) and data centers (DCs). The explosive growth of data traffic in the HPCs and DCs requires increased bandwidths of VCSELs. In this paper, we deduce the Time-Delay (T-D) model considering the multiple round trips of light in VCSELs with an optical feedback cavity to enhance the modulation bandwidth. The T-D model is suitable for the VCSEL with an arbitrary optical feedback intensity. The influences of the round trip time m of light in the optical feedback cavity on the intensity-modulation responses with strong and weak optical feedback are studied. The feedback coefficients considering the multiple round trips of light in the optical feedback cavity and the dispersions of the distributed Bragg reflector are deduced, and are suitable for the arbitrary optical feedback intensity. The feedback coefficients are influenced by the value of m and the optical feedback intensity, and decrease as the value of m under arbitrary optical feedback intensity increases. The feedback coefficients under strong optical feedback are larger than that under weak optical feedback with the same value of m. The theories are useful for the high-speed VCSELs with optical feedback.
New insights into the photocatalytic and magnetic activity of Co-doped BiFeO3 nanoparticles via competing structures
Authors: Nie Yao , Ma Haoen , Wang Zheng , Lan Changyong , Zhang Wei , Chen Leiming , Huang Chuanfu 
Published: March 2023

Abstract
Cobalt was chosen as the doping element for BiFeO3 (BFO), and pure BFO and a series of BiFe1−x
Co
x
O3 (x = 0.03, 0.05, 0.07, 0.09) nanoparticles, correspondingly labeled as nBFCO (n = 3, 5, 7, 9), were successfully prepared and investigated based on the sol-gel method in this paper. The synthesized nanoparticles were characterized by x-ray diffraction, field emission scanning electron microscopy, Brunauer−Emmett−Teller surface area, x-ray photoelectron spectroscopy and ultraviolet-visible light absorption. With the increase in the doping level of cobalt in BFO, a competing structure wandering between rhombohedral and orthorhombic structures was observed in the experiment. For instance, the microstructure characterization clearly indicates coexistence of the rhombohedral and orthorhombic structures in 7BFCO. Meanwhile, the bandgap of BFO was significantly reduced from 2.04 eV to 1.78 eV. The photocatalytic degradation of Rhodamine B of samples in an aqueous solution was investigated under different wavelengths of light. We found that 7BFCO was the optimal proportion for acquiring the photocatalytic and magnetic activity in this work, e.g. the photocatalytic efficiency can reach 98.2%. The underlying physics based on the lattice structure, size effects and energy gap is also discussed.
Electron-phonon coupling in La3In under pressure
Authors: Singh Surinder , Pinsook Udomsilp 
Published: March 2023

Abstract
Conventional superconducting parameters Eliashberg spectral function, phonon DOS, average electron-phonon coupling constant & superconducting transition temperature of La3In were calculated at ambient and applied positive hydrostatic pressure. Ambient pressure electron-phonon coupling constant was found to be 1.43 and superconducting transition temperature was calculated to be 8.7 K which is close to the experimental reported value of 9.5 K. Logarithmic average phonon frequency at ambient pressure was found to be 6.21 × 10−3 eV. Phonon dispersion relations for the ambient and applied positive hydrostatic pressure were calculated to confirm the dynamical stability of La3In under positive pressure. Acoustic modes of vibrations were found to mediate most of the electron-phonon-electron interaction with a very small contribution from optical modes of vibrations. Fermi surface at ambient pressure was also calculated and employed in explaining the large value of the calculated electron-phonon coupling constant. The effect of spin–orbit coupling on electronic, phonon and superconducting properties of La3In was also studied.
Close contact restriction periods for patients who have received iodine-131 therapy for differentiated thyroid cancer
Authors: Forster Jake C , Badger Daniel , Hickson Kevin J 
Published: March 2023

Abstract
Patients treated with radionuclide therapy usually require restrictions on certain activities for a period of time following treatment to optimise protection of the public and ensure the legal dose limit is not exceeded. Software may be used to calculate necessary restriction periods for an individual based on longitudinal dose rate measurements from the time of radiopharmaceutical administration. A spreadsheet program has been used for this purpose in Australian hospitals for the last two decades. However, this spreadsheet has a limitation in that it uses an approximation in the calculation of dose from a contact pattern, which affects the calculated restriction period. A computer program called Dorn was developed that provides the same functionality as the spreadsheet but without this approximation. Proffered radiation safety advice from Dorn and the spreadsheet were compared. Advice from the spreadsheet and Dorn were compared for 55 patients who underwent iodine-131 therapy for differentiated thyroid cancer. The restriction periods for caring for infants, close contact with children and sleeping with a partner were typically about 13 h longer in Dorn than in the spreadsheet, but in some cases were over a week shorter or a month longer. If the Dorn program is used clinically in place of the spreadsheet, some patients will enjoy shorter restriction periods and the therapy provider can be more confident in their compliance with regulatory requirements and best practice. Dorn is freely available from https://doi.org/jg5f.
Contact restriction time after common nuclear medicine therapies: spreadsheet implementation based on conservative retention function and individual measurements
Authors: Broggio D , Célier D , Michel C , Isambert A 
Published: March 2023

Abstract
The increasing use of new radiopharmaceuticals invites us to reconsider some radiation protection issues, such as the contact restriction time that limits public exposure by nuclear medicine patients. Contact restriction time should be patient specific and conservative, and its assessment made easy for clinicians. Here a method is proposed based on conservative estimation of the whole-body retention function and at least one measurement of the patient’s dose rate. Recommended values of the retention function are given for eight therapies: 131I (Graves’ disease, remnant ablation, patient follow-up, meta-iodobenzylguanidine), 177Lu-prostate-specific membrane antigen and 177Lu-DOTATATE therapies, and 90Y and 166Ho microsphere injection of the liver. The patient line source model for scaling dose rate from one distance to another is included in the restriction time calculation. The method is benchmarked against published values and the influence of the dose rate scaling and whole-body retention function illustrated. A spreadsheet is provided, along with the source code, with recommended values for the eight therapies. The recommended values can be changed as well as the dose rate scaling function, and other radiopharmaceuticals can be included in the spreadsheet provided retention functions are defined.
Effects of Reynolds number and solidity ratio on advection dominated mixing in a high-altitude instrument
Authors: Pamarty Abhijit Pranav , Mascarenhas Craig , Anderson James G 
Published: March 2023

Abstract
Due to the role of ClO and BrO in the rate-limiting step of the catalytic cycles enabling ozone loss, measurement of concentrations of these halogen molecules is of critical importance to understanding the loss rate of ozone in the stratosphere. A key advantage of in situ measurements is that these rate-limiting molecules can be observed simultaneously with ozone in the same volume element of the stratosphere, with high spatial and temporal resolution. Historically, these in situ measurements were made using instruments on the NASA ER-2 flight platform for a few hours at a time. However, the development and advancement of a high-altitude long-endurance (HALE) solar aircraft has made it possible to monitor these radicals continuously in the stratosphere. The slower flight speeds of the HALE aircraft will greatly improve molecule detection sensitivity and spatial resolution. To ensure proper mixing and accurate measurements, a quantitative dissection of the flow dynamics within the instrument architecture is required. Of particular importance are the turbulent behavior and the boundary layer growth, both of which affect measurement quality. The geometry of the NO injector used for titration is studied as a function of its solidity and the flight airspeed, to understand its effect on turbulence and boundary layer growth. A 3D Computational Fluid Dynamics simulation of an Eulerian mixture model is used to analyze the advection-dominated mixing inside the instrument. The injector inside the instrument is found to act as a flow-conditioning device, with a lower solidity causing the downstream flow to be increasingly turbulent. Additionally, a quantitative relationship between the Reynolds number of the inlet air and the volume fraction of the flow is demonstrated. Analysis of the boundary layer dependencies demonstrates that the boundary layer does not encroach on the optical sensing area in any of the cases.
A solvable model of a nonlinear extension of quantum mechanics
Authors: Chodos Alan , Cooper Fred 
Published: March 2023

Abstract
We introduce a particular nonlinear generalization of quantum mechanics which has the property that it is exactly solvable in terms of the eigenvalues and eigenfunctions of the Hamiltonian of the usual linear quantum mechanics problem. We hope that this simple example will elucidate some of the issues of interpreting nonlinear generalization of quantum mechanics that have been put forth to resolve questions about quantum measurement theory.
High temperature and strain dual-parameters fiber sensing based on intermodal interference and femtosecond laser fabricated fiber Bragg grating
Authors: Li Shaode , He Wei , Tan Qimeng , Liu Haochong , Li Zhihan , Zhu Lianqing 
Published: March 2023

Abstract
In this paper, the sensor was proposed by combination of grapefruit photonic crystal fiber (GPCF) and femtosecond laser fabricated fiber Bragg grating (FBG) based on Sagnac interferometer. The GPCF was sandwiched between two single-mode fibers (SMFS) to form a SMF-GPCF-SMF structure, which was based on intermodal interference. The FBG with a central wavelength of 1535.32 nm was inscribed through polyimide coating and cladding by the femtosecond laser point-by-point inscribing method. The spectrum drift data of sensing structure were collected and the dual-parameters matrix of temperature-strain was constructed to realize the simultaneous measurement of temperature and strain. The experimental results showed that the linear range of the strain measurement was from 0 με to 2,000 με at different temperature, the wavelength of FBG and GPCF was red drift and blue drift, respectively, the average strain sensitivity at different temperature was 1.25 pm/με and −2.05 pm/με, all the linearity R2 are higher than 0.999, and has the high repeatability. The linear range of temperature measurement was from 20 °C to 450 °C, the wavelength of FBG and GPCF was red drift and blue drift, respectively, the temperature sensitivity of FBG and GPCF was 15.17 pm °C−1 and −8.87 pm °C−1, the linearity was 0.99983 and 0.99989, respectively.
Nonreciprocal Su-Schrieffer-Heeger lattice in the presence of next-nearest-neighboring coupling
Authors: Zhou Wei-Hua , Zhang Chun-Xia 
Published: March 2023

Abstract
We pay attention to the band structure of the nonreciprocal Su-Schrieffer-Heeger (SSH) lattice modified by next-nearest-neighboring (NNN) coupling. It is found that the NNN coupling induces the chiral symmetry by breaking the particle-hole symmetry, leading to the energies of the end modes in the topologically-nontrivial region dependent on the structural parameters. Also, with the increase of NNN coupling, the encounter of the bulk bands modifies the phase transition manner in a new way. The other phenomenon lies in that the localization of the end modes and the non-Hermitian skin effect can be modulated efficiently by the interplay between the NNN and nonreciprocal couplings. Based on these results, one can understand the nontrivial role of NNN coupling in modifying the energy bands and topological properties of the nonreciprocal SSH lattice.
Measurement of hyperfine constants and the isotope shift of rubidium 5P1/2 excited-state using saturated absorption spectroscopy
Authors: Rupasinghe P M , Wee Fiona , Bullock Thomas , Liu Jiaxing 
Published: March 2023

Abstract
The Saturated Absorption Spectroscopy (SAS) was performed to measure the hyperfine constants of rubidium 5P1/2 excited state using an external-cavity diode laser (ECDL) operating at 795 nm. We report our measurements for the magnetic dipole coupling constants 120.79(29) and 407.75(57) for 85
Rb and 87
Rb respectively. Our measurement of the 85
Rb hyperfine constant shows a good agreement with previous results and our measurement of the 87
Rb hyperfine constant resolves the discrepancy of results that exists in the literature.
Quantum noise of diode laser radiation
Authors: Nadezhdinskii A I , Ponurovskii Ya Ya 
Published: March 2023

Abstract
Semiconductors lasers from several manufacturers have been investigated. Rate equations were proposed to describe the dynamics and explain the mechanisms of the appearance of quantum noise in diode lasers. Stationary solutions of the rate equations were obtained. For the lasers under study, the threshold currents and the number of photons at the threshold are obtained. Four mechanisms of the quantum noises appearance were described: Poisson noises of the photons, Poisson noises of the electrons, shot noises of the pump current, and quantum noise of the radiation field. The photon lifetimes for the investigated diode lasers have been determined. The shot noise of the pumping current does not play a significant role. The Poisson noise of photons is responsible for the maximum noise at the generation threshold of a diode laser. The analysis of quantum noises of quantum-cascade diode lasers is carried out.
The First Multiband Photometric Light Curve Solutions of the V Gru Binary System from the Southern Hemisphere
Authors: Tanriver Mehmet , Poro Atila , Bulut Ahmet , Keskin Ahmet , Blackford Mark G. 
Published: March 2023

Abstract
The first multiband photometric solutions of the short-period V Gru eclipsing binary from the southern hemisphere are presented in this study. Light curves of the system were observed through BVI filters at the Congarinni Observatory in Australia for 15 nights. In addition to the new ground-based data, we also used the TESS observations in two sectors. We analyzed the light curves of the system using the PHysics Of Eclipsing BinariEs (PHOEBE) 2.4.7 version code to achieve the best accordance with the photometric observations. The solutions suggest that V Gru is a near-contact binary system with q = 1.302(81) mass ratio, f
1 = 0.010(23), f
2 = −0.0.009(21), and i = 73.45(38). We considered the two hot spots on the hotter and cooler components for the light curve analysis. We extracted the minima times from the light curves based on the Markov Chain Monte Carlo (MCMC) approach. Using our new light curves, TESS, and additional literature minima, we computed the ephemeris of V Gru. The system’s eclipse timing variation trend was determined using the MCMC method. This system is a good and challenging case for future studies.