bluuebunny/crossref_metadata_2025_split huggingface dataset:
Narrow belt of debris around the Sco-Cen star HD 141011
Authors: Bonnefoy M. , Milli J. , Menard F. , Delorme P. , Chomez A. , Bonavita M. , Lagrange A.-M. , Vigan A. , Augereau J. C. , Beuzit J. L. , Biller B. , Boccaletti A. , Chauvin G. , Desidera S. , Faramaz V. , Galicher R. , Gratton R. , Hinkley S. , Lazzoni C. , Matthews E. , Mesa D. , Mordasini C. , Mouillet D. , Olofsson J. , Pinte C. 
Published: November 2021

Context. We initiated a deep-imaging survey of Scorpius-Centaurus A-F stars in 2015. These stars are predicted to host warm inner and cold outer belts of debris reminiscent of the architecture of emblematic systems such as HR 8799.
Aims. We present resolved images of a ring of debris around the F5-type star HD 141011 that was observed as part of our survey. We aim to set constraints on the properties of the disk, compare them to those of other resolved debris disks in Sco-Cen, and detect companions.
Methods. We obtained high-contrast coronagraphic observations of HD 141011 in 2015, 2016, and 2019 with VLT/SPHERE. We removed the stellar halo using angular differential imaging. We searched for scattered light emission from a disk in the residuals and applied a forward-modeling approach to retrieve its morphological and photometric properties. We combined our radial velocity and imaging data to derive detection probabilities for companions co-planar with the disk orientation.
Results. We resolve a narrow ring of debris that extends up to ~1.1″ (~141 au) from the star in the IRDIS and IFS data obtained in 2016 and 2019. The disk is not detected in the 2015 data which are of poorer quality. The disks is best reproduced by models of a noneccentric ring centered on the star with an inclination of 69.1 ± 0.9°, a position angle of −24.6 ± 1.7°, and a semimajor axis of 127.5 ± 3.8 au. The combination of radial velocity and imaging data excludes brown-dwarf (M > 13.6MJup) companions coplanar with the disk from 0.1 to 0.9 au and from 20 au up to 500 au (90% probability).
Conclusions. HD 141011 adds to the growing list of debris disks that are resolved in Sco-Cen. It is one of the faintest disks that are resolved from the ground and has a radial extent and fractional width (~12.5%) reminiscent of Fomalhaut. Its moderate inclination and large semimajor axis make it a good target for the James Webb Space Telescope and should allow a deeper search for putative companions shaping the dust distribution.
The middle-income trap in Central and Eastern Europe in the 2010s: institutions and divergent growth models
Authors: Győrffy Dóra 
Published: November 2021

AbstractThe paper evaluates the convergence paths of Central and Eastern European member states of the EU during the 2010s, when the main task for these countries was avoiding the middle-income trap—when wages are not so low anymore to compete with less developed countries, while innovation is not developed enough yet to compete with developed countries. Using various statistical indicators, the paper shows that while most countries in the region have been on a convergence path during the decade under analysis, not all succeeded in avoiding the trap. While some countries successfully implemented policies to step on the path of productivity- and innovation-led growth (Czechia, Slovenia, Estonia, and Lithuania), in several other states, growth was supported mainly by low costs and loose monetary conditions including significant transfers from the EU. The comparative analysis of Estonia and Hungary illustrates the different growth models and shows how the institutional system plays a key role in exiting the trap.
Doctor–patient relationships are a perceived barrier to chiropractic use by non-Hispanic Black Americans
Authors: Wates Rebecca J. , Wilson Jon , Pfefer Mark T. 
Published: November 2021

AbstractDespite decades of targeted effort, the disparity in access to and utilization of health care remains high in minority populations. Not excluded is the field of chiropractic, where there is an ongoing effort to increase both non-Hispanic black (NHB) practitioners and patients in the United States. In this study, we sought to identify which barriers prevent NHB access to chiropractic care. We utilized Qualtrics© (Qualtrics, Provo, UT) and MTurk© (Amazon Mechanical Turk, Inc.) to administer an online survey to 3814 U.S. respondents. Among non-Hispanic blacks, and compared with whites, participants were more likely to consider chiropractic care if the doctor shares their racial identity (37.6% vs. 17.1%) or if referred by a family member or friend (83.1% vs. 72.2%). NHB respondents were more likely to report barriers such as communication, transportation, or not being understood by their care provider compared with their white counterparts. Interestingly, there were no significant differences between NHB and white respondents on cost-related barriers (e.g., too expensive, insurance does not cover chiropractic). These findings highlight a need for increasing the number of practicing NHB chiropractors, through improved minority recruitment to chiropractic colleges. Further, chiropractor-driven community outreach may also begin to address the disparities in access to care for the non-Hispanic black population.
Novel two-dimensional beta-XTe (X = Ge, Sn, Pb) as promising room-temperature thermoelectrics
Authors: Ni Yuxiang , Zhang Dingbo , Liu Xin , Wang Hui , Chen Yuanzheng , Xia Yudong , Wang Hongyan 
Published: November 2021

In this paper, we designed novel low-symmetry two-dimensional (2D) structures based on conventional XTe (X = Ge, Sn, Pb) thermoelectrics with large average atomic mass. The first-principles calculations combined with Boltzmann transport theory show that the beta-XTe exhibit good stability, high electron carrier mobility, and ultralow ΚL. The subsequent analyses show that the ultralow ΚL stems from the coexistence of resonant bonding, weak bonding, and lone-pair electrons in beta-XTe, which leads to large anharmonicities. On the other hand, the lowest energy conduction band of beta-GeTe and beta-SnTe show the convergence of the low-lying Ʃ band, which is the source of the high-power factor in the two systems. The calculated maximum ZT of beta-XTe (X = Ge, Sn, Pb) are 3.08, 1.60, and 0.57 at 300 K, respectively, which is significantly greater than that of the previously reported high-symmetry 2D alpha-XTe and the commercial thermoelectrics. We hope that this work can provide important guidance for the development of thermoelectric materials.
Increased footwear comfort is associated with improved running economy – a systematic review and meta‐analysis
Authors: Van Alsenoy K. , van der Linden M. L. , Girard O. , Santos D. 
Published: November 2021

ABSTRACTFootwear with or without custom foot orthotics have the potential to improve comfort, but the link with running performance needs further investigation. We systematically reviewed the association of footwear comfort on running economy in recreational runners. Nine electronic databases were searched from inception to March 2020. Eligible studies investigated both direct outcome measures of running performance (e.g. running speed) and/or physiological measures (e.g. running economy (RE)) alongside comfort for each footwear condition tested. Methodological quality was assessed using the “Effective Public Health Practice Project” (EPHPP). RE during submaximal running was the most common physiological outcome reported in 4 of the 6 eligible studies. The absolute difference in RE between the most and least comfortable footwear condition was computed, and meta‐analysis was conducted using a random effect model. The most comfortable footwear is associated with a reduction in oxygen consumption (MD: −2.06 mL.kg−1.min−1, 95%CI: −3.71, −0.42, P = 0.01) while running at a set submaximal speed. There was no significant heterogeneity (I 2 = 0%, P = 0.82). EPHPP quality assessment demonstrated weak quality of the studies, due to reporting bias and failing to disclose the psychometric properties of the outcome measures. It can be concluded with moderate certainty that improved RE in recreational athletes is associated with wearing more comfortable footwear compared to less comfortable footwear.Highlights

This systematic review reports on the association of footwear comfort with running economy in recreational runners.
Running economy during constant submaximal running is likely improved in recreational runners wearing more comfortable compared to less comfortable footwear.
This finding is based on a meta‐analysis, including four studies, showing a small but statistically significant decreased oxygen consumption at steady state speeds while wearing the most comfortable footwear.
Fluid control with hydrophobic pillars in paper-based microfluidics
Authors: Liu Jingji , Zhang Boyang , Zhang Yajun , Fan Yiqiang 
Published: November 2021

Abstract
Paper-based microfluidics has been widely used in chemical and medical analysis applications. In the conventional paper-based microfluidic approach, fluid is propagating inside the porous structure, and the flow direction of the fluid propagation is usually controlled with the pre-defined hydrophobic barrier (e.g. wax). However, the fluid propagation velocity inside the paper-based microfluidic devices largely depends on the material properties of paper and fluid, the relative control method is rarely reported. In this study, a fluid propagation velocity control method is proposed for paper-based microfluidics: hydrophobic pillar arrays with different configurations were deposited in the microchannels in paper-based microfluidics for flow speed control, the result indicates the deposited hydrophobic pillar arrays can effectively slow down the fluid propagation at different levels and can be used to passively control the fluid propagation inside microchannels for paper-based microfluidics. For the demonstration of the proposed fluid control methods, a paper-based microfluidic device for nitrite test in water was also fabricated. The proposed fluid control method for paper-based microfluidics may have significant importance for applications that involve sequenced reactions and more actuate fluid manipulation.
In situ/operando investigation of catalytic and electrocatalytic interfaces
Authors: Favaro Marco , Artiglia Luca , Mun Bongjin Simon 
Published: November 2021

Abstract

In situ and operando spectroscopic methods play a fundamental role in a variety of different fields of modern science. In particular, as energy and environmental science have become increasingly important recently, the need of in situ and operando spectroscopic methods has also increased significantly. Therefore, we felt it was time to have a special issue focused on such techniques and for which the aim is ‘to merge the research communities investigating catalytic and (photo)electrochemical interfaces with different in situ/operando spectroscopic techniques, to share recent results, experimental methods, and future perspectives’, as we reported in the scope of this special issue. With its 23 original research papers and 2 topical reviews, spanning from heterogeneous catalysis to photoelectrochemistry, we believe that the outcome of this special issue fulfills the aforementioned aim.
The transverse electric plasmonic modes in a negative refractive index black phosphorene waveguide structure
Authors: Yang C H , Zhang J Y , Wieser R , Xu W 
Published: November 2021

Abstract
We consider the transverse electric (TE) plasmonic modes supported by black phosphorene (BP) in a parallel waveguide structure with left-handed material (LHM) instead of the conventional right-handed dielectric material. The existence condition of the TE BP surface plasmon polariton (SPP) is

I
m

σ
>
0

. When an electric field is polarized along one of the two orthogonal crystal axes, the anisotropic symmetric and anti-symmetric plasmonic modes depend on the incident optical energy, the chemical potential, and the distance between two BP sheets can be observed. The symmetric mode has a more extensive effective refractive index, which possesses stronger field confinement. With a decreasing distance d between two BP sheets, the coupling strength between the two separate BPSPP waves increases. When d is small enough, the anti-symmetric mode root does not exist. LHMs can be used to realize a TE BPSPP mode to enhance the localization of the BPSPP, which is a practical method in optoelectronic devices based on black phosphorene.
Bending strain in 3D topological semi-metals
Authors: Diaz Jonas , Putzke Carsten , Huang Xiangwei , Estry Amelia , Analytis James G , Sabsovich Daniel , Grushin Adolfo G , Ilan Roni , Moll Philip J W 
Published: November 2021

Abstract
We present an experimental set-up for the controlled application of strain gradients by mechanical piezoactuation on 3D crystalline microcantilevers that were fabricated by focused ion beam machining. A simple sample design tailored for transport characterization under strain at cryogenic temperatures is proposed. The topological semi-metal Cd3As2 serves as a test bed for the method, and we report extreme strain gradients of up to

1.3
%

μ

m−1 at a surface strain value of

≈

0.65
%

at 4 K. Interestingly, the unchanged quantum transport of the cantilever suggests that the bending cycle does not induce defects via plastic deformation. This approach is a first step towards realizing transport phenomena based on structural gradients, such as artificial gauge fields in topological materials.
Compact balanced diplexer based on hairpin split ring resonators with high isolation performance
Authors: Kuang Jiaxin , Liu Haiwen , Feng Linping , Tian Hongliang 
Published: November 2021

Abstract
In this paper, a compact balanced diplexer using a novel hairpin split ring resonator (H-SRR) is presented and demonstrated. First, the working principle of the proposed H-SRR is described, which shows a negative permittivity or a negative permeability in the stopband. It can be used to construct compact passive components and improve the stopband rejection performance. Then, the differential-mode (DM) excitation and common-mode (CM) excitation are investigated, respectively. Under DM operation, the H-SRR can provide one DM resonant mode. Under CM operation, the H-SRR can excite two CM resonant modes far from the DM resonant mode, thus producing a desired CM rejection performance. Moreover, by introducing a mixed electromagnetic coupling, transmission zeros are produced, significantly improving the DM isolation between the two channels. Finally, a balanced diplexer is designed and fabricated. The lower and higher channels of the diplexer are centered at 3.36 and 4.00 GHz. The DM channel isolation is better than 40/41 dB in the two passbands when the frequency ratio is less than 1.2, which is in satisfactory agreement with the simulated results.
In-situ measurement of dust charge density in nanodusty plasma
Authors: Staps Tim Jacobus Adrianus , Maria Donders Tim Jacobus , Platier Bart , Beckers Job 
Published: November 2021

Abstract
A dust grain immersed in a low-pressure gas discharge obtains a permanent negative surface charge due to the high mobility of electrons compared to that of ions. This charge essentially governs all fundamental processes in dusty and complex plasmas involving dust grains, neutrals, (an)ions and electrons and—consequently—virtually all industrial applications of these types of plasmas are affected and steered by it. In this work, we have measured the surface charge by application of laser-induced electron detachment from nanosized dust grains in concert with microwave cavity resonance spectroscopy and laser light extinction. The main result is that the electron release is governed by photodetachment rather than by thermionic emission, and that recharging of the dust grains occurs on timescales that are well in agreement with the orbital-motion-limited (OML) theory. The total surface charge density residing on the dust grains inside the laser volume follows from the saturation of the photodetachment signal, which was used in combination with dust density values derived from extinction measurements to estimate the mean dust charge. The negative dust charge on the 140 nm (average) diameter dust grains in this work is obtained to be in the range of 273 – 2519 elementary charges, of which the lower bound matches well with analytical predictions using the OML theory.
Mechanism, theory and application research of a rotating electromagnetic energy harvester suitable for multi-directional excitation
Authors: Guo Shengkai , Gao Shiqiao , Jin Lei , Du Xueda , Yin Zuozong , Wu Qinghe , Li Zezhang 
Published: November 2021

Abstract
Energy harvesting in multi-directional excitation for human wearable devices is a challenge. A rotating electromagnetic energy harvester (REMEH) based on an eccentric rotor structure is proposed in this paper. Two poles of the magnets in the REMEH are alternately arranged in a ring. The electrical output characteristics of the energy harvester are analyzed through theoretical, numerical simulation and experimental testing methods based on the establishment of magnetic flux density models, the coil induced voltage, and the excitation direction of the eccentric rotor structure. Theoretical analysis and experimental results show that the design of the eccentric rotor structure is well adapted to multi-directional and irregular excitation. The circular staggered arrangement of the magnets effectively increases the output voltage and output power. The results show that the average output power increases slowly when the walking speed increases from 1 to 3 km h−1, and the average output power increases substantially when the walking speed increases from 3 to 5 km h−1. When the walking speed is 1 and 3 km h−1, the average output power is 0.439 and 0.638 mW, respectively. At a walking speed of 5 km h−1, the average output power increases rapidly to 1.68 mW, corresponding to a power density of 16.59 μW g−1. This high-performance energy harvester can provide effective power supply for wearable devices or low-powered sensors.
The effect of substitutional doping of Yb2+ on structural, electronic, and optical properties of CsCaX
3 (X: Cl, Br, I) phosphors: a first-principles study
Authors: Khan Rashid , Ur Rahman Kaleem , Zhang Qingmin , Rahman Altaf Ur , Azam Sikander , Dahshan Alaa 
Published: November 2021

Abstract
Using first-principles calculations, the effects of Yb2+ substitutional doping on structural, electronic, and optical properties of a series of perovskite compounds CsCaX
3 (X: Cl, Br, I), have been investigated. We employed generalized gradient approximation (GGA) and HSE hybrid functional to study the electronic and optical properties. A series of pristine CsCaX
3 (X: Cl, Br, I) is characterized as a non-magnetic insulator with indirect bandgap perovskite materials. These phosphor materials are suitable candidates for doping with lanthanide series elements to tune their electronic bandgaps according to our requirements because of their wide bandgaps. The calculated electronic bandgaps of CsCaX
3 (X: Cl, Br, I) are 3.7 eV (GGA) and 4.5 eV (HSE) for CsCaI3, 4.5 eV (GGA) and 5.3 eV (HSE) for CsCaBr3, and 5.4 eV (GGA) and 6.4 eV (HSE) for CsCaCl3. According to formation energies, the Yb2+ doped at the Ca-site is thermodynamically more stable as compared to all possible atomic sites. The electronic band structures show that the Yb2+ doping induces defective states within the bandgaps of pristine CsCaX
3 (X: Cl, Br, I). As a result, the Yb2+ doped CsCaX
3 (X: Cl, Br, I) become the direct bandgap semiconductors. The defective states above the valence band maximum are produced due to the f-orbital of the Yb atom. The impurity states near the conduction band minimum are induced due to the major contribution of d-orbital of the Yb atom and the minor contribution of s-orbital of the Cs atom. The real and imaginary parts of the dielectric function, optical reflectivity, electron energy loss spectrum, extinction coefficient, and refractive index of pristine and Yb2+ doped CsCaX
3 (X: Cl, Br, I) were studied. The optical dispersion results of dielectric susceptibility closely match their relevant electronic structure and align with previously reported theoretical and experimental data. We conclude that the Yb2+ doped CsCaX
3 (X: Cl, Br, I) are appealing candidates for optoelectronic devices.
Quince seed mucilage coated iron oxide nanoparticles for plasmid DNA delivery
Authors: Nikforouz Bahar , Allafchian Alireza , Jalali Seyed Amir Hossein , Shakeripour Hamideh , Mohammadinezhad Rezvan 
Published: November 2021

Abstract
This study investigates the potential of iron oxide nanoparticles (Fe3O4) and quince seed mucilage as combined genetic carriers to deliver plasmid DNA (pDNA) through the gastrointestinal system. The samples are characterized by x-ray diffraction (XRD), zeta potential, dynamic light scattering, FT-IR spectroscopy, field emission scanning electron microscopy and vibrating sample magnetometry. The stability of pDNA loading on the nanocarriers and their release pattern are evaluated in simulated gastrointestinal environments by electrophoresis. The XRD patterns reveal that the nanocarriers could preserve their structure during various synthesis levels. The saturation magnetization (M
s) of the Fe3O4 cores are 56.48 emu g−1 without any magnetic hysteresis. Not only does the loaded pDNA contents experience a remarkable stability in the simulated gastric environment, but also, they could be released up to 99% when exposed to an alkaline environment similar to the intestinal fluid of fish. The results indicate that the synthesized nanoparticles could be employed as efficient low-cost pDNA carriers.
Prominent antibacterial effect of sub 5 nm Cu nanoparticles/MoS2 composite under visible light
Authors: Li Jingze , Ma Jiaxin , Hong Liu , Yang Cheng 
Published: November 2021

Abstract
Achieving an efficient and inexpensive bactericidal effect is a key point for the design of antibacterial agent. Recent advances have proved molybdenum disulfide (MoS2) as a promising platform for antimicrobial applications, while the combination of metal nanoparticle would promote the antibacterial efficiency. Nevertheless, the dispersivity, cheapness and safety of metal nanoparticle loaded on MoS2 raised some concerns. In this paper, we successfully realized a uniform decoration of copper nanoparticles (CuNPs) on surface of MoS2 nanosheets, and the size of CuNPs could be controlled below 5 nm. Under 5 min irradiation of 660 nm visible light, the synthesized CuNPs/MoS2 composite demonstrated superior antibacterial performances (almost 100% bacterial killed) towards both Gram-negative E. coli and Gram-positive S. aureus over the single component (Cu or MoS2), while the bactericidal effect could last for at least 6 h. The synergism of photodynamic generated hydroxyl radical (·OH), oxidative stress without reactive oxygen species production and the release of Cu ions was considered as the mechanism for the antibacterial properties of CuNPs/MoS2. Our findings provided new insights into the development of two-dimensional antibacterial nanomaterials of high cost performance.