bluuebunny/crossref_metadata_2025_split huggingface dataset:
Luxação anterior recorrente do ombro após traumatismo com fratura apófise coracoide – Uma associação rara
Authors: Ferreira Filomena , Branco Ricardo , Silva Rómulo , Areias Margarida , Oliveira Carolina , Silva Norberto 
Published: April 2021

ResumoAs luxações anteriores representam cerca de 96% do total de luxações do ombro, sendo a recidiva/instabilidade mais comum em pacientes jovens. A lesão de outras estruturas do ombro é frequente, nomeadamente a lesão óssea de Bankart. Contudo, a associação com a fratura da apófise coracoide é muito rara.Este artigo descreve o caso clínico de um homem de 67 anos que recorreu ao serviço de urgência com queixas de omalgia persistente, com episódios de agudização, iniciados após queda da própria altura. O paciente apresentava ainda histórico de trauma do ombro 3 meses antes, avaliado em outro hospital. A luxação anterior do ombro foi constatada radiograficamente, e a tomografia computorizada (TC) do ombro confirmou erosão óssea da vertente anteroinferior da glenoide (perda óssea de cerca de 50% do diâmetro anteroposterior na região inferior da glenoide), com reabsorção quase completa de lesão óssea de Bankart (aparente em análise a posteriori da radiografia do episódio traumático inicial). Associadamente, foi diagnosticada uma fratura transversa da apófise coracoide (tipo II da classificação de Ogawa). O paciente foi submetido ao tratamento cirúrgico, com confecção do batente ósseo anterior utilizando remanescente do fragmento fraturado do coracoide suplementado por enxerto autólogo tricortical do ilíaco, fixados com parafusos canulados (de acordo com as técnicas de Bristow-Latarjet e Eden-Hybinett).No seguimento pós-operatório, foi observado um bom resultado funcional, sem novos episódios de luxação e sem queixas álgicas significativas.Descreve-se uma associação rara de lesões do ombro, e salienta-se o desafio do tratamento das mesmas dado o seu diagnóstico tardio, como no caso apresentado.
Avaliação radiográfica do alinhamento pós-operatório na artroplastia total de joelho
Authors: Thomaz Leonardo Dalla Giacomassa Rocha , Geist João Guilherme Brochado , Lucena Rafael De Luca De , Schwartsmann Carlos Roberto , Freitas Geraldo Luiz Schuck de , Spinelli Leandro de Freitas 
Published: April 2021

Resumo
Objetivo Demonstrar a maior acurácia das radiografias panorâmicas de membros inferiores (longas) em relação às radiografias curtas do joelho na medida do eixo mecânico do membro inferior após a artroplastia total de joelho (ATJ).
Métodos Foi realizado um estudo retrospectivo para avaliar a acurácia de imagens radiográficas longas e curtas pós-operatórias de 70 pacientes submetidos à ATJ em nosso serviço. As imagens foram analisadas ao acaso, em momentos distintos, por três ortopedistas. Em todas as imagens, o eixo mecânico do membro, do fêmur e da tíbia foram traçado,s e os ângulos femorotibiais (AFTs) foram calculados. O coeficiente de correlação intraclasse (CCI) foi calculado para avaliar a concordância da medida do eixo mecânico inter e intraobservador.
Resultados Observou-se que houve alta concordância intra e interobservador quando utilizamos radiografias panorâmicas, apresentando CCI mínimo intrae interobservador de 0,89, equivalente a uma concordância fortíssima. Já nas radiografias curtas na incidência anteroposterior (AP) do joelho, o CCI mostrou-se com concordância moderada, obtendo valor máximo de 0,75.
Conclusão Existe uma diferença significativa na acurácia para a medida do eixo mecânico do membro inferior, comparando-se radiografias longas e curtas do membro inferior. Assim, para a adequada mensuração do eixo mecânico do membro inferior, sugerimos a realização de radiografia longa no pós-operatório de ATJ.
Avulsão da eminência tibial em uma fratura do platô tibial – Nossa abordagem: Um caso clínico
Authors: Silva Rómulo , Barreto José , Ferreira Filomena , Areias Margarida , Oliveira Carolina , Alpoim Bruno 
Published: April 2021

ResumoUma paciente de meia-idade com fratura do platô tibial e avulsão da eminência tibial foi tratada com uma combinação de fixação do platô com placa medial e sutura da eminência com fio não absorvível auxiliada por artroscopia.Nossa técnica para fraturas com avulsão da eminência tibial não interfere nos materiais de osteossíntese do platô tibial e, mais uma vez, teve bons resultados no tratamento de lesões combinadas e complexas do joelho.
Homeostatic regulation of T follicular helper and antibody response to particle antigens by IL-1Ra of medullary sinus macrophage origin
Authors: Lin Xinwen , Twelkmeyer Trix , Zhu Danming , Zhang Li , Zhao Yang , Zhang Chao , Iwakura Yoichiro , Meng Guangxun , Hua Zhaolin , Yan Bingyu , Liu William J. , Luo Zhongguang , Gong Sitang , Chen Hairong , Li Shuran , Hou Baidong , Tang Hong 
Published: April 2021

SignificanceAlthough the global hepatitis B virus (HBV) vaccination program has been overwhelmingly successful, it still carries 5% to 10% of nonresponders at risk for HBV infection. The key immunoregulatory factors preventing the desired humoral protection are still poorly defined. This work has not only addressed fundamental mechanisms of how lymph node sinus macrophages regulate immunogenicity of particle antigens like HBV vaccine but also suggested interleukin-1 receptor antagonist neutralization might be a viable strategy to boost antibody response in these nonresponders.
Large ecosystem-scale effects of restoration fail to mitigate impacts of land-use legacies in longleaf pine savannas
Authors: Brudvig Lars A. , Turley Nash E. , Bartel Savannah L. , Bell-Dereske Lukas , Breland Sabrie , Damschen Ellen I. , Evans Sarah E. , Gibbs Jason , Hahn Philip G. , Isaacs Rufus , Ledvina Joe A. , Orrock John L. , Sorenson Quinn M. , Stuhler John D. 
Published: April 2021

SignificanceThe restoration of degraded ecosystems is a global priority, yet successful restoration is challenged by the lingering degrading impacts of human land-use activities, like agriculture. Using a large-scale experiment within the longleaf pine ecosystem, we evaluate how 45 abiotic and biotic ecological properties are affected by legacies of past farming and conversion to pine plantations, as well as contemporary restoration activities to reinstate savanna conditions. Restoration had large and beneficial effects on this ecosystem regardless of land-use history, but a suite of conditions remained persistently altered by land-use legacies even after restoration. Ongoing advances to ecosystem restoration should target persistent legacy effects, to maximize the conservation potential of ecosystems recovering from intensive human use.
GPR182 is an endothelium-specific atypical chemokine receptor that maintains hematopoietic stem cell homeostasis
Authors: Le Mercier Alan , Bonnavion Remy , Yu Weijia , Alnouri Mohamad Wessam , Ramas Sophie , Zhang Yang , Jäger Yannick , Roquid Kenneth Anthony , Jeong Hyun-Woo , Sivaraj Kishor Kumar , Cho Haaglim , Chen Xinyi , Strilic Boris , Sijmonsma Tjeerd , Adams Ralf , Schroeder Timm , Rieger Michael A. , Offermanns Stefan 
Published: April 2021

Significance
G protein–coupled receptors (GPCRs) are important regulators of cellular and biological functions and are primary targets of therapeutic drugs. About 100 mammalian GPCRs are still considered orphan receptors because they lack a known endogenous ligand. We report the deorphanization of GPR182, which is expressed in endothelial cells of the microvasculature. We show that GPR182 is an atypical chemokine receptor, which binds CXCL10, 12, and 13. However, binding does not induce downstream signaling. Consistent with a scavenging function of GPR182, mice lacking GPR182 have increased plasma levels of chemokines. In line with the crucial role of CXCL12 in hematopoietic stem cell homeostasis, we found that loss of GPR182 results in increased egress of hematopoietic stem cells from the bone marrow.
Capillary equilibrium of bubbles in porous media
Authors: Wang Chuanxi , Mehmani Yashar , Xu Ke 
Published: April 2021

SignificanceWe show how pore geometry modulates the capillary equilibrium states of a trapped bubble inside a porous medium using a simple conceptual model. The model explains recently published data on bubbles trapped in porous rock samples. We explain the counterintuitive observation that bubbles with large surface areas in the subsurface can remain thermodynamically stable for geologically long times. The stability is the result of a modified relationship between a bubble’s surface free energy and volume due to geometric confinement. The implications are relevant to applications ranging from petroleum recovery, to CO2sequestration, to groundwater oxygen supply, and to fuel-cell water management.
Affleck-Dine inflation in supergravity
Authors: Kawasaki Masahiro , Ueda Shusuke 
Published: April 2021

Abstract
Affleck-Dine inflation is a recently proposed model in which
a single complex scalar field, nonminimally coupled to gravity,
drives inflation and simultaneously generates the baryon asymmetry
of universe via Affleck-Dine mechanism. In this paper we
investigate the supersymmetric implementation of Affleck-Dine
inflation in the use of two chiral superfields with appropriate
superpotential and Kähler potential. The scalar potential has a
similar form to the potential of original Affleck-Dine inflation,
and it gives successful inflation and baryogenesis. We also
consider the isocurvature perturbation evolving after crossing the
horizon, and find that it is ignorable and hence consistent with the
observations.
Fundamental limits on constraining primordial non-Gaussianity
Authors: Kalaja Alba , Meerburg P. Daniel , Pimentel Guilherme L. , Coulton William R. 
Published: April 2021

Abstract
We study the cosmic variance limit on constraining
primordial non-Gaussianity for a variety of theory-motivated
shapes. We consider general arguments for 2D and 3D surveys, with a
particular emphasis on the CMB. A scale-invariant N-point
correlator can be measured with a signal-to-noise that naively
scales with the square root of the number of observed modes. This
intuition generally fails for two reasons. First, the
signal-to-noise scaling is reduced due to the blurring of the last
scattering surface at short distances. This blurring is caused by
the combination of projection and damping, but the loss of signal is
not due to exponential decay, as both signal and noise are equally
damped. Second, the behavior of the N-point correlator in the
squeezed and collapsed (for N > 3) limits can enhance the scaling of
the signal-to-noise with the resolution, even with a reduced range
of momenta probing these limits. We provide analytic estimates for
all N-point correlators. We show that blurring affects
equilateral-like shapes much more than squeezed ones. We discuss
under what conditions the optimistic scalings in the collapsed limit
can be exploited. Lastly, we confirm our analytical estimates with
numerical calculations of the signal-to-noise for local, orthogonal
and equilateral bispectra, and local trispectra. We also show that
adding polarization to intensity data enhances the scaling for
equilateral-like spectra.
The imitation game: Proca stars that can mimic the Schwarzschild shadow
Authors: Herdeiro Carlos A.R. , Pombo Alexandre M. , Radu Eugen , Cunha Pedro V.P. , Sanchis-Gual Nicolas 
Published: April 2021

Abstract
Can a dynamically robust bosonic star (BS) produce an (effective) shadow that mimics that of a black hole (BH)? We focus on models of spherical BSs with free scalar or vector fields, as well as with polynomial or axionic self-interacting fields. The BH shadow is linked to the existence of light rings (LRs). For free bosonic fields, yielding mini-BSs, it is known that these stars can become ultra-compact — i.e., possess LRs — but only for perturbatively unstable solutions. We show this remains the case even when different self-interactions are considered.
However, an effective shadow can arise in a different way: if BSs reproduce the existence of an innermost stable circular orbit (ISCO) for timelike geodesics (located at r
ISCO = 6M for a Schwarzschild BH of mass M), the accretion flow morphology around BHs is mimicked and an effective shadow arises in an astrophysical environment. Even though spherical BSs may accommodate stable timelike circular orbits all the way down to their centre, we show the angular velocity Ω along such orbits may have a maximum away from the origin, at R
Ω; this scale was recently observed to mimic the BH's ISCO in some scenarios of accretion flow. Then: (i) for free scalar fields or with quartic self-interactions, R
Ω ≠ 0 only for perturbatively unstable BSs; (ii) for higher scalar self-interactions, e.g. axionic, R
Ω ≠ 0 is possible for perturbatively stable BSs, but no solution with R
Ω = 6M was found in the parameter space explored; (iii) but for free vector fields, yielding Proca stars, perturbatively stable solutions with R
Ω ≠ 0 exist, and indeed R
Ω = 6M for a particular solution. Thus, dynamically robust spherical Proca stars succeed in the imitation game: they can mimic the shadow of a (near-)equilibrium Schwarzschild BH with the same M, in an astrophysical environment, despite the absence of a LR, at least under some observation conditions, as we confirm by explicitly comparing the lensing of such Proca stars and Schwarzschild BHs.
Method for calculating coupling coefficient in W-type multimode optical fibers
Authors: Savović S , Djordjevich A 
Published: April 2021

Abstract
A simple method is proposed for determining the mode coupling coefficient D in W-type (double clad) multimode optical fibers. It only requires the observation of the far-field output pattern for one fiber length with the input light launched centrally along the fiber axis (θ
0= 0). For illustration, the coupling coefficient determined by this simple method for a W-type multimode glass optical fiber was used to calculate the coupling length L
c at which the equilibrium mode distribution is achieved.
Exact relations for two-photon-exchange effect in elastic ep scattering by dispersion relation and hadronic model *
Authors: Cao Hui-Yun , Zhou Hai-Qing 
Published: April 2021

Abstract
The two-photon-exchange (TPE) effect plays a key role in extracting the form factors (FFs) of the proton. In this work, we discuss several exact properties of the TPE effect in the elastic

scattering. By taking four low energy interactions as examples, we analyze kinematical singularities, asymptotic behaviors, and branch cuts of TPE amplitudes. The analytical expressions clearly indicate several exact relations between the dispersion relation (DR) and hadronic model (HM) methods. This suggests that the two methods must be modified to general forms, while novel forms yield the same results. After the modification, new DRs include a non-trivial term with two singularities. Furthermore, new DRs automatically include contributions due to the seagull interaction, meson-exchange effect, contact interactions, and off-shell effect. To analyze the elastic

scattering data sets, the new forms must be used.
Indoor navigation system using radio tomography
Authors: Styła M , Adamkiewicz P , Niderla K , Rymarczyk T 
Published: April 2021

Abstract
The article describes a non-invasive radio tomography system aimed at increasing the accuracy of tracking objects inside buildings. It uses electromagnetic waves with frequencies from ISM 2.4 GHz band, thanks to which it covers such communication protocols as Bluetooth, Wi-Fi and ZigBee. It is primarily intended to detect organic life forms such as humans. The result of its operation is 2D imaging in the form of a heat map.
CT and the Readiness of the Education in Jakarta to Face VUCA Due to the Covid-19 Pandemic.
Authors: Yani Achsan Harry Tursulistyono , Wibowo Wahyu Catur , Harsanti Putri Wahyuningdiah Trisari , Hendrowati Retno , Dikara Barcah Quintin Kurnia 
Published: April 2021

Abstract
Jakarta as the capital city is viewed as the barometer of every city in Indonesia. The city preparedness to face VUCA (Volatility, Uncertainty, Complexity and Ambiguity) caused by Covid-19 pandemic is also in the national spotlight. One of the main solutions to face VUCA is Computational Thinking (CT). CT provides the ability to approach VUCA characteristics by systematically ingraining abstraction, algorithmic thinking, decomposition, and pattern recognition in mind. For this reason, Jakarta plans to disseminate this concept to students as early as possible, namely by embedding CT to every subject in primary and secondary schools. The activity began with online CT socialization, which was attended by 1,761 teachers, of which 238 via Google Meet and 1,523 via live streaming. In this activity we also distributed questionnaires to 258 elementary and junior high school teachers spread across 41 sub-districts of 44 sub-districts in Jakarta. The result is that 93.8% of teachers in Jakarta do not understand CT, excitingly 69.4% of teachers wish to teach CT in the subjects they can afford even though it is not compulsory, but if it is obligatory then all teachers will implement it.
A proposal of the hybrid energy transfer pipe
Authors: Ivanov Yury V , Watanabe Hirofumi , Chikumoto Noriko , Inoue Noriyuki , Takano Hirohisa , Kanda Masae , Yamaguchi Satarou 
Published: April 2021

Abstract
Among the many modifications of superconducting power transmission lines, hybrid lines stand out for their originality. Their design implies the joint transmission of cold liquid fuel through the pipe and electricity through the high-temperature superconducting (HTS) cable cooled by this fuel directly or indirectly. Currently, the critical temperatures of HTS materials are low and that means that only liquid hydrogen can be the “cooling fuel”. It is known that natural gas is a viable alternative to hydrogen as a chemical fuel for many reasons. Since its boiling temperature is too high, the use of liquefied natural gas (LNG) in hybrid lines is considered only in the future when suitable HTS materials will be discovered. Assuming that LNG cannot be used to cool HTS cable over the coming years, we propose to combine the LNG pipeline and the cable pipelines cold by liquid nitrogen in the common heat-insulating pipe. In addition to the considerable economic effect due to the common thermal insulation, the LNG cold will be utilized to cool the radiation shield that prevents the penetration of heat to the cable pipes.
Improvement of 4 K cooling power by coaxial pipe regenerator for a Gifford-McMahon cryocooler
Authors: Masuyama S , Matsumoto K , Numazawa T 
Published: April 2021

Abstract
This paper presents the experimental results of 4.2 K cooling power of a Gifford-McMahon (G-M) cryocooler. To improve the cooling power, an original regenerator structure named coaxial pipe regenerator was applied to the second stage regenerator. This structure is that a stainless steel pipe is inserted in the coaxial direction of the second stage regenerator. An effect of the coaxial pipe is considered to rectify the helium flow in the regenerator that leads to an increase in the mass flow rate to the expansion space. Then, an improvement in the cooling power is expected. The second stage regenerator is comprised of three-layer of Pb (warm side), HoCu2 (middle) and Gd2O2S (cold side) spheres of which the volume filling rate is 50, 20 and 30%, respectively. The coaxial pipe is applied to each material layer independently to survey an improvement effect of the cooling power at 4.2 K. These coaxial pipe regenerators were tested with a G-M cryocooler of one-watt model (RDK-408D2, SHI) and a scroll-type compressor (SSC-3700, SUZUKISHOKAN). The three-layer regenerator (without coaxial pipe) obtained the cooling power of 1.70 W. When the coaxial pipe was applied to the Pb layer, the cooling power of 1.79 W was achieved with the electrical input of compressor of 7.06 kW. In contrast, the coaxial pipe of HoCu2 layer and Gd2O2S layer showed no conspicuous improvement. These results prove that the flow condition of helium in the Pb layer significantly affects the 4 K cooling power.
Measurement of Decay Time Constant of Shielding Current in ITER-TF Joint Samples
Authors: Imagawa S , Kajitani H , Obana T , Takada S , Hamaguchi S , Chikaraishi H , Onodera Y , Takahata K , Matsui K , Koizumi N 
Published: April 2021

Abstract
Joint sample tests have been carried out as a qualification test for ITER Toroidal Field (TF) coils. The joint sample comprises two short TF conductors that have “twin-box” joint terminals at both ends. The lower joint is a testing part that is a full size joint of the TF coils. Hall probes are attached on the lower joint box at around the center of the external field coil of the test facility. The magnetic field induced by shielding currents in the joint can be estimated from the difference between the measured magnetic field strength and the magnetic field generated by the external field coil. The magnetic field by the shielding currents during shut-off of the external field coil from -1.0 T is evaluated for six samples. The decay time constants of the shielding currents are gradually elongated with decrease of the shielding currents in all the samples. In comparison with simulation results, it is considered that the main shielding current flows in superconducting cables in the two conductors with crossing the jointed plane and that the joint resistance is decreased at low total current.
Reliable long-term operation of superconducting bus lines for the LHD
Authors: Hamaguchi S , Moriuchi S , Noguchi H , Tanoue H , Mito T 
Published: April 2021

Abstract
The Large Helical Device (LHD) is an experimental device for helical type fusion plasma in National Institute for Fusion Science and plasma experiments over 150,000 shots have been successfully conducted during twenty long-term plasma experimental campaigns. The LHD has two kinds of superconducting magnets and nine flexible superconducting bus lines with an average length of 55 m, which are utilized as a part of the current feeder system between the coils and the power sources. The superconducting bus lines consist of a pair of aluminum stabilized NbTi/Cu compacted stranded cable insulated electrically and coaxial five corrugated stainless steel tubes with two layers of vacuum insulations. The nominal current is 32 kA and the withstand voltage is 5 kV in 77 K gas helium. From the first experimental campaign, the superconducting bus lines have been stably operated at steady state by using automatic control. It is also confirmed that the status of the superconducting bus lines are kept good thanks to appropriate maintenances. As the results, the reliable operation of the superconducting bus lines has been achieved during the plasma experimental campaigns without any serious failure and the total operational time of the steady state cooling is approximately 58,000 hours.
Modelling the Energy Losses of a Superconducting Magnetic Bearing due to the Change of the Levitation Height Under Gravity
Authors: Ishida Y , Enokida H , Ahmad D , Terao Y , Ohsaki H , Sakurai Y , Sugai H , Matsumura T , Katayama N 
Published: April 2021

Abstract
This paper describes the losses of the rotor of the prototype superconducting magnetic bearing (SMB) that is employed for a polarization modulator of a Cosmic Microwave Background polarization experiment. The stator is composed of 20 segmented YBCO bulks, and these multiple superconductors produce the inhomogeneous magnetic field particularly due to the gravitational displacement of the rotor magnet position from the initial field cooling. This inhomogeneity causes the power dissipation to the spinning rotor. We estimated the power dissipation originating from this inhomogeneous magnetic field by using a numerical approach. The superconductors were modelled as electrically conducting components in the numerical simulation to avoid the complexity in modelling superconductivity. The results show about 4 mW dissipated at the rotor.