bluuebunny/crossref_metadata_2025_split huggingface dataset:
Alívio da dor após bloqueio do gânglio ímpar e ablação por radiofrequência em pacientes com coccigodínia: Uma revisão sistemática
Authors: Choudhary Ranjeet , Kunal Kishor , Kumar Dhirendra , Nagaraju Venishetty , Verma Shilp 
Published: October 2021

ResumoQuase 90% dos casos de coccigodínia podem ser tratados por meio de tratamento clínico conservador; os 10% restantes precisam de outras modalidades invasivas para o alívio da dor, como o bloqueio do gânglio ímpar (BGI) ou ablação por radiofrequência (ARF) do gânglio ímpar. Com o objetivo de avaliar a eficácia do BGI e ARF do gânglio ímpar no controle da dor em pacientes com coccigodínia, foi realizada uma pesquisa sistemática no PubMed, MEDLINE e Google Scholar, a fim de identificar estudos que relatam o alívio da dor, em termos de Escala Visual Analógica (EVA) ou dos seus homólogos, após o BGI ou ARF em pacientes com coccigodínia por 2 autores diferentes, de acordo com as diretrizes PRISMA. Foram definidos sete estudos com um total de 189 pacientes (104 no grupo BGI e 85 no grupo ARF). No grupo BGI, a média da pontuação EVA melhorou de 7,83 no início do estudo para 3,11 no acompanhamento de curto prazo, 3,55 no acompanhamento de médio prazo e 4,71 no acompanhamento de longo prazo. No grupo ARF, a média da pontuação EVA melhorou de 6,92 no início do estudo, 4,25 no acompanhamento de curto prazo e 4,04 no acompanhamento de longo prazo. No grupo BGI foram relatadas 13,92% de falhas (11/79) e complicações de 2,88% (3/104), enquanto que no grupo ARF foram relatadas 14,08% de falhas (10/71) e nenhuma complicação (0%). A taxa total de êxito foi >85% em qualquer uma das modalidades. O BGI e ARF do gânglio ímpar fornecem um método confiável e provavelmente excelente no controle da dor, em pacientes com coccigodínia que não respondem ao tratamento médico conservador. No entanto, deve ser estabelecido um limite entre os que responderam, os que não responderam e aqueles não respondedores tardios, sendo necessários estudos mais amplos com acompanhamento mais longo (>1 ano).
Prevalência de displasia do desenvolvimento do quadril em uma maternidade de São Paulo, Brasil
Authors: Motta Giovanna Galvão Braga , Chiovatto Alessandra Rodrigues Silva , Chiovatto Eduardo Davino , Duarte Márcio Luís , Rodrigues Natasha Vogel Majewski , Iared Wagner 
Published: October 2021

Resumo
Objetivo Avaliar a prevalência de displasia de desenvolvimento de quadril (DDQ), ou seja, quadris de tipo de Graf IIc ou maior, em amostra da população de recém-nascidos de 0 a 3 dias de vida, e correlacionar os achados com os principais fatores de risco descritos na literatura.
Métodos Estudo observacional, transversal e prospectivo em amostra de recém-nascidos, em um hospital maternidade em São Paulo, para avaliar a prevalência da DDQ diagnosticada pelo método de Graf e verificar sua correlação com os fatores de risco.
Resultados Um total de 678 recém-nascidos foram submetidos a ultrassonografia de quadril (1.356 quadris). A prevalência de DDQ (quadris tipo IIc, D, IIIa, IIIb, e IV de Graf) foi de 5,46%. A análise de regressão logística mostrou razões de chances (RCs) com significância estatística para os parâmetros etnia branca (RC = 2.561; intervalo de confiança de 95% [IC95%]: 1,07 a 6,11), multiparidade (RC = 3,50; IC95%: 1,62 a 7,38), sexo feminino (RC = 4,95; IC95%: 1,86 a 13,13), e apresentação pélvica (RC = 2,03; IC95%: 1,01 a 4,11).
Conclusão A prevalência de DDQ na amostra foi de 5,45% usando a ultrassonografia como método de diagnóstico. Este resultado é diferente do dos estudos que avaliam a prevalência exclusivamente do exame físico (manobra de Ortolani). Os principais fatores de risco associados ao maior risco de DDQ foram recém-nascidos do sexo feminino, com apresentação pélvica, primogênitos, e de etnia branca.
The degree of maternal nutrient restriction during late gestation influences the growth and endocrine profiles of offspring from beef cows
Authors: López Valiente S. , Rodriguez A. M. , Long N. M. , Lacau-Mengido I. M. , Maresca S. 
Published: October 2021

Context Cow–calf operations in Argentina are managed under extensive grazing condition and the quality of forages is often poor during the second half of gestation. The severity of nutrient restriction in bovine gestation, caused by seasonal pasture production, often results in poor production traits in progeny. Aims The objective of the current study was to determine whether different levels of maternal nutrient intake in beef cows during late gestation affect fetal and postnatal growth, glucose metabolism, and insulin-like growth factor 1 (IGF1) concentrations in offspring of beef cattle. Methods At 180 ± 4 days of gestation, multiparous Angus cows (n = 56) were blocked by bodyweight (BW) and expected calving date, and assigned to pens (2 or 3 cows/pen). Pens (n = 8 per treatment) were then randomly assigned to the following treatments: severely restricted (SR; 50% of net energy and 58% of CP requirements), moderately restricted (MR; 75% of net energy and 85% of CP requirements), or control (CON; 100% of net energy and 116% of CP requirements). Pen was the experimental unit and data were analysed by ANOVA or repeated measures analysis, as appropriate. After calving, all cows were managed in a single group until weaning. Key results Cow BW and body condition score decreased as nutritional restriction increased (P < 0.05). At parturition, birth weight of calves from SR dams and MR dams was lower than that of calves from CON dams (P = 0.05; 4.9 kg and 2.1 kg respectively). Average daily gain of calves from birth to 24 days of age was higher (P = 0.01) in calves from SR dams than in calves from CON and MR dams. Calves from MR dams were lighter (P = 0.04) than were calves from SR and CON dams at weaning. Treatments did not affect milk production or composition (P > 0.10) or glucose–insulin metabolism of offspring during lactation (P > 0.10). Concentration of IGF1 tended to be lower in MR progeny than in SR and CON progeny during lactation (P = 0.09). Conclusions Late gestation maternal nutrient restriction, irrespective of the severity of the restriction, decreased birth weight of offspring; however, severe nutrient restriction induced early postnatal compensatory growth. Implications The severe nutritional restriction produced calves with weaning weights indistinguishable from the control cows due to early postnatal compensatory growth. However, the longer-term effects of nutritional restriction of the dam in the second half of pregnancy on metabolic and reproductive performance in replacement heifers or meat production/quality in steers is yet to be determined.
The effect of filler complexity and context on the acceptability of wh-island violations in
Dutch
Authors: Beljon Maud , Joosen Dennis , Koeneman Olaf , Ploum Bram , Sommer Noëlle , de Swart Peter , Wilms Veerle 
Published: October 2021

Abstract
Acceptability judgements of syntactic island violations are often claimed to improve by either increasing the
complexity of the wh-filler phrase or integrating the violating sentence into a discourse. In two acceptability
judgement tasks, we looked at wh-island violations in Dutch by varying the complexity of the filler phrase and by
presenting the sentences either in isolation or with a preceding discourse. We found that neither variable had a significant
effect in isolation, but that only in their combination a significant effect was observed. The same effect showed up in non-island
conditions, however. This is in contrast to findings in the literature on English and French and suggests that the complexity
effect in Dutch is not syntactic. We therefore conclude that wh-islands are strong islands in Dutch (Broekhuis & Corver 2015) and show that the contrast with English and French can be
made to follow from featural Relativized Minimality (Rizzi 2017), taking into account
the verb second property of Dutch.
Ta as an emergent language practice of audience design in CMC
Authors: Sluchinski Kerry 
Published: October 2021

Abstract
This study examines the use of ungendered third person Chinese pronoun ta in digital first-and-third
person voiced discourses (i.e. small stories). The study asks what implications the script choice ta, as opposed to
gendered 他 ta ‘he’ and 她 ta ‘she’, has for audience design and the facilitation
of character empathy. The study draws on 131 digital texts from celebrity verified accounts on social media platform Sina Weibo in October
2015. From a Discourse Analytical perspective focused on deixis relative to the notion of empathy in storytelling, the study investigates
emergent practices which involve the orthographic manipulation of gender. The study proposes that ta is an interpersonal
resource whose deictic properties as a non-standard spelling are exploited as a property of audience design to facilitate an appeal to
empathy. This facilitation is advanced by the script choice which offers a wider scope of reference, and thus targets a wider audience.
Technique and the Threat of Deethicalization
Authors: Sidnell Jack 
Published: October 2021

AbstractStudents at a yoga school in southern India learn physically demanding sequences of āsana (posture, pose) that they conceptualize as tools with which to cultivate inner qualities. In a wide range of contexts, teachers and master practitioners insist that these techniques of the body must be executed in particular ways and accompanied by specific mental states if they are to have their intended ethical effects. Yoga is thus understood to combine outwardly observable technique with an unobservable yet essential, inner component. One consequence of this to which students and teachers are pervasively oriented is that the techniques become vulnerable to a kind of deethicalization by which they are “bleached” of their spiritual content and reduced to mere physical exercise. The paper begins by comparing concerns about deethicalization among yoga practitioners with similar ideas about folklorization among participants in a women’s mosque movement described by Mahmood (2012). I then turn to consider three semiotic processes relevant to the specific case: circumscription, performed demonstration and photographically enhanced entextualization.
International comparison CCQM-K117 ammonia
Authors: Veen Adriaan M H van der , Wijk Janneke I T van , Harris Kimberly , Goodman Cassie , Hodges Joseph , Uehara Shinji , Kang Ji Hwang , Kim Yong Doo , Kim Dal Ho , Lee Sangil , Worton David R , Bartlett Sam , Aswegen Sivan van , Brewer Paul J , Efremova Olga V , Zhang Tiqiang , Wang Defa , Han Qiao , Zeyi Zhou , Iturrate-Garcia Maitane , Pascale Céline , Niederhauser Bernhard 
Published: October 2021

Main text
At the highest metrological level, ammonia gas standards are commonly prepared gravimetrically as Primary Standard Mixtures or using a dynamic standard. This international key comparison addressed the measurement of the amount fraction ammonia in nitrogen, to support calibration and measurement services for mainly environmental applications. The nominal amount fraction was 14 μmol mol-1. The results in this Track C key comparison on the composition of biogas are generally good.
To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.
The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Characterization of the seismic field at Virgo and improved estimates of Newtonian-noise suppression by recesses
Authors: Singha Ayatri , Hild Stefan , Harms Jan , Tringali Maria C , Fiori Irene , Paoletti Federico , Bulik Tomasz , Idzkowski Bartosz , Bertolini Alessandro , Calloni Enrico , De Rosa Rosario , Errico Luciano , Gennai Alberto 
Published: October 2021

Abstract
Fluctuations of gravitational forces cause so-called Newtonian noise (NN) in gravitational-wave detectors which is expected to limit their low-frequency sensitivity in upcoming observing runs. Seismic NN is produced by seismic waves passing near a detector’s suspended test masses. It is predicted to be the strongest contribution to NN. Modeling this contribution accurately is a major challenge. Arrays of seismometers were deployed at the Virgo site to characterize the seismic field near the four test masses. In this paper, we present results of a spectral analysis of the array data from one of Virgo’s end buildings to identify dominant modes of the seismic field. Some of the modes can be associated with known seismic sources. Analyzing the modes over a range of frequencies, we provide a dispersion curve of Rayleigh waves. We find that the Rayleigh speed in the NN frequency band 10–20 Hz is very low (≲100 m s−1), which has important consequences for Virgo’s seismic NN. Using the new speed estimate, we find that the recess formed under the suspended test masses by a basement level at the end buildings leads to a 10 fold reduction of seismic NN.
Exploring oscillations with a nonlinear restoring force
Authors: Kontomaris S V , Malamou A 
Published: October 2021

Abstract
When exploring the oscillation of an object for small displacements from the equilibrium position, the magnitude of the applied force is approximately considered to be proportional to the object’s displacement. However, for bigger displacements, studied in this paper, the magnitude of the applied force is best approximated to an equation of the form F = S|x|
n
, n > 0. In this paper accurate and approximate equations regarding the period of the oscillation and also approximate functions regarding the object’s position with respect to time are being derived. The interesting result is the simplicity of the equation that relates the period to the exponent n and the oscillation’s amplitude at the domain 0 < n ⩽ 2. It is also shown that the force data in many well-known cases can be fitted to the aforementioned equation; typical examples are the polynomial force law, the impact of a sphere on a surface, the free oscillations of an atomic force microscopy tip at the end of a cantilever, the simple pendulum’s free oscillation, etc. Thus, the methodology and the findings presented in this paper can be applied to a variety of different situations under the restriction that the force data can be approximately described by an equation of the form F = S|x|
n
, n > 0.
2D and 3D double perovskite with dimensionality-dependent optoelectronic properties: first-principle study on Cs2AgBiBr6 and Cs4AgBiBr8
Authors: Chen Yan-Long , Yan Dan-Ni , Zeng Ming-Wei , Liao Cheng-Sheng , Cai Meng-Qiu 
Published: October 2021

Abstract
Recently, the effect of dimensional control on the optoelectronic performance of two-dimensional (2D)/three-dimensional (3D) single perovskites has been confirmed. However, how the dimensional change affects the photoelectric properties of 2D/3D all-inorganic double perovskites remains unclear. In this study, we present a detailed theoretical research on a comparison between the optoelectronic properties of 3D all-inorganic double perovskite Cs2AgBiBr6 and recently reported 2D all-inorganic double perovskite Cs4AgBiBr8 with Ruddlesden–Popper (RP) structure based on density functional theory calculations. The results demonstrate the charge carrier mobility and absorption coefficients in the visible spectrum of Cs4AgBiBr8 (2D) is poorer than Cs2AgBiBr6 (3D). Moreover, the value of exciton-binding energy for 2D RP all-inorganic double perovskite Cs4AgBiBr8 (720 meV) is 3 times larger than that of 3D all-inorganic double perovskite Cs2AgBiBr6 (240 meV). Our works indicate that Cs4AgBiBr8 (2D) is a promising material for luminescent device, while Cs2AgBiBr6 (3D) may be suitable for photovoltaic applications. This study provides a theoretical guidance for the understanding of 2D RP all-inorganic double perovskite with potential applications in photo-luminescent devices.
Plasma wakefield acceleration beyond the dephasing limit with 400 GeV proton driver
Authors: Lotov K V , Tuev P V 
Published: October 2021

Abstract
A new regime of proton-driven plasma wakefield acceleration is discovered, in which the plasma nonlinearity increases the phase velocity of the excited wave compared to that of the protons. If the beam charge is much larger than minimally necessary to excite a nonlinear wave, there is sufficient freedom in choosing the longitudinal plasma density profile to make the wave speed close to the speed of light. This allows electrons or positrons to be accelerated to about 200 GeV with a 400 GeV proton driver.
Development of a novel magnetorheological brake with zigzag magnetic flux path
Authors: Nguyen Quoc Hung , Nguyen Van Bien , Le Hiep Dai , Duyen Do Qui , Li Weihua , Hung Nguyen Xuan 
Published: October 2021

Abstract
In this research work, a novel disc-type configuration of magneto-rheological brake (MRB) with zigzag magnetic flux path is proposed. In this design, a rotor component consisting of several magnetic plates integrated in a disc made of non-magnetic material is implemented. A magnetic plate is separated with the others by nonmagnetic separators of the disc. Corresponding magnetic plates and separators are also implemented on the housing of the MRB. With this configuration, the magnetic flux line is forced to cross the MR fluid (MRF) duct from the disc to the housing at this separator and then from the housing to the disc at the next separator. This results in a zigzag magnetic flux path between the disc and the housing. The separators on each side of the housing are integrated on a bobbin, on which the magnetic coil is installed. When counter currents are applied to the coils on each side of the housing, a mutual magnetic field with zigzag flux lines across the MRF duct is generated. Based on the electromagnetic finite element and torque analysis, optimization problem considering the maximum achievable braking torque and the minimum mass of the MRB is performed. After that, optimal results of the MRB are obtained and compared with those of MRBs in previous works. Based on optimal results of the MRB with a maximum achievable braking torque of 20 Nm, an MRB prototype is fabricated and experimentally investigated to validate the simulation results.
Influence of electric field, temperature, humidity, elastomer material, and encapsulation on the lifetime of dielectric elastomer actuators (DEAs) under DC actuation
Authors: Albuquerque Fabio Beco , Shea Herbert 
Published: October 2021

Abstract
We present the effect of electric field, temperature, humidity, type of elastomer material, and encapsulation on the lifetime of silicone-based dielectric elastomer actuators (DEAs) under DC electric fields. DEAs are promising soft actuators, but little has been reported on their reliability under static electric fields. We report that humidity and electric field are the dominant accelerating factors for device failure, and that a thin encapsulation layer can increase lifetime by more than an order of magnitude with negligible reduction in actuation strain. Our samples are expanding circle, single layer, prestretched films with 5 mm diameter compliant electrodes, operated at electric fields from 80 V µm−1 to 110 V µm−1, with actuation strains from 2% to 6%. We compare four different silicone elastomers, finding highest lifetime with Momentive Electro 242-1, five times higher than Elastosil 2030. Typical mean time to failure (MTTF) for Elastosil 2030 based DEAs at 100 V μm−1, 85 °C and 85% RH are 1.6 h, but this value increases to over 200 h at 20% RH. At 85 °C and 85% RH, the MTTF decreases by a factor of 62 when increasing the electric field from 80 V μm−1 (2.1% actuation strain) to 100 V μm−1 (4.6% actuation strain). Adding a thin, soft silicone encapsulation layer is an effective yet simple strategy to increase DEA lifetime, increasing the MTTF by factors from 2.2 to 75 under humid conditions. Extrapolating from our data, we predict that DC lifetimes above 1000 h can be achieved at fields below 70 V μm−1 (i.e. ≈1.5% strain) for Elastosil 2030/20 DEAs, and below 85 V μm−1 (i.e. ≈2.5% strain) for encapsulated DEAs at 85 °C—85% RH.
Dielectric and piezoelectric behavior of PVDF-modified 3-3 type cement-based piezoelectric composites
Authors: Liu Wei , Yin Jianneng , Wang Jianhong , Dong Yingge , Cheng Zhi , Bai Peikang 
Published: October 2021

Abstract
In this research, 3–3 type cement-based piezoelectric composites were prepared by casting Portland cement paste in porous lead zirconate titanate (PZT) ceramics, then the polyvinylidene fluoride (PVDF) of N-methylpyrrolidone solvent with concentration of 50–200 mg ml−1 was utilized to modify the lead zirconate titanate-Potland cement (PZT-PC) composites. The effects of PVDF concentration on the density, microstructure, dielectric, piezoelectric and electromechanical properties were studied. The results indicate that the density of PZT-PC composites increased gradually with PVDF concentration for the increasing combined weight of PVDF with the composites. The introduction of PVDF has also contributed to the reduction of leakage current during the poling and testing process, which led to increased relative permittivity ϵ
r and longitudinal piezoelectric strain coefficient d
33, while the dielectric loss tanδ and longitudinal piezoelectric voltage coefficient g
33 demonstrated an opposite changing trend. The thickness electromechanical coupling factor K
t of composites increased with the concentration of PVDF solution. The acoustic impedance (Z) of PVDF modified PZT-PC composites ranged from 6.89 to 7.65 MRayls, making it suitable for applications in the health monitoring of civil engineering.
On Mechanisms of Proton Perpendicular Heating in the Solar Wind: Test Results Based on Wind Observations
Authors: Zhao Guo-Qing , Feng Heng-Qiang , Wu De-Jin , Liu Qiang , Zhao Yan , Tian Zhan-Jun 
Published: October 2021

Abstract
The solar wind protons undergo significant perpendicular heating when they propagate in the interplanetary space. Stochastic heating and cyclotron resonance heating due to kinetic Alfvén waves (KAWs) are two proposed mechanisms. Which mechanism accounts for the perpendicular heating is still an open question. This paper performs tests for the two mechanisms based on Wind observations during 2004 June and 2019 May. Results show that heating rates in terms of stochastic heating theory considerably depend on the parameter of plasma β. For the solar wind with moderately high β, the theoretical heating rates are comparable to or larger than empirical heating rates, suggesting that the stochastic heating could be a powerful mechanism. For the solar wind with low β, on the contrary, the majority of data have theoretical heating rates much lower than empirical heating rates, showing that the stochastic heating seems to be weak in this case. On the other hand, it is found that, when the propagation angles of KAWs are around 70°, theoretically predicted damping wavenumbers of KAWs are equal to the observed wavenumbers at which magnetic energy spectra become significantly steep. This may imply that resonance heating due to cyclotron damping of KAWs could be another mechanism if KAWs have propagation angles around 70°.