bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparative evaluation of a family of isolated Ćuk DC/DC converter with step‐up techniques
Authors: Faistel Tiago Miguel Klein , Guisso Ronaldo Antonio , Andrade António Manuel Santos Spencer , da Silva Martins Mário Lúcio 
Published: September 2020

In this study, a comparative evaluation of a family of isolated Ćuk DC/DC converter with step‐up techniques is presented. The voltage gain techniques are the reduced redundant power processing and the voltage multiplier. In addition, a detailed comparative analysis of the converters is showed. This comparison comprises features, such as the principle of operation, voltage gain curves, voltage and current stresses, design methodology, and estimated losses. By these comparisons, the main features and constraints of the analysed converters are identified. Four 200 W prototypes were constructed and evaluated in the laboratory. The isolated Ćuk converter with voltage multiplier showed the best performance and a peak efficiency of 95.86%.
Self-generated ultraviolet radiation in molecular shock waves
Authors: Lehmann A. , Godard B. , Pineau des Forêts G. , Falgarone E. 
Published: September 2020

Context. Shocks are ubiquitous in the interstellar and intergalactic media, where their chemical and radiative signatures reveal the physical conditions in which they arise. Detailed astrochemical models of shocks at all velocities are necessary to understand the physics of many environments including protostellar outflows, supernova remnants, and galactic outflows.
Aims. We present an accurate treatment of the self-generated ultraviolet (UV) radiation in models of intermediate velocity (VS = 25–60 km s−1), stationary, weakly magnetised, J-type, molecular shocks. We show how these UV photons modify the structure and chemical properties of shocks and quantify how the initial mechanical energy is reprocessed into line emission.
Methods. We develop an iterative scheme to calculate the self-consistent UV radiation field produced by molecular shocks. The shock solutions computed with the Paris–Durham shock code are post-processed using a multi-level accelerated Λ-iteration radiative transfer algorithm to compute Lyman α, Lyman β, and two-photon continuum emission. The subsequent impacts of these photons on the ionisation and dissociation of key atomic and molecular species as well as on the heating by the photoelectric effect are calculated by taking the wavelength dependent interaction cross-sections and the fluid velocity profile into account. This leads to an accurate description of the propagation of photons and the thermochemical properties of the gas in both the postshock region and in the material ahead of the shock called the radiative precursor. With this new treatment, we analyse a grid of shock models with velocities in the range VS = 25–60 km s−1, propagating in dense (nH ≥ 104 cm−3) and shielded gas.
Results. Self-absorption traps Lyα photons in a small region in the shock, though a large fraction of this emission escapes by scattering into the line wings. We find a critical velocity VS ~ 30 km s−1 above which shocks generate Lyα emission with a photon flux exceeding the flux of the standard interstellar radiation field. The escaping photons generate a warm slab of gas (T ~ 100 K) ahead of the shock front as well as pre-ionising C and S. Intermediate velocity molecular shocks are traced by bright emission of many atomic fine structure (e.g. O and S) and metastable (e.g. O and C) lines, substantive molecular emission (e.g. H2, OH, and CO), enhanced column densities of several species including CH+ and HCO+, as well as a severe destruction of H2O. As much as 13–21% of the initial kinetic energy of the shock escapes in Lyα and Lyβ photons if the dust opacity in the radiative precursor allows it.
Conclusions. A rich molecular emission is produced by interstellar shocks regardless of the input mechanical energy. Atomic and molecular lines reprocess the quasi totality of the kinetic energy, allowing for the connection of observable emission to the driving source for that emission.
Investigation of geomechanical parameters of rock mass condition of Magnezitovaya mine**
Authors: Krinitsyn Roman , Sentyabov Sergey 
Published: September 2020

Mining is a sphere of human activity connected with extraction of minerals from Earth’s interior in conditions of alternating change of the sizes of Earth accompanied by change of the stress-deformed state (SDS) of the rock mass, resulting in sudden destructions of rock structures and earthquakes, with considerable human victims.The results of long-term geodeformation monitoring of natural stresses at Ural mines conducted by the Laboratory of geodynamics and mining pressure of the Ural Branch of Russian Academy of Sciences over the past 20 years have allowed us to offer new, more modern structure of the natural stress field with a reference to their changes in time. The Laboratory of geodynamics and mining pressure of the Institute of Geodynamics of the Ural Branch of Russian Academy of Sciences has created the geodeformation field test site at the Magnezitovaya mine [1] This field test site allows to quickly track the changes in the stress state by deformation methods and to react in time to the changes in the stress state of the rock mass. And by applying the measures to control the state of the rock mass, the company’s personnel ensure the safety of room work at the deposit. This allows to minimize the occurrence of the rock pressure in static and dynamic forms, and thus to ensure the safety of people working in underground conditions.
Study of the prospects for expanding the range of collectors in the flotation of fluorite from technogenic raw materials
Authors: Voronova Olga , Kiyenko Lidia 
Published: September 2020

The results of studies on the development of a technology for the extraction of fluorite concentrates from finely disseminated refractory technogenic raw materials from Primorsky deposits were presented. The account of the technological features of the stale tailings of the concentration plant of Yaroslavkaya Mining Company has been given. The necessity of fine grinding of the material and careful selection of reagent compositions providing the required flotation selectivity has been substantiated. The fundamental possibility of obtaining fluorite concentrates containing CaF2 up to 94% and more using several samples of collectors from the group of fatty acids has been established. Fatty acids of tall oil produced by Ust-Ilimsk timber processing complex and a mixture of fatty acids produced in India, branded MASOIL 1880, provide a sufficient level of flotation selectivity. The recovery of fluorite in an open enrichment cycle according to the scheme with seven cleanings of the foam product can be 61.85-63.84%.
The use of collectors compositions promotes an increase in the selectivity of the adsorption of reagents, which is accompanied by an increase in the selectivity of their action in comparison with the results obtained with the dosage of certain brands of the tested reagents into the flotation process. The extraction of fluorite into a concentrate obtained using a combination of tall oil and MASOIL-S fatty acids in a 1:1 ratio was 59.55-66.27% with a content of 95.6-94.23% CaF2 in it, respectively.
Fission fragments observables measured at the LOHENGRIN spectrometer
Authors: Julien-Laferrière S. , Thombansen L. , Kessedjian G. , Chebboubi A. , Serot O. , Sage C. , Méplan O. , Ramdhane M. , Litaize O. , Nicholson J. , Bernard D. , Köster U. , Mutti P. , Materna T. , Rapala M. 
Published: September 2020

Nuclear fission yields are key data for reactor studies, such as spent fuel inventory or decay heat, and for understanding fission process. Despite a significant effort allocated to measure fission yields during the last decades, the recent evaluated libraries still need improvements in particular in the reduction of the uncertainties. Moreover, some discrepancies between these libraries must be explained.
Additional measurements provide complementary information and estimations of experimental correlations, and new kinds of measurements enable to test the models used during the nuclear data evaluation process. A common effort by the CEA, the LPSC and the ILL aims at tackling these issues by providing precise measurements of isotopic and isobaric fission yields with the related variance-covariance matrices. Additionally, the experimental program involves a large range of observables requested by the evaluations, such as kinetic energy dependency of isotopic yields and odd-even effect in order to test the sharing of total excitation energy and the spin generation mechanism. Another example is the complete range of isotopic distribution per mass that allows the determination of the charge polarization, which has to be consistent for complementary masses (pre-neutron emission). For instance, this information is the key observable for the evaluation of isotopic yields. Finally, ionic charge distributions are indirect measurements of nanosecond isomeric ratios as a probe of the nuclear de-excitation path in the (E*, J, π) representation.
Measurements for thermal neutron induced fission of 241 Pu have been carried out at the ILL in Grenoble, using the LOHENGRIN mass spectrometer. Methods, results and comparison to models calculations will be presented corresponding to a status on fission fragments observables reachable with this facility.
A Case of Zenker’s Diverticulum in a Patient with Tight Esophageal Peptic Stricture
Authors: Alkhormi Abdulrahman M. , Memon Muhammad Y. 
Published: September 2020

AbstractZenker’s diverticulum (ZD) is a posterior Sac like outpouching of the hypopharyngeal mucosa and submucosa through Killian’s triangle, which is an area of muscular weakness between the transverse fibers of the cricopharyngeus muscle and the oblique fibers of the lower inferior constrictor muscle. ZD usually presents with swallowing difficulties, regurgitation of undigested food, choking, halitosis, weight loss, and respiratory symptoms due to chronic aspiration. Several esophageal pathologies have been reported in association with ZD. These include cervical esophageal webs, upper esophageal stenosis, and hiatus hernia. Herein, we report a case of ZD in association with severe gastroesophageal reflux disease and tight lower esophageal peptic stricture.
OxymaPure Coupling Reagents: Beyond Solid-Phase Peptide Synthesis
Authors: El-Faham Ayman , Albericio Fernando , Manne Srinivasa Rao , de la Torre Beatriz G. 
Published: September 2020

AbstractOxymaPure [ethyl 2-cyano-2-(hydroxyimino)acetate] is an exceptional reagent with which to suppress racemization and enhance coupling efficiency during amide bond formation. The tremendous popularity of OxymaPure has led to the development of several Oxyma-based reagents. OxymaPure and its derived reagents are widely used in solid- and solution-phase peptide chemistry. This review summarizes the recent developments and applications of OxymaPure and Oxyma-based reagents in peptide chemistry, in particular in solution-phase chemistry. Moreover, the side reaction associated with OxymaPure is also discussed.1 Introduction2 Oxyma-Based Coupling Reagents2.1 Aminium/Uronium Salts of OxymaPure2.2 Phosphonium Salts of OxymaPure2.3 Oxyma-Based Phosphates2.4 Sulfonate Esters of OxymaPure2.5 Benzoate Esters of OxymaPure2.6 Carbonates of OxymaPure Derivatives3 OxymaPure Derivatives4 Other Oxime-Based Additives and Coupling Reagents5 Side Reactions Using OxymaPure Derivatives6 Conclusion7 List of Abbreviations
Phosphorylation of Carboxylic Acids and Their Derivatives with P(O)–H Compounds Forming P(O)–C Bonds
Authors: Chen Tieqiao , Han Li-Biao , Tan Qihang , Liu Xue , Liu Long , Huang Tianzeng 
Published: September 2020

AbstractHerein, we highlight advances in the phosphorylation of readily available carboxylic acids and their derivatives forming synthetically important P(O)–sp3C, P(O)–sp2C, and P(O)–spC bonds, with an emphasis on the results demonstrated since 2010. This review examines the challenges associated with the use of this strategy for the synthesis of organophosphorus compounds and details advances in the design of catalytic systems that suppress these problems thus resulting in notable progress. Mechanistic details are discussed where available.1	Introduction2	Formation of P(O)–sp3C Bonds3	Formation of P(O)–sp2C Bonds4	Formation of P(O)–spC Bonds5	Outlook and Conclusion
Avaliação pós-operatória comparativa dos pacientes submetidos ao tratamento cirúrgico das luxações acromioclaviculares aguda versus crônica
Authors: Storti Thiago Medeiros , de Paula Leony Batista , Simionatto Carolina , Simionatto João Eduardo , Faria Rafael Salomon Silva , Paniago Alexandre Firmino 
Published: September 2020

Resumo
Objetivos Avaliar e comparar os resultados do tratamento cirúrgico das luxações acromioclaviculares (LACs) aguda e crônica, definindo o plano terapêutico mais eficaz.
Métodos Estudo retrospectivo realizado com 30 pacientes operados entre 2011 e 2018 para LAC tipos III e V, separados de acordo com a classificação temporal em subgrupo agudo (< 3 semanas; subgrupo I) e subgrupo crônico (> 3 semanas; subgrupo II). Todos os pacientes foram submetidos a avaliação pós-cirúrgica com protocolo padronizado composto por dados epidemiológicos, funcionais e radiográficos.
Resultados No subgrupo I, a pontuação na escala visual analógica (EVA) foi de 1,10, o escore de Constant-Murley foi de 92,3, e o escore da University of California at Los Angeles (UCLA) foi de 33,5. A distância coracoclavicular (CC) foi de 11,0 mm, e o aumento do espaço CC foi em média menor do que 8,9% em relação ao ombro contralateral. No subgrupo II, a EVA foi de 1,11, o escore de Constant-Murley foi de 94,2, e o da UCLA, 32,4. A distância CC foi de 13,8 mm, sendo o aumento do espaço CC de 22,9% em relação ao contralateral.
Conclusão Apesar de não ter havido diferença significativa entre os quesitos avaliados, houve uma tendência de o subgrupo agudo apresentar distância CC (p = 0,098) e percentual de aumento da distância CC (p = 0,095) menor do que o subgrupo crônico. Assim, é interessante que o tratamento cirúrgico seja realizado nas primeiras três semanas após o trauma, para tentar evitar essa tendência. Nos casos em que não for possível realizar o tratamento na fase aguda, a técnica de Weaver Dunn modificada apresenta bons resultados clínicos e funcionais.
O impacto das fraturas do quadril no SUS 2008 - 2017: O papel do ortopedista
Authors: Stolnicki Bernardo , Teixeira Bruno Casaes 
Published: September 2020

Abstract
Objective The present study intends to describe the profile of hospitalization and ambulatory rehabilitation of patients ≥ 50 years old due to hip fracture in the Brazilian Public Health System (SUS, in the Portuguese acronym).
Methods This is a cross-sectional study of patients hospitalized due to hip fracture in the SUS between 2008 and 2017. Data included 441,787 hip fracture-related hospitalizations from the hospitalization database of the department of informatics of the Brazilian Unified Health System (SIH/DATASUS, in the Portuguese acronym), and data of patients who underwent rehabilitation from the ambulatory database of the department of informatics of the Brazilian Unified Health System (SIA/DATASUS, in the Portuguese acronym.).
Results Most of hip fracture-related hospitalizations (83.5%) happen to people ≥ 50 years old, with an average annual growth of 5.6% in hip fracture-related hospitalizations. The costs for the government have been growing in the same proportion and reached almost BRL 130 million in 2017, although with a 13.6% decrease in average cost per hospitalization. Besides the financial impact, hip fractures result in an in-hospital mortality rate around 5.0% in patients aged ≥ 50 years old. In addition, the percentage of patients that have undergone hip fracture-related rehabilitation increased from 2008 (14.0%) to 2012 (40.0%), and remained stable after that.
Conclusions The progressive increase in the incidence of hip fractures shows the financial and social impact, and the need for immediate actions to prevent this rising trend. Hip fractures are a risk for secondary fractures, the prevention is crucial, and the orthopedist plays a central role in this process.
Evaluation of Oxidative-Stress Pathway and Recovery of Sudden Sensorineural Hearing Loss
Authors: Elias Thaís Gomes Abrahão , Monsanto Rafael da Costa , do Amaral Jonatas Bussador , Oyama Lila Missae , Maza Paloma Korehisa , Penido Norma de Oliveira 
Published: September 2020

AbstractIntroduction Although the pathogenesis of sudden sensorineural hearing loss (SSNHL) has been discussed in the literature, many unclear points remain. Several authors have hypothesized that oxidative stress plays a role in the pathogenesis of noise-related hearing loss, as well as in drug- and aging-related hearing loss. Reactive oxygen species (ROS) may contribute to the pathogenesis of SSNHL in a similar way as in cases of ototoxicity, noise-induced hearing loss and presbyacusis.Objective The aim of the present study was to find potential peripheral biomarkers to show the levels of oxidative stress in samples of peripheral blood collected from SSNHL patients with and withouth metabolic disease.Methods In total, 80 consecutive patients with SSNHL were evaluated in the otolaryngology emergency room and outpatient clinic of a tertiary hospital between May 2017 and May 2019. All patients underwent detailed anamnesis, physical examination, audiometry, magnetic resonance imaging (MRI) of the inner ears, and blood tests for serum lipids and plasma activity of thiobarbituric acid reactive species (TBARS).Results No significant effect of malondialdehyde (MDA) activity was observed regarding the hearing recovery of patients who developed SSNHL.Conclusion We did not observe a significant correlation between the concentration of TBARs in the peripheral blood or the presence of arterial hypertension and the severity of the initial hearing loss or the prognosis of hearing recovery in patients with SSNHL. The concentration of TBARs in the peripheral blood may not adequately represent the abnormalities that occur in the intracoclear environment.
Cisto aracnóide após trauma na coluna torácica com compressão medular: Relato de caso
Authors: Zanon Igor de Barcellos , Kanas Michel , Joaquim Marcos Augusto Stávale , Martins Délio Eulálio , Wajchenberg Marcelo , Astur Nelson 
Published: September 2020

ResumoCistos aracnóides são raros, podem ocorrer em todos os níveis do saco dural, e sua origem pode ser congênita, traumática, iatrogênica ou inflamatória. Neste artigo, relatamos o caso de uma paciente com mielopatia torácica compressiva decorrente de um cisto aracnóide intradural incomum, de manifestação pós-traumática, assim como sua resolução, além de realizar revisão da literatura sobre o tema. A principal localização é na coluna torácica, seguida das colunas lombar, lombossacra e toracolombar. O cisto com origem traumática é causado por lesão da camada interna da dura-máter. Essas lesões produzem déficit neurológico por meio de efeito de massa sobre a medula espinhal. A existência de mielopatia compressiva associada é mais rara ainda. A ressecção ou drenagem dos cistos na vigência de mielopatia deve ser imediata, sendo o tratamento de escolha. Apesar de raros, podem ser uma complicação de fraturas da coluna vertebral que são muito comuns na prática de ortopedistas e neurocirurgiões, que devem estar preparados para essa situação incomum.
Avaliação da tenotomia ou tenodese bicipital na infiltração gordurosa do músculo bíceps
Authors: Simmer Filho Jair , Lara Paulo Henrique Schmidt , Leite Júnior Juarez , Belangero Paulo Santoro , Ejnisman Benno 
Published: September 2020

Resumo
Objetivo O objetivo do presente estudo foi determinar a existência de infiltração gordurosa (IG) na massa muscular do bíceps braquial após a tenotomia ou tenodese para tratamento de lesão no tendão da cabeça longa do bíceps e estabelecer uma relação entre a IG e alterações no comprimento das fibras musculares.
Métodos Análise clínica e de imagens de 2 grupos de pacientes (submetidos à tenodese do bíceps [16 indivíduos] ou tenotomia do bíceps [15 indivíduos]). Nos dois grupos, os achados foram comparados àqueles do lado contralateral de cada indivíduo (grupo controle). Todos os pacientes foram submetidos à tenodese ou tenotomia unilateral do bíceps, com acompanhamento pós-operatório > 1 ano. Exames de ressonância magnética (RM) foram realizados em ambos os braços de cada paciente de acordo com um protocolo específico. A força de flexão do cotovelo foi medida com dinamômetro manual e os resultados foram submetidos à análise estatística.
Resultados O período pós-operatório médio antes da realização da RM foi de 5 anos, e nenhum caso de IG foi observado no compartimento anterior de ambos os braços dos pacientes avaliados. Sete pacientes apresentaram deformidade moderada ou grave no braço operado. Não houve relação significativa entre deformidade do braço (p = 0,077), percentual de força de flexão (p = 0,07) ou dor à palpação do sulco bicipital (p = 0,103).
Conclusão Nenhum dos pacientes avaliados apresentou evidência de IG na massa muscular do compartimento anterior do braço após os procedimentos. Não foi possível estabelecer uma correlação entre a discrepância do comprimento do músculo bíceps, medido à RM, e a presença de IG no compartimento anterior do braço.
Improvement of quality and stability of MAPbI3 films grown by post annealing under high pressure argon atmosphere
Authors: Jiang Junjie , Tang Wenchao , Yang Xingming , Sun Xiaofan , Yang Jincheng , Cai H L , Zhang F M , Wu X S 
Published: September 2020

Abstract
Organic-inorganic hybrid perovskite MAPbI3 films with large grain size and excellent photoelectric properties are obtained by annealing the precursors at Ar atmosphere with pressure up to 10 MPa. In comparing to the film annealing at Ar with 0.1 MPa, 4 times lager grains are observed with the film annealing at the Ar atmosphere with the pressure of 6 MPa. The structural stability in respect to temperature is confirmed by the temperature dependence of x-ray diffraction. The band gap of MAPbI3 films may be adjusted by varying the annealing pressure. There is one order of magnitude in intensity of photoluminescence (PL) due to annealing at the Ar atmosphere with high pressure, even the intensity of PL increases with increasing the temperature up to 35 °C. Post annealing with high atmosphere pressure may be a new method in fabricating high performance MAPbI3 films.
Variance reduction for effective energies of random lattices in the Thomas–Fermi–von Weizsäcker model
Authors: Fischer Julian , Kniely Michael 
Published: September 2020

Abstract
In the computation of the material properties of random alloys, the method of ‘special quasirandom structures’ attempts to approximate the properties of the alloy on a finite volume with higher accuracy by replicating certain statistics of the random atomic lattice in the finite volume as accurately as possible. In the present work, we provide a rigorous justification for a variant of this method in the framework of the Thomas–Fermi–von Weizsäcker (TFW) model. Our approach is based on a recent analysis of a related variance reduction method in stochastic homogenization of linear elliptic PDEs and the locality properties of the TFW model. Concerning the latter, we extend an exponential locality result by Nazar and Ortner to include point charges, a result that may be of independent interest.