bluuebunny/crossref_metadata_2025_split huggingface dataset:
Benchmarking of long-read assemblers for prokaryote whole genome sequencing
Authors: Wick Ryan R. , Holt Kathryn E. 
Published: December 2019

Background: Data sets from long-read sequencing platforms (Oxford Nanopore Technologies and Pacific Biosciences) allow for most prokaryote genomes to be completely assembled – one contig per chromosome or plasmid. However, the high per-read error rate of long-read sequencing necessitates different approaches to assembly than those used for short-read sequencing. Multiple assembly tools (assemblers) exist, which use a variety of algorithms for long-read assembly. Methods: We used 500 simulated read sets and 120 real read sets to assess the performance of six long-read assemblers (Canu, Flye, Miniasm/Minipolish, Raven, Redbean and Shasta) across a wide variety of genomes and read parameters. Assemblies were assessed on their structural accuracy/completeness, sequence identity, contig circularisation and computational resources used. Results: Canu v1.9 produced moderately reliable assemblies but had the longest runtimes of all assemblers tested. Flye v2.6 was more reliable and did particularly well with plasmid assembly. Miniasm/Minipolish v0.3 was the only assembler which consistently produced clean contig circularisation. Raven v0.0.5 was the most reliable for chromosome assembly, though it did not perform well on small plasmids and had circularisation issues. Redbean v2.5 and Shasta v0.3.0 were computationally efficient but more likely to produce incomplete assemblies. Conclusions: Of the assemblers tested, Flye, Miniasm/Minipolish and Raven performed best overall. However, no single tool performed well on all metrics, highlighting the need for continued development on long-read assembly algorithms.
Siete errores comunes en el diagnóstico, manejo y tratamiento de heridas crónicas
Authors: Vallejo Leticia 
Published: December 2019

Sinopsis: En los últimos 40 años, se han logrado importantes avances para mejorar la práctica, el manejo y el cuidado de heridas crónicas. Sin embargo, los costos para tratar estas heridas continúan superando los miles de millones de dólares anuales en el mundo y afectando la calidad de vida del paciente que las padece. El proceso de cicatrización de heridas crónicas implica factores complejos que la mayoría de los profesionales de la salud desconoce, y que varían según cada paciente. Teniendo en cuenta estos puntos y la literatura disponible, la autora presenta siete errores comunes en el diagnóstico, manejo y tratamiento avanzado de heridas crónicas basados en 20 años de experiencia, que podrían ayudar a establecer un cuidado uniforme, de calidad e integrado en los diferentes países de América latina.
Steady-state frequency-tracking distortion in the digital Pound–Drever–Hall technique
Authors: Wang Xiao , Feng Lishuang , Xu Jun , Ni Peiren 
Published: December 2019

We present here a general method for evaluating the steady-state frequency-tracking distortion in the digital Pound–Drever–Hall technique with modulation harmonic distortion. The theoretical tracking distortion model is established based on the multi-beam interference theory. The effects of the additional harmonic phase shift and the relative distortion ratio changes in the model are simulated by the Runge–Kutta method. Moreover, we demonstrate the steady-state frequency-tracking distortion caused by the modulation harmonic distortion in a resonant frequency tracking system with a 35 mm

S
i

3

N

4

waveguide ring resonator. According to the measured and simulated results, we obtain the optimal modulation frequency and depth with minimal frequency-tracking distortion, which are 11.49 MHz and 3.96, respectively.
Realization of a compact cross-grating spectrometer and validating experimental tests
Authors: Kraus Matthias , Förster Erik , Bagusat Verena , Hönle Tobias , Uwurukundo Xavier , Bohnert Patrick , Brüning Robert , Hillmer Hartmut , Brunner Robert 
Published: December 2019

Echelle inspired cross-grating spectrometers offer the potential to
bridge the gap between classical high-end echelle spectrometers and
curved-grating single-element instruments. In particular, the
cross-grating approach offers the possibility to simultaneously
achieve a high spectral resolution and a wide accessible spectral
range in compact dimensions and without moving parts. We report on the
complete realization and implementation details of an all-reflective
cross-grating spectrometer based on a modified Czerny–Turner
configuration including a folded beam path and a toric-convex mirror
for aberration compensation. The applicability of the cross-grating
spectrometer is demonstrated by test measurements including the
recording of the spectra of different plant leaves. For the
cross-grating spectrometer, with an accessible wavelength range
between 330 and 1100 nm, a spectral resolution of 0.6 nm at 589 nm was
achieved.
Cross-correlation registration algorithm enhancements for multipixel inverse synthetic aperture LiDAR
Authors: Hennen John A. , Dierking Matthew P. 
Published: December 2019

The accurate registration and realignment of complex signal volumes is critical for cross-range aperture gain in 3D LiDAR aperture synthesis. For targets at long range, only a limited number of diffraction-limited pixels will be projected on the target, resulting in low cross-range support. In addition, the signal-to-noise ratio (SNR) is typically low. This research describes an enhanced cross-correlation registration algorithm for 3D inverse synthetic aperture LiDAR data volumes that improves performance for low cross-range support, low SNRs, and relatively large aperture shifts. The registration performance is improved through statistical removal of the cross-correlation noise pedestal and compensation for the reduced signal overlap caused by larger shifts. The registration performance is characterized as a function of SNR, signal shift (target rotation rate), and target pixel support. The algorithm’s improvements allow for registration convergence at 1–5 dB lower SNR than the baseline cross-correlation algorithm. In addition, the algorithm enhancements allow for registration convergence at 10%–20% greater shifts.
Discretized superimposed optical fiber long-period gratings
Authors: Trono Cosimo , Valeri Federico , Baldini Francesco 
Published: December 2019

A novel technique, to the best of our knowledge, for the inscription of superimposed long-period gratings with arbitrary grating pitches is proposed and experimentally validated. The technique is based on the discretization of an ideal continuous sinusoidal refractive index (RI) pattern with a step function. The RI variation is induced by means of the irradiation of a photosensitive fiber with a 248 nm UV laser beam. The nonlinear relation between the induced RI change and the UV fluence was experimentally derived. Two superimposed long-period grating (LPGs) with different grating pitches have been realized with the discretization technique; the transmission spectrum was compared with that of two superimposed LPGs obtained with the traditional square wave RI modulation. The validity of the proposed technique was demonstrated by the better spectral characteristics of the discretized superimposed LPGs.
Primary antibody deficiency associated with ring chromosome 18
Authors: Yeganeh Mehdi , Basha Tallal , Abdrabo Lina Sobhi , Wang Sophie Ran , Lafond-Lapalme Joël , Rivière Jean-Baptiste , Lejtenyi Duncan , Rosenblatt David S. , McCusker Christine , Alizadehfar Reza , Mazer Bruce D. 
Published: December 2019

Background: Patients with chromosome 18 abnormalities can present with an immune phenotype that resembles common variable immunodeficiency. Knowledge of the genes underlying the immune defects related to chromosome 18 aberrations could improve our understanding of the molecular basis of primary antibody deficiencies. Here we present a patient with ring chromosome 18 affected by primary antibody deficiency and autoimmunity.Methods: Lymphocyte populations were determined by flow cytometry. Specific antibody response to protein vaccines and pneumococcal capsule antigen were measured by ELISA. Genome sequencing was performed using a PCR-free protocol.Case: The patient was diagnosed with ring chromosome 18 for delayed growth and dysmorphic features at the age of 1 month. Array comparative genomic hybridization showed deletions of 18p11.21-pter and 18q21.31-qter. At the age of 10 months, she started having recurrent episodes of otitis media and pneumonia, as well as autoimmune arthritis. Serum immunoglobulins and specific antibody levels were low. The CD19+CD27+ memory B cell and CD45RO+ T cell populations were decreased. Recurrent infections were controlled with parenteral immunoglobulin and autoimmune arthritis was treated with systemic and intra-articular therapies.Conclusions: Selective IgA deficiency is the most common form of immunodeficiency associated with chromosome 18 abnormalities, however patients with ring chromosome 18 may also be affected by specific antibody deficiency and require immunoglobulin replacement for optimal care. These patients might partially share the same genomic loss as in patients with non-syndromic primary antibody deficiency.Statement of novelty: This report highlights an important teaching point about immune deficiency in a chromosomal anomaly that is not infrequently encountered in pediatric hospitals. Furthermore, our investigations provide more insight into the pathogenesis of immunodeficiency among patients with chromosome 18 abnormalities.
Mental Imagery in Volleyball Settings: A Scoping Review
Authors: Ribeiro Joana , Dias Cláudia , Filho Valter Cardoso Barbosa , Cruz José , Fonseca António 
Published: December 2019

Abstract
This article presents a scoping review of the published literature on mental imagery in the context of volleyball. Four online databases and one peer-reviewed journals were searched, based on the inclusion criteria. Publication information, procedures and research methods, sample characteristics, sport type and type of mental imagery were analyzed. The selection process found 52 studies, and results showed that from 1987 to 2018 the mental images, along with other psychological skills, have gained popularity in volleyball settings. The examined studies used cross-sectional and experimental approaches, and the analysis was assessed by quantitative data and/ or mental imagery training programs (with relaxation and scripts), mainly focusing on the isolated analysis of the mental imagery construct, and evaluating its use. The studies included both male and female participants, but only 11% were volleyball players. Additionally, the focus was on adolescents and young adult athletes, mostly from high school/ university or international/ elite levels. However, just two studies examined athletes under the age of 16. Considering the present study’s results, limitations, and its implications for practice (e. g. to provide the coach certification programs with specific mental imagery contents), future research directions were highlighted, such as improve mental imagery training programs for children and youth volleyball players.
Crystal structure of (E)-1-{4-[(4-fluoro-2-hydroxybenzylidene)amino]phenyl}ethanone O-methyl oxime, C16H15FN2O2
Authors: Fu Tao , Ma Jin-Xia , Li Qing-Lin , Wei Ping , Zhao Ji-Xing , Zhao Li 
Published: December 2019

Abstract
C16H15FN2O2, monoclinic, P21/c (no. 14), a = 6.0573(3) Å, b = 13.8341(6) Å, c = 33.0876(15) Å, β = 92.837(2)°, Z = 8, V = 2769.3(2) Å3, R
gt(F) = 0.0581, wR
ref(F
2) = 0.1605, T = 173(2) K.
Role of parabolic viscosity in numerical analysis of derivative nonlinear evolution equations
Authors: Meškauskas Tadas , Ivanauskas Feliksas 
Published: December 2019

We consider the difference schemes applied to a derivative nonlinear system of evolution equations. For the boundary-value problem with initial conditions
∂u/∂t = A ∂2u/∂x2 + B ∂u/∂x + f(x,u) + g(x,u) ∂u/∂x, (t,x) ∈ (0, T] x (0, 1),u(t,0) = u(t,1) = 0, t ∈ [0, T],u(0,x) = u(0)(x), x ∈ (0, 1)
we use the Crank-Nicolson discretization. A is complex and B – real diagonal matrixes; u, f and g are complex vector-functions. The analysis shows that proposed schemes are uniquely solvable, convergent and stable in a grid norm W22 if all (diagonal) elements in Re(A) are positive. This is true without any restriction on the ratio of time and space grid steps.
Dynamics of the processes in metal machining
Authors: Švitra Donatas , Janutėnienė Jolanta 
Published: December 2019

In the practice of processing of metals by cutting it is necessary to overcome the vibration of the cutting tool, the processed detail and units of the machine tool. These vibrations in many cases are an obstacle to increase the productivity and quality of treatment of details on metal-cutting machine tools. Vibration at cutting of metals is a very diverse phenomenon due to both it’s nature and the form of oscillatory motion.
The most general classification of vibrations at cutting is a division them into forced vibration and autovibrations. The most difficult to remove and poorly investigated are the autovibrations, i.e. vibrations arising at the absence of external periodic forces. The autovibrations, stipulated by the process of cutting on metalcutting machine are of two types: the low-frequency autovibrations and high-frequency autovibrations. When the low-frequency autovibration there appear, the cutting process ought to be terminated and the cause of the vibrations eliminated. Otherwise, there is a danger of a break of both machine and tool. In the case of high-frequency vibration the machine operates apparently quiently, but the processed surface feature small-sized roughness. The frequency of autovibrations can reach 5000 Hz and more.
Autocognición sobre civismo y ciudadanía, de estudiantes de pedagogía en Historia, Geografía y Educación Cívica en una universidad chilena
Authors: Sáez Geoffroy Andrés , Parra-Díaz Joel , Herrera Gómez Fernando 
Published: December 2019

Esta investigación surge por la necesidad de conocer cómo el profesorado en formación de Pedagogía en Historia, Geografía y Educación Cívica de una universidad chilena concibe elementos de civismo y ciudadanía. El objetivo de este artículo es identificar las relaciones entre la autocognición sobre civismo y ciudadanía, y el desempeño académico del profesorado en formación. Se analizan los resultados de acuerdo con el avance curricular de los sujetos de estudio, con la finalidad de identificar si el currículum incide en el desarrollo de estas competencias cívicas. La investigación se realizó durante el año 2018 bajo un enfoque cuantitativo, de corte transversal, con un diseño descriptivo y correlacional. La muestra fue de 129 sujetos y se utilizó un muestreo probabilístico estratificado. Se utilizó la escala del Estudio internacional de educación cívica y formación ciudadana del año 2009. Los resultados muestran que existe una correlación entre los puntajes en las tres categorías de la dimensión estudiada y el Promedio General Acumulado (PGA) de quienes participaron. A la vez, son inexistentes las diferencias según el avance curricular. De esta manera, se puede establecer una relación entre el desarrollo de la autocognición ciudadana y el rendimiento académico, aunque el currículum de esta carrera no favorecería el desarrollo de estas competencias. Dada la particularidad del curriculum de la carrera cursada por quienes participaron, los resultados no podrían ser generalizables. No obstante, este es un estudio de una temática poco abordada, lo que permite establecer una base sobre la cual se pueden realizar otros trabajos.
Трехпараметрическая модель межмолекулярных взаимодействий как основа для классификации и выбора неподвижных фаз для газовой хроматографии
Authors: Zaitceva Elena A. , Dolgonosov Anatoly M. 
Published: December 2019

Описан метод трехпараметрической характеристики селективности газохроматографических неподвижных фаз, который базируется на представлении энергии межмолекулярного взаимодействия вкладами неполярных, полярных сил и водородных связей. Все параметры, используемые в математических выражениях, имеют физический смысл, переносимы и не требуют проведения дополнительных экспериментов. Характеристики неподвижных фаз могут быть рассчитаны как из экспериментальных данных по хроматографическому удерживанию, так и a priori, по известной структурной формуле фазы. Описаны оба способа и проведен расчет параметров для ряда веществ. Полученные разными способами характеристики селективности неподвижных фаз согласуются между собой. Рассматривается также основанная на трехпараметрической модели концепция выбора неподвижной фазы для разделения близких веществ.
Оценка межмолекулярных взаимодействий трифенильных производных элементов пятой группы Периодической системы методом газо-жидкостной хроматографии
Authors: Taneeva Alina V. , Novikov Vyacheslav F. , Dmitrieva Alexandra V. , Wu Ngok Zan , Nguyen Zuy Hung 
Published: December 2019

Методом газо-жидкостной хроматографии изучили характер межмолекулярного взаимодействия трифенильных производных элементов пятой группы Периодической системы с органическими веществами различной физико-химической природы. Определены хроматографические факторы полярности Роршнайдера изученных рядов соединений, проведена оценка вклада в межмолекулярное взаимодействие полярных сорбатов на основе трехмерной модели и определены термодинамические функции сорбента. Показано влияние центрального атома молекулы трифенильных производных на их сорбционные свойства.
Углеродные адсорбенты на базе растительных отходов Мьянмы как средства очистки производственных выбросов и сбросов
Authors: Naing Lin Soe , Moe Zin , Thu Min , Thu Myat Min , Myint Saw Win , Nistratov Alexey V. , Klushin Vitaly N. 
Published: December 2019

Представлены основы технологии переработки фрагментов крупнотоннажных растительных отходов предприятий Мьянмы в виде скорлупы орехов кокоса и косточек сливы, древесины бирманского железного дерева, оболочек семян манго, рисовой шелухи и гуза-паи – полевых остатков возделывания хлопчатника на активные угли методом их пиролиза и активации карбонизатов водяным паром. Охарактеризованы технические показатели полученных в оптимальных условиях целевых продуктов и сопоставительные результаты эффективности их использования при очистке сточных вод игазовых выбросов.
Аналитическая модель случайного распределения объектов двух сортов на двумерной плоскости с гексагональной структурой
Authors: Prudkovskii Andrei G. 
Published: December 2019

Данная работа посвящена исследованию равновесных состояний абстрактных двухфазных систем с учётом симметрий на примере сорбции объектов двух сортов на гексагональную плоскость. В первом приближении подобные процессы управляются некоторым коэффициентом распределения, который легко может быть измерен на опыте. Однако определение вероятности образования при этом конгломератов однотипных объектов так просто определить невозможно. В данной работе приведено точное решение данной вероятностной задачи, а также обсуждены вопросы нарушения законов статистики, которые могут происходить в результате взаимодействия сорбируемых объектов.Предложенная методика построения формул легко может быть обобщена на иные симметричные структуры, отличные от гексагональных, а также на иную структуру центров сорбции, отличных от плоскости. Результаты работы могут быть применены для исследования реакций обмена в задачах адсорбции и химического равновесия при наличии тех или иных симметрий в сочетании с вероятностным распределением.
Монолитные сорбенты с ковалентно связанной матрицей для тонкослойной хроматографии в сочетании с масс-спектрометриейс матрично- активированной лазерной десорбцией/ионизацией
Authors: Kucherenko Elizaveta V. , Kanateva Anastasiia Yu. , Kurganov Alexander A. , Borisov Roman S. , Pirogov Andrey V. 
Published: December 2019

Показана возможность создания монолитных пластин, содержащих в своей структуре функциональные группы, способные выполнять роль МАЛДИ матриц, продемонстрированы первые результаты по десорбции/ионизации соединений с массами порядка 400 Да. Приготовлены монолитные пластины на основе (со)полимеров глицидилметакрилата и этиленгликоля диметакрилата с содержанием первого от 0 до 29% и стирола и дивинилбензола с содержанием стирола от 0 до 35%. Наилучшие результаты удалось получить для пластин с содержанием глицидилметакрилата от 19 до 29 % и с содержанием стирола 5-20%. Отмечено, что отсутствие монофункционального мономера в полимеризационной смеси приводит к подавлению ионизации аналитов и невозможности использования таких пластин в режиме МАЛДИ-МС. Предложенный в работе метод получения МАЛДИ-МС-ТСХ спектров позволяет исключить один из наиболее трудоемких этапов процесса, связанный с приготовлением и нанесением МАЛДИ матрицы на ТСХ платины.
Характеристика микросфер золы уноса для их использования в качестве сорбента
Authors: Fomenko Aleksandra I. 
Published: December 2019

Работа посвящена изучению физико-химических свойств микросфер золы уноса (зольныхмикросфер) тепловых электростанций с целью последующего их использования в качестве сорбентадля очистки сточных вод от примесей различной природы. Определены химический и минералогический состав зольных микросфер. Выполнена оценка химической и механической стойкости, удельной поверхности, сорбционной способности материала. Анализ физических и химических свойств зольных микросфер показал, что исследованный материал соответствует требованиям ГОСТ Р 51641-2000 «Материалы фильтрующие зернистые. Общие технические условия» и является эффективным для использования, как в качестве самостоятельного сорбента, так и составляющей в системах водоочистки.
Predictive Validity of Saudi Admission Criteria for Freshmen Students’ English Performance: Experience of King Saud Bin Abdulaziz University for Health Sciences
Authors: Althewini Abdulaziz , Alkushi Abdulmohsen 
Published: December 2019

This study examines the relationship and correlation between initial admission criteria and English performance of first year students at King Saud bin Abdulaziz University for Health Sciences. The performance of 1,595 English language students was compared to the initial academic admission criteria to determine if a correlation exists between academic achievement pre and post admission. Admission criteria include high school grades, General Aptitude Test score (GAT), and Scholastic Achievement Admission Test scores (SAAT). Deep statistical analyses, including independent t tests and multiple linear regression reveal a correlation between pre and post admission performance. For this student population, GAT score was more predictive of English performance than SAAT scores, while the high school grade had no significant relationship to performance on the course. Furthermore, GAT had a higher predictive weight of 7% when compared individually with other admission criteria. However, in a combined model, all of the admission tests cumulatively predicted 17.3% of English performance. Such power is relatively low and requires additional variables to accurately predict a student’s final English score. This study provides unique analyses of performance within the Saudi higher education system and provides insight for those teaching or studying English as a second language. This study is therefore relevant for educators in universities using English for the instruction of non-English, native students and raises questions as to the value of current admission criteria.