bluuebunny/crossref_metadata_2025_split huggingface dataset:
Association of Hyperglycemia and Final TIMI Flow with One-Year Mortality of Patients with Acute ST-Segment Elevation Myocardial Infarction Undergoing Primary PCI
Authors: Dharma Surya , Mahavira Andi , Haryono Nur , Sukmawan Renan , Dakota Iwan , Siswanto Bambang B. , Rao Sunil V. 
Published: June 2019

The association of hyperglycemia at admission and final thrombolysis in myocardial infarction (TIMI) flow with 1-year mortality of patient with acute ST-segment elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention (PCI) has not much been explored. We evaluated the association of hyperglycemia and final TIMI flow with 1-year mortality in patients with acute STEMI who underwent primary PCI.We retrospectively analyzed 856 patients with STEMI who underwent primary PCI in a tertiary care academic center between January 2014 and July 2016. Based on the receiver operating characteristics curve, the cutoff used for hyperglycemia in this study was greater than or equal to 169 mg/dL. Cox proportional hazard model was used to determine the association of hyperglycemia and TIMI flow with 1-year mortality.Compared with patients with lower blood glucose level (<169 mg/dL; n = 549), a greater proportion of patients who presented with hyperglycemia (≥169 mg/dL; n = 307) had final TIMI flow 0 to 1 (3.3 vs. 0.5%; adjusted odds ratio = 5.58, 95% confidence interval [CI] 1.30–23.9, p = 0.02). Hyperglycemia was associated with an increased risk for 1-year mortality (adjusted hazard ratio [HR]= 2.0, 95% CI: 1.13–3.53, p = 0.017). Multivariable Cox regression showed that the interaction of hyperglycemia and final TIMI flow 0 to 1 was associated with an elevated risk for 1-year mortality (adjusted HR= 9.4, 95% CI: 2.34–37.81, p = 0.002).A higher proportion of patients with acute STEMI who presented with hyperglycemia had final TIMI flow 0 to 1 after primary PCI. The interaction of hyperglycemia and final TIMI flow 0 to 1 was associated with an increased risk for 1-year mortality. This study suggests that aggressive control of hyperglycemia prior to primary PCI may facilitate better angiographic and clinical outcomes after primary PCI.
Clinical Trial Registration Clinicaltrials.gov Identifier number: NCT02319473.
Purely Endoscopic Resection of Cavernoma of the Septum Pellucidum
Authors: Baldo Sara , Magrini Salima , Tacconi Leonello 
Published: June 2019

AbstractThe intraventricular location of a cavernoma is a rare entity and accounts for approximately 2.5% of all cavernomas of the central nervous system. They are commonly found in the lateral ventricle followed by the third and fourth ventricles. The location in the septum pellucidum is rare, and only four cases have been reported in the international literature. An open craniotomy was performed in all these cases. To the best of our knowledge, this is the first case of a cavernoma of the septum pellucidum successfully resected using a purely endoscopic transventricular approach.
格西霍爾語動詞的時與體
Authors: Tian Qianzi , Sun Jackson T.-S. 
Published: June 2019

抽象
霍爾語是四川境內較少人知的語群，屬於漢藏語系羌語支嘉戎語組。本文首度詳細介紹中部霍爾語格西話動詞的時－體範疇。保守的嘉戎語組語言，動詞均採「三分式」時－體系統，一般以方向前綴區別完整體與非完整體，以不同的詞幹標記過去與非過去時。相較於這種保守的形態格局，格西話動詞的時－體系統有數項重要的創新：（一）動詞詞幹交替大幅簡化，標註時間的功能基本喪失；（二）方向前綴從體標記轉成「相對過去時」標記，可通用的相對過去前綴də-開始逐步取代其他前綴，且有聚焦於動作結果的延伸功能；（三）以贅語式造出一般非完整體及「持續體」構造。這些重要的創新既源自內部衍變的機制，也明顯受到本地主流藏語的接觸影響。
The origin and spread of Mizo gender suffixes *-a and *-i on personal
names
Authors: Bik Kenneth Van 
Published: June 2019

Abstract
This study presents a diachronic puzzle of the gender suffixes’ origin in Mizo personal names, -a
for male and -i for female. It also provides a plausible sociolinguistic explanation for the fast spread of its
use by the whole population, that is, the use of these gender suffixes was expedited as a result of the adoption by the well
respected missionaries.
A Spinor Approach to the SU(2) Clebsch-Gordan Coefficients*
Authors: Yang Ling-Di , Chen Fa-Min 
Published: June 2019

Abstract
We review the irreducible representation of an angular momentum vector operator constructed in terms of spinor algebra. We generalize the idea of spinor approach to study the coupling of the eigenstates of two independent angular momentum vector operators. Utilizing the spinor algebra, we are able to develop a simple way for calculating the SU(2) Clebsch-Gordan (CG) coefficients. The explicit expression for the SU(2) CG coefficients is worked out, and some simple physical examples are presented to illustrate the spinor approach.
Analysis on Lump, Lumpoff and Rogue Waves with Predictability to a Generalized Konopelchenko-Dubrovsky-Kaup-Kupershmidt Equation*
Authors: Liu Wen-Hao , Zhang Yu-Feng , Shi Dan-Dan 
Published: June 2019

Abstract
In this paper, we investigate a (2+1)-dimensional generalized Konopelchenko-Dubrovsky-Kaup-Kupershmidt equation. The lump waves, lumpoff waves, and rogue waves are presented based on the Hirota bilinear form of this equation. It is worth noting that the moving path as well as the appearance time and place of the lump waves are given. Moreover, the special rogue waves are considered when lump solution is swallowed by double solitons. Finally, the corresponding characteristics of the dynamical behavior are displayed.
Efficient Network Dismantling via Node Explosive Percolation*
Authors: Qin Shao-Meng , Ren Xiao-Long , Lü Lin-Yuan 
Published: June 2019

Abstract

The network dismantling problem asks the minimum separate node set of a graph whose removal will break the graph into connected components with the size not larger than the one percentage of the original graph. This problem has attracted much attention recently and a lot of algorithms have been proposed. However, most of the network dismantling algorithms mainly focus on which nodes are included in the minimum separate set but overlook how to order them for removal, which will lead to low general efficiency during the dismantling process. In this paper, we reformulate the network dismantling problem by taking the order of nodes’ removal into consideration. An efficient dismantling sequence will break the network quickly during the dismantling processes. We take the belief-propagation guided decimation (BPD) dismantling algorithm, a state-of-the-art algorithm, as an example, and employ the node explosive percolation (NEP) algorithm to reorder the early part of the dismantling sequence given by the BPD. The proposed method is denoted as the NEP-BPD algorithm (NBA) here. The numerical results on Erdös-Rényi graphs, random-regular graphs, scale-free graphs, and some real networks show the high general efficiency of NBA during the entire dismantling process. In addition, numerical computations on random graph ensembles with the size from 210
to 219
exhibit that the NBA is in the same complexity class with the BPD algorithm. It is clear that the NEP method we used to improve the general efficiency could also be applied to other dismantling algorithms, such as Min-Sum algorithm, equal graph partitioning algorithm and so on.
Numerical and experimental study of flexural behaviour in polymer composite materials reinforced with natural fique textiles
Authors: Barros F A , Gamboa J M , Díaz-Ramírez G A , González-Estrada O A , Cruz R A 
Published: June 2019

Abstract
This work presents the experimental testing and numerical modelling for the flexural behaviour of polymer composites reinforced with fique fibre (furcraea andina) textiles. We considered two different textile configurations embedded in an epoxy matrix to perform the experimental tests and used finite element analysis (FEA) for the numerical approximation. Bending tests are performed according to ASTM D7264. We determined the equivalent elastic properties for the woven composites, according to the properties of raw materials and the fibre-matrix interface. Next, we applied flexural loads to the numerical models to analyse their mechanical behaviour and compared the numerical results with the experimental data previously obtained. This research aims to contribute to establish a baseline to develop new mechanisms to forecast the mechanical behaviour of composites reinforced with natural textiles, and, in this way, propose applications for structural engineering.
Study of ZnO1-xSx synthesis by non-alcoxide sol-gel method employed in the photocatalytic degradation of a persistent organic pollutant in water
Authors: Mena Arenas Javier , Mass Varela Julio , Manotas Albor Milton , Landínez Téllez David 
Published: June 2019

Abstract
Non-Alcoxide Sol-Gel method was used as synthesis route to obtain the ZnO1-xSx compounds at calcination temperatures of 250 ° C, 300 ° C and 400 ° C, doped with Sulfur at mole fractions of x = 0.05, 0.50, 0.80. The samples obtained were characterized structural and optically by both X-ray diffraction (XRD) and diffuse reflectance spectrophotometry. The XRD analysis showed the formation of the Wurtzite type structure proper of ZnO up to Sulfur mole fraction of x = 0.50. It was observed that this phase disappears at a mole fraction of x = 0.80 and converts to Cubic Zinc blende type structure proper of Zinc Sulfide. Furthermore, was observed that increasing calcination temperature higher crystallinity was achieved for all set of samples. The Rietveld refinement method was used to obtain lattice parameters for Wurtzite structure as well as cell volume and the ratio c/a. These parameters show slight incremental changes in relation to S doped ZnO crystalline structure. On the other hand, it was determined optically, that increasing the dopant concentration to a mole fraction x = 0.50, a maximum reduction of the band gap from 3,29 eV to 2,70 eV was reached, while increasing the calcination temperature shows a general tendency to band gap reduction. Photocatalytic activity of Sulfur doped and pure ZnO powders were tested for degradation of p, p’-DDT under visible light, measuring the p, p’-DDT time-dependent concentration by gas chromatography-μECD coupling. The results revealed that the sulfur modified ZnO material showed an improved photocatalytic activity towards p, p’-DDT under visible light illumination respect to pure ZnO.
Platinum vs transition metal carbide surfaces as catalysts for olefin and alkyne conversion: binding and hydrogenation of ethylidyne
Authors: Jimenez-Orozco C , Florez E , Moreno A , Rodriguez J.A. 
Published: June 2019

Abstract
The development of heterogeneous catalysts with activity for the hydrogenation of unsaturated hydrocarbons is of economic importance. Ethylene (C2H4) and acetylene (C2H2) are probe molecules useful to understand the hydrogenation mechanisms, where the most studied surfaces are Pt(111) and Pd(111), however, they have a limited activity due to the formation and accumulation of ethylidyne (CCH3) species. Therefore, alternative catalysts should be developed to limit and/or avoid the formation of ethylidyne on the surface. Transition metal carbides has been reported as alternative catalysts, with the additional advantage of lower prices. The thermodynamics of ethylidyne binding and its transformations on δ-MoC(001), TiC(001), and β-Mo2C(100) surfaces are studied by means of periodic DFT. The results indicate that ethylidyne could be transformed to ethyl and ethane on δ-MoC(001) and TiC(001) surfaces, which are relevant species to the Horiuti-Polanyi mechanism. Therefore, these surfaces could be an alternative to Pt(111) and Pd(111), since ethylidyne could be transformed to other species, avoiding or limiting their deactivation. Conversely, ethylidyne cannot be transformed to vinyl (CHCH2) or ethylene in a Horiuti-Polanyi-like mechanism; then, it is not thermodynamically feasible to use any of the studied surfaces in the selective hydrogenation of acetylene, since ethylidyne accumulation could poison the surfaces.
Shallow donor in spirally rolled-up quantum well
Authors: Castro D Y , Mikhailov I D 
Published: June 2019

Abstract
We study the spectral properties of a shallow donor confined in spirally rolled-up narrow quantum well, in the e˙ective mass approximation. By using the natural curvilinear coordinates, we reduce the problem for the actual system to a two-dimensional wave equation that describes the movement of the electron bound to donor inside the rolled-up well. Solving this equation by means of the double Fourier series expansion method, we found lower donor energies and the density of energy states for different donor positions. Our calculations show that donor energies are very sensible to the variation of the donor position and the geometry of the spiral.
Quality Control Implementation on Digital Radiography Equipment at Fundación Valle Del Lili
Authors: Durán E J , Salas L F , Benavides S O , Bolaños G 
Published: June 2019

Abstract
Either national regulatory process or international accreditation process obligates the healthcare institutions to implement a quality control programs to the digital radiography equipment. These are made in order to assurance the high quality image and to reduce the unnecessary exposure doses on people. In radiology, a good diagnostic is related with the high quality of the image. In this research it is showed the results of 90 quality control tests performed on three different equipment located at Fundación Valle del Lili (FVL). These tests were particularly: physical location inspection, geometrical features, quality of the beam, automatic exposure control (AEC), quality image in digital systems, dose measurement systems, etc. Outcomes were compared with manufacturer’s reference values. A percentage of 92.23 % were found out in optimal conditions, this means 83 checks. The Dose Area Product (DAP) tests’ results are in a range between 5.57 to 2574.70 μGy*m2, which are reported in the literature. Those tests that not belong in the reference values, were subject to corrective actions and it is generated a feedback about the possible failures.
Estimation of soil resistivity by the assembly of a vertical electrical sounding equipment at a university campus at Turbaco, Bolívar
Authors: Caraballo D , Caballero M 
Published: June 2019

Abstract
A low-cost geoelectric equipment was implemented for academic purposes to carry out the Vertical Electrical Sounding method in order to determine the resistivity and depth of a point on the surface of a university zone and obtain the contrasts of that resistivity parameter for each type of soil. A model was reproduced at the laboratory to calibrate the equipment, and then the technique was tested in the field. Among the results, layers of sandy loam, soft limestone and dark clay with thicknesses of 0.3 m, 0.75 m and 12 m respectively were obtained, finally a clear clay was obtained whose thickness is unknown. These were compared with reference samples by well drilling method. There was a concordance between the results through the method of statistical confidence intervals with a normal distribution. The data behaved according to a soil model of lower-higher-lower resistivity.
A brief discussion of the magnetocaloric effect in thin films of manganite doped with chromium
Authors: Campillo G , Figueroa A I , Arnache O , Osorio J , Marín Ramírez J M , Fallarino L 
Published: June 2019

Abstract
In this work we report on the magnetocaloric effect of La2/3Ca1/3MnO3 (LCMO) and La2/3Ca1/3Mn0.94Cr0.06O3 (LCMCrO) manganite thin films grown by DC magnetron sputtering on LaAlO3 (100) substrates. X-ray diffraction shows that both doped and undoped films crystallize in the orthorhombic structure. Magnetic measurements show a decrease in both the Curie temperature, TC
, and the saturation magnetization, MS
, for the LCMCrO sample. The change in the magnetic entropy (ΔSm
) was extracted from hysteresis loops at different temperatures around the ferromagnetic to paramagnetic transition, displaying a maximum of entropy change (ΔSm
)
max
near TC
in both films. Moreover, a shift in (ΔSm
)
max
toward temperatures above TC
with increasing magnetic field and a broadening of the entropy change curve were observed. Results of refrigeration cooling power show a lower efficiency for LCMCrO. In order to obtain a local insight into the magnetic interactions of these films, measurements of X-ray absorption spectroscopy and X-ray magnetic circular dichroism (XMCD) were performed. XMCD suggests that an antiferromagnetic coupling between Mn4+ - Mn3+ is favored with Cr3+ incorporation, which reduces the Mn L
2,3 XMCD signal and results in a decrease of MS
and (ΔSm
)
max
in LCMCrO films.
Development of a Steady-State Fluorescence Spectroscopy System and a Time-Resolved Fluorescence Spectroscopy System
Authors: Gutiérrez D. , Álvarez J. , Racedo F. 
Published: June 2019

AbstractThis document describes thoroughly the construction of two spectroscopic systems: One system for obtaining fluorescence spectra and another system for obtaining the fluorescence lifetime. The first system consists of obtaining the fluorescence spectrum and is constituted by a Czerny-Turner type monochromator, a photomultiplier tube (PMT), a system for modulating the excitation signal and a system for treating and filtering the fluorescent signal constituted by an electromechanical chopper, a lock-in amplifier and a fast response PMT; plus a set of lenses and a samples holder. The fluorescein dissolved in ethanol was used as a calibration standard, and an Nd:YAG laser source was used as a source of excitation, which emits in 532nm, of continuous wave and stable power in time adjustable by current. On the other hand, a fluorescence time-resolved system was developed. This system consists of obtaining the fluorescence lifetime of different samples under study from a Voltage curve Vs Time obtained from the system and showing the decay behavior of the phenomenon. This has a pulsed laser unit as a source of excitation, emitting at 532nm, 80mJof energy and with a pulse width of 4ns. For this system, two semiconductor photodiode detectors with fast response have been built; both with a response of temporary uptake above 1ns, thus providing obtaining fluorescence lifetime up to this value. Fluorescein was also used in this system as a standard sample, but in this case dissolved in a buffer-like solution; accompanied also by a brief study of the change in the average lifespan of fluorescence in function of the pH of the solution. The results obtained show that two automated systems, reproducible, accurate and of very low cost compared to the current ones, have been successfully implemented for the study of steady-state and time-resolved fluorescence spectroscopy.
Investigation of laser wavelength effect on optical properties of graphene oxide colloidal nanostructures prepared by pulsed laser ablation
Authors: Duque Buitrago J. S. , Mesa Yandy A. M. , Riascos Landázuri H. 
Published: June 2019

Abstract
In this work we prepared graphene oxide nanostructures (GONE) in a liquid environment using pulsed laser ablation technique. We used for the synthesis Nd: YAG pulsed laser operatating at 1064 nm and 532 nm of wavelength, we study the effect of wavelength of the laser on the optical properties of Nanostructures (NE) synthesized. The aim was determining the optical bandgap and the characteristic peak related by bond transitions using the absorbance UV-Vis spectra. Both samples show high absorption in the ultraviolet region in the UV-Vis spectra. Using Tauc’s plot method we compute the bandgap energy for GONEs assuming indirect bandgap. In addition, we observe characteristic peak formation 1 hour after synthesized NPs at 256 nm for NPs prepared at 1064 nm and for NPs prepared at 532 nm the peak with less intensity is observed at a wavelength of 218 nm. The characteristic peak for both samples increase of intensity 24 hours after preparation.
UV-Vis spectroscopy of Mn-doped ZnO thin films prepared by pulsed laser deposition
Authors: Riascos H. , Rosero C. , Avila-Torres Y. 
Published: June 2019

Abstract
Mn-doped zinc oxide (ZnMnO) is of increasing interest to the optoelectronic community for thin film sensors, transistors and solar cells applications. Considerable variability exists in the literature on the growth and doping of ZnMnO films, especially as a function of growth approach, temperature, and oxygen partial pressure. We fabricated ZnMnO thin films on silicon substrates by pulsed laser deposition (PLD). The deposition pressure and the substrate temperature were varied from 2.67 Pa to 26.67 Pa, and from room temperature to 600 °C, respectively. The targets were fabricated with a nominal composition of 1, 5, 10, 15 and 20 wt.% Mn. The influence of the Mn composition, deposition pressure and the substrate temperature on optical properties of the ZnO films was investigated using ultraviolet– visible (UV–Vis) spectrometry. The optical band-gap of the films was evaluated in terms of the Kubelka-Munk function. The results show that the oxygen gas pressure has slightly affected the optical band-gap of the deposited films. Furthermore, the substrate temperature play significant role in the optical properties of the deposited ZnMnO thin films.
Implementation of the Operational Modal Analysis technique in a power transmission shaft
Authors: Sanchez H G , Nova F R , Gonzalez-Estrada O A 
Published: June 2019

Abstract
In this paper, we investigate the application of modal identification techniques used in civil structures, in which the excitation forces are not known, and extrapolate them to mechanical elements in operating conditions. A methodology is proposed to identify the modal parameters of a power transmission shaft under rotation. The methodology is based on the comparison of theoretical and experimental results. First, a simulation of the element under study is carried out, using a numerical model based on the Finite Element Method, to evaluate its theoretical dynamic characteristics. Then, an Experimental Modal Analysis (EMA) is performed and the theoretical model is verified by comparing theoretical and experimental results. Moreover, an algorithm based on the non-parametric technique “Peak Pickin” of an Operational Modal Analysis (OMA) is developed and, from the records of accelerations obtained in the bearings, we identify the modal parameters of the shaft. These results are compared with the theoretical values, calculated previously and, thus, verify the effectiveness of the implemented technique.
Analysis of synchronism and response velocity in instrumental assemblies for the observation of stellar occultations
Authors: Eduardo Salazar Manzano Luis , Parra Patiño Miguel Ángel , Salazar Manzano Miguel Ángel , Arias Santa Nathalia , Andrés Quintero Salazar Edwin 
Published: June 2019

Abstract
Currently the stellar occultation technique is one of the most effective methods for observing minor bodies of the Solar System. Due to the collaborative nature of these observations, precise synchronization and short response times are necessary in instrumental assemblies. This paper presents the development of a methodology that allows for the evaluation of the temporal performance of the detectors used in the observation of stellar occultations. The software “TimesCCam” was developed, which, when being photographed by astronomical cameras, graphically represents the parameters of exposure time, dead time, and jitter referenced to UTC. The process of alignment and focus is obtained, thanks to a structure built with movement in the three axes. The methodology was applied in the evaluation of STF-8300M, ST-2000XM and QHY174M-GPS cameras, using different driver software, synchronization methods, and exposure times. In real exposure times, insignificant variations were identified. Dependency was found between the dead times and the configurations used for the CCD cameras, and it was determined that the dead time and its instability in the ST-2000XM camera prevent its use for the observation of stellar occultations. The results show that the STF-8300M camera is convenient for the observation of asteroid occultations, while the QHY174M-GPS camera given its dead time and synchronization, is suitable for the observation of occultations by trans-Neptunian objects.