bluuebunny/crossref_metadata_2025_split huggingface dataset:
A preliminary study of oxides of Fe doped with Ba, Co, Cu and synthetized by the citrate sol–gel combustion route
Authors: Basante-Delgado Sandra F. , González-Vidal Dalliver , Morales-Morales Jimmy A. , Aperador-Chaparro William A. , Gómez-Cuaspud Jairo A. 
Published: July 2020

AbstractIn the present work we report the synthesis of mixed ferrites doped with Co2+, Cu2+and Ba2+cations, using citrate sol–gel combustion route in air atmosphere, at 950 °C for 3 hours, produced substituted M-type barium ferrites powders particles with crystallite sizes varying between 145 and 155 nm. The percentages of yield obtained were on average 42%. The synthesized ferrites were characterized by techniques such as powder X-ray diffraction, evidencing the formation of M-type barium hexaferrite and copper and cobalt substituted M-type barium ferrite with hematite in smaller proportion. The possible growth of M-type barium ferrite with copper and cobalt may be due to a larger size of the cobalt atom with respect to copper and that a higher proportion of cobalt salt was used in the synthesis route. Increase in the metal ion substituted content leads to a decrease in the lattice strain and may be responsible for an increase in the crystallite size because greater tensile strain leads to elongation of the particles. The particle size of the synthesized ferrites differs significantly when they are doped, with Ferrite doped with copper having the smallest particle size compared to Ferrite doped with cobalt. We also performed spectroscopic analyses, RAMAN that showed, the substitution of cooper or cobalt in the M-type barium ferrite powders particle leads to a minor intensity of resonance band when compared with the parent compound and the differences between Fe3+, Cu2+and Co2+ions in a tetrahedral coordination is their ionic radii. The increase in the ionic radii causes a local distortion and vibrational bands of distorted polyhedra in substituted M-type barium ferrites. The chemical composition of this sample was determined as Ba1.0Fe11.83O19.22, Ba1.0Co1.02Fe11.01O18.35and Ba1.02Cu0.56Fe11.35O18.26using an AAS device. Both are very close to the theoretical formula. The influence of the synthesized ferrite samples was explored in the ozonation of a dye of unknown chemical structure. The effect was evidenced by visible ultraviolet spectroscopy technique. The results obtained show that the ink could be decolorized by applying oxidation by ozonation, however, when substituted M-type barium ferrite is added, the discoloration increases when this is doped with copper and cobalt, being higher using this last ferrite. The degradation process by ozonation presented in this work, carried out in the presence of copper and cobalt substituted M-type barium ferrites, would constitute an example of technology for the environment.
Photocatalitic Activity of N-doping TiO2 Thin Films Deposited by the Sol-Gel Technique
Authors: Vallejo William , Calderon Daniela , Díaz-Uribe Carlos 
Published: July 2020

Abstract
Titanium dioxide (TiO2) is a very stable semiconductor physically and chemically, it is an abundant material and harmless to nature. Currently, TiO2 is one of the most used photocatalysts to degrade organic molecules in both water and air during purification processes. In this work, we fabricated Nitrogen-doped TiO2 powders by the Sol-Gel method, the Titanium tetraisopropoxide and urea were as reagents; subsequently, the materials were supported as thin films on glass using the technique of Doctor Blade. The materials were characterized by using different analytical techniques such as Raman spectroscopy, X-Ray Diffraction (XRD), and diffuse reflectance spectroscopy (DRS). The XRD results indicated that TiO2 films presented a single crystalline phase, corresponding to the anatase. Besides, Raman spectroscopy verified the nitrogen incorporation in the crystal lattice of TiO2 after the doping process. Furthermore, DRS results showed an improvement in optical photo-response at the visible region of the electromagnetic spectrum, the band-gap narrowing was verified from 3.25 eV for unmodified TiO2 thin films until 2.84 eV TiO2–N(5%) thin films. Finally, the photocatalytic activity of materials was studied during methylene blue (MB) degradation, the photocatalytic degradation results indicated the doping process enhanced photocatalytic activity under visible irradiation.
Synthesis of colloidal silver nanoparticles and their bactericidal effects on E. coli, S. epidermidis and oral plaque
Authors: Fernando Ramirez Juan , Ortiz Juliana , Andrés Cuellar Jorge , Andrés Naranjo Carlos , Nelly Jiménez Francy , Moscoso Londoño Oscar 
Published: July 2020

Abstract
Silver nanoparticles have been obtained by colloidal synthesis using two different reducing agents: ascorbic acid and ethylene glycol. The colloids have been characterized by UV-Vis Spectroscopy, atomic absorption and transmission electron microscopy (TEM). The UV-visible spectra show the typical peak with a maximum ranging between 390-420 nm, due to the plasmon resonance of spherical silver nanoparticles. TEM micrographs show non-aggregated spherical silver nanoparticles whit diameters between 30 and 50 nm. The antibacterial effect was tested in three different bacteria cultures: Escherichia coli (gram negative), Staphylococcus epidermidis (gram positive) and dental plaque, which were grown in Mueller-Hinton agar. For comparative purposes the bactericidal effect of silver nitrate was also evaluated. Inhibition index (IIC) was calculated, obtaining satisfactory results for the three kinds of microorganism when silver nanoparticles are used.
The influence of pulsed laser ablation in liquids parameters on the synthesis of ZnO nanoparticles
Authors: Perez-Lopez Carlos Andres , Perez-Taborda Jaime Andres , Riascos Henry , Avila Alba 
Published: July 2020

Abstract
Pulsed laser ablation in liquids (PLAL) synthesis of Nanoparticles (NPs) is a bottom-up process with the advantage of the absence of chemical reagents in the solutions. In this process, NPs shape and diameter distributions on PLAL experimental parameters. We research the hydrodynamic diameter of the ZnO Nps correlation to media, wavelength, fluence, and irradiation time. Nine solutions, five in methanol and four in ultra-pure water were processed with fluences ranged from 4 to 15 J cm−2, target irradiation times from 8 to 15 min, and for wavelength of 532 nm and 1064 nm. We characterized the morphology and diameter distribution using Scanning Electron Microscopy (SEM) and Dynamic Light Scattering (DLS). Results showed that prolonging the irradiation time, reduces the diameter of the ZnO NPs by 41.4 % in methanol and increases it by 19.8 % in ultra-pure water. Change of medium from ultra-pure water to methanol revealed a maximum decrease of 84.2 % in NPs diameter while lowering the fluence resulted in a 62.6 % diameter reduction. The experimental results indicate that the medium and fluence were the most relevant parameters to obtain small NPs in methanol media with 80 nm diameter at 5 J cm−2, a wavelength of 1064 nm, and 20 min irradiation time and the diameter was less dependent on wavelength. Understanding the synthesis parameters and their effect on Nps diameter dispersion is critical for the scaling-up production to meet the PLAL’s promise of several grams per hour.
Least-Square Support Vector Machine (LS-SVM) Parameters Optimization using Hybrid Cuckoo Search and Harmony Search Algorithm for Pre Collision Warning on Driver Assistance System (DAS)
Authors: Sumarudin A , Puspaningrum A , Suheryadi A 
Published: July 2020

Abstract
The growth of technology has triggered transportation sector to deliver various kind of advantages. One of them is pre collision warning. There are several steps in warning a collision, namely classifying and predicting the collisions then. Many supervised machine learning algorithms have been conducted, one of well known algorithm is Least Square – Support Vector Machine (LS-SVM). Radial Based Function (RBF) is one of LS-SVM kernels which is well-known method to support reliable performance. However, C and Gamma of its parameters are chosen randomly. This makes the performance of the classifier less optimal. So that, hybrid cuckoo search and harmony search algorithm is conducted to optimize LSSVM parameters in this research. 8437 transportation records were used in the experiment and evaluated by using accuracy. Furthermore, the proposed method was also evaluated using several metaheuristic optimization algorithms namely Cuckoo Search Algorithm (CS-SVM), Bat Algorithm (BA-SVM), and Firefly Algorithm (FA-SVM). Experimental results show that hybrid Cuckoo Search and Harmony Search Algorithm (CSHS-SVM) successfully enhance the performance by reaching 84.513% for accuracy, compared to Cuckoo Search Algorithm, Bat Algorithm, and Firefly Algorithm.
A New Image Segmentation of Leptomeningeal Metastasis in Leukemia Patients
Authors: Ilmadina H Z , Arymurthy A M , Rosalina  
Published: July 2020

Abstract
Leptomeningeal metastasis is an indication of the malignancy that occurs in leukemia patients. Although it only has a 5-10% portion caused the leukemia patient to relapse, the abnormality is the basis in determining the best treatment given to them. Leptomeningeal metastasis are better detected by using Magnetic Resonance Imaging (MRI) because of their high sensitivity in neuraxis images. High ability to see and analyze is needed for a radiologist in reading the Brain MRI results of leukemia patients with suspect leptomeningeal metastasis. Therefore, the classification will take a long time and allow for the misreading of the results. In this experiment, we used a dataset from the Brain MRI of leukemia patients of Dharmais Cancer Hospital. We implemented the proposed method in performing the leptomeningeal metastasis segmentation. The preprocessing image applied for sharpening and removing unwanted noises in the image using the Median Filter. A hybrid semi-automated skull stripping was also developed to improve the accuracy of the segmentation. Then Fuzzy C-Means is used to segment the abnormalities and reach an average evaluation performance at 49.1% Jaccard Index.
Development of Radar-based Sensor System for Smart Level Crossing Technology
Authors: Rosyidi M , Irawati N , Nugroho S , Bismantoko S , Widodo T , Harvono A , Chasanah U 
Published: July 2020

Abstract
This research focuses on the development of Smart Level Crossing for preventing the accidents in the level crossing by detecting train at a certain distance before reaching the train gate inside the level crossing area. In order to detect the train in the level crossing, sensors for detecting train and communication systems that sends data to the train gate must be determined. This research tries to utilize a radar-based sensor as main part for train detection. This system would communicate with the micro-controller to accordingly carry out the gate closing and opening operations. Warning lamp and warning light would be present to warn off pedestrians that use level area crossing. Manual back up system will replace the automatic system in the case of smart level crossing system sensor fail to trigger.
Networked Control System in Quadrotor Altitude Control with Time Delay Compensation
Authors: Panuntun R , Wahyunggoro O , Herdjunanto S , Rafsanzani A R , Setiawan N 
Published: July 2020

Abstract
Networked control system (NCS), which has the advantage of control signal efficiency, suits quadrotor control scheme. However, the application of NCS in quadrotor may suffer from time delay. Thus, a strategy for compensating time delay is needed. In this paper, we used Smith predictor to compensate delay in quadrotor altitude control. Simulation experiment with quadrotor model indicates that the addition of Smith predictor successfully tracked reference signal with better performance compared to the conventional method in various time delay, even under simulated wind disturbance.
Prototype of Integrated Livestock Recording Application with Animal Identification and Certification System in Kebumen
Authors: Subagyo U , Ardiansyah D 
Published: July 2020

Abstract
The Department of Agriculture and Food of Kebumen has utilized information technology to register livestock and provide identity cards to livestock with the Livestock Card Database system. Unfortunately, between the Livestock Card Database System and the Recording and Certification System was not integrated, so there is one job carried out by two officers. Data on making livestock cards comes from forms filled out by data officers in the village area from livestock, while data recording comes from recording officers from members of herding group / designated officers. The output of this research is in the form of an Android-based recording application prototype design, which is integrated with the livestock card database system as an identification system, and the recording and certification system as a system for animalcertification.
Surface Deformation due to the 2017-2018 Agung Volcano Eruption from Interferometric Synthetic Aperture Radar (InSAR) Sentinel-1 TOPS
Authors: Suwarsono  , Triyono D , Khomarudin M R , Rokhmatuloh  
Published: July 2020

AbstractThis paper described the application of Sentinel-1 TOPS (Terrain Observation by Progressive Scans) SAR (Synthetic Aperture Radar) to analyze the surface deformation of the Agung Volcano due to 2017-2018 eruption. Agung volcano is an active stratovolcano located in eastern part of Bali island. We processed the interferometric from a pair of Sentinel-1A each representing before and after eruption periods. The results of this research showed that the eruption of Agung Volcano during 2017-2018 has caused surface deformation. The deformation that occurs was related to changes in land surface due to lava and pyroclastic deposits resulting from the eruption process in the area around the crater and the northern slope.
Collaborative impact of the NAO and atmospheric blocking on European heatwaves, with a focus on the hot summer of 2018
Authors: Li Muyuan , Yao Yao , Simmonds Ian , Luo Dehai , Zhong Linhao , Chen Xiaodan 
Published: July 2020

Abstract
Two intense heatwaves of July and early August 2018 are found to be associated with a European blocking (EB) event accompanied by a series of consecutive positive North Atlantic Oscillation (NAO+) events. Further analyses show that the collaborative role of an EB event and its upstream NAO+ pattern could increase the frequency, persistence, magnitude and scale of heatwaves over Europe. Compared with NAO+-unrelated EB events, NAO+-related EB events are less movable (quasi-stationary) and more persistent over Europe, which could contribute to an increase in the intensity and persistence of heatwaves. In addition, the blocking high of this type has a northeast–southwest orientation with stronger warm airflow and less precipitation in northern and western Europe, where large scopes of higher temperatures tend to occur. In contrast, NAO+-unrelated EB events without orientation correspond to a trough in the south, which results in increased precipitation and cold air in the southern part of Europe, and thus high temperatures contract to the northern part of Europe. Moreover, considering that the NAO+ pattern leads the formation of an EB event, the NAO+ pattern might serve as a potential predictor for European heatwaves. Our conclusions are strongly supported by the analysis of CMIP6 historical simulations which also capture the differences of high temperatures and atmospheric circulations between NAO+-related EB events and NAO+-unrelated EB events.
Does Combining Severe and Mild Cases of COVID-19 Produce Low Fatality Rates After Treatment With Hydroxychloroquine and Azithromycin?
Authors: Fleury Vincent 
Published: July 2020

Abstract
In this issue of the Journal, Dr. Risch (Am J Epidemiol. 2020;189(11):1218–1226) posits that the use of a combination of hydroxychloroquine and azithromycin as an outpatient treatment for high-risk patients with coronavirus 19 should be increased as a way to help curtail the ongoing pandemic. However, a calculation error occurred in the original article, and new data about the studies cited have come to light. Peculiarities in the methods of data collection and reporting in those original sources must be considered when evaluating the evidence for or against hydroxychloroquine and azithromycin bitherapy.
Clinical impact and ‘natural’ course of uncorrected tricuspid regurgitation after implantation of a left ventricular assist device: an analysis of the European Registry for Patients with Mechanical Circulatory Support (EUROMACS)
Authors: Veen Kevin M , Mokhles Mostafa M , Soliman Osama , de By Theo M.M.H , Mohacsi Paul , Schoenrath Felix , Paluszkiewicz Lech , Netuka Ivan , Bogers Ad J.J.C , Takkenberg Johanna J.M , Caliskan Kadir ,   the EUROMACS Investigators
Published: July 2020

Abstract

OBJECTIVES

Data on the impact and course of uncorrected tricuspid regurgitation (TR) during left ventricular assist device (LVAD) implantation are scarce and inconsistent. This study explores the clinical impact and natural course of uncorrected TR in patients after LVAD implantation.

METHODS
The European Registry for Patients with Mechanical Circulatory Support was used to identify adult patients with LVAD implants without concomitant tricuspid valve surgery. A mediation model was developed to assess the association of TR with 30-day mortality via other risk factors. Generalized mixed models were used to model the course of post-LVAD TR. Joint models were used to perform sensitivity analyses.

RESULTS
A total of 2496 procedures were included (median age: 56 years; men: 83%). TR was not directly associated with higher 30-day mortality, but mediation analyses suggested an indirect association via preoperative elevated right atrial pressure and creatinine (P = 0.035) and bilirubin (P = 0.027) levels. Post-LVAD TR was also associated with increased late mortality [hazard ratio 1.16 (1.06–1.3); P = 0.001]. On average, uncorrected TR diminished after LVAD implantation. The probability of having moderate-to-severe TR immediately after an implant in patients with none-to-mild TR pre-LVAD was 10%; in patients with moderate-to-severe TR pre-LVAD, it was 35% and continued to decrease in patients with moderate-to-severe TR pre-LVAD, regardless of pre-LVAD right ventricular failure or pulmonary hypertension.

CONCLUSIONS
Uncorrected TR pre-LVAD and post-LVAD is associated with increased early and late mortality. Nevertheless, on average, TR diminishes progressively without intervention after an LVAD implant. Therefore, these data suggest that patient selection for concomitant tricuspid valve surgery should not be based solely on TR grade.
Genetic relationships between early menopause and the behaviour of theca interna during follicular atresia
Authors: Rodgers Raymond J , Laven Joop S E 
Published: July 2020

ABSTRACT
Genetic variants are known to contribute to about 50% of the heritability of the age of menopause and recent studies suggest that genes associated with genome maintenance are involved. The idea that increased rates of follicular atresia could lead to depletion of the primoridial follicle reserve and early menopause has also been canvassed, but there is no direct evidence of this. In studies of the transcriptomics of follicular atresia, it was found that in the theca interna, the largest group of genes are in fact down-regulated and associated with ‘cell cycle and DNA replication’, in contrast with the up-regulation of apoptosis-associated genes which occurs in granulosa cells. Many of the genes down-regulated in the theca interna are the same as or related to the genes in loci associated with early menopause. From these findings, we suggest that early menopause could be due to increased rates of follicular atresia initiated from the theca interna.
The effect of autologous adipose derived mesenchymal stem cell therapy on juvenile osteochondritis dissecans of the patella: a case study
Authors: Russo Alessandro , Coco Vito , Zaffagnini Stefano 
Published: July 2020

Abstract
A prospective analysis of the effect of autologous adipose derived mesenchymal stem cell (AD-MSCs) therapy in the treatment of a juvenile osteochondritis dissecans (JOCD) of the patella. After failed conventional management of JOCD, a 13-year-old patient undergoes intra-articular MSC therapy. Repeated magnetic resonance imaging analyses showed regeneration of cartilage. In this report, the use of AD-MSCs, after unsuccessful conventional JOCD management, resulted in structural, functional and pain improvement. These results highlight the possibility to avoid surgery treatment in JOCD patella treatment.
Onesimus the Letter Carrier and the Initial Reception of Paul’s Letter to Philemon
Authors: Head Peter M 
Published: July 2020

Abstract
After an introduction to the letter to Philemon this article argues that the traditional identification of Onesimus as the letter carrier is far more plausible than any of the recently proposed alternatives (Tychicus, Timothy, an unknown person). It is further argued that the letter addresses the relationships between Paul, Philemon, and Onesimus, using language reminiscent of the ‘letter of recommendation’. Since such letters are both habitually ambiguous and require the letter carrier to continue the conversation initiated by the letter, it follows that Onesimus was trusted by Paul to help Philemon receive the letter. It is further argued on both general and Pauline grounds that it is plausible to think that Onesimus would have resolved the ambiguity inherent in the written communication with a verbal request for manumission.
Stripes, Hats, and Fashion
Authors: Ron Zvi 
Published: July 2020

Abstract
This article examines the relationship between fashion and Jewish clothing. Certain clothing elements that are today considered signifiers of Jewish people, even among non-Jews, did not begin as specifically Jewish clothing. They started as the fashion of the general society but were retained by the Jewish community even after the fashions changed in the general world. In this article, we trace the process by which three such elements became associated specifically with Jews and Jewish ritual practice: the striped tallit, Hasidic dress, and black hats. Black hats are the most recent example of this process, and in this case have also developed legal significance in some Orthodox circles. This results in a fashion element being prevented from ever going out of style by virtue of being considered a halachic requirement.