bluuebunny/crossref_metadata_2025_split huggingface dataset:
Activity time series of old stars from late F to early K
Authors: Meunier N. , Lagrange A.-M. , Cuzacq S. 
Published: November 2019

Context. Inhibition of the convective blueshift in active regions is a major contribution to the radial velocity (RV) variations, at least for solar-like stars. A common technique to correct for this component is to model the RV as a linear function of chromospheric emission, because both are strongly correlated with the coverage by plages.
Aims. This correction, although efficient, is not perfect: the aim of the present study is to understand the limits of this correction and to improve it.
Methods. We investigate these questions by analysing a large set of synthetic time series corresponding to old main sequence F6-K4 stars modelled using a consistent set of parameters. We focus here on the analysis of the correlation between time series, in particular between RV (variability due to different processes) and chromospheric emission on different timescales. We also study the temporal variation for each time series.
Results. We find that inclination strongly impacts these correlations, as well as the presence of additional signals (in particular granulation and supergranulation). Although RV and log R′HK are often well correlated, a combination of geometrical effects (butterfly diagrams related to dynamo processes and inclination) and activity level variations over time create an hysteresis pattern during the cycle, which produces a departure from an excellent correlation: for a given activity level, the RV is higher or lower during the ascending phase compared to the descending phase of the cycle depending on inclination, with a reversal for inclinations about 60° from pole-on. We find that this hysteresis is also observed for the Sun, as well as for other stars. This property is due to the spatio-temporal distribution of the activity pattern (and therefore to the dynamo processes) and to the difference in projection effects of the RV and chromospheric emission.
Conclusions. These results allow us to propose a new method which significantly improves the correction for long timescales (fraction of the cycle), and could be crucial to improving detection rates of planets in the habitable zone around F6-K4 stars.
Körperliches Training bei pulmonaler Hypertonie – ein systematisches Review mit Metaanalyse
Authors: Glöckl R. , Schneeberger T. , Boeselt T. , Kenn K. , Koczulla A. R. , Held M. , Oberhoffer R. , Halle M. 
Published: November 2019

Zusammenfassung
Hintergrund Pulmonale Hypertonie (PH) ist definiert als ein Anstieg des mittleren pulmonal-arteriellen Drucks auf > 20 mmHg in Ruhe, der auf Dauer zu einer Rechtsherzinsuffizienz führen kann. Bis vor einigen Jahren wurde PH-Patienten wegen der Befürchtung einer möglichen Symptomverschlechterung und dem Auftreten unerwünschter, belastungsassoziierter klinischer Ereignisse von körperlichem Training abgeraten.
Methoden Drei elektronische Datenbanken wurden mit folgenden Suchbegriffen nach randomisiert, kontrollierten Studien durchsucht, in denen eine Trainingsintervention bei PH-Patienten untersucht wurde: „pulmonary hypertension ODER „pulmonary arterial hypertension“ UND „exercise“ ODER „pulmonary rehabilitation“ UND „randomized“.
Ergebnisse In dieser Metaanalyse konnten Daten von 5 Studien mit insgesamt 187 PH-Patienten eingeschlossen werden, welche 3- bis 12-wöchige Trainingsprogramme (z. B. 10 – 45 Minuten Ergometertraining; 60 – 80 % der maximalen Herzfrequenz) absolvierten. Patienten in den Trainingsgruppen wiesen im Vergleich zur Kontrollgruppe signifikante (p < 0,001) Verbesserungen ihrer körperlichen Belastbarkeit auf: 6-Minuten-Gehtest: + 45 m [95 % KI: 26 m – 64 m] oder maximale Sauerstoffaufnahme VO
2
peak + 2,3 ml/kg/min [95 % KI: 1,8 ml/kg/min – 2,9 ml/kg/min]. Auch Komponenten der körperlichen und psychischen Lebensqualität verbesserten sich signifikant. Ernsthafte, unerwünschte Ereignisse im Rahmen der Trainingsinterventionen wurden nicht beobachtet.
Schlussfolgerung Ein individuell angepasstes Trainingsprogramm bei stabilen PH-Patienten kann nach zuvor optimierter medikamentöser Therapie die körperliche Belastbarkeit und Lebensqualität ohne nachweisbare klinische Gefährdung verbessern. Diese Einschätzungen basieren bisher nur auf kleinen Fallzahlen und größere, randomisierte Studien mit unterschiedlichen PH-Schweregraden sind dringend notwendig.
Quantification of the resilience of primary care networks by stress testing the health care system
Authors: Lo Sardo Donald Ruggiero , Thurner Stefan , Sorger Johannes , Duftschmid Georg , Endel Gottfried , Klimek Peter 
Published: November 2019

Significance
We shock a full-scale simulation model of a national health care system by locally removing health care providers. We measure resilience of the system in terms of how fast and to what extent it can recover its ability to deliver adequate health services to the population. The model is based on actual regional primary care networks in Austria, where all patients and physicians are represented as anonymized avatars that are calibrated with nationwide data. After removal of a critical fraction of physicians, networks generically undergo a transition from resilient to nonresilient behavior, where it is impossible to maintain coverage for all patients. These “stress tests” allow us to quantify regional health care resilience and identify systemically risky health care providers.
Shockley–Queisser triangle predicts the thermodynamic efficiency limits of arbitrarily complex multijunction bifacial solar cells
Authors: Alam Muhammad A. , Khan M. Ryyan 
Published: November 2019

Significance
A solar cell converts sunlight directly to electricity and is an important source of renewable energy. The thermodynamic efficiency of a solar cell defines the ultimate limit of photoconversion and suggests strategies to achieve it. Recent progress in manufacturing, efficiency, and reliability has led to an astounding proliferation of the fixed-tilt single-junction PV technologies. The progress can be accelerated by a variety of innovative strategies (e.g., bifacial tandems, agro-PV, etc.). In a simple, single-line scaling formula, this paper unifies isolated and scattered results derived over the last 50 years and generalizes them to technologies whose thermodynamic limits are unknown. This work identifies promising concepts and their performance gain over traditional technologies.
Normalized US hurricane damage estimates using area of total destruction, 1900−2018
Authors: Grinsted Aslak , Ditlevsen Peter , Christensen Jens Hesselbjerg 
Published: November 2019

Significance
We present an approach to normalize hurricane damage, where damage is framed in terms of an equivalent area of total destruction. This has some advantages over customary normalization schemes, and we demonstrate that our record has reduced variance and correlates marginally better with wind speeds and pressure. That is, it allows us to better address climatic trends. We find that hurricanes are indeed becoming more damaging. The frequency of the very most damaging hurricanes has increased at a rate of 330% per century.
Responding (or not) to other’s talk
Authors: Burch Alfred Rue 
Published: November 2019

AbstractThis study followsIshida’s (2017)call for longitudinal studies that examine how learners in the early stages of their study abroad sojourn develop skills in responding to prior talk. Using multimodal Conversation Analysis (CA), the study compares three interactions across a six-week sojourn between a learner of Japanese and his host father. For longitudinal comparison, the study focuses on sequences in which the learner has initiated a question or comment, and the host father provides a non-minimal response. The study finds a diversification of resources and an expanded repertoire of possible actions for displaying recipiency, changing from primarily minimal response tokens that only weakly display his stance towards the prior talk early on, to the greater use of assessments and non-minimal expansions toward the end of the sojourn. The study provides evidence that short-term study abroad experiences for novice languages learners can afford opportunities for the development of interactional competencies.
Improving the physical properties of clay using Sinabung volcanic and rice husk ash with UCT and CBR
Authors: Hastuty I P , Roesyanto  , Andarai D S 
Published: November 2019

Abstract
Stabilization can be done by adding something to the soil in order to improve its strength and bearing capacity. One of the efforts to stabilize the soil is to add certain chemicals so that the soil will become solid. The additive materials used in this research are Rice Husk Ash (ASP) and Volcanic Ash (AGV) which is obtained from the eruption of Mt. Sinabung. The purpose of this research is to find index properties value as the effect of adding 2%, 4%, 6%, 8% Volcanic Ash and 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20% Rice Husk Ash on clay, to find the maximum compressive strenght value with UCT (Unconfined Compression Test), to find the CBR (California Bearing Ratio) value as the effect of adding the stabilization agents, and also to find the optimum content of adding Rice Husk Ash. According to the result of this research, the soil has 34.43% water content, 2.65 specific gravity, 47.33% liquid limit, 29.88% plasticity index, and 1.42 kg/cm2 compressive strength. Based on the classification system of Unified Soil Classification System (USCS), this soil is included in the group of CL which is inorganic clay with low to medium plasticity. Meanwhile based on the classification system of American Association of State Highway and Transportation Officials (AASHTO), this soil could be classified as type of soil A-7-6. The highest compressive strength value is obtained from the addition of 8% Sinabung ash and 2% Rice Husk Ash which is 3.17 kg/cm and the optimum CBR value also obtained from the addition of 8% Sinabung ash and 2% Rice Husk Ash which is 8.53%.
Building a Semantic RESTFul API for Achieving Interoperability between a Pharmacist and a Doctor using JENA and FUSEKI
Authors: Sigwele T , Naveed A , Hu Y.F , Ali M , Hou J , Susanto M , Fitriawan H 
Published: November 2019

Abstract
Interoperability within different healthcare systems (clinics/hospitals/pharmacies) remains an issue of further research due to a barrier in sharing of the patient’s Electronic Health Record (EHR) information. To solve this problem, cross healthcare system collaboration is required. This paper proposes an interoperability framework that enables a pharmacist to access an electronic version of the patient’s prescription from the doctor using a RESTFul API with ease. Semantic technology standards like Web Ontology Language (OWL), RDF (Resource Description Framework) and SPARQL (SPARQL Protocol and RDF Query Language) were used to implement the framework using JENA semantic framework tool to demonstrate how interoperability is achieved between a pharmacy and a clinic JENA was used to generate the ontology models for the pharmacy called pharmacy.rdf and clinic called clinic.rdf. The two models contain all the information from the two isolated systems. The JENA reasoner was used to merge the two ontology models into a single model.rdf file for easy querying with SPARQL. The model.rdf file was uploaded into a triple store database created using FUSEKI server. SPARQL Endpoint generated from FUSEKI was used to query the triple store database using a RESTFul API. The system was able to query the triple store database and output the results containing the prescription name and its details in JSON and XML formats which can be read by both machines and humans.
Computational Analysis of Water Wheel for Hydro-Electric Power
Authors: Tulus  , Marpaung T.J. , Suriati  
Published: November 2019

Abstract
The flow of water in the river is one of shallow water flow that has many benefits. One of them is as a power plant that uses a water wheel. Where the water wheel is used utilizing the flow of water in the river. The flow of water in the river in this study has a speed of 1.2 m/s. In the completion of this research, the finite element method in numerical approach is used to analyse the velocity of fluid motion in the river. Where speed inflow can affect electricity production. In the process, this research uses simulation with a software that works based on finite element method that is COMSOL Multiphysics 5.2 in two-dimensional form. The simulations are performed in two-dimensional flow, all the particles are thought to flow in the plane along the flow so that no flow is perpendicular to the plane. The simulation is carried out for 10 seconds and based on three variations of the water wheel height based on the center point of the water wheel is 1 m, 1.25 m and 1.5 m. Of the three variations, the fastest speed is at 1 m with maximum discharge is 34.6 m/s
Analysis of The Influence of Loading Variations Toward Brushless Direct Current Motor Performance on KARLING Electric Vehicle
Authors: Garniwa I , Nugroho M V , Noorfatima N , Sudiarto B , Orlando G 
Published: November 2019

Abstract
One type of electrical motors often used for electric vehicle purposes is Brushless Direct Current Motor (BLDC Motor). BLDC motor performance can be seen from its current line, electromagnetic torque, rotational speed, induction voltage, and input power as the parameters. The research’s aim is to find out the effect of loading towards BLDC motor performance on the electric vehicle. The loading variations are used in the form of passenger weight and track characteristics variations. The variation of passengers’ weight is 55 kg, 78 kg, and 143 kg. In this study obtained line current value when the passengers load 143 kg is 41.52 A. Furthermore, the values of the electromagnetic torque and energy consumption in the same weight are 23.88 Nm and 0.06 kWh/km. To ascertain the effect of track characteristics variations to the motor parameter, variations of track characteristics are done in trajectory 0° and 1.25°. The outcome is the 1.25° tilted track has higher energy consumption but lower speed.
Analysis of the Effect of the Motor Temperature to Brushless Direct Current Motor Performance on KARLING Electric Vehicle
Authors: Garniwa I , Dipantara B , Nugroho M V , Sudiarto B , Noorfatima N 
Published: November 2019

Abstract
Indonesia is a country that has tropical climate with average temperature vary in between 27°C until 37°C. BLDC motor industry is not common in Indonesia so that has to be imported from another country mostly subtropical countries. BLDC motor is built according to subtropical characteristics. Therefore, BLDC motor performance is changing in Indonesia due to the temperature differences. The following methods are used in the study: laboratory experiment and field test using electrical vehicle. The temperature in laboratory is in range between 23°C up to 55°C. However the field temperature varies from 27.7°C and 34, 2°C. The increasing temperature inside the motor in laboratory and field experiments conducts modification of BLDC motor parameters. The rising motor temperature degrades the current and torque of motor, but increasing the rotation velocity of the motor.
The rheometric, mechanical and morphological properties of carbon black filled styrene butadiene rubber vulcanizates in presence of alkanolamide
Authors: Surya I , Ismail H 
Published: November 2019

Abstract
Properties of carbon black (CB)-filled styrene-butadiene rubber (SBR) vulcanizates include rheometric, mechanical and morphological in presence of alkanolamide were studied. The synthetic rubber was filled by CB at a settled loading at thirty parts per hundred rubber (phr). The alkanolamide was derived from ethanolamine and refined bleached deodorized palm stearin and it was incorporated into CB-filled SBR at one, three, five and seven phr. From the results, it was found that alkanolamide was a rubber chemical as a co-curing and plasticizing material. As a co-curing material, it reduced the times to cure and scorch of filled SBR vulcanizates. As a plasticizing material, it reduced minimum torque or viscosity but raised the elongation at break. The properties of torque difference, tensile moduli, hardness, tensile strength and resilience of CB-filled SBR vulcanizates were also raised due to the presence of alkanolamide. The presence of a five phr of alkanolamide was the optimum concentration for CB-filled SBR whatever was tested by morphological study. The fractured vulcanizate of CB-filled SBR with the five phr of alkanolamide demonstrated greatest surface roughness and matrix tearing.
Profile Characteristics of Biomachined Zinc
Authors: Istiyanto J , Adhitama G , Zulkarnaen B A , Whulanza Y 
Published: November 2019

Abstract
Biomachining is one of the alternative methods in micromachining, which is environmentally friendly and have high efficiency (eco-efficient). This method uses bacteria (this research used Acidithiobacillus ferooxidans), which can extract the metal by using oxidation-reduction reactions as a part of its life cycle. This study reports the characterization of the biomachining process using zinc (Zn) materials. Pattern making was done by the visible light maskless photolithography process using DLP (Digital Light Processing) projector, and the characterization was done by varying the biomachining time. Surface profile data and photos of the workpieces were obtained using ‘SURFCOM’ and ‘Dino-Lite’ microscope, respectively. The results of this study show the profile of the surface of biomachined zinc forms a valley shaped like, with the horizontal feed larger than the vertical feed, and for the depth, width, and surface roughness tend to increase, while for the material removal rate and specific material removal rate tend to decrease with the increase of biomachining time.
Production Of Activated Carbon From Chicken Feather As An Alternative Hydrogen Storage
Authors: Alhamidi A A , Partuti T , Rachmawati D 
Published: November 2019

Abstract
Hydrogen is a reactive gas that requires special storage. Porous material from activated carbon can be used as an alternative storage. Activated carbon is derived from materials containing carbon. Chicken feather is one of the materials that can be used for activated carbon. There are two forms of samples, powder and briquette. The activation process is done physically with variation temperature 200, 300, 400 and 600 °C, activation time 60 minutes and flow rate of nitrogen 0.2 L/min. Activated carbon is analysed by Fourier Transform InfraRed (FTIR), Brunauer-Emmett-Teller (BET) and Scanning Electron Microscope (SEM). Percent of carbon produced is 62.90 wt.%. The FTIR results show that bond of C-H appears at 641-1362 cm−1, C-C at 1442 cm−1, C=C at 1600-1657 cm−1, C≡C at 2130-2220 cm−1. The result of BET for powder samples is 137.147 m2/gr (200 °C), 0.133 m2/g (300 °C) and 0.000 m2/g (400 °C). While for briquette samples are 77.387 m2/g (200 °C), 0.369 m2/g (300 °C) and 2.629 m2/g (400 °C). The SEM results show that pores appear on the briquette sample are much more and more visible than the powdered samples due to the agglomeration, obtained 16.01% (200 °C); 0.88% (300 °C) and 5.69% (400 °C).
Facility Location and Multi Capacity Vehicles Model for Minimizing Emissions for Environmentally Friendly Logistics
Authors: Lathifah A , Sulistyo S R , Murti I W 
Published: November 2019

Abstract
Transportation and distribution are two things that are closely related to logistics problems. On the one hand, these two things are at the heart of an organization or company in terms of delivering goods sold to consumers. However, on the other hand this activity can sometimes damage the environment. Emissions from fuels used in transportation and distribution activities accounted for 29.4% of the total costs incurred by the organization in logistics activities. So that, many organizations finally make environmentally friendly logistics a priority in their activities, where the goal of minimizing distribution costs and maintaining sustainability of both environments can be fulfilled. Some factors that can be improved are the determination of the location of the warehouse or depot, the combination of vehicle composition and the optimum route. Therefore, this study aims to develop a mathematical model that will optimize these three factors in an integrated manner to minimize the fuel carried out by the organization in its distribution activities with the aim of realizing environmentally friendly logistics. The expected results from the study of this research is the contribution of theoretical studies namely mathematical models of the problems raised applied to the problem of determining the location, route and combination of vehicle capacity.
The loading effect of sugarcane powder on the tensile property of glass fibre/sugarcane powder/polymer hybrid composite
Authors: Savetlana S , Sugiyanto  , Nurpratama A A 
Published: November 2019

AbstractThe awareness of environment enhances the use of green and renewable materials. Glass fibre reinforced composite is a well known composite material. Utility of sugarcane fibre will decrease the use of synthetic fibre without losing the excellent of mechanical properties of glass fibre composite. In the experiment, the loading effect of sugarcane powder were 5,10 and 15 wt% and glass fibre were 5,10 and 15 wt%. The hybrid composite was simply prepared by hand lay-up method. The mechanical properties was characterized using tensile test. The result show that the tensile properties of composite increased with the addition of glass fibre and 1sugarcane powder. The rule of mixture was used to model the tensile property of composite.
Dynamic Study of Reactive Dividing Wall Column to Synthesis Dimethyl Ether from Methanol Using Aspen Plus Dynamics
Authors: Wiratama I G , Hudaya T , Ferdian  
Published: November 2019

Abstract
In chemical industry, control system is one of the most important things to ensure product quality and safety. In designing the control system, dynamics models in the form of transfer functions are required. In a complex process the transfer functions are derived from black box models, which the relationships between input and output variables are obtained from the dynamic data. One of the complex processes that can be found in the chemical industry is reactive dividing wall column distillation (RDWC). RDWC can be used to synthesis many chemical compound, one of them is dimethyl ether (DME). DME is chemical compound which has a high economic value for it is widely used as reagent in chemical industries. In distillation column, reboiler duty and reflux rate are usually become manipulated variable (MV) and products purities are usually become controlled variable (CV). So in this study, the MVs of RDWC were reboiler duty and reflux rate, and the CVs were purity of DME at distillate and purity of methanol at side stream outlet. The goals of this study were to find the transfer functions between CVs and MVs, as well as the values of the parameters of the transfer function. To achieve this goals, dynamic simulations of RDWC was carried out by series of step test using Aspen Plus Dynamics. It was found that the response of DME purity to reboiler duty and reflux rate was more sensitive and responsive than the response of methanol to reboiler duty and reflux rate; and the responses of DME and methanol purity to reboiler duty were more sensitive and responsive than their responses to reflux rate.