bluuebunny/crossref_metadata_2025 huggingface dataset:
Wire and Arc Additive Manufacturing with TiC-Nanoparticle Reinforced AA5183 Alloy
Authors: Langelandsvik Geir , Ragnvaldsen Olav , Flåm Jan E. , Akselsen Odd M. , Roven Hans J.
Published: November 2020

Wire and arc additive manufacturing of aluminium-ceramic composites shows great potential to produce high strength materials. By incorporation of nanoparticles in the feedstock wire, fine-grained material with low susceptibility for solidification cracking and enhanced strength can be obtained. In fact, this study utilised the novel screw extrusion method to prepare an aluminium alloy containing TiC nanoparticles. The commercial aluminium alloy AA5183 was selected for WAAM to assess and benchmark the effects of screw extrusion and TiC. The materials have been assessed in terms of microstructure, porosity content and mechanical properties. The presence of TiC reduced the average grain diameter by 70%, while Vickers hardness increased with 13%. However, number of pores per unit volume increased by one order of magnitude. The porosity is believed to stem from hydrogen introduced in the AA5183-material through screw extrusion processing, in addition to hydrogen trapping and pore nucleation on TiC nanoparticles.
Influence of the Mg and Bi content on brazeability of MONOBRAZE material under flux-free brazing conditions
Authors: Phumprasop Kanokploy , Yamamoto Dai , Yamada Noriyuki , Tanaka Hirokazu
Published: November 2020

In the conventional brazing, the clad materials with the filler layer and the flux coating have been used to get good brazeability. However, an innovative Al-Si based single-layer brazing material (MONOBRAZE® material) has been developed recently which does not need filler layer by supplying molten filler from the inside of the material during brazing. In addition, a new flux-free brazing technique has also been developed. In the flux-free brazing, Mg and Bi are added to break the oxide film and to improve the wettability of molten filler, respectively. However, it is not clarified how these element works on the brazeability of MONOBRAZE® material in flux-free brazing. Therefore, in this study the effect of Mg and Bi content on the brazeability of MONOBRAZE® material was investigated. From the result, it is found that MONOBRAZE® material is applicable for flux-free brazing by adding Mg. Mg is considered to break the oxide film into fine particles and Bi is considered to assist the destruction of oxide film. From this cause, a new aluminum substrate surface was exposed which allow molten filler to move on the surface and contribute to the formation of the fillet.
Zum Schreibenlernen motivieren – Foto-Interview
Authors: Wolf Maria
Published: November 2020

Der 7-jährige Leon kommt mit seiner Mutter zur Ergotherapie. Die Mutter wünscht sich, dass er besser schreiben lernt. Leon lehnt das ab. Er würde am liebsten den ganzen Tag Motorradfahren spielen. Ergotherapeutin Maria Wolf schildert, wie sie Leon mithilfe des Foto-Interviews zum Schreibenlernen motiviert. Ein Fallbericht.
Mut zum Wandel – Digitale Medien in der Ergotherapieausbildung
Authors: Klein Claudia
Published: November 2020

Claudia Klein ist Dozentin an einer Berufsfachschule für Ergotherapie und dort unter anderem verantwortlich für den Bereich „Digitale Medien“. In diesem Rahmen stellte sie sich die Frage, welche Kompetenzen die Lehrenden im Umgang mit digitalen Medien besitzen und welchen Stellenwert die Digitalisierung in Ausbildung und Studium einnimmt.
The Ductus Venosus
Authors: Born Markus
Published: November 2020

Background the ductus venosus (DV) is not well known in general radiology, but it plays a role in the daily work of pediatric radiologists. Consequently all general radiologists who also care for a pediatric department should be familiar with the physiological and pathological findings related to the DV. Methods: Literature research in Medline, using the keywords “ductus venosus” and “umbilical vein catheter”.

Results and conclusions In the first weeks of life the DV is regularly still patent. It should be recognized as DV and not be mistaken for a pathological portosystemic shunt.The ductus venosus is the lead structure for umbilical vein catheters. Radiologists should be able to assess the correct catheter position. Radiologically important findings of an umbilical vein catheter are mainly malposition and intrahepatic extravasation. Agenesis of the DV can lead to intra- or extrahepatic compensatory portosystemic shunts, in which as well as in the case of persistent patency of the DV, there may be the necessity for radiological-interventional or surgical occlusion.

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Citation Format
Lehren aus Corona: Helios setzt auf Spezialisierung
Authors: Guntram Doelfs
Published: November 2020

Schon vor Corona zentralisierte Helios Therapien an ausgesuchten Klinikstandorten. Nach den jüngsten Erfahrungen mit der Pandemie sieht sich Deutschlands größter privater Klinikkonzern in der Strategie bestätigt und beschleunigt den Aufbau. Für Patienten bedeutet das mehr Qualität – und weitere Wege.
Klinik Unternehmen: Auf-/Absteiger des Monats
Authors: Schmidt Hartmut
Published: November 2020

Börsenexperte Hartmut Schmidt analysiert für kma die Jahresabschlüsse ausgewählter Kliniken
Elektronische Kommunikation: MDK-Reformgesetz forciert Digitalisierung
Authors: Völke Steven , Paul Oliver
Published: November 2020

Das MDK-Reformgesetz definiert die Beziehung zwischen Medizinischem Dienst (MD) und den Krankenversicherungen (KV) neu. Das schärft die organisatorische Trennung beider Institutionen und stärkt damit die Unabhängigkeit des MD. Zudem wird die korrekte Behandlungsdokumentation für Kliniken in Zukunft noch wichtiger.
Healing Architecture: Mit Räumen heilen
Authors: Kohrs Jens
Published: November 2020

Tanja C. Vollmer verändert Krankenhäuser. Der Ansatz der Architekturpsychologin soll vor allem den Stress der Patienten senken – und letztlich helfen, dass sie gesund werden.
Haftungsrisiken bei Hackerangriff: Effizientes Risikomanagement ist Chefsache
Authors: Orthwein Matthias
Published: November 2020

Wenn Cyberkriminelle zuschlagen, kann dies katastrophale Auswirkungen auf den laufenden Betrieb im Krankenhaus haben. Dies musste gerade das Universitätsklinikum in Düsseldorf erfahren. Der Fall verdeutlicht, dass digitale Erpressung nicht nur Datenschützer und IT-Abteilungen betrifft. Sie zu bekämpfen, muss auch im Klinikbereich Chefsache sein.
Krankenhausmanagement: Lieber gemeinsam und auf Augenhöhe
Authors: Doelfs Guntram
Published: November 2020

Ökonomen haben die Klinikfinanzen im Blick, Mediziner die Behandlungsqualität – so lautet eine weitverbreitete Sichtweise. Ob das ein überholtes Klischee ist, warum hauptamtliche Professionalität auf beiden Seiten ein Muss ist und Profilneurosen einzelner Vorstände den Erfolg des gesamten Vorstandes gefährden, erzählen die Vorstände der Uniklinik Essen, Prof. Jochen Werner und Thorsten Kaatze, im Interview.
Femtosecond spin voltage measurement helps pull spintronics into the ultrafast domain
Authors: Patrick Chris
Published: November 2020

Observing a shift in the chemical potential of one spin direction after ultrafast demagnetization allows authors to determine the magnitude of a femtosecond spin voltage.
How stimuli-responsive materials can enable new technologies
Authors: Lim Alane
Published: November 2020

Researchers have reviewed the stimuli-responsiveness of liquid crystal films and discussed how this behavior can be used for soft robotics and other exciting applications.
Design of metasurfaces to enable shear horizontal wave trapping
Authors: Su Yu-Chi , Chen Tungyang , Ko Li-Heng , Lu Meng-Hsueh
Published: November 2020

We propose a simple method to design a wave trapping mechanism, referred to as an elastic open cavity, for shear horizontal waves using the concept of metasurfaces. Conventional open cavity designs have utilized bulk metamaterial media with negative refractive indices at certain frequencies. Here, we show that wave trapping can be attained depending on the incident angle with a suitable design and arrangement of several metasurfaces. This design strategy can be applied to waves with various incident angles and frequencies. We show that the incident angles and the number of metasurfaces are closely related. In addition, connections between the characteristic length of the metasurfaces and the resonance frequency are discussed. As an illustration, we theoretically derive the wave fields for an elastic open cavity with six metasurfaces. Numerical simulations based on the finite element calculations are performed to verify the correctness and consistency of the theory. Instead of using reflecting walls to localize energy, this wave trapping mechanism stores mechanical energy via constructive interference by guiding wave fronts that travel around closed contours. The demonstration of this concept could be a potential guide to design new energy harvesting devices.
Particle distribution functions at plasma–surface interface
Authors: Costin C.
Published: November 2020

Particle simulations of bounded plasmas require assumptions on the distribution function of the incoming particles at the plasma–surface interface. Two independent distributions are usually defined, one angular and one energy dependent, disregarding the unified distribution as a whole. In this paper, two types of angular distribution (isotropic and cosine-type) and three types of energy distribution (energy dependent, uniform, and mono-energetic) are compared in a correlated manner via the resulting velocity distribution functions. Examples of incorrectly defined angular distributions are included. Numerical algorithms are indicated for the generation of the discussed distributions. Calculations of the incoming average velocity of the particles, directed perpendicularly to the surface, show the effect of each distribution on subsequent calculations.
Electric field-driven microfluidics for rapid CRISPR-based diagnostics and its application to detection of SARS-CoV-2
Authors: Ramachandran Ashwin , Huyke Diego A. , Sharma Eesha , Sahoo Malaya K. , Huang ChunHong , Banaei Niaz , Pinsky Benjamin A. , Santiago Juan G.
Published: November 2020

Significance

Rapid, early-stage screening is crucial during pandemics for early identification of infected patients and control of disease spread. CRISPR biology offers new methods for rapid and accurate pathogen detection. Despite their versatility and specificity, existing CRISPR diagnostic methods suffer from the requirements of up-front nucleic acid extraction, large reagent volumes, and several manual steps—factors which prolong the process and impede use in low-resource settings. We here combine microfluidics, on-chip electric field control, and CRISPR to directly address limitations of current CRISPR diagnostic methods. We apply our method to the rapid detection of SARS-CoV-2 RNA in clinical samples. Our method takes about 35 min from raw sample to result, a significant improvement over existing nucleic acid-based diagnostic methods for COVID-19.
The near-boundary geometry of Einstein-vacuum asymptotically anti-de Sitter spacetimes
Authors: Shao Arick
Published: November 2020

We study the geometry of a general class of vacuum asymptotically anti-de Sitter spacetimes near the conformal boundary. In particular, the spacetime is only assumed to have finite regularity, and it is allowed to have arbitrary boundary topology and geometry. For the main results, we derive limits at the conformal boundary of various geometric quantities, and we use these limits to construct partial Fefferman–Graham expansions from the boundary. The results of this article will be applied, in upcoming papers, toward proving symmetry extension and gravity–boundary correspondence theorems for vacuum asymptotically anti-de Sitter spacetimes.
Absorption spectroscopy and Stokes polarimetry in a 87Rb vapour in the Voigt geometry with a 1.5 T external magnetic field
Authors: Ponciano-Ojeda Francisco S , Logue Fraser D , Hughes Ifan G
Published: November 2020

This paper provides details of a spectroscopic investigation of a thermal 87Rb atomic vapour. The experiment was conducted with an external magnetic field of 1.5 T in the Voigt geometry. Very good quantitative agreement between experimental data and theory is found for all four Stokes parameters—with RMS errors of ∼1.5% in all cases. From the fits to our experimental data a value for the magnetic field strength is extracted, along with the angle between the magnetic field and the polarisation of the light. The effects of the cell window birefringence on the optical rotation signals are characterised. This allows us to carry out precise measurements at a high field strength and arbitrary geometries, allowing further development of possible areas of application for atomic magnetometers.
First-principles calculations of Stark shifts of electronic transitions for defects in semiconductors: the Si vacancy in 4H-SiC
Authors: Bathen Marianne Etzelmüller , Vines Lasse , Coutinho José
Published: November 2020

Point defects in solids are promising single-photon sources with application in quantum sensing, computing and communication. Herein, we describe a theoretical framework for studying electric field effects on defect-related electronic transitions, based on density functional theory calculations with periodic boundary conditions. Sawtooth-shaped electric fields are applied perpendicular to the surface of a two-dimensional defective slab, with induced charge singularities being placed in the vacuum layer. The silicon vacancy (V
Si) in 4H-SiC is employed as a benchmark system, having three zero-phonon lines in the near-infrared (V1, V1′ and V2) and exhibiting Stark tunability via fabrication of Schottky barrier or p-i-n diodes. In agreement with experimental observations, we find an approximately linear field response for the zero-phonon transitions of V
Si involving the decay from the first excited state (named V1 and V2). However, the magnitude of the Stark shifts are overestimated by nearly a factor of 10 when comparing to experimental findings. We discuss several theoretical and experimental aspects which could affect the agreement.
Isotope shift of the 2s 2S1/2 → 2p 2P1/2,3/2 transitions of Li-like Ca ions*
Authors: Zhang Denghong , Zhang Fangjun , Ding Xiaobin , Dong Chenzhong
Published: November 2020

The mass- and field-shift parameters of the two 2s 2S1/2 → 2p 2P1/2,3/2 transitions in the Li-like Ca ions are calculated by using multi-configuration Dirac–Hartree–Fock (MCDHF) and the relativistic configuration interaction (RCI) methods with the inclusion of the transverse photon (Breit) interaction, vacuum polarization and self-energy corrections. In addition, the mass shift and field shift of these two transitions are calculated, where the field shift is calculated by using the evaluated value δ〈 r
2〉 obtained by [Atomic Data and Nuclear Data Tables
99 69 (2013)]. It is found that the mass shift of Li-like Ca ions is greater than the field shift.
Explanation of core ion cyclotron emission from beam-ion heated plasmas in ASDEX Upgrade by the magnetoacoustic cyclotron instability
Authors: Liu Lunan , Ochoukov R. , McClements K.G. , Dendy R.O. , Bobkov V. , Weiland M. , Bilato R. , Faugel H. , Moseev D. , Salewski M. , Zhang Wei , Zhang Xinjun , Zhu Yubao , Chapman B. , Zalzali A.
Published: November 2020

Bursts of ion cyclotron emission (ICE), with spectral peaks corresponding to the hydrogen cyclotron harmonic frequencies in the plasma core are detected from helium plasmas heated by sub-Alfvénic beam-injected hydrogen ions in the ASDEX Upgrade tokamak. Based on the fast ion distribution function obtained from TRANSP/NUBEAM code, together with a linear analytical theory of the magnetoacoustic cyclotron instability (MCI), the growth rates of MCI could be calculated. In our theoretical and experimental studies, we found that the excitation mechanism of core ICE driven by sub-Alfvénic beam ions in ASDEX Upgrade is MCI as the time evolution of MCI growth rates is broadly consistent with measured ICE amplitudes. The MCI growth rate is very sensitive to the energy and velocity distribution of beam-injected ions and is suppressed by the slowing down of the dominant beam-injected ion velocity and the spreading of the fast ion distribution profile. This may help to account for the experimental observation that ICE signals disappear within ∼3 ms after the NBI turn-off time, much faster than the slowing down times of the beam ions.
Control and Realtime Monitoring System for Mushroom Cultivation Fields based on WSN and IoT
Authors: Wajiran  , Riskiono S.D. , Prasetyawan P. , Mulyanto A. , Iqbal M. , Prabowo R.
Published: November 2020

In this article, it is explained the design of control and monitoring systems for many mushrooms cultivation fields (kumbung) in realtime based on Wireless Sensor Network (WSN) and the Internet of Things (IoT). This system is designed to control and monitor temperature and humidity parameters in each kumbung. The system consists of several node boards in each kumbung and master board. The main components of the node board consist of Arduino Uno which is connected to XBee, DHT22 sensor, actuator in the form of a sprayer-pump, a blower and lamp. The main components of the Master board are Raspberry Pi and Xbee. Data is sent from each node to the Master using the WSN network with data packages that contain temperature and humidity data with the ID of each kumbung. The master board sends all kumbung data through a WiFi network to the Firebase realtime database that can be monitored via a smartphone. Kumbung control is performed by an actuator at each board node. The actuator keeps the temperature betwen 26-29°C and the humidity betwen 70-90%RH for mushrooms in the phase of body formation. The results of this system prototype experiment show that the functionality of the system is running well, although there is an average error 0,465°C for temperature readings and an average error 2,67% for humidity readings. This error is still in the DHT22 working area based on the datasheet.
Experimental Study of Tidal Flat Formation on Coastal Peat
Authors: Adietama Genta Putra , Sutikno Sigit , Yusa Muhamad , Yamamoto Koichi
Published: November 2020

Tidal flat formation on the coastal peat is a unique phenomenon that has occurred at western part of Bengkalis Island, Riau Province, Indonesia. It was identified that coastal erosion problems have been occurring continuously during at least the last 30 years along the north part of Bengkalis Island. The materials have moved to the south part of Bengkalis Island, and sedimented as tidal flat. Research on tidal flat in the peatlands has not yet been developed, so this study aims to carried out an experiment study in order to understand the tidal flat formation on coastal peat. The method used in this study is a simulation of tidal flat formation with several wave variations. Simulations were carried out using laboratory experiments with coastal peat samples and sea water at the wave channel. The results show that the waves and the velocity greatly influence the tidal flat formation and its formation rate. In addition, the formation of peat tidal flat was also influenced by velocity settling of the peat particles. The energy for tidal flat formation was the minimum energy generated by waves, that cannot transport the particles move back by reverse flow.
Improving Prospective Elementary Teachers’ Mathematical Communication Skills with Active Learning Approach of MIKiR
Authors: Sari Intan Kartika , Putra Zetra Hainul , Alim Jesi Alexander , Mulyani Eva Astuti , Alpusari Mahmud , Hermita Neni , Wijaya Tommy Tanu
Published: November 2020

The purpose of this research is to reveal the implementing of an active learning approach ofMIKiRon prospective elementary teachers’ mathematical communication skills. This study was a quasi-experiment with pre-test and post-test one-group design. The participant for this study were 41 second-year prospective elementary teachers from a public teacher institution in Pekanbaru, Riau, Indonesia. The results of the study, it was found that the average pre-test score is 74.05 and an average post-test score is 82.51 from a maximum score is 100. The score increased by 8.46, with an overall average N-gain value of 0.34 with medium criteria. This study showed that the active learning approach ofMIKiReffectively improved prospective elementary teachers’ mathematical communication skills. This approach also provided opportunities for learners to discuss and understand mathematical contents better.
A Comprehensive Prototype Design of Hydroelectric Power Station for Floating-Cages Energy Resources
Authors: Fakhrudin Z , Irawan Dedi , Irfan Zul , Islami Nur
Published: November 2020

This paper reported the design of a prototype of hydroelectric power station integrated in floating cages which will permanently developed in crowded of floating cages in Kampar river. The prototype was successfully created by using acrylic material with the thickness of 5mm. The examination Results shows that the prototype was working normally resulting the average voltage of 2.5 volt. Three difference wheel diameters were used for testing, and it found that the electrical current was increases as the increment of the diameter size. A designed sensor system works based on a microcontroller for detecting the water flow velocity, from the observation, the flow was 2.42 m/s. Certainly this prototype is very useful for designing the hydroelectric power station in area of floating cages at Kampar river.
Recombinant Anti-Thrombin Production from Saccharomyces Cerevisiae: Large Scale Trends Based on Computational Predictions
Authors: Pacheco S , Niño L , Gelves G
Published: November 2020

Anti-thrombin III is a protein performing anticoagulant function by preventing coagulation process and currently it is used in critical Covid-19 patients. In the present research, recombinant anti-thrombin production at large scale is simulated using SuperPro Designer. Special emphasis was analysed for the elucidation of required unit operation at industrial scale. Saccharomyces cerevisiae yeast is fed with 50 g/L carbon source together with 1.9 g/L amino acids and 6.7 g/L nitrogenous yeast base. All yields are taken from current references. The process is divided in two stages: upstream and downstream. In upward flow a total 11.2 g/L of biomass is calculated. Subsequently, anti-thrombin extraction and purification strategies are proposed. Interestingly, a purified anti-thrombin protein is obtained at 312 mg/L. Based on the latter, the large scale plant proposed in this research can reach 26 vials/hour produced at a concentration of 250 mg. Also productivity and prefeasibility are evaluated and annual production of 205,920 anti-thrombin vials is calculated. Therefore, each vial has a production cost of 180 USD. Based on the authors knowledge, information regarding antithrombin large scale trends are scarce. That is why this is the motivation of this research to perform a computational estimate for the large scale operations involved for the anti-thrombin production.
Environmental Sanitation and Stunting (Study of the Role of Women in Stunting Intervention)
Authors: Saputri Rini Archda , Anggraeni Diana , Sujadmi  , Sopamena Nurlaila
Published: November 2020

Stunting is the major malnutrional problem in Indonesia. The prevalence of stunting toddlers in Indonesia is 30.8% in 2018, equivalent to around 7 million Indonesian toddlers. This condition is a threat to the quality of Indonesia's Human Resources (HR) in the future because stunted children have weak cognitive abilities and are vulnerable to disease so that they are at risk of low productivity in the future. Various attempts have been made by the government to reduce the prevalence of stunting, but the achievements generated are still far from the target. This study aims to review and analyze other dimensions of stunting alleviation interventions that have been the focus of the government, namely; the role, access, and control of women to the occurrence of stunting, a dimension that does not receive much attention because the issue of stunting has so far been more related to the dimensions of health, nutrition, and nutritional adequacy. The research method uses a qualitative approach with a gender perspective to see the role of men and (in this context specifically) women related to stunting. The analytical model used is the Moser method of gender analysis conducted at the grassroots / micro-level (household and community). The results showed that the role of women in a productive, reproductive, and social manner was very strategic and decisive towards the occurrence of stunting. However, to be able to carry out these roles to the maximum, strong access and control is needed for women. Support from policy, economic, social, cultural, and law are factors that are needed by women, both as mothers and expectant mothers to be able to carry out their roles optimally and fully. Thus, affirmative policies are needed that can support women's access and control so that the stunting rate can be reduced.
Interactive Multimedia Development on KPK and FPB Material
Authors: Alim J A , Sari I K , Alpusari M , Sulastio A , Mulyani E A , Putra R A , Hermita N
Published: November 2020

This development research aims to: 1) produce interactive multimedia learning products for prospective elementary teacher students in low grade mathematics courses; 2) determine the level of feasibility of the product being developed. The research method refers to the Allesi & Trollip development model which is grouped into three development steps, namely: a) planning; b) design, and c) development comprising components including standards, ongoing evaluation, and project management. This research produces interactive learning multimedia products in the form of Flesdis. The results of the product score validation criteria are very valid (workable).
Early Detection of Dengue Hemorrhagic Fever (DHF) using Feed Forward Neural Network with Gravitational Search Algorithm Optimization
Authors: Prasetyo Nur Azmi , Yasin Hasbi , Warsito Budi
Published: November 2020

Health is an important part of life, it is also an indicator for progress of country development. But, there are still some health problems found in Indonesia, one of it is dengue infection. Data from the Department of Health states that in 2016 there were 77.96 per 100,000 pupolation (201,885 cases) with mortality rate is 0.79% (1,585 death cases). Clinical symptoms of dengue infection is so resemble with some other fevers, then the right diagnosis is very needed. Feed Forward Neural Network (FFNN) can be used to do an early detection to Dengue Hemorrhagic Fever (DHF) sufferer with training process to the existing data. In this research, we experiment the Gravitational Search Algorithm (GSA) as the Optimation Method to find the optimal weights of the FFNN. We use the medical record data of DHF sufferers who are getting treatment at Tugurejo District Hospital, start from January 2016 to Desember 2016. The accuracy of this research is 0.73188.
The Behavior of People at Pekanbaru City Indonesia in the Use of Household Pesticides to Control Pest of Settlement
Authors: Sutikno Agus , Saputra Rachmad , Rasyad Aslim , Amin Bintal , Mahatma Radith
Published: November 2020

Most people in Pekanbaru City (92.86%) are involved in using pesticides to control household pests for over five years. Furthermore, the driving factors of this behavior include the availability of the market in the settlement vicinity and the lack of public knowledge, which leads to an improper utility that does not comply with the provision on the packaging label. This research is a descriptive study. The results showed the absence of compliance to stipulated provisions in the behavior of the Pekanbaru community regarding the use of household pesticides to control settlement pests. Hence, the reports show the daily use of pesticides, determined by pests' appearance in certain places within the house, while the container management was properly carried out by storing it in a special place and out of childrens’ reach. Therefore, there is an enhanced desire to use non-pesticide pest control methods in community settlement.
Image Classification of Pandawa Figures Using Convolutional Neural Network on Raspberry Pi 4
Authors: Wisnudhanti Kartika , Candra Feri
Published: November 2020

Pandawa is one of the stories in wayang show consisting of five figures: Yudhistira, Bima, Arjuna, Nakula and Sadewa. This research is using Convolutional Neural Network (CNN) and apply it on the Raspberry Pi 4 to classify the puppet figures. CNN is one of the methods that can be used for classification of image data that has more than two classes. The network architecture used can classify Pandawa figures, using 1000 dataset with a size of 100 × 100 consisting of 80% training data and 20% test data. The network architecture has 3 convolution layers and 3 hidden layers, as well as 1 layer output. The classification results on the training data have an accuracy rate of 97.88% while test data has an accuracy rate of 96.5%.
The Effect of Sugar Concentration and Time for Nypa Sap Fermentation into Acetic Acid using Acetobacter pasteurianus
Authors: Chairul  , Muria Sri Rezeki , Rohaya
Published: November 2020

Acetic acid is widely used in cosmetics, manufacturing chemicals, food additives, or in some countries used as drinks. So that the needs for acetic acid increase every year. Acetic acid can be produced by fermentation using raw nypa sap containing sucrose, glucose and fructose. Factors affecting the fermentation process are the substrate sugar concentration and fermentation time. The purpose of this study was to determine the effect of increasing sugar concentration, the effect of fermentation time on bioethanol concentration, and the effect of fermentation time on acetic acid concentration. The fermentation process was carried out in two stages, namely Bioethanol Fermentation using S. cerevisiae with variations in sugar concentration of 149 g/L and 202 g/L and fermentation time of 1,3 and 5 days. The bioethanol produced was continued by the acetic acid fermentation process using A.pasteurianus with variations of the fermentation time of 1, 3, 5, 7 and 9 days. The maximum conditions for acetic acid production were 202 g/L sugar concentration, 39.47 g/L bioethanol substrate, and the 9th day fermentation, at acetic acid concentration of 36.71 g/L and yield 71.37%.
Measuring Critical Thinking based Multimedia on Buoyant Force Concept: A Preliminary Design
Authors: Mahbubah K , Habibulloh M , Hermita N , Samsudin A
Published: November 2020

This study aims to develop critical thinking test (CTT) based multimedia to assess students’ critical thinking on buoyant force concept. The buoyant force has been developed utilizing ADDIE method with five stages which are analyze, design, develop, implement and evaluate. The respondent the third semester of the academic year 2020/2021 at the Program of science Education, Universitas Islam Lamongan. The ADDIE developing steps has been utilized to describe comprehensively from the stage of analysis program up until the evaluation stage. CT based multimedia has measured pre-service science teachers, indicator of critical thinking has high score is recognize the need for more information in drawing conclusions that got 25% and the lowest indicator is Predict the probability of event got 15%. Based on data analysis, it can be concluded that CT based multimedia could able to effectively measure pre-service science teachers’ critical thinking. The CT based multimedia has been developed by macromedia flash software.
The Effect of Street Vendors’ Activities in City Park on the Functions of Park as a Public Space
Authors: Rahman Boby , Noviani Aisa , Rosyadea Rizka
Published: November 2020

Park becomes an important element in a city development, according to its functions as an open space to support ecological, economic and social functions. One activity supporting a park in developing countries is the existence of street vendors. Such activity will result in troubles for many parties if it is not paid a good response to deal with. This study is aimed at examining the effect of street vendors on the functions of park as a public space. It used a qualitative methodology in addition to literature review analysis technique and content analysis to examine various case studies in big cities of Indonesia. The result is that street vendors’ activities have positive impacts on social and economy, but negative ones on ecology.
Penetration Resistance of Bengkalis’ Peat From Hand Cone Penetration Test
Authors: Yusa M , Koyama A , Yamamoto K , Sutikno S , Muhammad A , Qomar N
Published: November 2020

In situ soil investigation on peat is not easy due to its low bearing capacity and high compressibility. Traditional in-situ test such as cone penetration test (CPT) are quite heavy which make movability on peatland difficult and slow. This study described the measurement of peat penetration resistance using portable hand cone penetration (HCP) test. The location of this study is at Bengkalis’ Island. Visual observation and laboratory tests show that peat at the site, mainly, can be classified as sapric and low ash. Dry unit weights range from 1.06-1.54kN/m3 with specific gravity range between 1.19-1.81. HCP test show that penetration resistance range from 84-674kPa with majority of it is at 300kPa. Estimated unconfined compression test suggested soft to medium consistency. Equivalent penetration resistances of full CPT are between 110-910kPa. There is tendency that higher fibre content may increase penetration resistance.
Groundwater Flow Analysis at Coastal Peatland Area of Bengkalis Island Using Paper Disk Velocimeter (PDV)
Authors: Pribadi Muhammad Agung , Sutikno Sigit , Yamamoto Koichi
Published: November 2020

Bengkalis Island is an island with about 89% of its land area consisting of peatlands. Because of the land use conversion from peat swamp forest to plantation and shrubs, the island has experienced massive degradation, such as abrasion, subsidence and land fires. The abrasion at western area of Bengkalis Island has occurred since the last 30 years with an abrasion rate up to 30 m/year. The previous studies showed that this is because of unbalanced hydrological conditions. The more advanced research related to groundwater flow impact on degraded peatland in Bengkalis Island is important in order to understand the mitigation alternative. To study the groundwater flow on the peat coast of Bengkalis Island, this study used Paper Disk Velocimeter (PDV) for measuring at 2 monitoring wells. The measurements were carried out at a depth of 2 m and 5.5 m and a depth of 2 m, 3 m and 4 m for Well-1 and Well-2 respectively. All measurements were carried out for 3 times on different month. This research found that the groundwater slope dropped significantly near the coastal line. This made the groundwater discharge to the coastal area become higher that may cause failure on the coastal cliff. The failure was identified as the initial phenomenon of the abrasion mechanism in the Bengkalis coast.
Preliminary Investigation of Groundwater Resources in the Wetland Area, Dumai
Authors: Islami Nur , Irianti Mitri
Published: November 2020

The wetland area in Sumatra island is commonly covered by peatland with the varies depth. Most common problem faced in these areas is the groundwater resources of the shallow aquifer which are not safe for human consumption. In the other hand the wetland area near the coast are intruded by the seawater. This study is actually a preliminary investigation of the groundwater resources in the surrounded wetland area of Dumai city, Indonesia. In this preliminary study, the groundwater samples were collected and measured their in-situ physical characteristics. Furthermore, the groundwater in the shallow aquifer is contaminated by varies amount of seawater content that are indicated by the higher value of TDS. However, the sea level intrusion in the shallow aquifer is not directly correlated with the distance from the beach line. Generally, the groundwater is not safe for human consumption at the distance of 3-5 km from the beach line.
Lighting of Museums and Art Galleries
Authors: Piana E.A. , Merli F
Published: November 2020

A museum is a place where people can explore and learn the past, the present and the future of culture and science. Amongst the other technical systems, the lighting equipment must satisfy a number of requirements. For each project, lighting designers must face challenges in order to encompass the given specifications in a single lighting concept: protection of the artefacts, economic convenience, architectural constraints and, last but not least, the creative ambitions of the artist. This paper analyses the lighting environment of a real art gallery with the aim to identify a satisfactory solution in terms of enjoyment, artefact preservation and energy consumption. By means of a simulation software, suitable general and spot lighting devices are chosen to fulfil the requirements whilst avoiding damages to the artefacts, and lighting parameters are obtained to evaluate the proposed solution. The work shows that advanced LED technologies can be effectively used to modify a museum lighting environment and turn it into the classical gallery archetype.
Analysis of Ferroelectric Thin Film BaZr0.6Ti0.4O3with Annealing Temperature Increase Variations Using x-ray Diffraction
Authors: Dewi Rahmi , Hamzah Yanuar , Zulkarnain  , Krisman  , Rini Ari Sulistyo , Shahab Tengku Said Luqman Hussain
Published: November 2020

Ferroelectric is a dielectric material which has spontaneous polarization and has the ability to change its internal polarization using a suitable electric field. The aim of this research is to decrease the FWHM value and increase the crystal size so that the dielectric constant increases for capacitor applications. Thin film ferroelectric material of Barium Zirconium Titanate (BZT) with the composition BaZr0.6Ti0.4O3was prepared using the sol-gel method. The substrate used was FTO glass which has been treated etching and coated with BZT and in annealing at 800° C with annealing temperature increase of 5°C and 10°C. Samples were characterized using XRD with an angle interval of 2θ between 20° to 60°. The results of XRD characterization show that there were peaks indicating that there was a crystal structure. The resulting crystal structure was in a plane 100 at an angle of 2θ = 22.55°, a plane 110 at an angle of 2θ = 32.00°, a plane 111 at an angle of 2θ = 38.54°, and a plane 200 at an angle of 2θ = 47.64°. The resulting structure in this study was tetragonal where a = b = 3.955 and c = 4.266. The rate at which temperature rose had an effect on the peak of X-Ray diffraction. The FWHM value for 5°C was less than 10°C. This implies a greater density when annealing at 5°C. The crystal size values obtained with an increase in temperature of 5°C and 10°C in the 100 plane were 3.22 and 2.954, respectively. The crystal size was inversely proportional to the FWHM value where the small speed of the annealing temperature increase caused the crystal size to enlarge.
IV International Meeting of Mathematical Education
Authors: Parra-López H M , Vergel-Ortega M , Dueñas Ramírez L M
Published: November 2020

Sharing the motto “Mathematics is Everywhere” and its icon “The crane” symbolizes honesty, maturity, the judgment that ensures the growth of all in spite of unseasonable winds and integrity, the objective of the IV International Meeting on Mathematics Education (IV IMME) is to create and maintain a space that privileges and promotes the culture of mathematics, reflection, and discussion on education and the application of mathematics, statistics, its history, evolution and didactics, and its interrelationship with science. At the meeting, researchers, scientists, and mathematics teachers socialize research results, consolidate networks for the exchange of successful experiences, with the purpose of strengthening mathematics education at different educational levels, promoting innovation, and fostering the creation of educational policies, models, strategies, tools and techniques, in various areas of knowledge and encouraging students’ interest in research.

List of Organizing Committee International Scientist Committee National Scientific Committee are available in the pdf.
Adaptive control systems with linear regressor and parameter identification algorithm applied to a magnetic levitation system
Authors: Mesa F , Devia D M , Ospina R
Published: November 2020

Conventional regulators or controllers are used regularly in control engineering, however, there are limitations to their use. In this document we develop the essential mathematical concepts and expressions in the study of adaptive control techniques. To do this, we will initially make a brief deduction of the equations that are identified in a linear regressor control system, and also for the case of the parameter identification algorithm. Next, we will apply this control technique in a non-linear state space system for a magnetic levitation system, allowing us to conclude, among other things, that this technique makes the control more robust.
Assembly and performance study of a triple gas electron multiplier with a 55Fe source
Authors: Fuentes F , Gutiérrez R M , Pastrán C G , Catañeda L F
Published: November 2020

In this work, a process for the assembly of a standard triple Gas Electron Multiplier detector and the study of the main variables was made at the Universidad Antonio Nariño, Colombia, detectors laboratory. The triple gas electron multiplier was tested with Ar/CO2 mixtures in proportions of 70/30%, 80/20% and 90/10% using a 55Fe X-ray source (5.9 keV). The energy spectrum, energy resolution, effective gain and ionization rate were analyzed according to the applied voltage and the Ar/CO2 gas mixture. The Universidad Antonio Nariño, Colombia, triple gas electron multiplier detector obtained an energy resolution of up to 19% and an effective gain close to 104; where the detection efficiency is approximately 95%. These results were compared with other studies to check the triple gas electron multiplier performance.
Teaching the wave concept through problem-based learning
Authors: Gallardo Pérez H J , Vergel Ortega M , Rojas Suárez J P
Published: November 2020

The wave movements can be studied from autonomous work done by the student since they are processes in which he can appreciate and understand how the transmission of energy from one part to another without transfer of matter is. Problem-based learning constitutes a good alternative to study the concept of waves since it sequentially leads the student to structure the knowledge to use it in the context, to develop effective processes of reasoning, to develop self-directed learning skills and to motivate him/her to learn, together with the development of the capacity to work in a team and it favors the development of the mathematical physical thought. The research is developed from the multi-method methodological approach developing in-depth interviews to teachers and knowledge tests to students with the purpose of establishing both pre-knowledge and initial situations for structuring the pedagogical intervention and the evaluation of its results. The pedagogical intervention is structured on a quasi-experimental design in which the strategy of problem-based learning is applied to the teaching and learning of physics and is compared with the traditional methodology. The research allows us to conclude that applying the problem-based learning methodology to physics teaching, we obtain better educational yields than with traditional teaching, while it generates a greater motivation and a greater interest in learning. It also allows the student to integrate the knowledge into his or her context, visualize the usefulness of learning and apply knowledge to the solution of problems in his or her environment, in other words, it allows the student to achieve significant learning and therefore a development of mathematical physical thinking.
Using concept maps to understand mechanical physics concepts in high school students
Authors: Hernández-Suárez C A , Prada-Nuñez R , Gamboa-Suárez A A
Published: November 2020

The work presents a didactic proposal on the use of concept maps, for the understanding of mechanical physics. A didactic intervention based on Ausubel’s theory was applied with the following activities: design, implementation and application of workshops based on real physical situations, where the elaboration of concept maps is the central axis, under the quantitative paradigm of interpretative level and action research method. The informants were 43 tenth grade students from a public educational institution located in the Department of Norte de Santander, Colombia. The results obtained showed that the use of concept maps as a didactic intervention favoured the significant learning of classical mechanics concepts. It was evident that the participating students achieved reflective analysis about the resolution of problems about the concepts of mechanics.
Spatially and temporally coherent reconstruction of tropospheric NO2 over China combining OMI and GOME-2B measurements
Authors: He Qin , Qin Kai , Cohen Jason Blake , Loyola Diego , Li Ding , Shi Jincheng , Xue Yong
Published: November 2020

Tropospheric NO2 columns retrieved from ozone monitoring instrument (OMI) are widely used, even though there is a significant loss of spatial coverage due to multiple factors. This work introduces a framework for reconstructing gaps in the OMI NO2 data over China by using machine learning and an adaptive weighted temporal fitting method with NO2 measurements from Global Ozone Monitoring Experiment–2B, and surface measurements. The reconstructed NO2 has four important characteristics. First, there is improved spatial and temporal coherence on a day-to-day basis, allowing new scientific findings to be made. Second, the amount of data doubled, with 40% more data available. Third, the results are reliable overall, with a good agreement with Multi-AXis Differential Optical Absorption Spectroscopy measurements (R: 0.75–0.85). Finally, the mean of reconstructed NO2 vertical columns during 2015 and 2018 is consistent with the original data in the spatial distribution, while the standard deviation decreases in most places over Mainland China. This novel finding is expected to contribute to both air quality and climate studies.