bluuebunny/crossref_metadata_2025_split huggingface dataset:
Impact of dust diffusion on the rim shape of protoplanetary disks
Authors: Schobert B. N. , Peeters A. G. 
Published: May 2021

Context. Multiple mechanisms are known to give rise to turbulence in protoplanetary disks, which facilitates the accretion onto the central star. Small dust particles that are well coupled to the gas undergo diffusion due to this turbulent motion.
Aims. This paper investigates the influence of turbulence-induced dust diffusion on the equilibrium of protoplanetary disks.
Methods. The model accounts for dust sublimation, radiative transfer with the flux-limited diffusion approximation, and dust diffusion. It predicts the density and temperature profiles as well as the dust-to-gas ratio of the disk.
Results. It is shown that dust diffusion can have a large impact: Assuming the dust survives for 104 s or longer before it can be evaporated, this leads the dust diffusion to widen the inner disk considerably. This effect is generated through a feedback mechanism as the diffusion length is much shorter than the disk width. With increasing dust diffusion, the inclination of the inner rim toward the stellar radiation becomes steeper until it is almost vertical. The temperature range of evaporation and condensation, which is linked to the dust composition, has no influence on this effect.
Conclusions. For realistic parameters, dust diffusion cannot be neglected when determining the equilibrium of the disk. Stronger turbulence inside the disk induces more dust diffusion. Therefore, the dust density grows more gradually over a greater distance and less radiation reaches the disk surface. The new equilibrium shape of the disk is more inclined toward the star. This effect is universal and independent of the specific dust composition.
Alterstraumatologische Netzwerke
Authors: Neuerburg Carl , Fleischhacker Evi , Keppler Alexander M. , Knobe Matthias , Liener Ulrich C. , Kammerlander Christian , Böcker Wolfgang 
Published: May 2021

ZusammenfassungInterdisziplinäre (alterstraumatologische) Behandlungsansätze finden eine wachsende Akzeptanz zur Therapie älterer unfallchirurgischer Patienten und haben zum Ziel, peri-/postoperative Komplikationen zu reduzieren und das Patientenergebnis zu verbessern. Zur Sicherung der Qualität und des bestmöglichen Behandlungsergebnisses von alterstraumatologischen Patienten haben sich national wie international einige interdisziplinäre Netzwerke etabliert, in denen Behandlungstandards in der Versorgung älterer Frakturpatienten diskutiert und fixiert werden. In dem vorliegenden Beitrag werden zunächst die wesentlichen Hintergründe sowie die sozioökonomische Bedeutung alterstraumatologischer Frakturen erläutert. Anschließend werden die bisher etablierten Netzwerke, Arbeitsgruppen/Fachgesellschaften mit alterstraumatologischem Fokus präsentiert und international geltende Vorgehensweisen anhand festgelegter Richtlinien demonstiert. Von besonderer gesundheitsökonomischer Bedeutung ist dabei die seit dem 1.1.2021 in Deutschland geltende GBA-Richtlinie Hüftfrakturen, welche für alle Krankenhäuser bindend ist. Somit soll die interdisziplinäre Versorgung älterer Hüftfrakturpatienten in Deutschland zukünftig in besonderem Maße nach aktuellem wissenschaftlichen Kenntnisstand in die klinische Praxis implementiert werden.
Copper/Di-tert-butyl Peroxide-Catalyzed Regioselective Hydroxyphosphorylation of 1,3-Enynes
Authors: Zhu Shaoqun , Wang Jiawei , Zhou Bing , Hou Hong 
Published: May 2021

AbstractThe copper/di-tert-butyl peroxide-catalyzed regioselective hydroxyphosphorylation of 1,3-enynes is described. The advantages of the reported radical reactions are excellent functional group tolerance, the use of a catalytic amount of copper and di-tert-butyl peroxide (
t
BuOO
t
Bu) as a radical initiator, and mild reaction conditions. The desired products are obtained in moderate to excellent yields after purification.
Vascularized Occipital Bone Grafting: Indications, Techniques, Clinical Outcomes, and Alternatives
Authors: Winocour Sebastian J. , Xue Erica Y. , Bohl Michael A. , Farrokhi Farrokh , Davis Matthew J. , Abu-Ghname Amjed , Ropper Alexander E. , Reece Edward M. 
Published: May 2021

AbstractSuccessful arthrodesis at the craniocervical junction and atlantoaxial joint can be more challenging than in other segments of the cervical spine. Different techniques for spinal fixation in this region have been well described, along with auxiliary methods to improve fusion rates. The occipital vascularized bone graft is a novel technique that can be used to augment bony arthrodesis in the supra-axial cervical spine. It provides the benefits of a vascularized autologous graft, such as accelerated healing, earlier fusion, and increased strength. This technique can be learned with relative ease and may be particularly helpful in cases with high risk of nonunion or pseudoarthrosis in the upper cervical spine.
Vascularized Posterior Iliac Crest Bone Grafting: Indications, Techniques, Clinical Outcomes, and Alternatives
Authors: Winocour Sebastian J. , Schultz Kelly P. , Davis Matthew J. , Abu-Ghname Amjed , Bohl Michael , Ropper Alexander E. , Maricevich Marco , Reece Edward M. 
Published: May 2021

AbstractPseudarthrosis is a feared complication of spinal fusion procedures. Currently, the gold standard in prevention or treatment of pseudarthrosis is placement of nonvascularized iliac crest bone autograft. While rates of fusion are significantly higher in patients with use of nonvascularized bone autografts than with allografts, patients who have previously failed lumbar arthrodesis or those at a high risk for pseudarthrosis may benefit from a more robust, vascularized bone graft with enhanced osteogenicity. In this article, we discuss the use of iliac crest vascularized bone grafts as an adjunct for high-risk patients undergoing lumbosacral spine arthrodesis.
Construction of virtual simulation teaching platform for elevator control
Authors: Chang Wanfeng , Zhang Qingyong , Xia Huiwen , Yang Yang 
Published: May 2021

Abstract
Aiming at the deficiencies of the PLC teaching and training platforms in various colleges and universities, in order to meet the needs of students to debug PLC programs in various application places, taking elevator control as an example, this paper uses virtual reality technology, visualization technology, and computer programming technology to design a virtual simulation teaching platform based on PLC elevator control. Students can run the virtual simulation platform on the web page, learn the relevant basic knowledge, understand the operating principle of the elevator, and use the ladder diagram language to program in order to achieve the purpose of learning PLC. The results show that students can write and verify PLC programs anytime and anywhere, which greatly reduces the cost of purchasing training equipment and improves learning efficiency.
An efficient use of electric power controller from MPPT solar charge
Authors: Mairizwan  , Anshari Rio , Dewi Wahyuni Satria 
Published: May 2021

Abstract
The use of the MPPT algorithm in harvesting solar cell energy has been developed by various methods and has been used in the market. The use of this system has high efficiency and is stable in harvesting and storing electrical energy. However, the use of solar cell energy has the problem of controlling excessive energy consumption by electrical equipment, causing problems in the system and shortening the life of the system. For this reason, a study was conducted to control the optimization of the MPPT system and the use of energy from solar energy storage. The method used is optimization of the MPPT system using microcontroller control and integrated with current limiting control for the output load. From the results of these studies, it is found that the power harvested from solar cells is at the maximum point and a balance between the stored power from absorption from solar cells with power consumption by electronic equipment. These results can increase the efficiency and effectiveness of the absorption and use of solar energy based on solar cells. With this balance, it will reduce the factors that cause system failure and ensure a long battery life
Preliminary investigation of boron nitride nanotubes as an active material of sunblock
Authors: Jonuarti Riri , Haryanto Freddy , Suprijadi  
Published: May 2021

Abstract
Boron nitride nanotubes (BNNTs) are investigated as an active material of sunblock. Both the optical calculations and the experimental measurements are performed in this present study. Optical calculation such as the dielectric function of BNNTs are calculated using the random phase approximation (RPA). While, the experimental measurements started with the preparation of sunblock gel samples containing BNNTs with a basic formula consisting of a mixture of carbopol 940 and triethanolamine (TEA). Then, the sunblock gel samples are examined using the UV absorption spectroscopy and the diffuse reflectance spectroscopy. Both the results of the optical calculations and the experimental measurements, show that BNNTs have good absorption in the ultraviolet region and good transparency in the visible light region. This preliminary investigation indicates that BNNTs has the opportunity to be further developed as an active sunblock material.
Seismic data interpretation for mapping the subsurface structure thickness of top and base parigi formation, Konro field, northern West Java basin
Authors: Rafiandi R , Indriani R F , Mariyanto M 
Published: May 2021

Abstract
The Northern West Java Basin is one of the basins which has been proven to have oil content. In the exploration stage, we need an effective method in providing a description of seismic cross section model of the subsurface conditions of a study area. This study aims to map the thickness of the subsurface structure of the Parigi formation and understand the interpretation of seismic data in the time and depth domain. Seismic cross section has interpreted to determine the location of the alleged potential for hydrocarbon accumulation. In this study we focus on the top and base Parigi formation and obtain subsurface structure map in the time and depth domain. We use time to depth conversion (velocity interval method) to map the subsurface structure thickness. The results of the study show that there is anomaly built up which has potential as a gathering place for hydrocarbon on Parigi formation. The difference in thickness between the top and base Parigi is indicated by the differences in appearance of the structure map. The depth range shown on this map is around 1850ft-2135ft. So that the thickness of the Parigi formation in the study area is 285ft.
Skin temperature monitoring with an instrument infrared sensors measuring based on direction and distance
Authors: Jhora Fadhila Ulfa , Mairizwan  
Published: May 2021

Abstract
Skin temperature represents human body temperature. Measurement of body temperature aims to detect body organs changes activity, including fighting bacteria or viruses in the human body. Measurement of non-contact/long-distance body temperature is an important requirement during the Covid-19 pandemic. Based on this background, the development of long body temperature remote based on an Infrared Array SensorGrid-EYE sensor was conducted through microcontroller control. Variable of experiments to measure body temperature were distances and the inclined angle of the skin surface. The method of designing skin temperature monitoring glasses begins with three main stages process. The first process of understanding and analyzing the characteristics of solar cells, the process of measuring the energy of these solar cells. The second process involves designing and manufacturing electronic systems. The third process is by conducting an experimental experiment on temperature detector glasses. The components of this temperature detector system generally consist of infrared-based temperature sensors, signal conditioning circuits, microcontrollers, and were equipped with software that makes easy controlling. The results of the experiment showed the accurate measurement with a maximum distance up to 4 meters could monitor the skin temperature of human body with percentage error 0,18%. More than distance 4 meters, the ability of sensors was not accurately to monitor skin temperature of human body.
3D modelling using structure from motion technique for land observation in Kelok 9 flyover
Authors: Razi Pakhrur , Sumantyo Josaphat Tetuko Sri , Ali Shadiq , Aminuddin Jamrud , Kurniawan Farohaji , Putra Rusnardi Rahmat , Octova Adre , Jefriza  
Published: May 2021

Abstract
In a modern survey, information on the real condition of the study area is required to support the analysis and interpretation result of a study. However, obtaining information on the real condition in a wide covered area is difficult, particular in an area that hard to access and has varied topographic. The method that can imaging the real condition of a study area is observation using UAV/drone using structure from motion technique. Besides can be observed with a wide area, the detailed condition of the area also can be visualized. Structure from motion (sfm) is the technique that determines the spatial and geometric relationship of the target area through the movement of the camera. In this research, the sfm technique was applied to create the 3 dimension construction of the Kelok Sembilan flyover. The result show, 3D construction has a high spatial resolution in 2.99 cm/pixel measured in Ground Sampling Distance (GSD). Meanwhile, the horizontal relative resolution is 5.97 cm, and the vertical relative resolution is 8.95 cm.
Association structure and solubility dynamic of methyl red and methylene blue in the system of water, sodium dodecyl benzene sulfonate and pentanol
Authors: Putra Ananda , Mahda Atia , Nizar Umar Kalmar , Deskiberi  , Amran Ali 
Published: May 2021

Abstract
The purpose of this study was to determine the association structure, solubility, and homogeneity of methyl red and methylene blue in the system of water, sodium dodecylbenzene sulfonate (SDBS), and pentanol system, and to analyze the morphology of the association structure before and after dissolved in methyl red and methylene blue. The mass ratio composition of water/SDBS/pentanol system at pH 4.5, 7, and 9.5 selected from created Terner phase diagram to obtain the association structures. From the obtained association structures, the solubility of methyl red at pH 4.5 and methylene blue at pH 7 and 9.5 was analyzed. The homogeneity of methyl red and methylene blue was determined by the refractive index. The results showed that two association structures namely microemulsion (water in oil (w/o) and oil in water (o/w)) and lamellar liquid crystal phase was obtained. The maximum solubility of methyl red was found in w/o microemulsion. Meanwhile, the maximum solubility of methylene blue was found in o/w microemulsion. Refractive index results showed that mostly methyl red and methylene blue dissolved in the sample homogeneously. The structure of the liquid crystal microemulsion changed after the addition of methyl red and methylene blue observed by the Optical Polarizing Microscope.
Analysis of need for development of physics teaching materials assisted by a learning house portal integrating STEM and contextual models to improve student digital literacy
Authors: Laila Rahmi , Asrizal  
Published: May 2021

Abstract
The Industrial Revolution 4.0 in the 21st century is closely related to technological development. Currently the development of science and technology is moving continuously. With this basis, education should be able to develop superior knowledge, skills, attitudes, and values to deal with the industrial revolution 4.0. Currently the world is facing a big problem, namely the corona virus. Indonesia is among the countries that have found many positive cases of the corona virus. The government is making efforts to reduce the spread of the corona virus by carrying out social restrictions. The government makes regulations to work from home. In the world of education known as online schools. Physics Learning uses various types of teaching materials. Teaching materials integrating STEM which can be accessed by teachers and students anytime and anywhere, will assist students in answering challenges in the 21st century and responding to online schools. The purpose is to describe the STEM components contained in the XI grade XI high school physics teaching materials. The method is descriptive method with data collection instruments namely observation sheets. The results of the analysis of teaching materials show that science and mathematics indicators are more dominant in Physics teaching materials, but indicators of engineering and technology have not been seen. Thus, the existence of Physics teaching materials integrating STEM has not been maximized, therefore it is necessary to design a teaching material integrating STEM in Physics learning.
Analysis of contextual-based physics textbook development on static fluid materials for 21stcentury skills learning
Authors: Oktrisma Yesni , Ratnawulan  
Published: May 2021

Abstract
The curriculum education 2013 requires all subjects that contribute to the assessment of attitudes, knowledge and skills. One the of subjects in the high school that contributes to this is learning physics, as the concept expected in 21st century skills learning. 21st century skills learning is learning that integrates literacy skills, knowledge skills, skills and attitudes as well as mastery of technology. The preliminary study is to analyze the development of physics textbooks with the theme of static fluids using a contextual-based model on 21st century skills learning, which is used to spur students to find and apply various learning concepts, especially learning 21st century skills. based on contextual on static fluid material for 21st century skills learning. So that we can see the learning outcomes from the analysis of the contextual-based physics textbook development. The method used is development (Research and Development R & D). Research and Development is a research method used to produce products and test the effectiveness of these products. The product produced and tested is a contextual-based student textbook with static fluid material to improve 21st century skills learning. Analysis of teaching materials can be in the form of textbooks used by students so that learning has increased considerably.
Design of edupark bukik chinangkiek’s physics e-book with a scientific approach
Authors: Lestari Nila Virgo , Rifai Hamdi 
Published: May 2021

AbstractAlam takambang jadi guruis a Minangkabau philosophy that suggests to us that everything in nature can be used as a learning resource, one of them is Bukik Chinangkiek. In the preliminary research, it was known that there are many physics concepts in Bukik Chinangkiek edupark, but they have not been packaged into the form of learning materials. Very rapid technological advances have changed the all-digital life, so learning materials must follow the times, namely in digital form or e-book. The aim of this research is to produce a edupark Bukik Chinangkiek’s physics e-book with a scientific approach to the valid. This type of research was a design research using a plomp development model in the prototyping phase. The validity test of the physical edupark e-book used a validity questionnaire to three experts with different expertize. The data analysis technique used a Likert scale with the Aiken’s V formula. The conclusion of this research was that the edupark physics Bukik Chinangkiek’s ebook developed was valid for use as learning material in schools.
The practicality of interactive multimedia integrated science based on guided inquiry with theme energy in the life that integrates of learning for the 21st century
Authors: Ariani Rizka , Ratnawulan  , Fauzi Ahmad 
Published: May 2021

Abstract
This research discusses the practicality of Integrated Natural Science interactive multimedia in the learning process with the theme of energy for grade VII students in junior high schools. Interactive multimedia is designed using a guided inquiry model where in its design interactive multimedia is also integrated with 21st century learning. To see the level of practicality of this interactive multimedia, small and large group trials were conducted using instruments in the form of validated and distributed questionnaires to teachers and students. The results showed that the practicality level of Integrated Science interactive multimedia from teacher and student responses to the use of Integrated Science interactive multimedia in the learning process was in the practice category. So it can be seen that the use of integrated science interactive multimedia based on guided inquiry with the theme of energy in the integrated life of 21st century learning is practically used in learning.
Validity of science edupark e-book based on scientific approach on the national geopark of ranah minang silokek, Indonesia
Authors: Ummah Khairul , Rifai Hamdi 
Published: May 2021

Abstract
The background of the design and manufacture of the e-book is a follow-up to the preliminary research. Based on preliminary research revealed: first, there is no learning tool related to regional potential. Second, learning tools are not based technology yet. Third, there are many facts, principles and concepts of science in The National Geopark of Ranah Minang Silokek. The purpose of this study is to produce a valid quality Science Edupark E-Book based on material substance, presentation feasibility, appearance feasibility, and language. This e-book is designed based on the 2013 curriculum by containing the scientific approach steps. This research uses the Plomp development model in the development phase and the Prototyping phase. Data collection is taken by a questionnaire technique. Validation is carried out through an e-book validation instrument sheet by three experts, containing material substance, feasibility of presentation, feasibility of display, and language. The data analysis technique used is the Likert scale and the validity value by using the Aiken’V formula. This research results in an e-book with valid criteria. The conclusion of this research is the e-book that is made is suitable as a source of learning science in junior high school.
Implementation of think pair share model in physics learning to determine cognitive, affective and psychomotor learning outcomes and student responses
Authors: Astra I M , Henukh A , Algiranto  
Published: May 2021

Abstract
The purpose of this research is to describe the results of the implementation of the think pair share model on optical concepts that includes cognitive, affective, psychomotor learning outcomes and student responses. The type of this research is descriptive research. This research was conducted in class VIII THB Junior High School, Bekasi. The research design used was one group pretest-posttest design. Data collection techniques used were observation, tests, and student response questionnaires. The analysis technique of the research results used is quantitative descriptive analysis including the calculation of proportions and percentages. Based on the results of data analysis, cognitive, affective, and psychomotor learning outcomes are achieved with an average achievement of the cognitive proportion of 0.85, affective proportion through observation of 0.83, and the proportion of psychomotor through a portfolio of 0.82. Student responses to the implementation of learning by implementing a think pair share model that includes five aspects are very good, with an average percentage of the five aspects is 90.53%. Based on the data above, it can be concluded that the implementation of the think pair share model can improve students’ physics learning outcomes.