bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design optimisation of an inductor‐integrated MF transformer for a high‐power isolated dual‐active‐bridge DC–DC converter
Authors: Bin Chen 
Published: June 2019

Medium‐/high‐frequency isolated power conversion systems are continuously evolving towards higher power densities. A comprehensive design strategy is required to find a medium‐frequency (MF) transformer design that maximizes efficiency and power density while complying with material, electrical, and temperature limits. The proposed approach takes the optimum size of winding conductor conducting harmonic currents into account. The influence of the winding interleaving configuration on the leakage magnetic field is discussed and a method to tune the leakage inductance in a transformer is proposed. A novel semi‐empirical expression providing an improved accuracy of an AC resistance factor is introduced. Two well‐known configurations of transformers utilised in MF high‐power applications are also investigated, namely shell type and core type. The design methodology is established based on the parameter sweep method, and many candidate solutions are enumerated and tested one by one to determine the solution set that satisfies various constraints. Two prototypes of 5 kHz/10 kW nanocrystalline‐based transformers are designed and manufactured. The results show that the natural‐cooled shell‐type prototype can reach a power density of 17.6 MW/m3 at an efficiency of 99.36%, and the natural‐cooled core‐type prototype can reach a power density of 14.2 MW/m3 at an efficiency of 99.33%.
High-resolution spectroscopic study of dwarf stars in the northern sky
Authors: Mikolaitis Š. , Drazdauskas A. , Minkevičiūtė R. , Stonkutė E. , Tautvaišienė G. , Klebonas L. , Bagdonas V. , Pakštienė E. , Janulis R. 
Published: June 2019

Context. New space missions, such as NASA TESS or ESA PLATO, will focus on bright stars, which have been largely ignored by modern large surveys, especially in the northern sky. Spectroscopic information is of paramount importance in characterising the stars and analysing planets possibly orbiting them, and in studying the Galactic disc evolution.
Aims. The aim of this work was to analyse all bright (V <  8 mag) F, G, and K dwarf stars using high-resolution spectra in the selected sky fields near the northern celestial pole.
Methods. The observations were carried out with the 1.65 m diameter telescope at the Molėtai Astronomical Observatory and a fibre-fed high-resolution spectrograph covering a full visible wavelength range (4000–8500 Å). The atmospheric parameters were derived using the classical equivalent width approach while the individual chemical element abundances were determined from spectral synthesis. For both tasks the one-dimensional plane-parallel LTE MARCS stellar model atmospheres were applied. The NLTE effects for the majority of elemental abundances in our sample were negligible; however, we did calculate the NLTE corrections for the potassium abundances, as they were determined from the large 7698.9 Å line. For manganese and copper we have accounted for a hyperfine splitting.
Results. We determined the main atmospheric parameters, kinematic properties, orbital parameters, and stellar ages for 109 newly observed stars and chemical abundances of Na I, Mg I, Al I, Si I, Si II, S I, K I, Ca I, Ca II, Sc I, Sc II, Ti I, Ti II, V I, Cr I, Cr II, Mn I, Fe I, Fe II, Co I, Ni I, Cu I, and Zn I for 249 F, G, and K dwarf stars observed in the present study and in our previous study. The [Mg I/Fe I] ratio was adopted to define the thin-disc (α-poor) and thick-disc (α-rich) stars in our sample. We explored the behaviour of 21 chemical species in the [El/Fe I] versus [Fe I/H] and [El/Fe I] versus age planes, and compared the results with the latest Galactic chemical evolution models. We also explored [El/Fe I] gradients according to the mean Galactocentric distances and maximum height above the Galactic plane.
Conclusions. We found that in the Galactic thin-disc [El/Fe I] ratios of α-elements and aluminium have a positive trend with respect to age while the trend of Mn is clearly negative. Abundances of other species do not display significant trends. While the current theoretical models are able to reproduce the generic trends of the elements, they often seem to overestimate or underestimate the observational abundances. We found that the α-element and zinc abundances have slightly positive or flat radial and vertical gradients, while gradients for the odd-Z element Na, K, V, and Mn abundances are negative.
Interest In and Practices Related to Gynecologic Oncology among Members of the Brazilian Federation of Associations of Gynecology and Obstetrics
Authors: Júnior Arilto Eleutério da Silva , Carvalho Jesus Paula , Derchain Sophie Françoise Mauricette , Rodrigues Angélica Nogueira , Moretti Renato , Cândido Eduardo Batista , Reis Ricardo dos , Santiago Aline Evangelista , Filho Agnaldo Lopes da Silva 
Published: June 2019

Objective The present study aims to obtain basic demographic information, the level of interest and of training in gynecology oncology among Brazilian obstetricians and gynecologists (OB-GYNs) to create a professional profile.
Methods An online questionnaire was sent to 16,008 gynecologists affiliated to the Brazilian Federation of Associations of Gynecology and Obstetrics (FEBRASGO, in the Portuguese acronym). We considered gynecologists dedicated to gynecologic oncology (OB-GYNs ONCO) those who self-reported that > 50% of their daily practice consists in working with women's cancer care.
Results A total of 1,608 (10%) of 16,008 FEBRASGO members responded. The OB-GYNs are concentrated in the southern and southeastern states of Brazil. Gynecologic oncology was considered the 8th greatest area of interest in gynecology among the OB-GYNs. A total of 95 (5.9%) of the OB-GYNs were considered OB-GYNs ONCO. Obstetricians and gynecologists are actively engaged in cancer care: > 60% of them dedicate up to 25% of their daily practice to oncology. The role of the physicians in screening and prevention, diagnosis, in the treatment of precancerous lesions, and in low complexity surgical procedures is notably high. Gynecologists dedicated to gynecologic oncology in Brazil have a heterogeneous, nonstandardized and short training period in gynecologic oncology. These professionals had a more significantly role in performing medium- and high-complexity operations compared with OB-GYNs (65.2% versus 34%, and 47.3% versus 8.4%, respectively).
Conclusion The role of OB-GYNs and of OB-GYNs ONCO appears to be complementary. Obstetricians and gynecologists act more often in screening and prevention and in low-complexity surgical procedures, whereas OB-GYNs ONCO are more involved in highly complex cases. Strategies to raise standards in cancer training and to encourage the recognition of gynecologic oncology as a subspecialty should be adopted in Brazil.
Laminar segregation of sensory coding and behavioral readout in macaque V4
Authors: Pettine Warren W. , Steinmetz Nicholas A. , Moore Tirin 
Published: June 2019

Significance
We show evidence of a division of labor between neurons recorded within the superficial and deep layers of visual cortex in sensory coding and behavior. Neurons within the superficial layers of extrastriate area V4 outperformed their deep layer counterparts in coding the shape of visual stimuli, both in latency and accuracy. In contrast, neurons within the deep layers outperformed their superficial layer counterparts in the coding of selective attention and the planning of eye movements, particularly the latter. The results suggest that a general pattern may exist across sensory neocortex.
The translation of Hans Christian Andersen’s fairy tales in China
Authors: Luo Xuanmin , Zhu Jiachun 
Published: June 2019

Abstract
Hans Christian Andersen’s fairy tales have been popular among Chinese readers since they were introduced to China
through translation a century ago. This paper studies the translation of Andersen’s fairy tales in China by focusing on prominent
Chinese translators of Andersen and their landmark translations. Regarding translation as a social activity, the author attempts
to interpret the behaviour of the translator in terms of the historical context in which it occurred, as well as the corresponding
ideology of literature. It is argued that the language styles and translating strategies adopted by the translators of different
ages have varied according to the translator’s understanding of the original works, his purpose of translating, the publishers’
interests and the readers’ expectations in the target culture, as well as the image of Andersen constructed in the socio-cultural
context from which the translation emerged. Therefore, the translation practice, which has contributed to the canonization of
Andersen in China, is a process of the translators’ negotiations with the fluid Chinese poetics and ideology of the 20th
century.
3D particle tracking using a dual-objective fluorescent reflection system with spherical aberration
Authors: Liu Xiaolan , Wang Baoju , Yao Longfang , Fei Yiyan , Mi Lan , Ma Jiong , Yang Weidong 
Published: June 2019

Abstract
It is often difficult to implement complex microscopy systems without spherical aberration. Herein, we developed a novel, robust, three-dimensional (3D), bifocal plane, single-particle tracking technique, based on a dual-objective fluorescent reflection system with spherical aberration (DOFR–SA). It can simultaneously image a pair of focused and defocused planes containing fluorescent particles with a single camera instead of splitting photons into two channels. Based on the 3D DOFR–SA, the desired position accuracy along the z-axis was achieved without compromising the precisions of the (x, y ) positions, even with limited number of photons from a single molecule. Accordingly, this method was applied to fluorescent particle tracking in biofluids and living cells with high-spatial and temporal precisions.
Improving Students’ Conceptual Understanding of Biology through Quipper School
Authors: Wardyaningrum Ayu Ratri , Suyanto Slamet 
Published: June 2019

Abstract
Learning difficulties of students in understanding human physiology concepts are caused by the abstract objects because the physiological process occurs inside the human body. The condition causes the student learning outcomes become low. In order to overcome the problem, Quipper School, as an online-based learning media, is develop as a medium. It has various interesting features that facilitate students learning meaningfully and support student learning. This research aims to improve students’ conceptual understanding of biology through Quipper School. This research was conducted at SMA Negeri 2 Ngaglik and SMA Negeri 1 Prambanan in 11th grade, using quasi-experiment method, pretest-post-test nonequivalent control group design. Data were collected by using test instruments and analyzed by using normalized gain score and different test with Mann-Whitney U Test. The normalized gain score results showed that both the control and experimental classes increased in the conceptual understanding with medium category, namely of 0.38 and 0.62, respectively. The different tests results indicated that there was a very significant difference between increasing the understanding of science concept in two sample classes, with a significance value of 0.000. Thus, it could be concluded that the use of Quipper School was effectively in improving students’ understanding of scientific concepts.
Development and Testing of Biology Learning Multimedia Effectiveness
Authors: Hartoyo  , Abdul Gafur D. 
Published: June 2019

Abstract
This study aims to develop interactive multimedia learning based on Adobe Flash with the nervous system material to determine the level of product feasibility and the effectiveness of learning outcomes of students of class XI MAN 1 Maluku Tengah. This research method is Research and Development refering to the steps of the ADDIE development model. The product in the form of files in the .exe format, so the product can be directly used on many types of computers without the need to install the Adobe Flash CS6 program. Product testing consists of an alpha test and a beta test to determine the level of product feasibility and test the effectiveness of products on student learning outcomes. Data collection techniques used means of interviews, questionnaires, and tests. The data that have been collected were analyzed by qualitative descriptive technique. The results showed that the products developed were suitable for learning based on alpha testing and beta testing with very good and effective results to improve student learning outcomes with moderate criteria.
The Effect of Problem based Learning Model and Concept Map Strategy for Problem Solving and Understanding of the Ecosystem Concept of High School Students
Authors: Aritia Ela , Suyanto S 
Published: June 2019

Abstract
This research has purposes to: (1) determine the effect of PBL on problem solving and concept understanding of high school students, (2) determine the effect of Concept Map on problem solving and concept understanding of high school students. This research was a quasiexperimental research. The population in this research were all students of grade X SMA N 6 Yogyakarta. The samples taken for this research were four classes of the X graders out of 7 classes. Testing of differences in the effect of applying various learning models using the one way ANOVA test. These results of the research indicated that 1) the PBL learning model has significant effect on the problem solving and concept understanding of the ecosystem material of high school students; 2) Concept Map has significant effect on the problem solving and concept understanding of ecosystems material of high school students.
Students Profile’s Scientific Process Skills on Ecosystem Material Viewed from Favorite High School
Authors: Haryana  , Paidi  
Published: June 2019

Abstract
This study aims to determine the profile of scientific process skills of students in state high school in Bantul Regency, Indonesia in term of favorite school. The population of this study is a state high school in Bantul Regency which has become a pilot project and has implemented the curriculum of 2013 starting in 2013/2014 with total 4 school. The study sample involved 339 students of grade X. Source of students’ scientific skill profile data are from written tests, while favorite schools were obtained from interviews. Validity and reliability using Kappa coefficient and item sensitivity index. Data processing is done descriptively. The results of the study are: (a) Profile of scientific process skills competency capability of the students of state high school in Bantul Regency was very good. (b) The level of students’ preference towards the favorite school affects the ability of scientific process skill in learning process of subject Biology.
Biology E-Magazine Development in Human Respiratory System Topic for Grade VIII of Junior High School
Authors: Akbar Rachmatul , Mukminan  
Published: June 2019

Abstract
This research aims to: (1) produce multimedia learning (E-Biomagz) material for the human respiratory system for eighth grade students of Dompu 6 Middle School, Indonesia, (2) reveal product feasibility, (3) reveal the effectiveness of products developed. This development research refers to the steps of the ADDIE (Analysis, Design, Development, Implementation, and Evaluation) development model. Product testing consists of alpha tests and beta tests to determine the level of product feasibility and product effectiveness. Alpha test results was categorized very well given an average score of 3.74 by media experts and 3.53 by material experts. Beta testing results was categorized as very feasible with an average score of 3.37. Thus, the effectiveness test yielded a mean score of 37.07 for (pre-test) and 83.65 for the final analysis (post-test) so that the N-gain score obtained was 0.740 with the "High" criteria. This multimedia also proved feasible and effective in the learning process of the eighth-grade students of Dompu 6 Middle School.
Understanding Skill of Junior High School Students on Environmental Pollution Topic by Environmental-based Science Learning
Authors: Karyadi Bhakti , Ansori I. , Aswin P. 
Published: June 2019

Abstract
This study aims to describe the understanding of junior high school through the application of an environment-based learning approach to the material of environmental problems. The method refers to students’ understanding of three indicators (translation, interpretation, and extrapolation). The subject was determined by purposive sampling of 63 students from three junior high schools in the city of Bengkulu, Indonesia. The collection technique is essay test. The results of the study are: (1) the ability to translate student translation 74 (Good), interpretation of 71 (good), and extrapolation 83 (very good), (2) the percentage of three indicators of student understanding, namely 37% translation, interpretation 31%, and 32 % extrapolation, (3) the overall level of student understanding is 14%, both 68% and very good 18%. The understanding can be categorized as good in ecosystem learning. The conclusion of this study that learning with an environmental approach has a positive impact on understanding junior high school students.
Virtual Laboratory Development with Student’s Worksheet to Improve Critical Thinking on Electrochemistry for Vocational School Students
Authors: Nuryanti Sri , Masykuri Mohammad , Susilowati Endang 
Published: June 2019

Abstract
Vocational schools graduate students who are work-ready for the industries. In the era of Industrial Revolution 4.0, the critical thinking is needed. This research was aimed to develop the virtual laboratory with student’s worksheets to improve students’ critical thinking. The product, Virtual Laboratory with Student’s Worksheets (VLSW), was expected to increase students’ critical thinking after they had finished the lesson. Research and Development methods proposed by Borg and Gall were used in this research. The VLSW validation sheets were used as the instrument. The Delphi technique with eight experts was to validate virtual laboratory and student worksheets. The content validity by Aiken showed 0.94 for virtual laboratory while 0.90 for student worksheets. Therefore, virtual laboratory and student’s worksheets can then be used in electrochemistry learning. One hundred eighty tenth grade students from three vocational schools in Surakarta, Indonesia were used as samples. The average of the students’ responses to the content, presentation, language, and the chart was 92%, while student worksheets was 87%. The result of the paired sample t-test showed that VLSW significant to improve critical thinking for high and middle vocational schools, but not significant for low category vocational school. Development of learning media on other chemical concepts is needed to improve students’ critical thinking skills.
Exploring Students’ Integrated Ability and Creativity: Using 7e Learning Cycle Model in Chemistry Learning
Authors: Mustafa Linda Kurnia , Suyanta  
Published: June 2019

Abstract
This research aims to determine the influence of students’ 7E learning cycle model towards students’ integrated ability (ability to think analytical-creative in science) and students’ creativity in chemistry material. Two classes had different treatments in which experimental class used 7E learning cycle model and control class used expository. Using cluster random sampling, 64 students were chosen as samples. The technique of data collection used three instruments. They were instrument used to see students’ integrated ability consisting five questions given in the end of the class, instrument to see students’ learning creativity using questionnaire and observation. To analyze the data, this research used MANOVA. The result revealed that there was influence of 7E learning cycle model towards students’ integrated ability and creativity. In summary, 7E learning cycle model students’ integrated ability and creativity.
Developing Scientific Attitudes Instrument of Students in Chemistry
Authors: Supardi Rafsanjani , Istiyono E. , Setialaksana W. 
Published: June 2019

Abstract
This research aims to evaluate the attitude instrument which will be used to asses the scientific attitudes in chemistry classes in High School in Parepare. The research will provide informations to identificate student scientific attitudes. Scientific attitudes in this paper consist of scientific attitude indicators. They are curiosity, honesty, objectifity, perseverence, conscientious, openness, being critical, and being responsible. The instrument evaluation is done by testing it to high school student to get its validity and realibility. The instrument has 8 aspects with 32 statements. The analysis result shows that Kaiser-Mayer-Olkin (KMO) indicator is 0.922. The Measure of Sampling Adequancy (MSA) in anti image correlation indicates that all of variables is greater than 0.5 which allows the data to be analysed further. The amount of variance and variable that can be explained by the factors forms 6 factors and cumulative variance 61,884%. The 32 items in the instrument, 26 items are fulfill the 6 factors. The Realibility of all items using Cronbach Alpha coefficient is 0.948. The analysis denotes that the instrument can be used to measure the student scientific attitudes in chemistry class with 26 items and 6 factors. The results of the analysis show that the instrument can be used to measure students’ scientific attitudes on chemistry learning with the number 26 and 6 factors formed.
Dimension of Chemical Literacy and its Influence in Chemistry Learning
Authors: Fahmina Shifi Syarifa , Indriyanti N.Y. , Setyowati W.A.E. , Masykuri M. , Yamtinah S. 
Published: June 2019

Abstract
Chemical literacy is an ability that is important for students to have in the current educational era. This study aims to measure the ability of chemical literacy of high school students by using questionnaires and questions through investigation. This research was a qualitative descriptive study with samples engaging 100 students from Surakarta and Boyolali High Schools. This study investigated the achievement of the ability of chemical literacy of high school students in class XI and XII for the material of electrolyte and non-electrolyte solutions. The measured chemical literacy abilities included: a) nominal literacy (recognizing the concept of chemistry); b) functional literacy (defining key concepts); c) conceptual literacy (using chemical understanding to explain the phenomena of everyday life); and d) multidimensional literacy (using the understanding of chemistry to analyze information provided in short articles or other reading sources). The test instruments used were questionnaires, choice questions, and open-ended questions supplemented with interviews to obtain the data on the concept of students’ chemical literacy. The results of the study found that students were able to explain the concept of chemistry at the macroscopic level, but in the submicroscopic level the students’ ability was still low. This showed that students’ chemical literacy skills at the conceptual level and multi-dimensional literacy were still less. The findings of this study can help design learning strategies and teacher readiness in supporting students to develop students’ chemical literacy skills.