bluuebunny/crossref_metadata_2025 huggingface dataset:
Gravitoviscous protoplanetary disks with a dust component
Authors: Elbakyan Vardan G. , Johansen Anders , Lambrechts Michiel , Akimkin Vitaly , Vorobyov Eduard I.
Published: March 2020

Aims. We study the dynamics and growth of dust particles in circumstellar disks of different masses that are prone to gravitational instability during the critical first Myr of their evolution.

Methods. We solved the hydrodynamics equations for a self-gravitating and viscous circumstellar disk in a thin-disk limit using the FEOSAD numerical hydrodynamics code. The dust component is made up of two different components: micron-sized dust and grown dust of evolving size. For the dust component, we considered the dust coagulation, fragmentation, momentum exchange with the gas, and dust self-gravity.

Results. We found that the micron-sized dust particles grow rapidly in the circumstellar disk, reaching a few cm in size in the inner 100 au of the disk during less than 100 kyr after the disk formation, provided that fragmentation velocity is 30 ms−1. Due to the accretion of micron dust particles from the surrounding envelope, which serves as a micron dust reservoir, the approximately cm-sized dust particles continue to be present in the disk for more than 900 kyr after the disk formation and maintain a dust-to-gas ratio close to 0.01. We show that a strong correlation exists between the gas and pebble fluxes in the disk. We find that radial surface density distribution of pebbles in the disk shows power-law distribution with an index similar to that of the Minimum-mass solar nebula regardless the disk mass. We also show that the gas surface density in our models agrees well with measurements of dust in protoplanetary disks of AS 209, HD 163296, and DoAr 25 systems.

Conclusions. Pebbles are formed during the very early stages of protoplanetary disk evolution. They play a crucial role in the planet formation process. Our disc simulations reveal the early onset (<105 yr) of an inwards-drifting flux of pebble-sized particles that makes up approximately between one hundredth and one tenth of the gas mass flux, which appears consistent with mm-observations of discs. Such a pebble flux would allow for the formation of planetesimals by streaming instability and the early growth of embryos by pebble accretion. We conclude that unlike the more common studies of isolated steady-state protoplanetary disks, more sophisticated global numerical simulations of circumstellar disk formation and evolution, including the pebble formation from the micron dust particles, are needed for performing realistic planet formation studies.
Globular clusters in the Sagittarius stream
Authors: Bellazzini M. , Ibata R. , Malhan K. , Martin N. , Famaey B. , Thomas G.
Published: March 2020

We reconsider the case for the association of Galactic globular clusters to the tidal stream of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) usingGaiaDR2 data. We used RR Lyrae variables to trace the stream in 6D and we selected clusters matching the observed stream in position and velocity. In addition to the clusters residing in the main body of the galaxy (M 54, Ter 8, Ter 7, Arp 2) we confirm the membership of Pal 12 and Whiting 1 to the portion of the trailing arm populated by stars lost during recent perigalactic passages. NGC 2419, NGC 5634, and NGC 4147 are very interesting candidates, possibly associated with more ancient wraps of the Sagittarius stream. With the exception of M 54, which lies within the stellar nucleus of the galaxy, we note that all these clusters are found in the trailing arm of the stream. The selected clusters are fully consistent with the [Fe/H] versus [Mg/Fe], [Ca/Fe] patterns and the age-metallicity relation displayed by field stars in the main body of Sgr dSph.
Spirals inside the millimeter cavity of transition disk SR 21
Authors: Muro-Arena G. A. , Ginski C. , Dominik C. , Benisty M. , Pinilla P. , Bohn A. J. , Moldenhauer T. , Kley W. , Harsono D. , Henning T. , van Holstein R. G. , Janson M. , Keppler M. , Ménard F. , Pérez L. M. , Stolker T. , Tazzari M. , Villenave M. , Zurlo A. , Petit C. , Rigal F. , Möller-Nilsson O. , Llored M. , Moulin T. , Rabou P.
Published: March 2020

Context. Hydrodynamical simulations of planet-disk interactions suggest that planets may be responsible for a number of the substructures frequently observed in disks in both scattered light and dust thermal emission. Despite the ubiquity of these features, direct evidence of planets embedded in disks and of the specific interaction features like spiral arms within planetary gaps are still rare.

Aims. In this study we discuss recent observational results in the context of hydrodynamical simulations in order to infer the properties of a putative embedded planet in the cavity of a transition disk.

Methods. We imaged the transition disk SR 21 in H-band in scattered light with SPHERE/IRDIS and in thermal dust emission with ALMA band 3 (3 mm) observations at a spatial resolution of 0.1″. We combine these datasets with existing Band 9 (430 μm) and Band 7 (870 μm) ALMA continuum data.

Results. The Band 3 continuum data reveals a large cavity and a bright ring peaking at 53 au strongly suggestive of dust trapping. The ring shows a pronounced azimuthal asymmetry, with a bright region in the northwest that we interpret as a dust overdensity. A similarly asymmetric ring is revealed at the same location in polarized scattered light, in addition to a set of bright spirals inside the millimeter cavity and a fainter spiral bridging the gap to the outer ring. These features are consistent with a number of previous hydrodynamical models of planet-disk interactions, and suggest the presence of a ∼1 MJup planet at 44 au and PA = 11 deg. This makes SR21 the first disk showing spiral arms inside the millimeter cavity, and the first disk for which the location of a putative planet can be precisely inferred.

Conclusions. The main features of SR 21 in both scattered light and thermal emission are consistent with hydrodynamical predictions of planet-disk interactions. With the location of a possible planet being well constrained by observations, it is an ideal candidate for follow-up observations to search for direct evidence of a planetary companion still embedded in its disk.
Defect absorption in selenium films by photothermal deflection spectroscopy
Authors: Gotoh Tamihiro
Published: March 2020

Sub-gap absorption spectra of selenium films are investigated by photothermal deflection spectroscopy. The selenium films are prepared by vacuum evaporation of selenium pellets. Raman spectroscopy reveals that as-deposited films are amorphous, and the films annealed at 100 °C are trigonal crystal. Photothermal deflection spectroscopy is extended to infrared light of 0.31 eV with maintaining high sensitivity, and detects weak absorption at energies below the band gap. Five absorption peaks and tail absorption are observed in selenium films, and the absorption peak energies are 1.32, 1.08, 0.47, 0.41 and 0.34 eV, respectively. These absorption tail and peaks are derived from selenium, and the origin of these absorptions is explained based on the oxygen impurity and the defect structure of the selenium film.
Study of nanocrystalline silicon-germanium for the development of thin film transistors
Authors: Torres Arturo , Moreno Mario , Rosales Pedro , Dominguez Miguel , Torres Alfonso , Morales Alfredo , Itzmoyotl Adrian , de la Hidalga Javier
Published: March 2020

In this work, we study the effect of the deposition RF-power on the structural, optical and electrical properties of hydrogenated nanocrystalline silicon-germanium (nc-SiGe:H) thin films obtained by plasma enhanced chemical vapor deposition (PECVD) at substrate temperature of 200 °C. The objective is to produce films with high crystalline fraction in order to be used as active layers in thin film transistors (TFTs). Bottom-gate (BG) thin film transistors were fabricated with nc-SiGe:H active layers, deposited at different RF-power. Values of ON-OFF current ratio, subthreshold slope and threshold voltage of 105, 0.12 V/dec and 0.9 V, respectively, were obtained on TFTs with the nc-SiGe:H active layer deposited at 25 W.
Si surface passivation by using triode-type plasma-enhanced chemical vapor deposition with thermally energized film-precursors
Authors: Niikura Chisato , Shiratori Yuta , Miyajima Shinsuke
Published: March 2020

We fabricated hydrogenated amorphous Si (a-Si:H) passivation layers on the surfaces of Si wafers by using triode-type plasma-enhanced chemical vapor deposition with gas-heating, and discussed high-quality surface passivation for Si heterojunction solar cells. The sample with the a-Si:H layers corresponding to the highest proportion of SiHx(x=2,3) content in SiHx(x=1–3) content exhibited the minimum surface recombination velocity (S) after annealing. This suggests that using SiHx(x=2,3)-rich a-Si:H grown at low-temperature as a passivation layer is advantageous to inhibit an epitaxial growth at the a-Si:H/crystalline Si interface, and that a structural relaxation of the a-Si:H takes place during post-deposition annealing, drastically improving passivation quality. Also, the importance to use a low Tsub and to optimize gas-heating and the triode technique, for obtaining simultaneously higher film quality and abrupt interface, is suggested. Low S obtained for our unoptimized samples implies the potency of this deposition technique. Nevertheless, further studies are needed to elucidate the impact of gas-heating and the triode technique on Si surface passivation. Temperature-dependent effective carrier lifetime for our samples might suggest relatively large electron affinity for an a-Si:H, which might be one possible reason for high-quality surface passivation.
The strain induced type-II band re-alignment of blue phosphorus-GeX (X = C/H/Se) heterostructures
Authors: Li Honglin , Cui Yuting , Luo Haijun , Li Wanjun
Published: March 2020

Efforts to efficiently use of the next generation 2-dimension (2D) structured monolayers is getting a lot of attention for their excellent properties recently. In this work, we composite the blue phosphorus (BP) and monolayer GeX (X = C/H/Se) via van der Waals force (vdW) interaction to obtain well defined type-II band alignment heterostructures. A systematic theoretic study is conducted to explore the interlayer coupling effects and the bands re-alignment of BP-GeX (X = C/H/Se) heterostructure after the strain imposed. To devise usable and efficient materials to degrade pollutant or used as a potential photovoltaic cell material, previous researches have proved that using 2D materials as components is a feasible way to obtain high performance. Here, we prudently present a comprehensive investigation on the BP and GeX (X = C/H/Se) with different twisted angles via first-principles calculation to lay a theoretical framework on the band alignment and carriers' separation. It reveals that the intrinsic electronic properties of BP and GeX are roughly preserved in the corresponding heterostructures. Upon strain applied, band alignment can be flexibly manipulated by varying external imposed strain. The heterostructures can maintain type-II character within a certain strain range, and thus the carriers are spatially separated to different portions. This work not only provides a deep insight into the construction of the heterostructure, but presents a new possibility to search for a flexible and feasible approach to promote its catalytic performance. The corresponding results would provide meaningful guidelines for designing 2D structure based novel materials.
Du conflit d’autonomie au conflit des origines
Authors: de Sainte Marie Pascale
Published: March 2020

À partir de la conflictualité inhérente à l’autonomie psychique, l’auteur explore le conflit des origines tel que le décrit Paul Claude Racamier dans l’Antœdipe, en insistant sur le rôle organisateur du deuil originaire. Elle illustre son propos par une vignette clinique et donne des pistes pour le soin.
L’objet externe et l’objet de l’objet, prévalence dans la psychose
Authors: Reed-Duvaille Brigitte
Published: March 2020

P.-C. Racamier a donné une place prédominante à l’objet maternel externe, de façon novatrice, rendant compte de la formation des processus psychotiques.

La séduction narcissique maternelle, dépassant le temps imparti à l’Antœdipe comme par l’emprise qu’elle exerce sur l’enfant, compromet le développement psychosexuel, les capacités de croissance du Moi infantile et de séparation de l’objet, à l’origine du conflit d’autonomie.

Dans le climat incestueux, ou relation incestuelle, la scène primitive parentale, par trop incohérente, ne permet pas la construction d’identifications symbolisantes.

Une autre approche analytique peut se centrer sur le fonctionnement psychique de l’objet maternel externe.

Ce fonctionnement est marqué par la menace d’effondrement, la place de l’objet de l’objet et ses aspects transgénérationnels.

Un cas rapporté par Joyce McDougall en 1996 introduira une discussion clinique quant aux orientations analytiques possibles, face aux troubles psychotiques ou pervers, à la lumière des conceptions de P.-C. Racamier.
Poverty-alleviation communication practices of the Jerusalem Children and Community Development Organization (JeCCDO) in Negede Woito community, Bahir Dar, Ethiopia
Authors: Gessese Negesse Belay
Published: March 2020

Poverty is an important issue for third world Sub-Saharan African countries such as Ethiopia. To assist with poverty alleviation, a great number of nongovernmental organizations have moved resources into the region, but the problem has not significantly improved. This paper studies the Jerusalem Children and Community Development Organization (JeCCDO), an NGO that has engaged in poverty alleviation programs in Ethiopia for more than 35 years. The study examines communication practices used by JeCCDO as part of its poverty alleviation programs in Negede Woito community (Bahir Dar, Ethiopia). We use a qualitative research methodology to assess the organization’s communication practices, as well as the challenges it and the Negede Woito community face. Poverty is perceived as lack of resources by JeCCDO, but the community also prioritizes other forms of poverty such as psychological and cultural. Our findings reveal that JeCCDO is renowned for using a social enterprise development model and a participatory communication approach. However, in practice we find these are not used. In the models, endogenous knowledge and grassroots communication were vital to community development, but JeCCDO did not implement them during planning, implementing, and evaluating community-based programs. Community workers who coordinated the organization and the community were Negede Woito community members. Besides grassroots communication, knowing the context and living situation of the community is mandatory for development agents. JeCCDO did not contextualize development efforts, such as sheep fattening and poultry for people who did not have shelter. In conclusion, we propose that nongovernmental organizations and development workers should reconsider their communication contexts and practices while launching new poverty alleviation programs.
Growth-sequence-dependent interface magnetism of SrIrO3–La0.7Sr0.3MnO3 bilayers
Authors: Bergmann L. , Düring P. , Agrestini S. , Efimenko A. , Liao S.-C. , Hu Z. , Gargiani P. , Choi C.-J. , Baik H. , Park D.-S. , Dörr K. , Rata A. D.
Published: March 2020

Bilayers of the oxide 3d ferromagnet La0.7Sr0.3MnO3 (LSMO) and the 5d paramagnet SrIrO3 (SIO) with large spin–orbit coupling (SOC) have been investigated regarding the impact of interfacial SOC on magnetic order. For the growth sequence of LSMO on SIO, ferromagnetism is strongly altered and large out-of-plane-canted anisotropy associated with lacking magnetic saturation up to 4 T has been observed. Thin bilayer films have been grown coherently in both growth sequences on SrTiO3 (001) by pulsed laser deposition and structurally characterized by scanning transmission electron microscopy and x-ray diffraction. Measurements of magnetization and field-dependent Mn L2,3 edge x-ray magnetic circular dichroism reveal changes of the LSMO magnetic order, which are strong in LSMO on SIO and weak in LSMO underneath SIO. We attribute the impact of the growth sequence to the interfacial lattice structure, which is known to influence the interfacial magnetic coupling governed by MnO6 octahedral rotations and/or distortions.
Multiphase flow mobility impact on oil reservoir recovery: An open-source simulation
Authors: Britto A. F. , Vivas C. S. , Almeida M. P. , da Cunha Lima I. C. , da Cunha Lima A. T.
Published: March 2020

This work uses Computational Fluid Dynamics (CFD) to simulate the two-phase flow (oil and water) through a reservoir represented by a sandbox model. We investigated the influence in the flows of water having higher and lower mobilities than oil. To accomplish this, we also developed a dedicated solver, with the appropriated equations and representative models implemented in the open-source CFD OpenFOAM platform. In this solver, the black-oil model represented the oil. The results show that the Buckley–Leverett water-flood equation is a good approach for the three-dimensional flow. We observe that the water wall front is mixed to some extent with the oil and evolves obeying an exponential law. Water with mobility lower than oil is not common. However, in this case, the oil recovery is improved and the amount of injected water is reduced. The results comparing different mobilities show that a careful economic assessment should be performed before the field development. We have shown that the low water mobility can increase, as in this studied example, the water front saturation from 0.57 to 0.73, giving a substantial improvement in the oil recovery. The reservoir simulation can provide all process information needed to perform an economical assessment in an oil field exploration.
A paradigm of thermal adaptation in penguins and elephants by tuning cold activation in TRPM8
Authors: Yang Shilong , Lu Xiancui , Wang Yunfei , Xu Lizhen , Chen Xiaoying , Yang Fan , Lai Ren
Published: March 2020

To adapt to habitat temperature, vertebrates have developed sophisticated physiological and ecological mechanisms through evolution. Transient receptor potential melastatin 8 (TRPM8) serves as the primary sensor for cold. However, how cold activates TRPM8 and how this sensor is tuned for thermal adaptation remain largely unknown. Here we established a molecular framework of how cold is sensed in TRPM8 with a combination of patch-clamp recording, unnatural amino acid imaging, and structural modeling. We first observed that the maximum cold activation of TRPM8 in eight different vertebrates (i.e., African elephant and emperor penguin) with distinct side-chain hydrophobicity (SCH) in the pore domain (PD) is tuned to match their habitat temperature. We further showed that altering SCH for residues in the PD with solvent-accessibility changes leads to specific tuning of the cold response in TRPM8. We also observed that knockin mice expressing the penguin’s TRPM8 exhibited remarkable tolerance to cold. Together, our findings suggest a paradigm of thermal adaptation in vertebrates, where the evolutionary tuning of the cold activation in the TRPM8 ion channel through altering SCH and solvent accessibility in its PD largely contributes to the setting of the cold-sensitive/tolerant phenotype.
How ‘Portuguese’ are Palenquero and Chabacano really?
Authors: Jacobs Bart , Parkvall Mikael
Published: March 2020

A long-lasting debate within creole studies concerns the scarcity of Spanish-based creoles and the theoretical implications this may have. However, there is no agreement as to how many genuinely Spanish-based creoles there are in the world, and identifying the size of that group can generate controversies. Papiamentu, for instance, is canonically classified as a Spanish-based creole, even though most scholars at present seem to agree its origins are Creole Portuguese. A Portuguese lineage has on various occasions and by various authors also been claimed for Chabacano (Philippine Creole Spanish) and Palenquero (spoken in Colombia). These creoles, too, were supposedly once Portuguese-based, only to subsequently be ‘relexified’ towards Spanish. This paper argues that there is little linguistic basis for that claim. Although both creoles do indeed seem to have received some Portuguese (Creole) input, we maintain that this input was limited and substratal in nature, and thus has no bearing on the classification (whether diachronic or synchronic) of the two creoles as truly Spanish-based.
Portal dosimetry of small unflattened beams
Authors: Torres Valderrama Aldemar , Olaciregui-Ruiz Igor , González Patrick , Perik Thijs , Mijnheer Ben , Mans Anton
Published: March 2020

We developed and validated a dedicated small field back–projection portal dosimetry model for pretreatment and in vivo verification of stereotactic plans entailing small unflattened photon beams. For this purpose an aSi–EPID was commissioned as a small field dosimeter. Small field output factors for 6 MV FFF beams were measured using the PTW microDiamond detector and the Agility 160–leaf MLC from Elekta. The back-projection algorithm developed in our department was modified to better model the small field physics. The feasibility of small field portal dosimetry was validated via absolute point dose differences w.r.t. small static beams, and 5 hypofractionated stereotactic VMAT clinical plans measured with the OCTAVIUS 1000 SRS array dosimeter and computed with the treatment planning system Pinnacle v16.2. Dose reconstructions using the currently clinically applied back–projection model were also computed for comparison. We found that the latter yields underdosage of about −8% for square beams with cross section near 10 mm x 10 mm and about −6% for VMAT treatments with PTV volumes smaller than about 2cm3. With the methods described in this work such errors can be reduced to less than the ±3.0% recommendations for clinical use. Our results indicate that aSi–EPIDs can be used as accurate small field radiation dosimeters, offering advantages over point dose detectors, the correct positioning and orientation of which is challenging for routine clinical QA.
Numerical Ability Analysis: The Impact of the Two Stay-Two Stray Learning Model on the Sequence and Series Topic in Islamic Boarding School
Authors: Huda Syamsul , Yasin Muhamad , Fitri Adhenia , Syazali Muhamad , Supriadi Nanang , Umam Rofiqul , Jermsittiparsert Kittisak
Published: March 2020

Numerical ability is very important to possess by students in learning mathematics. Increased numerical ability impacts learning outcomes. The purpose of this study was to determine the impact of the Two Stay-Two Stray learning model on the numerical ability of students on the sequence and series topics. The research method used was a quasi-experimental method with a post-test-only control design research design. The assessment instrument used the problem description. Based on the analysis of the post-test score by using a t-test of two uncorrelated samples obtained tobserved= 2.955>tcritical= 2.002 (α = 0.05) with an average post-test score of 81.6 in the experimental class and 76 in the control class. A significant result of numerical ability between the control class and the experimental class was found. It can be concluded that the Two-Stay Two-Stray model produced a greater post-test mean score than the conventional model.
Utilization of Tofu Wastewater for The Growth of Red Spinach (Alternanteraamoenavoss) in Floating Raft Hydroponic Cultures
Authors: Anggraini W , Zulfa M , Prihantini N N , Batubara F , Indriyani Ririn
Published: March 2020

This study aimed to determine the effect of giving liquid tofu fertilizer to the growth and yield of red spinach plants (Alternanteraamoenavoss) with floating raft hydroponic techniques. Research on red spinach growth parameters was carried out at Horti Park Lampung. The method used in this study was Complete Random Design (CRD) consisting of 4 concentration P0 (0% AB Mix), P1 (30%), P2 (45%) and P3 (60%) and 3 replications. The study was conducted for 4 weeks. Measurements and observations are carried out 4 times, i.e. every 1 week. The parameters measured were stem height, number of leaves, leaf width, root length. Then, the data analysis was performed using One Way ANOVA on SPSS 17, and register later with the LDS test at the level of 5% significance. The results showed that tofu wastewater available at P3 maintenance (60%) was significantly different from other treatments, and at the same time discussed liquid waste which was known at the time of preparation of P1 (30%) because, it did not depend on nutrients contained in inside, so it causes less growth, compared to the implementation of P0 (0%), P2 (45%) and P3 (60%).
Mathematical Critical Thinking Ability: The Effect of Scramble Learning Model assisted by Prezi in Islamic School
Authors: Yasin Muhamad , Huda Syamsul , Komarudin  , Suherman  , Septiana Reni , Palupi Endah Kinarya
Published: March 2020

This study aims to determine the effect of scramble learning models assisted by prezi on mathematical critical thinking skills. The type of research used was quasi-experimental design. Data collection was performed by tests of mathematical critical thinking skills. Data were analysed using one-way ANOVA test and continued with multiple comparisons. Hypothesis testing used one way ANOVA with a significance level of 5%. The result of hypothesis test showed F count is 3.24 and F table is 3.10 or F count is greater than F table, then, hypothesis 0 is rejected. This study found that the average score of the class using scramble learning model assisted by prezi was higher than the class that used scramble learning model and conventional learning model. Based on these results it can be concluded that there is an influence of the scramble learning model assisted by prezi on the mathematical critical thinking ability of grade VII.
The Comparison of Concept Attainment Model and Treffinger Model on Learning Outcome of Al-Kautsar Senior High School Bandar Lampung
Authors: Anggraini W , Maskur R , Susanti A , Suryani Y , Safitri W D , Susilowati N E
Published: March 2020

The objective of this research was to discern the differences between the Concept Attainment Model and the Treffinger model on students’ learning outcomes of the cognitive and affective domains. The sample of the research consisted of XI Science 5 and XI Science 4 students collected by employing the random sampling technique. The researcher managed using a quasi-experimental design. The obtained data were analyzed using normalized-gain through Microsoft Excel 2010 to know the increase in students’ academic achievement. The data of the Pre-test and Post-test was statistically examined by administering a normality test, homogeneity test, and t-test. The average cognitive domain on concept attainment class showed that N-gain was 0.37 and 0.58on Treffinger class. The statistical examination further showed that tobserved>tcritical which meant H0 was rejected and H1 was accepted. The average effective domain was 82.87% for concept attainment class and 84.90% for the Treffinger class. Treffinger model, according to the results of N-gain and the percentage, was better at the outcome comparing to the concept attainment model. Referring to the result of the t-test, it also indicated that there was a significant comparison between the Treffinger model and the concept attainment model towards academic achievement especially the cognitive domain showed by tobserved>tcritical.
Adobe Flash Development Using Interaction Treatment Aptitude to Improve the Reasoning of Kinetic Theory of Gas and Thermodynamic Materials
Authors: Aswirna P , Yulianti P , Fahmi R , Agustin N A
Published: March 2020

This research aims to develop an adobe flash learning media using aptitude treatment interaction to improve reasoning. The research method was Research and Development (R&D) with 4D model design, to increase the reasoning ability, Quasi-Experimental research with a 2x2x2 Factorial research design was used. The population of this research was the entire class XI MIPA SMAN 1 Pantai Cermin in the academic year of 2018/2019. The sampling technique used was cluster random sampling. The data analysis technique used to test the hypothesis was ANCOVA. The results showed that (1) physics learning media is valid, very practical, and effective, (2) the average physics learning outcomes integrated reasoning ability on the kinetic theory of gas at XI MIPA 1 is 92 (independent) and 87.56 (re-teaching), while XI MIPA 2 is 88.83 (independent) and 90.56 (re-teaching). Learning outcomes in class XI MIPA 1 thermodynamic material are 89 (independent) and 88.31 (reteaching) while XI MIPA 2 is 85.92 (independent) and 86.78 (re-teaching). It can be concluded that the Aptitude Treatment Interaction model assisted by Adobe Flash media affects the increase in integrated learning outcomes of students’ reasoning abilities which are categorized as faster students who are taught in self-learning and reteaching.
Utilization of Basil Leaf Extract as Anti-Mosquito Repellent: A Case Study of Total Mosquito Mortality (Aedes aegypti 3rd Instar)
Authors: Husna Ismalia , Setyaningrum Endah , Handayani Tundjung Tripeni , Kurnia Yogi , Palupi Endah Kinarya , Umam Rofiqul , Andriana Bibin Bintang
Published: March 2020

This study aims to determine the most effective concentration of extract that kills the larvae in the third instar Aedes aegypti, knowing the value of LC50 and LC90 anthen knowing the value of LT50 and LT90 of forest basil leaf extract (Ocimum sanctum). Research is using a completely randomized design with factorial, and the first factor is forest basil leaf extract with 5 level concentrations, there are 0.3%, 0.6%, 0.9%, 1.2%, 1.5%, and 0% as control, whereas the second factor is observation period that began after the death of the larvae. Observations were made up to 4320 minutes. The results showed the influence of forest basil leaf extract against third instar larvae mortality of Aedes aegypti, and the most effective concentration of basil leaf extract to kill the larvae was 1.5%. LC50 values of this study was 0.97%, and for the LC90value was 1.42%. Value of LT50and LT90 of this study is 5,71 hours or 342,31 and 17,02 hours or 1021.22 minutes. The conclusion of this study is basil leaf extract forest affect mortality third instar larvae of Aedes aegypti, and the most effective concentration of extract was 1.5%.
Development of Interactive Mathematics E-Module Using Visual Studio
Authors: Farida  , Pratiwi D D , Andriani S , Pramesti S I D , Rini J , WKuswanto C , Sutrisno E
Published: March 2020

This development research aims to develop an interactive mathematics e-module using Visual Studio in the curvature material for the ninth grade students of junior high school. The study was conducted to find out the attractiveness, convenience, usefulness, and effectiveness of the e-module at MTs Negeri 2 Bandar Lampung. This study aims to produce teaching materials in the form of an e-module that is suitable for the learning objectives. The method refers to the 4D research and development (R & D) design (Define, Design, Develop, and Disseminate). The final product produced obtained an average score of 3.46 in the field trial with very interesting criteria. The effectiveness test results show that the e-module is effectively used as learning media because they get a value of n Gain of 0.38 with moderate criteria and 93% of students have completed the value of mathematics Minimum Completion Criteria (KKM) that has been set, 73.
The Manufacture of The KETA Chemistry Game for Voltaic Cells Learning Materials
Authors: Aisyah R , Fatimah N S , Farida I
Published: March 2020

Education games are designed to stimulate students’ thinking capability and improve their concentration and problem-solving skill. The KETA Chemistry game, based on chemistry literacy, employs a virtual laboratory and hidden objects to help students learn voltaic cell materials. The purpose of this research was to develop a mobile education game as alternative media for learning voltaic cells through a simulation of real-life experiments. Research and Development method was employed. Although theoretically, the method consists of five stages, only two of them were applied in this research (define and design). The final product of the research is The KETA Chemistry, an education game, which combines 2D and 3D elements in its gameplay and the next stage of development, the media will be validated and said to be validated and said to be feasible if it meets the media’s worthiness.
The Effectiveness of Creative-Inquiry-Based Student Worksheet in Improving Physics Self-Efficacy and Problem Solving of Senior High School Students
Authors: Wulantri  , Distrik I W , Suyatna A , Rosidin U
Published: March 2020

The objective of this research is to describe the use of creative-inquiry-based student worksheets in improving physics self-efficacy and problem solving of senior high school students. This was quasi-experiment research with pretest and posttest control group design. Samples were taken using the purposive sampling technique. They were the twelfth-grade students of Public Senior High School 7 in Bandar Lampung and Public Senior High School 1 in North Sungkai. Samples were divided into two groups; the experimental group taught by using a creative-inquiry-based student worksheet and control group taught by using student worksheet sold freely in the market. Instruments used were self-efficacy sheets and problems to test physics problem-solving ability. The data were analyzed by using descriptive analysis with percentage technique, N-gain, and independent t-test. The result showed that a creative-inquiry-based student worksheet is effective to be used to improve self-efficacy and ability of physics problem-solving. Good self-efficacy will have implications for the level of physics problem-solving ability in solving physics problems.
Fermat’s Principle and Hamilton’s Principle: Does a least action take a least time for happening?
Authors: Anderson M , Hadi M , Deta U A
Published: March 2020

We explore deeper and analyse in more detail Fermat’s and Hamilton’s principles. We try to address some questions: Is it possible to have S negative? Is Hamilton’s principle always valid for entire path of the system? Is there a relation between Fermat’s principle and Hamilton’s principle? We assume analogy with Hamilton’s principle, is Fermat’s principle always valid for entire path of the system? Does a least action take a least time for happening?.
The Effect of Problem Posing Type Post-Solution Posing Learning Model on Self-regulation Skills and Science Process Skill of the Tenth-grade Students of Islamic Senior High School Kebumen, Tanggamus
Authors: Hijriyah U. , Pratiwi E. , Susanti A. , Anggraini W. , Febriani A. P.
Published: March 2020

This study aims to determine the influence of the Problem Posing Type Post-Solution Posing learning model on the self-regulation and science process skills of the tenth-grade students. This research was conducted at Islamic Senior High School Kebumen, Tanggamus. The research method used was a quasi-experiment design. The population of this study was all of the tenth-grade science students of Islamic Senior High School Kebumen. The samples in this study were the students of X MIPA 1 as the experimental class which consisted of 36 students and the students of X MIPA 2 as the control class which consisted of 36 students. The instruments used in this study were the non-tests and test instruments; non-tests in the form of questionnaires to measure self-regulation and test instrument in the form of essay questions to measure science process skills. The Multivariate of variance (MANOVA) hypothesis test was used using the SPSS 0.17 program. The established results are sig 0,000 r meaning sig < 0.05 so that H0 is rejected and H1 accepted. It can be concluded that there is an influence of the Problem Posing Type Post-Solution Posing learning model on self-regulation skills and science process skills.
Developing Electronic Student Worksheet Using 3D Professional Pageflip Based on Scientific Literacy on Sound Wave Material
Authors: Koderi K , Latifah S , Fakhri J , Fauzan A , Sari YP
Published: March 2020

This study aims to determine the feasibility of electronic student worksheet learning media with 3D Pageflip Professional based on scientific literacy through the results of expert validation and study the students’ responses toward the developed media. This research is a development research by employing Research and Development method (R & D), specifically the ADDIE model. The subject of the research consisted of experts (content material experts and media experts) and the students of the eleventh grade of senior high school. The results of the expert validation reveal that the developed media belongs to the feasible category with a percentage of 86% from the content material experts and 94% from the media experts. The teachers and students respond positively to the attractiveness of the developed media as a medium of learning with a percentage of 89% from the teachers, 86% from the small-group trial, and 85% from the field trial. Thus, the developed media is categorized as attractive. The electronic student worksheet learning media with 3D Pageflip Professional based on scientific literacy on sound waves is highly feasible and obtains positive response to serve as a medium of learning.
Blended Learning Model: Can It Reduce Students’ Misconception In Physics?
Authors: Kesuma Guntur Cahaya , Diani Rahma , Hasanah Nur , Fujiani Dwi
Published: March 2020

This study was designed to determine the effect of blended learning learning model on students’ misconceptions in temperature and heat. The sample of this study comprised only 35 students from class X in one of the high schools in Pesawaran District, Lampung. The instruments used to measure students’ misconception was four-tier diagnostic test with the Certainty of Response Index (CRI). Quantitative descriptive with pre-experimental design was used as the methods. The results showed that before learning with blended learning model, students’ misconception reached 54.90%, and after tested with the blended learning model, the students’ misconception presentation dropped to 22.04%.Thus, decreasing misconception by implementing blended learning model reached 33%. From the results of the t-test, it was also known that Tcount>Ttable (9,099> 2,035) which means H0 is rejected and H1 is accepted. Based on this result, it can be concluded that blended learning can reduce students’ misconception in temperature and heat.
Development of Higher-order Thinking Test Instrument on Fluid Material for Senior High School Students
Authors: Akhsan H , Wiyono K , Ariska M , Melvany NE
Published: March 2020

This study aims to produce valid and reliable HOTS physics questions based on Borg and Gall development model. The data collection instruments used consisted of questions grids, question sheets, and validation sheets. The data analysis techniques used were item analysis consisting of validity, difficulty level, and discrimination index analysis, and reliability test. The results of this development are 15 valid questions out of 25 items developed. Of the 25 items, 3 items were declared difficult, 20 items had a moderate level of difficulty, and 2 other items were relatively easy. Also, these questions were stated to be reliable through the Cronbach Alpha value of 0.78. The results of this study indicate (1) the instrument is declared valid by the experts with the value of 4.5 and (2) this instrument is declared reliable through the reliability tests on stage one and two respectively with the obtained value of 0.74 and 0.76 which is included in the high-reliability level. Thus, based on the results of the research, the HOTS instrument on fluid material is classified as valid and reliable.
Construction of High School Chemistry Module, Based on Problem-based Learning (PBL) on Salt Hydrolysis Material for Gifted Students
Authors: Kusumah R G T , Walid A , Sugiharta I , Putra E P , Wicaksono I , Erfan M
Published: March 2020

This research aims to develop a Problem-based Learning Module for Hydrolysis Material considering the characteristics, feasibility, and effectiveness to accommodate gifted students. The tests were conducted to material experts, media experts, and students. The model used as the basis for the development of Problem-Based Learning (PBL) chemistry module is the 4-D model (Define, Design, Development and Disseminate). Data analysis techniques are observation and questionnaire. Based on the test, it shows that the Problem-based Learning Module received a good category and is worth it to use. Cognitive learning outcomes of students in the experimental class after using the Problem-Based Learning Module is better than the control class that uses conventional learning. It can be seen from the comparison of the average score of improvement in the learning outcomes of experimental class students who use Problem-Based Learning modules. So, it can be concluded that the learning outcomes using the Problem-Based Learning chemistry learning module are better than conventional learning.
Polyvinylpyrollidone/Cellulose Acetate (PVA/CA) Fiber Size Prediction Using Scaling Law Model
Authors: Jauhari J , Suharli AJ , Saputra R , Nawawi Z , Sriyanti I
Published: March 2020

The purpose of this research was to compare the diameter of the fiber produced using the electrospining method and scaling law model. The electrospinning process is a simple technique in producing nanofibers from the incorporation of various polymers. The polymer material used is Poly (vinylpyrrolidone) (PVP) with Cellulose acetate (CA) solvent. Cellulose acetate (CA) solvents using different concentrations were 6% (PC 1), 10% (PC 2) and 17% (PC 3). The process parameters used electrospinning voltage is 10 kV, the needle tip to collector distance is 13 cm and flowrate used is 3.2 µL/hour. The product of nanofibers was morphologically characterized using a digital microscope and the fiber diameter size was predicted using a scaling law model. The scaling law model predicts electrical conductivity in PC 1, PC 2, PC 3 samples are 0.004298 S/m, 0.001289 S/m, and 0.000374 S/m respectively. The results of the logarithmic comparison of Q/K to the diameter of the nanofiber produce a linear graph pattern with a decrease in the value of K resulting in the diameter of the nanofiber-based on the results of experiments that have been carried out.
Identification of Creative Thinking Ability of Malay Ethnic Students in Archimedes Law with Rasch Analysis Model (RAM): A Case Study
Authors: Andriani N , Suhendi E , Samsudin A , Ramalis T R
Published: March 2020

This study aims to identify the creative thinking skills of vocational school students with Malay ethnicity in solving problems regarding Archimedes law. Creative thinking skill is skill that students must have in the 21st century. Therefore, this skill must be trained through the learning process. This research was conducted on 21 students of class X DPIB with 12 men, 9 women and 15 of them are ethnic Malay, the rest are settled migrants. This research is a case study research. The data obtained were analysed with Rasch Analysis Model (RAM). From the analysis results it was found that the ability of Malay students’ creative thinking was still low. The reliability person is weak and the reliability item is good. The tendency of respondent’s ability to work on problems is smaller than the level of difficulty of the questions. There are differences in the level of creative thinking ability of Malay ethnic and non-Malay ethnic students.
E-learning with STEM-Based Schoology on Static Fluid Material
Authors: Syafei Imam , Saregar Antomi , Hairul  , Thahir Andi , Sari Putri Mardiana , Anugrah Adyt
Published: March 2020

The purpose of this research and development is to determine the feasibility and attractiveness of e-learning media with STEM-based Schoology on static fluid material. This study uses the research and development method (Research and Development ) proposed by Borg and Gall. The product’s feasibility was investigated by 6 validators from three aspects of validation. The attractiveness of the product was tested on teachers and high school students aged 15-16. The results show that the e-learning media with STEM-based Schoology on static fluid material is highly feasible with a percentage of 93% based on the material expert’s validation, 86% according to media experts validation, and 83% according to IT experts validation. The results of trials on teachers and students show percentages of 90% and 92.5% which belongs to the very attractive category. It can be concluded that the e-learning media with STEM-based Schoology on static fluid material is highly feasible and appropriate to be used as a learning media.
Critical-Thinking Instrument Based on Google Form: Development on Work and Energy Materials
Authors: Yana Evi , Irwandani  , Sari Nopita , Amirrudin  , Amrullah Afif , Jatmiko Agus
Published: March 2020

Curriculum 2013 requires students to have critical-thinking skills, especially in physics. Preliminary research conducted at several schools found the lack of questioning instruments that require students to have critical-thinking skills and teachers in conducting evaluations still using conventional paper media (paper tests). The purpose of this research is to find out how the characteristics of the instrument about the ability to think critically using Google Form and to find out how the validity and reliability of the items as well as the responses of teachers and students to the instrument about the critical-thinking skills using Google Form. The instrument developed was a multiple-choice grid test that was oriented towards students’ critical-thinking skills. The assessment instruments that have been developed in this study are declared valid and reliable as well as the response of teachers and students very well to the question instruments developed.
Development of Google Form Based on Scientific Literacy Principles for Junior High School Students in Heat Material
Authors: MM Renny Yunus , Irwandani  , Asniati Melisa , Anwar Chairul , Subandi
Published: March 2020

The research aims to develop and find out the attractiveness and feasibility of Google Form based on scientific literacy questions for junior high school students on heat material. This study uses the Borg and Gall model. The steps used in this research are potential and problems, inFormation gathering, product design, design validation, design revision, product testing, and product revision. The results showed that the percentage of media, material, and language experts were 94.7%, 89%, and 80%, the teacher’s response was 90.41% and students’ interest with a percentage of 87%. The trial instrument of 25 items was declared valid, reliable, and functioning well. So, it can be concluded that the instrument of Google Form based on scientific literacy questions for junior high school students on heat material meets the requirements of very decent quality and is very interesting to be used by students.
Understanding Mathematical Concept: The Effect Of Savi Learning Model With Probing-Prompting Techniques Viewed From Self-Concept
Authors: Widyastuti Rany , Suherman  , Anggoro Bambang Sri , Negara Hasan Sastra , Yuliani Mientarsih Dwi , Utami Taza Nur
Published: March 2020

This research aims to discover the effect of SAVI learning models with the Probing-prompting technique in terms of self-concepts on students’ mathematical conceptual understanding. The method used in this research was the quasi-experimental design. The experimental design used in this study was the post-test only design with a 3x3 factorial research design. The population in this study were 153 students. The sampling technique used was random. The normality test, homogeneity test, two way ANOVA test and Scheffe’ method were used as data analysis techniques. The results showed that there is an influence of the SAVI learning model with probing-prompting techniques in terms of students’ self-concepts on the ability to understand mathematical concepts compared to conventional learning models applied by teachers at school.