HUBUNGAN ANTARA SELF-REGULATED LEARNING DENGAN DISIPLIN BELAJAR SISWA

Penelitian ini dilatarbelakangi oleh rendahnya kedisiplinan siswa yang belum dapat menerapkan disiplin belajar yang baik di sekolah. Self-regulated learning merupakan strategi yang dapat membantu siswa untuk mampu berdisiplin dengan mengatur dan mengarahkan dirinya. Penelitian ini bertujuan untuk mengetahui hubungan antara self-regulated learning dengan disiplin belajar siswa kelas XI SMK Negeri 12 Bandung. Pendekatan kuantitatif dan metode deskriptif korelasional digunakan dalam penelitian ini. Populasi berjumlah 388 siswa, sedangkan sampel sebanyak 196 siswa yang diambil dengan menggunakan teknik simple random sampling. Data yang dikumpulkan diperoleh dari hasil penyebaran instrumen angket yang terdiri dari dua variabel yaitu self-regulated learning dan disiplin belajar siswa. Hasil penelitian menunjukkan bahwa (1) self-regulated learning siswa berada pada kategori sedang dengan presentase sebesar 58,4% (2) disiplin belajar siswa berada pada kategori sedang dengan presentase sebesar 51,3% (3) hasil korelasi product moment diperoleh rxy= 0,276 ini menunjukkan korelasi positif yang signifikan artinya terdapat hubungan yang berarti antara self-regulated learning dengan disiplin belajar siswa di SMK Negeri 12 Bandung. Hasil uji signifikansi didapatkan koefisien korelasi sebesar 3,999 > 1,65 maka hipotesis H0 ditolak dan H1 diterima dengan koefisien determinasi sebesar 7,61%. Adapun rekomendasi sebagai tindak lanjut penelitian ditujukan kepada guru bimbingan dan konseling dan peneliti selanjutnya. ;---This research is grounded by the lack of students’ discipline who cannot implement a good learning discipline at school. Self-regulated learning is a strategy which can help students to be able to discipline by managing and directing themselves. This research aims to identify the correlation between self-regulated learning and learning discipline of eleven grade students in SMK Negeri 12 Bandung. Both quantitative approach and descriptive-correlational method were used in this research. The number of the population were 388 students, while the number of the sample by using simple random sampling were 196 students. The collected-data of the result of administering questionnaire consisting of two variables which were self-regulated learning and the students’ learning discipline. The findings showed that (1) self-regulated learning students was mostly the middle category with the percentage of 58.4% (2) the students’ learning discipline was mostly the middle category with the percentage of 51.3% (3) the calculation result by using product moment correlation formula with rxy= 0.276 showed positive correlation signifying which meant there was significant correlation between self-regulated learning and student’s learning discipline in SMK Negeri 12 Bandung. The significance test revealed that correlation coefficient is 3,999 > 1,65 in this regard, H0 hypothesis was rejected while H1 was accepted with determination coefficient of 7,61%. In addition, the recommendation of this research as a follow-up of the research is addressed to a guidance and counseling teacher and the next researcher

Characterization of Liquid Impinging Jet Injector Sprays for Bi-Propellant Space Propulsion: Comparison of PDI and High-Magnification Shadowgraphy

[EN] Impinging jet sprays are investigated in the reference case of like-doublet injector, for application to bi-propellant combustion. Green propellants are considered, namely ethanol as a fuel and hydrogen peroxide as an oxidizer, that is well represented by water. This study reports original comparisons between standard spray characterization (PDI) and high-magnification shadowgraphy of the spray (2.5 x 3.2 mm, 2.5 µm per pixel) based on short laser backlight illumination (5 ns). Shadowgraphy images describe accurately the inner spray structure and provide the size and velocity of droplets. This diagnostic is used to analyse the influence of jet momentum (driven by injection pressure) on impinging jet atomization, as well as the evolution of spray topology, drop size distribution and average diameter along the spray centreline. The application of shadowgraphy to the dense region of water and ethanol sprays shows the different atomization behaviour of these two fluids with respect to their surface tension. Elliptical droplets are characterized inside the spray, which confirms the interest of a direct visualization of droplets in such dense sprays.The authors wish to acknowledge the support of CNES (French Space Agency).Boust, B.; Michalski, Q.; Claverie, A.; Indiana, C.; Bellenoue, M. (2017). Characterization of Liquid Impinging Jet Injector Sprays for Bi-Propellant Space Propulsion: Comparison of PDI and High-Magnification Shadowgraphy. En Ilass Europe. 28th european conference on Liquid Atomization and Spray Systems. Editorial Universitat Politècnica de València. 488-495. https://doi.org/10.4995/ILASS2017.2017.5001OCS48849

Growth Route Toward III-V Multispectral Solar Cells on Silicon

To date, high efficiency multijunction solar cells have been developed on Ge or GaAs substrates for space applications, and terrestrial applications are hampered by high fabrication costs. In order to reduce this cost, we propose a breakthrough technique of III-V compound heteroepitaxy on Si substrates without generation of defects critical to PV applications. With this technique we expect to achieve perfect integration of heterogeneous Ga1-xInxAs micro-crystals on Si substrates. In this paper, we show that this is the case for x=0. GaAs crystals were grown by Epitaxial Lateral Overgrowth on Si (100) wafers covered with a thin SiO2 nanostructured layer. The cristallographic structure of these crystals is analysed by MEB and TEM imaging. Micro-Raman and Micro-Photomuminescence spectra of GaAs crystals grown with different conditions are compared with those of a reference GaAs wafer in order to have more insight on eventual local strains and their cristallinity. This work aims at developping building blocks to further develop a GaAs/Si tandem demonstrator with a potential conversion efficiency of 29.6% under AM1.5G spectrum without concentration, as inferred from our realistic modeling. This paper shows that Epitaxial Lateral Overgrowth has a very interesting potential to develop multijunction solar cells on silicon approaching the today 30.3% world record of a GaInP/GaAs tandem cell under the same illumination conditions, but on a costlier substrate than silicon.Comment: Preprint of the 28th EUPVSEC proceedings, September 2013, Paris, France. (5 pages

towards disruptions in earth observation new earth observation systems and markets evolution possible scenarios and impacts

Abstract This paper reviews the trends in Earth observation (EO) and the possible impacts on markets of the new initiatives, launched either by existing providers of EO data or by new players, privately funded. After a presentation of the existing models, the paper discusses the new approaches, addressing both commercial and institutional markets. New concepts for the very high resolution markets, in Europe and in the US, are the main focus of this analysis. Two complementary perspectives are summarised: on the one hand, the type of system and its operational performance and, on the other, the related business models, concepts of operation and ownership schemes. Until now, Earth observation systems for the most critical institutional needs are mainly dedicated assets owned and operated by governments or public organisations, often at national level. Even in the case of dual use missions, the governmental and commercial operations are in general fully segregated for the very high resolution satellites. Recent evolutions could affect this paradigm. Firstly, the increased performance of commercial satellites has a high degree of convergence with defence needs: 25–30 cm resolution is now the benchmark or at least a very short term target for commercial missions. The second evolution is the development of hybrid procurement schemes, combining proprietary missions and data buy framework contracts, partly triggered by the budgetary constraints of public customers, some failures in the execution of large spy satellites contracts and by the willingness to foster the competitiveness of industry on the export market. New space is another trend, which is more disruptive. This trend begun in the Silicon Valley and spread worldwide, arousing our expectations, sometimes excessively. This new model involves not only start-ups but also big web actors with substantial investment capacity. Both aim to transforming space into a commodity, taking benefit from the convergence between Information technology and EO. Beside the massive constellations for broadband Internet access, some initiatives have been launched for Earth observation markets, targeting high resolution and high revisit. Last but not least, more and more countries, the newcomers, invest in their own EO capacity, confirming the soft power dimension of space but also opening new opportunities for international or regional cooperation. As many unpredictable events may occur, even in a short time frame, the last part of the paper has a prospective dimension. Based on market trends and industrial stakes, it discusses the realism and likelihood of possible scenarios and identifies their impacts on the EO landscape and the main stakeholders involved, in particular in Europe: – The governmental and institutional actors, using Earth observation data for their operational missions, with an evolving balance between sovereign assets and external services. – The commercial operators of very high resolution satellites, with the new market opportunities and the possible emergence of worldwide champions. – The satellite manufacturers and their competitiveness. – The role of nations and space agencies, including the non-dependence or national sovereignty and international cooperation dimensions. Based on the comparison of three "radical" scenarios, the conclusion shows that there are opportunities for service providers and satellite manufacturers. Even without clear answer to the future industrial, technical and political structure of EO systems, relevant indicators to be monitored during the next three-five years are identified. The last section focuses on Europe and the role of institutions in order to support European champions and small and medium companies in the new worldwide competition

Interactions between Soot and CH* in a Laminar Boundary Layer Type Diffusion Flame in Microgravity

A three-dimensional laminar non-buoyant diffusion flame was studied with the objective of improving the understanding of the soot production. The flame originated from a porous ethylene burner discharging into a laminar boundary layer. Soot volume fractions were measured using Laser-Induced Incandescence (LII) and the spontaneous emission from CH* was determined using chemiluminescence. The main parameter varied was the oxidizer flow. CH* measurements allowed to identify the reaction zone, while LII measurements permitted the tracking of soot. It was observed that soot volume fractions are inversely proportional to the global residence time. This is in contradiction to previous studies on axi-symmetric non-buoyant diffusion flames. The combined measurements allowed to establish that the apparently contradictory behaviour can be explained by an analysis of the influence of the flow field on the ratio of soot production to oxidation

Acute aquatic toxicity to zebrafish and bioaccumulation in marine mussels of antimony tin oxide nanoparticles

Antimony tin oxide (Sb2O5/SnO2) is effective in the absorption of infrared radiation for applications, such as skylights. As a nanoparticle (NP), it can be incorporated into films or sheets providing infrared radiation attenuation while allowing for a transparent final product. The acute toxicity exerted by commercial Sb2O5/SnO2 (ATO) NPs was studied in adults and embryos of zebrafish (Danio rerio). Our results suggest that these NPs do not induce an acute toxicity in zebrafish, either adults or embryos. However, some sub-lethal parameters were altered: heart rate and spontaneous movements. Finally, the possible bioaccumulation of these NPs in the aquacultured marine mussel Mytilus sp. was studied. A quantitative analysis was performed using single particle inductively coupled plasma mass spectrometry (sp-ICP-MS). The results indicated that, despite being scarce (2.31 × 106 ± 9.05 × 105 NPs/g), there is some accumulation of the ATO NPs in the mussel. In conclusion, commercial ATO NPs seem to be quite innocuous to aquatic organisms; however, the fact that some of the developmental parameters in zebrafish embryos are altered should be considered for further investigation. More in-depth analysis of these NPs transformations in the digestive tract of humans is needed to assess whether their accumulation in mussels presents an actual risk to humans.Fundação para a Ciência e Tecnologia | Ref. 2020.04021.CEECIN

The role of dynamical polarization of the ligand to metal charge transfer excitations in {\em ab initio} determination of effective exchange parameters

The role of the bridging ligand on the effective Heisenberg coupling parameters is analyzed in detail. This analysis strongly suggests that the ligand-to-metal charge transfer excitations are responsible for a large part of the final value of the magnetic coupling constant. This permits to suggest a new variant of the Difference Dedicated Configuration Interaction (DDCI) method, presently one of the most accurate and reliable for the evaluation of magnetic effective interactions. This new method treats the bridging ligand orbitals mediating the interaction at the same level than the magnetic orbitals and preserves the high quality of the DDCI results while being much less computationally demanding. The numerical accuracy of the new approach is illustrated on various systems with one or two magnetic electrons per magnetic center. The fact that accurate results can be obtained using a rather reduced configuration interaction space opens the possibility to study more complex systems with many magnetic centers and/or many electrons per center.Comment: 7 pages, 4 figure

Practical Works on Nanotechnology: Middle School to Undergraduate Students

Since its emergence a few decades ago, nanotechnology has been shown to be a perfect example of a crossroad between different fundamentals sciences. In the last 10 years, the continuous progress of classical top-down lithography and the use of alternative bottom-up elaboration methods has allowed new and smaller components to be created. Their combination has led to very complex and innovative architectures. At the same time, flexible, low-cost, and low-ecological-footprint devices have emerged. Thus, the diversity and multidisciplinary features present challenges in addressing these issues in educational programs