Abstract In this paper, the process of the design a Teaching Learning Sequence (TLS) on Newton’s Law for high school is presented. The design of the TLS follows Design Based Research (DBR) ...methodology First, the grasp of the design is going to be presented to later, present the data obtained after the application of instruments designed to evaluate the TLS regarding the students achievement and the quality of the TLS. How we involved in-service teachers to participate in the design and redesign process and the implementation of the TLS is also explained.
Changing where, when, and how objects are studied is central to lab-based science (Knorr Cetina, 1999). Science involves changing the scale of objects—particularly scales of size, time, and ...intensity—from what is experienced in the world. Similar to investigations conducted in science laboratories, classroom investigations involve re-representing and re-scaling entities, manipulating them, and observing effects in new locations and timescales. However, this aspect of investigation is under-studied and under-utilized as a resource for learning. We argue that, from elementary school, children can experience quantification, or identifying, developing, and working with variables, as consequential and can take up differences in representation and scale in empirical investigations as opportunities for sense-making and conceptual progress. We describe two instantiations of an investigation into heating and cooling, showing that 7- and 8-year-old students oriented to gaps and ambiguities related to temperature and that the redesign supported children and teachers to take up temperature for productive sense-making and conceptual progress. We examine opportunities for quantification across the heating and cooling investigation and a second investigation into landforms. This work has implications for supporting quantification in science activity in the early grades and using empirical investigations as opportunities for sense-making.
Designing between tradition and innovation Soares, Liliana; Aparo, Ermanno; Rivas, Manuel ...
Materials today : proceedings,
2023, 2023-00-00, Letnik:
85
Journal Article
Recenzirano
This paper highlights that to designing between tradition and innovation it is important to comprise identity, value, and product life cycle. The authors underline a building of a slaughterhouse from ...the North of Portugal, located between the Atlantic Ocean and the historical center of a city, that has been inactive since 1990 and awaits adaptation. This means that administrative inefficiency presents itself as a new problem that designers, builders and entrepreneurs must face, requiring to constantly diagnose the situation.
Methodologically, this research is supported by co-design and productive reasoning, connecting conventional methods with new techniques. The paper presents some cases of restoration of buildings, or even entire neighborhoods where the installation of creative activities positive for the economy of an entire urban community.
This paper constitutes a creative approach relating design and business world, bridging the gap between tradition and innovation. This project can serve as a stimulus to attract companies, creating new Stakeholders that stimulate development and innovation. It is hoped to found judgments, incentives and, above all, conditions so that creative young people can continue to live on their own land or turning this place into a pole of attraction of creativity, competitive and with a sense of future.
An antilock braking system (ABS) is one of the most effective active safety control systems for ground vehicles, since it can keep the rotational wheel from locking and, consequently, guarantee the ...braking safety and handling stability. There have been a variety of ABS control schemes proposed by many researchers. However, most of the results employ sundry tire-road friction models, the alleged <inline-formula><tex-math notation="LaTeX">\mu\, \text{--}\,\lambda</tex-math></inline-formula> curves (<inline-formula><tex-math notation="LaTeX">\mu</tex-math></inline-formula> is the tire-road friction coefficient, while <inline-formula><tex-math notation="LaTeX">\lambda</tex-math></inline-formula> is the tire slip ratio, which is mathematically defined as <inline-formula><tex-math notation="LaTeX">\lambda =({v-\omega r})/{v}</tex-math></inline-formula>), making the ABS controller extremely complicated for the highly nonlinear characteristics of the <inline-formula><tex-math notation="LaTeX">\mu\, \text{--}\,\lambda</tex-math></inline-formula> relationship. Furthermore, the a priori knowledge of road conditions for these ABS controllers restricts their practicability. To circumvent these problems, a two-time-scale ABS control scheme is proposed in this paper, without considering the intricate <inline-formula><tex-math notation="LaTeX">\mu\, \text{--}\,\lambda</tex-math></inline-formula> relationship, making the a priori knowledge of the road condition no longer a prerequisite; thus, the designed ABS controller is rather simple. In addition, a modified fast-time-scale estimator is involved to estimate the road condition, which is significant in vehicle active dynamics control. The effectiveness of the proposed ABS controller is verified via numerical simulations and CarSim-MATLAB cosimulations.
This paper conducts a systematic study to address the problems of high flow loss and low energy efficiency of centrifugal pumps caused by the development of secondary flow within the impeller. Based ...on the forces balance in the direction perpendicular to the streamline, theoretical calculations are drawn to redesign blade thickness for a 5-blade centrifugal impeller to suppress the secondary flow. The correlations between the development of internal secondary flow within the impeller and energy efficiency of centrifugal pump under full flow rate conditions are illustrated by numerical simulations validated by experimental tests. Secondary flow coefficient and entropy production rate (EPR) are introduced and extracted to quantitative analysis the secondary flow level and energy loss inside the impeller. Results indicate that the blade redesign methods proposed here can efficiently inhibit the development of secondary flow and improve the energy efficiency. Moreover, the secondary flow coefficient introduced in this paper can quantitatively reflect the intensity of secondary flow under various flow rates of different impellers. Combining with the entropy production analysis of impeller, the consistent change trend of total secondary flow coefficient and entropy production reveals that the improvement of pump energy efficiency benefits from the reduction of turbulence EPR which results from the suppression of internal secondary flow.
•Theoretical calculations of blade thickness for low specific speed centrifugal pump.•Blade redesign based on secondary flow suppression to improve energy efficiency.•Quantitative analysis of secondary flow and energy losses in the impeller.•Improvement of energy efficiency attributes to the reduction of turbulence EPR.
The EOS disk + CERN Tape Archive (EOSCTA) service is CERN’s primary physics data long-term storage and archival solution for LHC Run 3. It entered production at CERN during summer 2020 and has since ...been serving all the LHC and non-LHC workflows involving archival to-and retrieval from tape. The CTA system is a complete redesign of the previous tape software, tape cache and tape workflows, which will need to scale to the data rate requirements of the present LHC activity period, as well as the one after. At the time of writing it has already set new records for monthly tape archival volume at CERN and reached write efficiencies equalling those demonstrated during earlier data challenges.
Architecting the OpenSearch service at CERN Papadopoulos, Sokratis; Saiz, Pablo; Schwickerath, Ulrich ...
EPJ Web of Conferences,
2024, Letnik:
295
Journal Article, Conference Proceeding
Recenzirano
Odprti dostop
The centralised Elasticsearch service has been running at CERN since 2016, providing the search and analytics engine for numerous CERN users. The service has been based on the open-source version of ...Elasticsearch, surrounded by a set of external open-source plugins offering security, multitenancy, extra visualization types, and more. In October 2020, CERN embarked on an evaluation of OpenDistro for Elasticsearch, an alternative solution that used a different set of modules while retaining the core of open-source Elasticsearch. Notably, OpenDistro offered the advantage of bundling all components together, simplifying the deployment of new versions. This evaluation gained increased significance following a license change imposed by Elastic, the original creators of Elasticsearch. Consequently, the OpenDistro project was rebranded, now based on a forked version of Elasticsearch, called OpenSearch. Motivated by the license change and the streamlined deployment of the featurerich OpenSearch project as a fully open-source environment, the decision was taken to migrate the service at CERN towards it. The migration required a complete architectural redesign to accommodate the new modules while upholding the established standards of resource efficiency. The new service not only introduced a wide range of additional capabilities but also resolved longstanding maintainability issues while meeting the growing demands of various use-cases. At the time of writing, CERN’s service comprises 42 OpenSearch and 41 OpenDistro clusters in active production, plus 28 OpenSearch development clusters. This article covers the motivation, design, and implementation of this transition, highlighting the challenges encountered throughout the process.
PDF
