Optimization of a Truss Structure Used to Design of the Manipulator Arm from a Set of Components

The design of a manipulator arm, which is built from a construction kit, is presented in this article. The procedure is based on the results of the discrete optimization of a truss structure and its application to a simple component system (assuming a predefined shape and material of components). A genetic algorithm is used to optimize the truss structure, and the results of the solution are verified on a simple task used in literature (the code was written in the Python language). The construction kit was inspired by Merkur®, and the article proposes several components with different shapes and materials. The construction kit and the optimization of the truss structure were used to design the manipulator arm. The truss topology has been predefined with respect to the construction set. The finite element method (software ANSYS®) was used to analyze the components (shell elements) and truss structures (linear analysis, buckling analysis, etc.). To validate the presented approach, the arm designed by topological optimization was used. The comparison shows that the use of components may be an alternative to topology optimization and additive manufacturing. The next step will be the modification of the presented method in order to minimize the differences between the simplified task used for optimization (truss structure-rod element) and the simulation composed of components (components assembly-shell element).

Analisis Rangkaian Jembatan Wheatstone Berbasis Simulasi PhET Pada Pembelajaran Fisika di SMA

Telah dilakukan penelitian rangkaian jembatan wheatstone berbasis simulasi PhET. Tujuan penelitian adalah menganalisis besar hambatan R1, R2, R3, dan R4 yang menyebabkan besar arus listrik yang melewati hambatan R5 nol dan tidak nol, Pengambilan data menggunakan aplikasi simulasi PhET circuit-construction-kit-ac-virtual-lab_en, oleh 11 kelompok praktikum: 32 peserta didik kelas XII IPA1 SMA Negeri 2 Kebumen semester ganjil tahun pelajaran 2019/2020, diperoleh simpulan; besar arus listrik yang melalui hambatan R5 menghasilkan nol, diperoleh dari analisis hasil perkalian silang antara R1 dengan R3 sama dengan hasil perkalian silang antara R2 dengan R4, rangkaian tersebut dalam keadaan seimbang dan besar arus listrik yang melalui R5 menghasilkan tidak nol, diperoleh dari hasil analisis perkalian silang hambatan R1 dengan R3 tidak sama dengan hasil perkalian silang antara R2 dengan R4, rangkaian tersebut dalam keadaan tidak seimbang. .Kata kunci: jembatan wheatstone, simulasi PhET

Construction Kit of RF-Blocks in Package Technologies

Advanced packages are necessary to cope with the requirements of 5G and radar technologies with 60 GHz and beyond. For proper RF design with rising package technology requirements demands for usage of predefined structures with predefined layout elements, manufactured and measured elements. This paper deals with an approach to have such elements available to build advanced types of packages in shorter time compared to classical approaches. The approach is a general approach but it is demonstrated with an advanced two-level package-on-package technology with a leading edge IC technology. It is also used explain the build-up of a construction kit of RF-blocks from the design phase of test structures up to measurement of such structures, qualification and model building. From the test structure more general structures can be derived and used in the design of future 5G applications. This enables better time-to-market, reduces cost and provides higher design validation in terms of first time right.

Quick-Erect Stopping System for Radiation Protection and Mine Rescue in Small-scale Mining

The Quick-Erect Stopping System (QESS) offers a new way of reducing the radon exposures of miners in Germany, especially during remediation work in old mines. The QESS is a light-weight, modular, and reusable construction kit of interlocking telescopic aluminum tubes, radon-proof foil, and expanding foam. It is designed to seal off radon-rich parts of galleries within only a few minutes. Originally, the QESS was developed to protect miners against radon exposures. Then, the QESS found the attention of several mine rescue teams at a German mining conference. The Student Mine Rescue of the Technical University Bergakademie Freiberg and the Wismut Mine Rescue carried out first mine rescue drills in Freiberg and Schlema. Additionally, a mine rescue drill was carried out by the Front Range Mine Rescue in the Edgar Experimental Mine of the Colorado School of Mines. These drills helped to improve the system and highlighted its potential for mine rescue operations. Now, the QESS is well-suited for small-scale mining. The QESS can be used to seal off galleries in only a few minutes to both protect miners from radon exposures and to support mine rescue operations. Moreover, the QESS was also successfully used in ventilation experiments.

PhET Aplication Program: Strategi Penguatan Pemahaman Pembelajaran Jarak Jauh pada Materi Radiasi Benda Hitam melalui Percobaan Berbantu Lab Virtual dan Media Sosial

This research aims to improve the understanding of black matter radiation by utilizing the PhET circuit-construction-kit-ac application in remote learning using Whatsapp social media, as well as utilizing virtual labs. This article is the best practice carried out in the even semester of 2019/2020 lesson in the students of the class XII IPA. The implementation of this learning strategy has a positive achievement, among others: 1) understanding and problem solving black objects radiation with distance learning becomes easier; 2) as a solution for conducting experiments in the application of distance learning that can be done online or offline; 3) can display real and visual radiation experiments of black objects and easy to operate; 4) Use of PhET circuit-construction-kit-ac based on basic concepts, rules or principles, prevailing agreements, and use of reasoning; 5) There are no constraints while implementing PhET circuit-construction-kit-ac in distance learning; 6) Training students' independence. The results showed: a) the presence of test solutions in distance learning; b) Students are more enthusiastic, with indications of collecting timely assignments, all the tasks provided completed by all students; c) Students can match the final test results using the PhET circuit-construction-kit-ac with qualitative calculations using the prevailing black-object radiation equation; and d) The increasing learning outcomes are quite significant.