An Origami Paper-Based Analytical Device for Rapid and Sensitive Analysis of Acrylamide in Foods

Rapid and sensitive detection of acrylamide in food samples is important for food safety and public health. Here, we describe a disposable origami paper-based analytical device (denoted doPAD) for colorimetric detection of acrylamide. This device uniquely exploits 3D origami folding paper for spatial control of the target recognition and signal readout, thus resulting in a positive correlation between the signals and the analytes. Under optimal conditions, the device achieved the quantitative analysis of acrylamide with a limit of detection of 1.13 μg/L within 120 min (including a derivatization time of 90 min and an assay time of 21 min). Furthermore, our method allowed the rapid and sensitive detection of acrylamide in complex food matrices. We envision that the platform described will find useful applications in the fields of food safety and environmental health.

Implementasi Model Pembelajaran Cooperatif Learning Dengan Media Konkret Untuk Meningkatkan Hasil Belajar Muatan Pelajaran Matematika Siswa Kelas I SD Negeri 1 Seraya Barat

This classroom action research was carried out in two cycles with the aim of improving the learning outcomes of mathematics lessons for Class I students of SD Negeri 1 Seraya Barat. The subjects of this study were Class I students of SD Negeri 1 Seraya Barat with a total of 30 students consisting of 13 female students and 17 male students. Data were collected using the test method. The collected data was then analyzed by qualitative descriptive statistics. The results of the study show that the implementation of cooperative learning models with concrete media can improve learning outcomes for mathematics lessons. The success of implementing cooperative learning models with concrete media can be seen from the learning process that is more active for students. All students were actively involved in taking turns demonstrating counting division and enthusiastically presenting the results of their work, namely calculating the division of natural numbers in front of the class according to the questions that had been selected. The implementation of cooperative learning models with concrete media is carried out using the help of straws, plastic cups and folding paper. The success of implementing cooperative learning models with concrete media is also evidenced by the increase in the average value of learning outcomes achieved at the end of the first cycle, which is 74.89 and the average value of learning outcomes achieved at the end of the second cycle, which is 86.44. Based on these results, the average value of learning outcomes from cycle I to cycle II increased by 11.55. The percentage of students who achieved KBM from cycle I to cycle II also increased by 26.66%, from 66.67% to 93.33%.

Enactive or symbolic representation? When the order alters the product

<p>This paper reviews a pedagogic exercise related to the degree of Architecture being taught at the University of Chile. This exercise, which is based on the action of folding paper, integrates knowledge areas from the project learning in initial phases. To illustrate this, in the methodology section, the applied didactic strategy together with its theoretical sustenance are described and then followed by both a review of the activities of the project itself and the learning results. The exercise addresses the multidisciplinary features of our field in Architecture, since it encourages students to directly and intuitively solve physical, structural, geometric, aesthetic and functional issues in an integral manner, appealing and adding to their already acquired ability to do and think in an enactive manner. The outcome of this exercise gets deep into the relationship among a number of aspects which include the type of representation incidence in the projecting operation (iconic, symbolic and enactive representations) and its directions, i.e., from enactive to symbolic representation and vice versa. Furthermore, it also lays out the didactic strategies and teaching contributions of the study case. To conclude, the relevance of this practical approach concerning the relationship between form with these three types of representation is discussed, so students may apply their knowledge and experience acquired during their life in the first stages of their architectural training at university.</p>

Comparing Concentration Levels and Emotional States of Children Using Electroencephalography during Horticultural and Nonhorticultural Activities

This study aimed to compare the brain activity and emotional states of elementary school students during horticultural and nonhorticultural activities. A total of 30 participants with a mean age of 11.4 ± 1.3 years were included. This experiment was conducted at Konkuk University campus in Korea. Participants performed horticultural activities such as harvesting, planting, sowing seeds, and mixing soil. Nonhorticultural activities included playing with a ball, solving math problems, watching animation videos, folding paper, and reading a book. The study had a crossover experimental design. Brain activity of the prefrontal lobes was measured by electroencephalography during each activity for 3 minutes. On completion of each activity, participants answered a subjective emotion questionnaire using the semantic differential method (SDM). Results showed that relative theta (RT) power spectrum was significantly lower in both prefrontal lobes of participants when engaged in harvesting and reading a book. The relative mid beta (RMB) power spectrum was significantly higher in both prefrontal lobes when participants engaged in harvesting and playing with a ball. The ratio of the RMB power spectrum to the RT power spectrum reflects concentration. This ratio increased during harvesting activity, indicating that children’s concentration also increased. The sensorimotor rhythm (SMR) from mid beta to theta (RSMT), another indicator of concentration, was significantly higher in the right prefrontal lobe during harvesting than during other activities. Furthermore, SDM results showed that the participants felt more natural and relaxed when performing horticultural activities than nonhorticultural activities. Horticultural activities may improve brain activity and psychological relaxation in children. Harvesting activity was most effective for improving children’s concentration compared with nonhorticultural activities.

Geometry-Based Thick Origami Simulation

Origami is the art of creating a three-dimensional (3D) shape by folding paper. It has drawn much attention from researchers, and the designs that origami has inspired are used in various engineering applications. Most of these designs are based on familiar origami patterns and their known deformations, but origami patterns were originally intended for materials of near-zero thickness, primarily paper. To use the designs in engineering applications, it is necessary to simulate origami in a way that enables designers to explore and understand the designs while taking the thickness of the material to be folded into account. Because origami is primarily a problem in geometric design, this paper develops a geometric simulation for thick origami. The actuation, constraints, and assignment of mountain and valley folds in origami are also incorporated into the geometric formulation. The experimental results show that the proposed method is efficient and accurate. The method can successfully simulate a flat-foldable degree-four vertex, two different action origami, the bistable property of a waterbomb base, and the elasticity of non-rigid origami panels.

Bagaimana Mengembangkan Kemampuan Spasial dalam Pembelajaran Matematika di Sekolah?: Suatu Tinjauan Literatur

Spatial ability is an important one of the abilities for completing many tasks in everyday life successfully. Spatial ability is considered a type of different ability to others. Therefore, there needs a study on how are the characteristics of spatial abilities and to develop in schools. This paper is to reveal the ways are developing spatial abilities in learning mathematics. Based on literature review from some research, at least that there are six ways to develop spatial abilities in learning mathematics, namely: (1) using spatial language in daily interactions; (2) teaching for sketching and drawing; (3) using a suitable game; (4) using a tangram; (5) using video games; and (6) origami and folding paper. Playing video games like Tetris are exercises for spatial relations, mental rotation, spatial orientation, and spatial visualization.

Origami and space research: classroom activities

&lt;p&gt;When origami is mentioned, the first associations are paper cranes.&amp;#160; But origami is much more, and it is actually a mathematical discipline, so powerful that even NASA uses origami in its space research. Flat origami, where figures are as such as the above mentioned crane, is full of mathematical problems. There are seven origami axioms, widely known as Huzita-Hatori axioms, that describe creases. They represent the mathematically formal description of origami constructions. But when talking about involving origami and space science, we need to mention Miura folding &amp;#160;This form of origami folding is proposed by Japanese astrophysicist Koryo Miura. Miura-ori is a way of folding paper or another flat surface into smaller area.&amp;#160; In the presentation we describe how we have made Miura-ori folding, how we 3D printed and made a model of a space craft in our classroom. Connecting different disciplines and inquiry students learned about the most recent scientific research and applied their knowledge during the project.&amp;#160;&lt;/p&gt;

ORIGAMI: AN ALTERNATIVE MEDIA TO TEACH PROCEDURE TEXT IN SPEAKING

Procedure text is the text that has to be mastered by senior high school. The purpose of the text is to give a clue how to do something through some steps. The students should experience the lesson in order to help them to know that activity is on their daily life and to apply the worldly education "learning to do" and to make class more lively and communicative. Experiencing the objective above, there are many kinds of media that can be used to motivate the students to learn procedure text orally. One of them is using "origami" (it's the art or process, originating in Japan, of folding paper into shapes representing objects such as flowers, animal and furniture etc.). This study is conducted using a descriptive qualitative research with non-participant researcher. The subject is the students of senior high school in Mojokerto. In doing the observation, the data are collected by observing the activity during the class, the result of observation checklist and the result of questionnaire. Using "origami" as an alternative media to teach procedure text in speaking class is expected to attract the students' interest; it can give the students' opportunities to feel a variety in teaching learning process. "Origami" helps the students increase motivation, enthusiasm, and become easy to practice their language orally. In carrying out "origami", the teacher selects "origami" for beginner because the models can be found in around their house or school. They enable the students to instruct orally. "Origami" is a good media in learning procedure text orally because it can give fun and relaxation and break up the routine class activity. Furthermore, the students experience and understand what they learn.Keywords: Origami, An alternative media, Procedure text, Speaking class

Kemampuan Motorik Halus Anak melalui Kegiatan Melipat Kertas Origami

The phenomenon needing to consider at this time is the lack of development of fine motor children in the daily activity. Simple things such as buttoning their clothes, combing their hair, wearing shoelaces, folding their clothes, in fact, are difficult to do for children in Taman Kanak-Kanak Raisyah Padangsidimpuan. Therefore, this study aimed to improve children's fine motor skills through folding paper origami. This type of research used classroom action research consisting of 2 cycles. The research was carried out in Taman Kanak-Kanak Raisyah Padangsidimpuan in group B with 15 children consisted of 9 boys and 6 girls. Based on the results found through observation techniques, interviews, tests, and documentation, it was concluded that folding paper origami can improve the fine motor skills of children in group B of Taman Kanak-Kanak Raisyah Padangsidimpuan. It could be seen from the achievement value in the first cycle stage only 33%. Whereas after the second cycle was done, the achievement of the value obtained reached 86%.