The Dynamic Mathematics Software for Teaching Variance

Abstract. In traditional teaching, many teachers often ignore the process of students' knowledge exploration, devote themselves to instilling knowledge to students in a short time, and then adopt the sea of questions tactics. Such teaching is only limited to the stage of telling students what "variance" is and how to use it, and ignores the birth process and meaning of "variance". The purpose of this research is to see the differences in classes that use dynamic mathematics software and traditional classes. The method in this research is descriptive qualitative. The sample in this study was seventh-grade students at one of the junior high schools in China. The content of this research design is the use of dynamic mathematics technology, focusing on the understanding of the concept of efficiency-improving variance, and the form innovation of the course design is design and record before and after optimization-evaluation and analysis before and after optimization. This article mainly takes the concept of teaching variance topic as an example to try to explore the teaching design of optimizing the important and difficult points of mathematics. This study shows that Hawgent dynamic mathematics software makes students get deep learning and makes teaching and learning activities more active. Then the teacher can continue to use Hawgent dynamic mathematics software to make students more active.   Abstrak. Dalam pengajaran tradisional, banyak guru sering mengabaikan proses eksplorasi pengetahuan siswa, fokus menanamkan pengetahuan kepada siswa dalam waktu singkat, dan kemudian memberi banyak soal untuk diselesaikan. Pengajaran semacam itu hanya sebatas tahap memberi tahu siswa apa itu "varians" dan bagaimana menggunakannya, serta mengabaikan proses penemuan konsep dan makna "varians". Tujuan dari penelitian ini adalah untuk melihat perbedaan kelas yang menggunakan dynamic mathematics software dan kelas tradisional. Metode dalam penelitian ini adalah deskriptif kualitatif. Sampel dalam penelitian ini adalah siswa kelas tujuh di salah satu sekolah menengah pertama di China. Desain penelitian ini adalah pemanfaatan teknologi dynamic mathematics software, menitikberatkan pada pemahaman konsep varians, dan inovasi bentuk rancangan penelitian rekam sebelum dan sesudah optimalisasi-evaluasi dan analisis sebelum dan sesudah optimasi. Artikel ini terutama mengambil konsep pengajaran pada bahasan varians sebagai contoh untuk mencoba mengeksplorasi desain pengajaran dalam mengoptimalkan poin-poin matematika yang penting dan sulit. Penelitian ini menunjukkan bahwa dynamic mathematics software Hawgent membuat siswa mendapatkan pembelajaran yang mendalam dan membuat kegiatan belajar mengajar menjadi lebih aktif. Oleh karena itu, guru dapat menggunakan dynamic mathematics software Hawgent untuk membuat siswa lebih aktif

A novel process for nutrients removal and phosphorus recovery from domestic wastewater by combining BNR with induced crystallization

An excessive discharge of phosphorus from wastewater to water bodies may potentially contribute to eutrophication. On the other hand, mineral phosphorus resources will be depleted in the near future, because of difficulty to automatically recycle from water to land, unlike nitrogen. A new process for nutrients removal coupled with phosphorus recovery was proposed in this study by combining biological nutrients removal (BNR) with induced crystallization (IC), BNR-IC for short later, differently from conventional phosphorus recovery process. Our results showed that the BNR-IC system can maintain not only high and stable carbon, nitrogen and phosphorus removal efficiencies, all presenting above 90%, but also good phosphorus recovery performance from synthetic domestic wastewater, displaying about 70.2% of phosphorus recovery rate. When the COD, TN, NH4–N and P concentrations of 250 mg L−1, 42 mg L−1, 40 mg L−1, and 10 mg L−1, respectively were given in the influent, a stable removal efficiencies of 92.5% COD, 78.6% TN, 85.9% NH4–N and 95.2% P were obtained for the BNR-IC process and correspondingly the COD, TN, NH4–N and P concentrations of 18.75 mg L−1, 8.99 mg L−1, 5.64 mg L−1, 0.42 mg L−1 were monitored in the effluent, meeting the Chinese National Class I (grade A) Sewage Discharge Standard. Analyses of SEM and EDS, moreover, also demonstrated that the surface of seed crystal (calcite used here) was completely covered by hydroxyl calcium phosphate (HAP) produced during the induced crystallization process to recover phosphorus. Although our study involved only a small-scale trial, the proposed BNR-IC process here may be a promising technology, and can potentially aid in improvement of the effluent quality from WWTP and in recycle of mineral phosphorus resources when applied to practice

Additive Manufacturing Of (MgCoNiCuZn)O High-entropy Oxide Using A 3D Extrusion Technique And Oxide Precursors

This report presents an additive manufacturing approach, for the first time, to producing high-entropy oxides (HEOs) using a 3D extrusion-based technique with oxide precursors. The precursors were prepared by a wet chemical method from sulfates. Additives were utilized to optimize the rheological properties of the printing inks with these precursors, and the properties of the printed HEOs were improved by increasing the solid content of the inks. When ink with a solid content of 78 wt% was used for printing, the resulting HEO exhibited a relative density of 92% and a high dielectric constant after undergoing pressure less sintering at 800 °C. Compared to traditional methods of manufacturing HEOs, the 3D extrusion technique is a very promising method for producing HEOs with complex geometries