Study on thrust force and torque sensor signals in drilling of Al/CFRP stacks for aeronautical applications

Abstract Multi-material stack products made of carbon fibre reinforce polymers (CFRP) and light-weight metal alloys, such as aluminium alloys, are becoming increasingly employed for aerospace applications. When composite laminates are stacked with metal alloy sheets, the drilling process becomes more complex due to the diverse properties of the stacked materials which involve different wear mechanisms and different drilling parameters. In this framework, the aim of this paper is to investigate the drilling process of Al/CFRP stacks for aeronautical applications through an experimental testing campaign under different drilling conditions. In order to study the thrust force and torque generated during the drilling process, a multiple sensor system is employed for data acquisition, and an advanced methodology for sensor signal processing in the time and frequency domain is developed

PENGELOLAAN KANTIN SEHAT DI SDN 6 BUKIT TUNGGAL PALANGKA RAYA

Abstrak: Penelitian ini bertujuan untuk mendeskripsikan pengelolaan kantin sehat di SDN 6 Bukit Tunggal Palangka Raya. Penelitian ini menggunakan pendekatan kualitatif dengan rancangan studi kasus. Sumber data penelitian terdiri dari kepala sekolah, guru dan para pedagang kantin sekolah. Pengumpulan data dilakukan dengan teknik observasi, wawancara, dan studi dokumentasi. Teknik analisis data dilakukan dengan tahapan: reduksi data, penyajian data dan verifikasi atau penarikan kesimpulan. Hasil penelitian menunjukkan bahwa: (1) proses perencanaan kantin sehat dilakukan dengan tahapan mulai dari identifikasi kebutuhan layanan kantin sehat hingga penetapan jadwal kegiatan kantin sehat; (2) pengorganisasian kantin sehat dilakukan dengan menetapkan struktur organisasi kantin beserta tugas serta tanggungjawab pengelola kantin; (3) pelaksanaan kantin sehat dikelola sekolah bersama penjaga kantin; dan (4) pengawasan kantin sehat dilakukan secara internal oleh pihak sekolah dan eksternal dengan melibatkan stakeholders seperti: Badan POM, Puskesmas Kayon, dan Dinas Lingkungan Hidup. Abstract: This study aims to describe the management of a healthy canteen at SDN 6 Bukit Tunggal Palangka Raya. This study used a qualitative approach with case study design. Sources of research data consisted of school principals, teachers and school canteen traders. The data was collected by means of observation, interview and documentation study. The data analysis technique was carried out in stages: data reduction, data presentation and verification or drawing conclusions. The results showed that: (1) the planning process for a healthy canteen was carried out with stages starting from identifying the need for healthy canteen services to establishing a schedule for healthy canteen activities; (2) the organization of a healthy canteen is carried out by determining the organizational structure of the canteen and the duties and responsibilities of the canteen manager; (3) implementation of a healthy canteen managed by the school together with the canteen guard; and (4) supervision of the healthy canteen is carried out internally by the school and externally by involving stakeholders such as: the POM, Kayon Puskesmas, and the Environmental Agency. References: Adriani, M., & Wirjatmadi, B. (2013). Pengantar Gizi Masyarakat. Jakarta: Kencana Prenada Media Group. Daryanto., & Farid, M. (2013). Konsep Dasar Manajemen Pendidikan di Sekolah. Yogyakarta: Gava Media Februhartanty, J., Iswarawanti, D. N., Ermayani, E., Meiyetriani, E., Laras, I. P., & Astuti, R. D. (2018). Pengembangan Kantin Sehat Sekolah. Jakarta: Southeast Asian Ministers of Education Organization Regional Centre for Food and Nutrition SEAMEO RECFON. Hanum, S. M. F., & Latifah, F. N. (2019). PKM Kantin Sehat SMP di Kecamatan Porong Kabupaten Sidoarjo Jawa Timur. Jurnal ABDINUS: Jurnal Pengabdian Nusantara, 2(2), 159-168. doi: https://doi.org/10.29407/ja.v2i2.12407. Mavidayanti, H., & Mardiana. (2016). Kebijakan Sekolah dalam Pemilihan Makanan Jajanan pada Anak Sekolah Dasar. Unnes Journal of Health Education, 1(1), 71-77. Miles, M. B., & Huberman, A. M. (1994). Analisis Data Kualitatif Buku Sumber tentang Metode-Metode Baru. Jakarta: UI Press. Novariska, T. (2004). Prinsip Dasar Ilmu Gizi. Jakarta: PT Gramedia Pustaka Umum. Sagala, S. (2012). Administrasi Pendidikan Kontemporer. Bandung: Alfabeta. Soemanto, W. (1990). Psikologi Pendidikan Landasan Kerja Pemimpin Pendidikan. Jakarta: PT Rineka Cipta. Yusuf, L., Yulastri, A., Kasmita., & Faridah, A. (2008). Teknik Perencanaan Gizi Makanan: untuk Sekolah Menengah Kejuruan. Jakarta: Direktorat Pembinaan Sekolah Menengah Kejuruan, Direktorat Jenderal Pendidikan Dasar dan Menengah

Durability and variability of the acoustical performance of rubberized road surfaces

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Penyebab Kematian Maternal Di Kabupaten Malang Provinsi Jawa Timur Tahun 2010

Latar belakang: Angka kematian ibu masih tinggi di Indonesia. Penyebab kematian ibu yang terbesar adalah yaitu perdarahan dan eklampsia. Kabupaten Malang merupakan kabupaten di Provinsi Jawa Timur dengan kematian ibu yang cukup tinggi. Tujuan: Studi ini bertujuan untuk mengetahui penyebab kematian ibu di Kabupaten Malang Provinsi Jawa Timur tahun 2010. Metode: Sumber data yang digunakan yaitu dari Studi Tindak Lanjut Kematian Ibu Sensus Penduduk 2010 (STLKI SP 2010) yang kemudian dianalisa deskritif. Jumlah sampel adalah seluruh kematian ibu di Kabupaten Malang Provinsi Jawa Timur, sebesar 49 kasus. Hasil: Rasio kematian ibu di Kabupaten Malang tahun 2010 sebesar 92 per 100.000 kelahiran hidup. Kematian ibu terbesar adalah direct cause (79,6%). Berdasarkan pengelompokkan penyebab kematian ibu menurut ICD 10 WHO, maka penyebab terbesar kematian ibu di Kabupaten Malang Provinsi Jawa Timur adalah hipertensi dalam kehamilan (24%), lalu penyebab lain yang tidak spesifik (15%), dan perdarahan post partum sebesar (4%). Kesimpulan: Kematian ibu di Kabupaten Malang Provinsi Jawa Timur masih tinggi. Penyebab kematian tertinggi adalah hipertensi dalam kehamilan. Diperlukan upaya preventif dan kuratif berdasarkan penyebab kematian

Penerapan Model Pembelajaran Kooperatif Tipe Make a Match Untuk Meningkatkan Hasil Belajar IPA Siswa Kelas II SD Negeri 19 Muara Dua Kecamatan Siak Kecil

The research carried out base on the lowly of the result of IPAin grade IIth SDN 19 Muara dua which is about 62,00 within minimal completeness criterion stated is 65. Among 20 student, there was only 5 students were able to achieve the score of minimal completeness criterion stated. The purpose of this research is to improve student\u27s achievemet on science of the two graders in SDN 19 Muara dua with the application of Kooperatif tipeMake a Match model. This research was classroom action research consisting 2 cycles within 4 procedures : planning, doing, observing, and reflecting and each cycle consist of three meeting. Instruments on this research are syllabus, lesson plan, and student work sheet. Instrument for collecting data are observation sheet and test. Data which was collected were learning outcomes and teacher\u27s activities during lessons. After implementation of Make a Matchmodel it was abtained student\u27s outcomes in UH I within average 70,50 (improved from basic score (13,70%).The average score form UH II was 84,25(improved 19,50%). Teachers activities results in the first meeting of the first cycle was 62,50% (good category), and then 70,83% (good category) for the second meeting in cycle I. Meanwhile in the first meeting of the second cycle was 83,33% (very good category) and then 87% (very good category) for second meeting in cycle II. Students activity in the first meeting of the cycle I was 58,33% (fair category), 66,66% (good category) for the second meeting in the cycle I. And then in the first meeting of the second cycle was 75,00% (good category), 83,33% (very good category) for the second meeting in cycle II. Based on the result it can be concluded that implementation of Kooperatif tipe make a match model can IPA in two graders at SDN 19 Muara Du

Time Spent on Mobile Apps Matters: A Latent Class Analysis of Patterns of Smartphone Use among Adolescents

The aims of the present study are: (1) to determine classes of adolescents with homogeneous patterns of smartphone or social media use; and (2) to examine the level of distress across the empirically derived profiles. Three hundred and forty adolescents (Mage = 15.61, SD = 1.19; 38.2% females) participated in a cross-sectional survey. Participants provided objective trace data on time spent on smartphones and applications, as well as self-reported social media addiction, social media use intensity, online social comparison, emotion dysregulation, and psychological distress. Latent class analysis (LCA) with total smartphone use categorized participants into three classes. Participants in Class 3 (19%) showed a more impaired functioning profile, with a tendency towards social media addiction and greater levels of distress. LCAs with the amount of time devoted to specific applications are more heterogeneous, and results showed that heavy use of social media apps was not consistently connected to the most impaired psychosocial profiles. Although the amount of mobile screen time can be a characteristic of problematic users, the link between social media usage and an adolescent’s psychological characteristics is mixed. More research is needed to explore the interplay between mobile screen time and social media usage among adolescents

Parameters affecting noise emitted by ships moving in port areas

Only recently has noise been considered in the assessment of the sustainability of port infrastructures, after decades of unawareness. INTERREG Maritime projects unveiled problems that have been neglected so far, such as the lack of proper regulation and noise exposure assessments for citizens. While it is true that a port area includes a huge variety of possible noise sources, very few of them have been characterized from an acoustical point of view. INTERREG projects have boosted research in the field, and previous studies have dealt with noise produced by moving ships in ports. The present work starts from a previous measurement campaign used to obtain broadband and 1/3-octave-band noise emissions of moving ships, and it aims to explain their uncertainties. More than a month’s worth of continuous acoustic measurements and video recordings were deeply analyzed in order to obtain an input database that is as precise as possible. A multiple regression analysis was performed in order to understand the influence that parameters such as minimum distance, speed, and draught have on ships’ noise emissions, which were calculated using pass-by measurements, with a special focus on ferries. The minimum distance of each ship’s passage from the microphone was measured using a video recording with an innovative methodology, providing results with 3 m of uncertainty. Knowing which parameter is more influential would help in planning proper measurements for monitoring or for drafting correct guidelines. Draught was determined to be uninfluential in ferries’ noise emissions, while the minimum distance and speed relations were estimated and accounted for in the calculation of a refined sound power level. From a spectrum point of view, the frequencies from 500 Hz to 2.5 kHz were determined to be those that contributed the most to the noise produced by the transit of a ship, and they vary with speed. With the studied corrections, different ferry models resulted in similar noise emissions. The standard deviation of noise emitted was reduced by 0.5 dB (A), and the average was also improved by positioning the ships’ flow at the correct average minimum distance. Furthermore, the right placement of a source is also important in the acoustic mapping phase for a correct evaluation of the propagation of noise at a distance. The use of more precise input data is important for improving the output of acoustic propagation models during the assessment of port noise in the surrounding areas

Esculetin provides neuroprotection against mutant huntingtin-induced toxicity in huntington’s disease models

Huntington’s disease (HD) is a neurodegenerative disorder caused by an abnormal CAG trinucleotide repeat expansion within exon 1 of the huntingtin (HTT) gene. This mutation leads to the production of mutant HTT (mHTT) protein which triggers neuronal death through several mechanisms. Here, we investigated the neuroprotective effects of esculetin (ESC), a bioactive phenolic compound, in an inducible PC12 model and a transgenic Drosophila melanogaster model of HD, both of which express mHTT fragments. ESC partially inhibited the progression of mHTT aggregation and reduced neuronal death through its ability to counteract the oxidative stress and mitochondria impairment elicited by mHTT in the PC12 model. The ability of ESC to counteract neuronal death was also confirmed in the transgenic Drosophila model. Although ESC did not modify the lifespan of the transgenic Drosophila, it still seemed to have a positive impact on the HD phenotype of this model. Based on our findings, ESC may be further studied as a potential neuroprotective agent in a rodent transgenic model of HD

Dentin matrix protein 1 and dentin sialophosphoprotein in human sound and carious teeth: an immunohistochemical and colorimetric assay

Dentin matrix protein 1 (DMP1) and dentin sialophosphoprotein (DSPP) are extracellular matrix proteins produced by odontoblasts involved in the dentin mineralization. The aim this study was to compare the distribution of DMP1 and DSPP in human sound dentin vs human sclerotic dentin. Sixteen sound and sixteen carious human molars were selected, fixed in paraformaldehyde and processed for immunohistochemical detection of DMP1 and DSPP by means of light microscopy, transmission electron microscopy (TEM) and high-resolution field emission in-lens scanning electron microscopy (FEI-SEM). Specimens were submitted to a pre-embedding or a post-embedding immunolabeling technique using primary antibodies anti DMP1 and anti-DSPP and gold-conjugated secondary antibodies. Other samples were processed for the detection of DMP1 and DSPP levels. Dentin from these samples was mechanically fractured to powder, then a protein extraction and a protein level detection assay were performed. DMP1 and DSPP were more abundant in carious than in sound samples. Immunohistochemical analyses in sclerotic dentin disclosed a high expression of DMP1 and DSPP inside the tubules, suggesting an active biomineralization of dentin by odontoblasts. Furthermore, the detection of small amounts of these proteins inside the tubules far from the carious lesion, as shown in the present study, is consistent with the hypothesis of a preventive defense of all dentin after a noxious stimulus has undermined the tooth