Acoustic emission from composite materials

The two basic areas where the acoustic emission (AE) technique can be applied are materials research and the evaluation of structural reliability. This experimental method leads to a better understanding of fracture mechanisms and is an NDT technique particularly well suited for the study of propagating cracks. Experiments are described in which acoustic emissions were unambiguously correlated with microstructural fracture mechanisms. The advantages and limitations of the AE technique are noted

Editorial

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Pengendalian Sosial Orang Tua pada Anak dalam Menggunakan Smartphone di Dusun Sadong Kecamatan Sungai Ambawang

This thesis is titled “Parents Social Control on Children in Using Smartphones (The Study in Dusun Sadong, Sungai Ambawang District. A common problem of this research ishow the Parents Social Control on Children in Using Smartphones (The Study in Dusun Sadong, Sungai Ambawang District? As for the sub-issues: 1)how the parents repressive social control on children in using smartphones? And 2) how the parents persuasive social control on children in using smartphones?This research uses qualitative approach with descriptive method. Data collection techniques of observation, interview and documentation study with data collection tool of observation guide, interview guide, note book and archives. Informants in this research were parents and children. Positive impact for children using smartphones such as to facilitate children looking for tasks from school, entertainment, and introduce children to interact socially with peers through technology. However, the perceived impact is generally more negative impacts such as children less concentrated learning, lazy learning, declining learning outcomes, forgetful time, and others. The results of this research indicate that parents have done social control in children that are repressive and persuasive. Repressive social controls by parents on children in using smartphones through reprimands and punishment. Persuasive social controls by parents through invitations, appeals, directions, and guidance

Machining Process Monitoring System Using Audible Energy Sound Sensors

This work reports on the approach for the development of a machining process monitoring system based on audible sound sensors. Audible sound energy appears as one of the most practical techniques since it can serve to replace the traditional ability of the operator, based on his experience and senses (mainly vision and hearing), to determine the process state and react adequately to any machine performance decay. This technique has been attempted for decision making on machining process conditions but it has not been extensively studied yet for applications in industrial process monitoring. The main critical issues related to the employment of this technology in industry are the need to protect the sensor from the hazardous machining environment (cutting fluids and metal chips) and the environment noise (from adjacent machines, motors, conveyors or other processes) that may contaminate the relevant signals during machining. The principal benefits of audible sound sensors for machining process monitoring are associated with the nature of the sensors employed in the acquisition of the signals. These are, in general, easy to mount on the machine tool, in particular near the machining point, with little or no interference with the machine, the tool, the workpiece or the chip formation. Besides, these sensors, basically microphones, are easy to use in combination with standard phonometers or spectrum analysers. These characteristics of audible sound sensors make the realization of the monitoring procedure quite straightforward. In addition, their maintenance is simple since they only require a careful handling to avoid being hit or damaged. Accordingly, they usually provide for a favourable cost/benefit ratio. The key novelties of the approach proposed in this work are, on the one hand, the application of a systematic methodology to set up the cutting trials allowing for a better comparison with other similar experimental works and, as a result, the advance in the standardization for the development of such systems. On the other hand, the independent signal analysis of the noise generated by the machine used for the cutting trials and by the working environment allows to filter this noise out of the signals obtained during the actual material processing. Lastly, the possibility has been verified to apply the results of this approach for the development of process monitoring procedures based on sensors of a different type, in particular acoustic emission sensors, where the stress waves produced within the work material do not travel through air but only in the work material itself. The combined application of audible sound energy sensors and acoustic emission sensors could allow for the acquisition of more exhaustive information from both low frequency (audible sound) and high frequency (acoustic emission) acoustic signal analysis. This would decidedly contribute to the realization of the concept of sensor fusion technology for process monitoring

TRIZ based tool management in supply networks

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ENERGIZE LEARNERS TO USE SCIENTIFIC APPROACH AND INTERACTIVE MEDIA IN TEACHING SCIENCE

Abstract: Science competence is learning outcome of students achieved as the result of their exploration throughscience learning process that cover of tree aspects: 1) knowledge of science products, 2) science process skills, and3) scientific attitude. The objective of this research is to increase science competence of elementary students gradeIV through science learning process make use of scientific approach with interactive multimedia. Scientificapproach that used including 5 (five) learning phases, that areengage, explore, explain, elaborate, and evaluate.Learning multimedia that used including: 1) information computer technology (ICT) based multimedia, 2) manualmultimedia, and 3) simple science visual aid and science games card. The research method used in this research isclassroom action research. This research is conducted at two elementary schools that used curriculum 2013, thatare: SekolahDasar Pertiwi I and SD Polisi I Kota Bogor. This research is conducted during one semester that is firstsemester of year 2013/2014. Multimedia of learning science designed refers to learning themes on curriculum 2013,teacher’s book, and student’s book. The research findings are: 1) Implementation of scientific approach withinteractive multimedia is able to increase science competence of elementary students grade IV; 2) Nurturant effectof implementation of scientific approach with interactive multimedia is there is increasing of curiousity, interest,motivation, expectation, needs, and self-confidence of elementary school students’ grade IV in learning science.Implications of this research are to increase the science competence of students’ need creativity and innovation ofthe science teachers’ in designing science learning models and science multimedia so that science learning processhave more certain quality. And then, school as institution must complete ICT facilities and also supported byteachers’ science competencies to use it, so that learning science process is more interesting, fun, resourceful, andeffectively achieve the learning objectives.Keywords: science competence, interactive multimedia, and scientific approach

Disparitas Cakupan Persalinan Oleh Nakes, Anc Dan Umur Harapan Hidup Pada 5 Region Di Indonesia Tahun 2007

Background: Maternal Mortality Rate Indonesia ranks seventh of the nine countries in ASEAN. Low-labor coverage among one of the causes of maternal death. Maternity coverage in Indonesia is not all achieved the target. Objective: Disparity in maternity coverage information by health workers in Indonesia's policy priorities in the program. Methode: Data sourced from Riskesdas 2007, Susenas 2007 and IPM BPS 2007. In the initial analysis performed multivariate analysis with logistic regression. Outcome variables described descriptivel meaningful. Result: East Indonesia Region (NIT, NTB, Maluku, North Maluku, Papua and West Papua) occupies the lowest coverage of delivery by health workers other than 4 region. Conclusion: The target and action plan for Indonesia in the East Indonesia Region and the counties with the lowest coverage in each region should be prioritized in the program

PENGEMBANGAN BUKU SAKU MATERI MAMALIA DI TAMAN MARGASATWA RAGUNAN UNTUK MENINGKATKAN PENGUASAAN KONSEP SISWA

This study aims to develop a pocket book in learning biology in order to increase students enthusiasm for learning and is an effort to improve students mastery of concepts. The research was carried out on class X high school students. Data collection was carried out at Ragunan Wildlife Park, Jakarta. The research was carried out in the even semester of the 2019/2020 school year, January to June 2020. The method used in this study was the research and development method using the 4-D (Four D) model, namely Define, Design (Design). , Develop (Development), and Disseminate (Spread). The development of teaching materials is carried out in two stages, namely: Expert Validation and Revision of Learning Media. Based on the results of the study, it can be concluded that the pocket book Mammals of the Primate order which was developed with the define, design, develop stage has met the components that are in accordance with KD in the 2013 curriculum, the language used is easy to understand, the presentation of a pocket book that is full of color and the images shown are very supportive of the material. learning so that it can attract the readers attention. The Primate Order Mammals pocket book shows valid results and is suitable for use in biology learning. The average value of expert validation from the content / content aspect was 83.5 percent, the language aspect was 83 percent, and the presentation aspect was 82.5 percent

Advanced Ultrasonic Non-destructive Evaluation for Metrological Analysis and Quality Assessment of Impact Damaged Non-crimp Fabric Composites☆

Abstract Composite materials are nowadays massively utilized in a very large number of industrial applications. Thus, it has become essential to characterize the service behaviour they can provide depending on their working conditions. In this paper, the study of the influence of impact conditions on damage generation in high performance composite materials, consisting of non-crimp fabric composite laminates, is carried out through the application of an advanced ultrasonic non-destructive evaluation technique, known as full volume ultrasonic scanning. This technique is based on the pulse-echo immersion testing method and allows for the quantitative analysis of the internal material structure in the entire composite volume. The aim of the ultrasonic non-destructive evaluation analysis is the metrological characterization of the non-crimp fabric composite laminates in terms of actual thickness estimation and stacking sequence fiber orientation verification as well as their quality assessment in terms of impact damage development within the whole composite material volume

THE RATIONALITY OF ANTIBIOTICS THERAPY TOWARD CHILDREN WITH TYPHOID FEVER AT M.M. DUNDA HOSPITAL

Objectives: Typhoid fever is an acute systemic infectious disease in the small intestine caused by Salmonella enterica serotype typhi (Salmonella typhi) having the symptoms of fever a week or more with impairment of the gastrointestinal tract with or without impaired consciousness. The purpose of this study was to determine the rationality of antibiotic therapy in pediatric patients at M.M Dunda Limboto Hospital.Methods: This research belongs to non-experimental descriptive with retrospective data retrieval. The data used were obtained from 83 medical records of childhood typhoid patients during 6 months (June–November 2016) at the regional general hospital of M.M Dunda Limboto. These data were analyzed using the Gyssens criteria.Results: The results showed that the most antibiotics used by physicians were ceftriaxone 39% of the use of antibiotic quality which was category IIB 9%, category IIA 13%, and category 0 (rational) 52%.Conclusion: The rationality of antibiotic therapy in children with typhoid fever at M.M Dunda Limboto Hospital was 52% of the most antibiotics used, i.e. ceftriaxone (39%).Â