Tanggapan Orang Tua/wali Terhadap Proses Pembelajaran Renang Pada SMA Negeri 4 Kota Banda Aceh Tahun Ajaran 2014/2015

Penelitian yang berjudul: “Tanggapan Orang Tua/Wali Siswa Terhadap Proses Pembelajaran Renang Pada SMA Negeri 4 Banda Aceh Tahun Ajaran 2014/2015”. Proses pembelajaran renang yang mengikuti kurikulum sekolah SMA Negeri 4 Banda Aceh ini untuk mengetahui bagaimana Tanggapan Orang Tua/Wali Siswa Terhadap Proses Pembelajaran Renang disekolah. Penelitian ini bertujuan untuk mengetahui Tanggapan Orang Tua/Wali Siswa Terhadap Proses Pembelajaran Renang Tahun Ajaran 2014/2015. Penelitian ini termasuk kedalam jenis penelitian deskriptif. Populasi penelitian ini adalah seluruh siswa SMA Negeri 4 Banda Aceh kelas I yang berjumlah 256 siswa. Penentuan sampel dilakukan secara Random Sampling, maka sampel di tetapkan sebanyak 25 orang dengan secara acak. Pengumpulan data dilakukan dengan menyebar angket atau kuesioner. Teknik analisis data dalam penelitian ini adalah menggunakan perhitungan persentase dan menghitung nilai rata-rata. Hasil penelitian menunjukkan bahwa nilai rata-rata yang diperoleh dari jumlah sampel 15 orang responden sebesar 57% dan sisanya berjumlah 10 orang adalah 43% disebut kurang dari setengah. Dengan demikian, Tanggapan Orang Tua/Wali Siswa Terhadap Proses Pembelajaran Renang Pada SMA Negeri 4 Banda Aceh Tahun Ajaran 2014/2015 berada pada kategori lebih dari setengah

Analysis of the properties of a steering shaft used as a back-up for a steer-by-wire system during system failure

YesAn analysis is presented to determine the best selection criteria for the properties of a steering shaft to be used as a back-up apparatus for a steer-by-wire (SBW) system during system failure. The properties of interest are the steering-shaft stiffness and its damping coefficient. A mathematical model representing the failed state of an SBW system is derived, and a set of experiments to validate the model is presented. Once the model had been validated, further predictions of the car¿s handling behaviour for a range of steering-shaft properties and different road speeds were completed by simulations in MATLAB/Simulink. A minimum stiffness which did not cause the car to become unstable owing to overshoot was determined, and the minimum acceptable damping coefficient value was derived. It is concluded that the suggested stiffness and damping coefficient values increased the steering ratio, and the results of further investigations are presented, which confirm that the vehicle is safe to be driven in the event of SBW system failure if the recommended shaft properties are used

Design concepts and analysis of a semi-active steering system for a passenger car

YesThe fundamentals and preliminary analyses of an innovative future technology referred to as `semi-active steering' (SAS) are presented in this article. The proposed steering system configuration is similar to a conventional electrical power-assisted steering with the replacement of the rigid steering shaft with a low stiffness resilient shaft (LSRS), the presence of which allows `active control¿ to be performed on vehicles similar to the concept of full steer-by-wire (SBW). But, unlike SBW, the LSRS is an integral part of the system characteristics. The advantages of the semi-active system in comparison with SBWand other conventional systems are demonstrated. A mathematical model to predict the mechanical properties of the LSRS has been developed, and experiments were conducted on a medium-sized car fitted with an LSRS to verify that vehicle stability and drivability can be ensured in the event of active system failure. The results have indicated that the vehicle was stable and safe to be driven at low speeds, and is predicted to be driveable and safe at higher speeds. It is concluded that an SAS system of this type has the potential to improve the safety of SBW systems

Time Resolved Correlation measurements of temporally heterogeneous dynamics

Time Resolved Correlation (TRC) is a recently introduced light scattering technique that allows to detect and quantify dynamic heterogeneities. The technique is based on the analysis of the temporal evolution of the speckle pattern generated by the light scattered by a sample, which is quantified by $c\_I(t,\tau)$, the degree of correlation between speckle images recorded at time $t$ and $t+\tau$. Heterogeneous dynamics results in significant fluctuations of $c\_I(t,\tau)$ with time $t$. We describe how to optimize TRC measurements and how to detect and avoid possible artifacts. The statistical properties of the fluctuations of $c\_I$ are analyzed by studying their variance, probability distribution function, and time autocorrelation function. We show that these quantities are affected by a noise contribution due to the finite number $N$ of detected speckles. We propose and demonstrate a method to correct for the noise contribution, based on a $N\to \infty$ extrapolation scheme. Examples from both homogeneous and heterogeneous dynamics are provided. Connections with recent numerical and analytical works on heterogeneous glassy dynamics are briefly discussed.Comment: 19 pages, 15 figures. Submitted to PR

Syrian Refugees and the Digital Passage to Europe: Smartphone Infrastructures and Affordances

This research examines the role of smartphones in refugees’ journeys. It traces the risks and possibilities afforded by smartphones for facilitating information, communication, and migration flows in the digital passage to Europe. For the Syrian and Iraqi refugee respondents in this France-based qualitative study, smartphones are lifelines, as important as water and food. They afford the planning, navigation, and documentation of journeys, enabling regular contact with family, friends, smugglers, and those who help them. However, refugees are simultaneously exposed to new forms of exploitation and surveillance with smartphones as migrations are financialised by smugglers and criminalized by European policies, and the digital passage is dependent on a contingent range of sociotechnical and material assemblages. Through an infrastructural lens, we capture the dialectical dynamics of opportunity and vulnerability, and the forms of resilience and solidarity, that arise as forced migration and digital connectivity coincide

Evaluation of the implementation of school exams using the brinkerhoff model in physics subjects in senior high school

School exam is one of the benchmarks of student learning outcomes as a test that is expected to provide information on the ability of students that can be used to consider and describe the achievement of students, especially in physics subjects. This study aims to describe the suitability of fixed vs. emergent design, formative vs. summative design, experimental design, and quasi-experimental vs. natural inquiry evaluation of the implementation of school exams in physics subjects in high school. This research uses the Brinkerhoff evaluation model proposed by Robert O. Brinkerhoff. The method used in this research is quantitative, and this type of research is evaluative. The data collection technique used a questionnaire, supported by observation and documentation, and a literature study to give meaning to the research results. The results showed that overall the organization of school exams in physics subjects in high school was very good. In the fixed vs. emergent design component, a total average of 95% is obtained from the teacher's perspective and 87% from the student's perspective, which is very good. Furthermore, for the formative vs. summative design component, a total average of 94% was obtained from the teacher's perspective and 88% from the student's perspective, which was in the excellent category. Then the experimental design and quasi-experimental vs. natural inquiry obtained a total average of 96% in the teacher's perspective and 88% in the student's perspective, which is in the excellent category. Thus, the implementation of school exams in physics subjects in high school is very good, but further research needs to be carried out to analyze, maintain, and at the same time improve what is lacking in terms of organizing school exams, starting from the preparation, implementation, and closing stages