Observations on Performing Sine Waves with an Oscillator Ensemble

Founded in 2016 at Université de Montréal, Ensemble d’oscillateurs (French for Oscillator Ensemble) brings together ten musicians around old analog test equipment oscillators that produce audio sine waves. The ensemble performs new compositions while also arranging early electronic pieces. In parallel, the project developed itself as a space to gather information and reflect on sine wave-based music. This article presents some of the key considerations and challenges in the formation of Ensemble d’oscillateurs. Based on the observations made throughout the development of a body of work using these audio oscillators, it then aims to open a discussion on some aspects of the historical trajectory of the use of sine waves in modern music.

The Canadian Planetary Emulation Terrain Energy-Aware Rover Navigation Dataset

Future exploratory missions to the Moon and to Mars will involve solar-powered rovers; careful vehicle energy management is critical to the success of such missions. This article describes a unique dataset gathered by a small, four-wheeled rover at a planetary analog test facility in Canada. The rover was equipped with a suite of sensors designed to enable the study of energy-aware navigation and path planning algorithms. The sensors included a colour omnidirectional stereo camera, a monocular camera, an inertial measurement unit, a pyranometer, drive power consumption monitors, wheel encoders, and a GPS receiver. In total, the rover drove more than 1.2 km over varied terrain at the analog test site. All data is presented in human-readable text files and as standard-format images; additional Robot Operating System (ROS) parsing tools and several georeferenced aerial maps of the test environment are also included. A series of potential research use cases is described.

Screening Using the SDQ Total Difficulties Scale: An Analog Test of Three Cutoff Values

This brief report presents an analog test of the relative classification validity of three cutoff values (CVs; 16, 18, and 20) derived from responses to the self-report version of the Strengths and Difficulties Questionnaire: Total Difficulties Scale. Results from Bayesian t-tests, using several school-specific subjective well-being indicators as dependent variables, yielded evidence suggesting all CV models effectively differentiated between students with lower and higher levels of risk. Evidence also indicated that the lowest CV (16) was more effective than the higher CVs (18, 20) at identifying students with greater levels of risk, and that the higher CVs functioned comparably well. Implications for future research and practice are noted.

Screening Using the SDQ Total Difficulties Scale: An Analog Test of Three Cutoff Values

This brief report presents an analog test of the relative classification validity of three cutoff values (CVs; 16, 18, and 20) derived from responses to the self-report version of the Strengths and Difficulties Questionnaire: Total Difficulties Scale. Results from Bayesian t-tests, using several school-specific subjective well-being indicators as dependent variables, yielded evidence suggesting all CV models effectively differentiated between students with lower and higher levels of risk. Evidence also indicated that the lowest CV (16) was more effective than the higher CVs (18, 20) at identifying students with greater levels of risk, and that the higher CVs functioned comparably well. Implications for future research and practice are noted.

Evaluasi Nilai Stabilitas dan Flow Campuran AC-BC Pada Penggunaan Alat Uji Marshall Analog dan Digital

Abstrak Alat uji Marshall digunakan untuk mengetahui stabilitas terhadap kelelehan plastis (flow) dan MQ dari lapis perkerasan AC-BC. Tipe alat pengujian Marshall dapat berupa analog dan digital. Alat uji analog dengan pembacaan data manual sangat bergantung pada ketrampilan operator. Alat uji digital menggunakan sistem komputer, sehingga menghasilkan data maksimum dengan operator minimum. Penelitian dilaksanakan berdasarkan SNI 06-2489-1991 pada campuran AC-BC dengan lima variasi kadar aspal. Hasil pengujian didapatkan nilai rata-rata alat uji analog pengamatan langsung: stabilitas (kg) = 1490,49; Flow (mm) = 4,48; MQ (kg/mm) = 335,55. Alat uji analog pengamatan perekaman video: stabilitas (kg) = 1482,91; Flow (mm) = 4,44; MQ (kg/mm) = 336,48. untuk alat uji digital menghasilkan stabilitas (kg) = 1508,36; Flow (mm) = 4,42; MQ (kg/mm) = 342,93. Berdasarkan analisa perbedaan tiga rata-rata menunjukkan tidak terdapat perbedaan signifikan hasil pengujian menggunakan alat uji Marshall analog pengamatan langsung, perekaman video dan digital. Kata kunci: campuran AC-BC, karakteristik Marshall, alat uji marshall analog dan digital Abstract Marshall test-equipment is used to determine the stability of the flow and MQ of AC-BC pavement. It can be an analog and a digital test-equipment. Analog test-equipment reading the data manually dependens on the operator skills. While the digital test equipment uses a computer system produces maximum data with minimum operator. The research is conducted based on a mixture SNI 06-2489-1991 AC-BC with five variation of asphalt content. The presumptions of the test result of Marshall characteristic are found out as: the direct observation-analogue gets the stability (kg) = 1490.49; Flow (mm) = 4.48; MQ (kg / mm) = 335.55. The visualization analogue gets the stability (kg) = 1482.91; Flow (mm) = 4.44; MQ (kg / mm) = 336.48. The digital test-equipment gets the stability (kg) 1508.36; Flow (mm) = 4.42; MQ (kg / mm) = 342.93. Based on the three different analysis evenly show that there are no different significantly from the test result by using the direct observation-analogue, the visualization analogue, and the digital Marshall test-equipment. Keywords: AC-BC mixtures, Marshall charactheristik, analog and digital Marshall test equipment