Temat: duration of contact - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Numerical investigation of impact of non-spherical particles with spin and multi-point contact
Autorzy:: Xu, Xindong
Yu, Kuahai
Yao, Shile
Xin, Shihong
Yue, Zhufeng
Li, Lei
Powiązania:: https://bibliotekanauki.pl/articles/1839669.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: nonspherical particles
sphere element combination method
multi-point contact
coefficient of restitution
collision duration
Opis:: This paper investigates the dynamic behavior of elastoplastic collision of several non-sphere particles through the spherical element combination method. The particles are cylinder, triangle and square particles, which are combined by 2, 3 and 4 spheres using the spherical element method, respectively. Results reveal that the collision of the evaluated irregular particles exhibits three contact styles, which are single point contact, instantaneous multi-point contact and sequential multi-point contact. Normal contact torque and frictional torque act together on the spin of a particle and causes sequential multi-point contact under certain conditions for square particles.
Źródło:: Journal of Theoretical and Applied Mechanics; 2021, 59, 3; 431-441
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: The Phenomenon of Medical Waste Recycling in Indonesia: Contact Time and Chlorine Dose as a Disinfectant with the Bio-Indicator Bacillus subtilis and Bacillus stearothermophilus
Autorzy:: Fikri, Elanda
Kurniati, Iis
Wartiniyati, -
Prijanto, Teguh Budi
Pujiono, -
Syarief, Osman
Khair, Amar Sharaf Eldin
Powiązania:: https://bibliotekanauki.pl/articles/1839585.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: recycling
medical waste
dosage
duration of contact
chlorine
disinfection
Opis:: Efforts that have been done to manage the Hazardous and Toxic waste into non-Hazardous and Toxic waste are done by emptying, shredding, washing, and rinsing at least 3 times and disinfecting using chlorine. This is in accordance with the Indonesian Regulation of Ministry of Health No. 27 of 2017, which has stated that surface cleaning is permitted to use 0.05% chlorine during the process. Furthermore, in the Indonesian Regulation of the Ministry of Environment and Forestry No.56 of 2015, the chemical disinfection process is permitted to use an additional 3–6% sodium hypochlorite (NaOCl). However, there are still differences in dosage and it has not been mentioned regarding the immersion period during the disinfection process on both of the regulations. The purpose of this study was to determine the difference in contact time and the dose of chlorine as a disinfectant on the number of Bacillus subtilis and Bacillus stearothermophilus in the medical waste recycling process. The research design used in this study was a Randomized Factorial Design with experimental research type. A total of 104 recyclable medical waste samples were taken, using 3 treatments and 6 repetitions. The average temperature of the chlorine solution at the contact time of 15 minutes, 30 minutes, and 45 minutes was 24.34 °C; 24,53 °C; and 24,54 °C respectively, while the average pH of the chlorine solution at the contact time of 15 minutes, 30 minutes, and 45 minutes was 8.344; 8,375; and 8,461 respectively. The results showed that there was no difference in the duration of contact and the dose of chlorine as a disinfectant in the medical waste recycling process with a p-value of 0.377. The percentage reduction in the number of Bacillus subtilis and Bacillus stearothermophilus before and after treatment was 99.99% based on 4 positive controls. The findings in this study were the duration of contact time and the effective dose used in the recycling process of medical waste, which was at a dosage of 0.03% with 45 minutes of contact time. The government needs to conduct a re-assessment regarding the recommended ideal dosage in the surface disinfection process so that it would not cause a potential risk to humans or the environment.
Źródło:: Journal of Ecological Engineering; 2021, 22, 4; 47-58
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "duration of contact" wg kryterium: Temat

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język