scholarly journals PROPOSAL OF THE TESTING METHODS OF AIRFLOW RESISTANCE FOR VENT CAP AND EXPERIMENTAL STUDY ON INFLUENCE OF FLOW CAPACITY FOR DRAINAGE SYSTEM

2019 ◽  
Vol 84 (758) ◽  
pp. 417-426
Author(s):  
Norihiro HONGO ◽  
Masayuki OTSUKA ◽  
Kyousuke SAKAUE ◽  
Yuki KUGA
2012 ◽  
Vol 452-453 ◽  
pp. 538-542 ◽  
Author(s):  
Abdelkader Djehiche ◽  
Rekia Amieur ◽  
Mustafa Gafsi

This paper presents an experimental study of a homogenous earth dam. The work is focused to the search of solutions of problems encountered in the earth dams after their construction. One of the major problems is the choice and design of systems of drainage. The effective drainage system to prevent harmful accumulations of excess water is one of the most important roles of dams. Efficient drainage systems can improve the safety of earth dams. The paper presented herein reports the results obtained from the experimental study. Empiric relations have been obtained which can be help in the control of the flow rate in the chimney drain of the earth dams on pervious foundation, which can increase safety earth dams


2014 ◽  
Vol 4 (3) ◽  
pp. 66-72
Author(s):  
Sayriddin Shakhobovich SAYRIDDINOV

Рresents the results of experimental research which allow to give engineering-based recommendations about determination of waves characteristics in interaction with local vertical narrowing of the riverbed and improve methods of calculation and designing of hydraulic and engineering objects, water supply and drainage system.


2016 ◽  
Vol 53 (4) ◽  
pp. 286-290
Author(s):  
Geng Chen ◽  
Yonghui Chen ◽  
Chang-Guang Qi ◽  
Long Chen

Author(s):  
Hiroshi Kanazawa ◽  
Fumihiko Matsukawa ◽  
Kazumasa Katoh ◽  
Iwao Hasegawa

2001 ◽  
pp. 53-62
Author(s):  
Yasumasa TOJO ◽  
Nobutoshi TANAKA ◽  
Toshihiko MATSUTO ◽  
Takayuki MATSUO

Author(s):  
Charles Freeman ◽  
Reuben Burch ◽  
Lesley Strawderman ◽  
Catherine Black ◽  
David Saucier ◽  
...  

Research surrounding the mandated use of non-medical fabric masks is inconsistent and often confusing when compared to the standard N95. A recently published standard from ASTM International and the Centers for Disease Control and Prevention attempts to normalize evaluation procedures. The purpose of this study is to conduct a preliminary evaluation of the new methods for testing filtration efficiency of masks outlined by ASTM International F3502, where results can be directly compared to standards outlined for non-medical fabric masks. Eleven consumer non-medical fabric masks were tested for filtration efficiency and airflow resistance using a face filtration mount in accordance with the newly released ASTM International standard for facial barriers. The mean FE% (SD) ranged from 0.46% (0.44) to 11.80% (2.76) with the 3-layer athletic mesh having the highest performance and the highest deviations. All the masks tested following the procedure failed to meet to minimum FE of 20%; however all masks performed below the minimum upper limits for airflow resistance. Using a non-medical fabric masks as the sole mitigation strategy may not be as effective, as previously reported. With efforts to standardize and regulate the non-medical fabric mask market, this study demonstrates a variety of currently available consumer mask products do not meet the minimum standards nor are these remotely close to the standards of surgical or N95 masks.


Author(s):  
Hendi Matalata

The city of Jambi is an area batanghari river, the study of the utilization of renewable energy, especially hydro power through the tributaries should be considered for the planning of Micro Hydro Power Plant (PLTMH). Water conditions that can be utilized as electricity generating resources have a certain flow capacity and altitude of their drainage system. A major problem in hydroelectric generation is the availability of river water discharge as a propulsion energy. Therefore, certain techniques are needed to predict the potential flow of river water at all times or the river's main discharge that can be used for hydro-electric power generation, no long-term rainfall and critical watershed conditions can cause water flow the stream becomes small and even becomes dry. Manual river flow measurements over time can only represent the volume of river flow at the time of measurement. Changes that occur due to the occurrence of rain at a later time, or decrease in river discharge due to decreased soil water savings, can not be monitored properly it is necessary to plan a continuous discharge for the capacity of generator turbine rotation by calculating the electrical capacity of the generator which can be generated optimally


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