Investigations on Scuba Diving Regulators

2010 ◽  
Author(s):  
Jung-Chang Wang ◽  
Yu-Pin Tsai
Keyword(s):  
High Pressure ◽  
Numerical Method ◽  
Scuba Diving ◽  
The Self ◽  
Compressed Air ◽  
Key Factors ◽  
Pressure Regulator ◽  
Factors Affecting ◽  
System A ◽  
Breathing Apparatus

The paper utilizes numerical method with performance experiment to investigate the key factors affecting the performance of the Self-Contained Underwater Breathing Apparatus (SCUBA) system. A SCUBA system consists of a high pressure compressed air tank and a pressure regulator. The development of scuba diving is based on the invention of the regulator. The high pressure air carried by diver must be reduced to the pressure in the ambient environment by the regulator before the diver can breathe it. The life of the diver thus depends on the performance and stability of the regulator. Results show that the index performance of regulator can be predicted and used to improve the performance of the regulator. The numerical method can thus effectively reduce the develop time for new regulators and related products, as described in this article.

scholarly journals Effects of Multiple Planting Densities on Lignin Metabolism and Lodging Resistance of the Strip Intercropped Soybean Stem

Agronomy ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1177 ◽  
Author(s):  
Bin Cheng ◽  
Ali Raza ◽  
Li Wang ◽  
Mei Xu ◽  
Junji Lu ◽  
...  
Keyword(s):  
Resistance Index ◽  
Lignin Biosynthesis ◽  
Planting Density ◽  
Growth Stages ◽  
Regulation Mechanism ◽  
Key Factors ◽  
Lodging Resistance ◽  
Factors Affecting ◽  
System A ◽  
Lignin Metabolism

The shading of maize and self-shading are the key factors affecting the stem lignin biosynthesis and lodging resistance of soybean at middle and later growth stages in the strip intercropping system. A study was designed to explore the regulation mechanism of lignin metabolism and different planting densities; PD1, PD2, and PD3 were used having a total number of 17 plants m−2, 20 plants m−2, and 25 plants m−2, respectively, on the lodging resistance of strip intercropped soybean stem. Our results depicted that the lower planting density (PD1) appropriately promoted the leaf photosynthesis activities (Pn), increase the activity of lignin-related enzymes and the accumulation of carbohydrates in stems, and eventually enhanced the lodging resistance of the strip intercropped soybean stem. Correlation analysis also showed that the lodging resistance index of soybean stem was significantly correlated with the available light for soybean canopy and Pn strip intercropped soybean stem characteristics and activities of enzymes related to lignin synthesis among the different planting densities. The findings of our research will be useful in future studies to understand the relationship between different light environment, planting densities, and lodging resistance of intercropped soybean and also guide the optimum planting density in maize–soybean intercropping system.

Speech Therapy Services in a Large School System: A Six-Year Overview

1976 ◽  
Vol 7 (4) ◽  
pp. 207-219 ◽  
Author(s):  
Constance P. DesRoches
Keyword(s):  
School System ◽  
Speech Therapy ◽  
Factors Affecting ◽  
Case Load ◽  
Number Of Children ◽  
School Population ◽  
System A ◽  
Therapy Services ◽  
And Shifts ◽  
Selection Factors

A statistical review provides analysis of four years of speech therapy services of a suburban school system which can be used for comparison with other school system programs. Included are data on the percentages of the school population enrolled in therapy, the categories of disabilities and the number of children in each category, the sex and grade-level distribution of those in therapy, and shifts in case-load selection. Factors affecting changes in case-load profiles are identified and discussed.

Sign in / Sign up

Export Citation Format

Share Document