scholarly journals Research on Dynamic Characteristics of River Pollution Degradation Coefficient in the Main Stream of Weihe River

2020 ◽  
Vol 1549 ◽  
pp. 022050
Author(s):  
Haiou Zhang
Keyword(s):  
Dynamic Characteristics ◽  
River Pollution ◽  
Main Stream ◽  
Weihe River ◽  
Degradation Coefficient

scholarly journals Experimental Investigation on the Relationship Between COD Degradation and Hydrodynamic Conditions in Urban Rivers

2019 ◽  
Vol 16 (18) ◽  
pp. 3447
Author(s):  
Lei Tang ◽  
Xiangdong Pan ◽  
Jingjie Feng ◽  
Xunchi Pu ◽  
Ruifeng Liang ◽  
...  
Keyword(s):  
Flow Characteristics ◽  
Oxygen Demand ◽  
Organic Pollution ◽  
River Pollution ◽  
Scientific Basis ◽  
Guizhou Province ◽  
Urban Rivers ◽  
Hydraulic Conditions ◽  
The Relationship ◽  
Degradation Coefficient

Due to extensive pollution and the relatively weak flow replacement in urban rivers, determining how to fully utilize the self-purification abilities of water bodies for water quality protection has been a complex and popular topic of research and social concern. Organic pollution is an important type of urban river pollution, and COD (chemical oxygen demand) is one of the key pollution factors. Currently, there is a lack of research on the relationship between COD degradation and the flow characteristics of urban rivers. In this paper, COD degradation experiments were conducted in an annular flume with Jinjiang River water at controlled flow velocities and the COD degradation coefficients under different hydraulic conditions were analyzed. A good correlation was observed between the degradation coefficient and hydraulic conditions. According to dimensional analysis, the relationship between the COD degradation coefficient and hydraulic conditions such as the flow velocity, water depth, Reynolds number (Re), and Froude number (Fr) was established as K COD = 86400 u h F r 0.8415 R e − 1.2719 + 0.258 . The COD degradation coefficients of the Chishui River in Guizhou Province ranged from 0.175–0.373 1/d based on this formula, and the field-measured values varied from 0.234–0.463 1/d. The error in the formula ranged from 5.4–25.3%. This study provides a scientific basis for the prediction of the COD degradation coefficients of urban rivers.

Ambulatory Activity Monitoring

2009 ◽  
Vol 14 (2) ◽  
pp. 142-152 ◽  
Author(s):  
Johannes B.J. Bussmann ◽  
Ulrich W. Ebner-Priemer ◽  
Jochen Fahrenberg
Keyword(s):  
Physical Activity ◽  
Activity Monitoring ◽  
Main Stream ◽  
Computer Algorithms ◽  
Ambulatory Activity ◽  
Physiological Variables ◽  
Piezoresistive Sensors ◽  
Self Reports ◽  
Recent Developments ◽  
Objectively Measured

Behavior is central to psychology in almost any definition. Although observable activity is a core aspect of behavior, assessment strategies have tended to focus on emotional, cognitive, or physiological responses. When physical activity is assessed, it is done so mostly with questionnaires. Converging evidence of only a moderate association between self-reports of physical activity and objectively measured physical activity does raise questions about the validity of these self-reports. Ambulatory activity monitoring, defined as the measurement strategy to assess physical activity, posture, and movement patterns continuously in everyday life, has made major advances over the last decade and has considerable potential for further application in the assessment of observable activity, a core aspect of behavior. With new piezoresistive sensors and advanced computer algorithms, the objective measurement of physical activity, posture, and movement is much more easily achieved and measurement precision has improved tremendously. With this overview, we introduce to the reader some recent developments in ambulatory activity monitoring. We will elucidate the discrepancies between objective and subjective reports of activity, outline recent methodological developments, and offer the reader a framework for developing insight into the state of the art in ambulatory activity-monitoring technology, discuss methodological aspects of time-based design and psychometric properties, and demonstrate recent applications. Although not yet main stream, ambulatory activity monitoring – especially in combination with the simultaneous assessment of emotions, mood, or physiological variables – provides a comprehensive methodology for psychology because of its suitability for explaining behavior in context.

Invited PaperTemperature dependence of SiGe HBT static and dynamic characteristics

1998 ◽  
Vol 08 (PR3) ◽  
pp. Pr3-81-Pr3-86
Author(s):  
F. Aniel ◽  
N. Zerounian ◽  
A. Gruhle ◽  
C. Mähner ◽  
G. Vernet ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Static And Dynamic Characteristics ◽  
Sige Hbt

Some Dynamic Characteristics of Binary Near-Earth Asteroids

2017 ◽  
Vol 13 (1) ◽  
pp. 30-33
Author(s):  
N.V. Ivanenko ◽  
◽  
О.A. Bazyey ◽  
Keyword(s):  
Dynamic Characteristics ◽  
Near Earth Asteroids
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