Seepage Control Measures for the Papadia Dam Foundation: Design, Con-struction and Performance

2012 ◽  
Author(s):  
K. Anastasopoulos ◽  
D. A. Bruce ◽  
Ch. Oikonomidis ◽  
G. Rizopoulos
Keyword(s):  
Control Measures ◽  
Foundation Design ◽  
Dam Foundation ◽  
Seepage Control ◽  
And Performance

Characterizing the effectiveness of COVID-19 mitigation measures: A data-centric approach (Preprint)

2020 ◽  
Author(s):  
Lukman Olagoke ◽  
Ahmet E. Topcu
Keyword(s):  
Control Measure ◽  
Control Measures ◽  
World Health ◽  
Mitigation Measures ◽  
Effective Control ◽  
The World ◽  
Decision Making Processes ◽  
And Performance ◽  
Health Organization ◽  
The Impact

BACKGROUND COVID-19 represents a serious threat to both national health and economic systems. To curb this pandemic, the World Health Organization (WHO) issued a series of COVID-19 public safety guidelines. Different countries around the world initiated different measures in line with the WHO guidelines to mitigate and investigate the spread of COVID-19 in their territories. OBJECTIVE The aim of this paper is to quantitatively evaluate the effectiveness of these control measures using a data-centric approach. METHODS We begin with a simple text analysis of coronavirus-related articles and show that reports on similar outbreaks in the past strongly proposed similar control measures. This reaffirms the fact that these control measures are in order. Subsequently, we propose a simple performance statistic that quantifies general performance and performance under the different measures that were initiated. A density based clustering of based on performance statistic was carried out to group countries based on performance. RESULTS The performance statistic helps evaluate quantitatively the impact of COVID-19 control measures. Countries tend show variability in performance under different control measures. The performance statistic has negative correlation with cases of death which is a useful characteristics for COVID-19 control measure performance analysis. A web-based time-line visualization that enables comparison of performances and cases across continents and subregions is presented. CONCLUSIONS The performance metric is relevant for the analysis of the impact of COVID-19 control measures. This can help caregivers and policymakers identify effective control measures and reduce cases of death due to COVID-19. The interactive web visualizer provides easily digested and quick feedback to augment decision-making processes in the COVID-19 response measures evaluation. CLINICALTRIAL Not Applicable

scholarly journals Assessing the Efficiency of Seepage Control Measures in Earthfill Dams

2020 ◽  
Vol 38 (5) ◽  
pp. 5667-5680
Author(s):  
Ali Torabi Haghighi ◽  
Anne Tuomela ◽  
Ali Akbar Hekmatzadeh
Keyword(s):  
Control Measures ◽  
Seepage Control ◽  
Earthfill Dams

scholarly journals The Causes Analysis of the Air Preheater and Performance Blocking Evaluation of the Measures on the SCR De-NOx Unit

2019 ◽  
Vol 118 ◽  
pp. 03056
Author(s):  
Su Pan ◽  
Pengfeng Yu ◽  
Linbo Liu ◽  
Jing Han ◽  
Xiao Shen
Keyword(s):  
Flue Gas ◽  
Differential Pressure ◽  
Control Measures ◽  
Gas Temperature ◽  
Air Preheater ◽  
Environment Temperature ◽  
Ammonium Bisulfate ◽  
And Performance ◽  
Exhaust Gas Temperature ◽  
Ammonia Injection

In order to solve the problem of abnormal rise of the differential pressure of the revolving air preheater on 300MW unit, we analysed the causes of abnormal rise of the differential pressure of the air preheater and evaluated performances of control measures, through historical data mining and on-site inspection of the unit. The results show that, with the gradual decrease of environment temperature with the decrease of the exhaust gas temperature, the ashes in flue gas are bound by acid liquid produced by condensation of flue gas, and the adhesion areas of the ammonium bisulfate produced in the denitration process are enlarged. However the original set ash blowing pressure can no longer satisfy the requirements of the air preheater, giving rise to the differential pressure of the air preheater on both sides to rise. The reason of the higher differential pressure of the unilateral air preheater is that the large ammonia injection amount, leading to the increases of ammonia escape of the denitrification system. So the side of the air on preheater ammonium bisulfate type blockage is more serious. After the Measures of Adjusting distribution coefficient of ammonia supply valve on both sides, increasing the dust blowing frequency and pressure of the air preheater, the differential pressure of air preheater on both sides are close to the consistent. The decrease amplitude of the differential pressure of the air preheater on 280MW is about 300-500Pa.

Study on Deformation and Control Measures of Columnar Jointed Basalt for Baihetan Super-High Arch Dam Foundation

2017 ◽  
Vol 51 (8) ◽  
pp. 2569-2595 ◽  
Author(s):  
Qixiang Fan ◽  
Zhilin Wang ◽  
Jianrong Xu ◽  
Mengxia Zhou ◽  
Quan Jiang ◽  
...  
Keyword(s):  
Arch Dam ◽  
Control Measures ◽  
High Arch Dam ◽  
Dam Foundation ◽  
Columnar Jointed Basalt ◽  
And Control

User Participation in an Interactive Software Design

1981 ◽  
Vol 10 (2) ◽  
pp. 165-174 ◽  
Author(s):  
Sara F. Rushinek ◽  
Avi Rushinek
Keyword(s):  
Perceived Control ◽  
Learner Control ◽  
User Participation ◽  
Performance Measure ◽  
Control Measures ◽  
Computer Assisted ◽  
Interactive Software ◽  
Treatment Groups ◽  
Control Concept ◽  
And Performance

In this study an attempt was made to clarify conflicting results in the learner control literature. The learner control concept was redefined in order to include both choice and self investment variables. The combined effects of choice and self investment variables were considered in this study to be motivational variables which affect the learner's attitudes and performance on a computer assisted instructional task. The results of this investigation indicated overall differences in performance among treatment groups. An interaction effect between choice and self investment was found for the performance measure. The expected interaction and perceived control measures were not found.

Effects of pea (Pisum sativum L.) cultivars on Thrips tabaci Lindeman preference and performance

2013 ◽  
Vol 152 (6) ◽  
pp. 885-893 ◽  
Author(s):  
M. POBOŻNIAK ◽  
E. H. KOSCHIER
Keyword(s):  
Pisum Sativum ◽  
Activity Patterns ◽  
Leaf Nitrogen ◽  
Thrips Tabaci ◽  
Control Measures ◽  
Host Use ◽  
Onion Thrips ◽  
Cultivar Selection ◽  
And Performance ◽  
Thrips Population

SUMMARYThe polyphagous onion thrips Thrips tabaci Lindeman (Thysanoptera: Thripidae) is a serious pest in many protected and field crops and has recently been found to occur in high numbers in Pisum sativum L. crops. In the present study, the abundance of T. tabaci was compared on two pea cultivars in the field. Data on sweep net catches at different sampling times during the day suggest that peak activity of the thrips is at noon. Significantly more thrips larvae and adults were caught on the early pea cultivar Cud Kelwedonu compared with the very early cultivar Pionier, particularly during and after flowering of the peas. Analysis of primary plant compounds indicated that the higher leaf nitrogen and sucrose contents in the leaves of cvar Cud Kelwedonu promote thrips population growth in pea. The preference of T. tabaci for leaves of cvar Cud Kelwedonu was confirmed in experiments in the laboratory. Thrips tended to settle, caused significantly more feeding damage and laid significantly more eggs on the leaves of Cud Kelwedonu. Knowledge on abundance, activity patterns and host use of T. tabaci in pea may contribute to optimizing cultivar selection, monitoring and timing of possible control measures in the future.

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