A long-term static monitoring experiment on R.C. beams: damage identification under environmental effect

2013 ◽  
Vol 10 (7) ◽  
pp. 911-920 ◽  
Author(s):  
Andrea del Grosso ◽  
Francesca Lanata
Keyword(s):  
Environmental Effect ◽  
Damage Identification ◽  
Static Monitoring

scholarly journals Modelling flood reservoir integrated with pumped hydropower storage for electricity production using HOMER

2018 ◽  
Vol 225 ◽  
pp. 05021
Author(s):  
Aishah Safi ◽  
Shahrani Anuar ◽  
Daing Mohd Nafiz ◽  
Firdaus Basrawi ◽  
Mohd Nazani ◽  
...  
Keyword(s):  
Environmental Effect ◽  
Model System ◽  
Hybrid Optimization ◽  
Electricity Production ◽  
Lower Reservoir ◽  
Cost Of Energy ◽  
High Emission ◽  
Hybrid Optimization Model ◽  
Water Catchment

This paper presented the potential of flood reservoir integrated with pumped hydropower storage for electricity production in Pekan, Malaysia. Based on the procedure in T echnical Release 55 (T R- 55), the volume of the reservoir to attenuat e flood was 5.2 million3. The volume estimated will be the size of the lower reservoir of proposed PHS and act as flood water catchment during flood seasons. The system proposed an integration of PHS with wind turbines and connect it to the grid. The Hybrid Optimization Model for Electric Renewable (HOMER) software was used to model system for electricity production. The software has simulated 200 different configurations of systems which included the diesel-only system and hybrid wind/diesel system. The standalone diesel system could produce about 25,041,824 kWh of electricity per year and emits 30,030,457 kg/year of pollutants into the atmosphere. Meanwhile, the hybrid wind/diesel could produce 25,668,980 kWh/year of electricity and emits 29,293,174 kg/year of total pollutants into the air. Although, the standalone diesel has the lowest cost of energy among all configurations which is RM 0.852/kWh, but it releases the most amount of carbon dioxide. The high emission of this gasses can have many environmental effect s in a long term.

Performance Stability of Recycle Amine-Free Water-Soluble Coolant in Long Term Operation

2014 ◽  
Vol 625 ◽  
pp. 530-535
Author(s):  
Kenji Yamaguchi ◽  
Yasuo Kondo ◽  
Satoshi Sakamoto ◽  
Mitsugu Yamaguchi ◽  
Ryoichi Nakazawa
Keyword(s):  
Environmental Effect ◽  
Free Water ◽  
Water Soluble ◽  
Water Recovery ◽  
Machining Processes ◽  
Cooling Performance ◽  
Recycling System ◽  
Term Operation ◽  
The Stability

Recently, the concern for the environment has been increasing rapidly. In machining processes, the treatment of water-soluble coolants waste has caused environmental problems. Water-soluble coolants contain surfactants, preservatives, and corrosion inhibitors for maintaining the stability and performance of the coolants. To reduce the management cost and environmental effect of water-soluble coolants, the authors have been studying a recycling system for water-soluble coolants. In the recycling system, oil-free recycle water is isolated from the coolant waste and reused as a diluent of the new coolant. The authors have been developing different types of water recovery methods for the recycling system, and the recovered water from the coolant waste has potential as a diluent for a new coolant. In this report, we focused on the amine (alkanolamine) -free water-soluble coolant. Some amine-free water-soluble coolants have been developed and are commercially available. A reduction in the environmental effect in the waste treatment of coolants is expected with amine-free coolants. We have demonstrated that the amine-free water-soluble coolant has equal or better cooling and lubricating performance compared with the conventional amine-containing coolant. In addition, the amine-free coolant shows good recyclability for the recycling system. The processing time of the recycling treatment of the amine-free coolant has been decreased by half with our recycling process compared with the conventional amine-containing coolant. In this report, we examined the stability, cooling performance and lubricating performance of the recycle amine-free water-soluble coolant in long term operation. The recycle amine-free water-soluble coolant is operated in a 3-axis machining center for several months. We observed concentration, pH, corrosion inhibition performance, cooling performance, and lubricating performance of the coolant. The results from these experiments show the amine-free water-soluble coolant has the advantage to use in the recycling system for water-soluble coolant.

scholarly journals Damage Identification of Continuous Rigid Frame Concrete Bridge

2014 ◽  
Vol 8 (1) ◽  
pp. 193-200
Author(s):  
Shengnan Huang ◽  
Lieping Ye ◽  
Xinzheng Lu
Keyword(s):  
Damage Accumulation ◽  
Damage Identification ◽  
Concrete Bridge ◽  
Element Analysis ◽  
Fea Model ◽  
Rigid Frame ◽  
The Finite Element Analysis ◽  
Mode Method ◽  
Different Levels

During a bridge service life, many factors can cause damage accumulation such as overloaded traffic, fatigue effect, and so on. Hence, the identification of potential damages has been received wide attention to prevent such sudden fatal accident. An experiment of a continuous rigid frame concrete bridge, which had 3 spans and a total length of 18 meters, was presented in this paper. Two load stages and ten different load steps were simulated to test various scenario of long-term loading and different levels of overload. Curvature mode method was adopted to detect the damage during the exercises. The changes of curvature modes were used to detect damage after the ten load steps. This method performed excellent to identify the damage position of the bridge. So, it is concluded that the curvature modes can be used to detect damage in actual structures. In addition, the Finite-Element Analysis (FEA) was utilized, and the experimental recurring was verified positively through FEA model.

scholarly journals Pb in halide perovskites for photovoltaics: reasons for optimism

2021 ◽  
Author(s):  
Arindam Mallick ◽  
Iris Visoly-Fisher
Keyword(s):  
Solar Cells ◽  
Environmental Effect ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Industrial Processing ◽  
Term Stability ◽  
Long Term Stability ◽  
Halide Perovskites ◽  
Conversion Efficiencies

Following the achievement of impressive power conversion efficiencies of perovskite solar cells (PSCs), the current challenges of this technology include long-term stability, upscaling for industrial processing, and its environmental effect....

Testing Predictions of Marine Fish and Shellfish Landings from Environmental Variables

1987 ◽  
Vol 44 (9) ◽  
pp. 1568-1573 ◽  
Author(s):  
K. F. Drinkwater ◽  
R. A. Myers
Keyword(s):  
Environmental Variables ◽  
Environmental Effect ◽  
Degrees Of Freedom ◽  
Gulf Of Maine ◽  
Fishing Effort ◽  
Fish Stocks ◽  
Environmental Models ◽  
The Mean ◽  
Fish And Shellfish

Previous studies by Sutcliffe and co-workers using exploratory analysis found correlations between environmental variables and lagged annual catch for several Gulf of St. Lawrence and Gulf of Maine fish and shellfish stocks. The present study tests these relationships using recent data. For 6 of the 13 stocks investigated, correlations between the 9–14 yr of new catch data and that predicted from the environmental models remained high (r > 0.5) and of the same sign; however, individually none was statistically significant (p > 0.05) after accounting for the loss of degrees of freedom due to the high autocorrelation in the data. The hypothesis of an overall environmental effect on the landings was considered. It could not be substantiated as the correlation coefficient for 5 of the 13 stocks reversed sign using the new data, but changes in fishing effort are believed to mask detection of environmentally induced variability in the landings of many stocks. The utility of environmentally based predictions was also tested. Overall, the mean deviations of the predicted catch based on environmental regressions were similar to predictions based on the long-term means but were higher than predictions using lagged catch. Environmentally based predictions of landings for invertebrate stocks were generally more accurate than those for fish stocks.

Geologic Environment Investigation of Underground Engineer in Chongqing

2014 ◽  
Vol 501-504 ◽  
pp. 1657-1661
Author(s):  
Le Yang ◽  
Hai You Peng ◽  
Bo Hu ◽  
Xiu Wen Ren ◽  
Xiao Tong Xie ◽  
...  
Keyword(s):  
Social Science ◽  
Environmental Effect ◽  
Environmental Problems ◽  
Underground Engineering ◽  
Real Situation ◽  
Counter Measures ◽  
Push Forward ◽  
Set Up ◽  
Main City

Based on many inquiries, analyses and researches, alternate measures of science and social science are taken in this paper, considering series of geo-environmental effect, and the harmfulness of geological effects in Chongqing main city are analysed. The basic counter measures and managing measures are suggested to treat geo-environmental problems in Chongqing main city so that a long-term plan of city-developing and the objective of a struggle based on real situation are set up. The analytic results are helpful to solve the serious geo-environmental effects, and push forward the study of urban geo-environmental problems of underground engineering in Chongqing.

The research of soft yoke single point mooring tower system damage identification based on long-term monitoring data

2018 ◽  
Vol 76 ◽  
pp. 139-147 ◽  
Author(s):  
Da Tang ◽  
Xianpeng Zeng ◽  
Deyu Wang ◽  
Wenhua Wu ◽  
Yanlin Wang ◽  
...  
Keyword(s):  
Damage Identification ◽  
Single Point ◽  
Monitoring Data ◽  
Long Term Monitoring ◽  
Term Monitoring ◽  
Tower System
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