Characterization of the water quality in the Saint Lawrence River: Determination of homogeneous zones by correspondence analysis

1979 ◽  
Vol 15 (6) ◽  
pp. 1451-1462 ◽  
Author(s):  
Marius Lachance ◽  
Bernard Bobee ◽  
Denyse Gouin
Keyword(s):  
Water Quality ◽  
Correspondence Analysis ◽  
Saint Lawrence River

scholarly journals Determination of Water Quality by Ion Characterization of Van Lake Water

2018 ◽  
Vol 7 (4) ◽  
pp. 169-179 ◽  
Author(s):  
Aybek YİĞİT ◽  
Zeynep Turhan IRAK ◽  
Dilara ÖZTÜRK ◽  
Erhan ÖZTÜRK ◽  
Duygu ALPASLAN ◽  
...  
Keyword(s):  
Water Quality ◽  
Lake Water

scholarly journals O PROCESSO DE EUTROFIZAÇÃO ARTIFICIAL NO LAGO PARANOÁ, BRASÍLIA, DF

1994 ◽  
Author(s):  
Gustavo Macedo de Mello Baptista ◽  
Mário Diniz de Araújo Neto
Keyword(s):  
Water Quality ◽  
Sewage Treatment ◽  
Federal District ◽  
High Rate ◽  
Field Methods ◽  
Influx Rate ◽  
Sewage Treatment Plants

This paper represent an academic exercise dealing with some index parameters of water quality usinganalytical field methods. In first instance it aims to demonstrate the praticalness of the methods as well asits level of precision. It was possible to estimate the influence of parameters like NO3, pH, OD (dissolvedoxygen), etc. for the determination of water quality of the Paranoá Lake wich serves as recipient of sewagefrom Brasilia and satellite towns of the Federal District/Brazil, with an estimated influx rate of 140 litersper second. Treatment of this quantity of sewage (during the time of our study) is very simple: just passingby a fence system. Conditions of eutrophication of this water body have become worse due to the inflowof clandestine sewage from houses along the the lake-side, wich contributes much to the increase ofnutrients, especially phosphorus and nitrogen.The obtained results were promising and served to stimulate further studies in the course "Practice ofField Studies", even not serving for a definite characterization of the waters. It is important to emphasizethat neither results nor the analysis of the data are focused in this paper.The high rate of eutrophication at the sampling stations can be observed using NO3 e PO4 as parameters.In that sense the following measures are recommended in order to maintain chemical and physicalcharacteristics of the habitat:1 - dredging of organic mud from the bottom of the lake, since it contains 80% of the phosphates ofthe slop, besides other nutrients;2 - expansion or construction of new sewage treatment plants in order to prevent the inflow ofsewage in natura in the lake and to satisfy the demand of the population;3 - control of clandestine sewage of the houses at Lake South and North by the official environmentalprotection agencies punishing house owners with application of heavy fines;4 - development of environmental education programs for scholars of all levels in order to arouse theconscience for preserving of water resources.

Characterization of Impressed Current Technique to Model Corrosion of Reinforcement in Concrete

2020 ◽  
Vol 11 (1) ◽  
pp. 93-99
Author(s):  
Abu Zakir Morshed ◽  
Sheikh Shakib ◽  
Tanzim Jahin
Keyword(s):  
Immersion Time ◽  
Chloride Content ◽  
Engineering Science ◽  
Coastal Regions ◽  
Faraday’S Law ◽  
Current Technique ◽  
Corrosion Cell ◽  
Impressed Current

Corrosion of reinforcement is an important durability concern for the structures exposed to coastal regions. Since corrosion of reinforcement involves long periods of time, impressed current technique is usually used to accelerate the corrosion of reinforcement in laboratories. Characterization of impressed current technique was the main focus of this research,which involved determination of optimum chloride content and minimum immersion time of specimens for which the application of Faraday’s law could be efficient. To obtain optimum chloride content, the electrolytes in the corrosion cell were prepared similar to that of concrete pore solutions. Concrete prisms of 200 mm by 200 mm by 300 mm were used to determine the minimum immersion time for saturation. It was found that the optimum chloride content was 35 gm/L and the minimum immersion time for saturation was 140 hours. Accounting the results, a modified expression based on Faraday’s law was proposed to calculate weight loss due to corrosion. Journal of Engineering Science 11(1), 2020, 93-99

The Determination of Sense via Deleuze and Blanchot: Paradoxes of the Habitual, the Immemorial, and the Eternal Return

2008 ◽  
Vol 2 (2) ◽  
pp. 155-177 ◽  
Author(s):  
Eugene Brently Young
Keyword(s):  
Eternal Return

Eternal return is the paradox that accounts for the interplay between difference and repetition, a dynamic at the heart of Deleuze's philosophy, and Blanchot's approach to this paradox, even and especially through what it elides, further illuminates it. Deleuze draws on Blanchot's characterisations of difference, forgetting, and the unlivable to depict the ‘sense’ produced via eternal return, which, for Blanchot, is where repetition implicates or ‘carries’ pure difference. However, for Deleuze, difference and the unlivable are also developed by the living repetition or ‘contraction’ of habit, which results in his distinctive characterization of ‘force’, ‘levity’, and sense in eternal return.

SEM/EDS Characterization of Uncommon Metal Whiskers and Determination of Underlying Growth Mechanisms

2018 ◽  
Author(s):  
D. Basak ◽  
L. H. Ponce
Keyword(s):  
Reliability Analysis ◽  
Case Studies ◽  
Whisker Growth ◽  
Innovation Systems ◽  
Growth Mechanisms ◽  
Crystal Oscillator ◽  
Analysis Laboratory ◽  
Investigative Techniques

Abstract Two case-studies on uncommon metals whiskers, performed at the Reliability Analysis Laboratory (RAL) of Northrop Grumman Innovation Systems, are presented. The components analyzed are an Oven Controlled Crystal Oscillator (OCXO) and an Electromechanical Relay. Investigative techniques were used to determine the chemical and physical makeup of the metal whiskers and develop an understanding of the underlying effects and mechanisms that caused the conditions conducive to whisker growth.

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