scholarly journals Kondisi Fisika-Kimia Perairan Pulau Kabaena Kabupaten Bombana Sulawesi Tenggara

2017 ◽  
Vol 4 (1) ◽  
pp. 29
Author(s):  
Roni Wardi ◽  
Musrifin Ghalib ◽  
Mubarak Mubarak
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Oxygen Concentration ◽  
Dissolved Oxygen Concentration ◽  
Chemical Parameters ◽  
Average Value ◽  
Physical Chemical ◽  
Chemical Conditions ◽  
Depth Water

This research was conducted in December 2016 at Kabaena Island, Bombana Southeast Sulawesi which refers to data taken in August 2016. The aim the research is to provide an overview and information on the physical-chemical conditions of Kabaena waters. The method used in this study is a survey and determining the point of sampling by purposive sampling. Sampling physical-chemical parameters of waters us done at a distance of 500 meters from the beach towards the sea and the sample was measured in situ. Physical-chemical parameters were observed i.e. depth, brightness, turbidity, dissolved oxygen, salinity, acidity (pH), temperature, and flow. The results of show that physical-chemical parameters measured were 3-41 meters depth, water temperature ranged from 27oC – 32oC, salinity obtained in waters between 31‰ - 34‰, brightness values waters between 3 meters to 13 meters, the value of the degree of acidity 8, 24, dissolved oxygen concentration from 3.81 to 4.43 mg/l or 5.44 to 6.33 mg/l, turbidity levels are high at 0.97 NTU, and the velocity of 0.04 m/sec to 0, 62 m/sec with an average value of 0.19 m/sec. 3.2. Based on the research results physical-chemical parameters of the waters of Kabaena by comparison with Kepmen LH 2004, the condition of physical-chemical parameters of waters Kabaena still quite good to support the continuity of the life of the organism.

scholarly journals Nest-site selection in a fish species with paternal care

Hydrobiologia ◽  
2020 ◽  
Author(s):  
Theo C. M. Bakker ◽  
Beat Mundwiler
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Oxygen Concentration ◽  
Fish Species ◽  
Nest Site ◽  
Paternal Care ◽  
Small Fish ◽  
Dissolved Oxygen Concentration ◽  
Nest Sites ◽  
Higher Temperature

AbstractFish that perform paternal care may increase their fitness by choosing nest sites that enhance survival and development of embryos. We studied nest-site choice with respect to dissolved oxygen concentration and water temperature in males of the three-spined stickleback (Gasterosteus aculeatus), a small fish species with exclusive male parental care that usually breeds in the littoral zone of freshwaters of the Northern hemisphere. Fathers oxygenate the embryos by fanning movements of their pectoral fins. We expected choice for conditions at potential nest sites that would benefit offspring development, i.e., higher temperature and higher dissolved oxygen concentration. In the laboratory, we offered males a choice between two potential nest sites that differed in dissolved oxygen concentration or water temperature. Males preferred to build a nest at sites with a higher dissolved oxygen level or higher temperature and thus chose sites that would promote embryo development.

Hot Water Etching of Silicon Surfaces: New Insights of Mechanistic understanding and Implications to Device Fabrication

1997 ◽  
Vol 477 ◽  
Author(s):  
J. M. Rosamilia ◽  
T. Boone ◽  
J. Sapjeta ◽  
K. Raghavachari ◽  
G. S. Higashi ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Oxygen Concentration ◽  
Etch Rate ◽  
Hot Water ◽  
Surface Erosion ◽  
Rate Data ◽  
Dissolved Oxygen Concentration ◽  
Rinse Water ◽  
Water Rinsing

ABSTRACTOver the recent years, many new approaches in wafer cleaning have utilized hot water rinsing. Benefits of hot water rinsing are (1) it aids the removal of residual chemicals and (2) it improves the performance of the dry, e.g. TREBOR hydrodry. However, there have been a number of significant disadvantages documented with regard to device performance. Earlier work done at this laboratory showed that the use of DI rinse water at elevated temperatures can cause etching of the Si surface producing unwanted surface topography and microroughness. The surface erosion created under these conditions had a negative device impact which led to product yield loss. In this paper, we provide a fundamental understanding of the mechanism by which Si is etched during hot water rinsing. To this end, we have explored the interaction of dissolved oxygen concentration, water temperature, and rinse time as it relates to the attack/dissolution of H-terminated silicon. Contact angle measurements, surface roughness measurements, and etch rate data from TEM measurements as a function of water temperature, rinse time, and dissolved oxygen concentration have been made. The etch rate data strongly correlates with the rinse water temperature, however little dependence was observed with dissolved oxygen concentration. A mechanism to explain the etching will be discussed.

scholarly journals ALTERACIONES FISICO-QUIMICAS DE LA COLUMNA DE AGUA, GENERADAS POR EL USO DEL BOLICHE (METODO DE PESCA ARTESANAL) EN LA CIENAGA GRANDE DE SANTA MARTA, CARIBE COLOMBIANO

2016 ◽  
Vol 24 ◽  
Author(s):  
Mario Enrique Rueda ◽  
José Ernesto Mancera P.
Keyword(s):  
Dissolved Oxygen ◽  
Water Column ◽  
Oxygen Concentration ◽  
Coastal Lagoon ◽  
Water Transparency ◽  
Dissolved Oxygen Concentration ◽  
Artisanal Fishing ◽  
Physical Chemical ◽  
Before And After ◽  
The Impact

With the purpose of assessing the impact generated by the use of an artisanal fishing method populary called "boliche", in the tropical coastal lagoon Ciénaga Grande de Santa Marta, different aspects were quantified; being one of them designed to analyze some physical-chemical alterations of the water column, produced during the fishing operations. The dissolved oxygen concentration, water transparency and seston composition and concentration, before and after of 70 boliche's thrusts were determinated. The results showthat fishing operations generate some momentary changes of little repercution to the ecosystem, such as particle resuspention principally inorganic an increase in seston concentration and a consequen water column transparency decrease. The dissolved oxygen concentration does not show appreciable alteration.

scholarly journals Evaluation of water quality in fee-fishing ponds located in Guarapiranga’s sub basin, Upper Tietê River basin, São Paulo State

2020 ◽  
Vol 80 (2) ◽  
pp. 319-329
Author(s):  
A. S. Bueno ◽  
E. S. Rodrigues ◽  
L. S. Maruyama ◽  
P. M. G. Castro
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Mitigation Measures ◽  
Dissolved Oxygen Concentration ◽  
Awareness Campaigns ◽  
Nutrient Levels ◽  
Tietê River ◽  
Venture Management ◽  
High Nutrient

Abstract This study intended to characterize the fee-fishing ponds located in Guarapiranga's sub-basin both in terms of structure and environmental conditions. The studied region was mapped and 15 out of 24 georeferenced fee-fishing ponds had their owners interviewed through semi-structured questionnaires. In addition to that, samples were collected from the seven fee-fishing ponds closest to the reservoir throughout a seasonal cycle divided in four sample collections carried out between November 2013 and August 2014, aiming at measuring the following variables in situ: water flow rates, pH, turbidity, electrical conductivity and dissolved oxygen concentration in affluents and effluents. Other samples were taken in order to assess total phosphorus (TP) and total nitrogen (TN) concentrations. Our results show a decrease in dissolved oxygen concentration along with an increase in TP and TN concentration in effluents, as compared to affluents. TP e TN concentrations exceeded the permitted values established by CONAMA 357/2005 – Class II resolution in all effluents at least during part of the year. High nutrient levels were observed in affluents, condition with which basins that have been affected by population growth are commonly met. It was verified, by interviewing the owners regarding venture management and by analyzing the collected samples, that there is significant correlation between the daily feeding and the TP and TN levels (p=0.021 and p=0.045, respectively), with the ponds where feeding is more intense having showed the highest nutrient levels in their effluents. The results highlight the importance of mitigation measures such as educating the owners on proper water management, the installation of pond aerators in conjunction with tanks the filters of which shall be composed of aquatic macrophytes in their effluents, as well as awareness campaigns aiming to reduce the usage of dough by fishermen in order to minimize detrimental impacts on Guarapiranga’s sub-basin.

scholarly journals Problem of maintaining a normal condensate dissolved oxygen concentration

2022 ◽  
Vol 2150 (1) ◽  
pp. 012010
Author(s):  
A D Vodeniktov ◽  
N D Chichirova
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Oxygen Concentration ◽  
Normal Level ◽  
Power Plants ◽  
Cooling Water ◽  
Air Leakage ◽  
Dissolved Oxygen Concentration ◽  
Cooling Water Temperature

Abstract Study presents the results of the steam surface KCS-200-2 reconstruction. In order to maintain the dissolved oxygen concentration, according to the Code of Operation for Power Plants, the steam sparger was installed in condenser hotwell. Despite the abnormal air leakage level, reducing of dissolved oxygen concentration was reached. The dissolved oxygen concentration reduced, on average, by 2 times. As it was expected, in the cases of low inlet cooling water temperature, the final oxygen concentration did not reach the normal level. In last 3 tests the dissolved oxygen concentration was reduced to 19 mg /l. The results show a possibility of described reconstruction experience.

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