Hydroxyl-enhanced magnetic chitosan microbeads for boron adsorption: Parameter optimization and selectivity in saline water

2016 ◽  
Vol 109 ◽  
pp. 23-32 ◽  
Author(s):  
Akeem Adeyemi Oladipo ◽  
Mustafa Gazi
Keyword(s):  
Parameter Optimization ◽  
Saline Water ◽  
Magnetic Chitosan ◽  
Adsorption Parameter ◽  
Boron Adsorption

Limnological characteristics, community metabolism and management strategies of a coastal sinkhole in Cuba (Cenote Jennifer)

2020 ◽  
Vol 56 ◽  
pp. 24
Author(s):  
Roberto González-De Zayas ◽  
Liosban Lantigua Ponce de León ◽  
Liezel Guerra Rodríguez ◽  
Felipe Matos Pupo ◽  
Leslie Hernández-Fernández
Keyword(s):  
Hydrogen Sulfide ◽  
Primary Productivity ◽  
Major Ions ◽  
Saline Water ◽  
Management Strategies ◽  
Tourist Destination ◽  
Community Metabolism ◽  
Morphological Studies ◽  
Made In ◽  
Limnological Parameters

The Cenote Jennifer is an important and unique aquatic sinkhole in Cayo Coco (Jardines del Rey Tourist Destination) that has brackish to saline water. Two samplings were made in 1998 and 2009, and 4 metabolism community experiments in 2009. Some limnological parameters were measured in both samplings (temperature, salinity, pH, dissolved oxygen major ions, hydrogen sulfide, nutrients and others). Community metabolism was measured through incubated oxygen concentration in clear and dark oxygen bottles. Results showed that the sinkhole limnology depends on rainfall and light incidence year, with some stratification episodes, due to halocline or oxycline presence, rather than thermocline. The sinkhole water was oligotrophic (total nitrogen of 41.5 ± 22.2 μmol l−1 and total phosphorus of 0.3 ± 0.2 μmol l−1) and with low productivity (gross primary productivity of 63.0 mg C m−2 d−1). Anoxia and hypoxia were present at the bottom with higher levels of hydrogen sulfide, lower pH and restricted influence of the adjacent sea (2 km away). To protect the Cenote Jennifer, tourist exploitation should be avoided and more resources to ecological and morphological studies should be allocated, and eventually use this aquatic system only for specialized diving. For conservation purposes, illegal garbage disposal in the surrounding forest should end.

Оптимизация параметров машины для уборки лука-репки с укладкой в валок

2018 ◽  
Author(s):  
I.I. Irkov ◽  
V.G. Selivanov ◽  
N.V. Romanovskiy
Keyword(s):  
Soil Moisture ◽  
Operating Procedure ◽  
Parameter Optimization ◽  
Stable Operating

Изложены результаты оптимизации параметров машины для уборки лука-репки с укладкой в валок. Установлено, что покрытие фторопластом подкапывающих ножей, выполненных по криволинейной поверхности, и опорного катка обеспечивает стабильный технологический процесс машины при влажности почвы до 26%.The results of parameter optimization for onion harvesting machine with swath emplacement are stated. Teflon (fluoroplastic) coating of curvilinear digging shares and track roller provides stable operating procedure up to 26% soil moisture.

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