scholarly journals Feasible Ways Promoting Nitrate Removal in Riparian Zone Downstream of a Regulated River

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 2054
Author(s):  
Dongsheng Liu ◽  
Bei Zhu ◽  
Haoyu Zhu ◽  
Jian Zhao
Keyword(s):  
Ecological Restoration ◽  
Riparian Zone ◽  
Nitrate Removal ◽  
Reaction Model ◽  
Regulated River ◽  
Hyporheic Exchange ◽  
Fixed Degree ◽  
Chemical Methods ◽  
Physical Methods ◽  
Contaminated Area

Set in the downstream riparian zone of Xin’an River Dam, this paper established a 2D transversal coupling flow and solute transport and reaction model by verification within situ groundwater level and temperature. The denitrifying methods and principles in the riparian zone from the perspective of hyporheic exchange were explored, which provided a basis for the engineering techniques for river ecological restoration. Our studies have shown that under the condition of water level fluctuation, a biological method such as adding denitrifying bacteria biomass to a fixed degree (the same below) can greatly increase the denitrifying rate (1.52 g/d) in the riparian zone; chemical methods such as adding organic carbon into the surface water or groundwater can increase the total riparian nitrate removal (8.00–8.18 g) and its efficiency (19.5–20.0%) to a great extent; hydrogeological methods such as silt cleaning of the aquifer surface or local pumping around the contaminated area can increase the total riparian nitrate removal (1.06–14.8 g) to some extent, but correspondingly reduce the denitrifying efficiency (0.95–1.4%); physical methods such as designing the bank form into gentle slope or concave shape can slightly increase the total riparian nitrate removal (0.22–0.52 g) and correspondingly improve the denitrifying efficiency (0.25–0.85%). At the application level of river ecological restoration, integrated adopting the above methods can make the riparian denitrifying effect “fast and good”.

Impact of dam operations on hyporheic exchange in the riparian zone of a regulated river

2009 ◽  
Vol 23 (15) ◽  
pp. 2129-2137 ◽  
Author(s):  
Audrey Hucks Sawyer ◽  
M. Bayani Cardenas ◽  
Ashleigh Bomar ◽  
Meredith Mackey
Keyword(s):  
Riparian Zone ◽  
Regulated River ◽  
Hyporheic Exchange

scholarly journals Study on Transformation of Ginsenosides in Different Methods

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Meng-meng Zheng ◽  
Fang-xue Xu ◽  
Yu-juan Li ◽  
Xiao-zhi Xi ◽  
Xiao-wei Cui ◽  
...  
Keyword(s):  
Biological Activity ◽  
Chinese Medicine ◽  
Traditional Chinese Medicine ◽  
Pharmacological Activity ◽  
Theoretical Foundation ◽  
Major Constituent ◽  
Chemical Methods ◽  
Physical Methods ◽  
Medicinal Value

Ginseng is a traditional Chinese medicine and has the extensive pharmacological activity. Ginsenosides are the major constituent in ginseng and have the unique biological activity and medicinal value. Ginsenosides have the good effects on antitumor, anti-inflammatory, antioxidative and inhibition of the cell apoptosis. Studies have showed that the major ginsenosides could be converted into rare ginsenosides, which played a significant role in exerting pharmacological activity. However, the contents of some rare ginsenosides are very little. So it is very important to find the effective way to translate the main ginsenosides to rare ginsenosides. In order to provide the theoretical foundation for the transformation of ginsenoside in vitro, in this paper, many methods of the transformation of ginsenoside were summarized, mainly including physical methods, chemical methods, and biotransformation methods.

scholarly journals Multi-scale evaluation of ecological restoration effects in the riparian zone using Landsat series images from 1980 to 2019

2021 ◽  
Vol 132 ◽  
pp. 108342
Author(s):  
Gao Yang ◽  
Ying Li ◽  
Tieqing Huang ◽  
Bolin Fu ◽  
Jing Tang ◽  
...  
Keyword(s):  
Ecological Restoration ◽  
Riparian Zone ◽  
Scale Evaluation ◽  
Multi Scale

scholarly journals Visualization research on the influence of an ultrasonic degassing system on the operation of a hydraulic gear pump

2018 ◽  
Vol 211 ◽  
pp. 03005 ◽  
Author(s):  
Piotr Antoniak ◽  
Jarosław Stryczek ◽  
Michał Banaś ◽  
Oleksandr Lyhovskyi ◽  
Ihor Gryshko ◽  
...  
Keyword(s):  
High Speed ◽  
Theoretical Description ◽  
Working Fluid ◽  
Operating Parameters ◽  
Gear Pump ◽  
Hydraulic Systems ◽  
Chemical Methods ◽  
Physical Methods ◽  
Working Medium ◽  
Gear Pumps

Gear pumps make a group of the most popular hydraulic energy generators. Research and development works concerning those units have been going on for decades, and thanks to them gear pumps feature very good operating parameters. However, even well-designed gear pumps will not work properly if the physical properties of the working fluid are incorrect. One of such properties is compressibility of the fluid, which largely depends on the amount of gas dissolved in the medium. For this reason, the aim is to reduce the amount of gas dissolved in the working medium. It can be done using both chemical and physical methods. Because chemical methods can affect the chemical composition of the working fluid, it is the physical methods that are usually used in hydraulic systems. This paper presents preliminary visualization research into the influence of an ultrasonic degassing system on the operation of a hydraulic gear pump. Apart from that, operation of such a system and its theoretical impact on the work of the gear pump is discussed Experimental study, using a high-speed camera, was carried out in order to verify the theoretical description.

Using water temperature series and hydraulic heads to quantify hyporheic exchange in the riparian zone

2019 ◽  
Vol 27 (4) ◽  
pp. 1419-1437 ◽  
Author(s):  
Jie Ren ◽  
Wenbing Zhang ◽  
Jie Yang ◽  
Yinjun Zhou
Keyword(s):  
Water Temperature ◽  
Riparian Zone ◽  
Temperature Series ◽  
Hyporheic Exchange

Protein Detection Methods in Proteomics Research

2005 ◽  
Vol 25 (1-2) ◽  
pp. 19-32 ◽  
Author(s):  
Reiner Westermeier ◽  
Rita Marouga
Keyword(s):  
Fluorescent Dyes ◽  
Organic Dyes ◽  
Protein Detection ◽  
Detection Methods ◽  
Mass Determination ◽  
Chemical Methods ◽  
Physical Methods ◽  
Proteomics Research ◽  
Dimensional Electrophoresis

In proteomics research chemical as well as physical methods are used to detect proteins subsequently to their separation. Physical methods are mostly applied after chromatography. They are either based on spectroscopy like light absorption at certain wavelengths or mass determination of peptides and their fragments with mass spectrometry. Chemical methods are used after two-dimensional electrophoresis and employ staining with organic dyes, metal chelates, fluorescent dyes, complexing with silver, or pre-labeling with fluorophores. In some cases autoradiography is still used. Since all of these techniques are very different in terms of sensitivity, their usefulness for quantitative determinations varies significantly. This review will describe the various protein detection methods applied to electrophoresis gels.

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