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Online since: November 2013
Authors: You Qiong Cai, Yan Lin Li, Xiao Sheng Shen, Hai Yan Zhang
Materials and Methods 2.1 Reagents All solutions were prepared with analytical-reagent grade chemicals and distilled water purified with a Milli-Q purification system with 0.22μm filter (18.2MΩ.cm, MILLIPORE, USA).
Working standard solutions were obtained daily by suitable stepwise dilution of the stock solutions with deionized water. 2.2 Instrument and ion chromatographic conditions All experiments were performed on a professional ion chromatography 850 manufactured by the Metrohm Company (Herisau, Switzerland), consisting of a 709 IC pump, 7331 IC Separation Center, a MSM Suppressor with 752 Pump unit and a 732 IC conductivity out in suppressor mode on a Metrosep Anion Dual-2 analytical column (20mm×4mm) connected in series with a Metrosep RP2 guard column (250mm×4.mm).A solution containing a mixture of 5.0mM Na2CO3 and 0.3mM NaOH flowing at a rate of 0.8mLmin-1 served as the eluent.
After approximately 1 hour, the sample solutions were diluted to constant volume 50 mL with demonized water.
Thus, the optimum volume of hydrochloric acid solution which the ration of hydrochloric acid and water was1:11 for the extraction of fluoride from Antarctic krill sample was 8mL. 3.1.3 Extraction time Fig.3.
Such high fluoride levels have been associated with the ability of krill to live in below-freezing waters [15].
Online since: May 2012
Authors: Jie Gu, Cui Ping Kuang, Yi Pan, Xu Te Zhao
In addition, compared with traditional tidal power, the in-stream tidal power does not need to construct the dams, which greatly reduces the construction period and capital investment, and the resource comes from putting free stream turbines into fast water flows (as with wind turbines) rather than from a tidal barrage [5].Therefore, it raises a great interest in in-stream tidal energy technology in many countries and regions.
Such a device is equivalent to adding a Venturi tube in the external of the horizontal axis or vertical axis impeller, which makes the flow of water through the turbine more concentrated and have higher conversion efficiency[9]
Compared to the Horizontal axis turbine or Vertical axis turbine, Oscillating Hydrofoil technology can be arranged in relatively shallow waters of the unit, and have a wider field of applications than expected [4].
Chinese in-stream tidal power device Name Power Structure Research institute Completion time Wan Xiang I 70kW Water floating vertical axis Harbin Engineering University 2002-1 Wan Xiang II 40kW Seabed fixed vertical axis Harbin Engineering University 2005-12 Underwater Windmill 5kW Zhejiang University 2006-4 Sail-winded flexible blade turbine Sail-winded flexible blade Ocean University of China 2008-12 Underwater floating horizontal axis turbine lkW Underwater floating horizontal axis Northeast Normal University 2008-12 Water floating vertical axis turbine 250kW Water floating vertical axis Harbin Engineering University, Italian Ponte di Archimede Company 2009-12 Fixed horizontal axis turbine 5kW Fixed horizontal axis Zhejiang University 2009-12 According to Dai, the development of in-stream tidal turbine can be divided into three phases.
China Renewable Energy Society of Professional Committee of Ocean Energy the first symposium proceedings, 2008: 41-46.
Online since: October 2012
Authors: Xiao Min Hu, Quang Phi Nguyen, Zhao Nan Sun
Thus, the treatment of the effluent contained these compounds is important for the protection of natural waters.
Electrochemical technique uses a direct electric source between metal electrodes immersed in polluted water.
Dye solution was prepared by dissolving the dye in distilled water.
Materials Physics and Chemistry (Professional) PhD thesis (2000)
Electrocoagulation of potable water, Water Research Vol. 18 (1984), p. 1355–1360.
Online since: June 2012
Authors: Jie Min Cheng, Yu Zhen Liu
Introduction Copper and Cadmium were two typical widespread heavy metal pollutants in natural water and soil [1, 2].
They were widely distributed in soil, sediment, aerosols, water and snow [6, 7].
The adsorption kinetics and isotherms of Cu2+ and Cd2+ on OCB were discussed and fitted by professional models.
Water, Air, & Soil Pollution, 2002, 138(7): 165 - 180
Water Research, 2008, 42:567-574
Online since: February 2020
Authors: Vu Nguyen Doan, Tung Thanh Truong, Ha Le Bao Tran
Then, fibroin fibers were rinsed three times with distilled water, dried at 600C and stored at room temperature.
FFs were obtained, washed twice with distilled water and dried at 600C.
It was insoluble in water but dissolved well in alkaline solution at high temperature.
Fibroin fiber was also insoluble in water but could be dissolved in mixture of salt/ethanol/H2O, lithium bromide [13, 19, 20].
Dale, Wound dressings, Professional nurse (London, England). 12 (1997) S12-4.
Online since: December 2012
Authors: Guang Dao Hu, Chuan Hua Zhu
Professional monitoring has been conducted, including ground surface displacement monitoring, sliding body displacement monitoring at depth, monitoring of water table, GPS monitoring and manual inspections.
The layout of the measuring points is show in Fig.1.There is 3 monitoring section line and 6 surface displacements monitoring points, those are monitoring point ZG93 and ZG118 setting in June 2003, XD1 and XD2 setting in May 2005 and XD3 and XD4 setting in October 2005.Preliminary findings from sustained monitoring was showed that Baishuihe landslide was totally get worse in stability by the impact of water storage, water table fluctuation and precipitation, which presented the deformation characteristic of retrogressive landslide with obvious sign of surface deformation and big displacement variation[4,5].
These inputs are called lagged variables and other attributes, such as precipitation ,water level and temperature that are also relevant for forecasting the series can be added in the same fashion.Fig.3 displays the whole procedure of ODM SVM regression modeling.
The deficiency of the study is that data such as temperature, precipitation and water table has not been collected completely, and the data mining process carried out only based on displacement data.
The further work is building the model considered the displacement related data such as temperature, precipitation and water table and implementing the cross prediction process, and to validate the SVM model further on accuracy and reliability.
Online since: January 2011
Authors: Ulisses Targino Bezerra, Rui Miguel Ferreira, João Paulo Castro-Gomes
The latex is an anionic water dispersion of a styrene-butadiene copolymer with an antifoam agent.
After mixing, several specimens (10 cm and 15 cm cubes; 10 cm x 20 cm cylinders) were moulded and stored in a conditioning chamber (20ºC/95 % r.h.) for a day, after which they were demoulded and stored in water at 21ºC until testing.
Constituents Concrete [kg/m3] Cement 448 Sand 840 Course aggregate 840 Water 224 w/c 0.50 Methodology The research was performed in two phases: the first refers to the assessment of mechanical properties of concrete with varying percentages of both additives, and the second the analysis of the microstructure by SEM and XRD.
The chitosan has fixed electrostaticaly the calcium from Portland cement (chelation), which implies lower mobility of water, thereby increasing the resistance of the interfacial transition zone, increasing the tensile strength and promoting the pore refinement by the elimination of excess water of hydration.
New York, McGraw-Hill Professional (2005)
Online since: February 2014
Authors: Lenka Michnová, Marcela Černíková, Barbora Hrubá
With increasing concentration of carbon dioxide the amount of water vapor increases in the atmosphere and thus the relative humidity.
Acknowledgements This paper was written by research group members of building environment as a project CZ.1.07/2.3.00 /20.0013 - “Creating an international integration of top scientific teams and increasing their professional growth on the Faculty of Civil engineering VSB-TUO“ As part of the Student grant competition - specific university research "SP2013/193 - Observation of the interior microclimate quality in low-heat consumption buildings. " Literature References [1] 2010/31/EU.
Online since: December 2012
Authors: De Zhi Yang, Xue Feng Peng, Yuan Xu
The main combustion products are carbon dioxide and water.
Taking 20MPa pressure storage tank for example, to store up 6000m3 of natural gas need to build a water volume of 30m3 high pressure container.
Natural gas must be purified before liquefied without water, carbon dioxide, benzene sulfur and other harmful substances.
The elements of LNG do not include water, which effectively avoid problem that the engine cannot start due to frost when below 0 degrees.
How to ease the constraints of petroleum resources and to solve the emission problem is an important task for continuous development of inland water transport.
Online since: August 2012
Authors: Shu Ren Yang, Peng Peng
The overall design plan of Daqing gas company pipe network information system based on the way of Web is put forward and selecting Windows 2000 Professional as client computing operating system for running the ArcInfo 9.x application program and using other geographic information system software to build the geographic information development platform that gives priority to the ArcGIS of ESRI company.
According to the characteristics of system and combined with the practical work requirements, the overall design of system should obey the following basic principles: practical applicability, the application requirements of users can be satisfied, managed and maintained easily, which becomes a powerful tool which is able to be depended on; advance is the practical guarantee in the future, so the advanced technology, methods and equipments must be used as far as possibly and improve the technique level; safety and reliability, as a large-scale and key information system application [6], which is made up of many professions and departments are involved in practicing, safety and reliability is of vital importance; open and sharing which is the prerequisite and the enough guarantee for Daqing gas company pipe network geographic information system serves other corporate information systems and other network facilities in the city (water supply and drainage, power, telecom industry and so on)
The application and development of GIS in water supply system [J].
China Water &Wastewater Journal. vol. 16 No.9 March 2000, pp. 57–62.
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