For more examples, see my article: Yet it's a vacuum there. The thing is that of course it was a sunny day for the astronauts - you tend to forget when you see the black sky. On Earth some of the light comes to the landscape from the sun and some reaches us indirectly from the blue sky and the clouds.
You will find ten articles about a variety of subjects, written by Dutch water professionals on the basis of thorough research. Repeated appeals and a personal approach have resulted in sufficient proposals for articles in order to enable the editorial board to make this selection.
The board mainly looked at a clear relation with the daily practice in the water sector. Research, results and findings must be new and produce articles which present new knowledge, insights and techniques with a view to a practical application.
This edition also offers a wide range of subjects: The publication of Water Matters is made possible by prominent players in the Dutch water sector. With the publication of Water Matters, the participating organizations wish to make new, applicable water knowledge accessible.
You can also read Water Matters in digital form at H2O-online www. This publication is also available as a digital magazine in Positive impacts of robots English language via the same website or via www.
The English publication is partly made possible by the Netherlands Water Partnership NWPthe network of approximately collaborating public and private organizations in the area of water. The articles in English can also be shared from the digital magazine at H2O-online.
Furthermore, articles from previous editions can be found on the site. We hope you enjoy reading this edition. If you have any comments, please let us know via redactie h2owaternetwerk. There is a sustainable solution, where precipitation excess during the winter period is utilized as optimally as possible by storing the water underground.
In saline groundwater environments with a large water demand, such as the Westland, greenhouse horticulture uses rainwater as its primary water source.
However, the storage capacity in aboveground reservoirs is generally insufficient for effectively collecting all the rainwater from wet periods. This brackish water extraction and concentrate disposal has the risk that the salination of the groundwater will be reinforced and is for that reason under pressure in terms of policy.
In less saline areas, underground storage of winter precipitation excess offers a sustainable alternative. The excess precipitation from greenhouse roofs is infiltrated and stored via wells in the underground.
In periods of shortage this water is recovered. This technique is known by the name of aquifer storage and recovery ASR. In saline groundwater environments, such as the Westland, this technique can be applied to a moderate extent, because due to density differences the relatively light fresh infiltration water floats upwards during storage in the brackish aquifer.
The freshwater is therefore difficult to recover unmixed. In this article, we present a concept where ASR and desalination of brackish groundwater by means of Reverse Osmosis RO have been combined.
The set-up was tested at a tomato grower in the Westland in order to research the practical applicability. As a result, the excess rainwater of a total of 27 hectare of greenhouse roofs became available.
An ASR system was built in order to be able to infiltrate the rain water into a sand layer at a depth of 23 to 37 m, where the ambient groundwater was brackish approx. The ASR system was fed with the water that would otherwise be discharged unused from the rainwater reservoirs of the horticulturalist.
There was an attempt to keep these reservoirs at a filling degree of approx. Prior to infiltration, suspended solids were removed from the water using a slow sand filter. The ASR system was designed to be able to recover a maximum of freshwater, despite upward floating and mixing.
To this end, a number of adjustments have been introduced in relation to a simple ASR system see Figure 2: Water could be infiltrated in and recovered from the aquifer at three different depths; 2.
The intercepted brackish water was returned to a deeper aquifer 50 — 90 m deep ; 3. There was the option of desalinating the recovered water again, when mixing of freshwater with brackish water had occurred from May This water was extracted by means of ASR wells in the heart of the inserted freshwater bubble: In addition, this mixed water was also extracted with the already present extraction well belonging to the desalination system of Prominent on the edge of the freshwater bubble: This involved automatically measuring groundwater recharge and extraction, as well as the salinity on the basis of electrical conductivity of the extracted water.
By means of sensors, borehole geophysics, and sampling and analysis macro-chemistry, trace elements, modified fouling index MFI of groundwater at various depths at a distance of 5, 15, 30, 40 and 60 m from the ASR wells, the distribution and the water quality development of stored water was monitored.
In addition, a detailed 3-D, density-dependent groundwater model was set up with the model code SEAWAT in order to evaluate the transport processes in the aquifer and to understand the effects on the groundwater system.Learn about some examples (both positive and negative) of social impact of robotics and the most important angles to look at the quality and risks of robotics are the business impact and social impact.
Egg-cell of a female fruit fly with the egg cell in which H3K27me3 was made visible through green staining. This cell, together with the sperm, will contribute to the formation of the next.
Positive and negative effects of technology on our lives. Essay on Impact of technology on our lives. What is positive and negative effects of technology. The humanoid robot AILA (artificial intelligence lightweight android) operates a switchboard during a demonstration by the German research centre for artificial intelligence at the CeBit computer.
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