Complementary techniques to assess physical properties of a fine soil irrigated with saline water

2011 ◽  
Vol 66 (7) ◽  
pp. 1797-1807 ◽  
Author(s):  
Angelo Basile ◽  
Gabriele Buttafuoco ◽  
Giacomo Mele ◽  
Anna Tedeschi
Keyword(s):  
Physical Properties ◽  
Saline Water ◽  
Fine Soil ◽  
Complementary Techniques

A study on passive solar still with nanoparticles

2020 ◽  
pp. 26-38
Author(s):  
Vikas Kumar Thakur ◽  
Manoj Kumar Gaur
Keyword(s):  
Heat Transfer ◽  
Physical Properties ◽  
Saline Water ◽  
Solar Still ◽  
Passive Solar Still ◽  
Basin Water ◽  
Passive Solar ◽  
Transfer Properties ◽  
Thermo Physical Properties

In current paper shows the progressive effects of nanoparticles on the passive solar stills. Nanoparticles are used in SS because of their good thermo-physical properties, which affected the performance and efficiency of the SS, its increase the heat transfer properties of the basin water. Passive SS has very low productivity about 2-3 liters/m2 in a day. Many modifications have been done continuously by the researchers to increase the performance, productivity and efficiency of passive SSs. Various thermal storage materials are used in passive solar stills, such as wax (PCM), charcoal, fine stones and nanoparticles, to increase the productivity and also various methods is used like- by controlling the saline water depth, by controlling the glass angle and good quality of insulation for cover the still walls. The behavior of nanoparticles on the performance of passive SS has been studied and also study about the thermo-physical properties of the mixture of water and nanoparticles in present paper. Definitely, nanoparticles showed suitable characteristics and a favorable big applicability, based on improvement of thermal conductivity in comparison to base fluids free from additional metal or metal oxide nano scaled particles.

scholarly journals Formation of synthetic structures and textures of rocks when simulating in COMSOL Multiphysics

2021 ◽  
Vol 6 (2) ◽  
pp. 65-72
Author(s):  
A. S. Voznesensky ◽  
L. K. Kidima-Mbombi
Keyword(s):  
Physical Properties ◽  
Electrical Resistance ◽  
Numerical Experiments ◽  
Rock Specimen ◽  
Current Flow ◽  
Saline Water ◽  
Fem Simulation ◽  
Physical Nature ◽  
Comsol Multiphysics ◽  
Cement Matrix

Rock texture and structure play an important role in the formation of the rock physical properties, and also carry information about their genesis. The paper deals with the simulation of geometric shapes of various structures and textures of rocks by the finite-element method (FEM). It is carried out by programmed detailing of the element properties and their spatial location in the simulated object. When programming structures, it is also possible to set the physical properties of various parts of the model, grids, initial and boundary conditions, which can be changed in accordance with the scenarios for numerical experiments. In this study, on the basis of FEM, simulation of various structures and textures of rocks with inclusions and disruptions was implemented in COMSOL Multiphysics in conjunction with Matlab. Such structures are used to conduct computer generated simulations to determine physical properties of geomaterials and study the effect on them of agents of various physical nature. The building of several models was considered: a rock specimen with inclusions in the form of ellipses of equal dimensions with different orientations; a sandstone specimen containing inclusions with high modulus of elasticity in cement matrix when deforming; a limestone specimen with fractures filled with oil and saline water when determining its specific electrical resistance. As an example of a fractured structure analysis, the influence of the filler on the electrical resistance of the limestone specimen containing a system of thin elliptical predominantly horizontal fractures was considered. The change in the lines of current flow at different ratios between the matrix and the fracture filler conductivities and their effect on the effective (averaged) conductivity of the rock specimen was clearly demonstrated. The lower conductivity of the fracture filler leads to increasing the length and decreasing the cross-section of the current flow lines that, in turn, leads to significant decrease in the conductivity of the fractured rock specimen. The higher filler conductivity results in a slight increase in the conductivity of the fractured specimen compared to that of the homogeneous isotropic specimen. The resulting structures can be used for numerical experiments to study physical properties of rocks.

Assessing the impact of irrigating with saline water on physical properties of a sandy loam soil.

2021 ◽  
Author(s):  
Tinashe Mawodza ◽  
Manoj Menon ◽  
Masoud Babaei ◽  
Genoveva Burca ◽  
Oxana V. Magdysyuk
Keyword(s):  
Physical Properties ◽  
Sandy Loam ◽  
Saline Water ◽  
Aggregate Stability ◽  
Ct Scanning ◽  
Sandy Loam Soil ◽  
Irrigation Period ◽  
The World ◽  
Loam Soil ◽  
The Impact

<p>Soil salinisation is one of the most potent forms of land degradation that affects soils of arid and semi-arid regions of the world. Management of soils with potential for salinisation is key to ensuring the sustainability of marginal soils in predominantly dry regions of the world. In this research, to assess the potential impact of irrigation with saline water on the physical properties of a marginal soil. We subjected a sandy loam soil to flood irrigation with water of variable salinity levels (namely 0, 2,  5 and 10 g/L NaCl) for up to 40 days. After every irrigation cycle, each of the soil samples was subjected hydraulic conductivity measurements for the duration of the experiment. At the end of the 40 day experimental irrigation period, soil cores were non-invasively scanned using X-Ray CT scanning to assess for changes in pore distribution as a result of the different irrigation quality water. Furthermore, measurement of other physio-chemical soil properties such as aggregate stability, EC and pH of each soil were also done to get a more complete idea of the changes that occurred during the experiment. </p>

The Photometric Properties of the Ap Stars

1976 ◽  
Vol 32 ◽  
pp. 365-377 ◽  
Author(s):  
B. Hauck
Keyword(s):  
Physical Properties ◽  
Ap Stars

The Ap stars are numerous - the photometric systems tool It would be very tedious to review in detail all that which is in the literature concerning the photometry of the Ap stars. In my opinion it is necessary to examine the problem of the photometric properties of the Ap stars by considering first of all the possibility of deriving some physical properties for the Ap stars, or of detecting new ones. My talk today is prepared in this spirit. The classification by means of photoelectric photometric systems is at the present time very well established for many systems, such as UBV, uvbyβ, Vilnius, Geneva and DDO systems. Details and methods of classification can be found in Golay (1974) or in the proceedings of the Albany Colloquium edited by Philip and Hayes (1975).

The Infection of Cells by Bullet-Shaped Viruses

1969 ◽  
Vol 27 ◽  
pp. 372-373
Author(s):  
Frederick A. Murphy ◽  
Alyne K. Harrison ◽  
Sylvia G. Whitfield
Keyword(s):  
Electron Microscopy ◽  
Physical Properties ◽  
Host Cell ◽  
Thin Section ◽  
Cultured Cells ◽  
Cell Infection ◽  
Thin Section Electron Microscopy ◽  
Section Electron ◽  
Section Electron Microscopy

The bullet-shaped viruses are currently classified together on the basis of similarities in virion morphology and physical properties. Biologically and ecologically the member viruses are extremely diverse. In searching for further bases for making comparisons of these agents, the nature of host cell infection, both in vivo and in cultured cells, has been explored by thin-section electron microscopy.

Transmission electron microscopy of composite materials

1988 ◽  
Vol 46 ◽  
pp. 1012-1015
Author(s):  
K.P.D. Lagerlof
Keyword(s):  
Composite Materials ◽  
Physical Properties ◽  
Structural Defects ◽  
Structural Composites ◽  
Multiphase Materials ◽  
Structural Reinforcement ◽  
Transmission Electron ◽  
Reinforced Fiber ◽  
Particulate Reinforced Composites ◽  
Definition Of

Although most materials contain more than one phase, and thus are multiphase materials, the definition of composite materials is commonly used to describe those materials containing more than one phase deliberately added to obtain certain desired physical properties. Composite materials are often classified according to their application, i.e. structural composites and electronic composites, but may also be classified according to the type of compounds making up the composite, i.e. metal/ceramic, ceramic/ceramie and metal/semiconductor composites. For structural composites it is also common to refer to the type of structural reinforcement; whisker-reinforced, fiber-reinforced, or particulate reinforced composites [1-4].For all types of composite materials, it is of fundamental importance to understand the relationship between the microstructure and the observed physical properties, and it is therefore vital to properly characterize the microstructure. The interfaces separating the different phases comprising the composite are of particular interest to understand. In structural composites the interface is often the weakest part, where fracture will nucleate, and in electronic composites structural defects at or near the interface will affect the critical electronic properties.

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