Effect of Cone Diameter on Determination of Penetration Resistance Using a FCV

2021 ◽  
Author(s):  
Mohammad Esmailzade ◽  
Abolfazl Eslami ◽  
Ali Nabizadeh ◽  
Esmail Aflaki
Keyword(s):  
Penetration Resistance

scholarly journals Penetration resistance in a latosol under different moisture and penetration speeds

Revista CERES ◽  
2013 ◽  
Vol 60 (5) ◽  
pp. 715-721 ◽  
Author(s):  
Walter Francisco Molina Jr ◽  
Sônia Maria Stefano Piedade ◽  
Juarez Rennó Amaral
Keyword(s):  
Water Content ◽  
Bulk Density ◽  
Soil Water ◽  
Soil Water Content ◽  
Penetration Resistance ◽  
Density Variation ◽  
Cone Penetration ◽  
Soil Penetration Resistance ◽  
Cone Index

The soil penetration resistance has been used to represent the compaction situation and several authors have attempted to relate the cone index (CI) with the bulk density. The importance of using the CI as source of information for decisions in agricultural activities, livestock and forestry manner, has become increasingly larger, which requires more knowledge about the penetrometers and penetrographs behavior. This study aimed to verify, in controlled laboratory conditions, the influence of soil water content and cone penetration rate to obtain the cone index, when density variation occurs. The soil was compacted by compression through a universal press cylinder which was specially designed to produce the test specimens. Bulk densities were determined from samples taken from the test specimens and their moisture content. The CI values obtained were between 0.258 and 4.776 MPa, measured in 4 moistures and 7 soil densities with 3 penetration speeds. It was concluded that the determination of IC is strongly influenced by the soil moisture but the penetration speed variation, used in this study, was not sufficient to influence the IC determination. However, the decrease in soil water content may increase the sensitiveness to detect a variation in bulk density by the use of cone index.

scholarly journals EXPERIMENTAL DETERMINATION OF THE SOIL EROSION MEASURES

1970 ◽  
Vol 65 (2) ◽  
Author(s):  
V. Herea ◽  
P. Cârdei ◽  
Raluca Sfîru
Keyword(s):  
Experimental Data ◽  
Meteorological Data ◽  
Soil Management ◽  
Penetration Resistance ◽  
Water Quantity ◽  
Soil Slope ◽  
Work Pressure ◽  
Soil Sediment ◽  
Before And After

The paper presents a mobile installation for the assessment of the slope erosion, caused by the water action, under controlled pluviometric rate. The installation can made many pluviometric phenomena (event or regular rain). The erosion assessment is made by the collect and measure of the sediment quantity. Alternately the erosion can be see by the graphics of the soil profile before and after the event. The experimental data there are: dry sediment quantity, wet surface area, delivery water quantity, the time event during, work pressure, soil slope, soil management, soil wet and penetration resistance, before and after the even. Optionally is given the meteorological data. The main result of the experiment is the soil sediment quantity by unit of area and time, which is obtained by the report sediment quantity at to wet area and at to even time. The second important result is a parameter which characterise the rain magnitude, water quantity by the area and time unit. In aim to erosion assessment, is compare the soil sediment quantity by unit of area and time with the international conventional erosion limits.Consequently result the recommendation for the anti-erosion procedure application. Supplementary, it is possible to obtain results which gives information about the soil state (wet and compaction). The installation may be used for any kind of slope zone affected by the erosion phenomena. In the agriculture domain, the procedure may be used for any kind of crop.

Contributions to Soil Resistance Mapping for Increasing Parts Durability for Agricultural Machinery

2014 ◽  
Vol 657 ◽  
pp. 534-538
Author(s):  
Sergiu Lungu ◽  
Dragoş Paraschiv ◽  
Ion Antonescu ◽  
Eugen Enculescu ◽  
Doru Bardac
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Penetration Resistance ◽  
Solid Model ◽  
Soil Resistance ◽  
Agricultural Machinery ◽  
3D Finite Element

The Paper Presents a Study Conducted by the Authors for Mapping of Soil Resistance According to Depth and Space. the Determination of Penetration Resistance Pressure of the Soil was Done in Field, with a Penetrograph, and the Experimental Data were Statistically Analyzed, in Order to Assess the Loading Regimes Faced by the Active Organs of Agricultural Machinery while Working for Soil Processing, for Estimating the Influences on their Durability. A Durability Case Study on a Real Reversible Chisel Type Cultivator Blade was also Conducted, Using a 3D Finite Element Solid Model and Two Classical 2D Models in Order to Determine its Fatigue Response, Using as Loads the Determined Soil Resistance Pressure.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

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