AN ELEMENTARY THEORY OF THE PENETRATION OF A STRIKER INTO SOLID SOIL MEDIA WITH A SINGLE IMPACT, TAKING INTO ACCOUNT THE EMERGING CRACKS

2021 ◽  
pp. 25-33
Author(s):  
V.A. KORONATOV ◽  
Keyword(s):  
Elementary Theory ◽  
Single Impact ◽  
Soil Media ◽  
Solid Soil

Detection of Subsurface Voids in Soil Media Using Seismic Wave Methods

2016 ◽  
Vol 3 (1) ◽  
pp. 1-16
Author(s):  
J. Laman ◽  
◽  
A. Srivastava ◽  
A. Schokker
Keyword(s):  
Seismic Wave ◽  
Soil Media ◽  
Wave Methods

The Application of Organic Plant Media Composition on Indian Mustard Crops (Brassica Juncea L) in Polybag

2019 ◽  
Vol 1 (1) ◽  
pp. 16-22
Author(s):  
Nora Augustien ◽  
Pawana Nur Indah ◽  
Purnawati Arika ◽  
Irsyad Irsyad ◽  
Hadi Suhardjono
Keyword(s):  
Urban Communities ◽  
Urban Areas ◽  
Indian Mustard ◽  
Vegetable Crops ◽  
Sustainable Food ◽  
Mustard Plant ◽  
Soil Media ◽  
Wet Weight ◽  
Number Of Leaves ◽  
The Right

Indian mustard plants are the main vegetable crops consumed by urban communities. The need for this vegetable increases along with the increase in culinary tourism in each region and the government's appeal on sustainable food home. One effort made to meet the needs of vegetable mustard in urban areas can be cultivated using polybags. The main problem of vegetable cultivation on polybags is the availability of soil media. To overcome the limitations of soil media it is attempted to substitute it with organic litter enriched with MOL (local microorganisms). The purpose of research is to find the right combination of planting media for mustard plants. The results showed that the composition of K7 = soil: compost: litter of hay: litter of maize (2: 1: 1: 1) best on plant length, number of leaves, length of root leaves and number of roots while the wet weight of mustard plant (g) K7 = soil: compost: litter of maize: litter of corn (2: 1: 1: 1) and K8 = soil: compost: litter of maize: litter of maize: cocopeat (2: 1: 1: 1: 1) or soil: compost + urea. Increased weights of wet mustard by 63% compared to soil media and 20% compared to soil composition: compost + urea. Organic straw in the form of straw: litter of corn stalk: cocopeat enriched with MOL are able to become ready-made planting media on the cultivation of indian mustard plants in polybags.

A method for evaluating the edge strength of soil-cutting parts of forestry machines

2020 ◽  
Vol 67 (1) ◽  
pp. 111-115
Author(s):  
Sergey A. Voynash ◽  
Viktoriya A. Sokolova ◽  
Viktor I. Kretinin ◽  
Viktor A. Markov ◽  
Elena A. Alekseeva Alekseeva ◽  
...  
Keyword(s):  
Fatigue Failure ◽  
Research Purpose ◽  
Solid Inclusion ◽  
Hard Alloys ◽  
Blade Edge ◽  
Solid Soil ◽  
Soil Cutting ◽  
Cyclic Impact ◽  
Working Bodies ◽  
Reinforcing Layer

One of the main factors that determine the resistance of blade working bodies against damage under dynamic loads is their resistance to plastic crumpling, brittle or fatigue failure. Hard alloys that strengthen the blades of tillage parts are more brittle materials than steel, so the blunting of their edges is caused by the formation of cracks, their gradual growth or microchipping, even from a possible single impact of a solid inclusion in the soil. In addition to the usual brittle fracture of hard alloys, fatigue failure occurs under cyclic impact conditions. (Research purpose) The research purpose is in identifying the pattern of destruction of the blade edge of soil-cutting parts of forestry machines and theoretically justifying the algorithm for assessing the strength to determine the rational thickness of the wear-resistant coating during hardening. (Materials and methods) The article presents the main regularities of the influence of material properties and geometric parameters of the blade on the radius of rounding. (Results and discussion) The process of breaking the edge of the blade of hardened working bodies of forestry machines has been studied. The claim that the blunting of the blades is mainly due to its destruction and not to wear has been proved. The article presents a method for evaluating the strength of bimetallic blades of soil-cutting parts of forestry machines. It was found that the blunting of the blade occurs as a result of edge destruction in the process of multiple impacts of solid soil inclusions along the edge of the blade. (Conclusions) The article shows that the destruction of the edge of the blade leads to blunting of soil-cutting parts, which affects their performance. It was found that the sharpness of a self-sharpening hardened blade is determined by the thickness of the reinforcing layer and its ability to resist destruction under impact.

Modeling the effect of skidded timber bunches on forest soil compaction

2020 ◽  
pp. 154851292097870
Author(s):  
Igor Grigorev ◽  
Olga Kunickaya ◽  
Albert Burgonutdinov ◽  
Olga Burmistrova ◽  
Varvara Druzyanova ◽  
...  
Keyword(s):  
Calculated Data ◽  
Forest Products ◽  
Permafrost Soil ◽  
Negative Consequences ◽  
Limit Values ◽  
Cryolithic Zone ◽  
Tree Length ◽  
Solid Soil ◽  
Increasing Demand ◽  
Compaction Processes

An increasing demand for forest products incites a large number of log transportation operations, which may lead to negative consequences for the soil and the ecosystem as a whole. This paper presents a mathematical model to estimate the soil deformation and compaction processes under the influence of individual components of the skidding system, such as the forwarder, limbs, butts, and tops of tree-lengths in high latitudes, permafrost soil, and forests of the cryolithic zone. The effectiveness of the proposed model was evaluated according to experimental results. Comparative analysis showed that the calculated data differ from the experimental data by no more than 10%. The deformation of the soil by the bunch of tree-length logs occurs due to shearing processes. It has been established that the initial vertical stress exceeds the radial stress by 30–40%. The result of estimating the dependency of the shelterbelt width on the number of tree-length logs showed that the limit values for logs amount to 4–6 units for the mild, medium, and solid soil categories. The obtained results and the developed model will allow for a qualitative and quantitative assessment of the technological impact on the soil during the projecting of maps for logging operations.

Engineering Electrostatic Repulsion of Metal Nanoparticles for Reduced Adsorption in Single-Impact Electrochemical Recordings

2021 ◽  
Author(s):  
Lennart J. K. Weiß ◽  
Emir Music ◽  
Philipp Rinklin ◽  
Lea Straumann ◽  
Leroy Grob ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Electrostatic Repulsion ◽  
Single Impact

Elementary theory of abelian groups without torsion, with a predicate selecting a subgroup

1969 ◽  
Vol 8 (3) ◽  
pp. 182-190 ◽  
Author(s):  
G. T. Kozlov ◽  
A. I. Kokorin
Keyword(s):  
Abelian Groups ◽  
Elementary Theory
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