scholarly journals SUPPOSITIONS OF DEVELOPMENT OF SOIL DRIFTER OF CONTINIOUS ACTION

2019 ◽  
Vol 2 (5) ◽  
pp. 66-74
Author(s):  
Igor Tichshenko
Keyword(s):  
Core Sample ◽  
Air Distribution ◽  
Soil Core ◽  
Combined Method ◽  
Elastic Valve ◽  
Pipe Line

Features of combined method of hole forming with particular compaction and excavation of soil are considered. Scheme with continuous cycle of drifting and transportation of soil core-sample at pipe line by flow of worked air is proposed. The possibility of using pneumohummer with elastic valve in system of air distribution as drive for soil drifter is studied. Behavior of change of its energetic indicators when there is backpressure at exhaust chamber is clarified.

Heavy metals speciation in soakaways sediment and evaluation of metal retention properties of surrounding soil

2007 ◽  
Vol 56 (11) ◽  
pp. 81-89 ◽  
Author(s):  
M.A. Hossain ◽  
H. Furumai ◽  
F. Nakajima ◽  
R.K. Aryal
Keyword(s):  
Heavy Metals ◽  
Surface Soil ◽  
Speciation Analysis ◽  
Core Sample ◽  
Significant Heterogeneity ◽  
Soil Core ◽  
Metal Retention ◽  
Adsorption Sites ◽  
Stormwater Infiltration ◽  
Underlying Soil

Heavy metals speciation analysis was carried out on sediment samples accumulated within soakaways in an old stormwater infiltration facility in Tokyo, Japan and on a soil core sample collected near the facility. Heavy metals content in soakaways sediments were much elevated compared to nearby surface soil with the content for Zn, Pb and Cd reaching about 5 to 10 times the content in surface soil. Speciation results revealed that significant amount of the accumulated heavy metals were present in potential mobile fractions, posing threat of release to underlying soil with changing environmental conditions. Detail analyses of soil characteristics indicated significant heterogeneity with depth, especially between the surface soil and underlying soil at site. Decrease in potential adsorption sites with depth was observed in case of underlying soil. Reduced adsorption capacity for heavy metals was evidenced for underlying soil when compared with surface soil. Furthermore, less capability of the soil organic matter to bind heavy metals was evidenced through speciation analyses, which raises concern over the long-term pollution retention potential of the underlying soil receiving infiltrated runoff.

Assessment of Available Tools for Monitoring Wheat Midge (Diptera: Cecidomyiidae)

2020 ◽  
Vol 49 (3) ◽  
pp. 627-637
Author(s):  
Amanda Jorgensen ◽  
Jennifer Otani ◽  
Maya L Evenden
Keyword(s):  
Larval Density ◽  
Triticum Aestivum L ◽  
The United States ◽  
Core Sample ◽  
Invasive Pest ◽  
Soil Core ◽  
Male Adult ◽  
Male And Female ◽  
Wheat Midge ◽  
Baited Traps

Abstract Wheat midge, Sitodiplosis mosellana Géhin, is an invasive pest of wheat, Triticum aestivum L. (Poaceae) throughout Canada and the United States. The applicability of available monitoring tools, including sex-pheromone baited traps, yellow sticky cards, and soil core sample surveys, in the northern-most agroecosystem of its invasive range has not been assessed. In this study, the attraction of male wheat midge to two Delta traps (green and orange) baited with one of three pheromone lures (a flex lure and two red septa lures from different sources) were compared. The efficacy of three yellow sticky cards (7 × 12 cm, 14 × 18 cm, and 14 × 18 cm rolled into a cylinder) for capture of male and female midge was assessed. Larvae were extracted from wheat heads sampled at the same sites to determine relationships with earlier adult trap capture. More male adult midges were captured in pheromone-baited traps with a greater surface area and in traps baited with the Scotts flex lure than the Great Lakes IPM septa lure, which had higher and more variable pheromone release rates. The smaller yellow sticky cards captured more male and female midges than the larger yellow sticky cards, regardless of shape. The number of female midges captured on yellow sticky cards predicted the number of larvae in wheat heads. The number of male midges captured in pheromone-baited traps did not predict larval density. Relationships were found between the number of overwintering cocoons recovered in soil core samples and emerging midges the following spring.

scholarly journals CALCULATUION OF DYNAMIC PARAMETERS OF REVERSE CHAMBER OF PNEUMATIC HAMMER WITH MECHANICAL LOCKING OF ELASTIC VALVE

2019 ◽  
Vol 2 (5) ◽  
pp. 98-102
Author(s):  
Alexander Chervov
Keyword(s):  
Distribution System ◽  
Cylindrical Part ◽  
Short Description ◽  
Air Pressure ◽  
Air Distribution ◽  
Pneumatic Hammer ◽  
Elastic Valve ◽  
Working Chamber ◽  
Method Of Calculation ◽  
Exhaust Line

In paper short description of construction and functioning of pneumatic hammer with air distribution system based on application of elastic valve in exhaust line of reverse chamber is carried out. Using specified parameters of pneumatic hammer (percussion energy, percussion speed, ration of chamber squares, form of working chamber, compressed air pressure and etc.) mass of striking pin, working path, diameters of working chamber and cylindrical part of reverse chamber, dimensions of circle elastic valve are calculated. Proposed method of calculation considers change of cross-section of reverse chamber when striking pin moves back. Obtained calculated values have allowed to develop diagram chart of change of air pressure in reverse chamber in dependence on time.

scholarly journals EXPERIMENTAL STUDY OF IMPACT OF PERCUSSIVE PULSE FORM ON SINKING PROCESS OF HOLLOW ROD ELEMENTS INTO SOILS

2019 ◽  
Vol 2 (5) ◽  
pp. 32-39
Author(s):  
Alexander Smolentsev ◽  
Alexander Primichkin
Keyword(s):  
Soil Condition ◽  
Core Sample ◽  
Energy Structure ◽  
Soil Core ◽  
Test Operation ◽  
Underground Utilities ◽  
Pulse Form ◽  
Soil Influence ◽  
Filling Coefficient

The work has experimental nature and it is aimed to development of vibro-percussion method of pipe-cover sinking during trenchless constructions of underground utilities. The maid idea of the research is the determination of regularities of filling inner tube hollow by soil at different forms of percussive pulse. Theoretical dependences of impact of percussion energy structure (form of percussion pulse) on efficiency of hollow rod element advance in the solid at different stages of insertion. Dimensionless parameter – filling coefficient is used for quantitative evaluation of filling rate by soil. Influence of pipe diameter on incrementation of length of soil core-sample for different percussive machines with the same percussive energy is shown. Stand and method of field test operation at various soil condition and interpretation of obtained data and its comparison with previous results obtained by the authors of the work and foreign researchers are represented.

scholarly journals CHARACTERIZATION OF PEACH ROOTS UNDER SEMIARID CONDITIONS INFLUENCED BY IRRIGATION TIMING

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1171G-1172
Author(s):  
James L. Lasswell ◽  
Josiah W. Worthington
Keyword(s):  
Sandy Loam ◽  
Irrigation Treatment ◽  
Field Studies ◽  
Core Sample ◽  
Soil Core ◽  
Significant Difference ◽  
Irrigation History ◽  
Time Of Year ◽  
Peach Trees ◽  
Small Feeder

Field studies were conducted June 2, July 27, and October 15, 1988 to determine root concentrations within the dry and wetted soil of trickle-irrigated peach trees (Redglobe variety) in Windthorst fine sandy loam soil. Two “dryland” and four irrigation treatments (based on time of year irrigation initiated and previous irrigation history) were used. A single soil core sample 2.2 cm in diameter and 80 cm deep was taken 50 cm from trickle emitters on each of 8 trees per irrigation treatment and a single sample taken the same distance from the trunk on the “dry” side of the 8 trees in each dryland treatment. Each core was sectioned into 20-cm increments, washed, roots collected, separated (small, feeder roots; large suberized roots), dried and weighed. Analyses of data for the small, feeder roots showed a significant difference (0.01 level) in root density between treatments, between sample times (each treatment), and with depth (each treatment). Root concentrations were highest in soils that had received irrigation in previous years and also when irrigation was initiated early in the year. Root concentrations were also found to be highest in the top 20 cm of soil regardless of treatment.

scholarly journals DESIGNING ANNULAR ELASTIC VALVE THAT CONTROLS AIR EXHAUST FROM WORKING CHAMBER OF PNEUMATIC IMPACT MACHINE

2021 ◽  
Vol 2 (4) ◽  
pp. 78-86
Author(s):  
Alexander Yu. Primychkin
Keyword(s):  
Distribution System ◽  
Energy Performance ◽  
Design Stage ◽  
Air Distribution ◽  
Elastic Valve ◽  
Impact Machine ◽  
Energy Characteristics ◽  
Working Chamber ◽  
Pneumatic Impact ◽  
And Control

The paper considers one of the promising shut-off and control elements of the air distribution system of pneumatic impact machines - an annular elastic valve (CUV). This element allows you to reduce the energy consumption of pneumatic devices. Unfavorable combinations of factors that hinder the movement of the valve necessary for sealing the working chamber are considered. The paper presents a method for calculating the elastic valve that controls the release of energy from the return chamber of the pneumatic impact machine, which allows determining the main geometric dimensions of the valve device at the design stage, which provides a stable self-oscillating cycle of the pneumatic impact machine with the specified energy characteristics. The developed technique was used in the modernization of the air distribution system of the ring impact machine (KUM), designed for immersion of rod elements in the ground. Tests of the resulting sample in production conditions confirmed the increase in energy performance compared to previously produced machines of a similar type.

scholarly journals COMBINED METHOD FOR CLEANING PIPES FROM SOIL CORE

2020 ◽  
Vol 2 ◽  
pp. 194-200
Author(s):  
Igor V. Tishchenko
Keyword(s):  
Optimum Level ◽  
Soil Core ◽  
Combined Method ◽  
Pneumatic Hammer ◽  
Velocity Characteristic ◽  
Core Extraction ◽  
Full Design ◽  
Soil Excavation ◽  
Lateral Friction ◽  
Pilot Tests

The paper is devoted to solving an urgent problem - improving the technology of soil excavation during trenchless pipe laying by vibro-impact pushing with the leading steel casing of the well. A new method for core extraction is proposed, which is based on the effect of its vibration transportation under the influence of combined static-dynamic load. The optimum level of soil moisture is experimentally determined, which contributes to a decrease in lateral friction when it moves along a metal pipe cavity. The results of pilot tests on cleaning a pipe 530 mm in diameter, immersed in soil at full design length of transition using Typhoon-190 pneumatic hammer with a mass of 190 kg are presented. The velocity characteristic of core displacement at changing its moisture content is obtained.

QUICK-MOUNT SOIL CORE SAMPLER FOR MEASURING BULK DENSITY

1990 ◽  
Vol 70 (1) ◽  
pp. 115-118 ◽  
Author(s):  
S. TESSIER ◽  
H. STEPPUHN
Keyword(s):  
Bulk Density ◽  
Core Sample ◽  
Soil Samples ◽  
Water Retention Curve ◽  
Soil Core ◽  
Undisturbed Soil ◽  
Retention Curve ◽  
Core Sampler ◽  
Good Measurement ◽  
Measurement Repeatability

The design for a sleeve-type, quick-mount soil core sampler for bulk density and soil water content determination and for collection of undisturbed soil samples is described and its performance discussed. This core sampler has been used to collect undisturbed soil core samples 47.5 mm in diameter and 300 mm long in tillage and seeding studies. Less than 2 min is required to retrieve, seal and store each soil core sample. The soil samples are contained in 50.8-mm-diameter aluminum liners which are easily sealed with plastic caps and stored for later laboratory analysis. This sampler resulted in very good measurement repeatability and provided subsamples suitable for water retention curve determinations. Key words: Soil sampler, coring device, bulk density, soil moisture, undisturbed cores

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