Calcium-45-Tagged Clay as Detergency Test Soil

2009 ◽  
pp. 27-27-13
Author(s):  
JW Hensley ◽  
CG Inks
Keyword(s):  
Detergency Test ◽  
Test Soil

Experimental Study on Regular Wave-Induced Scour and Settlement of a Submerged Obstacle Upon a Fluidized Sandbed

2010 ◽  
Author(s):  
Shiaw-Yih Tzang ◽  
Yung-Lung Chen ◽  
Shan-Hwei Ou
Keyword(s):  
Fluidized Beds ◽  
Suspended Sediment Concentration ◽  
Suspended Sediments ◽  
Sediment Concentration ◽  
Regular Waves ◽  
Rf Test ◽  
Total Settlement ◽  
Test Soil ◽  
Rectangular Obstacle ◽  
Wave Induced

Bed scouring and structure settlement due to interactions of regular waves and a submerged rectangular obstacle in the shallow water regions upon a fluidized fine sandy bed are experimentally investigated. Both impervious and pervious structures are installed on the test soil bed and synchronous measurements of water surface, bed surface, suspended sediment concentration and pore pressures are carried out at locations upstream and downstream. The measurements illustrate that interactions between waves and structures have relatively mild affects on the bed scouring in an unfluidized response. The interactions become more intense in the fluidized responses with significant wave decay over and increasing suspended sediments near above the fluidized beds oscillating with similar period to the loading waves. Meanwhile, the submerged structure starts to settle into the fluidized bed and significant scouring occurs. The interactions are typically greater in a RF test than in a NRF test. More than 90% of the total settlement occurs in a single event of the RF response so that the impervious and pervious structures become half buried and totally buried after the event. The settlements further affect the interactions of following loading waves and the fluidized beds. As a result, scouring on both sides of the half buried impervious obstacle is greater than those of the totally buried pervious structure.

scholarly journals Soil structure and carbon distribution in subsoil affected by vegetation restoration

2014 ◽  
Vol 60 (No. 1) ◽  
pp. 21-26 ◽  
Author(s):  
Zhao FZ ◽  
Han XH ◽  
Yang GH ◽  
Feng YZ ◽  
Ren GX
Keyword(s):  
Soil Depth ◽  
Soil Aggregate ◽  
Vegetation Restoration ◽  
Pinus Tabulaeformis ◽  
Soil Stability ◽  
Particle Size Fractions ◽  
Platycladus Orientalis ◽  
Aggregate Fractions ◽  
Test Soil ◽  
Soil Aggregate Fractions

The depth of sampling is an important factor for evaluating soil stability. The objective of this study was to test soil aggregate particle-size fractions and soil organic carbon (SOC) in water-stable aggregate by vegetation restoration through 0&ndash;60 cm soil profile. We collected soil samples in 30 years old Robinia psendoacacia (Rr); Platycladus orientalis (Po); Pinus tabulaeformis (Pt); abandoned land (Ab), and slope cropland (Sc), which were separated into &gt; 2, 2&ndash;1, 1&ndash;0.25, 0.25&ndash;0.053, and &lt; 0.053 mm fractions. The &gt; 0.25 mm water-stable aggregates (WSA) and mean weight diameter (MWD) were calculated in 0&ndash;60 cm soil depth. Results showed that soil aggregate fractions<br /> (&gt; 0.25 mm) of four vegetation types were significantly (P &lt; 0.05) higher in 40&ndash;60 cm soil depth under Po, Pt, and Ab compared with Sc and the SOC distribution in macro-aggregates (&gt; 0.25 mm) under Rr, Po, Pt, and Ab was higher more than 37.7, 92.4, 92.5, 79.1%, respectively in 40&ndash;60 cm compared with Sc additionally, &gt; 0.25 mm WSA and MWD was significantly higher in Pt soil in 20&ndash;40 cm, 40&ndash;60 cm soil depth (P &lt; 0.05). The results demonstrated that soil stability was enhanced and SOC content was increased after converting slope cropland to forest, especially under Pt forest that greatly influenced the subsoil.

Study on the Selecting Principle of Test Soil Samples in Nonlinear Seismic Response Analysis of Stratified Site

2012 ◽  
Vol 170-173 ◽  
pp. 984-993
Author(s):  
Xue Liang Chen ◽  
Meng Tan Gao ◽  
Tie Fei Li ◽  
Zhao Lun Yan
Keyword(s):  
Soil Sample ◽  
Seismic Response ◽  
Soil Layer ◽  
Soil Samples ◽  
Response Analysis ◽  
Soil Test ◽  
Calculation Error ◽  
Iron And Steel ◽  
Nonlinear Seismic Response ◽  
Test Soil

Soil dynamic nonlinear experimental results have significant impacts on the seismic response of engineering site, but how reasonable and effective to select soil samples for soil test, there is no good solution. Using detailed drilling velocity, density data, and rich soil test data of Shanxi Linfen Iron and Steel Hospital engineering site, four models are established and are analyzed for this problem. The results showed that: less than 3 meters of soil layer, each layer select one soil sample, for the thick soil layer, the rules of selecting one soil sample about every 3m thickness for the soil test, are recommended. If selecting one soil sample about every 5m~6m thickness for the thick soil layer, the calculation error is about ±10%.

A Study on the Characteristic and Properties of Riverbank Soil Samples as RBF Natural Materials from Sungai Perak, Kota Lama Kiri, Kuala Kangsar, Perak Darul Ridzuan, Malaysia

2015 ◽  
Vol 802 ◽  
pp. 634-639 ◽  
Author(s):  
Mohd Nordin Adlan ◽  
Mohamad Razip Selamat ◽  
Siti Zahirah Othman
Keyword(s):  
Hydraulic Conductivity ◽  
Pumping Test ◽  
Soil Samples ◽  
P Value ◽  
Well Production ◽  
Sieve Analyses ◽  
Test Soil ◽  
Coefficient Of Uniformity ◽  
Constant Head ◽  
The One

For a developing country such as Malaysia, riverbank/bed filtration (RBF) technology is still new and only few efforts have been made to understand the RBF mechanism and processes. Soil characteristics play important roles in determining the water quality and the ability of water to be abstracted from the wells during RBF process. A research has been carried out to identify the characteristic of riverbank soil at different layers in the pumping well (PW) borehole at Kota Lama Kiri, Kuala Kangsar, Perak, Malaysia. Soil samples were collected during the development of PW for RBF application. The maximum depth of PW was 8.50 metre. The soil samples were transported to Geotechnical Engineering Laboratory, School of Civil Engineering, Universiti Sains Malaysia and the properties were determined by a series of laboratory test. Soil particle size distribution (PSD) and hydraulic conductivity were obtained from sieve analyses and constant head test with reference to BS 1377: Part 1-9;2:1990. Laboratory results show that the value of Cu(coefficient of uniformity) for the soil samples within the borehole of PW was found to be within the range of 2.00 to 10.00 while the value of Cc(coefficient of gradation) lies in the ranges of 0.06-1.19. The One Way Analyses of Variance test was performed using Minitab statistical packages and the results indicate that the p-value was 0.996, where there was no significance difference between the mean sizes of soil samples within the PW. The hydraulic conductivity, k for PW ranges between 0.10-0.91 cm/s. Soil samples from depth 6.00-7.00 metres has the highest hydraulic conductivity, which is 0.91 cm/s. The overall well production from the pumping test was found 112.10 m3/hr.

Development of a New Outboard Engine Oil Ring Sticking and Detergency Test

1992 ◽  
Author(s):  
F. J. Blatz ◽  
J. J. Skuzinski ◽  
G. H. Keller
Keyword(s):  
Engine Oil ◽  
Detergency Test

scholarly journals Migration of mercury in the food chains of the Beloosipovo biocenosis (part 1)

2021 ◽  
pp. 324-334
Author(s):  
Alexander Prosekov
Keyword(s):  
Maximum Permissible Concentration ◽  
Negative Impact ◽  
Terrestrial Ecosystems ◽  
West Siberia ◽  
Pollution Source ◽  
Food Chains ◽  
Sampling Point ◽  
Toxic Substances ◽  
Test Soil ◽  
Main Components

Introduction. Mercury and its compounds are among the most dangerous toxic substances, which makes mercury pollution one of the most urgent environmental issues. The present research objective was to study the accumulation of mercury and its impact on the terrestrial ecosystems in the area of the Beloosipovo mercury deposit (Kemerovo Region, West Siberia, Russia). Study objects and methods. The study used standard methods to test soil, herbs, herpetobiont insects, and small mammals. The sampling was conducted at 13 points in the cardinal directions at 0.5, 1.5, and 3 km from the pollution source. The method of atomic absorption was employed to measure the concentration of mercury in the samples prepared by the wet mineralization method. Results and discussion. The main components of terrestrial ecosystems revealed no excessive concentration of mercury in the soil. However, the water samples from the Belaya Osipova river demonstrated an excess in the maximum permissible concentration of mercury from 5 to 20% (0.00056–0.00074 mg/L). Further up the food chains, the concentration of mercury in organisms decreased by 1–2 orders of magnitude, depending on the sampling point. The study also revealed Siberian trout lily (Erythronium sibiricum (Fisch. et C. A. Mey) Kryl.), which is protected at the federal and regional levels, as well as several nemoral tertiary relics. Conclusion. The decreasing concentration of mercury in the food chains means the ecosystem is under no severe negative impact.

scholarly journals Ensifer sp. CNN3 - AN INDIGENOUS BACTERIAL STRAIN WITH PLANT GROWTH PROMOTING AND ORGANOPHOSPHORUS DEGRADING PROPERTIES IN VIETNAM

2021 ◽  
Vol 59 (1) ◽  
pp. 9
Author(s):  
Chi Kim Hoang ◽  
Trần Thị Như Hằng
Keyword(s):  
Plant Growth ◽  
Bacterial Strain ◽  
Bacterial Isolate ◽  
Soil Samples ◽  
Chemical Fertilizer ◽  
Northern Vietnam ◽  
Plant Growth Promoting ◽  
Test Soil ◽  
Growth Promoting

An indigenous effective bacterial strain has been isolated from soil samples of contaminated tea farming site in Northern Vietnam with chlorpyrifos degradability and plant growth promoting characteristics. The bacterial isolate was determined to belong to genus Ensifer (syn. Sinorhizobium), and its degrading property for OPP substrate chlorpyrifos in culture as well as in test soil were studied. The results open a prospect of applying the dual-effective bacterial strain in agriculture practices either to reduce the use of chemical fertilizer or to remediate OPP contaminated planting soils.

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