Search results for "Loam"
showing 10 items of 76 documents
Testing laboratory methods to determine the anisotropy of saturated hydraulic conductivity in a sandy–loam soil
2009
Abstract Anisotropy, a (the log of the ratio of horizontal to vertical conductivity, log 10 ( K h / K v )), of saturated soil hydraulic conductivity, K s , affects transport processes in soil but is not routinely measured, probably because practical and validated methods are lacking. The objective of this investigation was to determine the effects of different constant-head laboratory and sampling procedures on anisotropy of saturated hydraulic conductivity measurements. The sequence of K s measurements was varied (vertical conductivity, K v , first, then horizontal, K h , second and vice versa) for an experimental set-up considering five variables: 1) water ponding type (Mariotte or siphon…
Using the simplified falling head technique to detect temporal changes in field-saturated hydraulic conductivity at the surface of a sandy loam soil
2007
Abstract Determining temporal changes in field-saturated hydraulic conductivity ( K fs ) is important for understanding and modeling hydrological phenomena at the field scale. Little is known about temporal variability of K fs values measured at permanent sampling points. In this investigation, the simplified falling head (SFH) technique was used for an approximately 2-year period to determine temporal changes in K fs at 11 permanent sampling points established at the surface of a sandy loam soil. Additional K fs measurements were obtained by the single-ring pressure infiltrometer (PI) technique to also compare the SFH and PI techniques. The lowest mean values of K fs , M ( K fs ), were det…
Testing the concentric-disk tension infiltrometer for field measurement of soil hydraulic conductivity
2010
Abstract The concentric-disk tension infiltrometer (CDTI) may be used to simultaneously measure the confined ( K c ) and the unconfined ( K u ) soil hydraulic conductivity, but it has received little testing. Comparison between K c and K u can be affected by the calculation approach applied to analyze unconfined steady-state infiltration rates. The objectives of this investigation were to: i) establish the effect of the calculation approach on the estimates of K u ; and ii) compare the K c and K u values measured by the CDTI. A clay soil, a structureless sandy loam soil, and a sandy loam soil with a relatively high gravel content were sampled using a disk of radius equal to 107.5 mm, compri…
Effect of Soil Moisture on the Angular Variation of Thermal Infrared Emissivity of Inorganic Soils
2014
Emissivity is influenced by different factors. This study deals with the effect of the soil moisture (SM) content on the zenithal (θ) variation of ratio-to-nadir emissivity (εr), for a wide variety of inorganic bare soils. To retrieve εr, a goniometer assembly was used, together with two identical CIMEL Electronique CE312-2 radiometers working at six spectral bands within 7.7-14.3 μm, performing simultaneous radiance measurements at different combinations of zenith and azimuth angles. The results showed that the effect of SM upon εr(θ) is different depending on the spectral range and textural composition of the sample. Sandy soils showed a decrease of εr(θ) from nadir up to 0.132 for θ ≥ 40…
Pauline E. Hopkins's Intertextual Aesthetics in Contending Forces
2017
Pauline E. Hopkins‘s attitude towards fiction as a terrain where political and social truths could be uttered, helped her establish a new hybrid writing paradigm in Contending Forces, her historical romance. The extraordinary intertextual load of references, verbatim borrowings and changed citations, her Emersonian ―noble borrowing,‖ is in fact both an audacious maneuvering of popular literature, and a systematic and subversive redrafting of preceding canonical texts from the Anglo-American literary traditions and of contemporary historical political testimonies. Hopkins‘s palimpsestic aesthetics recreate a sense of African American literary interventions aimed at recomposing a new black ar…
Fate of the herbicides glyphosate, glufosinate-ammonium, phenmedipham, ethofumesate and metamitron in two Finnish arable soils.
2006
The fate of five herbicides (glyphosate, glufosinate-ammonium, phenmedipham, ethofumesate and metamitron) was studied in two Finnish sugar beet fields for 26 months. Soil types were sandy loam and clay. Two different herbicide-tolerant sugar beet cultivars and three different herbicide application schedules were used. Meteorological data were collected throughout the study and soil properties were thoroughly analysed. An extensive data set of herbicide residue concentrations in soil was collected. Five different soil depths were sampled. The study was carried out using common Finnish agricultural practices and represents typical sugar beet cultivation conditions in Finland. The overall obse…
A structural insight into the P1 S1 binding mode of diaminoethylphosphonic and phosphinic acids, selective inhibitors of alanine aminopeptidases
2016
Abstract N′-substituted 1,2-diaminoethylphosphonic acids and 1,2-diaminoethylphosphinic dipeptides were explored to unveil the structural context of the unexpected selectivity of these inhibitors of M1 alanine aminopeptidases (APNs) versus M17 leucine aminopeptidase (LAP). The diaminophosphonic acids were obtained via aziridines in an improved synthetic procedure that was further expanded for the phosphinic pseudodipeptide system. The inhibitory activity, measured for three M1 and one M17 metalloaminopeptidases of different sources (bacterial, human and porcine), revealed several potent compounds (e.g., K i = 65 nM of 1u for Hs APN). Two structures of an M1 representative (APN from Neisser…
CATION EXCHANGES IN CLAY LOAM FROM BOGOR, WEST JAVA
2008
<p>Kapasitas tukar kation dan koefisien selektivitas merupakan parameter penting yang mempengaruhi distribusi kation antara fase larutan dan fase padatan, dan mobilitasnya di dalam tanah. Studi tentang pertukaran kation melalui koefisien selektivitas pada tanah clay loam Bogor, Jawa barat yang ditanami sawi (Brassica juncea) telah dilakukan. Kation-kation utama yang dipelajari adalah Ca, Mg, K dan Na. Kompleks adsorpsi di dalam tanah tersebut didominasi oleh Ca dan Mg. K dan Na sangat sedikit diadsorpsi. Koefisien selektivitas antara ion adalah K<sub>Ca,Mg</sub>,K<sub>K,Ca</sub>, K<sub>Na,Ca</sub>, K<sub>K,Mg</sub>, K<sub>Na…
Shoot accumulation of several trace elements in native plant species from contaminated soils in the Peruvian Andes
2012
Abstract Metal mining gives access to very important resources but contributes to severe and diverse environmental problems. Until recently, little has been known about the remediation of mining sites in Latin America using metallophytes. The present study was designed to identify and characterize spontaneously growing heavy metal tolerant plant species in the area around the polymetallic Carolina mine in Hualgayoc (Cajamarca, Peru). The aim was to find species that are potentially useful for phytoremediation. Plants and soils were sampled and analysed for concentrations of As, Fe, Mn, Pb, Zn and Ti. The Translocation Factor (TF) and the Bioaccumulation Factor (BF) were determined and used …
Prostituzione. Aporie e tabù di un nuovo diritto penale tutorio
2018
Molteplici sono le forme attraverso le quali la prostituzione può essere esercitata e plurimi sono i suoi modelli normativi di regolamentazione: tradizionalmente, si contendono il campo il proibizionismo, il regolamentarismo e l’abolizionismo; più di recente la c.d. decriminalizzazione e il c.d. neo-proibizionismo. In questo volume, dopo una breve disamina delle possibili forme e dei plurimi significati della prostituzione, ci si sofferma preliminarmente su alcuni ordinamenti-tipo che presentano caratteristiche peculiari ora dell’uno ora dell’altro dei modelli normativi attuabili, tenendo conto anche di recenti e significative sentenze di talune Corti supreme in ordinamenti di tipo abolizio…