نتایج جستجو برای: eroded soils
تعداد نتایج: 51655 فیلتر نتایج به سال:
Computer simulation models are increasingly popular for predicting soil loss to quantify the processes of detachment, transport and deposition of eroded soils. To assess the effects of different management on soil erosion, selecting the best models and their validation a positive step is considered. In this research the Rangeland Hydrology and Erosion Model (RHEM) was evaluated by using soil er...
Salt marsh survival with sea-level rise (SLR) increasingly relies on soil organic carbon (SOC) accumulation and preservation. Using a novel combination of geochemical approaches, we characterized fine SOC (≤1 mm) supporting elevation maintenance. Overlaying thermal reactivity, source (δ13C), age (F14C) information demonstrates several processes contributing to development: grass production, red...
In what are now the warm deserts of American Southwest, direct effects changing climate on plant distributions typically viewed as principal driver vegetation changes that followed late Pleistocene–Holocene transition (LPH). However, at a semi-arid site in eastern Mojave Desert, to modern, shrub-dominated desert scrub xeric, south-aspect hillslopes occurred only after erosion relatively thick s...
Background—Systemic levels of myeloperoxidase predict prognosis in patients with acute coronary syndromes and are considered a marker of plaque vulnerability. It is not known whether myeloperoxidase is associated with different coronary morphologies (ie, rupture or erosion of the culprit lesion) in patients with acute coronary syndrome. Methods and Results—Twenty-five consecutive patients (aged...
The temporal evolution of ripple pattern on Ge, Si, Al 2 O 3, and SiO 2 by low-energy ion beam erosion with Xe (+) ions is studied. The experiments focus on the ripple dynamics in a fluence range from 1.1 × 10(17) cm(-2) to 1.3 × 10(19) cm(-2) at ion incidence angles of 65° and 75° and ion energies of 600 and 1,200 eV. At low fluences a short-wavelength ripple structure emerges on the surface t...
Experimental results on ion sputtered surfaces, covering amorphous and crystalline materials (SiO2 [1]), and both metals (Ag [2]) and semiconductors (Ge [3], Si [4,5]), have motivated extensive theoretical work aiming to uncover the mechanism responsible for ripple formation and kinetic roughening. A particularly successful model has been proposed by Bradley and Harper (BH) [6], in which the he...
This in vitro study evaluated the bond strength of adhesive restorative materials to sound and eroded dentin. Thirty-six bovine incisors were embedded in acrylic resin and ground to obtain flat buccal dentin surfaces. Specimens were randomly allocated in 2 groups: sound dentin (immersion in artificial saliva) and eroded dentin (pH cycling model - 3× / cola drink for 7 days). Specimens were then...
BACKGROUND Neutrophils in unstable atherosclerotic lesions have not received much consideration, despite accumulating evidence suggesting a link between systemic inflammation and acute coronary syndromes. METHODS AND RESULTS Coronary artery segments were obtained at autopsy from 13 patients with acute myocardial infarction (AMI); 8 had a ruptured and 5 an eroded plaque. Patients (n=45) who ha...
PURPOSE To evaluate the influence of different pretreatments on the microtensile bond strength (µTBS) of an etch-and-rinse adhesive to eroded dentin. MATERIALS AND METHODS Thirty-six human teeth were ground down to their dentin layer and randomly divided into six groups (G1-G6; n = 6), G1 being the control group. Only in the test groups (G2-G6) were samples subjected to erosion using citric a...
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