Search results for "AHS"

Investigation of thick sheet AHSS springback in combined bending under tension

2012

In this paper, we investigate the springback behavior of several advanced high-strength sheet steels (TRIP, Dual-Phase, ferrite-bainite) with thicknesses up to 4 mm. Samples were tested by means of the bending-under-tension (BUT) test. The BUT has been extensively applied, in the literature, to relatively thin (1 mm and thinner) sheet metals for automotive applications; the applicability of several guidelines from the literature was investigated in this work in the context of thick advanced high strength steel (AHSS) sheets and using a sample width of 12 mm. The monotonic decrease of springback as back force increased was confirmed for this category of sheet steels, and a general trend for …

A preliminary study on the ecotoxic potency of wastewater treatment plant sludge combining passive sampling and bioassays.

2021

Highlights • The passive samplers collected bioavail able and bioaccessible chemicals from the WWTP sludge samples. • The sampler extracts were acutely and chronically toxic to water flea. • The sampler extracts were cytotoxic and genotoxic. • The sludge treatment such as composting and digesting diminished the toxicity. • Effect-based methods should be part of the risk assessment of sludge recycling. Sewage sludge is an inevitable byproduct produced in wastewater treatment. Reusing nutrient-rich sludge will diminish the amount of waste ending in soil dumping areas and will promote circular economy. However, during sewage treatment process, several potentially harmful organic chemicals are …

The use of lightweight expanded clay aggregate (LECA) as sorbent for PAHs removal from water.

2012

Author's version of an article in the journal: Journal of Hazardous Materials. Also available from the publisher at: http://dx.doi.org/10.1016/j.jhazmat.2012.03.038 Lightweight expanded clay aggregate (LECA) has been explored as a sorbent for the removal of PAHs (phenanthrene, fluoranthene and pyrene) from water. The efficacy of LECA as a sorbent for PAHs was assessed using contact time, mass of sorbent and sorption isotherms in a series of batch experiments. Maximum (optimum) sorption was reached at 21 h after which the amount of PAHs sorbed remained almost constant. Batch experiments were conducted by shaking a 100 ml solution mixture of individual PAHs (containing 0.02 mg/L) with LECA. T…

La Fetuina A, il gentipo AHSG e la calcificazione coronarica

Simeizas teleskopa montāžas gaita Friča Blumbaha fotogrāfijās

2022

Latvijas Universitātes Muzeja F. Candera un Latvijas astronomijas kolekcijas krājumā atrodas latviešu astronoma un metrologa Friča Blumbaha (1864 – 1949) 23 uzņemtās fotoplates un 3 papīra fotogrāfijas, kas atspoguļo viņa līdzdalību Simeizas viena metra teleskopa tapšanā 1922. - 1925. gadā. Tajās redzams F. Blumbahs, teleskopa izgatavotājfirmas Grubb Telescope Company darbinieki un Krievijas pārstāvji, kas bija iesaistīti pasūtījuma veikšanā. Attēlos labi redzamas atsevišķas teleskopa daļas, galvenais spogulis un teleskopa kupols. Tekstā aprakstīta Simeizas teleskopa pasūtīšana, izgatavošana, izmantošana Simeizā un teleskopa bojāeja Otrā pasaules kara laikā.

How building an underwater pipeline connecting Libya to Sicilian coast is affecting environment: polycyclic aromatic hydrocarbons (PAHs) in sediments…

2009

The purpose of this study was to determine the variation of concentrations and distribution of PAHs in the sediments of the Gela coastal area (Italy) caused by the construction of an underwater pipeline connecting Libya to Sicilian coast. The receiving terminal of offshore pipeline, crossing the Mediterranean Sea, 516 Km long, up to 1127 meters deep, is located in Gela (Sicily, Italy). No bibliographic data regarding hydrocarbons are available for this area. In this paper we report the results of analysis on the water and organic along PAHs.The total concentrations of 16 PAHs in the sediments, analyzed during five surveys, ranged from 2.4 to 434 microg/kg of dry weight. The highest concentr…

Inženierzinātņu profesora Artura Tramdaha (1884–1970) intelektuālais un kultūrvēsturiskais mantojums Latvijas Universitātes Bibliotēkā

2017

The article presents the main data about Professor of Civil Engineering Arturs Tramdahs (1884–1970) life and his work at the University of Latvia (1919–1952). The inventory books of the Library of the Engineering Faculty store valuable information about his book donations to the Library – 89 books in total. These books with inscriptions and autographs by the Professor have a special cultural and historical meaning.

Isomer effects in fragmentation of Polycyclic Aromatic Hydrocarbons

2015

We have observed significant differences in the fragmentation patterns of isomeric Polycyclic Aromatic Hydrocarbon (PAH) cations following collisions with helium atoms at center-of-mass energies around 100 eV. This is in contrast to the situation at other collision energies or in photo-absorption experiments where isomeric effects are very weak and where the lowest-energy dissociation channels (H- and C2H2-loss) domihate in statistical fragmentation processes. In the 100 eV range, non-statistical fragmentation also competes and is uniquely linked to losses of single carbon atoms (CHx-losses). We find that such CHx-losses are correlated with the ionic ground state energy within a given group…

CEFLES2: The remote sensing component to quantify photosynthetic efficiency from the leaf to the region by measuring sun-induced fluorescence in the …

2009

The CEFLES2 campaign during the Carbo Europe Regional Experiment Strategy was designed to provide simultaneous airborne measurements of solar induced fluorescence and CO<sub>2</sub> fluxes. It was combined with extensive ground-based quantification of leaf- and canopy-level processes in support of ESA's Candidate Earth Explorer Mission of the "Fluorescence Explorer" (FLEX). The aim of this campaign was to test if fluorescence signal detected from an airborne platform can be used to improve estimates of plant mediated exchange on the mesoscale. Canopy fluorescence was quantified from four airborne platforms using a combination of novel sensors: (i) the prototype ai…

Response of soil phosphatase activities to contamination with two types of tar oil.

2018

Tar oil is a complex mixture of hydrocarbon compounds obtained from high-temperature distillation of coal tar. It has been used for over 100 years from now to protect wood and has been applied to wood products, primary utility poles, and railroad ties by pressure methods. Composition of the tar oil depends on the source and typically consists of 85% polycyclic aromatic hydrocarbons (PAHs), 10% phenolic compounds, and 5% heterocyclic compounds. In this research, we performed the laboratory experiment to compare two types of tar oil: C and GX-Plus, and their effects on P-cycling enzymes (phosphatases) in sandy loam and loamy sand. Tar oil was applied to soil samples at the following doses: 2,…