Search results for "Lag"
showing 10 items of 3124 documents
From Myth to Science. A Short Survey on Heredity and Its Causes in Ancient Greece
2017
In this contribution, I deal with the notion of “cause” concerning hereditary diseases in ancient Greece. A notion of hereditary disease is already foreshadowed in myths, where guilt is often depicted as a pathologic contamination (miasma) affecting both the individual and his offspring (ghenos). The notion of miasma especially concerns diseases whose signs are not visible: in such cases, either gods or maleficent daemons were believed to harass human beings and inflict them punishments that took the shape of diseases. Contamination mainly spreads itself by means of blood-shedding: the slaughter of kinsmen (especially the murder of one’s parents) was widely considered as a main cause of man…
From arsenic to DDT: Pesticides, Fascism and the invisibility of toxic risks in the early years of Francoist Spain (1939-1953)
2021
This paper reviews the way in which Spanish agriculture climbed onto the pesticide treadmill. We claim that Fascist policies and expert advice assembled in the early 1940s accelerated the introduction of pesticides into Spanish agriculture and promoted the emergence of the Spanish pesticide industry in the times of autarky. Agricultural engineers were the key protagonists in this process, but other human and non-human actors also played a pivotal role: a new pest (the Colorado beetle), Francoist politicians, farmers, landowners and industry managers. Our focus is on the use of pesticides against the Colorado beetle (the main threat to the potato crop), and the transition from arsenical pest…
Paper contagions
2022
Over the weeks of forced self-confinement imposed on us by the pandemic, many of us discovered a sort of thematic library, one which this exceptional and dramatic event seems to have generated by itself: novels, stories, and creative writing more generally that tell of epidemics and quarantines, contagions and pandemics.
Accounting for littoral primary production by periphyton shifts a highly humic boreal lake towards net autotrophy
2016
1. The prevailing view that many humic lakes are net heterotrophic is commonly based on pelagicmeasurements alone. Poor light conditions in humic lakes are assumed to constrain littoral primaryproduction (PP), such that the littoral zone has been considered an insignificant contributor towhole-lake PP. However, that assumption is based on models and inferences from pelagic processeswhich do not take littoral zone structure into account. Many lakes have an extensive ring of aquaticvegetation lying near the water surface, which provides substratum for epiphytic algae under well-illuminated conditions.2. We measured both pelagic and littoral PP and community respiration (CR) in Mekkoj€arvi, a s…
Autochthonous organic matter promotes DNRA and suppresses N2O production in sediments of the coastal Baltic Sea
2021
Coastal environments are nitrogen (N) removal hot spots, which regulate the amount of land-derived N reaching the open sea. However, mixing between freshwater and seawater creates gradients of inorganic N and bioavailable organic matter, which affect N cycling. In this study, we compare nitrate reduction processes between estuary and offshore archipelago environments in the coastal Baltic Sea. Denitrification rates were similar in both environments, despite lower nitrate and carbon concentrations in the offshore archipelago. However, DNRA (dissimilatory nitrate reduction to ammonium) rates were higher at the offshore archipelago stations, with a higher proportion of autochthonous carbon. Th…
Computation of lock-in range for classic PLL with lead-lag filter and impulse signals
2016
For a classic PLL with square waveform signals and lead-lag filter for all possible parameters lock-in range is computed and corresponding diagrams are given. peerReviewed
The longitudinal development of employee well-being: a systematic review
2016
This article reports a systematic review of findings on the long-term development of employee well-being, taking into account the effects of time lag, age, and job change. High-quality quantitative empirical studies focusing on employee affective well-being based on the circumplex model and utilizing measurements at more than two points in time were searched from eight databases. The systematic analysis of the 40 studies revealed that the level of employee well-being was generally high but not fixed – instead changes in mean levels over time were typical. In addition, the stability of well-being was found to be relatively low, as the explained variances were below 50%. Age and change of job…
Patrimonio storico e accessibilità dei centri minori del Parco delle Madonie in Sicilia
2022
Il massiccio montuoso appenninico delle Madonie, sito nella costa settentrionale siciliana tra i fiumi Imera e Pollina, accoglie nei suoi 39.679 ettari ben 21 centri storici minori sparsi, custodi di un patrimonio di tradizioni e valori che costituiscono l’identità dei luoghi, ormai affidata esclusivamente alla memoria collettiva di una popolazione sempre più anziana e inattiva. Posizionati tra l’altitudine minima del paese di Alimena di 218m s.l.m. e la massima di Geraci Siculo di 1.077m s.l.m., i piccoli e grandi borghi si dispongono da costa a monte, distanti dai grandi centri di agglomerazione urbana e di servizio. Caratterizzati da un patrimonio edilizio fortemente legato alle tradizio…
Artificial cartilage bio-matrix formed of hyaluronic acid and Mg2+-polyphosphate.
2016
Here we show that inorganic polyphosphate (polyP), a polyanionic metabolic regulator consisting of multiple phosphate residues linked by energy-rich phosphoanhydride bonds, is present in the synovial fluid. In a biomimetic approach, to enhance cartilage synthesis and regeneration, we prepared amorphous polyP microparticles with Mg2+ as counterions. The particles were characterised by X-ray diffraction (XRD), energy-dispersive X-ray (EDX) and Fourier transformed infrared spectroscopic (FTIR) analyses. Similar particles were obtained after addition of Mg2+ ions to a solution containing hyaluronic acid, as a major component of the synovial fluid, and soluble Na-polyP. The viscous paste-like ma…
Biogas production from ensiled maize with and without hydrothermal pretreatment
2010
Energy crops are suitable substrates for anaerobic digestion. In the future their use will probably increase, and among other things optimum storage and pretreatment technologies should be developed. In this study eight maize silage varieties grown in Piikkiö, Southern Finland were used as substrates in anaerobic digestion. Also hydrothermal pretreatment was used to improve the biogas yield. Composition of the maize silage and the pretreated maize silage were analyzed and inhibitors were analyzed from the pretreated maize silage. The maize silages produce methane as much as fresh maizes in previous studies, when losses during the ensiling are taking into account and even 25-50 % more when l…