Search results for " sand"
showing 10 items of 108 documents
Solid state joining of thin hybrid sandwiches made of steel and polymer: A feasibility study
2020
The growing demand for more environmentally friendly vehicles has led to an increased use of light materials in the transportation industry with the aim to reduce structural weight, fuel consumption, and gas emissions, thereby boosting cost-effectiveness and recyclable properties. Complex multi-material steel-based components would allow to improve mechanical properties and minimize weight even further. In particular, new sandwich materials made by steel outer skins and a polymeric internal layer seems very promising for obtaining mechanical performance and lightness at the same time. Unfortunately, traditional welding techniques, like arc welding, laser welding, and resistance spot welding…
Food Habits of the Javelin Sand Boa Eryx jaculus (Linnaeus 1758; Serpentes, Erycidae) in Sicily, Italy
2021
The Javelin Sand Boa, Eryx jaculus, is reported to be a predator of mammals, lizards and their eggs, and occasionally of birds and invertebrates, but data on its diet are scarce and fragmentary. Here we describe some aspects of the feeding behavior of E. jaculus on the Mediterranean island of Sicily. A total of 132 individual snakes were examined. Prey remains were found in 43% of them, both in their feces (82.5%) and gut contents (17.5%). The number of snakes observed and their feeding rate decreased in August, probably as a result of the relatively higher temperatures. Feeding rate increases were observed in adult females in September, perhaps to enhance body reserves before hibernation. …
Income and expenses of Jan Karol Chodkiewicz (1686–1712), starost of Veliuona, Zabłudów, Baisogala and Daugeliskis, relating to his schooling in Wars…
2021
Postać Jana Karola Chodkiewicza (1686–1712) z linii supraskiej nie doczekała się do tej pory swojego opracowania choćby w postaci noty biograficznej. Artykuł niniejszy przybliża więc wybrany fragment z życiorysu wyżej wymienionego bohatera, który w latach 1700–1705 przebywał na naukach w szkole jezuickiej w Warszawie. Okres nauk stanowił ważne wydarzenie w życiu młodych magnatów, którzy w ich ramach przygotowywali się do służby państwowej i funkcjonowania w społeczeństwie szlacheckim. Nie inaczej było w przypadku Jana Karola, dziedzica ogromnej fortuny chodkiewiczowskiej, który resztę swojego krótkiego życia spędził później na sporach o dobra ojczyste. Młody starosta pobierał nauki w trudny…
A Closed Book: Opacity of the Human Self in Mullā Ṣadrā
2014
Mullā Ṣadrā Shīrāzī (d. 1636) subscribes at large to the Avicennian view according to which the human subject is always and fully aware of herself. At the same time, his eschatology hinges on the Qur’ānic motive of the soul as a closed book that is first opened on the Final Day, that is, on the idea that each soul’s share in the afterlife should be understood as the full revelation of the soul’s true nature to itself. The two ideas thus have seemingly contradictory entailments: the soul is fully aware of and transparent to itself, but at the same time it has aspects that can remain opaque to it, at least in this life. The task of this paper is to investigate whether Ṣadrā can coherently hol…
Jan Karol Chodkiewicz (1686–1712) – szkic biograficzny młodego magnata
2021
Artykuł stanowi próbę zaprezentowania postaci Jana Karola Chodkiewicza z linii supraskiej (1686–1712), syna starosty błudeńskiego i oboźnego wielkiego litewskiego Jerzego Karola Chodkiewicza oraz Marianny Tekli z Naruszewiczów, który do tej pory nie doczekał się żadnego szerszego opracowania naukowego. Podstawę źródłową szkicu biograficznego Chodkiewicza stanowią materiały przechowywane w Archiwum Narodowym w Krakowie, w zespole Archiwum Młynowskie Chodkiewiczów. Różnorodność znajdujących się w nim dokumentów pozwoliła na możliwie jak najdokładniejsze odtworzenie jego życiorysu. Z niego wyłania się postać Jana Karola, który osierocony przez ojca w dzieciństwie zdany był na opiekę swojej mat…
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,…
Effect of biochar on the physical and structural properties of a sandy soil
2019
Abstract Biochar application to soil can be considered as a means to improve soil quality, thereby optimizing irrigation management and reducing irrigation needs, especially in dryland regions. This paper is aimed at investigating the effect of biochar (BC) on a desert sandy soil (Al Foah, United Arab Emirates) in terms of bulk density, porosity, water retention, plant available water (AWmax), aggregate stability (AS) and specific surface area (BET-SSA). BC was produced from forest biomass (Italy). Soil water retention was measured by the High Energy Moisture Characteristic (HEMC) and by pressure plate measurements, by using BC fractions equal to 0 (soil only), 0.014, 0.091, 0.23, 0.33 and …
Effects of Biochar on Irrigation Management and Water Use Efficiency for Three Different Crops in a Desert Sandy Soil
2020
This paper aimed at investigating if the application of biochar (BC) to desert sand (DS) from the United Arab Emirates (UAE), characterized by a very poor soil-water retention (SWR) and by a very low value of the maximum water available for crops (AWmax), could positively affect soil water balance, by reducing the irrigation needs (VIRR) and improving the irrigation water use efficiency (IWUE) and the water use efficiency (WUE). The analysis was performed for three crops, i.e., wheat (Triticum aestivum), sorghum (Sorghum vulgare) and tomato (Lycopersicon esculentum). BC was applied to the DS at different fractions, fBC (fBC = 0, 0.091, 0.23 and 0.33). Drip irrigation was adopted as a highly…
Nuovi dati sulla presenza di Eryx jaculus (Linnaeus, 1758) in Sicilia
2017
The javelin sand boa {Eryx jaculus) is a snake belonging to the Erycidae family, distributed in North Africa, southern Balkans and the Middle East. Recently its presence was confirmed in Italy, in a small area along the coast of south-central Sicily, in the territories of Licata (province of Agrigento). This paper reports the current distribution area, of about 52 km2, obtained by the Minimum Convex Polygon method, using recent bibliographical ob-servations and three new observations carried out between 15 August 2014 and 30 Aprii 2016. The new findings are located east of the known Sicilian distribution area and indicate for the first time the presence of the javelin sand boa in the provin…
Stability of solution for Rao-Nakra sandwich beam model with Kelvin-Voigt damping and time delay
2022
This paper deals with stability of solution for a one-dimensional model of Rao?Nakra sandwich beam with Kelvin?Voigt damping and time delay given by ??1?1?????? ? ??1?1?????? ? ??(??? + ?? + ??????) ? ?????????? ? ??????????( ? , ?? ? ??) = 0, ??3?3?????? ? ??3?3?????? + ??(??? + ?? + ??????) ? ?????????? = 0, ????????? + ?????????????? ? ????(??? + ?? + ??????)?? ? ?????????? = 0. A sandwich beam is an engineering model that consists of three layers: two stiff outer layers, bottom and top faces, and a more compliant inner layer called ?core layer?. Rao?Nakra system consists of three layers and the assumption is that there is no slip at the interface between contacts. The top and bottom lay…