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Tytuł:
Construction of sentences with specific interpretability properties
Autorzy:
Stern, A.
Powiązania:
https://bibliotekanauki.pl/articles/1208640.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
The Rowland Institute for Science, 100 Cambridge Parkway, Cambridge, Massachusetts 02142, U.S.A. A construction is presented for generating sentences that satisfy a recursively enumerable set of interpretability properties. This construction is then used to prove three previously announced results concerning the lattice of local interpretability types of theories (also known as the Lattice of Chapters).
Źródło:
Fundamenta Mathematicae; 1993, 142, 2; 189-200
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MTX-1 – A Potential Replacement for Tetrazene in Primers
Autorzy:
Fronabarger, J. W.
Williams, M. D.
Stern, A. G.
Parrish, D. A.
Powiązania:
https://bibliotekanauki.pl/articles/357958.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
MTX-1
tetrazene
sensitizer
primer
Opis:
Tetrazene (1-amino-1(1H-tetrazol-5-yl)-azo-guanidine hydrate) is widely used in ordnance systems as a sensitizer of primer mixes for use in both percussion and stab applications. It has low thermal and hydrolytic stability compared with other components of primer mixes and there currently exists the need for a replacement with enhanced stability characteristics. MTX-1 (1-[(2E)- 3-(1H-tetrazol-5-yl)triaz-2-en-1-ylidene]methanediamine) meets these criteria and shows great promise as a tetrazene replacement. Preliminary testing of this material has confirmed that MTX-1 has safety and performance properties which are similar to tetrazene and has chemical characteristics, including thermal and hydrolytic stability, which exceed those of tetrazene. MTX-1 has been successfully evaluated against tetrazene in a variety of chemical/output tests, including comparative testing in the PVU-12 primer.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 1; 33-52
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Art of Miss Irma Stern: Ugliness as a Cult
Sztuka Irmy Stern: brzydota jako kult
Autorzy:
Pawłowska, Aneta
Powiązania:
https://bibliotekanauki.pl/articles/2056550.pdf
Data publikacji:
2022-05-16
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
Irma Stern
Afryka Południowa
ekspresjonizm
malarstwo
sztuka
South Africa
expressionism
painting
art
Opis:
The purpose of this article is to present the life and work of a well-known and celebrated South African painter of German-Jewish origin – Irma Stern (1894-1966). The artist was one of the first painters from South Africa whose works fitted well into the expressionist trend. Irma Stern’s artistic development was influenced by numerous trips to Europe and her studies at German art schools and academies. Her African roots were another important source of inspiration for her. Stern, who travelled all over Africa (including South Africa, Zanzibar and Congo) created numerous portraits of its indigenous peoples surrounded by wild nature. In her works, she most often presented an idyllic vision of the African continent, but one whirling with life and dynamism, thus reflecting her personal views of Africa as a real ‘paradise.’
Celem niniejszego artykułu jest przedstawienie życia i twórczości znanej i cenionej malarki południowoafrykańskiej pochodzenia żydowsko-niemieckiego – Irmy Stern (1894-1966). Artystka była jedną z pierwszych malarek pochodzących z RPA, której prace dobrze wpisują się w nurt ekspresjonistyczny. Na rozwój twórczy Irmy Stern wpłynęły liczne podróże do Europy oraz studia w niemieckich szkołach i akademiach artystycznych. Ważnym źródłem inspiracji były też jej afrykańskie korzenie oraz liczne podróże po kontynencie afrykańskim (m.in. RPA, Zanzibar i Kongo). Malarka stworzyła liczne portrety rdzennych mieszkańców Afryki w otoczeniu dzikiej przyrody. W swoich pracach najczęściej prezentowała idylliczną, ale jednocześnie pełną życia i dynamiki wizję kontynentu afrykańskiego, co odzwierciedlało jej osobiste spojrzenie na Afrykę jako prawdziwy „raj na ziemi”.
Źródło:
Roczniki Humanistyczne; 2022, 70, 4; 99-121
0035-7707
Pojawia się w:
Roczniki Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An improvement in ro-ro stern berthing modelled on a case study
Autorzy:
Perkovic, M.
Batista, M.
Vidmar, P.
Luin, B.
Powiązania:
https://bibliotekanauki.pl/articles/135160.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
mooring analysis
buoy engineering
accident
ro-ro
windage
tramontana
simulation
Opis:
The high volume transported by ro-ro vessels has not come without a price. Accidents and incidents related to design – lack of bulkheads, instability, problems with cargo access doors, stowage, securing cargo and lifesaving appliances – are growing along with the size of the vessels themselves. One particular and recurrent problem is the degree of these giant box-like high riding vessels exposed to wind. Recently the effect of a tramontana – a fierce, sudden and short term regional wind – in the Port of Koper was to detach a moored ship, causing an accident. This paper will present a study of that accident, and through simulations and modelling determine an improvement that will allow berthing perpendicular to the stern ramp to function more securely.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 134-142
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing the potential replacement of mineral oil with environmentally acceptable lubricants in a stern tube bearing: an experimental analysis of bearing performance
Autorzy:
Kowalski, Jerzy
Leśniewski, Wojciech
Piątek, Daniel
Cuper-Przybylska, Dominika
Powiązania:
https://bibliotekanauki.pl/articles/2033285.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
environmentally acceptable lubricants
EALs
mineral oil
stern tube bearing
bearing wear
marine bearing
Opis:
This study compares the performance of a plain bearing, with a similar structure to a tail shaft stern bearing, lubricated with either mineral oil or an environmentally acceptable lubricant (EAL). The main characteristic of the bearing is its length/diameter ratio of <1. Measurements are carried out with the bearing operating under loads from 0.5 to 1 MPa and seven speeds ranging from 1 to 11 rev/s. The bearing lubricated with either mineral oil with a viscosity grade of 100 or an environmentally acceptable lubricant (EAL) with a viscosity grade of 100 or 150 is investigated according to the ISO standard. Bearing wear is simulated by increasing the clearance circle by 0.1 mm. According to the results obtained, the use of an EAL in place of mineral oil does not cause significant changes in the bearing performance, regardless of the value of the clearance radius. The pressure distribution in the oil film, bearing load carrying capacity, eccentricity and friction coefficient have similar values for the entire load and speed ranges considered, and the discrepancies in the results are within the range of the measurement errors. Only an increase in EAL viscosity causes significant changes in bearing performance and these changes comply with the general theory of lubrication.
Źródło:
Polish Maritime Research; 2021, 4; 160-166
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying a Gouy–Chapman–Stern Model for Adsorption of Toxic Metals to Soils in Arsenic Affected Areas of Chhattisgarh
Autorzy:
Bhui, Ashish Kumar
Sen, Satish Kumar
Powiązania:
https://bibliotekanauki.pl/articles/1031874.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Electrostatic models
Gouy-Chapman
heavy metal Phytoremidation
toxic metals
Opis:
An effective adsorption model was developed by S. Nir in 1978 for predicting adsorption to synthetic membranes and was also adapted by him afterwards to clay minerals. The main principles of the model are the solution of the electrostatic Gouy-Chapman equations while calculating the adsorbed amounts of the cations as the sum of those residing in the double-layer region and the cations that are chemically bound in a closed system. Thus, the equilibrium concentration in solution is influenced by the adsorption as the function of the amounts bound. The model was later developed and adapted for the adsorption of METAL cations, and, in most cases, the fit of calculated results to measured adsorbed amounts of cations was very good, after calibrating the model for the chemical tested, with only two adjustable parameters for each chemical. In the current work, we tested the applicability of this model for the adsorption of a monovalent and a divalent METAL cation by several soils, by considering the cation exchange capacities (CEC) and the specific surface areas (SSA) of the soils. For three out of four soils, a very good fit was obtained by using the required parameters for the calculations from previous studies of cation adsorption on clay minerals. The main advantage of the presented model over Langmuir and Freundlich adsorption isotherms is that no additional changes in the parameters were needed when the background concentration of salts in the suspensions was increased from 10 to 50 or 500 mM.
Źródło:
World News of Natural Sciences; 2020, 30, 2; 178-186
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of New York/New Jersey Harbor Sediments
Autorzy:
Jones, K. W.
Feng, H.
Stern, E. A.
Neuhäusler, U.
Osán, J.
Marinkovic, N.
Song, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2044657.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.60.-k
89.20.-a
Opis:
Sediments found in waterways around the world may contain toxic compounds of anthropogenic origin that can harm the environment and human health. As a result, it is often necessary to remove them and find disposal methods that are environmentally and economically acceptable. Here, we report on results obtained in an experimental program to characterize the nature of the sediment contamination. The objective was to gain a better understanding of the properties of the sediments to develop better methods for understanding the fate and transport of the contaminants and for improving methods for their removal from the sediments. Our investigations made use of X-ray facilities at the Brookhaven National Synchrotron Light Source and the European Synchrotron Radiation Facility at Grenoble, France. The experiments included: measurements of the microstructure of the sediments using computed microtomography, X-ray absorption, and fluorescence microscopy with resolutions as low as 0.2 micrometers to obtain information on the relationships of organic and mineral components of the sediments and on the distribution of contaminants on the surfaces of the sediment grains, investigation of functional groups of chemical compounds using X-ray absorption near-edge spectroscopy and Fourier transform infrared spectroscopy. Scanning electron microscopy and electron probe measurements were made to ascertain the morphology of the sediment surfaces and the distribution of metals on individual sediment grains.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 279-286
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A numerical model to simulate the motion of a lifesaving module during its launching from the ship’s stern ramp
Autorzy:
Dymarski, P.
Dymarski, C.
Powiązania:
https://bibliotekanauki.pl/articles/260530.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
lifeboat
rescue boat launch
innovation
launch ramp aft
computational model for simulation
Opis:
The article presents a numerical model of object motion in six degrees of freedom (DoF) which is intended to be used to simulate 3D motion of a lifesaving module during its launching from a ship using a stern ramp in rough sea. The model, of relatively high complexity, takes into account both the motion of the ship on water in changing sea conditions, and the relative motion of the ramp with respect to the ship. The motion of the ramp changes and strongly depends on its constructional and geometrical parameters. The presented model takes into account the displacement of the submerged part of the ramp, as well as its damping in the water and the interaction with the module moving on it. The results of test simulation of a module launching from the ship in still water are included.
Źródło:
Polish Maritime Research; 2014, 2; 34-40
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the stern wedge length and height on the drag and trim of a chine-planing hull
Autorzy:
Ghassemi, Mohammad A.
Ghadimi, Parviz
Sajedi, Sayyed Mahdi
Powiązania:
https://bibliotekanauki.pl/articles/2033606.pdf
Data publikacji:
2021
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
chine-planing hull
stern wedge
wedge width and height
drag
trim
pressure distribution
Opis:
This paper examines the effect of the stern wedge length and height on the drag and trim of a chine-planing hull in calm water. To this end, fluid flow was simulated by Star-CCM+ software by applying an overset mesh and k-ε turbulent model. The finite volume method was used to discretize the fluid domain, and the fluid volume was utilized to capture the generated free surface. The considered model is a prismatic planing hull with a deadrise angle of 24°, a mass of 86 kg, a length (L) of 2.64 m, and a beam (B) of 0.55 m. For validation, the numerical results of drag and trim were compared against experimental data, which displayed good compliance. Subsequently, the hydrodynamic performance of the planing hull was investigated, and the wedge effect was assessed. The stern wedge was located at the bottom and near the aft perpendicular to the hull to facilitate a moderate distribution. Various wedge lengths of 0.2B, 0.5B, and B at two different heights of 5 mm and 10 mm were examined to assess the hydrodynamic performance of the hull at various speeds. The trim angle, resistance, water surface elevation, porpoising, roster tail, and the stern and bow were computed and analyzed. Based on the numerical results, it was concluded that when the wedge length increased, the drag and trim were reduced. It was also concluded that the best wedge for a vessel with desirable wake generation is one with a length of 0.2B and a height of 5 mm.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2021, 67 (139); 39-52
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 17

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