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Wyświetlanie 1-15 z 1684
Tytuł:
MSIAC : Supporting the Munitions Safety Community
Autorzy:
Baker, E. L.
Powiązania:
https://bibliotekanauki.pl/articles/403699.pdf
Data publikacji:
2016
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
munitions
safety
risk
NATO
Opis:
The NATO Munitions Safety Information Analysis Center (MSIAC) is a multinational collaboration that collects, stores, and analyses technical information related to Munitions Safety (MS) and Insensitive Munitions (IM). This paper and presentation will provide an overview of MSIAC’s recent achievements in advancing munition safety efforts on behalf of its member nations. MSIAC supports its member nations through a variety of products and services. Poland is anticipated to become a member nation near the end of 2016. In addition to a core responsibility of addressing technical questions related to Munitions Safety posed by nations, MSIAC has a diverse programme of work aimed at developing and sharing the related underpinning scientific knowledge. This is then applied to support policy implementation and development related to munition safety. Some examples of current activities are given in this paper as well as future activities.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2016, 7, 4 (26); 7-22
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On prognosis of variation of properties of epitaxial layers by choosing of temperature field during growth
Przewidywanie zmian własności epitaksjalnych warstw poprzez dobór pola temperatury podczas wzrostu
Autorzy:
Pankratov, E.L.
Powiązania:
https://bibliotekanauki.pl/articles/29520278.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
epitaxial growth
epitaxial layer
properties
homogeneity of properties
wzrost epitaksjalny
warstwa epitaksjalna
właściwości
Opis:
In this paper, we analyze the influence of the temperature of growth of epitaxial layers during their growth. Conditions are formulated under which the homogeneity of the properties of the epitaxial layers increases. An analytical approach for the analysis of mass and heat transfer is proposed, allowing at the same time to take into account changes in the parameters of processes both in space and in time, as well as nonlinearity of these processes.
W artykule opisano analizę wpływu temperatury na wzrost epitaksjalnych warstw w procesie technologicznym. Sformułowano szereg warunków dla poprawy jednorodności badanych warstw. Wprowadzono analityczne rozwiązanie dla równania transportu masy i ciepła. To rozwiązanie umożliwiło uwzględnienie zmian parametrów procesu zarówno w przestrzeni jak i w czasie. Ponadto przeprowadzone rozwiązanie pozwoliło na uwzględnienie nieliniowości badanego procesu.
Źródło:
Computer Methods in Materials Science; 2020, 20, 1; 1-6
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Starzenie a długowieczność
Autorzy:
Gregoraszczuk, E.L.
Powiązania:
https://bibliotekanauki.pl/articles/853292.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Przyrodników im. Kopernika
Tematy:
starzenie sie
biologia starzenia
uklad immunologiczny
uklad hormonalny
uklad miesniowo-szkieletowy
mechanizmy starzenia sie
ograniczenia zywieniowe
Źródło:
Wszechświat; 2017, 118, 10-12
0043-9592
Pojawia się w:
Wszechświat
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Whey protein isolate hydrogel-based biomaterials
Autorzy:
Douglas, Timothy E.L
Powiązania:
https://bibliotekanauki.pl/articles/1844922.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
hydrogels
proteins
biomaterials
hydrożele
proteiny
biomateriały
Źródło:
Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 55
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineralized hydrogels for bone regeneration
Autorzy:
Douglas, T. E. L.
Powiązania:
https://bibliotekanauki.pl/articles/285625.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
hydrogels
biomaterials
bone regeneration
Opis:
Biomaterials for bone regeneration have predominantly been fabricated from inorganic substances such as various forms of calcium phosphate (CaP), e.g. hydroxyapatite, tricalcium phosphate and brushite. CaP materials are mechanical stable and bioactive, i.e. they form a direct bone with surrounding bone tissue. However, such pure CaP materials have certain drawbacks. They are brittle, difficult to handle in granulate form and difficult to shape in block form. Furthermore, the incorporation of biologically active substances is not easy. Hydrogels are highly hydrated three-dimensional polymer networks that are formed by crosslinking of polymer chains in solution. Hydrogels have been widely used as vehicles for drug delivery and are being used increasingly as biomaterials for tissue regeneration. As their main component is water, they have many advantages over pure inorganic materials. Firstly, the incorporation of water-soluble biologically active substances to promote tissue growth (e.g. growth factors) or to combat infection (e.g. antibiotics) is straightforward. Secondly, they are much less brittle. Thirdly, they can be implanted in a minimally invasive manner by injection, as they can undergo gelation, i.e. the transition from liquid to solid, after injection. However, their main disadvantage also stems from the fact that the mail component is water: hydrogels are mechanically weak. In order to combine the advantages of inorganic and hydrogel biomaterials, attention has recently been focused on the development of composites on the basis of mineralized hydrogels. Several strategies have been tried [1]. The most common strategy is the addition of preformed inorganic particles to the polymer solution before gelation, after which the particles remain entrapped in the crosslinked polymer network. Ideally, the particles can be distributed homogeneously in the hydrogel. The gelation process can be induced by addition of inorganic particles. For example, the addition of bioactive glass particles to a solution of the anionic polysaccharide gellan gum results in hydrogel formation due to release of ions from the particles [2]. In other words, the particles serve as an “ion-delivery system” to provide homogeneous gelation. Another strategy is to promote precipitation of the inorganic phase in the hydrogel by increasing the concentration of ions. This can be achieved biomimetically using the enzyme alkaline phosphatase (ALP) which is responsible for the mineralization of bone tissue in vivo by cleaving phosphate ions from organophosphate and thus increasing the local phosphate concentration, which in turn promotes CaP precipitation [3]. Yet another strategy is the incorporation of calcium- or phosphate-binding molecules in the hydrogel, in order to increase localion concentrations and promote CaP precipitation. Once such biomolecule is polydopamine, which binds calcium ions [4]. An added flexibility of mineralized hydrogels is the possibility of manipulation of either the hydrogel phase, or the inorganic phase, or both. For example, in the case of a hydrogel mineralized with CaP, the inorganic phase may be modified by incorporation of magnesium in order to promote adhesion and proliferation of bone-forming cells [5], or by incorporation of zinc in order to endow antibacterial activity [6]. Alternatively, the hydrogel phase may be modified by incorporation of biologically active molecules such as polyphenols, which both bind calcium ions and exhibit antibacterial activity [7]. Mineralization strategies will be illustrated on the basis of previous work [1-7].
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 8
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological localization using appearance-based recognition
Autorzy:
Akers, E. L.
Agah, A.
Powiązania:
https://bibliotekanauki.pl/articles/384533.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
topological localization
mobile robotics
computer vision
appearance-based methods
Opis:
Localization is a fundamental problem of autonomous mobile robots. Localization is the determination of the position and orientation of a robot. Most localization systems are made up of several sensors and a map of the environment. Sophisticated localization systems can solve both the global location problem and the kid-napped robot problem. Global localization is the process of placing the robot into an unknown location within the map, and the robot should be able to locate itself within a relatively short period of time. The kidnapped robot problem is similar to global localization, as it is a test of how well the robot is able to recover after becoming lost. The robot is “teleported” to a new location, and the robot should again be able to determine its new location within a relatively short amount of time. CReSIS (Center for Remote Sensing of Ice Sheets) is developing autonomous robots in an effort to measure ice sheets characteristics in Greenland and Antarctica. These robots currently rely on differential GPS for localization and navigation. In order to survive for long periods of time in these environments, however, the robots need to be able to return to campsites in order to refuel and unload the data that has been acquired. In order to perform this task effectively and safely, a more elaborate system is required. A localization system that can recognize the dfferent locations of the campsites is the beginning of this process. The approach is to use a single camera for use in multiple types of large-scale environments, indoors and outdoors using a topological map. The system described uses an appearance-based approach for recognizing the different locations. The appearance-based methods attempt to recognize the appearance of a scene rather than specific objects. Several different types of features are tested including histograms, eigenimages, and Hu Moments. Using these simple features, the system is able to determine its location within the map at 95% accuracy.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2010, 4, 1; 68-84
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new chalicotherian finding from the Miocene karst in Poland (Mammalia, Badenian)
Nowe znalezisko chalikoteriów w Mioceńskim krasie Polski
Autorzy:
Korotkievich, E.L.
Sulimski, A.
Powiązania:
https://bibliotekanauki.pl/articles/23313.pdf
Data publikacji:
1990
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Źródło:
Acta Palaeontologica Polonica; 1990, 35, 1-2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Submonolayer Coverages Using Auger Escape Depths
Autorzy:
Godowski, P. J.
Hardegree, E. L.
Powiązania:
https://bibliotekanauki.pl/articles/1931323.pdf
Data publikacji:
1994-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.Fv
68.10.Jy
82.65.My
Opis:
A simple method for determining submonolayer adsorbate coverages by means of Auger electron spectroscopy is presented. The procedure is based on the ratio of low to high kinetic energy Auger signals from the substrate alone, therefore it does not require a direct measurement of adsorbate peaks. It may be of special interest in cases where the adsorbate signal is difficult or impossible to measure, as well as when adsorbate and substrate peaks overlap or when peaks are absent (H or He) or of low intensity. The method is tested by quantification of sulphur layer on the Ni(001) and on the polycrystalline iron surface.
Źródło:
Acta Physica Polonica A; 1994, 85, 5; 843-848
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exchange Splitting of Zero-Dimensional Exciton Levels
Autorzy:
Goupalov, S. V.
Ivchenko, E. L.
Powiązania:
https://bibliotekanauki.pl/articles/1969097.pdf
Data publikacji:
1998-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Gm
73.20.Dx
78.66.-w
Opis:
A theory of nonanalytic (long-range) exchange interaction between an electron and a hole is developed for zero-dimensional excitons in semiconductor nanostructures. Two particular cases are considered in detail: (i) that of exciton confined in a spherical nanocrystal and (ii) a quantum-well exciton localized as a whole on an anisotropic island of well-width monolayer fluctuation.
Źródło:
Acta Physica Polonica A; 1998, 94, 2; 341-346
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free vibration analysis of porous functionally graded piezoelectric microplates resting on an elastic medium subjected to electric voltages
Autorzy:
Wu, C.-P.
Lin, E.-L.
Powiązania:
https://bibliotekanauki.pl/articles/38695702.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
consistent couple stress theory
functionally graded material
Winkler-Pasternak foundation
piezoelectric microplates
porous microplates
vibration
Opis:
Basing on the consistent couple stress theory (CCST), we develop a unified size-dependent shear deformation theory to analyze the free vibration characteristics of simply supported, porous functionally graded (FG) piezoelectric microplates which resting on the Winkler-Pasternak foundation are subjected to electric voltages. Various CCST-based shear deformation theories can be reproduced by incorporating their corresponding shape functions, which characterize the through-thickness distributions of the shear deformations, into the unified size-dependent theory. The reproduced CCST-based plate theories include the classical plate theory (CPT), the first-order shear deformation plate theory (SDPT), Reddy’s refined SDPT, the sinusoidal SDPT, the exponential SDPT, and the hyperbolic SDPT. The unified size-dependent theory is subsequently used to determine the natural frequencies of simply supported, porous FG piezoelectric microplates and their corresponding vibration mode shapes. The effects of the material length scale parameter, the length-to-thickness ratio, the material-property gradient index, different values of the applied voltages, the porosity parameter, different porosity distribution patterns, the Winkler spring coefficient, and the shear modulus of the surrounding medium on the natural frequencies of the porous FG piezoelectric microplates are examined and appear to be significant.
Źródło:
Archives of Mechanics; 2022, 74, 6; 463-511
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Insensitive Munitions Technology Development
Autorzy:
Baker, E. L.
Stasio, A. R.
Powiązania:
https://bibliotekanauki.pl/articles/403440.pdf
Data publikacji:
2014
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
insensitive munitions
explosives
safety
Opis:
The concept of Insensitive Munitions, or IM, is not new; the U.S. Department of Defense (DoD) has been working to improve the safety of munitions since their inception. The first NATO standard on IM, STANAG 4439: Policy for Introduction and Assessment of IM, was published for ratification in 1995 and was ratified in 1998. U.S. Congress passed the „Insensitive Munitions law” in 2001 that specifically requires „The Secretary of Defense [to] ensure, to the extent practicable, that insensitive munitions under deployment or procurement are safe throughout development and fielding when subject to unplanned stimuli”. These unplanned stimuli take the form of rapid or slow heating events, such as a fuel fire on a vehicle or aircraft, or an adjacent fire in a vehicle or storage magazine; impact by fragment or bullets due to shrapnel from nearby explosions or small arms fire from combat or terrorist events; sympathetic reaction due to the detonation of adjacent munitions; and shaped charge jet attack from rocketpropelled grenade or similar weapons used by enemy and friendly forces. In 2007, U.S. DoD focused its efforts on developing joint solutions through a centrally managed IM technology program: the Joint IM Technology Program (JIMTP). There have been numerous JIMTP IM technology development successes and transitions to munition systems. The U.S. DoD will continue to develop new munitions to meet increased performance requirements to respond to various threats and enable lethality overmatch in any scenario. Using today's available technology to obtain higher performance typically translates to a worse IM response. As a result, the U.S. DoD will continue to develop IM technology in order to assure safety and reduced vulnerability while improving munitions performance.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2014, 5, 4 (18); 7-20
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aryl hydrocarbon receptor (AhR)-linked inhibition of luteal cell progesterone secretion in 2,3,7,8-tetrachlorodibenzo-p-dioxin treated cells
Autorzy:
Gregoraszczuk, E.L.
Zabielny, E.
Ochwat, D.
Powiązania:
https://bibliotekanauki.pl/articles/70446.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
aryl hydrocarbon receptor
2,3,7,8-tetrachlorodibenzo-p-dioxin
luteal cell
progesterone secretion
steroidogenesis
Źródło:
Journal of Physiology and Pharmacology; 2001, 52, 2
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring the health of sediment ecosystem along the Mahim Creek of Mumbai - a study of physico-chemical properties
Autorzy:
Singare, P.U.
Ferns, S.E.L.
Powiązania:
https://bibliotekanauki.pl/articles/11793.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
monitoring
health
sediment ecosystem
conductivity
Mahim Creek
Mumbai city
physicochemical property
Opis:
The present study was performed for the period of one year from June 2012 to May 2013 in order to understand the physico-chemical properties of sediments samples collected along the Mahim Creek of Mumbai. The annual average pH value of the creek sediments was recorded as 9.22. It is feared that such conditions may increase the alkalinity of Creek water which according to USEPA will increase the physiological stress of many aquatic species resulting in decreased reproduction, decreased growth, disease, or death thereby reducing the biological diversity of the Creek. The total organic matter in the creek sediments was found to be maximum of 10.30 % with an annual average concentration of 6.29 %. Although organic matter is a primary source of food for benthic organisms and is important in maintaining a viable ecosystem, too much of organic matter deposited in the sediments will be responsible for depletion in dissolved oxygen content of the creek water causing unpleasant odours and may also increase the rate of eutrophication. From the results it appears that as India moves towards stricter regulation of industrial effluents to control water pollution, greater efforts are required to control the discharge of pollutants into the ecosystems.
Źródło:
International Letters of Natural Sciences; 2014, 12, 1
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1684

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