Autor: Marin, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Design and Motion Synthesis of Modular Walking Robot Mero
Autorzy:: Ion, I. E.
Marin, A.
Curaj, A.
Vladareanu, L.
Powiązania:: https://bibliotekanauki.pl/articles/384893.pdf
Data publikacji:: 2008
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: walking robot
modular walking robot
robot control
shift mechanism
Opis:: The walking robots are built to displace the loads on the not-aligned terrain. The mechatronic walking system protects much better the environment when its contact with the soil is discrete, a fact that limits the area that is crushed appreciatively. At the Polytechnic University of Bucharest a walking modular robot to handle farming tools has been developed. This walking robot has three twolegged modules. Every leg has three freedom degrees and a tactile sensor to measure the contact, which consists of the lower and upper levels. The body of the MERO (MEchanism RObot) walking robot carries a gyroscopic bearing sensor to measure the pitch and roll angles of the platform. The legs are powered by hydraulic drives and are equipped with potentiometric sensors. They are used to control the walking robot in the adaptability to a natural ground. A vehicle like that is Romanian Walking Robot MERO (Fig.1).
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2008, 2, 4; 25-30
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Pourbaix diagrams for copper ores processing with seawater
Autorzy:: Marín, Oscar A.
Ordóñez, Javier I.
Gálvez, Edelmira D.
Cisternas, Luis A.
Powiązania:: https://bibliotekanauki.pl/articles/1449342.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: Pourbaix-diagram
Eh-pH diagrams
seawater
copper minerals
Chilean mining
Opis:: Decreases in the copper grade, waste disposal, energy supply, and water scarcity are some of the most critical challenges for the copper mining industries. One of the alternatives to counteract the water scarcity is the use of seawater, whether raw, partially desalinated, or desalinated. The use of seawater implies the generation of several compounds as a result of the interaction of ions in waters and ores. For this reason, it is required a greater understanding of these compounds generated on mineral processing, being Pourbaix diagrams used to estimate the possible compounds that will be formed in an aqueous medium for a given metal ore. In this paper, the effect of temperature, salinity, and Cu-concentration on the stability of the copper-solid species was investigated by constructing Pourbaix diagrams for different copper ore types with seawater. The results show that the corrosion areas decrease when the temperature increases for both oxidized and sulfide minerals. It was confirmed that the concentration is a critical variable that influences the size of corrosion areas. In terms of the effect of the other ions that seawater contains, carbonate, chloride, and bromide affect the stability of the Cu-solid species. The proposed diagrams serve as a useful tool to predict the stable species that may be obtained when seawater is used. The use of seawater in mining is an essential issue because it is considered as a more sustainable alternative instead of use freshwater or desalinated seawater, especially in locations with complex water availability, as is northern Chile.
Źródło:: Physicochemical Problems of Mineral Processing; 2020, 56, 4; 625-640
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Investigation of the Low Frequency Polarization Mechanisms in Magnetic Fluids
Autorzy:: Marin, C.
Malaescu, I.
Savici, A.
Powiązania:: https://bibliotekanauki.pl/articles/1399307.pdf
Data publikacji:: 2013-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Mm
77.22.Ej
77.22.Ch
31.30.jn
Opis:: The dielectric behaviour of a magnetic fluid with magnetite particles dispersed in kerosene was analyzed. Therefore, the frequency (f) and temperature (T) dependences of the complex dielectric permittivity, ε (f, T), over the ranges 4 kHz to 2 MHz and 25C to 90C were measured. Based on the experimental results of ε (f, T) and using the Clausius-Mossotti equation, we have determined the temperature dependence of the real part of the total polarizability α', of a magnetic fluid. The computations have taken into account that the magnetic fluid consists of three components, namely magnetite particles, surfactant, and carrier liquid. The results show that at a given frequency, α' increases with temperature in the low frequency range (4 kHz to 100 kHz) and decreases with temperature above 100 kHz. This behaviour demonstrates that in low frequency range the polarization mechanism related to the deformation of the counter ions atmosphere around each particle is predominant and above 100 kHz the orientation of the dipole moments is the main polarization mechanism of the magnetic fluid. These measurements enabled the evaluation of the effective dipole moment of the magnetic fluid, in order of $1.21 \times 10^{-30} C m$.
Źródło:: Acta Physica Polonica A; 2013, 124, 4; 724-727
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Fuzzy certainty on fuzzy values
Autorzy:: Gonzales, A.
Marin, N.
Pons, O.
Vila, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/970957.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: fuzzy certainty
uncertainty qualification
fuzzy statements
fuzzy values
information measure
Opis:: Imprecision and uncertainty appear together in many applications of soft computing. Imprecise and uncertain values are usually expressed by means of linguistic terms, specially when they have been provided by or for a human being. However, in many applications it is desirable that both aspects are combined into a single value that appropriately describes the intended information. In this work, we extend our previous research on this topic and we study how to combine imprecision and uncertainty when both of them are expressed by fuzzy numbers and the final goal is to obtain a normalized fuzzy value that provides the same amount of information about the described fact.
Źródło:: Control and Cybernetics; 2009, 38, 2; 311-339
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Sfałszowane inhibitory fosfodiesterazy typu 5 – narastające zagrożenie dla zdrowia publicznego
Counterfeit phosphodiesterase type 5 inhibitors – growing safety risks for public health
Autorzy:: Fijalek, Z.
Sarna, K.
Blazewicz, A.
Marin, J.
Powiązania:: https://bibliotekanauki.pl/articles/876389.pdf
Data publikacji:: 2010
Wydawca:: Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:: leki
wyroby medyczne
zafalszowania
inhibitory fosfodiesterazy
zdrowie publiczne
zagrozenia zdrowia
suplementy diety
przestepczosc
drug
medical product
adulteration
phosphodiesterase inhibitor
public health
health hazard
diet supplement
crime
Opis:: Sfałszowane leki, wyroby medyczne i suplementy diety stanowią narastający i bardzo poważny problem dla zdrowia publicznego na świecie. W Europie w ostatniej dekadzie związany jest on przede wszystkim z rejestracją inhibitorów fosfodiesterazy typu 5 (PDE-5) stosowanych na dysfunkcję erekcji. Do grupy tej należą Viagra, Levitra i Cialis. Ocenia się, że ok. 2,5 min mężczyzn w Europie narażonych jest na sfałszowane produkty zawierające sildenafil, tyle samo co kupujących go w legalnej sieci dystrybucji. Zgodnie z deklaracjami Rady Europy fałszowanie produktów leczniczych i suplementów diety; na każdym etapie, od ich wytwarzania do podawania pacjentom, jest poważnym przestępstwem kryminalnym, które zagraża ludzkiemu życiu. Powoduje też zachwianie wiarygodności narodowych systemów ochrony zdrowia i nie może być traktowane jedynie jako naruszanie praw własności intelektualnej. W Polsce problem monitorowany jest przez Narodowy Instytut Leków, wykonujący badania skriningowe nielegalnych i sfałszowanych produktów metodami tandemowej spektrometrii mas i rentgenowskiej dyfrakcji proszkowej.
Counterfeit drugs, medical devises and dietary supplements are inherently dangerous and a growing problem. In Europe the growth of the counterfeit medication market is attributable in part to registration of phosphodiesterase type 5 inhibitors (PDE-5) used for the erectile dysfunction. Viagra, Levitra and Cialis belong to this group. It has been estimated that up to 2.5 million men in Europe are exposed to an illicit sildenafil, suggesting that there may be as many illegal as legal users of sildenafil. In Europe a strong trend is observed towards increasingly professional counterfeits and imitations of Viagra, Cialis and Levitra, with regard to the appearance of tablets, capsules and packaging. The professional presentation will deceive potential consumers into assuming these products are legal, efficacious and safe. Globally, increased obstacles for counterfeiters are necessary to combat pharmaceutical counterfeiting, including fines and penalties. The worldwide nature of the counterfeit problem requires proper coordination between countries to ensure an adequate enforcement. We described the usefulness of the time-of-flight mass spectrometry with the electrospray ionization (LC-ESI-MS-TOF) and the X-ray powder diffraction method (XRPD) for PDE-5 counterfeit screening from the Polish illegal market.
Źródło:: Roczniki Państwowego Zakładu Higieny; 2010, 61, 3
0035-7715
Pojawia się w:: Roczniki Państwowego Zakładu Higieny
Dostawca treści:: Biblioteka Nauki