wyświetlamy 1000 najlepszych wyników Pomoc
Wyniki wyszukiwania dla: CLARITHROMYCIN RESISTANCE MUTATION
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A parametric method for evaluation of resistance of swath ships
PublikacjaArtykuł zawiera sformułowania metody parametrycznej służącej do wyznaczania oporu kadłuba statku o konfiguracji swath. Metodę opracowano opierając się na rezultatach obliczeń numerycznych, uzyskanych metodami strukturalnymi, wywiedzionymi ze sformułowań teoretycznej hydromechaniki okrętu, wykonanych na dostatecznie licznej serii kształtów kadłuba, o systematycznie uzmiennianych parametrach kształtu. Następnie przedstawiono rezultaty...
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Tire rolling resistance measurements on the road and in the laboratory
PublikacjaW pracy przedstawiono stanowisko bębnowe do badania oporu toczenia opon samochdowych w warunkach laboratoryjnych. Zaprezentowano także przyczepę dynamometryczną do badania oporu toczenia opon samochodowych w warunkach drogowych. Stanowisko bębnowe i przyczepa zosały zbudowane w Katedrze Pojazdów i Maszyn Roboczych Politechniki Gdańskiej. Omówiono wpływ wzdłużnego pochylenia drogi i naporu powietrza na badane koło na dokładność...
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Improvement of the resistance to oxidation of the ecological greases by the additives
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Examination of the epoxy coating system's resistance to Corrobill
PublikacjaThe tests of the influence of the surface cleaning agent on the epoxy coating were carried out. Electrochemical and corrosion tests were carried out. The effect of the preparation on the adhesion and hardness of the tested coating was tested.
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Determination of the transverse resistance characteristics in railway track
PublikacjaW pracy przedstawiono problem oporów poprzecznych podsypki z punktu widzenia budowy, utrzymania oraz bezpieczeństwa w eksploatacji toru kolejowego. Zaprezentowano różne sposoby analitycznego podejścia do badanego zjawiska na przykładzie modeli matematycznych spotykanych w literaturze. Scharakteryzowano aktualny stan badań doświadczalnych związanych z oporami poprzecznymi. Omówiono różne sposoby prowadzenia takich badań w eksploatowanych...
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Comparison of selected parametric methods for prediction of inland waterways ship hull resistance in towing tank test
PublikacjaIn the paper selected approximate methods for calculation of inland waterways ship resistance and their verification by towing tests, compared on the example of a small urban ferry, are presented. The test results are made for both the bare hull and the hull with appendages (skeg, azimuthal propeller). Significant differences between results of the theoretical methods and experimental ones, especially in the case of the model with...
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Effect of electrode resistance on admittance spectra of planar organic device carrying SCLC and on charge carrier mobility extracted from susceptance
PublikacjaThe work presents small signal admittance spectra of a sandwich system with thin organic layer carrying a space charge limited current. The effect of series resistance of electrodes on the spectra is discussed. Spectra of small signal capacitance are added to get more detailed insight. The analysis performed shows that the series resistance can affect both parts of small signal response within a whole range of frequency. Moreover,...
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Potential of Silver Nanoparticles in Overcoming the Intrinsic Resistance of Pseudomonas aeruginosa to Secondary Metabolites from Carnivorous Plants
PublikacjaCarnivorous plants are exemplary natural sources of secondary metabolites with biological activity. However, the therapeutic antimicrobial potential of these compounds is limited due to intrinsic resistance of selected bacterial pathogens, among which Pseudomonas aeruginosa represents an extreme example. The objective of the study was to overcome the intrinsic resistance of P. aeruginosa by combining silver nanoparticles (AgNPs)...
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Laser Beam as a Precision Tool to Increase Fatigue Resistance in an Eyelet of Undercarriage Drag Strut
PublikacjaThe article contains the results of tests on a laser-processed eyelet of undercarriage drag strut to increase its fatigue strength. Laser processing concentrated on both sides around the hole of eye for connecting the undercarriage drag strut caused that the material in this area withstood more than twice the number of load cycles established for this material. In order to determine the reasons for the increase in fatigue strength,...
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Increasing the Seismic Resistance of Wood-frame Buildings by Applying PU Foam as Thermal Insulation
PublikacjaWood-frame buildings are very common in regions that are exposed to earthquakes. Most of residential buildings are constructed using this technology; therefore, the seismic resistance of them is really essential in order to prevent human losses and structural damage. The aim of the present article is to show the results of the detailed numerical FEM analysis focused on the seismic behaviour of the wood-frame house with different...
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Pressure-induced flow processing behind the superior mechanical properties and heat-resistance performance of poly(butylene succinate)
PublikacjaWe propose a pressure-induced flow (PIF) processing method for the simultaneous enhancement of strength, toughness, and heat resistance of biodegradable poly(butylene succinate) (PBS). The pressure and temperature were systematically adjusted to optimize the tensile strength of PBS. Under the optimized processing conditions, the structured PBS was characterized by relatively high strength of 89.5 MPa, toughness of 21.4 kJ·m−2 ,...
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Fatigue resistance investigation of the IC engine MB11 bearings, working under conditions of dynamic unidirectional loadings
PublikacjaThe slide bearing material MB11 fatigue resistance has been investigated with the application of SMOK - test stand in which dynamic unidirectional loadings to the test bearing is generated. Slide bearing layer consists of the bronze MB11 ( Cu Pb22 Sn 3 ) sintered to the steel shell. Each of the tested bearing has been subject to the standard 20-hour test, under conditions of the full fluid lubrication. Methodology of the experiments,...
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Antibiotic resistance, virulence, and phylogenetic analysis of Escherichia coli strains isolated from free-living birds in human habitats
PublikacjaWild birds can be colonized by bacteria, which are often resistant to antibiotics and have various virulence profiles. The aim of this study was to analyze antibiotic resistance mechanisms and virulence profiles in relation to the phylogenetic group of E. coli strains that were isolated from the GI tract of wildfowl. Out of 241 faecal samples, presence of E. coli resistant to a cephalosporin (ESBL/AmpC) was estimated for 33 isolates...
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Validation study on a new semi-empirical method for the prediction of added resistance in waves of arbitrary heading in analyzing ship speed trial results
PublikacjaThis paper describes an open and extensive validation study carried out by the Specialist Committee on Ships in Operation at Sea (SOS) of the International Towing Tank Conference (ITTC) on the newly developed SHOPERA-NTUA-NTU-MARIC (SNNM) wave-added resistance prediction method. The SNNM method aims at a simple, fast and transparent determination of the added resistance in regular waves of arbitrary encounter directions, even when...
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Taq DNA polymerase fused with DNA binding protein with increased resistance to inhibitors from clinical samples
PublikacjaNowadays PCR method is commonly used in molecular diagnostic. However, in many cases PCR is limited, by the presence of inhibitory substances in biological, soil or food samples Efficiency and fidelity of amplification is strongly connected with DNA polymerase and reaction conditions. To meet the requirements of modern diagnostic methods it is essential to seeking for new DNA polymerases with better properties useful in these field....
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MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH
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[PP.17.01] INCREASED INSPIRATORY RESISTANCE AFFECTS THE CARDIAC CONTRIBUTION TO THE RELATIONSHIP BETWEEN BLOOD PRESSURE AND PIAL ARTERY PULSATION OSCILLATIONS
PublikacjaThere is increasing evidence that heart performance directly influences cerebral perfusion. We hypothesised that increased inspiratory resistance would affect the cardiac contribution to the relationship between blood pressure and pial artery pulsation oscillations.
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Increased inspiratory resistance affects the dynamic relationship between blood pressure changes and subarachnoid space width oscillations
PublikacjaBackground and objective Respiration is known to affect cerebrospinal fluid (CSF) movement. We hypothesised that increased inspiratory resistance would affect the dynamic relationship between blood pressure (BP) changes and subarachnoid space width (SAS) oscillations. Methods Experiments were performed in a group of 20 healthy volunteers undergoing controlled intermittent Mueller Manoeuvres (the key characteristic of the procedure...
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Influence of Nitriding and Laser Remelting on Properties of Austenitic Stainless Steel Type X10CrNi18-8 and Cavitation Erosion Resistance
PublikacjaThe paper presents properties of surface layers. Surface layers were obtained by using low temperature glow–discharge nitriding process and laser remelting carried out on austenitic stainless steel type X10CrNi18-8. Investigations were done by using an Ultra Nanoindentation Tester (UNHT) in the Warsaw Institute of Fundamental Technological Research. The influence of the above mentioned...
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Virulence analysis and antibiotic resistance of Klebsiella pneumoniae isolates from hospitalised patients in Poland
PublikacjaKlebsiella pneumoniae (KP) is a nosocomial pathogen causing difficult-to-treat infections. The presence of virulence genes and antibiotic resistance of 109 KP isolates from hospitalized patients were investigated. Among them, 68.8% were multi-drug resistant (MDR) and 59.6% produced extended-spectrum beta-lactamases (ESBLs). Metallo-β-lactamases (MBLs) were produced by 22% of isolates (mainly from anus), including 16.5% of isolates...
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HUMAN MUTATION
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Urinary Tract Infections Caused by K. pneumoniae in Kidney Transplant Recipients – Epidemiology, Virulence and Antibiotic Resistance
PublikacjaUrinary tract infections are the most common complication in kidney transplant recipients, possibly resulting in the deterioration of a long-term kidney allograft function and an increased risk of recipient’s death. K. pneumoniae has emerged as one of the most prevalent etiologic agents in the context of recurrent urinary tract infections, especially with multidrug resistant strains. This paper discusses the epidemiology and risk...
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The Influence of Microstructure on the Passive Layer Chemistry and Corrosion Resistance for Some Titanium-Based Alloys
PublikacjaThe effect of microstructure and chemistry on the kinetics of passive layer growth and passivity breakdown of some Ti-based alloys, namely Ti-6Al-4V, Ti-6Al-7Nb and TC21 alloys, was studied. The rate of pitting corrosion was evaluated using cyclic polarization measurements. Chronoamperometry was applied to assess the passive layer growth kinetics and breakdown. Microstructure influence on the uniform corrosion rate of these alloys...
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Morphology and conductivity investigations of nickel-molybdenium alloy by means of Scanning Spreading Resistance Microscopy
Dane BadawczeElectrolytically deposited nickel-molybdenum alloys are interesting materials because of their high corrosion resistance and low over-potential for hydrogen evolution. Despite many studies devoted to the deposition of these alloys, the mechanism of co-deposition is not fully understood [1]. The aim of the research was to preserve the electrochemically...
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Increased inspiratory resistance alters the cardiac contribution to the dynamic relationship between blood pressure and pial artery pulsation oscillations in healthy subjects
PublikacjaThere is increasing evidence that heart performance directly influences cerebral perfusion. We hypothesised that increased inspiratory resistance will affect the cardiac contribution to the relationship between blood pressure and pial artery pulsation oscillations.
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Does Tempo of Resistance Exercise Impact Training Volume?
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Penetration resistance of Lubiatowo sand in calibration chamber tests
PublikacjaAnaliza oporu na wciskanie na stożku sondy statycznej wciskanej na podstawie badań modelowych w komorze kalibracyjnej z kontrolą naprężeń bocznych. Przeprowadzono badania z zastosowaniem standardowej końcówki CPT, dylatometru DMT, mini-stożka CPT oraz pali modelowych o różnej średnicy. Badania wykonano na piasku modelowym z plaży w Lubiatowie w stanie średnio zagęszczonym i zagęszczonym w szerokim zakresie składowej pionowej naprężenia....
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The effect of heat treatment of hardwood on the specific cutting resistance
PublikacjaW pracy przedstawiono wyniki badań mocy skrawania podczas przecierania modyfikowanego i niemodyfikowanego termicznie drewna dębowego i jesionowego na pilarce ramowej PRW15M. W pierwszym etapie badań, graniakowe próbki drewna dębowego i jesionowego były modyfikowane termicznie za pomocą przegrzanej pary (temperatura 197C, czas 4 h) w parzelni wysokotemperaturowej, w warunkach przemysłowych. Następnie, wyznaczono właściwe powierzchniowe...
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The corrosion resistance of laser surface alloyed stainless steels
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The influence of boundary conditions on the resistance and stiffness of rainscreen panels
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High temperature corrosion resistance of porous hastelloy alloy
PublikacjaW pracy przedstawiono badania korozyjne stopu Hastelloy w wysokich temperaturach.
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Resistance to cold cracking of steel joints of P460NL1 steel
PublikacjaPrzedstawiono wyniki badań odporności na zimne pękanie złączy spawanych ze stali przeznaczonej do pracy pod ciśnieniem. Badano równoczesny wpływ zawartości wodoru dyfundującego i energii liniowej na naprężenie krytyczne w próbie implant dla złączy spawanych elektrodami otulonymi i drutem proszkowym w osłonie gazów ochronnych. Stwierdzono wpływ energii liniowej jak i zawartości wodoru dyfundującego na odporność na zimne pękanie...
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Silicone pressure-sensitive adhesives with increased thermal resistance
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Special Issue “Corrosion Resistance of Alloy and Coating Materials”
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Cement composites with expanded graphite as resistance heating elements
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On accurracy of polarization resistance estimation by electrochemical noise measurements
PublikacjaPrzedstawiono sposób estymacji rezystancji polaryzacji, wykorzystywanej do oceny szybkości procesów korozji. Zaproponowano formułę określającą błąd losowy estymacji rezystancji polaryzacji. Przytoczono i przedyskutowano eksperymentalne wyniki estymacji rezystancji polaryzacji na podstawie pomiarów szumów elektrochemicznych w układzie trzech elektrod pomiarowych.
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Gas sensing by resistance fluctuations in PdxWO3 nanoparticle films.
PublikacjaPrzedstawiono wyniki badań sensorów gazu wykonanych z nanocząstek WO3 z dodatkiem Pd. Stwierdzono, że badanie fluktuacji rezystancji tych sensorów może istotnie zwiększyć czułość wykrywania gazu w porównaniu z obserwacją wyłącznie rezystancji stałoprądowej.
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Mathematical description and evaluation of cavitation erosion resistance of materials.
PublikacjaPrzedstawiono matematyczny opis erozji kawitacyjnej materiałów. Model opisuje wpływ własności mechanicznych materiału takich jak: względna odporność na plastyczne odkształcanie powierzchni a także współczynnika intensywności naprężeń wzmocnionej warstwy wierzchniej na przebieg erozji kawitacyjnej. Zaproponowano również nowy współczynnik opisujący ilościowo odporność kawitacyjną materiałów jako funkcję czasu inkubacji maksymalnej...
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Mathematical description and evaluation of cavitation erosion resistance of materials.
PublikacjaW pracy przedstawiono matematyczny model opisujący erozję kawitacyjną materiałów oparty o rozkład prawdopodobieństwa Weibulla. Model oposuje wpływ własności mechanicznych materiału na przebieg krzywych erozji kawitacyjnej.
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Problems of gas detection by resistance fluctuations in gas sensors
PublikacjaPrzedstawiono problemy budowy dystrybutora gazów oraz próbek zapachowych do badań sensorów gazu. Podano układ elektroniczny wykorzystywany do rejestracji fluktuacji rezystancji obserwowany w czujnikach gazu. Załączono przykładowe wyniki obserwacji sygnałów losowych.
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A study of cavitation erosion resistance of an ion nitrided titanium alloy by means of the vibration and rotating disk methods
PublikacjaIn this work, a comparative analysis of the cavitation erosion resistance of the Ti– 6.7Al–2.5Mo–1.8Cr–0.5Fe–0.25Si alloy (known as brand VT3-1) before and after lowtemperature ion nitriding is carried out. Two test methods were applied, using vibrative (ASTM G-32) and rotating disk rigs, respectively. The kinetic dependences of the erosive destruction of samples of titanium alloy VT3-1 in the initial state, after ion nitriding...
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TIME-DOMAIN NUMERICAL EVALUATION OF SHIP RESISTANCE AND MOTION IN REGULAR WAVES BY USING THE CFD URANS METHOD
PublikacjaTaking into account the International Maritime Organization's (IMO) strategy to radically reduce the...
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The scanning spreading resistance microscopy (SSRM) of some CoCrMo alloys subjected to electrochemical litography
Dane BadawczeThe dataset contains the results of the experiment consisting of performing electrochemical lithography on the surface of the CoCrMo prosthetic alloy. First, by applying local anodic polarization, oxide structures were created on the surface of the material. Next, they were imaged in the SSRM (scanning spreading resistance microscopy) mode to visualize...
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Thermal stabilization and permanent deformation resistance of LWA/PCM-modified asphalt road surfaces
PublikacjaThis paper presents the results of attempts at reducing the problem of solar overheating of asphalt road pavement surfaces, resulting in weakening and accelerated destruction of the aforementioned structures. To protect pavement surfaces against periodic overheating, standard asphalt mixture AC 16 W 35/50, used for binder course, has been modified by replacing one of the aggregate fractions from the mineral mixture with lightweight...
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Experimental analysis of wear resistance of compacts of fine-dispersed iron powder and tungsten monocarbide nanopowder produced by impulse pressing
PublikacjaThe paper presents the results of studying the structure and wear resistance of compacts produced from fine dispersed reduced iron powder (average particle size 3–mu m) with the addition of tungsten carbide (WC) nanopowder with the average particle size of 25–30 nm. The mass fraction of tungsten carbide (wolfram carbide) in the powder composition was 5% and 10% of the total mass. Impulse pressing was conducted using the modified...
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Oxygen partial pressure and temperature dependence of series resistance of symmetrical porous Sr0.86Ti0.65Fe0.35O3 electrode on CGO substrate
Dane BadawczeThis dataset contains values of series resistance (R) at different temperatures (800 °C, 750 °C, 700 °C, 650 °C and 600 °C) and oxygen partial pressures (20%, 10%, 5%, 1%, 0.1% and 0.01% pO2) of symmetrical Sr0.86Ti0.65Fe0.35O3 electrode sintered at 1000 °C. This values were obtained by fitting each measured impedance spectra by electrical equivalent...
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Influence of process of straightening ship hull structure made of 316L stainless steel on corrosion resistance and mechanical properties
PublikacjaThe AISI 316L type steel belongs to the group of chromium-nickel stainless steels. They are determined according to European standards as X2CrNiMo17-12-2 and belong to the group of austenitic stainless steels. Steels of this group are used for elements working in seawater environments, for installations in the chemical, paper, and food, industries, for architectural elements, and many others. The chemical composition of corrosion-resistant...
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Antimicrobial resistance of fecal indicators in municipal wastewater treatment plant
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Specific cutting resistance while sawing of wood - the size effect
PublikacjaW artykule przedstawiono wyniki analiz zmian właściwego oporu skrawania, przy zastosowaniu współczesnej mechaniki pękania z uwzględnieniem wiązkości. Analizy wykonano dla procesu przecinania drewna na pilarce ramowej PRW15M drewna jesionu i jesionu modyfikowanego termicznie. Zastosowane podejście pozwala na wyjaśnienie zjawiska wzrostu właściwego powierzchniowego oporu skrawania dla niewielkich grubości warstwy skrawanej jako efektu...
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Resistance of Polypropylene Membrane to Oil Fouling during Membrane Distillation
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