Temat: test sensitivity - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Metoda wyznaczania strefy czułości sensorów TDR
Method for the determination of the sensitivity zone of TDR probe
Autorzy:: Janik, G.
Szpila, M.
Slowinska, J.
Brej, G.
Turkiewicz, M.
Skierucha, W.
Pastuszka, T.
Powiązania:: https://bibliotekanauki.pl/articles/36972.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: pomiary wilgotnosci
sensory TDR
metoda TDR
czulosc testow
gleby
moisture measurement
time domain reflectometry technique
test sensitivity
soil
Opis:: W niniejszej pracy przedstawiono metodę wyznaczania strefy czułości sensorów stosowanych do pomiaru wilgotności objętościowej w ośrodkach porowatych. Analizom poddano czujniki wykorzystujące reflektometrię domenowo czasową (TDR), wyprodukowane w Instytucie Agrofizyki Polskiej Akademii Nauk w Lublinie. Na podstawie przeprowadzonych badań laboratoryjnych stwierdzono, że zasięg strefy czułości sensorów typu laboratoryjnego i polowego jest zależny od zawartości wody w ośrodku, w którym prowadzone są pomiary. W przypadku czujnika laboratoryjnego (LP/ms), gdy oznaczenia prowadzone są w glebie całkowicie suchej, strefę czułości stanowi objętość prostopadłościanu o wymiarach 0,6 cm i 5,8 cm i grubości równej średnicy prętów sondy LP. Natomiast gdy gleba jest nasycona to strefę czułości stanowi walec eliptyczny o wysokości 5,5 cm i promieniach 0,5 cm i 0,8 cm. W przypadku czujnika polowego (FP/mts), gdy pomiary prowadzone są w glebie całkowicie suchej, strefę czułości stanowi walec eliptyczny o wysokości 10,2 cm i promieniach 0,3 cm i 0,4 cm. Natomiast gdy gleba jest nasycona wodą walec o wysokości 11,2 cm i podstawie koła o promieniu 1,7 cm.
The paper presents a method for the determination of the zone of sensitivity of probes used for the measurement of volumetric moisture in porous media. The probes under analysis were TDR (Time-Domain Reflectometry) probes manufactured at the Institute of Agrophysics, Polish Academy of Sciences, Lublin. Based on the laboratory studies performed it was found that the extent of the sensitivity zone of the field- and laboratory-type probes depends on the water content of the medium in which measurements are conducted. In the case of the laboratory probe (LP/ms), when the measurements are conducted in a completely dry soil, the zone of sensitivity of the probe is the volume of a cuboid with dimensions of 0.6 cm by 5.8 cm and a thickness equal to the diameter of the rods of the LP probe. Whereas, when the soil is saturated with water the zone of sensitivity of the probe is an elliptical cylinder with height of 5.5 cm and radii of 0.5 cm and 0.8 cm. In the case of the field probe (FP/mts), when the measurements are conducted in a completely dry soil, the probe sensitivity zone is an elliptical cylinder with height of 10.2 cm and radii of 0.3 cm and 0.4 cm. Whereas, when the soil is saturated with water that zone is a cylinder with height of 11.2 cm and a circular base with a radius of 1.7 cm.
Źródło:: Acta Agrophysica; 2011, 18, 2[193]
1234-4125
Pojawia się w:: Acta Agrophysica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: An attempt to determine the effect of increase of observation correlations on detectability and identifiability of a single gross error
Autorzy:: Prószyński, W.
Kwaśniak, M.
Powiązania:: https://bibliotekanauki.pl/articles/145479.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: sieć GPS
sieć geodezyjna
system nawigacji
single outlier case
correlated observations
detectability
identifiability
outlier-test sensitivity
mean-shift model
Opis:: The paper presents the results of investigating the effect of increase of observation correlations on detectability and identifiability of a single gross error, the outlier test sensitivity and also the response-based measures of internal reliability of networks. To reduce in a research a practically incomputable number of possible test options when considering all the non-diagonal elements of the correlation matrix as variables, its simplest representation was used being a matrix with all non-diagonal elements of equal values, termed uniform correlation. By raising the common correlation value incrementally, a sequence of matrix configurations could be obtained corresponding to the increasing level of observation correlations. For each of the measures characterizing the above mentioned features of network reliability the effect is presented in a diagram form as a function of the increasing level of observation correlations. The influence of observation correlations on sensitivity of the w-test for correlated observations (Förstner 1983, Teunissen 2006) is investigated in comparison with the original Baarda’s w-test designated for uncorrelated observations, to determine the character of expected sensitivity degradation of the latter when used for correlated observations. The correlation effects obtained for different reliability measures exhibit mutual consistency in a satisfactory extent. As a by-product of the analyses, a simple formula valid for any arbitrary correlation matrix is proposed for transforming the Baarda’s w-test statistics into the w-test statistics for correlated observations.
Źródło:: Geodesy and Cartography; 2016, 65, 2; 313-333
2080-6736
2300-2581
Pojawia się w:: Geodesy and Cartography
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Dokładność oceny w badaniach ultradźwiękowych złączy spawanych techniką DGS
Accuracy of assessment in ultrasonic testing of DGS welded joints
Autorzy:: Krawczyk, Ryszard
Wojtas, Piotr
Powiązania:: https://bibliotekanauki.pl/articles/107908.pdf
Data publikacji:: 2019
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: ultrasonic tests
DGS technique
test sensitivity
accuracy of assessment
welded joints
badania ultradźwiękowe
technika DGS
czułość badania
dokładność oceny
złącza spawane
Opis:: The analysis presented in the study was to determine the accuracy in the assessment system used when testing welded joints using the ultrasonic method using the DGS technique. An attempt was made to determine the DDSR reference reflector as a function of the thickness of the tested material. The designated reflector allowed the assessment of sensitivity of reference reflectors adopted according to PN-EN ISO 17640.
Przedstawiona w opracowaniu analiza miała na celu określenie dokładności w systemie oceny stosowanym przy badaniu złączy spawanych metodą ultradźwiękową z zastosowaniem techniki DGS. Podjęto próbę wyznaczenia reflektora odniesienia DDSR jako funkcji grubości badanego materiału. Wyznaczony reflektor pozwolił na ocenę czułości reflektorów odniesienia przyjętych wg normy PN-EN ISO 17640.
Źródło:: Badania Nieniszczące i Diagnostyka; 2019, 4; 23-25
2451-4462
2543-7755
Pojawia się w:: Badania Nieniszczące i Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A study of the influence of selected transition metals on the solid state Reactivity in a Fe-KClO4 mixture
Autorzy:: Czajka, B.
Foltynowicz, Z.
Wachowski, L.
Powiązania:: https://bibliotekanauki.pl/articles/358387.pdf
Data publikacji:: 2014
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: Fe-KClO4 mixture
activators
linear burn rate
electrostatic discharge sensitivity test (EDS)
calorimetric measurements
oxygen conversion
Opis:: The effect of selected transition metal powders (Zn, Ti, Mo and nano-Fe), in the concentration range from 0-5 wt.%, when used as activators in the highly calorific mixture Fe-KClO4 (containing 16 wt.% KClO4), has been studied. It has been established that zinc and molybdenum powders can act as factors in decreasing the activation temperature and increasing the effectiveness of the oxidant used. Titanium powder increases the oxygen conversion rate and the amount of energy released. Iron nano-powder has only a slight influence on the above mentioned parameters.
Źródło:: Central European Journal of Energetic Materials; 2014, 11, 2; 271-283
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Studies on Sensitivity of Nitrate Ester Plasticized Hydroxyl Terminated Prepolymer Based Energetic Solid Rocket Propellants
Autorzy:: Bhowmik, D.
Sadavarte, V. S.
Charbhe, V. D.
Pande, S. M.
Powiązania:: https://bibliotekanauki.pl/articles/358663.pdf
Data publikacji:: 2017
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: sensitivity
impact
friction
card gap test
DDT test
SLSG test
Opis:: The sensitivities of energetic materials as well as advanced energetic solid propellants are invariably associated with the nature of the stimuli that are responsible for the initiation of their decomposition. Hence it is important to study the chemical processes involved with these decompositions. While assessing the potential application of new propellant formulations containing energetic materials, it is important to assess their sensitivity to the hazards involved during their handling, transport, storage and use. This paper reports the results of impact, friction, heat, spark and shock sensitivities of advanced high energy solid rocket propellant formulations based on nitrate ester plasticized, hydroxyl terminated prepolymer (SPB-255) as an energetic binder loaded with solid ingredients like ammonium perchlorate (AP), aluminium (Al) and cyclotetramethylenetetranitramine (HMX). The results of the small card gap test showed that they are more sensitive than a composite modified double base (CMDB) propellant, which in turn is more sensitive than double base (DB) as well as composite propellants. Deflagration to detonation transition (DDT) tests carried out for the advanced energetic propellant did not show any detonation phenomena. Trinitrotoluene (TNT) equivalence and super large scale gap (SLSG) tests have been carried out for the determination of hazard classification of the energetic solid rocket propellant. The requirements to achieve both higher performance in terms of improved energy (i.e., specific impulse, Isp) and reduced sensitivity for the same propellant composition are contradictory; one should be sacrificed for the other, within manageable limits.
Źródło:: Central European Journal of Energetic Materials; 2017, 14, 3; 605-620
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Concerning the Shock Sensitivities of Certain Plastic Bonded Explosives Based on Attractive Cyclic Nitramines
Autorzy:: Zeman, S.
Elbeih, A. E.
Hussein, A.
Elshenawy, T.
Pelikán, V.
Yan, Q-L.
Powiązania:: https://bibliotekanauki.pl/articles/358824.pdf
Data publikacji:: 2017
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: nitramines
gap test
PBX
sensitivity
performance
Opis:: Plastic bonded explosives (PBXs) based on ε-2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (ε-HNIW), 1,3,5-trinitro-1,3,5-triazinane (RDX), β-1,3,5,7-tetranitro-1,3,5,7-tetrazocane (β-HMX) and cis-1,3,4,6-tetranitro-octahydroimidazo-[4,5-d]imidazole (BCHMX) were prepared using a hydroxyl-terminated polybutadiene as a binder (HTPB) and cured with hexamethylene di-isocyanate (HMDI). Recently published data for analogous PBXs with a polyisobutylene binder (i.e. a C4 matrix) are also included. All of these PBXs were tested using the Small Scale Water Gap Test according to STANAG 4490, the results of which are directly proportional to the impact and friction sensitivities of the PBXs studied. Reciprocal ratios between the shock sensitivity of these PBXs and their performance were found using the volume heat of explosion as a variable; a semi-logarithmic analogue, using a representative of the detonation pressure (product ρD2) as a variable, has shown an opposite trend for three of these PBXs. A semi-logarithmic relationship between the shock sensitivity of the PBXs and the impact sensitivity of their pure nitramine fillers has confirmed the higher shock reactivity of the C4 PBXs filled with both technical ε-HNIW and RS-ε-HNIW, while for the HTPB PBXs filled with technical grade ε-HNIW, the shock sensitivity found was as expected. The shape and size of the particles should not be a reason for the increased resistance to shock of HMX-C4.
Źródło:: Central European Journal of Energetic Materials; 2017, 14, 4; 775-787
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Sensitivity Analysis of the Nasgro Equation Based on the PZL-130 TC-II Orlik Trainer Aircraft Full Scale Fatigue Test
Autorzy:: Reymer, Piotr
Leski, Andrzej
Kurdelski, Marcin
Powiązania:: https://bibliotekanauki.pl/articles/24201173.pdf
Data publikacji:: 2022
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:: sensitivity analysis
crack propagation
full scale fatigue test
Opis:: The study investigates the sensitivity of numerical crack propagation estimations based on the Nasgro equation. The equation is widely used for crack propagation calculations since it considers the whole range of crack propagation speed from threshold to critical values of stress intensity factor range (∆K). The presented investigation is based on the actual results of the full scale fatigue test (FSFT) of the PZL-130 ‘Orlik’ TC-II aircraft. We provide a brief description of the test and the general approach followed in crack propagation estimations originally carried out after the test. The obtained results are verified in terms of variation of the input data. Overall results are compared and discussed.
Źródło:: Fatigue of Aircraft Structures; 2022, 14; 8--17
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Determination of Ignition Sensitivity of Selected Heat Powders
Autorzy:: Czajka, B.
Styczyński, S.
Tabat, S.
Szal, D.
Wachowski, L.
Powiązania:: https://bibliotekanauki.pl/articles/357966.pdf
Data publikacji:: 2011
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: heat powder
ignition sensitivity
Fe-KClO4
EDS test
Opis:: Ignition sensitivity is one of the factors defning the characteristics of high calorifc mixture with low emission of gaseous product. It was found that Zr-BaCrO4 mixture is sensitive to ignition by electric spark energy of 0.82 J, whereas activation of Fe-KClO4 mixture depends on the iron powder employed and the composition of its surface oxide layers. Energy required for the activation of high calorifc mixture in form of powder designated as FeK, FeR or FeE is equal to 0.08, 0.59 and 1.1 J, while in the form of pellet 6.92, 10.2 and 14.1 J. Activation of Fe-KClO4 mixture with a strip of heat paper as well as with the electric spark has revealed that the mixture containing iron powder obtained by atomization method (FeA) is not active.
Źródło:: Central European Journal of Energetic Materials; 2011, 8, 1; 3-13
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Robustness of randomisation tests as alternative analysis methods for repeated measures design
Autorzy:: Oladugba, Abimibola Victoria
Obasi, Ajali John
Asogwa, Oluchukwu Chukwuemeka
Powiązania:: https://bibliotekanauki.pl/articles/2156968.pdf
Data publikacji:: 2022-12-15
Wydawca:: Główny Urząd Statystyczny
Tematy:: randomisation test
repeated measures design
sensitivity
robustness
Monte Carlo
Opis:: Randomisation tests (R-tests) are regularly proposed as an alternative method of hypothesis testing when assumptions of classical statistical methods are violated in data analysis. In this paper, the robustness in terms of the type-I-error and the power of the R-test were evaluated and compared with that of the F-test in the analysis of a single factor repeated measures design. The study took into account normal and non-normal data (skewed: exponential, lognormal, Chi-squared, and Weibull distributions), the presence and lack of outliers, and a situation in which the sphericity assumption was met or not under varied sample sizes and number of treatments. The Monte Carlo approach was used in the simulation study. The results showed that when the data were normal, the R-test was approximately as sensitive and robust as the F-test, while being more sensitive than the F-test when data had skewed distributions. The R-test was more sensitive and robust than the F-test in the presence of an outlier. When the sphericity assumption was met, both the R-test and the F-test were approximately equally sensitive, whereas the R-test was more sensitive and robust than the F-test when the sphericity assumption was not met.
Źródło:: Statistics in Transition new series; 2022, 23, 4; 77-90
1234-7655
Pojawia się w:: Statistics in Transition new series
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Sensitivity analysis of the dem model numerical parameters on the value of the angle of repose of lunar regolith analogs
Autorzy:: Młynarczyk, Przemysław
Kolusz, Adam
Gallina, Alberto
Powiązania:: https://bibliotekanauki.pl/articles/27314470.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Centrum Badań Kosmicznych PAN
Tematy:: DEM
regolith
space mining
repose angle test
sensitivity analysis
Opis:: The discrete element method (DEM) is a numerical technique used in many areas of modern science to describe the behavior of bulk materials. Terramechanics of planetary soil analogs for in situ resource utilization activities is a research field where the use of DEM appears to be beneficial. Indeed, the close-to-physics modeling approach of DEM allows the researcher to gain much insight into the mechanical behavior of the regolith when it interacts with external devices in conditions that are hard to test experimentally. Nevertheless, DEM models are very difficult to calibrate due to their high complexity. In this paper, we study the influence of fundamental model parameters on specific simulation outcomes. We provide qualitative and quantitative assessments of the influence of DEM model parameters on the simulated repose angle and computational time. These results help to understand the behavior of the numerical model and are useful in the model calibration process.
Źródło:: Artificial Satellites. Journal of Planetary Geodesy; 2023, 58, Special Issue 1; 188--202
2083-6104
Pojawia się w:: Artificial Satellites. Journal of Planetary Geodesy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Przykład zastosowania analizy wrażliwości w diagnostyce maszyn
Example of application of sensitivity analysis in the technical diagnostics
Autorzy:: Sławik, D.
Powiązania:: https://bibliotekanauki.pl/articles/327456.pdf
Data publikacji:: 2004
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: wrażliwość diagnostyczna
analiza wariancji
test HSD
miara wrażliwości
diagnostic sensivity
variance analysis
HSD test
sensitivity measure
Opis:: Obecnie w systemach nadzoru maszyn często monitorowanych jest wiele cech sygnałów diagnostycznych. Wybierane są one na podstawie wiedzy i intuicji projektanta, a nie w wyniku sformalizowanego procesu optymalizacji. Wiąże się to z tym, iż wybór cech sygnałów jest jednym z najtrudniejszych zadań diagnostyki. Mając na celu automatyzację tego zadania opracowano metodę badania wrażliwości cech sygnałów diagnostycznych. Przedstawiona w referacie metoda pozwala na wybór z dostępnego zbioru cech sygnałów pewnego podzbioru cech, istotnego z punktu widzenia diagnostyki maszyn. Otrzymany podzbiór cech ma zapewnić wysoką jakość rozpoznawania stanu technicznego diagnozowanego obiektu.
Nowadays, features of diagnostic signals are very often determined in maintenance systems. They are not usually chosen as a result of formalized optimization process, but they are based on knowledge and intuition of a designer. It is an effect of a fact that selection of signal features is one of the most difficult tasks of technical diagnostics. A method of sensitivity examination of di-agnostic signal features was developed for the needs of automation of this task. The method de-scribed in the paper makes it possible to select a certain subset of signal features, which are meaningful from the diagnostic point of view. They are selected from a set of signal features. An obtained subset should assure height quality of technical state classification of an examined object.
Źródło:: Diagnostyka; 2004, 30, T. 2; 101-104
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Multinomial Logistic Regression Approach For The Evaluation Of Binary Diagnostic Test In Medical Research
Autorzy:: Dwivedi, Alok Kumar
Mallawaarachchi, Indika
Figueroa-Casas, Juan B.
Powiązania:: https://bibliotekanauki.pl/articles/465774.pdf
Data publikacji:: 2015
Wydawca:: Główny Urząd Statystyczny
Tematy:: multinomial logistic regression predictive values
sensitivity, specificity
acute appendicitis
pulmonary abnormalities
medical diagnostic test
Opis:: Evaluating the effect of variables on diagnostic measures (sensitivity, specificity, positive, and negative predictive values) is often of interest to clinical researchers. Logistic regression (LR) models can be used to predict diagnostic measures of a screening test. A marginal model framework using generalized estimating equation (GEE) with logit/log link can be used to compare the diagnostic measures between two or more screening tests. These individual modeling approaches to each diagnostic measure ignore the dependency among these measures that might affect the association of covariates with each diagnostic measure. The diagnostic measures are computed using joint distribution of screening test result and reference test result which generates a multinomial response data. Thus, multinomial logistic regression (MLR) is a more appropriate approach to modeling these diagnostic measures. In this study, the validity of LR and GEE approaches as compared to MLR model was assessed for modeling diagnostic measures. All methods provided unbiased estimates of diagnostic measures in the absence of any covariate. LR and GEE methods produced more biased estimates as compared to MLR approach especially for small sample size studies. No bias was obtained in predicting sensitivity measure using MLR method for one screening test. Our proposed MLR method is robust for modeling diagnostic measures of a screening test as opposed to LR method. MLR method and GEE method produced similar estimates of diagnostic measures for comparing two screening tests in large sample size studies. The proposed MLR model for diagnostic measures is simple, and available in common statistical software. Our study demonstrates that MLR method should be preferred as an alternative for modeling diagnostic measures.
Źródło:: Statistics in Transition new series; 2015, 16, 2; 203-222
1234-7655
Pojawia się w:: Statistics in Transition new series
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Wykorzystanie testów płytkowych do oceny oddziaływania leków przeciwinfekcyjnych na wybrane biocenozy
The use of platelets tests to assess the effect of anti-infectives on the selectes biocenosis
Autorzy:: Adamek, E.
Baran, W.
Adamczyk, R.
Szymkiewicz, A.
Wilk, J.
Zielińska-Danch, W.
Powiązania:: https://bibliotekanauki.pl/articles/127473.pdf
Data publikacji:: 2018
Wydawca:: Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:: antybiotyki
środowisko
ekotoksyczność
testy toksyczności
wrażliwość mikroorganizmów
antibiotics
environment
ecotoxicity
toxicity test
microorganisms’ sensitivity
Opis:: Leki przeciwinfekcyjne wprowadzane do środowiska mogą spowodować znaczące zmiany w mikrobiocenozach oraz zachodzących w nich procesach troficznych. Zapobieganie tym zmianom jest łatwiejsze, gdy potrafimy je szybko zdiagnozować. Celem pracy były badania nad wykorzystaniem testów wykonywanych na płytkach 96-dołkowych do oceny skutków oddziaływania tych leków na wybrane biocenozy. Do pożywki wykorzystywanej w testach dodawano jednego z wytypowanych do badań leków przeciwinfekcyjnych, zaliczanych do różnych grup zgodnie z klasyfikacją anatomiczno-terapeutyczno-chemiczną. Inokulum stanowiła woda pobrana z siedmiu ekosystemów naturalnych i sztucznych znacznie różniących się stężeniem węgla organicznego. Oceny rezultatów dokonywano po 24 i 48 godzinach inkubacji. Stwierdzono, że zastosowana procedura pozwala na obserwację reakcji mikroorganizmów na badane leki oraz na wyznaczenie granicy wrażliwości tych mikroorganizmów. Możliwa była również ocena zdolności adaptacyjnych badanej mikrobicenozy. Zaletą badanej metody jest uzyskiwana względnie szybko duża ilość informacji (na 1 płytce testowej można wykonać 11 oznaczeń). Poza tym cała procedura nie jest kosztowna, nie wymaga stosowania drogiej, specjalistycznej aparatury. Jednak jej stosowalność jest ograniczona do próbek o wystarczającej frekwencji mikroorganizmów.
The anti-infective drugs, which are released into the environment, can cause significant changes in the micro-biocenoses and in the trophic processes taking place in them. Prevention of these negative changes is easier when we can diagnose these changes quickly. The aim of the study was to investigate the use of tests performed on 96-well plates to assess the effects of anti-infective drugs on the selected biocenosis. Each drug was added to the growth medium (phytone peptone solution). The used drugs belonged to different groups according to the Anatomical Therapeutic Chemical classification. Water samples were collected from seven ecosystems (natural and artificial). These samples significantly differed in organic carbon concentration and were used as an inoculum. The results assessment was carried out after 24 and 48 hours of incubation. The procedure used allows the observation of microorganisms’ behaviour in response to the influence of antimicrobial drugs and the determination of sensitivity limit for the microorganisms. It was possible to assess the adaptability of each micro-bicenosis. The main advantage of the method was the obtaining of information quickly (even 11 determinations on 1 test plate). Additionally, the whole procedure is not expensive and it does not require a specialized equipment. However, its applicability is limited to the environmental samples containing a sufficient frequency of microorganisms.
Źródło:: Proceedings of ECOpole; 2018, 12, 1; 107-115
1898-617X
2084-4557
Pojawia się w:: Proceedings of ECOpole
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Testing metals in tension and relaxation at elevated temperatures
Autorzy:: Darrieulat, M.
Aoufi, A.
Desrayaud, CH.
Powiązania:: https://bibliotekanauki.pl/articles/38695715.pdf
Data publikacji:: 2023
Wydawca:: Instytut Podstawowych Problemów Techniki PAN
Tematy:: tension testing
viscoplasticity
work hardening
engineering strain
extensometer
relaxation test
strain rate sensitivity
elevated temperature
Opis:: This article describes an apparatus for testing viscoplastic metallic alloys in tension at temperatures up to 400ºC. Its distinctive feature is a two-shelled furnace which encompasses the test-piece. The extensometer is attached to the shoulders of the specimen and remains outside the oven, so that it works at room temperature. The strain εrs in the reduced section inside the tight fitting oven is calculated with the help of a finite element software from the strain εext given by the extensometer. In the elastic range, the set-up was used for the measurement of Young’s moduli. In the plastic and viscoplastic ranges, it was used to draw work-hardening curves and to perform relaxation tests representative of in-service conditions. In this later case, a method to derive the strain rate sensitivity from the decrease with time of the registered stress is presented. The furnace can be easily machined in a mechanical workshop for all shapes and dimensions of test-pieces, so that it can be adapted to various studies of the workability of metallic alloys, especially those which necessitate a rapid rise and precise maintenance in temperature.
Źródło:: Archives of Mechanics; 2023, 75, 1-2; 75-106
0373-2029
Pojawia się w:: Archives of Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Provocative tests used in the diagnosis of carpal tunnel syndrome
Testy prowokacyjne stosowane w diagnostyce zespołu cieśni nadgarstka
Autorzy:: Georgiew, Filip
Powiązania:: https://bibliotekanauki.pl/articles/1938585.pdf
Data publikacji:: 2007
Wydawca:: Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
Tematy:: Carpal Tunnel Syndrome
Diagnosis
Provocative Test
Sensitivity
Specificity
zespół ciesni nadgarstka
diagnostyka
testy prowokacyjne
czułosc
specyficznosc
Opis:: The carpal tunnel syndrome (CTS) is the most often diagnosed compressive neuropathy of the upper limb. As a result of the changes within the tunnel of the median nerve, the disease is associated with hypersensitivity to some external factors such as: an increase in pressure within the carpal tunnel, direct or indirect pressure on the wrist level, hypoxia. These factors are used in provocative tests. The aim of this article is to make a distinction between functional test’s classifications used in the CTS diagnosis, depending on the method of ailment provocation. Different modifications used in common tests and their average sensitivity and specificity are also presented. Carpal tunnel syndrome should be diagnosed clinically; although electro-diagnostic studies are a standard method of establishing the diagnosis, they do have limitations. Clinical diagnostic skill must be reinforced by a valuable provocative test: the Provocative Test, the Phalen test + mCCT, Tinel’s sign, Phalen’s and reverse Phalen’s test, Durkan Carpal Compression Test (mCCT). There are also tests, which, due to their low sensitivity and specificity, be not applied in the CTS diagnostics. Provocative tests are more easily performed than electro-diagnostic studies and are the most appropriate diagnostic tools in the ambulatory setting. Provocative tests are commonly needed for establishing the diagnosis for treatment, screening and determining aetiology. To improve the efficiency of provocative tests, we should apply univocal standards for their performance and interpretation. A combination of tests might be more powerful than a single test in establishing the diagnosis. Taking medical history and performing physical examination should be the primary methods of diagnosing CTS. The combination of hand diagram, questionnaires, abnormal sensibility and positive provocative tests will provide a diagnostic tool for CTS with high sensitivity and specificity. The addition of nerve conduction studies is unnecessary in most cases.
Źródło:: Medical Rehabilitation; 2007, 11(4); 15-25
1427-9622
1896-3250
Pojawia się w:: Medical Rehabilitation
Dostawca treści:: Biblioteka Nauki

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