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Wyświetlanie 1-15 z 53
Tytuł:
Analysis of SQL Injection Detection Techniques
Autorzy:
Singh, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/375681.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SQL Injection
runtime monitoring
Static Analysis
Opis:
SQL Injection is one of the vulnerabilities in OWASP's Top Ten List forWeb Based Application Exploitation. These type of attacks take place on Dynamic Web applications as they interact with databases for various operations. Current Content Management System like Drupal, Joomla or Wordpress have all information stored in their databases. A single intrusion into these type of websites can lead to overall control of websites by an attacker. Researchers are aware of basic SQL Injection attacks, but there are numerous SQL Injection attacks which are yet to be prevented and detected. Over here, we present the extensive review for the Advanced SQL Injection attack such as Fast Flux SQL Injection, Compounded SQL Injection and Deep Blind SQL Injection. We also analyze the detection and prevention using the classical methods as well as modern approaches. We will be discussing the Comparative Evaluation for prevention of SQL Injection.
Źródło:
Theoretical and Applied Informatics; 2016, 28, 1-2; 37-55
1896-5334
Pojawia się w:
Theoretical and Applied Informatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of a static expansion standard for calibrating medium and high vacuum pressure gauges
Autorzy:
Duarte Franco, Jonathan Javier
Villamizar Mora, Carlos Mauricio
García Sánchez, Carlos Eduardo
Powiązania:
https://bibliotekanauki.pl/articles/1848994.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
static expansion system
calibration
vacuum
characterization
Opis:
The Centro de Desarrollo Tecnológico del Gas developed a static expansion system to enable the calibration of medium and high vacuum pressure gauges in Colombia. The system can generate pressures between 0.1 Pa and 100 kPa. The characterization tests included the evaluation of pressure stability and desorption rate, a trueness test, and the analysis of the uncertainty budget of the calibration result. The pressure stability test was successfully completed and showed the positive effect of baking on the final pressure in the system. The trueness test allowed concluding that the calibration results with the system are comparable with those obtained with a reference meter traceable to a national metrology institute. The uncertainty budget analysis indicated the dominance of the pressure of the unit under calibration and of the initial pressure in the small tank in different pressure ranges on the uncertainty of the result. A comparison with a Monte Carlo simulation led to the conclusion that in this situation, the GUM (Guide to the Expression of Uncertainty in Measurement) method is not ideal for estimating the uncertainty of the results.
Źródło:
Metrology and Measurement Systems; 2021, 28, 3; 593-604
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some quantitative evaluations on finite difference local and global results
Autorzy:
Costamagna, E.
Powiązania:
https://bibliotekanauki.pl/articles/140996.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
finite differences
Schwarz-Christoffel
static fields
Opis:
Refined Schwarz-Christoffel (SC) conformal transformations allow us to perform reliable quantitative evaluation of the accuracy of local computation of electric and magnetic fields with limited effort, which can be useful to complement well known comparisons of global results. In this paper some examples are presented for mesh point potentials obtained by means of finite difference (FD) methods, but it is possible that similar considerations will be useful in the case of finite element methods (FEM) or meshless computations too.
Źródło:
Archives of Electrical Engineering; 2016, 65, 2; 263-272
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of a static expansion standard for calibrating medium and high vacuum pressure gauges
Autorzy:
Duarte Franco, Jonathan Javier
Villamizar Mora, Carlos Mauricio
García Sánchez, Carlos Eduardo
Powiązania:
https://bibliotekanauki.pl/articles/1849022.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
static expansion system
calibration
vacuum
characterization
Opis:
The Centro de Desarrollo Tecnológico del Gas developed a static expansion system to enable the calibration of medium and high vacuum pressure gauges in Colombia. The system can generate pressures between 0.1 Pa and 100 kPa. The characterization tests included the evaluation of pressure stability and desorption rate, a trueness test, and the analysis of the uncertainty budget of the calibration result. The pressure stability test was successfully completed and showed the positive effect of baking on the final pressure in the system. The trueness test allowed concluding that the calibration results with the system are comparable with those obtained with a reference meter traceable to a national metrology institute. The uncertainty budget analysis indicated the dominance of the pressure of the unit under calibration and of the initial pressure in the small tank in different pressure ranges on the uncertainty of the result. A comparison with a Monte Carlo simulation led to the conclusion that in this situation, the GUM (Guide to the Expression of Uncertainty in Measurement) method is not ideal for estimating the uncertainty of the results.
Źródło:
Metrology and Measurement Systems; 2021, 28, 3; 593-604
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of a static expansion standard for calibrating medium and high vacuum pressure gauges
Autorzy:
Duarte Franco, Jonathan Javier
Villamizar Mora, Carlos Mauricio
García Sánchez, Carlos Eduardo
Powiązania:
https://bibliotekanauki.pl/articles/1849054.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
static expansion system
calibration
vacuum
characterization
Opis:
The Centro de Desarrollo Tecnológico del Gas developed a static expansion system to enable the calibration of medium and high vacuum pressure gauges in Colombia. The system can generate pressures between 0.1 Pa and 100 kPa. The characterization tests included the evaluation of pressure stability and desorption rate, a trueness test, and the analysis of the uncertainty budget of the calibration result. The pressure stability test was successfully completed and showed the positive effect of baking on the final pressure in the system. The trueness test allowed concluding that the calibration results with the system are comparable with those obtained with a reference meter traceable to a national metrology institute. The uncertainty budget analysis indicated the dominance of the pressure of the unit under calibration and of the initial pressure in the small tank in different pressure ranges on the uncertainty of the result. A comparison with a Monte Carlo simulation led to the conclusion that in this situation, the GUM (Guide to the Expression of Uncertainty in Measurement) method is not ideal for estimating the uncertainty of the results.
Źródło:
Metrology and Measurement Systems; 2021, 28, 3; 593-604
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static load test curve analysis based on soil field investigations
Autorzy:
Siemaszko, P.
Meyer, Z.
Powiązania:
https://bibliotekanauki.pl/articles/202201.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
static pile test
skin friction
static load test curve
soil characteristics
badanie statyczne
obciążenie
cechy gleb
Opis:
This paper expands the M-K curve theory with examples of the most commonly mentioned pile-soil mechanics behaviours in the literature and their corresponding κ 2 variations. A brief introduction shows the history of the Meyer-Kowalow theory and its basic assumptions. This is followed by the relationship between in situ investigation CPT results, with parameters C1, C2, Ct used to approximate the load-settlement curve according to the M-K theory. The Meyer-Kowalow curve satisfies asymptotic behaviour for small loads, where linear theory applies, and for limit loads, when pile displacement is out of control. Essential in the description are constant parameters C, which refer to the aggregated Winklers modulus, Ngr limit loads and k, which is crucial for static load test results. For this reason, the authors sought to calculate the κ value based upon soil mechanics principles. This article shows methods for checking statistical mathematical calculations, published earlier by Meyer using CPT investigations. It presents real case calculations and directions for future planned research.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 329-337
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forty-Five Years of the Rigid Finite Element Method
Autorzy:
Wittbrodt, E.
Wojciech, S.
Powiązania:
https://bibliotekanauki.pl/articles/139900.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modelling dynamics
RFEM
static and dynamic analysis
Opis:
The Rigid Finite Element Method (RFEM) is an original Polish method for modelling dynamics of complex mechanical systems with flexible elements. Its origin dates back to the sixties of the last century. The idea of the Rigid Finite Element Method, inseparably connected with Professor Jan Kruszewski-Majewski from Gdansk University of Technology.
Źródło:
Archive of Mechanical Engineering; 2013, LX, 3; 313-317
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimating the uncertainty of tensile strength measurement for a photocured material produced by additive manufacturing
Autorzy:
Adamczak, S.
Bochnia, J.
Kaczmarska, B.
Powiązania:
https://bibliotekanauki.pl/articles/221806.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
static tensile test
measurement error
measurement uncertainty
Opis:
The aim of this study was to estimate the measurement uncertainty for a material produced by additive manufacturing. The material investigated was FullCure 720 photocured resin, which was applied to fabricate tensile specimens with a Connex 350 3D printer based on PolyJet technology. The tensile strength of the specimens established through static tensile testing was used to determine the measurement uncertainty. There is a need for extensive research into the performance of model materials obtained via 3D printing as they have not been studied sufficiently like metal alloys or plastics, the most common structural materials. In this analysis, the measurement uncertainty was estimated using a larger number of samples than usual, i.e., thirty instead of typical ten. The results can be very useful to engineers who design models and finished products using this material. The investigations also show how wide the scatter of results is.
Źródło:
Metrology and Measurement Systems; 2014, 21, 3; 553-560
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress and strain measurements in static tensile tests
Autorzy:
Adamczak, S.
Bochnia, J.
Kundera, C.
Powiązania:
https://bibliotekanauki.pl/articles/221886.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
static tensile strength test
measurement error
measurement uncertainty
Opis:
The paper deals with the accuracy of measurements of strains (elongation and necking) and stresses (tensile strength) in static room-temperature tensile strength tests. We present methods for calculating measurement errors and uncertainties, and discuss the determination of the limiting errors of the quantities measured for circular and rectangular specimens, which is illustrated with examples.
Źródło:
Metrology and Measurement Systems; 2012, 19, 3; 531-540
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static Characteristics of Air Gauges Applied in the Roundness Assessment
Autorzy:
Jermak, C. J.
Rucki, M.
Powiązania:
https://bibliotekanauki.pl/articles/220421.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
air gauges
out-of-roundness
static characteristics
multiplication
Opis:
In the article, analysis of the work conditions and the metrological characteristics of the air gauges dedicated for the roundness assessment is described. To reach the required accuracy of the acquired data, the phenomena of gas dynamics had to be analyzed in the whole flow through elements of the air gauge. A model based on the second critical parameters was used, because it reflects the true processes of the air flow. As a result, fast and accurate simulations provided series of the characteristics to be considered. Nevertheless, the chosen air gauge configuration underwent the experimental verification of its metrological characteristics. Finally, the entire measurement system Geoform with the gauge head based on the chosen air gauges underwent the accuracy test in order to make sure of its overall measurement quality.
Źródło:
Metrology and Measurement Systems; 2016, 23, 1; 85-96
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Deformation Method on the Microstructure and Properties of Magnesium Alloy WE43
Autorzy:
Bednarczyk, I.
Kuc, D.
Tkocz, M.
Tomaszewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/353617.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnesium alloys
SPD method
microstructure
static tensile test
Opis:
The article presents tests results of the influence of deformation methods on the microstructure and properties of alloy WE43. There were direct extrusion tests and extrusion with KoBo method performed. An assessment of the influence of the methods of deformation on the microstructure and the mechanical properties of the achieved rods from alloy WE43 was conducted. There was an analysis of microstructure carried out with the use of light and scanning microscopy techniques in the initial state and after plastic deformation. Static tensile test was conducted in temperature of 350°C at a speed of 0.0001 m·s-1 and microhardness measurements were performed of HV0.2. On the basis of the achieved mechanical tests results it was stated that in the temperature of 350°C for samples deformed with the use of KoBo method there was an effect of superplastic flow found. The value of elongation achieved was 250% which was 3 times higher than in case of classic extrusion (80%).
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1975-1980
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DC characteristics of the SiC Schottky diodes
Autorzy:
Janke, W.
Hapka, A.
Oleksy, M.
Powiązania:
https://bibliotekanauki.pl/articles/202279.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silicon carbide
Schottky diodes
static characteristics
high-temperature
Opis:
The isothermal and non-isothermal characteristics of silicon carbide Schottky diodes in the wide range of currents and ambient temperatures are investigated in this paper. The measurements of the diodes characteristics have been performed with the use of a pulse method, with fast registration of measurement points after the diode current turning on, or with the use of a fully static method, in which the self-heating phenomenon is taken into account. Apart from the measurements, the series of numerical experiments, giving the isothermal and non-isothermal characteristics as a result, were executed. The complex, accurate numerical procedures as well as simplified analytical calculations were implemented. A good conformity of all calculation and measurement results have been obtained. In the presented investigations, for relatively high currents and ambient temperatures, the influence of self-heating on the SiC Schottky diodes static characteristics is significant. The large (even 4 V for the ambient temperature 300.C ) values of voltages corresponding to the nominal diode currents have been observed.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 2; 183-188
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of sensitivity analysis to the correction of static characteristics of a phase angle modulator
Autorzy:
Sroka, R.
Powiązania:
https://bibliotekanauki.pl/articles/220462.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
phase modulator
sensitivity analysis
static characteristics
methods of correction
Opis:
The paper presents definitions and relative measures of the system sensitivity and sensitivity of its errors. The model of a real system and model of an ideal measuring system were introduced. It allows to determine the errors of the system. The paper presents also how to use the error sensitivity analysis carried out on the models of the measuring system to the correction of the nonlinearity error of its static characteristic. The corrective function is determined as a relation between the input variable of the tested system and its chosen parameter. The use of the proposed method has been presented on the example of a phase angle modulator. The obtained results have been compared with the results of analytic calculations. The idea of a phase angle modulator is also presented.
Źródło:
Metrology and Measurement Systems; 2011, 18, 2; 249-259
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Psychological processes of perceiving implied motion in static images
Autorzy:
Khatin-Zadeh, Omid
Powiązania:
https://bibliotekanauki.pl/articles/2129924.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Static images
Implied motion
The motor system
Motion event
Opis:
The aim of this study was to investigate four sources of implied motion in static images (a moving object as the source of implied motion, hand movements of the image creator as the source of implied motion, past experiences of the observer as the source of implied motion, and fictive movement of a point across an image as the source of implied motion). In the experiment of the study, participants orally described 16 static images that appeared on the screen of a computer. The aim was to find whether participants had used any motion-related word to describe each image. It was assumed that using motion-related words to describe a static image was an indication that the image had created a sense of motion for the observer. These results indicated that all four types of implied motion could create a significant sense of motion for the observer. Based on these results, it is suggested that observing these images could lead to simulating the actions involved in those motion events and the activation of the motor system. Finally, it is proposed that the three characteristics of being rule-based (clearly-defined), continuous, and gradual are critical in perceiving that image as a fictive motion.
Źródło:
Polish Psychological Bulletin; 2021, 52, 4; 334-340
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of the Microstructure and Properties of Mg-Li Magnesium Alloy after Deformation by the KoBo Method
Autorzy:
Bednarczyk, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/2134107.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Mg-Li alloys
metod SPD
static compression test
microstructure
Opis:
The article presents the results of tests of plastic shaping of magnesium alloy Mg-Li. Magnesium alloy for an extrusion process was obtained with the method of vacuum smelting and casting into graphite moulds. The materials for tests were slabs cast from magnesium alloys with symbols: Mg-4%Li-1%Ca (LX41). Before the process of deformation the castings were subject to homogenization. Conventional extrusion tests were conducted in a complex state of deformation (KoBo method). An assessment was performed of the influence of the deformation process parameters on the structure and properties of the tested alloy. Results of mechanical tests were presented both for static compression test in room temperature. On the basis of the achieved tests results, the susceptibility to plastic working for the Mg-4%Li-1%Ca alloy was determined. An analysis of the microstructure was conducted both in the initial condition and after plastic deformation with the use of light and scanning microscopy techniques. The applied deformation methods allowed the determination of the influence of process parameters on changes in the microstructure and properties of the Mg-4%Li-1%Ca alloy.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1179--1184
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 53

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