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Wyświetlanie 1-15 z 19
Tytuł:
Fixed Bed System Packed with Porous Materials for Removal of Organic Dye from Wastewater
Autorzy:
Cho, Young-Sang
Sung, Sohyeon
Powiązania:
https://bibliotekanauki.pl/articles/2203706.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
porous particles
photocatalyst
adsorbent
fixed bed
Opis:
Fixed beds were adopted for removal of organic dye from water by photocatalytic decomposition or adsorption. To this end, macroporous titania or silica micro-particles were synthesized from emulsions as micro-reactors and packed in the bed. During feeding aqueous methylene blue solution, UV light was irradiated for generation of active radicals for removal of dye by photocatalytic decomposition. Porous silica particles were also used as adsorbents in the bed for continuous adsorption of organic dye. For regeneration of the porous titania or silica particles, rinsing with fresh water was carried out before repeated cycles.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 51--56
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of transmultiplexer integer filters
Autorzy:
Ziółko, M.
Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/229408.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fixed point arithmetic
MIMO systems
integer digital filters
Opis:
The designing of transmultiplexer systems relies on determining filters for the transmitter and receiver sides of multicarrier communication system. The perfect reconstruction conditions lead to the bilinear equations for FIR filter coefficients. Generally there is no way of finding all possible solutions. This paper describes methods of finding a large family of solutions. Particular attention is devoted to obtaining algorithms useful in fixed-point arithmetic needed to design the integer filters. As a result, the systems perform perfect reconstruction of signals. Additionally, a simple method is presented to transform any transmultiplexer into an unlimited number of different transmultiplexers. Finally, two examples of integer filters that meet perfect reconstruction conditions are shown. The first illustrates a FIR filter which does not require multiplications. The frequency properties of filters and signals are discussed for the second example.
Źródło:
Archives of Control Sciences; 2018, 28, 2; 223-238
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Damage Investigation of Silver-Soldered Stainless Steel Orthodontic Appliances Used in Vivo
Ocena zniszczeń korozyjnych używanych in vivo stałych aparatów ortodontycznych o połączeniach lutowanych na bazie srebra
Autorzy:
Łępicka, M.
Grądzka-Dahlke, M.
Szarmach, I.
Powiązania:
https://bibliotekanauki.pl/articles/352904.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
corrosion
fixed orthodontic appliances
dental materials
noble solder
silver solder
Opis:
Processes of destruction of products used in orthodontic treatment, e.g. fixed orthodontic appliances, microimplants or dental prostheses considerably limit its operational lifetime and comfort and safety of patients. The objective of the research was to evaluate and assess corrosion damage to silver-soldered stainless steel rapid palatal expansion Hyrax devices. Used in vivo for 2 or 6 months, respectively, RPE (rapid palatal expansion) devices were analyzed macroscopically and in a scanning electron microscope with an energy X-ray analyzer for signs of corrosion. The evaluated appliances showed discernible differences between the overall condition of the noble solders and the stainless steel elements. The Ag-rich solders were chiefly covered in corrosion pits, whereas stainless steel wires, molar bands and Hyrax screws presented corrosion-free surfaces. What is more, the EDS analysis showed differential element composition of the solders. According to the results, noble materials, such as Ag-rich solders, can corrode in a salivary environment when coupled with stainless steel. The selective leaching processes are observed.
Procesy niszczenia produktów wykorzystywanych w leczeniu ortodontycznym, takich jak: stałych aparatów ortodontycznych, mikroimplantów oraz elementów protetyki stomatologicznej znacząco skracają trwałość eksploatacyjną wyrobów gotowych oraz obniżają komfort leczenia i poziom bezpieczeństwa pacjentów. Celem pracy jest ocena zniszczeń korozyjnych powstałych podczas eksploatacji wykonanych ze stali nierdzewnej stałych aparatów ortodontycznych typu Hyrax przeznaczonych do poszerzania szczęki na skutek tzw. szybkiej ekspansji podniebienia. Używane in vivo od 2 do 6 miesięcy aparaty RPE (rapid palatal expansion) przeanalizowano makroskopowo, za pomocą skaningowego mikroskopu elektronowego oraz przy użyciu rentgenowskiego spektroskopu dyspersyjnego. Analiza uzyskanych wyników wyraźnie wskazuje na różnicę w ogólnym stanie pomiędzy elementami wykonanymi ze stali nierdzewnej i lutami na bazie srebra. Połączenia lutowane we wszystkich analizowanych aparatach uległy dostrzegalnemu makroskopowo roztwarzaniu korozyjnemu, natomiast części konstrukcyjne wykonane ze stali 316L, takie jak: śruby, druty oraz pierścienie trzonowe wolne były od korozji. Co więcej, wykonana analiza składu chemicznego połączeń lutowanych wykazała nierównomierne rozłożenie pierwiastków stopowych, wskazujące na występowanie korozji selektywnej. Wyniki zrealizowanych badań wskazują, iż w połączeniu ze stalą nierdzewną w środowisku jamy ustnej możliwe jest roztwarzanie korozyjne materiałów szlachetnych, jakimi są luty srebrowe. Obserwuje się ślady zachodzących procesów selektywnego roztwarzania korozyjnego o szczególnie wysokiej intensywności na granicy stal nierdzewna – lut na bazie srebra.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 4; 2569-2572
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical generation of a fixed bed structure
Autorzy:
Marek, M.
Powiązania:
https://bibliotekanauki.pl/articles/185277.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fixed bed
porosity
structure
numerical modeling
porowatość
struktura
modelowanie numeryczne
Opis:
A numerical algorithm is presented for the filling process of a cylindrical column with equilateral cylinders. The process is based on simplified mechanics – the elements are added one by one until the mechanical equilibrium is reached. The final structure is examined with respect to the global and local porosity distribution. Oscillating radial porosity profile is obtained in accordance with experimental data.
Źródło:
Chemical and Process Engineering; 2013, 34, 3; 347-359
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trash contracts? The impact of temporary employment on leaving the parental home in Poland
Autorzy:
Baranowska-Rataj, Anna
Powiązania:
https://bibliotekanauki.pl/articles/418286.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fixed-term contracts
temporary employment
leaving parental home
transition to adulthood
Opis:
poland stands out in international comparisons as a country where leaving the parental home is remarkably delayed. There are many economic and institutional factors which contribute to postponement of residential independence among youth, such as housing shortages, limited availability of rental housing and limited social assistance for young people. however, there is little discussion in public debate about re-designing social policy support for youth or improving the situation on the housing market. What attracts attention instead is the role of flexibilisation of contractual arrangements on the polish labour market. In media discourse, fixed- term contracts have been labelled as “trash contracts” and all the problems that young people in poland face when making the transition to adulthood have been attributed to the spread of this specific employment form. This article aims to find out whether fixed-term contracts do indeed hinder residential independence of youth. Models of leaving the parental home are estimated based on panel data from EU-SIlC. The results show no significant negative impact of temporary employ- ment on the probability of establishing one’s own household among youth. What matters is whether young people have jobs at all, whereas the type of contract that they receive from employers seems to be of little importance.
Źródło:
Studia Demograficzne; 2011, 1(159); 57-73
0039-3134
Pojawia się w:
Studia Demograficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The applications of fixed-point theorem in optimisation problems
Autorzy:
Chwastek, K.
Powiązania:
https://bibliotekanauki.pl/articles/140506.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optymalizacja
histereza
estymacja parametru
optimisation
fixed-point theorem
hysteresis
parameter estimation
Opis:
The fixed-point theorem is widely used in different engineering applications. The present paper focuses on its applications in optimisation. A Matlab toolbox, chich implements the branch-and-bound optimisation method based on the fixed-point theorem, is used for solving different real-life test problems, including estimation of model parameters for the Jiles-Atherton model.
Źródło:
Archives of Electrical Engineering; 2012, 61, 2; 189-198
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration control of a rotating shaft by passive mass-spring-disc dynamic vibration absorber
Autorzy:
Nguyen, Duy Chinh
Powiązania:
https://bibliotekanauki.pl/articles/139942.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
torsional vibration
optimal parameters
minimum quadratic torque
equivalent viscous resistance
fixed-point
Opis:
Shaft is a machine element which is used to transmit rotary motion or torque. During transmission of motion, however, the machine shaft doesn’t always rotate with a constant angular velocity. Because of unstable current or due to sudden acceleration and deceleration, the machine shaft will rotate at a variable angular velocity. It is this rotary motion that generates the moment of inertial force, causing the machine shaft to have torsional deformation. However, due to the elasticity of the material, the shaft produces torsional vibration. Therefore, the main objective of this paper is to determine the optimal parameters of dynamic vibration absorber to eliminate torsional vibration of the rotating shaft that varies with time. The new results in this paper are summarized as follows: Firstly, the author determines the optimal parameters by using the minimum quadratic torque method. Secondly, the maximization of equivalent viscous resistance method is used for determining the optimal parameters. Thirdly, the author gives the optimal parameters of dynamic vibration absorber based on the fixed-point method. In this paper, the optimum parameters are found in an explicit analytical solutions, helping the scientists to easily find the optimal parameters for eliminating torsional vibration of the rotating shaft.
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 3; 279-297
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fixed-latency System for High-speed Serial Transmission Between FPGA Devices with Forward Error Correction
Autorzy:
Kruszewski, Michał
Zabołotny, Wojciech Marek
Powiązania:
https://bibliotekanauki.pl/articles/226360.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
data transmission
fixed-latency transmission
forward error correction
orthogonal concatenated coding
FPGA
Opis:
This paper presents the design of a compact protocol for fixed-latency, high-speed, reliable, serial transmission between simple field-programmable gate arrays (FPGA) devices. Implementation of the project aims to delineate word boundaries, provide randomness to the electromagnetic interference (EMI) generated by the electrical transitions, allow for clock recovery and maintain direct current (DC) balance. An orthogonal concatenated coding scheme is used for correcting transmission errors using modified Bose–Chaudhuri–Hocquenghem (BCH) code capable of correcting all single bit errors and most of the double-adjacent errors. As a result all burst errors of a length up to 31 bits, and some of the longer group errors, are corrected within 256 bits long packet. The efficiency of the proposed solution equals 46.48%, as 119 out of 256 bits are fully available to the user. The design has been implemented and tested on Xilinx Kintex UltraScale+ KCU116 Evaluation Kit with a data rate of 28.2 Gbps. Sample latency analysis has also been performed so that user could easily carry out calculations for different transmission speed. The main advancement of the work is the use of modified BCH(15, 11) code that leads to high error correction capabilities for burst errors and user friendly packet length.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 3; 545-553
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Banach fixed-point theorem in semilinear controllability problems – a survey
Autorzy:
Klamka, J.
Babiarz, A.
Niezabitowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200909.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
complete controllability
Banach space
Hilbert space
fixed-point
infinite dimensional space
sterowność
przestrzeń Banacha
przestrzeń Hilberta
Opis:
The main aim of this article is to review the existing state of art concerning the complete controllability of semilinear dynamical systems. The study focus on obtaining the sufficient conditions for the complete controllability for various systems using the Banach fixedpoint theorem. We describe the results for stochastic semilinear functional integro-differential system, stochastic partial differential equations with finite delays, semilinear functional equations, a stochastic semilinear system, a impulsive stochastic integro-differential system, semilinear stochastic impulsive systems, an impulsive neutral functional evolution integro-differential system and a nonlinear stochastic neutral impulsive system. Finally, two examples are presented.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 21-35
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Earplug Actuator Selection for a Miniature Personal Active Hearing Protection System
Autorzy:
Pawełczyk, M.
Latos, M.
Powiązania:
https://bibliotekanauki.pl/articles/178052.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
active noise control
fixed-parameter control
high-level noise
nonstationary noise
feedforward control
earplug
hearing protection
Opis:
There are many industrial environments which are exposed to a high-level noise. It is necessary to protect people from the noise. Most of the time, the consumer requires a miniature version of a noise canceller to satisfy the internal working place requirements. Very important thing is to select the most appropriate personal hearing protection device, for example an earplug. It should guarantee high passive noise attenuation and allow for secondary sound generation in case of active control. In many cases the noise is nonstationary. For instance, some of the noisy devices are switched on and off, speed of some rotors or fans changes, etc. To avoid any severe transient acoustic effects due to potential convergence problems of adaptive systems, a fixed-parameter approach to control is appreciated. If the noise were stationary, it would be possible to design an optimal control filter minimising variance of the signal being the effect of the acoustic noise and the secondary sound interference. Because of noise nonstationarity for most applications, the idea of generalised disturbance defined by a frequency window of different types has been developed by the authors and announced in previous publications. The aim of this paper is to apply such an approach to different earplugs and verify its noise reduction properties. Simulation experiments are conducted based on real world measurements performed using the G.R.A.S. artificial head equipped with an artificial mechanical ear, and the noise recorded in a power plant.
Źródło:
Archives of Acoustics; 2010, 35, 2; 213-222
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controllability of time varying semilinear non-instantaneous impulsive systems with delay, and nonlocal conditions
Autorzy:
Cabada, Dalia
Garcia, Katherine
Guevara, Cristi
Leiva, Hugo
Powiązania:
https://bibliotekanauki.pl/articles/2134894.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
exact controllability
semilinear time varying control systems
non-instantaneous impulses
delay
nonlocal conditions
Rothe's fixed point theorem
Opis:
In this paper we prove the exact controllability of a time varying semilinear system considering non-instantaneous impulses, delay, and nonlocal conditions occurring simultaneously. It is done by using the Rothe’s fixed point theorem together with some sub-linear conditions on the nonlinear term, the impulsive functions, and the function describing the nonlocal conditions. Furthermore, a control steering the semilinear system from an initial state to a final state is exhibited.
Źródło:
Archives of Control Sciences; 2022, 32, 2; 335--357
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of production control in just-in-time delivery system conditions
Model sterowania produkcją w warunkach dostaw w systemie Just-in-Time
Autorzy:
Kozłowski, E.
Gola, A.
Świć, A.
Powiązania:
https://bibliotekanauki.pl/articles/175919.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
production control
just-in-time strategy
optimization
planning fixed horizon
sterowanie produkcją
strategia Just in Time
optymalizacja
określony horyzont planowania
Opis:
The article presents the mathematical model of production control in the Just-in-time delivery system’s conditions for a planning fixed horizon. The aim of the control model is to determine the demand for means of production (materials, labour force) at the right moment of time. The stochastic model of appearing the fault products was taking into account. Minimization both the costs of manufacturing and possible penalties connected with the incomplete execution of the order was taken as a criterion of optimization process.
W pracy przedstawiono matematyczny model sterowania produkcją w warunkach dostaw w systemie Just-in-time, w określonym horyzoncie czasowym. Model sterujący określa zapotrzebowanie na środki produkcji (materiały, siła robocza) w zdefiniowanych momentach czasu. Pod uwagę wzięto stochastyczny model występowania wyrobów wadliwych w procesie produkcyjnym. Jako kryterium optymalizacji rozważano minimalizację kosztów produkcji oraz ewentualnych kar związanych z niepełną realizacją zamówień.
Źródło:
Advances in Manufacturing Science and Technology; 2014, 38, 1; 77-88
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positive output elementary Luo converter for fixed-frequency ZVS operation
Autorzy:
Bright, S. J. V.
Ramkumar, S.
Anand, H.
Powiązania:
https://bibliotekanauki.pl/articles/200011.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fixed-frequency ZVS
positive output elementary Luo converter
POELC
zero-voltage switching-pulse width modulation
ZVS-PWM
konwerter Luo
ZVS
Opis:
Luo converter is one amid the developed DC-DC converters offering higher voltage gain. Soft-switching techniques, like zero-voltage switching (ZVS), repress switching losses, and hence the system efficiency and the life of the power semiconductor switches are improved. Incorporation of soft switching in fixed-frequency operation of the Luo converters may persuade them in the regulated power supply applications. The existing variable switching frequency solution suffers from a number of problems viz. complexity in filter designing, more electromagnetic interference (EMI), etc. This paper proposes a positive output elementary Luo converter (POELC) involving ZVS with the wherewithal of working in fixed frequency. A comprehensive discussion on the proposed circuit topology is detailed with both simulation and experimental studies. Systematic descriptions of basic POELC, variable-frequency ZVS-POELC, and fixed-frequency ZVS-POELC make an impact on the understanding of related concepts by the researchers in this field.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 255-262
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On analog comparators for CMOS digital pixel applications. A comparative study
Autorzy:
Jendernalik, W.
Powiązania:
https://bibliotekanauki.pl/articles/200565.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CMOS image sensor
CMOS digital pixel
analog comparator
fixed-pattern noise
FPN
CMOS
matryca świałoczuła CMOS
piksel cyfrowy
komparator analogowy
hałas ustalony
Opis:
Voltage comparator is the only - apart from the light-to-voltage converter - analog component in the digital CMOS pixel. In this work, the influence of the analog comparator nonidealities on the performance of the digital pixel has been investigated. In particular, two versions of the digital pixel have been designed in 0.35 μm CMOS technology, each using a different type of analog comparator. The properties of both versions have been compared. The first pixel utilizes a differential comparator with the increased size and improved electrical performance. The second structure is based on a very simple non-differential comparator with a reduced size and degraded performance. Theoretical analysis of the comparator nonideality effect on the quality of the image obtained from the digital pixel matrix as well as simulation results are provided.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 2; 271-278
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust zeroing neural networks with two novel power-versatile activation functions for solving dynamic Sylvester equation
Autorzy:
Zhou, Peng
Tan, Mingtao
Powiązania:
https://bibliotekanauki.pl/articles/2173674.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
recurrent neural network
RNN
zeroing neural network
ZNN
robust zeroing neural network
RZNN
fixed-time convergence
rekurencyjna sieć neuronowa
zerowanie sieci neuronowej
konwergencja w ustalonym czasie
Opis:
In this work, two robust zeroing neural network (RZNN) models are presented for online fast solving of the dynamic Sylvester equation (DSE), by introducing two novel power-versatile activation functions (PVAF), respectively. Differing from most of the zeroing neural network (ZNN) models activated by recently reported activation functions (AF), both of the presented PVAF-based RZNN models can achieve predefined time convergence in noise and disturbance polluted environment. Compared with the exponential and finite-time convergent ZNN models, the most important improvement of the proposed RZNN models is their fixed-time convergence. Their effectiveness and stability are analyzed in theory and demonstrated through numerical and experimental examples.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 3; art. no. e141307
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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