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Wyświetlanie 1-15 z 44
Tytuł:
Water-paraffin dispersion systems: manufacturing and application
Autorzy:
Yovchenko, Alla
Bespalko, Sergii
Tryhub, Oksana
Poliakov, Sviatoslav
Baret, Guy
Munoz, Miranda Alberto
Powiązania:
https://bibliotekanauki.pl/articles/1429993.pdf
Data publikacji:
2020
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
heat storage
phase change material
phase change suspension
surface active agent
enthalpy
solar heating system
magazynowanie ciepła
materiał o przemianie fazowej
środek powierzchniowo czynny
entalpia
system ogrzewania słonecznego
Opis:
The paper presents the study results of the stability and heat storage capacity of paraffin-in-water phase change suspensions (PCSs) obtained by the homogenization of paraffin and water in the developed rotary hydrodynamic homogenizer. The optimal concentration of components for obtaining stable paraffin-in-water suspensions is found. It is shown that the stable PCSs in the form of pastes, gels, and liquids can be obtained depending on the concentration of water, paraffin, and the surface active agent (SAA) as well as its type. In addition, the scheme of the solar heating system with the heat storage tank where the PCS functions both as the heat transfer fluid and the heat storage media is presented. It is shown that the use of PCS in the domestic solar heating system allowed the heat storage capacity of the storage tank to be increased by 25% as a result of the high fusion heat of paraffin and the high value of the water specific heat capacity. The estimation of the saving rate from applying fluid PCS as a heat storage medium is also presented and discussed.
Źródło:
Acta Innovations; 2020, 36; 31-47
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occurrence of mycotoxins in talkan: a cereal-based food traditional for Turkic population
Autorzy:
Tattibayeva, D.
Nebot, C.
Miranda J.M.
Abuova, A.B.
Kizatova, M.Z.
Vazquez, B.
Powiązania:
https://bibliotekanauki.pl/articles/2087741.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
food-contamination
corn
fungi
HPLC-MS/MS
Kazakhstan
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 2; 333-341
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Synergic Relationship Between Industry 4.0 and Lean Management: Best Practices from the Literature
Autorzy:
Santos, Beatrice Paiva
Enrique, Daisy Valle
Maciel, Vinicius B.P.
Lima, Tânia Miranda
Charrua-Santos, Fernando
Walczak, Renata
Powiązania:
https://bibliotekanauki.pl/articles/1841433.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Industry 4.0
lean management
advanced technology
manufacturing management
best practices
Opis:
Industry 4.0 promises to make manufacturing processes more efficient using modern technologies like cyber-physical systems, internet of things, cloud computing and big data analytics. Lean Management (LM) is one of the most widely applied business strategies in recent decades. Thus, implementing Industry 4.0 mostly means integrating technologies in companies that already operate according to LM. However, due to the novelty of the topic, research on how LM and Industry 4.0 can be integrated is still under development. This paper explores the synergic relationship between these two domains by identifying six examples of real cases that address LM-Industry 4.0 integration in the extant literature. The goal is to make explicit the best practices that are being implemented by six distinct industrial sectors such as automotive, paper, furniture, healthcare, apparel, and machine manufacturing.
Źródło:
Management and Production Engineering Review; 2021, 12, 1; 94-107
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Definability in Infinitary Languages and Invariance by Automorphisms
Autorzy:
Rodrigues, Alexandre A.M.
Filho, Ricardo C. Miranda
de Souza, Edelcio G.
Powiązania:
https://bibliotekanauki.pl/articles/1368480.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Opis:
Given a $\mathcal L_{\alpha\beta} ^E$-structure $E$, where $\mathcal L_{\alpha\beta} ^E$ is an infinitary language, we show that $\alpha$ and $\beta$ can be chosen in such way that every orbit of the group $G$ of automorphisms of $E$ is $\mathcal L_{\alpha\beta} ^E$-definable. It follows that two sequences of elements of the domain $D$ of $E$ satisfy the same set of $\mathcal L_{\alpha\beta}$-formulas if and only if they are in the same orbit of $G$.
Źródło:
Reports on Mathematical Logic; 2010, 45; 119-133
0137-2904
2084-2589
Pojawia się w:
Reports on Mathematical Logic
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization System to Minimize Exposure to Occupational Noise
Autorzy:
Reis, Déborah
Miranda, João
Reis, Jorge
Duarte, Marcus
Powiązania:
https://bibliotekanauki.pl/articles/2141683.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustics
noise
optimization
dosimetry
Opis:
This research deals with the development of an optimization system to minimize employee noise exposure in the work environment. It is known from the literature that continuous exposure to high noise levels can cause heart overload, stress, fatigue, and increase accident numbers at a production line. Thus, it is necessary to develop acoustic solutions at an industrial level that could minimize failures and accident occurrences. The rules that regulate occupational noise exposures allow an assessment of the degrees of exposure and subsequent corrections of working conditions. It is observed that the exposure is necessary for further evaluation and correction. Therefore, this research proposes to simulate occupational noise exposure conditions through mathematical models implemented in C++, using the GUROBI linear optimization package and to act previously to minimize ONIHL (Occupational Noise-Induced Hearing Loss). One of this work results is based on Doses Values, TWA (Time Weighted Average) and Distances Covered, using these three factors simultaneously through the optimization, it obtains a route that minimizes exposure and avoids ONIHL. Although there is a need for balanced doses between employees, to this end, the Designation Problem was implemented. Thus, with the routes obtained by optimization, an efficient allocation task was made for the maintenance crew, resulting in minimized and balanced doses. This model was applied to a real industrial plant that will not be identified, only methodology and results obtained will be presented.
Źródło:
Archives of Acoustics; 2022, 47, 1; 15-23
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie modelu złoża w długoterminowym prognozowaniu zawartości siarki S T/R w węglu brunatnym dostarczanym do Elektrowni Bełchatów
The use of the deposit model in long term forecasting of sulfur content S T/R in brown coal supplied to Belchatow Power Plant
Autorzy:
Ptak, Miranda
Kasztelewicz, Zbigniew
Gądek, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2029218.pdf
Data publikacji:
2022
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
prognoza zawartości siarki w węglu
model jakościowy złoża
coal sulfur content forecast
deposit quality mode
Opis:
Realistyczne długoterminowe prognozowanie parametrów węgla dostarczanego z Kopalni do Elektrowni Bełchatów i efektywne zarządzanie i stabilizowanie zawartości siarki w węglu dostarczanym do Elektrowni pozwala na optymalną, ze względu na wydajność i ciągłość funkcjonowania, eksploatację Instalacji Odsiarczania Spalin w elektrowni. Artykuł omawia założenia i sposób opracowania długoterminowej prognozy parametrów jakościowych zbiorczej strugi węgla dostarczanego z Kopalni Bełchatów do Elektrowni Bełchatów. Przedstawiony w artykule proces to aktualny przykład praktycznego wykorzystanie funkcjonującego w Dziale Technologii Górniczej systemu wspomagania planowania robót górniczych działającego w oparciu o stworzony i aktualizowany w Dziale Geologicznym Kopalni cyfrowy model złoża.
Realistic long-term forecasting of the parameters of coal supplied from the Mine to the Belchatow Power Plant allows for optimal, in terms of efficiency and uninterrupted operation, usage of the fumes desulphurization installation operating in the power plant . The article discusses the assumptions and means of developing a long-term quality parameter forecast for the collective coal stream delivered from the Bełchatów Mine to the Bełchatów Power Plant. The process presented in the article is an up to date example of practical use of mine planning system functioning in the Mining Technology Department, operating on the basis of a digital deposit model created and periodically updated in the Geological Department of the Belchatow Mine.
Źródło:
Górnictwo Odkrywkowe; 2021, 62, 1; 17--22
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction and Biosorption of Cr(VI) from Aqueous Solutions by Acid- -Modifi ed Guava Seeds: Kinetic and Equilibrium Studies
Autorzy:
Ortíz-Gutiérrez, Marel
Alfaro-Cuevas-Villanueva, Ruth
Martínez-Miranda, Verónica
Hernández-Cristóbal, Orlando
Cortés-Martínez, Raúl
Powiązania:
https://bibliotekanauki.pl/articles/778567.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Guava seeds
chromium reduction
biosorption
isotherms
Opis:
The use of guava seeds (GS) and acid-modified guava seeds (MGS) for the removal of Cr(VI) from aqueous solutions was investigated. Batch-type experiments were performed with Cr(VI) aqueous solutions and biosorbents to determine the kinetic and equilibrium sorption parameters. Results indicated that GS and MGS were capable of reducing and remove Cr(VI) from solutions, but the reduction was only observed at some experimental conditions. Infrared analysis showed that several functional groups were involved in the reduction, and biosorption of Cr(VI), particularly alcohol, phenolic, carboxylic, and methoxymethyl structures. The mechanisms of reduction and biosorption depended upon the type of biosorbent, pH, and temperature of the system. The pseudo-second-order kinetic model describes the kinetic sorption data, and the Langmuir-Freundlich (L-F) model describes the isotherm data in most cases. Significantly high total chromium biosorption capacities were obtained. Acid modification of guava seeds improves chromium biosorption performance.
Źródło:
Polish Journal of Chemical Technology; 2020, 22, 4; 36-47
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Miranda Aldhouse-Green, Bog Bodies Uncovered: Solving Europe’s Ancient Mystery, Londyn 2015
Autorzy:
Okoński, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/436411.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
bog bodies
epoka brązu
epoka żelaza
archeologia
Źródło:
Res Gestae. Czasopismo Historyczne; 2016, 3; 314-321
2450-4475
Pojawia się w:
Res Gestae. Czasopismo Historyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mixing in strongly stratified bottom cavities of estuaries: an experimental study
Autorzy:
Nino, Y.
Miranda, J. F.
Powiązania:
https://bibliotekanauki.pl/articles/240968.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
stratified flows
mixing
estuaries
experimental methods
Acoustic Doppler Velocimetry
Opis:
Results of an experimental study on the mixing characteristics of the stratified flow inside bottom cavities in salt wedge estuaries are presented and discussed. The experiments were conducted in a laboratory flume where a cavity was formed by placing two consecutive sills over the channel bottom. The cavity was filled with a bottom layer of saline water with a sharp density interface. A constant fresh water discharge was supplied at the upstream end of the flume. An ADV and a fast conductivity probe were used to measure the turbulence and salinity structure inside the cavity. Flow visualizations were made, in addition, to keep track of the position of the density interface inside the cavity. The density interface tilts in the downstream direction with a slope that increases as the local densimetric Froude number, Frd, increases. This slope can be reasonably estimated from a linear analysis of the response of the 2-layer stratified fluid to an interfacial shear stress. The entrainment velocity, or rate of interface deepening due to mixing, decreases as Frd increases, which appears to be the consequence of a decreasing mixing efficiency related to the tilting of the interface. The present entrainment velocity data compares well with existing experimental data and models, validating the latter on an extended range of relevant parameters. By scaling these results to a prototype such as the Valdivia Estuary in Chile, it is concluded that purging of the saline water trapped inside of bottom cavities cannot be completed during a tidal period.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2003, 50, 4; 401-413
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A sub-µ W conductance converter for bioimplantable devices
Autorzy:
Miranda, N.
Morais, R.
Powiązania:
https://bibliotekanauki.pl/articles/397863.pdf
Data publikacji:
2010
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
pomiar przewodności
typ elektronicznych układów scalonych
conductance measurement
biologic tissue micro-power
ASIC
Opis:
This article describes a new electrical conductance converter method suitable for very low power applications, where energy constraints prevail over speed and measurement accuracy. This method gathers voltage integration and shopper stabilization techniques to process noisy Ion level signals and overcome severe limitations of weak inversion channel CMOS circuitry. Main features, tradeoffs and upgrades are exploited. Besides that, the paper presents the circuit schematics for a standard 0.35 µm CMOS implementation. Post-layout simulations show a total current consumption lower than 750nA, including current source excitation inherent to the conductance measurement. Such low power consumption allows measuring several physical parameters using self-powered wireless sensors networks.
Źródło:
International Journal of Microelectronics and Computer Science; 2010, 1, 3; 236-240
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Satellite estimates of the long-term trend in phytoplankton size classes in the coastal waters of North-Western Bay of Bengal
Autorzy:
Miranda, J.
Lotliker, A.A.
Baliareingh, S.K.
Jena, A.K.
Samanta, A.
Sahu, K.C.
Kumar, T.S.
Powiązania:
https://bibliotekanauki.pl/articles/2079007.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
phytoplankton
size class
coastal water
long-term variability
satellite data
statistical analysis
Bengal Bay
Opis:
The study presents long-term variability in satellite retrieved phytoplankton size classes (PSC) at two coastal sites, off Gopalpur and Visakhapatnam, in the north-western Bay of Bengal. The abundance-based models by Brewin et al. (2010) (B10) and Sahay et al. (2017) (S17), for retrieval of PSC (micro, nano, and picophytoplankton), from satellite data, were validated. Both the models performed well in the retrieval of nano and microphytoplankton. However, B10 performed poorly in retrieving picophytoplankton. The statistical analysis indicated better performance of the S17 model and hence was applied to Moderate Resolution Imaging Spectroradiometer onboard Aqua satellite (MODISA) data to understand the temporal (at monthly climatology) and spatial variability (from nearshore to offshore). The spatial distribution indicated nearshore dominance of micro and offshore dominance of picophytoplankton. In nearshore waters off Gopalpur, microphytoplankton dominated throughout the year except for months of south-west monsoon (June and July) where the dominance of picophytoplankton was observed. All PSC exhibited similar distribution at an annual scale with a primary peak during pre-monsoon (March and April) and a secondary peak during post-monsoon (September— November). However, microphytoplankton concentration during post-monsoon was higher off Gopalpur in comparison to Visakhapatnam. The higher microphytoplankton concentration during pre-monsoon was attributed to recurrent phytoplankton blooms. Whereas, post-monsoon increment could be attributed to enhanced phytoplankton growth by availing nutrients sourced from monsoonal precipitation induced terrigenous influx. The outcome of the present study recommends the use of the S17 model for satellite retrieval of PSC from the north-western Bay of Bengal.
Źródło:
Oceanologia; 2021, 63, 1; 40-50
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impulsive Sound Detection Directly in Sigma-Delta Domain
Autorzy:
Miranda, I. D. dos S.
Lima, A. C. de C.
Powiązania:
https://bibliotekanauki.pl/articles/176966.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
impulsive signal detection
sigma-delta modulation
discrete cosine transform
Opis:
Recent implementations of Sigma-Delta (ΣΔ) converters have achieved low cost, low power consumption, and high integration while maintaining resolution as high as in Nyquist-rate converters. However, its usage implies demodulating the source signal delivered from ΣΔ modulation to Pulse-Code Modulation (PCM) on a pre-processing stage. This work proposes an algorithm based on Discrete Cosine Transform for impulsive signal detection to be applied directly on a modulated ΣΔ bitstream, targeting to reduce computational cost in acoustic event detection applications such as gunshot recognition systems. From pre-recorded impulsive sounds in ΣΔ format, it has been shown that the new method presents a similar error rate in comparison with traditional energy-based approaches in PCM, meanwhile, it reduces significantly the number of operations per unit time.
Źródło:
Archives of Acoustics; 2017, 42, 2; 255-261
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 44

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