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Tytuł:
Deflection ductility of slabs made of hybrid mesh-and-fibre-reinforced cement-based composite
Odkształcenie plastyczności płyt wykonanych z cementowego materiału kompozytowego wzmocnionego siatką hybrydową oraz włóknami
Autorzy:
Sakthivel, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/231261.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kompozyt cementowy
zginanie
odchylenie
plastyczność
siatkobeton
zbrojenie hybrydowe
siatka
włókno
cement-based composite
bending
deflection
ductility
hybrid reinforcement
mesh
fibre
Opis:
Steel Mesh-Reinforced Cementitious Composites (SMRCC) (traditionally known as ferrocement) have been in existence for few decades, but have some limitations set on element thickness and number of reinforcing mesh layers and the resulting deflection ductility. Therefore, the author has made an attempt to explore whether deflection ductility will improve in mesh-reinforced cementitious composites (25 mm thick) if discontinuous fibres are added to slab elements. For this purpose, thin slab elements of dimensions 700 mm (length) × 200 mm (width) × 25 mm (thickness) were cast and subjected to four point bending tests. Based on the flexural tests conducted on SMRCC (Control Slab Elements, cast with Steel Mesh Volume of reinforcement, MVr=0.78, 0.94, and 1.23%) and Hybrid Mesh-and-Fibre-Reinforced Cement Based Composite (HMFRCBC) (Test Slab Elements, combining MVr=0.78, 0.94 and 1.23% and Polyolefin Fibre Volume fraction, PO-FVf=0.5-2.5% of volume of specimens, with 0.5% interval), load-deflection and the deflection ductility index were analyzed. From the flexural load-deflection curves it has been observed that HMFRCBC slabs demonstrate higher flexural load-carrying capacity and deflection ductility when compared to SMRCC slabs. This study shows that higher the polyolefin fibre volume fraction (PO-FVf) from 0.5 to 2.5% (with a 0.5% interval) in HMFRCBC slabs, the higher the flexural deflection ductility. The Deflection Ductility Index (DDI) of HMFRCBC (with 5 layers of mesh and PO-FVf=2.5%) is 4.5 times that of SMRCC. This study recommends that HMFRCBC can be used as an innovative construction material due to its higher flexural ductility characteristics.
Cementowe materiały kompozytowe zbrojone siatką stalową (tradycyjnie znane jako siatkobeton) stanowią innowacyjny materiał składający się z hydraulicznej zaprawy cementowej oraz ciasno rozmieszczonych warstw ciągłej siatki stalowej o małej średnicy oczek do stworzenia sztywnej konstrukcji, a ze względu na swoją doskonałą wytrzymałość na zginanie są wykorzystywane jako prefabrykaty dachowe. Pomimo, że na przestrzeni ostatnich kilkudziesięciu lat na świecie wybudowano kilka konstrukcji siatkobetonowych (prefabrykowane i wylewane na miejscu pierwszorzędne oraz drugorzędne konstrukcje dachowe i elementy belkowe, panele ścienne, ściany zatrzymujące ziemię, prefabrykowane schody, ławki, sklepienia, kopuły, cienkie pergole oraz systemy ochrony przeciwsłonecznej, ściany graniczące z morzem, nadziemne zbiorniki wodne, podziemne zbiorniki ściekowe, baseny i łodzie – wymieniając jedynie kilka), istnieją pewne ograniczenia dotyczące grubości elementu, a także liczby warstw siatki zbrojeniowej oraz wynikowego odchylenia plastyczności. Plastyczność jest niezwykłym zjawiskiem umożliwiającym odkształcenie elementu przy lub w okolicach granicznego obciążenia niszczącego bez znacznej utraty jego wytrzymałości. O zachowaniu plastycznym świadczy jego zdolność do utrzymania wyższych poziomów obciążenia po pierwszym pękaniu na skutek dużych odkształceń. Poprzednie badania wskazują, że nieciągłe włókna mogą być dodane do matrycy cementowej cementowych materiałów kompozytowych zbrojonych siatką stalową w formie hybrydowej w celu poprawy jej wytrzymałości na zginanie oraz odchylenia plastyczności.
Źródło:
Archives of Civil Engineering; 2017, 63, 3; 115-137
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial Decision Support Systems: a conning of age
Autorzy:
Keenan, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/970471.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
system przestrzenny wspomagania decyzji
system informacji przestrzennej
Spatial Decision Support Systems
geographic information systems
Opis:
Decision Support Systems (DDS) have developed to exploit Information Technology (IT) to assist decision-makers in a wide variety of fields. The need to use spatial data in many of these diverse fields has led to increasing interest in the development, of Spatial Decision Support. Systems (SDSS) based around the Geographic Information System (GIS) technology. Tlie paper examines the relationship between SDSS and GIS and suggests that SDSS is poised for further development owing to improvement, in technology and the greater availability of spatial data.
Źródło:
Control and Cybernetics; 2006, 35, 1; 9-27
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using the Cognitive Walkthrough Method in Software Process Improvement
Autorzy:
Polgár, P B
Powiązania:
https://bibliotekanauki.pl/articles/384065.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Usability
Software Process Improvement
Cognitive walkthrough
Opis:
In the past years, efforts in the field of Software Process Improvement were increasingly focusing on human aspects making one aware that people participating in the processes have a high impact on the success of any improvement. Applying the usability methodology to these problems is a promising new approach to dealing with the people issues in Software Process Improvement. This approach builds on the strengths of the usability perspective, most importantly its rich method library. One of these methods is the cognitive walkthrough method, used extensively by practitioners in software development projects.
Źródło:
e-Informatica Software Engineering Journal; 2015, 9, 1; 79-85
1897-7979
Pojawia się w:
e-Informatica Software Engineering Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reprodukcja majątku trwałego Zasobu Własności Rolnej Skarbu Państwa (na przykładzie oddziału terenowego AWRSP w Poznaniu w latach 1995-2002)
Reproduction of fixed assets of Agricultural Property Stocks of the State Treasury Assets in Lease [based on the Poznan regional branch of Agricultural Property Agency of the State Treasury in 1995-2002]
Autorzy:
Nowak, P B
Powiązania:
https://bibliotekanauki.pl/articles/43394.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Tematy:
amortyzacja
Zasob Wlasnosci Rolnej Skarbu Panstwa
Oddzial Terenowy AWRSP Poznan
majatek trwaly
Polska
transformacja gospodarki
dzierzawa
rozliczenia finansowe
nieruchomosci
rolnictwo
umorzenia
Agencja Wlasnosci Rolnej Skarbu Panstwa
Opis:
W artykule przedstawiono strukturę przejętego do Zasobu Własności Rolnej Skarbu Państwa majątku byłych ppgr, jego rozdysponowanie oraz skutki specyficznych zasad rozliczania amortyzacji i możliwości odtworzenia majątku. Podkreślono niekorzystne warunki odtworzenia majątku trwałego w dzierżawie.
As a result of privatization of the state-owned agriculture the substantial and diverse assets were transferred to the agricultural property stock of the State Treasury. The important part of it constituted fixed assets (buildings and structures). The accepted methods of fixed assets depreciation and forms of amortization do not ensure their regeneration (replacement). Particularly, it concerns the leased fixed assets. The Lessee is not interested in a regeneration of assets and the owner (State Treasury) provides for this purpose only a small amount of financial means.
Źródło:
Journal of Agribusiness and Rural Development; 2008, 8, 2; 69-80
1899-5241
Pojawia się w:
Journal of Agribusiness and Rural Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorithm for simultaneous parameter estimation of a multi-harmonic signal
Autorzy:
Petrović, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/221172.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
band-limited signals
fundamental frequency and Fourier coefficient estimation
signal reconstruction
finite-impulse-response (FIR) comb filter
Opis:
Estimating the fundamental frequency and harmonic parameters is basic for signal modelling in a power supply system. Differing from the existing parameter estimation algorithms either in power quality monitoring or in harmonic compensation, the proposed algorithm enables a simultaneous estimation of the fundamental frequency, the amplitudes and phases of harmonic waves. A pure sinusoid is obtained from an input multi-harmonic input signal by finite-impulse-response (FIR) comb filters. Proposed algorithm is based on the use of partial derivatives of the processed signal and the weighted estimation procedure to estimate the fundamental frequency, the amplitude and the phase of a multi-sinusoidal signal. The proposed algorithm can be applied in signal reconstruction, spectral estimation, system identification, as well as in other important signal processing problems. The simulation results verify the effectiveness of the proposed algorithm.
Źródło:
Metrology and Measurement Systems; 2012, 19, 4; 693-702
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Condition monitoring of wind turbines based on cointegration analysis of gearbox and generator temperature data
Diagnostyka turbiny wiatrowej w oparciu o analizę kointegracji sygnałów temperatury z przekładni oraz generatora
Autorzy:
Dao, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/329322.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
wind turbine
varying environmental conditions
operational conditions
condition monitoring
fault detection
cointegration
SCADA system
turbina wiatrowa
zmienne warunki środowiskowe
zmienne warunki eksploatacyjne
monitorowanie stanu
wykrywanie uszkodzeń
kointegracja
system SCADA
Opis:
This paper presents a cointegration-based method for condition monitoring of wind turbines. Analysis of cointegration residuals - obtained from cointegration process of wind turbine data - is used for operational condition monitoring and fault detection. The method has been employed for on-line condition monitoring of a wind turbine drivetrain with a nominal power of 2 MW under varying environmental and operational conditions using only the temperature data of gearbox bearing and generator winding, which were collected by the Supervisory Control and Data Acquisition (SCADA) system. The results show that the proposed method can effectively monitor the wind turbine and reliably detect the gearbox fault.
Artykuł przedstawia metodę kointegracji sygnałów do monitorowania stanu turbiny wiatrowej. Analiza wektorów resztkowych kointegracji wykorzystana została do monitorowania stanu turbiny wiatrowej o mocy nominalnej 2 MW. Diagnostykę turbiny wiatrowej przeprowadzono dla zmiennych warunków środowiskowych i eksploatacyjnych, tylko w oparciu o sygnały temperatury łożyska przekładni i uzwojenia generatora. Sygnały te zostały zgromadzone przez system sterowania, monitorowania oraz wizualizacji SCADA. Wyniki pokazują, że proponowana metoda może skutecznie monitorować turbinę wiatrową i niezawodnie wykryć uszkodzenie przekładni.
Źródło:
Diagnostyka; 2018, 19, 1; 63-71
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zagospodarowanie i odtwarzanie majątku Zasobu Własności Rolnej Skarbu Państwa w dzierżawie (na przykładzie Oddziału Terenowego AWRSP w Poznaniu w latach 1995-2002)
Maintenance and reproduction of fixed assets of Agricultural Property Stocks of the State Treasury assets in lease [based on the Poznan Regional Branch of Agricultural Property Agency of the State Treasury in 1995-2002]
Autorzy:
Nowak, P B
Powiązania:
https://bibliotekanauki.pl/articles/43846.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Tematy:
amortyzacja
Oddzial Terenowy AWRSP Poznan
stan uzytkowy
majatek trwaly
dzierzawa
zagospodarowanie
nieruchomosci
stan techniczny
umorzenia
Agencja Wlasnosci Rolnej Skarbu Panstwa
Opis:
Badaniami ankietowymi objęto 68 dzierżawców, gospodarujących na wydzierżawionych z OT AWRSP w Poznaniu gruntach o powierzchni 47,9 tys. ha oraz dzierżawiących majątek trwały o wartości początkowej około 317 mln zł. Zebrany materiał z badań obejmuje dane o 1807 budynkach Zasobu WRSP z lat 1995-2002. Wyniki badań wykazują, że wydzierżawiony majątek trwały był w większości zagospodarowany, ale reprodukowany w niskim stopniu (średni wskaźnik odtwarzania wynosił 68,8%), czyli nie była zapewniona jego tzw. reprodukcja prosta. Stopień jego reprodukcji był jednak znacznie wyższy niż średnio w kraju (43,5%).
As a result of privatization of the state-owned agriculture the substantial and diverse assets were transferred to the Agricultural Property Stock of the State Treasury. The important part of it constituted fixed assets (buildings and structures). The accepted methods of fixed assets depreciation and forms of amortization did not ensure their regeneration (replacement). Particularly, it concerns the leased fixed assets. The Leaseholders were not interested in a regeneration of assets and the owner (State Treasury) provided only a small amount of financial means for this purpose. The survey involved 68 leaseholders using the grounds of 47 900 hectares taken in lease from the Poznań RB of APAST and leasing fixed assets of the initial value of about 317 million zloty. The material involves data of 1807 buildings of the APAST assets from 1995 to 2002. The survey results show that the majority of the fixed assets in lease were in use but they were reproduced to a low degree (the average – 69%) and capital investment constituted about a half of the financial outlay. The rest of it was spent on reconstruction.
Źródło:
Journal of Agribusiness and Rural Development; 2008, 10, 4; 73-81
1899-5241
Pojawia się w:
Journal of Agribusiness and Rural Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hexammine Nickel Complex: Cooperative Rotation of Six NH$\text{}_{3}$ Groups
Autorzy:
Sczaniecki, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/1931836.pdf
Data publikacji:
1994-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.-v
Opis:
Electrostatic interactions between NH3 groups undergoing a correlated rotation are calculated with reference to the nickel hexammine complexes [Ni(NH$\text{}_{3}$)$\text{}_{6}$]$\text{}^{2+}$ The results demonstrate the angular dependence of the cis and trans arrangements of the model ammonia triangles. The previously defined four maxima and four minima are identified.
Źródło:
Acta Physica Polonica A; 1994, 86, 6; 1021-1026
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport and Magnetoresistance in Low Carrier Density Ferromagnets
Autorzy:
Littlewood, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/2011203.pdf
Data publikacji:
2000-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Pa
Opis:
In metallic magnets, scattering from magnetic fluctuations above and near T$\text{}_{C}$ may provide a substantial contribution to the electrical resistance ρ(T). However, this effect is usually small because the dominant fluctuations are near q ≈ 0, which does not produce substantial backscattering across the Fermi surface unless 2k$\text{}_{F}$ is itself small; such a situation can be realised in metallically-doped ferromagnetic semiconductors. A simple adaptation of the theory of deGennes and Friedel shows the low field magnetoresistance scales with the ratio of field induced magnetisation m(H) to the saturation magnetisation m$\text{}_{sat}$: Δρ/ρ ≈ C(m/m$\text{}_{sat}$)$\text{}^{2}$, where C ≈ x$\text{}^{-2}\text{}^{/}\text{}^{3}$ , with x the number of charge carriers per magnetic unit cell. Comparison to data on very different ferromagnetic metals and doped semiconductors is in broad quantitative agreement with this trend, with the prime exception of the perovskite manganese oxides, already understood to involve the extra physics of dynamic lattice distortions. At very low doping, the physics should involve ferromagnetic polarons, and polaron formation and transport are discussed.
Źródło:
Acta Physica Polonica A; 2000, 97, 1; 7-13
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cointegration method for temperature effect removal in damage detection based on Lamb waves
Wykrywanie uszkodzeń przy pomocy fal Lamba - kompensacja wpływu temperatury oparta o metodę kointegracji
Autorzy:
Dao, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/328179.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
structural health monitoring
Lamb waves
cointegration
temperature effect removal
wykrywanie uszkodzeń
konstrukcja
fale Lamba
kointegracja
kompensacja wpływu temperatury
Opis:
The paper presents an application of the cointegration technique for temperature effect removal in Lamb wave data. The method is based on the analysis of cointegration residuals and stationary statistical characteristics. The experimental results on Lamb wave responses from undamaged and damaged aluminium plates show that the cointegration process can remove undesired temperature effects and accurately detect damage.
Fale Lamba stosowane są do wykrywania uszkodzeń w konstrukcjach płytowych. Wpływ temperatury na amplitudę oraz fazę fal Lamba jest jedną z głównych przeszkód w powszechnym zastosowaniu tej metody w praktyce inżynierskiej. W pracy zastosowano metodę kointegracji do kompensacji wpływu temperatury na propagację fal Lamba. Metoda oparta jest na badaniu stacjonarności sygnałów. Zastosowane podejście pokazane jest na przykładzie wykrywania szczelin zmęczeniowych w płytach aluminiowych. Wyniki pokazują, że metoda kointegracji skutecznie usuwa z fal Lamba wszystkie efekty związane z wpływem temperatury, przyczyniając się do wykrycia badanych uszkodzeń.
Źródło:
Diagnostyka; 2013, 14, 3; 61-67
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of statistical process control for proper processing of the Fore-Sudetic Monocline copper ore
Autorzy:
Tasdemir, A.
Kowalczuk, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/110236.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
copper
upgrading
statistical process control
ARIMA model
Shewhart’s chart
autocorrelation
Opis:
The paper deals with Statistical Process Control (SPC) applied to three original and three generated variables of copper ore upgrading by flotation. The six variables were evaluated by the SPC charts based on industrial upgrading of copper ore data gathered during one month of operation in the form of copper content in feed, concentrate and tailing. The remaining three upgrading variables were concentrate yield, copper recovery in concentrate and non-copper components recovery in tailing. Although, all variables obeyed normal distribution, considerable autocorrelation was detected between observations for all variables. For this reason, the traditional Shewhart control charts, that assume the process data generated are normally and independently distributed, resulted in many of out-of-control points which may lead to wrong decisions regarding the control of process variables. The most suitable ARIMA time series models were determined for all variables to remove autocorrelations. The ARIMA(0,1,1) model was found the best for copper content in feed, copper content in concentrate, concentrate yield and non-copper components recovery in tailing, while the AR(1) model was suitable for copper content in tailing and copper recovery in concentrate.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 1; 249-264
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some remarks on attachment of a gas bubble to another phase both immersed in water
Autorzy:
Kowalczuk, P. B.
Drzymala, J.
Powiązania:
https://bibliotekanauki.pl/articles/110908.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydrophobicity
aquaoleophobicity
contact angle
liquid film
attachment
Opis:
In this paper the importance of definition of hydrophobicity and aquaoleophilicity in terms of contact angle as well as the properties of water films in flotation and oil agglomeration were briefly presented. It was shown that the hysteresis of contact angle for a considered system depends on the way of measurement and geometry of the system due to the presence of other that excess pressure and capillary forces and buffering properties of the capillary force. It was suggested that, the measured advancing and receding contact angles should be, when possible, recalculated into the Young (rest, equilibrium) contact angle. It was discussed that quartz is not a good model of hydrophilic surface because its contact angle with a gas phase in water is not zero and that a spontaneous attachment between highly hydrophobic materials such as hydrocarbons and Teflon in dynamic system, such as flotation, does not occur.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 147-154
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wavelet Analysis in EPR Spectroscopy
Autorzy:
Drzewiecki, A.
Sczaniecki, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/2043391.pdf
Data publikacji:
2005-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Kf
76.30.Rn
82.50.Kx
Opis:
Possibility of application of wavelet analysis in EPR spectroscopy is investigated. Basic mathematics of the method is summarized, with emphasis on the relation between EPR experiment and physical interpretation of wavelet transform. The fact that first derivative of the Lorentzian function can be used as a base wavelet is employed and the specific rules of the interpretation of the final wavelet synthesis are identified. Analysis of a sample EPR spectrum of X-ray irradiated guanidinium aluminium sulphate hexahydrate crystal is given as an example. Set of parameters resulting from the wavelet analysis is subsequently used to reconstruct/synthesize the original EPR spectrum. The method involves an opportunity of eliminating unwanted components of the multicomponent spectra. Generally, the method may supplement other means of data analysis, in particular, in magnetic resonance.
Źródło:
Acta Physica Polonica A; 2005, 108, 1; 73-79
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement Precision Under Repeatability Conditions of a Batch of Sound Power Assessment for Blenders in Reverberation Room
Autorzy:
Costa-Felix, R. P. B.
Powiązania:
https://bibliotekanauki.pl/articles/177133.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metrology
measurement precision
sound power assessment
reverberation room
Opis:
A set of sound power assessments was performed to determine measurement precision in specified conditions by the comparison method in a reverberation room with a fixed position array of six microphones. Six blenders (or mixers) and, complementary, a reference sound source were the noise sources. Five or six sound power calculations were undertaken on each noise source, and the standard deviation (sr) was computed as “measurement precision under repeatability conditions” for each octave band from 125 Hz to 8 kHz, and in dB(A). With the results obtained, values of sr equal 1.0 dB for 125 Hz and 250 Hz, 0.8 dB for 500 Hz to 2 kHz, and 0.5 dB for 4 kHz and 8 kHz. Those can be considered representative as sound power precision for blenders according to the measurement method used. The standard deviation of repeatability for the A-weighted sound power level equals 0.6 dB. This paper could be used for house or laboratory tests to check where their uncertainty assessment for sound power determination is similar or not to those generated at the National Metrology Institute.
Źródło:
Archives of Acoustics; 2016, 41, 3; 591-597
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tautomeria prototropowa związków organicznych
Prototropic tautomerism of organic compounds
Autorzy:
Rudnicki-Velasquez, P. B.
Krzymiński, K.
Powiązania:
https://bibliotekanauki.pl/articles/134752.pdf
Data publikacji:
2017
Wydawca:
ADVSEO
Tematy:
tautomerism of heterocyclic compounds
methods of tautomerism research
Opis:
Tautomerism is a phenomenon of existing of structural isomers of the compound, which are in balance with each other. The most common type of tautomerism associated with migration of hydrogen and redistribution of electron density is prototropic tautomerism. Tautomers generally differ significantly in physicochemical properties and reactivity. Researches on tautomeric balance were the subject of broad interest to biochemists. Several compounds exhibiting biological activity may in fact occur in more than one tautomeric form. It is recognized that tautomers plays an important role in the interaction with DNA molecules, processes transporting living matter, or the appearance of spontaneous mutations. Therefore, for many years the researches on this phenomenon have been conducted, both experimental and theoretical.
Źródło:
Technical Issues; 2017, 2; 23-28
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cyanobacteria microflora in a limestone spring (Troniny spring, Central Poland)
Autorzy:
Nowicka-Krawczyk, P.B.
Zelazna-Wieczorek, J.
Powiązania:
https://bibliotekanauki.pl/articles/57145.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Cyanoprokaryota
microflora
species composition
species richness
limestone spring
crenobiont
Troniny village
Central Poland
Opis:
The paper reports a study of cyanobacterial diversity in a cold-water limestone limnocrene in Central Poland. Samples were collected from 1998 to 2000 and in June 2012. The morphology, population characteristics and species composition of the cyanobacteria assemblages were investigated, and the frequency of taxa was recorded. The large number of taxa identified (30) reflects the microhabitat heterogeneity of this spring. Some species considered epiphytes grew on limestone rocks. The occurrence of the majority of the most frequent taxa was related to the physicochemical characteristics of the spring, but none of them can be considered obligatory crenobionts characteristic of limestone springs. The studied spring is a unique ecosystem with an interesting cyanobacteria microflora whose occurrence is attributable to the spring’s water chemistry, low temperature and variety of microhabitats.
Źródło:
Acta Societatis Botanicorum Poloniae; 2013, 82, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of frother type and dose on collectorless flotation of copper-bearing shale in a flotation column
Autorzy:
Kowalczuk, P. B.
Mroczko, D.
Drzymala, J.
Powiązania:
https://bibliotekanauki.pl/articles/109396.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
hydrophobicity
frother
shale
flotation column
Opis:
In this paper the influence of nonionic (methyl isobutyl carbinol, tri(ethylene glycol) monobutyl ether) and cationic (hexylamine) frothers on flotation of copper-bearing shale in a flotation column was investigated. It was shown that naturally hydrophobic shale did not float in pure water but it floated in the presence of the investigated frothers. The real contact angle of shale, measured by the sessile drop method, was equal to about 40°, while its effective contact angle was zero when shale was floated in a flotation column in pure water. The investigated surfactants increased the effective hydrophobicity of shale from zero to 16±1, 22±1 and 33±2° for coarse, medium and fine particles, respectively. The calculations of the effective contact angle were based on a simplified probabilistic model of flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 547-558
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic separation curves based on process rate considerations
Autorzy:
Drzymala, J.
Ratajczak, T.
Kowalczuk, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/110027.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
separation
flotation
kinetics
separation curves
process rate
Opis:
There are many graphical representations of separation results involving time as a crucial parameter determining the kinetics of a process. The graphical representations of results of separation are usually in the form of 2D plots relating two parameters which one of them is time. Time can also be utilized as a complex parameter such as a process rate. The plots involving time are called kinetic curves. Theoretically, the number of kinetic curves is infinite. The basic process kinetic curves, relating either yield (or recovery) and time can be modified to obtain numerous local and global efficiency curves. The global efficiency kinetic curves provide characteristic constants which do not change with the time and yield of a process. In this paper the local and global efficiency plots were created using experimental data which followed the so-called first order kinetics. It was shown that the integral 1st order kinetic equation provided the kinetic constant k which was numerically identical with the 1st order specific rate v, while their units were different (k, 1/min; v, %/(%·min). The global efficiency parameters plotted versus the maximum yield provided another type of plot, which can be called the limits kinetic curve. The limits kinetic curves are very useful for characterizing, quantification and classification of separation systems. The limits kinetic curves can be normalized providing one universal curve with a characteristic point, for instance, v50 indicating the specific rate (or kinetic) constant at the maximum recovery equal to 50%. The mathematical equation of the normalized limits kinetic curve was given in the paper.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 983-995
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwość szybkiej identyfikacji szczepów rodzaju Staphylococcus i Micrococcus pochodzacych z różnych materiałów klinicznych
Vozmozhnost bystrojj identifikacii shtammov stafilokokkov i mikrokokkov iz raznykh klinicheskikh materialov
Possibility of rapid identification of strains of Staphylococcus and Micrococcus derived from different clinical materials
Autorzy:
Kasprowicz, A.
Heczko, P.B.
Białecka, A.
Powiązania:
https://bibliotekanauki.pl/articles/2187902.pdf
Data publikacji:
1985
Wydawca:
Polskie Towarzystwo Diagnostyki Laboratoryjnej
Źródło:
Diagnostyka Laboratoryjna; 1985, 21, 4-5; 236-241
0867-4043
Pojawia się w:
Diagnostyka Laboratoryjna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial and Temporal Variability of Moisture Condition in Soil-Plant Environment using Spectral Data and Gis Tools
Autorzy:
Grzywna, H.
Dąbek, P. B.
Olszewska, B.
Powiązania:
https://bibliotekanauki.pl/articles/123280.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
drought
soil moisture
NDVI
Sentinel-2
satellite data
remote sensing
Opis:
The studies on agricultural droughts require long-term atmospheric, hydrological and meteorological data. On the other hand, today, the possibilities of using spectral data in environmental studies are indicated. The development of remote sensing techniques, increasing the spectral and spatial resolution of data allows using remote sensing data in the study of water content in the environment. The paper presents the results of the analysis of moisture content of soil-plant environment in the lowland areas of river valley using the spectral data from Sentinel-2. The analyses were conducted between February and November 2016. The spectral data were used to calculate the Normalize Differential Vegetation Index (NDVI) which provided the information about the moisture content of the soil-plant environment. The analyses were performed only on grasslands, on 22 objects located in the research area in the Oder river valley between Malczyce and Brzeg Dolny, Poland. The NDVI values were correlated with the hydrological and meteorological parameters. The analyses showed spatial and temporal variability of the moisture conditions in the soil-plant environment showed by the NDVI variability and existence some relationships between the climatic and spectral indices characterizing the moisture content in the environment.
Źródło:
Journal of Ecological Engineering; 2018, 19, 6; 56-64
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wzajemnych związków ekologicznych żywicieli pasożyta jako metoda badań ognisk difylobotriozy
Ekological relationship of host as a method of investigations of diphyllobothriosis
Analiz ehkologicheskikh vzaimosvjazejj khozjaev parazita kak metod issledovanija ocharov difillobotriozov
Autorzy:
Czizowa, T.P.
Gofman-Kadosznikow, P.B.
Powiązania:
https://bibliotekanauki.pl/articles/838910.pdf
Data publikacji:
1961
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Annals of Parasitology; 1961, 07, 1
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wzajemnych związków ekologicznych żywicieli pasożyta jako metoda badań ognisk difylobotriozy
Ekological relationship of host as a method of investigations of diphyllobothriosis
Analiz ehkologicheskikh vzaimosvjazejj khozjaev parazita kak metod issledovanija ocharov difillobotriozov
Autorzy:
Cziżowa, T.P.
Gofman-Kadosznikow, P.B.
Powiązania:
https://bibliotekanauki.pl/articles/2179834.pdf
Data publikacji:
1961
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1961, 07, 1; 43-50
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A literature review of electronic data interchange as electronic business communication for manufacturing
Autorzy:
Yunitarini, R.
Pratikto, -
Santoso, P. B.
Sugiono, -
Powiązania:
https://bibliotekanauki.pl/articles/952865.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electronic data interchange
communication
manufacture
business
Opis:
In the present dynamic environment, manufacture are required to reduce product development cycle time and enhance product quality. To meet such challenges many business are developing closer relationships with their business partner through application of interorganisational system. Electronic data interchange (EDI) providing a structured form of communication and has become very popular vehicle for electronic communication. Since the EDI concept was popularised in 1990, there is a growing recognition by practitioners and academics. The aim of this study is to perform an analysis of EDI research, give the current discussion regarding the trends and note the suggestions for the future directions of EDI research in the manufacture. In this paper, we provide a wide coverage of excessively citations on EDI from 1990 to 2017 from good references in this area. The papers are classified into EDI implementation strategy, EDI adoption, EDI integration, EDI in supply chain and EDI in small and medium enterprises (SMEs). The study results of this literature review are expected to assist development of EDI research especially the implementation of EDI on production outsourcing as one of supply chain activities.
Źródło:
Management and Production Engineering Review; 2018, 9, 4; 117-128
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface roughness in bubble attachment and flotation of highly hydrophobic solids in presence of frother – experiment and simulations
Autorzy:
Kosior, D.
Kowalczuk, P. B.
Zawala, J.
Powiązania:
https://bibliotekanauki.pl/articles/109319.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
surface roughness
attachment
flotation
kinetics
frother
Opis:
In this paper, the kinetic of the three-phase contact (TPC) formation and the flotation recovery of highly hydrophobic solids with different surface roughness were studied in pure water and aqueous solutions of n-octanol. The surface roughness varied between 1 to 100 μm. It was found that there was a strong influence of surface roughness on both kinetics of TPC formation and flotation. The time of three phase contact formation and flotation rate were much faster for rough surfaces in both water and aqueous solutions of frother. Irrespective of the surface roughness, at above a certain frother dose, the attachment time increased and the flotation rate decreased. It was related to the presence of air at the hydrophobic solid surfaces. The mechanism of this prolongation of the time of TPC formation at the solid surfaces with different roughness due to the frother overdosage was discussed, and the experimental data were confirmed by numerical simulations.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 1; 63-72
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oil agglomeration of metal-bearing shale in the presence of mixed cationic-anionic surfactants
Autorzy:
Polowczyk, I.
Kruszelnicki, M.
Kowalczuk, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/110617.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption
zeta potential
synergism
surfactants
kerosene
hydrophobic coagulation
Opis:
This paper reports oil agglomeration of fine metal-bearing shale particles in the presence of cationic (dodecylamine hydrochloride) and anionic (sodium dodecyl sulfate) surfactants and their mixture. The experimental results demonstrated that there was a strong relationship between zeta potential, hydrophobic coagulation, oil agglomeration and particle hydrophobicity in the presence of cationic surfactant, whereas shale neither coagulated nor agglomerated in the presence of anionic surfactant. Addition of either anionic or cationic surfactant in emulsification of a bridging oil increased the size of agglomerates and reduced the concentration of surfactant used in the suspension. The results pointed to synergism between cationic and anionic surfactants in oil agglomeration. Based on the results obtained from this study, the mechanism of oil agglomeration of shale in the presence of ionic surfactants and their mixture was elucidated.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1052-1059
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and development of 3-stage determination of damage location using Mamdani-Adaptive Genetic-Sugeno model
Autorzy:
Sahu, S.
Kumar, P. B.
Parhi, D. R.
Powiązania:
https://bibliotekanauki.pl/articles/281979.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
damage
Mamdani FIS
Sugeno FIS
Adaptive Genetic Algorithm
vibration
natural frequencies
Opis:
Damage detection in structural elements like beams is one of important research areas for health monitoring. Initiation of a fault in the form of a crack or any damage puts a limitation on the service life of a structural member. So, in this paper, a method is proposed which uses the advantages of soft computing techniques like Fuzzy Inference Systems (Mamdani and Sugeno) and Adaptive Genetic Algorithm for three stage refinement of the data base generated using dynamic responses from a cracked fixed-free aluminum alloy beam element. For the crack element reference, a finite element model of a single transverse crack has been considered. The proposed method describes both Mamdani and Sugeno Fuzzy Inference Systems for training of damage parameters. In the Adaptive Genetic Algorithm, a statistics based method has been incorporated to limit the randomness of the search process. Finally, the results from the Mamdani-Adaptive Genetic-Sugeno model (MAS) are validated with the results from the experimental analysis.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1325-1339
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and surface energy of both fluorite halves after cleaving along selected crystallographic planes
Autorzy:
Janicki, M. J.
Drzymala, J.
Kowalczuk, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/110167.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fluorite
fluoride
surface energy
interfacial energy
cleaving
reorganization
surface ions
Opis:
The density functional theory, supported with a commercial software, was used to compute the geometry and surface energy of fluorite cleaved along the (111), (110) and (100) planes. In the case of cleaving a piece of fluorite along the (111) plane the two newly created surfaces are identical consisting of fluorite ions with the surface energy equal to 0.384 J/m2. Cleaving fluorite along the (110) plane also provides identical halves and, both contain one Ca ion next to two F ions, with the surface energy equal to 0.723 J/m2. When cleaving takes place along the (100) plane, it creates two corresponding halves with different surface structures. One half, having only surface Ca ions (100Ca) has the surface energy equal to 0.866 J/m2, while the surface energy of the second half, having only F surface ions (100F), is 0.458 J/m2. Different structures and energies of the corresponding fluorite surfaces, that is (100Ca) and (100F) planes, should have an impact on their chemical properties, including hydrophobicity expressed by contact angle. The calculations performed in the paper also showed that reorganization of fluorite surfaces after cleaving was insignificant for all of the investigated planes.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 451-458
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Navigation of humanoids by a hybridized regression-adaptive particle swarm optimization approach
Autorzy:
Kumar, P. B.
Sahu, C.
Parhi, D. R.
Powiązania:
https://bibliotekanauki.pl/articles/229923.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
navigation
humanoid NAO
RA
APSO
Petri-Net
V-REP
Opis:
In the era of humanoid robotics, navigation and path planning of humanoids in complex environments have always remained as one of the most promising area of research. In this paper, a novel hybridized navigational controller is proposed using the logic of both classical technique and computational intelligence for path planning of humanoids. The proposed navigational controller is a hybridization of regression analysis with adaptive particle swarm optimization. The inputs given to the regression controller are in the forms of obstacle distances, and the output of the regression controller is interim turning angle. The output interim turning angle is again fed to the adaptive particle swarm optimization controller along with other inputs. The output of the adaptive particle swarm optimization controller termed as final turning angle acts as the directing factor for smooth navigation of humanoids in a complex environment. The proposed navigational controller is tested for single as well as multiple humanoids in both simulation and experimental environments. The results obtained from both the environments are compared against each other, and a good agreement between them is observed. Finally, the proposed hybridization technique is also tested against other existing navigational approaches for validation of better efficiency.
Źródło:
Archives of Control Sciences; 2018, 28, 3; 349--378
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intelligent hybrid fuzzy logic system for damage detection of beam-like structural elements
Autorzy:
Sahu, S.
Kumar, P. B.
Parhi, D. R.
Powiązania:
https://bibliotekanauki.pl/articles/281457.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
fuzzy logic
differential evolution algorithm
crack
natural frequency
Opis:
Fuzzy logic has been used in different research fields for more than three decades. It has become a robust method to solve complex and intricate problems which are otherwise difficult to solve by traditional methods. But it still requires some human experience and knowledge. In the present study, an attempt is made to design a hybrid optimization technique for automatic formation of the fuzzy knowledge based rules using an evolutionary algorithm. This hybridization technique has been applied in the field of damage detection and location of cracks in cracked structural elements. In this paper, a robust fault diagnostic tool based on a differential evolution algorithm and fuzzy logic has been proposed. Theoretical and Finite Element analyzes are done to model the crack and to find the effect of the presence of cracks on changes of vibrational characteristic (natural frequencies) of a fixed-fixed beam. The inputs to DEA-FL system are the first three relative natural frequencies, and the outputs from the system are the relative crack depth and relative crack location. For the validation of the results obtained from the proposed method and to check the robustness of the controller, experimental analysis is performed. To find average error rates, the bootstrap method has been adopted.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 509-521
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Size/Strain Diffraction Peak Broadening of the Energetic Materials FOX-7, RDX and ADN
Autorzy:
Herrmann, M.
Forter-Barth, U.
Kempa, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/358820.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
X-ray diffraction
microstructure
FOX-7
RDX
ADN
Opis:
X-ray powder diffraction (XRD) is an established tool for the investigation of energetic materials. Whereas positions and intensities of diffraction peaks yield information on the crystal structure, peak profles are related to the real structure described by crystallite size, shape and microstrain. A series of energetic materials were measured at the synchrotron ANKA, and the size/strain broadening of FOX-7, RDX and ADN is discussed in relation to crystal structures and properties.
Źródło:
Central European Journal of Energetic Materials; 2009, 6, 2; 183-193
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany technologiczne w uprawie kukurydzy pastewnej a jej zachwaszczenie i plonowanie
Technological changes in fodder maize cultivation in relation to weed infestation and yield
Autorzy:
Stupnicka-Rodzynkiewicz, E.
Lepiarczyk, A.
Malounguidi, P.B.
Powiązania:
https://bibliotekanauki.pl/articles/802370.pdf
Data publikacji:
1997
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
kukurydza pastewna
uprawa roslin
technologia uprawy
zmiany technologiczne
zachwaszczenie
plonowanie
przedplony
plodozmian kukurydziano-zbozowy
uprawa roli
gleboszowanie
Opis:
Maize was cultivated in five field cereal-maize crop rotation with: fodder maize, fodder maize, spring barley, oat and winter wheat. In 1991-1995 the weed infestation and level of maize yield were investigated in relation to applied herbicides, forecrop and with application or omission of deep ploughing. The kind of applied herbicides affected significantly both the weed infestation and yields. Deep ploughing diminished the weed infestation on an average by ca. 12% but it did not influence maize yields. No significant effect of forecrop on the studied parametres was found.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 1997, 439
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In search of an efficient frother for pre-flotation of carbonaceous shale from the kupferschiefer stratiform copper ore
Autorzy:
Kowalczuk, P. B.
Buluc, B.
Sahbaz, O.
Drzymala, J.
Powiązania:
https://bibliotekanauki.pl/articles/109705.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
frother
pre-flotation
copper ore
shale
Opis:
This papers shows that frothers such as aliphatic alcohols (CnH2n+1OH), poly(propylene glycols) (HO(C3H6O)mH), poly(propylene glycol) alkyl ethers (CnH2n+1O(C3H6O)mH) and poly(ethylene glycol) alkyl ethers (CnH2n+1O(C2H4O)mH), can be used for collectorless flotation of a sample of carbonaceous copper shale manually separated from the Kupferschiefer stratiform copper ore. It was shown that flotation is influenced by the type and dose of frothers. The best flotation results were obtained with tri(propylene glycol) butyl ether C4P3, tri(propylene glycol) propyl ether C3P3 and tri(propylene glycol) P3. For these frothers, the yield vs. frother dose relationship was in the form of convex curves indicating that carbonaceous copper shale can float at relatively low dosages of the frother. It means that these frothers can be used for pre-flotation of carbonaceous matter from the investigated copper ore. Other frothers formed concave yield–frother dose relationships and were less effective.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 835-840
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ dodatku włókien naturalnych na wybrane właściwości mechaniczne wyprasek biopolimerowych
Influence of natural fibres addition on selected mechanical properties of biopolimers sampels
Autorzy:
Oniszczuk, T.
Janssen, L. P. B. M.
Mościcki, L.
Powiązania:
https://bibliotekanauki.pl/articles/291129.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
skrobia termoplastyczna
ekstruzja
właściwości mechaniczne
wtrysk wysokociśnieniowy
wtryskarka
ekstruder
thermoplastic starch
extrusion
mechanical properties
injection mold
injection moulding machine
extruder
Opis:
W pracy przedstawiono rezultaty badań właściwości mechanicznych materiałów biodegradowalnych uzyskanych ze skrobi termoplastycznej z wykorzystaniem techniki ekstruzji i wtrysku wysokociśnieniowego. Badano wpływ dodatku włókien lnianych i celulozowych na właściwości mechaniczne produktu uzyskanego z mieszanki skrobi z gliceryną. Badania właściwości mechanicznych próbek przeprowadzono na urządzeniu Zwick typ BDO-FBO0,5TH przy prędkości przesuwu głowicy 3mm/min. Miejsca przerwań próbek były analizowane w świetle spolaryzowanym za pomocą mikroskopu optycznego w celu określenia związania materiału z włóknami.
The paper presents the results of studies on the mechanical properties of biodegradable thermoplastic starch obtained by the extrusion and injection moulding methods. Especially the influence of flax and cellulose fibre percentage with 20% of glycerol (plasticizer) and on the mechanical properties of the obtained material was tested. The tests on specimens mechanical properties were performed on Zwick model BDO-FBO0,5TH. The samples were analysed using polarized light microscopy.
Źródło:
Inżynieria Rolnicza; 2006, R. 10, nr 6(81), 6(81); 101-107
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemical and ecological aspects of lower Frasnian pyrite-ammonoid level at Kostomłoty (Holy Cross Mountains, Poland)
Autorzy:
Racki, G.
Piechota, A.
Bond, D.
Wignall, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/2060630.pdf
Data publikacji:
2004
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Holy Cross Mountains
Frasnian
pyritic fossils
geochemical proxies
anoxia
Timan Event
Opis:
The lower Frasnian (transitans Zone with Ancyrodella priamosica = MN 4 Zone) rhythmic basin succession of marly limestones and shales (upper Szydłówek Beds) at Kostomłoty, western Holy CrossMts., Central Poland, contains a record of the transgressive-hypoxic Timan Event in this drowned part of southern Laurussian shelf. The unique facies consists of organic-rich marly shales and a distinctive pyritic, goniatite level, 1.6mthick. The faunal assemblage is dominated by pyritized shells of diminutivemollusks with cephalopods (including goniatites Epitornoceras and Acanthoclymenia), buchioline bivalves (Glyptohallicardia) and styliolinids. This interval is marked by moderately low Th/U ratios and pyrite framboid size distributions suggestive of dysoxic rather than permanent euxinic conditions. The scarcity of infauna and bioturbation resulted in finely laminated sedimentary fabrics, as well as the low diversity of the presumed pioneer benthos (mostly brachiopods). In the topmost part of the Szydłówek Beds, distinguished by the Styliolina coquina interbedded between limestone-biodetrital layers, the above geochemical proxies and C-isotope positive shift indicate a tendency to somewhat increased bottom oxygen deficiency and higher carbon burial rate linked with a bloom of pelagic biota during high-productivity pulse. The geochemical and community changes are a complex regional record of the initial phase of a major perturbation in the earth-ocean system during a phase of intermittently rising sea level in the early to middle Frasnian, and associated with the highest positive C-isotope ratios of the Devonian.
Źródło:
Geological Quarterly; 2004, 48, 3; 267--282
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling spatial aspects of mobile channel for low antenna height environments
Autorzy:
Simsim, M. T.
Khan, N. M.
Rapajic, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/309429.pdf
Data publikacji:
2006
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Gaussian distributions
geometric modeling
multi-path channels
scattering
Opis:
It is essential to have deep understanding of the mobile radio channel in particular for radio communication modeling and advanced technology system design. Models for the mobile radio channel are vital for the study of smart antenna systems, both for the design of algorithms, system-testing purposes, and for network planning. This paper provides an intensive study of the spatial characteristics of the mobile channel for low antenna height cellular environments, i.e., picocells and microcells, assuming Gaussian distributed scatterers. We investigate previous work on the angle of arrival (AoA) statistics for Gaussian distributed scatterers and make appropriate comments. Further, we employ the recently proposed eccentro-scattering physical channel model, as a generalized model, to derive the probability density function (pdf) of AoA of the multipaths at base station (BS) assuming Gaussian distributed scatterers around both BS and mobile station (MS). We found that the pdf of AoA at BS is directly affected by the standard deviation of the scatterers' density and the size of the scattering disc. The derived formulas, in closed form, can be used further for performance assessment of smart antennas and beamwidth design purposes.
Źródło:
Journal of Telecommunications and Information Technology; 2006, 2; 97-105
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flow dependence of factor X activation by tissue factor - factor VIIa
Autorzy:
Contino, P B
Andree, H.A.M.
Nemerson, Y.
Powiązania:
https://bibliotekanauki.pl/articles/70623.pdf
Data publikacji:
1994
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
flow dependence
tissue factor
Źródło:
Journal of Physiology and Pharmacology; 1994, 45, 1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Social support change as a moderator and organizational commitment as a mediator between pre-entry expectation and turnover intention : a study among life insurance agents in Tianjin, China
Zmiana wsparcia społecznego jako moderator i oddanie organizacyji jako mediator między wstępnymi oczekiwaniami i chęcią zmiany : studium wśród agentów ubezpieczeń na życie w Tianjin, Chiny
Autorzy:
Hao, L.
Arsiah, B.
Awangku, H. B. P. B.
Powiązania:
https://bibliotekanauki.pl/articles/406196.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska
Tematy:
organizational commitment
PLS-SEM
R
social support change
turnover intention
oddanie organizacji
modelowanie równań częściowych najmniejszych kwadratów
zmiana wsparcia społecznego
chęć zmiany
Opis:
The study intents to understand the social support change's moderation effect and organizational commitment’s mediation effects between the relationships of pre-entry expectation and turnover intention among the life insurance agents in Tianjin, China. Partial least squares structural equation modelling (PLS-SEM) was employed as the method of the analysis. Statistical environment R version 3.1.0 was used as the tool of analysis. Six of seven hypotheses were accepted. As the result, perceived performance is more determinative than pre-entry expectation of defining confirmation of expectation. Organizational commitment is more important than post-entry satisfaction when employees making decision of staying. High composite reliability needs to be investigated whether caused by the life insurance agents’ job nature or the poor content validity of the instrument. Original value of paper: The paper applies expectation confirmation theory into human resource context.
Celem badania jest zrozumienie efektu moderacji pomocy społecznej i efektów pośrednictwa zaangażowania organizacji między relacjami oczekiwań przed wejściem do obrotu a zamiarem obrotu wśród agentów ubezpieczeniowych na życie w Tianjin, w Chinach. Jako metodę analizy wykorzystano modelowanie równań częściowych najmniejszych kwadratów (ang. Partial least squares structural equation modelling, PLS-SEM). Jako narzędzie analizy wykorzystano środowisko statystyczne R wersja 3.1.0. Sześć z siedmiu hipotez zostało zaakceptowanych. W rezultacie, postrzegana wydajność jest bardziej rozstrzygająca niż oczekiwania dotyczące zdefiniowania potwierdzenia oczekiwania. Zobowiązanie organizacyjne jest ważniejsze niż zadowolenie z pracy, gdy pracownicy decydują o pozostaniu. Niezbędne jest zbadanie wysokiej złożonej niezawodności, niezależnie od tego, czy jest to spowodowane charakterem pracy lub brakiem użyteczności instrumentu. Oryginalne osiągnięcie artykułu: W artykule przedstawiono teorię potwierdzania oczekiwania (ang. expectation confirmation theory) w kontekście zasobów ludzkich.
Źródło:
Polish Journal of Management Studies; 2017, 15, 2; 58-68
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compound invariants and embeddings of Cartesian products
Autorzy:
Chalov, P. A.
Djakov, P. B.
Zahariuta, V. P.
Powiązania:
https://bibliotekanauki.pl/articles/1216224.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
isomorphic classification
Köthe spaces
Opis:
New compound geometric invariants are constructed in order to characterize complemented embeddings of Cartesian products of power series spaces. Bessaga's conjecture is proved for the same class of spaces.
Źródło:
Studia Mathematica; 1999, 137, 1; 33-47
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence ofĝ Tensor Anisotropy in (tm-p-PD):Chloranil, Charge Transfer Complex Powders
Autorzy:
Grampp, G.
Sczaniecki, P. B.
Żurek, S.
Bednarski, W.
Powiązania:
https://bibliotekanauki.pl/articles/2043604.pdf
Data publikacji:
2005-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Rn
Opis:
The powders of 2,3,5,6-tetramethyl-p-phenylenediamine:chloranil charge transfer complex were studied by EPR. Numerical pack EPR-NMR was used to simulate and fit the X-band experimental data in the temperature range of 119-298 K. Very good agreement between the experiment and simulations permits to obtain the main values ofĝ matrix and plot their temperature dependence. At 150 K the main g values are g$\text{}_{xx}$=g$\text{}_{yy}$=2.0041 and g$\text{}_{zz}$=2.0015. g splitting factor varies significantly with temperature and shows an anomaly near 200 K. The signal narrows with the temperature increase, which agrees with the earlier observation. Individual component linewidth, used in the simulation is anisotropic and amounts to 0.1-0.8 mT; which is reasonable when compared with those measured earlier for the single crystals of p-phenylenediamine:chloranil, where the narrowest lines are quoted to be 18μT.
Źródło:
Acta Physica Polonica A; 2005, 108, 2; 317-321
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy aspects in food extrusion-cooking
Autorzy:
Janssen, L.P.B.M.
Moscicki, L.
Mitrus, M.
Powiązania:
https://bibliotekanauki.pl/articles/25316.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
food extruder
raw material
energy balance
mechanical energy
extrusion-cooking
food extrusion-cooking
vegetable
energy
Źródło:
International Agrophysics; 2002, 16, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przetwórstwo skrobi termoplastycznej na cele opakowaniowe
Processing of the thermoplastic starch for packaging application
Autorzy:
Mościcki, L.
Janssen, L. P. B. M.
Mitrus, M.
Powiązania:
https://bibliotekanauki.pl/articles/291137.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
skrobia termoplastyczna
własności mechaniczne
ekstruzja
thermoplastic starch
mechanical properties
extrusion
Opis:
W wielu ośrodkach badawczych na całym świecie poszukuje się nowych, przyjaznych dla środowiska, biodegradowalnych materiałów opakowaniowych. Jednym z budzących wiele nadziei materiałów jest skrobia termoplastyczna. W niniejszej pracy publikowane są wyniki badań wybranych własności fizycznych skrobi termoplastycznej wytworzonej za pomocą techniki ekstruzji.
New biodegradable materials for packaging application are researching in many scientific centres. Thermoplastic starch seems to be a perfect solution. Chosen results of the research of physical properties of the thermoplastic starch are presented in this paper.
Źródło:
Inżynieria Rolnicza; 2006, R. 10, nr 6(81), 6(81); 65-72
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The model relationship of wastes for parameter design with green lean production of fresh water
Autorzy:
Tamjidillah, M.
Pratikto, Pratikto
Santoso, P.B.
Sugiono, Sugiono
Powiązania:
https://bibliotekanauki.pl/articles/905921.pdf
Data publikacji:
2017
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Scientific Review Engineering and Environmental Sciences; 2017, 26, 4[78]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2D Cadastral Coordinate Transformation using extreme learning machine technique
Autorzy:
Ziggah, Y. Y.
Issaka, Y.
Laari, P. B.
Hui, Z.
Powiązania:
https://bibliotekanauki.pl/articles/145372.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transformacja współrzędnych
sieci neuronowe
dane geodezyjne
sieć radialna
coordinate transformation
extreme learning machine
backpropagation neural network
radial basis function neural network
geodetic datum
Opis:
Land surveyors, photogrammetrists, remote sensing engineers and professionals in the Earth sciences are often faced with the task of transferring coordinates from one geodetic datum into another to serve their desired purpose. The essence is to create compatibility between data related to different geodetic reference frames for geospatial applications. Strictly speaking, conventional techniques of conformal, affine and projective transformation models are mostly used to accomplish such task. With developing countries like Ghana where there is no immediate plans to establish geocentric datum and still rely on the astro-geodetic datums as it national mapping reference surface, there is the urgent need to explore the suitability of other transformation methods. In this study, an effort has been made to explore the proficiency of the Extreme Learning Machine (ELM) as a novel alternative coordinate transformation method. The proposed ELM approach was applied to data found in the Ghana geodetic reference network. The ELM transformation result has been analysed and compared with benchmark methods of backpropagation neural network (BPNN), radial basis function neural network (RBFNN), two-dimensional (2D) affine and 2D conformal. The overall study results indicate that the ELM can produce comparable transformation results to the widely used BPNN and RBFNN, but better than the 2D affine and 2D conformal. The results produced by ELM has demonstrated it as a promising tool for coordinate transformation in Ghana.
Źródło:
Geodesy and Cartography; 2018, 67, 2; 321-343
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł

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