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Wyświetlanie 1-15 z 126
Tytuł:
Similarity of different lifting techniques in trunk muscular synergies
Autorzy:
Mirakhorlo, M.
Azghani, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/306737.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
mięśnie
synergia
optymalizacja
dynamika odwrotna
trunk muscle synergies
lifting techniques
optimization
inverse dynamics
Opis:
Lifting is known to be a major reason for musculoskeletal injuries. In this way, lifting has a crucial effect on human musculoskeletal system and intensity of this impact depends slightly on the selection of techniques. Underlying mechanisms by which trunk muscles are executed during performing lifting are central to biomechanical study of lifting techniques. In the current study, the trunk muscular control mechanisms of lifting are investigated using the synergetic control analysis. Non-negative matrix factorization has been used to extract trunk muscles synergies from their activities – which are computed by a previously validated musculoskeletal model – during different lifting techniques aimed to investigate motor control strategies. Three lifting techniques are considered; stoop, squat and semi-squat. Three synergies account for variety among muscle activation of trunk muscles with related VAF (Variability Account For) of over 95%. Trunk muscle synergy weightings and related time-varying coefficients are calculated for each kind of lifting techniques considering three synergies. Paired correlation coefficients between muscle synergies are all greater than 0.91 (P < 0.05) suggesting that trunk muscle synergies are similar for examined techniques in spite of their kinematic diversity. This similarity can be a result of their common ultimate goal. The acquired results also elucidate the mechanisms of muscle activation patterns that can be exploited in future studies and ergonomic interventions.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 4; 21-29
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of AlGaN/GaN heterostructures for sensor applications
Autorzy:
Hojko, M R
Paszuk, D
Paszkiewicz, B
Powiązania:
https://bibliotekanauki.pl/articles/174545.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sensor
AlGaN/GaN heterostructure
electrolyte
two-dimensional electron gas (2DEG)
pH
Opis:
In the paper, the behavior of AlGaN/GaN HEMT-type heterostructures in a water solution of (KOH + HCl) with differing pH was studied. The influence of the electrolyte pH on channel pinch-off voltage was measured using impedance spectroscopy methods. It was observed that the change of the pH of electrolyte has a strong effect on the pinch-off voltage of AlGaN/GaN HEMT-type heterostructures independently of the concentration of other ions. In high-pH environment the so-called memory effect of heterostructures was revealed. Its possible origin was discussed. A general theory to explain all results was proposed.
Źródło:
Optica Applicata; 2013, 43, 1; 35-38
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bubble loading profiles in a flotation column
Autorzy:
Eskanlou, A.
Khalesi, M. R.
Abdollahy, M.
Powiązania:
https://bibliotekanauki.pl/articles/110702.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bubble loading
flotation column
profile
collection zone height
Opis:
Bubble loading is the mass of hydrophobic particles attached per unit surface area of air. This measure can be used in the design and analysis of flotation columns as a sign of true flotation. To date, however, this measurement has been limited to the pulp-froth interface, which only indicates the maximum bubble loading and does not reflect the progress of the loading process. This paper introduces the concept of bubble loading profile that summarizes measures of bubble loading at different heights of the collection zone in a flotation column. The effects of bubble size, particle size and collector dosage on the introduced profiles are also investigated. These operational variables changed the bubble loading profile from a linear to a curved trend. The curvatures in the profiles were near the place of the feeding port and therefore the collection zone was divided into two separate zones in terms of bubble loading characteristics. The zone below the feeding port often did not contribute much to the loading of particles on the bubbles and the loading phenomenon mostly took place above the feeding port. Behaviors of the profiles in these two zones were analyzed to reveal that a change in the feeding port placement or column height can, under some conditions, increase the overall bubble loading and thus, ultimately, the true flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 355-362
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantifying the spreading factor to compare the wetting properties of minerals at molecular level – case study: sphalerite surface
Autorzy:
Mohseni, M.
Abdollahy, M.
Poursalehi, R.
Khalesi, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/109377.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wettability
contact angle
molecular simulation
sphalerite
spreading factor
Opis:
Spreading of water droplet on sphalerite surface was quantified at molecular level and was utilized for comparison of the wetting properties of sphalerite protonated and hydroxylated surfaces. Molecular dynamic simulations were used to characterize the wetting of sphalerite (110) plane. Experimental contact angles of water droplet on sphalerite surfaces were measured and the results were compared with simulated contact angles to ensure that the simulations are accurate enough for calculation of spreading factors. Shape descriptors such as perimeter, area, Feret’s diameters and circularity were used to characterize the shape of droplet-sphalerite interface at molecular level. Using the shape descriptors, different spreading factors were defined and calculated spreading factors were correlated with simulated contact angle. It was shown that spreading factors which were defined as the volume of water droplet divided by the area and Feret’s diameters, with correlation coefficient of 0.98 and 0.97, can be used as accurate tools for wetting comparison of functionalized sphalerite surface at molecular scale. Proposed approach also can be used for investigations on the effect of surface chemical and physical anisotropies on preferred wetting in specific direction at molecular scales.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 646-656
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and assessment of a single pile subjected to lateral load
Autorzy:
Abbas, J. M.
Chik, Z.
Taha, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/178422.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
piles
lateral response
slenderness ratio
flexural rigidity
3D FE analysis
Opis:
A three-dimensional finite element technique was used to analyse single pile lateral response subjected to pure lateral load. The main objective of this study is to assess the influence of the pile slenderness ratio on the lateral behaviour of single pile. The lateral single pile response in this assessment considered both lateral pile displacement and lateral soil resistance. As a result, modified p-y curves for lateral single pile response were improved when taking into account the influence lateral load magnitudes, pile cross sectional shape and flexural rigidity of the pile. The finite element method includes linear elastic, Mohr-Coulomb and 16-nodes interface models to represent the pile behaviour, soil performance and interface element, respectively. It can be concluded that the lateral pile deformation and lateral soil resistance because of the lateral load are always influenced by lateral load intensity and soil type as well as a pile slenderness ratio (L/D). The pile under an intermediate and large amount of loading (in case of cohesionless soil) has more resistance (low lateral displacement) than the pile embedded on the cohesion soil. In addition, it can be observed that the square-shaped pile is able to resist the load by about 30% more than the circular pile. On the other hand, pile in cohesionless soil was less affected by the change in EI compared with that in cohesive soil.
Źródło:
Studia Geotechnica et Mechanica; 2018, 40, 1; 65-78
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In-situ nitrate remediation using nano iron/nickel particles
Autorzy:
Tehrani, M. R. F.
Vossoughi, M.
Shamsai, A.
Powiązania:
https://bibliotekanauki.pl/articles/206934.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nickel
porous materials
reaction kinetics
adsorption model
nitrate removal
nitrates
nikiel
materiały porowate
kinetyka reakcji
model adsorpcji
usuwanie azotanów
azotany
Opis:
Originally, the application of nano zero valent iron/nickel (nZVI/Ni) particles for nitrate removal in porous media was studied. nZVI/Ni was prepared and employed in batch and continuous modes. Based on batch experiments, the reaction kinetics was consistent with the adsorption model by the order of 1–1.5. The variation of the kinetics order depends on pH and nickel content. So that highest reactivity was observed for nZVI with 10% of Ni at pH ≤ 3. Nitrate remediation in a continuous system was mostly influenced by seepage velocity, quantity and freshness of nZVI/Ni and particle size of porous media. In a batch mode, the maximum nitrate removal was 99% while in a continuous mode it did not exceed 85%.
Źródło:
Environment Protection Engineering; 2014, 40, 3; 75-86
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization and beneficiation of iranian low-grade manganese ore
Autorzy:
Mehdilo, A.
Irannajad, M.
Hojjati-Rad, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/110939.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pyrolusite
manganese ore
ore characterization
gravity separation
magnetic separation
Opis:
The mineralogical studies indicated that the Charagah ore deposit contains approximately 17% pyrolusite, 78% calcite and 3–4% quartz. Pyrolusite as a main valuable mineral is found in the forms of coarse and fine pyrolusites. The coarse grains pyrolusite with simple texture is liberated at 180 micrometers. Another kind of pyrolusite with particle size finer than 10 m is disseminated inside gangue phases. This kind of pyrolusite has important effect in beneficiation processes and can affect the manganese grade of the concentrate and its recovery negatively. By jigging machine a pre-concentrate with 20% MnO and a final tailing with about 13% manganese loss are obtained. Using tabling technique or wet high intensity magnetic separation (WHIMS) and also their combination with jigging machine, production of a final pyrolusite concentrate with suitable grade but average recovery is possible. By jigging-tabling a concentrate with – 500+45 m size fraction, 44.3% MnO and 61.3% recovery is obtained while jigging-WHIMS produces a concentrate containing 52.6% MnO with a recovery up to 56.6% and d80 = 180 m.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 725-741
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heterostructure photonic crystal multichannel drop filter based on microcavities and ring resonators
Autorzy:
Amirkhani-Shahraki, A
Shahraki, M N
Mosavi, M.R.
Powiązania:
https://bibliotekanauki.pl/articles/174469.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
finite difference time domain method
ring resonators
heterostructure
microcavities
photonic crystal integrated circuits
Opis:
In this paper, a heterostructure photonic crystal multichannel drop filter based on ring resonators and microcavities is presented. This structure has been made in the form of a two-dimensional square lattice with two regions with refractive indexes of 3.464 and 3.86. The refractive indexes are so chosen as to allow the easy and practical fabrication of the device. The presented heterostructure photonic crystal multichannel drop filter consists of a waveguide, two ring resonators and a microcavity. This microcavity is placed at the end of the bus waveguide. The ring resonators have been installed in two regions with different refractive indexes. These ring resonators act as energy couplers, and at their resonance frequencies, they capture the electromagnetic energy which is transmitted in the bus waveguide. Filter characteristics have been obtained by using the finite difference time domain method. Finally, we will demonstrate that in the optimal structure, at ports B and D (vertical), drop efficiencies close to 90% and 67%, respectively, can be obtained within the third communication window, and at port C (horizontal), an efficiency of almost 80% can be achieved within the second communication window.
Źródło:
Optica Applicata; 2014, 44, 1; 5-15
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on heavy metals mobility from zinc plant residues in Iran
Autorzy:
Moradkhani, D.
Eskandari, S.
Sedaghat, B.
Najafabadi, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/110826.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
heavy metals
zinc leaching plant
leaching filter cake
column leaching
Opis:
The transport of heavy metals from mining disposal site to groundwater and surface water is one of the most serious environmental problems in the world. The transport of heavy metals such as Zn, Cd and Mn from leaching filter cake in RECo, Zanjan, Iran was examined by using column leaching. Parameters studied included: flow rate, pH of input solution and leaching time. In this study, the maximum dissolution percents of Zn, Cd and Mn in input solution pH of 5 were 45.50 %, 53.97% and 19.94%, respectively. To statistically analysis the experimental results, SPSS14 software was employed. The results of SPSS 14 indicated that for the Zn, Cd and Mn dissolution, time and flow rate were found respectively, the effective parameters for the pollution in zinc leach residues.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 567-574
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of vertical-cavity surface-emitting laser beam collimation using a nanostructured gradient index microlens
Autorzy:
Nowosielski, J M
Waddie, A. J.
Taghizadeh, M. R.
Buczynski, R.
Powiązania:
https://bibliotekanauki.pl/articles/174429.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
gradient index optics
microlens
soft glass
Opis:
In this paper we show that the recently developed nanostructured gradient index (nGRIN) rod microlens can be utilised for the collimation of the beam generated by a vertical-cavity surface-emitting laser (VCSEL). The modelling of the nanostructured lens structure is performed using the finite difference time domain (FDTD) method with realistic nGRIN parameters and a Gaussian model of the light source. The large refractive index gradient of the nanostructured microlens allows the final microlens thickness to be only 70 μm with a diameter of 10 μm. Successful collimation of a single-mode VCSEL beam with a waist half-width of 1.53 μm is presented with a reduction in divergence half-angle from 10.1° to 3.3°. We show that the linear polarisation of the incident beam is preserved as well as presenting the tolerance of this type of lens to variations in overall thickness.
Źródło:
Optica Applicata; 2013, 43, 4; 761-772
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of human thermal comfort and heat stress in an outdoor urban setting in summer under arid climatic conditions
Autorzy:
Abdel-Ghany, A. M.
Al-Helal, I. M.
Shady, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/950038.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
arid regions
sensory perception
thermal comfort
climatic conditions
effective temperature
human thermal comfort
solar-radiation fluxes
thermal stress
heat stress
suchy klimat
percepcja sensoryczna
komfort cieplny
warunki klimatyczne
temperatura efektywna
komfort cieplny człowieka
strumienie promieniowania słonecznego
stres termiczny
stres cieplny
Opis:
Thermal sensation and heat stress potential were evaluated in summer in an outdoor arid environment. Such evaluation had never been made in arid regions. Various scales: the temperaturehumidity index (THI), physiological effective temperature (PET), universal thermal climatic index (UTCI) and standard effective temperature (SET*) were used for the evaluation. RayMan software model was used to estimate the PET and SET* and the UTCI-calculator was used for UTCI. The required air dry and wet bulb temperatures (Td, Tw), solar radiation flux (S0) and wind speed (V) were measured in summer (April 29–July 15). The results showed that: Persons are exposed to strong heat stress and would feel very hot most of the day time; and they are safe from heat stress risk and would feel comfortable most of the night time. Heat stress levels can be determined using the PET or UTCI scales; both are valid for arid environment and their results are almost similar; however, the THI cannot be used. SET* index specifically describes the thermal sensations and discomfort conditions along with summer days at any activity under arid conditions.
Źródło:
Environment Protection Engineering; 2014, 40, 3; 139-150
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperelastic behavior of porcine aorta segment under extension-inflation tests fitted with various phenomenological models
Autorzy:
Veljković, D. Ž.
Ranković, V. J.
Pantović, S. B.
Rosić, M. A.
Kojić, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/307016.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
parametry mechaniczne
aorta
badania na zwierzętach
identyfikacja
material parameters identification
mechanical properties
porcine aorta
strain energy function
Opis:
Most of hyperelastic models for the constitutive modeling of the typical mechanical behaviour of the arterial wall tissue in literature are based on the test data from different animals and arteries. This paper is concerned with the material parameter identification of several phenomenological hyperelastic models by fitting the data from five extension-inflation tests of the porcine aorta segment, carried out in our laboratory. A membrane approximation is used to compute stresses and strains achieved during experiments, with usual assumption of material incompressibility. Three orthotropic two-dimensional strain-energy functions, based on use of the Green-Lagrange strains, are fitted to the test data: the well-known Fung’s exponential model; the classical polynomial model with seven constants; and the logarithmic model; as also, two three-dimensional models are employed: polyconvex anisotropic exponential hyperelastic model and the convex isotropic exponential rubber-like hyperelastic constitutive law depending on the first invariant of the right Cauchy-Green deformation tensor. It is found that isotropic model overestimates values of stresses in axial, and underestimates values of stresses in circumferential direction of artery segment, due to pronounced tissue anisotropy. Also, all considered two-dimensional models give good and similar prediction, while the polyconvex model demonstrates slightly lower performance in the axial direction of artery.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 3; 37-45
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Behavior of temporal parameters of the ground reactive forces for the walking of postmenopausal women
Autorzy:
Sousa, A. L. de
Gabriel, R. E. C. dias
Faria, A. M.
Aragao, F. R.
Moreira, M. H. R.
Powiązania:
https://bibliotekanauki.pl/articles/306799.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
lokomocja
własności temporalne
siła
menopauza
bipedal locomotion
temporal parameters
force platform
ground reactive force
menopause
visceral fat
Opis:
The study aimed to examine the influence of body composition and menopause characteristics on certain temporal parameters of the behavior of vertical and anteroposterior components of ground reactive forces, as well as the vertical and anteroposterior rates on the walking of postmenopausal women. The sample consisted of 67 postmenopausal women, average age 59 years. Body composition was assessed by octapolar bioimpedance and ground reactive force by the Kistler force platform. Vertical loading rate correlated positively with age (r = 0.02) and negatively with weight (r = –0.33). The relationship between the rates of vertical loading and unloading associated positively with menopause time (r = 0.27) but negatively with weight (r = –0.27). Vertical unloading rate showed a negative association with abdominal visceral adiposity (r = –0.27). The relationship between the times of the intermediate and final phases of the support correlated significantly with abdominal visceral adiposity (r = 0.25) and fat mass (r = 0.24). The study suggests that fat mass and abdominal visceral adiposity affect the support time, and increased abdominal visceral adiposity implies a slower pre-suspension phase during the walking of postmenopausal women. Hormone replacement therapy was shown to be an enhancer of steeper vertical loading and anteroposterior unloading and longer time in the double support phase, indicating a greater stability of postmenopausal women when walking.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 3; 119-127
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Observer-Based Fault Detection Structure for Unknown Systems using Input–Output Measurements: Practical Application to BLDC Drive
Autorzy:
Eissa, M. Abdullah
Darwish, R. R.
Bassiuny, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/1193710.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fault
sensor
measurements
observer
BLDC motor
Opis:
Industrial systems serve us in all areas of life. Faults may result in economic loss and wasting energy. Detecting the onset of faults, and determining their location are important engineering tasks. An important class of fault detection (FD) and diagnosis methods utilizes the mathematical model of the monitored system. But, the parameters required for mathematical modelling are limited or unavailable for the most real industrial engineering applications. Observer-based FD is one of the main approaches to FD and identification. At the same time, the traditional observer’s gain calculation required system model parameters. So, this article presents the design of a novel observer for FD purposes using the input–output measurements of the system with unknown parameters. This proposed observer’s design considers observer’s gain tuning, regardless of the mathematical representation of the plant. This the new feature that distinction our observer will facilitate the implementation of FD systems for many unknown parameters industrial systems. The effectiveness of the proposed observer is verified by experimental application to BLDC motor and compared with classical Luenberger observer. The experimental and comparison results prove feasibility and effectiveness of the proposed observer for FD purposes.
Źródło:
Power Electronics and Drives; 2019, 4, 39; 215-224
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Catalytic reduction of nitrous oxide at a nitric acid plant in Bulgaria
Autorzy:
Stefanova, M.
Chuturkova, R.
Powiązania:
https://bibliotekanauki.pl/articles/207530.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
catalysts
chemical plants
emission control
nitric acid
nitrogen oxides
catalytic decomposition
catalytic reduction
nitrous oxide
industrial emissions
katalizatory
zakłady chemiczne
kontrola emisji
kwas azotowy
tlenki azotu
rozkład katalityczny
redukcja katalityczna
podtlenek azotu
emisje przemysłowe
Opis:
A nitric acid plant in Devnya, Bulgaria has implemented a project for catalytic decomposition of nitrous oxide which resulted in reducing N2O emissions from the plant and the overall N2O emissions from the industrial sector in Bulgaria. After implementing the catalyst in September 2005 till the end of 2011, a total amount of 3133 Mg N2O emissions has been measured while the supposed value of N2O emissions without the catalyst being installed would have been 9747 Mg which means a total reduction of 6614 Mg. The results from the research prove the emission reduction potential of the catalyst.
Źródło:
Environment Protection Engineering; 2014, 40, 3; 87-97
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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