Autor: A.C.S. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of palladium chemical structure on hydrogen sensing properties of carbonaceous–palladium thin films
Autorzy:: Kaminska, A.
Krawczyk, S.
Kozlowski, C.
Powiązania:: https://bibliotekanauki.pl/articles/173783.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: C–Pd thin films
hydrogen sensor
FTIR spectroscopy
Opis:: In this work we investigate nanocomposite carbonaceous–palladium (C–Pd) films prepared by physical vapor deposition. Such films are promising materials for hydrogen sensor applications. This is related to the highly selective hydrogen absorption by palladium nanocrystallites. The C–Pd films obtained in various technological conditions differ in structure and electrical properties. These films were characterized by SEM, EDS and FTIR spectroscopy. FTIR spec-troscopy was used to determine the amount of palladium acetate and fullerene, incompletely decomposed during the deposition process. FTIR spectra enabled us to explain the differences in C–Pd films resistance based on palladium chemical structure. The possibility of the application of C–Pd films as active layers in hydrogen sensors was also studied. The results showed that synthesized C–Pd films containing palladium nanograins could be used for hydrogen sensing.
Źródło:: Optica Applicata; 2013, 43, 4; 633-640
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: An optimized design for non-zero dispersion shifted fiber with reduced nonlinear effects for future optical networks
Autorzy:: Raja, A S
Selvendran, S
Priya, R
Mahendran, C
Powiązania:: https://bibliotekanauki.pl/articles/173400.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: dense wavelength division multiplexing
non-zero dispersion shifted fiber
refractive index profile
effective area
dispersion slope
Opis:: Accommodation of many channels in dense wavelength division multiplexing networks raises the average power density of the optical networks. This results in severe nonlinear effects in the optical networks. An optimized design of non-zero dispersion shifted fiber with an enormous effective area can overcome this nonlinear effect and also offer a minimum bending loss and splice loss for a dense wavelength division multiplexing system. In this paper, the alpha-peak profile is utilized for calculating electrical field distribution and designing the refractive index profile of the non-zero dispersion shifted fiber. This fiber has a high effective area of about 120 μm2. Conjointly, the accomplished fiber has a very low bending loss of 1.40×10–14 dB/km and reduced splice loss of 4.46×10–3 dB. Due to this high effective area, the dense wavelength division multiplexing network performance is upgraded by diminishing nonlinear effects. In addition, the newly designed fiber has also a very low dispersion slope (0.057 ps/nm2km). Thus, the proposed fiber is optimized to handle high bandwidth and multiple high bit-rate wavelength channels without nonlinear impairments in the 1.55 μm window long-haul dense wavelength division multiplexing systems.
Źródło:: Optica Applicata; 2014, 44, 4; 503-519
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: Simultaneous decolorization of ternary dye mixture from aqueous solution by electrocoagulation
Autorzy:: Keskin, C. S.
Özdemir, A.
Karabayir, E.
Şengil, I. A.
Powiązania:: https://bibliotekanauki.pl/articles/208189.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: coagulation
mixtures
COD removal
dye concentration
electrocoagulation
NaCl concentration
ternary mixtures
decolorization
koagulacja
mieszaniny
usuwanie COD
stężenie barwnika
elektrokoagulacja
stężenie NaCl
mieszanina trójskładnikowa
odbarwianie
Opis:: The current study focused on the treatment of a ternary mixture of dyes which includes Disperse Blue 56 (DB56), Basic Yellow 28 (BY28) and Acid Violet 90 (AV90) using the electrocoagulation (EC) process with iron electrodes. In the presence of all dye molecules, the optimum pH was found to be 6, optimum NaCl concentration was 3000 mg/dm3 and optimum current density was 8.66 mA/cm2. Under the optimized conditions in the case of 100 mg/dm 3 each dye concentration, the average colour removal efficiency was reached 93%. Dye concentration dependent highest COD removal efficiency was measured as 88.70% at 150 mg/dm3 dye concentration.
Źródło:: Environment Protection Engineering; 2013, 39, 3; 119-133
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: Catalytic pyrolysis of rice straw and product analysis
Autorzy:: Song, C.
Pawłowski, A.
Ji, J.
Shan, S.
Cao, Y.
Powiązania:: https://bibliotekanauki.pl/articles/207442.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: thermogravimetric analysis
catalytic pyrolysis
effect of addition
pyrolysis products
rice straw
analiza termograwimetryczna
piroliza katalityczna
piroliza
produkty pirolizy
słoma ryżowa
Opis:: The effect of addition of NaOH on the pyrolysis of rice straw and properties of its product were investigated. The pyrolysis was examined by means of the thermogravimetric (TG) analysis, and the pyrolysis product was characterized by the elemental analysis, GC and GC-MS. The result showed that addition of NaOH can significantly change TG and DTG peak of the pyrolysis of rice straw. As a result of the catalysis, significant difference in the properties of pyrolysis products was also observed. The addition of the catalyst promoted the increase of the hydrogen content of the gaseous product (from 1.6% to 53.37%), as well as that of the H/C and O/C ratios of solid residue. GC-MS analysis indicated that the liquid product was mainly made up of ketones, phenols and furfural, and NaOH addition did not change the main constitute of the liquid product, but changed their relative content.
Źródło:: Environment Protection Engineering; 2014, 40, 1; 35-43
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 5.

Tytuł:: Froth flotation of Aljustrel sulphide complex ore
Autorzy:: Sousa, R.
Futuro, A.
Pires, C. S.
Leite, M. M.
Powiązania:: https://bibliotekanauki.pl/articles/109732.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: froth flotation
mineral liberation
flotation reagents
complex sulphide ore
Opis:: Froth flotation of copper-zinc-lead ores is a complex process based on similar metallurgy processing and strong interactions between chalcopyrite and sphalerite. These types of ores represent 15% of the world production and 7.5% of copper deposits all over the world. In the present study, an attempt is made to assess the feasibility of froth flotation of a complex sulphide ore, where the effect of liberation grade as well as depressant, collector and frother dosage was studied. Copper flotation is dependent on the mineral liberation grade, which is significantly related with the size distribution. It was shown that longer grinding time increased the Cu grade but decreased the copper recovery due to the presence of very fine particles. Lime and sodium metabisulphite, used as depressants, allowed to achieve a good flotation performance. It was shown that for this type of ore lower dosage of the collector should be applied. Finally, a higher frother dosage led to a greater selectivity and reduced entrainment of very fine particles, but also caused low kinetic ratio and low recovery of valuable minerals. A well-defined flotation objective was imperative for a good liberation grade and reagents dosage selection, mainly for complex sulphide ores. A useful contribute was given to a better technical understanding of flotation of a complex sulphide ore from the Moinho deposit.
Źródło:: Physicochemical Problems of Mineral Processing; 2017, 53, 2; 758-769
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 6.

Tytuł:: A simple method of incorporating the effect of the Uniform Stress Hypothesis in arterial wall stress computations
Autorzy:: Joldes, G. R.
Noble, C.
Polzer, S.
Taylor, Z. A.
Wittek, A.
Miller, K.
Powiązania:: https://bibliotekanauki.pl/articles/306753.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: naprężenia własne
metoda elementów skończonych
ściana tętnicy
Uniform Stress Hypothesis
residual stress
finite element method
arterial wall stress
Opis:: Residual stress has a great influence on the mechanical behaviour of arterial wall. Numerous research groups used the Uniform Stress Hypothesis to allow the inclusion of the effects of residual stress when computing stress distributions in the arterial wall. Nevertheless, the available methods used for this purpose are very expensive, due to their iterative nature. In this paper we present a new method for including the effects of residual stress on the computed stress distribution in the arterial wall. Methods: The new method using the Uniform Stress Hypothesis enables computing the effect of residual stress by averaging stresses across the thickness of the arterial wall. Results: Being a post-processing method for the computed stress distributions, the proposed method is computationally inexpensive and, thus, better suited for clinical applications than the previously used ones. Conclusions: The resulting stress distributions and values obtained using the proposed method based on the Uniform Stress Hypothesis are very close to the ones returned by an existing iterative method.
Źródło:: Acta of Bioengineering and Biomechanics; 2018, 20, 3; 59-67
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 7.

Tytuł:: Impact of multi-task on symptomatic patient affected by chronical vestibular disorders
Autorzy:: Regrain, E.
Regnault, P.
Kirtley, Ch.
Shamshirband, S.
Chays, A.
Boyer, F.-C.
Taiar, R.
Powiązania:: https://bibliotekanauki.pl/articles/307436.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: rehabilitacja
posturograf
zdolność
postawa człowieka
rehabilitation
posturography
ability
cognitive skills
vestibular disorders
anxiety posture balance
Opis:: Purpose: After a vestibular deficit some patients may be affected by chronical postural instability. The aim of this study was to identify the emotional and cognitive factors of these symptomatic patients. In particular, the double cognitive task and the anxiety disorder were identified by our patients. Through a retrospective study, 14 patients (65.4 ±18 years) participated in the experiment. Method: The experimentation consists in the study of the standing position of our patients through the aggregate of the trajectories of the center of pressure (COP) using a force plate device. With the aim of isolating the emotional and cognitive influence, this experimentation was defined in two conditions. In the first one, the patients were asked to maintain their balance without additional tasks. In the second one, the patients were submitted to an additional cognitive arithmetic task. The stabilogram surface, length (the forward and backward displacement distance during deviations in COP), lateral and the antero-posterior deviations were assessed. Results: Our results showed an increase of postural instability of patients affected by chronical vestibular disorders when submitted to the double task. The patients submitted to the cognitive task present a larger surface of activity in comparison with the free-task one (Wilcoxon test p-value equals p = 0.0453). In addition, their displacements inside this area are more important (p = 0.0338). The COP of all our patients deviated forward in the presence of the double task. Conclusion: The increase in instability during the double cognitive task could be explained by an additional stress caused by the desire to make a success of the cognitive task.
Źródło:: Acta of Bioengineering and Biomechanics; 2016, 18, 3; 123-129
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 8.

Tytuł:: Experimental analysis of insertion torques and forces of threaded and press-fit acetabular cups by means of ex vivo and in vivo measurements
Autorzy:: Vogel, D.
Rathay, A.
Teufel, S.
Ellenrieder, M.
Zietz, C.
Sander, M.
Bader, R.
Powiązania:: https://bibliotekanauki.pl/articles/307285.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: panewka
gwintowanie
kość
kość syntetyczna
insertion force
insertion torque
acetabular cup
press-fit
threaded
synthetic bone
Opis:: In THA sufficient primary implant stability is the precondition for successful secondary stability. Industrial foams of different densities have been used for primary stability investigations. The aim of this study was to analyse and compare the insertion behaviour of threaded and press-fit cups in vivo and ex vivo using bone substitutes with various densities. Methods: Two threaded (Bicon Plus®, Trident® TC) and one press-fit cup (Trident PSL®) were inserted by orthopaedic surgeons (S1, S2) into 10, 20 and 31 pcf blocks using modified surgical instruments allowing measurements of the insertion forces and torques. Furthermore, the insertion behaviour of two cups were analysed intraoperatively. Results:Torques for the threaded cups increased while bone substitute density increased. Maximum insertion torques were observed for S2 with 102 Nm for the Bicon Plus® in 20 pcf blocks and 77 Nm for the Trident® TC in 31 pcf blocks which compares to the in vivo measurement (85 Nm). The average insertion forces for the press-fit cup varied from 5.2-6.8 kN (S1) and 7.2-11.5 kN (S2) ex vivo. Intraoperatively an average insertion force of 8.0 kN was determined. Conclusions: Implantation behaviour was influenced by acetabular cup design, bone substitute and experience of the surgeon. No specific density of bone substitute could be favoured for ex vivo investigations on the implantation behaviour of acetabular cups. The synthetic bone blocks of high density (31 pcf) led to problems regarding cup orientation and seating. Therefore, bone substitutes used should be critically scrutinized in terms of the comparability to the in vivo situation.
Źródło:: Acta of Bioengineering and Biomechanics; 2017, 19, 3; 155-163
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 9.

Tytuł:: Software Startups – A Research Agenda
Autorzy:: Unterkalmsteiner, M.
Abrahamsson, P.
Wang, X. F.
Nguyen-Duc, A.
Shah, S.
Bajwa, S. S.
Baltes, G. H.
Conboy, K.
Cullina, E.
Dennehy, D.
Edison, H.
Fernandez-Sanchez, C
Garbajosa, J.
Gorschek, T.
Klotins, E.
Hokkanen, L.
Kon, F.
Lunesu, I.
Marchesi, M.
Morgan, L.
Oivo, M.
Selig, C.
Seppänen, P.
Sweetman, R.
Tyrväinen, P.
Ungerer, C.
Yagüe, A.
Powiązania:: https://bibliotekanauki.pl/articles/953060.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: software startup
research agenda
software-intensive systems
Opis:: Software startup companies develop innovative, software-intensive products within limited time frames and with few resources, searching for sustainable and scalable business models. Software startups are quite distinct from traditional mature software companies, but also from micro-, small-, and medium-sized enterprises, introducing new challenges relevant for software engineering research. This paper’s research agenda focuses on software engineering in startups, identifying, in particular, 70+ research questions in the areas of supporting startup engineering activities, startup evolution models and patterns, ecosystems and innovation hubs, human aspects in software startups, applying startup concepts in non-startup environments, and methodologies and theories for startup research. We connect and motivate this research agenda with past studies in software startup research, while pointing out possible future directions. While all authors of this research agenda have their main background in Software Engineering or Computer Science, their interestin software startups broadens the perspective to the challenges, but also to the opportunities that emerge from multi-disciplinary research. Our audience is therefore primarily software engineering researchers, even though we aim at stimulating collaborations and research that crosses disciplinary boundaries. We believe that with this research agenda we cover a wide spectrum of the software startup industry current needs.
Źródło:: e-Informatica Software Engineering Journal; 2016, 10, 1; 89-123
1897-7979
Pojawia się w:: e-Informatica Software Engineering Journal
Dostawca treści:: Biblioteka Nauki