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Tytuł:
Disturbances of water level indication in the selected smoke- -tube exhaust gas boiler under the real ambient conditions
Autorzy:
Tuński, T.
Powiązania:
https://bibliotekanauki.pl/articles/359957.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
steam production
de-loaded engine
real ambient conditions
Opis:
New ways of the long term operation of low-speed long-stroke marine Diesel engines such as “Slow Steaming” and “Super Slow Steaming” caused disturbances in operation of waste heat recovery systems from main engines exhaust gases. The advancement of the control systems of the water level in smoke-tube exhaust gas boiler created a possibility to change that parameter during operation of the “main engine – exhaust gas boiler” system. It was made use of such a feature to develop a system of readjustment of water level in the smoke-tube boiler to main engine load. However, introduced methods were saddled with simplifications that can bring in additional disturbances in operation of the boiler feed water systems. The bellow paper deals with influence of the ambient condition of the smoke-tube waste heat boiler on the water level indication in the boiler.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 2; 182-185
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Induction hardening of tool steel for heavily loaded aircraft engine components
Autorzy:
Rokicki, P.
Powiązania:
https://bibliotekanauki.pl/articles/352313.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
induction hardening
heavily-loaded gears
heat treatment
microstructure
Opis:
Induction hardening is an innovative process allowing modification of the materials surface with more effective, cheaper and more reproducible way to compare with conventional hardening methods used in the aerospace industry. Unfortunately, high requirements and strict regulation concerning this branch of the industry force deep research allowing to obtain results that would be used for numerical modelling of the process. Only by this way one is able to start the industrial application of the process. The main scope of presented paper are results concerning investigation of microstructure evolution of tool steel after single-frequency induction hardening process. The specimens that aim in representing final industrial products (as heavily loaded gears), were heat- -treated with induction method and subjected to metallographic preparation, after which complex microstructure investigation was performed. The results obtained within the research will be a basis for numerical modelling of the process of induction hardening with potential to be introduced for the aviation industrial components.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 315-320
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acetylene Flow Rate as a Crucial Parameter of Vacuum Carburizing Process of Modern Tool Steels
Autorzy:
Rokicki, P.
Dychton, K.
Powiązania:
https://bibliotekanauki.pl/articles/354322.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vacuum carburizing
heavily-loaded gears
thermo-chemical treatment
microstructure
Opis:
Carburizing is one of the most popular and wide used thermo-chemical treatment methods of surface modification of tool steels. It is a process based on carbon diffusive enrichment of the surface material and is applied for elements that are supposed to present higher hardness and wear resistance sustaining core ductility. Typical elements submitted to carburizing process are gears, shafts, pins and bearing elements. In the last years, more and more popular, especially in highly advanced treatment procedures used in the aerospace industry is vacuum carburizing. It is a process based on chemical treatment of the surface in lower pressure, providing much higher uniformity of carburized layer, lower process cost and much lesser negative impact on environment to compare with conventional carburizing methods, as for example gas carburizing in Endo atmosphere. Unfortunately, aerospace industry requires much more detailed description of the phenomena linked to this process method and the literature background shows lack of tests that could confirm fulfilment of all needed requirements and to understand the process itself in much deeper meaning. In the presented paper, authors focused their research on acetylene flow impact on carburized layer characteristic. This is one of the most crucial parameters concerning homogeneity and uniformity of carburized layer properties. That is why, specific process methodology have been planned based on different acetylene flow values, and the surface layer of the steel gears have been investigated in meaning to impact on any possible change in potential properties of the final product.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2009-2012
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser stimulated nonlinear optics of Ag nanoparticle-loaded poriferous TiO2 microtablet
Autorzy:
Nafisah, S.
Saad, S. K. M.
Umar, A. A.
Plucinski, K.
Lis, M.
Maciaga, A.
Miedzinski, R.
Powiązania:
https://bibliotekanauki.pl/articles/173662.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Ag-loaded poriferous TiO2 microtablets
photoinduced second harmonic generation
Opis:
The studies of the photoinduced second harmonic generation were performed for the Ag-loaded poriferous TiO2 microtablets deposited on an ITO substrate. The poriferous TiO2 microtablets on a pre-cleaned ITO substrate (Kaivo, China, sheet resistance of ca. 10 Ω/square) were prepared by simply immersing the ITO substrate vertically into the growth solution that contains 5 ml of 0.5 M (NH4)2TiF6 (Sigma-Aldrich) and 5 ml of 1.0 M H3BO3 (R.M. Chemicals) for 15 h at room temperature. The samples were obtained from the growth solution with concentration of 0.4, 0.5 and 0.6 M. We have found that maximal second harmonic generation signal was achieved for the samples with concentration 0.5 M.
Źródło:
Optica Applicata; 2015, 45, 2; 263-271
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation and representation of machine tool deformations
Autorzy:
Archenti, A.
Osterlind, T.
Nicolescu, C. M.
Powiązania:
https://bibliotekanauki.pl/articles/99452.pdf
Data publikacji:
2011
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tool
testing
deformation
static stiffness
circular test
loaded double ball bar
Opis:
This paper presents a novel test concept for the evaluation of the accuracy of NC machine tools. The evaluation of machine tools deformations is performed by help of a device similar to the double ball bar (DBB) with the difference that an adjustable load generated by the devic can be applied between spindle nose and machine tool table. This load eliminates the play existing in machine tool joints, thus reproducing the testing conditions that exist during machining. Collected data are used to plot diagrams displaying characteristic aspects of machine tool performance and a number of key figures such as static stiffness may be determined. The data can also be used for trend analysis; to predict any accuracy deviations, and further to conduct preventive maintenance instead of emergency calls. The determined static behaviour could also be used to improve digital models for process simulations and compensation of errors that are caused by deflection.
Źródło:
Journal of Machine Engineering; 2011, 11, 4; 105-117
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Формирование межкультурной коммуникативной компетенции у будущего инженера средствами иностранного языка
Building intercultural communication competence of future engineers by means of foreign language
Autorzy:
Клеменцова, Надежда
Powiązania:
https://bibliotekanauki.pl/articles/443145.pdf
Data publikacji:
2011
Wydawca:
ADVSEO
Tematy:
COMMUNICATIVE COMPETENCE
CULTURAL AWARENESS
INTERCULTURAL COMPETENCE
CULTURE-ORIENTED PARADIGM
CULTURE-LOADED TEXTS
Opis:
Intercultural communicative competence is considered in the paper as being developed in foreign language classroom and through the use of the authentic texts. The notions of intercultural and communicative competence are viewed in the article. The concepts of achievement culture, behavior culture, cultural awareness are touched upon. The role of texts in competence development is analyzed. Forms of work at the text and possible tasks are discussed.
Źródło:
General and Professional Education; 2011, 2; 14-18
2084-1469
Pojawia się w:
General and Professional Education
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recognition of Acoustic Signals of Loaded Synchronous Motor Using FFT, MSAF-5 and LSVM
Autorzy:
Glowacz, A.
Powiązania:
https://bibliotekanauki.pl/articles/176811.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic signal
fault detection
loaded synchronous motor
signal processing
pattern recognition
Opis:
This article discusses a system of recognition of acoustic signals of loaded synchronous motor. This software can recognize various types of incipient failures by means of analysis of the acoustic signals. Proposed approach uses the acoustic signals generated by loaded synchronous motor. A plan of study of the acoustic signals of loaded synchronous motor is proposed. Studies include following states: healthy loaded synchronous motor, loaded synchronous motor with shorted stator coil, loaded synchronous motor with shorted stator coil and broken coil, loaded synchronous motor with shorted stator coil and two broken coils. The methods such as FFT, method of selection of amplitudes of frequencies (MSAF-5), Linear Support Vector Machine were used to identify specific state of the motor. The proposed approach can keep high recognition rate and reduce the maintenance cost of synchronous motors.
Źródło:
Archives of Acoustics; 2015, 40, 2; 197-203
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stiffness analysis of multi-chain parallel robotic systems with loading
Autorzy:
Pashkevich, A.
Klimchik, A.
Chablat, D.
Wenger, P.
Powiązania:
https://bibliotekanauki.pl/articles/384671.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
parallel robotic manipulators
stiffness analysis
kinetostatic modelling
loaded mode
Orthoglide robot
Opis:
The paper presents a new stiffness modelling method for multi-chain parallel robotic manipulators with flexible links and compliant actuating joints. In contrast to other works, the method involves a FEA-based link stiffness evaluation and employs a new solution strategy of the kinetostatic equations, which allows computing the stiffness matrix for singular postures and to take into account influence of the external forces. The advantages of the developed technique are confirmed by application examples, which deal with stiffness analysis of a parallel manipulator of the Orthoglide family.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 3; 75-82
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of lateral vibrations of the axially loaded helical spring
Autorzy:
Michalczyk, K.
Powiązania:
https://bibliotekanauki.pl/articles/279466.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
helical spring vibrations
axially loaded spring
coil spring
Timoshenko equivalent beam
Opis:
It is shown in this paper that the proposed concept by Krużelecki and Życzkowski (1990) of the equivalent rod can be applied in calculations of natural lateral vibrations of springs and that the obtained results will be nearer FEM results than the standard model based on the Timoshenko equivalent beam. The model, created on this base, allows one to calculate natural frequencies of the clamped-clamped spring. It is also shown that models based on the equivalent beam concept, which are easier to apply than the models treating the spring as the spatially curved rod, have only a slightly smaller accuracy. It is also indicated that in the most common practice making of manufacturing end coils of springs, the natural frequencies differ significantly from the frequencies calculated by means of all tested methods. The performed simulations show that differences between the first and the second as well as the third and the fourth natural frequency of the spring are small and, therefore, the axially symmetrical equivalent beam model can be used without a large error. The diagram allowing one to determine whether the desired frequencies are lower or higher than the cut-off frequency is developed for the presented model.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 745-755
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The dynamic programming model for optimal allocation of laden shipping containers to Nigerian seaports
Autorzy:
Amuji, Harrison O.
Onwuegbuchunam, Donatus E.
Aponjolosun, Moses O.
Okeke, Kenneth O.
Mbachu, Justice C.
Ojutalayo, John F.
Powiązania:
https://bibliotekanauki.pl/articles/2176021.pdf
Data publikacji:
2022
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
dynamic programming
ships’ waiting times
optimal allocation policy
Nigerian seaports
loaded shipping containers
Opis:
In highly competitive shipping market environment, container network operators-Freight forwarders, shipping companies etc. are concerned about design, development and deployment of optimized allocation model to achieve cost savings through improved container storage yard operations, crane productivity, outbound container allocation/distribution to seaport terminals and hence reduction in ships’ waiting times. In this paper, we developed two models, the Dynamic programming model and optimal allocation policy (model), for the optimal allocation of units of outbound laden cargo containers of sizes: 20ft and 40ft to six (6) major seaports in Nigeria. The distributions of the laden containers were allocated as follows: Port-Harcourt, Tincan Island, Onne, and Calabar seaports were allocated with 1,064 units of stuffed containers each. Apapa seaport was allocated with 2,128 units of laden containers, and zero allocation was made to Warri seaport. These results were arrived at through the implementation of the optimal allocation policy. The zero units allocation made to Warri seaport could be attributed to poor shipper patronage and hence the low frequency of ship visits. Apapa seaport was allocated double the number of containers moved to the remaining ports because it attracted more shipper patronage and hence more ship visits. Hence, freight forwarding companies will be assured of cargo spaces and make more profit by allocating more containers. Policy implications of the developed models were discussed.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2022, 7, 2; 69--79
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of processing parameters on the properties of amphiphilic block copolymer micelles prepared by supercritical carbon dioxide evaporation method
Autorzy:
Jiao, Z.
Wang, Z.
Wang, X.
Fan, W.
Powiązania:
https://bibliotekanauki.pl/articles/778902.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
supercritical carbon dioxide
amphiphilic block copolymer
drug-loaded micelles
processing parameters
optimization
Opis:
The operation parameters for the supercritical carbon dioxide (ScCO2 ) evaporation method greatly affect the properties of the prepared drug-loaded micelles. In this study, the effects of those key parameters on the drug-loading content (LC) and drug entrapment efficiency (EE) are discussed. It is observed that EE and LC of the micelles are slightly increased with the enhancing temperature and the copolymer molecular ratio of hydrophilic/hydrophobic segment, while decreased with the enhancing ScCO2  evaporation rate. The pressure and volume ratio of ScCO2  to H2 O are observed the optimum condition. In addition, the verification experiment is carried out under the obtained optimizing parameters. The prepared micelles exhibit relatively regular spherical shape and narrow size distribution with the EE and LC value of 70.7% and 14.1%, respectively.
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 1; 81-86
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of grouting pressure volatility on additional response of adjacent pile foundation in shield construction
Autorzy:
Zhang, Chuan-Chuan
Li, Dan-Mei
Zhang, Jun
Yu, Tong-Sheng
Chen, Qiang
Powiązania:
https://bibliotekanauki.pl/articles/2086958.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
grouting pressure fluctuations
adjacent loaded-pile foundation
normal distribution
FLAC3D
Opis:
Soil parameters along the heading direction are subjected to spatial variability during shield construction, so grouting pressure requires constant adjustment to ensure ground stress sta- bility. This causes grouting pressure to fluctuate around the design pressure/curve. There- fore, the influence of the grouting pressure volatility on the adjacent loaded-pile foundation should be considered in shield tunneling. In this study, a refined numerical simulation of the shield construction process is conducted using the Fast Lagrangian Analysis of Continua in Three Dimensions (FLAC3D) software. A total of 300 groups of grouting pressure pa- rameters with a skewed normal distribution are input into the numerical model. Then, the influence of the construction parameter uncertainty on the adjacent loaded-pile foundation is analyzed. Finally, the back analysis method is conducted based on the monitored data to evaluate how the construction process affects the pile foundation. The calculation results are compared with those of the traditional finite element method. The results indicate that in the tunneling process, the grouting pressure fluctuation greatly affects the additional bend- ing moment of the adjacent pile foundation. Under the influence of the grouting pressure, the additional axial force and additional bending moment of the pile foundation also follow the skewed normal distribution. The back analysis results of the pile foundation are greater than those of the typical numerical method by about 60% 100%, that is using the back analysis calculation results to evaluate the pile foundation additional response can reduce the risk.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 1; 33--47
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of cavity geometry on an aspirated compressor cascade
Autorzy:
Guo, S.
Lu, H.-W.
Liu, J.
Wu, C.-J.
Powiązania:
https://bibliotekanauki.pl/articles/280871.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
highly loaded compressor cascade
boundary layer suction
suction flow distribution
off-take cavity
Opis:
The impact of the bleed off-take cavity within aspirated blades on the aerodynamic perfor- mance of a highly loaded compressor cascade was explored. Three-dimensional Navier-Stokes simulations were conducted in rectangular compressor cascades after validation against expe- rimental results were done. Five different off-take configurations with varying suction loca- tion were numerically evaluated. The results show that the regularities of the suction flow distribution on the suction slot inlet greatly influence the benefits of boundary layer suction. The distribution style greatly depends not only on the flow condition of the blade passage, but also on the realization of the suction process and the geometry of the cavity inside the aspirated blade. The low kinetic fluid in the endwall region compared with that around the midspan is usually prone to be sucked into the suction slot. The distribution of the suc- tion mass flow along the spanwise direction would be symmetrical if the suction position is properly selected and the inside off-take cavity is well designed, even though the bleeding system has been simplified to be asymmetrical as employed in the present document.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 117-128
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of dynamical model of wheel machinery allocated on a flat-car
Opracowanie dynamicznego modelu maszyn kołowych rozmieszczonych na platformach kolejowych
Autorzy:
Turanov, K.
Portnova, O.
Powiązania:
https://bibliotekanauki.pl/articles/374745.pdf
Data publikacji:
2010
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
mocowanie
maszyna kołowa
reakcja więzów
siła hamowania
fastening
wheel machinery
constraint reaction
friction force
loaded wagon vibrations
Opis:
The paper gives the results of dynamical modeling of the mechanical system "flat car - elastic elements - wheel machinery body", allocated on a railway flat car. There have been obtained the formulas of equivalent rigidity of fastening spatial flexible elements relative to a vertical line, which are equal to rigidity of bus and spring flexible elements being plugged in series and which are then equal to rigidity of all elastic elements of wheeled machinery as springs being plugged in parallel.
Źródło:
Transport Problems; 2010, 5, 2; 71-82
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie techniki skanowania 3D do pomiaru stóp (1) Metodyka i wyniki pomiarów
Application of 3 D scanning technique for measuring feet (1) Methodology and measurement results
Autorzy:
Hrynyk, R.
Frydrych, I.
Cichocka, A.
Powiązania:
https://bibliotekanauki.pl/articles/180480.pdf
Data publikacji:
2016
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
parametry stopy
skaner ręczny
odciążona i obciążona stopa
foot parameters
handy scanner
unloaded and loaded foot
Opis:
Przedstawiono 15 parametrów stopy ludzkiej oraz metodykę ich pomiaru za pomocą skanera ręcznego 3D. Pomiar stopy powinien stanowić podstawę do projektowania obuwia ochronnego dopasowanego do określonych typoszeregów użytkowników lub wyrobów przeznaczonych dla indywidualnego klienta. Wykonano pomiary 15 parametrów stopy ludzkiej 55 ochotników w pozycji siedzącej (dla stopy odciążonej) oraz w pozycji stojącej (dla stopy dociążonej) przed i po wysiłku fizycznym, a następnie przeprowadzono ich ocenę.
This paper presents 15 parameters of the human foot and a methodology for measuring them with a 3D handy scanner. This kind of measurement is a basis for designing shoes for a given group of users or products dedicated for an individual client. Fifteen foot parameters were measured for 55 volunteers in the sitting position (for an unloaded foot) and in the standing position (for a loaded foot) before and after effort. The results were then analysed.
Źródło:
Bezpieczeństwo Pracy : nauka i praktyka; 2016, 6; 12-16
0137-7043
Pojawia się w:
Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł

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