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Number of results: 19
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Abstract

In 2009, the heliophysics community exploded with the news that, six months after its launch, the IBEX probe yielded a completely unexpected result: instead of appearing as the anticipated smudgy blob, the full sky map revealed the heliosphere to resemble a ribbon. Then, in early 2012, IBEX revolutionized our way of thinking about the heliosphere once again.
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Authors and Affiliations

Justyna Sokół
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Abstract

The article presents how multi-layered urban lighting projects fit into the programs of integrated activities to improve the living conditions of the local community, the surrounding space, and its economic relations. The role of the electric lighting in revealing the night image of the city, its promotion and public spaces transformations offering new impressions to city residents is growing thanks to the use of the SSL technology. The authors focus on a role of outdoor lighting projects in urban regeneration within the selected urban areas. The paper describes how conscious shaping of lighting by analysing the goals and stages of the project can contribute to the improvement of quality in the processes of renewal of degraded urban areas.

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Authors and Affiliations

Natalia Sokół
Katarzyna Rusek
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Abstract

W 2009 roku w środowisku heliofizyków zawrzało, kiedy pół roku od startu sonda IBEX na pierwszej mapie pełnego nieba pokazała zamiast przewidywanego rozmazanego placka coś, co kształtem przypomina wstęgę. Z początkiem 2012 roku IBEX kolejny raz zmienił dotychczasowy obraz heliosfery.
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Authors and Affiliations

Justyna M. Sokół
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Abstract

Slender systems are mostly studied when Euler’s load or follower load is considered. The use of those types of external loads results in well-known divergence or flutter shape of the characteristic curve. In this study, one takes into account the specific load which allows one to obtain an interesting divergence – pseudo flutter shape of characteristic curves on the external load–vibration frequency plane. The curves can change inclination angle as well as one can observe the change in vibration modes along them. The shape of those curves depends not only on the parameters of the slender system but also on loading heads that induce the specific load. In this study, one considers the slender multimember system in which cracks are present and weaken the host structure. The results of theoretical as well as numerical simulations are focused on the influence of the parameters of the loading heads on vibrations, stability, and loading capacity of the investigated system as well as on the possibility of partial reduction of unwanted crack effect.
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Authors and Affiliations

Krzysztof Sokół
1
ORCID: ORCID
Krzysztof Kuliński
2

  1. Department of Mechanics and Machine Design Foundations, Czestochowa University of Technology, Czestochowa, Poland
  2. Department of Civil Engineering, Czestochowa University of Technology, Czestochowa, Poland
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Abstract

This paper presents the results of a numerical analysis of nitride-based edge-emitting lasers with an InGaN/GaN active region designed for continuous wave room temperature emission of green and blue light. The main goal was to investigate whether the indium thin oxide (ITO) layer can serve as an effective optical confinement improving operation of these devices. Simulations were performed with the aid of a self-consistent thermal-electrical-optical model. Results obtained for green- and blue-emitting lasers were compared. The ITO layer in the p-type cladding was found to effectively help confine the laser mode in the active regions of the devices and to decrease the threshold current density.

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Authors and Affiliations

M. Kuc
A.K. Sokół
Ł. Piskorski
M. Dems
M. Wasiak
R.P. Sarzała
T. Czyszanowski
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Abstract

In this paper one presents the new concept of a rocker-bogie suspension where the suspension members can change their length. As a result of this action the frame with suspension is able to adjust to the specific environmental conditions. The main problem with the designed suspension system is a fact that with an extension of the suspension members their slenderness increases as well as final displacements. The solution of this problem is not so simple because the construction must meet the specific requirements due to participation of the mobile platform in different competitions. In the presented results of numerical simulations one shows an influence of the different materials on stress and displacements magnitudes of suspension members when the mobile platform hits an obstacle. This situation allows one to test different engineering solutions in the worst case scenario when suspension elements may be damaged. Finally the optimum design is presented.
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Authors and Affiliations

K. Sokół
1
ORCID: ORCID
M. Pierzgalski
1
ORCID: ORCID

  1. Czestochowa University of Technology , Department of Mechanics and Machine Design Foundations , 73 Dąbrowskiego Str., 42-201 Częstochowa, Poland
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Abstract

Unmanned vehicles are often used in everyday life, mostly by rescue teams or scientists exploring new terrains. In those constructions, the suspension has constant dimensions, which leads to many disadvantages and limits the application area. The solution to these problems can be creating a six-wheeled mobile platform that can dynamically change the wheelbase in relation to the area of action or terrain inclination angle. The active change in location of the center of gravity gives a possibility to access sloppy obstacles not available with classical suspensions. The main scope of this study is to investigate the influence of material properties on vibration frequency at different lengths of suspension members. The obtained results will allow finding the optimum material for producing a prototype unit.
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Bibliography

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  2.  P. Flocchini, G. Prencipe, N. Santoro, and P. Widmayer, “Hard tasks for weak robots: the role of common knowledge in pattern formation by autonomous mobile robots”, in Lecture Notes in Computer Science, vol. 1741, 1999, doi: 10.1007/3-540-466320_10.
  3.  L. Moskvin, R. Lavrenov, E. Magid, and M., Svinin, “Modelling a crawler robot using wheels as pseudo-tracks: model complexity vs performance” in IEEE 7th International Conference on Industrial Engineering and Applications (ICIEA), pp. 1–5, 2020.
  4.  A. Halme, I. Leppanen, S. Salmi, and S. Ylonen, “Hybrid locomotion of wheel-legged machine”, in Proc. CLAWAR 2000 Conf. Professional Engineering, 2000, vol. 1, pp. 167–173.
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  6.  A. Gronowicz and J. Szrek, “Idea of a quadruped wheel-legged robot”, The Arch. Mech. Eng., vol. 54, pp. 263–278, 2009, doi: 10.24425/ ame.2009.132101.
  7.  J. Szrek and P. Wójtowicz, “Idea of wheel-legged robot and its control system design”, Bull. Pol. Acad. Sci. Tech. Sci., vol. 58, no. 1, pp. 43–50, 2010, doi: 10.2478/v10175-010-0004-8.
  8.  V. Ţoţu and C. Alexandru, “Multi-criteria kinematic optimization of a front multi-link suspension mechanism using DOE screening and regression model”, Appl. Mech. Mater., vol. 332, 351–356, 2013.
  9.  P. Ptak, M. Pierzgalski, D. Cekus, and K. Sokół, “Modeling and stress analysis of a frame with a suspension of a mars rover”, Procedia Eng., vol. 177, pp. 175–181, 2017, doi: 10.1016/j.proeng.2017.02.215.
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  12.  K. Sokół, D. Cekus, and M. Pierzgalski, “Design and stress analysis of a frame with suspension to multitask terrain rover”, in Engineering Mechanics 2019, 2019, pp. 283–286, doi: 10.21495/71-0-283.
  13.  K. Sokół and M. Pierzgalski, “An influence of the material properties on the endurance of the self-adjustable rocker-bogie suspension”, Arch. Metall. Mater., vol. 66, no. 2, pp. 543–548, 2021, doi: 10.24425/amm.2021.135891.
  14.  P. Pierzgalski, P. Ptak, D. Cekus, and K. Sokół, “Modeling and stress analysis of a manipulator mounted on a mars rover”, Procedia Eng., vol. 177, pp. 121–126, 2017, doi: 10.1016/j.proeng.2017.02.199.
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Authors and Affiliations

Krzysztof Sokół
1
ORCID: ORCID
Maciej Pierzgalski
1
ORCID: ORCID

  1. Institute of Mechanic and Machine Design Foundations, Czestochowa University of Technology, Czestochowa, Poland
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Abstract

In June 2021, a tornado struck a large area in southern Moravia, causing extensive damage to property owned by individuals and legal entities. A need thus arose to speed up the process of estimating the amount of insurance indemnity. This process involved local inspections and subsequent assessment of quotations from construction companies for repairs, as the adjusters did not have the time and resources to estimate the amount of damage using the usual method, i.e. an itemised budget containing a list of works, supplies and services necessary to restore a structure to its original condition based on an on-site inspection. This article contains a retrospective analysis of the accepted quotations and evaluates differences in terms of scope and price compared to the standard procedure. Four apartment buildings were selected for assessment of the insulation and roof repairs. The results show that there are clear discrepancies between the price as determined by the itemised budget using the usual prices and the construction companies’ quotations. The analysis of the selected buildings has indicated that the quotations can by no means be accepted without first establishing the total damage and its actual scope. Major damage caused by a natural disaster will still have to be estimated on the basis of a personal inspection of the damaged property and preparation of an itemised budget created in line with the applicable pricing system.
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Authors and Affiliations

Michal Mikulík
1
ORCID: ORCID
Tomáš Hanák
1
ORCID: ORCID
Patrik Sokol
1
ORCID: ORCID
Miloslav Výskala
1
ORCID: ORCID

  1. Faculty of Civil Engineering, Brno University of Technology, 602 00 Brno, Czech Republic
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Abstract

Daylight character in a space can be defined as the manner in which daylight permeates and is dispersed in that space. The architectural elements related to daylighting under investigation in this study were rooted in Iranian-Isfahani heritage, considered traditional Iranian architecture (from the 16th to early 20th century). The establishment of a classification system for daylighting systems holds significant utility. This study aims to delineate the architectural components present in Isfahani-style structures that facilitate the ingress of daylight, thereby enhancing the indoors.
The methodology employed in this research relies on subjective observation and photographic documentation. Based on the findings of this study, architectural daylighting elements can be organized into four distinct categories: Controllers, Scatterers, Filterers, and Modifiers. This classification system delineated these categories based on the observed order in their complexity (in terms of both quantity and quality of daylight treatment), function (pertaining to lighting, view-out, or shading), material characteristics (including transparency, roughness, and brightness), and their impact on daylighting (such as distribution, colour rendition, and intensity). Daylight Controllers encompassed elements like the hurno (skylight), the ravaq, the sabat, and the tabesh-band/sarsayeh/kharakpoush (shading devices), while daylight Scatterers encompassed the shabak, the rozan, the pachang (windows and doors), and the muqarnas (an ornamental feature of skylight). Daylight Filterers, representing more advanced elements when compared to the previous two categories, included the goljam (windows) and the jam-khaneh (skylights). The most intricate daylight manipulation elements were the daylight Modifiers, exemplified by the orosi (windows) and the roshandan (skylight)
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Authors and Affiliations

Mosleh Ahmadi
1
ORCID: ORCID
Natalia Sokół
1
ORCID: ORCID
Joanna Francuzik
1
ORCID: ORCID
Justyna Martyniuk-Pęczek
1
ORCID: ORCID

  1. Gdańsk University of Technology Faculty of Architecture and Urban Planning

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