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Number of results: 22
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Abstract

The paper is an attempt at reviewing the classical theory of externalities and club goods in the new context of flow economy and network relations, as well as the role of human capital connected with high quality surroundings (urban environment), which is a catalysing factor, and allows the formation of new resources and new competitive advantages for cities and busiensses.

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Authors and Affiliations

Tadeusz Markowski
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Abstract

Energy security is one of the most frequently analysed phenomena in the energy markets. Great variety of scientifc efforts should have indicated clear definition of the phenomenon. However, those studies highlighted more than 80 different definitions of what energy security really is. Due to the fact, that energy security is analyzed by different scientific disciplines, studies have provided a comperehensive reflection on the phenomenon.

The main objective of this paper is of the theoretical nature and focuses on showing energy security externalities. Author delivers an integrative review focusing on existing literature referring to the analyzed phenomena. Energy security is though studied only from the perspective of economics therefore interdisciplinary studies are out of the study scope. The reason for such scientific procedure stem from a belief that each discipline approach is different in terms of concepts, research methods and though results that are obtained. Therefore without undermining high value of interdisciplinary approaches to energy security, author decided to concentrate solely on economic perspective, which in energy security studies seems to be underestimated. Such approach in author’s belief helps achieve theoretical clarity of the below given analysis.

Presented paper is of the theoretical nature and focuses on showing energy security externalities. Critical literature review shows the literature mainstream in which energy security externalities are

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Authors and Affiliations

Honorata Nyga-Łukaszewska
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Abstract

The need for a dwelling is one of the basic needs of every human being. The housing policy, which belongs to one of the pillars of the social policy of the state, is responsible for satisfying this need. It is carried both at the central and local level. The report aims to show the evolution of this policy in Poland from 1989, when the burden of providing housing to the society was largely shifted to the private sector, to the present times, when the state is starting to take action to solve the problem of housing shortages for the less prosperous part of society. First, housing resources are characterized in terms of their ownership and function. Then, the housing policy, its objectives and instruments are described in theoretical terms. The competences of communes in the fi eld of housing economy are characterised in further part. The diagnosis of housing condition in Poland is presented in the regional context and compared to other countries. The last parts of the report deal with the assessment of housing policy in Poland after 1989 on the national and local level. Based on this assessment, recommendations have been made regarding the directions of activities at the local and supra-local level in the area of improving the condition of housing in Poland. Special emphasis in recommendations is placed on the need for an integrated approach to the implementation of housing policy.

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Authors and Affiliations

Tadeusz Markowski
Dominik Drzazga
Dorota Sikora-Fernandez
Lidia Groeger
Justyna Danielewicz
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Abstract

In this paper we develop an open-economy endogenous growth model to examine the influence of fiscal policy on the economy in the long run. We allow for public deficit and 5 types of taxes. One of the novel features is separate treatment of interest rates on public and private debt, both of which are linear functions of appropriate debt-to-GDP ratios. Two extreme situations are analyzed: a model of “decentralized economy”, where economic agents do not take into account any externalities, and a model of “benevolent social planner”. We derive the rules of optimal fiscal policy that induce economic agents to internalize all externalities. Theoretical results are illustrated with an empirical analysis for Poland. The optimal values of several fiscal policy instruments for Poland are calculated.

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Authors and Affiliations

Michał Konopczyński
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Abstract

Due to the spike in inflation, the implementation of easy monetary and fiscal policies since the pandemic appears to be coming to an end. The shift towards tighter policies raises concerns about debt sustainability in developing countries, particularly due to the challenge of the "original sin" problem. Given these premises, to analyze debt sustainability for emerging countries, this study focuses on foreign exchange revenue capability and employs external debt-creating (imports, reserves and interest payments) and reducing variables (exports, reserve return and net transfers) for 1995-2020. The results of this panel cointegration estimation for 15 EMDE countries are 0.74 and 0.70 for CCEMG and AMG estimators respectively which indicates moderate sustainability as whole sample countries. However, the individual estimators vary widely for each individual country from weak to strong sustainability.
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Authors and Affiliations

Sevcan Güneş
1
Tuğba Akin
2

  1. Pamukkale University, Turkey
  2. Aydin Adnan Menderes University, Turkey
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Abstract

Internalization of external economic effects on urban sprawl affected areas. An example of the Krakow Metropolitan Area, The study is a discussion on economic externalities, with particular emphasis on technological effects. Attention is also paid to the problem of internalization of economic external effects caused by movement (transport) in areas affected by the urban sprawl process. The research was conducted for all communes of the Krakow Metropolitan Area (KOM), as a result of which the value of: directly incurred financial losses and the value of lost time generated by the necessity of commuting and return in the space of KOM were presented.

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Authors and Affiliations

Artur Hołuj
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Abstract

Clusters belong to the regional innovation system, which led to the formulation and implementation of the cluster-based policy in many countries. The positive impact of clusters on the competitiveness of regions was confirmed by empirical studies. Absence of clusters means retardation in a regional development. The implementation of cluster policy supporting coopetition into the scope of principled regional policy assumptions seems urgent. In this way effective conditions for the formation of growth poles around industries specific for a given region will be developed and, consequently, the economic specialization of individual regions will be achieved. Observation of the benefits resulting from the functioning of clusters in the region, taking into account their possible negative impact, will allow to determine the specificity of regional development policy based on clusters. These problems indicated above are the subject of this study, based on the Polish and foreign literature available on the subject employing the desk research method.

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Authors and Affiliations

Sylwia Guzdek
ORCID: ORCID
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Abstract

The research was carried out on a small (52.8 ha) and shallow (4 m) Lake Track in Olsztyn, exposed to a considerably intense anthropogenic pressure. In the middle 1800s this reservoir was dried out and most of the contiguous land was designated for agricultural purposes. The lake was restored in the mid 1900s. At present, the drainage basin of Lake Track is 216 ha. Urban land comprises the largest portion of this area, i.e. 49.3%, barren land 41.4% and forests 6. I%. The lake receives storm waters but for years it had also received sanitary sewage. The results of this research allowed classifying the lake as nutrient-rich, with fairly advanced eutrophication processes. The waters were characteristic of very high nutrients content, up to 0.75 mg P/dm3 and 3.87 mg N/dm3. The high fertility of Lake Track was additionally confirmed by high BOD, values, i.e. up to 9.5 mg 0/dm3, high chlorophyll content, usually from 30 to 40 mg/m3 but reaching 123 mg/m3, and low water transparency, oscillating between 0.6 and 0.9 m. The reason for the lake's high trophic level was no doubt the excessive loading from the drainage basin. The actual nutrient runoff from the drainage basin to the lake exceeded the critical loads, as defined by Vollenweider. Low quality of the lake's waters and the parallel high external loading indicate that preventive measures should be taken, aimed at reducing the external loading.
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Authors and Affiliations

Jolanta Grochowska
Helena Gawrońska
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Abstract

The paper presents the results or the integrated assessment or environmental and human health impacts or emissions released from different sectors in Poland. The analysis was performed with the use or the curelian emissions transport model POLAIR 31) and the Regional Air Pollution Information and Simulation model RAINS. The models arc briefly described. At present, this hybrid system can operate in a simulation mode and enables estimation or the emission and concentration/deposition levels or main air pollutants, emission control costs, environmental impacts and external costs associated with different energy scenarios. Emission levels or main air pollutants in 2005, 20 I O and 2020 arc presented lor the selected energy scenario. Associated external costs and impacts on acidification have been estimated.
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Authors and Affiliations

Artur Wyrwa
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Abstract

In the present study a new energy theorem is proposed, "The two actionstheorem", which is valid in linear elastostatic problems. A new formalism concerning the works done by the external actions is introduced. Known energy theorems are proved using the proposed two-actions theorem. A composite materials problem is confronted in terms of the two actions theorem and energy relations are formulated. Finally, it is presented a study on the problems of a composed two material hollow cylinder under internal and external pressure, and of stretching of an infinite plate with an inserted elastic disc of a different material. The proposed energy relations are verified in these applications.
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Authors and Affiliations

Ioannis H. Stampouloglou
Efstathios E. Theotokoglou
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Abstract

The surface temperature of steel billets during hot rolling can reach up to 1200 °C. High temperature promotes rapid oxidation of the surface of steel billets, forming a dense oxide layer similar to fish scales. If not removed in a timely manner, it will damage the surface of the steel billets and exacerbate the wear of the rolls during the descaling process. There are many methods for descaling, but high-pressure water jet has become the main method for descaling due to its excellent descaling performance, low cost, and ease of use. The tip of the descaling nozzle serves as the main component, and its structural parameters affect the final descaling effect. This research changes the shape factor of the nozzle groove curve and the diameter of the nozzle throat, and performs computational fluid dynamics (CFD) simulations on the simplified nozzle external flow field. The axial velocity at the center of the jet generates a velocity peak at 0.5-1 Dc. The peak velocity increases with the increase of shape factor and throat diameter, and the influence of shape factor on the peak velocity is greater. For a constant target distance, the length of the velocity stable section along the jet impact line increases with the increase of the shape factor. The maximum value of dynamic pressure increases, and the smaller the target distance, the greater the dynamic pressure difference. The trend of water volume is roughly the same as that of dynamic pressure.
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Bibliography

[1] Ma, F., Li, Y. & Song, Z. M. (2011). Jet performance testing of high-pressure waterjet descaling nozzles. Advanced Materials Research. 314, 2408-2413. https://doi.org/10.4028/www.scientific.net/AMR.314-316.2408.
[2] Baofu Kou, Pengliang Huo, Xiaohua Hou, (2020). Research on the influence of external parameters of fan-type nozzle on water jet performance. Shock and Vibration. 2020, 4386259, 1-16. https://doi.org/10.1155/2020/4386259.
[3] Jiang, T., Huang, Z., Li, J., Zhou, Y. & Xiong, C. (2022). Effect of nozzle geometry on the flow dynamics and resistance inside and outside the cone-straight nozzle. ACS omega. 7(11), 9652-9665. https://doi.org/10.1021/acsomega.1c07050.
[4] Sushma, L., Deepik, A. U., Sunnam, S. K. & Madhavi, M. (2017). CFD investigation for different nozzle jets. Materials Today: Proceedings. 4(8), 9087-9094. https://doi.org/10.1016/j.matpr.2017.07.263.
[5] Gu, B., Hu, R., Wang, L., & Xu, G. (2022). Study on the influence rule of high-pressure water jet nozzle parameters on the effect of hydraulic slotting. Geofluids. 2022, 4510194. https://doi.org/10.1155/2022/4510194.
[6] Frick, J.W. (2009). Optimisation of technologies for hydro-mechanical descaling of steel. Metallurgical Research & Technology. 106(2), 60-68. https://doi.org/10.1051/ metal/2009015.
[7] Zhang, D., Wang, H., Liu, J., Wang, C., Ge, J., Zhu, Y., Chen, X. & Hu, B. (2022). Flow characteristics of oblique submerged impinging jet at various impinging heights. Journal of Marine Science and Engineering. 10(3), 399. https://doi.org/10.3390/jmse10030399.
[8] Song, X., Lyu, Z., Li, G. & Hu, X. (2017). Numerical analysis of the impact flow field of multi-orifice nozzle hydrothermal jet combined with cooling water. International Journal of Heat and Mass Transfer. 114, 578-589. https://doi.org/10.1016/j.ijheatmasstransfer.2017.06.106.
[9] Gongye, F., Zhou, J., Peng, J., Zhang, H., Peng, S., Li, S. & Deng, H. (2023). Study on the removal of oxide scale formed on 300 M steel special-shaped hot forging surfaces during heating at elevated temperature by a high-pressure water descaling process. Materials. 16, 1745, 1-14. https://doi.org/10.3390/ma16041745.
[10] Wen, J., Qi, Z., Behbahani, S. S., Pei, X. & Iseley, T. (2019). Research on the structures and hydraulic performances of the typical direct jet nozzles for water jet technology. Journal of the Brazilian Society of Mechanical Sciences and Engineering. 41, 1-12. https://doi.org/10.1007/s40430-019-2075-2.
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[12] Huang, F., Mi, J., Li, D. & Wang, R. (2020). Impinging performance of high-pressure water jets emitting from different nozzle orifice shapes. Geofluids. 2020, 8831544. https://doi.org/10.1155/2020/8831544.
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Authors and Affiliations

Bowen Yang
1
Guangqiang Liu
2
Chengcheng Xu
3
Kun Liu
1
ORCID: ORCID
Peng Han
1

  1. School of Materials and Metallurgy, University of Science and Technology Liaoning, China
  2. School of Civil Engineering, University of Science and Technology Liaoning, China
  3. Cold Rolling Mill Plant, ANGANG Steel Company Limited, China
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Abstract

The article presents a method for assessing emissions of harmful substances and noise from road and air transport, as well as a combined assessment of the emissions of these transport pollutants. The original analytical dependencies reflecting the emissions of harmful substances from road transport, developed as part of the EMITRANSYS project implemented at the Faculty of Transport of the Warsaw University of Technology, were taken into consideration, in which the unit values of the actual road emissions of harmful substances are a function of, among other things, route length or speed of the vehicles. However, the dependencies associated with noise emissions were taken from the applicable international guidelines for assessing environmental pollution by traffic noise.

The article also describes a case study in which the impact of Warsaw Chopin Airport on noise along the Warsaw road network and the entire Warsaw agglomeration was assessed. Analyses and discussions were carried out in the scope of the change in transport noise due to air operations carried out in the analysed area. As agreed, the combined impact of road and aircraft noise in the area under study is far more unfavourable than street noise alone. Thus, it can be seen that the assessment of noise levels carried out separately for individual modes of transport (in accordance with applicable regulations) should be supplemented with the assessment of traffic noise from all modes of transport – especially in the case of simulation tests of ecologically friendly changes in the area of transport.

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Authors and Affiliations

Mariusz Jacek Wasiak
Adrian Ioan Niculescu
Mirosław Kowalski
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Abstract

The offshore Oil & Gas Industry is very important to the European Union economy. Therefore it must be properly monitored and protected, and legal regulations must be in place. Directive 2013/30/EU implemented on July 18, 2018 obliged EU Member States as well as operators and owners of oil and gas related activities in sea areas to implement solutions reducing the risk of major accidents, minor accidents and dangerous situations.

The purpose of the article is to identify all the possible hazards that may occur during oil and gas operations in marine areas and attempt to assess the risk along with providing effective responses in the event of its occurrence by preparing appropriate plans for responding to the situation. For the completion of the main purpose of the work the provisions of Directive 2013/30/EU of the European Parliament and of the Council of 12 June 2013 on safety of offshore oil and gas operations were presented and analyzed using the Hazard Identification method, the analysis of available reports prepared by the European Commission, classification bodies and own experience obtained while working in the offshore industry during searching, drilling and oil and gas production located under the seabed at the Polish Economic Executive Zone. The study presents numerous analyses and comments, which were presented in the form of graphs and tables, based on international reports and own experience gained while working in an offshore company.

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Authors and Affiliations

Alicja Mrozowska
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Abstract

This paper presents a robust control technique for small-scale unmanned helicopters to track predefined trajectories (velocities and heading) in the presence of bounded external disturbances. The controller design is based on the linearized state-space model of the helicopter. The multivariable dynamics of the helicopter is divided into two subsystems, longitudinallateral and heading-heave dynamics respectively. There is no strong coupling between these two subsystems and independent controllers are designed for each subsystem. The external disturbances and model mismatch in the longitudinal-lateral subsystem are present in all (matched and mismatched) channels. This model mismatch and external disturbances are estimated as lumped disturbances using extended disturbance observer and an extended disturbance observer based sliding mode controller is designed for it to counter the effect of these disturbances. In the case of heading-heave subsystem, external disturbances and model mismatch only occur in matched channels so a second order sliding mode controller is designed for it as it is insensitive to matched uncertainties. The control performance is successfully tested in Simulink.

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Authors and Affiliations

Ihsan Ullah
Hai-Long Pei
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Abstract

The aim of this paper is to consider the not so well investigated problem of the role that language has played in Karl Marx’s thinking. The first section discusses several examples of Marxist attempts at philosophical or linguistic reflection on language. I propose the thesis that Marxist meaning theory did not seriously evolve due to the domination of the ‛Traditional Meaning Theory’ (TMT) – irrespective of the actual social conditions. In the second section I undertake some adumbrations on the tendencies of contemporary philosophy of language, such as externalism or pragmatism, whose premonitions can be found in Marx. I also point out that combined with historical materialism they can no longer fit TMT. Finally, I argue that the notion of language and the division of linguistic labor may solve some issues of Marx’s conception of ideology.

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Authors and Affiliations

Adam Klewenhagen
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Abstract

The paper discusses the relation of Wittgenstein’s philosophy to externalism. Its main claim is that even though Wittgenstein often resorted to externalist arguments in his rejection of mentalism in meaning analysis, he never adopted the externalism position – neither did he agree on internalism. Wittgenstein’s philosophy is atheoretical and therapeutic; as such, it draws on grammatical elucidations of philosophical quandaries which results in the theoretical stances reaching beyond the options admissible to either externalism or internalism.
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Bibliography

Bilgrami A. (1996), Can Externalism Be Reconciled With Self‑Knowledge? [1992], w: A. Pessin, S. Goldberg (red.), The Twin Earth Chronicles. Twenty Years of Reflection on Hilary Putnam’s “The Meaning of ‘Meaning’”, London – New York: Routledge, s. 362–395.

Burge T. (2007), Individualism and the Mental [1979], w: tenże, Foundations of Mind. Philosophical Essays, vol. 2, Toronto – New York: Oxford University Press, s. 100–150.

Burge T. (2013), Individualism and Self‑Knowledge [1988], w: Cognition Through Understanding: Self‑Knowledge, Interlocution, Reasoning, Reflection: Philosophical Essays, vol. 3, Oxford: Oxford University Press, s. 55–68.

Cavell S. (2008), Sens późnej filozofii Wittgensteina, przeł. T. Zarębski, „Principia” I.

Child W. (2010), Wittgenstein’s Externalism, w: D. Whiting (red.), The Later Wittgenstein on Language, Houndmills, Basingstoke: Palgrave Macmillan, s. 63– 80.

Davidson D. (2001), Knowing One’s Own Mind [1987], w: tenże, Subjective, Intersubjective, Objective, New York – Clarendon: Oxford University Press, s. 15–38.

Glock H.‑J., Preston J.M. (1995), Externalism and First‑Person Authority, „The Monist” 78 (4), s. 515–533.

Hacker P.M.S. (1998), Wittgenstein: Meaning and Mind. Volume 3 of an Analytical Commentary on the „Philosophical Investigations”, cz. I i II, Oxford: Blackwell.

Hacker P.M.S. (2013), Wittgenstein: Comparison and Context, Oxford: Oxford University Press.

Putnam H. (1998), Wiele twarzy realizmu i inne eseje, przeł. A. Grobler, Warszawa: Wydawnictwo Naukowe PWN.

Sawyer S. (2003), Conceptual Errors and Social Externalism, „The Philosophical Quarterly” 53, s. 265–273.

Sorgiovanni B. (2020), Wittgensteinian Content‑Externalism, „European Journal of Philosophy” 28, s. 110–125.

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Wittgenstein L. (2000b), Uwagi o podstawach matematyki, przeł. M. Poręba, Warszawa: Wydawnictwo KR.
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Authors and Affiliations

Piotr Dehnel
1
ORCID: ORCID

  1. Dolnośląska Szkoła Wyższa, ul. Strzegomska 55, 53‑611 Wrocław
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Abstract

In the skeptical tradition self-consciousness was transparent and it served as a basis for expressing doubts and developing arguments leading to certainty. After the linguistic and naturalistic turns, contemporary philosophy developed skeptical arguments against certainty and epistemic priority of the data of self-consciousness (both reflective and pre-reflective). Self-reflection reports on the stream of consciousness ex post, but the reports are meager and dependent on subject’s conceptual scheme, while the pre- -reflective data is unclear. Two contemporary skeptical hypotheses have been developed: H. Putnam’s content externalism hypothesis and so-called Kripkenstein’s quus hypothesis. I put forth the question what kind of self is immune to erroneous misidentification. The immunity seems to be limited to the contentless self, reducible to the pre-discursive feeling of one’s own existence. There is no guarantee that any content whatsoever can be attributed to self without error. I cannot negate that I exist any more than I can negate that something external exists, but any description of either is fallible. So the content of self-consciousness is not in an epistemically better position than the content of external perception.

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Authors and Affiliations

Renata Ziemińska
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Abstract

This paper considers the problem of the accurate task space finite-time control susceptible to both undesirable disturbance forces exerted on the end-effector and unknown friction forces coming from joints directly driven by the actuators as well as unstructured forces resulting from the kinematic singularities appearing on the mechanism trajectory. We obtain a class of estimated extended transposed Jacobian controllers which seem to successfully counteract the external disturbance forces on the basis of a suitably defined task-space non-singular terminal sliding manifold (TSM) and the Lyapunov stability theory. Moreover, in order to overcome (or to minimise) the undesirable chattering effects, the proposed robust control law involves the second-order sliding technique. The numerical simulations (closely related to an experiment) ran for a mobile manipulator consisting of a non-holononic platform of (2;0) type and a holonomic manipulator of two revolute kinematic pairs show the performance of the proposed controllers and make a comparison with other well-known control schemes.
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Authors and Affiliations

Mirosław Galicki
1

  1. Centrum Badan Kosmicznych Polskiej Akademii Nauk, ul. Bartycka 18A, 00-716 Warsaw, Poland
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Abstract

Numerical analysis of robustness assessment of steel planar framed structures under sudden external column removal is presented. The analysis is based on the previous experimental and numerical analyzes conducted in the Ph.D. project.Advanced and validated finite element models of steel structures with bolted end plate joints were used using Abaqus software. Six different cases of analysis using flush and extended bolted end-plate joints were performed. The actual results of the axial forces and rotations of the joints, failure models, and other important factors about structure behaviour are presented. The clear division of the results obtained depended on the type of joint used in the structure. In the cases of application of extended end-plate joints in frame analysis, the required level of robustness was reached in all cases and stopping of collapse development was obtained. In all cases of frame analysis with flush end-plate joints, an insufficient level of robustness on progressive collapse was obtained and partial failures of the structures were reached. Due to the location of the external column, the catenary actions to mitigate progressive collapse were very limited.
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Authors and Affiliations

Aleksander Kozlowski
1
ORCID: ORCID
Damian Kukla
1
ORCID: ORCID

  1. Rzeszów University of Technology, Faculty of Civil and Environmental Engineering and Architecture, Poznanska 2, 35-084 Rzeszów
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Abstract

In recent years, carbon fibres have been extensively used to strengthen concrete structures. In most cases, the lamination process is carried out using epoxy resin as matrix. In some cases, especially when strengthen structural elements made of weak concrete, it is possible to replace the epoxy resin with an inorganic, cement matrix, while at the same time maintaining a sufficient efficiency of strengthen understood as the percentage increase in the compressive strength of concrete samples due to the applied reinforcement in relation to the reference concrete. In these studies, elements of carbon fibres mats that are reinforced with a cement matrix were used as the starting product for fibre recovery. The laminate, which was used to reinforce concrete elements, was detached from the concrete surface and subjected to processing in order to obtain clean carbon fibre scraps without cement matrix. Then, the obtained carbon material, in shaped form, was used to strengthen self-compacting, high performance, fibre reinforced concrete (SCHPFRC). For comparative purposes, this concrete was also strengthened by carbon fibre mats (with one and three layers of CFRP). Each samples were tested in uniaxial compression test. The compressive strength of concrete reinforced with 1 and 3 layers of CFRP was higher by 37.9 and 96.3%, respectively, compared to the reference concrete. On the other hand, the compressive strength of concrete reinforced with 1 and 3 layers of carbon fibre scrapswas higher by 11.8 and 40.1%, respectively. Regardless of the reinforcement technique used, the composite elements showed a higher deformability limit in comparison plain concrete. The obtained results showed that it is possible to reuse carbon fibre to strengthen structural elements made of SCHPFRC effectively, using simple processing methods.
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Authors and Affiliations

Krzysztof Ostrowski
1
ORCID: ORCID
Kazimierz Furtak
1
ORCID: ORCID

  1. Cracow University of Technology, Faculty of Civil Engineering, Warszawska 24, 31-155 Cracow, Poland
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Abstract

The article is devoted to the development of a multicomponent adaptive strategy for managing Russian high-tech enterprises in modern crisis conditions. Adaptability and flexibility are considered as the most important indicators of the efficiency of structures, their ability to ensure sustainable operation and effective innovative development of high-tech enterprises. A significant place in the article is devoted to possible approaches and methods of adaptive management of the enterprise in crisis, with the help of which changes in the internal and external environment are monitored, which can be expected and random, make current operational decisions that contribute to the achievement of pre-set goals based on correction of certain tasks. The questions about the quality of adaptation, adaptive characteristics of the structure and their consistency with the level and quality of adaptation of other elements of the enterprise, conjugation of adaptability and flexibility and pace of changes are considered. A number of modern techniques related to the development of strategies for the development of high-tech enterprises in crisis conditions are analyzed. The necessity of conducting a comprehensive accounting of the crisis as the main factor associated with the uncertainty of the external environment at the stage of strategic analysis is substantiated. There is an option, in which it is possible to include the crisis and its main characteristics into the strategic three competence model of the enterprise, as an additional controlled parameter. There is a general specificity of the formation of the strategy of a high-tech enterprise in conditions of risk and uncertainty.
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Authors and Affiliations

Sergey V. Novikov
Gennady V. Tikhonov
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Abstract

The flow-induced noise mechanism of a 5000 rpm high-speed gear pump is explored. On the basis of the CFD technology and the Lighthill acoustic analogy theory, a numerical model of the flow-induced noise of a high-speed gear pump is constructed, and the effect of oil suction pressure (0.1–0.2 MPa) on the internal flow field and flow-induced noise characteristics of the high-speed gear pump is investigated. To evaluate the accuracy of the numerical simulation, a noise testing platform for high-speed gear pumps was developed. Adding an oil replenishment groove to the high-speed gear pump suppresses its flow-induced noise. The results indicate that the discrete noise at the fundamental frequency and its harmonic frequency is the primary component of the flow-induced noise of the pump and that the oil-trapped area is the principal source of vibration. The overall sound pressure level of flow-induced noise in the inlet and outlet areas decreases with distance from the oil-trapped area, and the sound pressure level in the outlet area is greater than that in the inlet area. The oil replenishment groove may considerably minimize cavitation noise, enhance the oil absorption capacity, and reduce the outer field’s overall sound pressure level by 4–5 dB.
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Authors and Affiliations

Peng Zhan
1
Yan Qiang
1
Zhiyuan Jiang
1
Runxue Yang
1
Liejiang Wie
1

  1. Energy and Power Engineering College, Lanzhou University of Technology Qilihe District, Lanzhou, Gansu Province, P.R. China

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