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Abstract

This article focuses on mobility of companies in the European Union in the light of the Court of Justice’s judgment in the C-106/16 Polbud – Wykonawstwo sp. z o.o. case. The Court of Justice has once again interpreted the treaty provisions relating to the EU freedom of establishment in the context of cross-border conversion of companies. The in-depth analysis of the case from the substantive law perspective as well as from the conflict-of-law perspective has raised some doubts with regard to the background of the judgment. Therefore, the article assesses whether the cross-border transfer of a seat took place in the Polbud case or the cross-border conversion, or possibly a new company has come into existence. Most of the analysis is aimed at exposing the risks related to the companies’ mobility under the rules adopted in the Polbud judgment, in particular in the absence of respective European and national regulation.

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Authors and Affiliations

Sylwia Majkowska-Szulc
Arkadiusz Wowerka
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Abstract

Every bone implant to work correctly after implantation needs to integrate with the surrounding bone. To enhance such a process, called osseointegration, various techniques of implant surface modification emerged. One of the approaches is based on the deposition of nano- and submicron materials on the implant surface. This paper presents a solution blow spinning process for producing poly-L-lactic acid (PLLA)/ceramic fibrous composites designed to be deposited directly onto orthopaedic implants prior to implantation to increase osseointegration. We produced plain PLLA fibrous materials for comparison, and fibrous composite materials with ��-tricalcium phosphate (��TCP), hydroxyapatite nanoparticles (nHAp) and hydroxyapatite nanoparticles modified with lecithin (nHAp-LE). We performed the structural analysis of produced materials with scanning electron microscopy, gravimetric determination of porosity, and water contact angle measurement. We also used infrared spectroscopy, Alizarin Red S staining, and cytotoxicity evaluation to conclude that PLLA/nHAp-LE composite material shows the most promising properties to be applied as surface modification of bone implants. To visualise fibrous composite deposition on implants, we used two models: titanium plate and stainlesssteel bolt. Thus, we showed that the solution blow spun materials can be used for surface modification of orthopaedic implants.
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Bibliography

Abdal-hay A., Hamdy A.S., Khalil K.A., Lim J.H., 2015. A novel simple one-step air jet spinning approach for deposition of poly(vinyl acetate)/hydroxyapatite composite nanofibers on Ti implants. Mater. Sci. Eng., C, 49, 681–690. DOI: 10.1016/j.msec.2015.01.008.
Abdal-hay A., Hasan A., Yu-Kyoung, Lee M.-H., Hamdy A. S., Khalil K.A., 2016. Biocorrosion behavior of biodegradable nanocomposite fibers coated layer-by-layer on AM50 magnesium implant. Mater. Sci. Eng., C, 58, 1232–1241. DOI: 10.1016/j.msec.2015.09.065.
Abdal-hay A., Sheikh F.A., Lim J.K., 2013. Air jet spinning of hydroxyapatite/poly(lactic acid) hybrid nanocomposite membrane mats for bone tissue engineering. Colloids Surf., B, 102, 635–643. DOI: 10.1016/j.colsurfb.2012.09.017.
Balakrishnan H., Hassan A., Imran M., Wahit M.U., 2012. Toughening of polylactic acid nanocomposites: A short review. Polymer-Plastics Technol. Eng., 51, 175–192. DOI: 10.1080/03602559.2011.618329.
Behrens A.M., Casey B.J., Sikorski M.J., Wu K.L., Tutak W., Sandler A.D., Kofinas P., 2014. In situ deposition of PLGA nanofibers via solution blow spinning. ACS Macro Lett., 3, 249–254. DOI: 10.1021/mz500049x.
Bonan R.F., Mota M.F., da Costa Farias R.M., Silva S.D., Bonan P.R.F., Diesel L., Menezes R.R., da Cruz Perez D.E., 2019. In vitro antimicrobial and anticancer properties of TiO2 blow-spun nanofibers containing silver nanoparticles. Mater. Sci. Eng., C, 104, 109876. DOI: 10.1016/j.msec.2019.109876.
Carlsson L., Röstlund T., Albrektsson B., Albrektsson T., Brånemark P.-I., 1986. Osseointegration of titanium implants. Acta Orthop. Scand., 57, 285–289. DOI: 10.3109/17453678608994393.
Civantos A., Martínez-Campos E., Ramos V., Elvira C., Gallardo A., Abarrategi A., 2017. Titanium coatings and surface modifications: Toward clinically useful bioactive implants. ACS Biomater. Sci. Eng., 3, 1245–1261. DOI: 10.1021/acsbiomaterials.6b00604.
Costa R.G.F., Brichi G.S., Ribeiro C., Mattoso L.H.C., 2016. Nanocomposite fibers of poly(lactic acid)/titanium dioxide prepared by solution blow spinning. Polym. Bull., 73, 2973–2985. DOI: 10.1007/s00289-016-1635-1.
Daristotle J.L., Behrens A.M., Sandler A.D. Kofinas P., 2016. A review of the fundamental principles and applications of solution blow spinning. ACS Appl. Mater. Interfaces, 8, 34951–34963. DOI: 10.1021/acsami.6b12994.
Deneff J.I.,Walton K.S., 2019. Production of metal-organic framework-bearing polystyrene fibers by solution blow spinning. Chem. Eng. Sci., 203, 220–227. DOI: 10.1016/j.ces.2019.03.012.
Ferreira T.P.M., Nepomuceno N.C., Medeiros E.L.G., Medeiros E.S., Sampaio F.C., Oliveira J.E., Oliveira M.P., Galvão L.S., Bulhões E.O., Santos A.S.F., 2019. Antimicrobial coatings based on poly(dimethyl siloxane) and silver nanoparticles by solution blow spraying. Prog. Org. Coat., 133, 19–26. DOI: 10.1016/j.porgcoat.2019.04.032.
François S., Chakfé N., Durand B., Laroche G., 2009. A poly(l-lactic acid) nanofibre mesh scaffold for endothelial cells on vascular prostheses. Acta Biomater., 5, 2418–2428. DOI: 10.1016/j.actbio.2009.03.013.
Gregory C.A., Gunn W.G., Peister A., Prockop D.J., 2004. An Alizarin red-based assay of mineralisation by adherent cells in culture: comparison with cetylpyridinium chloride extraction. Anal. Biochem., 329, 77–84. DOI: 10.1016/j.ab.2004.02.002.
Huang Y., Song J., Yang C., Long Y., Wu H., 2019. Scalable manufacturing and applications of nanofibers. Mater. Today, 28, 98–113. DOI: 10.1016/j.mattod.2019.04.018.
Jang J.-H., Castano O., Kim H.-W., 2009. Electrospun materials as potential platforms for bone tissue engineering. Adv. Drug Delivery Rev., 61, 1065–1083. DOI: 10.1016/j.addr.2009.07.008.
Kopec K.,Wojasinski M., Ciach T., 2020. Superhydrophilic polyurethane/polydopamine nanofibrous materials enhancing cell adhesion for application in tissue engineering. Int. J. Mol. Sci., 21, 6798. DOI: 10.3390/ijms21186798.
Latocha J., Wojasinski M., Jurczak K., Gierlotka S., Sobieszuk P., Ciach T., 2018. Precipitation of hydroxyapatite nanoparticles in 3D-printed reactors. Chem. Eng. Process. Process Intensif., 133, 221–233. DOI: 10.1016/j.cep.2018.10.001.
Lewis R.J., Sr (Ed.), 1997. Hawley’s Condensed chemical dictionary. 13th edition. John Wiley & Sons, Inc., New York, NY, p. 88. Li J.P., Habibovic P., van den Doel M., Wilson C.E., de Wijn J.R., van Blitterswijk C.A., de Groot K., 2007. Bone ingrowth in porous titanium implants produced by 3D fiber deposition. Biomaterials, 28, 2810–2820. DOI: 10.1016/j.biomaterials.2007.02.020.
McEvoy G.K. (Ed.), 1992. American hospital formulary service – Drug information 92. American Society of Hospital Pharmacists, Inc., Bethesda, MD (Plus Supplements 1992), 276.
Medeiros E.L.G., Gomes D.S., Santos A.M.C., Vieira R.H., de Lima I.L., Rocha F.S., de S. Castro-Filice L., Medeiros E.S., Neves G.A., Menezes R.R., 2021. 3D nanofibrous bioactive glass scaffolds produced by one-step spinning process. Ceram. Int., 47, 102–110. DOI: 10.1016/j.ceramint.2020.08.112.
Medeiros E.S., Glenn G.M., Klamczynski A.P., Orts W.J., Mattoso L.H.C., 2009. Solution blow spinning: A new method to produce micro- and nanofibers from polymer solutions. J. Appl. Polym. Sci. 113, 2322–2330. DOI: 10.1002/app.30275.
Ravichandran R., Ng C.C., Liao S., Pliszka D., Raghunath M., Ramakrishna S., Chan C.K., 2012. Biomimetic surface modification of titanium surfaces for early cell capture by advanced electrospinning. Biomed. Mater., 7, 015001. DOI: 10.1088/1748-6041/7/1/015001.
Reneker D.H., Yarin A.L., 2008. Electrospinning jets and polymer nanofibers. Polymer, 49, 2387–2425. DOI: 10.1016/j.polymer.2008.02.002.
Roseti L., Parisi V., Petretta M., Cavallo C., Desando G., Bartolotti I., Grigolo B., 2017. Scaffolds for bone tissue engineering: State of the art and new perspectives. Mater. Sci. Eng., C, 78, 1246–1262. DOI: 10.1016/j.msec.2017.05.017.
Schindelin J., Arganda-Carreras I., Frise E., Kaynig V., Longair M., Pietzsch T., Preibisch S., Rueden C., Saalfeld S., Schmid B., Tinevez J.-Y., White D.J., Hartenstein V., Eliceiri K., Tomancak P., Cardona A., 2012. Fiji: an opensource platform for biological-image analysis. Nat. Methods, 9, 676–682. DOI: 10.1038/nmeth.2019.
Sharma B., Elisseeff J.H., 2004. Engineering structurally organised cartilage and bone tissues. Ann. Biomed. Eng., 32, 148–159. DOI: 10.1023/b:abme.0000007799.60142.78.
Tammaro L., Vittoria V., Wyrwa R., Weisser J., Beer B., Thein S., Schnabelrauch M., 2014. Fabrication and characterisation of electrospun polylactide/��-tricalcium phosphate hybrid meshes for potential applications in hard tissue repair. BioNanoMaterials, 15, 9–20. DOI: 10.1515/bnm-2014-0001.
Tomecka E., Wojasinski M., Jastrzebska E., Chudy M., Ciach T., Brzozka Z., 2017. Poly(L-lactic acid) and polyurethane nanofibers fabricated by solution blow spinning as potential substrates for cardiac cell culture. Mater. Sci. Eng., C, 75, 305–316. DOI: 10.1016/j.msec.2017.02.055.
Tutak W., Sarkar S., Lin-Gibson S., Farooque T.M., Jyotsnendu G., Wang D., Kohn J., Bolikal D., Simon C.G., 2013. The support of bone marrow stromal cell differentiation by airbrushed nanofiber scaffolds. Biomaterials, 34, 2389–2398. DOI: 10.1016/j.biomaterials.2012.12.020.
Wojasinski M., Pilarek M., Ciach T., 2014. Comparative studies of electrospinning and solution blow spinning processes for the production of nanofibrous poly(L-lactic acid) materials for biomedical engineering. Pol. J. Chem. Technol., 16, 43–50. DOI: 10.2478/pjct-2014-0028.
Zhang L., Kopperstad P.,West M., Hedin N., Fong H., 2009. Generation of polymer ultrafine fibers through solution (air-) blowing. J. Appl. Polym. Sci., 114, 3479–3486. DOI: 10.1002/app.30938.
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Authors and Affiliations

Michał Wojasiński
1
Tomasz Ciach
1 2
ORCID: ORCID

  1. Warsaw University of Technology, Faculty of Chemical and Process Engineering, Warynskiego 1, 00-645 Warsaw, Poland
  2. Warsaw University of Technology, Centre for Advanced Materials and Technologies CEZAMAT, Poleczki 19, 02-822 Warsaw, Poland
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Abstract

We study the autocovariance structure of a general Markov switching second-order stationary VARMA model.Then we give stable finite order VARMA(p*, q*) representations for those M-state Markov switching VARMA(p, q) processes where the observables are uncorrelated with the regime variables. This allows us to obtain sharper bounds for p* and q* with respect to the ones existing in literature. Our results provide new insights into stochastic properties and facilitate statistical inference about the orders of MS-VARMA models and the underlying number of hidden states.

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Authors and Affiliations

Maddalena Cavicchioli
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Abstract

Józef Andrzej Gierowski’s academic profile is presented in the light of his interest in the problems of universal history in relation to events, but above all to phenomena which allow for a better knowledge and understanding of the mentality of the people of the time, their activities and their consequences. Gierowski’s studies on the history of Europe were closely linked to the history of the Polish‑Lithuanian Commonwealth (especially the period of the Saxon Wettin dynasty on the Polish throne), highlighting its international position and associations, and the resulting foreign policy of its rulers. Among the questions raised, there was no shortage of issues relating to the culture and ideology of the Baroque and the Enlightenment and, of primary interest to the researcher, the problem‑laden, not fully deciphered transition period between the two currents.
The second ‘part’ of the article emphasises Józef Andrzej Gierowski’s understanding of Europe as a certain whole, encompassing not only political history, social or economic affairs, but also cultural patterns and phenomena to which he was particularly sensitive.
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Authors and Affiliations

Andrzej K. Link Lenczowski
1
ORCID: ORCID

  1. Uniwersytet Jagielloński
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Abstract

This paper presents the results of Pilot Assisting Module research performed on two light aircraft flight simulators developed in parallel at Brno University of Technology, Czech Republic, and Rzeszow University of Technology, Poland. The first simulator was designed as an open platform for the verification and validation of the advanced pilot/aircraft interface systems and inherited its appearance from the cockpit section of the Evektor SportStar. The second flight simulator, the XM-15, has been built around the cockpit of a unique agriculture jet Belfegor. It introduced a system architecture that supports scientific simulations of various aircraft types and configurations, making it suitable for conceptual testing of Pilot Assisting Module. The XM-15 was initially designed to support research on advanced flight control systems, but due to its continuing modernization it evolved into a hardware-in-the-loop test-bed for electromechanical actuators and autopilot CAN based controller blocks. Pilot-in-the-loop experiments of proposed Pilot Assisting Module revealed favorable operational scenarios, under which the proposed system reduces the cockpit workload during single pilot operations.

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Authors and Affiliations

Peter Chudy
Pawel Rzucidlo

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