Wyniki wyszukiwania - Biblioteka Nauki

1

Effect of annealing on the structural properties of arsenic-implanted mercury cadmium telluride

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Izhnin I. , Fitsych O. I. , Świątek Z. , Morgiel Y. , Bonchyk O. Y. , Savytskyy H. V. , Mynbaev K. , Voitsekhovskii A. V. , Korotaev A. G. , Yakushev M. V. , Marin D. V. , Varavin V. S. , Dvoretsky S. A.

Opto-Electronics Review

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2019

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tom Vol. 27, No. 1

14--17

EN

Effect of annealing on the structural properties of arsenic-implanted mercury cadmium telluride film grown by molecular beam epitaxy was studied with the use of transmission electron microscopy and optical reflection. Strong influence of the graded-gap surface layer grown on top of the film on the behaviour of implantation-induced defects under arsenic activation annealing was revealed and interpreted.

2

Current concepts of articular cartilage repair

100%

Mierzwiński M. , Ficek K.

Engineering of Biomaterials

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2018

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tom Vol. 21, no. 148

115

3

Post-implantation defects instability under 1 MeV electron irradiation in GaAs

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Warchoł S. , Rzewuski H. , Krynicki J. , Grötzschel R.

Nukleonika

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2000

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tom Vol. 45, nr 4

225-228

EN

The influence of 1 MeV electron irradiation on the stability of post-implantation defects in GaAs has been investigated. The n-type GaAs wafers of <100> orientation were implanted with 150 keV As+ ions below the amorphization threshold at RT using the implantation dose of 2×1013 ions cm–2 at a constant flux of 0.1 žA cm–2. Then the implanted samples were irradiated with a scanned beam of 1 MeV electrons from a Van de Graaff accelerator in a dose range (0.5–5.0)×1017 cm–2 at 320 K. RBS and channeling spectroscopy of 1.7 MeV 4He+ ions were used to determine the depth distribution of defect concentration before and after 1 MeV irradiations. New results of an "oscillatory" behaviour of the damage level as a function of 1 MeV electron fluence are presented.

4

BIomechanical aspects of artificial joint implantation in a lower limb

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Będziński R. , Bernakiewicz M. , Ścigała K.

Journal of Theoretical and Applied Mechanics

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1999

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tom nr 3

455-479

EN

One of the most important trends in engineering biomechanics is experimental and numerical analysis of the stress and strain state existing in organs subject to a heavy load; e.g., the knee and hip joints. Clinical tests experimental and numerical studies on design of implants replacing damaged organs are also of crucial importance in development of biomechanics. The research is focused on determination of loads, experimental techniques as well as on simplifications assumed in measurements and applied models. The conducted investigations were concerned with estimation of mechanical behaviour of hip and knee implants after arthoplasty. The experimental tests on both the real objects and models were performed. Numerical simulation was made by using the finite element method. The tests have proved that from the biomechanical point of view proper selection of endoprothesis is of crucial importance for achieving positive long-term results of alloplasty.

PL

Jednym z najważniejszych kierunków badań w dziedzinie biomechaniki inżynierskiej jest doświadczalna i numeryczna analiza stanu odkształceń i naprężeń w organach ludzkich poddanych znacznym obciążeniom, jak chociażby staw biodrowy i kolanowy. Badania kliniczne, doświadczalne i numeryczne poświęcone konstrukcji elementów zastępujących uszkodzone elementy ciała ludzkiego stanowią jeden z najważniejszych kierunków biomechaniki. Dyskusje na tym tle skoncentrowane są na problemach beterminacji występującego stanu obciążenia, stosowanych technik pomiarowych oraz uproszczeń warunków pomiaru i przyjmowanych modeli. Przeprowadzone badania poświęcone zostały ocenie mechanicznej współpracy sztucznych elementów stawu biodrowego i kolanowego w warunkach modelowych, jak i metodą symulacji numerycznej, metodą elementów skończonych. Badania udowodniły duże znaczenie prawidłowej selekcji endoprotez z punktu widzenia biomechaniki układu na długoterminowe powodzenie alloplastyk.

5

Magnetic properties of silicon crystals implanted with manganese

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Osinniy V. , Misiuk A. , Szot M. , Świątek K. , Bąk-Misiuk J. , Barcz A. , Jung W. , Prujszczyk M. , Story T.

Materials Science Poland

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2008

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tom Vol. 26, No. 3

751--757

EN

The influence of thermal treatment on magnetic properties of Si/Mn crystals grown by the Czochralski and by floating zone methods and implanted with Mn+ ions was studied by the SQUID magnetometry and electron spin resonance. Depending on thermal and hydrostatic pressure annealing conditions, three groups of Si/Mn samples were found: samples with only ferromagnetic phase, samples with ferromagnetic and paramagnetic contributions, and diamagnetic samples. The Curie temperature of ferromagnetic phase exceeds room temperature. The ESR and SQUID measurements suggest that Si/Mn implanted layer is magnetically inhomogeneous.

6

Radiological changes in maxillary sinus morphology after lateral sinus floor augmentation

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Shpachynskyi O. , Didkovskij V. , Kopchak A.

Otolaryngologia Polska

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2021

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tom 75(2)

34-41

EN

Background: Restoration of the masticatory function in patients with edentulous posterior maxilla is often challenging due to the severe atrophy of the alveolar ridges and proximity of the maxillary sinus, resulting in insufficient bone quantity for implant-supported dentures. Aim: The purpose of this study was to analyze the changes in Schneiderian membrane thickness after lateral sinus floor augmentation (LSFA) using cone beam computed tomography (CBCT). Material and methods: WLSFA procedures using different bone grafting materials were performed in 87 patients, operated on in two clinical institutions from 2016 to 2018. CBCT examination was performed in all patients before the LSFA procedure, at 1 month after surgery, and after 6 months, before implant placement or loading. Results: Minor r adiological changes in mucous membrane morphology were observed preoperatively in 17.1% of patients. Postoperative CBCT in the early postsurgical period demonstrated that the number of intact non-specific sinuses decreased significantly, i.e. from 86.7% to 26.7%. The number of cases with local hypertrophia of the mucous membrane increased from 20.3% to 26.7%. Mucosal thickening was observed in 41.7% vs 7.5%. The number of intact sinuses increased to 57.8%. The number of cases with local membrane hypertrophia also increased – to 37.4%. The number of cases with mucosal thickening or fluid accumulation decreased significantly to 11.8 and 5.3% respectively. In 2 cases the development of chronic sinusitis required secondary surgeries. Conclusion: The present retrospective study revealed that minor radiological changes in the morphology of the maxillary sinus mucosa were observed preoperatively in 17.1% of patients who underwent LSFA procedures. In the early and late postoperative period their frequency increased to 68.5% and 47.1%, respectively. However, the clinical signs of sinusitis developed only in 19.26% of patients. No significant correlations were found between the frequency and severity of postoperative radiological changes and residual bone height, sinus anatomy, initial state of the mucous membrane and type of the grafting material.

7

Histological evaluation of the soft tissue reaction after implantation of hernia polypropylene meshes

100%

Żywicka B. , Pielka S. , Paluch D. , Solski L. , Szymonowicz M. , Struszczyk A. M. H.

Engineering of Biomaterials

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2009

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tom Vol. 12, no. 89-91

34--37

8

Radiological changes in maxillary sinus morphology after lateral sinus floor augmentation

100%

Shpachynskyi O. , Didkovskij V. , Kopchak A.

Polish Journal of Otolaryngology

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2021

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tom 75

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nr 2

34-41

EN

Background: Restoration of the masticatory function in patients with edentulous posterior maxilla is often challenging due to the severe atrophy of the alveolar ridges and proximity of the maxillary sinus, resulting in insufficient bone quantity for implant-supported dentures. Aim: The purpose of this study was to analyze the changes in Schneiderian membrane thickness after lateral sinus floor augmentation (LSFA) using cone beam computed tomography (CBCT). Material and methods: WLSFA procedures using different bone grafting materials were performed in 87 patients, operated on in two clinical institutions from 2016 to 2018. CBCT examination was performed in all patients before the LSFA procedure, at 1 month after surgery, and after 6 months, before implant placement or loading. Results: Minor r adiological changes in mucous membrane morphology were observed preoperatively in 17.1% of patients. Postoperative CBCT in the early postsurgical period demonstrated that the number of intact non-specific sinuses decreased significantly, i.e. from 86.7% to 26.7%. The number of cases with local hypertrophia of the mucous membrane increased from 20.3% to 26.7%. Mucosal thickening was observed in 41.7% vs 7.5%. The number of intact sinuses increased to 57.8%. The number of cases with local membrane hypertrophia also increased – to 37.4%. The number of cases with mucosal thickening or fluid accumulation decreased significantly to 11.8 and 5.3% respectively. In 2 cases the development of chronic sinusitis required secondary surgeries. Conclusion: The present retrospective study revealed that minor radiological changes in the morphology of the maxillary sinus mucosa were observed preoperatively in 17.1% of patients who underwent LSFA procedures. In the early and late postoperative period their frequency increased to 68.5% and 47.1%, respectively. However, the clinical signs of sinusitis developed only in 19.26% of patients. No significant correlations were found between the frequency and severity of postoperative radiological changes and residual bone height, sinus anatomy, initial state of the mucous membrane and type of the grafting material.

9

Mechanical and tribological properties of A-C:H/Ti coatings doped by silver using ion implantation and magnetron sputtering methods : abstract

100%

Szymański W. , Kołodziejczyk L. , Batory D. , Czerniak-Reczulska M. , Bociaga D. , Rajchel B.

Engineering of Biomaterials

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2013

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tom Vol. 16, no. 122-123 spec. iss.

2

EN

Due to favorable mechanical, tribological and biomedical properties the carbon coatings are of interest of many branches of the industry [1]. Growing interest in Ag doped DLC coatings is observed within the space of the last several years. Both, well known antibacterial properties [2] of silver as well as a good biocompatibility [3] of carbon coatings constitute the outstanding solution for a variety of applications, especially for medical implants. The aim of this study was the evaluation of influence of silver onto the mechanical and tribological properties of nanocomposite DLC coatings. Carbon coatings were produced using a hybrid RFPACVD/MS method and silver ions were incorporated into carbon matrix. The processes consist of followed stages: synthesis of nanocomposite carbon (CVD) doped titanium coatings (PVD)[4] and next stage carbon (CVD) and silver deposition (PVD)or Ag ion implantation into carbon coating. Carbon layers synthesis was performed with use of the classic RF PACVD process in methane atmosphere whereas as the titanium ions source the pulsed magnetron sputtering (MS) process was applied. Second stage was performed in the same reaction chamber but the PVD process was carried out using the silver cathode. The ion implantation process was carried out with the use of silver ions with energy of 15 keV. In order to determine the influence of silver ion implantation process onto overall physiochemical properties of carbon coatings four ion doses of 2,4,7 and 10×1016Ag+/cm2 were applied. Due to application of the gradient of chemical composition of Ti–C it is possible to manufacture thick and well adherent carbon layers with a very good mechanical, tribological parameters and corrosion resistive. Application of silver as a doping material allowed modification of the mechanical and biological properties of manufactured layers depending on the silver amount (C:Ag ratio).

10

Initial biocompatibility assessment of ceramic material intended for application in implantable heart assist device

100%

Janiczak K. , Zawidlak-Węgrzyńska B. , Gawlikowski M. , Gonsior M. , Kustosz R.

Engineering of Biomaterials

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2017

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tom Vol. 20, no. 143 spec. iss.

67

11

Development and optimization of myocardial tissue culture in ovo

100%

Hotowy A. , Sawosz E. , Grodzik M. , Wierzbicki M. , Kutwin M. , Jaworski S. , Chwalibog A.

Engineering of Biomaterials

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2017

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tom Vol. 20, no. 143 spec. iss.

54

12

Angular dependence of post-implantation damage recovery under 1 MeV electron irradiation in GaAs

100%

Warchoł S. , Rzewuski H. , Krynicki J. , Grotzschel R.

Nukleonika

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2002

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tom Vol. 47, nr 1

19-21

EN

The angular dependence of post-implantation defects removal in GaAs irradiated with 1 MeV electrons from a Van de Graaff accelerator has been investigated. The possible way of enhancing defect annealing consists in ionization created by electron irradiation. In this paper new results of a damage level behaviour dependent on 1 MeV electron beam angle irradiation are presented. GaAs single crystals of <100> orientation were implanted with 150 keV As+ ions at RT and then irradiated with a scanning beam of 1 MeV electrons at some selected angles. Rutheford Backscattering Spectroscopy (RBS) of 1.7 MeV 4He+ ions were used to determine the depth distribution of defect concentration before and after electron irradiation. The results relate clearly the ionization intensity created by the electron beam with angle of incidence with respect to the GaAs <100> orientation.

13

Multi-energy ion implantation from high-intensity laser

100%

Cutroneo M. , Torrisi L. , Ullschmied J. , Dudzak R.

Nukleonika

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2016

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tom Vol. 61, No. 2

109--113

EN

The laser-matter interaction using nominal laser intensity above 1015 W/cm2 generates in vacuum non- -equilibrium plasmas accelerating ions at energies from tens keV up to hundreds MeV. From thin targets, using the TNSA regime, plasma is generated in the forward direction accelerating ions above 1 MeV per charge state and inducing high-ionization states. Generally, the ion energies follow a Boltzmann-like distribution characterized by a cutoff at high energy and by a Coulomb-shift towards high energy increasing the ion charge state. The accelerated ions are emitted with the high directivity, depending on the ion charge state and ion mass, along the normal to the target surface. The ion fluencies depend on the ablated mass by laser, indeed it is low for thin targets. Ions accelerated from plasma can be implanted on different substrates such as Si crystals, glassy-carbon and polymers at different fluences. The ion dose increment of implanted substrates is obtainable with repetitive laser shots and with repetitive plasma emissions. Ion beam analytical methods (IBA), such as Rutherford backscattering spectroscopy (RBS), elastic recoil detection analysis (ERDA) and proton-induced X-ray emission (PIXE) can be employed to analyse the implanted species in the substrates. Such analyses represent ‘off-line’ methods to extrapolate and to character the plasma ion stream emission as well as to investigate the chemical and physical modifications of the implanted surface. The multi-energy and species ion implantation from plasma, at high fluency, changes the physical and chemical properties of the implanted substrates, in fact, many parameters, such as morphology, hardness, optical and mechanical properties, wetting ability and nanostructure generation may be modified through the thermal-assisted implantation by multi-energy ions from laser-generated plasma.

14

Ti6Al7Nb alloy surface improvement for implantable blood pumps applications

100%

Gonsior M. , Tarnowski M. , Janiczak K. , Zawidlak-Węgrzyńska B. , Wierzchoń T. , Gawlikowski M. , Kustosz R.

Engineering of Biomaterials

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2017

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tom Vol. 20, no. 143 spec. iss.

65

15

The in vitro analysis of thin films based on chitosan/tannic ACID

75%

Kaczmarek B. , Miłek O. , Nadolna K. , Owczarek A. , Kleszczyński K. , Osyczka A. M.

Engineering of Biomaterials

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2019

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tom Vol. 22, no. 153 spec. iss.

34

16

Analysis of bone wedge dimension selectionmethods in high tibial osteotomy

75%

Urbanowski S. , Łuczkiewicz P. , Grymek S.

Advances in Materials Science

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2019

|

tom Vol. 19, nr 2(60)

15--27

EN

The article presents the analysis of methods for selecting dimensions of bone wedge for high tibial osteotomy. The existing methods are described along with the procedure. In the following paragraphs, deficiencies in the selection of bone wedge dimensions and global trends in this field have been demonstrated. Based on the numerical analysis, the problem appearing in the wrong choice of bone wedge dimensions was illustrated.

17

Status of the Warsaw ECR ion source and injection line

75%

Sudlitz K. , Kulczycka E. , Filipiak B. , Górecki A.

Nukleonika

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2003

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tom Vol. 48,suppl.2

105-108

EN

A room temperature home built 10 GHz ECR ion source delivers beams of B, C, N, O, F, Ne, S, Ar to the Cyclotron U200-P. The same ion source has also been used for surface irradiation of the solids. To upgrade the ion source and increase the ion current in the cyclotron an oven for evaporation of solid materials has been constructed and a two gap buncher has been installed in the injection line. Some new observations on the influence of the extraction system on the ion beam current will be presented.

18

Microstructure of Czochralski silicon co-implanted with helium and hydrogen and treated at high temperature and pressure

75%

Misiuk A. , Barcz A. , Surma B. , Bąk-Misiuk J. , Wnuk A.

Opto-Electronics Review

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2004

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tom Vol. 12, No. 4

383-387

EN

The effect of high temperature (HT) up to 1400 K and high pressure (HP) up to 1.1 GPa on Cz-Si co-implanted with He⁺ (energy, E = 50 KeV, dose, DHe = 5x10¹⁶ cm⁻²) and H₂⁺ (E = 135 KeV, DH 5x10¹⁶ cm⁻²), with almost overlapping implantation- disturbed layers, has been investigated. Numerous extended defects are created at HT and HP near the He and H concentration peaks, the overall structural perfection of annealed Si:He,H improves with HP. Oxygen gettering in the implantation- disturbed areas is much less pronounced under HP. The observed effects are related, among others, to decreased hydrogen out-diffusion and lowered dimensions of gas filled defects in Si:He,H treated under HP. Qualitative explanation of HP-mediated gettering of oxygen has been proposed.

19

Polypropylene surface modified hollow fibers for immunoisolation of cells

75%

Granicka L. H. , Chwojnowski A. , Kawiak J.

Biocybernetics and Biomedical Engineering

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2004

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tom Vol. 24, no. 2

59-67

EN

Membranes preventing the tissue overgrowth as well as toxic influence of the environment on cells encapsulated within them were elaborated. The permiselective polypropylene hollow fibers were modified using different methods of silanization, and the effect of silanization on the membrane transport properties as well as on the tissue overgrowth was assessed, in the light of their perspective application in encapsulation of the cells. The membrane's pressure silanization has been found to result in obtaining membranes allowing to decrease and/ or delimit the diffusive transport through the membrane of large solutes without a simultaneous transport change for small solutes. The applied different types of membrane's silanization allowed to avoid a massive tissue overgrowth during the implantation. The membranes have been found to comply with the requirements for membranes applied in immunoisolation.

20

Biomechanika inżynierska stan obecny i perspektywy rozwoju

75%

Będziński R.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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1999

|

tom z. 10

15-22

PL

Inżynierowie biomechanicy, lekarze medycyny, rehabilitacji muszą wspólnym wysiłkiem podejmować badania interdyscyplinarne dotyczące przywracania funkcji życiowych człowieka. W pracy przedstawiono podstawowe problemy biomechaniki inżynierskiej w szczególności dotyczące implantacji, przebudowy struktur kostnych. Na podstawie literatury oraz doświadczeń własnych przedstawiono przykłady koniecznej współpracy lekarzy i inżynierów aktualnie oraz w przyszłości.

EN

Biomechanics, life scientists and physicians have teamed together and functioned with a combined effort in many interdisciplinary fields of endeavour. The paper deals with basic problems of engineering biomechanics, especially implantation, remodelling, shielding. Basing on the literature and own experience, examples of co-operation between engineers and medical doctors arc discussed together with future tendencies of development of biomechanics engineering.