Search results for: OCT

1D portable optical coherence tomography system

Publication

- Photonics Letters of Poland - Year 2018

—Imaging methods are an expanding branch of technology, which involves data acquisition and analysis of images for research and diagnostics. This paper has been devoted to the description of the optical design for a one-dimensional, portable optical coherence tomography (OCT) system. The Mach-Zehnder interferometer has been designed in the presented study. The description of the construction and applied hardware solutions have...

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NEW ORGANIC MATERIALS FOR PHOTOVOLTAICS

Publication

B. Hajduk

- Year 2011

This report presents the results of investigations carried out for polymer- and low-weightmolecular materials prepared in the form of thin films by various methods, namely the thermalvacuum evaporation and chemical vapour deposition. The influence of the technologicalconditions on the structure, surface morphology, and electronic properties of selected organic thinfilms, including polyazomethines, phthalocyanines, and perylene...

Nagranie formy muzycznej w systemie stereofonii dookólnej

Publication

M. Kalinowski
M. Wilk
B. Kostek

- Year 2009

Celem pracy była realizacja nagrania kwintetu jazzowego w wybranych systemach stereofonii wielokanałowej. Dodatkowym celem było przeprowadzenie testów subiektywnych zrealizowanych nagrań. W pracy zawarto w pierwszej kolejności zagadnienia związane z przestrzenną lokalizacją źródeł dźwięku przez człowieka. W dalszej części przywołane zostały wybrane techniki mikrofonowe stereofonii wielokanałowej, a także metody prowadzenia testów...

Detection system for optical coherence tomography: Czerny-Turner spectrometer

Publication

A. M. Kamińska

- Year 2017

Research methods based on spectral analysis have powerful impact on development in many field of science. Signal spectrum can be a source of useful and important data. It enables to obtain information about physical and chemical properties of tested materials. This paper has been devoted to describe optical design for high resolution spectrometer, which is significant element of optical coherence tomography (OCT) systems. Designed...

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Study of Cloud Water Samples Collected over Northern Poland

Publication

Ż. Polkowska
M. Błaś
D. Lech
J. Namieśnik

- JOURNAL OF ENVIRONMENTAL QUALITY - Year 2014

The paper gives the results of the first studies on the chemistry of cloud water collected during 3 mo (Aug.–Oct. 2010) in the free atmosphere over the area to the south of the Tri-City (Gdansk-Sopot-Gdynia) conurbation on the Gulf of Gdansk, Poland. Taken from cumulus, stratus, and stratocumulus clouds by means of an aircraft-mounted collector, the water samples were analyzed for the following contaminants: anions (chlorides,...

Reconstruction of thin films polyazomethine based on microscopic images

Publication

B. Hajduk

- Year 2011

Purpose: The aim of this paper was to investigate changes in surface morphology of thin films ofpolyazomethine PPI. Thin films were prepared using low-temperature chemical vapor deposition (CVD)method.Design/methodology/approach: The changes in surface topography was observed by the atomicforce microscope AFM and scanning electron microscope SEM. The results of roughness have beenprepared in the software WSxM NanoTec Spanish...

IR and microscopic studies of polyurethane surface in the polish extracorporeal ventricular assist device POLVAD-MEV

Publication

B. Hajduk

- Year 2014

Purpose: The aim of this article is to show results of IR measurements and microscopicanalysis performed on layers prepared with dissolved VAD fragments and pieces ofventricular assist devices cut out of from determined VAD sectors.Design/methodology/approach: The objects of the study have been POLVAD-MEVVADs from POLCAS system. Four ventricular assist devices POLVAD-MEV have beeninvestigated with use M80 SPECORD IR spectrophotometer...

Influence of LCVD technologicalparameters on propertiesof polyazomethine thin films

Publication

B. Hajduk

- Year 2009

Purpose: The aim of this paper is to show influence of technological parameters (temperature and gas streamintensity) of low-temperature chemical vapour deposition (LCVD) on optical properties and morphology ofpolyazomethine thin films.Design/methodology/approach: Thin layers of poly (1,4-phenylene-methylenenitrilo-1,4-phenylenenitrilo-methylene) (PPI) were prepared by low temperature LCVD method with use of argon as a transport...

Studying of spin-coated oxad-Si properties

Publication

B. Hajduk

- Year 2009

Purpose: The major aim of this paper was describing technical conditions of polymer thin film deposition byspin-coating techniques.Design/methodology/approach: Thin films of about nanometres thickness were prepared by spin-coatingand their properties were studied. As a material for preparing polymer thin films oxad-Si was used. The thinfilms were deposited with various spinning velocity from solution of different concentration....

Optical properties of polyazomethine with oxygen atom in the backbon

Publication

B. Hajduk

- Year 2008

Purpose: The aim of this paper is to show results of optical measurement performed on poly –(1-(4-methylenephenoxy-1)phenylene-4-methylene-1.4-phenylnenitrylomethylene) (PPI2) polyazomethine thinfilms and to compare with poly - (1.4-phenylenemethylenenitrilo-1.4 phenylenenitrilomethylene) (PPI).Design/methodology/approach: Influence of oxygen atom in the polymer chain on optical properties ofpolyazomethine was investigated....

Influence of Surface-Modified Montmorillonite Clays on the Properties of Elastomeric Thin Layer Nanocomposites

Publication

- Materials - Year 2023

In recent years, polyurethane nanocomposites have attracted more attention due to the massive demand for materials with increasingly exceptional mechanical, optical, electrical, and thermal properties. As nanofillers have a high surface area, the interaction between the nanofiller and the polymer matrix is an essential issue for these materials. The main aim of this study is to validate the impact of the montmorillonite nanofiller...

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Physical properties of polyazomethine thin films doped with iodine

Publication

B. Hajduk

- Journal of Achievements in Materials and Manufacturing Engineering - Year 2007

Purpose: The aim of this paper is to show influence of doping 1,4-phenylene-methylenenitrilo-1,4-phenylenenitrilomethylene (PPI) with iodine and to propose doping mechanism and its impact on electronicstructure of doped PPI thin films.Design/methodology/approach: Influence of iodine doping on electronic structure of polyazomethine thinfilms was investigated. Optical absorption spectra, XRD spectra and AFM images of doped PPI...

Influence of technological conditions on optical properties and morphology of spin-coated PPI thin films

Publication

B. Hajduk

- Year 2011

Purpose: The aim of this paper is to show technical and chemical parameters influence on opticalproperties and morphology of poly (1,4-phenylenemethylenenitrilo- 1,4-phenylenenitrilomethylene) (PPI)thin films prepared by spin-coating methodDesign/methodology/approach: PPI thin films were prepared by spin-coating method with variousspinning rates and molar concentrations. The monomers, terephthal aledehyde (TPA) and p-phenylenediamine(PPDA),...

Studying of polyoxadiazole with Si atom in the backbone

Publication

B. Hajduk

- Year 2010

Purpose: The aim of this paper is to show properties of spin-coated thin films of new polymer having siliconatom in the backbone. This amorphous polymer has appeared to be applied as active films in organic devices (asOLED).Design/methodology/approach: Thin films of 4-(diphenyl(4-(4-(5-(p-tolyoxy)phenyl)-1,3,4-oxadiazol-2-yl)phenyloamino)methyl)-phenyl)silyl)-1-methylbenzamide (Oxad–Si-B) were obtained by spin-coating method.The...

Comparing of optical properties and morphology of polyoxadiazoles with CF3 groups

Publication

B. Hajduk

- Year 2010

Purpose: The aim of this paper is to compare optical properties of 4-(1,1,1,3,3,3-hexafluoro-2(-4(-3(4-(5-(4-m-tolyoxy)phenyl)-1,3,4-oxadiazol-2-yl)phenoxy)phenylcarbomyl)phenyl)propan2-yl)-N-methylbenzamide(Oxad 6F-D) and 4-(1,1,1,3,3,3-hexafluoro-2(-4-(4-(4-(5-(4-(p-tolyoxy)phenyl)-1,3,4-oxadiazol-2-yl)phenoxycarbaomyl)phenyl)propan-2-yl)-N-methylbenzamide (Oxad 6F-E).Design/methodology/approach: The Oxad 6F polymer thin films...

Investigations of morphology and optical properties of thin films of TiOPc/PTCDA donor acceptor couple

Publication

B. Hajduk

- Journal of Achievements in Materials and Manufacturing Engineering - Year 2012

Purpose: The aim of this work is studying surface topography and optical properties of organic thin films ofTiOPc and PTCDA blends deposited by thermal vacuum evaporation.Design/methodology/approach: Thin films of blends of organic materials are provided as donor/acceptorcouples in bulk heterojunction based organic solar cells. Thin films of TiOPc - PTCDA mixture have beendeposited by thermal vacuum evaporation from one source...

Tailoring electronic structure of polyazomethines thin films

Publication

B. Hajduk

- Year 2010

Purpose: The aim of this work is to show how electronic properties of polyazomethine thin films deposited bychemical vapor deposition method (CVD) can be tailored by manipulating technological parameters of pristinefilms preparation as well as modifying them while the as-prepared films put into iodine atmosphere.Design/methodology/approach: The recent achievements in the field of designing and preparation methods tobe used while...

Study of Photovoltaic Devices with Hybrid Active Layer

Publication

B. Hajduk

- Solid State Phenomena - Year 2019

The aim of this work is to present the influences of composition of the material andmanufacturing technology conditions of the organic photovoltaics devices (OPv) with the organicand hybrid bulk heterojunction on the active layers properties and cells performance. The layers wereproduced by using small molecular compounds: the metal-phthalocyanine (MePc) and perylenederivatives (PTCDA) and the titanium dioxide (TiO2) nanoparticles....

Lipopolysaccharides: regulated biosynthesis and structural diversity

Publication

S. Raina

- INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES - Year 2023

The cell envelope of Gram-negative bacteria contains two distinct membranes, an inner (IM) and an outer (OM) membrane, separated by the periplasm, a hydrophilic compartment that includes a thin layer of peptidoglycan. The most distinguishing feature of such bacteria is the presence of an asymmetric OM with phospholipids located in the inner leaflet and lipopolysaccharides (LPSs) facing the outer leaflet. The maintenance of this...

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Escherichia coli K-12 suppressor-free mutants lacking early glycosyltransferases and late acyltransferases. Minimal lipopolysaccharide structure and induction of envelope stress response.

Publication

G. Klein-Raina
B. Lindner
W. Brabetz
H. Brade
S. Raina

- JOURNAL OF BIOLOGICAL CHEMISTRY - Year 2009

To elucidate the minimal lipopolysaccharide (LPS) structure needed for the viability of Escherichia coli, suppressor-free strains lacking either the 3-deoxy-d-manno-oct-2-ulosonic acid transferase waaA gene or derivatives of the heptosyltransferase I waaC deletion with lack of one or all late acyltransferases (lpxL/M/P) and/or various outer membrane biogenesis factors were constructed. Δ(waaC lpxL lpxM lpxP) and waaA mutants exhibited...

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The ChoCO-W prospective observational global study: Does COVID-19 increase gangrenous cholecystitis?

Publication

B. De
F. Abu-Zidan
E. Chouillard
S. Di
M. Sartelli
M. Podda
C. Gomes
E. Moore
S. Moug
L. Ansaloni... and 367 others

- World Journal of Emergency Surgery - Year 2022

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Simulating coherent light propagation in a random scattering materials using the perturbation expansion

Publication

- Year 2015

Multiple scattering of a coherent light plays important role in the optical metrology. Probably the most important phenomenon caused by multiple scattering are the speckle patterns present in every optical imaging method based on coherent or partially coherent light illumination. In many cases the speckle patterns are considered as an undesired noise. However, they were found useful in various subsurface imaging methods such as...

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Safety of Bariatric Surgery in ≥ 65-Year-Old Patients During the COVID-19 Pandemic

Publication

R. Singhal
I. Omar
Y. Rajeev
Y. Graham
A. Tahrani
C. Ludwig
K. Mahawar
M. Pędziwiatr
P. Major
P. Zarzycki... and 415 others

- OBESITY SURGERY - Year 2022

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30-Day Morbidity and Mortality of Bariatric Surgery During the COVID-19 Pandemic: a Multinational Cohort Study of 7704 Patients from 42 Countries

Publication

R. Singhal
C. Ludwig
G. Rudge
G. Gkoutos
A. Tahrani
K. Mahawar
M. Pędziwiatr
P. Major
P. Zarzycki
A. Pantelis... and 415 others

- OBESITY SURGERY - Year 2021

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Effect of BMI on safety of bariatric surgery during the COVID-19 pandemic, procedure choice, and safety protocols – An analysis from the GENEVA Study

Publication

R. Singhal
I. Omar
C. Ludwig
A. Tahrani
K. Mahawar
M. Pędziwiatr
P. Major
P. Zarzycki
A. Pantelis
D. Lapatsanis... and 413 others

- Obesity Research & Clinical Practice - Year 2022

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30-day morbidity and mortality of sleeve gastrectomy, Roux-en-Y gastric bypass and one anastomosis gastric bypass: a propensity score-matched analysis of the GENEVA data

Publication

R. Singhal
V. Cardoso
J. Super
C. Ludwig
G. Gkoutos
K. Mahawar
M. Pędziwiatr
P. Major
P. Zarzycki
A. Pantelis... and 415 others

- INTERNATIONAL JOURNAL OF OBESITY - Year 2022

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Surgeons’ practice and preferences for the anal fissure treatment: results from an international survey

Publication

A. Balla
F. Saraceno
M. Shalaby
G. Gallo
S. Di
P. De
R. Perinotti
P. Sileri
B. Aboulkacem
T. Abule... and 490 others

- Updates in Surgery - Year 2023

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Handling of the Covid-19 Pandemic and Its Effects on Bariatric Surgical Practice: Analysis of GENEVA Study Database

Publication

R. Singhal
S. Pouwels
Y. Rajeev
B. Madhok
W. Hanif
A. Tahrani
Y. Graham
C. Ludwig
K. Mahawar
M. Lamota... and 502 others

- OBESITY SURGERY - Year 2022

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System koherentnej tomografii optycznej czuły na stan polaryzacji

Publication

M. Maciejewski
J. Pluciński
B. Kosmowski

- Year 2006

W pracy przedstawiono konstrukcję systemu koherentnej tomografii optycznej umożliwiającego pomiar właściwości materiałów dwójłomnych. System pomiarowy wykorzystuje propagację wiązek promieniowania w wolnej przestrzeni. Promieniowanie prowadzone jest w układzie z zachowaniem stanu polaryzacji. Zastosowano detekcję zrównoważoną poprawiając właściwości pomiarowe systemu. Zostały przedstawione wstępne wyniki pomiarów.

Fiber - optic low-coherence tomography system for visualization of internal structure of ceramic materials

Publication

- Proceedings of SPIE - Year 2006

W artykule przedstawiono światłowodowy system dwuwymiarowej wizualizacji niejednorodnych struktur warstw ceramicznych. Omówiono projekt i fizyczną realizację układu wykorzystującego optyczną, niskokoherentną reflektometrię optyczną, która umożliwia niedestrukcyjne obrazowanie wewnętrznych struktur różnych materiałów. W pracy przedstawiono przykładowe wyniki pomiarów wewnętrznych warstw LSFO.

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Niskokoherentny, interferometryczny system do badaniawłaściwości materiałów ceramicznych

Publication

- Elektronika : konstrukcje, technologie, zastosowania - Year 2007

Przedstawiono światłowodowy system dwuwymiarowej wizualizacjiniejednorodnych struktur warstw ceramicznych. Omówiono projekti fizyczną realizację układu wykorzystującego optyczną, niskokoherentną reflektometrię optyczną, która umożliwia nieinwazyjne i bezkontaktowe obrazowanie wewnętrznych struktur różnych materiałówsilnie rozpraszających promieniowanie. Przedstawiono przykładowewyniki pomiarów wewnętrznych warstw ceramiki LSFO....

Wpływ charakterystyk szerokopasmowych źródeł wykorzystywanych w technice OLCR na jej właściwości metrologiczne

Publication

- Year 2005

W artykule przedstawiono zasady, na których oparta jest metoda OLCR, możliwości jej wykorzystania oraz wpływ czynników ograniczających jej zdolności pomiarowe. Zaprezentowano konstrukcję światłowodowego niskokoherencyjnego, reflektometrycznego systemu pomiarowego. Przedstawiono wyniki badań teoretycznych i doświadczalnych wpływu charakterystyk szerokopasmowych źródeł wykorzystywanych w systemie na rozdzielczość pomiaru.