Applied sciences

Bulletin of the Polish Academy of Sciences: Technical Sciences

Content

Bulletin of the Polish Academy of Sciences: Technical Sciences | 2005 | vol. 53 | No 3 |

Abstract

The analysis of mechanical behaviour of spinal column is until now still a challenge, in spite of the great amount of research which has been conducted over the last years. It is a particularly complex structure considering number of components, their shapes and mechanical characteristics. The objectives of the presented investigations are to understand the mechanisms of the mechanical behaviour of the spine structure and the role of its components, as well as the factors of its dysfunctions as scoliosis discopathy, spondylolisthesis. Also some mechanical effects of surgical interventions by total disc replacement is considered. To account for the 3D character of the spine system including vertebrae, discs, ligaments, muscles etc. the finite element method (FEM) formulation was used throughout the paper. Some specific features of the structure are included in the models as non-conservative loads and muscular tension control performed by the nervous system. The finite element method together with CAD programs and experimental validation was used in investigations of a new type of artificial disc for lumbar spine. The stress analyses were performed for the prostheses being in clinical use and for some original new designs. The conclusions concern most important determinants of the mechanical behaviour of the system and the quality of the intervertebral disc prosthesis.

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Abstract

In this simulation study, we used an anatomical computer model of the human ventricles to simulate body surface potentials and magnetic field for 10 single preexcitation sites and 8 pairs of preexcitation sites positioned on the epicardial surface along the atrio-ventricular ring. We demonstrated that electrocardiographic and magnetocardiographic inverse solutions using a pair of equivalent dipoles could be employed in localising dual accessory pathways. Average localisation errors were in the range of 5 to 21 mm and 3 mm to 20 mm, respectively, when body surface potentials and magnetic field were used. Additionally, we have investigated the influence of random lead displacements and limited lead selection on localisation results.

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Abstract

High resolution body surface potential maps and an equivalent current dipole model of the cardiac generator were used to assess the heart state in two abnormal conditions: WPW syndrome with single accessory pathway and local ventricular ischemia. Results of a simulation study and experimental verification of the method for both cardiologic abnormalities are presented. Single accessory pathway in WPW syndrome was simulated as initial ventricular activation at the atrio-ventricular ring. Using a current dipole model of the cardiac generator, the locus of arrhythmogenic tissue was assessed with a mean error of 11 mm. Experimental localization of the accessory pathway in a WPW patient was in good agreement with the invasively obtained site. Local repolarization changes were simulated as shortening of the myocytes action potentials in three regions typical for stenosis of main coronary arteries. Using surface QRST integral maps and dipolar source model, small subendocardial and subepicardial lesions of myocardium were inversely located with a mean error of 9 mm and larger transmural lesions with a considerable mean error of 17 mm. Extent and prevalence of subepicardial or subendocardial type of the lesion were reflected in the dipole moment and orientation. In experimental verification of the method, in 7 of 8 patients that underwent PCI of a single vessel, estimated equivalent current dipole position matched well the treated vessel. The results suggest that diagnostic interpretation of body surface potential maps based on dipolar source model could be a useful tool to assess local pathological changes in the heart.

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Abstract

The propagation of EEG activity during the Continuous Attention Test (CAT) was determined by means of Short-time Directed Transfer Function (SDTF). SDTF supplied the information on the direction, spectral content and time evolution of the propagating EEG activity. The differences in propagation for target and non-target conditions were found mainly in the frontal structures of the brain.

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Abstract

Purpose: to demonstrate the possibility of finding features reliable for more precise distinguishing between normal and abnormal Pattern Electroretinogram (PERG) recordings, in Continuous Wavelet Transform (CWT) coefficients domain. To determine characteristic features of the PERG and Pattern Visual Evoked Potential (PVEP) waveforms important in the task of precise classification and assessment of these recordings. Material and methods: 60 normal PERG waveforms and 60 PVEPs as well as 47 PERGs and 27 PVEPs obtained in some retinal and optic nerve diseases were studied in the two age groups (<= 50 years, > 50 years). All these signals were recorded in accordance with the guidelines of ISCEV in the Laboratory of Electrophysiology of the Retina and Visual Pathway and Static Perimetry, at the Department and Clinic of Ophthalmology of the Pomeranian Medical University. Continuous Wavelet Transform (CWT) was used for the time-frequency analysis and modelling of the PERG signal. Discriminant analysis and logistic regression were performed in statistical analysis of the PERG and PVEP signals. Obtained mathematical models were optimized using Fisher F(n1; n2) test. For preliminary evaluation of the obtained classification methods and algorithms in clinical practice, 22 PERGs and 55 PVEPs were chosen with respect to especially difficult discrimination problems (“borderline” recordings).

Results: comparison between the method using CWT and standard time-domain based analysis showed that determining the maxima and minima of the PERG waves was achieved with better accuracy. This improvement was especially evident in waveforms with unclear peaks as well as in noisy signals. Predictive, quantitative models for PERGs and PVEPs binary classification were obtained based on characteristic features of the waveform morphology. Simple calculations algorithms for clinical applications were elaborated. They proved effective in distinguishing between normal and abnormal recordings.

Conclusions: CWT based method is efficient in more precise assessment of the latencies of the PERG waveforms, improving separation between normal and abnormal waveforms. Filtering of the PERG signal may be optimized based on the results of the CWT analysis. Classification of the PERG and PVEP waveforms based on statistical methods is useful in preliminary interpretation of the recordings as well as in supporting more accurate assessment of clinical data.

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Abstract

The electrical impedance diagnostic methods and instrumentation developed at the Gdansk and Warsaw Universities of Technology are described. On the basis of knowledge of their features, several original approaches to the broad field of electrical impedance applications are discussed. Analysis of electrical field distribution after external excitation, including electrode impedance, is of primary importance for measurement accuracy and determining the properties of the structures tested.

Firstly, the problem of electrical tissue properties is discussed. Particular cells are specified for in vitro and in vivo measurements and for impedance spectrometry. Of especial importance are the findings concerning the electrical properties of breast cancer, muscle anisotropy and the properties of heart tissue and flowing blood. The applications are both important and wide-ranging but, for the present, special attention has been focused on the evaluation of cardiosurgical interventions.

Secondly, methods of instrument construction are presented which use an electrical change in conductance, such as impedance pletysmography and cardiography, for the examination of total systemic blood flow. A new method for the study of right pulmonary artery blood flow is also introduced. The basic applications cover examination of the mechanical activity of the heart and evaluation of many haemodynamic parameters related to this. Understanding the features that occur during blood flow is of major importance for the proper interpretation of measurement data.

Thirdly, the development of electrical impedance tomography (EIT) is traced for the purposes of determining the internal structure of organs within the broad field of 2-D and 3-D analysis and including modelling of the organs being tested, the development of reconstruction algorithms and the construction of hardware.

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Abstract

Biosensors are a crucial part of most of bioanalytical diagnostic devices and systems. Due to semiconductor technologies, a great progress in diminution of costs and miniaturisation as well as an increased reliability of these devices was achieved. Application of

molecular and biological techniques in the detection process has contributed to a real increase in sensitivity, selectivity, the detection limit and the number of analytes to be detected. Different transducers of chemical parameters into electrical output signals are applied in these devices. Electrochemical principles, both potentiometric and amperometric, are opted for due to their simplicity of application and extremely low costs of such biosensors. Ion sensitive field effect transistors (ISFETs) may be easily integrated into the required electronics, resulting in their miniaturisation. Further miniaturisation may be attained by development of miniaturised total analytical systems (uTAS). To ensure competitive parameters of these biosensors, optimal methods of immobilisation of biochemical receptors (ionophores, enzymes, antibodies, etc.) should be developed. A review of the work by the authors related to these problems is presented in the article.

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Abstract

Sol-gel derived silica possess many promising features, including low-temperature preparation procedure, porosity, chemical and physical stability. Applications exploiting porous materials to encapsulate sensor molecules, enzymes and many other compounds, are developing rapidly. In this paper some potential applications, with emphasis on biomedical and environmental ones, are reviewed. The material preparation procedure is described and practical remarks on silica-based sol-gels are included. It is reported that sol-gels with entrapped various molecules may be used in construction of implants and coatings with bioactive properties. It is shown how to exploit the sol-gel production route for construction of sol-gel coated fiberoptic applicators for lasertherapy. The applications of bioactive materials are discussed, as well. It is demonstrated that it is possible to immobilize photosensitive compounds in sol-gel matrix without loosing their photoactivity. Some examples of sol-gel based biosensors are demonstrated, as well, showing their potential for detecting various gases, toxic substances, acidity, humidity, enzymes and biologically active agents.

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Abstract

Despite the considerable progress that has recently been made in medicine, the treatment of viral infections is still a problem remaining to be solved. This especially concerns infections caused by newly emerging patogenes such as: human immunodeficiency virus, hepatitis C virus or SARS-coronavirus. There are several lines of evidence that the unusual genetic polymorphism of these viruses is responsible for the observed therapeutic difficulties. In order to determine whether some parameters describing a very complex and variable viral population can be used as prognostic factors during antiviral treatment computational methods were applied. To this end, the structure of the viral population and virus evolution in the organisms of two patients suffering from chronic hepatitis C were analyzed. Here we demonstrated that phylogenetic trees and Hamming distances best reflect the differences between virus populations present in the organisms of patients who responded positively and negatively to the applied therapy. Interestingly, the obtained results suggest that based on the elaborated method of virus population analysis one can predict the final outcome of the treatment even before it has started.

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Abstract

Optimization of dialysis needs methods for quantitative assessment of fluid and solutes transport in body compartments and solute

and fluid exchange between body and dialysate. A mathematical model describing the dynamics of these quantities during dialysis is presented. This model is first and foremost based on the existing models, but also includes some new solutions. All parts were combined and extended by the detailed descriptions of selected aspects. The “virtual patient” model was applied to simulate and test different methods of treatment and their influence on the condition of the patient. The purpose of this model is to serve as a decision support system for selection of “optimal” treatment options for particular patient.

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Abstract

The positive (minimal) realization problem for a class of singular discrete-time linear single-input, single-output systems with delays in state and delays in control is addressed. Solvability conditions for the positive (minimal) realization problem are established. It is shown that there exists a positive (minimal) realization of an improper transfer function T(z) = n(z) / d(z) if the coefficients of polynomial n(z) are non-negative and of the polynomial d(z) are non-positive except the leading one, which should be positive. A procedure for computation of the positive (minimal) realization of the transfer function is proposed and illustrated by an example.

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Editorial office

Editor-in-Chief:

T. Kaczorek, Warsaw University of Technology

Deputy Editor-in Chief:

M. Kaźmierkowski, Warsaw University of Technology

A. Rogalski, Division IV Technical Sciences PAN

Board of Co-editors:

Artificial and Computational Intelligence

S. Osowski and B. Sawicki, Warsaw University of Technology

Biomedical Engineering and Biotechnology

A. Liebert and R. Maniewski, Institute of Biocybernetics and Biomedical Engineering PAN

Civil Engineering

L. Czarnecki, Building Research Institute, ITB, Warsaw

Control, Robotics and Informatics

J. Klamka and A. Babiarz, Silesian Technical University

A. Borkowski, Institute of Fundamental Technological Research PAN

Electronics, Telecommunication and Optoelectronics

M. Mrozowski and A. Lamęcki, Gdansk University of Technology

W. Woliński, Warsaw University of Technology

Mechanical and Aeronautical Engineering, Thermodynamics

A. Styczek and A. Tylikowski, Warsaw University of Technology

Materials Science and Nanotechnology

B. Major and P. Czaja, Institute of Metallurgy and Materials Science PAN

T.A. Kowalewski and B. Blachowski, Institute of Fundamental Technological Research PAN

Power Systems and Power Electronics

M.P. Kazmierkowski, Warsaw University of Technology

International Editorial Advisory Board

I.V. Alexandrov, Ufa State Aviation Technical University, Russia

R. Asthana, University of Wiscontin-Stout, Menomonie, USA

Xu Binshi, China Association of Plant Engineering, Beijing, P.R. China

F. Blaabjerg, Aalborg University, Denmark

C. Cecati, University of L’Aquila, Italy

A. Cichocki, RIKEN Institute, Tokyo, Japan

M. David, National Polytechnique de Toulouse, France

R. Ebner, Materials Centre Leoben, Leoben, Austria

E. Fornasini, University of Padova, Padova, Italy

L.G. Franquelo, University of Sevilla, Spain

M. Gad-el-Hak, Virginia Commonwealth University, Richmond, USA

D. van Gemert, Catholic University Leuven, KU Leuven, Belgium

L. Keviczky, Hungarian Academy of Sciences, Budapest, Hungary

V. Kučera, Czech Technical University in Prague, Prague, Czech Republic

R. Kennel, Technical University Munich, Germany

E. Levi, Liverpool John Moore University, UK

G. Maier, Technical University of Milan, Milan, Italy

K.F. Man, City University of Hong Kong,

H.A. Mang, Austrian Academy of Sciences, Vienna, Austria

H. Mihashi, Tohoku University, Aoba-ku, Sendai, Japan

S. Mindess, University of British Columbia, Vancouver, Canada

D.A. Mlynski, University of Karlsruhe, Karlsruhe, Germany

A.S. Nowak, University of Michigan, Ann Arbor, USA

K. Ohnishi, Keio University, Yokohama, Japan

A. Öberg, Linköping University, Linköping, Sweden

W. Pedrycz, University of Alberta, Canada

S. Przemieniecki, University of South Florida, Tampa, USA

M. Razeghi, Northwestern University, Evanston, USA

J. Rodriguez, Technical University of Federico Santa Maria, Valparaiso, Chile

J.V. Sloten, Catholic University Leuven, Leuven, Belgium

B.M. Wilamowski, University of Auburn, Alabama, USA

W. Włosiński, Warsaw University of Technology, Warsaw, Poland

A.L. Yarin, Institute of Illinois at Chicago, USA

Du Xiangwan, Chinese Academy of Engineering, China

J. Żurada, Department of Computer Engineering, University of Louisville, USA

Contact

Editorial Office:

Pałac Kultury i Nauki

Wydział IV Nauk Technicznych PAN

Pl. Defilad 1

PL 00-901 Warszawa

Mrs Ewa Trojanowska

bulletinpas.et@gmail.com

Instructions for authors

Instructions for Authors

About the Journal

The Bulletin of the Polish Academy of Sciences: Technical Sciences (Bull. Pol. Ac.: Tech.) is published by the Division IV: Engineering Sciences of the Polish Academy of Sciences. The journal is peer‐reviewed and is published both in printed and electronic form (http://www.czasopisma.pan.pl/bpas). It is established for the publication of original high quality papers from multidisciplinary Engineering sciences with the following topics preferred:

• Artificial and Computational Intelligence,

• Biomedical Engineering and Biotechnology,

• Civil Engineering,

• Control, Informatics and Robotics,

• Electronics, Telecommunication and Optoelectronics,

• Mechanical and Aeronautical Engineering, Thermodynamics,

• Material Science and Nanotechnology,

• Power Systems and Power Electronics.

General data:

Format of the journal – A4 printed and electronic form,

Paper type – offset

Colourfulness – full colour at an extra charge,

The volume of the journal – 200 pages (ca 20 papers) + 4 cover pages,

Frequency of publication – bimonthly,

ISSN: 0239-7528 (print version),

ISSN: 2300-1917 (on line version),

DOI: 10.2478/bpasts

Abbreviations/Acronym:

Journal citation: Bull. Pol. Ac.: Tech.

ISO: Bull. Pol. Acad. Sci.-Tech. Sci.,

JCR Abbrev: B POL ACAD SCI-TECH

Acronym in the Editorial System: BPASTS

Journal Metrics:

JCR Impact Factor 2017: 1.361

5 Year Impact Factor 2017: 1.323

SCImago Journal Rank (SJR) 2015: 0.526

Source Normalized Impact per Paper (SNIP) 2015: 1.208

Impact per Publication (IPP) 2015: 1.158

The Polish Ministry of Science and Higher Education 2017: 25 points

Manuscript types:

Invited reviews presenting the state of the knowledge and/or devoted to novel topics,

• Refereed research papers reporting on original scientific or technological achievements,

• Refereed papers in special issues/sections serving as conference proceedings arranged by guest editors.

Special Section Policy

Proposals of original Special Sections within the scope of the Journal may be submitted to the Editorial Office. Special Section submission rules are described in detail at: Edytorial Systems

Guest Editor form needed for submitting a Special Section proposal: Edytorial systems

Manuscript Submission Policy

All manuscripts submitted for publication should be original. Manuscripts published or under consideration for publication elsewhere should not be submitted and will not be considered. Submission of a paper implies that it has not been published previously, that it is not under consideration for publication elsewhere, and that if accepted it will not be published elsewhere in the same form, in English or in any other language, without the written consent of the Publisher.

However, manuscripts based on papers published at related conferences and workshops proceedings may be submitted for consideration provided that: (1) the papers are not identical (similarity index must be below 50%), (2) the authors cite their earlier conference paper on which this new work is based, (3) the journal publication includes clearly shown novel elements (e.g., more comprehensive experiments).

Manuscript submission for review

The Bull. Pol. Ac.: Tech now employs a Web-based manuscript submission and peer-review tracking system called Editorial System. Authors must submit their manuscript electronically on the web: http://www.editorialsystem.com/bpasts/.

From this entry page, access can be obtained to all information required for the submission of a manuscript. First‐time users must create an Author’s account to obtain a user ID and password required to enter the system. All manuscripts receive individual identification codes that should be used in any correspondence with regard to the publication process. For the authors already registered in the Editorial System it is enough to enter their username and password to login as an author (Sign in).

Author(s) will be notified about registration and manuscript review process by e-mail.

The manuscripts must be uploaded as a single PDF file.

If you experience difficulties with the manuscript submission website, please contact the Copy Editor of the Bull. Pol. Ac.: Tech (Anna Jurkiewicz: bulletinPAS@gmail.com).Names of authors and their affiliation should be removed from the manuscripts for the review process in order to have a fair evaluation of their manuscript. All authors of the manuscript are responsible for its content; they must have agreed to its publication and have given the corresponding author the authority to act on their behalf in all matters pertaining to publication. The Corresponding Author is responsible for informing the coauthors of the manuscript status throughout the submission, review, and production process. All submitted papers are checked using iThenticate plagiarism detection software.

Manuscript preparation

1. The manuscript should be written in clear and concise English.

2. For manuscript preparation please use the attached Word or LaTeX template.

3. Please remember that in the .pdf version of the manuscript for evaluation process author(s) name(s) and affiliation should be removed.

4. Authors should consult a recent issue of the journal for style if possible.

Manuscript decision and Proofs

Manuscript evaluations are assigned one of four outcomes: Accept, Minor Revisions, Major Revisions, and Reject. Manuscripts with "Minor Revision" do not require a second review. All manuscripts receiving a "Major Revision" evaluation must be subjected to a second review. Rejected manuscripts are given no further consideration. Normally, manuscripts that receive a "Major Revision" decision have only one additional chance for revision and the revised version should be uploaded to the Editorial System within six weeks. If the author(s) failed to make satisfactory changes, the manuscript is rejected. On acceptance, manuscripts are subject to editorial amendment to suit house style.

Transfer of Copyright Agreement

Once the paper is initially accepted, the authors are assumed to have transferred the copyright of the paper to the publisher. Please fill the attached Form, sign, and add to the final version of the manuscript as separate .pdf file.

It is also available on the webpage

https://www.editorialsystem.com/files/bpasts/docs/BPASTS_License_to_publish.pdf.

Proofs will be sent to the author (first named author if no corresponding author is identified for multi-authored papers) and should be returned within 48 hours of receipt.

Fees for printing the article

The Bulletin of the Polish Academy of Sciences: Technical Sciences (Bull. Pol. Ac.: Tech.) is published in Open Access, which means that all papers are available on the internet to all users immediately upon publication free of charge for the readers. By submitting a paper for publication, authors declare that they are ready to cover the costs of printing their paper. In exchange for a fee for printing, the PDF file of published paper is available at the Open Access platform: http://www.degruyter.com/view/j/bpasts

National (foreign) authors:

• The flat fee of 1230 PLN (approximately 300 EUR) per paper

Exempt from the fee are:

• Authors of articles ordered by the Editorial Board (Invited papers)

50% discount for:

• Reviewers (who performed at least 5 reviews per year) – one paper per year

• Guest Editors (the discount is valid only within the special section guest-edited by the author)

Mandatory over-length charges of 200 PLN (approximately 50 EUR) per page

in case the paper exceeds

• 8 printed double-column pages for regular research papers,

• 8 printed double-column pages for Special issue/section papers,

• No limit for invited (review) papers.

In addition, each color page will be charged an additional fee according to the current cost of printing. Otherwise, the paper will be printed in black-white.

Information needed for Proforma Invoice

1. Author’s/Authors’ Last name(s), Name(s), e-mail

2. Title of the paper

3. Exact name of the payer (person / institution or other legal entity realizing the transfer)

4. Address of the payer

5. Taxpayer Identification Number (TIN, in Polish NIP) – only when paid by an institution or another legal entity!

Check list for final submission to the Bull. Pol. Ac.: Tech (after review)

1. Is your manuscript up to date? Did you include references, which were published while your manuscript was being processed? It is expected that at least 20% of references are to journal papers published in the last two years. Authors are welcome to consider reference papers published in the Bull. Pol. Ac.: Tech. In order to find the recent Bull. Pol. Ac.: Tech. papers please visit Open Access platform: http://www.czasopisma.pan.pl/dlibra/journal/95347

2. Is your title adequate and is your abstract correctly written? In the age of electronic publications it is not easy to be noticed! Authors have to do everything possible so the paper will be seen and read. Therefore, very careful wording should be used in the title and in the abstract. Without a proper and interesting title and abstract a great paper might never be downloaded from the de Gruyter platform http://www.czasopisma.pan.pl/dlibra/journal/95347 and read.

3. Does the manuscript clearly describe problem(s) and your accomplishments? Can your manuscript be shortened? Are there sentences or paragraphs that do not provide important information and can be eliminated?

4. Is the length of your manuscript adequate? Please notice that for long papers, you may face mandatory over length charges per page.

5. Please make sure that the fee for printing your manuscript is paid.

Open Access policy

Bulletin of the Polish Academy of Sciences: Technical Sciences jest czasopismem wydawanym w wolnym dostępie na licencji CC BY-NC-ND 4.0.

Bulletin of the Polish Academy of Sciences: Technical Sciences is an open access journal with all content available with no charge in full text version. The journal content is available under the licencse CC BY-NC-ND 4.0.

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