Autor: Kozłowski, D. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Distribution of myocardial bridges in domestic pig
Autorzy:: Kosinski, A.
Grzybiak, M.
Kozlowski, D.
Powiązania:: https://bibliotekanauki.pl/articles/32013.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: distribution
myocardial bridge
domestic pig
pig
heart
ischaemia
morphology
coronary artery
Opis:: Localisation and morphology of myocardial bridges in the heart of domestic pig remain an open issue. Since these structures significantly influence haemodynamics in the coronary arteries, their occurance may lead to numerous pathologies. In the examined group of 150 domestic pig’s hearts, myocardial bridges were diagnosed in 47.3% of the material, mostly in males. In majority of cases the bridges were present above the posterior interventricular branch of the right coronary artery, less often above the anterior interventricular branch of the left coronary artery, and seldom above other blood vessels. The presence of myocardial bridges usually referred to the medial and initial segments of the arteries examined.
Źródło:: Polish Journal of Veterinary Sciences; 2010, 13, 4
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Myocardial bridges in domestic pig - morphological aspects
Autorzy:: Kosinski, A.
Grzybiak, M.
Piwko, G.
Kozlowski, D.
Powiązania:: https://bibliotekanauki.pl/articles/31254.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:: The morphology of myocardial bridges (MB) in the heart of the domestic pig remain an open issue. Despite numerous analyses of the subject, many controversies still exist. Opinions also differ when the influence of the MB on haemodynamic processes in the coronal vessel system is concerned. In the examined group of 150 domestic pig's hearts, the length of the detected MB varied from 1.8 to 39.7 mm while their thickness amounted to 0.8 - 4.7 mm. Both the longest and the thickest bridges were connected with the posterior interventricular branch. It was noticed that the MB muscle bands cross the long axis of the vessels located in the grooves mostly at almost a right angle. Three forms of perivascular space were educed using the criterion of the distance of the vessel from the surrounding muscularis externa.
Źródło:: Polish Journal of Veterinary Sciences; 2011, 14, 3
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Modeling and Control of a 4-wheel Skid-steering Mobile Robot
Autorzy:: Kozłowski, K.
Pazderski, D.
Powiązania:: https://bibliotekanauki.pl/articles/907961.pdf
Data publikacji:: 2004
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: robot mobilny
backstepping
analiza Lyapunova
mobile robots
skid-steering vehicles
time-varying control laws
Lyapunov analysis
Opis:: A mathematical model of a 4-wheel skid-steering mobile robot is presented in a systematic way. The robot is considered as a subsystem consisting of kinematic, dynamic and drive levels. Next, a designing process of a kinematic controller based on the algorithm introduced by (Dixon et al., 2001) is shown. An extension of the kinematic control law at the dynamic and motor levels using the Lyapunov analysis and the backstepping technique is developed. To validate the designed algorithm, extensive simulation results for trajectory tracking and set-point cases are discussed. Some deliberations concerning the tuning of the controller are presented, too.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2004, 14, 4; 477-496
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Road project assessment within the framework of sustainable development
Autorzy:: Kozłowski, W.
Gołębiewski, D.
Powiązania:: https://bibliotekanauki.pl/articles/96475.pdf
Data publikacji:: 2017
Wydawca:: Fundacja Ekonomistów Środowiska i Zasobów Naturalnych
Tematy:: inwestycja drogowa
ocena
road infrastructure investment
assessment
Opis:: Local development is a dynamic process which mainly relies on qualitative and quantitative changes, accordingly to the needs of the local communities. One of the decisive circumstances of local development is an efficient road infrastructure. The main problem, in terms of road projects, is their socio-economic evaluation. The article presents a model for assessing S16 national road construction project, on the basis of four groups of indicators. The indicators monitor the changes occurring in the districts, located along the road corridor S16, within the framework of sustainable development. Results of the research give opportunity to a more detailed analysis and evaluation of road projects, furthermore they make a strong foundation for the exploration of cause-and-effect relations between the investments in infrastructure and the quality of life in the region.
Źródło:: Ekonomia i Środowisko; 2017, 1; 181-196
0867-8898
Pojawia się w:: Ekonomia i Środowisko
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Control of a planar robot in the flight phase using transverse function approach
Autorzy:: Pazderski, D.
Kozłowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/201212.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: transverse functions
hopping robot
space manipulator
nonholonomic system
control motion task
systems on Lie groups
skaczący robot
manipulator przestrzenny
nieholonomiczny układ
Opis:: This paper deals with stabilization and tracking control problems defined with respect to a planar mechanical structure similar to Raibert’s robot. The proposed control solution is based on formal analysis of the control system on a Lie group. In order to take advantage of Lie group theory a dynamic extension of the robot kinematics is introduced. To cope with non-zero angular momentum the controller based on transverse functions is employed. Properties of the closed-loop control system are investigated based on simulations including practical stabilization at neighborhood of a constant point or a reference trajectory.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 759-770
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Control of a unicycle-like robot with trailers using transverse function approach
Autorzy:: Pazderski, D.
Kozłowski, K.
Waśkowicz, D.
Powiązania:: https://bibliotekanauki.pl/articles/201599.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: transverse functions
vehicle with trailers
nonholonomic system
control motion task
Lie group
Opis:: The paper presents the application of a smooth kinematic algorithm to control multi-body vehicle which consists of the unicyclelike tractor with three trailers. The controller takes advantage of the transverse functions and properties of the IV-order two input chained system. The derivation of the algorithm is presented in details. In order to improve the performance of the controller in the real application a selected tuning techniques are discussed. The properties of the closed-loop control system are examined based on results of numerical simulations concerning the point stabilization and trajectory tracking tasks.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 557-579
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Modelling and experimental research of nonholonomic ball gear
Autorzy:: Krysiak, B.
Pazderski, D.
Kozłowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/384790.pdf
Data publikacji:: 2011
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: nonholonomic constraint
nonholonomic manipulator
kinematics and dynamics
Opis:: The paper considers kinematic and dynamic model of ball gear which can be used in a nonholonomic manipulator. The phase constraints are described and constrained forces and torques are discussed. In order to describe mechanical properties of the gear experimental research were conducted. Based on experimental results maximum driving torque, gear efficiency and resultant slip are estimated.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2011, 5, 3; 27-32
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Real-time obstacle avoidance using harmonic potential functions
Autorzy:: Szulczyński, P.
Pazderski, D.
Kozłowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/384802.pdf
Data publikacji:: 2011
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: motion planning
obstacle avoidance
mobile robot
harmonic function
Opis:: The paper presents a solution of motion planning and control of mobile robot in a two-dimensional environment with elliptical static obstacle based on hydrodynamics description. Theoretical background refers to solution of Laplace equation using complex algebra. The method of designing complex potential with respect to stationary elliptical obstacle and stationary goal is formally shown. Next, the planning motion problem is extended assuming that the goal is moving. Then results of motion planning is used in order to design closed-loop control algorithms which is based on decoupling technique. Theoretical considerations are supported by numerical simulations illustrating example results of motion planning and control.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2011, 5, 3; 59-66
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Closed-loop control algorithm for some class of nonholonomic systems using polar representation
Autorzy:: Pazderski, D.
Szulczyński, P.
Kozłowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/201607.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: polar coordinates
nonholonomic system
discontinuous stabilization at the origin
Opis:: This paper is focused on the convergence problem defined for some class of a two input affine nonholonomic driftless system with three-dimensional state. The problem is solved based on a polar transformation which is singular at the origin. The convergence is ensured using static-state feedback. The necessary conditions for construction of the algorithm are formally discussed. The solution, in general, is local, and the feasible domain is strictly related to the properties of the control system. In order to improve algorithm robustness a simple hybrid algorithm is formulated. The general theory is illustrated by two particular systems and the results of numerical simulations are provided.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 521-535
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Vision localization system for mobile robot with velocities and acceleration estimator
Autorzy:: Dutkiewicz, P.
Kielczewski, M.
Kozłowski, K.
Pazderski, D.
Powiązania:: https://bibliotekanauki.pl/articles/199936.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: vision localization system
mobile robot
acceleration estimator
Opis:: The paper presents a localization system for a mobile robot using the vision system and LED markers and considers the problem of velocity and acceleration estimation in the case of planar motions. Theoretical considerations include the principle of measurement and the details of Kalman estimator with illustrations based on experimental setup. The presented measurement system can be used for a realization of advanced control algorithms for skid-steering mobile robots where significant slippage phenomenon appears.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 1; 29-41
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Evaluation of Exposure to Impulse Noise at Personnel Occupied Areas During Military Field Exercises
Autorzy:: Młyński, R.
Kozłowski, E.
Usowski, J.
Jurkiewicz, D.
Powiązania:: https://bibliotekanauki.pl/articles/177458.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: impulse noise
noise exposure
hearing damage risk criteria
weapon
Opis:: The tests reported in this paper were carried out to evaluate the exposure of soldiers to noise at operator and control positions during military field exercises. The tests were conducted during firing from a T-72 tank, a BWP-1 Infantry Fighting Vehicle, antitank guided missiles, a ZU-23-2K anti-aircraft gun, and a 2S1 GOZDZIK howitzer. The evaluation of noise exposure showed that the limit values of sound pressure level, referred to by both Polish occupational noise protection standards and the Pfander and Dancer hearing damage risk criteria developed for military applications, were repeatedly exceeded at the tested positions. Despite of the use of tank crew headgear, the exposure limit values of sound pressure level were exceeded for the crew members of the T-72 tank, the BWP-1 infantry fighting vehicle, and the 2S1 GOZDZIK howitzer. The results show that exposure of soldiers to noise during military field exercises is a potentially high hearing risk factor.
Źródło:: Archives of Acoustics; 2018, 43, 2; 197-205
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Confocal techniques for surface profile measurements - methodology and instrumentation
Metoda i urządzenie do pomiaru kształtu powierzchni z wykorzystaniem technik konfokalnych
Autorzy:: Galas, J.
Litwin, D.
Kozłowski, T.
Sitarek, S.
Błocki, N.
Powiązania:: https://bibliotekanauki.pl/articles/256729.pdf
Data publikacji:: 2006
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:: profilowanie powierzchni
sensor konfokalny
surface profiling
confocal sensor
Opis:: A surface profile measurement system for scanning the area of 100 mm x 100 mm with the lateral accuracy of 0.1 žm and height accuracy of 50 nm is presented. A confocal element has been used as a measurement head. This paper describes the methodology and the instrumentation including the calibration procedure and a discussion of accuracy.
Opracowany i wykonany został system do pomiaru kształtu powierzchni umożliwiający skaning powierzchni w płaszczyźnie XY w zakresie 100x100 mm z dokładnością 0.1 žm oraz pomiar współrzędnej Z w zakresie 0-100 mm z dokładnością 50 nm. Jako element pomiarowy współrzędnej Z zastosowano sensor konfokalny. W artykule opisano zasadę pomiaru, opisano system pomiarowy, metody kalibracji oraz uzyskane dokładności.
Źródło:: Problemy Eksploatacji; 2006, 4; 105-113
1232-9312
Pojawia się w:: Problemy Eksploatacji
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Extrusion pretreatment of maize straw - case study for a Polish biogas plants
Autorzy:: Kozłowski, K.
Lewicki, A.
Czekała, W.
Wójtowicz, A.
Kupryaniuk, K.
Dróżdż, D.
Powiązania:: https://bibliotekanauki.pl/articles/2082645.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: maize straw
extrusion
methane fermentation
biogas
energetic potential
Opis:: One of the most commonly used substrates in biogas plants is maize silage, however, the application of monofermentation technology under Polish economic conditions has a tendency to rapidly bankrupt the investor. The lack of profitability of investments based on this material has encouraged investors to search for other, more economically favourable biomass sources i.e. maize straw. The aim of the research was to compare the energetic potential of untreated maize straw and extruded maize straw used for biogas production and furthermore, to determine the amount of electricity and heat generated as well as the amount of heat produced from direct combustion. The results obtained confirmed the substantial energy potential of maize straw. It has been proven that using the extrusion method as a pretreatment before the fermentation process, enables the producer to increase biogas and methane production respectively by 7.50 and 8.51%. However, the use of an extruder machine in biogas plants in Poland is economically unjustified due to its high energy consumption. Moreover, it has been shown, that the use of maize straw in the methane fermentation process enables it to generate (in Poland) a higher income than is the case of using this material in a direct combustion process.
Źródło:: International Agrophysics; 2019, 33, 4; 527-535
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Influence of maize straw content with sewage sludge on composting process
Wpływ zawartości słomy kukurydzianej oraz osadów ściekowych na proces kompostowania
Autorzy:: Czekała, W.
Dach, J.
Janczak, D.
Smurzyńska, A.
Kwiatkowska, A.
Kozłowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/293260.pdf
Data publikacji:: 2016
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: composting process
maize straw
sewage sludge
waste management
gospodarka odpadami
osady ściekowe
proces kompostowania
słoma kukurydziana
Opis:: After entrance to EU in 2004, the management of sewage sludge has become more and more important problem for the new members. In Poland, one of the most promising technologies is composting process of sewage sludge with carbonaceous materials. However, the high price of typically used cereal straw forces the specialists to look for new and cheap materials used as donor of carbon and substrates creating good, porous structure of composted heap. This work presents the results of sewage sludge composting mixed with sawdust and maize straw used to create structure favorable for air exchange. The results show dynamic thermophilic phase of composting process in all cases where maize straw was used.
Po przystąpieniu Polski do Unii Europejskiej w 2004 r. gospodarka osadami ściekowymi stała się dla nowych państw istotnym problemem. W Polsce jedną z najbardziej obiecujących technologii jest kompostowanie osadów ściekowych wraz z substratami bogatymi w węgiel. Jednakże wysoka cena słomy zbożowej stwarza konieczność poszukiwania tanich materiałów bogatych w węgiel i poprawiających porowatość kompostowanej pryzmy. W pracy zaprezentowano wyniki badań nad kompostowaniem osadów ściekowych z dodatkiem trocin oraz słomy kukurydzianej, używanej jako substrat umożliwiający lepszy przepływ powietrza. Doświadczenie zostało przeprowadzone w bioreaktorach do modelowania procesu kompostowania będących na wyposażeniu Instytutu Inżynierii Biosystemów. Wyniki dowiodły, że wystąpiła dynamicznie faza termofilna w każdej z prób, w której używano słomy kukurydzianej.
Źródło:: Journal of Water and Land Development; 2016, 30; 43-49
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Poznań Air Pollution Analysis for 2015–2017
Autorzy:: Smurzyńska, A.
Czekała, W.
Hektus, P.
Marks, S.
Mazurkiewicz, J.
Brzoski, M.
Chełkowski, D.
Kozłowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/125027.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: Poznań
air pollution
PM10
PM2.5
Opis:: Air pollution is the result of natural processes and intense urban development. The undesired emission of volatile substances causes environmental threats such as acid rains, aggravated greenhouse effect or the ozone depletion. Moreover, the pollution released into the air is harmful to the human respiratory system, eyes and skin. This paper presents the body of analyses conducted in Poznań between 2015–2017 on the changes in the local emission concentration of PM10 and PM2.5. The data concerning the emission of suspended particulates were provided by the meteorological station on Polanka St. in Poznań. The research included a correlation analysis. The results point to a steady decrease in the amount of produced particulates. It was also noted that the emissions of PM10 and PM2.5 change seasonally, with the highest levels in the autumn and winter. Furthermore, the amount of emitted suspended particulates is correlated with the temperature; hence, it is supposed that the main source of air pollution in Poznań involves low-efficiency heaters and boilers.
Źródło:: Journal of Ecological Engineering; 2018, 19, 6; 162-169
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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