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Tytuł:
Accelerometer - Based Measurements of Axial Tilt
Autorzy:
Łuczak, S.
Powiązania:
https://bibliotekanauki.pl/articles/384680.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
MEMS
accelerometer
tilt
measurements
Opis:
The paper deals with a specific type of tilt measurements, where an axial tilt is to be determined. The measurements are realized by means of accelerometers - MEMS devices most preferably. Various mathematical relations between the axial tilt and the Cartesian components of the gravitational acceleration are presented. Each relation is described in detail, especially in the terms of the resultant uncertainty of the measurement, as well as the requirements regarding the employed accelerometers. Results of experimental studies realized by means of commercial MEMS accelerometers are presented and discussed, especially with regard to the measurement accuracy that has been evaluated for each mathematical relation. Scope of application of each relation is proposed.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 1; 39-41
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced multi-engine platform (AMP™) – a way to robust RTK
Autorzy:
Averin, Sergey
Plenkin, Andrey
Ignatev, Pavel
Vorobiev, Michael
Veitsel, Andrey
Powiązania:
https://bibliotekanauki.pl/articles/320719.pdf
Data publikacji:
2019
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
RTK
heading
tilt
receiver frontend
receiver digital section
Opis:
The paper describes the Advanced Multi-Engine Platform (AMP™) – Topcon’s patent pending technique, which is capable to improve RTK performance, based on the idea of running several RTK engines in parallel. The performance of AMP™ is dependent on Topcon receiver board, where it has been implemented, and the best results are achieved with B210 board. The main specifics of B210 is that it has two RF front-ends and a single digital section. Such an architecture allows for calculating heading and tilt within a single receiver board, and providing better RTK performance due to synergy of attitude determination and RTK solutions from two antennas, calculated within a single digital section. The paper describes specifics of B210 board along with mathematical aspects of AMP™ and its logic. The test results demonstrate noticeable improvements in RTK performance for B210 receiver board with AMP™, compared with the classical single-engine RTK approach.
Źródło:
Annual of Navigation; 2019, 26; 12-20
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aktywna pionizacja pacjentów we wczesnej i rehabilitacji neurologicznej
Active tilting a patient to erect position within a very early period of neurorehabilitation
Autorzy:
Łukowicz, M.
Kuczma, W.
Hoffman, J.
Powiązania:
https://bibliotekanauki.pl/articles/261419.pdf
Data publikacji:
2008
Wydawca:
Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej
Tematy:
aktywny stół pionizacyjny
wczesna mobilizacja
terapia chodu
active tilt table
early mobilization
gait therapy
Opis:
WSTĘP. We wczesnym okresie rehabilitacji neurologicznej bardzo przydatny jest stół! do pionizacji pacjentów z możliwością dynamicznego obciążenia kończyn dolnych poprzez kroczenie (tzw. stepping). Oprócz zalet wynikających z pionizacji, stół umożliwia stymulację chodu, eliminuje zaburzenia krążeniowe podczas pierwszych prób pionizacji pacjentów długotrwale przebywających w pozycji leżącej. MATERIAŁ I METODA. Do badania włączono 16 pacjentów, bez zaburzeń rytmu i wahań ciśnienia na leżąco, w tym 8 pacjentów po urazie rdzenia kręgowego - w wieku od 19 do 36 lat i 8 pacjentów po urazie czaszkowo-mózgowym - w wieku od 14 do 59 łat. Porównano parametry krążeniowo-naczyniowe i oddechowe podczas 30-minutowej pionizacji na stole ERIGO - od fazy chodu w pozycji leżącej, poprzez włączenie kroczenia, chwilowe wyłączenie kroczenia, po powrót do chodu i powolne obniżanie stołu do pozycji leżącej. WYNIKI. Stwierdzono niewielkie wahania tętna podczas pionizacji, ze wzrostem w trakcie zatrzymania funkcji kroczenia i powrotem poziomu początkowego po jego uruchomieniu. W wartościach ciśnienia skurczowego oraz rozkurczowego krwi obserwowano niewielką tendencję do wzrostu wartości podczas zwiększania kąta pionizacji, następnie nagły spadek po zatrzymaniu funkcji kroczenia i ponowny powrót do poprzedniej wartości po uruchomieniu chodu. Liczba oddechów również nie ulegała zmianie podczas stopniowej pionizacji z funkcją kroczenia, natomiast po jej zatrzymaniu liczba oddechów gwałtownie rosła. WNIOSKI. Pionizacja na stole z funkcją kroczenia zapewnia stabilność parametrów krążeniowych oraz wspomaga usprawnianie pacjenta. Zatrzymanie kroczenia destabilizuje układ sercowo-naczyniowy. Może to być forma treningu układu sercowo-naczyniowego w późniejszych etapach rehabilitacji, natomiast we wczesnej fazie rehabilitacji neurologicznej pozwala na skuteczną i szybką pionizację, bez objawów niepożądanych.
INTRODUCTION. Tilting table can be an useful device in the very early period of neurorehabilitation. It allows to achieve tilting position with dynamic loading of lower extremities in a course of stepping process. Besides possibility of keeping the patient in erect position, tilting tables provide proper gate stimulation. MATERIAL AND METHOD. 16 patients without any circulatory disorders were enrolled in the test. 8 patients suffered from spinal cord injury (aged 19-36 years old) and 8 patients with brain injury (aged 14-59 years old). Circulatory and vascular parameters, as well as breath rate were measured during 30 minute training in the ERIGO table. Measurements were conducted during 5 phases of therapy, starting from the prone position, legs movement, standing position, movement termination, movement continuation and resting. RESULTS. During therapy by means of tilting table, changes in heart rate, blood pressure and breath rate were observed. When the table was elevated, a small increase of HR and blood pressure was measured. Wheras by eliminating the leg movements, the prompt drop of blood pressure and increase of HR were noticed. However, the restoration of movement, restored also previous parameters. Similar changes were observed in the breath rate. CONCLUSIONS. Tilting a patient on a tilting table with the "stepping function" leads to the stability of circulatory parameters. Stepping termination destabilizes the cardiovascular system. Thus, this therapy can be a form of cardiovascular training during the further stages of rehabilitation. In the early phase of treatment, allows for the effective and quick tilting without side effects.
Źródło:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2008, 14, 3; 213-216
1234-5563
Pojawia się w:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza podatności na złudzenia wzrokowe ze względu na zależność od pola i płeć
The analysis of susceptibility to visual illusions in the context of field dependence-independence and gender
Autorzy:
Bednarek, Hanna
Lukas, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/2014022.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
złudzenia kształtu i kierunku
teoria stałości przechylenia
FDI
Zӧllner i Poggendorff
iluzja Pręta i Ramy
shape and direction illusions
the Tilt-Constancy Theory
Zӧllner and Poggendorff
Rod and Frame illusion
Opis:
Poszukiwano odpowiedzi na pytania: czy osoby ulegające złudzeniom kształtu i kierunku ulegają także złudzeniom stałości przechylenia; czy osoby zależne w porównaniu z niezależnymi od pola w ujęciu Witkina charakteryzuje większa podatność na złudzenia; czy kobiety bardziej niż mężczyźni ulegają złudzeniom wzrokowym? Przeprowadzono dwa badania. W pierwszym wzięło udział 75 uczniów (M = 18,5; SD = 0,5), zaś w drugim 31 studentów psychologii (M = 20; SD = 0,5). Zastosowano Rod and Frame Test do badania iluzji Pręta i Ramy, komputerową symulację złudzeń wzrokowych: Zollnera, Poggendorffa, Ponzo, Ebbinghausa, Millera-Lyera oraz EFT Witkina do określania zależności od pola. Okazało się, że kobiety bardziej niż mężczyźni ulegają iluzji Pręta i Ramy, Poggendorffa i Zӧllnera, natomiast zależność od pola nie różnicuje podatności na badane złudzenia. Związki pomiędzy iluzją Pręta i Ramy a pozostałymi złudzeniami uzyskano dla kąta odchylenia ramy od pionu o 15 stopni.
The answers for three questions were sought: 1) whether people who are susceptible to shape and direction illusions are also most prone to illusions of constancy tilt; 2) whether field-dependent persons compared to field-independent are more susceptible to visual illusions; and 3) whether women are more prone to visual illusions than men. 75 high school students (M = 18.5; SD = 0.5) and 31 psychology students (M = 20; SD = 0.5) participated in the study. The Embedded Figures Test was used as a measure of field dependence-independence, Witkin’s Rod and Frame Test as a measure of the rod and frame illusion, whereas susceptibility to illusions (Zӧllner, Poggendorff, Ponzo, Ebbinghaus, Miller-Lyer) was verified with the use of computer tasks. It was revealed that field dependence/independence did not diversify the susceptibility to illusions mentioned above. The study showed differences in the susceptibility to illusions depending on gender. Women appeared to be more susceptible to Rod and Frame, Poggendorff and Zӧllner illusions than men. Correlations between Rod and Frames illusion and other illusions were obtained for the tilt angle of the frame from the vertical by 15 degrees.
Źródło:
Acta Universitatis Lodziensis. Folia Psychologica; 2015, 19; 43-61
2353-4842
Pojawia się w:
Acta Universitatis Lodziensis. Folia Psychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza zaopatrzenia w energię elektryczną budynku użyteczności publicznej z wykorzystaniem instalacji fotowoltaicznej i mikroturbiny
An analysis of the electricity supply at a public building utilizing photovoltaic systems and a microturbine
Autorzy:
Sawicka-Chudy, P.
Rybak-Wilusz, E.
Sibiński, M.
Cholewa, M.
Pawełek, R.
Powiązania:
https://bibliotekanauki.pl/articles/394965.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
instalacja fotowoltaiczna
system stacjonarny
system nadążny
mikroturbina gazowa
efektywność energetyczna
photovoltaic installation
tracking system
fixed-tilt panels
gas microturbine
energy efficiency
Opis:
W ostatnich latach poszukiwania nowych, efektywnych rozwiązań wytwarzania energii są skierowane na produkcję energii elektrycznej z wykorzystaniem nośników odnawialnych oraz przyjaznych środowisku. Spowodowało to wzrost zainteresowania ogniwami PV oraz systemami kogeneracyjnymi. W artykule, na tle historii rozwoju kolejnych generacji ogniw PV, zaprezentowano główne czynniki wpływające na ich parametry eksploatacyjne. Scharakteryzowano średnie dzienne promieniowanie słoneczne i prędkości wiatru w Łodzi. Przedmiotem badań była stacjonarna i nadążna instalacja fotowoltaiczna o łącznej mocy szczytowej 15 kWp oraz mikroturbina gazowa o mocy elektrycznej 30 kW, znajdujące się na Politechnice Łódzkiej na Wydziału Elektrotechniki, Elektroniki, Informatyki i Automatyki, zasilające sieć elektroenergetyczną budynków laboratoriów. Pomiary energetyczne prowadzono w 2016 roku i na ich podstawie wykonano analizę efektywności energetycznej i analizę finansową zaopatrzenia budynków w energię. Oceniono uzysk energii w modułach stacjonarnych i nadążnych oraz procentowe pokrycie energii elektrycznej z ogniw PV i mikroturbiny. Wyznaczono rozkład miesięcznych oszczędności, roczną oszczędność kosztów energii oraz czas zwrotu kosztów inwestycyjnych badanych systemów. Przeprowadzone badania pozwalają na stwierdzenie, że energia wytworzona przez moduły nadążne jest około 3 razy większa niż wytworzona w modułach stacjonarnych. Natomiast roczne oszczędności kosztów energii przy zastosowaniu mikroturbiny gazowej są około dziesięciokrotnie większe niż dla paneli nadążnych. Po przeprowadzeniu tej analizy można stwierdzić opłacalność stosowania agregatów kogeneracyjnych i paneli fotowoltaicznych, mimo dużych nakładów finansowych. Czas zwrotu nakładów inwestycyjnych wynosi około 12 lat podczas użytkowania instalacji przez cały rok.
Recently, the search for new effective energy production solutions has been focused on the production of electricity using renewable and environmentally friendly carriers. This resulted in an increased interest in PV cells and cogeneration systems. The article looks at the main factors affecting their operational parameters against the background of the development history of subsequent generations of PV cells. Average daily solar radiation and wind velocity in Lodz were characterized. The research was done on a static and tracking system with a total peak power of 15 kWp and a 30 kW microturbine. PV panels are installed on the building of the Institute of Electrical Power Engineering of the Lodz University of Technology and they work as part of DERLab. A microturbine is inside the building. Energy measurements were carried out in 2016 giving grounds for the analysis of energy efficiency and financial analysis of the energy supply in buildings. Energy yields in the static and tracking system as well as percentage coverage of electricity from PV cells and microturbines were assessed. The distribution of monthly savings, annual savings of energy costs and the payback time of the investment costs of the systems subject to the test were determined. The research we have done allows us to say that the energy produced by follow-up modules is about 3 times greater than that generated in stationary modules. On the other hand, the annual savings of energy costs using gas micro-turbines are about 10 times higher than those of lagging panels. The analysis shows that it is possible to determine the profitability of the microturbine and photovoltaic panels use despite large financial outlays. The payback period of investment outlays is about 12 years when using the installation throughout the year.
Źródło:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2018, 107; 47-59
2080-0819
Pojawia się w:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of heart rate variability during head-up tilt-test in patients with vasovagal syncope
Autorzy:
Budrejko, Szymon
Kempa, Maciej
Chmielecka, Monika
Kozłowski, Dariusz
Raczak, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/895735.pdf
Data publikacji:
2018-09-28
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
tilt table test
syncope
vasovagal syncope
heart rate variability
Opis:
Introduction: Syncope is defined as transient loss of consciousness, due to decrease in brain perfusion. The most frequent mechanism is vasovagal syncope. In many patients, the cause of syncope remains unspecified, despite an extensive diagnostic work-up. Tilt-test (TT) is an acknowledged diagnostic tool for syncope. Currently, the so-called Italian protocol of TT is most widely used. Vasovagal syncope is caused by impaired circulatory regulation in response to orthostatic stress. One of the available tools to examine the influence of the nervous system on the circulation is the analysis of heart rate variability (HRV). Despite numerous publications concerning HRV parameters and autonomic regulation in patients with syncope, direct comparisons and metaanalysis of the results is impossible, due to variability of TT protocols and study group specifications. Aim of the study: As there is no uniform model of HRV during TT, we aimed to analyze HRV parameters during TT (performed according to the Italian protocol) in patients with vasovagal syncope, in order to determine the possible application of HRV measurements in clinical practice in that group of patients. Detailed objectives were: (1) analysis and comparison of HRV in patients with and without the history of syncope; (2) analysis of HRV changes in consecutive stages of TT; (3) identification of possible HRV differences between patients with positive and negative TT results. Materials and methods: Patients between 18 and 50 years of age were qualified for the study, if they had a history of at least 2 incidents of syncope or presyncope within the preceeding 6 months, and if signs and symptoms indicated the vasovagal mechanism. The study group included 150 patients: 100 consecutive patients with a postive TT result (POS), and 50 consecutive patients with a negative TT result (NEG). The control group (CG) comprised 50 volunteers with no history of syncope nor presyncope, matched according to age and sex to the study group. In all patients a TT was performed according to the Italian protocol, with paced breathing at a rate of 15/min. Time-domain (meanRR, SDNN, RMSSD, pNN50) and frequency-domain (abs_LF, abs_HF, rel_LF, rel_HF, norm_LF, norm_HF, LF/HF) HRV parameters were analyzed and compared at different stages of TT in the study groups as specified above. Results: 100 patients at the age of 18-44 years were included in the POS group, 50 patients at the age of 18-39 years in the NEG group, and 50 volunteers at the age of 20-39 in the CG. Volunteers in the control group developed unexpectedly high percentage of positive TT (14 patients). For consistency of analysis, the CG was thus subdivided according to the result of the TT into CG_POS (positive result of TT) – 14 patients, and CG_NEG (negative result of TT) – 36 patients. Based on HRV analaysis, no significant differences in HRV values were noted between patients with a history of syncope and positive or negative result of TT. Upright tilt resulted in HRV changes of the same direction and value in syncopal patients in the POS and NEG goup, as well as in patients in the CG_NEG group. Conclusion: HRV values and changes of those values at subsequent stages of TT were not different between syncopal patients with postive or negative TT result, or negative TT control group. The Italian protocol of TT may be associated with a surprisingly high percentage of false positive results.
Źródło:
European Journal of Translational and Clinical Medicine; 2018, 1, 1; 26-38
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anterior approach for determination of sagittal spinopelvic parameters using anterior pelvic plane and sternum plane: a case study on symptom-free subjects
Autorzy:
Radło, Paweł
Danioł, Mateusz
Boehler, Lukas
Kozak, Josef
Powiązania:
https://bibliotekanauki.pl/articles/2063918.pdf
Data publikacji:
2020
Wydawca:
Międzynarodowe Stowarzyszenie na rzecz Robotyki Medycznej
Tematy:
USG nawigowane inteligentnie
przodopochylenie miednicy
staw biodrowy
zakres ruchu
chirurgia ortopedyczna wspomagana komputerowo
chirurgia robotyczna wspomagana komputerowo
smart navigated ultrasound
pelvic tilt in the anterior pelvic plane
hip-spine syndrome
range of motion
computer assisted orthopedic surgery
computer assisted robotic surgery
Opis:
Sagittal imbalance causes low back pain, hip impingement, and influences the whole skeleton and muscular system of our body. It is documented in the literature on spinal deformities that good long-term surgical results can only be achieved by restoring sagittal balance and spinopelvic harmony as part of surgical treatment. Currently, the state of the art in sagittal balance determination is based on conventional radiology or an EOS system both using X-ray radiation. These procedures are associated with radiation exposure for the patients. Therefore, a new anterior approach is shown in this work to measure sagittal balance with a navigated ultrasound system without any radiation exposure. The anterior pelvic plane and a newly defined sternum plane are considered to provide an assessment of the sagittal balance. This new approach was tested in a trial on 10 symptom-free subjects by using a smartphone navigated ultrasound system. The relationship between the rotation of the pelvis and the upper body inclination in young healthy people is examined in a standing position. The study with new determined landmarks (incisura jugularis, superior iliac spinas, and symphysis pubis) gives us significant different results between male and female test persons. A proposal for a classification of sagittal balance is achieved which defines a reasonable range for the Sternum Tilt of -0.1 ± 1.5° / 3.7 ± 2.5°. The significant advantage of this method is to evaluate the sagittal balance with a cost effective, smart system without any radiation exposure to the patient.
Źródło:
Medical Robotics Reports; 2020, 8/9; 20-26
2299-7407
Pojawia się w:
Medical Robotics Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania pozycjonowania paneli fotowoltaicznych na terytorium Polski
Research of the positioning of photovoltaic panels in Poland
Autorzy:
Baran, K.
Leśko, M.
Wachta, H.
Powiązania:
https://bibliotekanauki.pl/articles/156156.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
fotowoltaika
promieniowanie słoneczne
optymalny kąt pochylenia
system nadążny za Słońcem
photovoltaic
solar radiation
optimal tilt angle
solar-tracking system
Opis:
W artykule, metodą symulacyjną, wyznaczono najbardziej korzystny kąt pochylenia panelu fotowoltaicznego dla wybranych miejscowości w Polsce, a następnie zasymulowano jednoosiowy, nadążny system ruchu za Słońcem. Roczną energię, uzyskaną przy wykorzystaniu systemu nadążnego, porównano z energią, uzyskaną z panelu fotowoltaicznego, który był zamontowany w stałej pozycji nakierowania.
The paper presents the results of simulation research on the optimal tilt angle of photovoltaic panels in selected cities of Poland. The simulation was performed using the specialized computer software - Insel, which allowed simulating the work of the renewable energy sources. For the survey simulation there was selected a monocrystalline silicon photovoltaic panel of 185 W power and 14,49 % efficiency. The optimal tilt angle of panels, at which the biggest value of energy was obtained, based on the simulation, was respectively: 24° for Warsaw, 27° for Wroclaw, 30° for Gdansk and Poznan and 38° for Rzeszow. In the second part of the paper there is described the simulation of a single-axis solar-tracking system performed with use of a computer application. The simulation was made for the same cities of Poland, as that for the optimal value of the tilt angle of the photovoltaic module. The researched solar-tracking system tracked the movement of the Sun in the vertical axis, while in the horizontal axis there was set the permanent optimal value of the panel tilt, determined based on the simulation. The application of the mentioned solar-tracking system caused the growth of the obtained energy from 18% (Warsaw) to 26% (Gdansk), depending on the place of the panel location.
Źródło:
Pomiary Automatyka Kontrola; 2013, R. 59, nr 10, 10; 1097-1100
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correction of error in 3D reconstruction induced by CT gantry tilt
Autorzy:
Tomaka, A.
Trzeszkowska-Rotkegel, S.
Tarnawski, M.
Powiązania:
https://bibliotekanauki.pl/articles/333458.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
rekonstrukcja 3D z wycinku tomografii komputerowej
gantry tilt
3D reconstruction from CT slices
Opis:
The paper presents the problems connected with 3D reconstruction of CT slices of the database of orthodontic patients, using the commercial application software. Serious errors occurred for scans taken with a tilted CT gantry and inverse table movement. A compensation of the errors is proposed and the results after the compensation are verified by comparison to laser scans for a reference object, and to the measurements performed using the dedicated software of the CT station for selected cases in the database.
Źródło:
Journal of Medical Informatics & Technologies; 2008, 12; 169-175
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Data fusion in measurements of angular position
Autorzy:
Łuczak, S.
Powiązania:
https://bibliotekanauki.pl/articles/385274.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
data fusion
rotation-to-pulse angle sensor
tilt
Opis:
The paper describes a possibility of increasing accuracy of measurements of angular position with application of data fusion. Two cases of determining the angular position are considered: accelerometer-based measurements of tilt and measurements of angular position with application of incremental rotation-to-pulse sensor (coupled with an original measuring system described in the paper). Application of the proposed data fusion ensures in both cases decrease of the uncertainty of the related measurement of ca. 40%.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2010, 4, 2; 16-20
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation and damage to buildings caused by ground movements in mining areas (case study)
Autorzy:
Florkowska, Lucyna
Bryt-Nitarska, Izabela
Kruczkowski, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2073381.pdf
Data publikacji:
2021
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
building damage
mining areas
subsoil deformations
tilt measurement anthropocene
szkody budowlane
tereny górnicze
deformacje podłoża gruntowego
pomiary nachylenia antropocenu
Opis:
Human activity causes transformations in the near-surface layers of the rock mass, which result in long-term impacts on buildings and engineering infrastructure. Mining activities are particularly disadvantageous in this context, as they trigger severe deformation processes that reach the soil surface as a result of the excavation of deposits. The prevention of accidents and disasters caused by these impacts is based on knowledge derived from observation. Therefore, the aim of this study was to acquire and update knowledge on the impact of mining-related ground deformation and tremors on buildings. The paper presents the results of measurements carried out on a group of buildings located in an underground mining area. The buildings have been affected by mining impacts since their construction in the 1980s. Despite the implementation of appropriate structural protection, the structures have been suffering deformation and damage. For the purposes of the study, two two-axis inclinometers were installed on the 15.2 m high bell tower, taking measurements at 6-hour intervals. Over a period of 10 months, changes in the leaning of the tower were measured and the condition of the other buildings observed. The study resulted in obtaining: values for the change in tilt of the two perpendicular walls of the tower (over a period of 10 months),correlation of the results with tremors measurements and periodic surveying measurements of the inclination of the vertical edge of the tower, image of damage to buildings caused by mining deformation of the ground. On the basis of an analysis of the location and timing of minefields excavation, the occurrence of real ground movement in the mining areas, continuing even after the end of mining works, was confirmed and irregular deformation of the originally perpendicular walls of the masonry tower building was demonstrated. The tower did not behave as a rigid body; its horizontal profile was deformed.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2021, 4; 52--63
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dual-axis test rig for Mems tilt sensors
Autorzy:
Łuczak, S.
Powiązania:
https://bibliotekanauki.pl/articles/220491.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tilt sensor
accelerometer
MEMS
uncertainty of measurement
test rig
Opis:
The paper addresses the problem of experimental studies of miniature tilt sensors based on low-range accelerometers belonging to Microelectromechanical Systems (MEMS). A custom computer controlled test rig is proposed, whose kinematics allows an arbitrary tilt angle to be applied (i.e. its two components: pitch and roll over the full angular range). The related geometrical relationships are presented along with the respective uncertainties resulting from their application. Metrological features of the test rig are carefully evaluated and briefly discussed. Accuracy of the test rig is expressed in terms of the respective uncertainties, as recommended by ISO; its scope of application as well as the related limitations are indicated. Even though the test rig is mostly composed of standard devices, like rotation stages and incremental angle encoder, its performance can be compared with specialized certified machines that are very expensive. Exemplary results of experimental studies of MEMS accelerometers realized by means of the test rig are presented and briefly discussed. Few ways of improving performance of the test rig are proposed.
Źródło:
Metrology and Measurement Systems; 2014, 21, 2; 351-362
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of propiconazole (Tilt 250 EC) and Drechslera poae on germination capacity of Kentucky blue grass
Autorzy:
Czembor, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/2198997.pdf
Data publikacji:
2005-12-22
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
leaf spot and melting out
Poa pratensis L.
propiconazole (Tilt 250 EC)
seed germination
Opis:
The effect of leaf spot and melting out disease and chemical control on seed quality of Kentucky bluegrass was investigated over two seasons in three treatments: natural infection, inoculation by Drechslera poae and Tilt 250 EC (propiconazole) application. Disease incidence in the treatment with natural infection was low and in the treatment with inoculation was much heavier. Application of propiconazole and occurrence of leaf spot and melting out disease not affected germination capacity of Kentucky bluegrass. Future experiments are needed to confirm obtained results.
Źródło:
Plant Breeding and Seed Science; 2005, 52; 29-34
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gender differences in circulatory adjustment to head-up tilt test in health
Autorzy:
Rimi, S.A.
Rezwana, I.
Sultana, S.
Ferdousi, S.
Powiązania:
https://bibliotekanauki.pl/articles/2087921.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
male
female
tilt test
SBP
DBP
Opis:
Background: A tilt table test is a useful, non-invasive technique that has been used for the last few decades to detect autonomic failure. The response to tilting may vary physiologically between sexes. Aim of the study: To assess the gender-specific changes in cardiovascular response to a tilt test in healthy subjects. Material and methods: This experimental study was conducted on 90 healthy males and females aged 18–60 years, from 2019 to 2020. Forty-five male subjects and 45 female subjects were included. Using a motorized tilt table, a tilt table test was performed at 60 degrees for 10 minutes. An automatic sphygmomanometer was used to measure blood pressure (BP), and heart rate (HR) and a pulse oximeter was used for the measurement of peripheral capillary oxygen saturation (SpO₂). An independent sample t test, a multiple regression analysis and a chi squared test were conducted for statistical analyses. Results: A significantly greater drop in systolic blood pressure (SBP) was observed in females, compared to males after tilting. In 5.5% of the subjects, orthostatic intolerance occurred, but there were no significant age or gender- specific differences in subjects with orthostatic intolerance. Conclusions: This study concluded that in response to tilting, cardiovascular response was less pronounced in females.
Źródło:
Medical Science Pulse; 2020, 14, 2; 10-14
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geophysical assessment for gold mineralization potential over the southern part of Kebbi State using aeromagnetic data
Autorzy:
Augie, Abdulrahaman Idris
Salako, Kazeem Adeyinka
Rafiu, Adewuyi Abdulwaheed
Jimoh, Mufutau Owolabi
Powiązania:
https://bibliotekanauki.pl/articles/2124698.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
gold mineralization
Yauri-Zuru schist belt
Centre for Exploration Targeting (CET)
first vertical derivatives (FVD)
second vertical derivatives (SVD)
source parameter imaging (SPI)
tilt derivative (TDR)
Opis:
The magnetic signatures over the southern part of Kebbi State and its environs were analyzed together with the geological settings of the area to delineate the structures that may host gold mineralization. The aeromagnetic data used was the survey carried out by Fugro airborne surveys between 2005 and 2010 on behalf of the Federal Government of Nigeria. The reduction to equator (RTE), first and second vertical derivatives (FVD and SVD), Centre for Exploration Targeting (CET), analytic signal (AS), source parameter imaging (SPI) and tilt derivative (TDR) techniques were applied to the magnetic data covering the area. The results of the AS technique revealed that the study area is characterized with high amplitudes of magnetic anomalies (above 0.048 nT/m) and these could be of ferromagnetic minerals such as gold. The FVD, SVD, CET and TDR techniques also helped in delineating the lineaments (such as faults, fractures or shears zones) believed to be associated with alteration zones which play an important role in determining gold mineralized zones. The direction of the orientation of these features/lineaments trended in the NE-SW direction. The faults, fractures or shears zones delineated represent veins of possible mineralization. The depth of occurrence to the causative bodies using SPI algorithms was found to be below 137 m. Structures delineated within the area, when compared with the geological setting of the area, correspond to: quartz-mica schist, granite, biotite, gneiss, diorite, medium coarse-grained and biotite hornblende granite. Results from these techniques revealed alteration zones that may host gold. These regions correspond to the following areas: SE parts of Yauri and Shanga, Fakai, Ngaski, Zuru, Magama, Rijau, and the eastern part of Wasagu/Danko and Bukkuyum.
Źródło:
Geology, Geophysics and Environment; 2022, 48, 2; 177--193
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
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