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Tytuł:
Positive solutions to a third order nonlocal boundary value problem with a parameter
Autorzy:
Szajnowska, Gabriela
Zima, Mirosława
Powiązania:
https://bibliotekanauki.pl/articles/29519483.pdf
Data publikacji:
2024
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
boundary value problem
nonlocal boundary conditions
positive solution
cone
Opis:
We present some sufficient conditions for the existence of positive solutions to a third order differential equation subject to nonlocal boundary conditions. Our approach is based on the Krasnosel’skiĭ-Guo fixed point theorem in cones and the properties of the Green’s function corresponding to the BVP under study. The main results are illustrated by suitable examples.
Źródło:
Opuscula Mathematica; 2024, 44, 2; 267-283
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Experiments of A New Internal Cone Type Traveling Wave Ultrasonic Motor
Autorzy:
Chen, Ye
Yang, Junlin
Li, Liang
Xiao, Shihao
Powiązania:
https://bibliotekanauki.pl/articles/31339802.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
ultrasonic motors
traveling wave
internal cone type
bending vibration
Opis:
In order to simplify the motor structure, to reduce the difficulty of rotor pre-pressure application and to obtain better output performance, a new internal cone type rotating traveling wave ultrasonic motor is proposed. The parametric model of the internal cone type ultrasonic motor was established by the ANSYS finite element software. The ultrasonic motor consists of an internal cone type vibrator and a tapered rotor. The dynamic analysis of the motor vibrator is carried out, and two in-plane third-order bending modes with the same frequency and orthogonality are selected as the working modes. The other advantages of this motor are that pre-pressure can be imposed by the weight of the rotor. The prototype was trial-manufactured and experimentally tested for its vibration characteristics and output performance. When the excitation frequency is 22260.0 Hz, the pre-pressure is 0.1 N and the peak-to-peak excitation voltage is 300 V, the maximum output torque of the prototype is 1.06 N · mm, and the maximum no-load speed can reach 441.2 rpm. The optimal pre-pressure force under different loads is studied, and the influence of the pre-pressure force on the mechanical properties of the ultrasonic motor is analyzed. It is instructive in the practical application of this ultrasonic motor.
Źródło:
Archives of Acoustics; 2023, 48, 3; 373-380
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the exact daily gas intake according to the level of formation completion in the underground gas storage
Określenie dokładnego dziennego poboru gazu w zależności od stopnia udostępnienia formacji w podziemnym magazynie gazu
Autorzy:
Akhundova, Nargiz R.
Aliyeva, Ofeliya
Powiązania:
https://bibliotekanauki.pl/articles/31348306.pdf
Data publikacji:
2023
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
underground gas storage (UGS)
reservoir penetration degree
gas dynamic imperfections
flat-bottomed well
investment
cone bit
flat-radial flow
hemispherical-radial flow
curvilinear-radial flow
podziemny magazyn gazu (PMG)
stopień udostępnienia złoża
imperfekcje dynamiczne gazu
otwór płaskodenny
nakłady
świder gryzowy
przepływ płasko-radialny
przepływ hemisferyczno-radialny
zakrzywiony przepływ radialny
Opis:
This article derives the formula for the exact daily gas intake of a gas-dynamic incomplete flatbed gas injection well according to the level of formation completion in the underground gas storage (UGS). In natural gas fields and underground gas storages, the formation is incompletely saturated with hydrocarbons due to the level of completion of the formation. In the upper part of the formation there is a flat-radial simple leakage flow through the gas well, and in the unopened part there is a complex curved radial flow. Separate formulas have been developed for the exact daily volume consumption of hydrocarbon gas injected into these wells. For this purpose, gas dynamics problems for two different stationary gas flows have been solved. By adding up the daily volume of gas consumption according to these formulas, the formula of full daily consumption for replaced well No. 2 was obtained. Which is equal to the exact full daily volume consumption of flatbed well No. 1. Fluids and gases are known to enrich the water supply and field system. The boundaries of the latter are the contours of the pressure and the flow. The water pressure in the reservoir was determined by changing the sum of the volume of the cavity at the edge of the reservoir, the capacity of the created gas and the amount of injected gas.
W artykule wyprowadzony został wzór na dokładny dzienny pobór gazu z odwiertu gazowo-energetycznego z niepełnym zasilaniem gazem, w zależności od stopnia udostępnienia formacji w podziemnym magazynie gazu (PMG). W przypadku złóż gazu ziemnego i podziemnych magazynów gazu formacja jest nie w pełni nasycona węglowodorami z uwagi na poziom jej wypełnienia. W górnej części formacji występuje prosty przepływ płasko-radialny przez odwiert gazowy, a w części nieudostępnionej przepływ jest znacznie bardziej skomplikowany i ma charakter zakrzywionego przepływu radialnego. Opracowano oddzielne równania dla dokładnego dziennego zużycia objętości gazu węglowodorowego zatłaczanego do tych odwiertów. W tym celu wykorzystano zagadnienia dynamiki gazu dla dwóch różnych stacjonarnych przepływów gazu. Po zsumowaniu dziennego zużycia gazu zgodnie z tymi wzorami otrzymano formułę pełnego dziennego zużycia dla wymienionego odwiertu nr 2. Jest ono równe dokładnemu dziennemu zużyciu gazu przez dany odwiert płaskodenny nr 1. Jak wiadomo, płyny i gazy wzbogacają układ zasilania wodą i system terenowy. Granicami tych ostatnich są kontury ciśnienia i przepływu. Ciśnienie wody w zbiorniku zostało określone poprzez zmianę sumy objętości ubytku w brzeżnej części zbiornika, objętości wprowadzonego gazu i ilości wtłoczonego gazu.
Źródło:
Nafta-Gaz; 2023, 79, 9; 592-595
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of age by mental foramen using CBCT in central India
Autorzy:
Bose, Sourav
Sur, Jaideep
Khan, Fatima
Dewangan, Deeplaxmi
Paul, Sushmita
Sawriya, Ekta
Roul, Ayesha
Powiązania:
https://bibliotekanauki.pl/articles/27317669.pdf
Data publikacji:
2023-09-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
cone-beam computed tomography
forensic science
mental foramina
Opis:
Introduction and aim. This study aims to estimate the age of a population in Central India by analyzing the mental foramen using cone beam computed tomography (CBCT). The objectives of the study are to determine the parameters for age determination and study bilateral variations in mental foramen dimensions using CBCT. Material and methods. One hundred and twenty CBCT scans, HD LED monitor, GALAXIS GALLIEOS viewer. Results. Results from the study show significant values for various parameters such as the upper and lower borders of the mandible and mental foramen. Bilateral variations were also observed. The age regression model indicates a significant correlation between estimated and original ages for individuals aged between 31 to 50 years. While the study only analyzed five parameters of the mental foramen, it suggests that a more comprehensive assessment of mental foramen parameters with a larger sample size can yield more definitive results for age determination. Conclusion. As only five parameters of mental foramen had been assessed in this retrospective study, so a comprehensive assessment of various other parameters of mental foramen with an increased sample size may be done for more definitive results for gender and age determination.
Źródło:
European Journal of Clinical and Experimental Medicine; 2023, 3; 500-505
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Life cycle assessment of glass/polyester laminates used in the shipbuilding industry and its fire behavior
Ocena cyklu życia laminatów szklano-poliestrowych stosowanych w przemyśle stoczniowym i ich reakcji na ogień
Autorzy:
Dowbysz, Adriana
Kukfisz, Bożena
Samsonowicz, Mariola
Markowska, Dorota
Jankowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/24201152.pdf
Data publikacji:
2023
Wydawca:
Fundacja Ekonomistów Środowiska i Zasobów Naturalnych
Tematy:
glass-polyester laminate
life cycle assessment
cone calorimeter
Fire Test Procedures Code
laminat poliestrowo-szklany
ocena cyklu życia
kalorymetr stożkowy
międzynarodowy kodeks stosowania procedur prób ogniowych
Opis:
The aim of this study is to assess the environmental performance of the manufacturing process of glass/polyester laminates as well as estimate their fire behaviour and smoke release. The Life Cycle Assessment was conducted according to the ISO14040/44 standard by using the CML-IA 2000 Baseline Midpoint method. The cone calorimeter study was conducted using a cone calorimeter method according to ISO 5660. The tests were performed under 25 kW/m2 heat flux 50 kW/m2. The results showed that according to the requirements of the Fire Test Procedure (FTP) Code examined, laminates in this form cannot be used in some applications. The LCA study showed that the highest impact is attributed to marine aquatic ecotoxicity (88.3%), with the highest contribution of the unsaturated polyester resin and the glass fibre.
Celem pracy jest ocena wpływu procesu produkcji laminatów poliestrowo-szklanych na środowisko oraz ocena ich zachowania w warunkach pożaru. Ocenę cyklu życia przeprowadzono zgodnie z normą ISO14040/44, stosując metodę CML-IA 2000 Baseline. Badania kalorymetryczne przeprowadzono metodą kalorymetru stożkowego zgodnie z normą ISO 5660. Badania przeprowadzono przy gęstościach strumienia promieniowania cieplnego równych 25 kW/m2 i 50 kW/m2. Wyniki wykazały, że zgodnie z wymaganiami międzynarodowego kodeksu stosowania procedur prób ogniowych badane laminaty w tej postaci nie spełniają wymagań dotyczących niektórych zastosowań. Ocena cyklu życia wykazała, że proces produkcji laminatów oddziałuje w największym stopniu na toksyczność wody morskiej (88.3%), przy największym udziale nienasyconej żywicy poliestrowej i włókna szklanego.
Źródło:
Ekonomia i Środowisko; 2023, 2; 236--254
0867-8898
Pojawia się w:
Ekonomia i Środowisko
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Network optimality conditions
Autorzy:
Osmolovskii, Nikolai P.
Qian, Meizhi
Sokołowski, Jan
Powiązania:
https://bibliotekanauki.pl/articles/31343935.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
network
optimal control problem
weak local minimum
Pontryagin’s maximum principle
critical cone
quadratic form
second order optimality conditions
Riccati equation
Opis:
Optimality conditions for optimal control problems arising in network modeling are discussed. We confine ourselves to the steady state network models. Therefore, we consider only control systems described by ordinary differential equations. First, we derive optimality conditions for the nonlinear problem for a single beam. These conditions are formulated in terms of the local Pontryagin maximum principle and the matrix Riccati equation. Then, the optimality conditions for the control problem for networks posed on an arbitrary planar graph are discussed. This problem has a set of independent variables xi varying within their intervals [0, li], associated with the corresponding beams at network edges. The lengths li of intervals are not specified and must be determined. So, the optimization problem is non-standard, it is a combination of control and design of networks. However, using a linear change of the independent variables, it can be reduced to a standard one, and we show this. Two simple numerical examples for the single-beam problem are considered.
Źródło:
Control and Cybernetics; 2023, 52, 2; 129-180
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study of MHD Williamson-nano fluid flow past a vertical cone in the presence of suction/injection and convective boundary conditions
Autorzy:
Sathyanarayana, Manthri
Goud, Tamtam Ramakrishna
Powiązania:
https://bibliotekanauki.pl/articles/27312230.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Williamson fluid
nanofluid
vertical cone
suction/Injection
convective
boundary condition
Opis:
The primary objective is to perform a numerical synthesis of a Williamson fluid that has nanoparticles added to it and is directed toward a vertical cone in a uniform transverse magnetic field, under heat and mass transport, suction and injection, and convective boundary conditions. For this particular fluid flow, by utilising similarity transformations, the partial differential equations are transformed into ordinary differential equations. Calculating these kinds of equations with their suitable bounds requires the Runge–Kutta technique in combining a shooting strategy. The functions of a vast number of parameters are graphically represented and assessed on flow field profiles. The results show the local skin friction, local Nusselt number, and local Sherwood number and the changing values of the flow constraints. Finally, the results are compared to those from the previously published works and found to be in good agreement.
Źródło:
Archives of Thermodynamics; 2023, 44, 2; 115--138
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radial solutions for nonlinear elliptic equation with nonlinear nonlocal boundary conditions
Autorzy:
Kossowski, Igor
Powiązania:
https://bibliotekanauki.pl/articles/29519502.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
nonlocal boundary value problem
radial solution
elliptic equation
Krasnoselskii's fixed point theorem in cone
Opis:
In this article, we prove existence of radial solutions for a nonlinear elliptic equation with nonlinear nonlocal boundary conditions. Our method is based on some fixed point theorem in a cone.
Źródło:
Opuscula Mathematica; 2023, 43, 5; 675-687
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Roadmap for daily practice of CBCT in cleft lip palate paediatric patients: a pictorial review.
Autorzy:
Olszewski, Raphael
De Muylder, Antoine
Siciliano, Sergio
Powiązania:
https://bibliotekanauki.pl/articles/48519884.pdf
Data publikacji:
2023
Wydawca:
Presses Universitaires de Louvain
Tematy:
cone beam computed tomography
CBCT
cleft lip palate
paediatric
reporting
Opis:
Objective: to present and to illustrate a new methodology for daily practice in cone beam computed tomography (CBCT) interpretation and reporting in cleft lip palate (CLP) non syndromic paediatric patients. The proposed protocol is based on clinical experience and on systematic search of the literature. Material and methods: We performed two types of systematic search of articles: 1) articles related to the use of CBCT in CLP patients, and 2) articles related to the reporting and interpretation of the CBCT images by radiologists. We used two databases PubMed and Google scholar. Results: For indications of CBCT in CLP patients we found in PubMed 378 articles and 48 articles were selected for the review; in Google scholar we found 463 articles, and 9 articles were selected for the review. 2) For reporting in CBCT we found 956 articles in PubMed, and 9 articles were selected for the review. Conclusions: We presented the 6-steps system for interpretation and reporting information from CBCT of CLP paediatric patients: 1) Step 1 (axial view): presence or absence of bone bridge remnants of alveolar bone graft; Step 2 (3D dental tissue reconstruction): description of dental arch tooth by tooth, search for agenesis and supernumerary teeth, description of variation in the position of the tooth explaining the type of existing translation and rotation; Step 3 (coronal view): cleft palate pathway and its extension; anomaly in maxillary, ethmoid and sphenoid sinuses if existing; Step 4 (sagittal and coronal view): checking of the opening (calcification sites) of the sphenooccipital synchondrosis, and checking of anomalies of the occipital bone; Step 5 (3D bone tissue reconstruction): C1-C2 vertebra anomalies; Step 6 (3D soft tissue reconstruction): external ear anomalies. We illustrated our methodology with 46 figures from 5 CBCT of CLP patients.
Źródło:
Nemesis. Negative Effects in Medical Sciences Oral and Maxillofacial Surgery; 2023, 30, 1; 1-50
2593-3604
Pojawia się w:
Nemesis. Negative Effects in Medical Sciences Oral and Maxillofacial Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Second-order optimality conditions in nonsmooth vector optimization
Autorzy:
Yadav, Priyanka
Powiązania:
https://bibliotekanauki.pl/articles/31342762.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
vector optimization
cones
nonsmooth second-order cone-convexity
second-order optimality
duality
Opis:
In this paper, we introduce new classes of nonsmooth second-order cone-convex functions and respective generalizations in terms of first and second-order directional derivative. These classes encapsulate several already existing classes of cone-convex functions and their weaker variants. Second-order KKT type sufficient optimality conditions and duality results for a nonsmooth vector optimization problem are proved using these functions. The results have been supported by examples.
Źródło:
Control and Cybernetics; 2023, 52, 1; 35-51
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Taurodontic teeth in cone beam computed tomography: pictorial review
Autorzy:
Fourneau, Eléonore
Olszewski, Raphael
Powiązania:
https://bibliotekanauki.pl/articles/48518226.pdf
Data publikacji:
2023
Wydawca:
Presses Universitaires de Louvain
Tematy:
taurodontism
CBCT
cone beam computed tomography
taurodontic teeth
Opis:
Objective: Taurodontism is a developmental disorder with enlargement of the body of the tooth and lack of cervical constriction, which results in a large pulp chamber and small roots with the apical displacement of furcation. Taurodontism exists in deciduous, and definitive unilateral, and bilateral teeth. We found that taurodontism was also described in 67 syndromes. We proposed a review of the open access literature on taurodontism, a new clinical classification of taurodontic teeth with illustrations from free open access literature, and from our case serie of 15 patients. Material and methods: We performed a systematic search for articles with free full text about taurodontism. The search was performed by one observer in PubMed database. We found 168 articles, and after application of inclusion/exclusion criteria we finally selected 136 articles for the review. Results: we provided 34 figures of taurodontic teeth related to: 1) Unilateral mandibular first premolar, 2) Unilateral mandibular second premolar, 3) Bilateral mandibular first and second premolar, 4) Bilateral upper maxillary first premolars, 5) Bilateral mandibular second molars, 6) Bilateral upper maxillary second premolar and left first molar, 7) Bilateral upper maxillary third molars, 8) Bilateral upper maxillary first and second molars, 9) Bilateral upper maxillary first, second, and third molars, 10) Bilateral upper maxillary molars (third molars, second, and first left upper molars), and mandibular molars (first right, and left mandibular molars, right third molar), 11) Bilateral upper maxillary molars (first, second, third right, and left upper molars), and mandibular molars, 12) Unilateral first mandibular premolar with cleft, 13) Bilateral molars of the mandible and the upper maxilla (adolescent patient who received chemotherapy at the age of 3-years-old to treat retinoblastoma), 14) Unilateral first maxillary molar (Treacher-Collins syndrome). Conclusions: We proposed a new clinical classification of taurodontic teeth based on hypo-, meso-, and hypertaurodontism, and on different types of deciduous, and definitive teeth (42 boxes). We were first to provide free reference images for: 1) upper maxillary second premolar hypertaurodontism, 2) mandibular second premolar mesotaurodontism, 3) upper maxillary third molar meso-and hypertaurodontism, 4) mandibular first molar hypotaurodontism, 5) mandibular third molar mesotaurodontism. We were also first to freely illustrate taurodontism related with chemotherapy, cleft palate patients, and Treacher-Collins syndrome.
Źródło:
Nemesis. Negative Effects in Medical Sciences Oral and Maxillofacial Surgery; 2023, 33, 1; 1-44
2593-3604
Pojawia się w:
Nemesis. Negative Effects in Medical Sciences Oral and Maxillofacial Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A second-order sufficient condition for a weak local minimum in an optimal control problem with an inequality control constraint
Autorzy:
Osmolovskii, Nikolai P.
Powiązania:
https://bibliotekanauki.pl/articles/2183496.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
critical cone
quadratic form
first order tangent
second order tangent
second order optimality conditions
weak local minimum
inequality control constraint
Pontryagin’s maximum principle
Opis:
This paper is devoted to a sufficient second-order condition for a weak local minimum in a simple optimal control problem with one control constraint G(u) ≤ 0, given by a C2-function. A similar second-order condition was obtained earlier by the author for a strong minimum in a much more general problem. In the present paper, we would like to take a narrower perspective than before and thus provide shorter and simpler proofs. In addition, the paper uses the first and second order tangents to the set U, defined by the inequality G(u) ≤ 0. The main difficulty of the proof, clearly shown in the paper, refers to the set, where the gradient Hu of the Hamiltonian is small, but the condition of quadratic growth of the Hamiltonian is satisfied. The paper can be valuable for self-explanation and provides a basis for extensions.
Źródło:
Control and Cybernetics; 2022, 51, 2; 151--169
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of spoil materials to develop an equivalent spoil material for physical model tests
Charakterystyka odpadów pogórniczych w celu opracowania materiału równoważnego do modelowania fizycznego
Autorzy:
Garala, Thejesh Kumar
Cui, Ge
Kantesaria, Naman
Heron, Charles M.
Marshall, Alec M.
Žižka, Lukáš
Powiązania:
https://bibliotekanauki.pl/articles/2175665.pdf
Data publikacji:
2022
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
cone penetration testing
laboratory testing
shear strength
soil-water characteristic curve
spoil
sondowanie CPT
badania laboratoryjne
wytrzymałość na ścinanie
krzywa retencji wodnej gruntu
zwałowisko
Opis:
The engineering behaviour of spoil (overburden) needs to be explored either to understand the stability of reservoir slopes under various geological and climatic conditions or for the effective utilisation of reclaimed mines for sustainable infrastructure (e.g., onshore wind turbines). The spoil material is usually considered as highly heterogeneous, and samples collected from the same site can exhibit widely varying characteristics. In this study, spoil material from a mine site in the Czech Republic is characterised using in-situ field tests and laboratory tests. Cone penetration tests were performed in the field and sample cores were collected for laboratory testing. In the laboratory, the index and engineering characteristics of the spoil were evaluated. Given the measured characteristics and behaviour of the field spoil, an equivalent spoil is proposed to perform physical modelling tests using geotechnical centrifuge. This enables simulation of the field spoil behaviour in controlled centrifuge testing, from which other aspects of spoil (e.g. stability of spoil slopes, spoil-structure interaction) can be investigated.
Zachowanie zwałowisk pogórniczych (nadkładu) pod względem inżynieryjnym powinno zostać zbadane w celu określenia stabilności zboczy zbiorników poeksploatacyjnych w różnych warunkach geologicznych i klimatycznych lub w celu efektywnego wykorzystania rekultywowanych kopalń do budowy zrównoważonej infrastruktury (np. lądowych turbin wiatrowych). Materiał zwałowisk pogórniczych jest zwykle uważany za wysoce niejednorodny, a próbki pobrane z tego samego miejsca mogą wykazywać bardzo różne właściwości. W niniejszej pracy, materiał odpadowy z czeskiej kopalni został scharakteryzowany przy użyciu badań terenowych i laboratoryjnych in-situ. W terenie przeprowadzono sondowania CPT, a do badań laboratoryjnych pobrano próbki rdzeniowe. W laboratorium oceniono właściwości indeksowe i inżynieryjne materiału. Biorąc pod uwagę zmierzone cechy i zachowanie się materiału pogórniczego, zaproponowano materiał równoważny do wykonania modelowania fizycznego z wykorzystaniem wirówki geotechnicznej. Umożliwia to symulację zachowania się materiału w kontrolowanych badaniach wirówkowych, na podstawie których można badać inne cechy materiałów pogórniczych (np. stabilność skarp zwałowiska, interakcje zwałowisko-konstrukcja budowlana).
Źródło:
Górnictwo Odkrywkowe; 2022, 63, 4; 23--29
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decentralized multi-agent formation control with pole-region placement via cone-complementarity linearization
Autorzy:
González, Antonio
Sala, Antonio
Armesto, Leopoldo
Powiązania:
https://bibliotekanauki.pl/articles/2172117.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
multiagent autonomous system
formation control
linear matrix inequalities
cone complementarity linearization
system wieloagentowy
sterowanie formacją
liniowe nierówności macierzowe
Opis:
An output-feedback decentralised formation control strategy is pursued under pole-region constraints, assuming that the agents have access to relative position measurements with respect to a set of neighbors in a graph describing the sensing topology. No communication between the agents is assumed; however, a shared one-way communication channel with a pilot is needed for steering tasks. Each agent has a separate copy of the same controller. A virtual structure approach is presented for the formation steering as a whole; actual formation control is established via cone-complementarity linearization algorithms for the appropriate matrix inequalities. In contrast to other research where only stable consensus is pursued, the proposed method allows us to specify settling-time, damping and bandwidth limitations via pole regions. In addition, a full methodology for the decoupled handling of steering and formation control is provided. Simulation results in the example section illustrate the approach.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2022, 32, 3; 415--428
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostic value of cone beam computed tomography in complex and compound odontomas: a systematic review and open classification matrix
Autorzy:
Dubron, Kathia
Gurniak, Anna
Gurniak, Eliza
Politis, Constantinus
Olszewski, Raphael
Powiązania:
https://bibliotekanauki.pl/articles/2129084.pdf
Data publikacji:
2022-05-08
Wydawca:
Presses Universitaires de Louvain
Tematy:
cone beam computed tomography
CBCT
complex odontoma
compound odontoma
odontogenic tumours
Opis:
Objective: Firstly, this review aims to analyse the recent literature about three-dimensional (3D) diagnostic imaging in complex and compound odontomas and compare it to two-dimensional (2D) imaging. Panoramic radiographs help to evaluate the vertical position of odontomas, and occlusal radiographs are used to evaluate the proximity to adjacent teeth. However, cone beam computed tomography (CBCT) can offer volumetric images, and therefore, a more accurate three-dimensional analysis. Secondly, this research aims to construct an open classification matrix for complex and compound odontomas for dentomaxillofacial CBCT radiology protocols based on a systematic literature review. Material and methods: Two systematic literature searches were conducted in PubMed (Medline), on 2 February 2022 concerning classification systems, and on 5 February 2022 concerning CBCT images. Results: In total, these searches revealed 391 papers by reviewing the databases mentioned above. Six articles were selected for inclusion on classification of odontomas and 13 articles were found on CBCT imaging. Consequently, the construction of an open classification matrix for compound and complex odontomas for dentomaxillofacial CBCT radiology protocols was performed using these 19 articles. Conclusions: CBCT offers a more precise position and accurate diagnosis of complex and compound odontomas compared to 2D imaging. Consequently, it enhances the detailed view of the site (multiple or unique), location (intraosseous, partially or completely extragnathic), size, extension (bony expansion, thinning or perforation cortical bone), density and type (denticulo type, particle type, denticulo-particle type, denticulo-amorphous type, amorphous tissue), relationship (with the crown or root of the definitive tooth), adjacent teeth resorption (deciduous or definitive), adjacent teeth (retention or impaction), and distance with adjacent structures (inferior alveolar nerve, sinus maxillaris), as well as adequate surgical planning. Moreover, this research presents an open classification matrix for the most complete description of compound and complex odontomas when analysing CBCT imaging.  
Źródło:
Nemesis. Negative Effects in Medical Sciences Oral and Maxillofacial Surgery; 2022, 23, 1; 1-50
2593-3604
Pojawia się w:
Nemesis. Negative Effects in Medical Sciences Oral and Maxillofacial Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 210

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