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    Wyświetlanie 1-48 z 48
    Tytuł:
    An Android Security Policy Enforcement Tool
    Autorzy:
    Cotterell, K.
    Welch, I.
    Chen, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/226930.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mobile computing
    Java
    Android
    security
    Opis:
    The Android operating system (OS) has become the dominant smart phone OS in recent years due to its accessibility, usability and its open-source philosophy. Consequently, this has also made it a popular target for attackers who aim to install malware on Android devices and take advantage of Android’s coarsegrained, non-revoking permission system. This project designs, implements and evaluates a security tool named COMBdroid, which addresses these security concerns in Android by enforcing fine-grained, user-defined policies. COMBdroid modifies an application before installation, allowing it to override points of security vulnerabilities at run-time. As a proof of concept we have implemented three policies in COMBdroid. This paper documents the development process of COMBdroid, deriving design decisions from the literature review, detailing the design and implementation, and proving the program’s effectiveness through evaluation.
    Źródło:
    International Journal of Electronics and Telecommunications; 2015, 61, 4; 311-320
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Manufacturing and Functions of Complex Yarn and Fabrics
    Wpływ geometrycznych parametrów strukturalnych przędz fantazyjnych na ich właściwości wytrzymałościowe
    Autorzy:
    Lin, C. M.
    Lin, C. W.
    Yang, Y. C.
    Lou, C. W.
    Chen, A. P.
    Lin, J. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/232604.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    siła
    ocena
    funkcjonalny
    elastyczny
    właściwości wytrzmałościowe
    konstrukcja
    rozwój
    strength
    strain
    evaluation
    elastic
    functional
    characterization
    design
    development
    Opis:
    In this research, bamboo charcoal/spandex (BC/S) complex yarn was fabricated using spandex as the core yarn, which was then wrapped with bamboo charcoal nylon textured yarn. The core yarn was first expanded and then wrapped with the wrapping yarn on a rotor twister machine at speeds of 4000, 6000, 8000, 10000, and 12000 r.p.m. The wrapping amount of the BC/S complex yarns were 2, 3, and 4 turns/cm. In order to evaluate the physical properties of the BC/S complex yarn, the maximum breaking strength, elongation, and elastic recovery rate were tested. We fabricated BC/S fabrics using circular knitting based on optimal manufacturing parameters. The BC/S complex yarn had an optimum elastic recovery rate of 98.89% when the rotor speed was 10000 r.p.m and the wrap number 4 turns/cm. The optimum tenacity of the yarn containing 44.0 dtex spandex was 4.22 cN/dtex when the rotor speed was 4000 r.p.m. and the wrap number 2 turns/cm. The anion density of the BC/S fabric increased with the wrap number; in particular, the fabric containing 76.9 dtex spandex displayed an optimum anion density of 54 anions/cc.
    Badano przędze składające się ze zwęglonych włókien bambusowych oraz wysokoelastycznych włókien typu spandex, których użyto jako włókien rdzeniowych. W pierwszej fazie włókna typu spandex ulegały rozciąganiu, a następnie były owijane włóknami bambusowymi przy wykorzystaniu wirnikowej maszyny skręcającej. Dla określenia właściwości fizycznych wyprodukowanych włókien hybrydowych określono wytrzymałość na zerwanie, wydłużenie i stopień odprężności. Wyprodukowano dzianiny na cylindrycznej maszynie dziewiarskiej przy optymalnych parametrach pracy dla uzyskania określonych właściwości dzianiny. Maksymalna wytrzymałość wyprodukowanych włókien hybrydowych wynosiła około 4 cN/dtex. Gęstość anionowa dzianiny wzrastała ze wzrostem ilości oplotów przędzy.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2012, 4 (93); 47-50
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional Properties and Electromagnetic Shielding Behaviour of Elastic Warp-knitted Fabrics
    Właściwości funkcyjne i ekranowanie elektromagnetyczne elastycznych dzianin kolumienkowych
    Autorzy:
    Yu, Z. C.
    He, H. L.
    Lu, Y. H.
    Zhang, J. F.
    Lou, C. W.
    Chen, A. P.
    Lin, J. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/232038.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    functional properties
    electromagnetic shielding effectiveness
    protective clothing
    elastic warp-knitted fabric
    electromagnetic wave
    właściwości funkcjonalne
    skuteczność ekranowania elektromagnetycznego
    odzież ochronna
    elastyczna osnowa-dzianina
    fala elektromagnetyczna
    Opis:
    An investigation was made on the electromagnetic shielding behaviour and other functional properties for manufactured multifunctional elastic warp-knitted fabrics. Bamboo charcoal polyester/Crisscross-section polyester (BC-PET/CSP) blended yarns were used as the back of the warp-knitted fabric while conductive composite yarns were used as the front. The variation in the far infrared emissivity and anion density of elastic-warp knitted fabrics produced with different proportions of BC-PET content were studied in detail. Moreover the electromagnetic shielding effectiveness (EMSE) of the fabrics with different elongation was measured in this study. The experimental results showed that increased elongation almost did not significantly affect the EM shielding behaviour of fabric K1 in the elongation range of 0 - 40%. Finally to increase the EMSE of the fabric, the lamination method was used in this study. EMSE measurement results showed that two layer K1 warpknitted fabrics with 90° interval displayed a better shielding effect against the EM wave compared to that with a 0° interval.
    Przeprowadzono badania właściwości ekranujących przed polem elektromagnetycznym i innych właściwości funkcyjnych wyprodukowanych wielofunkcyjnych elastycznych dzianin kolumienkowych. Zastosowano przędze kompozytowe z mieszanek zawierających drut ze stali kwasoodpornej, ciągłe włókna poliamidowe i poliestrowe oraz cięte włókna ze regenerowanej celulozy z surowca bambusowego. Badano emisyjność w dalekiej podczerwieni i gęstość anionową dzianin kolumienkowych wytworzonych przy rożnych proporcjach zastosowanych składników. Poza tym badano efektywność ochrony elektromagnetycznej dzianin przy rożnych wydłużeniach. Wyniki eksperymentów pokazują, że zwiększone wydłużenie prawie nie wpływa istotnie na właściwości ekranujące. Dla zwiększenia efektu ekranowania zastosowano metodę laminacji.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2015, 5 (113); 78-83
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Failure mechanism and supporting measures for large deformation of soft rock roadway in Baluba copper mine
    Mechanizm pękania skał i kroki zapobiegawcze podejmowane w celu przeciwdziałania odkształceniom chodnika prowadzonego w skałach miękkich w kopalni miedzi Baluba
    Autorzy:
    Wu, A.
    Chen, S.
    Wang, Y.
    Chen, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/219772.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chodnik prowadzony w skałach miękkich
    analiza teoretyczna
    symulacje numeryczne
    eksperymenty w terenie
    parametry podpór stropu
    soft rock roadway
    theoretical analysis
    numerical simulation
    field experiments
    support parameters
    Opis:
    To solve the problem of large deformation soft rock roadway with complicated stress condition in Baluba copper mine, the characteristics of roadway deformation and failure modes are analyzed deeply on the basis of geological survey. Combined with the theoretical analysis and numerical simulation, the new reinforcement technology with floor mudsill and grouting anchor cable is proposed. Moreover, the three dimension numerical simulation model is established by the software FLAC-3D, the support parameter is optimized by it. The results show that the optical array pitch of the U-steel shelf arch is 0.8 m, and the optical array pitch of the grouting anchor cable is 2.4 m. At last, the field experiments are done all over the soft rock roadway. Engineering practice shows that the deformation of soft rock roadway in Baluba copper mine is effectively controlled by adopting the new reinforcement technology, which can provide certain references for similar engineering.
    W celu rozwiązania problemu powstawania znacznych odkształceń chodnika biegnącego w skale miękkiej w skomplikowanym układzie naprężeń, przeprowadzono dogłębną analizę warunków odkształceń i pękania skał w oparciu o badania geologiczne. W oparciu o rozważania teoretyczne i symulacje numeryczne, zaproponowano nową technologię wzmocnienia progu spągowego z iłowców z linami kotwiącymi osadzonymi w zaprawie. Na podstawie trójwymiarowego modelu do symulacji numerycznych opracowanego z wykorzystaniem oprogramowania FLAC-3D dokonano optymalizacji parametrów podpór. Wyniki pokazują, że optymalne rozmieszczenie stalowych podpór wykonanych z profili w kształcie U wyniesie 0.8 m, zaś optymalny rozstaw mocowań lin wynosi 2.4 m. W końcowym etapie przeprowadzono eksperymenty terenowe na całej długości chodnika. Praktyka inżynierska wskazuje, że odkształcenia chodników prowadzonych w skałach miękkich w kopalni Baluba mogą być skutecznie kontrolowane poprzez zastosowanie nowej metody wzmocnienia, która stanowić może podstawę dla opracowywania skutecznych technik wzmacniania stropu w chodnikach prowadzonych w podobnych warunkach geologicznych.
    Źródło:
    Archives of Mining Sciences; 2018, 63, 2; 449-464
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite-difference time-domain solution of second-order photoacoustic wave equation
    Autorzy:
    Rahimzadeh, A.
    Chen, S.-L.
    Powiązania:
    https://bibliotekanauki.pl/articles/173969.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photoacoustic tomography
    numerical simulation
    finite-difference time-domain
    second-order photoacoustic equation
    Opis:
    A finite-difference time-domain numerical solution is presented for solving a single second-order photoacoustic equation, instead of solving three coupled first-order equations. In this way, we are able to insert the heating function to the simulation directly instead of initial pressure. Results are validated using k-Wave simulation and show a good agreement for future development. The perfectly matched layer boundary condition has been implemented for a second-order photoacoustic equation and results are compared to Dirichlet, Neumann and Mur boundary conditions.
    Źródło:
    Optica Applicata; 2016, 46, 3; 435-446
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Particle swarm optimization based fuzzy clustering approach to identify optimal number of clusters
    Autorzy:
    Chen, M.
    Ludwig, S. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/91549.pdf
    Data publikacji:
    2014
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    optimization
    fuzzy clustering
    cluster analysis
    particle swarm optimization (PSO)
    PSO
    fuzzy Sammon mapping
    Sammon mapping
    Opis:
    Fuzzy clustering is a popular unsupervised learning method that is used in cluster analysis. Fuzzy clustering allows a data point to belong to two or more clusters. Fuzzy c-means is the most well-known method that is applied to cluster analysis, however, the shortcoming is that the number of clusters need to be predefined. This paper proposes a clustering approach based on Particle Swarm Optimization (PSO). This PSO approach determines the optimal number of clusters automatically with the help of a threshold vector. The algorithm first randomly partitions the data set within a preset number of clusters, and then uses a reconstruction criterion to evaluate the performance of the clustering results. The experiments conducted demonstrate that the proposed algorithm automatically finds the optimal number of clusters. Furthermore, to visualize the results principal component analysis projection, conventional Sammon mapping, and fuzzy Sammon mapping were used.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2014, 4, 1; 43-56
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent advances in mode converters for a mode division multiplex transmission system
    Autorzy:
    Memon, A. K.
    Chen, K. X.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818205.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    integrated optical device
    mode converters
    mode division multiplex
    optical waveguide
    Opis:
    Adopting mode division multiplex (MDM) technology as the next frontier for optical fiber communication and on-chip optical interconnection systems is becoming very promising because of those remarkable experimental results based on MDM technology to enhance capacity of optical transmission and, hence, making MDM technology an attractive research field. Consequently, in recent years the large number of new optical devices used to control modes, for example, mode converters, mode filters, mode (de)multiplexers, and mode-selective switches, have been developed for MDM applications. This paper presents a review on the recent advances on mode converters, a key component usually used to convert a fundamental mode into a selected high-order mode, and vice versa, at the transmitting and receiving ends in the MDM transmission system. This review focuses on the mode converters based on planar light wave circuit (PLC) technology and various PLC-based mode converters applied to the above two systems and realized with different materials, structures, and technologies. The basic principles and performances of these mode converters are summarized.
    Źródło:
    Opto-Electronics Review; 2021, 29, 1; 13--32
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical properties of cumin and caraway seeds
    Autorzy:
    Zare, D.
    Bakhshipour, A.
    Chen, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/26266.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    Physical properties of cumin and caraway seeds were measured and compared at constant moisture content of 7.5% w.b. The average thousand mass of grain, mean length, mean width, mean thickness, equivalent diameter, geometric meann diameter, surface area, volume, sphericity, aspect ratio, true density, bulk density and porosity were measured for cumin and caraway. There are significant differences (p<0.01) in most physical properties of cumin and caraway, except porosity and sphericity.
    Źródło:
    International Agrophysics; 2013, 27, 4
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Boiling, steaming or rinsing? (the physics of chinese cuisine)
    Gotować, gotować na parze czy może płukać? (fizyka kuchni chińskiej)
    Autorzy:
    Varlamov, A.
    Zhou, Z.
    Chen, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/129558.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    complex organic molecules
    proteins
    damplings
    heat transfer
    temperature conductivity
    Fourier law
    Newton's law of cooling
    złożone molekuły organiczne
    proteiny
    kluski
    przenoszenie ciepła
    przewodnictwo temperaturowe
    prawo Fouriera
    Newtonowskie prawo chłodzenia
    Opis:
    Some physical aspects of Chinese cuisine are discussed. We start from the cultural and historical particularities of Chinese cuisine and their food production technologies. What is the difference between raw and boiled meat? What is the difference in the physical processes of heat transfer during either the steaming of dumplings or during cooking them in boiling water? Why is it possible to cook meat stripes in a "hot pot" in ten seconds, whilst baking a turkey requires several hours? This article is devoted to a discussion of these questions.
    W artykule zostały przedyskutowane niektóre aspekty kuchni chińskiej. Autorzy zaczynają od omówienia szczegółów kuchni chińskiej i technologii produkcji żywności. Autorzy zadają następujące pytania: jaka jest różnica pomiędzy mięsem surowym a gotowanym? Jaka jest różnica w fizyce procesu przenoszenia ciepła podczas przyrządzania klusków na parze wodnej a w gotującej się wodzie? Dla czego jest możliwe przyrządzanie kawałków mięsa w "gorącym garnku" w ciągu kilku sekund, podczas gdy po to, aby upiec indyka potrzebujemy kilku godzin? Artykuł ten udziela odpowiedzi na te i inne pytania.
    Źródło:
    Physics for Economy; 2018, 2, No.1; 55-68
    2544-7742
    2544-7750
    Pojawia się w:
    Physics for Economy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Engineering example of the constraint forces in non-holonomic mechanical: forklift-truck robot motion. Part I
    Autorzy:
    Haddout, S.
    Guennoun, M. A.
    Chen, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/230034.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    forklift-truck robot
    Lagrangian systems
    nonholonomic constraints
    reduced equations of motion
    numerical solution
    Opis:
    In the presented paper, a problem of nonholonomic constrained mechanical systems is treated. New methods in nonholonomic mechanics are applied to a problem of a Forklift-truck robot motion. This method of the geometrical theory of general nonholonomic constrained systems on fibered manifolds and their jet prolongations, based on so-called Chetaev-type constraint forces. The relevance of this theory for general types of nonholonomic constraints, not only linear or affine ones, was then verified on appropriate models. On the other hand, the equations of motion of a Forklift-truck robot are highly nonlinear and rolling without slipping condition can only be expressed by nonholonomic constraint equations. In this paper, the geometrical theory is applied to the above mentioned mechanical problem. The results of numerical solutions of constrained equations of motion, derived within the theory, are presented.
    Źródło:
    Archives of Control Sciences; 2018, 28, 3; 483-506
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimized design and analysis of offshore Beidou maritime foundation reinforcement system pseudolite ranging-codes
    Autorzy:
    Su, D.
    Zhou, A.
    Zhou, Z.
    Chen, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/260498.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Beidou pseudolite
    ranging-codes
    optimized
    3-taps
    Opis:
    Under the bad sea conditions and weak Beidou navigation signal environment, it is difficult to locate the ship on the sea, and the Beidou navigation system can’t work well. Beidou pseudolite system can improve the performance of Beidou navigation system as a navigation signal transmitter fixed on the ground, the signal of which can improve satellite positioning constellation structure, and improve the system availability reliability and precision. In order to ensure the interoperability and non-correlation of the Beidou pseudolite and the Beidou navigation system, the pseudolite ranging-codes should be selected in the same code space of the satellite ranging-codes and the residual pseudo random code generated by the 2 taps design scheme does not satisfy the performance requirements of the ranging-codes. To solve this issue, a combined design scheme with 3 taps is proposed, and 12 kinds of pseudolite ranging-codes are optimally selected according to the optimum design parameters of ranging-codes. The waveform and correlation of the selected pseudolite ranging-codes are analyzed by MATLAB, the acquisition simulation is carried out by using the new pseudolite ranging-codes. The experimental results show that the new 3-taps based ranging codes design scheme behaves a good balance, correlation and spectral characteristics.
    Źródło:
    Polish Maritime Research; 2017, S 2; 45-52
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-objective optimization of stope structure parameters in broken rock conditions using grey relational analysis
    Wielo-kryterialna optymalizacja parametrów struktury przodka wybierkowego w warunkach pękania skał przy wykorzystaniu „szarej” analizy relacyjnej
    Autorzy:
    Chen, S.
    Wu, A.
    Wang, Y.
    Cheng, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/219180.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    szara analiza relacyjna
    parametry struktury przodka wybierkowego
    pękanie skał
    symulacje numeryczne
    model Taguchi projektowania eksperymentu
    grey relational analysis
    stope structure parameters
    in broken rock conditions
    numerical simulation
    taguchi experiment design
    Opis:
    In order to optimize the stope structure parameters in broken rock conditions, a novel method for the optimization of stope structure parameters is described. The method is based on the field investigation, laboratory tests and numerical simulation. The grey relational analysis (GRA) is applied to the optimization of the stope structure parameters in broken rock conditions with multiple performance characteristics. The influencing factors include stope height, pillar diameter, pillar spacing and pillar array pitch, the performance characteristics include maximum tensile strength, maximum compressive strength and ore recovery rate. The setting of influencing factors is accomplished using the four factors four levels Taguchi experiment design method, and 16 experiments are done by numerical simulation. Analysis of the grey relational grade indicates the first effect value of 0.219 is the pillar array pitch. In addition, the optimal stope structure parameters are as follows: the height of the stope is 3.5 m, the pillar diameter is 3.5 m, the pillar spacing is 3 m and the pillar array pitch is 5 m. In-situ measurement shows that all of the pillars can basically remain stable, ore recovery rate can be ensured to be more than 82%. This study indicates that the GRA method can efficiently applied to the optimization of stope structure parameters.
    W pracy zaproponowano nową metodę optymalizacji parametrów struktury przodka wybierkowego prowadzonego w warunkach pękania skał. Metoda opiera się na badaniach terenowych, wykorzystuje także badania laboratoryjne oraz symulacje numeryczne. Do optymalizacji parametrów struktury przodka wybierkowego prowadzonego w warunkach pękania skał dla wielu wariantów charakterystyki górotworu wykorzystano ‘szarą’ analizę relacyjną (GRA – Grey Relational Analysis). Uwzględnione czynniki wpływu to wysokość przodka, średnica filarów, rozstaw filarów, rozmieszczenie filarów oraz charakterystyki górotworu: maksymalna wytrzymałość na rozciąganie oraz ściskanie oraz uzysk rudy. Ustawienia czynników wpływu dokonano z wykorzystaniem czterech czynników i dla czterech poziomów wg metody Taguchi planowania eksperymentów; ponadto 16 eksperymentów wykonano z wykorzystaniem symulacji numerycznych. Wyniki ‘szarej’ analiza relacyjnej wskazują, że wartość efektywna dla pierwszego z czynników, czyli rozmieszczenia filarów, wyniosła 0.219. Ponadto, otrzymano następujące optymalne parametry przodka: wysokość przodka 3.5 m; średnica filarów 3.5 m, rozstęp pomiędzy filarami 3 m, rozciągłość filarów 5 m. Pomiary przeprowadzone in situ wykazały, że wszystkie filary zasadniczo powinny zachować stabilność, a uzysk rudy przekroczyć może 82%. Wyniki wskazują, że ‘szara’ analiza relacyjna może być z powodzeniem wykorzystywana do optymalizacji parametrów struktury przodka wybierkowego.
    Źródło:
    Archives of Mining Sciences; 2018, 63, 2; 269-282
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Morphogenetic Description of Thigmokeronopsis stoecki Shao et al., 2008 (Ciliophora, Hypotricha) and a Comparison with Members of the Family Pseudokeronopsidae
    Autorzy:
    Chen, Xumiao
    Li, Jiqiu
    Hu, Xiaozhong
    Shao, Chen
    Al-Farraj, Saleh A.
    Al-Rasheid, Khaled A. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/763473.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Hypotrichs, ontogenesis, Pseudokeronopsidae, Thigmokeronopsis
    Opis:
    The urostylid family Pseudokeronopsidae Borror and Wicklow, 1983 was considered to be a well-outlined taxon. Nevertheless, recent evidence, including morphological, ontogenetic, and molecular information, has consistently revealed the polyphyly of this family. In the present work, a new population of Thigmokeronopsis stoecki Shao et al., 2008 was found and its binary divisional process was described for the first time. In addition, the morphogenetic features of Thigmokeronopsis species and all the other pseudokeronopsids, for which detailed ontogenetic data are available, were rechecked and compared. This reveals that: (1) the ontogenetic process of T. stoecki corresponds well with its congeners T. jahodai and T. rubra except for the macronuclear behavior; (2) Apokeronopsis and Thigmokeronopsis share a similar ontogenetic mode despite of the differences in the number and origin of their buccal cirri; (3) most pseudokeronopsids share the same pattern in the origins of their oral primordia and fronto-ventral-transverse cirral anlagen, except for Pseudokeronopsis similis, which may not be a valid member of the family Pseudokeronopsidae.
    Źródło:
    Acta Protozoologica; 2013, 52, 2
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Suitability of sixteen asparagus cultivars for growing in Polish environmental conditions
    Autorzy:
    Knaflewski, M.
    Kaluzewicz, A.
    Chen, W.
    Zaworska, A.
    Krzesinski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2145.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Ogrodnictwa
    Tematy:
    Asparagus officinalis
    asparagus cultivar
    environment condition
    Polska
    marketable yield
    plant growth index
    growing
    Źródło:
    Journal of Horticultural Research; 2014, 22, 2
    2300-5009
    Pojawia się w:
    Journal of Horticultural Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved Roberts focusing evaluation method for an autofocusing system
    Autorzy:
    Yin, A.
    Dai, Z.
    Chen, B.
    Li, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/173381.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    focus evaluation function
    evaluation window
    autofocusing
    Opis:
    In this paper, a new focusing evaluation method based on local 2/8 center windows is proposed for an autofocusing system. We have proposed an evaluation function which improved the Roberts function with eight-neighborhood or four-neighborhood. The approximate optimal criteria window is selected by a 2/8 rule. Comparative experiments implemented with other methods have shown that the 2/8 rule method not only can find the approximate optimal evaluation window quickly, but also has better generality. This evaluation function of improved Roberts’ function has higher sensitivity and better real-time performance.
    Źródło:
    Optica Applicata; 2013, 43, 3; 529-538
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fine mapping of high-temperature adult-plant resistance to stripe rust in wheat cultivar Louise
    Autorzy:
    Nazarov, T.
    Chen, X.
    Carter, A.
    See, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082816.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    durable resistance
    expressed sequence tag
    molecular marker
    Puccinia strii-
    formis
    Triticum aestivum
    Opis:
    Bread wheat is a major food crop on a global scale. Stripe rust, caused by Puccinia strii- formis f. sp. tritici, has become one of the largest biotic stresses and limitations for wheat production in the 21st century. Post 2000 races of the pathogen are more virulent and able to overcome the defense of previously resistant cultivars. Despite the availability of effective fungicides, genetic resistance is the most economical, effective, and environmen- tally friendly way to control the disease. There are two major types of resistance to stripe rust: all-stage seedling resistance (ASR) and adult-plant resistance (APR). Although both resistance types have negative and positive attributes, ASR generally is race-specific and frequently is defeated by new races, while APR has been shown to be race non-specific and durable over time. Finding genes with high levels of APR has been a major goal for wheat improvement over the past few decades. Recent advancements in molecular mapping and sequencing technologies provide a valuable framework for the discovery and validation of new sources of resistance. Here we report the discovery of a precise molecular marker for a highly durable type of APR – high-temperature adult-plant (HTAP) resistance locus in the wheat cultivar Louise. Using a Louise × Penawawa mapping population, coupled with data from survey sequences of the wheat genome, linkage mapping, and synteny analysis techniques, we developed an amplified polymorphic sequence (CAPS) marker LPHTAP2B on the short arm of wheat chromosome 2B, which cosegregates with the resistant pheno- type. LPHTAP2B accounted for 62 and 58% of phenotypic variance of disease severity and infection type data, respectively. Although cloning of the LPHTAP2B region is needed to further understand its role in durable resistance, this marker will greatly facilitate incorpo- ration of the HTAP gene into new wheat cultivars with durable resistance to stripe rust.
    Źródło:
    Journal of Plant Protection Research; 2020, 60, 2; 126-133
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Speed Heterostructure Metal-Semiconductor-Metal Photodetectors
    Autorzy:
    Cola, A.
    Nabet, B.
    Chen, X.
    Quaranta, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041621.pdf
    Data publikacji:
    2005-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.60.-q
    73.40.Sx
    06.60.Jn
    Opis:
    In this work we review the properties of a class of metal-semiconductor-metal photodetectors based on heterojunction structures. Particularly, an AlGaAs/GaAs device is detailed in which the absorption region is in the GaAs layer, and a two-dimensional electron gas is formed at the heterointerface due toδ-doping of the widegap material. This heterostructure metal-semiconductor-metal photodetector also contains an AlGaAs distributed Bragg reflector that forms a resonant cavity for detection at 850 nm. The beneficial effect of the two-dimensional electron gas in the GaAs absorption layer in terms of speed and sensitivity is demonstrated by comparing samples with and without doping in the AlGaAs layer. The design and the physical properties of the grown epitaxial structure are presented, together with the static and dynamic characteristics of the device in time domain. In particular, photocurrent spectra exhibit a 30 nm wide peak at 850 nm, and time response measurements give a bandwidth over 30 GHz. A combination of very low dark current and capacitance, fast response, wavelength selectivity, and compatibility with high electron mobility transistors makes this device suitable for a number of application areas, such as Gigabit and 10 Gigabit Ethernet, wavelength division multiplexing, remote sensing, and medical applications.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 1; 14-25
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new brontothere from the Eocene of South China
    Autorzy:
    Averianov, A.
    Danilov, I.
    Chen, W.
    Jin, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/21665.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    The upper Eocene Youganwo Formation in Maoming Province, Guangdong Province, China, produced abundant remains of turtles and crocodiles, but mammalian remains are rare. The previously found mammals from Youganwo Formation include a nimravid carnivore and an amynodontid perissodactyl. Here we report on a new brontotheriid perissodactyl from the Youganwo Formation. Maobrontops paganus gen. et sp. nov. is described based on a maxillary fragment with P4 and M1–2 (SYSU-M-4). Maobrontops paganus gen. et sp. nov. is characterized by the combination of a simple P4 without a hypocone with derived molars having large molar fossae and large anterolingual cingular cusp. A parsimony implied weighting character analysis places Maobrontops gen. nov. in the clade Embolotheriita as a sister taxon to the terminal subclade containing Nasamplus, Protembolotherium, and Embolotherium. Maobrontops paganus gen. et sp. nov. is one of the largest Asian brontotheres. The brontotheriid fauna of South China is endemic and includes at least three valid taxa: Dianotitan from Brontotheriita and Pygmaetitan and Maobrontops gen. nov. from Embolotheriita.
    Źródło:
    Acta Palaeontologica Polonica; 2018, 63, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties of a Bainitic Steel Producible by Hot Rolling
    Autorzy:
    Rana, R.
    Chen, S.
    Haldar, A.
    Das, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/352494.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    carbide-free bainite
    retained austenite
    hot rolling
    mechanical properties
    Opis:
    A carbide-free bainitic microstructure is suitable for achieving a combination of ultra high strength and high ductility. In this work, a steel containing nominally 0.34C-2Mn-1.5Si-1Cr (wt.%) was produced via industrial hot rolling and laboratory heat treatments. The austenitization (900°C, 30 min.) and austempering (300-400°C, 3 h) treatments were done in salt bath furnaces. The austempering treatments were designed to approximately simulate the coiling step, following hot rolling and run-out-table cooling, when the bainitic transformation would take place and certain amount of austenite would be stabilized due to suppression of carbide precipitation. The microstructures and various mechanical properties (tensile properties, bendability, flangeability, and room and subzero temperature impact toughness) relevant for applications were characterized. It was found that the mechanical properties were highly dependent on the stability of the retained austenite, presence of martensite in the microstructure and the size of the microstructural constituents. The highest amount of retained austenite (~ 27 wt.%) was obtained in the sample austempered at 375°C but due to lower austenite stability and coarser overall microstructure, the sample exhibited lower tensile ductility, bendability, flangeability and impact toughness. The sample austempered at 400°C also showed poor properties due to the presence of initial martensite and coarse microstructure. The best combination of mechanical properties was achieved for the samples austempered at 325-350°C with a lower amount of retained austenite but with the highest mechanical stability.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2331-2338
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Taxonomic Descriptions of Two Marine Ciliates, Euplotes dammamensis n. sp. and Euplotes balteatus (Dujardin, 1841) Kahl, 1932 (Ciliophora, Spirotrichea, Euplotida), Collected from the Arabian Gulf, Saudi Arabia
    Autorzy:
    Chen, Xumiao
    Zhao, Yan
    Al-Farraj, Saleh A.
    AL-QURAISHY, Saleh
    El-Serehy, Hamed A.
    Shao, Chen
    Al-Rasheid, Khaled A. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/763475.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Marine ciliate, morphogenesis, morphology, new species, SSU-rRNA, taxonomy
    Opis:
    The morphology, morphogenesis and infraciliature of two marine euplotid ciliates, Euplotes dammamensis n. sp. and Euplotes balteatus (Dujardin, 1841) Kahl, 1932, isolated from a sandy beach of the Arabian Gulf, Saudi Arabia, were investigated using observations in vivo and protargol-impregnation methods. Euplotes dammamensis n. sp. is characterized by a combination of features including its huge body size (100–170 × 80–120 μm), 10 conspicuous dorsal ridges, 10 normal-sized frontoventral and two marginal cirri, and 11 dorsal kineties. Euplotes balteatus is mainly characterized by 10 frontoventral, two caudal, and two left marginal cirri, 7–10 dorsal kineties and 5–7 prominent dorsal ridges as well as double-eurystomus silverline system. The small subunit rRNA (SSU-rRNA) gene sequences were determined for both species and phylogenetic analyses based on these data indicated that E. dammamensis is most closely related to E. parabalteatus Jiang et al., 2010, and E. balteatus clusters with E. plicatum Valbonesi et al., 1997, E. orientalis Jiang et al., 2010, and E. bisulcatus Kahl, 1932.
    Źródło:
    Acta Protozoologica; 2013, 52, 2
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sustainable operation of surface-groundwater conjunctive use systems in the agricultural sector
    Autorzy:
    Chen, Tzu-Chia
    Hsieh, Tsung-Shun
    Shichiyakh, Rustem A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048534.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    agriculture
    conjunctive use systems
    groundwater
    operating cost
    surface water
    water management
    Opis:
    Several conjunctive use approaches can be distinguished. Drought cycling of groundwater (GW) usage and storage relies on more surface water (SW) during wetter years and delivers more water from GW during drought years. This method has the benefit of temporal changes in water availability. Additionally, it is usually desirable in areas with internal variability of SW where surface storage of wet-year surpluses is uneconomical, suffer excessive evaporative losses, or cause unacceptable environmental disruption. In previous studies, the purpose of operating the drought cycling was to reduce operating costs. In these studies, the objective function of the proposed model was to minimise the present value cost derived from the system design and operation to satisfy a predefined demand during a finite planning and operation horizon. However, it is important to consider other objectives in operating water resources systems, including minimising water shortages accurately. Hence, in this study, two scenarios were focused on: 1) mi-nimising water shortagages, 2) minimising operational costs. Pareto solutions are then presented with the objectives of minimising costs and water deficit. In this study, the weighting method has been used to extract Pareto options. The results show that reducing costs from 234 to 100 mln USD will increase water shortage from 9.3 to 11.3 mln m3.
    Źródło:
    Journal of Water and Land Development; 2021, 51; 25-29
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surfactant assisted removal of engine oil from synthetic soil
    Autorzy:
    Ramamurthy, A. S.
    Chen, Z.
    Li, X.
    Azmal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/207953.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sodium dodecyl sulfate
    SDS
    desorption
    polyethylene oxides
    sodium
    sodium sulfate
    soils
    surface active agents
    dodecylosiarczan sodu
    surfaktanty anionowe
    desorpcja
    tlenki polietylenu
    sód
    siarczan sodowy
    gleba
    środki powierzchniowo czynne
    detergenty
    Opis:
    Effectiveness of surfactants SDS (sodium dodecyl sulfate), AOT (sodium dioctyl sulfosuccinate) and Brij 35 (polyoxyethylene lauryl ether) in removing residual oil from soils have been determined. Experimental results indicated that oil desorption efficiencies with surfactants are 7 to 18 times higher than using water alone. 0.6% Brij 35 at was the most effective surfactant to remove oil from soil, and it did not display any significant change in oil desorption with pH changes. A comparison study also showed that pore volume was a more significant parameter than soil washing flow rate to improve oil desorption.
    Źródło:
    Environment Protection Engineering; 2015, 41, 2; 67-79
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bayesowski model wzrostu niezawodności oparty na dynamicznych parametrach rozkładu
    Bayesian reliability growth model based on dynamic distribution parameters
    Autorzy:
    Tao, Y.
    Zhang, Y. A.
    Chen, X.
    Ming, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/301037.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    statystyka populacji niejednorodnej
    model monotoniczny
    Bayes
    model przyrostu niezawodności
    rozkład wykładniczy
    non-homo geneous population statistics
    monotone model
    reliability growth model
    exponential distribution
    Opis:
    W artykule przestudiowano metody analizy statystycznej na różnych etapach wzrostu niezawodności w oparciu o model monotoniczny. Zamodelowano zmiany jakim dynamiczne parametry rozkładu podlegają podczas badań. Podano bayesowskie modele wzrostu niezawodności dla licznych etapów wzrostu niezawodności. Na koniec metodę zweryfikowano w oparciu o przykład praktyczny.
    In this paper we study the statistical analysis methods at different stages of reliability growth based on the monotone model. The changes of dynamic distribution parameters during test are modeled. Bayesian reliability growth models for multiple stages of reliability growth are given. Finally the method is validated by a practical example.
    Źródło:
    Eksploatacja i Niezawodność; 2010, 2; 13-16
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrated design of observer based fault detection for a class of uncertain nonlinear systems
    Autorzy:
    Chen, W.
    Khan, A, Q.
    Abid, M.
    Ding, S. X.
    Powiązania:
    https://bibliotekanauki.pl/articles/907595.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    detekcja uszkodzeń
    obserwator
    system nieliniowy
    optymalizacja
    odporność
    fault detection
    observer
    nonlinear system
    optimization
    robustness
    Opis:
    Integrated design of observer based Fault Detection (FD) for a class of uncertain nonlinear systems with Lipschitz nonlinearities is studied. In the context of norm based residual evaluation, the residual generator and evaluator are designed together in an integrated form, and, based on it, a trade-off FD system is finally achieved in the sense that, for a given Fault Detection Rate (FDR), the False Alarm Rate (FAR) is minimized. A numerical example is given to illustrate the effectiveness of the proposed design method.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 423-430
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The implementation of the Balanced Critical Factor Index methodology in the strategy redevelopment process
    Autorzy:
    Rymaszewska, A.
    Koskinen, J.
    Takala, J.
    Zhao, S.
    Chen, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/407087.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Balanced Critical Factor Index
    BCFI
    decision-making
    strategy
    Opis:
    Strategic planning and development is a critical yet often overlooked issue in company's operations. The planning of development as well as addressing the distribution of available resources should be done systematically rather than instinctively however, many companies still do not have any reliable method that would facilitate the decision making processes at their disposal. This article aims at presenting the innovative analytical method- Balanced Critical Factor Index (BCFI) for addressing the need for change in company's operational strategy according to changes in available technology and knowledge. By examining a wide array of indexes, the presented method is expected to suggest the directions of development. The presented method also addresses the challenges of the complex process of decision-making. Moreover, the empirical evidence gathered in the studied case company serves as a source of important feedback regarding the further improvement of the BCFI method.
    Źródło:
    Management and Production Engineering Review; 2013, 4, 1; 50-56
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring of high-speed shaft of gas turbine using artificial neural networks: predictive model application
    Autorzy:
    Rahmoune, M. B.
    Hafaifa, A.
    Abdellah, K.
    Chen, X. Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/328726.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    monitoring
    gas turbine
    vibrations
    artificial neural networks
    predictive model
    turbina gazowa
    drgania
    sztuczna sieć neuronowa
    model predykcyjny
    Opis:
    The automatic engineering known a very rapid progress with the consequent development of numerical methods and computer systems, by the growth of computational capacity. In this context, this work proposes a strategy of predictive control of the high-pressure shaft speed of a gas turbine using artificial neural networks in order to monitor the vibratory behavior of this rotating machine. This approach makes it possible to ensure the stability of this turbine under real conditions and to detect any deviation of their dynamic behavior from the margin of safety. This approach makes it possible to include the control limitations on the turbine variables in the modeling step of the high-speed shaft speed controller.
    Źródło:
    Diagnostyka; 2017, 18, 4; 3-10
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defects in Dilute Nitrides
    Autorzy:
    Chen, W. M.
    Buyanova, I. A.
    Tu, C. W.
    Yonezu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043705.pdf
    Data publikacji:
    2005-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ji
    71.55.Eq
    76.70.Hb
    Opis:
    We provide a brief review of our recent results from optically detected magnetic resonance studies of grown-in non-radiative defects in dilute nitrides, i.e. Ga(In)NAs and Ga(Al,In)NP. Defect complexes involving intrinsic defects such as As$\text{}_{a}$ antisites and Ga$\text{}_{i}$ self-interstitials were positively identified. Effects of growth conditions, chemical compositions and post-growth treatments on formation of the defects are closely examined. These grown-in defects are shown to play an important role in non-radiative carrier recombination and thus in degrading optical quality of the alloys, harmful to performance of potential optoelectronic and photonic devices based on these dilute nitrides.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 4; 571-579
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Pressure Studies of Semiconductors in the Far-Infrared: Donor States in Quasi-2D
    Autorzy:
    Weinstein, B. A.
    Tischler, J. G.
    Chen, R. J.
    Nickel, H. A.
    McCombe, B. D.
    Dzyubenko, A. B.
    Sivachenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014129.pdf
    Data publikacji:
    2000-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Fd
    73.20.Dx
    73.20.Hb
    Opis:
    We review recent experimental advances by the Buffalo group in performing far-infrared magnetospectroscopy under fine tuning of applied high hydrostatic pressure. Experiments are reported for the effects of pressure on Si donors in modulation doped GaAs/AlGaAs quantum wells. We clearly observe pressure-mediated competition between free (i.e., Landau level) and bound electron states - the latter arising from both neutral (D$\text{}^{0}$) and charged (D$\text{}^{-}$) donor species. With increasing pressure, there is a progression of the observed spectra from being dominated by cyclotron resonance and the D$\text{}^{-}$ singlet (or singlet-like bound magnetoplasmon) transitions, to showing the D$\text{}^{0}$ 1s → 2p$\text{}^{+}$ line. The main reason for this evolution is the decrease in electrons due to the crossover of the Si levels associated with the Γ (well) and X (barrier) conduction minima. Indeed, for pressures above 30 kbar the Γ(well)-X(barrier) crossover quenches all the transitions. However, we find strong evidence that electrons are independently lost to a trap, which becomes active several kbar below this crossing. A possible candidate for this trap is residual Se impurities in the barriers. We present the results of detailed numerical calculation which are found to agree very well with the measured field dependencies of the cyclotron resonance, D$\text{}^{0}$ and D$\text{}^{-}$ transition energies. In the sample with the highest doping, a new transition is observed for fields and pressures above 7.5 T and 5 kbar. Reasons for this apparent anomaly are discussed.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 3; 241-257
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Redefinition and Reassignment of the 18-cirri Genera Hemigastrostyla, Oxytricha, Urosomoida, and Actinotricha (Ciliophora, Hypotricha), and Description of One New Genus and Two New Species
    Autorzy:
    Shao, Chen
    Song, Weibo
    Al-Rasheid, Khaled A. S.
    Berger, Helmut
    Powiązania:
    https://bibliotekanauki.pl/articles/763642.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    China, Heterooxytricha gen. nov., review, Spirotricha, Stichotrichia, Yellow Sea
    Opis:
    The morphology, the infraciliature, and two stages of physiological reorganization of Hemigastrostyla elongata spec. nov.,isolated from the Yellow Sea near Qingdao (China), are described. The new species differs from the type H. stenocephala, inter alia, by the length of the dorsal bristles and the position of the pretransverse ventral cirri; from H. enigmatica by the number of caudal cirri; and from H. para-enigmatica spec. nov. – established for the H. enigmatica populations from the Yellow Sea – by the arrangement of the postoral ventral cirri and the cortical granulation. A key to the Hemigastrostyla species and some other 18-cirri hypotrichs is provided. Hemigastrostyla szaboi is fixed as type species of Heterooxytricha gen. nov. because the type population lacks the extra cirri which are characteristic for Hemigastrostyla. In addition, Oxytricha geleii is assigned to this new genus, whose species have, like many oxytrichids, 18 frontal-ventraltransverse cirri, but a Gonostomum dorsal kinety pattern. The old, large, and difficult genus Oxytricha is briefly reviewed, mainly on the basis of the dorsal kinety pattern. Very likely, only species with the Oxytricha pattern belong to this genus. Oxytricha marcili and O. pseudofurcata, which have the Urosomoida kinety pattern (i.e. kinety 3 fragmentation lacking), are transferred to Urosomoida which is, inter alia, defined by a more or less distinctly reduced number of ventral and transverse cirri. Some other Oxytricha species with this kinety pattern (O. islandica, O. lanceolata, O. pseudosimilis, O. setigera) are not transferred to Urosomoida, but preliminarily classified as incertae sedis in Oxytricha, because they have the full set of 18 cirri. The available molecular data on O. lanceolata indicate that this type of 18-cirri hypotrichs likely needs a genus of its own because O. lanceolata does not cluster with O. granulifera, type of this genus. The marine Actinotricha saltans, classified for a very long time in Oxytricha, seems to be a non-dorsomarginalian hypotrich according to molecular data, justifying the reactivation of the old genus Actinotricha. Oxytricha shii has a multiple dorsal kinety 3 fragmentation, three dorsomarginal rows, and the undulating membranes arranged in the Cyrtohymena pattern, strongly indicating that it is a member of the subgenus Cyrtohymena (Cyrtohymenides). This brief review is a further step to unravel the complicated systematics of the old, but still little-known genus Oxytricha. The following new combinations are made in this paper: Cyrtohymena (Cyrtohymenides) shii (Shi et al., 1997) comb. nov.; Heterooxytricha szaboi (Wilbert and Song, 2005) comb. nov.; Heterooxytricha geleii (Wilbert, 1986) comb. nov.; Urosomoida marcili (Paiva and Silva-Neto, 2004) comb. nov.; Urosomoida pseudofurcata (Berger, 1999) comb. nov.
    Źródło:
    Acta Protozoologica; 2011, 50, 4
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Breast Pain and Sports Bra Usage Reported by Chinese Women: Why Sports Bra Education Programs are Needed in China
    Ból piersi i użytkowanie biustonosza sportowego: dlaczego programy edukacyjne o biustonoszu sportowym są potrzebne w Chinach
    Autorzy:
    Chen, Xiaona
    Wang, Jianping
    Wang, Yanzhen
    Gho, Sheridan A.
    Steele, Julie R.
    Powiązania:
    https://bibliotekanauki.pl/articles/233497.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    breast pain
    sports bra usage
    bra fit
    bra size
    education program
    ból piersi
    biustonosz sportowy
    dopasowanie biustonosza
    rozmiar biustonosza
    program edukacyjny
    Opis:
    This study aimed to evaluate breast pain and sports bra usage reported by Chinese women and to analyse whether they were affected by age, education, occupation, income or breast size. Four hundred and four Chinese women completed a questionnaire to determine their breast pain and its frequency as well as sports bra usage. Although more than 60% of Chinese women experienced breast pain during exercise, only 40% of them had ever worn a sports bra. The high percentage of participants who experienced breast pain and low percentage of sports bra usage confirmed the need to educate Chinese women on sport bra fit, design and reasons for wearing sports bras. Age, bra size and income level should be considered when implementing these educational programs.
    Celem badania była ocena bólu piersi i użytkowania biustonosza sportowego oraz analiza wyników ze względu na wiek, wykształcenie, zawód, dochód i rozmiar piersi użytkowniczek. Czterysta cztery chińskie kobiety wypełniły kwestionariusz w celu określenia bólu piersi i jego częstotliwości, a także użycia biustonosza sportowego. Chociaż ponad 60% chińskich kobiet doświadczyło bólu podczas ćwiczeń, tylko 40% z nich nosiło stanik sportowy. Wysoki odsetek uczestniczek, które doświadczyły bólu piersi i niskiego odsetka użycia biustonosza sportowego, potwierdziły potrzebę edukowania chińskich kobiet na temat sportowego dopasowania biustonosza, projektowania i powodów noszenia sportowych biustonoszy. Przy realizacji tych programów edukacyjnych należy wziąć pod uwagę wiek, rozmiar biustonosza i poziom dochodów użytkowniczek.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2019, 4 (136); 17-22
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Afamin and adropin in patients with alcohol-induced liver cirrhosis
    Autorzy:
    Prystupa, A.
    Kiciński, P.
    Luchowska-Kocot, D.
    Sak, J.
    Prystupa, T.
    Chen, K.-H.
    Chen, Y.-H.
    Panasiuk, L.
    Załuska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2081906.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    alcoholic liver cirrhosis
    Adropin
    Child-Pugh score
    afamin
    Opis:
    The aim of the study was to determine serum concentrations of afamin and adropin in patients with alcoholic liver cirrhosis and to define their correlation with the stage of disease. The study included 99 patients with alcoholic cirrhosis from the region of Lublin, (Eastern Poland). Liver cirrhosis was diagnosed based on clinical features, history of heavy alcohol consumption, laboratory tests and abdominal ultrasonography. The control group consisted of 20 healthy individuals without liver disease who did not abuse alcohol. The serum afamin and adropin concentrations were determined using ELISA kits. The concentration of afamin was found to be significantly lower in patients with compensated alcoholic liver cirrhosis, i.e. P-Ch B (85.1±40.6 μg/ml) and P-Ch C (56.4±32.3 μg/ml) individuals, compared to the control group (135.9±43.6 μg/ml); p-value was <0.01 and <0.001, respectively. As far as adropin is concerned, a reverse relationship was demonstrated: the highest concentration was found in patients with P-Ch C (11.7±5.7 ng/ml) cirrhosis. Furthermore, the above concentration was significantly higher compared to patients with P-Ch A cirrhosis (7.2±2.8 ng/ml; p<0.05) and controls (7.5±2.6 ng/ml; p<0.05). The concentration of afamin decreases with the severity of alcoholic liver cirrhosis, which most likely results from impaired hepatic synthesis. Otherwise, the higher the stage of disease according to the Child-Pugh score, the higher the concentration of adropin.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2018, 25, 3; 527-531
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New data on the anatomy of fuxianhuiid arthropod Guangweicaris spinatus from the lower Cambrian Guanshan Biota, Yunnan, China
    Autorzy:
    Chen, H.
    Legg, D.A.
    Zhai, D.-Y.
    Liu, Y.
    Hou, X.-G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082130.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Arthropoda
    Euarthropoda
    Fuxianhuiida
    Fuxianhuiidae
    Guanshan Biota
    Cambrian
    Asia
    Opis:
    The fuxianhuiid arthropod Guangweicaris spinatus, from the lower Cambrian (Series 2, Stage 4), Guanshan Biota (Wulongqing Member, Canglangpu Formation), located in the vicinity of Kunming (Yunnan Province, southwest China), is redescribed based on new specimens and a re-examination of previously described material. A more complete overview of its morphology is given. Newly recognised features include: (i) a medial cephalic bulge; (ii) a tripartite hypostome; (iii) a pair of specialized post-antennal appendage (SPA); (iv) a putative telson; (v) two pairs of spines on the posteroventral margin of the terminal abdominal segment. This information is used to provide an emended diagnosis of the family Fuxianhuiidae, and the genus Guangweicaris.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 1; 139-148
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Image compression-encryption algorithm combining compressive sensing with log operation
    Autorzy:
    Chen, R.-L.
    Zhou, Y.
    Luo, M.
    Zhang, A.-D.
    Gong, L.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/174009.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    image encryption
    image compression
    compressive sensing
    log operation
    Opis:
    Based on compressive sensing and log operation, a new image compression-encryption algorithm is proposed, which accomplishes encryption and compression simultaneously. The proposed image compression-encryption algorithm takes advantage of not only the physical realizability of partial Hadamard matrix, but also the resistance of the chosen-plaintext attack since all the elements in the partial Hadamard matrix are 1, –1 or log 1 = 0. The proposed algorithm is sensitive to the key and it can resist various common attacks. The simulation results verify the validity and reliability of the proposed image compression-encryption algorithm.
    Źródło:
    Optica Applicata; 2018, 48, 4; 563-573
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and Ontogenesis of a Marine Ciliate, Euplotes balteatus (Dujardin, 1841) Kahl, 1932 (Ciliophora, Euplotida) and Definition of Euplotes wilberti nov. spec.
    Autorzy:
    Pan, Ying
    Li, Liqiong
    Shao, Chen
    Hu, Xiaozhong
    Ma, Honggang
    Alrasheid, Khaled A. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/763622.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Euplotes balteatus, Euplotes wilberti nov. spec., marine ciliate, morphology, ontogenesis
    Opis:
    Euplotes balteatus (Dujardin, 1841) Kahl 1932, collected from coastal waters near Qingdao, northern China, was investigated using live observation and silver staining methods. An improved diagnosis and morphometric data are provided. Euplotes balteatus can be identified by the following combination of characters: 10 frontoventral cirri, 2 widely separated marginal cirri, 2 fine caudal cirri, 8 dorsal kineties and a double-eurystomus type silverline system. Its morphogenesis, which is similar to that of several congeners, can be summarized as follows: (1) the opisthe’s oral primordium appears de novo under the pellicle whereas the old oral apparatus is retained by the proter; (2) two groups of frontoventral transverse cirral anlagen, each with five streaks, occur de novo and then develop into the frontoventral and transverse cirri separately according to the formula of “3:3:3:3:2” from left to right; (3) the anlagen for the marginal cirri occur de novo near the parental oral apparatus; (4) migratory cirri of both dividers derive from the anlagen near the paroral membrane; (5) the dorsal kinety anlagen come from dedifferentiation of the parental structures in the mid-body region; (6) caudal cirri are formed at the posterior ends of the two rightmost dorsal kineties. In the light of the present findings, it was concluded that the Antarctic population of E. balteatus reported by Song and Wilbert (2002) was misidentified. A new species, Euplotes wilberti nov. spec., is established for this population.
    Źródło:
    Acta Protozoologica; 2012, 51, 1
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Focused Ion Beam Imaging of Defects in Multicrystalline Si for Photovoltaic Application
    Autorzy:
    Miyamura, Y.
    Sekiguchi, T.
    Chen, J.
    Li, J.
    Watanabe, K.
    Kumagai, K.
    Ogura, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1198415.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.-a
    61.85.+p
    61.72.Ff
    Opis:
    We demonstrate the imaging of the extended defects in Si materials using a focused ion beam instrument. Since Ga-ion beam has small penetration depth and high channeling character compared with electron beam, the secondary electron signal of focused ion beam is more sensitive to the surface morphology and crystallinity. We have tried to use this secondary electron imaging of focused ion beam for observation of various extended defects in Si materials for photovoltaic and semiconductor devices. As for the texture of multicrystalline Si, some grains are imaged darker than the others. It suggests that the crystal orientation gives different channeling effect on the primary Ga-ion beam, resulting in the different secondary electron yield. The grain boundaries and lineage in multicrystalline Si are shown as bright lines and patterns in the image. Although it may reflect the surface morphologies, these contrasts may be attributed to the channeling contrast due to lattice displacement or distortion. The contrast mechanism of FIB imaging is discussed.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 991-993
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XANES Study of La$\text{}_{0.75-x}$Gd$\text{}_{x}$Ca$\text{}_{0.25}$MnO$\text{}_{3-δ}$ Solid Solutions
    Autorzy:
    Drozd, V. A.
    Pęka̶a, M.
    Liu, R. S.
    Lee, J.-F.
    Chen, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046755.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    61.10.Ht
    Opis:
    A series of solid solutions La$\text{}_{0. 75-x}$Gd$\text{}_{x}$Ca$\text{}_{0.25}$MnO$\text{}_{3-δ}$ with 0.0≤x≤0.75 was prepared via carbonate precursor precipitation method. Final sintering was performed at 1250ºC in oxygen flow atmosphere. The samples obtained were characterized by scanning electron microscope, X-ray diffraction measurements. Oxygen stoichiometry was analyzed by iodometric titration method. X-ray absorption spectroscopic methods of Mn L-edge and Mn K-edge X-ray absorption near edge structure were used to study oxidation state of manganese in the solid solutions and elucidate features of their local crystal structure. Orthorhombic crystal structure characteristics of the solid solutions were refined by Rietveld method. An increase in oxygen deficiency and average manganese oxidation state were found to accompany Gd concentration increase in La$\text{}_{0.75-x}$Gd$\text{}_{x}$Ca$\text{}_{0.25}$MnO$\text{}_{3-δ}$. These results are consistent with Mn L-edge X-ray absorption near edge structure spectra, where a gradual change of Mn oxidation state with Gd concentration increase was detected. Origins of oxygen deficiency La$\text{}_{0.75- x}$Gd$\text{}_{x}$Ca$\text{}_{0.25}$MnO$\text{}_{3-δ}$ are discussed in terms of structural disorder caused by Gd substitution for La.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 583-589
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mouldability and its Recovery Properties of 2D Plain Woven Para-Aramid Fabric for Soft Body Armour Applications
    Formowalność i odprężenie elastyczne tkaniny p-aramidowej 2D stosowanej w miękkich pancerzach
    Autorzy:
    Abtew, Mulat A.
    Loghin, Carment
    Cristian, Irina
    Boussu, François
    Bruniaux, Pascal
    Chen, Yan
    Wang, Lichuan
    Powiązania:
    https://bibliotekanauki.pl/articles/233652.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    mouldability
    moulding recovery
    woven para-aramid fabric
    fabric layers
    soft body armour
    formowalność
    odzyskiwanie form
    tkanina para-aramidowa
    warstwy tkaniny
    pancerz
    Opis:
    Mouldability, along with other mechanical properties, is a very crucial material parameter in various technical textile applications, from composites to soft body armour products. Moreover, the mouldability and recovery behaviours of the material will be affected by various internal and external paramters before, during and after the forming process. The current research particularly tried to study the effects of blank-holder pressure (BHP) and the number of layers not only on the moulding characterstics but also on the recovery behaviour of plain woven p-aramid fabrics made from a high-performance yarn with a linear density of 930 dTex. Samples with various numbers of layers were arranged in the same orientation for the moulding process. The moulding approach utilised a specific moulding device in a low-speed forming process and a predefined semi-hemispherically shaped punch for all specimens.Various important dry textile material moulding characteristics and, most importantly, the moulding recovery properties, such as warp and weft direction drawing-in recovery, center high-point recovery, shear angle recovery etc. were investigated.
    Formowalność wraz z innymi właściwościami mechanicznymi jest bardzo ważnym parametrem materiałowym w różnych technicznych zastosowaniach tekstylnych, od kompozytów po miękkie pancerze. Ponadto na formowalność i odprężenie elastyczne materiału mają wpływ różne parametry wewnętrzne i zewnętrzne przed, podczas i po procesie formowania. W pracy szczególnie starano się zbadać wpływ nacisku ślepej próby (BHP) i liczby warstw nie tylko na charakterystykę formowania, ale także na odprężenie elastyczne tkanin p-aramidowych wykonanych z wysokowydajnej przędzy o gęstości liniowej 930 dTex. Próbki o różnej liczbie warstw ułożono w tej samej orientacji do procesu formowania. Zbadano cechy formowania materiału tekstylnego oraz, co najważniejsze, odprężenie elastyczne zarówno w kierunku osnowy i wątku.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2019, 6 (138); 54-62
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An application of feedback linearization to the tracking and almost disturbance decoupling control of nonlinear system with uncertainties
    Autorzy:
    Chen, C.-C.
    Huang, Y.-C
    Lin, W.-J.
    Shen, D.-C.
    Huang, L.-A.
    Powiązania:
    https://bibliotekanauki.pl/articles/970382.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    almost disturbance decoupling
    feedback linearizable
    differential geometry approach
    composite Lyapunov approach
    Opis:
    This paper studies the tracking and almost disturbance decoupling problem of nonlinear systems with uncertainties, based on the feedback linearization approach. The main contribution of this study is to construct a controller, under appropriate conditions, such that the resulting closed-loop system is valid for any initial condition and bounded tracking signal with the following characteristics: input-to-state stability with respect to disturbance inputs and almost disturbance decoupling, i.e., the influence of disturbances on the L2 norm of the output tracking error can be arbitrarily attenuated by changing some adjustable parameters. Two examples, which cannot be solved by the first paper on the almost disturbance decoupling problem, are proposed in this paper to exploit the fact that the tracking and the almost disturbance decoupling performances are easily achieved by the proposed approach. In order to demonstrate the practical applicability, the paper has investigated the AMIRA ball and beam system.
    Źródło:
    Control and Cybernetics; 2007, 36, 2; 385-403
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular characterisation of Bulinus snails - intermediate hosts of schistosomes in Ogun State, south-western Nigeria
    Autorzy:
    Akinwale, O.
    Oso, O.
    Salawu, O.
    Odaibo, A.
    Tang, P.
    Chen, T.-W.
    Gyang, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/84247.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Tematy:
    molecular characteristics
    Bulinus
    species identification
    snail
    host
    intermediate host
    schistosome
    rRNA gene
    schistosomiasis
    Ogun State
    Nigeria
    Źródło:
    Folia Malacologica; 2015, 23, 2
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconducting Pinning by Magnetic Domains in a Ferromagnet-Superconductor Bilayer
    Autorzy:
    Cieplak, M. Z.
    Adamus, Z.
    Konczykowski, M.
    Chen, X. M.
    Byczuk, A.
    Abal'oshev, A.
    Sang, Hai.
    Chien, C. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041450.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.25.Qt
    74.78.Db
    74.78.Fk
    Opis:
    The local flux profile and the critical current are studied using an array of Hall sensors in a ferromagnetic-superconducting bilayer which consists of niobium film covering ferromagnetic Co/Pt multilayer with perpendicular magnetic anisotropy. The results indicate about threefold enhancement of the flux pinning in niobium layer caused by the isolated magnetic domains which are created during the magnetization reversal of the Co/Pt multilayer. The geometrical barrier is absent, and the critical current is strongly peaked in close vicinity to the sample center, suggesting that the critical state differs from that predicted by the Bean model.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 693-698
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Redescriptions of two Marine Scuticociliates from China, with notes on Stomatogenesis in Parauronema longum (Ciliophora, Scuticociliatida)
    Autorzy:
    Pan, Xuming
    Shao, Chen
    Ma, Honggang
    Fan, Xinpeng
    Al-Rasheid, Khaled A. S.
    Al-Farraj, Saleh A.
    Hu, Xiaozhong
    Powiązania:
    https://bibliotekanauki.pl/articles/763650.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Scuticociliates, infraciliature, marine ciliates, morphogenesis, Parauronema, Pleuronema
    Opis:
    The morphology and infraciliature of two marine scuticociliates, Pleuronema puytoraci Grolière and Detcheva, 1974, and Parauronema longum Song, 1995, collected from China, were investigated using live observation and protargol impregnation methods. Based on the data obtained for the China population, new information of the living morphology of Pleuronema puytoraci is documented and details of the complete infraciliature is available for the first time. The stomatogenesis of Parauronema longum is basically similar to that of its congeners and can be summarized as follows: membranelle 1, membranelle 2 and the scutica of the opisthe originate from the parental paroral membrane, whereas membranelle 3 of the opisthe develops from the parental scutica; the paroral membrane originates from the parental paroral membrane.
    Źródło:
    Acta Protozoologica; 2011, 50, 4
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Small-for-gestational age prevalence risk factors in central Appalachian states with mountain-top mining
    Autorzy:
    Ferdosi, Hamid
    Lamm, Steve H.
    Afari-Dwamena, Nana A.
    Dissen, Elisabeth
    Chen, Rusan
    Li, Ji
    Feinleib, Manning
    Powiązania:
    https://bibliotekanauki.pl/articles/2161794.pdf
    Data publikacji:
    2017-10-18
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    tobacco
    mining
    maternal smoking
    small for gestational age
    mountain-top mining
    SGA prevalence
    Opis:
    Objectives: To identify risk factors for small-for-gestational age (SGA) for counties in central Appalachian states (Kentucky (KY), Tennessee (TN), Virginia (VA), and West Virginia (WV)) with varied coal mining activities. Material and Methods: Live birth certificate files (1990–2002) were used for obtaining SGA prevalence rates for mothers based on the coal mining activities of their counties of residence, mountain-top mining (MTM) activities, underground mining activities but no mountain-top mining activity (non-MTM), or having no mining activities (non-mining). Co-variable information, including maternal tobacco use, was also obtained from the live birth certificate. Adjusted odds ratios were obtained using multivariable logistic regression comparing SGA prevalence rates for counties with coal mining activities to those without coal mining activities and comparing SGA prevalence rates for counties with coal mining activities for those with and without mountain-top mining activities. Comparisons were also made among those who had reported tobacco use and those who had not. Results: Both tobacco use prevalence and SGA prevalence were significantly greater for mining counties than for non-mining counties and for MTM counties than for non-MTM counties. Adjustment for tobacco use alone explained 50% of the increased SGA risk for mining counties and 75% of the risk for MTM counties, including demographic pre-natal care co-variables that explained 75% of the increased SGA risk for mining counties and 100% of the risk for MTM. The increased risk of SGA was limited to the third trimester births among tobacco users and independent of the mining activities of their counties of residence. Conclusions: This study demonstrates that the increased prevalence of SGA among residents of counties with mining activity was primarily explained by the differences in maternal tobacco use prevalence, an effect that itself was gestational-age dependent. Self-reported tobacco use marked the population at the increased risk for SGA in central Appalachian states. Int J Occup Med Environ Health 2018;31(1):11–23
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2018, 31, 1; 11-23
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Transport and Microwave Noise in MBE- and MOCVD-Grown AlGaN/AlN/GaN
    Autorzy:
    Matulionis, A.
    Liberis, J.
    Eastman, L. F.
    Schaff, W. J.
    Shealy, J. R.
    Chen, X.
    Sun, Y. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041771.pdf
    Data publikacji:
    2005-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kr
    72.20.Ht
    73.40.Kp
    Opis:
    Microwave noise temperature, current, and dissipated power were investigated at room temperature in undoped AlGaN/AlN/GaN channels grown by molecular beam epitaxy and metal-organic compound vapour decomposition techniques. Samples with essentially the same electron density (1×10$\text{}^{13}$ cm$\text{}^{-2}$) and low-field mobility (1150 cm$\text{}^{2}$/(V s)) demonstrated considerably different behaviour at high electric fields. The effective hot-phonon lifetime, 300 fs and 1000 fs, respectively, was estimated for molecular beam epitaxy and metal-organic compound vapour decomposition samples. The expected anti-correlation of hot-phonon lifetime and hot-electron drift velocity was confirmed experimentally.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 2; 361-364
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence of Highly Excited Nonpolar a-Plane GaN and AlGaN/GaN Multiple Quantum Wells
    Autorzy:
    Juršėnas, S.
    Kuokštis, E.
    Miasojedovas, S.
    Kurilčik, G.
    Žukauskas, A.
    Chen, C. Q.
    Yang, J. W.
    Adivarahan, V.
    Asif Khan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038100.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    73.21.Fg
    72.20.Jv
    78.47.+p
    Opis:
    Carrier recombination dynamics in polar and nonpolar GaN epilayers and GaN/AlGaN multiple quantum wells grown over sapphire substrates with various crystallographic orientation were studied under high photoexcitation by 20 ps laser pulses. The transient of luminescence featured a significant enhancement in nonradiative recombination of free carriers for nonpolar a-plane GaN epilayers compared to conventional c-plane samples. The epitaxial lateral overgrowth technique was demonstrated to significantly improve the quality of nonpolar a-plane films. This was proved by more than 40-fold increase in luminescence decay time (430 ps compared to ≤10 ps in the ordinary a-plane epilayer). Under high-excitation regime, a complete screening of built-in electric field by free carriers in multiple quantum wells grown on c-plane and r-plane sapphire substrates was achieved. Under such high excitation, luminescence efficiency and carrier lifetime of multiple quantum wells was shown to be determined by the substrate quality.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 567-573
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Opracowanie i walidacja skuteczności produktów fermentowanych na bazie Bacillus jako alternatywy dla antybiotyków u zwierząt domowych
    Autorzy:
    Cheng, Y.-H.
    Horng, Y.-B.
    Chen, W.-J.
    Hua, K.-F.
    Dybus, A.
    Hsiao, F.S.-H.
    Yu, Y.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/3136350.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    domestic animal
    antibiotics alternative
    Bacillus-based fermented products
    validation
    efficacy
    Źródło:
    Acta Scientiarum Polonorum. Zootechnica; 2021, 20, 3; 23-34
    1644-0714
    Pojawia się w:
    Acta Scientiarum Polonorum. Zootechnica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comprehensive surveillance of the antibody response to Borrelia burgdorferi s.l. in small ruminants in China
    Autorzy:
    Yang, J.
    Liu, Z.
    Guan, G.
    Li, Y.
    Chen, Z.
    Ma, M.
    Liu, A.
    Ren, Q.
    Wang, J.
    Luo, J.
    Yin, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/49708.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2015, 22, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence of Highly Photoexcited GaN Epilayers and Heterostructures Grown on Different Sapphire Crystal Planes
    Autorzy:
    Juršėnas, S.
    Miasojedovas, S.
    Kurilčik, G.
    Liuolia, V.
    Žukauskas, A.
    Chen, C. Q.
    Yang, J. W.
    Kuokštis, E.
    Adivarahan, V.
    Asif Khan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041736.pdf
    Data publikacji:
    2005-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    73.21.Fg
    72.20.Jv
    78.47.+p
    Opis:
    GaN epilayers and AlGaN/GaN multiple quantum wells grown by metalorganic chemical vapor deposition on different crystal planes (c, a, and r) of the sapphire substrate were studied by excitation intensity dependent and time-resolved photoluminescence. In polar multiple quantum wells grown on a- and c-planes, a blueshift of the luminescence band with increasing the excitation energy was observed, indicating that screening of built-in field by free carriers takes place, whereas in nonpolar r-plane grown multiple quantum wells, the luminescence band maintained an almost constant peak position. Full screening of built-in field was achieved at the excitation densities higher than 0.3 mJ/cm$\text{}^{2}$. Under conditions of screened built-in electric field the structures were characterized by carrier lifetime. It was shown that nonpolar multiple quantum wells suffer from high density of nonradiative traps that can be due to substrate related threading dislocations.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 2; 235-239
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A regional comparison of children’s blood cadmium, lead, and mercury in rural, urban and industrial areas of six European countries, and China, Ecuador, and Morocco
    Autorzy:
    Hrubá, Františka
    Černá, Milena
    Chen, Chunying
    Harari, Florencia
    Horvat, Milena
    Koppová, Kvetoslava
    Krsková, Andrea
    Laamech, Jawhar
    Li, Yu-Feng
    Löfmark, Lina
    Lundh, Thomas
    Lyoussi, Badiaa
    Mazej, Darja
    Osredkar, Joško
    Pawlas, Krystyna
    Pawlas, Natalia
    Prokopowicz, Adam
    Rentschler, Gerda
    Snoj Tratnik, Janja
    Sommar, Johan
    Spěváčková, Věra
    Špirić, Zdravko
    Skerfving, Staffan
    Bergdahl, Ingvar A.
    Powiązania:
    https://bibliotekanauki.pl/articles/21375677.pdf
    Data publikacji:
    2023-09-07
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    biological monitoring
    child
    mercury
    lead
    environmental pollutants
    cadmium
    Opis:
    Objectives The authors aimed to evaluate whether blood cadmium (B-Cd), lead (B-Pb) and mercury (B-Hg) in children differ regionally in 9 countries, and to identify factors correlating with exposure. Material and Methods The authors performed a cross-sectional study of children aged 7–14 years, living in 2007–2008 in urban, rural, or potentially polluted (“hot spot”) areas (ca. 50 children from each area, in total 1363 children) in 6 European and 3 non-European countries. The authors analysed Cd, Pb, and total Hg in blood and collected information on potential determinants of exposure through questionnaires. Regional differences in exposure levels were assessed within each country. Results Children living near industrial “hot-spots” had B-Cd 1.6 (95% CI: 1.4–1.9) times higher in the Czech Republic and 2.1 (95% CI:1.6–2.8) times higher in Poland, as compared to urban children in the same countries (geometric means [GM]: 0.13 μg/l and 0.15 μg/l, respectively). Correspondingly, B-Pb in the “hot spot” areas was 1.8 (95% CI: 1.6–2.1) times higher than in urban areas in Slovakia and 2.3 (95% CI: 1.9–2.7) times higher in Poland (urban GM: 19.4 μg/l and 16.3 μg/l, respectively). In China and Morocco, rural children had significantly lower B-Pb than urban ones (urban GM: 64 μg/l and 71 μg/l, respectively), suggesting urban exposure from leaded petrol, water pipes and/or coal-burning. Hg “hot spot” areas in China had B-Hg 3.1 (95% CI: 2.7–3.5) times higher, and Ecuador 1.5 (95% CI: 1.2–1.9) times higher, as compared to urban areas (urban GM: 2.45 μg/l and 3.23 μg/l, respectively). Besides industrial exposure, traffic correlated with B-Cd; male sex, environmental tobacco smoke, and offal consumption with B-Pb; and fish consumption and amalgam fillings with B-Hg. However, these correlations could only marginally explain regional differences. Conclusions These mainly European results indicate that some children experience about doubled exposures to toxic elements just because of where they live. These exposures are unsafe, identifiable, and preventable and therefore call for preventive actions.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2023, 36, 3; 349-364
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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