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    Wyświetlanie 1-60 z 60
    Tytuł:
    Regional geographies of land transport networks in the Pearl River Delta mega-region, China: A longitudinal analysis
    Autorzy:
    Gao, X.
    Li, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2140889.pdf
    Data publikacji:
    2018
    Wydawca:
    Fundacja Centrum Badań Socjologicznych
    Tematy:
    transport network
    network efficiency
    spatiotemporal evolution
    Pearl River Delta
    PRD
    Opis:
    This paper uses network-based efficiency measures to evaluate the efficiency implications of the evolution of the transport network in the Pearl River Delta (PRD) over the period 1988-2008. The network-based efficiency measures consider the relative ease of access between cities in terms of weighted relative travel cost. The results indicate that the spatial patterns of network efficiency are different from ‘core-periphery’ pattern derived from classical accessibility indicators. This implies that there are low network efficiency cities and high network efficiency cities in core and peripheral regions at the same time. In the first stage (1988-1998), the efficiency contour shows a ‘corridor’ pattern along the GuangShen traffic corridor between Guangzhou and Shenzhen in the eastern side of the Pearl estuary; in the following decade (1998-2008), with large-scale infrastructural developments, the spatial pattern has changed from a north-south corridor to an east-west contiguous distribution pattern. By 2008, the mean network efficiency value indicates that the efficiency levels within the PRD as a whole are tending towards optimal levels. We conclude by suggesting ways to promote the urban economic development based on the relationship between the network efficiency and per capita GDP.
    Źródło:
    Journal of Sustainable Development of Transport and Logistics; 2018, 3, 1; 37-52
    2520-2979
    Pojawia się w:
    Journal of Sustainable Development of Transport and Logistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship trajectory tracking control system design based on sliding mode control algorithm
    Autorzy:
    Liu, Y.
    Bu, R.
    Gao, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/259621.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    LOS
    ship trajectory
    tracking control system
    sliding mode control
    Opis:
    The paper reports the design and tests of the planar autopilot navigation system in the three-degree-of-freedom (3-DOF) plane (surge, sway and yaw) for a ship. The aim of the tests was to check the improved maneuverability of the ship in open waters using the improved nonlinear control algorithm, developed based on the sliding mode control theory for the ship-trajectory tracking problem of under-actuated ships with static constraints, actuator saturation, and parametric uncertainties. With the integration of the simple increment feedback control law, the dynamic control strategy was developed to fulfill the under-actuated tracking and stabilization objectives. In addition, the LOS (line of sight) guidance system was applied to control the motion path, whereas the sliding mode controller was used to emulate the rudder angle and propeller rotational speed control. Firstly, simulation tests were performed to verify the validity of the basic model and the tracking control algorithm. Subsequently, full scale maneuverability tests were done with a novel container ship, equipped with trajectory tracking control and sliding mode controller algorithm, to check the dynamic stability performance of the ship. The results of the theoretical and numerical simulation on a training ship verify the invariability and excellent robustness of the proposed controller, which: effectively eliminates system chattering, solves the problem of lateral drift of the ship, and maintains the following of the trajectory while simultaneously achieving global stability and robustness.
    Źródło:
    Polish Maritime Research; 2018, 3; 26-34
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship Behavior Analysis for Real Operating of Container Ships Using AIS Data
    Autorzy:
    Gao, X.
    Makino, H.
    Furusho, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/116131.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Automatic Identification System (AIS)
    AIS Data
    Container Ship
    Real Operating of Container Ships
    Opis:
    The aim of this paper is to understand the real activity and operating situation of container ships in order to improve navigation efficiency. The study focused on the navigation for an entire ship voyage to understand the real activity of container ships using the historical ship navigation based on Automatic Identification System (AIS) data, which is possible so as to unveil the characteristics of real ship activity. The analysis considers ship voyages in the Seto Inland Sea and its oceanic waters, which are the primary traffic routes for container transportation particularly for China, Japan, and South Korea. The results of this study can be used to improve the efficiency of container ships and develop a smoother maritime transportation.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 2; 213-220
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear inverse solution by the look-up table method for Risley-prism-based scanner
    Autorzy:
    Li, A.
    Sun, W.
    Gao, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/173899.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    risley prism
    lookup table method
    inverse solution
    scanner
    Opis:
    A pair of rotation Risley prisms can perform superior optical pointing and tracking functions with large visual field and high accuracy. Crucial to the function implementation are the nonlinear inverse solutions to the double-prism orientation angles for tracking a given target trajectory. In the paper, a novel look-up table method is proposed to solve this problem. Because there are two groups of solutions to the rotation angles achieved from an arbitrary target point, a "jump" phenomenon occurs and generates the discontinuous curves of multi-group rotation angle solutions. According to the mapping relation between the coordinate values of the target point and the corresponding rotation angles of two prisms, we can establish the continuous solution curves by adding constraints and employing an optimization algorithm. Experimental results validate the obtained inverse solutions applicable to scan a trajectory close to the given one within an error threshold. The proposed look-up table method can provide foundation for the continuous control of the Risley-prism-based scanner in its inverse applications.Keywords: Risley prism, look-up table method, inverse solution, scanner.
    Źródło:
    Optica Applicata; 2016, 46, 4; 501-515
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Creep Properties of Nonwoven Fabric with Mechanical Models
    Analiza właściwości pełzania włóknin z zastosowaniem modelu mechanicznego
    Autorzy:
    Gao, X.
    Chen, H.
    Sun, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/231630.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    nonwoven fabric
    viscoelasticity
    creep
    mechanical model
    nonlinear regression
    włókniny i geowłókniny
    lepkosprężystość
    właściwości pełzania
    model mechaniczny
    regresja nieliniowa
    Opis:
    Since nonwoven fabric is widely used in the application of high performance geotextiles, its creep behaviour is essential to be evaluated. In this paper, the creep response of nonwven fabric was studied by using four mechanical models including the one-term generalised Kelvin model, Burger’s model, two-term generalised Kelvin model and Zurek’s model. To verify the feasibility of the models, creep experiments for nonwoven fabric were conducted, and the data were fitted by the four models, respectively, to obtain their parameter values using the Marquardt algorithm for nonlinear regression. When comparing the experimental creep curves with those fitted from the mechanical models, it is obvious that the experimental data was best fitted by Burger’s model. Also, since the residual sum of squares is far less than that of the GK (n = 1) and GK (n = 2) model and the squares of the correlation coefficient are near to unity, it can be concluded that Burger’s model is suitable to describe the creep behaviour of nonwoven fabric. Therefore the viscoelastic model verified can be adopted to predict the creep elongation of nonwoven fabrics.
    W artykule zaprezentowano możliwość zastosowania modeli reologicznych do modelowania zjawiska pełzania włóknin. Włókniny i geowłókniny znajdują szerokie zastosowanie w inżynierii lądowej. Zjawiska jakie zachodzą podczas użytkowania geowłóknin są złożone. Jednym ze zjawisk pojawiających się podczas użytkowania jest poddawanie włókniny i geowłókniny stałym napięciom wynikającym ze zjawiska pełzania. Zastosowano trzy rodzaje modeli reologicznych w oparciu o modele Kelvina, Burgersa i uogólnionego modelu Kelvina. Wygenerowane modele teoretyczne zostały utworzone w celu przewidywania zjawiska pełzania. Adekwatność modeli reologicznych przeprowadzono w oparciu o metodę najmniejszych kwadratów dla estymacji parametrów w nieliniowych modelach regresji Levenberga - Marquardta. Zastosowano modele, które można dopasowywać przy pomocy estymacji metodą najmniejszych kwadratów dowolnej funkcji straty określonej przez użytkownika. Zastosowano funkcję straty do wyboru procedury estymacji, tak że praktycznie we wszystkich przypadkach otrzymano stabilne oceny parametrów modeli. Najlepsze efekty otrzymano przy zastosowaniu modelu Burgersa, który to może być użyty do przewidywania pełzania włókniny w obiektach inżynierskich.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2015, 1 (109); 72-76
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Twist Structure in Self-twist Yarn
    Analiza struktury skrętu w przędzy samo-skrętnej
    Autorzy:
    Cui, H.
    Gao, X.
    Gao, D.
    Lin, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/234416.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    self-twist
    twist distribution
    in-phase
    phased
    twist roller
    struktura skrętu
    przędza samoskrętna
    Opis:
    This paper mainly discussed the twist structure and property difference between in-phase self-twist yarn and phased self-twist yarn. There are three kinds of zones along the yarn: the twist-twist zone, twist-notwist zone and notwist-notwist zone in one cycle length of self-twist yarn. The existence of the phase difference makes the length of the notwist-notwist zone decrease. When the size of the phase difference (value c)is closer to or equal to the length of the zero zone(value b), the minimum length of the notwist-notwist zone will be obtained so that the best properties of self-0twist yarn can be achieved. The result for in-phase and phased self-twist yarn shows that the above conclusion is correct.
    W artykule omówiono strukturę skrętu i właściwości przędz samo-skrętnych. W przędzach samo-skrętnych istnieje strefa o zazwyczaj słabym skręcie pomiędzy strefami włókien skręconych i nieskręconych. Istnienie różnicy faz w różnych typach przędz samo-skrętnych powoduje zmniejszenie długości strefy włókien nieskręconych. Minimalna długość tej strefy zostanie osiągnięta, gdy wielkość różnicy faz jest większa lub równa długości strefy zerowej, pozwala to na osiągnięcie jak najlepszych właściwości przędz samo-skrętnych.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 2 (122); 53-56
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Numerical Simulation of the Tensile Behaviour of a Biaxial Warp-knitted Composite
    Eksperymentalna i numeryczna symulacja rozciągania kompozytów wzmocnionych dwuosiową dzianiną osnowową
    Autorzy:
    Gao, X.
    Yang, X.
    Li, D.
    Li, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/233474.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    biaxial warp-knitted composite
    tensile behavior
    finite element analysis
    dwuosiowy kompozyt z osnową
    zachowanie na rozciąganie
    analiza elementów skończonych
    Opis:
    In this paper a composite reinforced with biaxial warp-knitted fabric and epoxy resin was manufactured by applying vacuum assisted resin transfer moldings (VARTM). The quasi-static tensile behaviour was experimentally tested in 0° and 90° directions, respectively. A finite element model of biaxial warp-knitted composites was developed on a meso-scale. The tensile behaviour of the composites was numerical simulated and compared with the experimental results. It showed that there is an approximate agreement between experimental and numerical results. There are maximum errors sum of squares of 14.52% and 33.29%. The finite element model of biaxial warp-knitted composites has higher accuracy, which can be used to study the static and dynamic mechanical properties.
    Wykonano kompozyt wzmocniony dwuosiową dzianiną osnowową i żywicą epoksydową z zastosowaniem próżniowego przenoszenia żywicy (VARTM). Quasi-statyczne właściwości rozciągania badano doświadczalnie odpowiednio w kierunkach 0° i 90°. Opracowano model skończonych elementów dwuosiowych kompozytów z dzianinami. Dokonano symulacji numerycznej zachowania kompozytów podczas rozciągania, a następnie porównano wyniki teoretyczne z wynikami eksperymentalnymi. Wykazano, że istnieje przybliżona zgodność między wynikami eksperymentalnymi i liczbowymi. Stwierdzono, że błędy maksymalne błędy kształtują się na poziomie 14,52% i 33,29%. Zaprezentowany model elementów skończonych ma wysoką dokładność i można go wykorzystać do badania statycznych i dynamicznych właściwości mechanicznych kompozytów.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2018, 6 (132); 71-76
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antibiotics in WWTP discharge into the Chaobai River, Beijing
    Autorzy:
    Zhang, C.
    Wang, L.
    Gao, X.
    He, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/204951.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    antibiotics
    PPCPs
    pharmaceuticals and personal care products
    WWTP
    wastewater treatment plant
    BAF
    biological aerated filter
    advanced treatment
    Opis:
    22 representative antibiotics, including 8 quinolones (QNs), 9 sulfonamides (SAs), and 5 macrolides (MCs) were selected to investigate their occurrence and removal efficiencies in a Wastewater Treatment Plant (WWTP) and their distribution in the receiving water of the Chaobai River in Beijing, China. Water quality monitoring was performed in an integrated way at different selected points in the WWTP to explore the potential mechanism of antibiotics removal during wastewater treatment. Water quality of the Chaobai River wa s also analyzed to examine environmental distribution in a river ecosystem. The results showed that within all the 22 compounds examined, 10 antibiotics were quantifi ed in wastewater influent, 10 in effluent, and 7 in river. Sulfadiazine (SDZ, 396 ng/L) and Sulfamethazine (SMZ, 382 ng/L) were the dominating antibiotics in the influent. Both the conventional treatment and advanced Biological Aerated Filter (BAF) system was important for the removal of antibiotics from the wastewater. And the concentrations of selected antibiotics were ranged from 0–41.8 ng/L in the effluent-receiving river. Despite the fact that the concentrations were reduced more than 50% compared to effluent concentrations, WWTP discharge was still regarded as a dominant point-source input of antibiotics into the Chaobai River.
    Źródło:
    Archives of Environmental Protection; 2016, 42, 4; 48-57
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Preparation of Soluble Cellouronic Acid Sodium Salt by 4-Acetamide-TEMPO Mediated Oxidation of Ultrasound-Pretreated Parenchyma Cellulose from Bagasse Pith
    Autorzy:
    Gao, X.
    Chen, K.
    Zhang, H.
    Peng, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/177150.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultrasonic pretreatment
    bagasse pith
    parenchyma cellulose
    cellouronic acid sodium salt
    4-acetamide-TEMPO
    Opis:
    The parenchyma cellulose isolated from bagasse pith was used as an alternative resource for preparation of water-soluble cellouronic acid sodium salt (CAS). The influence of ultrasound treatment on the cellulose was investigated for obtaining CAS by regioselective oxidization using 4-acetamide-TEMPO and NaClO with NaClO2 as a primary oxidant in an aqueous buffer at pH 6.0. The yield, carboxylate content and polymerization degree (DP) of CAS were measured as a function of ultrasonic power, agitating time and cellulose consistency by an orthogonal test. The ultrasound-treated conditions were further improved by discussion of ultrasonic power, the most important factor influencing the yield and DP. An optimized CAS yield of 72.9% with DP value (DPv) of 212 was found when the ultrasonic strength is 550 W, agitating time is 3 h and cellulose consistency is 2.0%. The oxidation reactivity of cellulose was improved by ultrasonic irradiation, whereas no significant changes in crystallinity of cellulose were measured after ultrasonic treatment. Moreover, the ultrasound treatment has a greater effect on yielding CAS from parenchyma cellulose than from bagasse fibrous’ one. The CAS was further characterized by Fourier transform infrared spectroscopy (FT-IR) and Scanning electron microscopy (SEM).
    Źródło:
    Archives of Acoustics; 2014, 39, 2; 267-275
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrothermal Synthesis and Microstructural, Optical Properties Characterization of $YVO_4$ Phosphor Powder
    Autorzy:
    Zhang, S.
    Liang, Y.
    Gao, X.
    Liu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207386.pdf
    Data publikacji:
    2014-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.-m
    42.70.Hj
    78.67.-n
    Opis:
    The phonon energy of $YVO_4$ crystal is lower than other usual compounds of salt. So it is suitable as host material for down-conversion materials. Hydrothermal method was adopted to synthesize $YVO_4$ phosphor powder with the use of yttrium oxide and sodium vanadate as raw material. The change in the relative integral intensity of the (200) and (112) diffraction peaks indicates that macroscopic stress in the lattice obviously changes with the elevated hydrothermal reaction temperature. The $YVO_4$ phosphor powder synthesized involves a certain agglomeration of small particles. The phonon vibration in the $YVO_4$ originates mainly from the internal vibrations in the vanadium-oxygen tetrahedron, in addition to the Y-O and O-H vibrations. Due to a low phonon energy of only $2.8188 × 10^{-21} J$, $YVO_4$ helps to improve the down-conversion efficiency of rare-earth ions. A bandgap value of approximately 3.8 eV for the synthesized $YVO_4$ powders leads to good absorption properties in the ultraviolet region. Upon excitation by the 320 nm ultraviolet photon, the intrinsic emission of $YVO_4$ powders is annihilated, and a broadband emission of $VO_4^{3-}$ near 450 nm is observed at room temperature. The $YVO_4$ phosphor powder synthesized at 180C exhibits the maximum photoluminescence intensity because of its excellent crystallization.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 1; 105-110
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Horse - Expert: an aided expert system for diagnosing horse diseases
    Autorzy:
    Qin, H.
    Xiao, J.
    Gao, X.
    Wang, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/31506.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    In contrast to the rapid development of the horse husbandry in China, the ability of horse veterinarians to diagnose diseases has not been improved and only a few domain experts have considerable expertise. At present, many expert systems have been developed for diseases diagnosis, but few for horse diseases diagnosis have been studied in depth. This paper presents the design and development of a computer-aided expert system for diagnosing horse diseases. We suggest an approach for diagnosis of horse diseases based on the analysis of diagnostic characteristics and the experiential knowledge of domain experts. It is based on using evidence-weighted uncertainty reasoning theory, which is a combination of evidence theory and an uncertainty pass algorithm of confidence factors. It enables drawing of inferences with atypical clinical signs and the uncertainty of the user’s subjective understanding. It reduces the influence of subjective factors on diagnostic accuracy. The system utilizes a user friendly interface for users and requests a confidence factor from users when feedback is given to the system. Horse-Expert combines the confidence factors with weight factors assigned to clinical signs by experts during the knowledge acquisition process to make diagnostic conclusions. The system can diagnose 91 common horse diseases, and provides suggestions for appropriate treatment options. In addition, users can check the medical record through statistical charts. The system has been tested in seven demonstration areas of Xinjiang province in northwestern China. By constantly maintaining and updating the knowledge base, the system has potential application in veterinary practice.
    Źródło:
    Polish Journal of Veterinary Sciences; 2016, 19, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent progress in monoaromatic pollutants removal from groundwater through bioremediation
    Autorzy:
    Chen, J.
    Gao, X.
    Yan, L.
    Xu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/11447.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    monoaromatic pollutant
    ground water
    bioremediation
    biodegradation
    benzene
    toluene
    ethylbenzene
    xylene
    Opis:
    Monoaromatic pollutants such as benzene, toluene, ethylbenzene and mixture of xylenes are now considered as widespread contaminants of groundwater. In situ bioremediation under natural attenuation or enhanced remediation has been successfully used for removal of organic pollutants, including monoaromatic compounds, from groundwater. Results published indicate that in some sites, intrinsic bioremediation can reduce the monoaromatic compounds content of contaminated water to reach standard levels of potable water. However, engineering bioremediation is faster and more efficient. Also, studies have shown that enhanced anaerobic bioremediation can be applied for many BTEX contaminated groundwaters, as it is simple, applicable and economical.This paper reviews microbiology and metabolism of monoaromatic biodegradation and in situ bioremediation for BTEX removal from groundwater under aerobic and anaerobic conditions. It also discusses the factors affecting and limiting bioremediation processes and interactions between monoaromatic pollutants and other compounds during the remediation processes.
    Źródło:
    International Letters of Natural Sciences; 2015, 07
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tensile-tensile Fatigue Behavior of Multi-axial Warp-knitted Reinforced Composite
    Ocena właściwości mechanicznych i zmęczeniowych kompozytowych dzianin wieloosiowych
    Autorzy:
    Gao, X.
    Tao, N.
    Chen, S.
    Wang, L.
    Wu, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/232142.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    multi-axial warp-knitted fabric composite
    fatigue behavior
    S-N curve
    equivalent residual strength
    kompozytowe dzianiny wieloosiowe
    zmęczenie materiału
    krzywa S-N
    równoważna wytrzymałość resztkowa
    Opis:
    An experimental study was carried out on the fatigue behaviour of multi-axial warp-knitted fabric composites. Composite samples reinforced with multi-axial warp-knitted fabric/matrix were manufactured by the vacuum-assisted resin transfer moulding method. Tensile-tensile fatigue cycling was carried out at different load levels, and S-N curves, tensile stress-strain curve and stiffness degradation of the multi-axial composite samples were obtained. Finally post-fatigue tensile tests were done at a stress level of 75%, at the stages of 1/3N and 2/3N, and the equivalent residual strength and stiffness degradation were obtained.
    Dokonano oceny właściwości mechanicznych i zmęczeniowych kompozytowych dzianin wieloosiowych. Kompozyty wzmocnione dzianiną wieloosiową wytworzono przy zastosowaniu próżniowej metody formowania. Dokonano oceny zmęczenia materiału i właściwości wytrzymałościowych przy różnych poziomach obciążenia. Przedstawiono krzywe S-N, krzywą naprężenie-odkształcenie i degradację sztywności wieloosiowych próbek kompozytowych. Wykonano również testy zmęczenia materiału przy poziomie naprężenia 75%, w etapach 1/3N i 2/3N. Omówiono równoważną wytrzymałość szczątkową i degradację sztywności kompozytowych dzianin wieloosiowych.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2018, 1 (127); 73-80
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Focus shaping of the radially polarized Bessel–Gauss beam with a sine-azimuthal variation wavefront
    Autorzy:
    Gao, X
    Zhang, D.
    Mei, T.
    Fu, R.
    Zhuang, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/174283.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Bessel-Gauss beam
    wavefront modulation
    vector diffraction theory
    Opis:
    Focusing properties of the radially polarized Bessel–Gauss beam with a sine-azimuthal variation wavefront was investigated by the vector diffraction theory. The wavefront distribution is the sine function of the azimuthal angle with one phase parameter that indicates the phase change frequency. Results show that the focal pattern can be altered by the phase parameter, and many novel focal patterns may occur, such as multiple dark-foci focal pattern, crescent shape, and wheel shape. For case of a higher phase beam, the whole focal pattern turns on a symmetric wheel shape with multiple reduplicate intensity elements. When the phase parameter is an odd number, the number of reduplicate elements equals the phase parameter, while when the phase parameter is an even number, the number of reduplicate elements is two times the phase parameter. In addition, the effect of the phase parameter on the focal pattern is more considerable than that of the beam parameter under low numerical aperture. Under higher numerical aperture, the effect of the beam parameter on the focal pattern gets stronger.
    Źródło:
    Optica Applicata; 2013, 43, 3; 567-582
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Focusing of linearly polarized helico-conical Lorentz beam with sine-azimuthal variation wavefront
    Autorzy:
    Bao, Y.
    Lan, J.
    Miao, Y.
    Zhang, D.
    Gao, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/174305.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Lorentz beam
    focusing properties
    optical vortex
    Opis:
    In this article a theoretical research is described into focusing of a linearly polarized helico-conical Lorentz beam with a sine-azimuthal variation wavefront. The simulation results show the vortex charge on the axis, which has an obvious modulation effect on the focal modes of the Lorenz beam under certain beam parameters and phase parameters. Both the phase parameter and the vortex charge are zero, the focal spot appears round. The focal spot is symmetric about y axis when the charge is 0 and the phase parameter is adjusted. And the focal evolution patterns vary remarkably under different beam parameters and the phase parameters. In the process of focus evolution, there appears some novel focal patterns, such as a circle, a “T”, a butterfly, a small running humanoid, a whale tail, a flower of four leaves, a serpentine, a goldfish, a Chinese knot and an octopus, which indicates that the focus mode of the optical vortex Lorentz beam can be altered by changing the phase parameters and vortex charge.
    Źródło:
    Optica Applicata; 2018, 48, 3; 373-387
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Interaction between Two Identical Conducting Spheres in a Uniform Electric Field
    Autorzy:
    Gao, X.
    Wang, Q.
    Li, C.
    Hu, L.
    Sun, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401870.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.Cv
    47.65.Gx
    Opis:
    An experimental apparatus is devised to measure the interaction between two spheres separated by a small gap in a uniform electric field. The results show that the interaction between two conducting spheres is near that between two dielectric spheres with high permittivity. Accordingly, the calculation can be simplified by mirror image method, for it is only available for conducting system. A method using multiple mirror images of point charges is put forward to analyze the induction of two identical conducting spheres in a uniform electric field. The key operation on how to add compensative charges is emphasized and given out in detail. The results from experiment and calculation are compared, and they agree with each other very well.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 289-293
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical gradient force of cosh-Gaussian with sine-azimuthal and half-space phase modulation
    Autorzy:
    Fu, R.
    Gao, X.
    Shen, H.
    Xin, Q
    Lu, X.
    Guo, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/173789.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    optical gradient force
    cosh-Gaussian beams
    wavefront modulation
    Opis:
    The optical gradient force distributions in focal plane of cosh-Gaussian beams with sine-azimuthal variation wavefront and half space phase modulation were investigated. Results show that optical gradient force distributions can be affected considerably by the phase retardation of half-space phase modulation, of a phase parameter that indicates the phase change frequency on an increasing azimuthal angle, and beam parameters in cosh terms of the incident beams. Many gradient force patterns occur, including cross-shape, multiple optical trap arrays, multiple-trap wheel, and many kinds of gradient force lines and curves. Symmetry of the whole gradient force pattern can also be altered remarkably. Above results may find wide applications in optical trapping systems.
    Źródło:
    Optica Applicata; 2013, 43, 4; 719-730
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MGF360-12L of ASFV-SY18 is an immune-evasion protein that inhibits host type I IFN, NF-κB, and JAK/STAT pathways
    Autorzy:
    Chen, Q.
    Wang, X.X.
    Jiang, S.W.
    Gao, X.T.
    Huang, S.Y.
    Liang, Y.
    Jia, H.
    Zhu, H.F.
    Powiązania:
    https://bibliotekanauki.pl/articles/16647496.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    African swine fever virus
    MGF360-12L
    type I IFN
    NF-κB
    JAK/STAT
    Opis:
    African swine fever virus (ASFV) causes feverous and hemorrhagic disease of domestic pigs and European wild boars with high mortality, yet no commercial vaccine is currently available. Several ASFV strains with natural deletion or gene-targeted knockout of multiple MGF360 and MGF505 genes are attenuated in vitro and in vivo, and can offer full protection against homologous challenge. However, the mechanisms underlying the protection are not fully understood. This study aims to investigate the effects of MGF360-12L of ASFV-SY18 on the cGAS-STING signaling pathway and explore the potential mechanisms. We identified that ASFV-SY18 MGF360-12L could inhibit cGAS-STING, TBK1, or IRF3-5D-stimulated IFN-β expression and ISRE activation. Specifically, MGF360-12L inhibits both the activation of PRD(III-I) in a dose-dependent manner, and suppresses the exogenous expression of TBK1 and IRF3-5D. MGF360-12L could block NF-κB activation induced by overexpression of cGAS-STING, TBK1, IKKβ. Downstream of the IFN-β signaling, MGF360-12L blocks the ISRE promoter activation by reducing total protein level of IRF9. Moreover, MGF360-12L protein can inhibit IFN-β-mediated antiviral effects. In conclusion, our findings suggest that MGF360-12L is a multifunctional immune-evasion protein that inhibits both the expression and effect of IFN-β, which could partially explain the attenuation of relevant gene-deleted ASFV strains, and shed light on the development of efficient ASFV live attenuated vaccines in the future.
    Źródło:
    Polish Journal of Veterinary Sciences; 2023, 26, 1; 119-130
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and application of isothermal amplification methods for rapid detection of F4 fimbriae producing Escherichia coli
    Autorzy:
    Zhao, L.Y.
    Niu, J.H.
    Gao, X.L.
    Liu, C.N.
    Liu, S.M.
    Jiang, N.
    Lv, X.P.
    Zheng, S.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087340.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Escherichia coli
    F4 fimbriae
    isothermal amplification
    rapid detection
    clinical samples
    Źródło:
    Polish Journal of Veterinary Sciences; 2020, 23, 1; 143-152
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Internal Friction of Li7La3Zr2O12 Based Lithium Ionic Conductors
    Autorzy:
    Wang, X. P.
    Song, L.
    Hu, J.
    Xia, Y. P.
    Xia, Y.
    Gao, Y. X.
    Zhang, L. C.
    Magalas, L. B.
    Fang, Q. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/958222.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lithium ionic conductor
    Li7La3Zr2O12
    internal friction
    Opis:
    The diffusion mechanisms of lithium ions in tetragonal phase as well as in Al and Nb stabilized cubic Li7La3Zr2O12 compounds were investigated by low-frequency internal friction technique. In the cubic Li7La3Zr2O12 phase, a remarkable relaxation-type internal friction peak PC with a peak height up to 0.12 was observed in the temperature range from 15°C to 60°C. In the tetragonal phase however, the height of the PT peak dropped to 0.01. The obvious difference of the relaxation strength between the cubic and tetragonal phases is due to the different distribution of lithium ions in lattice, ordered in the tetragonal phase and disordered in the cubic phase. Based on the crystalline structure of the cubic garnet-type Li7La3Zr2O12 compound, it is suggested that the high internal friction peak in the cubic phase may be attributed to two diffusion processes of lithium ions: 96h↔96h and 96h↔24d.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 21-24
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Climatic response of Betula ermanii along an altitudinal gradient in the northern slope of Changbai Mountain, China
    Autorzy:
    Wang, X.
    Zhao, X.
    Gao, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/41735.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Opis:
    The sensitivity of Betula ermanii tree-ring growth to climate variation over an altitudinal gradient was assessed. Betula ermanii forest grows in the northern slope of Changbai Mountain from approximately 1,700mabove sea level (a.s.l.), andforms the upper tree line at nearly 2,100ma.s.l.. Six study sites were constructed along the altitudinal gradient (1,670 to 2,010 m a.s.l.) and ring-width chronologies of Betula ermanii were built. The mean tree-ring series intercorrelation (RBAR) increasedwith elevation. In principal component analysis, the first unrotatedprinciple component explained77.1% of the total variance, indicating the tree-ring growth of Beutla ermanii over the altitudinal gradient was governed by regional climate. Correlation function analysis revealedthat the radial growth of Betula ermanii was significantly similar in response to climatic conditions. Overall, the low temperatures during previous June, July and during the dormant period (previous October to current May) andthe high temperatures during current June, July andAugust would benefit the radial growth of Betula ermanii. Abundant precipitation during growing season (previous June, July, September andcurrent August), previous November andcurrent May, wouldalso facilitate the tree-ring growth. The reason for this uniform growth behavior in Betula ermanii remainedunclear. Betula ermanii in Changbai Mountain formedrelatively pure stands with an open canopy, which might be partly contributing to the common growth response to climatic signals along the altitudinal gradient, but further work was required for testing this assumption.
    Źródło:
    Dendrobiology; 2013, 70
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of inner and outer scale on beam spreading for a Gaussian wave propagating through anisotropic non-Kolmogorov turbulence
    Autorzy:
    Gao, C.
    Li, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/174609.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    anisotropy
    Gaussian wave
    long-term spreading radius
    non-Kolmogorov turbulence
    inner scales of turbulence
    outer scales of turbulence
    Opis:
    Experimental results and empirical research have shown that atmospheric turbulence can present the anisotropic property not only at a few meters above the ground but also at high altitudes of up to several kilometers. This paper investigates beam spreading for a Gaussian wave propagating along a horizontal path in weak anisotropic non-Kolmogorov turbulence. Mathematical expressions for the long-term beam spreading radius were obtained based on the generalized von Kármán spectrum for anisotropic turbulence. The final model includes an anisotropic factor, which parameterizes the asymmetry of a turbulence cell, the spectral power law for non-Kolmogorov turbulence, the inner and outer scale of turbulence, and other essential optical parameters of a Gaussian wave. Numerical simulations indicate that the long-term beam spreading radius decreases with an increase in the anisotropic factor. We also analyze how the geometrical optics approximation may cause large errors for a small spectral power law value.
    Źródło:
    Optica Applicata; 2017, 47, 1; 63-74
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Weyls theorem for algebraically k-quasiclass a operators
    Autorzy:
    Gao, F.
    Fang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/256003.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    algebraically k-quasiclass A operator
    Weyl's theorem
    alpha-Weyl's theorem
    Opis:
    If T or T* is an algebraically k-quasiclass A operator acting on an infinite dimensional separable Hilbert space and F is an operator commuting with T, and there exists a positive integer n such that Fn has a finite rank, then we prove that Weyl's theorem holds for ∫ (T)+F for every ∫∈ H(σ (T)), where H(σ (T)) denotes the set of all analytic functions in a neighborhood of σ (T). Moreover, if T* is an algebraically k-quasiclass A operator, then α-Weyl's theorem holds for ∫(T). Also, we prove that if T or T* is an algebraically k-quasiclass A operator then both the Weyl spectrum and the approximate point spectrum of T obey the spectral mapping theorem for every ∫∈ H(σ (T)).
    Źródło:
    Opuscula Mathematica; 2012, 32, 1; 125-135
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Simulation of Fibre Tension in an Asymmetric Ring Spinning Triangle Using FEM
    Numeryczna symulacja naprężeń włókien przy asymetrycznym trójkącie przędzenia w systemie przędzenia obrączkowego
    Autorzy:
    Su, X.
    Gao, W.
    Qin, X.
    Liu, X.
    Xie, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/233077.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    fibre tension
    fibre torque
    ring spinning asymmetric triangle FEM
    naprężenie włókien
    włókno
    trójkąt przędący
    moment obrotowy
    pierścień przędzenia
    Opis:
    In the paper, numerical simulations of fibre tension in one kind of asymmetric ring spinning triangle caused by horizontal offsets of the twisting point is studied by using the finite element method (FEM). A finite element model of the asymmetric ring spinning triangle is first established according to the mechanical properties of the fibre and a geometric model of the spinning triangle. Then the distribution of fibre tension and fibre torque in the asymmetric spinning triangle with and without considering fibre buckling are simulated by using ANSYS software. Effects of the offsets on the distribution of fibre tension and torque in the spinning triangle are studied in detail. The results show that with an increase in the spinning triangle offset, the asymmetric trend of fibre tension distribution in the spinning triangle is more obvious, and the value of fibre tension is also increased, whereas the fibre torque is decreased. Meanwhile with an increase in the yarn twist factor, the value of fibre tension and torque are both greatly increased. In addition, compared with the case where fibre buckling is considered, fibre tensions and torques are considerably increased in the case where fibre buckling is not considered.
    Badano naprężenie włókien powodowane horyzontalnym przesunięciem punktu skrętu. Zastosowano metodę elementów skończonych. Opracowano model asymetrycznego trójkąta uwzględniając mechaniczne właściwości włókien i geometrię utworzoną przez trójkąt przędący. Opracowano rozkład naprężeń i momentów obrotowych włókien przy i bez uwzględnienia wyboczenia włókien. Zastosowano program ANSYS. Wyniki wskazują, że ze wzrostem przesunięcia w trójkącie przędzenia wpływ asymetrii jest bardziej uwidoczniony. Stwierdzono również, że ze wzrostem naprężenia włókien zmniejsza się moment obrotowy. Jednocześnie zaobserwowano, że ze wzrostem współczynnika skrętu wartość naprężeń oraz momentu znacznie wzrasta. Stwierdzono również istotny wpływ wyboczenia włókien.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 6 (120); 81-87
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved linear complexities of the frequency hopping sequences in two optimal sets
    Autorzy:
    Gao, J.
    Li, X.
    Wei, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/206234.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    frequency hopping sequence
    linear complexity
    permutation polynominal
    optimal set
    Opis:
    For the anti-jamming purpose, high linear complexity is desired for each frequency hopping sequence in an optimal set. Using a proper power permutation, Wang has shown that an optimal set of frequency hopping sequences with small linear complexity can be transformed into a new optimal set of frequency hopping sequences with large linear complexity. This paper conains two results. First, we extend the result of Wang. A power permutation is only suitable for a special construction of optimal set of frequency hopping sequences, see Wang (2011). However, the power permutation chosen in this paper applies to the general construction of optimal set of frequency hopping sequences. Second, by using a binomial permutation polynomial P(x), which is different from those permutations used before, we obtain a novel optimal set of frequency hopping sequences with high linear complexity from an optimal set of frequency hopping sequences with small linear complexity. By counting the number of different roots in the sequence representation, we determine the linear complexities of the frequency hopping sequences in two optimal sets transformed by the power permutation or binomial permutation.
    Źródło:
    Control and Cybernetics; 2012, 41, 2; 317-334
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Apparel Design Safety and Production Criteria and Models
    Bezpieczne projektowanie i produkcja odzieży – kryteria i modele
    Autorzy:
    Chen, L.
    Yan, X.
    Gao, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/234142.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    apparel safety
    safety attributes
    design
    production model
    safety evaluation
    bezpieczeństwo odzieży
    atrybuty bezpieczeństwa
    projektowanie
    produkcja modelu
    ocena bezpieczeństwa
    Opis:
    A safe apparel design and production (SADP) model was proposed as a system to guide the development of safe apparel. An objective analysis of user needs and examination of safe nutrients used in apparel design uncovered through related technical regulations/standards induction and recall case analysis led to the development of apparel safety needs criteria. The criteria were then translated into apparel safety attributes and used in the development of the SADP model. A theoretical evaluation model remained to be developed for apparel safety purposes using multi-part disassembly. It is hierarchically structured in accordance with apparel safety attributes, and demonstrates how the apparel design safety criteria was used by a design team or an industry worker. By the introduction of the apparel design safety evaluation model, a further shift to pro-action and to the prevention of losses will be made possible. The research also demonstrates the application of the SADP model to a textile product design problem.
    Zaproponowano kilka modeli bezpiecznego projektowania i produkcji odzieży jako systemu pozyskiwania odzieży bezpiecznej. Przeprowadzono obiektywną analizę potrzeb użytkownika, jak również stosowanych w projektowaniu i produkcji części składowych wyposażenia i odzieży. Doprowadziło to do opracowania kryteriów bezpieczeństwa projektowania i użytkowania.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 6 (120); 32-38
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gradient flow optimization for reducing blocking effects of transform coding
    Autorzy:
    Gao, F.
    Li, X.
    Wang, X.
    Wee, W. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/907251.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ gradientu
    efekt blokowania
    kodowanie transformatowe
    gradient flow
    blocking effects
    optimization
    transform coding
    Opis:
    This paper addresses the problem of reducing blocking effects in transform coding. A novel optimization approach using the gradient flow is proposed. Using some properties of the gradient flow on a manifold, an optimized filter design method for reducing the blocking effects is presented. Based on this method, an image reconstruction algorithm is derived. The algorithm maintains the fidelity of images while reducing the blocking effects. Experimental tests demonstrate that the presented algorithm is effective.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2004, 14, 1; 105-111
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Study of Yarn Torque Caused by Fibre Tension in the Spinning Triangle
    Teoretyczne badania momentu obrotowego przędzy spowodowanego jej napięciem w trójkącie przędzalniczym
    Autorzy:
    Su, X.
    Gao, W.
    Liu, X.
    Xie, C.
    Xu, B
    Powiązania:
    https://bibliotekanauki.pl/articles/232889.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    ring spinning
    spinning triangle
    yarn torque
    fibre tension
    trójkąt przędzalniczy
    moment obrotowy przędzy
    naprężenie włókien
    rdzeń przędzy
    Opis:
    The spinning triangle is a critical region in the spinning process of staple yarn, the geometry of which plays an important role in determining the physical performance and qualities of spun yarns, especially yarn torque. It has been shown that the fibre tension in the spinning triangle is the most influential factor governing the magnitude of yarn torque. Therefore, in this paper, a theoretical study of yarn torque caused by fibre tension in the spinning triangle is presented. Cases of yarn with one, two, three, four and five feeding strands were investigated, in which the arrangement of fibres was assumed as hexagonal close packing with a single core fibre, two core fibres, three core fibres, four core fibres, and five core fibres at the centre, respectively. Theoretical models of the fibre tension in spinning triangles and corresponding yarn residual torque due to the fibre tension are presented. As an application of the method proposed, 26.5 tex cotton yarns were taken as an example for numerical simulations. Fibre tension in the spinning triangles and corresponding yarn torque were simulated numerically using Matlab software.
    Trójkąt przędzalniczy jest istotnym obszarem w procesie przędzenia przędzy z włókien odcinkowych, jego geometria odgrywa ważną rolę w wyznaczaniu właściwości fizycznych oraz jakościowych, zwłaszcza momentu obrotowego przędzy. Wykazano, że naprężenie włókien w trójkącie przędzalniczym znacząco wpływa na wielkość momentu przędzy. Badano przypadki powstawania trójkąta przędzalniczego z jednego, dwóch, trzech, czterech i pięciu strumieni włókien i przy różnych ilościach włókien w rdzeniu przędzy. Badano rozkłady włókien w przędzy oraz powstające siły naprężeń i momenty obrotowe. Sporządzono obliczenia komputerowe i odpowiednie wykresy dla przędzy bawełnianej 26.5 tex.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2014, 6 (108); 41-50
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Study of the Effects of the General Division of a Ring Spinning Triangle on Fibre Tension
    Teoretyczne rozważania efektów podziału trójkąta przędzenia w przędzeniu obrączkowym
    Autorzy:
    Su, X.
    Gao, W.
    Liu, X.
    Xie, C.
    Xu, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/233318.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    general division of spinning triangles
    fibre tension
    ring spinning
    trójkąt przędzenia
    naprężenie włókna
    jakość przędzy
    Opis:
    The geometry of a spinning triangle influences the distribution of fibre tension in it and affects the qualities of spun yarns. Spinning triangle division is one of the most effective measures and fruitful results have been achieved, such as Solospun technology. Therefore a theoretical study of the effects of general ring spinning triangle division on fibre tension is presented in this paper. The general case that the spinning triangle is divided into m parts including m - 1 parts of the primary triangle and one final triangle is investigated and two series of parameters: division proportions b i and triangle number at each part ni are introduced for i = 1, 2, ..., m - 1. Firstly a theoretical model of the fibre tension distributions at the front roller nip is given by using the principle of minimum potential energy. Secondly numerical simulations of fibre tension distributions in the spinning triangle with different division proportions b 1, b 2 and different numbers of primary triangles n1, n2 where m = 3 are presented. It is shown that the demarcation of fibre tension between any two adjacent primary triangles in the first part is decreased with an increasein b 1 or b 2 for the fixed n1 and n2. Meanwhile, for the fixed b 1 and b 2, the total magnitude of fibre tension is increased greatly with an decrease in n1, whereas it rises slightly with an increase in n2. Finally the effects of spinning triangle division on yarn qualities are analysed according to the numerical simulations and previous results.
    Geometria trójkąta skrętu ma wpływ na rozkład naprężeń włókien w trójkącie przędzenia i wpływa również na właściwości przędzy. Przędzalniczy podział trójkąta przędzenia jest jednym z bardziej skutecznych sposobów zmniejszenia naprężeń i daje owocne rezultaty. przeprowadzono teoretyczne rozważania dotyczące skutków podziału trójkąta skrętu na naprężenia włókien. W ogólnym przypadku założono, że trójkąt przędzenia został podzielony na m części. Analiza przeprowadzonych badań wykazała, że naprężenie pojedynczych włókien w podzielonym trójkącie skrętu może być określone poprzez naprężenie przędzenia, liczbę podzielonych części, liczbę pierwotnych trójkątów w każdej części, proporcję podziału, moduł sprężystości początkowej włókien (modułu Younga), przekrój poprzeczny, oraz szerokość i wysokość trójkąta skrętu w przędzeniu obrączkowym. Uwzględniając numeryczne symulacje oraz wcześniejsze rezultaty, przeanalizowano skutki wpływu podziału trójkąta skrętu w przędzeniu obrączkowym na jakość przędzy. Badania wykazały, że odpowiedni (właściwy) podział trójkąta skrętu może korzystnie wpłynąć na jakość przędzy.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 2 (116); 37-43
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the Compact-Siro Spun Yarn Structure
    Badanie struktury przędzy kompaktowej typu Siro–Spun
    Autorzy:
    Su, X.
    Gao, W.
    Liu, X.
    Xie, C.
    Xu, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/949446.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    Compact-Siro spinning
    yarn structure
    sections
    przędza kompaktowa
    technologia przędzenia Siro-Spun
    przędzarki obrączkowe
    struktura przędzy
    Opis:
    Compact-Siro spinning technology is one of the most widely used spinning methods. It is conducted on a compact ring frame by simultaneously feeding two rovings into the drafting zone at a predetermined separation. In fact, Compact-Siro spinning incorporates the features of both Compact and Siro-spinning systems. In this paper, the structure of Compact- Siro spun yarn is investigated. By using a DZ3 video microscope, the horizontal structure of Compact-Siro spun yarn, Sirospun yarn, Compact yarn and Ring spun yarn were obtained. It is shown that compared with Compact single yarn, Compact-Siro spun yarn has a more compact and clear surface structure, a more uniform and smooth shape, and less hairiness. Then the cross section structure of Compact yarn and Compact-Siro spun yarn were obtained by using Hardy’s Y172 thin cross-section sampling device and the DZ3 video microscope. It is shown that compared with Sirospun yarn, the cross-section of Compact-Siro spun yarn is smoother and closer to being circular. Meanwhile in the Compact-Siro spun yarn body, the fibers of two substrands show axial symmetrical distribution approximately, which is beneficial for spun yarn qualities, especially for improving the yarn evenness and hairiness. Finally the results obtained were illustrated in spinning experiments.
    Technologia kompaktowego przędzenia Siro-Spun jest szeroko stosowaną metodą przędzenia. Prowadzona jest na kompaktowych przędzarkach obrączkowych przez równoczesne wprowadzenie dwóch taśm włókien w strefę rozciągu. W rzeczywistości kompaktowe przędzenie Siro-Spun łączy w sobie właściwości przędzenia kompaktowego i Siro-Spun. W pracy, stosując wideo mikroskop DZ3 badano strukturę przędzy otrzymanej przy pomocy różnych metod przędzenia. Wykazano, że najlepsze właściwości ma przędza wykonana za pomocą metody kompakt Siro-Spun, odznaczająca się większą zwartością, równomiernością i mniejszą włochatością. Uzyskane obserwacje potwierdzono wynikami eksperymentalnymi.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2015, 3 (111); 54-57
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Convergence Point of Three-strand Yarn Spinning
    Punkt zbieżności przy przędzeniu przędz trójtaśmowych
    Autorzy:
    Su, X.
    Gao, W.
    Liu, X.
    Xie, C.
    Huang, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/232053.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    three-strand yarn spinning
    theoretical model
    convergence point
    przędzenie przędz trójtaśmowych
    model teoretyczny
    punkt zbieżności
    Opis:
    A theoretical model for the three-strand yarn spinning system is obtained by using the analysis method for the two-strand case presented by He et al. and setting a series of virtual intermediate variables. Then the convergence point of the three-strand yarn spinning is obtained by eliminating the intermediate variables.
    Opracowano teoretyczny model systemu przędzenia trójtaśmowej przędzy z wykorzystaniem modelu przędzy dwutaśmowej przedstawionego przez He i innych. Wprowadzono serię teoretycznych zmiennych przejściowych, a następnie ustalono punkt zbieżności dla systemu przędzenia przędzy trójtaśmowej przez eliminacje zmiennych pośrednich.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2013, 3 (99); 48-50
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the Performance of a Drafting Device for the Four-Line Compact Spinning System
    Badania sprawności działania urządzenia rozciągowego na czterostrumieniowy system przędzenia kompaktowego
    Autorzy:
    Su, X.
    Gao, W.
    Liu, X.
    Xie, C.
    Xu, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/233591.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    four-line compact spinning system
    yarn quality
    top pin
    cradle
    drafting devices
    kompaktowy system przędzenia
    jakość przędzy
    wytrzymałość na rozciąganie
    Opis:
    Compact spinning is one of the most important improvements of traditional ring spinning, which is implemented by adding a fibre condensing device to condense the fibre bundle and decrease the spinning triangle, thereby improving the qualities of yarn. Pneumatic compact spinning is the most widely used compact spinning method at present. Four-line compact spinning is one of the most important kinds of pneumatic compact spinning, which is implemented by using a Lattice apron to achieve fibre condensing, decrease the spinning triangle and improve the yarn qualities, especially reducing yarn hairiness. In this paper, the performances of drafting devices for Four-line compact spinning were studied. First the structure and performance of an SDDA2122PH pneumatic cradle equipped with a new kind of block top roller retaining bar were discussed and the pressure distribution of the cradle presented firstly. Then 7.3 tex T65/JC35 was spun on an EJM128K spinning frame equipped with an SDDA2122PH pneumatic cradle, the pressure distributions measured, and the spun yarn qualities were measured and analysed accordingly. Then the acting mechanism of three kinds of top pin: a common top pin without a press bar, a top pin with a front pressure bar, a top pin with a back pressure bar, with respect to yarn qualities was analyzed firstly, and then JC 18.2 tex, JC60/T40 18.4 tex and T 18.4 tex yarns were spun on an EJM128K spinning frame equipped with different top pins. Then the qualities of the spun yarns were analyzed according to the acting mechanism of the top pin. The results show that by using the new block top roller retaining bar, the pressure of the pneumatic cradle is larger and more stable, thereby improving the spun yarn’s comprehensive qualities. For cotton yarn, we can reduce yarn hairiness by using a top pin with a pressure bar; for chemical fibre and cotton blended yarn, yarn strength can be improved by using a top pin with a pressure bar, and for chemical fibre pure yarn, the usage of a top pin with a pressure bar is beneficial for improving yarn strength and evenness, but not for yarn hairiness and yarn thin and thick places.
    Przędzarkę kompaktową wyposażono w czteroparwałkowy aparat rozciągowy i dodatkową cholewkę umożliwiającą kondensację włókien i zmniejszenie trójkąta przędzenia i poprawę jakości przędzy, zwłaszcza zmniejszenie włochatości przędzy. Oprócz mechanizmu zagęszczającego wiązkę włókien na właściwości fizyczne przędzy duży wpływ wywiera również konstrukcja i działanie samego aparatu rozciągowego. Mając powyższe założenie na uwadze przeanalizowano konstrukcję i działanie zmodyfikowanego ramienia wyposażonego w pneumatyczny docisk. Przeprowadzono również kinematyczną analizą rozkładu ciśnień w aparacie rozciągowym wyposażonym w tradycyjne ramię dociskowe oraz ramię zmodyfikowane. W tym celu rozpatrzono analizę równowagi momentów ciśnień dla obu konstrukcji. W następnej kolejności dokonano wyprzędów wybranych rodzajów przędz i wyznaczono dla niej wybrane właściwości fizyczne obejmujące równomierność masy liniowej, wytrzymałość na rozciąganie oraz włochatość. Badania wykazały, że zastosowanie zmodyfikowanej konstrukcji ramienia dociskowego przyczyniło się do zwiększenia wytrzymałości przędzy i jej równomierności, ale wbrew oczekiwaniom nie wpłynęło na poziom włochatości.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 2 (116); 44-51
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of alpha and gamma radiolysis on Pu retention in the solvent TBP/kerosene
    Autorzy:
    Gao, Y
    Zheng, W.
    Cao, X.
    Chen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/148296.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    purex process
    TBP solvent
    alpha radiolysis
    gamma radiolysis
    Pu retention
    Opis:
    In light of the issue of radiolysis of the solvent system in PUREX process, alpha and gamma radiation stability of tributyl phosphate (TBP)/kerosene (OK) have been studied in this paper, in which 238Pu dissolved in the organic phase and 60Co are selected as alpha and gamma irradiation sources, respectively. The amount of the degradation products not easily removed after the washing process has been measured by the plutonium retention. The effects of the absorbed dose, the TBP volume fraction, the cumulative absorbed dose and the presence of UO2 2+ and Zr4+ on the radiolysis of the solvents have been investigated. The results have indicated that the Pu retention increases with the increase of the absorbed dose after alpha or gamma irradiation, and is larger for the solvent containing less TBP. There is competition between UO2 2+ and Pu4+ to complex with the degradation products, and Zr4+ accelerates the radiolysis of the system.
    Źródło:
    Nukleonika; 2014, 59, 4; 123-128
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Simulation of Jacquard Warp-knitted Towel Fabric
    Projektowanie i symulacja żakardowej ręcznikowej dzianiny osnowowej
    Autorzy:
    Cong, H.
    Li, X.
    Zhang, A.
    Gao, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/231894.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    warp knitting
    towel
    jacquard
    model
    design
    simulation
    ręczna symulacja żakardowa
    struktura dzianiny
    projektowanie CAD
    Opis:
    This article proposes a method for designing and simulating jacquard warp-knitted towel fabric. Artistic conception drawing was used in realising the CAD design function of jacquard warp-knitted towel fabric based on the fabric structure and knitting principle. This study applied NURBS curves and the surface principle to build a three-dimensional solid model of the terry loop. Then using microscope type measurement instruments, the terry loop forms of the fabric surface were analysed and models of different forms of terry loop on the fabric surface built. With visual C++ for development tools combined with OpenGL graphics libraries, a CAD design and simulation function of jacquard warp-knitted towel fabric were finally realized within the CAD system.
    W artykule zaproponowano metodę projektowania i symulacji żakardowej ręcznikowej dzianiny osnowowej. Artystyczną koncepcję uwidocznioną na rysunku wykorzystano przy realizacji funkcji projektowania CAD w oparciu o strukturę dzianiny i zasady dziania. W analizie wykorzystano krzywe NURBS i charakterystykę powierzchni dla konstrukcji trójwymiarowych brył modelu pętli frotte. Następnie za pomocą pomiarów mikroskopowych analizowano pętle frotte utworzone na powierzchni dzianiny i stworzono modele różnych form tych pętli. Wykorzystując wizualizacje C++ w kombinacji z programem graficznym OpenGL zaprojektowano przy pomocy CAD wzory i symulacje funkcji żakardowej dzianiny osnowowej.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2014, 5 (107); 54-58
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical behavior of clinched sheet material joints and strength design procedure
    Autorzy:
    He, X.
    Gao, A.
    Yang, H.
    Xing, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1155166.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    46.70.-p
    Opis:
    Clinching is an effective joining technique for lightweight sheet materials that are difficult or impossible to weld. A theoretical model for clinched joints in metal sheets was established and a design method for improving joint strength by selecting different clinching tools was proposed. The analytic model is defined as a function of the neck-thickness and the undercut, which are the key parameters of joint geometry. Based on the analytic model, the design method of clinched joint strength that can satisfy required strength was proposed. Clinching experiments were conducted with 2.00 mm thick aluminium alloy 5052 sheets. Various conditions were used during the clinching process to validate the joint strength model. Tensile-shear strength of clinched joints was measured by a servo-hydraulic testing machine. The calculated joint strength was in good agreement with the experimental results.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 698-700
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanism and Kinetics Studies on Non-Isothermal Decomposition of Ludwigite in Inert Atmosphere
    Autorzy:
    Fu, X.
    Chu, M.
    Gao, L.
    Liu, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/352128.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ludwigite
    non-isothermal decomposition
    kinetics
    activation energy
    model function
    Opis:
    Ludwigite is the main available boron-bearing resource in China. In order to enrich the theory system and optimize its utilization processes, this paper study the mechanism and kinetics on non-isothermal decomposition of ludwigite in inert atmosphere by means of thermal analysis. Results show that, the decomposition of serpentine and szajbelyite is the main cause of mass loss in the process. At the end of decomposition, hortonolite and ludwigite are the two main phases in the sample. The average E value of structural water decomposition is 277.97 kJ/mol based on FWO method (277.17 kJ/mol based on KAS method). The results is proved to be accurate and reliable. The mechanism model function of structural water decomposition is confirmed by Satava method and Popescu method. The form of the most probable model function is G(α) = (1 – α)–1– 1 (integral form) and f (α) = (1 – α)2 (differential form), and its mechanism is chemical reaction. This is verified by the criterion based on activation energy of model-free kinetics analysis.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1217-1224
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The port service ecosystem research based on the Lotka-Volterra model
    Autorzy:
    Li, W.
    Liu, W.
    Xu, X.
    Gao, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/259265.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    port service ecosystem
    niche breadth
    competitive co-evolution
    mutually beneficial co-evolution
    Opis:
    Under the new normal of China’s economy, the competition among the port enterprises is not only the competition of the core competence of the port, the port industry chain or the port supply chain, but also the competition of the port service ecosystem. In this paper, the concept and characteristics of the port service ecosystem is discussed, a hierarchical model of the port service ecosystem is constructed. As an extended logistic model, Lotka-Volterra model is applied to study the competitive co-evolution and mutually beneficial co-evolution of enterprises in the port service ecosystem. This paper simulates the co-evolution of enterprises in the port service ecosystem by using MATLAB programming. The simulation results show that the breadth of the niche of the enterprises is changing with the change of the competition coefficient and the coefficient of mutual benefit in the port service ecosystem. Based on that, some proposals are put forward to ensure the healthy and orderly development of the port service ecosystem.
    Źródło:
    Polish Maritime Research; 2017, S 3; 86-94
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catalytic conversion of kraft lignin using paper-like Co(salen) as an effective catalyst
    Autorzy:
    Gao, T.-T.
    Zhou, X.-F.
    Zhu, Z.-L.
    Powiązania:
    https://bibliotekanauki.pl/articles/52817.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    catalytic conversion
    kraft lignin
    catalyst paper
    phenolic compound
    Co(salen) powder
    Opis:
    Co(salen) powders were homogeneously scattered over a ceramic fibre network to give a catalyst paper and the Co(salen) paper was tested for the oxidative degradation of a kraft lignin using H2O2 as an oxidant. Due to the structural effect of the interconnected 3D-network, the catalyst paper exhibited a higher performance in the oxidation of kraft lignin with a oil yield of 23.27 % than the original Co(salen) powder with an oil yield of 10.63 %, along with excellent recycling performance. 2,6-Dimethoxyphenol (2.32 mg/kg kraft lignin), vanillin (3.80 mg/kg kraft lignin), and syringaldehyde (2.63 mg/kg kraft lignin) were found to be the main products in the oil obtained. In addition, the structural changes in the kraft lignin were also studied during the process. The phenolic compounds were formed through side chain oxidation together with the oxidative cleavage of β-O-4 linkage.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2015, 58, 195
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research of Fluorinated Acrylate Copolymer on Flax Fabric
    Badania wpływu emulsji kopolimeru akrylanowego zawierającej fluor na właściwości tkanin lnianych
    Autorzy:
    Sui, Z.
    Yang, K.
    Chen, J.
    Zhao, X.
    Gao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/234076.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    fluorine-containing acrylate
    core-shell polymerisation
    linen fabric
    finishing agent
    hydrophobicity
    lipophobicity
    fluor
    akrylan
    polimeryzacja rdzeń-otoczka
    tkanina lniana
    hydrofobowość
    lipofobowość
    Opis:
    A fluorine-containing acrylate copolymer emulsion was prepared in this study, which was applied to finishing linen fabric. Dodecafluloroheptry methacrylate (G04) was used as a modified monomer, butylacrylate (BA) and methylacrylate (MMA) as soft and hard monomers.respectively, and acrylic acid as a functional monomer. Structure and properties of the products were characterised and analyzed by FTIR, TEM, PSD and CA measurements, respectively. The water and air permeability as well as the breaking force of the fabric treated were also investigated. The results showed that the fluorine-containing acrylate copolymer emulsion obtained had a core-shell structure, and the microsphere was of nanoscale size. Because of the latex film on the fabric surface, it became smooth and flat. And the increase in G04 was beneficial to the mechanical properties, waterproofness and antifouling ability of the linen fabric. When the content of G04 were increased from 0% to 20%, the water in the linen sample and hexadecane contact angles to the copolymer film increased from 113.02° to 136.08° and from 65.1° to 87.6°,respectively. Furthermore the breaking force of the linen samples was enhanced from 648 N to 721N. However, the increasing content of G04 had negative effects on the flexural rigidity as well as water and air permeability of the fabric, which were essential requirements for the fabric’s application. However, the wash resistance was excellent and the wear-resistance of the finished linen fabric was better than the unfinished linen fabric.
    W pracy przygotowano emulsję kopolimeru akrylanowego zawierającą fluor, którą następnie zastosowano do wykańczania tkanin lnianych. Jako modyfikowany monomer zastosowano metakrylan dodekafluoroheptan (G04), a jako miękkie i twarde monomery użyto akrylan butylu (BA) i akrylan metylu (MMA), a kwas akrylowy jako monomer funkcjonalny. Strukturę i właściwości produktów scharakteryzowano i przeanalizowano za pomocą pomiarów FTIR, TEM, PSD i CA. Przebadano również przepuszczalność wody i powietrza oraz siłę zrywania tkaniny poddanej obróbce. Wyniki wykazały, że otrzymana fluorowa emulsja kopolimeru akrylanowego miała strukturę rdzeń-otoczka, a mikrosfera miała rozmiar w nanometrach. Ze lateksowej powłoce tkanina stała się gładka i matowa. Stwierdzono, że wzrost G04 wpływa korzystnie na właściwości mechaniczne, wodoodporność i zdolność przeciwporostową tkaniny lnianej. Zwiększenie zawartości G04 spowodowało wzrost kąta zwilżania, a siła zrywania próbek zwiększyła się z 648 do 721 N. Jednak wzrastająca zawartość G04 miała negatywny wpływ na sztywność zginania, a także przepuszczalność wody i powietrza tkaniny, które były zasadniczymi cechami wymaganymi dla aplikacji tkaniny. Jednakże odporność na pranie i zużycie była lepsza w przypadku próbek powleczonych.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 6 (126); 83-88
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationship between flotation and Fe/Mn ratio of wolframite with benzohydroxamic acid and sodium oleate as collectors
    Autorzy:
    Yang, S.
    Feng, Q.
    Qiu, X.
    Gao, Y.
    Xie, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/109666.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    wolframite
    flotation
    collector mixture
    benzohydroxamic acid
    sodium oleate
    Opis:
    Several studies revealed that flotation of wolframite changes with different Fe/Mn ratios, but they did not reach a consensus. This relationship in the presence of benzohydroxamic acid (BHA) and sodium oleate (NaOl) as collectors was studied in this paper through comparison of probability distribution curve of wolframite with different Fe/Mn ratios between the raw ore and the flotation concentrate, the pure mineral flotation and solution chemistry of flotation. The results showed that wolframite with high Fe/Mn ratio showed higher flotation with BHA as a collector while the flotation behavior of wolframite was completely opposite with NaOl as a collector. Besides, the calculations of chemical equilibrium in the solution were plotted as ΔG°-pH graphs. The results revealed that the flotation of wolframite may be determined by the interaction between BHA and ferric(II) ion or between NaOl and manganous ion. From the perspective of collector mixture, the results also explain the high collecting capability of the BHA/NaOl collector mixture, which can be defined as “functional complementation”.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 2; 747-758
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of quinoline from aqueous solutions by lignite, coking coal and anthracite. Adsorption isotherms and thermodynamics
    Autorzy:
    Xu, H.
    Huagn, G.
    Li, X.
    Gao, L.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/110016.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quinoline adsorption
    coking coal
    adsorption isotherms
    thermodynamics
    Opis:
    Based on the concept of circular economy, a novel method of industrial organic wastewater treatment by using adsorption on coal is introduced. Coal is used to adsorb organic pollutants from coking wastewaters. After adsorption, the coal would be used for its original purpose, its value is not reduced and the pollutant is thus recycled. Through systemic circulation of coking wastewater zero emissions can be achieved. Lignite, coking coal and anthracite were used as adsorbents in batch experiments. The quinoline removal efficiency of coal adsorption was investigated. The coking coal and anthracite exhibited properties well-suited for adsorption onto both adsorbents. The experimental data were fitted to Langmuir and Freundlich isotherms as well as Temkin, Redlich–Peterson (R-P) and Dubinin-Radushkevich (D-R) models. Both Freundlich Isotherm and D-R model provided reasonable models of the adsorption process. The thermodynamic parameters of quinoline adsorption on coking coal were calculated. The thermodynamic parameters indicated that the adsorption process is exothermic and is a physical adsorption. The △S° value indicated that the adsorption entropy decreased because the adsorbate molecule was under restrictions after it adsorption on the coal surface. The coal adsorption method for removing refractory organic pollutants is a great hope for achieving zero emission waste water for a coking plant.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 214-227
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pretreatment of coking wastewater by an adsorption process using fine coking coal
    Autorzy:
    Gao, L.
    Li, S.
    Wang, Y.
    Gui, X.
    Xu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/110417.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    coking coal
    coking wastewater
    adsorption
    COD
    phenol
    Opis:
    A new technique for pretreatment of coking wastewater is introduced based on the concept of circular economy. Coal is fed into a coking system after adsorption. This study validates the feasibility of using coking coal to adsorb organic pollutants in coking wastewater. The sorption kinetics and equilibrium sorption isotherms of coking coal for removal of chemical oxygen demand (COD) and phenol from coking wastewater was also discussed in this paper. Gas chromatograph/mass spectroscopy (GC/MS) was used to detect changes in the quality of coking wastewater. The results showed that when coking coal dosage was 120 g/dm3, 65% of COD and 34% of phenol in waste water can be removed after 40 min of agitation. The surface functional groups of coking coal before and after adsorption were observed with a Fourier transform infrared spectrometer. The kinetics of COD and phenol adsorption from coking wastewater by coking coal fitted the pseudo second-order model. The adsorption process of coking coal can be classified into two categories, namely, rapid and slow. The Freundlich isotherm provided a better fit with all adsorption isotherms than the Langmuir isotherm. Coking coal could be a suitable low-cost adsorbent for recalcitrant organic pollutants.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 422-436
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correction of sample-time error for time-interleaved sampling system using cubic spline interpolation
    Autorzy:
    Qin, G.
    Liu, G.
    Gao, M.
    Fu, X.
    Xu, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221115.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital correction
    sample-time error
    time-interleaved sampling system
    cubic spline interpolation
    Opis:
    Sample-time errors can greatly degrade the dynamic range of a time-interleaved sampling system. In this paper, a novel correction technique employing a cubic spline interpolation is proposed for inter-channel sample-time error compensation. The cubic spline interpolation compensation filter is developed in the form of a finite-impulse response (FIR) filter structure. The correction method of the interpolation compensation filter coefficients is deduced. A 4GS/s two-channel, time-interleaved ADC prototype system has been implemented to evaluate the performance of the technique. The experimental results showed that the correction technique is effective to attenuate the spurious spurs and improve the dynamic performance of the system.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 3; 485-496
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method for probing the refractive index change in photorefractive crystals
    Autorzy:
    Fu, M.
    Gao, C.
    Wang, X.
    Cui, Y.
    Dai, S
    Powiązania:
    https://bibliotekanauki.pl/articles/174913.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Fourier transform profilometry
    refractive index change
    photorefractive effect
    Opis:
    A method for probing refractive index changes in photorefractive crystals using an interferometric technique and digital image processing was proposed. Based on equal thickness interference in LiNbO3 crystal and Fourier transform profilometry, we obtained phase value changes in interferograms induced by a photorefractive effect, and further calculated refractive index changes. The maximal values for extraordinary light (e-light) and ordinary light (o-light) are 6.6×10–4 and 1.2×10–4, respectively.
    Źródło:
    Optica Applicata; 2013, 43, 4; 731-737
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the statistical characteristics of crosstalk in naval ships wiring harness based on Polynomial Chaos Expansion method
    Autorzy:
    Chi, Y.
    Li, B.
    Yang, X.
    Wang, T.
    Yang, K.
    Gao, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/260090.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    naval ships wiring harness
    crosstalk
    Polynomial Chaos Expansion
    statistical characteristics
    Opis:
    Crosstalk in wiring harness has been studied extensively for its importance in the naval ships electromagnetic compatibility field. An effective and high-efficiency method is proposed in this paper for analyzing Statistical Characteristics of crosstalk in wiring harness with random variation of position based on Polynomial Chaos Expansion (PCE). A typical 14-cable wiring harness was simulated as the object of research. Distance among interfering cable, affected cable and GND is synthesized and analyzed in both frequency domain and time domain. The model of naval ships wiring harness distribution parameter was established by utilizing Legendre orthogonal polynomials as basis functions along with prediction model of statistical characters. Detailed mean value, mean square error, probability density function and reasonable varying range of crosstalk in naval ships wiring harness are described in both time domain and frequency domain. Numerical experiment proves that the method proposed in this paper, not only has good consistency with the MC method can be applied in the naval ships EMC research field to provide theoretical support for guaranteeing safety, but also has better time-efficiency than the MC method. Therefore, the Polynomial Chaos Expansion method.
    Źródło:
    Polish Maritime Research; 2017, S 2; 205-214
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Somaclonal variation in winter wheat [Triticum aestivum L.]: frequency, occurrence and inheritance
    Autorzy:
    Cheng, X Y
    Gao, M.W.
    Liang, Z.Q.
    Liu, G.Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044461.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inheritance
    tissue culture
    Triticum aestivum
    occurrence
    in vitro
    winter wheat
    gene mutation
    plant breeding
    callus induction
    frequency
    somaclonal variation
    wheat
    embryo
    Opis:
    Plants were regenerated from immature embryo cultures of 35 winter wheat genotypes. General responses of regenerated plants were investigated and a total of 7142 R₂ spike lines from 1593 R₁ plants were assessed in the field for somaclonal variants in 1985/86, 1986/87 and 1987/88. Selected variants were studied for their possible genetic inheritance. From regenerated plantlets, 81% survived and 63% produced fertile plants. Forms with reduced plant height, length of spike and other morphological abnormalities were found in this progeny. Populations of R₁ plants were highly variable due mainly to the physiological disturbances resulting from the in vitro process. Overall somaclonal variation frequencies were 14.2% per plant basis and 5.3% per R₂ spike basis. The variants were similar in the three different R₂ generations with predominant variants being negative in plant height, maturity, awns, spike type and plant type. Both uniform R₂ variant families and spike lines were found in addition to the segregating variants which constituted the majority. On average, in a variant family or line, 18% and 14% of their component lines and plants were variants, respectively. Inheritability was demonstrated for the uniform variant families and spike lines as well as segregated variants. Of those 134 selections, about 70% were classified as inheritable. Both recessive and dominant gene mutations at one, two or three loci were evident in some variants as suggested by the segregating data.
    Źródło:
    Journal of Applied Genetics; 1998, 39, 1; 59-72
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antioxidant activity and mechanism in flower of Hylocereus undatus (Haw.) Britt. et Rose
    Autorzy:
    Li, X.
    Gao, Y.
    Han, W.
    Lin, J.
    Hu, Q.
    Chen, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/19838.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Hylocereus undatus flower is commonly used as food or for medicinal purposes in south China. To study its antioxidant activity and mechanism we used antioxidant and chemical assays to compare two commercial samples from different locations (Shenjing, Qixing). The difference in antioxidant levels corresponded with differences in chemical content (including total phenolics, total flavonoids, kaempferol and quercetin) between Shenjing and Qixing. The antioxidant ability of H. undatus flower seems attributable to total phenolics (mainly total flavonoids). Kaempferol is one of the main bioactive components. H. undatus flower exerts its antioxidant effects through metal chelation and radical scavenging via hydrogen atom (H•) and electron (e) donation.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2013, 55, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel method to extract vanadium from vanadium-bearing steel slag using sodium carbonate solution
    Autorzy:
    Gao, M.
    Xue, X.
    Li, L.
    Yang, H.
    Bai, R.
    Wang, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/109859.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    leaching
    kinetics
    vanadium
    vanadium-bearing steel slag
    Opis:
    A new method using sodium carbonate solution to treat a vanadium-bearing steel slag is proposed. The effects of the particle size, solid-to-liquid ratio, initial concentration of sodium carbonate solution, leaching temperature and stirring speed on the leaching rate of vanadium were investigated. The leaching kinetics of vanadium from the vanadium-bearing steel slag was studied, which indicated that the leaching rate was controlled by the step of diffusion through the solid layer around the unreacted core. The apparent activation energy for the process was 13.75 kJ/mol. By using this process, vanadium could be extracted effectively with the leaching rate of more than 80%.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 911-921
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of Twinned Dendrites of Al-Zn Alloy with High Zn Content
    Autorzy:
    Gao, K.
    Song, W.
    Fan, L.
    Ding, Y.
    Guo, X.
    Zhang, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/351396.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    directional solidification
    twinned dendrite
    microstructure
    growth orientation
    deviation angle
    Opis:
    Twinned dendrites in Al-Zn alloy with high Zn content (40% wt.%) were successfully prepared by directional solidification. At different directional solidification rates (1000 and 1500 μm/s), microstructures and growth orientation variations of Al twinned dendrite and non-twinned dendrite were characterized. By using the inverted trapezoidal graphite sleeve at 1000 μm/s, Al twinned dendrite were formed to developed feather crystal structures in longitudinal section. Its primary and secondary twinned dendrite were grew along [110] direction. Moreover the deviation angle between [110] direction of Al twinned dendrite and the heat flow direction was about 27.15°. While not using the inverted trapezoidal graphite sleeve at 1000 and 1500 μm/s, Al dendrite was the non-twinned dendrite and the twinned dendrite was not appeared. The experimental results showed that the higher temperature gradient, a certain pulling rate and convection environment were the formation conditions of twinned dendrites.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1657-1662
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nutritional components and antioxidant activities of Firmiana platanifolia seeds in response to different germination times
    Autorzy:
    Zhi, X.M.
    Qian, W.Z.
    Song, Y.
    Mu, C.J.
    Yu, D.S.
    Lin, X.
    Gao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/53374817.pdf
    Data publikacji:
    2024
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Germination can be used to enhance nutritional value and health functions of edible seeds. Sprouts are considered healthier than non-germinated seeds because they are richer in the basic nutritional components (protein, amino acid, carbohydrates, and minerals) and also contain more bioactive components. The present study is the first to dynamically analyze the germination properties regarding morphological characteristics, nutrient compounds, bioactive components and antioxidant activities of Firmiana platanifolia (F. platanifolia) seeds. The results showed that the appearance, color and morphology of F. platanifolia seeds and sprouts at different germination times showed considerable differences. With the increasing germination time, the moisture content, sucrose, fructose, total flavonoid content and DPPH significantly increased, and reached the peak at 8 d of germination, almost 2.38, 5.76, 4.02, 7.97 and 8.91 times higher than those of at 0 d, respectively. The soluble protein, total phenolic, ABTS and ferric reducing antioxidant power (FRAP) increased first and then decreased as the germination time increased, and were overall higher than those of at the initial concentration. However, total starch content and mineral elements decreased as germination progressed. Additionally, the total flavonoid content showed a strongly positive correlation with DPPH (p<0.01), whereas the total phenolic and total flavonoid content showed a similar, significant and positive correlation with ABTS and ferrous ion chelating activity (FICA, p<0.05). Therefore, seed germination significantly increased phytochemical contents and antioxidant activity. The current research results will help to reveal the dynamic changes in nutrient content and antioxidant activity of F. platanifolia seeds during the germination process, and provide reference data for further studying the development and utilization of germinated seeds.
    Źródło:
    Journal of Elementology; 2024, 29, 1; 193-212
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CdSe/ZnS Colloidal Quantum Dots with Alloyed Core/Shell Interfaces: A Photoluminescence Dynamics Study
    Autorzy:
    Dziatkowski, K.
    Ratchford, D.
    Hartsfield, T.
    Li, X.
    Gao, Y.
    Tang, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492859.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    78.47.jd
    78.55.Et
    Opis:
    Time-resolved photon counting technique was employed to study dynamics of photoluminescence from the ensemble and single CdSe/ZnS quantum dots with the alloyed core/shell interfaces. The ensemble data revealed enhanced effect of disorder-induced trap states for increasing emission energy, as implied from the changes in the distribution of total decay rates. The emission trajectories collected for single quantum dots showed familiar, two-state blinking pattern. It suggests that in a large-band-offset CdSe/ZnS system, the introduced alloying of the core-to-shell region cannot smooth enough the confinement potential in order to suppress nonradiative Auger recombination and blinking.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 870-873
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Smart services for enhancing personal competence in Industrie 4.0 digital factory
    Usługi typu smart służące zwiększeniu kompetencji personalnych w zakładzie przemysłowym typu Industrie 4.0
    Autorzy:
    Sun, J.
    Gao, M.
    Wang, Q.
    Jiang, M.
    Zhang, X.
    Schmitt, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/362246.pdf
    Data publikacji:
    2018
    Wydawca:
    Wyższa Szkoła Logistyki
    Tematy:
    Industrie 4.0
    industrial Internet-of-Things
    indoor localization
    smart wearables
    augmented reality
    enhancement of productivity
    przemysłowy Internet rzeczy
    lokalizacja wewnętrzna
    nośniki smart
    rozszerzona rzeczywistość
    poprawa produktywności
    Opis:
    Background: Adaptive digitalization and networking of machines, working parts, employees and other entities on the plant floor are core of realizing industry 4.0, so that information and instruction will be available everywhere and all the time in the production process. Thus, smart devices, especially smart wearables, will play a very important role to help workers being integrated in the in the future manufacturing environment, as information need to be transferred faster and with the right level of detailing with respect to the individual need of workers, factory managers etc. Methods: The implementation of an indoor localization system using Bluetooth beacons in the shop floor as part of an enterprise IoT platform was introduced. This sensor network is aimed to implement tracing and tracking of workers and working parts in the future smart factory, as well as the to the networking of the smart wearables with existing manufacturing machines. The investigated problem was the inaccuracy and the instability of the sensor signals by such Bluetooth sensor networks. To solve the problem, various algorithms were investigated. Results and conclusions: The possible solution of given problem was solved by finding an algorithm improving the communication between devices. Together with the location information from Beacon network and orientation information from the compass sensor, it is able to determine the machine in the near, which the employee with the Smart Glasses is currently pointing to.
    Wstęp: Zastosowanie sieciowych rozwiązań dla urządzeń i ich części, jak również jako wspomożenie dla pracowników na poziomie hali produkcyjnej jest podstawowym elementem wdrożenia Industry 4.0., dzięki czemu w każdym momencie i w każdym miejsce zapewnia się dostępność do potrzebnej informacji. W związku z tym, urządzenia mobilne typu smart będą odgrywały ważną rolę w integrowaniu pracowników w środowisko produkcyjne w przyszłości, informacja będzie mogła być przekazywana szybciej i z większą szczegółowością w odniesieniu do poszczególnych pracowników czy kadry zarządzającej. Metody: Zastosowanie wewnętrznej lokalizacji przy użyciu Bluetooth beaconów na poziomie hali produkcyjnej jako fragmentu zakładowej platformy Internetu rzeczy zostało wdrożone. Sieć sensorów ma na celu śledzenie pracowników oraz urządzeń w przyszłościowym zakładzie produkcyjnym, jak również ma być połączeniem z istniejącym parkiem urządzeń produkcyjnych. Badany problem polegał na nietrafności i niestabilności sygnałów sensorów używanych w tej sieci. W celu rozwiązania problemu poddano analizie różne algorytmy możliwych rozwiązań. Wyniki i wnioski: Znaleziono możliwe rozwiązanie analizowanego problem poprzez określenie odpowiedniego algorytmu poprawiającego komunikację pomiędzy urządzeniami. W połączeniu z lokalizacją informacji przy zastosowania sieci beaconów oraz zorientowaniu informacji pochodzących z sensorów, można było zlokalizować urządzenie znajdujące się w pobliżu danego pracownika przy użyciu okularów Smart Glasses.
    Źródło:
    LogForum; 2018, 14, 1; 51-57
    1734-459X
    Pojawia się w:
    LogForum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of quinoline from aqueous solutions by lignite, coking coal and anthracite. Adsorption kinetics
    Autorzy:
    Xu, H.
    Wang, Y.
    Huagn, G.
    Fan, G.
    Gao, L.
    Li, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/110664.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quinoline adsorption
    coking coal
    kinetics
    adsorption activation energy
    coal adsorption
    Opis:
    Basing on the concept of circular economy, a novel method of industrial organic wastewater treatment by using adsorption on coal is introduced. Coal is used to adsorb organic pollutants from coking wastewaters. After adsorption, the coal would be used in its original purpose, as its value was not reduced and the pollutant was reused. Through the systemic circulation of coking wastewater zero emissions can be achieved. Lignite, coking coal and anthracite were used as adsorbents in batch experiments. The quinoline removal efficiency of coal adsorption was investigated. Both the coking coal and anthracite exhibited properties well-suited for quinoline adsorption removal. The experimental data were fitted to the pseudo-first- order and pseudo-second-order kinetic equations as well as intraparticle diffusion and Bangham models. An attempt was made to find the rate-limiting step involved in the adsorption processes. Both boundary-layer diffusion and intraparticle diffusion are likely involved in the rate-limiting mechanisms. Effect of pH on coal adsorptions by coking coal was investigated. The process of quinoline adsorption on coal was researched. The coal adsorption method for removing refractory organic pollutants is a great hope for achieving wastewater zero emission for coking plants.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 397-408
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrogen sulfide modulates gastric acid secretion in rats via involvement of substance P and nuclear factor-kappaB signaling
    Autorzy:
    Sun, H.-Z.
    Gong, X.-Y.
    Wu, L.
    Wang, X.-X.
    Nie, Y.-N.
    Shang, R.
    Wang, H.
    Li, Y.-C.
    Sun, Q.-F.
    Gao, P.-F.
    Bi, J.-X.
    Powiązania:
    https://bibliotekanauki.pl/articles/69523.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Fizjologiczne
    Tematy:
    hydrogen sulphide
    gastric acid secretion
    rat
    nuclear factor-kappaB
    substance P
    transient receptor potential vanilloid type 1
    neurokinin-1
    Źródło:
    Journal of Physiology and Pharmacology; 2018, 69, 3
    0867-5910
    Pojawia się w:
    Journal of Physiology and Pharmacology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on relationship between carbon dioxide emissions, imports, exports, and population in China
    Autorzy:
    Jin, Q.-Y.
    Zhang, J.
    Gao, Y.-Q.
    Su, X.
    Fu, Y.-S.
    Powiązania:
    https://bibliotekanauki.pl/articles/207318.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    population statistics
    carbon dioxide
    global warming
    carbon dioxide emissions
    total carbon
    statystyki ludności
    dwutlenek węgla
    globalne ocieplenie
    emisja dwutlenku węgla
    węgiel całkowity
    Opis:
    Empirical relationships between carbon dioxide emission, imports, exports, and population have been investigated. An empirical model with carbon dioxide emissions, structure and scale of import and exports, populations was built Using ridge regression analysis and observed data from 1985 to 2006 in China, we examined the relationship between each part of carbon dioxide emission and corresponding coefficients, including GIV (gross imports value), GXV (gross exports value), and P (populations). The results have shown that the increasing trend in TCOE (total carbon dioxide emissions) was determined by the exports, while its standard level is determined by population. Increasing the imports may reduce TCOE. Considering working to expand economy, the best ways for China to reduce TCOE are to introduce advanced technology and take actions to guarantee strict execution of cut-emission policy. Although the increasing imports also can reduce TCOE, it is not reasonable for the global cut-emission policy. To control population is not applicable as the immense population base, so government's publicity for low-carbon live is a necessary and feasible way to reduce carbon dioxide emission.
    Źródło:
    Environment Protection Engineering; 2014, 40, 2; 75-85
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geometric Model for Multi-axial Warp-knitted Fabric Based on NURBS
    Model geometryczny wieloosiowej dzianiny osnowowej oparty na krzywych NURBS
    Autorzy:
    Jiang, G
    Gu, L
    Cong, H L
    Miao, X H
    Zhang, A
    Gao, Z
    Powiązania:
    https://bibliotekanauki.pl/articles/232674.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    warp knitting
    multi-axial
    geometric model
    3D simulation
    fibre volume fraction
    struktura systemu przędz
    modelowanie przędz
    osnowowe dzianiny wieloosiowe
    3D przędz
    Opis:
    Based on studying the constitution of yarn system and the geometric modality of relevant yarns in the multi-axial warp-knitted structure, 3D solid models of the loop yarns, insertion yarns and chopped strand mat in modern multi-axial warp-knitted fabrics were built to reflect the geometric structures of the three items by using NURBS curves and the principle of curved surfaces. Besides, OpenGL was employed to explore the corresponding 3D computer simulation system under the condition of VC++.NET, which could simulate the geometric model of multi-axial warp-knitted fabric. Meanwhile, through the selection of the unit cell of the fabric, the unit cell model of modern multi-axial warp-knitted fabric with chopped strand mat was developed and the relation between geometric parameters and process variables was deduced. The theoretical fibre volume fraction formula of modern multi-axial warp-knitted fabric with chopped strand mat was obtained as well. Furthermore, by using different specifications of fabric as samples, theoretical and experimental values of the fibre volume fraction were compared. The results revealed that there was good agreement between the theoretical and experimental values, which proved that the model was scientific and practical.
    Na podstawie badań struktury systemu przędz i geometrycznej modalności odpowiednich przędz w wieloosiowej dzianej strukturze osnowowej opracowano modele brył 3D przędz pętli, przędz wprowadzanych i struktur z włókien odcinkowych we współczesnych wieloosiowych dzianinach osnowowych w celu zobrazowania ich geometrycznych struktur dzięki zastosowaniu krzywych NURBS i reguł dotyczących zakrzywionych powierzchni. Oprócz tego zastosowano program OpenGL dla zbadania systemu symulacji komputerowej 3D przy warunkach VC++.NET, co pozwala na symulację geometrycznego modelu wieloosiowych dzianin osnowowych. Jednocześnie dzięki selekcji komórki podstawowej dzianiny opracowano model takiej komórki podstawowej dla konfiguracji wcześniej opisanej. Określono również zależności pomiędzy parametrami geometrycznymi a zmiennymi procesowymi. Uzyskano teoretyczną objętość włókien, następnie korzystając ze specyfikacji różnego rodzaju próbek określono zależności pomiędzy teoretycznymi i eksperymentalnymi wartościami objętości poszczególnych frakcji włókien. Wyniki wykazały, że istnieje zgodność pomiędzy teoretycznymi i eksperymentalnymi wartościami, co oznacza, że opracowany model jest naukowo uzasadniony i możliwy do stosowania w praktyce.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2014, 3 (105); 91-97
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Serological surveillance of avian influenza virus and canine distemper virus in captive Siberian Tigers in Northeastern China
    Autorzy:
    Wang, K.
    Wang, H.
    Feng, N.
    Zhao, Y.
    Gao, Y.
    Hu, G.
    Xia, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087698.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    influenza A virus
    canine distemper virus
    serological
    Siberian Tiger
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 3; 491-495
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Visual Detection Method of Longitudinal Crack Based on Computer Image Processing During Slab Continuous Casting
    Autorzy:
    Liu, Y.
    Wang, X.
    Sun, Y.
    Du, F.
    Gao, Y.
    Wang, F.
    Wang, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/351636.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    longitudinal crack
    visual detection
    image processing
    continuous casting
    Opis:
    Based on the mould temperature measured by thermocouples during slab continuous casting, a difference of temperature thermograph is developed to detect slab cracks. In order to detect abnormal temperature region caused by longitudinal crack, the suspicious regions are extracted and divided by virtue of computer image processing algorithms, such as threshold segmentation, connected region judgement and boundary tracing. The abnormal regions are then determined and labeled with the eight connected component labeling algorithm. The boundary of abnormal region is also extracted to depict characteristics of longitudinal crack. Based on above researches, longitudinal crack with abnormal temperature region can be detected and is different from other abnormalities. Four samples of temperature drop are picked up to compare with longitudinal crack on the abnormal region formation, length, width, shape, et al. The results show that the abnormal region caused by longitudinal crack has a linear and vertical shape. The height of abnormal region is more than the width obviously. The ratio of height to width is usually larger than that of other temperature drop regions. This method provides a visual and easy way to detect longitudinal crack and other abnormities. Meanwhile it has a positive meaning to the intelligent and visual mould monitoring system of continuous casting.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 673-680
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biological characteristics of a new antibacterial peptide and its antibacterial mechanisms against Gram-negative bacteria
    Autorzy:
    Pei, Z.
    Ying, X.
    Tang, Y.
    Liu, L.
    Zhang, H.
    Liu, S.
    Zhang, D.
    Wang, K.
    Kong, L.
    Gao, Y.
    Ma, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087656.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    antimicrobial peptide
    biological characteristics
    antibacterial mechanism
    Gram-negative bacteria
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 3; 533-542
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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