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Tytuł:
Sharp Upper Bounds on the Clar Number of Fullerene Graphs
Autorzy:
Gao, Yang
Zhang, Heping
Powiązania:
https://bibliotekanauki.pl/articles/31342425.pdf
Data publikacji:
2018-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
fullerene
Clar number
Clar set
leapfrog transformation
Opis:
The Clar number of a fullerene graph with $n$ vertices is bounded above by $ \floor { n // 6 } − 2 $ and this bound has been improved to $ \floor{ n//6 } − 3 $ when $n$ is congruent to 2 modulo 6. We can construct at least one fullerene graph attaining the upper bounds for every even number of vertices $ n \ge 20 $ except $n = 22 $ and $ n = 30 $.
Źródło:
Discussiones Mathematicae Graph Theory; 2018, 38, 1; 155-163
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on leaching kinetics of laterite ore using hydrochloric acid
Autorzy:
Li, Jinhui
Xu, Zhifeng
Wang, Ruixiang
Gao, Yang
Yang, Yang
Powiązania:
https://bibliotekanauki.pl/articles/110911.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nickel laterite
hydrochloride acid
kinetics analysis
hydrometallurgy
leaching mechanism
Opis:
The process of atmosphere-pressure acid leaching of laterites has attracted considerable attention in the nickel industry in recent years. However, the leaching kinetics of laterite using hydrochloride acid has not yet been fully researched. In this paper, the mineral analysis of the ore was carried out, and the leaching mechanism of different minerals at different time was studied comprehensively. The kinetics analysis of the leaching process of nickel, cobalt and manganese showed that the kinetics model of diffusion controlling was suitable and could be described by the linear equation, 1-3(1-a)2/3+2(1-a)=k2t. Based on the linear equation and the Arrhenius equation, the values of activation energy of metal leaching can be deduced (11.56 kJ/mol for nickel, 11.26 kJ/mol for cobalt and 10.77 kJ/mol for manganese). Study of leaching mechanism shows that the order of these minerals dissolution is: goethite, lizardite, magnetite and hematite. Due to the original or product of silica, magnetite, hematite and talc, they can form the solid film which hinders the leaching of valuable metals. Thus, the diffusion controlling step is inner diffusion, namely solid film diffusion controlling.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 3; 711-720
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ABA alleviated soybean seedling stress exposed to UV-C radiation
Autorzy:
Yang, L.
Gao, N.
Yang, Y.
Zhang, Y.
Gao, J.
Sun, Y.
Powiązania:
https://bibliotekanauki.pl/articles/2082655.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
ultraviolet-C
ABA
active oxygen metabolism
flavonoids
soybean
Opis:
In order to understand the roles of abscisis acid in soybean exposed to UV-C radiation, soybean seedlings were exposed to UV-C radiation and ABA was applied. The chlorophyll content, active oxygen metabolism and flavonoids content of soybean seedlings were investigated. The present study revealed that UV-C radiation significantly attenuated the chlorophyll content and suppressed PSII activity. It was observed that the contents of H2O2, malondialdehyde and O2 - were markedly increased, and the activities of antioxidant enzymes such as superoxide dismutase, peroxidase and catalase were enhanced, so were the flavonoids content, whereas the seedling height and biomass were significantly reduced. ABA application improved the activities of superoxide dismutase, peroxidase, catalase and the contents of flavonoids, decreased the contents of H2O2, MDA and O2 -, and also increased the chlorophyll content and enhanced PSII performance, thus enhancing biomass accumulation. The results suggested that ABA alleviated UV-C damage to soybean seedlings by reducing ROS generation and enhancing antioxidase activity. The isoflavones daidzin and genistein were significantly responsive to UV-C.
Źródło:
International Agrophysics; 2020, 34, 1; 115-121
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Airflow Characteristics during the Rotor Spun Composite Yarn Spinning Process
Charakterystyka przepływu powietrza podczas przędzenia przędzy kompozytowej
Autorzy:
Yang, R.
Gao, W.
Xue, Y.
Powiązania:
https://bibliotekanauki.pl/articles/232164.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
rotor-spun composite yarn
simulation
airflow
performance
przędza kompozytowa
symulacja
przepływ powietrza
Opis:
Rotor spun composite yarn shows compound performances when combined with staple fibres and filaments, such as excellent hand feeling as well as extreme elasticity and strength. Air characteristics including pressure and speed are critical factors of the rotor spun composite yarn spinning process. In this paper, air flow characteristics in a rotor composite yarn spinning unit are simulated and analysed by Ansys, and then verified by experiments. The results show that with the same spinning conditions, static pressure within the filament guide tube is lowest: -9 kPa and in rotor around -5 kPa. The speed of the airstream accelerates from the transfer channel inlet to the outlet, and reaches the largest value of 386 m/s at the outlet. As the rotor speed increases, the airflow velocity increases; the static pressure decreases; the breaking strength and CV of the composite yarn increase, and the breaking elongation and hairiness decrease according to the experiment results.
Przędza kompozytowa charakteryzuje się doskonałym chwytem, a także wyjątkową elastycznością i wytrzymałością. Charakterystyka przepływu powietrza, w tym ciśnienie i prędkość, są czynnikami decydującymi o przędzeniu przędzy kompozytowej na przędzarce rotorowej. W artykule przeprowadzono stymulację i analizę charakterystyk przepływu powietrza, a następnie wyniki zweryfikowano eksperymentalnie. Prędkość strumienia powietrza przyspiesza od wlotu kanału przenoszenia do wylotu i osiąga największą wartość 386 m/s na wylocie. Gdy prędkość wirnika wzrasta, prędkość przepływu powietrza również wzrasta, a ciśnienie statyczne maleje, natomiast wytrzymałość na zerwanie przędzy kompozytowej wzrasta.
Źródło:
Fibres & Textiles in Eastern Europe; 2017, 5 (125); 13-17
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Hybrid Density Functional Study on PuN
Autorzy:
Yang, Rong
Tang, Bin
Gao, Tao
Powiązania:
https://bibliotekanauki.pl/articles/1029819.pdf
Data publikacji:
2018-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
plutonium mononitride
density-functional theory
hybrid functional
Opis:
The structural, magnetic, electronic, dynamical and thermodynamic properties of PuN have been studied within the frameworks of the density-functional theory, DFT+U and hybrid DFT. The calculations have been performed using the full-potential-linearized augmented plane-wave method. The ferromagnetic and antiferromagnetic configurations are considered in this work. The lattice constants, bulk moduli, densities of states, and thermodynamic data have been computed and compared to available experimental data and other theoretical calculations published in the literature. Total energy results obtained with DFT+U and hybrid DFT indicate that the ground state of PuN is antiferromagnetic, in agreement with experiment. The chemical bonds between Pu and N have a mixture of covalent and ionic components, but the ionic character is stronger than covalent character. The phonon dispersion curves and the optical-mode frequencies are also reported. At last, the effect of spin-orbit coupling on the structural, magnetic, and electronic properties of PuN has been discussed.
Źródło:
Acta Physica Polonica A; 2018, 133, 1; 32-38
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite Element Method for Static Problems of Cubic Quasicrystals
Autorzy:
Yang, L.
He, F.
Gao, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1202985.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.44.Br
Opis:
We put forward a finite element method for static problems of cubic quasicrystals by variation of a suitable general potential functional. As an example we study a quasicrystal column containing a penny-shaped crack. The comparison with analytical results shows that the precision and efficiency of the numerical solution are satisfactory. The procedure can be used to solve more complicated boundary value problems and can be extended towards more sophisticated methods of crack tip loading analysis.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 471-473
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
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:
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:
Electric-Elastic Field Induced by a Straight Dislocation in One-Dimensional Quasicrystals
Autorzy:
Yang, L.
Gao, Y.
Pan, E.
Waksmanski, N.
Powiązania:
https://bibliotekanauki.pl/articles/1202982.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.44.Br
61.72.Lk
62.20.D-
Opis:
By using the generalized Stroh formalism, the electric-elastic field induced by a straight dislocation parallel to a periodic axis of a one-dimensional quasicrystal is obtained. The derivation is concise and the solution is in an exact closed form. As an illustration, the electric-elastic fields around a straight dislocation in a one-dimensional hexagonal quasicrystal are studied. Besides the interesting numerical results presented, the generalized Stroh formalism can be applied to more complicated dislocation problems in quasicrystals.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 467-470
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free vibration and buckling analysis of composite laminated shells using the refined zigzag theory
Autorzy:
Zhang, Haibo
Gao, Yihang
He, Dan
Yang, Wanli
Powiązania:
https://bibliotekanauki.pl/articles/2104757.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
composite
shell
buckling
free vibration
refined zigzag theory
Opis:
In this study, a new composite laminated shell model is proposed for free vibration and stability analysis based on the refined zigzag theory (RZT). In contrast to the published shell models based on the first-order shear deformation theory (FSDT), piecewise-linear zigzag functions are utilized to provide a more realistic representation of deformation states of a transverse shear-flexible shell. In the present formulation, the governing equations and boundary conditions of composite laminated shells are established by d’Alembert’s principle to obtain natural frequencies and critical buckling loadings. In order to evaluate the effectiveness and performance of the present new model for composite laminated shells, examples of free vibration and buckling analysis are carried out for cylindrical and spherical shells involving different lamination schemes and design parameters. The results are compared with the three dimensional (3D) exact, first-order and some high-order solutions in the literature. Numerical results show that the present model not only has high accuracy but also has superior computational efficiency in comparison with high-order models, such that it may show a great potential in engineering applications.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 435--448
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
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:
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:
Effect of Methyl Silicone Oil to Moisture Resistance of Sodium Silicate Sands by Microwave Hardening
Autorzy:
Wang, Huafang
Gao, Xiang
Yang, Lei
He, Wei
Lu, Jijun
Powiązania:
https://bibliotekanauki.pl/articles/2126894.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sodium silicate sands
microwave hardening
methyl silicon oils
moisture absorption
piaski sodowo-krzemianowe
hartowanie mikrofalowe
olej metylosilikonowy
wchłanianie wilgoci
Opis:
The sodium silicate sands hardened by microwave have the advantages of high strength, fast hardening speed and low residual strength with the lower addition of sodium silicate. However, the sodium ion in the sands will absorb moisture from the atmosphere, which would lead to lower storing strength, so the protection of a bonding bridge of sodium silicate between the sands is crucial. Methyl silicone oil is a cheap hydrophobic industrial raw material. The influence of the addition amount of methyl silicone oil modifier on compressive strength and moisture absorption of sodium silicate sands was studied in this work. The microscopic analysis of modified before and after sodium silicate sands has been carried on employing scanning electron microscopy(SEM) and energy spectrum analysis(EDS). The results showed that the strength of modified sodium silicate sands was significantly higher than that of unmodified sodium silicate sands, and the best addition of methyl silicone oil in the quantity of sodium silicate was 15%. It was also found that the bonding bridge of modified sodium silicate sands was the density and the adhesive film was smooth, and the methyl silicone oil was completely covered on the surface of the sodium silicate bonding bridge to protect it.
Źródło:
Archives of Foundry Engineering; 2022, 22, 1; 43--47
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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