Skocz do pozycji: 1.

Tytuł:

Finite element analysis of a superelastic shape memory alloy considering the effect of plasticity

Autorzy:

Jiang, X.
Li, B.

Powiązania:

https://bibliotekanauki.pl/articles/281467.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

SMAs
superelasticity
plasticity
constitutive law
finite element analysis

Opis:

In the present study, a shape memory alloy (SMA) phenomenological constitutive model is proposed that is capable of describing SMA superelastic behavior and the plasticity effect. The phase transformation constitutive model, by using strain and temperature as control variables to judge the phase transformation points in order to avoid the complexity of transformation correction, incorporates plasticity described by the von Mises isotropic hardening model. Further, the proposed model is implemented into the finite element package ANSYS by the user subroutine USERMAT. The results produced by the proposed model of simulated superelastic and plasticity behavior are compared with experimental data taken from the literature.

Źródło:

Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1355-1368
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Establishment of motion model for wave capture buoy and research on hydrodynamic performance of floating-type wave energy converter

Autorzy:

Gao, H.
Li, B.

Powiązania:

https://bibliotekanauki.pl/articles/259950.pdf

Data publikacji:

2015

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

wave energy
linear wave
floating-type
hydrodynamic
absorption efficiency

Opis:

Floating-type wave energy converter has the advantages of high wave energy conversion efficiency, strong shock resistance ability in rough sea and stable output power. So it is regarded as a promising energy utilization facility. The research on hydrodynamic performance of wave capture buoys is the precondition and key to the wave energy device design and optimization. A simplified motion model of the buoys in the waves is established. Based on linear wave theory, the equations of motion of buoys are derived according to Newton’s second law. The factors of wave and buoys structural parameters on wave energy absorption efficiency are discussed in the China’s Bohai Sea with short wave period and small wave height. The results show that the main factor which affects the dynamic responses of wave capture buoys is the proximity of the natural frequency of buoys to the wave period. And the incoming wave power takes a backseat role to it at constant wave height. The buoys structural parameters such as length, radius and immersed depth, influence the wave energy absorption efficiency, which play significant factors in device design. The effectiveness of this model is validated by the sea tests with small-sized wave energy devices. The establishment methods of motion model and analysis results are expected to be helpful for designing and manufacturing of floating-type wave energy converter.

Źródło:

Polish Maritime Research; 2015, S 1; 106-111
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Fiber diameter influence on optical transport of dielectric particles along subwavelength optical fibers

Autorzy:

Zhang, Y.
Lei, H.
Li, B.

Powiązania:

https://bibliotekanauki.pl/articles/173195.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

optical transport
optical scattering force
optical gradient force
subwavelength optical fiber
evanescent field

Opis:

We investigate a fiber diameter influence on optical transport of dielectric particles along subwavelength optical fibers using a near infrared laser of 1.55 μm wavelength. Theoretical analysis indicates that at 1.55 μm, the evanescent field at the fiber surface increases at first and then decreases with an increase of the fiber diameter from 600 nm to 1.6 μm, exhibiting a maximum at the fiber diameter of 950 nm. Based on three-dimensional finite-difference time-domain simulations, optical scattering forces acted on the dielectric particles and transport velocities of the particles were calculated for two fibers in the diameters of 930 nm and 1.5 μm. To support the theoretical analysis, experiments were performed using the two fibers to transport SiO2 particles (sizes of 530 nm and 1.5 μm) and TiO2 particles (size of 1.5 μm). The results show that with the same laser power launched into the two fibers, larger transport velocities can be obtained along the 930 nm diameter fiber.

Źródło:

Optica Applicata; 2013, 43, 4; 707-718
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

On-the-fly diagnosability analysis of bounded and unbounded labeled Petri nets using verifier nets

Autorzy:

Li, B.
Khlif-Bouassida, M.
Toguéyni, A.

Powiązania:

https://bibliotekanauki.pl/articles/330272.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

fault diagnosis
discrete event system
labeled Petri nets
on-the-fly diagnosability analysis
verifier nets
diagnostyka błędu
układ zdarzeń dyskretnych
sieci Petriego

Opis:

This paper considers the problem of diagnosability analysis of discrete event systems modeled by labeled Petri nets (LPNs). We assume that the LPN can be bounded or unbounded with no deadlock after firing any fault transition. Our approach is novel and presents the on-the-fly diagnosability analysis using verifier nets. For a given LPN model, the verifier net and its reachability graph (for a bounded LPN) or coverability graph (for an unbounded LPN) are built on-the-fly and in parallel for diagnosability analysis. As soon as a diagnosability decision is established, the construction is stopped. This approach achieves a compromise between computation limitations due to efficiency and combinatorial explosion and it is useful to implement an engineering approach to the diagnosability analysis of complex systems.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2018, 28, 2; 269-281
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Mild Method to Synthesize TATB by Amination of 1,3,5-Trialkoxy-2,4,6-Trinitrobenzene under Phase Transfer Catalysis Conditions

Autorzy:

Chang, T.
Li, B.
Chen, L.
Ge, L.
Lu, M.

Powiązania:

https://bibliotekanauki.pl/articles/358103.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

TATB
phase transfer catalysis
atmospheric amination reaction

Opis:

Nucleophilic amination, as a vital step in the synthesis of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) using 1,3,5-trialkoxy-2,4,6-trinitrobenzene (TORTNB) and aqueous ammonia as the starting materials and catalyzed by phase transfer catalysis (PTCs) under mild conditions is described. Various phase transfer catalysts, such as crown ethers, tertiary amines, quaternary ammonium salts, poly ethers and cyclodextrin, and various experimental parameters, such as no. of equivalents of PTC, mole ratio of ammonium hydroxide to the starting material, reaction time, reaction temperature and cycle times of the organic phase were investigated. The crown ethers, especially 18-crown-6, show good catalytic activity and re-usability for the amination of 1,3,5-triethoxy-2,4,6-trinitrobenzene giving a yield of 96.52%. This makes for a safe process and suitable for scale-up, because the reactions are carried out under atmospheric conditions. The material synthesised by the new system was characterized by DSC, SEM and LPS.

Źródło:

Central European Journal of Energetic Materials; 2017, 14, 1; 47-59
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Calculating study of the turbine at last stage flow field in the small volume flow condition

Autorzy:

Jiang, T.
Jin, J.
Wang, Z.
Cao, L.
Li, B.

Powiązania:

https://bibliotekanauki.pl/articles/258680.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

turbine
small volume flow
flow model
backflow

Opis:

Based on basic equation and boundary layer theory of pneumodynamics, the thesis conducts numerical modeling and theoretical analysis on the last stage of turbine characteristics at a small volume flow by using FLUENT, gives an emphasized analysis on the position of first occurrence of backflow and its expansion direction and comes up with flow structure of the turbine flow field at last stage in the small volume flow condition. In connection with specific experiments, it puts forward the flow model of backflow occurring in the last stage field and the solution to the model. The flow field at last stage for a 100MW turbine in the small volume flow condition that is calculated by using the model is basically in conformity to the actual result.

Źródło:

Polish Maritime Research; 2017, S 3; 23-27
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Extraction of rubidium and cesium from brine solutions using a room temperature ionic liquid system containing 18-crown-6

Autorzy:

Huang, D.
Zheng, H.
Liu, Z.
Bao, A.
Li, B.

Powiązania:

https://bibliotekanauki.pl/articles/779994.pdf

Data publikacji:

2018

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Rubidium
Cesium
Ionic liquid
18-crown-6
Solvent extraction

Opis:

Application of 1-butyl-3-metyhlimidazaolium hexafl uorophosphate ([C4mim][PF₆ ]), in the extraction of rubidium and cesium from brine solutions using 1,4,7,10,13,16-hexaoxacyclooctadecane (18C6) as extractant was investigated. Parameters that affect the extraction including pH of aqueous phase, equilibration time, dosage of the ionic liquid, phase ratio, concentration of 18C6 were studied. Under the optimal conditions, the single extraction effi ciency of rubidium ions and cesium ions were up 84.11% and 94.99%, respectively. The stripping of alkali metal ions from the loaded organic phase with different stripping agents and concentrations were also investigated. The initial value of the K/Cs and K/Rb ratios were 93.0 and 104.3, respectively, which have dropped 91.21% and 88.01%, respectively, after the extraction and stripping experiments. It was taken a big step in the separation and enrichment of cesium (rubidium) ion and potassium ion. The extraction mechanism was revealed most likely to be a cation exchange mode in this system.

Źródło:

Polish Journal of Chemical Technology; 2018, 20, 2; 40-46
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Design of brake force distribution model for front-and-rear-motor-drive electric vehicle based on radial basis function

Autorzy:

Sun, B.
Zhang, T.
Gao, S.
Ge, W.
Li, B.

Powiązania:

https://bibliotekanauki.pl/articles/224023.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

electric vehicle
motor drive
front-and-rear-motor-drive
brakes force
brake force distribution
pojazd elektryczny
napęd silnikowy
napęd silnikowy przedni i tylny
siła hamowania
rozkład siły hamowania

Opis:

To achieve high-efficiency and stable brake of a front-and-rear-motor-drive electric vehicle (FRMDEV) with parallel cooperative braking system, a multi-objective optimal model for brake force distribution is created based on radial basis function (RBF). First of all, the key factors, which are the coefficient of brake force distribution between the front and rear shafts, the coefficient of brake force distribution at wheels, the coefficient of regenerative brake force distribution between front and rear axles, that influence the brake stability and energy recovery of the FRMDEV are analyzed, the fitness functions of brake stability and energy recovery are established. Secondly, the maximum allowed regenerative brake torque influenced by the state of charge of battery is confirmed, the correction model of the optimal distribution coefficient of regenerative brake force is created according to motor temperatures. Thirdly, based on HALTON sequence method, a two-factor database, vehicle velocity and brake strength, that characterizes vehicle operation is designed. Then an off-line response database of the optimal brake force distribution is established with the use of particle swarm optimization (PSO). Furthermore, based on hybrid RBF, the function model of the factor database and the response database is established, and the accuracy of the model is analyzed. Specially, the correlation coefficient is 0.995 and the predictive error variance is within the range between 0.000155 and 0.00018. The both indicate that the multi-objective distribution model has high accuracy. Finally, a hardware-in-loop test platform is designed to verify the multi-objective optimal brake force distribution model. Test results show that the real-time performance of the model can meet the demand of engineering application. Meanwhile, it can achieve both the brake stability and energy recovery. In comparison with the original brake force distribution model based on the rule algorithm, the optimized one proposed in this paper is able to improve the energy, recovered into battery, by 14.75%.

Źródło:

Archives of Transport; 2018, 48, 4; 87-98
0866-9546
2300-8830

Pojawia się w:

Archives of Transport

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Model of line-of-sight ultraviolet propagation

Autorzy:

Li, B.
Wang, Hongbo
Mao, Z.
Dong, Z.
Zhang, X.

Powiązania:

https://bibliotekanauki.pl/articles/174219.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

ultraviolet communication
bipyramid model
scattering characteristic
line-of-sight (LOS) communication mode

Opis:

The traditional line-of-sight ultraviolet model cannot serve better for link performance study for the reason that the scattering characteristic is often ignored in the modelling process. Therefore, a line-of-sight ultraviolet bipyramid model in combination with transceiver full beam angles and geometrical relationship of the transceiver field of view intersection is established. The theoretical rationality of the bipyramid model in comparison with a traditional line-of-sight model is demonstrated by the classically analytical model for line-of-sight scenario. Based on a bit error rate requirement of voice communication, the effects of transmitting power versus range for three line-of-sight ultraviolet communication modes are further analyzed.

Źródło:

Optica Applicata; 2014, 44, 4; 601-610
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Real-time Segmentation of Yarn Images Based on an FCM Algorithm and Intensity Gradient Analysis
Segmentacja obrazu przędzy oparta na algorytmie FCM i analizie gradientu intensywności

Autorzy:

Li, Z.
Pan, R.
Wang, J.
Wang, Z.
Li, B.
Gao, W.

Powiązania:

https://bibliotekanauki.pl/articles/233569.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

real-time segmentation
image processing
yarn evenness
FCM algorithm
gradient analysis
segmentacja w czasie rzeczywistym
przetwarzanie obrazu
algorytm FCM
analiza gradientu

Opis:

This paper presents a new method for real-time segmentation of yarn images which are captured by a real-time image acquisition device. The first frame of the images is clustered by the local average intensity and entropy of the image based on the FCM (Fuzzy C-means) algorithm to obtain a segmentation threshold value. The pixels with an intensity below the threshold value in each column of the image are convolved with a convolve template to construct an intensity gradient curve. The points of maximum value and minimum value in the curve are considered as the upper and lower edge points of yarn. A robust real-time segmentation algorithm of yarn images is obtained for evaluating yarn diameter more precisely. Finally two indices of SE (Segmentation Error) in % and ADE (Average Diameter Error) in % are proposed to evaluate the segmentation method, which is then compared with the manual method.
Artykuł dotyczy oceny przeprowadzonej w czasie rzeczywistym segmentacji obrazów w oparciu o rozmyty algorytm C-średnich i analizę intensywności gradientu. Zaproponowano metodę segmentacji obrazów przędzy mającą na celu zwiększenie dokładności pomiarów jej średnicy, a w zamierzeniach wpłynięcie na zwiększenie dokładności oceny jej nierównomierności. W tym celu zaprojektowano stanowisko badawcze, umożliwiające rejestrację obrazów przędzy wykonaną w czasie rzeczywistym, z bardzo dużą częstotliwością rejestracji kadrów zdjęć. Na tej podstawie przeprowadzono obliczenia obejmujące między innymi minimalizację rozmytej funkcji celu, lokalną charakterystykę intensywności obrazu, a także jednowymiarowy splot wykorzystane do wykrywania krawędzi rozpatrywanej przędzy. Uzyskane rezultaty proponowanej metody skonfrontowano z rezultatami przewidywanymi za pośrednictwem tradycyjnych metod. W szczególności w celach porównawczych uwzględniono progowanie Otsu i grupowanie za pośrednictwem algorytmu FCM, a także Region Growing Algorithm.

Źródło:

Fibres & Textiles in Eastern Europe; 2016, 4 (118); 45-50
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Study of Cotton Matured Fibre Quality and the Super-Molecular Structure in Upland Cotton RILs
Analiza jakości dojrzałych włókien bawełny Upland i jej struktury nadcząsteczkowej

Autorzy:

Wang, Y.
Li, C
Shang, H
Li, B
Liu, A
Yuan, Y

Powiązania:

https://bibliotekanauki.pl/articles/231848.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

upland cotton
recombinant inbred lines
fibre super-molecular structure
fibre quality
dojrzałe włókna bawełny
bawełna Upland
zmodyfikowana genetycznie bawełna
cechy włókniste bawełny
super-molekularna struktura włókien
jakość włókna

Opis:

A RIL(recombinant inbred lines) population with 196 F6:9 lines was developed from an F2 population of upland cotton (Gossypium hirsutum L.) cross of sGK9708×0-153. sGK9708 is a commercial transgenic variety with Bt+CpTI genes resistant to budworm and 0-153 with high fibre quality. Five materials with high fibre strength and five materials with low fibre strength from the recombinant inbred lines were researched [1]. Ten materials of super-molecular structure and fibre quality were studied by X-ray diffraction and the HVI900 technique. The results indicated that cotton matured fibre quality should mainly depend on the decrease in the orientational parameter in the crystalline section, especially the orientational separate and orientational distribution angles. The correlation of fibre maturity, linear density and the fibre super-molecular structure is an innovation in the study. Studies on the correlation of cotton fibre quality and the fibre super-molecular structure provide a scientific basis for the improvement cotton fibre quality.
Artykuł dotyczy badań jakości dojrzałych włókien bawełny amerykańskiej Upland i jej struktury nadcząsteczkowej. Uzyskano zmodyfikowany genetycznie gatunek bawełny amerykańskiej Upland za pośrednictwem sztucznego samozapylenia bawełny wykazującej cechy włókniste (linii wsobnej). Dla uzyskanych w opisany sposób włókien bawełny przeprowadzono wszechstronne badania właściwości fizycznych, a także struktury nadcząsteczkowej. Uzyskane wyniki badań skonfrontowano z właściwościami fizycznymi i strukturą nadczasteczkową tradycyjnej bawełny amerykańskiej Upland posiłkując się w tym celu analizą korelacyjną.

Źródło:

Fibres & Textiles in Eastern Europe; 2014, 5 (107); 28-33
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

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

/5

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Skocz do pozycji: 13.

Tytuł:

Growth of β-$Ga_2O_3$ Nanorods and Photoluminescence Properties

Autorzy:

Zhang,, S.
Zhuang, H.
Xue, C.
Li, B.
Shen, J.
Wang, D.

Powiązania:

https://bibliotekanauki.pl/articles/1814023.pdf

Data publikacji:

2007-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.65.-k
79.60.Jv
81.15.Cd

Opis:

β-$Ga_2O_3$ nanorods were successfully fabricated through annealing $Ga_2O_3$/Mo films deposited on the Si (111) substrate by radio frequency magnetron sputtering technique. The morphology and structure of the as-synthesized nanorods were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and energy dispersive X-rays spectroscopy. The results show that the formed nanorods are single-crystalline $Ga_2O_3$ with monoclinic structure. The diameters of nanorods are 200 nm and lengths typically up to several micrometers. A photoluminescence spectrum at room temperature under excitation at 325 nm exhibits two strong blue-light peaks located at about 413.0 nm and 437.5 nm, attributed to the recombination of bound electron-hole exciton in β-$Ga_2O_3$ single crystal. The growth process of the β-$Ga_2O_3$ nanorods is probably dominated by conventional vapor-solid mechanism.

Źródło:

Acta Physica Polonica A; 2007, 112, 6; 1195-1201
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Theoretical analysis of a hollow laser beam transmitting in an off-axis Cassegrain optical antenna system

Autorzy:

Mi, C
Jiang, P
Yang, H.
Ke, S
Li, B
Liu, J.

Powiązania:

https://bibliotekanauki.pl/articles/174358.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

Cassegrain optical antenna
off-axis hollow laser beam
receiving efficiency

Opis:

The optical model of a Cassegrain optical antenna with a confocal double-parabolic reflector structure has been designed, and the propagation characteristics of a hollow laser beam, which could avoid the loss of energy caused by the subreflector center reflection in the optical antenna, has been researched in this paper. By detailed analysis and numerical calculations of a receiving Cassegrain antenna with different deflection angles, the coupling efficiency curve and 3-D distributions of the receiving light intensity for different inclined angles have been obtained.

Źródło:

Optica Applicata; 2014, 44, 3; 421-431
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Fabrication of High-Density GaN Nanowires through Ammoniating $Ga_2O_3//Nb$ Films

Autorzy:

Zhuang, H.
Li, B.
Zhang, S.
Zhang, X.
Xue, Ch.
Wang, D.
Shen, J.

Powiązania:

https://bibliotekanauki.pl/articles/1813498.pdf

Data publikacji:

2008-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.65.-k
81.05.Ea
81.15.Cd

Opis:

High-density GaN nanowires were successfully synthesized on Si(111) substrates through ammoniating $Ga_2O_3//Nb$ films under flowing ammonia atmosphere at 950°C. The as-synthesized GaN nanowires are characterized by X-ray diffraction, selected-area-electron diffraction, Fourier transform infrared, scanning electron microscopy, and field-emission transmission electron microscopy. The results show that the synthesized nanowires are single-crystal hexagonal wurtzite GaN with diameters ranging from 30 to 100 nm and lengths up to several microns. The photoluminescence spectra measured at room temperature only exhibit a strong and broad emission peak at 367.8 nm. Finally, the growth mechanism of GaN nanowires is discussed.

Źródło:

Acta Physica Polonica A; 2008, 113, 2; 723-730
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Kinetics of photoelectrocatalytic degradation of diclofenac using N, S co-doped TiO2 nano-crystallite decorated TiO2 nanotube arrays photoelectrode

Autorzy:

Cui, Y.
Deng, X.
Ma, Q.
Zhang, H.
Cheng, X.
Li, X.
Xie, M.
Cheng, Q.
Li, B.

Powiązania:

https://bibliotekanauki.pl/articles/207955.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

effluents
nanotubes
sodium sulfate
sulfur compounds
yarn
photoelectrocatalytic degradation
ścieki
nanorurki
siarczan sodu
związki siarki
przędza

Opis:

As a non-steroidal anti-inflammatory drug, diclofenac, was commonly used as analgesic, antiarthritic and antirheumatic, and has frequently been detected in municipal wastewater treatment plants (MWTPs) effluents and demonstrated to be potentially environmental risk on human beings. In the present study, N, S co-doped TiO₂ nano-crystallites decorated TiO₂ nano-tube arrays (N, S-TiO₂ NCs/TiO₂ NTAs) photoelectrode was used to degrade diclofenac containing wastewater. In addition, the effects of some critical parameters including initial pH, external positive potential, sodium sulfate concentration and initial diclofenac concentration on the photoelectrocatalytic (PEC) degradation of diclofenac containing wastewater and dynamic characteristics were investigated systematically. Results showed that N, S-TiO₂ NCs/TiO₂ NTAs photoelectrode exhibited high PEC efficiency for the degradation of diclofenac, in which the PEC processes fitted well with the Langmuir–Hinshelwood (L–H) model. Furthermore, external additional anions such as Cl^–, ClO^– and NO₃ – played an important role in inhibiting the degradation of diclofenac. Also, the N, S-TiO₂ NCs/TiO₂ NTAs photoelectrode possessed good stability for consecutive applications for degradation of diclofenac, which could potentially be utilized in wastewater treatment.

Źródło:

Environment Protection Engineering; 2018, 44, 2; 117-130
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Quantum Chemical Study of Aminonitrocyclopentanes as Possible High Energy Density Materials (HEDMs)

Autorzy:

Bai, J.
Chi, W. J.
Li, L. L.
Yan, T.
Wen, X. E.
Li, B. T.
Wu, H. S.
Ma, F. L.

Powiązania:

https://bibliotekanauki.pl/articles/358101.pdf

Data publikacji:

2013

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

cyclopentane derivatives
high energy density materials
impact sensitivity
quantum chemistry
DFT
available free space

Opis:

Nitro and amine groups were introduced into the cyclopentane skeleton, and the heats of formation, detonation performance, bond dissociation energies, and impact sensitivity for these aminonitrocyclopentanes were calculated in detail at the B3LYP/6-311G** level. The results show that all of the derivatives have negative heats of formation, which are influenced by the position of the substituent groups. Their stabilities were estimated and analyzed according to their bond dissociation energies and calculated characteristic H50 values. Most of the compounds were found to have a lower impact sensitivity than HMX. Furthermore, the detonation velocities and detonation pressures were predicted via the Kamlet-Jacobs equation. Of all these aminonitrocyclopentanes, E has the best detonation properties (ρ = 2.05 g/cm3, D = 9.11 m/s, P = 39.62 GPa) and can be considered as a candidate high energy density material.

Źródło:

Central European Journal of Energetic Materials; 2013, 10, 4; 467-480
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Experimental and numerical study of the uniaxial compressive stress-strain relationship of a rock mass with two parallel joints

Autorzy:

Xiong, L. X.
Yuan, H. Y.
Zhang, Y.
Zhang, K. F.
Li, J. B.

Powiązania:

https://bibliotekanauki.pl/articles/231076.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

masa skalna łączona
złącze równoległe
siła szczytowa
jointed rock mass
parallel joint
peak strength

Opis:

A “rock bridge”, defined as the closest distance between two joints in a rock mass, is an important feature affecting the jointed rock mass strength. Artificial jointed rock specimens with two parallel joint fractures were tested under uniaxial compression and numerical simulations were carried out to study the effects of the inclination of the rock bridge, the dip angle of the joint, rock bridge length, and the length of joints on the strength of the jointed rock mass. Research results show: (1) When the length of the joint fracture, the length of the rock bridge, and the inclination of the rock bridge stay unchanged, the uniaxial compressive strength of the specimen gradually increases as the inclination of the joint fracture increases from 0° to 90°. (2) When the length of the joint fracture, the length of the rock bridge, and the inclination of the joint fracture stay unchanged, the uniaxial compressive strength of the specimen shows variations in trends with the inclination of the rock bridge increasing from 30° to 150° (3). In the case when the joint is angled from the vertical loading direction, when the dip angle of the joint fracture, the inclination of the rock bridge, and the length of the rock bridge stay unchanged, the uniaxial compressive strength of the specimen gradually decreases with an increasing length of joint fracture. When the dip angle of the joint fracture, the inclination of the rock bridge, and the length of the joint fracture stay unchanged, the uniaxial compressive strength of the specimen does not show a clear trend with an increase of the length of the rock bridge.

Źródło:

Archives of Civil Engineering; 2019, 65, 2; 67-80
1230-2945

Pojawia się w:

Archives of Civil Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Agent-based evacuation in passenger ships using a goal-driven decision-making model

Autorzy:

Ni, B.
Li, Z.
Li, X.

Powiązania:

https://bibliotekanauki.pl/articles/258666.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

ship evacuation analysis
agent-based model
goal-driven decision-making model
social force model
steering behavior

Opis:

A new agent-based model is proposed to support designers in assessing the evacuation capabilities of passenger ships and in improving ship safety. It comprises models for goal-driven decision-making, path planning, and movement. The goal-driven decision-making model determines an agent’s target by decomposing abstract goals into subgoals. The path-planning model plans the shortest path from the agent’s current position to its target. The movement model is a combination of social-force and steering models to control the agent in moving along its path. The utility of the proposed model is verified using 11 tests for passenger ships proposed by the Maritime Safety Committee of the International Maritime Organization.

Źródło:

Polish Maritime Research; 2017, 2; 56-67
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

ISSR analysis of somaclonal variation in callus-derived plants of Amorphophallus rivieri Durieu

Autorzy:

Hu, J.B.
Li, Q.
Li, J.

Powiązania:

https://bibliotekanauki.pl/articles/19740.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

somaclonal variation
callus-derived plant
Amorphophallus rivieri
ISSR technique
regenerated plant
plant cultivation
crop
China

Opis:

This communication reports detection of somaclonal variation among tissue culture-raised plants of Amorphophallus rivieri Durieu, an economically important crop in China, with high content of glucomannan in its corms. A population of regenerated plants was obtained from a single donor plant of A. rivieri via corm organogenesis, and 28 plants were randomly selected as a representative sample and subjected to analysis of somaclonal variation using inter-simple sequence repeat (ISSR) markers. Of the 26 ISSR primers screened, 13 gave distinct and reproducible band patterns, yielding 131 bands with an average of 10.1 bands per primer. Ten primers were polymorphic and generated 16 polymorphic bands with 12.2% mean polymorphism. Based on the ISSR data from the regenerated plants and the donor plant, Jaccard's similarity coefficients were calculated; they ranged from 0.961 to 1.000 with a mean of 0.982. A dendrogram was constructed using the unweighted pair group method with arithmetic mean (UPGMA); it showed that a majority of regenerated plants (including the donor plant) clustered closely, with a mean similarity coefficient of 0.987. Low somaclonal variation observed in the regenerated plants indicates that rapid propagation of A. rivieri via corm organogenesis is a practicable method with a low risk of genetic instability.

Źródło:

Acta Biologica Cracoviensia. Series Botanica; 2011, 53, 1
0001-5296

Pojawia się w:

Acta Biologica Cracoviensia. Series Botanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Research on the maritime communication cryptographic chip’s compiler optimization

Autorzy:

Li, S.
Dai, Z. B.

Powiązania:

https://bibliotekanauki.pl/articles/259239.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

maritime communication encryption system
cryptographic SOC
compiler frontend
loop unrolling

Opis:

In the process of ocean development, the technology for maritime communication system is a hot research field, of which information security is vital for the normal operation of the whole system, and that is also one of the difficulties in the research of maritime communication system. In this paper, a kind of maritime communication cryptographic SOC(system on chip) is introduced, and its compiler framework is put forward through analysis of working mode and problems faced by compiler front end. Then, a loop unrolling factor calculating algorithm based on queue theory, named UFBOQ (unrolling factor based on queue), is proposed to make parallel optimization in the compiler frontend with consideration of the instruction memory capacity limit. Finally, the scalar replacement method is used to optimize unrolled code to solve the memory access latency on the parallel computing efficiency, for continuous data storage characteristics of cryptographic algorithm. The UFBOQ algorithm and scalar replacement prove effective and appropriate, of which the effect achieves the linear speedup.

Źródło:

Polish Maritime Research; 2017, S 2; 50-65
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

An ant-based filtering random-finite-set approach to simultaneous localization and mapping

Autorzy:

Li, D.
Zhu, J.
Xu, B.
Lu, M.
Li, M.

Powiązania:

https://bibliotekanauki.pl/articles/329854.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

simultaneous localization
simultaneous mapping
random finite set
probability hypothesis density
ant colony
lokalizacja jednoczesna
mapowanie jednoczesne
algorytm mrówkowy

Opis:

Inspired by ant foraging, as well as modeling of the feature map and measurements as random finite sets, a novel formulation in an ant colony framework is proposed to jointly estimate the map and the vehicle trajectory so as to solve a feature-based simultaneous localization and mapping (SLAM) problem. This so-called ant-PHD-SLAM algorithm allows decomposing the recursion for the joint map-trajectory posterior density into a jointly propagated posterior density of the vehicle trajectory and the posterior density of the feature map conditioned on the vehicle trajectory. More specifically, an ant-PHD filter is proposed to jointly estimate the number of map features and their locations, namely, using the powerful search ability and collective cooperation of ants to complete the PHD-SLAM filter time prediction and data update process. Meanwhile, a novel fast moving ant estimator (F-MAE) is utilized to estimate the maneuvering vehicle trajectory. Evaluation and comparison using several numerical examples show a performance improvement over recently reported approaches. Moreover, the experimental results based on the robot operation system (ROS) platform validate the consistency with the results obtained from numerical simulations.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2018, 28, 3; 505-519
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Compressive optical image encryption using phase-shifting interferometry on a joint transform correlator

Autorzy:

Li, J.
Jia, B.
Dai, X.
Lei, M.
Yang, C.
Li, H.
Li, R.

Powiązania:

https://bibliotekanauki.pl/articles/174905.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

fully optical system
holographic interferometry
joint transform correlator (JTC)
binary scrambling method
inverse problems

Opis:

A compressive optical image encryption method, which combines compressive sensing with phase-shifting interferometry on a joint transform correlator, is proposed in the fully optical domain. The object image is first permutated using a binary scrambling method. Next, the permutated object field is encrypted and registered as the holograms by phase-shifting interferometry on the joint transform correlator setup. Then, the encrypted images and the key are compressed to the compressed data using single-pixel compressive imaging. The original image can be reconstructed and decrypted using the specified algorithm. The simulations demonstrate that the method is effective and suitable for image security transmission.

Źródło:

Optica Applicata; 2017, 47, 2; 245-256
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Decoupling control for permanent magnet in-wheel motor using internal model control based on back-propagation neural network inverse system

Autorzy:

Li, Y.
Zhang, B.
Xu, X.

Powiązania:

https://bibliotekanauki.pl/articles/200933.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

electric vehicle
permanent magnet in-wheel motor
back-propagation neural network
inverse system
internal model control
pojazd elektryczny
silnik z napędem na magnesy stałe
inwersja systemu
propagacja wsteczna
model odwrotny
system odwrotny

Opis:

The permanent magnet in-wheel motor (PMIWM) is a nonlinear, multivariable, strongly coupled and highly complex system. The key to the development and application of the PMIWM consists in the improvement of its control accuracy and dynamic performance. In order to effectively decouple the PMIWM, this paper presents a novel internal model control (IMC) approach based on the back-propagation neural network inverse (BPNNI) control method. First, theoretical analysis is conducted to show the existence of the PMIWM inverse system, to be modeled mathematically. The inverse system approximated and identified by the back-propagation neural network (BPNN) constitutes the back-propagation neural network inverse (BPNNI) system. Then, by cascading the BPNNI system on the left side of the original PMIWM system, a new decoupling, pseudo-linear system is established. Moreover, the 2-DOF internal model control (IMC) method is employed to design the extra closed-loop controller that further improves disturbance rejection and robustness of the whole system. Consequently, the proposed decoupling control approach incorporates the advantages of both the BPNNI and the IMC. Effectiveness of thus proposed control approach is verified by means of simulation and real-time hardware-in-the-loop (HIL) experiments.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 6; 961-972
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Polarization-independent metal-dielectric grating with improved bandwidth

Autorzy:

Wang, B
Li, H
Shu, W
Li, W
Li, C
Lei, L
Zhou, J

Powiązania:

https://bibliotekanauki.pl/articles/174684.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

rigorous coupled-wave analysis
reflective efficiency
improved bandwidth

Opis:

A polarization-independent reflective grating with improved bandwidth is presented based on the mixed metal-dielectric grating. The novel grating is composed of the substrate, the metal slab, two dielectric layers, and the covering layer. The grating parameters are optimized for the special duty cycle of 0.6 at an incident wavelength of 1550 nm used in dense wavelength division multiplexing (DWDM). With the designed grating, high efficiency can be diffracted into the reflective –1st order for both TE and TM polarizations, where the polarization-independence is exhibited. Most importantly, the efficiency of more than 90% can be achieved within the incident wavelength bandwidth of 1262–1686 nm, where the bandwidth is improved greatly compared with the reported surface-relief single-layer grating. The reflective grating can have advantages of high efficiency, polarization-independence, and wide bandwidth, which should be useful for DWDM applications.

Źródło:

Optica Applicata; 2015, 45, 1; 71-77
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

New basal synapsid supports Laurasian origin for therapsids

Autorzy:

Liu, J
Rubidge, B.
Li, J.

Powiązania:

https://bibliotekanauki.pl/articles/21774.pdf

Data publikacji:

2009

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

synapsid
Laurasia
therapsid
fossil
paleontology
China
Therapsida
Dashankou
Permian
fauna
Gansu province
tetrapod fossil

Opis:

The distant evolutionary ancestry of mammals is documented by a rich therapsid fossil record. While sphenacodontid synapsids are considered the sister−group of therapsids, the place of origin of therapsids is an enigma, largely because of a long standing morphological and temporal gap (Olson’s Gap) in their fossil record. We describe a new large predatory synapsid, Raranimus dashankouensis gen. et sp. nov., from the Middle Permian of Dashankou in China which has a unique combination of therapsid and sphenacodontid features. This specimen is of great significance asit is a basal therapsid which is the sister taxon to all other therapsids. The fact that it was found in association with Early Permian tetrapods (Anakamacops and Belebey) suggests that it is the oldest therapsid and provides the first evidence of therapsid−bearing rocks which cover Olson’s Gap. It further supports that therapsids may have had a Laurasian rather than Gondwanan origin.

Źródło:

Acta Palaeontologica Polonica; 2009, 54, 3; 393-400
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Applying Image Analysis for Automatic Density Measurement of High-tightness Woven Fabrics
Zastosowanie analizy obrazu do automatycznej oceny gęstości tkanin o dużej zwartości

Autorzy:

Pan, R.
Zhang, J.
Li, Z.
Gao, W.
Xu, B.
Li, W.

Powiązania:

https://bibliotekanauki.pl/articles/232730.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

high-tightness woven fabric
image analysis
Fourier transform
threshold processing
image reconstruct
wysoka szczelność tkaniny
analiza obrazu
transformat Fouriera
rekonstrukcja obrazu

Opis:

To realise the density measurement of high-tightness woven fabrics, an efficient inspection method based on the structure relation is developed in this paper. The structure relations of typical HTWF, twill and satin weave are analyzed and a calculation equation of warp density is given with the fabric weave, weft density and wale density. In the experiment, the weft and wale densities are measured with the Fourier transform, image reconstruction and threshold processing based on separately captured images. The warp density is finally calculated based on the mean value of wale and weft density and the given calculation equation constructed with the weave pattern. The experimental results prove that the automatic measurement density system can realize the precise measurement of high-tightness woven fabric density with satisfactory precision and can replace the current manual analysis method.
Dla zrealizowania pomiarów gęstości tkanin o dużej zwartości opracowano metodę oceny opartą o zależności strukturalne. Zależności strukturalne typowych tkanin HTWF, o splocie skośnymi i satynowym analizowano i opracowano wzory dla obliczania gęstości osnowy, w zależności od gęstości wątku i gęstości prążków wypukłych. Przy przeprowadzeniu eksperymentu gęstości wątku i prążków wypukłych mierzono stosując transformatę Fouriera, rekonstrukcję obrazu i obliczenie wartości progowych wykorzystując indywidualnie otrzymane obrazy. Gęstość osnowy w efekcie jest obliczana w oparciu o średnią wartość gęstości prążków i wątku. Wyniki eksperymentalne potwierdziły, że automatyczny pomiar gęstości jest systemem, który może realizować precyzyjnie pomiar gęstości tkanin o dużej zwartości z zadowalającą dokładnością i w ten sposób może zastąpić dotychczas stosowane metody manualne.

Źródło:

Fibres & Textiles in Eastern Europe; 2016, 2 (116); 66-72
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Sensitive detection of acetylene by second derivative spectra with tunable diode laser absorption spectroscopy

Autorzy:

Deng, H.
Sun, J.
Li, P.
Liu, Y.
Yu, B.
Li, J.

Powiązania:

https://bibliotekanauki.pl/articles/174963.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

tunable diode laser absorption spectroscopy
TDLAS
signal processing
Savitzky–Golay filter
trace gas detection

Opis:

A tunable diode laser absorption spectrometer was developed for trace acetylene gas analysis, the system performance was evaluated by combing an appropriate digital signal processing methods, i.e., Savitzky–Golay smoothing and differentiation algorithm. The calculation of the derivative spectra by this method is accompanied by simultaneous data smoothing. Based on the 2nd deriv- ative spectra detection method, the Allan variance technique indicates a C₂H₂ detection limit of 1.7ppm for 1-s averaging time, and a minimum noise level of 62ppb (parts per billion), at the optimum integration time of ~60s. The calculated 2nd derivative spectra with better resolution, lower detection limits, save signal processing time, and improve the ability to distinguish unresolved spectral signals.

Źródło:

Optica Applicata; 2016, 46, 3; 353-363
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Partitioning of solar radiation in Arctic sea ice during melt season

Autorzy:

Lu, P.
Cheng, B.
Lepparanta, M.
Li, Z.

Powiązania:

https://bibliotekanauki.pl/articles/48057.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

solar radiation
partitioning
Arctic Sea
sea ice
melt season
solar energy
energy absorption
mass balance
spectral irradiance
numerical modelling

Źródło:

Oceanologia; 2018, 60, 4
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Preparation and Up-conversion Luminescence of Yb3+/Er3+/GZO Ceramics

Autorzy:

Li, G.
Wang, B.
Wang, R.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/779137.pdf

Data publikacji:

2018

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Up-conversion
Yb3+/Er3+/GZO
Ceramics
High purity
Luminescence

Opis:

Yb3+/Er3+/GZO ceramics have been synthesized with high temperature solid-state method. The phase and structure of the Yb3+/Er3+/GZO ceramics were characterized by X-ray diffraction (XRD). The XRD pattern that following ions Yb3+, Er3+ and Ga3+ were well doped into the ZnO lattice. Effi cient visible up-conversion (UC) red and green emission were observed under 980 nm excitation. The mechanism of the UC luminescence is investigated on the basis of the UC luminescence emission spectra, the power curve and energy level diagram. The infl uence of doping ions to the intensity ratio of red to green is analyzed and high purity of red light (red/green = 29.9) is fi nally obtained.

Źródło:

Polish Journal of Chemical Technology; 2018, 20, 3; 15-19
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Thermal conductivity of a Brown Earth soil as affected by biochars derived at different temperatures: Experiment and prediction with the Campbell model

Autorzy:

Zhao, B.
Li, L.
Zhao, Y.
Zhang, X.

Powiązania:

https://bibliotekanauki.pl/articles/2082959.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

biochar
bulk density
thermal conductivity
Brown Earth soil
Campbell model

Opis:

Thermal conductivity is a significant heat transfer property of soil. However, the influence of biochar on this property is not well known. In this research, the influence of corn straw biochars prepared at 300, 500 and 700oC on the thermal conductivity of a Brown Earth (Hapli-Udic Cambisol, FAO) soil and its prediction using a Campbell model was examined. The outcomes revealed that the bulk densities of the soil markedly decreased with increases in the biochar amendment rates of 1, 3, and 5% in linear patterns. The reduction in bulk density was mainly attributed to an increase in soil porosity and organic carbon content. With increasing volumetric water contents (10, 20, 30 and 40%), the thermal conductivity of the soils significantly increased, whereas those of soils with biochar amendment were obviously less than that of the CK and the differences increased with the biochar application rates. The pyrolysis temperature of biochar exhibited a negligible effect on the bulk density and thermal conductivity of soils at large. Combining the linear reduction of bulk density with the biochar amendment rate into the Campbell model, well-fitting results for the variation inthermal conductivity versus volumetric water content were obtained and accurate values could be predicted.

Źródło:

International Agrophysics; 2020, 34, 4; 433-439
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Three-port beam splitter based on a sandwiched grating with an improved aspect ratio

Autorzy:

Shu, W
Wang, B
Li, H
Li, W
Chen, L.
Lei, L.
Zhou, J.

Powiązania:

https://bibliotekanauki.pl/articles/174445.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

aspect ratio
sandwiched grating
three-port beam splitter

Opis:

In this paper, a fused-silica transmission grating used as a three-port beam splitter is designed by using the rigorous coupled-wave analysis, which is based on the sandwiched grating structure at the wavelength of 800 nm under normal incidence. Firstly, it is feasible to realize such a grating with the prescribed grating duty cycle and grating period. Next, high efficiency can be also achieved for both TE and TM polarizations. Moreover, the aspect ratio of the grating depth to the ridge width can be improved, which is significant for practical applications. At last, the three-port beam splitter is designed with a covering layer on the surface, which can extend its life service.

Źródło:

Optica Applicata; 2015, 45, 3; 279-284
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Improved Roberts focusing evaluation method for an autofocusing system

Autorzy:

Yin, A.
Dai, Z.
Chen, B.
Li, K.

Powiązania:

https://bibliotekanauki.pl/articles/173381.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

focus evaluation function
evaluation window
autofocusing

Opis:

In this paper, a new focusing evaluation method based on local 2/8 center windows is proposed for an autofocusing system. We have proposed an evaluation function which improved the Roberts function with eight-neighborhood or four-neighborhood. The approximate optimal criteria window is selected by a 2/8 rule. Comparative experiments implemented with other methods have shown that the 2/8 rule method not only can find the approximate optimal evaluation window quickly, but also has better generality. This evaluation function of improved Roberts’ function has higher sensitivity and better real-time performance.

Źródło:

Optica Applicata; 2013, 43, 3; 529-538
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Perspectives on novel vaccine development

Autorzy:

Wang, Y.B.
Wang, L.P.
Li, P.

Powiązania:

https://bibliotekanauki.pl/articles/2087687.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

vaccination
vaccinology
novel vaccine development
perspectives

Źródło:

Polish Journal of Veterinary Sciences; 2018, 21, 3; 643-649
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Compatibility Study of 2,6-Diamino-3,5-dinitropyridine-1-oxide with Some Energetic Materials

Autorzy:

Li, X.
Wang, B.-L,
Lin, Q.-H.

Powiązania:

https://bibliotekanauki.pl/articles/358871.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

compatibility
energetic materials
ANPyO

Opis:

For the application of 2,6-diamino-3,5-dinitropyridine-1-oxide (ANPyO) in composite explosives, the compatibility of ANPyO with some energetic materials was studied by the use of differential scanning calorimetry (DSC), where the energetic materials were cyclotrimethylenetrinitramine (RDX), cyclotetramethylenetetranitramine (HMX), 3,4-dinitrofurazanfuroxan (DNTF), hexanitrohexazaisowurtzitane (CL-20), 2,4,6-trinitrotoluene (TNT), 2,4,6-triamino-1,3,5-trinitrobenzene (TATB), 3-nitro-1,2,4-triazol-5-one (NTO), 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105), 5-amino-1H-tetrazole nitrate (5-ATEZN), ammonium perchlorate (AP), potassium perchlorate (KP), aluminum powder (Al), boron powder (B), magnesium hydride (MgH2) and magnesium borohydride (Mg(BH4)2). The results showed that the binary systems of ANPyO/CL-20, ANPyO/NTO, ANPyO/5-ATEZN, ANPyO/Al, ANPyO/B, ANPyO/MgH2 and ANPyO/Mg(BH4)2 are compatible, and that the systems of ANPyO with RDX, LLM-105, HMX, AP and KP are sensitive, and with DNTF, TNT and TATB are incompatible.

Źródło:

Central European Journal of Energetic Materials; 2016, 13, 4; 978-988
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Galvanic contacting effect of pyrite on xanthate adsorption on galena surface: DFT simulation and cyclic voltammetric measurements

Autorzy:

Ke, B.
Chen, J.
Li, Y.
Chen, Y.

Powiązania:

https://bibliotekanauki.pl/articles/110904.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

adsorption
DFT
galvanic interaction
pyrite surface
galena surface
cyclic voltammetric measurements

Opis:

The effect of galvanic interaction between pyrite and galena on xanthate adsorbing on the galena surface has been investigated by means of density functional theory (DFT) and cyclic voltammetric measurements. The calculated results show that differences in the contact site and contact distance between galena and pyrite can affect the intensity of the galvanic interaction, and the relationship between the intensity of galvanic interaction and the adsorption ability of xanthate on galena surface has been studied in detail. In general, the galvanic interaction between pyrite and galena surface can enhance the adsorption of xanthate on the galena surface. The adsorption energies of xanthate on the galena surface decrease with the decrease of contact distance, and when the contact distance is lower than 4 Å, the adsorption energies decrease significantly at Pb-Pb, Pb-S and S-S sites. In particular, at the contact distance of 3 Å, a sharp decrease of adsorption energy is observed at the Pb-Pb contact site; in this case, the negative shift of the Pb-S bonding range and DOS non-locality at Pb-Pb contact site are significantly greater than that of the S-S or Pb-S contact sites. The cyclic voltammetric measurements reveal that the galvanic interaction between galena and pyrite improves the adsorption of xanthate on galena surface, which is in good agreement with the DFT results.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 3; 826-836
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Analysis of the influence on expressway safety of ramps

Autorzy:

Hu, J. J.
Li, F.
Han, B.
Yao, J.

Powiązania:

https://bibliotekanauki.pl/articles/224137.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

expressway safety
safety
on and off ramp
delay
accidents occurrence probability
droga ekspresowa
bezpieczeństwo na drodze ekspresowej
rampa włączania i wyłączania
opóźnienie
prawdopodobieństwo wystąpienia awarii

Opis:

As the very important parts of the expressway system, on and off ramps have a great effect on the operation effect of expressways. Once congestion occurs at on and off ramps, it will directly affect the safety of the expressway and vehicles. So this paper first analyzes the location design of on ramps, the length and the influences on the expressway running state of off ramp downstream traffic state, and establishes the expressway operation models based at on and off ramps. The expressway operation models include off ramp delay model, on ramp delay model, expressway delay model and side road delay model under the influence of the distance between on and off ramp and traffic volume. At the same time, the paper analyzes the connection between the traffic operation state and traffic safety, and establishes the expressway safety model based on congestion degree. Through simulation verification, the impact of on and off ramp on the security of the expressway is analyzed. In the simulation, safety rank division is simulated to verify and safety index of different safety ranks. Finally the paper concludes that the delay caused by traffic of the on and off ramps can decrease the safety of expressway.

Źródło:

Archives of Transport; 2017, 43, 3; 43-51
0866-9546
2300-8830

Pojawia się w:

Archives of Transport

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Indicated mean effective pressure oscillations in a natural gas combustion engine by recurrence plots
Analiza wykresów rekurencyjnych dla średniego efektywnego ciśnienia indykowanego w silniku spalinowym zasilanym gazem naturalnym

Autorzy:

Litak, G.
Syta, A.
Yao, B. -F.
Li, G.-X

Powiązania:

https://bibliotekanauki.pl/articles/280206.pdf

Data publikacji:

2009

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

engine
combustion
recurrence plot
nonlinear oscillations

Opis:

We investigate the nonlinear time series of Indicated Mean Effective Pressure (IMEP) of the spark ignition engine cyclic combustion process of a natural gas. By applying the embedding theorem and the recurrence plots technique, we show changes in the engine dynamics for different equivalence ratios. Especially, we provide arguments for intermittency behaviour.
Zbadano nieliniowe przebiegi czasowe Średniego Ciśnienia Indykowanego cyklicznego procesu spalania w silniku spalinowym zasilanym gazem naturalnym. Stosując twierdzenie o zanurzeniu oraz technikę wykresów rekurencyjnych, pokazano istotne różnice w dynamice silnika przy zmianie składu mieszanki paliwa wyrażonej wartością współczynnika równowagowego. W szczególności podano argumenty przemawiające za występowaniem zjawiska intermitencji.

Źródło:

Journal of Theoretical and Applied Mechanics; 2009, 47, 1; 55-67
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

A novel method to extract vanadium from high-grade vanadium slag: non-salt roasting and alkaline leaching

Autorzy:

Liu, B.
Meng, L.
Zheng, S.
Li, M.
Wang, S.

Powiązania:

https://bibliotekanauki.pl/articles/110480.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

high-grade vanadium slag
cleaner production
non-salt roasting
alkaline leaching
mechanisms

Opis:

A new method using non-salt roasting-alkaline leaching to treat vanadium slag was proposed in this study. The V(III) in vanadium slag is oxidized to V(V) by roasting and the latter can be effectively leached out as vanadate by alkaline leaching. This method possesses distinct advantage of being able to treat high-grade vanadium slag. For the South Africa high-grade vanadium slag, the maximum vanadium recovery of 98% was achieved when the reaction conditions were roasting temperature of 850 °C, roasting time of 2 h, alkali concentration of 30 wt.%, leaching temperature of 210 °C, and leaching time of 2 h. The roasting and leaching mechanisms have been well elucidated based on the XRD and SEM analysis results. The phases transitions of vanadium slag were clearly presented. This work has laid the foundation for the industrial application of non-salt roasting-alkaline leaching and provided new insights into effective extraction of high-grade vanadium slag.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 3; 657-667
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Design and analysis of interior composite-rotor bearingless permanent magnet synchronous motors with two layer permanent magnets

Autorzy:

Sun, X.
Su, B.
Chen, L.
Yang, Z.
Li, K.

Powiązania:

https://bibliotekanauki.pl/articles/200490.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

bearingless motor
permanent magnet motor
finite element analysis
cogging torque
static electromagnetic characteristics
silnik z magnesem trwałym
analiza elementów skończonych
moment skręcający
właściwości elektromagnetyczne
silnik bezłożyskowy

Opis:

In this paper, a new type of interior composite-rotor bearingless permanent magnet synchronous motors (BPMSMs) with two layer permanent magnets (PMs) is proposed. In order to reduce the torque ripple of this kind of motors, the sizes of PMs are optimized. Moreover, the magnetic field analysis of the interior composite-rotor BPMSM with two layer PMs is carried out by the finite element method (FEM). The corresponding static electronic magnetic characteristics at no load, including magnetic field, PM flux linkage and inductance, are studied in detail. In addition, electromagnetic torque characteristics and suspension force characteristics are also investigated thoroughly. The results of the analysis and simulation lay a significant foundation for further research on the interior composite-rotor BPMSMs with two layer PMs.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 6; 833-843
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Numerical study of wave transmission over double submerged breakwaters using non-hydrostatic wave model

Autorzy:

Liang, B.
Wu, G.
Liu, F.
Fan, H.
Li, H.

Powiązania:

https://bibliotekanauki.pl/articles/48006.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

submerged breakwater
wave transmission
numerical result
physical model

Źródło:

Oceanologia; 2015, 57, 4
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Rare Earth Elements supply vs. clean energy technologies: new problems to be solve
Dostawy pierwiastków ziem rzadkich (REE) a czyste technologie energetyczne: nowe problemy do rozwiązania

Autorzy:

Zhou, B.
Li, Z.
Zhao, Y.
Zhang, C.
Wei, Y.

Powiązania:

https://bibliotekanauki.pl/articles/216173.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN

Tematy:

rare earth element
clean energy technology
supply chain
pierwiastki ziem rzadkich
czysta technologia energetyczna
łańcuch dostaw

Opis:

Rare earth elements (REEs) provide important properties to clean energy technologies such as wind turbine and hybrid electric vehicles. The global REE demand will grow rapidly during the global transformation toward a greener economy in the next decades. This high demand will require a steady supply chain in the long run. China has a monopoly of global REE production and extraction. The global REE supply chain runs the risk of disruption along with Chinese REE policy evolution. To overcome this supply chain vulnerability, new strategies and measures should be adopted to satisfy future REE supply/demand. There is a pressing need to explore REE deposits, develop efficient REE recycling techniques from end-of-life products, improve substitution technologies for REEs, and reduce the number of critical REEs used in devices. Such measures are facing significant challenges due to environmental factors and an unbalanced market, and overcoming them requires efforts from government and REE companies.
Pierwiastki ziem rzadkich (Rare Earths Elements) mają istotne znaczenie dla rozwoju czystych technologii energetycznych, takich jak turbiny wiatrowe czy pojazdy hybrydowe. Światowy popyt na REE będzie wzrastał w związku z globalną transformacją w kierunku bardziej czystej (ekologicznej) gospodarki w okresie najbliższych dziesięcioleci. Wysoki popyt wymagać będzie stabilnego łańcucha dostaw REE w dłuższej perspektywie. Chiny mają monopol w zakresie globalnej produkcji i wydobycia REE. Światowe dostawy REE obarczone są jednak ryzykiem zakłóceń wynikających z chińskiej polityki w tym zakresie. W związku z tym, powinny być przyjęte nowe środki i strategie w celu zaspokojenia przyszłego popytu/podaży na REE. Istnieje pilna konieczność: poszukiwania nowych złóż, opracowania skutecznych technik recyklingu z wycofanych z eksploatacji produktów, poprawy technologii z zastosowaniem substytutów REE oraz zmniejszenie liczby krytycznych pierwiastków ziem rzadkich w stosowanych urządzeniach. Działania te stanowią poważne wyzwanie ze względu na czynniki środowiskowe i niezrównoważony rynek (monopol podaży). Przezwyciężenie ich wymaga odpowiednich działań ze strony rządu i firm zajmujących się produkcją REE.

Źródło:

Gospodarka Surowcami Mineralnymi; 2016, 32, 4; 29-44
0860-0953

Pojawia się w:

Gospodarka Surowcami Mineralnymi

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

The influence of landing mat composition on ankle injury risk during a gymnastic landing: a biomechanical quantification

Autorzy:

Xiao, X.
Xiao, W.
Li, X.
Wan, B.
Shan, G.

Powiązania:

https://bibliotekanauki.pl/articles/306922.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

symulacja komputerowa
właściwości mechaniczne
sztywność
tarcie
computer simulation
impact load
mechanical properties of floor mats
stiffness
dampness
friction

Opis:

Purpose: About 70% injury of gymnasts happened during landing – an interaction between gymnast and landing mat. The most injured joint is the ankle. The current study examined the effect of mechanical properties of landing mat on ankle loading with aims to identify means of decreasing the risk of ankle injury. Method: Gymnastic skill – salto backward stretched with 3/2 twist was captured by two high-speed camcorders and digitized by using SIMI-Motion software. A subject-specific, 14-segment rigid-body model and a mechanical landing-mat model were built using BRG.LifeMODTM. The landings were simulated with varied landing-mat mechanical properties (i.e., stiffness, dampness and friction coefficients). Result: Real landing performance could be accurately reproduced by the model. The simulations revealed that the ankle angle was relatively sensitive to stiffness and dampness of the landing mat, the ankle loading rate increased 26% when the stiffness was increased by 30%, and the changing of dampness had notable effect on horizontal ground reaction force and foot velocity. Further, the peak joint-reaction force and joint torque were more sensitive to friction than to stiffness and dampness of landing mat. Finally, ankle muscles would dissipate about twice energy (189%) when the friction was increased by 30%. Conclusion: Loads to ankles during landing would increase as the stiffness and dampness of the landing mat increase. Yet, increasing friction would cause a substantial rise of the ankle internal loads. As such, the friction should be a key factor influencing the risk of injury. Unfortunately, this key factor has rarely attracted attention in practice.

Źródło:

Acta of Bioengineering and Biomechanics; 2017, 19, 1; 105-113
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

An Insensitive Booster Explosive: DAAF Surface-coated with Viton A

Autorzy:

Li, X.
Wu, B.
Liu, S.
An, C.
Wang, J.

Powiązania:

https://bibliotekanauki.pl/articles/358841.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

DAAF
refinement
surface-coated
thermal analysis
impact sensitivity

Opis:

3,3’-Diamino-4,4’-azoxyfurazan (DAAF) is the principal component of an insensitive booster explosive; refined DAAF and DAAF surface-coated with Viton A were prepared. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential scanning calorimetry (DSC) were employed to characterize the morphology, composition, and thermal decomposition of these samples. The impact sensitivity and theoretical detonation velocity of DAAF-based composites were also measured and analyzed. The results showed that DAAF surface-coated with Viton A was successfully obtained, and the impact sensitivity of DAAF/Viton A composites was much lower than that of crude DAAF. In addition, DAAF/Viton A composites exhibited better thermal stability compared to crude DAAF and refined DAAF. The theoretical detonation velocity of DAAF/Viton A composites and TATB/Viton A composites are roughly the same. Therefore, there is still great potential for DAAF to be used as the main explosive component of a booster explosive.

Źródło:

Central European Journal of Energetic Materials; 2018, 15, 3; 445-455
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Optimization and evaluation of alkali-pretreated Paeonia ostii seed coats as adsorbent for the removal of MB from aqueous solution

Autorzy:

Liu, Q.
Li, T.
Zhang, S.
Qu, L.
Ren, B.

Powiązania:

https://bibliotekanauki.pl/articles/779066.pdf

Data publikacji:

2018

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Alkali-pretreated Paeonia ostii seed coats
Adsorption
Methylene blue
Mechanism

Opis:

A novel efficient adsorbent, alkali-pretreated Paeonia ostii seed coats (AP-PSC), was investigated for the removal of methylene blue (MB) dye from solution. Orthogonal array design was applied to optimize the process parameters viz. alkali concentration, liquid-solid ratio (LSR) and pretreatment time. The results revealed that the optimal pretreatment conditions were at 0.8% (w/w) NaOH with LSR of 0.35 L g^–1  treating for 50 min. Equilibrium and kinetic studies indicated that Langmuir isotherm and Pseudo-second-order models described the experimental data well. The maximum adsorption capability was of 368.2 mg g^–1  for MB at 25°C. Thermodynamic parameters suggested that the AP-PSC adsorption process was physical, endothermic and spontaneous. Furthermore, the adsorption process was influenced by several interactive mechanisms, including ion-exchange, as well as Van der Waals forces and hydrogen bonds that occur concomitantly. It was concluded that AP-PSC may be potential as an efficient adsorbent to remove MB from solution.

Źródło:

Polish Journal of Chemical Technology; 2018, 20, 3; 29-36
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 46.

Tytuł:

Modular design and assembly of automotive and architectural structures - product integration through adhesive bonding
Projektowanie i montaż systemów modułowych w przemyśle samochodowym i budownictwie - połączenie elementów wyrobów metodą klejenia

Autorzy:

Kuys, B.
Gutowski, M.
Li, S.
Gutowski, V. S.
Cerra, A.

Powiązania:

https://bibliotekanauki.pl/articles/175851.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

modularisation systems
automotive
building industry
adhesive bonding
systemy modułowe
motoryzacja
budownictwo
połączenia klejone

Opis:

This paper analyses advances in design and manufacturing methodology based on system modularisation in the automotive and building & construction industries and offers novel, fully validated technology for modules assembly by adhesive bonding. It is shown, how application of appropriate modularisation methodology through sub-division of the entire system into principal system platform and independent functional or stylistic modules enables identification of components common to an entire family of product, and those which facilitate product re-configuration and stylings. The latter category of subcomponents are easily integrated into the final structure by mounting onto the principal system platform through interfaces facilitating rapid assembly and/or disassembly of the product. Through adoption of modularisation, the pivotal structure elements such as automotive framing systems or high-rise building’s curtain wall framing and cladding can be quickly and cost effectively designed, re-designed when needed (for instance for re-styling or refurbishing) and cost-effectively reconfigured through assembly of a variety of designated sub-systems onto the principal system platform. Another aspect of this paper discusses and validates a feasible technology facilitating for surface modification of typical engineering substrate materials (plastics, composites, metals and ceramics) for rapid assembly of structures through adhesive bonding of decorative and/or functional cladding and vision panels to curtain wall structures of high-rise commercial or residential buildings. An identical approach to applications in rapid assembly of automotive modular systems will be presented in the forthcoming paper.
W pracy zawarto analizę postępu w metodach projektowania i produkcji opartych na zasadzie systemów modułowych w motoryzacji oraz budownictwie, również technologię montażu za pomocą połączeń klejonych. Przedstawiono, w jaki sposób przyjęcie odpowiednich modułów poprzez podział całego systemu wpływa na podstawową platformę montażową oraz autonomiczne moduły funkcjonalne i stylistyczne. Umożliwiona jest wówczas identyfikacja elementów wspólnych dla całej rodziny produktów, także pozwalających na przekształcenie lub stylizację wyrobu. Moduły autonomiczne są łatwo integrowalne w produkty finalne poprzez montaż na podstawowej platformie montażowej przez zastosowanie połączeń standardowych – umożliwiają szybki montaż i/lub demontaż. Wykorzystanie modułowych, kluczowych elementów konstrukcji, jak rama zawieszenia samochodu lub ściana osłonowa wysokościowca i płyty ościenne pozwala na przekształcanie, szybkie i tanie projektowanie, również przeprojektowywanie (np. dla nowej stylizacji lub odnowienia budynku), oraz przekształcanie poprzez montaż różnych nowo projektowanych podsystemów na głównej platformie montażowej systemu. Odrębny fragment pracy omawia łatwą do wprowadzenia technologię modyfikacji powierzchni typowych materiałów inżynierskich (polimery, kompozyty, metale i ceramika) dla szybkiego montażu konstrukcji poprzez klejenie ozdobnych lub funkcjonalnych paneli ościennych lub szkła do ram ścian osłonowych wysokich budynków mieszkalnych i komercyjnych. Identyczne podejście w zastosowaniu do szybkiego montażu samochodowych systemów modułowych będzie przedstawione w kolejnym artykule.

Źródło:

Advances in Manufacturing Science and Technology; 2016, 40, 3; 5-28
0137-4478

Pojawia się w:

Advances in Manufacturing Science and Technology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:

Optimal vibration control of conical shells with collocated helical sensor/actuator pairs
Optymalne sterowanie drganiami powłok stożkowych za pomocą spiralnego skolokowanego układu czujnika i elementu wykonawczego

Autorzy:

Li, H.
Hu, S. D.
Tzou, H. S.
Chen, Z. B.

Powiązania:

https://bibliotekanauki.pl/articles/280352.pdf

Data publikacji:

2012

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

smart structure
conical shell
diagonal sensor/actuator
optimal vibration control

Opis:

This paper focuses on the optimal vibration control of clamped-free conical shells using distributed helical piezoelectric sensor/actuator (S/A) pairs. Based on the independent modal space control, the response of conical shell to external excitations is represented by the summation of all participating natural modes and their respective modal participation factors, and each mode can be controlled independently. The modal equation is transformed into the linear state space form. The linear quadratic (LQ) controllers are designed for each independent mode. The optimal gain matrix is related to the ratio G∗ between the control voltage and sensing signal by the modal control force per unit voltage B₂ and the sensing signal per unit displacement C₁. Because B₂ and C₁ change with locations of the S/A pair, the optimal control effects, modal control forces and corresponding optimal control voltages are evaluated using two S/A pairs at different locations. The results indicate that the optimal control method is effective in vibration control of the shell. The optimal control effect also depends on the location of the S/A pair and modal shapes as well as the modal control force and input voltage.
W pracy skoncentrowano się na problemie optymalnego sterowania drganiami jednostronnie zamocowanych powłok stożkowych za pomocą spiralnie ułożonego układu piezoelektrycznego czujnika skolokowanego z elementem wykonawczym (S/A). W oparciu o wyniki płynące z rozwiązania przestrzennego zagadnienia sterowania modalnego, dynamiczną odpowiedź powłoki na wymuszenie zewnętrzne wyrażono sumą postaci własnych, jednocześnie stwierdzając, że można niezależnie ingerować w poszczególne postaci własne układu. Równanie modalne przetransformowano do liniowej formuły stanu. Zaprojektowano sterowniki liniowo-kwadratowe (LQ) niezależnie dla każdej postaci własnej. Optymalną macierz współczynników wzmocnienia skorelowano z transmitancją G∗ pomiędzy napięciem sterowania i sygnału czujnika poprzez jednostkową siłę sterującą odniesioną do napięcia B₂ oraz sygnału czujnika w stosunku do przemieszczenia C₁. Ponieważ B₂ i C₁ zmieniają się wraz ze zmianą położenia skolokowanych par S/A, przeprowadzono ewaluację modalnych sił sterujących i odpowiadających im napięć dla różnych położeń układu sterowania. Wyniki badań potwierdziły efektywność optymalnego sterowania drganiami powłoki stożkowej. Zauważono także wrażliwość uzyskanego stopnia sterowania na położenie pary czujnika i elementu wykonawczego oraz wartości modalnej siły sterującej, jak i napięcia.

Źródło:

Journal of Theoretical and Applied Mechanics; 2012, 50, 3; 769-784
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 48.

Tytuł:

Behavior of gallium and germanium associated with zinc sulfide concentrate in oxygen pressure leaching

Autorzy:

Liu, F.
Liu, Z.
Li, Y.
Wilson, B. P.
Lundstrom, M.

Powiązania:

https://bibliotekanauki.pl/articles/110812.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

zinc sulfide concentrate
gallium
germanium
pyrite
oxygen pressure leaching

Opis:

The Fankou zinc concentrate (Guangdong province, China) was mineralogically characterized and results showed that the main germanium-bearing minerals in the sample comprised of zinc sulfide and galena, whereas gallium-bearing minerals were pyrite, sphalerite and silicate. Oxygen pressure leaching of zinc sulfide concentrate was carried out in order to investigate the effect of pressure, leaching time, sulfuric acid and copper concentrations on the leaching behavior of gallium and germanium. Under optimum conditions, leaching of Zn, Fe, Ge and Ga reached 98.21, 90.45, 97.45 and 96.65%, respectively. In the leach residues, it was determined that some new precipitates, such as PbSO4, CaSO4 and SiO2, were formed, which co-precipitated a certain amount of Ga and Ge from the leach solution. The results clearly indicated that Ga and Ge were much more difficult to leach than Zn, and provided answers to why the leaching efficiency of Ga is 10% lower when compared to Ge.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1047-1060
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 49.

Tytuł:

Influence of the photosynthetic pathway on the hydrogen isotopic profile of glucose

Autorzy:

Zhang, B.
Billault, I.
Li, X.
Mabon, F.
Remaud, G.
Martin, M.

Powiązania:

https://bibliotekanauki.pl/articles/146974.pdf

Data publikacji:

2002

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

deuterium
glucose
isotope ratio
plant metabolism
SNIF-NMR

Opis:

The SNIF-NMR method (site-specific natural isotope fractionation studied by Nuclear Magnetic Resonance) was used to examine the isotopic profile of glucoses derived from plants with different photosynthetic pathways. It is shown that the type of photosynthetic metabolism, either C3 (beet-root, orange, grape), C4 (maize, sugar-cane) or CAM (pineapple), exerts a strong influence on the deuterium distribution in the sugar molecules. The isotopic profile also depends, secondarily, on the physiological status of the precursor plant. Consequently, the isotopic fingerprint of glucose may be a rich source of information in mechanistic comparisons of metabolic pathways. Moreover, from an analytical point of view, it may provide complementary criteria with respect to the ethanol probe for origin inference of sugars.

Źródło:

Nukleonika; 2002, 47,suppl.1; 63-65
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

The cavitation nuclei transient characteristics of Lennard-Jones fluid in cavitation inception

Autorzy:

Fu, Q.
Zhang, B.
Zhao, Y.
Zhu, R.
Liu, G.
Li, M.

Powiązania:

https://bibliotekanauki.pl/articles/259255.pdf

Data publikacji:

2018

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

cavitation nuclei
molecular dynamics simulation
Lennard-Jones fluid
cavitation inception
nucleation

Opis:

In the field of ocean engineering, cavitation is widespread, for the study of cavitation nuclei transient characteristics in cavitation inception, we applied theoretical analysis and molecular dynamics (MD) simulation to study Lennard-Jones (L-J) fluid with different initial cavitation nuclei under the NVT-constant ensemble in this manuscript. The results showed that in cavitation inception, due to the decrease of liquid local pressure, the liquid molecules would enter the cavitation nuclei, which contributed to the growth of cavitation nuclei. By using molecular potential energy, it was found that the molecular potential energy was higher in cavitation nuclei part, while the liquid molecular potential energy changes greatly at the beginning of the cavitation nuclei growth. The density of the liquid and the surface layer changes more obvious, but density of vapor in the bubble changes inconspicuously. With the growth of cavitation nuclei, the RDF peak intensity increased, the peak width narrowed and the first valley moved inner. When cavitation nuclei initial size reduced, the peak intensity reduced, the corresponding rbin increased. With the decrease of the initial cavitation nuclei, the system pressure and total energy achieved a balance longer, and correspondingly, they were smaller. In addition, at the beginning of the cavitation nuclei growth, the total energy and system pressure changed greatly.

Źródło:

Polish Maritime Research; 2018, S 2; 75-84
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

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