Autor: Xie, G. - Katalog OPAC zbiorów

Skocz do pozycji: 16.

Tytuł:: Research on E.C. Bingham constitutive model of rock under impact load for deep well
Wykorzystanie modelu E.C. Binghama przy badaniu skał narażonych na obciążenia udarowe w górnictwie podziemnym
Autorzy:: Zhao, G. M.
Xie, L. X.
Meng, X. R.
Powiązania:: https://bibliotekanauki.pl/articles/348692.pdf
Data publikacji:: 2012
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: SHPB
teoria odkształceń ciągłych
statystyczna teoria odkształceń
równanie powstawania odkształceń
model E.C. Bingham'a
continuum damage theory
statistical damage theory
constitutive equation of damage excess stress model
E.C. Bingham constitutive model
Opis:: The soft rock materials have special dynamic properties in deep mining. Their dynamic compression tests are performed with experimental system of Split Hopkinson Pressure Bar (SHPB). The results of experiment indicate that the dynamic stress-strain curves of rock materials are of distinct plastic yield characteristics. Based on modified excess stress model, according to the function relationship between strain, strain rate and, to simplify constitutive equation of modified excess stress model with dimensionless analysis, the simplified constitutive equation of modified excess stress model is obtained; And then, continuum damage theory and statistical damage theory are incorporated into the simplified constitutive equation of modified excess stress model account for the influence of damage to dynamic strength, the simplified constitutive equation of damage excess stress model is built up. The simplified constitutive functions are fitted out respectively on the basis of the experimental data. There is a good coherence between the fitting stress-strain curves and the experimental stress-strain curves.
Miękkie materiały skalne w kopalniach głębokich posiadają specyficzne właściwości dynamiczne. Wykonano testy kompresji dynamicznej przy zastosowaniu urządzenie kompresyjnego Hopkinsona (Split Hopkinson Pressure Bar SHPB). Wyniki przeprowadzonych badań wykazały, krzywe wykresu rozciągania skał mają charakterystykę typową dla materiałów upłynnionych. W oparciu o model rozkładu naprężeń, zgodnie z funkcją zależności pomiędzy typem odkształcenia a jego szybkością, celem uproszczenia równania odkształcenia zmodyfikowanego przy pomocy analizy bezwymiarowej, otrzymano równanie opisujące model naprężeń zmodyfikowanych. Następnie wykorzystano teorię ciągłego kontinuum oraz teorię statystyki odkształceń w równaniu odkształcenia zmodyfikowanego celem ustalenia zależności z badanym modelem. Uproszczone w ten sposób funkcje skorelowano na podstawie otrzymanych danych doświadczalnych. Ustalono wysoką spójność pomiędzy krzywymi teoretycznymi i doświadczalnymi.
Źródło:: AGH Journal of Mining and Geoengineering; 2012, 36, 3; 489-500
1732-6702
Pojawia się w:: AGH Journal of Mining and Geoengineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 17.

Tytuł:: Theoretical analytical solution of deformation and stress distribution of underground gas storage cavern in bedded salt rock
Autorzy:: Xie, P.
Wen, H. J.
Wang, G. J.
Hu, J.
Powiązania:: https://bibliotekanauki.pl/articles/230968.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: złoża soli kamiennej
analiza teoretyczna
funkcja wypierania Love'a
zasada zgodności sprężysto-lepkosprężystej
różnica skończona trójwymiarowa wyraźna
bedded salt rock
theoretical analysis
Love displacement function
elastic-viscoelastic correspondence principle
three-dimensional explicit finite-difference
Opis:: The main purpose of the study is to investigate the mechanical properties around an underground gas storage cavern in bedded salt rock. Firstly, considering the characteristics of the salt rock formation in China, the mechanical model was simplified into a hollow cylinder, which containing non-salt interlayer. In terms of elastic theory, Love displacement function was developed, and the elastic general solution of stress and deformation components were obtained after determining the undetermined coefficients. Under the same condition, numerical simulation was carried out. The validity of the elastic general solution is verified by comparing to numerical simulation results. Furthermore, Based on the feasible general elastic solution, viscoelastic solution was obtained through Laplace transformation and inverse Laplace transform, which could provide reference for the study on the stability and tightness of underground gas storage carven during operation to some extent.
Źródło:: Archives of Civil Engineering; 2018, 64, 4/I; 37-53
1230-2945
Pojawia się w:: Archives of Civil Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 18.

Tytuł:: Efficient learning variable impedance control for industrial robots
Autorzy:: Li, C.
Zhang, Z.
Xia, G.
Xie, X.
Zhu, Q.
Powiązania:: https://bibliotekanauki.pl/articles/200716.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: variable impedance control
reinforcement learning
efficient
Gaussian process
industrial robots
impedancja
poprawa efektywności
wydajność
model Gaussa
roboty przemysłowe
Opis:: Compared with the robots, humans can learn to perform various contact tasks in unstructured environments by modulating arm impedance characteristics. In this article, we consider endowing this compliant ability to the industrial robots to effectively learn to perform repetitive force-sensitive tasks. Current learning impedance control methods usually suffer from inefficiency. This paper establishes an efficient variable impedance control method. To improve the learning efficiency, we employ the probabilistic Gaussian process model as the transition dynamics of the system for internal simulation, permitting long-term inference and planning in a Bayesian manner. Then, the optimal impedance regulation strategy is searched using a model-based reinforcement learning algorithm. The effectiveness and efficiency of the proposed method are verified through force control tasks using a 6-DoFs Reinovo industrial manipulator.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 201-212
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 19.

Tytuł:: Theoretical investigation of vanadium oxide film with surface microstructure
Autorzy:: Hong, W.
Wang, Z.
Chen, Q.
Sheng, C.
Gu, G.
Luo, P.
Xie, Y.
Powiązania:: https://bibliotekanauki.pl/articles/174416.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: vanadium oxide
VO2
film
surface microstructure
photonic band edge
dispersion material
Opis:: This paper presents a method to design a surface microstructure of vanadium oxide to enhance optical absorption. This method, using a density of eigenfrequency, can be calculated by a planar wave expand method, to indicate the absorption efficiency of a dispersion material, which can be used as an approach method for further design. Based on this, a nanostructure-based vanadium oxide film is designed and simulated to validate this method. The simulation results show that the tendency of density of eigenfrequency is corresponding to the tendency of optical absorption enhancement. Moreover, this structure can achieve high optical broadband absorption when the material dispersion is considered. High optical absorption enhancement can be achieved by adjusting the geometrical parameters; our maximum overall enhancement absorption ratio was 31.84% at the metal phase, which can be attributed to the enhancement effect of a photonic band edge.
Źródło:: Optica Applicata; 2017, 47, 4; 601-609
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 20.

Tytuł:: Transcriptomic landscape of Dendrobium huoshanense and its genes related to polysaccharide biosynthesis
Autorzy:: Han, R.
Xie, D.
Tong, X.
Zhang, W.
Liu, G.
Peng, D.
Yu, N.
Powiązania:: https://bibliotekanauki.pl/articles/57911.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Botaniczne
Opis:: Dendrobium huoshanense has long been used to treat various diseases in oriental medicine. In order to study its gene expression profile, transcripts involved in the biosynthesis of precursors of polysaccharides, as well as mechanisms underlining morphological differences between wild and cultivated plants, three organs of both wild type and cultivated D. huoshanense were collected and sequenced by Illumina HiSeq4000 platform, yielding 919,409,540 raw reads in FASTQ format. After Trinity de novo assembly and quality control, 241,242 nonredundant contigs with the average length of 967.5 bp were generated. qRT-PCR experiment on the selected transcripts showed the transcriptomic data were reliable. BLASTx was conducted against NR, SwissProt, String, Pfam, and KEGG. Gene ontology annotation revealed more than 40,000 contigs assigned to catalytic activity and metabolic process, suggesting its dynamic physiological activities. By searching KEGG pathway, six genes potentially involved in mannose biosynthetic pathway were retrieved. Gene expression analysis for stems between wild and cultivated D. huoshanense resulted in 956 genes differentially expressed. Simple sequence repeats (SSRs) analysis revealed 143 SSRs with the unit size of 4 and 3,437 SSRs the size of 3. The obtained SSRs are the potential molecular markers for discriminating distinct cultivars of D. huoshanense.
Źródło:: Acta Societatis Botanicorum Poloniae; 2018, 87, 1
0001-6977
2083-9480
Pojawia się w:: Acta Societatis Botanicorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 21.

Tytuł:: Thermally induced damage in hexanitrohexaazaisowurtzitane
Autorzy:: Tian, Q.
Yan, G.
Sun, G.
Huang, C.
Xie, L.
Chen, B.
Huang, M.
Li, H.
Liu, X.
Wang, J.
Powiązania:: https://bibliotekanauki.pl/articles/358735.pdf
Data publikacji:: 2013
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: CL-20
SAXS
AFM
thermal effects
voids
Opis:: The evolution of the microstructure of hexanitrohexaazaisowurtzitane (CL-20) after a thermal stimulus plays a key role in the performance of CL-20. In the current work, microstructural variations of CL-20 caused by thermal treatment were investigated by X-ray diffraction, in situ variable-temperature optical microscopy, atom force microscopy, and small-angle X-ray scattering. A wave-like process, an abrupt volume expansion, movement, and fragmentation of CL-20 particles during phase transition were observed. After the phase transition (160 °C) the CL-20 sample acquired a very rough surface with numerous dimple depressions, and during the thermal decomposition stage (200 °C) a large number of voids were produced in both the bulk and the surface of the CL-20.
Źródło:: Central European Journal of Energetic Materials; 2013, 10, 3; 359-369
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki