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1
The accuracy of the thermal dissipation technique for estimating sap flow is affected by the radial distribution of conduit diameter and density
100%
Xie J. , Wag X.
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nr 05
2
The influence of finite element meshing accuracy on a welding machine for offshore platform's modal analysis
80%
Xie J. , Sun D. , Xu C. , Wu J.
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nr Special Issue S3
EN
The purpose objective of this study was to investigate the inf luence of finite element meshing accuracy on modal analysis which is one of the basic factors affecting the accuracy of finite element analysis and mostly preoccupies the working staff in pre-processing finite element simulation models. In this paper, we established several finite element models of a welding machine for offshore platform, with the meshing accuracy as the variable and workbench software as the platform for modal analysis, as the same time, comparing the analysis results. The results indicated that for some specific structures and simulation types, mesh refinement alone does not achieve desired results, and the authors indicate that mesh refinement is rarely related to the equipment’s low-frequency modal analysis but it’s great related to the equipment’s high-frequency modal analysis. The findings of this study may serve as breaking the opinion that smaller mesh size means higher calculation precision and provides references for mesh division practices in low frequency modal analysis
3
Content available remote Identification and simultaneous determination of glycyrrhizin, formononetin, glycyrrhetinic acid, liquiritin, isoliquiritigenin, and licochalcone A in licorice by LC-MS/MS
80%
Xie J. , Zhang Y. , Wang W. , Hou J.
Acta Chromatographica
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2014
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tom Vol. 26, no. 3
507--516
EN
A new liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and validated for simultaneous determination of glycyrrhizin, formononetin, glycyrrhetinic acid, liquiritin, isoliquiritigenin, and licochalcone A in licorice. An Eclipse Plus C18 column (I.D. 4.6 × 100 mm, 3.5 μm particle size; Agilent) was used in the analysis. Electrospray ionization (ESI)-tandem interface in the negative mode was performed, and multiple reaction monitoring (MRM) was employed with the precursor multiple reaction monitoring production combination for the determination of six analytes. The average recoveries ranged from 98.30% to 100.13% with relative standard deviations (RSDs) ≤ 1.95%, and limits of detection (LODs) ranged from 2.1 to 3.6 pg. The applicability of this analytical approach was confirmed by the successful analysis of six samples. The results indicated that the established method was validated, sensitive, and reliable for the determination of six analytes in licorice.
4
Content available A fully coupled solid and fluid model for simulating coal and gas outburst with DEM and LBM
80%
Wang Y. C. , Xue S. , Xie J.
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2012
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tom Vol. 36, no. 3
377-384
EN
In this paper, we present a fully coupled solid-fluid code which is developed to model the whole process of coal and gas outbursts. The Discrete Element Method is used to model the deformation and fracture of solid, while Lattice Boltzmann Method models fluid flow, including free flow and Darcy flow. These two methods are coupled in a two-way process: the solid part provides a moving boundary condition and transfers momentum to the fluid, and the fluid exerts a dragging force to the solid. Gas desorption occurs at solid-fluid boundary, and gas diffusion is implemented in the solid code where particles are assumed as porous material. Some preliminary simulations are carried out to validate the code.
PL
W niniejszej publikacji prezentujemy w pełni zintegrowany kod oddziaływania pomiędzy cieczą a ciałem stałym, opracowany do modelowania całego procesu wyrzutów węgla i gazu. Metoda elementów dyskretnych stosowana jest do modelowania deformacji i pęknięcia ciała stałego, podczas gdy metoda siatkowa Boltzmanna - do modelowania przepływu cieczy, w tym przepływu swobodnego i przepływu zgodnie z prawem Darcy'ego. Te dwie metody połączone są w procesie dwukierunkowym: część stała zapewnia warunki ruchomej granicy rozdziału, przenosząc pęd do cieczy, a ciecz wywiera opór na ciele stałym. Desorpcja gazu występuje na granicy oddziaływania pomiędzy cieczą a ciałem stałym, a do rozproszenia gazu dochodzi w kodzie ciała stałego, gdzie cząsteczki traktowane są jako materiał porowaty. Prowadzone są wstępne symulacje w celu sprawdzenia poprawności kodu.
5
Content available An enclosed dust removal system with ducting
80%
Xie J. , Xue S. , Chen W. M. , Zhou G.
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2012
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tom Vol. 36, no. 3
423-433
EN
A numerical modeling study is undertaken to understand gas-solid particle flows at the face of a mechanically developing roadway of an underground coal mine which employs a force-exhaust auxiliary ventilation system and uses mist spray for dust suppression. The FLUENT, a commercial computational fluid dynamics (CFD) package is used with Semi Implicit Method for Pressure Linked Equations (SIMPLE) algorithm for simulation. The results of the modeling show that dust control should focus on the middle area of the face. Based on the results, an enclosed dust removal system with ducting was developed. The system was successfully trialed at an underground coal mine with a satisfactory result.
PL
Aby uzyskać przebieg przepływu cząstek gazu na przodku mechanicznie kształtowanego chodnika przewozowego w kopalni podziemnej wykorzystującej system wentylacji kombinowanej i system natrysku rozpylającego do tłumienia pylenia przeprowadzono badania z wykorzystaniem modeli numerycznych. Dla celów symulacji użyto pakietu FLUENT - ogólnodostępnego systemu pomiaru dynamiki płynów w połączeniu z algorytmem SIMPLE. Wyniki modelu pokazują, że odpylanie winno koncentrować się na środkowej powierzchni przodka. Na podstawie uzyskanych wyników opracowano zamknięty system odpylania z kanalizacją. System przetestowano w kopalni z zadowalającym efektem.
6
Expression of ethylene biosynthetic and signaling genes in relation to ripening of banana fruit after cold storage
61%
Hong K. , Xie J. , Zou R. , Zhang E. , Xin M. , Huang M. , He Q.
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nr 11
EN
Banana fruit are highly sensitive to chilling injury (CI), while the effect of different degrees of CI on the subsequent fruit ripening is largely unknown. In the present work, ripening characteristic of banana fruit after storage at 7 ºC for 3 days or for 8 days, and expression levels of eight genes associated with ethylene biosynthetic and signaling, including MaACS1, MaACO1, MaERS1, MaERS3, and MaEIL1–4, were investigated. The results showed that banana fruit stored at 7 ºC for 8 days exhibited more severe chilling symptoms than those at 7 ºC for 3 days. Compared with banana fruit stored at 7 ºC for 8 days, which showed abnormal ripening, more decrease in fruit firmness, while higher increase in ethylene production and hue angle were observed in banana fruit stored at 7 ºC for 3 days, which could ripening normally. Moreover, gene expression profiles during ripening revealed that ethylene biosynthetic and signaling genes were differentially expressed in peel and pulp of banana fruit after storage at 7 ºC for 3 days and 7 ºC for 8 days. In the peel of fruit storage at 7 ºC for 3 days, expression levels of MaACS1, MaACO1, MaEIL1, and MaEIL2 increased remarkably while MaERS3, MaEIL1, and MaEIL4 were enhanced in the fruit after storage at 7 ºC for 8 days. In the pulp, with the exception of MaACO1 and MaERS3, expression levels of other genes did not exhibit a significant difference, between the banana fruit storage at 7 ºC for 3 days and 7 ºC for 8 days. Taken together, our results suggest that differential expression of ethylene biosynthetic and signaling genes such as MaERS3, MaACO1, and MaEIL2, may be related to ripening behavior of banana fruit with different degrees of CI after cold storage.
7
Content available Adsorption efficiency of pentafluorobenzene on ionic liquids-based silicas
61%
Wang X. , Lin L. , Xie J. , Yan X. , Xiao W. , Tian P.
Polish Journal of Chemical Technology
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2018
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tom Vol. 20, nr 3
47--52
EN
The adsorption of pentafl uorobenzene on nine ionic liquid-based silicas was investigated using solid phase extraction. The effects of several variables such as the type of ionic liquid groups, adsorption time, temperatures and water ratio in the solution system were experimentally evaluated. The imidazole-chloride ionic liquid group based silica exhibited the highest adsorption efficiency under the optimized conditions of 5 min adsorption at 30°C in water/methanol (30:70, vol%) solution. In addition, the effects of pH, as well as type and concentrations of chloride salts were investigated. At pH values other than neutral and high salt concentration, the adsorption efficiency was reduced. Finally, the relative standard deviation of less than 5.8% over a 5-day period showed a high precision for the nine tested sorbents.
8
Genetic mapping and salt tolerance of a novel D1-allelic mutant of rice (Oryza sativa L.)
51%
Tian W. , Zhang X. , Wang X. , Xie J. , Li Y. , Sun Y. , Tao Y. , Xiong Y. , Sang X.
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nr 08
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