Wyniki wyszukiwania - Biblioteka Nauki

1

Assembly Operation Optimization Based on A Hybrid Particle Swarm Optimization and Genetic Algorithm

100%

Xing Y. , Wang Y.

Przegląd Elektrotechniczny

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2013

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tom R. 89, nr 3b

119--121

EN

The assembly dimensional quality can be improved by optimizing the assembly operations between parts. Firstly, as there is large quantity of geometric feasible assembly sequences for the auto-body, the multi-attribute directed liaison graph is applied to describe the precedence relationships and assembly control characteristics between parts. Secondly, with assembly deviation propagation as the fitness function, the hybrid particle swarm optimization and genetic algorithm is proposed to optimize the assembly operations between parts. Finally, the optimal assembly sequence is selected through assembly variation propagating based on linear assembly variation analysis model. The optimization of the key control characteristics is illustrated by the auto-body side assembly.

PL

W artykule zaproponowano wykorzystanie hybrydowego połączenia optymalizacji rojem cząstek i algorytmu genetycznego w optymalizacji procesu montażu/łączenia części. Metoda bazuje na funkcji użyteczności wynikającej z propagacji błędu złożenia. Efekty działania zaprezentowano na przykładzie składania boku karoserii samochodu.

2

Aerobic power across positions - an investigation into women’s soccer performance

80%

Xing Y. , Chamera T. , Chen L. , Zhang S.

Annals of Agricultural and Environmental Medicine

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2023

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tom 30

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nr 4

3

Analyzing the bibliometric progress of sustainable monitoring and analysis of sports training loads

80%

Xing Y. , Bibi B. , Zhang Y. M. , Mushtaq R. T.

Annals of Agricultural and Environmental Medicine

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2023

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tom 30

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nr 2

4

The effects of litter layer and soil properties on the soil-atmosphere fluxes of greenhouse gases in karst forest, Southwest China

61%

Cheng J. , Lee X. , Zhou Z. , Wang B. , Xing Y. , Cheng H. , Tang Y.

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nr 1

EN

Temporal variation is a major source of the uncertainty in estimating the fluxes of the greenhouse gases (GHGs) in terrestrial ecosystems, and the GHG fluxes and its affecting factors in the karst region of southwest China remains weakly understood. Using the static chamber technique and gas chromatography method, the CO₂, CH₄ and N₂O fluxes were carried out between 9 and 11 a.m. at 15 day intervals from June 2008 to May 2009 in a Pinus massoniana forest. Two treatments were chosen for this study: undisturbed (soil with litter layer) and disturbed (surface litter removal). Both treatments were found to be the net source of atmospheric CO₂ and N₂O, but a sink of atmospheric CH₄. The seasonality of soil CO₂ emission coincided with the seasonal climate pattern, with high CO₂ emission rates in the hot-wet season and low rates in the cool-dry season. In contrast, seasonal patterns of CH₄ and N₂O fluxes were not clear, although higher CH₄ uptake rates were often observed in autumn and higher N₂O emission rates were often observed in spring (dry-wet season transition). The litter was active in GHG fluxes, and removal of the litter layer reduced soil CO₂ emission (17%) and increased CH₄ uptake (24%) whereas N₂O fluxes were not affected distinctly in the pine forest, indicating that litter layer had an important effect on C exchanges. In the pine forest, soil CO₂ emissions and CH₄ uptakes correlated significantly with soil temperature (r²= 0.87, P <0.01; r²= 0.34, P <0.05, respectively), but had no significant relationship with soil moisture. And there was a significant correlation between CH₄ flux and NH₄⁺-N (r²= 0.39, P < 0.05) and soil inorganic N (r²= 0.48, P <0.05), but no significant correlation was found between CH₄ flux and NO₃⁻-N. Moreover, we found a significant negative logarithmic correlation between N₂O flux and soil NO₃⁻-N concentration (r²= 0.41, P <0.05), and the relationship between CO₂ emission and soil inorganic N content (r²= 0.35, P < 0.05). These results suggested that soil temperature and mineral N dynamics largely affected the temporal GHG exchanges between forest soil and atmosphere.

5

Identifcation of novel and conserved microRNAs involved in fruit development and ripening in Fragaria vesca

61%

Han Y. , Chen G. , Zhou H. , Zhang Q. , Qin L. , Xing Y.

Acta Societatis Botanicorum Poloniae

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2019

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tom 88

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nr 2

6

Assessment of stress response and its interrelationship with external load in female soccer players

61%

Xing Y. , Zhang T. , Gorkovenko A. V. , Abramovych T. , Maznychenko A. , Sokolowska I.

Annals of Agricultural and Environmental Medicine

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2023

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tom 30

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nr 2

7

The effects of litter layer and soil properties on the soil-atmosphere fluxes of greenhouse gases in karst forest, Southwest China

61%

Cheng J. , Lee X. , Zhou Z. , Wang B. , Xing Y. , Cheng H. , Tang Y.

Polish Journal of Ecology

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2013

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tom Vol. 61, nr 1

79--92

EN

Temporal variation is a major source of the uncertainty in estimating the fluxes of the greenhouse gases (GHGs) in terrestrial ecosystems, and the GHG fluxes and its affecting factors in the karst region of southwest China remains weakly understood. Using the static chamber technique and gas chromatography method, the CO2, CH4 and N2O fluxes were carried out between 9 and 11 a.m. at 15 day intervals from June 2008 to May 2009 in a Pinus massoniana forest. Two treatments were chosen for this study: undisturbed (soil with litter layer) and disturbed (surface litter removal). Both treatments were found to be the net source of atmospheric CO2 and N2O, but a sink of atmospheric CH4. The seasonality of soil CO2 emission coincided with the seasonal climate pattern, with high CO2 emission rates in the hot-wet season and low rates in the cool-dry season. In contrast, seasonal patterns of CH4 and N2O fluxes were not clear, although higher CH4 uptake rates were often observed in autumn and higher N2O emission rates were often observed in spring (dry-wet season transition). The litter was active in GHG fluxes, and removal of the litter layer reduced soil CO2 emission (17%) and increased CH4 uptake (24%) whereas N2O fluxes were not affected distinctly in the pine forest, indicating that litter layer had an important effect on C exchanges. In the pine forest, soil CO2 emissions and CH4 uptakes correlated significantly with soil temperature (r2 = 0.87, P <0.01; r2 = 0.34, P <0.05, respectively), but had no significant relationship with soil moisture. And there was a significant correlation between CH4 flux and NH4+-N (r2 = 0.39, P < 0.05) and soil inorganic N (r2 = 0.48, P <0.05), but no significant correlation was found between CH4 flux and NO3--N. Moreover, we found a significant negative logarithmic correlation between N2O flux and soil NO3--N concentration (r2 = 0.41, P <0.05), and the relationship between CO2 emission and soil inorganic N content (r2 = 0.35, P < 0.05). These results suggested that soil temperature and mineral N dynamics largely affected the temporal GHG exchanges between forest soil and atmosphere.

8

Flotation behavior of hard-to-separate and high-ash fine coal

61%

Xing Y. , Gui X. , Liu J. , Cao Y. , Zhang Y. , Li S.

Physicochemical Problems of Mineral Processing

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2016

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tom Vol. 52, iss. 2

703--717

EN

The flotation behavior of hard-to-separate and high-ash fine coal was investigated using conventional flotation with constant power input. A new flotation process, based on energy input and distribution, was designed to lower the ash content of concentrate. The results obtained using Fourier transform infrared (FTIR) analysis show that the coal samples have good floatability because of many hydrophobic and few hydrophilic functional groups. Under a constant power input, a large number of ash-forming materials floated into a froth product at the start of flotation. Based on the Fuerstenau upgrading curves, it was determined that the 0.25-0.074 mm size fraction range showed the worst selectivity when compared with 0.50-0.25 mm and -0.074 mm size fractions. The desired concentrate with an ash content of 13.98%, 27.59% of ash recovery, and 80.01% combustible matter recovery could be obtained by transferring the excess energy of the flotation-conditioning stage to the pre-conditioning stage and increasing the power input step-by-step in the flotation-conditioning stage at equal total energy consumption.

9

Immunosensors for biomarker detection in autoimmune diseases

61%

Zhang X. , Zambrano A. , Lin Z.-T. , Xing Y. , Rippy J. , Wu T.

Archivum Immunologiae et Therapiae Experimentalis

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2017

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tom 65

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nr 2

10

Effect of intergrown particle liberation on difficult-to-separate coking coal flotation

61%

Gui X. , Liu J. , Cao Y. , Xing Y. , Deng Y. , Li S.

Physicochemical Problems of Mineral Processing

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2016

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tom Vol. 52, iss. 1

279--294

EN

Flotation tests with intergrown particle liberation were conducted to explore a separation method of difficult-to-separate coking coal from the Tangshan Kailuan mine in China. The particle size distribution, density and coal petrography were investigated. The difficult-to-separate coking coal sample resulted in intergrown particles, such as non-liberated coal and rocks. Thus, intergrown coal particle liberation and re-separation tests were conducted. The results showed that grinding time had a great effect on the flotation performance. Grinding prompted coal to dissociate and improve the surface hydrophobic properties of minerals. However, heterogeneous fine silt covered the surface of coal particles when coal was ground too long. The inorganic mineral particles were over-ground and reduced the contact angle of coal. The results of coal rock dissociation and laboratory re-separation tests showed that clean coal combustible recovery increased through intergrown particle liberation and re-separation.