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Articles by Yuan Liu
Total Records ( 3 ) for Yuan Liu
  Han-Wu Zhang , Xiao-Rong Wang , Bi-Feng Zhong , Wu-Feng Xia , Yuan Liu and Qing Chen
  Genetic relationships among 17 bramble cultivars introduced abroad and 11 wild excellent Rubus germplasms from China were analyzed by RAPD markers. A total of 500 DNA bands were amplified by 22 primers and 490 out of 500 bands (98%) were polymorphic. The average number of polymorphic DNA bands amplified by each primer was 22.28. All materials could be distinguished by RAPD markers with 0.687-0.964 genetic similarity coefficients. According to the data, a dendrogram of genetic relationship, which was constructed using the UPGMA method, showed that all the tested cultivars and wild species (varieties) were classified into four groups. The present results verify that the close genetic relationship between ten raspberry cultivars and seven excellent wild germplasms from section (subgenus) Idaeobatus of the genus Rubus, while a little far genetic relationship between ten raspberry cultivars and seven blackberry cultivars. There was a far genetic relationship between seven wild germplasms from section (subgenus) Idaeobatus and four wild germplasms from section (subgenus) Malachobatus. The two cultivated bramble groups (raspberry and blackberry) could be completely distinguished, but it was failed to distinguish red raspberry with even red raspberry in raspberry group.
  Zhou-jun Wang , Yuan Liu , Peng Shi , Chang-jun Liu and Yan Liu
  This work aimed at elucidating the beneficial effect of plasma treatment on the catalytic performance of palladium (Pd) catalysts in methane combustion with the ordered mesoporous molecular sieve Al-MCM-41 as the model support. The plasma treated Pd/Al-MCM-41 catalyst exhibited a higher initial activity and a better stability in comparison with the untreated counterpart catalyst. To clarify the plasma effect, the catalysts were characterized by N2 sorption analysis, X-ray diffraction (XRD), temperature-programmed desorption of ammonia (NH3-TPD), pyridine adsorption-infrared spectroscopy (Py-IR), high resolution-transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (CH4-TPR) experiments. The results obtained confirmed that palladium oxide (PdO) was the active phase. Plasma treatment enhanced the acidity of catalyst and improved the dispersion of PdO particles, which lead to a higher initial activity. The better stability for plasma treated Pd-based catalyst was proved to be closely related to the stronger interaction between palladium oxide and the molecular sieve support. In addition, the sintering of PdO particles over the plasma treated catalyst was not significant during the stability test. These findings may provide useful guidelines for further catalyst design for methane combustion.
  Wen X. Liu , Han Dou , Zhi C. Wei , Biao Chang , Wei X. Qiu , Yuan Liu , Shu Tao , Wen X. Liu , Han Dou , Zhi C. Wei , Biao Chang , Wei X. Qiu , Yuan Liu and Shu Tao
  Emission properties of polycyclic aromatic hydrocarbons (PAHs) from combustion of six residential coals in North China were investigated. The results indicated that, the total emission factors (EFs) for 15 PAH species in gaseous and particulate phases ranged from 52.8 to 1434.8 mg/kg with a decreasing sequence of local bituminous coals and anthracite coals, and honeycomb briquettes were largely dependent on the raw coals used to produce them. Particulate phase, dominated by median or high molecular weight components, made a major contribution (68.8%–76.5%) to the total EFs for bituminous coals, while gaseous phase with principal low molecular weight species accounted for most (86.3%–97.9%) of the total EFs for anthracite coals. The phase partitioning of PAH emission for honeycomb briquettes was similarly dependent on the crude coals. The total EFs, phase partitioning and component profiles of emitted PAHs were mainly influenced by the inner components of the studied coals. Burning mode and flue number on household coal-stoves also affected the emission characteristics by means of the oxygen supply. A sum of seven carcinogenic PAHs, benzo(a)pyrene(BaP)-equivalent carcinogenic power and total toxicity potency expressed in 2,3,7,8-tetrachlorodibenzo-dioxin(TCDD) toxic equivalence exhibited that bituminous coals and produced honeycomb briquettes had remarkably elevated values. Fluoranthene, benzo(b)fluoranthene, benzo(k)fluoranthene, chrysene and indeno(1,2,3-cd)pyrene from anthracite coals showed higher levels of BaP-based toxic equivalent factor, though the other toxicity indices were rather low for this type of coal.
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