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Search Results: 1 - 10 of 161056 matches for " Yue-Lin Li "
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Effect of Microwave Sintering on the Microstructure and Dielectric Properties of Bi2O3-Doped (Ba0.6Sr0.4)(Ti0.94Cu0.06)O3 Ceramics  [PDF]
Yue-Lin Li, Ta-Chih Cheng, Ying-Chieh Lee
New Journal of Glass and Ceramics (NJGC) , 2014, DOI: 10.4236/njgc.2014.41001

The effects of microwave sintering on the sintering behaviour, microstructure and dielectric properties of Bi2O3-doped (Ba0.6Sr0.4)(Ti0.94Cu0.06)O3 (BSTC) ceramics were investigated. The microstructure and dielectric properties of a BSTC ceramic were also studied given different amounts of Bi2O3 doping. Microwave heating with sintering temperatures below 1000°C significantly improves the densification of Bi2O3-doped BSTC ceramics. The BSTC ceramic with 1 wt% Bi2O3 addition sintered at 950°C in air for 30 min exhibited dielectric properties of er = 3756, dielectric loss of tanδ = 7 × 10-3 and bulk density > 96% of theoretical density.

Climate divison of tea tree cultivated limit in China

Jiang Yue-lin,Li Zhuo,
,李 倬

中国生态农业学报 , 2000,
Abstract: 分析了气候因子与我国茶树栽培界限的关系,发现冬季低温条件是茶树栽培北界和垂直高度界限的决定因子。将年极端最低气温≤-15℃和≤-5℃低温出现频率10%分别作为划分灌木中小叶型茶树和乔木大叶型茶树栽培北界的气候指标,划分出茶树的栽培北界。灌木中小叶型茶树栽培北界位于射阳、蚌埠、信阳、商县、武都、泸定、德钦、林芝到错那一线;乔木大叶型茶树栽培北界位于温州、龙岩、韶关、榕江、广南、昆明到六库一线。用年极端最低气温多年平均值-10℃和-3℃作为2种生态类型茶树栽培垂直高度界限指标,推算出茶树栽培垂直高度界限在440~2130m之间。
Effect of Annealing on the Structure and Photoluminescence of Eu-Doped ZnO Nanorod Ordered Array Thin Films
Wen-Wu Zhong,Da-Wei Guan,Yue-Lin Liu,Li Zhang
Journal of Nanomaterials , 2012, DOI: 10.1155/2012/263679
Synthesis, characterization and nhexane catalytic cracking activity of zinc-substituted aluminophosphate molecular sieves (ZnAPO-5)
FENG Li-li,QI Xing-yi,LI Jun-ying,ZHU Yue-lin,ZHU Li-qun
燃料化学学报 , 2008,
Enantioseparation and Absolute Configuration Determination of Angular-Type Pyranocoumarins from Peucedani Radix Using Enzymatic Hydrolysis and Chiral HPLC-MS/MS Analysis
Yue-Lin Song,Qing-Wen Zhang,Ya-Ping Li,Ru Yan,Yi-Tao Wang
Molecules , 2012, DOI: 10.3390/molecules17044236
Abstract: Angular-type pyranocoumarins from Peucedani Radix (Chinese name: Qian-hu) have exhibited potential for use on treatment of cancer and pulmonary hypertension. Due to the existence of C-3′ and C-4′ chiral centers, compounds belonging to this chemical type commonly exist in enantiomers and/or diastereoisomers, which may elicit distinct activities during their interactions with the human body. In the present study, a new method, which combines enzymatic hydrolysis with chiral LC-MS/MS analysis, has been developed to determine the absolute configurations of these angular-type pyranocoumarins. Pyranocoumarins isolated from Qian-hu, their enantiomers, or metabolites were individually incubated with rat liver microsomes. As the common end product from enzymatic hydrolysis of all tested pyranocoumarins, cis-khellactone was collected and its absolute configuration was determined by comparison with (+)-cis-khellactone and (?)-cis-khellactone using chiral LC-MS/MS. The absolute configurations of all tested parent pyranocoumarins were determined by combination of LC-MS/MS, NMR and polarimetric analysis. The results revealed that the metabolite cis-khellactone retained the same absolute configurations of the stereogenic carbons as the respective parent compound. This method was proven to be rapid and sensitive and also has advantages in discriminating single enantiomers and mixtures of optical isomers with different ratios.
Ecoanatomical Study on Leaf Characteristics of Dominant Species in Different Succession Stages of Forest Communities in Dinghushan

PENG Shao-lin,LI Yue-lin,YU Hu,REN Hai,

热带亚热带植物学报 , 2002,
Abstract: Leaf ecoanatomicalcharacteristicswere studiedof eightdominantspeciesin three successional stagesof forestcommunityin Dinghushan,Guangdong,China.Thetrendof successionof the communitiesin Dinghushanwas from coniferousforestdominatedby Pinus massoniana to coniferousandbroadleavedmixedforestdominatedby Pinus massoniana,Schima superba,Castanopsis chinensis and Cryptocarya concinna,and to monsoonevergreenbroadleavedforestdominatedby Cryptocarya concinna,C.chi nen sis,Castanopsis chinensis,Schima superba,Syzygium rehderianum,Aporosa yunnanensis andBlastus cochinchinensis.In thispaper,thestudyof leafanatomyincludedthe diterminationof leafthickness,adaxialandabaxialcuticularthickness,palisadeandspongytissues thickness,as wellas tracheidandresinductdiameters.As comparedto coniferousforest,thethickness of needles,and thicknessof adaxialand abaxialcuticlesof Pinus massoniana in mixedforestwere thinner,andthediametersof tracheidsandresinductsweresmaller.As comparedto mixedforest, laminathicknessand spongytissuethickness(S)of Castanopsis chinensis increasedin monsoon evergreenbroadleavedforest,whereaspalisadetissuethickness(P),andP/Sreduced.As forSchima superba andCryptocarya concinna,laminathickness,P andS thickness,andP/Salldecreasedto a certainextentin monsoonevergreenbroadleavedforest.Significantdifferenceswereobservedin needle thickness,adaxialandabaxialcuticlesthicknessin Pinus massoniana betweenconiferousforestand mixedforest.Such differences were also seen in laminathicknessand P thicknessin Castanopsis chinensis,Schima superba andCryptocarya concinna betweenmixedforestandmonsoonevergreen broadleavedforest.
A Low Voltage Driven Digital-Droplet-Transporting-Chip by Electrostatic Force

GAO An-Ran,LIU Xiang,GAO Xiu-Li,LI Tie,GAO Hua-Min,ZHOU Ping,WANG Yue-Lin,

中国物理快报 , 2011,
Effect of Annealing on the Structure and Photoluminescence of Eu-Doped ZnO Nanorod Ordered Array Thin Films
Wen-Wu Zhong,Da-Wei Guan,Yue-Lin Liu,Li Zhang,Yan-Ping Liu,Zhi-Gang Li,Wei-Ping Chen
Journal of Nanomaterials , 2012, DOI: 10.1155/2012/263679
Abstract: Eu-doped ZnO nanorod ordered array thin films were synthesized on glass substrates with a ZnO seed layer via hydrothermal method. XRD reveals that the (002) diffraction peak of films annealed in hydrogen is sharper than that annealed in air. SEM reveals that the nanorods of films annealed in hydrogen are shortened and widened. TEM results demonstrate that the nanorods are single crystalline and the lattice spacing of 0.52?nm agrees with the spacing of (001) crystal planes along -axis. Room temperature photoluminescence (PL) reveals that the PL of films annealed in hydrogen is the strongest and shifts to lower wavenumber. The point defect of Eu-doped ZnO nanorod array thin film is transferred from to by annealing in hydrogen. 1. Introduction Zinc oxide is an important member in the II–VI family with a wide band gap (3.37?eV) and a large excitonic binding energy (60?meV) [1–5]. Furthermore, ZnO is one of the environmental friendly materials, and the impurity-doped ZnO nanocrystals emitting visible light are expected to be appropriate materials for flat panel displays, florescence labels for biological imaging, and so on [6]. High quality II–VI semiconductor nanocrystals also become materials for doping of optically active impurities. The II–VI semiconductor nanocrystals doped with luminescence centers exhibit efficient luminescence even at room temperature [7–9]. Rare-earth ions are unique dopants, because they are optically and magnetically active in the semiconductor host crystals [10]. It is anticipated that in impurity-doped ZnO, strong interactions between the quantum-confined carriers and localized electrons on impurities will produce efficient photoluminescence (PL) [11, 12]. Eu is an attractive dopant for red emission in the range of 540–665?nm and the Eu-related luminescence lines are found to be a strong function of the structural quality and thermal cycling in the case of GaN [13]. In addition, nanorod thin films have some interesting properties. Among various synthesis methods, the hydrothermal method is attractive through which ZnO nanorods can be fabricated at low cost [14]. Despite various ZnO nanostructures that have been produced, few work has been executed on the synthesis of rod-like Eu-doped ZnO array thin films. In our work, via a low-temperature (70°C) hydrothermal synthesis, we present a nontoxic, large-scale, and low-cost method of preparing morphology-controlled Eu-doped nanorod ZnO array thin films on glass substrates with ZnO seed layer, and the effects of annealing atmosphere and Eu-doping on crystalline orientation and


物理学报 , 1990,
Abstract: A collisional-radiative numerical model is developed for studies of radiative losses and ion abundances in aluminum plasmas. Atomic processes such as collisional ionization and recombination, collisional excitation and dexcitation, radiation recombination, and spontaneous radiation are included. The dynamic results of ion abundances, radiation losses are discussed under the approximation of constant ion density and optically thin condition.
Studies on High Efficient System for in vitro Shoot Regeneration from Hypocotyls of Chinese Cabbage

ZHU Li-Hua~,ZHANG Cai-Qin~,SHENG Xiao-Guang~,ZHU Yue-Lin~,

植物科学学报 , 2005,
Abstract: 以大白菜的下胚轴为外植体,比较了不同浓度TDZ和6-BA两种细胞分裂素与不同浓度NAA相配合的培养基上不定芽再生的差异,并利用筛选出的高效再生培养基研究外植体苗龄、切段来源、接种方式以及品种对不定芽再生的影响。结果表明:与6-BA相比,TDZ对诱导下胚轴不定芽再生更有效,在M S+TDZ 0.3 m g.L-1+NAA0.5 m g.L-1+A gNO35 m g.L-1的培养基上,下胚轴不定芽再生频率高达87.8%,平均每下胚轴再生不定芽数也达到15.1个;3~5 d苗龄之间的下胚轴不定芽再生能力无显著差异,再生频率均达到80%以上,此后随着苗龄的增加,不定芽分化频率快速下降,苗龄为7 d时再生频率只有51.1%;下胚轴不同切段不定芽再生能力由强到弱表现为:上部切段>中部切段>下部切段;以正插(形态学下端插入培养基)方式接种的外植体不定芽再生能力显著大于反插(形态学上端插入培养基)和平放的;不同品种大白菜下胚轴的不定芽再生能力有一定差异。
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