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Search Results: 1 - 10 of 92534 matches for " Lin-Hong Jin "
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Synthesis of biodiesel from Jatropha curcas L. seed oil using artificial zeolites loaded with CH3COOK as a heterogeneous catalyst  [PDF]
Wei Xue, You-Chun Zhou, Bao-An Song, Xia Shi, Jun Wang, Shi-Tao Yin, De-Yu Hu, Lin-Hong Jin, Song Yang
Natural Science (NS) , 2009, DOI: 10.4236/ns.2009.11010
Abstract: An environmentally benign process was devel-oped for the transesterification of Jatropha curcas L. seed oil with methanol using artificial zeolites loaded with potassium acetate as a heterogeneous catalyst. After calcination for 5 h at 823 K, the catalyst loaded with 47 wt.% CH3COOK exhibited the highest efficiency and best catalytic activity. The easily prepared cata-lysts were characterized by means of X-ray dif-fraction and IR spectroscopy, as well as Hammett indicator titration. The results revealed a strong dependence of catalytic activity on ba-sicity. The optimum reaction conditions for transesterification of J. curcas oil were also in-vestigated. The methyl ester content in the bio-diesel product exceeded 91% after 4h reaction at reflux temperature in the presence of 2% solid catalyst and no water washing process is needed during workup.
Asymmetric Synthesis of α-Aminophosphonates Using the Inexpensive Chiral Catalyst 1,1’-Binaphthol Phosphate
Weiming Xu,Sha Zhang,Song Yang,Lin-Hong Jin,Pinaki S. Bhadury,De-Yu Hu,Yuping Zhang
Molecules , 2010, DOI: 10.3390/molecules15085782
Abstract: Asymmetric addition under mild conditions of dialkyl phosphites on aldimines derived from cinnamaldehyde catalyzed by the inexpensive chiral organocatalyst (R)-3,3’-[4-fluorophenyl]2-1,1’-binaphthol phosphate has been found effective to give new α-amino-phosphonates 9 in moderate yields (30–65%) and enantiomeric excess (8.4%–61.9%).
Synthesis and Bioactivity of a-Aminophosphonates Containing Fluorine
Bao-An Song,Yang-Lan Wu,Song Yang,De-Yu Hu,Xiang-Qiong He,Lin-Hong Jin
Molecules , 2003, DOI: 10.3390/80100186
Abstract: Twenty-one a-aminophosphonates containing fluorine were synthesized by Mannich-type reactions. Their structures were established by elemental analysis, IR, 1H- NMR and MS. In field tests, some of these new compounds display high antiviral activity against the tobacco mosaic virus (TMV). The molecular geometry of compound 4f was determined by X-ray diffraction structure analysis.
Chemical Constituents of Caesalpinia decapetala (Roth) Alston
Xiao-Hua Wei,Sheng-Jie Yang,Na Liang,De-Yu Hu,Lin-Hong Jin,Wei Xue,Song Yang
Molecules , 2013, DOI: 10.3390/molecules18011325
Abstract: The current study targets the chemical constituents of Caesalpinia decapetala (Roth) Alston and investigates the bioactivities of the isolated compounds. Fourteen known compounds were isolated using column chromatography, and structural identification was performed by physical and spectral analyses. The biological activities of the compounds were also evaluated by 3-(4,5-dimethythiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) and 2,2-diphenlyl-1-picrylhydrazyl (DPPH) assays. Emodin ( 6), baicalein ( 9), and apigenin ( 12) displayed antitumor activities against the MGC-803 cell line, while quercetin ( 2), rutin ( 5), baicalein ( 9), and epicatechin ( 13) showed stronger DPPH scavenging activities compared with ascorbic acid. Andrographolide ( 1), quercetin ( 2), bergenin ( 4), rutin ( 5), emodin ( 6), betulin ( 7), baicalein ( 9), polydatin ( 10), salicin ( 11), and apigenin ( 12), were obtained from C. decapetala (Roth) Alston for the first time.
Synthesis, Antiviral and Antifungal Bioactivity of 2-Cyano-acrylate Derivatives Containing Phosphonyl Moieties
Yin-Pu Lv,Xian-You Wang,Bao-An Song,Song Yang,Kai Yan,Guang-Fang Xu,Pinaki S Bhadury,Fang Liu,Lin-Hong Jin,De-Yu Hu
Molecules , 2007, DOI: 10.3390/12050965
Abstract: Alkyl 2-cyano-3-methylthio-3-phosphonylacrylates were synthesized by the reaction of alkyl 2-cyano-3,3-dimethylthioacrylates with dialkyl phosphites. The structures of the new compounds were characterized by elemental analyses, IR, 1H-, 13C- and 31P-NMR spectral data. These compounds were tested in vitro against pathogenic fungi, namely, Fusarium graminearum, Cytospora mandshurica and Fusarium oxysporum. Amongst all compounds, 2d and 2t were found to be effective against the tested fungi at 50μg/mL. A half-leaf method was used to determine the in vivo protective, inactivation and curative efficacies of the title products against tobacco mosaic virus (TMV). Title compounds 2a and 2b were found to possess good in vivo curative, protection and inactivation effects against TMV with inhibitory rates at 500 mg/L of 60.0, 89.4 and 56.5 and 64.2, 84.2 and 61.2 %, respectively. To the best of our knowledge, this is the first report on the antiviral and antifungal activity of alkyl 2-cyano-3-methylthio-3-phosphonylacrylates.
Analytical Potential Energy Function for the Ground State X^{1} Sigma^+ of LaCl
Lin-Hong Chen,Ren-Cheng Shang
Physics , 2002,
Abstract: The equilibrium geometry, harmonic frequency and dissociation energy of lanthanum monochloride have been calculated at B3LYP, MP2, QCISD(T) levels with energy-consistent relativistic effective core potentials. The possible electronic state and reasonable dissociation limit for the ground state are determined based on atomic and molecular reaction statics. Potential energy curve scans for the ground state X^{1} Sigma^+ have been carried out with B3LYP and QCISD(T) methods due to their better performance in bond energy calculations. We find the potential energy calculated with QCISD(T) method is about 0.5 eV larger than dissociation energy when the diatomic distance is as large as 0.8 nm. The problem that single-reference ab initio methods don't meet dissociation limit during calculations of lanthanide heavy-metal elements is analyzed. We propose the calculation scheme to derive analytical Murrell-Sorbie potential energy function and Dunham expansion at equilibrium position. Spectroscopic constants got by standard Dunham treatment are in good agreement with results of rotational analyses on spectroscopic experiments. The analytical function is of much realistic importance since it is possible to be applied to predict fine transitional structure and study reaction dynamic process.
Text Affective Computing from Cognitive Perspective
认知视角下的文本情感计算

XU Lin-hong,LIN Hong-fei,
徐琳宏
,林鸿飞

计算机科学 , 2010,
Abstract: This paper applied the cognitive pragmatic and emotion psychology to the text affective computing. Based on Lazarus's cognitive evaluation theory and cognitive context of the cognitive pragmatic, a new text affective model was presented which processes the negation through acquiring contradictory emotion from affective corpus, and affective schema utilized for improving precision of affective recognition. This paper broadened the dimension of the researches, and provided a possible candidate solution for text affective computing. The experiment results show that the text affecfive cognition model is effective.
TESTING STUDY ON CHARACTERISTICS OF STRENGTH AND DEFORMATION FOR COARSE MATERIALS
土石粗粒料的强度和变形特性的试验研究

XIE Wan-li,WANG Jia-ding,ZHANG Lin-hong,
谢婉丽
,王家鼎,张林洪

岩石力学与工程学报 , 2005,
Abstract: Based on the stress path of dam,the triaxialtests of coarse materials are carried out with constantratios of the principal stresses and the stress increments to obtain the corresponding stress-strain relationship of course materials. According to the strength characteristics of coarse materials,a function is determined to describe the yield criterion of coarse materials. Based on this yield criterion and elasto-plastic theory,an elasto-plastic constitutive model for coarse materials is established. It can be expressed in invariants with clear concept,noodd dots and less parameters. In order to apply it to finite element method,the elasto-plastic matrix is deduced. It is shown that the stress-strain relations hip of coarse materials is in good agreement with experimental data.
Optically-thick accretion discs with advection
Optically—thick accretion discs with advection

Chen Lin-Hong,Wu Mei,Shang Ren-Cheng,
陈林红
,吴枚,尚仁成

中国物理 B , 2002,
Abstract: The structures of optically-thick accretion discs with radial advection have been investigated by the iteration and integration algorithms. The advective cooling term changes mostly the inner part of disc solution, and even results in an optically-thick advection-dominated accretion flow (ADAF). Three distinct branches-the outer Shakura-Sunyaev disc (SSD), the inner ADAF and the middle transition layer-are found for a super-Eddington disc. The SSD-ADAF transition radius can be estimated as 18(\dot{M}/\dot{M}E)RG where RG is the Schwarzschild radius, \dot{M} is the mass accretion rate and \dot{M}E is the Eddington accretion rate. SSD solutions calculated with the iteration and integration methods are identical, while ADAF solutions obtained by these two methods differ greatly. Detailed algorithms and their differences have been analysed. The iteration algorithm is not self-consistent, since it implies that the dimensionless advection factor ξ is invariant, but in the inner ADAF region the variation of ξ is not negligible. The integration algorithm is always effective for the whole region of an optically-thick disc if the accretion rate is no smaller than 10-4\dot{M}E. For optically-thin discs, the validity of these two algorithms is different. We suggest that the integration method be employed to calculate the global solution of a disc model without assuming ξ to be a constant. We also discuss its application to the emergent continuum spectrum in order to explain observational facts.
Temperature-Induced Phase Transition of In2O3 from a Rhombohedral Structure to a Body-Centered Cubic Structure

YANG Lin-Hong,DONG Hong-Xing,SUN Zheng,SUN Liao-Xin,SHEN Xue-Chu,CHEN Zhang-Hai,

中国物理快报 , 2011,
Abstract:
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