OALib Journal期刊

ISSN: 2333-9721




2018 ( 2 )

2017 ( 188 )

2016 ( 223 )

2015 ( 2531 )


匹配条件: “ Xinzhi Chen” ,找到相关结果约74403条。
Carbohydrate-Derived Organocatalysts for the Reduction of Imines with Trichlorosilane  [PDF]
Xin Ge, Chao Qian, Xinzhi Chen
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.36008

The backbone of D-glucosamine hydrochloride was fine-tuned and modified by protecting the hydroxyl groups. In order to reduce imines with trichlorosilane, the carbohydrate-derived organocatalysts were prepared and screened. Methyl-4,6-O-benzylidene-2-amino-2-deoxy-α-D-glucopyr anoside was found as the best catalyst. The reduction was proceeded under CHCl3 as solvent at 40?C, affording 68% - 94% yield.

2-Methylsulfanyl-5,6-dihydro-2H-1,3-dithiolo[4,5-b][1,4]dioxin-2-ium tetrafluoroborate
Guoquan Zhou,Xinzhi Chen
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812005326
Abstract: The title compound, C6H7O2S3+·BF4 , consists of a planar 2-thioxo-1,3-dithiol-4,5-yl unit [maximum deviation from the ring plane = 0.020 (3) ], with an ethylenedioxy group fused at the 4,5-positions; the ethylenedioxy C atoms are disordered over two positions with site-occupancy factors of 0.5. The 1,4-dioxine ring has a twist-chair conformation. Weak cation–anion S...F interactions [3.022 (4)–3.095 (4) ] and an S...O [3.247 (4) ] interaction are present.
Guoquan Zhou,Xinzhi Chen
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812001407
Abstract: In the title compound, C8H5NOS2, the non-H atoms are approximately coplanar [maxium deviation = 0.060 (3) ]. The dihedral angle between the least-squares planes of the pyridine and 1,3-dithiol-2-one rings is 5.96 (17)°. The crystal packing is stabilized by weak intermolecular C—H...O hydrogen bonds and by an S...S close contact [3.510 (5) ].
Possible role of inositol phospholipid signal transduction system inDunaliella salina under hypoosmotic shock
Sixue Chen,Lin Li,Jiqiong Yan,Zhengkai Xu,Xinzhi Jiao
Chinese Science Bulletin , 1997, DOI: 10.1007/BF03182791
Isolation of β-Carotene from Discarded Tobacco Leaves
烟叶中β -胡萝卜素的分离纯化和测定

XIA Wei,CHEN Xinzhi,

色谱 , 2004,
Abstract: Beta-carotene was isolated from discarded tobacco leaves by column chromatography using petroleum ether as eluent. Its structure was characterized by 1H-NMR and 13C-NMR spectra. The purity of the beta-carotene was determined to be 98% by a high performance liquid chromatographic (HPLC) method which was demonstrated to be accurate and reproducible. Infra-red spectrum and melting point of the isolated sample were also characterized in agreement with those reported in literature. The overall yield of 80%, the high purity and the easiness to recycle as the results of only a single solvent employed, would make the method an important reference for future research of beta-carotene and a favorable technique for future development.
Editor’s note
XinZhi Wu
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0672-7
On (h0,h)-stability of autonomous systems
Xinzhi Liu
International Journal of Stochastic Analysis , 1992, DOI: 10.1155/s1048953392000285
Abstract: In this paper, we discuss the qualitative behavior of a map h along solutions of an autonomous system whose initial values are measured by a second map h0. By doing this, we may deal with, in a unified way, several concepts and associated problems, which are usually considered separately. Five theorems on asymptotic stability are given and two examples are worked out.
Nonlinear boundary value problems for first order impulsive integro-differential equations
Xinzhi Liu
International Journal of Stochastic Analysis , 1989, DOI: 10.1155/s1048953389000146
Abstract: In this paper, we investigate a class of first order impulsive integro-differential equations subject to certain nonlinear boundary conditions and prove, with the help of upper and lower solutions, that the problem has a solution lying between the upper and lower solutions. We also develop monotone iterative technique and show the existence of multiple solutions of a class of periodic boundary value problems.
Application of Knowledge about Bioinformatics in Editing Medical Periodicals


中国科技期刊研究 , 2009,
Abstract: 生物信息学是一门新兴的综合性学科,医学编辑在实际工作中经常会遇到与生物信息学相关数据库的应用问题。医学编辑应该重视生物信息学的学习和应用,为审稿提供强有力的支持,从而提高审稿质量。
Magnetization Characteristic of Ferromagnetic Thin Strip by Measuring Anisotropic Magnetoresistance and Ferromagnetic Resonance
Ziqian Wang,Guolin Yu,Xinzhi Liu,Bo Zhang,Xiaoshuang Chen,Wei Lu
Physics , 2013, DOI: 10.1016/j.ssc.2013.11.034
Abstract: The magnetization characteristic in a permalloy thin strip is investigated by electrically measuring the anisotropic magnetoresistance and ferromagnetic resonance in in-plane and out-of-plane configurations. Our results indicate that the magnetization vector can rotate in the film plane as well as out of the film plane by changing the intensity of external magnetic field of certain direction. The magnetization characteristic can be explained by considering demagnetization and magnetic anisotropy. Our method can be used to obtain the demagnetization factor, saturated magnetic moment and the magnetic anisotropy.

Copyright © 2008-2017 Open Access Library. All rights reserved.