oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 23 )

2018 ( 107 )

2017 ( 97 )

2016 ( 97 )

Custom range...

Search Results: 1 - 10 of 8454 matches for " Lijun Wan "
All listed articles are free for downloading (OA Articles)
Page 1 /8454
Display every page Item
Adlayer structure of TCNQ molecules on Cu(111): Anin situ STM study
Lijun Wan,Itaya Kingo
Chinese Science Bulletin , 2001, DOI: 10.1007/BF03183267
Abstract: In situ electrochemical scanning tunneling microscopy (STM) was employed to examine tetracyanoquinodimethane (TCNQ) layer adsorbed on Cu(111) electrode surface in 0.1 mol/L HClO4 solution. The TCNQ molecules are found to form highly-ordered long range adlayer with a (4 × 4) symmetry. Each TCNQ molecule is adsorbed on Cu(111) surface in flat-lying orientation. The molecules are preferentially aligned with their long axes in the [1ˉ21 ] direction. A structural model is proposed for the adlayer.
Exploration on Student-Centered Fermentation Engineering Course by Problems Conducted Teaching  [PDF]
Lijun Ge, Zhenhong Zhu, Qin Yu, Haitong Wan
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.42012
Abstract:

Based on the feature of Fermentation Engineering Course, Study on student-centered classroom teaching by new teaching modes and methods to stimulate students’ learning motivation and develop students’ innovating ability. Combines problem based learning (PBL) with case based learning (CBS) teaching methods. In the process of teaching, guiding the students to think actively through questions, and participation in class discussion, courseware, simulation teaching, etc. and guiding students to analyze and solve problems, construction guide classroom teaching model. The resultsshow that the student’s initiative, enthusiasm and learning effectwereimproved obviously. And the way of teaching achieved good teaching results, which not only highlightedthe student-centered teaching philosophy, but also learnedthe advantages of a wide range of teaching methods.

Comparative Study of Global Seismicity on the Hot Engine Belt and the Cooling Seismic Belt—Improvement on Research Ideas of Earthquake Prediction  [PDF]
Lijun Chen, Xiaofeng Chen, Fangfang Wan, Pinzhong Li, Lei Shao
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.67060
Abstract: The study in this paper analyzes and compares the distribution on the global engine active seismic zone and cooling seismic belt basing on the ANSS earthquake catalog from Northern California Earthquake Data Center. An idea of the seismogenesis and earthquake prediction research is achieved by showing the stratigraphic structure in the hot engine belt. The results show that the main engine and its seismic cones are the global seismic activity area, as well as the subject of global geological disaster. Based on the conjecture of other stratum structure, the energy of crustal strong earthquake and volcano activities probably originates from the deep upper mantle. It is suggested that the research on earthquake and volcano prediction should focus on the monitor and analysis on the sub-crustal earthquake activities.
Adlayer structure of TCNQ molecules on Cu(111): An in situ STM study

WAN Lijun,Kingo Itaya,

科学通报(英文版) , 2001,
Abstract: In situ electrochemical scanning tunneling microscopy (STM) was employed to examine tetracyano- quinodimethane (TCNQ) layer adsorbed on Cu(111) electrode surface in 0.1 mol/L HClO4 solution. The TCNQ molecules are found to form highly-ordered long range adlayer with a (4×4) symmetry. Each TCNQ molecule is adsorbed on Cu(111) surface in flat-lying orientation. The molecules are preferentially aligned with their long axes in the 121] direction. A structural model is proposed for the adlayer.
Silicon-based nanomaterials for lithium-ion batteries
YaXia Yin,LiJun Wan,YuGuo Guo
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-012-5017-2
Abstract: Silicon-based nanomaterials have been of scientific and commercial interest in lithium-ion batteries due to the low cost, low toxicity, and high specific capacity with an order of magnitude beyond that of conventional graphite. The poor capacity retention, caused by pulverization of Si during cycling, triggers researchers and engineers to explore better battery materials. This review summarizes recent work in improving Si-based anode materials via different approaches from diverse Si nanostructures, Si/metal nanocomposites, to Si/C nanocomposites, and also offers perspectives of the Si-based anode materials.
Structure of self-assembled monolayer of NPAN on Au(111) electrode
Guangzheng Yang,Qingdao Zeng,Lijun Wan,Chunli Bai
Chinese Science Bulletin , 2003, DOI: 10.1007/BF03183985
Abstract: Adsorption of 4-(4-nitrophenylazo)-l-naphthol (NPAN), an azobenzene derivative, on Au(111) has been investigated in aqueous HC1O4 solution by using the cyclic voltammetry and scanning tunneling microscopy (STM). The molecule is found to form a stable monolayer on the electrode with a (6×4) structure relative to the underlying Au(111) lattice. Cyclic voltammograms show that the redox reactions occurring on the electrode are retarded by the formation of the monolayer. A structural model is proposed for the two-dimensional adlayer.
Supercapacitor-battery hybrid energy storage devices from an aqueous nitroxide radical active material
Wei Guo,Sen Xin,MengBo Ji,YuGuo Guo,LiJun Wan
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4575-z
Abstract: A hybrid electrochemical energy storage device was fabricated in aqueous NaOH with the 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) nitroxide radical as the active material, hydroquinone as the counter electrode active material, and an OH -selective separating membrane. The working principle of this device was investigated and it can be considered as a supercapacitor-battery hybrid energy storage system. Device performance was characterized by cyclic voltammetry and galvanostatic charge-discharge testing. When using multi-walled carbon nanotubes (MWCNTs) as electrode support materials, a high pseudo-capacitance of 1280 F g 1 was obtained with the TEMPO nitroxide radical as the active material at a 1 mV s 1 scan rate. This was ~33 times larger than the inherent double layer capacitance of MWCNTs. The electrode material and active material dissolved in solution could potentially be substituted with similar materials. This simple design provides a new approach for fabricating high performance supercapacitor-battery hybrid energy storage devices.
Controlled assembly of copper phthalocyanine with 1-iodooctadecane
Shengbin Lei,Chen Wang,Lijun Wan,Chunli Bai
Chinese Science Bulletin , 2003, DOI: 10.1007/BF03183952
Abstract: The binary assembly behavior of 1-iodooctadecane with substituted phthalocyanine (Pc) is studied using the scanning tunneling microscopy (STM). By altering the substituted alkyl groups attached to the phthalocyanine ring, either uniform assembly or phase separation behavior can be observed. It is suggested that the strength of intermolecular interaction between phthalocyanine molecules is the determining factor for the assembly structure.
2D self-assembly of 1,3,2-dioxaborine derivatives on HOPG
JiQun Lu,CunJi Yan,HuiJuan Yan,LiJun Wan
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0341-7
Abstract: Two-dimensional (2D) self-assembly of two 1,3,2-dioxaborine derivatives was investigated by STM. The molecules consist of π system and steric end groups. A droplet of toluene solution containing the molecules was deposited onto HOPG for preparing the assemblies. STM images showed that the molecular structures affect the assembly structure. The dipole-dipole interaction and steric repulsion played important roles in the formation of the self-assembled monolayers.
Self-assembled structure of alkyloxy substituted benzoic acid methyl ester on HOPG: An STM study
Qunhui Yuan,Jun Lu,Lijun Wan,Chunli Bai
Chinese Science Bulletin , 2004, DOI: 10.1360/04wb0090
Abstract: Self-assembled structures of 3,4,5-tris-dodecyloxy benzoic acid methyl ester (E12), 3,4,5-tris-tetradecyloxy-benzoic acid methyl ester (E14) and their mixture (E12/E14) have been studied on HOPG by scanning tunneling microscopy (STM). Dimer-like patterns induced by dipole-dipole interaction are observed in E12 and E14 monolayers. The molecules form close-packed rows and interdigitate with the alkyl chains in adjacent molecules. The structural differences are proposed to be from the different length of substituted alkyl chains. Owing to similar adsorption energy, phase separation is observed in the E12 and E14 mixed adlayer with different domains.
Page 1 /8454
Display every page Item


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