Room temperature synthesis of Cu nanocages through Ni-induced electroless process
作者：
Zhao, Yan;Zhao, Jingzhe* ;Su, Zhaohong;Ma, Dechong;Hao, Xinli;...
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects ,2013年431:60-65 ISSN：0927-7757
通讯作者：
Zhao, Jingzhe
作者机构：
[Zhao, Jingzhe; Lu, Yan; Zhao, Yan; Guo, Jingnan; Hao, Xinli] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Su, Zhaohong] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Ma, Dechong] Shanxi Transportat Res Inst, Taiyuan 030006, Peoples R China.
通讯机构：
[Zhao, Jingzhe] H;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Ni-induced mechanism;Non-enzymatic sensor;Octahedral Cu nanocages
摘要：
Designed octahedral Cu nanocages were successfully prepared at room temperature by introducing Ni induced electroless strategy. This strategy balanced the inhibitory effect of sodium oleate (SOA) in the room temperature reduction process. Reduction rate was markedly improved as Ni2+ increasing. The Ni-induced electroless Cu deposition mechanism was studied. The first deposited metallic Ni particles catalyzed the oxidation of hydrazine (N2H4·H2O) to give electrons. Cu2O intermediates captured the electrons and were reduced to Cu nanocages with SOA existence. Thermo-gravimetric and differential thermal analysis (TG-DTA) results illuminated that the Ni-induced Cu nanocages had higher oxidation resistance property in air atmosphere compared to Cu nanocages prepared without Ni inclusion. A well-defined, stable and fast amperometric response of glucose was observed when the Ni-induced Cu nanocages were constructed as non-enzymatic glucose sensor. © 2013 Elsevier B.V.
语种：
英文
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Epoxidation of cyclohexene with O-2 over the composite catalysts of Mn-montmorillonite coordinated with novel Schiff-base ligands
作者：
Peng, Yu;Li, Zhongying;Tang, Ruiren*
期刊：
RSC Advances ,2013年3(43):19965-19970 ISSN：2046-2069
通讯作者：
Tang, Ruiren
作者机构：
[Peng, Yu] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Li, Zhongying; Tang, Ruiren] Cent S Univ, Sch Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Tang, Ruiren] C;Cent S Univ, Sch Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.
摘要：
The catalytic activity of the heterogeneous catalysts of Mn-mont (where mont represents montmorillonite) coordinated with Schiff-base ligands for epoxidation of cyclohexene by O<inf>2</inf> under Mukaiyama conditions was studied. The catalysts were characterized by IR, UV-vis DRS, XRD, SEM and ICP. The heterogeneous catalysts were proved to promote the epoxidation of cyclohexene efficiently, the effects of various reaction conditions on the catalytic reaction were optimized and obtained as high as 100% conversion with 90.0% selectivity of epoxycyclohexane at 40 °C in 5 h with molecular oxygen as oxidant in acetonitrile. Repeated runs indicated that the catalysts were stable for at least 3 cycles. Thus, the heterogeneous catalysts of Mn-mont coordinated with Schiff-base ligands were proved to be environmentally friendly and economical for the epoxidation of cyclohexene. ©The Royal Society of Chemistry 2013.
语种：
英文
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Amperometric determination of ascorbic acid using multiwalled carbon nanotube-thiolated polyaniline composite modified glassy carbon electrode
作者：
Liu, Ying;Su, Zhaohong;Zhang, Yi;Chen, Li;Gu, Tiean;...
期刊：
Journal of Electroanalytical Chemistry ,2013年709:19-25 ISSN：1572-6657
通讯作者：
Xie, Qingji
作者机构：
[Huang, Siyu; Liu, Yan; Liu, Ying; Xie, Qingji; Gu, Tiean; Zhang, Yi; Sun, Lingen; Chen, Li; Yao, Shouzhuo] Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410087, Hunan, Peoples R China.;[Su, Zhaohong] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Xie, Qingji] H;Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410087, Hunan, Peoples R China.
关键词：
Amperometric sensing of ascorbic acid;Electroactive nanocomposite of thiolated polyaniline at neutral pH;Mercaptosuccinic acid;Multiwalled carbon nanotubes;Polyaniline
摘要：
A new nanocomposite film that is highly electroactive in neutral aqueous solutions was prepared based on multiwalled carbon nanotubes (MWCNTs), polyaniline (PANI) and mercaptosuccinic acid (MSA). Briefly, a glassy carbon electrode (GCE) was firstly cast-coated with MWCNTs (MWCNTs/GCE), PANI was then electrodeposited on MWCNTs/GCE, and finally MSA was tethered to the electrooxidized PANI via the thiol-ene reaction to form MSA-PANI/MWCNTs/GCE. Electrochemical quartz crystal microbalance, scanning electron microscopy, Fourier transform infrared spectroscopy and electrochemical impedance spectroscopy were used for film characterization and process monitoring. The high electroactivity of MSA-PANI/MWCNTs/GCE observed in neutral aqueous solutions is ascribed to the anionic MSA tethered to the PANI backbones as well as the good conductivity and high specific surface area of MWCNTs. The prepared MSA-PANI/MWCNTs/GCE electrode was successfully used for catalytic electroanalysis of ascorbic acid (AA) at neutral pH. Under optimum conditions, the anodic amperometric detection of AA provides a wide linear detection range (20 μM-29.6 mM), a high sensitivity (363 μA mM<sup>-1</sup> cm <sup>-2</sup>) and a low limit of detection (0.6 μM, S/N = 3) as well as good reproducibility and stability, which are superior to many reported AA electrochemical sensors. ©2013 Elsevier B.V. All rights reserved.
语种：
英文
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Effect of surfactants on fabricating CuO nanoleaves and Cu nanocages at room temperature
作者：
Zhao, Yan;Zhao, Jingzhe* ;Su, Zhaohong;Hao, Xinli;Ma, Dechong;...
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects ,2013年436:34-40 ISSN：0927-7757
通讯作者：
Zhao, Jingzhe
作者机构：
[Zhao, Jingzhe; Lu, Yan; Zhao, Yan; Guo, Jingnan; Hao, Xinli] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Su, Zhaohong] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Ma, Dechong] Shanxi Transportat Res Inst, Taiyuan 030006, Peoples R China.
通讯机构：
[Zhao, Jingzhe] H;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Cu nanocages;CuO nanoleaves;Non-enzymatic sensor;Surfactant
摘要：
Typical surfactants, cetyltrimethylammonium bromide (CTAB), poly(vinyl pyrrolidone) (PVP) and sodium oleate (SOA), were employed to investigate their effect on fabricating CuO nanoleaves and Cu nanocages at room temperature. Comparing with the system without surfactant, adding surfactant could improve the monodispersity of CuO nanoleaves. The obtained CuO nanoleaves were further reduced to Cu nanocages. CTAB performed few effects on the reduction process. PVP accelerated the reducing velocity, while SOA had inhibitory effect on the reaction. The reaction activities of the obtained Cu nanocages with and without surfactants were characterized by thermo-gravimetric and differential thermal analysis (TG-DTA), and the sequence of activity with oxygen is PVP-assisted Cu. >. SOA-assisted Cu. >. CTAB-assisted Cu. >. Cu without surfactant. The obtained Cu nanocages were also used to construct non-enzymatic glucose sensors. The electrodes modified by PVP- and SOA-assisted Cu had relative higher sensitivity than the others. © 2013 Elsevier B.V.
语种：
英文
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Chinese word segmentation for agriculture
作者：
Kui Fang;Weiqiong Bu;Wu Lou;Lu-Ming Shen
期刊：
Journal of Software ,2013年8(5):1219-1226 ISSN：1796-217X
通讯作者：
Bu, W.(buwq_molica@163.com)
作者机构：
[Kui Fang; Weiqiong Bu] Institute of Information Science and Technology, Hunan Agricultural University, Changsha, China;[Lu-Ming Shen] Science College, Hunan Agricultural University, Changsha, China;[Wu Lou] Chinasoft International Co., Ltd, Changsha, China
关键词：
rural informatization;agricultural knowledge base;Chinese word segmentation;Hash function;word segmentation dictionary
摘要：
Based on the Hash mechanism, a new algorithm is presented, the algorithm can realize search, update, deletion and addition operations for dictionary. According to the characteristics of Chinese characters GB code, by preserving the GB code of first word in entry, this method effectively improves the utilization rate of the storage space. In the dictionary, the one-to-many corresponding relationships between dialects and agricultural keywords are built, the dialect words can be translated efficiently into the agricultural key words, so as the word segment accuracy is improved. In the time complexity, Chinese word segmentation algorithm for agriculture were compared with the algorithms for array, linked list and AVL tree. ©2013 ACADEMY PUBLISHER.
语种：
英文
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Additive-free solvothermal synthesis of hierarchical flower-like LiFePO4/C mesocrystal and its electrochemical performance
作者：
Zhou, Nan;Uchaker, Evan;Wang, Hai-Yan;Zhang, Ming;Liu, Su-Qin;...
期刊：
RSC Advances ,2013年3(42):19366-19374 ISSN：2046-2069
通讯作者：
Li, Huiyong
作者机构：
[Wu, Xiongwei; Zhou, Nan; Li, Huiyong] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Cao, Guozhong; Uchaker, Evan; Zhou, Nan; Zhang, Ming] Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA.;[Wang, Hai-Yan; Liu, Su-Qin; Liu, You-Nian; Zhou, Nan] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Li, Huiyong] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
摘要：
Three dimensional hierarchical flower-like lithium iron phosphate (LiFePO<inf>4</inf>) mesocrystals were successfully synthesized via a solvothermal approach with the utilization of a mixture of water/ethylene glycol/dimethylacetamide (H<inf>2</inf>O/EG/DMAC) as co-solvent. No other surfactant or template agent was used and beautiful micro-sized LiFePO <inf>4</inf> mesoporous structures with a special rose-like morphology were obtained. The hierarchical LiFePO<inf>4</inf> mesocrystals were assembled by well crystallized nano-sized LiFePO<inf>4</inf> thin plates with a thickness around 100 nm. The characteristics and electrochemical dynamics as well as performance of the obtained hierarchical flower-like LiFePO<inf>4</inf> mesocrystals were carefully investigated. The flower-like hierarchical LiFePO<inf>4</inf> mesocrystals showed a high initial lithium intercalation capability of 147 mA h g<sup>-1</sup> at a current density of 17 mA g <sup>-1</sup> (0.1 C), which should be attributed to the high specific surface area resulting from the mesoporous superstructure and well crystallized LiFePO<inf>4</inf> nano-plate composition units. Polyvinylpyrrolidone (PVP) was introduced during the solvothermal synthesis as an in situ carbon coating source. The obtained flower-like C-coated LiFePO<inf>4</inf> mesocrystals exhibited even better initial lithium intercalation capability of 161 mA h g<sup>-1</sup> at 0.1 C and showed improved lithium storage performance at high rates as well as good cyclic stability. ©2013 The Royal Society of Chemistry.
语种：
英文
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SiO2 capsulized Cu active nanoparticles: Synthesis and activity study
作者：
Zhao, Yan;Zhao, Jingzhe* ;Su, Zhaohong;Hao, Xinli;Li, Yawen;...
期刊：
Journal of Materials Chemistry A ,2013年1(27):8029-8036 ISSN：2050-7488
通讯作者：
Zhao, Jingzhe
作者机构：
[Zhao, Jingzhe; Li, Na; Li, Yawen; Zhao, Yan; Hao, Xinli] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Su, Zhaohong] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Li, Yunling] Henan Inst Sci & Technol, Coll Chem & Chem Engn, Xinxiang 453003, Peoples R China.
通讯机构：
[Zhao, Jingzhe] H;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.
摘要：
Cu active nanoparticles (Cu ANPs) were synthesized in weakly acidic solution to preserve their catalytic activity. SiO<inf>2</inf> capsules were designed to insulate Cu ANPs from oxidation. The weak interaction between SiO<inf>2</inf> capsules and Cu ANPs ensured that the designed nanoparticles had good anti-oxidation property and potentially high activity. The increased anti-oxidation property with thicker SiO<inf>2</inf> capsules (Cu<inf>s3</inf> >Cu<inf>s2</inf> >Cu<inf>s1</inf>) and the order of reactivity to oxygen (Cu<inf>s1</inf> = Cu<inf>s2</inf> >Cu<inf>s3</inf>) showed that Cu ANPs with SiO<inf>2</inf> capsules (Cu<inf>s2</inf>) of appropriate thickness would be the best for application. By using the samples to construct non-enzymatic sensors, the detected activity toward electro-catalytic oxidation of glucose confirmed this conclusion. Dehiscence of SiO<inf>2</inf> capsules recovered the activity of the Cu ANPs in the catalytic ammonium perchlorate (AP) decomposition process. With the addition of 1.5% of Cu ANPs, the high temperature decomposition of AP decreased by 184.2°C. ©2013 The Royal Society of Chemistry.
语种：
英文
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A dynamical atomic simulation for the NiAl Wulff nanoparticle
作者：
Tang, Jianfeng;Yang, Jianyu*
期刊：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY ,2013年536:318-322 ISSN：1386-1425
通讯作者：
Yang, Jianyu
作者机构：
[Tang, Jianfeng] Hunan Agr Univ, Dept Appl Phys, Changsha 410128, Hunan, Peoples R China.;[Yang, Jianyu] Hunan Inst Engn, Xiangtan 411104, Peoples R China.
通讯机构：
[Yang, Jianyu] H;Hunan Inst Engn, Xiangtan 411104, Peoples R China.
关键词：
Crystal growth;Diffusion in nanoscale solids;Metals and alloys;Structure of nanoparticles
摘要：
Ni - Al bimetallic nanoparticle structures are studied from a kinetic point of view. The diffusion and growth of Ni (or Al) atoms on Al (or Ni) cores with the Wulff structure are simulated by molecular dynamics and nudged elastic band methods. An analytic embedded atom model is applied to the two metals. The energy barriers of several typical diffusion processes of the adatoms on the nanoparticle surface are calculated. Results show that the incorporation of the Ni atoms into the Al core easily occurs, and the reverse process does not readily proceed. The growth simulations reveal that a better core-shell nanoparticle is obtained when the Al atoms are deposited on the Ni core at lower temperatures, and the deposition of the Ni atoms on the Al core leads to an amorphous surface. (C) 2013 Elsevier B.V. All rights reserved.
语种：
英文
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基于多重分形理论的油菜缺素叶片特征提取
作者：
王访;廖桂平;王晓乔;李建辉;李锦卫;...
期刊：
农业工程学报 ,2013年29(24):181-189 ISSN：1002-6819
通讯作者：
Liao, G.(lgpxf@hunau.net)
作者机构：
[王访; 施文] Science College, Hunan Agricultural University, Changsha 410128, China;[李建辉; 王访; 廖桂平; 王晓乔; 李锦卫] Agricultural Information Institute, Hunan Agricultural University, Changsha 410128, China
通讯机构：
Agricultural Information Institute, Hunan Agricultural University, China
关键词：
图像处理;图像分割;分形;特征提取;模糊C均值聚类;油菜缺素;局部多重分形去趋势波动分析
摘要：
为描述油菜缺素叶片图像的特征,该文提出了一种基于多重分形去趋势波动分析方法,即局部多重分形去趋势波动分析。该方法确定的h_(ij)(q)指数能有效刻画叶片图像每个像素点的多重分形特征,并以所有像素点h_(ij)(q)的平均值Lh_q表征每幅图像的多重分形特征。选取4种油菜缺素叶片图像进行试验,结果表明所提取局部多重分形去趋势波动平均指数Lh_q能很好地区分叶片,并通过方差分析指出当q={-10, -9, -8, -7, -6}时的Lh_q区分效果最好。最后基于每个像素点的h_(ij)(q)指数利用模糊C均值聚类对缺镁油菜叶片图像进行模糊分割,并与传统的灰度值分割及经典的基于容量测度的指数分割进行了对比试验,结果表明以上述h_(ij)(q)为特征具有最佳的分割效果。
语种：
中文
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Leaf image segmentation method based on multifractal detrended fluctuation analysis
作者：
Wang, Fang;Li, Jin-Wei* ;Shi, Wen;Liao, Gui-Ping
期刊：
Journal of Applied Physics ,2013年114(21):214905 ISSN：0021-8979
通讯作者：
Li, Jin-Wei
作者机构：
[Shi, Wen; Wang, Fang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Liao, Gui-Ping; Li, Jin-Wei; Wang, Fang] Hunan Agr Univ, Agr Informat Inst, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Li, Jin-Wei] H;Hunan Agr Univ, Agr Informat Inst, Changsha 410128, Hunan, Peoples R China.
关键词：
crops;fuzzy set theory;image segmentation;pattern clustering
摘要：
To identify singular regions of crop leaf affected by diseases, based on multifractal detrended fluctuation analysis (MF-DFA), an image segmentation method is proposed. In the proposed method, first, we defend a new texture descriptor: local generalized Hurst exponent, recorded as LHq based on MF-DFA. And then, box-counting dimension f(LHq) is calculated for sub-images constituted by the LHq of some pixels, which come from a specific region. Consequently, series of f(LHq) of the different regions can be obtained. Finally, the singular regions are segmented according to the corresponding f(LHq). Six kinds of corn diseases leaf's images are tested in our experiments. Both the proposed method and other two segmentation methods—multifractal spectrum based and fuzzy C-means clustering have been compared in the experiments. The comparison results demonstrate that the proposed method can recognize the lesion regions more effectively and provide more robust segmentations.
语种：
英文
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Adsorption of methylene blue onto humic acid-coated Fe3O4 nanoparticles
作者：
Zhang, Xian;Zhang, Panyue* ;Wu, Zhen;Zhang, Ling;Zeng, Guangming;...
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects ,2013年435:85-90 ISSN：0927-7757
通讯作者：
Zhang, Panyue
作者机构：
[Zhang, Xian] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Zeng, Guangming; Zhang, Panyue; Wu, Zhen] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.;[Zhang, Ling] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China.;[Zhou, Chunjiao] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Zhang, Panyue] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Zhang, Panyue] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
会议名称：
7th International Conference on Interfaces Against Pollution (IAP)
会议时间：
JUN 11-14, 2012
会议地点：
Nancy, FRANCE
会议主办单位：
[Zhang, Xian] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.^[Zhang, Panyue;Wu, Zhen;Zeng, Guangming] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.^[Zhang, Ling] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China.^[Zhou, Chunjiao] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Humic acid;Fe3O4 nanoparticles;Adsorption;Methylene blue;Desorption
摘要：
Humic acid-coated Fe3O4 (HA-Fe3O4) nanoparticles as magnetic adsorbents were prepared with co-precipitation of humic acids and Fe3O4 nanoparticles. TEM analysis indicated that the average diameter of the spherical HA-Fe3O4 core was about 15nm. TGA characterization showed that the HA-Fe3O4 nanoparticles contained about 50% (w/w) HA. The characteristic absorption of HA at 1604/cm and 1701/cm was observed in the FIRT spectra of HA-Fe3O4 nanoparticles. The HA-Fe3O4 nanoparticles exhibited a typical superparamagnetic characteristic with a saturation magnetization of 77emu/g, which resulted in an easy solid-liquid separation with an external magnet. The HA-Fe3O4 nanoparticles were applied for methylene blue (MB) adsorption and results showed that the HA-Fe3O4 nanoparticles possessed much higher adsorbed amount of MB than the bare Fe3O4 nanoparticles and HA powders. The HA-Fe3O4 nanoparticles remained stable in a broad pH range of 3-11. The adsorption kinetics can be described by a pseudo-second-order equation, and the time when 50% of the MB was adsorbed (t1/2) was 7min. The adsorption isotherm of the HA-Fe3O4 nanoparticles agreed well with Langmuir adsorption equation, and the maximum adsorbed amount of MB was 0.291mmol/g. Desorption of the saturated HA-Fe3O4 nanoparticles was easily carried out with a mixture of methanol and acetic acid with a volume ratio of 9:1. © 2013 Elsevier B.V.
语种：
英文
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Determination of Fatty Acid Methyl Esters in Biodiesel Produced from Pistacia Chinensis Oil by GC
作者：
Liu, Xianghua* ;Xing, Chao;Ruan, Ying;Hu, Qiulong;Shen, Wenhui;...
期刊：
Applied Mechanics and Materials ,2013年291-294:253-256 ISSN：1660-9336
通讯作者：
Liu, Xianghua
作者机构：
[Ruan, Ying; Liu, Chunlin; Liu, Xianghua; Shen, Wenhui; Xing, Chao; Hu, Qiulong] Hunan Agr Univ, Hunan Prov Key Lab Crop Germplasm Innovat & Utilz, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Liu, Xianghua] H;Hunan Agr Univ, Hunan Prov Key Lab Crop Germplasm Innovat & Utilz, Changsha 410128, Hunan, Peoples R China.
会议名称：
International Conference on Sustainable Energy and Environmental Engineering
会议时间：
2012-12-29
会议地点：
Guangzhou(CN)
会议主办单位：
[Liu, Xianghua;Xing, Chao;Ruan, Ying;Hu, Qiulong;Shen, Wenhui;Liu, Chunlin] Hunan Agr Univ, Hunan Prov Key Lab Crop Germplasm Innovat & Utilz, Changsha 410128, Hunan, Peoples R China.
会议论文集名称：
Advances in energy science and technology
关键词：
Gas chromatography;FAMEs;Biodiesel;Pistacia chinensis oil
摘要：
An accurate determination method of fatty acid methyl esters (FAMEs) in biodiesel produced from pistacia chinensis oil by gas chromatography (GC) was developed, with methyl tridecanoate used as an internal standard. The results show that the standard calibration curves for the FAMEs have good linearity over the concentration range, the linearity correlation coefficients (R<sup>2</sup>) are more than 0.99 for all the components. The average recoveries are from 95.26% to 99.66%. The method has good precision with the RSD ranging from 1.03% to 3.40%. ©(2013) Trans Tech Publications, Switzerland.
语种：
英文
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The configurations of nanoalloy by impact deposition: Atomistic simulation on Ni-Al system
作者：
Tang, Jianfeng;Yang, Jianyu*
期刊：
Journal of Nanoparticle Research ,2013年15(11):1-9 ISSN：1388-0764
通讯作者：
Yang, Jianyu
作者机构：
[Tang, Jianfeng] Hunan Agr Univ, Dept Appl Phys, Changsha 410028, Hunan, Peoples R China.;[Yang, Jianyu] Hunan Inst Engn, Xiangtan 411104, Peoples R China.
通讯机构：
[Yang, Jianyu] H;Hunan Inst Engn, Xiangtan 411104, Peoples R China.
关键词：
Structure of nanocrystals and nanoparticles;Vacuum deposition;Impact phenomena;Molecular dynamics;Nanoparticle growth mechanism;Modeling and simulation
摘要：
The use of energetic particles can change the growth mode and provide control of nanoalloy morphology and properties. The impact deposition of Ni (or Al) on the truncated octahedral nanoparticle of Al (or Ni) is studied. The embedded atom method is used for the description of the interatomic interactions in combination with molecular dynamics method for the growth simulation. Three configurations of Ni–Al nanoparticle are obtained depending on incident energy and deposition sequence. A perfect core–shell nanoparticle with Ni-core/Al-shell is obtained as Al atoms are deposited over Ni nanoparticle. For the deposition of Ni atoms on Al nanoparticle, an onion-like nanoparticle at smaller incident energy, and a configuration with Al-shell and alloyed Ni–Al core at larger incident energy are observed, respectively. The formation energies show that the latter is energetically favorable.
语种：
英文
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Enhancing the stability of immobilized catalase on activated carbon with gelatin encapsulation
作者：
Wang, Yulin;Guan, Yuepeng;Yang, Yin;Yu, Peng* ;Huang, Yaqin
期刊：
Journal of Applied Polymer Science ,2013年130(3):1498-1502 ISSN：0021-8995
通讯作者：
Yu, Peng
作者机构：
[Yang, Yin; Wang, Yulin; Huang, Yaqin] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Key Lab Carbon Fiber & Funct Polymers, Minist Educ, Beijing 100029, Peoples R China.;[Yu, Peng; Guan, Yuepeng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Yu, Peng] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
adsorption;biomaterials;catalysts;proteins
摘要：
Gelatin (Gel) encapsulation onto activated carbon (AC) with catalase (CAT) was developed as an alternative method for CAT immobilization in this study. The immobilized CAT with AC encapsulated by Gel as the supporter accounted for 65.69% of the native enzyme activity. Furthermore, the properties of the immobilized CATs were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Among free CAT and the two immobilized CATs, the immobilized CAT with AC encapsulated by Gel as the supporter showed the highest relative enzymatic activity and a high stability in a broad range of pH values and temperatures, and its residual activity was 80% after 15 uses, whereas the immobilized CAT with AC as the supporter was retained at a level of only 50% under the same conditions. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1498–1502, 2013
语种：
英文
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The formation of FecoreAlshell and FeshellAlcore nanoparticles, a molecular dynamics simulation
作者：
Yang, Jianyu* ;Hu, Wangyu;Tang, Jianfeng;Dai, Xiongying
期刊：
计算材料学(英文) ,2013年74:160-164 ISSN：2057-3960
通讯作者：
Yang, Jianyu
作者机构：
[Yang, Jianyu] Hunan Inst Engn, Xiangtan 411102, Peoples R China.;[Dai, Xiongying; Hu, Wangyu] Hunan Univ, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.;[Tang, Jianfeng] Hunan Agr Univ, Dept Appl Phys, Changsha 410028, Hunan, Peoples R China.
通讯机构：
[Yang, Jianyu] H;Hunan Inst Engn, Xiangtan 411102, Peoples R China.
关键词：
Diffusion of adsorbates;Metals and alloys;Nanocrystals and nanoparticles;Nucleation and growth
摘要：
According to the surface segregation theory, bimetallic nanoparticles can easily form core-shell configuration. An atom with low surface energy and large atomic size distributes on the surface of the nanoparticle, and another atom occupies the internal position. In the present work, the diffusion and growth configuration of Fe-Al nanoparticles are examined. The calculated energy barriers for the interfacet diffusion via the hopping or the exchange mechanisms are larger than that for the intrafacet diffusion. The result suggests that both FecoreAlshell and FeshellAlcore nanoparticles can be obtained at proper temperatures. The growths of the Fe and Al adatoms on the icosahedron of Al and the rhombohedron of Fe are simulated by molecular dynamics along with embedded atom methods in the temperature range of 100-300 K. FeshellAlcore, a reversed core-shell configuration, is obtained at low temperatures. © 2013 Elsevier B.V.
语种：
英文
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Photoluminescence properties of AlN-doped BaMgAl10O17:Eu2+ phosphors
作者：
Wang, Yong;Tang, Jianfeng;Ouyang, Xicheng;Liu, Buqiong* ;Lin, Rong Han
期刊：
Materials Research Bulletin ,2013年48(6):2123-2127 ISSN：0025-5408
通讯作者：
Liu, Buqiong
作者机构：
[Ouyang, Xicheng; Tang, Jianfeng; Wang, Yong] Hunan Agr Univ, Dept Appl Phys, Changsha 410128, Hunan, Peoples R China.;[Liu, Buqiong] Hunan Agr Univ, Dept Grad Studies, Changsha 410128, Hunan, Peoples R China.;[Lin, Rong Han] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA.
通讯机构：
[Liu, Buqiong] H;Hunan Agr Univ, Dept Grad Studies, Changsha 410128, Hunan, Peoples R China.
关键词：
A. Optical materials;D. Luminescence;D. Optical properties
摘要：
The AlN-doped BaMgAl10O17:Eu2+ phosphors were synthesized by conventional solid-state reaction. Powder X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence spectrum (PL) were used for characterization. The growth mechanism was carried out by computer simulation with CASTEP application, and revealed that an ideal hexagonal shape, particle size in 5 μm and 2.5–3 μm in thickness, could be obtained by AlN doping. Additionally, due to the low electronegativity of N3−, the AlN-doped sample showed 35% increase in PL intensity and improvement of thermal stability. These fine particle size and better photoluminescence properties are expected to be applicable to industrial production of BaMgAl10O17:Eu2+ phosphors.
语种：
英文
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椪柑果实病虫害的傅里叶频谱重分形图像识别
作者：
温芝元;曹乐平
期刊：
农业工程学报 ,2013年29(23):159-165 ISSN：1002-6819
通讯作者：
Cao, L.(clp4218@126.com)
作者机构：
[温芝元] College of Science, Hunan Agricultural University, Changsha 410128, China;[曹乐平] Hunan Biological and Electromechanical Polytechnic, Changsha 410127, China
通讯机构：
Hunan Biological and Electromechanical Polytechnic, China
关键词：
图像识别;病害;果实;虫害;二维离散傅里叶变换;幅度谱;多重分形
摘要：
为探讨植物病虫害互不交叉、重叠的数字典型特征值来进行病虫害计算机识别,研究了椪柑病虫害为害状图像傅里叶变换幅度谱的多重分形特征。首先,用改进型分水岭算法检测病虫害为害状边缘,并对其进行区域合并,形成病虫害为害状边界。其次,对病虫害果进行二维离散傅里叶变换,依据病虫害为害状边界进行图像标记,提取标记区域内的傅里叶变换幅度谱图。最后,对傅里叶变换幅度谱图进行多重分形分析及多重分形谱的二次拟合,将拟合抛物线段的高度、宽度和质心坐标作为病虫害特征值,并以此为输入变量,建立 BP 神经网络椪柑病虫害识别模型来进行病虫害识别,椪柑蓟马、花潜金龟子、吸果夜蛾、侧多食跗线螨、椪柑炭疽病5类病虫害30组测试样本中吸果夜蛾识别正确率最高96.67%,侧多食跗线螨识别正确率最低86.67%,平均正确识别率为92.67%。试验结果表明:傅里叶变换幅度谱图的多重分形谱高度、宽度和质心坐标较精确地刻画了病虫害为害状这类复杂生物体的特征,该方法可进行椪柑病虫害自动识别,并可推广到其他植物的病虫害机器识别中。
语种：
中文
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Elimination of the Schottky Barrier at an Au-ZnSe Nanowire Nanocontact via in Situ Joule Heating
作者：
Tan Yu;Wang Yan-Guo*
期刊：
中国物理快报：英文版 ,2013年30(1): 017902-1-017902-4 ISSN：0256-307X
通讯作者：
Wang Yan-Guo
作者机构：
[Tan Yu] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Wang Yan-Guo] Chinese Acad Sci, Inst Phys, Beijing Lab Condensed Matter Phys, Beijing 100190, Peoples R China.;[Wang Yan-Guo] Chinese Acad Sci, Inst Phys, Beijing Lab Condensed Matter Phys, POB 603, Beijing 100190, Peoples R China.
通讯机构：
[Wang Yan-Guo] C;Chinese Acad Sci, Inst Phys, Beijing Lab Condensed Matter Phys, POB 603, Beijing 100190, Peoples R China.
摘要：
In order to improve electron transport, in situ Joule heating of an Au-ZnSe nanowire-Au (M-S-M) nanostructure is conducted inside transmission electron microscopy (TEM) until the Au metal is molten at the reversely biased Au-ZnSe nanowire (M-S) nanocontact. The observed microstructural evolution is responsible for the electron transport property changes, i.e. a nonlinear to linear transformation in the current-voltage (I - V) relationship was measured in situ before and after the Joule annealing. The linear characteristic in the I - V relationship confirms elimination of the Schottky barrier at the M-S nanocontact and formation of ohmic contacts. Consequently, electron transport at the M-S nanocontact can be significantly improved by the removal of the Schottky barrier via in situ Joule heating. © 2013 Chinese Physical Society and IOP Publishing Ltd.
语种：
英文
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A new extrapolation cascadic multi-grid method for semi-linear PDEs
作者：
Liu, Yuewu
期刊：
Journal of Computational Information Systems ,2013年9(11):4291-4297 ISSN：1553-9105
通讯作者：
Liu, Y.(yuewu_liu5@yahoo.com.cn)
作者机构：
[Liu, Yuewu] Department of Science, Hunan Agricultural University, Changsha 410128, China
通讯机构：
Department of Science, Hunan Agricultural University, China
关键词：
Extrapolation;Multigrid method;Semilinear PDEs;Superconvergence
摘要：
Based on the asymptotic expansion of the error and super-convergence estimates, some new extrapolation formulas are established. Then a new cascadic multi-grid method for semi-linear PDEs is proposed. Numerical experiments show the efficiency of our approach. ©2013 by Binary Information Press.
语种：
英文
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Facile solvothermal synthesis of Cu2SnS3 architectures and their visible-light-driven photocatalytic properties
作者：
Tan, Yu* ;Lin, Zhiqun;Ren, Wenhui;Long, Woyun;Wang, Yong;...
期刊：
Materials Letters ,2012年89:240-242 ISSN：0167-577X
通讯作者：
Tan, Yu
作者机构：
[Lin, Zhiqun; Ouyang, Xicheng; Long, Woyun; Tan, Yu; Ren, Wenhui; Wang, Yong] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Tan, Yu] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
semiconductors;Cu_2SnS_3;microstructure;photocatalytic activity
摘要：
In this paper, three dimensional (3D) Cu2SnS3 architectures were successfully synthesized via a simple solvothermal route. The structure, morphology and optical properties of the as-prepared samples were characterized by using an X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV–vis diffuse reflectance spectra (UV–vis DRS). The SEM and TEM image indicated that the flower Cu2SnS3 architectures consist of large number of uniform nanosheets. The band gap is about 2.42 eV, which have been confirmed by UV–vis DRS. Photocatalytic activities by photodegradation reaction of methylene blue (MB) were investigated under visible-light irradiation. The results indicate the potential applications of the Cu2SnS3 architectures in visible-light-driven photocatalysts.
语种：
英文
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