关键词：
Magnetic properties;nanoclusters;antiferromagnetic states;Fe doped
摘要：
Lowest energy structures of ZnnSen (n=2–13) nanoclusters were obtained as the pristine clusters with first principle all-electron calculations. Second-order energy difference of the Lowest energy ZnnSen (n=2–13) nanoclusters indicated that n=12 is the stable size. Then Zn12Se12 cluster were applied to be doped with single and two Fe atoms to investigate the structural and magnetic properties of Fe doped small ZnSe nanoclusters. Configuration of Fe doped Zn12Se12 were applied and total energy indicated that Fe atoms prefer to substitute Zn atoms in Fe-doped Zn12Se12 nanoclusters. And for the two Fe doped Zn12Se12 cluster, Fe atoms favor to locate at adjacent Zn atom sites in antiferromagnetic states because of the Fe–Fe short ranged superexchange mechanism, and energy gap between lowest unoccupied molecular orbital and the highest occupied molecular orbital were presented with Fe-Fe distance for the cluster with further light emitting exploring. REFERENCES Section: ChooseTop of pageREFERENCES << 1. S. Andrew. Crampton, D. Marian. RÖtzer, J. Claron. F. Ridge Florian. Schweinberger, Ueli Heiz, Bokwon Yoon, Uzi Landman, Structure sensitivity in the nonscalable regime explored via catalysed ethylene hydrogenation on supported platinum nanoclusters, Nature Communications. 7 (2016): 10389 https://doi.org/10.1038/ncomms10389, Google ScholarCrossref 2. N. Pradhan and X.-G. Peng, Efficient and Color-Tunable Mn-Doped ZnSe Nanocrystal Emitters: Control of Optical Performance via Greener Synthetic Chemistry, J. Am. Chem. Soc., 129 (2007): 3339–47. https://doi.org/10.1021/ja068360v, Google ScholarCrossref 3. Y. Lin, Z. Jianguo, X. Dingquan. Microemulsion-mediated hydrothermal synthesis of ZnSe and Fe-doped ZnSe quantum dots with different luminescence characteristics. Royal Society of Chemistry RSC Adv. 2 (2012): 8179–8188 https://doi.org/10.1039/c2ra21401f, Google ScholarCrossref 4. S. Jaspal, N.K. Verma. Synthesis and characterization of Fe-doped CdSe nanoparticles as dilute magnetic semiconductor. J Supercond Nov Magn 25 (2012):2425–2430, Google ScholarCrossref 5. M. K. Yadav, B. Sanyal and A. Mookerjee, Structural, Electronic and Magnetic Properties of Cr-Doped (ZnTe)12 Clusters, J. Magn.Magn. Mater. 321 (2009): 235–40. https://doi.org/10.1016/j.jmmm.2008.08.092, Google ScholarCrossref Published by AIP Publishing. false
摘要：
Aiming at the current SLS forming metal parts with poor performance, low accuracy, and cannot be directly used, etc., in this paper, Having studied a formula of SLS forming material with good formability, simple preparation and low cost for laser sintering. Using the orthogonal cut-and-try method to study and optimize the influence of SLS forming craft parameter on the shape semi-finished product intensity and the precision. By analyzing the high temperature sintering process of the degraded billet, the high temperature sintering process of the composite metal powder material was established. Having studied The mechanical strength of metal parts after the post-treatment process such as degreasing and high-temperature sintering, as well as its internal microscopic organization appearance characteristic, obtain the compared effect.
作者机构：
School of Mechanical Engineering,Wuhan Polytechnic University,Wuhan 430000 China
会议名称：
INTERNATIONAL CONFERENCE ON COMPUTATIONAL MODELING, SIMULATION AND OPTMIZATION (CMSO 2019)(2019年计算建模、仿真与优化国际会议)
会议时间：
2019-11-24
会议地点：
北京
会议论文集名称：
INTERNATIONAL CONFERENCE ON COMPUTATIONAL MODELING, SIMULATION AND OPTMIZATION (CMSO 2019)(2019年计算建模、仿真与优化国际会议)论文集
关键词：
Near infrared spectroscopy;Walnut oil;Adulteration;Quantitative prediction
摘要：
Near-infrared spectroscopy（NIR） was employed to determine the quality of walnut oil. Multivariate scattering correction（MSC） and combination of standard normal variate and de-trend（SNV-DT） were separately used for preprocessing. Successive projection algorithm（SPA） and combination of competitive adaptive reweighted sampling algorithm and partial least squares method（CARS-PLS） were separately used for extraction of characteristic wavelengths. Particle swarm optimization（PSO） and genetic algorithm（GA） methods were separately used for parameter optimization. Eventually, quantitative prediction models for impurities contents in walnut oil were established by support vector machine（SVM）. After analysis of the prediction results derived from these models, an optimal candidate was obtained.
关键词：
Wind and rain bridge;wood and stone combination;material
摘要：
The wind and rain bridge is landmark of the Dong people; which is a unique national landscape, and it is the crystallization of art history of bridge construction in China, its rigorous structure, unique shape and abundant national temperament exudes a strong national atmosphere. The wind and rain bridge is a wood and stone bridge building that integrates bridge, corridor and pavilion, it is as strong as iron and stone bridges and can exist for two or three hundred years without damage. The lower part of wind and rain bridge is the pier, it is mostly made up of bluestone; the middle bridge floor and the upper pavilion are mostly wooden structures.
摘要：
Under the background of "Internet +", great efforts have been made to promote the wide application of information technology in translation teaching and the integration of them, thus gradually realizing the revolution of the presentation of teaching contents, the learning ways of students, the teaching methods of teachers and the interaction between students and teachers. Teachers will exert the advantages of information technology to the fullest and supply students with rich educational environment and powerful learning tools for their translation learning and development.
会议名称：
3rd International Conference on Computer Engineering, Information Science & Application Technology（ICCIA 2019）
会议时间：
2019-05-30
会议地点：
中国重庆
会议论文集名称：
Proceedings of the 3rd International Conference on Computer Engineering, Information Science & Application Technology(ICCIA 2019)
关键词：
building;firefighting;information technology;internet of things;QR code;game
摘要：
With the acceleration of urbanization process,the difficulty of building firefighting has greatly increased due to the complex structure and huge space in the building.When the fire occurs,both the fire position and the development trend of the disaster have a strong randomness,it is very important to quickly determine the position of the fire and accurately and effectively evacuate the people in the building.The three-dimensional visual intelligent fire evacuation system is proposed based on BIM technology,which can realize the management of building information and equipment information,in addition to the Internet of things technology,real-time upgrade of information can be achieved,so that the fire environment can be quickly and efficiently understood,which can greatly improve rescue efficiency of firefighting,and VR and virtual game technology are integrated,realtime feedback is conducted when users play games,and system updates.This system provides more information services to users through the storage of building information.
作者机构：
[Gao, Zunhai] Wuhan Polytech Univ, Sch Math & Comp Sci, Wuhan, Hubei, Peoples R China.;[Chen, Zhuo] Wuhan Polytech Univ, Sch Econ & Management, Wuhan, Hubei, Peoples R China.
会议名称：
2019 2nd International Conference on Mechanical Engineering, Industrial Materials and Industrial Electronics (MEIMIE 2019)2019年第二届机械工程、工业材料和工业电子国际会议(Meimie 2019)
会议时间：
2019-03-29
会议地点：
大连
会议主办单位：
[Gao, Zunhai] Wuhan Polytech Univ, Sch Math & Comp Sci, Wuhan, Hubei, Peoples R China.^[Chen, Zhuo] Wuhan Polytech Univ, Sch Econ & Management, Wuhan, Hubei, Peoples R China.
会议论文集名称：
2019 2nd International Conference on Mechanical Engineering, Industrial Materials and Industrial Electronics (MEIMIE 2019)2019年第二届机械工程、工业材料和工业电子国际会议(Meimie 2019)论文集
关键词：
graph;edge-chain matrix;multiplication of edge-chain matrix;Eulerianian path;Eulerianian cycle)
摘要：
The initial edge-chain matrix and general edge-chain matrix of graph are presented. The operations of the general edge-chain matrices are derived, by which a method to find all Eulerian cycles is obtained. Only through some power operations of the initial edge-chain matrix, can reveal all Eulerianian cycles which are showed in the final edge-chain matrix. This method can determine whether Eulerianian cycles exist or not and if they do can also find out all of them. It is effective to directed or undirected finite graph. And it can be simplified by computations of some row vectors and column vectors of some power of the initial edge-matrix. This pure mathematical method shows the results more intuitive and makes program operation easier.
