Li X.-M.,Kunming University of Science and Technology |
Liu Q.-H.,Tangshan Normal University
Journal of Crystal Growth | Year: 2016
This paper focusses on the heterogeneous nucleation on the surface with the non-constant curvature. The formation of a spherical nucleus on the ellipsoid of rotation is considered. Following the classical nucleation theory, the work of formation of a critical nucleus on the ellipsoid of rotation has been given, and the effects of geometry sizes and the material properties of the ellipsoid of rotation on the work of formation of a critical nucleus have been obtained. When the geometry size of the substrate is about value of the critical nucleus radius, there may exist twice nucleation on the ellipsoid of rotation for the case of the smaller value of λ and <π/2. As the work of formation of a nucleus has only one extremum (the maximum), the nucleation on the oblate rotational ellipsoid is more easy than on the spherical surface, while nucleation on the prolate ellipsoid of rotation is more difficult than on the spherical surface. Furthermore, if the particles of the ellipsoid are added into the parent phase as nucleation agents or catalysts, for some geometry sizes, they would not have the effects on the heterogeneous nucleation. © 2016 Elsevier B.V.
Wang H.,University of Jinan |
Yang L.,University of Jinan |
Wu K.,Yunnan Agricultural Academy |
Li G.,Tangshan Normal University
Microbial Cell Factories | Year: 2014
Background: Transcriptional engineering has presented a strong ability of phenotypic improvement in microorganisms. However, it could not be directly applied to Actinoplanes teichomyceticus L-27 because of the paucity of endogenous transcription factors in the strain. In this study, exogenous transcription factors were rationally selected and transcriptional engineering was carried out to increase the productivity of teicoplanin in L-27. Results: It was illuminated that the σHrdB molecules shared strong similarity of amino acid sequences among some genera of actinomycetes. Combining this advantage with the ability of transcriptional engineering, exogenous sigma factor σHrdB molecules were rationally selected and engineered to improve L-27. hrdB genes from Actinoplanes missouriensis 431, Micromonospora aurantiaca ATCC 27029 and Salinispora arenicola CNS-205 were selected based on molecular evolutionary analysis. Random mutagenesis, DNA shuffling and point mutation were subsequently performed to generate diversified mutants. A recombinant was identified through screening program, yielding 5.3 mg/ml of teicoplanin, over 2-fold compared to that of L-27. More significantly, the engineered strain presented a good performance in 500-l pilot scale fermentation, which meant its valuable potential application in industry. Conclusions: Through rational selection and engineering of exogenous transcriptional factor, we have extended the application of transcriptional engineering. To our knowledge, it is the first time to focus on the related issue. In addition, possessing the advantage of efficient metabolic perturbation in transcription level, this strategy could be useful in analyzing metabolic and physiological mechanisms of strains, especially those with the only information on taxonomy. © 2014 Wang et al.; licensee BioMed Central Ltd.
Yang H.-J.,Beijing Institute of Technology |
Yang H.-J.,Tangshan Normal University |
Cao W.-Q.,Minzu University of China |
Zhang D.-Q.,Beijing Institute of Technology |
And 5 more authors.
ACS Applied Materials and Interfaces | Year: 2015
We fabricated NiO nanorings on SiC, a novel hierarchical architecture, by a facile two-step method. The dielectric properties depend on temperature and frequency in the range from 373 to 773 K and X band. The imaginary part and loss tangent increase more than four times and three times with increasing temperature, respectively. The architecture demonstrates multirelaxation and possesses high-efficient absorption. The reflection loss exceeds-40 dB and the bandwidth covers 85% of X band (approximately-20 dB). The synergistic effect between multirelaxation and conductance is beneficial to the microwave absorption. Our findings provide a novel and feasible strategy to tune microwave absorption. © 2015 American Chemical Society.
Li B.,Tangshan Normal University |
Wang D.,Tangshan Normal University
Journal of Convergence Information Technology | Year: 2012
In this paper, a solution for a multi-objective linear programming problem with fuzzy constraints is presented. Firstly, a general model of the multi-objective linear programming with fuzzy constraints is introduced and a popular solution method is given, in which the model is transformed into a single objective problem with fuzzy constraints by adding weights. Then a new solution method is proposed in which the model can be transformed into a single objective problem with fuzzy constraints by fuzzificating the objective functions. At last, in order to verify the feasibility and effectiveness of this new approach, these two solution methods are respectively applied in the same example.
Ding W.,Tangshan Normal University
International Journal of Simulation: Systems, Science and Technology | Year: 2015
In this paper, the author studies on the design and implementation of dam safety monitoring routing algorithm based on wireless data transmission technology. A mixed repository which based on rule and ANN was studied. The method of reasoning, controlling and repository mange was discussed. Some advice for improving the ES reliability was advanced.10. As an example, the dam monitoring system was particularly discussed. A practical online/offline system for judging dam safety was researched and introduced. © 2015, UK Simulation Society. All rights reserved.
Zhu Y.,Tangshan Normal University
Communications in Computer and Information Science | Year: 2012
Support Vector Machine classification was studied by this article. Kernel function was used on Electrocardiogram (ECG) classification. Classification results show that the support vector machine classification algorithm reduce the complexity of the classification algorithm, and to ensure that the ECG classification accuracy, while the feasibility and effectiveness of the classification of ideas in the ECG classification. © 2012 Springer-Verlag.
Hou Y.,Tangshan Normal University
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2016
The small angle lighting is always a thorny problem in the LED lighting field. The LED lenses and reflectors were important optical devices, which was the key to solve the above problem. So the design of lens and reflectors has been a hot research topic recently. The theory of geometrical optics was used to calculate the coordinates on the lens surface in this paper. Then, the lens model can be constructed based on the coordinates. In order to facilitate understanding, the 30° and 45° lighting lens were taken as examples to introduce the design process. The research findings show that these lenses can concentrate light rays within the predetermined small angles. Furthermore, the efficiency and uniformity are more than 80% and 85% respectively, which can meet the needs of the modern lighting. © 2016, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.
Fan H.,Tangshan Normal University
Applied Mechanics and Materials | Year: 2011
The particle system has unique advantages on the stimulation of the natural phenomena of rain, snow, flowing water and dust, physical phenomena and space warp. The paper discussed using the event-driven particle flow system to stimulate the fountain on the stimulation of fountain on particle system, in which there are disadvantages of by using the non-event-driven particle flow system and lacking of the effects of external factors such as resistance, gravity and the speed of wind. The event-driven particle flow system is made up of a series of events. Every particle flow emitted the particles that will experienced a series of events. In every event we can use operator to the effect of all the changes in particles. Among the tests in the events, the events are connected together. So we can stimulate the water jetting, falling, spray, ripple and the effect of disappear with the wind of the fountain. All these can prove that the event-driven particle system is necessary in producing the realistic scene. © (2011) Trans Tech Publications.
Zhu Y.-W.,Tangshan Normal University
BioTechnology: An Indian Journal | Year: 2014
Fault diagnosis is an important research subject in modern production. The production process of abnormal will bring great losses to enterprises. Therefore it is important to adopt effective fault diagnosis of the production process. SVM will be use to industrial process fault diagnosis. The advantages of the two methods will be fully reflected. The example proves the feasibility and efficiency of this method. © Trade Science Inc.
Meng X.-J.,Tangshan Normal University
Jiegou Huaxue | Year: 2014
In this paper, proton transfer mechanism of alanine induced by Zn2+ was investigated by the CCSD/6-31++G*//B3LYP/6-31++G* method. Six neutral complexes and one amphoteric complex were optimized, among which the amphoteric complex was the most stable with binding energy of 201.92 kcal·mol-1. In addition, the rotation of intramolecular single bond leads to the neutral configuration conversion, in which the rotation energy barriers of C-C single bonds are lower than 10.51 kcal·mol-1, and those of C-O single bonds range among 9.53~17.50 kcal·mol-1. On the other hand, the proton transfers among the carboxylic oxygen atoms can also result in the neutral configuration conversion, whose energy barriers of forward/back reaction are 53.90 and 32.46 kcal·mol-1, respectively. In detail, the proton transfers from carboxylic group to amino lead to their configuration conversion from neutral to amphoteric. Furthermore, under the catalysis of Zn2+, there was no energy barrier in this reaction. The conversion route from the most stable neutral configuration II to the most stable amphoteric configuration I was: II→II-III→III-VI→V-→I-V→I, with the energy barrier to be 64.64 kcal·mol-1.