Advanced Materials Research Vol. 485

Abstract: The bearings with variable damping characteristics are very important for floating slab track (FST) to restrain vibration in low frequency. A model with single degree of freedom of FST is built. Based on analyzing the characteristic of the magnetorheological grease (MRG) materials, a MRG isolator is proposed to instead of passive bearings of FST. For attenuating the vertical vibration, the method of adaptive particle swarm optimization (PSO) with variable inertial parameter is proposed to adjust the damping. The results simulated in MATLAB show that MRG isolators with the adaptive PSO algorithm can optimize damping at different excitations effectively and conspicuously decrease the low frequency vibration energy of FST.

Abstract: Field data were sampled by the method of contiguous grid quadrate. The spatial patterns of Pseudolarix amabilis populations were studied by the following methods: DispItalic textersal index (C), David moores index (I), Lloyd index (m*/m), Morisita index (Iδ), Parameter of negative index (K) and Cassie index (1/K). The quadrate variance analysis, Greig-Smith and Kershaw methods were used to study the spatial distribution pattern, pattern scale and pattern intensity of Pinus armandi population at different sizes. The result showed that P. amabilis population is most clumped. The result indicated the pattern intensity was decreasing with the size increasing and a single peak value appeared in the curve with the area increasing. There was a slow change in the pattern intensity of population, which means a smaller variation in environment and a bigger difference in the relative density of population patches during diffusion process.

Abstract: A pot experiment was conducted to determine the effect of nitrogen fertilizer on the uptake of soil native N and fertilizer N by spring wheat using ¹⁵N isotopic dilution method. The results showed that fertilizer N addition restrained the uptake of soil N via a negative added nitrogen interaction (ANI), and the effect being more at higher rates of application. Additionly, fertilizer N increased the uptake of fertilizer N by wheat, in which grain uptook most of the nitrogen, followed by straw and root. The nitrogen use efficiency (NUE) ranged from 27%~51%, while 36%~63% of the fertilizer-N remained in soil ready for successive crop growth.

Abstract: A heterogeneous azeotropic distillation partitioned distillation column (HADPDC) for alcohol dehydration was investigated compared to a conventional heterogeneous azeotropic distillation sequence (CHADS) from environmental performance perspective by using the software Aspen Plus. HADPDC can eliminate the condenser of the second column and decrease the degree of back-mixing. The optimal design of HADPDC guaranteed the minimum energy consumption, which is related to the minimum CO₂ emissions.

Abstract: In the 21st century, with the accelerated development of economic globalization, business competition will inevitably tend to more international and fierce. How to improve its own competitiveness is now becoming a key issue each enterprise has to think about. The emergence of supply chain management theory undoubtedly has become a good medicine. Since the selection of supply chain partners is an essential stage in the decision-making of supply chain management, how to select appropriate supply chain partners has been increasingly important to business.

Abstract: Focusing on the harmonic suppression and reactive power compensation with the medium and small capacity, the paper gives the solution based on the economical three-phase four-switch APF which uses the instruction current detecting algorithm based on the active power conservation to achieve the detection in real time mode. The whole system structure, the hardware implementation and software workflow analysis for the control system are presented. Application in the practical field project proves that the designed product works in high efficiency steadily.

Abstract: BOS-013 actinomycete strain was obtained by separating difference soil of areas from ChangBai Mountain. The antifungal antibiotic produced by Streptomyces Hygroscopicus BOS-013 was firstly purified by means of macro-porous adsorbent resin and thin-layer chromatography. Separation and Purification of the antifungal antibiotic from its fermentation broth of streptomyces hygroscopicus BOS-013 strain were further carried out by Simulated Moving Bed Chromatography and then the crystal of the antibiotic with high purity was got. In this paper, the methods of purification by adsorbing of micro-porous adsorbent resin and detection by high performance liquid chromatography were established. The exact structure of the antibiotic was identified by mass spectrometry and NMR spectra.

Abstract: In this paper, we give a short survey on natural gas load forecasting technology. Because the variation of gas load is influenced by weather and people activity, the traditional forecasting results and the precision is low. The forecasting methods based on statistical learning theory and artificial neural network are discussed in detail. We also give some future research on the forecasting method of gas load.

Abstract: The present study is targeted on the simulated wastewater containing Cu(Ⅱ), citric acid and TiO₂ under UV illumination in the presence of oxygen and at acidic pH. The photocatalytic reaction obeys first-order kinetic equation. The influence of Cu(Ⅱ) on photocatalytic oxidation of citric acid and how citric acid will affect the treatment of Cu(II) were described. The result showed that the coexistence of Cu(Ⅱ) and citric acid was favourable to the photocatalytic oxidation and reduction. Cu(Ⅱ) reductive product was analyzed by using X-ray Photoelectron Spectroscopy.

Abstract: In this paper, the machining properties of Toona sinensis, compared with Castanopsis hystrix, were tested. Their properties were conducted according to the criteria ASTM D1666-87 and the test on crosscutting was referred to the method established by New Zealand Forest Research Institute. The results show that four kinds of machining properties(planning, sanding, shaping and crosscutting) of Toona sinensis show excellent, and the drilling and mortising properties a bit poor, show good; but, the machining properties of Castanopsis hystrix in the planning, sanding, drilling, shaping and crosscutting all show excellent, the mortising properties, a bit poor, show good; in the machining performance comprehensive evaluation system for full marks 50 points, their comprehensive marks are separately 43.9 points and 44.4 points, so that both of them have excellent machining property.