Advanced Materials Research Vols. 535-537

Abstract: The authors present the results of hetero-epitaxial growth of ultrafine SnO₂ nanowires on ZnS nanobelt substrates by a simple thermal evaporation method. ZnS/SnO₂ hetero-nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDS), transmission electron microscopy (TEM) to obtain the morphology and structural information. Comparing with ZnS nanobelts and SnO₂ nanowires respectively, the optical properties of ZnS/SnO₂ hetero-nanostructures are studied by Raman scattering and photoluminescence (PL) spectroscopy at room temperature.

Abstract: Based on experimental data from the five observation points during the three years, the linear subsected functions and the nonlinear s-shaped functions between the cotton relative yield and soil salt content on the salinized soil about the 0-20cm soil layer and the 0-40cm soil layer in Akesu River Irrigation District were constructed by linear regression and nonlinear least square approximation. Their applicabilities were analyzed and compared and it was found the nonlinear s-shaped function of the 0-20cm soil layer to fit better with the response relationship between the cotton relative yield and the soil salt content on the salinity soil than others in Akesu River Irrigation District.which and the indexes of cotton salt tolerance were definited, and then the indexes of cotton salt tolerance were drawn on with the function with better applicability. From the function, some indexes of salt tolerance，which contained the cotton critical soil salt content, the cotton threshold soil salt content, the soil salt content at the fastest rate of cotton relative yield reduction, and the soil salt content at the 50% cotton relative yield reduction, and so on, were determined, which can be provide as the important references for the agricultural planting, improvement of salinized soil and irrigation with saline water in Akesu River Irrigation District.

Abstract: A new type of electric vehicle battery equalization circuit is described and analyzed in this paper. The circuit uses a two-way flyback converter and relay group to achieve energy transformation between the batteries and realize energy balance of electric vehicle battery pack, which could prevent battery over charging and over discharging. Compared to conventional equalizer, the equalizer is faster and more effective.

Abstract: KMn8O16 nanorods were prepared by a rheological phase method using KMnO4 and Mn (CH3COO)2•4H2O as reactants. The samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that the morphology of the samples was nanorods with a diameter of about 5~15 nm. The electrochemcial testing showed that the KMn8O16 nanorods annealed at 400 °C for 4 h exhibited good lithium storage properties, with a high reversible capability (143 mAh/g at current density of 50 mA/g) and stable lithium-ion insertion/de-insertion reversibility.

Abstract: China has made great improvement in some critical scientific subject, like nanoscience and nanotechnology. This study explores the state-of-the-art developments of China in nanoscience and nanotechnology, as the previous study showed that China has become the second leading nation in terms of its share of “nano-prefixed” publications all over the world. Patent applications are also included in this study, as there are considerable efforts underway that aim to commercialise nanotechnology, and it is also an important aspect of R&D output. In particular, this study compares the rising pattern of nano-publication and nano-patents, to showcase the gap which lies between the knowledge base and technology base. Furthermore, this study investigates the research focus for both publications and patents in nanoscience and nanotechnology. The findings suggest that the strong presence of publications in MATERIALS SCIENCE, PHYSICAL CHEMISTRY and APPLIED PHYSICS are also in line with China’s overall research focus; while there are also many inventions focused on novel formulations of pharmaceutical products which have recently applied in Chinese Traditional Medicine. Finally, the cross-analysis of top organizations and Derwent Classification indicates that the collaboration links between organizations are relatively weak, though their technologies are highly concentrated in some similar areas. Collaborative research is a double edged-sword which may either mutually enhance the research base, or damage to the competitive advantage in commercialization.

Abstract: This study evaluates the adhesion of boride layers on the surface steels of AISI 4140, 8620, W2 and H13 by standard VDI 3198 [1], the surface hardened was carry out by the technique of power pack boriding at the temperatures of 1273 K, with time exposition of 6 and 8 h. The presence of boride phases was determinate by X-ray diffraction (XRD) analysis. A Rockwell C indentation tester was applied on the surface steels boriding, this impact test determines qualitatively the adhesion on layer/substrate indentation print and Vicker microhardnes was evaluate a load of 2.9 N on phase FeB and Fe2B, the steels have scale delamination H1 to H6.

Abstract: The warm compression experiment of medium carbon steel was conducted using the Gleeble-3500 thermal/mechanical simulator system. By the experiment, the warm deformation of medium carbon steel was studied within the temperature (500~700°C) and the strain rate (0.001~10s-1). The results indicate that the flow stress was increasing with the lowering temperature and the higher strain rate. And the stress-strain curves could be divided into four parts, including four stage of the Strain-Hardening, the First Softening, the Strong Softening, and the Steady Deformation. Dynamic recovery softening has little effect on the flow stress. The peak stress was caused by kink and fracture of the lamellar cementite. Strong softening stage was longer than other one, while its softening influence was stronger compared with hot deformation.

Abstract: Paclitaxel-loaded microspheres with magnetic Fe3O4 nanoparticles were synthesized with albumin as carrier. The morphology was characterized by high-resolution transmission electron microscopy (HRTEM). The drug-loading rate and entrapment rate of the microspheres were researched by ultraviolet and visible spectrophotometer. The inhibition action of taxol microspheres to growth of esophagus cancer Eca109 cell were examined by MTT method. The result shows that it is regular spherical. The mean size and size distribution of microspheres are 275.6nm and 144.3nm by Zetasizer3000. The drug-loading rate is 3.013% and the entrapment rate is 35.26%. It has excellent target-orientation and sustained-release property which can prevent the growth of Eca109 cell.

Abstract: The thermal simulation experiments of X80 pipeline steel were performed using Gleeble 1500 thermomechanical simulator. The controlled rolling and controlled cooling experiments were used to investigate the effect of cooling rate on the microstructures and mechanical properties of X80 pipeline steel. The results show that the cooling rate plays an important role in the ferrite grain size and the volume fraction of granular bainite. In order to obtain good comprehensive mechanical properties, it is necessary that the cooling rate should be 12~20°C/s.

Abstract: . Reformer furnace is the typical high-temperature equipment in petrochemical installations, but furnace pipe is the heart. The creep, thermal fatigue, thermal oxidation, carburization, corrosion and other phenomena may occur in harsh high temperature environments during service of furnace pipe. These factors make the properties degrade and life time short during all times of service. It will have significant economic losses if the rupture facture accident occurs suddenly. Comprehensive state analysis and life evaluation of reformer pipe run over service period to understand microstructure and property of furnace pipe by a range of material analysis methods, so that this will have important reference value for designer, manufacturer and user.