Advanced Materials Research Vol. 908

Abstract: As our country speeds up the proceedings of industrialization after the establishment of China, some historic cities are become the key projects of construction planning of modern industry. Luoyang adopts another way to build their new region of industry, which is selecting new area far from the old one, and finally become a city with several different centers of functions. At the same time, the industry region of Luoyang uses the construction material that is good at protecting historic site and reflecting the characteristic of the historic and culture. This method not only protects the historical site, but also establishes the new region of modern industry, and the successful experience can be used to conduct the planning of other historic cities.

Abstract: The Apocynum venetum L. of Apocynaceae plant is a traditional Chinese herbal medicine. In this paper, we analyzed qualitatively the active compounds in the aqueous extract from the leaves of Apocynum venetum L. by HPLCMS and HPLCDAD. The aqueous extracts method of the mainly active compounds from dried leaves of Apocynum venetum L. was based on HPLC/DAD coupled to an electrospray ionization (ESI) interface. Overall, 8 constituents were separated and identified, which belong to flavonoids.

Abstract: The products and carbonated efficiency were two major aspects on carbonation of waste mineral and the carbonated efficiency and products morphology would make a very big difference under the different molding pressures. The conditions of this study were as follows: water to solid ratio (W/S), CO2 pressure and mass fraction were 0.15, 0.2 MPa and 99.9%,respectively, and the molding pressures were ranged from 0 MPa to 8 MPa. After carbonation, the carbonated efficiency and microstructure were perform with CO2 mass gain degree and SEM, respectively. As the results, low molding pressure was beneficial to early carbonation and high molding pressure can improve later carbonation. The products morphology were became from rhombohedron to smooth ellipsoid with the molding pressure increased. The XRD pattern showed that only calcite was formed in this study.

Abstract: In order to improve the performance of cement mortar, using compression test, flexural strength test, splitting test, adhesion test and dynamic modulus test, the improvement effect of carboxylic styrene butadiene latex on the mechanical properties of cement mortar was explored, Research results showed that with the increases the polymer-cement ratio, the flexural strength, compressive strength, splitting strength and adhesive strength of mechanism mortar of modified cement mortar all increase, and the dynamic elastic modulus decreases. Carboxylic styrene butadiene latex enhances the flexibility and anti-deforming capability of cement mortar, thereby also improves the pavement performance. The results clarify the properties variation law of cement mortar before and after modification, this provides scientific guidance for polymer latex modified cement mortar mix design.

Abstract: The solubility of oxygen (O2) and nitrogen (N2) in the liquid oil (non-volatile oil: soybean oil and sunflower oil, volatile oil: aviation kerosene) were measured in the temperature with 293.15 K, 303.15 K and 313.15 K, and pressures up to 0.1MPa. The experimental data in soybean oil and sunflower oil were processed by R-K gas state equation, and based on this to analysis the data in volatile oil: aviation kerosene. The results show that solubility of O2 and N2 in liquids is in linear relationship with pressure, but nonlinear relationship with temperature, while, under the condition of same temperature and pressure, solubility of O2 is far greater than N2 both in non-volatile oil and volatile oil. The relationship between the solubility of oxygen (nitrogen) and pressure (temperature) can be useful in practical applications. Specifically speaking, it provides valuable references to help developing the storage technology of edible oil and extending the shelf life of food, etc.

Abstract: The Liquidus Temperature of Molten Salt Nacl-Kcl-Na₂WO₄ System was Measured by Differential Thermal Analysis. the Results Show that, in the Molten Salt System, when XNa2WO4≤0.7 Eutectic Temperature is 555 °C and a Phase Transition Temperature is 512.8 °C, Eutectic Composition Become XNaCl= 0.35, XKCl= 0.35, XNa2WO4= 0.3; when XNa2WO4>0.7, Eutectic Temperature and a Phase Transition Temperature are Respectively 613 °C and 574.4 °C, Eutectic Composition Become XNaCl= 0.1, XKCl= 0.1, XNa2WO4= 0.8.

Abstract: The liquidus temperature of molten salt NaCl-KCl-Na₃WO₃F₃ system was measured by differential thermal analysis. The results show that in the molten salt system when XNaCl:XKCl=1:1, XNa₃WO₃F₃<0.6 the liquidus temperature decreased with increase of Na₃WO₃F₃ content; when XNaCl:XKCl=1:1, XNa₃WO₃F₃> 0.6 the liquidus temperature increased with the increase of Na₃WO₃F₃ content; the eutectic temperature is 612.9 °C, the eutectic composition is XNaCl=0.2, XKCl=0.2, XNa₃WO₃F₃=0.6.

Abstract: The conditions of oxidation of nitrite by manganese dioxide in the solution was studied, with sodium nitrite was used as the sample, respectively. Experiment results showed that the stronger oxidation to nitrite in strong acid, but nitrous acid is instable, escaping NO₂ out from the solution. When pH=3.5, the oxidation rate of nitrite with manganese dioxide was better. The concentration of nitrite tended forward to be stable after 30min. After reaction, the oxidizing power of manganese dioxide which was treated by dilute sulfuric acid wasn't enhanced. The manganese dioxide treated by acid reacted with fresh nitrite solution and the effect wasn't good. The process of oxidation could be go on and the concentration of nitrite would decrease obviously when fresh manganese dioxide used to react the same original nitrite. Maybe some active sites exist at the surface of manganese dioxide. When the reaction equilibrium was reached, the active point at the surface of manganese dioxide would probably have disappeared. The property of oxidation of manganese dioxide to nitrite could be used in treat NO₂ and nitrite. Combining the two methods which absorption of NO₂ by base and oxidation of NO₂ or nitrite by manganese dioxide, NO₂ would be treated completely and treatment cost would be lower.

Abstract: The solubility of WO₃ in NaCl-KCl-NaF-WO₃ molten salt system was measured by isothermal saturation method. The results show that in the molten salt system when the temperature rise to 700 °C the saturation time of the WO₃ dissolution time is 6 hours. When the temperature rise to 730 °C from 700 °C the saturation time of the WO₃ dissolution time needs 80 minutes. As shown in the XRD pattern, there are NaCl, KCl, NaF, WO₃, Na₅W₃O₉F₅, Na₃WO₃F₃ and NaWO₃F in the molten salt.

Abstract: The solubility of WO₃ in NaCl-KCl-NaF-WO₃ molten salt system was measured by isothermal saturation method. The results show that in the molten salt system the solubility of WO₃ increased with the increase of temperature from 700 °C to 820 °C, and the relationship between solubility and temperature is approximately linear. As shown in the XRD pattern, there are NaCl, KCl, NaF, WO₃, Na₅W₃O₉F₅, Na₃WO₃F₃ and NaWO₃F in the molten salt, so the dissolution of WO₃ is the result of both physical dissolution and chemical dissolution.