Advanced Materials Research Vol. 773

Abstract: LiFePO₄/C was successfully synthesized by one-step solid-state reaction using Fe₂O₃, LiH₂PO₄ and sucrose as raw materials. The effect of synthesis temperature and sintering atmosphere on the electrochemical performance were investigated. LiFePO₄/C materials were characterized by differential scanning calorimetry and thermogravimetry, X-ray diffraction, scanning electron microscopy and XPS. The results show that the synthesis temperature between 750 °C and 800 °C were appropriate and the reductive ambience can enhance the electrochemical performance effectively especially at high rates. The precursor calcined at 750°C for 5h in a N₂+5%H₂ atmosphere exhibited the highest discharge capacity of 155 mAh/g at 0.1C and 141 mAh/g at 1C and showed the best cycle performance.

Abstract: This paper has analyzed the geology and engineering factors of poor cement quality in leakage zone of Jiu Fotang Formation in Naiman Block. Lab evaluation shows that the value of YP/PV of Ceram site-weighted fuzzy ball pad fluid is more than 1.0Pa/mPas, cuttings recovery rate is 94% and bearing pressure is more than 5MPa. 10m³ of pad fluid was pumped to the leakage section of 2310-1865m of Jiu Fotang formation in the well N-X-Y, and pump pressure decreased slightly from 3.8MPa to 3.6MPa and so was the return to surface. However, for this severe leaking zone, this leakage can be accepted. Cement quality was evaluated as acceptable by logging. The problem of cement slurry leakage was solved by fuzzy ball pad fluid and cement quality was improved, so the remedial measure for trial production test was skipped, and then the job cost was reduced and the application of fuzzy ball was also broadened.

Abstract: At present, coal is still the primacy of China's energy structure, and this situation will not change in a short time. Coal-formed Gas Reservoir quality and the predicting method have also become one of the urgent needs to address the issue of energy exploration, but the lateral variation of the coal-formed gas reservoir is a common geological phenomenon in the coal mine, if the prediction error is too large, it will greatly impact on the production of coal mine. Especially in the area where has complex structure characteristics, the reservoirs are impacted by structural changes, the reservoir predicting become the most important job and the most difficult job. This paper take the example of DaCheng, the research carried out the sedimentary reservoir characteristics, the coal body structure, the coal thickness, the heterogeneity of the coal seams and collapse columns of coal reservoir, and then reservoir fine evaluation was done combined Micro and Macro, Qualitative and Quantitative methods.

Abstract: This paper studies a discrete Competitive model and provides a set of sufficient conditions for the existence and stability of the equilibrium of the model. By obtaining the optimal harvest strategy of the two equilibrium model through the Lagrange multiplier method and discrete pontrjagin maximum principle, it provides a theoretical direction for the actual production.

Abstract: Based on the characteristics and special function of gymnasiums, this thesis made a comprehensive assessment on mode selection of air distribution in gymnasiums by proposing that air distribution in gymnasiums be totally evaluated from the standpoints of degree of satisfaction in auditoriums and playing areas, improved air exchange efficiency and improved afterheat elimination efficiency. The thesis made a general conclusion of evaluation system of air distribution established by domestic researchers on gymnasiums, hoping to make contributions to the gymnasium undertaking of our country.

Abstract: In this paper, the author utilizes the game theory to analyze the interest expression, game strategies and the inter-game relation of stakeholders including government, developers, land-contributing units and citizens in the major projects. Then the game model is built to focus on the game relations between the government and landcontributing units as well as citizens, aiming to identify factors that promote the balance. Finally, the game solutions are proposed.

Abstract: Decontamination level and residual amount of polycyclic aromatic hydrocarbons (PAHs) were investigated by ex-situ remediation technologies including biopile, soil washing and thermal desorption in a field level. After the remediation, 16 USEPA priority PAHs were decontaminated from 99.3% to 99.9% for thermal desorption, from 17.9% to 82.1% for biopile and from-27.6% to 84.3% for soil washing. Residual PAHs amount in soils by thermal desorption was below the local soil screening level, differently from that by biopile and soil washing. Especially for high molecular weight PAHs, i.e. 5-6 rings PAHs, residual amount exceeded over the screening lever 4 to 197 times for biopile and 17 to 421 times for soil washing. Additional factors, such as cost, time, operation and maintainance etc. for remedial technology selection and contaminant bioavailability in soil matrix for remediation target values, were proposed to be paid more attention for specific contaminated sites.

Abstract: In this paper, the numerical model of multi-stage liquid column scrubber was established. The flow field of liquid column scrubber with different inlet structure was respectively simulated by a commercial CFD code, Fluent. Considering the distribution characteristics of static pressure and velocity in the scrubber, this inlet type, single horizontal gas inlet with a notch at the bottom, is regarded as the most reasonable structure. On one hand, that structure has uniform distribution of static pressure. On the other hand, the velocity profile of its field presents saddle shape, i.e. the low central velocity exists between two peaks, which could contribute to weakening wall-flow phenomenon and obtaining uniform gas-liquid distribution.

Abstract: This paper regards the Indocalamus latifolius leaves as the research object, aiming to explore the influence of the new processing technologies and the traditional ones on the Indocalamus latifolius leaves through technologies of harvesting, fractionating, drying and vacuum sealing, marinating, and freezing, etc. Then it prepares the product grade, physicochemical index, health indicators and product qualification criteria to provide a theoretical reference for their further development.

Abstract: The comprehensive analysis of rare earth elements (REEs) of red mudstones in the lower part of the fourth member of Shahejie Formation (S₄) in Dongying Depression shows that the red mudstones in the lower S₄ of Dongying Depression originate from multi-sources. Red mudstones can be classified into three major types based on the characteristics of their sedimentary structures, which are closely relevant to REEs of red mudstones. The three types of red mudstones are obviously different in distribution: the first type is close to eolian deposits, indicating their relevance to wind action in formation; the second type, partly similar to the first type, has obvious differences with the first type, which can be deduced that it is formed through secondary transformation; the third type embraces the alluvial characteristics, suggesting its good inheritance of the surrounding parent rocks in the distribution of REEs.