Transition metal compounds have attracted significant attention as anode materials for lithium⁃ion batteries （LIBs） owing to their high theoretical capacities. Molybdenum⁃based compounds exhibit superior electrical conductivity compared to conventional metal oxides. However, their cycling stability requires further improvement. An ultrasonic spray pyrolysis method was used to prepare self⁃supported MoO2/MoO3/C composite microspheres, and the mass concentration of hydrothermal glucose⁃derived carbon quantum dots was exploited to optimize the microstructures of the composites. A suite of characterization techniques including scanning electron microscopy (SEM), X⁃ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA) were employed to systematically investigate the micromorphology and crystal structural features of the as⁃prepared materials. Lithium storage and electrochemical performance tests were also carried out. The results demonstrate that MoO2/MoO3 heterojunctions are homogeneously embedded within the carbon matrix to form a stable conductive network. After 100 cycles at a current density of 0.2 A/g, the composite retains a discharge specific capacity of 914.8 mA·h/g, exhibiting outstanding cycling stability and lithium storage capability. This study offers an effective approach for designing high⁃performance molybdenum⁃based anode materials for LIBs.

Two ordinary heavy oils and three super heavy oils in shengli oil field are used to study and the effect of temperature and viscosity on the moisture inverted point and the viscous multiples. The results show that the inverted point increases with increasing of the temperature, and the viscous multiples of the inverted point also increases. While the viscous multiples of the same moisture content firstincreases and then decreases. Comparing the inverted point and viscous multiples, it is found that the on e which has low viscosity will have high inverted point, low viscous multiples of the same moisture content and high viscous multiples of the inverted point.

Viscosity reducer and polymers system suitable for heavy oil of block Gudao2 of Shengli oilfield were selected so that recovery and microscopic mechanism of viscosity reducer and polymer flooding were compared. The results showed that the ultimate recovery rate of water flooding was only 41.1% and after water flooding there was large presence of residual oil and the film and lump. The recovery rate of XJ and OP10 viscosity reducer flooding after water flooding was increased by 18.67%, which mainly relied on transport of large oil particles after deformation and emulsification to reduce the flow resistance and boosting function of dispersed oil particles to oil film and stripping of the remaining oil by drawing. The recovery rate of APP5 polymer flooding after water flooding was increased by 18.55% by increasing the sweep area and the pull effect on the oil film and blindresidual oil, so polymer flooding compared with viscosity reducer flooding was more valuable.

LiFePO ₄/C cathode material was prepared from solid-state method using Fe ₂O ₃,LiH ₂PO ₄,black carbon and sugar as the starting materials.The synthesized material was characterized by means of X-ray diffraction (XRD),scanning electron microscope (SEM) and galvanostatic charge/discharge cycling.The results show that the products are single phases and all the peaks are indexable to the orthorhombic structure.The synthesized LiFePO ₄/C exhibits an excellent electrochemical property with initial discharge specific capacity of 156.3 mAh/g and the discharge specific capacity of 157.7 mAh/g after 30 cycles in the voltage range 2.50~4.20V (versusLi+/Li) at a constant current density of 0.1 mA/cm ².

With the aid of the large-scale flow loop,the initial restart pressure wave propagation has been measured and studied.The related in fluencing factors have been analyzed.Put forward the temperature effect coefficient concept for the first time,establishes the new computation model to forecast the initial restart wave velocity.Through flow loop's two different diameter test data contrast,the new model can forecast the initial restart wave velocity accurately.

The composite gel polymer electrolyte (CGPE) with high ionic conductivity was prepared, in which poly(vinylidene fluoride-hexafluoropropylene (PVDF-HFP) served as the based polymer, polymethyl methacrylate (PMMA) as the blending agent, LiPF₆ as the conducting salt, and polyvinylpyrrolidone (PVP) as the plasticizer. The structures were characterized by using IR, the ionic conductivity was determined by AC impedance, and the electrochemical stability was measured by linear sweep voltammetry. The charge-discharge properties of the Li-ion batteries in which the CGPE served as membrane were investigated．The results show that the CGPE conductivity is more than 10^-3S/cm, and electrochemical window is stable under 4.65 V when 20% PMMA was mixed. When using LiFePO₄ as the cathode material, the initial discharge capacities of Li-ion cell in the CGPE were 138 and 98.3 mAh/g at 0.1 C and 0.2 C rate respectively. 

The high purity cyclopentadiene(CPD) was prepared by using industrial raw dicyclopentadiene(DCPD). The raw materials and cyclopentadiene obtained by the depolymerization of dicyclopentadiene were analyzed by gas chromatography with SE-30 quartz capillary column. The raw material was purified, then was carried out thermal dimerization at 120 ℃ and depolymerization at 175~180 ℃. The purity of cyclopentadiene obtained by this way is more than 99%. Cyclopentadiene is very easy to polymerize and the purity of it after long time decreases remarkably, so it must be used as soon as.

When jams happen to a oil pipeline suddenly, transient pressure mutations will appear in the blocked pipe. It causes a pressurization wave and a decompression wave which respectively spread to the upstream and the downstream at a certain speed. Through establishing hydraulic transient model of pipe jams, using Visual c++ 6.0 to program the characteristics analysis program of jams hydraulic, taking specific pipeline, the characteristics of transient hydraulic which was caused by different jams acreage was simulated. The simulated results show that pressure and flow rate is affected by the different jams acreage. 

LiNi _0.8Co _0.2O ₂ cathode material for lithium-ion batteries was prepared from sol-gel method using nitrates and starch as the starting materials. The synthesized material was characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and galvanostatic charge/discharge cycling. The XRD data of the product show that the synthesized material are single phases and all the peaks are indexable to the layered α-NaFeO ₂ structure. The synthesized LiNi _0.8Co _0.2O ₂ presents a narrow distribution of small particles and exhibits a good electrochemical property with initial discharge specific capacity of 183.1 mAh/g and the discharge specific capacity of 171.3 mAh/g after 50 cycles in the voltage range 2.75~4.50 V (versus Li+/Li) at a constant current density of 0.2 mA/cm2.

Using the intrinsic polyaniline and two doped polyanilines as the determined samples prepared in the laboratory, the conductivities were measured by single sweep voltametric method on the potentiostat with two electrodes. The contact electric resistance was influenced by the pressure between the electrode and sample during the measurement, which could be ignored when the pressure was greater than 0.5 MPa. The measured conductivities of the polyaniline samples are 5.92×10 ^-5, 1.52×10 ^-2 and 2.68×10 ^-1 S/cm respectively. The results show that the electric conductivity of the doped polyaniline increased greatly. The voltametric method is not only simple and convenient, but also suitable for the conductivity measurement of semiconductors. 

The purification of cyclopentadiene and the electrosynthesis of nickelocene were studied. Nickelocene was electrochemical synthesized by using purified cyclopentadiene as the raw material, and metal nickel used as both anode and cathode, sodium bromide as the conducting salt, N,N-dimethylformamide (DMF) as the organic solvent, and nitrogen as the protection gas of the solution. In the dicyclopentadiene purification experiment, the best depolymerization and best circumfluence temperature of cyclopentadiene are 170 ℃ and 120 ℃ respectively. The purification process above must be continuously carried on. The purities of dicyclopentadiene and cyclopentadiene determined by gas chromatography are 95.4% and 97.3%. In the electrochemical synthesis experiment, the electrode potential changes are first determined using calomel electrode as the reference electrode; meanwhile the polarizing curves are also measured in order to confirm the best current density, i.e. 3.93 mA/cm2. Secondly the best reaction time determined is 210 min through the observation of the solution color changes, the electrode potential changes, the ultraviolet and the infrared spectrogram of the solution. Finally the current efficiency is 82.87% by calculating the mass decrement of nickel board during the experiment. 