Many factors affect the determination of moisture content in oil by Karl Fischer Method; there are objective factors such as water, samples and temperature environment, respectively 46# turbine oil and 25# transformer oil for example, from a gross error, correlation coefficient, and other subjective perspective, the causes of error are analyzed; correlation coefficient very close to 1 and most of the relative error in ( -0.15,0.00) are discussed, which shows that high measuring accuracy and precision of this method.
A new generation of gun propellant, named Modified Single Base Propellant (MSBP), was successfully studied recently. The MSBP was prepared from single base propellant grain by impregnation with blasting oil, followed by deterring with deterrent in water medium. The function components in this propellant were nitroglycerine (NG) and polymer ester (NA). The concentration profiles of them were studied by Fourier Transform Infrared (FTIR) Microspectroscopy. The combustion performance of this propellant was investigated by means of closed-bomb tests and interior ballistic tests. It is found that the concentration profile of the function component is the key factor in MSBP. The static combustion performance and the characteristic of the interior ballistic are dependent on the concentration profile of function component.
The thermal conductivity of silicon nanowire doped with Germanium in different geometrical distributions was investigated with nonequilibrium molecular dynamics method. Five different geometrical arrangements of the impurities that influence the thermal conductivity properties of silicon nanowires were investigated, which include centralization doping, uniform doping, non-uniform doping, random doping and cubic pattern doping. The results demonstrate that the uniformity of the impurity positions has a substantial influence on the thermal conductivity of silicon nanowires under the same impurity concentration.
The microhardness and microstructure of Ti-24Al-15Nb-1.5Mo/TC11 dual alloy joining interface processed by different heat treatment regimes were investigated. The results show that the microhardness of the weld zone and Ti-24Al-15Nb-1.5Mo alloy side of the dual alloy processed by gradient heat treatment are higher than that of the specimen processed by balance heat treatment. Moreover, the microstructure differences between the specimens processed by gradient heat treatment and balance heat treatment are very obvious, particularly in the interface between the TC11 alloy and the weld zone. While the joining interface is processed by gradient heat treatment, the microstructure change homogeneously, and the demarcation lines are ambiguous. However, for the joining interface processed by balance heat treatment, the demarcation lines are very obvious, and the microstructure of the TC11 alloy side is bi-morphic, the lath is short and coarse. Therefore, the interface integrity of the dual alloy processed by gradient heat treatment is better, which is an adoptable method to improve the properties of the dissimilar alloy joining interface.
There are many uncertain factors in the process of reservoir’s operation. For the reasons, the "deterministic theory" must turn to" probability theory", and it becomes necessary to strengthen risk analysis. Summarize the connotation of reservoir risk analysis, progress in research of risk analysis for reservoir inflow forecasting, risk analysis for reservoir operation, risk analysis for flood protection and flood discharge , and reservoir multi-objective risk analysis. There are so much influence factors and much of them uncertainly, not enough research on multiple targets and multiple factors, not much apply on new risk analysis theories and methods. Therefore, it should research more on the fields of risk identification, reducing the impact of human factors, new analysis methods and coupling methods.
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