This paper aimed at demonstrating advantages of a new configuring finishing hob. The features in use of the new configuring finishing hob was discussed. The advantages of the new configuring finishing hob was demonstrated. The principles that eliminate machining errors by modulating the mounting parameters, and that prolong the life span of the new configuring finishing hob were proposed. This paper is of great importance to the rationality in use, specifying tolerances, and excavating the potential of the new configuring finishing hob.
Supposing that pavement structure composes of cubic cell structures,each made up of several pellets of different diameters based on the exam questions in the 4th National Mathematical Modeling Contest for Postgraduates,this paper simulates the quantitative relation between the percentage passing the sieve and the maximum pavement compaction and carries out analysis,evaluation and improvement for the model.
A gear meshing mathematical model was set up according to the tooth profile normal line method. The influence of the gear cutter-workpiece center distance on the tooth profile accuracy was discussed in spur gear cutting using a new type of gear cutter, with the center distance errors being ±0.005, ±0.01, ±0.02 and ±0.04 respectively. The results show that the machined tooth profile errors at the root circle is less than 1μm, while errors at other parts of the tooth profile are even smaller.
OBJECTIVE: To discuss the dosage regulations of poisonous TCM decoction pieces in Chinese Pharmacopoeia (2010 edition). METHODS: According to the dosage of poisonous and little-poisonous TCM decoction piece in Chinese Pharmacopoeia,prescriptions were selected from hospital, and over-dosage application were all recorded to calculate the frequency of above-normal dosage of each ingredient. RESULTS: Frequency of above-normal dosage was 65.25% in 19 little-poisonous ingredients, and was 66.7% in 29 poisonous drugs. CONCLUSION: The dosage regulation of TCM decoction pieces in Chinese Pharmacopoeia need to further study because of some unreasonable aspect.
Objective: To summarize the advances in research on the chemical components, pharmacological activity and clinica use of Hypericum japonicum injection in recent years. Methods: The related literature at home and abroad was collected and summarized. Results: There have been extracted over 50 chemical components from Hypericum japonicum. The pharmacological activity of Hypericum japonicum are widely proved in antibacteria, protection of liver, anticancer, and cardiovascular system action. As a clinical parenteral solution, it was used for treatment of urgent and chronic hepatitis. Concluslon: Hypericum japonicum contains rich chemical components, and father research would be done.
The lead-cooled fast reactor can be used for the post-processing of part of the minor actinides (MA) nuclides contained in the spent fuel. This study designs three modes of adding MA nuclides to analyze and study the effect of the MA nuclides transmutation on the core critical performance, core life cycle and fuel temperature coefficient thus to study the effect of the MA nuclides addition on the reactor safety performance. The results show that the addition of MA nuclides reduces the initial critical performance of the core; that the addition by either coating or mixing with fuel can significantly extend the life cycle of the lead-cooled fast reactor, while the addition of transmutation rod has different effect on the core life cycle depending on the rod location; and that the addition of MA nuclides causes the change of fuel temperature coefficient, which, however, remains negative. All of the three addition modes are feasible. In particular, attention should be paid to the effect of the transmutation rod location on the core life cycle. It is not advisable to distribute the transmutation rods in a concentrated area.
Abstract Limited studies focused on the slope rock foundation, and the application results of several methods differ considerably. In this paper, the coefficients of the Bell solution are first reduced by the length ratio of the sliding failure plane and the vertical area ratio of the overloaded soil. Then, the Hoek–Brown criterion for nonlinear failure is introduced, and the tangential line tangent to the Hoek–Brown failure criterion curve is calculated to replace the original M-C failure criterion. A method for determining the instantaneous friction angle and instantaneous cohesion under normal stress with the Bell solution failure mode is established, and the relationship between the instantaneous friction angle, instantaneous cohesion, and normal stress are discussed. The instantaneous friction angle decreases with the increase in normal stress, whereas the instantaneous cohesion increases with normal stress. The influence of geological strength index ( GSI ) and rock empirical parameter m i on bearing capacity coefficients N σ , N q , and N γ are also comprehensively analyzed. The coefficients increase with GSI and m i . In addition, the method is used to analyze the bearing capacity of rock foundation of a high and steep slope in an open-pit mine, and the results are compared with the slip-line method, which considers Hoek–Brown failure criterion and finite-element numerical simulation. The comparison demonstrates the acceptability of the proposed method.
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