螺杆泵定子注胶模具的改进设计

1．螺杆泵定子注胶模具改进的必要性 定子是井下单螺杆抽油泵最关键的部件，它的质量好坏直接影响整台泵的效率和使用寿命。在螺杆泵试制过程中，曾经遇到定、转子线形啮合很好，且定、转子配合过盈也很理想，但整体泵没有形成一个完整的密封腔，且泵的启动扭矩较大、容积效率却较低的现象。     

Numerical linear analysis of the effects of diamagnetic and shear flow on ballooning modes

The linear analysis of the influence of diamagnetic effect and toroidal rotation at the edge of tokamak plasmas with BOUT++ is discussed in this paper.This analysis is done by solving the dispersion relation,which is calculated through the numerical integration of the terms with different physics.This method is able to reveal the contributions of the different terms to the total growth rate.The diamagnetic effect stabilizes the ideal ballooning modes through inhibiting the contribution of curvature.The toroidal rotation effect is also able to suppress the curvaturedriving term,and the stronger shearing rate leads to a stronger stabilization effect.In addition,through linear analysis using the energy form,the curvature-driving term provides the free energy absorbed by the line-bending term,diamagnetic term and convective term.     

Design and platform testing of the compact torus central fueling device for the EAST tokamak

Compact torus(CT) injection is a highly promising technique for the central fueling of future reactor-grade fusion devices since it features extremely high injection velocity and relatively high plasma mass. Recently, a CT injector for the EAST tokamak, EAST-CTI, was developed and platform-tested. In the first round of experiments conducted with low parameter settings, the maximum velocity and mass of the CT plasma were 150 km·s^-1 and 90 μg, respectively.However, the parameters obtain...     

无枪身导爆索夹紧装置设计

油气井无枪身导爆索在高温高压、有腐蚀性的井液中工作，这对导爆索的密封性能提出了很高的要求，如果存在密封性能不好或耐温耐压指标达不到要求等问题，将会产生拒爆或部分爆轰，进而影响整个射孔作业过程。     

2022年国际消防关键词

<正>2022年，全球火灾复杂多变，呈多发态势，给消防安全应急处置带来很大挑战。在此背景下，消防标准化建设不断完善，新技术、新产品不断涌现，相关举措和科学研究在全球范围内逐步开展，而实战化的比赛交流，为相关国家提升应急处置能力提供了平台。我们盘点国际消防的大事要事与热门话题，梳理出2022年国际消防关键词。