يعرض 1,981 - 2,000 نتائج من 21,342 نتيجة بحث عن '(( significant economic decrease ) OR ( significant decrease decrease ))', وقت الاستعلام: 0.33s تنقيح النتائج
  1. 1981
  2. 1982
  3. 1983
  4. 1984
  5. 1985
  6. 1986
  7. 1987
  8. 1988
  9. 1989
  10. 1990
  11. 1991
  12. 1992
  13. 1993
  14. 1994
  15. 1995
  16. 1996
  17. 1997

    Significance analysis data. حسب Lei Zhu (16642)

    منشور في 2025
    "…The results indicate that: (1) The manifestation of mining pressure in gangue backfill mining is influenced by factors such as mining height and backfill collapse ratio; (2) Under the support of coal gangue, the concentrated stress in the coal seam significantly decreases, forming an arched shape according to the mining stages; (3) The range of plastic failure in the coal seam remains relatively stable under gangue backfill mining, with the plastic zone of the roof plate exhibiting a strip-like distribution; (4) Both range analysis and variance analysis revealed that the sensitivity ranking is backfill collapse ratio > mining height > elastic modulus. …"
  18. 1998
  19. 1999
  20. 2000