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利用检波器串获取井口时间的方法探讨 被引量:2
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作者 曹雄伟 司亚 +3 位作者 陶林 谢廷益 李国圆 张学银 《石油管材与仪器》 2017年第6期75-78,86,共5页
地震勘探中井口时间的大小取决于炸药的激发深度和地震波的传播速度,在巨厚腐殖质区域的井口时间可达到100 ms以上,超出了SHOTPROII爆炸机的接收时间范围,爆炸机无法接收到正确的井口时间。为了爆炸机获取正确的井口时间,提出了一种新... 地震勘探中井口时间的大小取决于炸药的激发深度和地震波的传播速度,在巨厚腐殖质区域的井口时间可达到100 ms以上,超出了SHOTPROII爆炸机的接收时间范围,爆炸机无法接收到正确的井口时间。为了爆炸机获取正确的井口时间,提出了一种新的方法,在井口旁另外插一支SG10检波器,连接大线,直接用地震仪器接收,读取该道初至时间来修正爆炸机的井口时间。通过和正确的井口时间、最近道的初至时间对比,证明了该方法的可行性。随着腐殖质层厚度的加大,采集到的初至时间出现延迟,通过对地震波和对单支SG10检波器类型进行分析,出现初至延迟的原因是单支SG10检波器接收到的地震波初至能量弱,无法准确起跳。将单支SG10检波器改为单个JSX-2检波器,得到了正确的初至时间。随着腐殖质层厚度的继续加大,采集到的初至时间再次出现延迟,通过将单个JSX-2检波器改为1串(12个)SG10检波器,得到了正确的初至时间。 展开更多
关键词 地震勘探 井口时间 巨厚腐殖质 爆炸机 大线 最近道
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Finite Range Effects on Fusion and/or Breakup of ~6He+^(238)U and ^(11)Li+^(208)Pb Systems 被引量:1
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作者 Sukhvinder S.Duhan Manjeet Singh +1 位作者 Rajesh Kharab H.C.Sharma 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第4期649-654,共6页
We have studied the effects of the finite range on the fusion and/or breakup of ^6He^+238U and ^11Li+^208pb Pb dynamic polarization potential approach. It has been found of the interaction between the fragments of t... We have studied the effects of the finite range on the fusion and/or breakup of ^6He^+238U and ^11Li+^208pb Pb dynamic polarization potential approach. It has been found of the interaction between the fragments of the projectile systems at near barrier energies within the framework of that at near barrier energies the maximum flux is lost to the breakup channel and at energies well above the Coulomb barrier the fusion coupled with the breakup channel opens up, initially with sharp rise and later becoming saturated at energy nearly twice of the Coulomb barrier. Further, it is found that the breakup cross section increases with the increasing range of the interaction between the fragments of the projectile while the fusion coupled with the breakup channel cross section decreases with the increasing range. 展开更多
关键词 FUSION BREAKUP polarization potential and weakly bound nuclei
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Optimal trajectory planning for natural biped walking locomotion
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作者 刘荣强 焦映厚 陈照波 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2003年第2期175-182,共8页
An optimal trajectory planning method has been proposed for the walking locomotion of a biped mechanical system with thighs, shanks and small feet, which is modelled as a 3 DOF link system consisting of an inverted pe... An optimal trajectory planning method has been proposed for the walking locomotion of a biped mechanical system with thighs, shanks and small feet, which is modelled as a 3 DOF link system consisting of an inverted pendulum and a 2 DOF swing leg. The locomotion of swing and supporting legs is solved by the optimal trajectory planning based on function approximation. The optimal trajectory planning based on function approximation. The optimal walking locomotion solution with minimum square of input torque exhibits a natural walking gait with one step period of 0.64 s similar to the human walking gait by using the link parameters of an adult’s leg. It is concluded from the computation results that the method proposed in this paper has been proved to be an effective tool for solving the optimal walking locomotion and joint control torque problems for a 3 DOF biped mechanism; when the ankle joint of the supporting leg is a passive joint, a nearly, optimal walking solution can be obtained at t 1=0.49 s and t 2=10 s, and however, when the knee is a passive joint, it is impossible to obtain a solution which satisfies the constraint condition; for the link parameters used in this paper, the length of an optimal stride is 0.3 m. 展开更多
关键词 ROBOT MECHANISM walking locomotion optimal trajectory
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