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Abstract The hydrological condition in Fangezhuang Mine of Kailun is most complicated In June 1984, there was a special large inrush water accident occurred During the passed decade after the inrush water accident, an equivalent coil of a water temperature and electric resistance rate, a polonium-210 exploration and measurement, rock exploration meter, water drainage test, surface and underground bore hole exploration and measurement, radio wave mine roadway penetration meter, underground slot wave...

Abstract The hydrological condition in Fangezhuang Mine of Kailun is most complicated In June 1984, there was a special large inrush water accident occurred During the passed decade after the inrush water accident, an equivalent coil of a water temperature and electric resistance rate, a polonium-210 exploration and measurement, rock exploration meter, water drainage test, surface and underground bore hole exploration and measurement, radio wave mine roadway penetration meter, underground slot wave seismic method, elastic wave CT exploration and measurement, transient electric magnetic and special gravity Bouguer anomaly method and others have been applied for the prevention and control of mine underground water With physical exploration, chemical exploration, drilling exploration and comprehensive three dimension exploration technologies successfully applied, the plane configuration and space location of the sink hole were cleared and would provide full basic information for the prevention and control the mine water With the prevention and control of the mine water, the mine has reached the requirements of mine safety and production

开滦范各庄煤矿在水文地质条件极复杂条件下,应用综合立体勘探,多系统试验研究,优化设计及合理确定探查治理参数,对隐形垂直导水构造进行探查与治理,保证了矿井安全生产,治理时堵(水)供(水)相结合,化害为利。

A new approach to identify flaw position,size and shape is proposed in metallic materials.In the method,the perturbed magnetic field due to a flaw (crack) is approximated by the magnetic field produced by equivalent coils located at the conductor/air interface.This made it possible for the forward problems in inverse problems to be solved by analytical method instead of numerical methods.The new method is over ten times more rapid than the volumetric integral equation method.The reconstruction computations...

A new approach to identify flaw position,size and shape is proposed in metallic materials.In the method,the perturbed magnetic field due to a flaw (crack) is approximated by the magnetic field produced by equivalent coils located at the conductor/air interface.This made it possible for the forward problems in inverse problems to be solved by analytical method instead of numerical methods.The new method is over ten times more rapid than the volumetric integral equation method.The reconstruction computations of a straight and a cross cracks have demonstrated that the new method is correct, efficient and rapid.

本文提出一种快速识别金属材料中缺陷的位置、形状和大小的新方法 .该方法用位于分界面上的多个等效线圈产生的场等效逼近因缺陷存在引起的扰动场 ,使逆问题的求解中每次需用数值方法求解正问题的过程转变为每次用解析法求解正问题 .缺陷的重构速度比用体积分方程法提高十倍以上 .直线裂缝和十字型裂缝的重构计算证明本文方法是正确的和快速有效的

Equivalent eddy current method was put forward to identify flaw position, size and shape, in which the perturbed magnetic field due to a flaw (crack) was approximated by the magnetic field produced by equivalent coils located at the conductor/air interface. This made it possible for the forward problems in inverse problems to be solved by analytical method instead of numerical methods. The method was over ten times more rapid than the volumetric integral equation method. The reconstruction computations...

Equivalent eddy current method was put forward to identify flaw position, size and shape, in which the perturbed magnetic field due to a flaw (crack) was approximated by the magnetic field produced by equivalent coils located at the conductor/air interface. This made it possible for the forward problems in inverse problems to be solved by analytical method instead of numerical methods. The method was over ten times more rapid than the volumetric integral equation method. The reconstruction computations of straight and T shaped cracks demonstrated that the method was correct, efficient and rapid.

提出一种涡流等效源方法 ,用于识别缺陷的位置、形状和大小。该方法用位于分界面上的多个等效线圈产生的场等效逼近因缺陷引起的扰动场 ,使逆问题的求解中每次需用数值方法求解正问题的过程转变为每次用解析法求解正问题。缺陷的重构速度比用体积分方程法提高十倍以上。直线裂缝和 T型裂缝的重构计算证明 ,本文方法是正确的和快速有效的

 
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