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1)  sphere tracing
球体追踪
1.
A dynamic parallax occlusion mapping algorithm based on per-pixel sphere tracing is proposed,in which the height map of the texture is preprocessed to build a shortest distance map for the practical surface saved in the height map from any points within texture height space.
提出了一种利用球体追踪进行逐像素光照计算的动态视差遮挡映射算法。
2)  eyeball tracking
眼球追踪
3)  traitor tracing scheme
追踪体制
1.
This paper proposed a new discrete logarithm based public key traitor tracing scheme.
 给出了一个新的基于离散对数的公钥追踪体制。
4)  attitude pursuit guidance
弹体追踪
1.
The pulsed proportional navigation(PPN) guidance and attitude pursuit guidance(APG) by the concept of zero effort miss(ZEM) were established,and the corresponding ignition control strategy of the pulse jet was presented.
建立基于零效脱靶量概念的两种末制导律——弹体追踪和脉冲比例导引,并给出对应的脉冲发动机点火控制方法。
5)  Body-Tracing
体元追踪
6)  sandstone trace
砂体追踪
补充资料:空心超导球体(hollowsuperconductingsphere)
空心超导球体(hollowsuperconductingsphere)

设内外半径分别为r1和r2(r1≤r≤r2),壁厚d=r2-r1的第一类超导体的空心球体处于外磁场强度H0中。令ζ=r/δ,Δ=d/δ,δ=δ0/ψ,δ0为大样品弱磁场穿透深度,ψ是有序参量。设H1和M分别是空腔中磁场强度和样品磁矩。按GL理论,徐龙道和Zharkov给出的部分主要结果如下:

`\zeta_1\gt\gt1`和$\Delta\gt\gt1$时,

H1=6H0ζ2ζ1-2e-Δ,
M=-H0r23(1-3δ/r2)/2

所以对厚壁样品,腔内H1≈0,只要H0低于临界磁场,球壳层可视为磁屏蔽物,样品可利用为磁屏蔽体。对$\zeta_1\gt\gt1$和$\Delta\lt\lt1$的情形,则

H1=H0/(1 ζ1Δ/3),
M=-H0r23[1-1/(1 ζ1Δ/3)]/2

可见,若$\zeta_1\Delta\gt\gt1$,则$H_1\lt\ltH_0$或H1≈0。所以,虽然$d\lt\lt\delta$,但磁场仍被屏蔽而很难透入空腔,称ζ1Δ/3为空心超导球体的屏蔽因子。相反,$\zeta_1\Delta\lt\lt1$,则H1≈H0,球壳层几乎不起屏蔽磁场的作用。对M讲,也可作同样讨论。此外,类似于实心小样品,也可求出各种临界磁场HK1,HK,HK2和临界尺寸等。

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