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The fundamental and higher-order harmonic ultrasound fields of a zeroth-order Bessel ultrasound field and focused Gaussian field in absorbing medium are computed and simulated by solving the KZK equation using a frequency domain finite difference method.

通过频域有限差分方法求解KZK方程，对吸收媒质中的零阶Bessel超声场、Gauss聚焦超声场进行计算，得到基波和高次谐波声场的数值解和仿真图，计算仿真结果验证了上述的理论结论。

M/M/2 queueing system with absorbing state have been widely used in many fields such as transportation and service profession.

带吸收状态的M/M/2排队系统在交通，服务行业等领域中有广泛应用。

However, for different sound fields, because of the difference in the space volume, shape and absorption coefficient, the receiving radius are different.

但对不同的声场空间来说，由于空间体积、形状和吸声系数的变化，声线密度是不同的，因此接收球半径也会不同。

ABSTRACT Turbo code is a powerful error correcting technique that has been used in many fields such as deep space communications, wireless mobile information transmission, digital subscriber loop, and large capacity magnetic storage.

Turbo码是一种具有极强纠错能力的差错控制编码技术，它已经被广泛地应用于诸如深空通信、移动无线传输、数字用户环路以及大容量磁存储系统等许多的领域。

The viewpoint that feature is an entity or abstractor with special meanings based on application fields was proposed.

提出特征是某一应用领域内具有特定意义的实体或抽象体。

In our knowledge of Chinese contemporary and modern history, there are still many fields remaining untouched, whose mystery and abstrusity make us feel confused and helpless, just like when we face heaven and ocean. This knowledge can not even be comparable to our understanding of ancient history.

对于中国近现代史的认识至少在现在还有很多未知领域，其神秘和深邃如同我们面对天体和大洋一样茫然无助，甚至比起我们对于古代史的了解更加斑驳陆离。

So, more and more people pay attention to this method in AC drive fields.

因此，在交流传动领域中，越来越受到学者的关注。

It is composed of leaders in the information technology and complementary fields from industry and academia.

它由信息技术的带端空白段和工业和学术界的补充的野外组成。

It is of practical use for developing new productions and producing middle and small batch products in scientific research, academic institution and medicine fields.

尤其适合科研生产单位的新产品开发及中、小批量的生产。

I wish I can cooperate with people in different academic fields of this country.

我希望能和国内不同学科领域内的人合作。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。