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wangcp1971

金虫 (小有名气)

[求助] 请做吸波材料的高手帮忙修改论文中一段话

论文写作在讨论材料吸波性能时,老板觉得写得不好,但是又没给出具体的修改意见,求高手帮忙:有重谢!
In general, EM wave absorption properties are dependent on not only absorption properties but also impedance matching. The PANI/NZFO hybrid nanorods display strong magnetic loss and significant dielectric loss, and will be candidates for broadband and highly efficient microwave absorbing materials. To reveal the microwave absorption properties of the as-synthesized PANI/NZFO hybrid nanorod, the reflection loss (RL) values of all samples are calculated according to the transmission line theory as follows:
                         (1)
                                  (2)
Where Zin is the input impedance of the absorber, Z0 is the intrinsic impedance of free space. μr and εr are the relative complex permeability and permittivity of the absorber medium,  is the frequency of EM wave, d is the coating thickness, c is the velocity of light.
As we know, the thickness of absorbent is one of the important parameters that affects width and intensity of microwave absorbance bands. In order to find the matching thickness of samples, we further calculated the RL value of three samples with different thicknesses of 2.0, 2.5, 3.0, 3.5 and 4.0 mm, respectively. From Fig. 6a-c, it can be found that all samples exhibit good microwave absorption properties at a thickness of 2.0 mm. The RL values of bare NZFO are exceeding -10 dB in the whole band of 7 –11 GHz at the thickness of 2.0 mm (Fig. 9a). In the case of PANI/NZFO-1, the RL value in the frequency range from 2 to12 GHz almost exceeds 10 dB at the thickness of 2.0 mm, and the maximum RL reaches -27.8 dB (Fig. 9b). This value is much larger than that of pure NZFO (-11.8 dB) and reported materials (Ting, Yu et al. 2011). When the thickness of PANI/NZFO-1 increases to 3.0 mm, the absorption band moves to low frequency and it also covers the whole C-band (4.0–8.0 GHz), which is critically important for both commercial and military defensive purposes. However, it is noticeable that there are two microwave absorption bands over the whole frequency range for PANI/NZFO-2, in Fig. 9c, as the thickness of the absorbent increases from 2.0 to 5.0 mm. The maximum RL value of PANI/ NZFO-2 at around 5.9 GHz decreases and another new absorption band appears at 12.5 GHz. The influencing factors on the absorbing properties of the 1D PANI/NZFO hybrid nanostructure may include various defects in PANI/NZFO hybrid nanorods and dangling bonds on the interface of PANI and NZFO nanoparticles, which may be mainly due to the surface etch of the ferrite nanoparticals accompanied by the formation of numerous PANI chains. The dielectric polarizations arising from the defects in the PANI matrix, the interfaces and the grain boundaries between the ferrite and PANI matrix thus result in the enhancement of microwave absorption (Zhu, Bai et al. 2011). All these results suggest that the utilization of PANI/NZFO nanocomposites with rod shape, hybrid, and magnetism can be effective in microwave absorption enhancement (Liu, Che et al. 2012).
To study the relationship between the microwaves absorbing properties and the content of NZFO, the maximum RL values of the three samples are compared (Fig. 9d). The maximum RL value of pure NZFO is 11.8 dB in all the frequencies (curve 1). When NZFO nanoparticles are embedded in the PANI max with content 59%, the RL value of these NZFO/PANI-1 nanorods shows a dramatic increase (curve 2). The maximum RL value is –27.8 dB at 6.2GHz, and the absorption bandwidth with reflection loss below −10 dB is up to 8 GHz. With the NZFO contents decrease to 29 %, the maximum RL value of NZFO/PANI-2 dramatically decreased to 14.1dB (curve 3). The influence factors on the absorbing properties of the PANI/NZFO hybrid nanostructure also include different ratios of PANI/NiZn-ferrite that will lead to various intrinsic frequencies and induce different microwave absorption bandwidths for PANI/NZFO-2, PANI/NZFO-1 and the pure NZFO.
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请做吸波材料的高手帮忙修改论文中一段话
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wulishi8

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引用回帖:
6楼: Originally posted by wangcp1971 at 2013-07-31 09:51:34
如果你帮着修改,要多少金币?但是修改的要比原来好很多啊...

你看我还需要金币吗?呵呵。

[ 发自手机版 http://muchong.com/3g ]
中山大学材料学院招聘博士后和专职研究员,年薪20万起,请站内联系,谢谢。
7楼2013-07-31 13:53:20
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普通回帖

wangcp1971

金虫 (小有名气)

自己顶一下,怎么没人帮忙呢?100个金币不够吗?
2楼2013-07-17 15:12:11
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hong20070113

银虫 (小有名气)

吸波效果并不怎么样啊。发那个期刊啊
3楼2013-07-30 21:36:31
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hong20070113

银虫 (小有名气)

我觉得你要写出你这种材料与其他材料相比,它的最大优点是什么。
4楼2013-07-30 21:37:46
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wulishi8

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【答案】应助回帖

120个金币,给你修改至少一小时啊。。。看起来性能一般,没有到20dB。。。
中山大学材料学院招聘博士后和专职研究员,年薪20万起,请站内联系,谢谢。
5楼2013-07-30 23:24:44
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wangcp1971

金虫 (小有名气)

引用回帖:
5楼: Originally posted by wulishi8 at 2013-07-30 23:24:44
120个金币,给你修改至少一小时啊。。。看起来性能一般,没有到20dB。。。

如果你帮着修改,要多少金币?但是修改的要比原来好很多啊
6楼2013-07-31 09:51:34
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sky2013

金虫 (正式写手)

【答案】应助回帖

楼主是什么单位啊,你的吸波性能是从哪里测的,能不能分享一下!另外,自己也刚涉入吸波这个领域,加Q一起交流学习一下!
QQ:512081714
8楼2013-09-05 15:07:47
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huangzx1314

禁虫 (知名作家)

楼主通过复磁导率,复介电常数计算RL值是用什么软件算的?Excel吗?还是~~

我每次算的值都非常大,能不能把这个计算的软件或者Excel发我一份啊,非常感谢~~
9楼2013-10-04 10:50:18
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wangcp1971

金虫 (小有名气)

引用回帖:
9楼: Originally posted by huangzx1314 at 2013-10-04 10:50:18
楼主通过复磁导率,复介电常数计算RL值是用什么软件算的?Excel吗?还是~~

我每次算的值都非常大,能不能把这个计算的软件或者Excel发我一份啊,非常感谢~~

计算软件好像是用MATLAB 编的,我的数据时同学拟合后发给我的,我也不太会
10楼2013-10-07 18:08:59
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