基于TOA的无线传感器网络自定位技术的研究

提出一种基于TOA(tim e of arrival)测距、利用节点之间的几何关系实现传感器网络中未知节点自定位的算法.该方法计算量小、算法简单且定位精度高.仿真实验证明了该方法的有效性.*

N_(8161)和N_(8162)萃取铼的研究

（1）N_(8161)和N_(8162)对ReO_4~-的萃取及反萃取性能与正三辛胺相近，在一定酸浓度范围内萃取率可达95%以上。但在溶液中其它阴离子浓度较大时，对萃取ReO_4~-影响很大，其顺序为NO_3~- > Cl~- > HSO_4~-。（2）用边续变化法、斜率法、饱和容量法和元素分析的方法确定萃合物的组成为R_3 NHReO_4。（3）萃合物的IR和NMR光谱分析表明，萃合物以离子对的形式相互结合。其结构为（R_3 NH）~+(ReO_4)~-。（4）N_(8162)和它的萃合物有较好的热稳定性，它们均在100 ℃以上开始失重，300 ℃附近大量失重。（5）N_(8161)和N_(8162)萃取HReO_4的反应焓相近，而在25 ℃时，N_(8161)的浓度平衡常数比N_(8162)大一个数量级。它们萃取HCl、H_2SO_4、HNO_3、HReO_4的浓度平衡常数顺序为HReO_4 > NHO_3 > HCl > H_2SO_4。（6）N_(8161)、N_(8162)和TOA及其它们的萃合物界面研究表明，烷基的位阻越大，其吸附能力越小，饱合吸附量越小，相应的分子截面积越大，形成胶团能力越大。萃取过程的乳化能力与临介胺团浓度顺序相同N_(8161) > TOA > N_(8162)。（7）在N_(8162)萃合物浓度不变时，添加剂（辛醇）的lgC与r曲线有极大值。当辛醇浓度大于0.3时，萃合物对界面张力的影响被掩盖。在有添加剂存在时，萃合物在界面上的吸附量降低，临介胶团浓度增大。（8）通过对萃合物的量子化学计算，进一步的确定了萃合物的结构为（R_3NH）~(+0.998) (ReO_4)~(-0.998)。（9）通过本研究证明， N_(8161)和N_(8162)比较稳定，可以在工业上应用。

POLY(AZOMETHINE SULFONES) WITH THERMOTROPIC LIQUID-CRYSTALLINE BEHAVIOR

New poly(azomethine sulfones) with linear structures containing sulfonyl bis(4-phenoxyphenylene) and oxo bis(benzylideneaniline) or methylene bis(benzylideneaniline) units were prepared in the conventional literature manner by condensing the dialdehyde sulfone monomer (V) with diamines such as 4,4'-oxydianiline (IIIa) and 4,4'-methylenedianiline (IIIb), or by condensing an azomethine biphenol (IX) with 4,4'-sulfonyldichlorobenzene (II). Three model compounds which reproduced the above structures were also synthesized. The resulting polymers were confirmed by IR, H-1-NMP, and elemental analysis, and were characterized by inherent viscosities, thermogravimetric analysis (TGA), and x-ray diffraction. The thermotropic liquid crystalline (TLC) behavior was studied using polarization light microscopy (PLM), thermooptical analysis (TOA), and DSC. A nematic texture was observed only for 4,4'-oxydianiline-units-based polymers. The reaction of polymer VIIIb containing -CH2- links between the mesogens with the model compound IX led to polymer X which exhibited TLC behavior.

ARYLIDENE COPOLYETHER SULFONES .2. SYNTHESIS END CHARACTERIZATION OF SOME NEW COPOLYETHER SULFONES CONTAINING DIBENZYLIDENE CYCLOHEXANONE MOIETIES

New copolyether sulfones containing 2,6-bis(p-oxo-benzylidene)cyclohexanone and 2,6-bis(o,p-dioxo-benzylidene)cyclohexanone moieties were prepared in the conventional literature manner by condensing the dipotassium salts of 2,6-bis(p-hydroxybenzylidene)cyclohexanone (III), 2,6-bis(o,p-dihydroxybenzylidene)-cyclohexanone (V), and 2,2-bis(p-hydroxyphenyl)propane (Bisphenol A, VII) with 4,4'-dichlorodiphenyl sulfone (VI), or by condensing the dipotassium salts of III and VII with a new benzylidene cyclohexanone sulfone macromer (X). Finally, the polycondensation reaction of sulfonyl bis(p-benzaldehydeoxo-p-phenylene) (IX) with cyclohexanone leads to an unsaturated copolymer (XVI). The resulting copolyether sulfones were confirmed by IR, H-1-NMR, viscometry, elemental analysis, thermooptical (TOA), x-ray, and thermogravimetric (TGA) measurements.

ARYLIDENE COPOLYETHER SULFONES .1. SYNTHESIS AND CHARACTERIZATION OF SOME NEW COPOLYETHER SULFONES CONTAINING DIBENZYLIDENE CYCLOPENTANONE MOIETIES

New copolyether sulfones containing 2,5-bis(4-oxo-benzylidene)-cyclopentanone moieties were prepared in the conventional literature manner by condensing the dipotassium salts of 2,5-bis(4-hydroxybenzylidene)cyclopentanone (I) and 2,2-bis(4-hydroxyphenyl)propane (Bisphenol A, III) with 4,4'-dichlorodiphenyl sulfone (II), or by condensing the dipotassium salts of I with chlorine-terminated Bisphenol A-4,4'-dichlorodiphenylsulfone copolymers (V). The resulting copolyether sulfones were confirmed by IR, viscometry, DSC measurements, thermooptical analysis (TOA), and thermogravimetric analysis (TGA).