The fourth part is temperature control system which ensure the pcr reaction performing accurately . after analysis of the experiment result and optimization of technics , we finally come up with relatively ideal technics situation and produce relatively ideal micro chamber , ni temperature sensors and ni / cr heaters , which can provide and test the temperature condition for pcr amplification 经过不断地分析实验结果，改进制作方法，最终探索出了较好的工艺条件，制备出了较理想的微型腔体、镍薄膜电阻温度传感器和镍铬合金薄膜电阻加热器，能提供和检测pcr扩增反应所需的温度，并实现了三温区的循环控制。
Due to the operating - temperature difference between the new material and traditional nb3sn and nb - ti , its characteristic cannot be easily expressed by a lineal function . for this new magnet , all the coefficients in the pde are complicatedly varied to ensure its accuracy . a protection circuit is designed according to its quench characteristic 由于新型材料的运行温区和传统的低温超导材料有很大差异，所以在计算过程中的材料特性不再能够用简单的线性表达式来计算，为了提高计算的精度，三维热传导方程的求解过程中各个系数都是非线性的。
From the scanning electron microscope ( sem ) images , the higher the heat treatment temperature is , the larger the grain size is . the magnetization of samples treated at 1273k is larger than that of samples treated at 1073k ; 3 . with the increasing of nife _ ( 2 ) o _ ( 4 ) contents , the resistivity of composite samples nd _ ( 0 . 67 ) sr _ ( 0 . 33 ) mno _ ( 3 ) / nife _ ( 2 ) o _ ( 4 ) is 1073k 值得注意的是，在这一温区中，这种复合样品的磁电阻是负的，即给样品加磁场后，样品的电阻率反而增大，与纯nd067sro33mno3样品的磁电阻性能恰好相反，其机制有待进一步研究; 4 .随着s :含量的减小， ( ndl一srxmno3 ) 。
The obtained polysilane - polyacrylate gradient films showed no macro - interface with the silicone content reducing gradually from the top surface to the bottom one . dma thermograms indicated that polysilane - polyacrylate gradient films contained two glass temperatures with their bands drifting from and their range extending much from each component . the good properties of waterproof , calorifics , and ultraviolet - absorption were also determined by dsc , uv and water contact angle measurements 结果表明：有机硅聚合物-聚甲基丙烯酸酯梯度膜有两个玻璃化转变温区，玻璃化转变范围相对组分材料的玻璃化转变范围发生了漂移和扩展；有机硅聚合物-聚甲基丙烯酸酯梯度膜具有较好的热学性能； pmts pmma体系梯度膜中硅含量的提高有利于改善膜层的憎水性能和紫外吸收性能。
When the content of nife _ ( 2 ) o _ ( 4 ) reaches to 30 % , the maximum mr value gets to - 6 % at the temperature from 310k to 340k , and the resistivity ranges from 1354 to 646 cm , where applied magnetic field is 1 . 8t . it is interesting that the mr value is negative which is different from that of the usual material ; 4 . with the decreasing of sr contents , the resistivity of composite samples ( nd _ ( 1 - x ) sr _ ( x ) mno _ ( 3 ) ) _ ( 0 . 7 ) / ( nife _ ( 2 ) o _ ( 4 ) ) _ ( 0 . 3 ) changes apparently , at the same time , the mr gets worse ; 5 3系列复合样品的电阻率显著变化，同时磁电阻性能逐渐变差; 5 .随着cu含量的增大，伽嘶67sr033mnl一uyo3 ) 07 /困ifezo4 ) 03系列复合样品的电阻率显著变化，同时磁电阻性能得到明显改善，当cu含量增大到y = 0 . 2时，样品磁电阻值在293k到317k较宽的温度范围内基本保持在一13 . 6 % ，随温度变化很小，由于该温区恰好在室温范围且温区宽，因而具有很好的潜在应用价值。
For the sample with the content of fe2o3 is 9 % , the maximum mr value of the composition ( lao9sroimno3 ) o9i ( fe2o3 ) oo9 increased in the negative direction , and get the maximum - 7 % at 337k ; with the content of feio increased , the mr of the composition increased also , when the content of fe2o3 is 17 % , the maximum mr value of the composition ( lao . gsro imno3 ) o . 83 ( feio o . n can reach - 30 % at 338k , where applied magnetic field is 1 . 5t 含量为9的样品，样品的磁电阻值在238k时随温度的升高而逐渐向负的方向增大，在337k时达到极值7 ；对于fe 。 oz含量为门的样品，样品的磁电阻值在265k时随温度的升高而逐渐增大，两种不同比例的复合体系都在很宽的温区内表现出较大的磁电阻，尤其后者，在1 st外场作用下， 338k时mr达到极值30 。
The minimum of resistivity at low temperature range can be explained by magnetic scattering which corresponds to the peak of magnetization . all of the experimental data can be well explained on the basis of vrh model , which comes from not the clusters , but the inhomogenous magnetic background . based on the mechanism of transport , cmr effect is elucidated 体系磁性和电性的影响，通过实验分析得出了下列结论： q ） dy对la的替代产生了无规的磁势，破坏了mn o mn长程铁磁序，导致在tn丁tc温区出现团簇玻璃态，在t tn温区，由于dy子大的磁矩， la （ dy亚晶格和mn亚晶格磁矩强烈的耦合，体系呈现反铁磁态
