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Then can weld starting the resistance directly on the rotor winding, and cancel collecting the electric ring and electric brush.

将定子一种极数的磁场感应于转子绕组中的电流,通过集电环和电刷,但由另一种极数的磁场感应的电流,却自动流经另一闭合回路,而不通过集电环和电刷:于是,如果后一种极数是电动机的工作基波磁场,而把前一种极数作为用以起动的谐波磁场,则可以把起动电阻直接焊接在转子绕组上,而把集电环和电刷取消,从而出现了转子电路上无集电环、无电刷、无触点的谐波起动绕线型感应电动机。

The dissipation factor tip-up D tan d , the change of capacitance D C / C 0, the maximum discharge q max and the mean discharge magnitude q mean , A compared investigation of the correlations between V min , V av and service time were compared with those between D tan d , D C / C 0, q max, q mean and respectively.

对大量的不同运行年数的线棒进行了超声波 V min 和 V av 测量,以及介质损耗角增量 D tan d 、电容变化率 D C / C 0、最大放电量 q max 和平均放电量 q mean 等电气测量试验,对比研究了超声参数( V min 和 V av )和电气测量参数( D tan d 、 D C / C 0、 q max 和 q mean )与运行年数的相关性,发现, V min 和 V av 与的相关性很强,相关系数 R 分别为0.892和0.890,而 D tan d 、 q max 和 q mean 与的相关性较弱, R 在0.55~0.60范围内, D C / C 0与几乎没有相关性, R 仅为0.310;采用线性回归分析,分别建立了 V min 和 V av 与的二阶和三阶线性函数的数学模型, R-S 分别为0.828和0.903,并分别提出了最可靠运行年数和置信度为95%的可靠运行年数的预测方法。

After it is proved that the fractal dimensions are stable characteristic parameters of images, and there is correlation between them in undeformed and deformed states, the fractal correlation function are found for displacement measurement, which the correlation parameters are Box Dimensions.

在确定了变形前后数字散斑图像的分形维数之间具有相关性,而且其分形维数是稳定的特征参数之后,以图像的盒维数为相关参数进行互相关运算而形成分形相关函数。即利用变形前后数字散斑图像的分形维数序列做为相关参数进行相关运算,实现位移测量。

Result of thermogravity analysis showed that the thermal stability of polyvinylamine chloride lowers with increasing in amination degree. Moreover, properties of dilute aqueous solutions of three types of poly chloride with different amination degree were compared by use of viscosimetric, conductometric, and potentiometric measurements. Results showed that both the electrostatic interaction of neighboring groups on the chain and the reduced viscosity of poly chloride are increased with increasing the degree of amination of poly . The equivalent conductivity is decreased with the increasing the concentration of poly chloride and increased with the increasing the amination degree of poly .

研究了聚乙烯胺盐酸盐的热稳定性和水溶液性质,发现:随着胺化度的提高,聚乙烯胺盐酸盐的对热稳定性逐步降低;聚乙烯胺盐酸盐是一种典型的聚电解质,其水溶液的pH值随平均分子量的变化并不明显,而随着聚乙烯胺胺化度的升高,pH值降低;随着聚乙烯胺盐酸盐的平均聚合度由82.3增加到201.8,它的m值(用于表征聚电解质侧链基团之间相互作用大小的常数)从5.13升高到5.58,而当聚乙烯胺盐酸盐的平均聚合度增加到311.4时,它的m值反而降低到了5.48;随着胺化度由55.65%升高到82.36%,m值由3.65提高到5.50;随着聚乙烯胺盐酸盐的平均聚合度的提高,聚乙烯胺盐酸盐的平均解离常数由7.48降低到7.26,同时随着胺化度的提高,聚乙烯胺盐酸盐的平均解离常数也由8.33降低到7.37;随着聚乙烯胺盐酸盐浓度的提高,溶液的摩尔电导率逐步降低,随着聚乙烯胺胺化度和聚合度的提高,溶液的摩尔电导率有所升高;在pH值为4左右时,聚乙烯胺盐酸盐的比浓粘度分别达到极值,而与聚合度的大小关系不大;聚乙烯胺盐酸盐的特性粘数明显高于其原料聚丙烯酰胺的特性粘数,分子量对特性粘数的影响十分明显,胺化度对特性粘数的影响并不显著。

During the early growth stage of seedlings, basal stem diameter and paripinnate number were decreased with the increasing of shade, taproot length, root : shoot ratio, total dry weight and leaf area per seedling were maximal under 37.3% NS, specific leaf area was increased with the increasing of shade, but the relative growth rate was declined. Seedlings grew fastest under 0.6% NS, suggesting that nutrients stored in seeds played an important role at the early growth stage. The treatment of 37.3% NS was best for established seedlings in seedling height, basal stem diameter, paripinnate number, rachis length, the maximum sub-leaflet number of individual paripinnate, leaf area per seedling, relative growth rate and net assimilation rate. Light intensity was positively correlated to total dry weight, and negatively to specific leaf area. The maximum of SLA was observed under 15.5% NS.

生长早期的幼苗基径和复叶数随遮荫程度的增加而降低;主根长、根冠比、总干重和单株叶面积均以37.3% NS处理最大;比叶面积随遮荫程度的增加而增大,而相对生长率则降低;幼苗株高在0.6% NS下增长最快,表明种子中贮藏的营养物质对幼苗的早期生长可能具有重要作用。37.3% NS处理对定居后绒毛番龙眼幼苗的生长最有利,幼苗的株高、基径、复叶数、叶轴长、复叶最多小叶数、单株叶面积、相对生长率和净同化率均在37.3% NS处理下获得最大增长;幼苗总干重随光照强度的减弱而降低;比叶面积在15.5% NS处理时最大。

The treatment of 37.3% NS was best for established seedlings in seedling height, basal stem diameter, paripinnate number, rachis length, the maximum sub-leaflet number of individual paripinnate, leaf area per seedling, relative growth rate and net assimilation rate.

生长早期的幼苗基径和复叶数随遮荫程度的增加而降低;主根长、根冠比、总干重和单株叶面积均以37.3%NS处理最大;比叶面积随遮荫程度的增加而增大,而相对生长率则降低;幼苗株高在0.6%NS下增长最快,表明种子中贮藏的营养物质对幼苗的早期生长可能具有重要作用。37.3%NS处理对定居后绒毛番龙眼幼苗的生长最有利,幼苗的株高、基径、复叶数、叶轴长、复叶最多小叶数、单株叶面积、相对生长率和净同化率均在37.3%NS处理下获得最大增长;幼苗总干重随光照强度的减弱而降低;比叶面积在15.5%NS处理时最大。

The periostea of both experimental and control side of the mandibular ramus were taken and prepared, 2 of each 5 rabbits in a group were prepared for HE stain detection and 3 for proliferating cell nuclear antigen immunohistochemical detection.Results:1, The newly formed bone was detected on the lateral aspect of mandibular ramus after periosteal distraction. The bone was shaped like a hill. It looked very low and was full of holes at postoperative day 28. With the time of consolidation period lengthened, the newly formed bone matured gradually. X-ray examination showed the new bone shaped like a hill. The average values of new bone height at postoperative days 28,35,42 and 56 were 1.86 + 0.15mm, 2.29 + 0.29mm,3.19 + 0.13mm and 4.70 + 0.45mm. Histological examination of both HE stain and picricacid-fuchsin stain showed the increase in the number of osteoblasts and the change in the orientation of collagen fibers and bone trabecula. There were no significant differences between newly formed bone and original bone on the lateral aspect of mandibular ramus at postoperative day 56 histologically.2 Compared with the control side, the distracted periostea proliferated obviously under the microscope, and the number of periostealcells increased with satiation of cellular nuclear per unit area. The images of PCNA immunohistochemical stain of periosteum showed that the experimental periosteum proliferated obviously after distraction compared with the control side.

结果:骨膜牵张成骨的实验研究南京医科大学硕{学位论文l、骨膜牵张后,可见下领升支外侧的骨皮质上有新骨形成,新骨呈山峰状凸起,术后第28天的新生骨较低平,多孔隙,随着固定时间的延长,新骨逐渐成熟;下领升支前后向切线位X线投照显示新骨呈山峰样隆起;经测量,术后第28、35、42和56天组平均新生骨厚度分别为x.86士0.15mm、2.29士0.29mm、3.19士0.13mm和4.70 土0.45mm;脱钙骨组织的HE染色和不脱钙骨组织的苦味酸一品红染色的组织学观察均显示了新生骨在成骨细胞数量上的增长,以及胶原纤维和骨小梁排列方向上的变化,术后第56天的新生骨在组织学上与原升支骨组织已无明显区别。2、HE染色显示,与对照组相比较,实验侧骨膜增生明显,细胞间排列紧密,单位面积内骨膜细胞数增多,细胞核饱满;骨膜PCNA 免疫组化染色显示,与对照侧相比较,实验侧骨膜在牵张后出现了明显的增生迹象,PCNA阳性细胞分布紧密,单位面积内阳性细胞数较对照组多,靠近骨表面的骨膜中的阳性细胞数更多而且分布更为紧密。

In GABA group,the degeneration and necroses of hippocampus neurons were relatively alleviated.The positive expression of CX43 mRNA was few in control group and surgery group.And in KA group it increased with time.In GABA group,the positive expression of CX43 mRNA was fewer than that of KA group at every period.

CX43表达阳性细胞数定量分析显示,正常及手术对照组CX43表达阳性细胞数较少,KA对照组随时间延长CX43阳性表达细胞数逐渐增多, GABA受体基因转染组大鼠CX43阳性表达细胞数在各个时程均比KA对照组减少。

In the paper, we investigate, respectively, the unsteady transport properties of heat and moisture in enclosure under constant wall heat flux and constant wall temperature when porous particles are small and Darcy number is lower, the effect of conductivity ratio, heating conditions and other parameters on the heat transfer rate of enclosure when particles are larger and Darcy number are higher.

并分别对多孔颗粒较小时的低Da数封闭腔内的非饱和渗流与传热,及颗粒较大的高Da数封闭腔内的非饱和自然对流行为进行了数值模拟,研究了低Da数时湿分与热量在恒热流与恒壁温条件下的非稳态传递特性,高Da数时封闭腔的传热与流动特性、达西效应以及导热比、加热条件等对空腔传热系数的影响。

Experimental results indicate that the B/A value greatly affects the internal Nusselt number and friction factor of the twisted tube because the parameters decrease with the increase of B/A and S/d values, more rapidly with the former, and that the Nusselt number and friction factor of the twisted oblate tube increase respectively by 30%~150% and 20%~50%, as compared with those of the smooth tube at the same Reynolds number and Prandtl number.

实验结果表明:高扭曲比螺旋扁管的管内努塞尔数和阻力系数均随B/A值和S/d值的增大而减小,但随B/A值的增加而减小得更快,B/A值对高扭曲比螺旋扁管的管内传热与流阻性能影响更大;在相同雷诺数和普朗特数下,高扭曲比螺旋扁管管内的努塞尔数为光滑管的1.3~2.5倍;阻力系数为光滑管的1.2~1.5倍。

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