Optical tomography of biological tissue has become an active research field because of the advantages of noninvasive , sensitive and functional imaging for biomedical diagnosis . it is very helpful to find cancerous tumor of parenchyma organs in the initial stage , but the biological tissue is optically turbid and a strong scattering media , which results in a limited penetration depth of several millimeters with high resolution 光学相干层析技术，作为一种新型的无损医学成像检测方法，其探测精度高，而且有可能实现功能成像，对于癌变组织的早期发现和诊断具有重要的意义，但受目前技术的局限性，还不能完全满足临床应用的要求。
A preliminary analysis of the suction penetration mechanism is made , the influence of negative pressure on the penetration resistance and soil character are studied in conbination with the cb20b platform field test data , and the relationship between negative pressure , penetration depth and penetration speed are summarized 对负压沉贯的机理进行了初步分析，结合cb20b桶形基础计量平台的现场测试数据，研究了负压对桶形基础沉贯阻力的影响及对土壤特性的影响，同时对负压、沉贯深度、沉贯速度之间的关系进行了总结。
2 . after analyzing the penetrating process of earth penetrating weapon , we described a new multifunctional adaptive fuze algorithm in order to improve the performance of fuze system , by combining the “ calculating of penetration depth ” and “ target medium identification ” which were the more advanced fuse algorithms 2 .通过钻地武器侵彻过程分析,对现今国内外的较先进的“侵深计算”同“目标介质识别”两种算法进行融合改进,设计一种多功能自适应引信算法,以提高引信系统性能。
The strict solution of the eddy current distribution inside a conductor cylindrical boundary surface for quasi - state - state is obtained by derivation of maxwell ’ s equations ; meanwhile , the approximate solution of the eddy current and electromagnetic field in the condition of the low - frequency or the high - frequency are obtained . furthermore the penetration depth of the skin effect is achieved 五、讨论了似稳条件下导体圆柱面内的涡电流分布的规律。我们采用圆柱界面条件下获得的趋肤效应的穿透深度与采用平面条件下获得的趋肤效应的穿透深度相一致,我们的研究可视为对传统教材相关论述的有益补充。
The investigation of a lot of parameters about treated sandstone , brick materials and earthen materials with fluorited polymers has been carried out , such as the formation of polymer , the penetration depth , porosity , capillary absorption and penetration coefficient , water uptake , compressive strength , drilling resistance , absorption isotherms of water vapor , water vapor diffusion , color changes as well as resistance to desegregation of water , frizzing - throwing cycles , worming - cooling cycles , and so on . in addition , the influence of salt crystallization , acid and base , and uv aging have also been assessed in order to better understand the protection effects and utilization possibility of two fluorinated polymers , mainly according to astm standard and the combination of international methods together with general technological 分别以国家级文物保护单位的土质、砂岩和砖材文物样品为对象，依据astm标准及国际通用文物保护研究方法与评估准则相结合，通过胶化物形成周期、渗透深度、孔隙度、毛细吸水和渗透系数、持水量、抗压强度、抗钻强度、吸附水蒸气的能力、透气性、外观颜色等系列参数的测定，及冻融、冷热循环、酸碱腐蚀后抗压强度的衰减、可溶盐对保护效果的影响、酸碱及光照对表面保护效果的影响，对两种含氟聚合物及其与有机硅的共混物在文物加固保护和表面防护中的可行性和保护效果给予了系统研究。
Based on that penetration depth of eddy current is theoretically different for different operationalfrequency , the flaw depth quantitive measurement method based on the characteristicalfrequency was expounded . to find the best testing model and position , it analysed and discussedthe factors which effected measurement . the mathematic relationship between the specialfrequencyand flaw depth was established to realize the accureate measurement of flaw depth . it primarily researched the technology of alternating current magnetic field leakage testing ( ac - mfl ) in our country 在利用频率扫描技术的基础上,提出了基于拐点频率的涡流检测缺陷深度测量方法,对影响测量的多种因素进行了分析和实验研究,得到了最佳的测试位置和测试方法,建立了拐点频率和缺陷深度的定量关系,为深度的测量提供了新的途径。
