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一、前言皮肤纹式学(皮肤沟纹学)(皮肤纹理学)认为:分布在手指上的图纹称指纹。指纹可分为三大类:(一)弓形纹(Arch)简称A;(二)箕形纹(Loop)简称L,其中又分为;尺侧箕形纹,简称U,桡侧箕形纹,简称R;(三)斗形纹(Whorl)简称W,其中又分为环形纹,螺形纹,偏形纹(双箕纹)等。这些图形在胚胎13周开始发育,19周完成;完成后,终生不变(世界上仍未发现两个完全相同的指纹)。我国从广代(公元618年)开始,直至今天仍利用指纹作为个人识别的方法;在单据、契约上仍缘用按指纹作为凭证。
First, the foreword Skin style (skin grooveology) (skin texture) that: distributed in the finger pattern called fingerprint. Fingerprints can be divided into three categories: (a) arch referred to as A; (b) Kei shape (Loop) referred to as L, which is divided into; foot side Kevlar pattern, referred to as U, radial Kei pattern, referred to as R ; (3) Whorl W, which is divided into annular pattern, spiral pattern, partial pattern (double Keiwen) and so on. These patterns begin to develop at embryonic week 13 and are completed at 19 weeks; they remain unchanged for the rest of their life (two identical fingerprints have not been found in the world yet). From the beginning of the Guang dynasty (618), our country still uses fingerprints as a means of personal identification. Fingerprints are still used as vouchers in documents and contracts.