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In this article, on the basis of the characteristics of the moire contour fringes of Nycticebus coucany, Macaca assamensis M'clelland, Presbytis phayrei, Phinopithecus roxellanae, Hylobates concolor leucogenys, Gorilla gorilla. Anthropopithecus troglodytes. Simia satyrus and modern human beings we divide the Primates into two types. The two types of the new classification may be two groups of the evolution moving state.For comparison with each other, the angle γ between the approximately elliptical major axis of the moiré contour fringes on the medial condyle and the horizontal plane is taken as the criterion. We suggest that the Primates evolution to the state of erect walking is the process of the angle γ evolution approaching 90°, regarding the γ of the moire contour fringes of the medial condyle as the evolution angle on the knees of the Primates. 相似文献
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Design of Double Cladding Nearly Zero Dispersion Flattened Nonlinear Photonic Crystal Fiber 下载免费PDF全文
We present a design of double cladding nearly zero dispersion flattened nonlinear photonic crystal fiber (PCF) with the core consisting of seven missing holes. The dispersion of the designed PCF fluctuates from -0.28 to 0.29 ps·km^-1·nm^-1 in the range of 1.35-1.795μm and the dispersion slope is -0.0038 ps·km^-1·nm^-2at 1.55μm. Due to its small air-hole to air-hole pitch in the inner cladding, the effective mode area is 6.48μm2 and the effective nonlinearity V is as high as 13.78 W^-1 km^-1 at 1.55μm. Two layers of air-hole rings in the outer cladding ensures the loss of the fundamental mode to be 2.9 dB/km at 1.55μm and two more air-hole rings can further reduce the fundamental mode's loss to the level of 4.2 ×10^-3 dB/km. 相似文献
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张人骧;鹿鸣;张鸿姿;兰祖云 《力学与实践》1981,3(2)
将生物力学的研究与人体检验相结合是一项值得重视的工作.利用 Moiré方法检验人体在文献[1,3]中曾进行过介绍.采用 Moiré法光学系统简单、操作容易、所用光源对人体无损害,它直接拍摄的照片可在病历中长期保存,是 相似文献
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关节的运动形式与关节面的形状直接有关,因此,有必要对动物骨关节面尤其是膝关节面进行专门研究。 本文报道采用Moiré等高线对猩猩科动物进行研究,初步提出了根据Moiré等高线的形状将猩猩科动物股骨膝关节面分为三类,并根据现有资料,以股骨膝关节面的外髁Moiré等高线为标志。由于实验所得第Ⅱ级以后的Moiré等高线族基本上具备一定规律,故以外髁上第Ⅱ级近似椭圆形Moiré等高线长轴与水平轴夹角α的分布为研究对象,给出了初步的分布示意图。所得结果可供生物力学及灵长类研究中的参考。 相似文献
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