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应用蚕豆根尖细胞微核技术对梯田式人工湿地出水进行致突变性研究,测定了生活污水、梯田式人工湿地出水、常规垂直流人工湿地出水及自来水的蚕豆根尖细胞微核千分率(MCN‰)及污染指数(PI),并对各水样的MCN‰进行了舱验.结果表明:梯田式人工湿地出水的致突变性(MCN%。为1.8‰)与生活污水(MCN‰为10.2‰)有显著差异,低于常规垂直流人工湿地(MCN‰为3.2‰),与自来水无明显差异(MCN‰为1.6‰),出水无致突变性,具有安全性. 相似文献
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We report a feasible approach to the preparation of monodispersed metal-shell composite microspheres based on a combination of surface reaction and surface seeding techniques. The method was implemented for coating polystyrene (PS) spheres with silver shell having a variable thickness by controlling the amount of reagents in the reaction procedure. These composite spherical particles in dimensions of the submicrometer range may become attractive building blocks for the creation of metallo-dielectric photonic band gap materials when they are organized into crystals. 相似文献
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Herein,we propose a high-quality(Q) factor hybrid plasmonic nanocavity based on distributed Bragg reflectors(DBRs) with low propagation loss and extremely strong mode confinement.This hybrid plasmonic nanocavity is composed of a high-index cylindrical nanowire separated from a metal surface possessing shallow DBRs gratings by a sufficiently thin low-index dielectric layer.The hybrid plasmonic nanocavity possesses advantages such as a high Purcell factor(Fp) of up to nearly 20000 and a gain threshold approaching 266 cm~(-1)at 1550 nm,promising a greater potential in deep sub-wavelength lasing applications. 相似文献
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针对AS5643总线传输等时数据包时所带来的不确定性问题,提出一种将总线周期分为等时和异步两部分时隙的优化传输方法,能在不影响确定性的前提下引入等时数据包传输。首先对引起不确定性问题的原因进行了分析,然后详细介绍了优化传输方法的原理及工程实现。该优化传输方法经实验证明是正确可行的,可应用于高度综合化的航空电子系统中。 相似文献
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目的分析髋部骨折治疗效果,探究其影响因素。方法选取2014年4月至2015年9月期间珠海市人民医院收治的82例髋骨骨折患者的临床资料进行回顾性分析,将其分为手术组(n=65)和非手术组(n=17),观察两组患者的治疗效果,探究其影响因素。结果非手术组患者的优良率为70.6%,手术组患者的优良率为96.9%,两组患者的优良率比较差异有统计学意义(P0.05),对本次研究中患者的年龄、性别、骨折类型、抗骨折疏松治疗等相关因素进行分析,除了性别因素外,患者的年龄、骨折类型、抗骨折疏松治疗等因素均影响治疗效果。结论手术治疗髋部骨折治疗效果明显,治疗效果与患者的年龄、骨折类型、抗骨折疏松治疗等因素均有明显的关系。 相似文献
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An Array of One-Dimensional Porous Silicon Photonic Crystal Reflector Islands for a Far-Infrared Image Detector 下载免费PDF全文
With the aid of photolithography, an array of one-dimensional porous silicon photonic crystai reflector islands for a far infrared image detector ranging from 10 μm to 14 μm is successfully fabricated. Silicon nitride formed by low pressure chemical vapor deposition (LPCVD) was used as the masking layer for the island array formation. After etching, the microstructures were examined by a scanning electron microscope and the optical properties were studied by Fourier transform infrared spectroscopy, the result indicates that the multilayer structure could be obtained in the perpendicular direction via periodically alternative etching current in each pre-pattern. At the same time, the island array has a well-proportioned lateral etching effect, which is very useful for the thermal isolation in lateral orientation of the application in devices. It is concluded that regardless of the absorption of the deposition layer on the substrate, the localized photonic crystalline islands have higher reflectivity. The designed islands structure not only prevents the cracking of the porous silicon layers but is also useful for the application in the cold part for the sensor devices and the iliterconnection of each pixel. 相似文献
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