网络承载方式对彩铃复制的影响

分析了移动网络承载方式的变更和彩铃响应时延对彩铃复制业务量的影响,并分析其原因及原理。     

多项式函数在无理点的函数值

在高等数学的教学过程中,经常会遇到求多项式函数在无理点的函数值这类问题.如果这个无理点仅仅是2~(1/2),3~(1/2)之类,往往还是很容易解决的.但是遇到象2±(13)~(1/2)3这类无理点时,如果采用直接把无理数带入多项式来求多项式函数的值,那么这项工作会很复杂且容易出差错.本文给出一个十分有效的解决此类问题的方法,可以把这一类的求值问题转化为一次多项式函数的求值问题,从而大大降低了求解此类问题的难度.     

肿瘤光动力治疗临床应用的光敏剂及其研究概况

光动力治疗是一种非侵蚀性并具有一定靶向性的肿瘤治疗新方法。 光动力治疗需要光敏剂、光和氧结合产生光动力反应。 光敏剂是光动力治疗的关键和物质基础。 本文概括介绍了已上市的和已被批准进入临床试验中的光敏剂,并根据其分子的骨架结构,将其分为分卟啉类、二氢卟吩（叶绿素）类和菌绿素/酞菁三类。 同时从理想光敏剂应具备特点出发,探讨了研究中的光敏剂和光动力治疗的发展前景。     

Model of bidirectional reflectance distribution function for metallic materials

Based on the three-component assumption that the reflection is divided into specular reflection,directional diffuse reflection,and ideal diffuse reflection,a bidirectional reflectance distribution function(BRDF) model of metallic materials is presented.Compared with the two-component assumption that the reflection is composed of specular reflection and diffuse reflection,the three-component assumption divides the diffuse reflection into directional diffuse and ideal diffuse reflection.This model effectively resolves the problem that constant diffuse reflection leads to considerable error for metallic materials.Simulation and measurement results validate that this three-component BRDF model can improve the modeling accuracy significantly and describe the reflection properties in the hemisphere space precisely for the metallic materials.     

采用 Multisim 辅助数字电子技术课程教学实践

引入Multisim仿真软件到数字电子技术课堂教学、实验教学和课程设计中,有效地改善传统教学过程,优化教学资源,降低教学成本,提高教学效率。同时能培养学生的自学能力和解决问题的能力,提高学生的综合素质。     

Degree of polarization based on the three-component pBRDF model for metallic materials

An expression of degree of polarization(DOP) for metallic material is presented based on the three-component polarized bidirectional reflectance distribution function(p BRDF) model with considering specular reflection, directional diffuse reflection and ideal diffuse reflection. The three-component p BRDF model with a detailed reflection assumption is validated by comparing simulations with measurements. The DOP expression presented in this paper is related to surface roughness, which makes it more reasonable in physics. Test results for two metallic samples show that the DOP based on the three-component p BRDF model accords well with the measurement and the error of existing DOP expression is significantly reduced by introducing the diffuse reflection. It indicates that our DOP expression describes the polarized reflection properties of metallic surfaces more accurately.     

质量检验工作的管理与控制

本文简单介绍质量检验的定义、职能和分类,重点阐述如何管理和控制质量检验工作,以确保其有效性.     

混合碱媒介法制备磁性铁酸钴纳米粉体

采用混合碱媒介法制备铁酸钴磁性纳米粉体,探索了制备工艺,利用X射线衍射仪、透射电镜、振动样品磁强计对样品的结构和磁性能进行了研究.结果表明:以硝酸盐或醋酸盐为原料用混合碱法可制得粒度均匀、粒径范围在10～50 nm的铁酸钴纳米粉,所制备的样品具有粒径小、粒度均匀、分散性较好的特点,中等饱和磁化强度、高矫顽力,是性能优良的磁性材料.     

多媒体短消息业务及其实现

多媒体短消息业务是由3GPP和WAP论坛制定的一种手机消息业务。本文就目前比较流行的多媒体短消息业务的体系结构做了分析,并通过包的交互过程阐述了多媒体短消息业务的基本原理及其实现过程,最后简单介绍了MMS数据的实现语言———SMIL。     

极坐标激光直写技术制作微结构

简述了极坐标激光直写技术原理,并利用该技术研究了在铬板、光刻胶版表面制作微 结构的工艺,制作了光栅、非涅耳透镜、曲面衍射透镜、平面连续微结构衍射透镜掩模以及基于MEMS技术的微型太阳敏感器光学掩模。