双蝶形高速脉冲压缩的FPGA实现

在对脉冲压缩原理分析的基础上提出了适应于FPGA实现的结构,采用了数据全并行基4双蝶形单元计算结构,极大地提高了蝶形运算的并行度,从而提高了脉冲压缩的速度.设计了合理的数据流程,以较小代价实现了和差两路数据的脉冲压缩.根据二相码的特点采用了奇偶点分开并行脉冲压缩方法保证了脉压的效果和速度.在系统时钟100 MHz时,完成4 K点的脉冲压缩只需67 μs.     

S广义ω－凸语言

本文通过在Σω上定义半序关系“≤ωｓ，引进了Ｓ广义ω－左凸语言、Ｓ广义ω－右凸语言和Ｓ厂义ω－凸语言的概念，并给出了各类Ｓ广义ω－凸语言与其前缀语言之间的关系；还给出了各类Ｓ厂义ω－凸语言族对布尔运算的封闭性以及各类Ｓ广义ω－凸语言的充分必要条件。     

掺钛蓝宝石激光晶体中夹杂物的分析

本文用大视场光学显微镜、电子探针观察和分析了掺钛蓝宝石激光晶体中夹杂物的形状、尺寸大小及元素组成，并提出消除和减少这些夹杂物的方法．     

以YAG为添加剂的气压烧结氮化硅

本文以添加ＹＡＧ的反应烧结氮化硅（ＲＢＳＮ）为前驱体，采用气氛加压烧结的工艺，在０．５～９．０ＭＰａ氮气压力范围，研究了不同氮压对烧结体的密度、相组成、强度和显微结构的影响及其相互间的关系。研究表明，通过改变氮气压力能有效地调控材料的显微结构，材料的性能又受控于显微结构的变化。     

论冶金企业节能管理员的技术要求

本文围绕冶金企业节能管理的工作内容和要求，论述了企业节能员应掌握的技术和提高技术途径。     

美国UCC公司项目实施八段法

国外工程公司的项目实施工作法是科技发展和经济发展的产物。公司为谋求生存和发展,必须采取先进的技术和科学管理,同时获得适当的利润回报。本文介绍美国UCC公司的项目工作八段法。     

Role of hepatic resection in surgery for bilateral intrahepatic stones

The effect of phenylephrine-induced reflex parasympathetic stimulation on QT interval and its dispersion was studied in 16 healthy subjects with a history of paroxysmal supraventricular tachycardia, both during sinus rhythm and during atrial pacing. Results demonstrate that rapid reflex parasympathetic stimulation does not influence QT interval duration or QT dispersion, and also emphasize the inappropriateness of Bazett's formula, the need for comparison of QT intervals during identical heart rates, and the importance of analyzing all 12 leads of a standard electrocardiogram when assessing the effects of various interventions on the QT interval.     

Oxygen absorption kinetics in YBa2Cu3Ox

The oxygen absorption process in highly aligned YBa₂Cu₃O_x samples in air and in pure oxygen was studied at several constant temperatures. The process can be expressed in two steps, a chemical reaction controlled step and a diffusion controlled step. The kinetic equations are as follows respectively:

(1 − a_t) ln(1 − a_t) + a_t = k_Dt

The activation energy was calculated using an Arrhenius equation. The technical conditions of heat treatment for oxygen absorption of highly aligned YBa₂Cu₃O_x crystals are discussed.     

Vector algorithm for Reed-Muller expansions

A novel vector algorithm for Reed-Muller (RM) expansions is proposed which can save as many as a factor of 2^n-1 memory elements compared with previous matrix algorithms     

80m高钢筋砼烟囱的爆破拆除

论述了控制爆破拆除钢筋砼烟囱的方案设计与力学计算、爆破参数确定、施工方法、安全防护措施、震动监测和爆破效果.