Aspects of modeling the frequency response of a two-port waveguide-coupled SAW resonator-filter

Coupling-of-modes-in-time and coupling-of-modes-in-space analyses are applied to the modeling of a two-port two-pole waveguide-coupled SAW resonator filter. Modeling is applied to a lumped equivalent circuit and a distributed circuit. While the accuracy of the coupling estimation dictates the exact mode-splitting and bandwidth, the ensuing computations can give a good representation of the amplitude and phase response, including the effect of degenerate transverse modes.     

Comparison of M. longissimus dorsi pigment concentration from implanted and control Angus and Limousin bulls and steers

M. longissimus dorsi total pigment concentration, visual color score and 24-h pH values were evaluated in a 2(3) factorial design that included bulls versus steers, Zeranol implants versus control and Angus versus Limousin comparisons. Bulls had greater total pigment concentration than steers (3.25 versus 2·90 mg/g; P < 0·01) and darker colored lean (P < 0·01). Twenty-four hour pH values did not differ between bulls and steers. Zeranol implanting and breed had no effect on total pigment concentration or visual color score; however, Limousin had higher (P < 0·05) 24-h pH values than Angus. The initial slaughter group (N = 10; average age = 256 days) had 34% less total pigment than the final slaughter group (N = 48; average age = 458 days). The correlation between visual color score and total pigment concentration was -0·65. These results indicate that the darker colored lean from bulls is due in part to an increase in pigment concentration.     

最新的铝熔炼静置炉

一、前言日本布拉依布里考公司于76年从美国F·W斜发公司铝炉厂引进了铝的熔炼静置炉,1号炉于78年建成。这台熔炼静置炉经过反复试验后于79年2月以名为布拉依安福开始销售。 F·W斜发公司根据铸造业的要求,而研制能满足以下三个条件的铝熔炼炉,条件是熔炼成本低、可获得高质量的铝熔体和不     

超低温LNG装置的管道设计

超低温ＬＮＧ装置的管道设计１前言由于天然气与其它化石燃料相比，排出废气中ＳＯｘ和ＮＯｘ等极少，有利于环境保护，因而随着全世界环境保护要求愈来愈严格，天然气逐渐成为城市用燃气和发电用燃料的主体，另外，在防止地球不断变暖，减少二氧化碳排出量等方面也引人注...     

硅酸盐化学成份快速测定仪及分析方法综述

本文对目前陶瓷原料化学分析方法作了综述。介绍了自行研制的以光度法为基础的硅酸盐化学成份快速测定仪，采用该方法可使硅酸盐八个元素的分析时间缩短到２小时。     

我国的能源形势与煤气化

从哺乳期开始建立大鼠缺锌和高锌模型，应用流式细胞术研究微量元素锌对胸腺、脾脏淋巴细胞增殖功能的影响。结果表明：ＺＤ组和ＺＥ组胸腺、脾脏静止期细胞明显增高，而增殖期期细胞及增殖指数量降低。与自由喂养组及配对组相比差别非常显著。     

电动潜油泵最新技术综述

近年来，美国WooD Groop等公司对于电动潜油泵的井下作业或地面系统的新技术进行了开发。现就其中8项主要技术进行简要介绍。