On the method-independent lower bound (MILB) to the variance of attenuation estimation in random reflection

Based on the Cramer-Rao inequality, the MILB is calculated for the problem of estimating the frequency slope of the attenuation coefficient of tissue from random reflections of ultrasonic waves. Under typical signal conditions, this bound for a 1-cm x 1-cm region was found to be about 0.08 db/(MHz-cm), rather close to the clinical requirement of 0.1 dB/(MHz-cm). Comparison to existing methods (including an autoregressive deconvolution method) shows room for further improvement.     

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.     

皖江澜溪老街地域景观特征与传承研究

皖江历史街区作为长江沿线地域景观风貌的有机组成部分,不仅展现了沿江城镇居民的日常交互过程,更是一个记载流域内自然风貌与传统文化演变的重要空间载体.本文以铜陵大通古镇澜溪老街为例,通过实地调研与类型化归类,从宏观、中观、微观三个层面出发,系统阐释街区物质要素与非物质要素构成的框架体系,分析其地域景观特征的生成环境、类别以及表现形式,从而为澜溪老街景观风貌传承与延续的策略方法及路径提供支撑,以期推动同地域类型老街的历史记忆活化进程,打造街区地方文化的动态传承模式.     

台风灾害下配电系统受损评估研究

台风灾害会造成配电系统多个元件同时故障而导致大面积用户停电。为研究台风灾害对于配电系统的破坏影响,提出台风灾害下配电系统受损情况评估方法。为描述台风特征对元件故障概率的影响,基于台风影响历史数据,使用随机森林算法建立元件脆弱性曲线。在元件模型建立后,使用时序蒙特卡洛模拟法评估配电系统的实时和累计电量及用户损失。为提升评估效率,引入故障模式后果分析法,使用最小路法生成故障影响报表,更快地确定失电负荷节点。最后通过RBTS-BUS6测试系统和广州地区的实际系统进行算例分析,验证了所提算法的有效性。结果表明：台风对配电网的影响具有延时性,配电系统受损情况与元件维修时间和维修资源数量相关。     

通用电子手册数据库录入软件的关键技术

文章主要讨论了关于通用电子手册数据库录入软件的组成和功能,较为详细地讨论了实际开发中几个关键技术的解决方案.实际设计完成了通用电子手册数据库录入软件模块,并应用于实际工作中,运行良好.     

邻氨基苯磺酸生产装置技术改造

通过改进生产工艺与设备,提高了装置生产能力和产品质量指标,达到了降本增效的目的。