There are over3,500species of mosquito throughout the world.But it is only the female of the species which bites as she searches out nourishment for her eggs. M
1病例资料男,44岁,体重83 kg.术前诊断:慢性胆囊炎,胆囊结石.一般情况尚好,各项辅助检查基本正常,拟在硬膜外麻醉下行胆囊切除术.进手术室后血压130/90 mmHg,呼吸20/min,脉搏
研究表明，不同沉积环境湖相的低熟原油芳烃生物标志物分布具有较大的差异。淡水湖相低熟原油芳烃以萘和菲系列化合物为主要组份、膏岩盐湖相低熟原油芳烃以脱羟基维生素Ｅ和三芳
A test of the adding up condition in demand systems is crucial for determining whether a share format is admissible when the number of sample goods is smaller t
目的：探讨老年骨质疏松椎体压缩性骨折患者行经皮穿刺球囊扩张椎体成形术围术期的护理方法。方法：对50例老年骨质疏松椎体压缩性骨折患者于c型臂x线机透视引导下行经皮穿刺球囊
The purpose of this study was to demonstrate an application of Rasch analysis to identify differences in disability profiles resulting from traumatic brain inju
Empirical mode decomposition (EMD) and BP_AdaBoost neural network are used in this paper to model the oil price. Based on the benefits of these two methods, we
研究背景：烟草使用已成为当今世界最严重的公共卫生卫生问题之一，是人类健康所面临的最大可预防的危险因素之一。世界控烟运动已取得重大进步，2005年2月27日《烟草控制框架公约
Crossover designs are well-known to have major advantages when comparing the effects of various non-curative treatments. We compare efficiencies of several cros
作为现代厨房革命的代表,电磁炉具有无明火、热效率高、安全环保、易清洁等特点,因此备受消费者青睐。电磁炉工作时不可避免会产生电磁振动,进而产生较大的噪声,从而影响用户使用舒适度。本文以电磁炉为研究对象,分析电磁噪声的产生机理,研究电磁振动噪声的多场耦合仿真方法,提出降低电磁噪声的改进方案,以期为电磁炉设计及优化提供理论依据。论文具体研究内容如下:(1)电磁炉电磁场及电磁力分析。由电磁炉基本工作原理可