集成运算放大器的非线性宏模型(英文)

本文提出了两个分别适用于时域和频域分析与设计的运放宏模型。我们考虑了在不同大小的信号激励下,运放所呈现的线性和非线性响应,证明了运放在线性与非线性工作状态之间没有明显的界线;推导出了输入级电流饱和特性在频域中的非线性曲线及解析表达式;在摆率模拟中,揭示了其物理本质。     

Z（2）规范场—Higgs场和Z（4）规范场：Z（2）Higgs场系统…

应用累积展开方法，我们解析地计算了格点Ｚ（２）规范场－Ｈｉｇｇｓ场和Ｚ（４）规范场－Ｈｉｇｇｓ场定模耦合系统的相结构，这一计算分别精确到累积展开的第四级和第三级，所得结果和ＭｏｎｔｅＣａｒｌｏ结果相一致。     

Ultra-Cut biopsy guided by ultrasonography for liver lesions：experience of 392 clinical cases

We conducted a retrospective study of the accuracy of liver biopsies in 392 patients with liver lesions. Postbiopsy diagnosis was 297 cases of primary liver cancers, 79 cases of secondary malignant tumors, 2 cases of non-Hodgkin‘s lymphorna, 10 cases of focal nodular hyperplasia, 2 cases of chronic inflammation, 1 tuberculosis case and 1 schistosomiasis case. Biopsy provided histological diagnosis in 100% of cases, sensibility and specificity of Ultra-Cut biopsy was 98.95% and 100% for the diagnosis of malignancy respectively; positive predictive value, 100% ; negative predictive value, 71.43% ; and accuracy, 98.98 %. We identified no major procedure related complications despite the presence of thrombocytopenia in 37. 5% of cases. Pain was the only reported adverse effect of liver biopsy (10.97%), and 11 patients required analgesics. We concluded that Ukra-Cut liver biopsy was a safe and effective technique, and was invaluable in the investigation and management of patients with liver lesions.