堰筑湖底隧道围护结构选型分析——以竺山湖隧道为例

隧道基坑围护方案的选择是隧道建设中的一个关键环节,文章结合工程实例,根据隧道所处的位置环境、开挖深度以及地质条件等,对几种围护方案的选择进行了分析论述,同时阐述了围护结构构造设计及计算结论,对类似工程的实施具有一定的参考意义.     

带热电偶数显温度巡回检测仪校准方法的研究

本文通过对巡检仪进行示值稳定性、重复性的试验,探讨热电偶的选择与巡检仪示值之间的关系,以确定校准方法,指导使其有效溯源.     

中空激光光内送粉熔池温度控制研究

在激光增材制造过程中,熔池温度的稳定性是表征加工过程稳定性的一个重要指标.设计一套控制熔池温度的闭环反馈系统,以达到控制熔池温度,提高成形件质量.基于C#编程软件实现了温度信号的传递,采用PID控制算法设计了温度控制器.实验结果表明,此系统能实时、准确地实现熔池温度的闭环控制,能够有效消除直壁墙熔覆过程中因热累积而造成的“蘑菇云”现象,且成形件几何精度有显著提高,各处显微组织差异较小,组织致密均匀.     

Authenticity green coffee bean species and geographical origin using near-infrared spectroscopy combined with chemometrics

To prevent the adulteration of agricultural resources and provide a solution to enhance the green coffee bean supply chain, authentication using the near-infrared spectroscopy (NIRS) technique was investigated. Partial least square with discrimination analysis (PLS-DA) models combined with various preprocessing methods were built from NIR spectra of 153 Vietnamese green coffee samples. The model combined with the standard normal variate and the first order of derivative yielded excellent performance in predicting coffee species with the error cross-validation of 0.0261. PLS-DA model of mean centre and first-order derivative spectra also yielded good performance in verifying geographical indication of green coffee with the error of 0.0656. By contrast, the predicting abilities of post-harvest methods were poor. The overall results showed a high potential of the NIRS in online authentication practices.     

平行坐标技术在干式变压器温度场可视化分析中的应用

本文中笔者将平行坐标技术应用于变压器温度场多维可视化分析,以矿用变压器为例,给出了其高、低压绕组纵向温度分布.     

OBE-CDIO理念下“集成电路版图分析与设计”课程教学改革与探索

针对目前集成电路版图分析与设计课程存在教学方法老化、教学模式形式化等问题,本文以OBE-CDIO教育理念为指导,对”集成电路版图分析与设计”课程的课程教学模式、课程设计、项目式教学方式和课程考核方式等方面的改革进行有益的探索与实践。将工程教学认证中对学生的专业毕业要求作为制定教学目标的依据,将BB网络平台、ISO9001等现代化教学资源和质量标准融入课堂教学,采用OBE-CDIO能力教学理念指导课程设计,实现教学环节与考核环节的科学化与多元化,通过引入课程思政激发学生学习热情,树立社会主义核心价值观,全面地培养学生的综合版图分析与设计能力和素养。     

A Case Report of Germline Compound Heterozygous Mutations in the BRCA1 Gene of an Ovarian and Breast Cancer Patient

The germline carrier of the BRCA1 pathogenic mutation has been well proven to confer an increased risk of breast and ovarian cancer. Despite BRCA1 biallelic pathogenic mutations being extremely rare, they have been reported to be embryonically lethal or to cause Fanconi anemia (FA). Here we describe a patient who was a 48-year-old female identified with biallelic pathogenic mutations of the BRCA1 gene, with no or very subtle FA-features. She was diagnosed with ovarian cancer and breast cancer at the ages of 43 and 44 and had a strong family history of breast and gynecological cancers.