上消化道疾病人工智能辅助决策方法研究

在基于电子胃镜影像的上消化道疾病智能辅助决策过程中,现有的方法较少涉及胃镜图像的可疑病灶定位和细粒度分类,且服务延迟较高。此外,这类方法所采用的传统数据扩充方法更进一步的降低了辅助决策方法的实际性能。因此本文提出了基于电子胃镜影像的上消化道疾病智能辅助诊断框架,首先使用条件对抗生成网络实现原始胃镜图像数据增强,然后设计k-Lconv模块,在此基础上开发上消化道病灶检测方法Lconv-YOLO,并利用来自某三甲医院真实的临床数据进行方法验证。实验结果表明,相比同类方法,本方法能够有效提高上消化道疾病推断的平均精度和病灶定位精度。本方法将平均检测一帧胃镜视频的时间缩短至6.73ms,敏感性和特异性分别达到79.39%和87.94%。满足电子胃镜检查过程中的视频帧实时高精度辅助诊断决策。     

Origins of linguistic zonation in the Australian Alps. part 1 - Huygens' principle

The hitherto poorly recorded boundaries of extinct traditional south-east-Australian Aboriginal languages can now be redetermined with greatly improved precision using an entropy-maximizing phonetic-signature calculated from existing data sources, including old word-lists and census forms, that have, until now, largely been considered informationally worthless. Having thus determined traditional Aboriginal language zones to a previously unimaginable degree of geographical precision, it is argued that these boundaries should not be viewed merely as a static 'snapshot' but, instead, as the end-product of a knowable dynamic process (Gillieron wave propagation) governed by well-known physical rules (such as Huygens' principle and Snell's Law) and operating over 'deep' time-scales more familiar to the archaeologist than the linguist. Although this initial study is limited to south-eastern Australia, the new methodology provides the first real hope of obtaining a detailed understanding of language dispersal throughout the entire continent over the past 60,000 years.     

《桂花蒸阿小悲秋》的原型分析

本文采用原型分析的方法 ,通过对“暴雨”等意象的原型分析和人物行为的“细读” ,否定了作品“佣人劳碌”和“母性博爱”的题旨 ,认为这是一篇求爱不得的作品。     

New Methods for Evaluating Energy Infrastructure Development Risks

Many energy technologies that can provide reliable, low-carbon electricity generation are confined to nations that have access to robust technical and economic capabilities, either on their own or through geopolitical alliances. Equally important, these nations maintain a degree of institutional capacity that could lower the risks associated with deploying emergent energy technologies such as advanced nuclear or carbon capture and storage. The complexity, expense, and scrutiny that come with building these facilities make them infeasible choices for most nations. This paradigm is slowly changing, as the pressing need for low-carbon electricity generation and ongoing efforts to develop modular nuclear and carbon capture technologies have opened the door for potentially wider markets, including in nations without substantial institutional capacity. Here, using advanced nuclear technologies as our testbed, we develop new methods to evaluate national readiness for deploying complex energy infrastructure. Specifically, we use Data Envelopment Analysis—a method that eliminates the need for expert judgment—to benchmark performance across nations. We find that approximately 80% of new nuclear deployment occurs in nations that are in the top two quartiles of institutional and economic performance. However, 85% of potential low-carbon electricity demand growth is in nations that are in the bottom two quartiles of performance. We offer iconic paradigms for deploying nuclear power in each of these clusters of nations if the goal is to mitigate risk. Our research helps redouble efforts by industry, regulators, and international development agencies to focus on areas where readiness is low and risk correspondingly higher.     

临近隧道基坑开挖中土体加固的敏感性分析

结合某软土地区基坑开挖对邻近隧道纵向影响保护方案,利用ABAQUS动态模拟基坑开挖对临近隧道纵向变形及隧道断面弯矩的影响,对比分析坑内三轴搅拌桩土体加固强度与加固深度作为保护方案的敏感性。分析得出:随着加固强度的增加,隧道纵向位移有显著减少,达到一定值后,约束作用明显减弱;加固强度的增加对隧道纵向截面弯矩影响较弱;加固深度对隧道的变形有明显的抑制作用,但并非加固深度越深越好;地下连续墙、被动土体加固对临近基坑开挖引起的位移具有阻断作用;针对本案例,提出最优加固强度200 MPa及加固深度6 m,这既能对隧道变形起到很好抑制作用,又能实现最优的经济效益。     

地连墙变形影响因素分析及支撑设计研究

结合工程实例,利用有限元分析软件PLAXIS模拟地下连续墙设计参数,探讨不同设计对地连墙变形影响大小及差异,并根据分析结果对支撑设计方法进行优化。结果表明:适当增加墙体刚度,可以有效减小地连墙侧移;如满足地连墙最小入土深度,再增加入土深度意义不大;用混凝土支撑替换钢支撑、增加支撑刚度、减小支撑水平间距以及必要时在竖直方向上增加一道支撑对减小墙体变形具有较好的作用;同时对基坑周围软弱土体及结构薄弱区域进行土体加固对控制基坑变形效果明显。     

江永“三千文化”特色旅游产业深度开发探讨

随着现代社会的飞速发展,文化旅游正成为一种备受青睐、生机盎然的旅游形式。文化是旅游的灵魂,旅游是文化发展的重要途径。江永县三千文化积累深厚,文化类型极其丰富,文化资源难以估价。如何抢抓机遇,积极作为,加快江永县特色文化旅游产业的深度开发是一个重大而紧迫的课题。     

论李商隐的咏嫦娥诗

李商隐的咏嫦娥诗数量虽不多,但意蕴却极为丰富和独特。诗人不仅对闭守月宫孤寂而凄楚的嫦娥深表同情,同时又赋予嫦娥高洁出尘的品质,借此寄托自身的爱情追求和身世感慨。     

塔河油田超深超稠油藏采油新技术研究

塔河油田是我国发现的第一个超深超稠碳酸盐岩油藏,埋深5350~6600m,80%的储量为特超稠油,开发极其困难。从稠油的粘度影响因素出发,以塔河油田近10年的开发实践为基础,对目前在塔河油田广泛应用的掺稀降粘工艺的机理、实践等各个方面进行了详细分析和探讨。研究认为,常规的热采工艺不适合塔河油田,掺稀降粘、大工作制度生产、掺热稀油生产、复合接力泵工艺技术、化学降粘等都是一些行之有效的开采工艺,塔河油田的开发为我国超深超稠油藏的开采提供一个可以借鉴的开采经验。     

压强和温度对薄膜折射率的影响模型

基于膜分子和气相分子在沉积时竞争的观点,得到压强和温度对薄膜折射率影响的理论模型.模型的研究表明,薄膜折射率随真空压强的增加而降低;并随沉积温度的增加而增加.在不同真空压强和不同沉积温度下制备了氧化锆薄膜,计算了样品的折射率,结果显示的规律和理论模型的规律基本一致.