融合常用语的大规模疾病术语图谱构建

国家卫计委要求医疗机构使用国际疾病分类(international classification of diseases, ICD)编码,然而由于临床疾病描述存在大量的常用词,导致电子病历中录入的诊断名称与ICD编码直接映射匹配率低.基于区域健康平台上的真实诊断数据,构建了融合常用语的疾病术语图谱.具体来说,在基于疾病构成成分的规则算法基础上,提出了基于数据增强的BERT(bidirectional encoder representation from transformers)上下位关系识别算法,将5万多个诊断常用语和ICD10(international classification of diseases 10th revision,Chinese version)中的疾病进行同义关系和上下位关系识别,进一步融合了ICD11(international classification of diseases 11th revision,Chinese version)的层次结构,此外,还提出了基于疾病-科室关联图谱的任务分配方法以进行人工校验,最终94 478个疾病实体形成了包含1 460条同义关系、46 508条上下位关系的大规模疾病术语图谱.评估实验表明,基于疾病术语图谱,对临床诊断数据的覆盖率比基于ICD10的直接映射编码的覆盖率提升了75.31%,另外,利用疾病术语图谱自动进行编码疾病相比于医生人工编码会缩短约59.75%的编码时间,且正确率达到85%.
     

免共振沉桩原位试验研究

为解决传统桩基施工过程中存在的环境污染、挤土效应、效率低及能耗高等突出问题,以某高架桩基工程为例,基于免共振液压振动锤系统沉桩施工工艺,通过原位沉桩试验测试、现场振动测试,研究钢管桩沉桩过程中桩周土体、地铁运行期间桥墩变形特征及其振动变化规律。研究结果表明:钢管桩沉桩过程中桩周土体水平位移集中分布在近地表0～2/3L(L表示桩长)范围内,地表以下0～1/4L范围水平位移较大,土体水平和竖向位移最大值分别为2.37 mm和3.13 mm,桥墩倾斜0.4‰～0.7‰,分析发现沉桩过程中挤土效应不明显;现场振动测试结果显示,当无地铁经过时桥墩振动速度最大峰值为0.823 mm/s,有地铁经过时为1.90 mm/s,充分表明沉桩过程对周边环境影响程度弱;实现了对环境"低影响"的效果,为沉桩施工新技术的研发提供理论和实践指导。     

钙基蒙脱土的钠化改型

研究了不同改型剂、温度、时间和改型剂加入量等条件对钙基蒙脱土钠化改型的影响,通过CEC的测定进行了比较分析,确定较好的钠化条件为:以改型剂多聚磷酸钠用量2%,钠化温度60℃,搅拌时间12 h.     

Thermal hydraulic and safety analysis for core conversion (HEU–LEU) of Syrian Miniature Neutron Source Reactor

The paper presents the behavior and properties analysis of the low enriched uranium fuel compared with the original high enriched uranium fuel. The MNSR reactor core was modeled with both fuel materials and the reactor behavior was studied during the steady state and abnormal conditions. The MERSAT code was used in the analysis. The steady state thermal hydraulic analysis results were compared with that obtained from the experimental results hold during commissioning the Syrian MNSR. Comparison with experimental data shows that the steady-state behavior of the HEU core was accurately predicted by the MERSAT code calculations. The validated model was then used to analyze LEU cores with two proposed UO₂ fuel pin designs. With each LEU core, the steady state and 3.77 mk rod withdrawal transient were run and the results were compared with the available published data in the literatures for the low enriched uranium fuel core. The results reveal that the low enriched uranium fuel showed a good behavior and the peak clad temperatures remain well below the clad melting temperature during reactivity insertion accident.     

丙烯腈装置AOGI国产化技术的开发及应用

开发了先进的丙烯腈装置废气焚烧及余热回收技术(AOGI),采用了燃烧器三级配风技术、AOG多级焚烧技术、氧化段配风技术以及高温烟气余热回收技术,将丙烯腈装置AOG中的有毒成分(丙烯腈、氢氰酸等)通过高温氧化焚烧,实现了无害化达标排放.     

水下液电强声技术的研究进展与展望

主要从强声技术的应用需求出发,阐述了水下液电强声的产生机理、物理特性和传播特性,介绍了水下强声能领域的研究进展,总结了水下强声能武器发展中的关键和瓶颈问题,最后给出了水下强声技术的发展展望。     

连续波声呐中的调频信号设计方法及性能分析

相对传统的短时脉冲波主动声呐而言,连续波主动声呐是一种新型体制的声呐设备,允许在扫描周期内发射高占空比的信号,并且在发射信号的同时进行侦听,由此可以对水下目标实现连续照射,消除距离盲区。由于发射和接收机制的不同,连续波主动声呐对发射信号的波形和处理方法也各有差异,一是要考虑到"直达波"抑制问题,二是要在时间带宽积和对目标的照射时间间隔两者之间进行折中。针对上述两个问题,设计了一种在连续波主动声呐中发射的新型脉冲串信号,该类信号由多个相互正交的广义正弦调频信号串组成,以此在频域上消除回波与拷贝信号的相关性;后置处理中对接收回波提供了三种不同的方案,在时间带宽积和照射时间间隔两者之间择优选择最佳检测效果。计算机仿真结果表明:该类信号波形以及相应的处理方法可以有效地抑制直达波干扰并给出目标的速度-距离信息。     

Analysis of dynamometry scheme for semi-physical simulation platform of space docking mechanism

The semi-physical simulation platform of space docking mechanism is one of the main ground testing equipments for study of docking mechanism, and is used to simulate docking procedure. In order to demonstrate test-bed schemes, analysis for the semi-physical simulation platform must be carried out. First, impacting model of docking mechanism and mathematic model of two spacecrafts motion are set up in this paper. Then, determination methods of passive spacecraft impacting torques are analyzed when adopting single-sensor scheme. Finally, representative conditions are simulated adopting single-sensor and double-sensor schemes separately. Simulation results indicate that the declinations of position, velocity of two spacecrafts and that of two docking mechanisms are less, so the single-sensor scheme for the semi-physical simulation platform is presented in this paper.     

Impact of oxygen and nitrogen compounds on the lubrication properties of low sulfur diesel fuels

This paper presents the impact of oxygen and nitrogen compounds on the lubrication properties of low sulfur diesel fuels. It discusses the most recent results, concerning the influence of adding low amounts of 4 specific types of biodiesel, 5 aliphatic amines, 2 tertiarty amides, 10 mono-carboxylic acid esters, 3 acetoacetates and 7 esters of di-carboxylic acids on the tribological behaviour of the steel-on-steel systems, lubricated with low sulfur automotive diesel fuel. Experiments were carried out on the HFRR (high frequency reciprocating rig). The obtained wear results showed that all the various classes of additives improved fuel lubricity.     

热双金属元件在小型断路器中的设计与优化

为解决小型断路器热脱扣的问题,提供了一种新的双金属元件关键参数的设计分析方法。同时提出了类似用途热双金属元件效率系数的概念,为更高效、低成本地使用双金属元件阐述了应用分析方法。