CT增强薄层靶扫描与MRCP在IPMN良恶性鉴别诊断中的对比研究

目的 比较CT增强薄层靶扫描和MRCP在胰腺导管内乳头状粘液性肿瘤(IPMN)良恶性鉴别诊断中应用价值的差异。方法 收集45例经手术切除病理证实、同时行CT增强薄层靶扫描和MRCP检查的IPMN患者影像资料,按2017福冈指南专家共识标准,分别分析并计算CT增强薄层靶扫描和MRCP检查病灶出现的征象中,肿瘤强化壁结节≥5mm、主胰管扩张≥10mm、胆管扩张、厚分隔、胰腺萎缩、分支胰管型最大囊肿≥3cm在鉴别诊断IPMN良恶性的准确性、曲线下面积(AUC)、敏感性及特异性,统计比较两组间的差异。结果 各影像征象诊断恶性IPMN两种检查方法间差异均无统计学意义(P>0.05)。综合以上四个影像征象,CT增强薄层靶扫描诊断恶性IPMN中的总准确性、敏感性、特异性及分别为:86.67%、87.10%、85.71%,阳性预测值及阴性预测值为93.10%、75.00%;而MRCP在诊断恶性IPMN的总准确性、敏感性、特异性及分别为80.00%、80.64%、78.50%,阳性预测值及阴性预测值为89.28%、64.70%,且各征象总的诊断效能,两种检查方法组间差异均无统计学意义(P>0.05)。结论 CT增强薄层靶扫描,可以作为缺乏MRCP设备的基层医院诊断恶性IPMN的一种有效的替代检查方法。

地震带电综合环境试验中试品放电的暂态过程仿真分析

地震带电综合环境试验可模拟设备真实突发工况,能考核设备在地震时的安全性和可靠性,验证设备的设计并发现特殊工况中可能出现的问题和缺陷。基于某大型地震试验台,搭建了±1100kV直流电压互感器在地震带电综合环境试验中异常放电的仿真模型,分析了放电电流的峰值和频谱,研究了不同电容量试品对放电电流峰值的影响,并给出了地震台测控系统的抗干扰措施和建议。

A Study on the Relationship Between Cultural Identity,Place Attachment,and Tourist Loyalty

Tourist loyalty is an important factor that affects tourist destinations’competitiveness and has a great practical meaning for the sustainable development of tourist destinations.Based on the theory of cognition-emotion-intention,this study takes Mount Wutai,a World Cultural Heritage in China as an empirical case,to conduct an empirical study on the relationship between cultural identity,place attachment,and tourist loyalty,using a structural equation model.The results show that:First,tourist cultural identity can form an extension of behavior and has a positive direct effect on tourist loyalty.Besides,spiritual culture identity is more likely to exert a significant positive effect on tourist loyalty.Second,cultural identity has a partial impact on place attachment,and spiritual cultural identity has a positive effect on place attachment.Material cultural identity is only a direct positive drive to place identity.Third,place attachment partially mediates the relationship between cultural identity and revisit intention.Besides,place identity has a partial mediating effect between cultural identity and recommendation intention.This paper expands the research on the influence mechanism of tourist loyalty,verifies the direct driving effect of cultural identity on tourist revisit intention and recommendation intention,and puts forward relevant suggestions for managing cultural tourism destinations.

A Study on the Path Mechanism of Para-social Interaction and Place Attachment on Film-Induced Tourists’Behavioral Intention

Under the influence of celebrity effect and para-social interaction,film is increasingly able to induce viewers’willingness to travel.Based on the theory of para-social interaction and the factors of place attachment,this study constructs a model of the influence mechanism of film-induced tourists’behavioral intention and puts relevant hypotheses.Taking the film A Little Red Flower as an example,the empirical test is carried out by using structural equation model(SEM).The results show that:(1)Film-induced tourists’emotional involvement has a significant positive impact on tourism behavioral involvement,but has no direct and significant impact on place dependence and place identity.(2)Film-induced tourists’behavioral involvement has a significant positive impact on place dependence and place identity.(3)Both place dependence and place identity of film-induced tourists have significant positive impact on tourism behavioral intention.Therefore,film tourism destinations should show the unique local conditions and customs according to the preference of fans and audiences,with the help of the popularity of film,so as to improve their tourism behavior intention.

1100 kV GIS/GIL产品电气试验专用工装的设计

气体绝缘开关设备(GIS)和气体绝缘输电线路(GIL)产品的出厂电气试验通常是在总装车间内进行的,根据某1100 kV GIS/GIL总装车间电气试验需求,设计了满足工频耐压试验、局放试验及冲击试验的专用工装。采用六氟化硫(SF_(6))气体绝缘试验变压器和冲击发生器降低了厂房高度,节约了厂房建设投资;为确定工频电源补偿容量,计算了计及试验工装后的负载电容电流,还利用ATP-EMTP评估了GIS/GIL工装电容、电阻和电感对雷电冲击试验波形参数的影响,可供相关的试验技术人员参考。

信息化靶向行为干预模式在初诊中青年糖尿病中的应用效果

目的探讨信息化靶向行为干预模式在初诊中青年糖尿病患者中的应用效果。方法选择我院2016年5~12月首次确诊的中青年糖尿病患者60例作为研究对象,随机分为试验组和对照组,各30例,试验组实施基于信息化平台的靶向行为干预模式,对照组实施基线测评和常规糖尿病健康教育,干预前及干预后6个月采用《糖尿病知识问卷》《糖尿病自我管理行为量表(SDSCA)》对两组患者进行测评,比较两组干预前、干预后6个月的空腹血糖(FPG)、餐后2h血糖(2h PG)、血脂(TG)、糖化血红蛋白(HbA1c)及体重指数。结果两组患者干预前糖尿病知识问卷得分、自我管理良好患者比较,差异无统计学意义(P>0.05);干预后6个月后,实验组糖尿病知识问卷得分为(86.81±3.16)分,高于对照组的(59.73±4.62)分,差异有统计学意义(P<0.05);实验组自我管理良好患者(96.43%)多于对照组(57.69%),差异有统计学意义(P<0.05);实验组FPG、2h PG、HbA1c、TG、体重指数均优于对照组,差异有统计学意义(P<0.05)。结论信息化靶向行为干预模式能提升初诊中青年糖尿病患者的糖尿病知识水平,进而改善其自我管理依从性,有助于患者糖代谢及血脂、血压等代谢指标的控制。