How does purchasing intangible services online influence the travel to consume these services? A focus on a Chinese context

Transportation - A considerable number of empirical studies have explored the effects of information & communication technologies (ICT) on travel in recent years. In particular, the most...     

北京市地铁乘客安检安全意识调查分析

近年来,国内外地铁安全事故时有发生,地铁安检作为应对安全隐患的有效防范手段,加强其检查力度也成为国内各个地铁安全部门的共识。安检会增加乘客的延误时间,使乘客对地铁安检颇有微词,乘客与安检员发生冲突的事件也屡有发生。为增强乘客的地铁安全意识,改进安检流程,通过问卷调查和统计分析,对北京市地铁乘客进行调查,分析其评价水平及影响因素。结果表明,北京市地铁乘客的平均安全意识得分为74.16分,为中等水平,其中安全行为、安全态度、安全知识三个维度分别处于较高、中等、较低水平。该调查有助于地铁安全部门有针对性地制定地铁安检的宣传方案,提高服务水平,改善安检流程。     

断路器脉冲脱扣器开关电路仿真分析

断路器普遍采用脉冲脱扣器实现保护的快速性。本文分析了SCR、IGBT和POWERMOSFET组成的低端开关电路的特点,并对三种脉冲脱扣器低端开关电路进行了仿真。仿真结果说明采用POWER MOSFET并联低端开关电路可快速安全可靠的控制脉冲脱扣器的通断,实现脉冲脱扣器的快速输出。     

后疫情时代国内纯电动乘用车市场发展现状

2020年国内纯电动乘用车市场在新冠肺炎、补贴退坡、各地促销政策陆续出台等多方面因素影响下先抑后扬、市场回暖,呈现出厂商竞争加剧、销售区域转变、私户占比增加、车型趋向高端化等特征。在我国碳达峰、碳中和的宏伟目标下,随着消费者环保认知的不断提升,纯电动乘用车市场将稳步发展并进一步向智能化、自动化方向转变。     

基于结构熵的铁路货车制造企业组织结构优化评价

组织结构扁平化是铁路货车生产企业提升管理效率的重要手段。文章利用结构熵模型,对比分析了传统组织结构与扁平化组织结构的有序度,计算了两种组织结构的时效熵和质量熵。研究发现扁平化组织结构的时效熵、质量熵均高于传统组织结构,相应地,其有序度更优;实际运营表明,扁平化组织结构可以通过重新构建薪酬分配体系、整合相关职能、提升生产节拍、减少生产用工,解决企业各单位薪酬分配不平衡问题、部室车间部分管理职能重叠问题,降低制造成本。     

动车组位置追踪系统常见问题影响分析及解决方法

从动车组位置追踪系统的系统原理、系统接口等方面出发,分析了系统日常应用过程中常见问题的影响,并给出了相应的解决方法,为动车段/所位置追踪系统的设计、应用和维护提供了积极的思路。     

CLINICAL COMPARISION OF THE TREATMENT OF CERVICAL PROLAPSE OF INTERVERTEBRAL DISC BY USING CAGE OR TITANIUM PLATE

In the past,cervical prolapse of intervertebraldisc,a more common cervical vertebral disease,wasoftentreated withremoval of nucleus pulposus com-bined with autogenous iliac crest graft(AICG)andtitaniumplate.In recent years,cage becomes moreand more popular and is accepted gradually.Goodclinical effects have been achieved in the treat mentof cervical prolapse of intervertebral disc by usingSolis cage.However,at present few reports havebeen available to describe the clinical effects of trea-ti…     

TSH RECEPTOR GENETIC ALTERATIONS IN THE AUTONOMOUSLYFUNCTIONING THYROID ADENOMAS

Objective To determine the relationship between TSH receptor gene mutations and autonomously functioning thyroid adenomas (AY‘]rAs). Methods The thyroid samples from 14 cases of diagnosed AFTAs were analyzed, with normal thyroid specimens adjacent to the tumors as controls. The 155 base pairs DNA fragments which encompassed the third cytoplasmic loop and the sixth transmembrane segments in the TSH receptor gene exon 10 were amplified by Polymerase chain reaction (PCR) and analyzed by the single-strand conformation polymorphism (SSCP). Direct sequencing of the PCR products was performed with Prism Dye Terminator Cycle Sequencing Core Kit.Results 6 of 14 AFTA specimens displayed abnormal migration in SSCP analysis. In sequence analysis of 3 abnormally migrated samples, one base substitution at nucleotide 1957 (A to C) and two same insertion mutations of one adenosine nucleotide between nucleotide 1972 and 1973 were identified. No mutations were found in controls. Conclusion This study confirmed the presence of TSH receptor gene mutations in AFTAs; both one-point substitution mutation and onebase insertion mutation were found to be responsible for the pathogenesis of AFTAs.     

血清CPK、LDH、GOT和LAP活性对急性颅脑损伤的诊断价值

对８０例急性颅脑损伤患者血清ＣＰＫ、ＬＤＨ、ＧＯＴ和ＬＡＰ活性进行了测定。结果显示，急性颅脑损伤后血清ＣＰＫ和ＬＤＨ活性显著升高（Ｐ＜０．０５），而血清ＧＯＴ和ＬＡＰＩ活性升高不明显（Ｐ＞０．０５），至于血清酶活性对判断急性颅脑损伤的脑损伤程度和患者预后的价值有待继续探讨。