简介:摘要:由于极端气候和交通荷载加剧,近几年交通路面承受体量大、车辆体型大、车辆超载严重以及公路渠化等问题。沥青路面未达到服役寿命便损坏严重造成对人民生命财产安全的威胁,严重影响了我国基建的服务质量。高模量沥青由于优异的高温性能和耐久性而得到许多应用,然而其低温性能不足限制了其更广泛的使用潜力,本文将从背景和研究意义出发,描述高模量沥青的研发和改善工艺,从其重要的几个参数性能中,分析其各项性能的提升。
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简介:摘 要:高模量沥青混合料作为一种新型材料,与普通沥青施工工艺与质量控制有所不同,本文依托西安绿廊项目,对比分析混合料的拌制、运输、摊铺、碾压等过程控制的异同。加强管理,为后续施工和类似项目提供借鉴。
简介:AbstractMucormycosis is a lethal human disease caused by fungi of the order Mucorales. Mucormycosis is caused by fungi mainly belonging to the genera Mucor, Rhizopus, and Lichtheimia, all of which belong to the order Mucorales. The number of individuals with mucormycosis-causing disorders has increased in recent years, hence, leading to the spread of mucormycosis. Throughout the coronavirus disease 2019 (COVID-19) pandemic, numerous cases of mucormycosis in COVID-19-infected patients have been reported worldwide, and the illness is now recognized as COVID-19-associated mucormycosis, with most of the cases being reported from India. Immunocompromised patients such as those with bone marrow sickness and uncontrolled diabetes are at a greater risk of developing mucormycosis. Genes, pathways, and other mechanisms have been studied in Mucorales, demonstrating a direct link between virulence and prospective therapeutic and diagnostic targets. This review discusses several proteins such as high-affinity iron permease (FTR1), calcineurin, spore coat protein (CotH), and ADP-ribosylation factors involved in the pathogenesis of mucormycosis that might prove to be viable target(s) for the development of novel diagnostic and therapeutic methods.
简介:摘要:为提高夏季高温下沥青路面抗车辙能力,本文选择两种低标号硬质沥青和两种高模量剂改性沥青,在胶结料和混合料方面研究高模量技术在抗车辙能力的优势性。结论如下:70#+PR、70#+AF-1、30#、20#相比70#基质沥青针入度降低,软化点增大,延度降低,相关研究表明,高模量沥青的延度和混合料的低温抗裂性性能关联不大,还需要混合料试验验证,从软化点指标看,高模量沥青较基质沥青高温性能大幅度提升,提高沥青高温性能。高模量沥青的动稳定度远高于基质沥青,70#+AF-1混合料达到10620,70#+PR混合料也达到9200,有着优异的高温稳定性,提高路面夏季高温抗车辙能力,70#+PR、70#+AF-1、30#、20#沥青混合料的疲劳寿命为:113.5,123.5,102.3,112.5万次,均大于规范规定的100万次,同时大于基质沥青混合料96.23万次,提升了混合料疲劳性能,70#+PR、70#+AF-1、30#、20#沥青混合料的动态模量为:15245,16229,17580,20827Mpa均满足规范大于14000Mpa的指标,比基质沥青8950Mpa将近提升了一倍,力学性能大幅度提升。
简介:摘要:道路工程建设质量与人民大众日常出行息息相关,在工程投用后,路面会长期受到车辆的碾压,因此在工程建设中,路面的施工最受关注。过去运用传统的沥青材料进行路面施工,不仅容易受到自然条件的影响,而且随着时间的推移,很容易出现裂缝、变形等情况。经实践检验,以高模量沥青混凝土替代传统的沥青材料,能够优化路面结构的抗损坏性能、防水性能和抗开裂性能,明显提升路面施工的综合质量水平。高模量沥青混凝土材料一般是指模量高于改性沥青混合料的特种沥青混合料,目前高模量沥青混合料主要是在混合料拌制过程中掺加高模量剂以达到提高沥青混合料模量的作用,解决路面强度不足以及沥青混合料高温性能不良造成的路面病害问题,为道路施工工作的开展奠定更加坚实的基础。本文就高模量沥青路面施工质量的控制进行分析。
简介:AbstractIn order to effectively implement the Tianjin Biosecurity Guidelines for Codes of Conduct for Scientists, biosecurity awareness-raising and education are essential because if these are not in place scientists will not understand the need for biosecurity codes of conduct. In an effort to assist in the implementation of the guidelines, a small-scale survey was carried out in early 2022 of biosecurity awareness-raising and education projects that have been developed over the last two decades to discover what resources and experience have been accumulated. It is argued that the survey demonstrates that much of what is needed to implement the guidelines effectively has been developed, but that there are specific deficiencies that need to be remedied quickly. In particular, an updated teaching resource covering the core issues related to the Biological and Toxin Weapons Convention (BTWC) and the problem of dual use in scientific research needs to be made widely available and translated into at least the six official United Nations (UN) languages. Additionally, more specialists from the Humanities with expertise in ethics need to become involved in biosecurity awareness-raising and education activities. While advantage should be taken now of the available national, regional and international networks of people involved in related activities, it is suggested that in the longer term cooperation in biosecurity awareness-raising and education will benefit from the development of an equivalent organisation to the International Nuclear Security Education Network (INSEN) organised through the International Atomic Energy Agency (IAEA).
简介:摘要 工艺压缩机广泛应用于生产中,其可靠性、寿命及能耗直接影响生产运营的正常性、安全性及经济性。选取合适的压缩机具有至关重要的意义。首先介绍了常见工艺压缩机的分类及适用范围,然后详细对比了不同类型压缩机的特点,并以工程设计中遇到的选型工况作为案例为工艺压缩机的合理选型提供了原则和方法。
简介:摘要:原料天然气在开采过程中伴随着大量采出水,通过集气站内的分离器进行气液分离,如站内分离器排液系统故障或上游无脱水撬集气站清管作业过程中操作不当或排液不及时,大量的采出水会进入压缩机站高效分离器,高效分离器电动球阀来不及排液,则会导致采出水带入压缩机,造成压缩机气缸进液,对气阀、曲轴、连杆损害很大,导致压缩机故障停机。作业四区通过分析可能造成压缩机进液的各种因素,提出了改进方案并组织实施,经改造后可以彻底预防压缩缸进液,有效保护压缩机的安全运行,满足了生产需求,效果良好。