Synthesis and applications of unsaturated polyester resins based on PET waste

Three types of unsaturated polyester resins were synthesized from the glycolysis of polyethylene terephthalate (PET) plastic waste, considering environment, cost and properties for their applications. These synthesized unsaturated polyester resins could be used for various construction processes and materials such as no dig pipelining (NDR-1), pultrusion (PLR-1) and polymer concrete (PCR-1). PET was taken from common soft-drink bottles, and ethylene glycol (EG), diethylene glycol (DEG) and MPdiol glycol mixtures were used for the depolymerization at molar ratios. The glycolyzed PET 1 ^st products (oligomers) were reacted with maleic anhydride, phthalic anhydride and dicyclopentadiene (DCPD) (especially for polymer concrete) to form unsaturated polyester resins with mixed styrene. The lab scale (1–5 kg) and pilot plant scale-up tests (200 kg) were experimented to evaluate the processing characteristics, viscosity, acid number and curing behaviors. The main properties such as hardness, flexural strength, tensile strength, heat distortion temperature, elongation, and chemical resistance were determined based on the various uses of the three resins. Furthermore, the applicability and the properties of these developed resins were verified through many real application tests.     

DHCP中继在路由交换网络中的设计与应用

路由交换网络是当前流行的网络架构,DHCP是当前主流的获得IP地址协议.在现有的网络设备上利用DHCP中继技术实现动态IP地址的分配,既节省网络建设成本,又方便统一管理.在真实设备上实验表明：方案运行稳定、效率较高、无需额外的DHCP服务器且易于实现.     

A small samples training framework for deep Learning-based automatic information extraction: Case study of construction accident news reports analysis

Knowledge management is crucial for construction safety management. Widely collected and well-organized safety-related documents are recognized to be significant in raising the workers' security awareness and then to prevent hazards and accidents. To improve document processing efficiency, automatic information extraction plays an important role. However, currently, automatic information extraction modeling requires large scale training datasets. It is a big challenge for the engineering industry, especially for the fields which heavily rely on the experts’ knowledge. Limited data sources, and high time and labor costs make it not practical to establish a large-scale dataset. This work proposed a natural language data augmentation-based small samples training framework for automatic information extraction modeling. With the designed cross combination-based text data augmentation algorithm, the deep neural network can be employed to build up automatic information extraction models without large-scale raw data and manual annotations. Characters semantic coding is employed to avoid word segmentation and make sure that the framework can be utilized in different writing language systems. The BiLSTM-CRF model is adopted as the detection core to conduct character classification. Through a case study of two independent accident news report datasets analysis, the proposed framework has been validated. A reliable and robust automatic information extraction model can be established, even though with small samples training.     

基建矿井“一通三防”安全管理模式

矿井"一通三防"工作在煤矿安全生产工作中是重中之重,是预防重大安全事故的决定性因素。对于基建矿井而言,"一通三防"系统的投入受现场条件以及工期等因素影响未能及时得到完善,给矿井的安全生产管理带来一定的难度。为了保障基建矿井的安全高效生产,采用了基础管理和科学管理相结合的安全管理模式,即通过辐射培训、强化"两系统"管理和开展专项安全检查不断完善质量标准化保障安全生产;利用科学管理促进安全高效生产。     

浅谈病险水库出险加固工程建设期的环保措施方案

环保措施方案是病险水库出险加固工程建设期的一项重要工作内容,面对日趋严峻的环境问题,有必要把环保措施放在更加突出的位置。本文分析了建设期施工现场环境影响的主要因子,并提出了具体的环保措施方案。     

高校图书馆的文化育人功能及其对策研究

图书馆作为一种社会机构,它以收藏与贮存的文献为媒介,以传递为手段,具有社会性、学术性、教育性、服务性的基本性质和多种职能,其中文化育人职能在高校图书馆显得尤为重要,和谐社会的建设离不开校园文化的发展,因此在目前的社会背景下,高校必须把图书馆建设与和谐校园文化建设紧密结合起来,使高校图书馆在构建社会主义和谐社会,建设社会主义和谐文化,特别是在文化育人过程中发挥积极的作用。     

浅谈我国物流企业文化建设

现阶段,我国物流行业发展迅猛,技术手段不断进步,专业人才也不断涌出,硬件方面达到了世界物流企业的平均水平,但是,却忽视了对企业文化的建设。到目前为止,我国少数物流企业认识到企业的发展壮大不能仅仅依赖于引进先进的技术手段和专业人才,建设企业自身的文化对于企业立足于激烈的市场竞争有很大的优势。本文分析了企业文化的内涵及其对企业发展的意义,以及我国物流企业文化建设中存在的问题及原因,并提出了相应地解决方法及对策。     

概述城市建设声像档案

城市建设声像档案作为城市建设档案中充满生机和活力的新型载体,正方兴未艾,并以其特有的优势,显示出其广阔的发展前景,对促进城市建设档案事业的发展发挥着重要作用.作者根据当前城市建设声像档案工作的现状,有针对性的以通俗易懂及注解的方式,概述了城市建设声像档案的主要知识,以达到提高人们对其重要性认识的宣传目的.     

基于乡村复兴视角的城郊新农村建设研究——以湖南省益阳市为例

城市的快速发展使得城乡差距迅速拉大,乡村衰败问题日益严重,由此新农村运动开始在全国展开,引发了乡村建设的热潮.本文从乡村复兴的视角出发,结合益阳市城郊新农村清溪村的典型案例,论述了该村在经济、产业、文化、生态环境等方面的复兴发展,进而得出了经济复兴是关键、产业复兴是保障、文化复兴是根本和生态环境复兴是重点等结论.     

关于建设工程安全监理工作的思考

监理单位和监理人员,在履行工程质量监理的同时,必须履行好安全监理的职能,掌握好国家的有关安全质量监理的职责、程序与内容,严格按规范标准实施安全监理,并把安全监理工作贯穿于施工的全过程。具体在施工安全监理工作中做到四个注重:1、注重监理工作的超前性;2、注重监理工作的及时性;3、注重监理工作的原则性;4、注重监理工作的主动性。