分析了国内外环氧乙烷生产消费现状及发展前景。针对存在的问题，提出了加快技术开发，尤其是催化剂的研发，实现关键技术的国产化；科学布局，合理规划下游装置以及加快下游精细化工产品的开发与应用等建议。

关键词：环氧乙烷；国内外；供需；市场

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Pentaerythritol is an alcohol with four hydroxyl groups. It is manufactured using formaldehyde and acetaldehyde, through the aldol condensation process, followed by a crossed Cannizzaro reaction. Pentaerythritol is used in various applications such as alkyd paints, inks, varnishes,adhesives and sealants, and plasticizers

关键词：季戊四醇；醛醇缩合反应；交叉坎尼扎罗

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A railway management system is an automatic system that is used in the railways to improve efficiency. Earlier, manual systems were used in railways; this made it difficult to exchange information from the train to the ground, causing a delay in displaying information for passengers. In this era of hyper-urbanization, people want a faster and more convenient mode of transportation. Therefore, the rapid economic and demographic growth across the world is driving the growth of the Global Railway Management System market. In addition, technological advancement is another factor that is propelling the growth of railway infrastructures. Since the Railway industry is one of the major contributors to the economic growth of a country, there is an inherent need for an efficient management system. In this regard, advanced technology will help the railways to upgrade their management and operational systems.

关键词：铁路管理系统；提高；自动化系统；效率；手动系统

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Powder coatings are a type of solvent-free coating product, which are used to provide a dry finishing process. They are known for their high-quality and durable finish.

关键词：粉末涂料；涂料产品；挥发性；机化合物

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Particle size analysis is a technique used to determine the size of particles in materials such as powder or liquid.

关键词：粒度分析；确定材料；粉末；液体；功能材料

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Precision air conditioning systems are cooling solutions designed for efficient cooling of data centers. These solutions maintain the temperature and humidity levels in the data center. The rapid increase in the adoption of high-performance computing and data processing solutions in the data center has increased the demand for precision cooling solutions to be incorporated as part of data centers. Some enterprises are also adopting economizer technology in their data centers to increase cooling efficiency.

关键词：精密空调系统；制冷设计数据；高效；散热解决方案

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Nicotine gum is a smoking cessation product that helps smokers to slowly get off nicotine. Nicotine released from chewing nicotine gum is absorbed into the blood stream through the linings of the mouth. Nicotine gums help the human body battle the strong urges for nicotine after cutting down on cigarettes. They are available in various dosages and can be consumed according to the level of addiction.

关键词：尼古丁口香糖；戒烟产品；帮助；有助于；人体战斗

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Micro electric vehicles are vehicles that have electric battery propulsion with a power rating between 4 kWh and 10 kWh, and they are generally two- to four-seater vehicles. This class of vehicles was earlier considered in the electric vehicles category, but as a result of the increased demand for micro electric vehicles and the rapid growth of the market, they are now considered as a category. The Micro Electric Vehicles market is classified into three segments: Quadricycles, Golf Carts, and Mobility Vehicles for the Disabled.

关键词：微型电动汽车；额定功率；电池；四轮车；高尔夫球车；移动车辆

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 As of 2013, goals to eliminate rubella have been established in two World Health Organization regions (the Region of the Americas by 2010 and the European Region by 2015), and targets for accelerated rubella control and CRS prevention have been established by the Western Pacific Region (WPR) (2). In 1976, Japan introduced single-antigen rubella vaccine in its national immunization program, targeting girls in junior high school. In 1989, a measles-mumps-rubella (MMR) vaccine was introduced, targeting children aged 1272 months. However, adult males remain susceptible to rubella. From January 1 to May 1, 2013, a total of 5,442 rubella cases were reported through the rubella surveillance system in Japan, with the majority (77) of cases occurring among adult males. Ten infants with CRS were reported during October 2012May 1, 2013. Countries and regions establishing a goal of accelerated control or elimination of rubella should review their previous and current immunization policies and strategies to identify and vaccinate susceptible persons and to ensure high population immunity in all cohorts, both male and female.

关键词：流行病学；风疹；出疹性疾病；免疫接种；疫苗

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Metabolites are the small molecules that are present in blood, urine, and tissues. Metabolomics or metabonomics is the scientific study of the measurement and analysis of metabolites.

关键词：代谢物；代谢组学；测量；代谢物分析；科学研究

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