基于投入产出模型的高技术制造业产业链区域间协同研究——以鄂湘赣新一代信息技术产业协同为视角

为研究新一代信息技术产业在鄂湘赣的产业链协同发展,本文运用里昂惕夫投入产出模型,首先对新一代信息技术产业的后向(前向)直接、间接关联产业部门分别进行定量化分析,构建新一代信息技术产业的产业链,并得出新一代信息技术产业链的主要关联部门。通过计算Ghosh逆矩阵和Leontief逆矩阵的平均值矩阵F,测度鄂湘赣地区产业链主要关联部门间的成本推动效应和需求拉动效应。基于此,运用平均波及步数法测度鄂湘赣3省之间新一代信息技术产业链的关联程度,最终得出鄂湘赣3省新一代信息技术产业基于产业链进行协同发展的对策建议。     

Determination of volatile organic compounds in industrial wastewater plant air emissions by multi-sorbent adsorption and thermal desorption-gas chromatography-mass spectrometry

This paper describes the process of determining the presence of volatile organic compounds in air emissions from industrial wastewater treatment plants (WWTP). The analytical method, based on thermal desorption-gas chromatography-mass spectrometry, was developed to simultaneously determine of 99 volatile organic compounds (VOCs) in air samples. This method is rapid, environmentally-friendly (since no organic solvents are used to extract the analytes) and compatible with a large range of thermally stable polar and apolar compounds. The target VOCs were selected on the basis of their occurrence in real samples and their adverse effects on the environment and human health. To cover the wide range of target compounds, multisorbent tubes filled with Tenax TA and Carbograph 1TD were used. Method validation showed good repeatabilities, low detection limits, a high linear range and good recoveries. At a fixed sample volume of 600?mL no significant losses for any of the target compounds were found in the samples. Stability during storage indicated that samples must be keep refrigerated at 4°C and analysed within three days of collection. Real samples were taken from air emissions of an industrial wastewater treatment plant located in the Southern Industrial Area of Tarragona (Spain) with the aim of studying its contribution as a source of atmospheric VOCs. This WWTP collects wastewater from several chemical factories which produce isocyanates, polyurethanes, chlorinated organics and functional chemicals among other products. Samples from the collecting tank after the primary sedimentation showed higher VOC concentrations than samples from the secondary treatment tank. The most abundant VOCs found in these emissions are included in the USEPA List of Hazardous Air Pollutants. The highest values correspond to acrylonitrile (up to 1843?µg?m^?3) and styrene (up to 573.70?µg?m^?3). The levels of chloroform, 1,4-dioxane, ethylbenzene, 1,2,3-trimethylbenzene and 1,4-diethylbenzene were also high.     

微波消解-电感耦合等离子体原子发射光谱法同时测定工业锅炉水中的六种金属元素

应用微波消解,电感耦合等离子体原子发射光谱法同时测定锅炉水中的钙、镁、铜、铁、铝、锌六种金属元素.对射频功率、雾化气流量、分析线进行了优化.各元素校准曲线的相关系数均在0.999 5以上,检出限在0.000 7～0.006 0 mg/L之间.样品分析结果的相对标准偏差为0.48％～6.8％,加标回收率为94.0％～105％.     

无墨喷水可重复打印纸工业化制备

“无墨喷水打印”技术因其绿色环保的特点引起了广泛关注,推进无墨喷水可重复打印纸的产业化具有重要的意义。 本文以具有水致变色性质的吲哚并[2,1-b]噁唑啉染料分子(TM)为例,选定聚对苯二甲酸乙二醇酯(PET)代替滤纸基材,通过筛选合适的表面活性剂、调整染料用量以及涂层厚度,探究并得到了一种无墨喷水可重复打印纸的工业化制备工艺。 结果表明,利用优化后的制备工艺得到的无墨喷水可重复打印纸具有良好的可重复书写性能,并通过小量生产测试验证该制备工艺可以应用于实际工业生产。     

Identification of p-Coumaric Acid and Ethyl p-Coumarate as the Main Phenolic Components of Hemp (Cannabis sativa L.) Roots

Hemp (Cannabis sativa L.) contains a variety of secondary metabolites, including cannabinoids, such as psychoactive (−)-trans-Δ⁹-tetrahydrocannabinol. The present study was conducted to identify the major phenolic components contained in hemp root, which has been relatively under-researched compared to other parts of hemp. The aqueous ethanol extract of hemp roots was fractionated into methylene chloride (MC), ethyl acetate (EA), and water (WT) fractions, and high-performance liquid chromatography with photodiode array detection (HPLC-DAD) analysis was performed. The main ultraviolet (UV)-absorbing phenolic compound contained in the EA fraction was identified as p-coumaric acid by comparing the retention time and UV absorption spectrum with a standard. Silica gel column chromatography was performed to isolate a hydrophobic derivative of p-coumaric acid contained in the MC fraction. Nuclear magnetic resonance (NMR) analysis identified the isolated compound as ethyl p-coumarate. For comparative purposes, ethyl p-coumarate was also chemically synthesized by the esterification reaction of p-coumaric acid. The content of p-coumaric acid and ethyl p-coumarate in the total extract of hemp root was estimated to be 2.61 mg g⁻¹ and 6.47 mg g⁻¹, respectively, by HPLC-DAD analysis. These values correspond to 84 mg Kg⁻¹ dry root and 216 mg Kg⁻¹ dry root, respectively. In conclusion, this study identified p-coumaric acid and ethyl p-coumarate as the main phenolic compounds contained in the hemp roots.     

全自动SPE联合离子色谱质谱法测定化工产业园区周边地表径流中氟乙酸、碘乙酸、羟基乙酸、溴酸盐和高氯酸盐微量残留

目的 实验开发了全自动SPE联合离子色谱质谱法测定化工产业园区周边地表径流中氟乙酸、碘乙酸、羟基乙酸、溴酸盐和高氯酸盐微量残留的分析方法。方法 采集化工产业园区周边地表径流水样1000 mL,置试剂瓶中,去除肉眼可见杂质,滤纸过滤,调节水样PH至近中性;取上述水样500 mL,以流速12 mL/min的速度经固相萃取柱富集、净化,最后用10 mL甲醇溶液洗脱,合并收集的洗脱液,洗脱液置氮吹至近干,用1 mL甲醇溶液溶解残渣,0.22μm滤膜过滤,上离子色谱质谱仪定性、定量检测。结果 氟乙酸、碘乙酸、羟基乙酸、溴酸盐和高氯酸盐在浓度0.005 ~2.0μg/mL范围内,线性良好;检测限分别为0.021、0.023、0.0014、0.025和0.015 μg/L;三水平加标回收率在80%~120.6%范围内;精密度(RSD)在5.0%以内。结论 此方法检出限低、准确度和精密度好,适用于化工产业园区周边地表径流水样的检测分析。     

大视场高分辨率显微工业电视镜头设计

随着CMOS、CCD探测器的广泛应用及其分辨率的不断提高,人们对电视镜头的分辨率提出了更高的要求。将显微工业电视镜头成像原理与传统显微镜进行了比较,并利用光学设计软件ZEMAX进行光学效果的模拟,给出了数值孔径为0．08,光学放大倍数为1,焦距为38mm,视场直径为8mm,全视场角为10°,分辨率为200万像素的光学系统设计结果。所设计的显微工业电视镜头可用于工业生产检测。     

Trends in industrial polymer research

In the past decades a shift in paradigm took place in industrial polymer research for structural materials. Only a few new polymers based on new monomeric building blocks were developed. The main focus is now on tailoring improved “old polymers” with well-defined structure and properties based on a set of low cost “old” monomers using controlled polymerization mechanisms.     

Alternative Synthesis of 5-(1H-Pyrazol-4-yl)-2-{6-[(2,2,6,6-tetramethylpiperidin-4-yl)oxy]pyridazin-3-yl}phenol

A scalable and environmentally benign route to the free base of branaplam, a small molecule splicing modulator, was identified and developed. This alternative approach circumvented the inherent risk of dioxin formation associated with ortho-halo phenol derivatives present in the previous route. A Friedel–Crafts approach provided a reliable access to the key intermediate, subsequently followed by a Suzuki–Miyaura cross-coupling. Multiple process aspects of the synthetic approach were evaluated, and a robust process for its large-scale synthesis was developed and successfully demonstrated.