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Effect of succinic acid on morphology transformation of the anhydrous magnesium carbonate particles prepared by magnesium chloride hexahydrate and urea

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Particuology 2024年第7期90卷 209-217页

作者： song Liu guojun Cheng Zhongfeng Tang School of Materials Science and Engineering Anhui University of Science and TechnologyHuainan232001China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Anhui Province Key Laboratory of Environment-friendly Polymer Materials Anhui UniversityHefei230601China

The homogeneous and controllable morphology of anhydrous magnesium carbonate(MgCO_(3))particles with excellent properties is difficult to obtain because of a variety of synthetic *** effect of succinic acid as a crystal modifier on the particle morphology transformation of anhydrous MgCO_(3)was investigated by the hydrothermal *** effect of the addition of succinic acid on the particles was similar to that of temperature *** morphology of particles with a folded diamond-like shape was gradually uniform,and the particle size was between 3.3 and 7.5μ*** MgCO_(3)particles prepared at pH 9 could easily agglomerate,and the average particle size increased from diamond-like to cube-like as the reaction time *** interaction between succinic acid and magnesium ions at different concentrations was the main factor responsible for the morphological *** pH,temperature,and time affected the molecular motion rate and crystal growth.

关键词： MgCO_(3) MgCl_(2)·6H_(2)O Urea Succinic acid Morphology

Quantificational Etching of AAO Template

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Journal of Materials Science & Technology 2007年第3期23卷 427-429页

作者： guojun song Dong CHEN Zhi PENG Xilin SHE Jianjiang LI Ping HAN Institute of Polymer Materials Qingdao University Qingdao 266071 China

Ni nanowires were prepared by electrodeposition in porous anodized aluminum oxide （AAO） template from a composite electrolyte solution. Well-ordered Ni nanowire arrays with controllable length were then made by the partial removal of AAO using a mixture of phosphoric acid and chromic acid （6 wt pct H3PO4：1.8 wt pct H3CrO4）. The images of Ni nanowire arrays were studied by scanning electron microscopy （SEM） to determine the relationship between etching time and the length of Ni nanowire arrays. The results indicate that the length of nanowires exposed from the template can be accurately controlled by controlling etching time.

关键词： Nanowire arrays Anodized aluminum oxide (AAO) Controllable etching

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原发性失眠患者MRI研究进展

现代医用影像学 2024年第3期33卷 580-584页

作者：邓吉飞宋国军许添全南华大学附属南华医院放射科湖南衡阳421000

原发性失眠是指无特定的心理、生理或物质相关原因,患者难以入睡或难以维持睡眠,常伴有白天精神及能力严重受损。近年来原发性失眠患者数量不断增加,从而引起了广泛关注,国内外研究者应用最新的磁共振成像(magnetic resonance imaging,M... 详细信息

原发性失眠是指无特定的心理、生理或物质相关原因,患者难以入睡或难以维持睡眠,常伴有白天精神及能力严重受损。近年来原发性失眠患者数量不断增加,从而引起了广泛关注,国内外研究者应用最新的磁共振成像(magnetic resonance imaging,MRI)方法对原发性失眠的神经生物学机制进行了大量研究。目前磁共振技术在原发性失眠的研究方面不仅包括已经逐步应用于临床的磁共振氢质子波谱成像、弥散张量成像、三维动脉自旋标记技术,还包括仍处于研究状态的结构性核磁共振成像、功能性核磁共振成像,本文将就上述核磁共振成像技术对原发性失眠的研究进展进行综述。

关键词：原发性失眠核磁共振成像综述

Combining TDLAS and multi-fusion algorithms for methane gas concentration detection

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Optoelectronics Letters 2024年第6期20卷 353-359页

作者： SHI guojun song Xinmin DONG Taiji School of Information&Electrical Engineering Heilongjiang Bayi Agricultural UniversityDaqing 163319China College of Electrical and Information Engineering Northeast Petroleum UniversityDaqing 163318China

High-precision methane gas detection is of great importance in industrial safety, energy production and environmental protection, etc. However, in the existing measurement techniques, the methane gas concentration information is susceptible to noise, which leads to its useful signal being drowned by noise. A fusion algorithm of variational modal decomposition(VMD) and improved wavelet threshold filtering is proposed, which is used in combination with tunable diode laser absorption spectroscopy(TDLAS) to implement a non-contact, high-resolution methane gas concentration detection. The fusion algorithm can perform noise reduction and further segmentation of the methane gas detection signal. And the simulation and experiment verify the effectiveness of the fusion algorithm, and the experimental results show that for the detection of air containing 10 ppm, 30 ppm, 60 ppm, 80 ppm, and 99 ppm methane, the errors are 12.75%, 8.18%, 3.37%, 2.46%, and 1.78%, respectively.

关键词： Combining TDLAS and multi-fusion algorithms for methane gas concentration detection TDLAS

Water pollution control planning for the Taizi River watershed

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Journal of Environmental Sciences 1996年第1期8卷 110-119页

作者： Jiang Weigong Sun Hong(Benxi Environmental Monitoring Station, Liaoning Province ,Benxi 117021,China)Guo Huaicheng song guojun (Center for Environmental Sciences,Peking University.Beijing 100871.China) Benxi Envmtl Stat Liaoning Province Benxi China China

Water pollution control planning for the Taizi River watershed,a typical Chinese case study,is presented in this paper. Based on comprehensive *** quality in the watershed was assessed and predicated;water quality models for the river and reservoir were built;and function of water bodies and environmental assimilative capacity were determined ;and then the planning for industrial pollution sources and concentrated sewage treatment were made respectively.

关键词： water pollution control planning water quality model benefit-cost analysis.

碳纳米管与石墨烯对NBR/EUG复合材料结构与性能的影响

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特种橡胶制品 2024年第4期45卷 27-32页

作者：曹建莉李伟张喜俊高建张舒铭徐龙宇刘智涛王虓然宋国君河北省橡塑油封创新中心衡水053515 高科橡塑工业有限公司衡水053515 青岛大学材料科学与工程学院青岛266000

将碳纳米管(CNT)和石墨烯分别加入丁腈橡胶NBR/杜仲橡胶EUG复合材料中,研究了碳纳米管和石墨烯对NBR/EUG复合材料硫化特性、拉伸性能、分散性及损耗因子的影响。结果表明:随着CNT和石墨烯用量的增加,硫化胶的M_(H)、M_(L)及M_(H)-M_(L)... 详细信息

将碳纳米管(CNT)和石墨烯分别加入丁腈橡胶NBR/杜仲橡胶EUG复合材料中,研究了碳纳米管和石墨烯对NBR/EUG复合材料硫化特性、拉伸性能、分散性及损耗因子的影响。结果表明:随着CNT和石墨烯用量的增加,硫化胶的M_(H)、M_(L)及M_(H)-M_(L)升高,焦烧时间和硫化时间缩短;加入CNT和石墨烯在复合材料中形成纳米通道,提高了其在复合材料中的分散性;CNT使复合材料的损耗因子(tanδ)峰值下降,在0℃以上时tanδ随着CNT用量的增加而增大;加入石墨烯对复合材料的tanδ影响不大。

关键词：丁腈橡胶杜仲橡胶碳纳米管石墨烯

河北省城市水资源利用绩效评估与需水量估算研究

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环境科学学报 2018年第7期38卷 2909-2918页

作者：何伟宋国君中国人民大学国家发展与战略研究院北京100872 中国人民大学环境学院北京100872

从公共服务部门标杆管理思想出发,构建了2007—2014年中国地级以上城市水资源利用效率标杆体系,并以此为评估依据,对河北省地级以上城市2007—2014年水资源利用效率展开评估,识别各个城市万元GDP水耗、万元工业总产值水耗、人均综合水... 详细信息

从公共服务部门标杆管理思想出发,构建了2007—2014年中国地级以上城市水资源利用效率标杆体系,并以此为评估依据,对河北省地级以上城市2007—2014年水资源利用效率展开评估,识别各个城市万元GDP水耗、万元工业总产值水耗、人均综合水耗和人均生活水耗在全国所有地级以上城市和不同类型范围城市中的具体位置和变化趋势;并在此基础上对城市水资源利用效率标杆体系进行历史趋势外推,将标杆预测结果作为河北省各城市节水效率管理目标,结合河北省人口数量增长和社会经济发展规划目标,估算了"十三五"期末2020年河北省地级以上城市需水量,以期为指导河北省地级以上城市"以水定城"发展战略的制定提供参考依据.结果显示:河北省唐山市、沧州市、廊坊市万元GDP水耗一直处于全国先进水平;仅沧州市万元工业总产值水耗一直处于全国先进水平;保定市、沧州市和衡水市的人均综合水耗一直处于全国先进水平;保定市、沧州市、张家口市、石家庄市、秦皇岛市、邢台市的人均生活水耗一直处于全国先进水平;预计到"十三五"期末,河北省地级以上城市市辖区工业需水总量减少为8.81亿m^3,居民生活需水量增加为4.26亿m^3,城市总用水量增加为16.94亿m^3.

关键词：水资源利用效率标杆需水量估算河北省

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论中国污染物排放总量控制和浓度控制

环境保护 2000年第6期28卷 11-13页

作者：宋国君中国人民大学环境经济研究所北京100872

本文分析了总量控制和浓度控制的概念 ,从政策角度对总量控制作了定义 ,从多方面对总量控制和浓度控制这两种环境管理方法体系进行了比较 ,并讨论了总量控制的实施战略和政策效果。

关键词：总量控制浓度控制污染物排放中国

Environmental Planning and Management Development

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Environmental Planning and Management Development