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Utilizing N-hydroxy-9-octadecenamide as a collector in flotation separation of bastnaesite and fluorite

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Journal of Rare Earths 2024年第8期42卷 1620-1628,I0008页

作者： Zhihao Guo Sultan Ahmed Khoso mengjie Tian Wei sun School of Minerals Processing and Bioengineering Central South UniversityChangsha410083China State Key Laboratory of Mineral Processing Beijing102600China Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources Wuhan430081China Key Laboratoryof Hunan Province for Cleanand Efficient Utilization of Strategic Calcium-containing Mineral Resources Central South UniversityChangsha410083China Department of Mining Engineering Mehran University of Engineering&TechnologyJamshoro76062Pakistan

Bastnaesite((Ce,La,Pr,Nd)CO_(3)F) is a significant light rare earth mineral found in nature,known for its fine-grained *** is commonly employed for the recovery of fine-grained bastnaesite *** serve as an essential flotation reagent that enhance the surface hydrophobicity of target minerals.A novel collector,N-hydroxy-9-octadecenamide(N-OH-9-ODA),was synthesised in this study.N-OH-9-ODA exhibits superior selectivity compared to the traditional collector oleic acid in the flotation separation of bastnaesite and *** experimental and co mputational results indicate that N-OH-9-ODA exhibits superior selectivity due to its higher adsorption affinity for bastnaesite surface compared to fluorite *** zeta potential and the binding energies of the Ce 3d peaks in the X-ray photoelectron spectrum(XPS) of bastnaesite surface exhibit significant ***,fluorite surface demonstrates minimal alterations in its zeta potential and the binding energies of the Ca 2p peaks in its XPS after its interaction with N-OH-9-ODA.

关键词： Bastnaesite Collector Hydroxamic acids N-hydroxy-9-octadecenamide Oleic acid Rare earths

Monitoring and evaluation of the water quality of the Lower Neches River, Texas, USA

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Water Science and Engineering 2024年第1期17卷 21-32页

作者： Qin Qian mengjie He Frank sun Xinyu Liu Department of Civil and Environmental Engineering Lamar UniversityBeaumontTX 77710USA Department of Industry Engineering Lamar UniversityBeaumontTX 77710USA Department of Computer Science Lamar UniversityBeaumontTX 77710USA

Increasing bacteria levels in the Lower Neches River caused by Hurricane Harvey has been of a serious *** study is to analyze the historical water sampling measurements and real-time water quality data collected with wireless sensors to monitor and evaluate water quality under different hydrological and hydraulic *** statistical and Pearson correlation analysis on historical water samples determines that alkalinity,chloride,hardness,conductivity,and pH are highly correlated,and they decrease with increasing flow rate due to *** flow rate has positive correlations with Escherichia coli,total suspended solids,and turbidity,which demonstrates that runoff is one of the causes of the elevated bacteria and sediment loadings in the *** correlation between *** and turbidity indicates that turbidity greater than 45 nephelometric turbidity units in the Neches River can serve as a proxy for *** to indicate the bacterial outbreak.A series of statistical tools and an innovative two-layer data smoothing filter are developed to detect outliers,fill missing values,and filter spikes of the sensor *** correlation analysis on the sensor data illustrates that the elevated sediment/bacteria/algae in the river is either caused by the first flush rain and heavy rain events in December to March or practices of land use and land ***,utilizing sensor measurements along with rainfall and discharge data is recommended to monitor and evaluate water quality,then in turn to provide early alerts on water resources management decisions.

关键词： Water quality Pearson correlation analysis Lower Neches River YSI wireless sensors Non-point pollution

Atomically Dispersed Zinc Active Sites Efficiently Promote the Electrochemical Conversion of N_(2) to NH_(3)

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Energy & Environmental Materials 2024年第3期7卷 175-181页

作者： Yanjiao Wei Xinyu Wang mengjie sun Min Ma Jian Tian Minhua Shao School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong 999077China Energy Institute and Chinese National Engineering Research Center for Control&Treatment of Heavy Metal PollutionThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong China

At present,the research on highly active and stable nitrogen reduction reaction catalysts is still challenging work for the electrosynthesis of ammonia(NH_(3)).Herein,we synthesized atomically dispersed zinc active sites supported on N-doped carbon nanosheets(Zn/NC NSs)as an efficient nitrogen reduction reaction catalyst,which achieves a high ammonia yield of 46.62μg h^(-1)mg^(-1)_(cat).at-0.85 V(vs RHE)and Faradaic efficiency of 95.8%at-0.70 V(vs RHE).In addition,Zn/NC NSs present great stability and selectivity,and there is no significant change in NH_(3)rate and Faradaic efficiencies after multiple *** structural characterization shows that the active center in the nitrogen reduction reaction process is the Zn-N_(4)sites in the *** calculation confirms that Zn/NC with Zn-N_(4)configuration has a lower energy barrier for the formation of^(*)NNH intermediate compared with pure N-doped carbon nanosheets(N-C NSs),thus promoting the hydrogenation kinetics in the whole nitrogen reduction reaction process.

关键词： electrocatalysis nitrogen reduction single-atom catalyst Zn-N_(4)

Design and validation of a variable camber wing structure

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Chinese Journal of Aeronautics 2024年第2期37卷 1-11页

作者： Xiasheng sun Jingfeng XUE Jin ZHOU Zhigang WANG Wenjuan WANG mengjie ZHANG Chinese Aeronautical Establishment Beijing 100012China School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Aircraft Strength Research Institute of China Xi’an 710065China Graduate School of Chinese Aeronautical Establishment Yangzhou 225002China

Variable camber wing technology is one of the important development trends of green aviation at *** smooth,seamless,continuous and adaptive change of wing camber,the aerodynamic performance is improved in achieving increase in lift and reduction in resistance and *** on the aerodynamic validation model CAE-AVM,Chinese Aeronautical Establishment(CAE)has carried out the design and validation of a variable camber wing,proposed an aerodynamic deformation matrix for the leading and trailing edges of aircraft wings in takeoff,landing and cruise *** structures and driving schemes are compared,and several key technology problems of leading and trailing edge deformation are solved.A full-size leading edge wind tunnel test piece with a span of 2.7 m and a trailing edge ground function test piece are *** deformation and shape maintenance capabilities of the leading edge is verified under real wind load conditions,and the load bearing and deformation capabilities of the trailing edge is verified under simulated follow-on *** results indicate that the leading and trailing edges of the variable camber wing can achieve the required deformation angle and have a certain load-bearing *** study can provide some insights into the application of variable camber wing technology for civil aircraft.

关键词： Variable camber wing Leading edge Trailing edge Structure Measurement and control Test

Well-designed g-C_(3)N_(4)nanosheet incorporated Ag loaded Er_(0.05)La_(0.95)FeO_(3)heterojunctions for isoamyl alcohol detection

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Journal of Advanced Ceramics 2024年第6期13卷 736-745页

作者： Kaichun Xu mengjie Han Zichen Zheng Zexin Yu Hanlin Liao Hui sun Chao Zhang College of Mechanical Engineering Yangzhou UniversityYangzhou 225127China Institute for Manufacturing Technologies of Ceramic Components and Composites(IMTCCC) University of StuttgartStuttgart 70569Germany ICB UMR 6303 CNRSUniv.Bourgogne Franche-ComtéUTBMBelfort 90010France School of Space Science and Physics Shandong UniversityWeihai 264209China

Because the volatile content of isoamyl alcohol increases sharply on the seventh day of wheat mildew infection,isoamyl alcohol can be used as an early biomarker of wheat mildew ***,only a few sensors for isoamyl alcohol detection have been reported,and these sensors still suffer from low sensitivity and poor moisture ***,the isoamyl alcohol sensitivity of 5 at%Er@LaFeO_(3)(ELFO)was enhanced by loading Ag nanoparticles on the surface of the ELFO microspheres,while the optimal operating temperature was *** moisture resistance of Ag/ELFO was improved by the incorporation of g-C_(3)N_(4)nanosheets(NSs)on the surface of Ag/ELFO through electrostatic *** the requirements for practical applications in grain granaries,the sensing behavior of a Ag/ELFO-based sensor incorporating g-C_(3)N_(4)NSs at 20%relative humidity(RH)was systematically studied,and the sensor demonstrated excellent repeatability,long-term stability,and superior selectivity(791 at 50 ppm)for isoamyl alcohol with a low limit of detection(LOD=75 ppb).Furthermore,the practical results obtained for wheat at different mildew stages further confirmed the potential of the g-C_(3)N_(4)/Ag/ELFO-based sensor for monitoring the early mildew stage of *** work may offer guidance for enhancing the moisture resistance of gas-sensitive materials through the strategy of employing composite nanomaterials.

关键词： Ag gas sensor moisture resistance isoamyl alcohol Er@LaFeO_(3)(ELFO) g-C_(3)N_(4)nanosheet(NS)

Effects of dual antiplatelet therapy de-escalation on the prognosis of acute coronary syndrome patients at high risk of ischemia who underwent percutaneous coronary intervention

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Chinese Medical Journal 2024年第6期137卷 746-748页

作者： Jingyao Wang Yachao Li mengjie Lei Yanli yang Haiyan Gao Xiangjin Wang Lei An Haili Zhou Xue sun Cairong Li Zhigang Zhao Zengming Xue Department of Cardiology Langfang People’s HospitalHebei Medical UniversityLangfang Core Laboratory of Precision Treatment of Coronary Artery DiseaseLangfangHebei 065000China

To the Editor:Current guidelines recommend that for patients with acute coronary syndrome(ACS)undergoing percutaneous coronary intervention(PCI),dual antiplatelet therapy(DAPT),preferably involving powerful P2Y_(12) receptor inhibitors,including ticagrelor or prasugrel,should be used for at least 12 months.^([1–3])However,there is a lack of relevant evidence regarding the feasibility of de-escalation treatment and specific DAPT treatment regimens for ACS patient populations with high ischemic risk.

关键词： coronary patients acute

基于版画的清初期苏州女性服饰时尚与个性化分析

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服装学报 2024年第3期9卷 250-258页

作者：孙梦婕鲁海峰湖州师范学院艺术学院浙江湖州313000

清初的苏州版画作为珍贵的历史文化资料,展现了当时女性服饰的多样性与个性化。采用内容分析法,结合对清初苏州版画中女性服饰元素的图像分析和内容解读,探究清初苏州女性服饰的时尚特征及个性化表现。结果表明,苏州女性服饰的个性化趋... 详细信息

清初的苏州版画作为珍贵的历史文化资料,展现了当时女性服饰的多样性与个性化。采用内容分析法,结合对清初苏州版画中女性服饰元素的图像分析和内容解读,探究清初苏州女性服饰的时尚特征及个性化表现。结果表明,苏州女性服饰的个性化趋势源于经济繁荣和社会观念的变革。在经济独立和社会地位提升的背景下,苏州女性在时尚选择上表现出更大的自主性和多样性,版画中的云肩、水田衣等服饰元素不仅是时尚的象征,更反映了她们在社会地位、文化传统和个人身份认同上的表达。这些发现不仅为理解当时社会文化提供了重要线索,也深化了对女性时尚与社会文化互动关系的认识。

关键词：清初期苏州版画女性服饰

1例初始表现为急性弥散性血管内凝血的胃低分化腺癌伴多发转移:^(18)F-FDG PET/CT显像所见

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中国医学影像技术 2024年第4期40卷 634-635页

作者：杨红杰孙倩刘军王子阳胡疏董孟杰北京大学深圳医院核医学科广东深圳518036 北京大学深圳医院病理科广东深圳518036

患者女,20岁,无明显诱因阵发性下腹部疼痛伴牙龈出血、皮肤散在瘀斑及肛门坠胀感9天;既往体健。查体:贫血貌,全身皮肤散在片状瘀斑,四肢皮肤干燥;腹部柔软,无压痛及反跳痛。实验室检查:红细胞2.49×10^(12)/L,血小板36×10^(9)/L,血红蛋... 详细信息

患者女,20岁,无明显诱因阵发性下腹部疼痛伴牙龈出血、皮肤散在瘀斑及肛门坠胀感9天;既往体健。查体:贫血貌,全身皮肤散在片状瘀斑,四肢皮肤干燥;腹部柔软,无压痛及反跳痛。实验室检查:红细胞2.49×10^(12)/L,血小板36×10^(9)/L,血红蛋白70 g/L,血浆鱼精蛋白副凝固实验(+),D-二聚体>20 mg/L,纤维蛋白原降解产物>150.00 mg/L,糖类抗原12573.40 U/ml。

关键词：弥散性血管内凝血胃肿瘤体层摄影术,X线计算机正电子发射断层显像

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生物降解塑料制品指纹数据一致性评价研究

塑料工业 2024年第1期52卷 101-106页

作者：孙梦捷赵镭王永香上海市质量监督检验技术研究院上海201114

针对目前国内外生物降解塑料产品指纹数据库研究和应用的短缺,以及市场对于生物降解材料一致性验证的需求,建立生物降解塑料产品指纹数据库和一致性评价方法。通过采集各种生物降解塑料产品的红外光谱分析(FTIR)、差示扫描量热(DSC)和... 详细信息

针对目前国内外生物降解塑料产品指纹数据库研究和应用的短缺,以及市场对于生物降解材料一致性验证的需求,建立生物降解塑料产品指纹数据库和一致性评价方法。通过采集各种生物降解塑料产品的红外光谱分析(FTIR)、差示扫描量热(DSC)和热重分析(TG)指纹信息,建立生物降解塑料产品指纹数据库,通过指纹数据有效性研究,将指纹数据库应用于生物降解塑料产品一致性评价。本文通过优化指纹采集条件并研究指纹数据有效性,建立了生物降解塑料产品一致性判定准则。通过本研究可以开展生物降解塑料产品一致性评价工作,为广大企业提供质量控制技术服务,为监管部门提供一致性监管技术支持,并为后续开展生物降解产品认证打下基础,具有重要的现实意义。

关键词：生物降解塑料制品指纹一致性评价