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Increased glacier melt enhances future extreme floods in the southern Tibetan Plateau

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Advances in Climate Change Research 2024年第3期15卷 431-441页

作者： he sun Tan-Dong YAO Feng-Ge SU Tinghai Ou Zhihua he Guoqiang TANG Deliang CheN State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Regional Climate Group Department of Earth SciencesUniversity of GothenburgGothenburg 40530Sweden Centre for Hydrology University of SaskatchewanSaskatoon S7N 1K2Canada Climate and Global Dynamics National Center for Atmospheric ResearchBoulder CO 80307USA

Mountainous areas are of special hydrological concern because topography and atmospheric conditions can result in large and sudden floods,posing serious risks to water-related safety in neighbouring *** Yarlung Zangbo(YZ)River basin is the largest river basin on the Tibetan Plateau(TP),but how floods will discharge in this basin and how the role of glacier melt in floods will change throughout the 21st-century under shared socioeconomic pathways scenarios(SSP2-4.5 and SSP5-8.5)remain ***,we comprehensively address this scientific question based on a well-validated large-scale glacier-hydrology *** results indicate that extreme floods was projected to increase in the YZ basin,and was mainly reflected in increased duration(4–10 d per decade)and intensity(153–985 m^(3)s^(−1)per decade).Glacier runoff was projected to increase(2–30 mm per decade)throughout the 21st-century,but there was also a noticeable decrease or deceleration in glacier runoff growth in the late first half of the century under the SSP2-4.5,and in the latter half of the century under the *** melt was projected to enhance the duration(12%–23%)and intensity(15%–21%)of extreme floods under both SSPs,which would aggravate the impact of future floods on the socioeconomics of the YZ *** effect was gradually overwhelmed by precipitation-induced floods from glacier areas to YZ *** study takes the YZ basin as a projection framework example to help enrich the understanding of future flood hazards in basins affected by rainfall-or meltwater across the TP,and to help policy-makers and water managers develop future plans.

关键词： floods glacier Tibetan

Major parameter measurement of high-brightness injector in hefei Light Source

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Nuclear Science and Techniques 2011年第4期22卷 200-204页

作者： WANG Xiaohui he Zhigang sun Baogen JIA Qika School of Nuclear Science and Technology & National Synchrotron Radiation Laboratory University of Science and Technology of China HeJei 230029 China

A photocathode radio frequency gun,which is an S-band normal conducting 1.6 copper cell cavity with water cooling system,was installed in hefei Light *** order to know its characteristics and get it into normal operation,continuous conditioning was conducted in the last few *** charge and dark current charge were measured using integrating current *** beam transverse size was determined as 1.63 mm in minimum using YAG screen and GigE Vision *** multi-slits technique,the transverse emittance was measured and normalized at 1.95 mm·mrad with beam charge of 240 *** results provide a way to optimize the facility.

关键词：参数测量合肥光源喷油器高亮度水冷却系统电流互感器 YAG激光正常运行

改性活性炭电极用于电厂生活污水后脱氮及减碳的研究

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水处理技术 2025年第1期51卷 97-101,119页

作者：杨畅畅于海琴冯瑞琦韩溪童孙贺范思辰北京交通大学环境学院北京100044 北京交通大学计算机与信息技术学院北京100044

受传统氨氮处理工艺限制,电厂生活污水常出现氨氮难达标问题,从而需要投入大量外加碳源,这一过程会造成碳排放和处理成本的增加。本研究使用NaOH改性活性炭电极,应用在传统生活污水生物处理(AAO)之后进一步去除氨氮(后脱氮),此过程中不... 详细信息

受传统氨氮处理工艺限制,电厂生活污水常出现氨氮难达标问题,从而需要投入大量外加碳源,这一过程会造成碳排放和处理成本的增加。本研究使用NaOH改性活性炭电极,应用在传统生活污水生物处理(AAO)之后进一步去除氨氮(后脱氮),此过程中不添加任何外加碳源、除磷药剂以及深度脱氮工艺。实验结果表明,在最优操作条件:电压1.2 V、进水流量37 mL/min、初始氨氮质量浓度6.138 mg/L下,改性后氨氮去除率达到64.31%;TN、TP、电导率去除率达到45.38%、62.08%和89.38%;CDI的加入使得传统生物处理过程无需外加碳源和除磷药剂即可达到出水标准,成本下降了0.4元/m^(3),出水作为电厂回用水可节省2 000元取水费用;对吸附过程进行碳排放核算,在电厂生活污水日处理量为450 m3/d的情况下,CDI装置的加入平均每天可以减少738.25 kgCO_(2)的排放,具有良好的减碳效益。此外,该技术可推广应用于居民小区等建筑做回用水,每天可节省256元污水处理费用,并且具有同样的碳减排效益。

关键词：生活污水 CDI 后脱氮电吸附碳减排

Synthesis and Crystal Structure of a Novel Aminothiourea Derivative Bearing Sugar Moiety

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Chinese Journal of Structural Chemistry 2007年第8期26卷 945-948页

作者： JI Xiao-Ming YAN Xue-Bin sun he-Ping LIU Hong-Min College of Agriculture Henan University of Agriculture Zhengzhou 450002 China New Drug Research ＆ Development Center Zhengzhou University Zhengzhou 450052 China

5-O-Benzoyl- 1,2-O-isopropylidene- α-D-erythro-ketofuranose-3-ulose-3-aminothiose 3 was synthesized and characterized by spectral analysis, and its crystal structure was determined by X-ray diffraction analysis. The crystal belongs to orthorhombic, space group P212121 with a=6.6276（13）, b=10.993（2）, c=25.027（5）（A）, β=90°, V=1823.4（6）（A）3, Z=4, C16H20N3O5S, Mr=366.41, Dc=1.335 g/cm^3,μ=0.208 mm^-1, F（000）=772, S=1.007, the final R=0.0465 and wR=0.1061 for 3251 observed reflections （I 〉 2σ（I））. Four hydrogen bonds are observed. The absolute configuration of this molecule was confirmed by comparing with that of the original material.

关键词： synthesis crystal structure aminothiourea

Dynamically switchable porphyrin-based molecular tweezer for on-off fullerene recognition

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Chinese Chemical Letters 2024年第6期35卷 283-287页

作者： Zhimin sun Xin-Hui Guo Yue Zhao Qing-Yu Meng Li-Juan Xing he-Lue sun College of Chemistry and Materials Science Hebei Key Laboratory of Organic Functional MoleculesHebei Normal UniversityShijiazhuang 050024China

herein,a novel molecular tweezer based on 2,2'-bipyridine-bridged porphyrin subunits was constructed for efficient fullerenes *** syn conformation of the molecule,which was obtained by Zn(Ⅱ)coordination,gives rise to a proper cavity to interact with fullerene guests to form a stable 1:1 complex in toluene *** exhibits distinct binding selectivity towards C_(60)over C_(70).Moreover,the fullerene recognition capacity can be adequately suppressed by importing H_(2)PO_(4)^(-)to competitively capture Zn(Ⅱ)along with syn-anti conformational ***,the molecular tweezer regenerated to bind the fullerene by introducing the Ca^(2+)into the ***,the association-disassociation process can be switched reversibly and repeatedly.

关键词： Molecular tweezer Fullerene recognition Supramolecular chemistry Conformation conversion Coordination

Geochronology and geochemistry of the W-Mo-ore-related granitic rocks from eastern Ningzhen,lower Yangtze river belt,eastern China

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Acta Geochimica 2022年第2期41卷 288-306页

作者： Fangyue Wang Yongjie Guo Haiyang Yan Haiou Gu he sun Can Ge Present Address:School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China Ore Deposit and Exploration Center Hefei University of TechnologyHefei 230009China Anhui Institute of Geological Survey(Anhui Institute of Geological Sciences) Hefei 230001China

here we present zircon U–Pb–Hf and wholerock major and trace element studies of eastern Ningzhen W-Mo-ore-related magmatic rocks,Yushan and Longwangshan granitic rocks,to constrain their form timing,magma sources,and tectonic *** results showed that the two plutons were formed in the Early Cretaceous with;Pb/;U ages of 107.8±1.2 and 105.2±1.5 Ma(;Pb/;U),*** trapped/residual zircons are mainly distributed in 2.0–2.5 *** two intrusions are characterized by high silicon(68.60–73.99%),high aluminum(13.56–15.02%),high Mg#(47–55),high Sr,Sr/Y,LaN/YN,and low Yb,falling into high Mg#adakitic rock *** zirconεHf(t)values of the two intrusions range from-24.8 to-13.2,indicating an ancient continental crust in their magma *** average Ti-inzircon temperature is 689°C,slightly higher than those of other high-Mg adakitic rocks in the lower Yangtze River belt,but lower than those of high-Mg adakitic rocks in the Southern Tanlu Fault(STLF).Zircon Ce;/Ce;show low oxygen fugacity(LWS-1:3–400,average 92;sample ZYS-4:9–382,average 93).These geochemical features indicate a thickened lower continental crust in the Eastern Ningzhen region in a subduction *** the geochemical characteristics of the eastern Ningzhen to the western Ningzhen and other areas in the Lower Yangtze River Metallogenic Belt(LYRMB)and the high-Mg ore-barren adakitic rocks of the STLF,we propose that the magmatic rocks from eastern Ningzhen may be mainly from a thickened lower continental crust that hybridized with a very small part of mantle sources,while the west Ningzhen magmatic rocks may have experienced a higher degree of mantle contaminations in their *** metallogenic differences between the eastern(W–Mo)and western(Cu–Fe–Pb–Zn)parts of Ningzhen also indicate different proportions of crustal materials in their magma source.

关键词： Ancient lower continental crust Paleo-pacific plate High Mg#adaktic rocks Early cretaceous Ningzhen Crustal thickening

Taxonomies of Relationship Between Fiscal Capacities and Administrative Affairs of Local Governments in Chinese-Style Fiscal Federalism

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学术界 2010年第5期 252-256页

作者： he Fengyang sun Yat-sen University

New insight into fracturing characterization of shale under cyclic soft stimulation:A lab-scale investigation

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Petroleum Science 2022年第6期19卷 2830-2843页

作者： Qiang Gao Han Cao Ting Bao Jiang-Zhan Chen Huan-Xiao Hu Ping-he sun School of Geoscience and Info-Physics Central South UniversityChangsha410083HunanChina Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Ministry of Education) Central South UniversityChangsha410083HunanChina Hubei Intelligent Geological Equipment Engineering Technology Research Center Wuhan430074HubeiChina Pacific Northwest National Laboratory RichlandWA99352USA School of Resources and Safety Engineering Central South UniversityChangsha410083HunanChina

The cyclic soft stimulation(CSS)is a new method of reservoir reforming for which the mechanism of fracturing crack propagation is ambiguous with regard to the alternating fluid *** study aims to provide a comprehensive understanding of the fracturing mechanical characterizations of CSS under different magnitudes and amplitudes of the alternating fluid *** emission(AE)is recorded to investigate the damage evolution under CSS based on the b value analysis of *** results reveal the difference of pressure in a crack under different cyclic fluid pressure *** AE results show that the maximum radiated energy under CSS tends to be reduced with the increase in the amplitude and magnitude of the alternating fluid *** finishing crucial touch is that the crack extending criterion under CSS is proposed,which combines the injection parameters,the rock properties and in-situ *** to the crack extending criterion,the fluctuation fluid pressure causes the reduction of a critical crack extending pressure,and the CSS causes the crack to initiate and propagate under low fluid *** a higher-value magnitude of alternating fluid pressure,the cyclic times of CSS is less for the crack *** supplement to the crack extending criterion,a distinct relationship between the radiated energy and the cyclic fluid pressure also is established based on the energy dissipation *** new findings provide an insight into the determination of crack extending criterion under CSS for efficiently implementing shale fracturing.

关键词： Cyclic soft stimulation Fracturing mechanical characterization Damage evolution Crack extending criterion Radiated energy

Enantioselective three-component Ugi reaction catalyzed by chiral phosphoric acid

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Science China Chemistry 2020年第1期63卷 47-54页

作者： Jian Zhang Yi-Yan Wang he sun Shao-Yu Li Shao-Hua Xiang Bin Tan School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China Department of Chemistry and Shenzhen Grubbs Institute Southern University of Science and TechnologyShenzhen 518055China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China

A catalytic enantioselective three-component Ugi reaction was ***-derived phosphoric acid with bulky 2,4,6-tricyclohexylphenyl groups at the 6,6′positions was found to be the best catalyst to affordα-amino amide derivatives in good to excellent yields(62%to 99%)and enantiocontrol(81%to>99%enantiomeric excess).This asymmetric reaction was applicable well to an array of aliphatic *** gram-scale synthesis,modification of dapsone,and enantioselective synthesis of(R)-Lacosamide underline the general utility of this *** of dihedral angles and substituents of the chiral phosphoric acids on the enantioselectivity was also discussed in this article.

关键词： α-amino amide Ugi reaction chiral phosphoric acid enantioselectivity Lacosamide