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Enhancing Green Ammonia Electrosynthesis Through Tuning Sn Vacancies in Sn‑Based MXene/ MAX Hybrids

Nano-Micro Letters 2024年第5期16卷 154-168页

作者： Xinyu Dai Zhen‑Yi Du Ying sun Ping Chen Xiaoguang Duan junjun Zhang Hui Li Yang Fu Baohua Jia Lei Zhang Wenhui Fang Jieshan Qiu Tianyi Ma Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials of Liaoning Province College of ChemistryInstitute of Clean Energy ChemistryLiaoning UniversityShenyang 110036People’s Republic of China State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601People’s Republic of China School of Chemical Engineering The University of AdelaideAdelaideSA 5005Australia State Key Laboratory of High‑Efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021NingxiaPeople’s Republic of China School of Science RMIT UniversityMelbourneVIC 3000Australia Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640People’s Republic of China College of Chemical Engineering State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Renewable energy driven N_(2) electroreduction with air as nitrogen source holds great promise for realizing scalable green ammonia production.However,relevant out-lab research is still in its infancy.Herein,a novel Sn-based MXene/MAX hybrid with abundant Sn vacancies,Sn@Ti_(2)CTX/Ti_(2)SnC–V,was synthesized by controlled etching Sn@Ti_(2)SnC MAX phase and demonstrated as an efficient electrocatalyst for electrocatalytic N2 reduction.Due to the synergistic effect of MXene/MAX heterostructure,the existence of Sn vacancies and the highly dispersed Sn active sites,the obtained Sn@Ti2CTX/Ti_(2)SnC–V exhibits an optimal NH_(3) yield of 28.4μg h^(−1) mg_(cat)^(−1) with an excellent FE of 15.57% at−0.4 V versus reversible hydrogen electrode in 0.1 M Na_(2)SO_(4),as well as an ultra-long durability.Noticeably,this catalyst represents a satisfactory NH3 yield rate of 10.53μg h^(−1) mg^(−1) in the home-made simulation device,where commercial electrochemical photovoltaic cell was employed as power source,air and ultrapure water as feed stock.The as-proposed strategy represents great potential toward ammonia production in terms of financial cost according to the systematic technical economic analysis.This work is of significance for large-scale green ammonia production.

关键词： Green ammonia synthesis N2 electroreduction Renewable energy Sn MXene/MAX hybrid

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Devonian integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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Science China Earth Sciences 2024年第4期67卷 1036-1070页

作者： Wenkun QIE Kun LIANG Wen GUO Biao GAO junjun SONG Bo CHEN Pu HUANG Li QIAO Honghe XU Jitao CHEN Yucong sun Yichun ZHANG State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Nanjing 211135China

The Devonian System in the Qinghai-Tibetan Plateau and its surrounding areas is widely distributed,diverse in lithotypes and rich in fossils.It records the crucial processes of continuous subduction and reduction of the Paleo-Asian Ocean in the northern hemisphere and the transformation of the Proto-Tethys Ocean into the Paleo-Tethys Ocean in the southern hemisphere.Thus,it is of great significance for explaining the global paleogeographic evolution,tectonic activities and biodiversity changes during this critical period.The blocks on both sides of the southern Tienshan suture zone and the Longmu Co-ShuanghuChangning-Menglian suture zone belong to different sedimentary systems and paleobiogeographic realms and regions,showing important tectonic paleogeographic partitioning significance.The two suture zones represent the main branches of the PaleoAsian Ocean and the Paleo-Tethys Ocean,respectively,and on this basis the Devonian System can be subdivided into three types:the Tienshan type,the Tethys type and the Gondwana type.Based on recent research progress on the Devonian stratigraphy and paleontology in combining provenance analysis and biotic characteristics in the Qinghai-Tibetan Plateau and surrounding areas,this paper aims to establish the latest integrative stratigraphic framework and conduct paleogeographic reconstruction,providing foundation for exploring the geological evolution and dynamic mechanisms of various terranes and blocks in the northern margin of Gondwana.The results indicate that the North Qiangtang,South Qiangtang,Simao,Baoshan and Tengchong terranes,as well as the Himalaya Tethys Zone and the South China Block have affinities with the Indian Block,while the Lhasa Terrane has affinities with the Australian Block,and may be located between the South China and Australian blocks.In the Emsian(Early Devonian),the South China Block separated from the northern margin of Gondwana,a process that was accompanied by the opening of the Jinshajiang-Ailaoshan Ocean.In the Middle Devonian,the mid-oceanic

关键词： Devonian Paleo-Tethys Ocean Integrative stratigraphy Biotas Provenance Analysis Paleogeography

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Access to Financial Services——An Analysis from the Human Rights Perspective

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The Journal of Human Rights 2024年第1期23卷 173-201页

作者：孙世彦张贵军 SHEN junjun the Institute of International Law of Chinese Academy of Social Sciences the Center for Human Rights Studies Chinese Academy of Social Sciences the Tian Yuan Law Firm 不详

There is a broad connection between finance and human rights,with finance having both positive and negative impacts on human rights.Everyone has a need for access to financial services.Documents in both the international human rights and international finance fields address the relationship between financial services and human rights.Among financial services,microcredit and inclusive finance have the closest connection to human rights and potentially the greatest impact on human rights.Access to financial services promotes economic,social,and cultural rights as well as the rights of specific groups.The conditions for access to financial services to promote human rights require the state to assume obligations to recognize,respect,protect,and fulfill the need for individuals to access financial services,and to ensure the availability,accessibility,acceptability,and adaptability of basic financial services.Access to financial services has played a significant role in China’s comprehensive victory in the battle of poverty alleviation,providing valuable experience for the international community in poverty eradication,achieving sustainable development goals,and protecting and promoting human rights.

关键词： financial service human rights perspective inclusive finance poverty eradication 4A scheme

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Recent Advances in Video Coding for Machines Standard and Technologies

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ZTE Communications 2024年第1期22卷 62-76页

作者： ZHANG Qiang MEI junjun GUAN Tao sun Zhewen ZHANG Zixiang YU Li State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen 518055China ZTE Corporation Shenzhen 518057China Huazhong University of Science and Technology Wuhan 430074China

To improve the performance of video compression for machine vision analysis tasks,a video coding for machines(VCM)standard working group was established to promote standardization procedures.In this paper,recent advances in video coding for machine standards are presented and comprehensive introductions to the use cases,requirements,evaluation frameworks and corresponding metrics of the VCM standard are given.Then the existing methods are presented,introducing the existing proposals by category and the research progress of the latest VCM conference.Finally,we give conclusions.

关键词： video coding for machines VCM video compression

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Recent Advances in Video Coding for Machines Standard and Technologies

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ZTE Communications 2024年

作者： ZHANG Qiang MEI junjun GUAN Tao sun Zhewen ZHANG Zixiang YU Li Huazhong University of Science and Technology ZTE Corporation State Key Laboratory of Mobile Network and Mobile Multimedia Technology

In recent years， owing to the advancement of intelligent devices， a substantial volume of videos are provided to machines for analysis instead of humans. To improve the performance of video compression for machine vision analysis tasks， a video coding for machines (VCM) standard working group was established to promote standardization procedures. In this paper， we present recent advances of video coding for machine standards， and give a comprehensive introduction about the use cases， requirements， evaluation framework and corresponding metrics of the VCM standard. Then we present the existing methods， introducing the existing proposals by category and the research progress of the latest VCM conference. Finally， we give conclusions.

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Advances in selective catalytic oxidation of ammonia (NH_(3)-SCO): A review of catalyst structure-activity relationship and design principles

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Chinese Chemical Letters 2024年第1期35卷 169-180页

作者： Zhao Li Chunxue Wang junjun Qiu Yixing Ma Chi Wang Xin sun Kai Li Ping Ning Fei Wang Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming 650500China Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China

NH_(3) in ambient air directly leads to an increase in the aerosol content in the air. These substances lead to the formation of haze to various environmental problems after atmospheric circulation and diffusion. Controlling NH_(3) emissions caused by ammonia escaping from mobile and industrial sources can effectively reduce the NH_(3) content in ambient air. Among the various NH_(3) removal methods, the selective catalytic oxygen method (NH_(3)-SCO) is committed to oxidizing NH_(3) to environmentally harmless H_(2)O and N_(2);therefore, it is the most valuable and ideal ammonia removal method. In this review, the characteristics of loaded and core-shell catalysts in NH_(3)-SCO have been reviewed in the context of catalyst structure-activity relationships, and the H_(2)O resistance and SO2 resistance of the catalysts are discussed in the context of practical application conditions. Then the effects of the valence state of the active center, oxygen species on the catalyst surface, dispersion of the active center and acidic sites on the catalyst performance are discussed comprehensively. Finally, the shortcomings of the existing catalysts are summarized and the catalyst development is discussed based on the existing studies.

关键词： Ammonia Selective catalytic oxidation Active metals and supports Influence of gas composition Reaction mechanism Catalyst structure-activity relationship

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自旋轨道耦合Su-Schrieffer-Heeger模型的量子相变

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山西大学学报(自然科学版) 2024年第3期47卷 583-590页

作者：孙文奇梁军军山西大学理论物理研究所

本文研究了粒子间短程排斥相互作用和自旋轨道耦合效应对SSH (Su-Schrieffer-Heeger)模型量子相与相变的影响。利用密度矩阵重整化群方法（Density-matrix Renormalization Group Method, DMRG）分析了粒子数密度分布、密度结构因子、... 详细信息

本文研究了粒子间短程排斥相互作用和自旋轨道耦合效应对SSH (Su-Schrieffer-Heeger)模型量子相与相变的影响。利用密度矩阵重整化群方法（Density-matrix Renormalization Group Method, DMRG）分析了粒子数密度分布、密度结构因子、纠缠熵和纠缠谱等，在弱相互作用区间，不同自旋轨道耦合参数下存在数目不一样的非平庸拓扑边缘态，而随着相互作用的增强，系统手征对称自发破缺，在自旋轨道耦合强度和相互作用的高值区域，出现密度波相。最后确定了相边界进而得到相图。用密度结构因子刻画该模型的拓扑相变点时，发现在小尺寸下，密度结构因子峰值在相变点存在突变，而当系统尺寸足够大时，突变消失，峰值呈现出奇异性。

关键词：超冷费米气体自旋轨道耦合密度波相拓扑

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超声监测子宫内膜厚度在稽留流产术后应用雌激素提高妊娠率中的评估价值

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中国基层医药 2024年第3期31卷 432-436页

作者：沈俊君孙红丹罗小芳慈溪市妇幼保健院超声科慈溪315300 慈溪市妇幼保健院妇科慈溪315300

目的分析稽留流产术后应用雌激素超声监测子宫内膜厚度在提高妊娠率中的临床价值。方法回顾性选取2022年1月至2023年6月在慈溪市妇幼保健院进行稽留流产吸刮宫术的患者86例为研究对象,按照不同治疗方式分为对照组、观察组各43例。对照... 详细信息

目的分析稽留流产术后应用雌激素超声监测子宫内膜厚度在提高妊娠率中的临床价值。方法回顾性选取2022年1月至2023年6月在慈溪市妇幼保健院进行稽留流产吸刮宫术的患者86例为研究对象,按照不同治疗方式分为对照组、观察组各43例。对照组术后予常规治疗,不采用任何药物治疗,观察组术后予雌激素治疗。比较两组临床疗效、子宫内膜厚度、宫腔粘连情况及再次妊娠率。结果观察组子宫内膜厚度在组间、交互以及时间作用上差异均有统计学意义(F组间=129.49,F交互=14.25,F时间=146.64,均P<0.001),宫腔粘连情况优于对照组(χ^(2)=4.34,P<0.05),观察组临床有效率[88.37%(38/43)比69.76%(30/43)]、再次妊娠率显著优于对照组[46.54%(20/43)比13.95%(6/43)],差异均有统计学意义(Z=2.35,P=0.019,χ^(2)=10.81,P<0.05)。结论稽留流产患者术后应用雌激素治疗,对子宫内膜厚度改善显著,对促进月经恢复、减少宫腔粘连具有积极作用,有利于提高再次妊娠率,临床价值较高。

关键词：超声检查流产,稽留子宫内膜雌二醇妊娠率

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丙泊酚镇静体外循环下心脏瓣膜置换术后谵妄发生的影响因素分析

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新乡医学院学报 2024年第1期41卷 65-70页

作者：杜守峰师文华孙君隽韩冬南阳市中心医院心脏大血管外科河南南阳473009

目的探讨丙泊酚镇静体外循环(CPB)下心脏瓣膜置换术后谵妄发生的影响因素。方法选择2020年1月至2022年12月于南阳市中心医院行CPB下心脏瓣膜置换术患者152例为研究对象,依据丙泊酚镇静深度将患者分为观察A组[50≤脑电双频指数(BIS)0.05)... 详细信息

目的探讨丙泊酚镇静体外循环(CPB)下心脏瓣膜置换术后谵妄发生的影响因素。方法选择2020年1月至2022年12月于南阳市中心医院行CPB下心脏瓣膜置换术患者152例为研究对象,依据丙泊酚镇静深度将患者分为观察A组[50≤脑电双频指数(BIS)0.05);年龄、慢性阻塞性肺疾病、术前心功能不全、过度疼痛、术后LVEF、CPB时间与患者术后谵妄发生相关(P<0.05)。多因素logistic回归分析显示,年龄≥60岁、术前心功能不全、过度疼痛、CPB时间≥100 min是患者术后谵妄发生的危险因素(P<0.05),术后LVEF≥50%、丙泊酚镇静深度35≤BIS<45是患者术后谵妄发生的保护因素(P<0.05)。结论丙泊酚镇静深度为35≤BIS<45、术后LVEF≥50%可有效降低患者CPB下心脏瓣膜置换术后谵妄的发生风险,年龄≥60岁、术前心功能不全、过度疼痛、CPB时间≥100 min会增加患者术后谵妄的发生风险。

关键词：丙泊酚镇静深度体外循环心脏瓣膜置换术术后谵妄

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新能源汽车碳减排潜力分析

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北京理工大学学报 2024年第2期44卷 111-122页

作者：王震坡詹炜鹏孙逢春邓钧君崔丁松黎小慧北京理工大学机械与车辆学院电动车辆国家工程研究中心北京100081

在“碳达峰、碳中和”双碳目标驱动下,新能源汽车凭借其碳减排优势受到了广泛关注.旨在促进新能源汽车碳减排潜力评估的相关研究,从新能源汽车碳排放计量与分析、车网协同优化低碳运行、车辆碳排放总量态势预测等三个方面进行分析与综述... 详细信息

在“碳达峰、碳中和”双碳目标驱动下,新能源汽车凭借其碳减排优势受到了广泛关注.旨在促进新能源汽车碳减排潜力评估的相关研究,从新能源汽车碳排放计量与分析、车网协同优化低碳运行、车辆碳排放总量态势预测等三个方面进行分析与综述,归纳了相关领域最新研究成果,总结各类建模方法优缺点,重点阐述了汽车节能减排核算体系与行业碳排放管理体系等相关成果,并提出新能源汽车碳减排潜力分析研究的发展趋势及未来研究方向.

关键词：新能源汽车碳排放减排潜力

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