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Molecular engineering binuclear copper catalysts for selective CO_(2) reduction to C_(2) products

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Journal of Energy Chemistry 2024年第6期93卷 166-173,I0005页

作者： Qi Zhao Kai Lei Bao Yu xia Rachel Crespo-Otero Devis Di Tommaso Department of Chemistry School of Physical and Chemical SciencesQueen Mary University of LondonLondonE14NSUK Key Laboratory of Material Chemistry for Energy Conversion and Storage(Ministry of Education) Hubei Key Laboratory of Material Chemistry and Service FailureState Key Laboratory of Materials Processing and Die&Mould TechnologySchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)Wuhan 430074HubeiChina Department of Chemistry University College LondonLondonWC1H 0AJUK Digital Environment Research Institute Queen Mary University of LondonEmpire HouseLondon E11HHUK

Molecular copper catalysts serve as exemplary models for correlating the structure-reaction-mechanism relationship in the electrochemical CO_(2) reduction(eCO_(2)R),owing to their adaptable environments surrounding the copper metal *** investigation,employing density functional theory calculations,focuses on a novel family of binuclear Cu molecular *** modulation of their coordination configuration through the introduction of organic groups aims to assess their efficacy in converting CO_(2) to C_(2)*** findings highlight the crucial role of chemical valence state in shaping the characteristics of binuclear Cu catalysts,consequently influencing the eCO_(2)R behaviour,Notably,the Cu(Ⅱ)Cu(Ⅱ)macrocycle catalyst exhibits enhanced suppression of the hydrogen evolution reaction(HER),facilitating proton trans fer and the eCO_(2)R *** rthermore,we explo re the impact of diverse electro n-withdrawing and electron-donating groups coordinated to the macrocycle(R=-F,-H,and-OCH_3)on the electron distribution in the molecular *** placement of-OCH_3 groups in the macrocycles leads to a favourable oxidation state of the Cu centres and subsequent C-C coupling to form C_(2) *** research provides fundamental insights into the design and optimization of binuclear Cu molecular catalysts for the electrochemical conversion of CO_(2) to value-added C_(2) products.

关键词： Molecular catalyst design Selective CO_(2)reduction C_(2)products Density functional theory calculations

Estimating shear strength of high-level pillars supported with cemented backfilling using the HoekeBrown strength criterion

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 454-469页

作者： Kaizong xia Congxin Chen Xiumin Liu Yue Wang Xuanting Liu Jiahao Yuan State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

Deep metal mines are often mined using the high-level pillars with subsequent cementation backfilling(HLSCB)mining *** the design stage,it is therefore important to have a reasonable method for determining the shear strength of the high-level pillars(*** and internal friction angle)when they are supported by cemented *** this study,a formula was derived for the upper limit of the confining pressure σ3max on a high-level pillar supported by cemented backfilling in a deep metal mine.A new method of estimating the shear strength of such pillars was then proposed based on the Hoek eBrown failure *** analysis indicates that the horizontal stress σhh acting on the cemented backfill pillar can be simplified by expressing it as a constant value.A reasonable and effective value for σ3max can then be *** value of s3max predicted using the proposed method is generally less than 3 *** this range,the shear strength of the high-level pillar is accurately calculated using the equivalent MohreCoulomb *** proposed method can effectively avoid the calculation of inaccurate shear strength values for the high-level pillars when the original HoekeBrown criterion is used in the presence of large confining pressures,*** situation in which the cohesion value is too large and the friction angle is too small can effectively be *** proposed method is applied to a deep metal mine in China that is being excavated using the HLSCB *** shear strength parameters of the high-level pillars obtained using the proposed method were input in the numerical *** numerical results show that the recommended level heights and sizes of the high-level pillars and rooms in the mine are rational.

关键词： Deep metal mines High-level pillars HoekeBrown strength criterion Cemented backfilling Confining pressure Shear strength

Impairment of Autophagic Flux After Hypobaric Hypoxia Potentiates Oxidative Stress and Cognitive Function Disturbances in Mice

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Neuroscience Bulletin 2024年第1期40卷 35-49页

作者： Shuhui Dai Yuan Feng Chuanhao Lu Hongchen Zhang Wenke Ma Wenyu Xie Xiuquan Wu Peng Luo Lei Zhang Fei Fei Zhou Fei xia Li Department of Neurosurgery Xijing HospitalFourth Military Medical UniversityXi'an 710000China National Translational Science Center for Molecular Medicine and Department of Cell Biology Fourth Military Medical UniversityXi'an 710000China Department of Neurosurgery The Central Hospital of BaojiBaoji 721000China Department of Ophthalmology Xijing HospitalFourth Military Medical UniversityXi'an 710000China

Acute hypobaric hypoxic brain damage is a potentially fatal high-altitude *** plays a critical role in ischemic brain injury,but its role in hypo-baric hypoxia(hh)remains *** we used an hh chamber to demonstrate that acute hh exposure impairs autophagic activity in both the early and late stages of the mouse brain,and is partially responsible for hh-induced oxidative stress,neuronal loss,and brain *** autophagic agonist rapamycin only promotes the initiation of *** proteome analysis,a screen showed that protein dynamin2(DNM2)potentially regulates autophagic *** of DNM2 significantly increased the formation of autolysosomes,thus maintaining autophagic flux in combination with ***,the enhancement of autophagic activity attenuated oxidative stress and neurological deficits after hh *** results contribute to evidence supporting the conclusion that DNM2-mediated autophagic flux represents a new therapeutic target in hh-induced brain damage.

关键词： Autophagy-Proteomics Oxidative stress Hypobaric hypoxia-Brain injury

基于SKD-hh分段级联器件与GPHS的RTG输出性能计算

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电源技术 2024年第4期48卷 743-748页

作者：何虎夏时雨武伟名桑雨柔中国原子能科学研究院核技术综合研究所北京102413

Pu-238放射性同位素温差发电器(RTG)在深空探测中具有广泛应用。基于先进热电材料CoSb_(3)填充方钴矿和半赫斯勒材料,设计了六π对构型分段级联器件。在此基础上,结合通用模块化热源GPHS,设计了一种面向深空应用的80 W级RTG,采用有限元... 详细信息

Pu-238放射性同位素温差发电器(RTG)在深空探测中具有广泛应用。基于先进热电材料CoSb_(3)填充方钴矿和半赫斯勒材料,设计了六π对构型分段级联器件。在此基础上,结合通用模块化热源GPHS,设计了一种面向深空应用的80 W级RTG,采用有限元软件Ansys计算了其在深空环境温度下的电性能输出和温度分布。该RTG最大输出功率80.3 W,转换效率8.36%,设计转换效率达到了美国eMMRTG的水平。

关键词： RTG 分段级联器件有限元计算

豫东地区专业村人-地-业时空耦合状态与动态特征

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河南大学学报（自然科学版） 2024年第1期54卷 1-14页

作者：姬晓雅乔家君夏兴刘齐张楠河南大学地理与环境学院/黄河中下游数字地理技术教育部重点实验室河南开封475004

乡村在国家发展中占据重要地位,为实现乡村振兴,需要准确把握乡村系统本身和乡村各子系统之间的关系,探究子系统发展中相互影响的逻辑关系.基于2008年和2017年豫东18个县级单元调研数据,构建系统耦合协调发展的评价指标体系,对研究区内... 详细信息

乡村在国家发展中占据重要地位,为实现乡村振兴,需要准确把握乡村系统本身和乡村各子系统之间的关系,探究子系统发展中相互影响的逻辑关系.基于2008年和2017年豫东18个县级单元调研数据,构建系统耦合协调发展的评价指标体系,对研究区内各研究单元子系统的空间变化特征进行实证分析.结果显示:研究区整体人-地-业3系统综合评价指数略有下降;3系统耦合协调水平均值为0.5243,土地-产业双系统之间的耦合协调关系成为影响3系统耦合协调发展的关键;所处阶段类型覆盖了轻度失调至中级协调5类,县域单元间耦合协调水平差距增大,空间差异性显著,呈现多中心的空间格局;豫东地区人口要素子系统的发展水平与整体耦合协调水平不匹配;研究时段内研究区全局自相关显著,2008年和2017年局部空间自相关水平分析结果分别呈现出hh、HL集聚和HL集聚现象.

关键词：豫东地区专业村人-地-业耦合协调时空演变

儿童休克并发缺氧性肝炎234例的临床特征及其危险因素

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实用医学杂志 2024年第15期40卷 2126-2132页

作者：郑君吴琪晔曾霞雷智贤张笃飞海南省妇女儿童医学中心儿科海口570000

目的探讨儿童休克并发缺氧性肝炎(hh)的临床特征及其危险因素。方法收集2016年1月至2023年12月收治的234例不同类型的儿童休克患者的临床资料,包括休克患儿的一般情况、临床情况及预后情况;收集休克患儿发生hh的第1(d1)、2(d2)、3(d3)、... 详细信息

目的探讨儿童休克并发缺氧性肝炎(hh)的临床特征及其危险因素。方法收集2016年1月至2023年12月收治的234例不同类型的儿童休克患者的临床资料,包括休克患儿的一般情况、临床情况及预后情况;收集休克患儿发生hh的第1(d1)、2(d2)、3(d3)、5(d5)、7(d7)天的相关血清生化指标,包括血清谷丙转氨酶(ALT)、谷草转氨酶(AST)、乳酸脱氢酶(LDH)、碱性磷酸酶(ALP)、白蛋白(ALB)、总胆红素(TBIL)、尿素氮(BUN)、C反应蛋白(CRP)、国际标准化时间(INR)及乳酸等指标。对其合并hh的临床特征及其危险因素进行分析。结果234例儿童休克患者中,男150例,女84例,年龄1个月至16岁;按休克是否并发hh,将患儿分为hh组(32例)与非hh组(202例),休克导致hh的总患病率为13.7%(32/234);脓毒性休克是休克并发hh的主要类型,占65.63%(21/32);按预后情况,将休克并发hh的患儿分为存活组(17例)与死亡组(15例),休克并发hh病死率为46.9%(15/32);hh患儿的ALT、AST值在正常范围上限的20倍以上。休克并发hh存活组患儿的酶学指标的峰值出现在发病的d1~d2,于发病的d7接近正常范围,而休克并发hh死亡组患儿的酶学指标在整个疾病期间均高。死亡组与存活组比较,死亡组的ALT、AST、ALP、TBIL、CRP、BUN、INR的峰值均高于存活组(Phh的危险因素(Phh患儿死亡的危险因素(Phh;病情愈重、左心室射血功能愈差的休克伴hh患儿预后愈差;休克并发hh的患儿病死率较高,因此应密切监测肝功能指标以期早期发现hh,给予合理救治。

关键词：休克缺氧性肝炎儿童危险因素

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多途径观察医务人员手卫生依从性的比较研究

中国感染控制杂志 2024年第9期23卷 1163-1166页

作者：潘小满吴奕宏李霞杨黎铭申丽君铜仁市妇幼保健院院内感染控制科贵州铜仁553400 铜仁市妇幼保健院办公室贵州铜仁553400 铜仁市妇幼保健院医务科贵州铜仁553400

目的了解隐蔽式观察法调查手卫生依从性的现况,比较医务人员隐蔽式观察法与直接观察法及监控观察法获取的手卫生依从率,为进一步提高手卫生依从性提供有效监测方法及手段。方法收集某院监控观察法、隐蔽式观察法、直接观察法获取的手卫... 详细信息

目的了解隐蔽式观察法调查手卫生依从性的现况,比较医务人员隐蔽式观察法与直接观察法及监控观察法获取的手卫生依从率,为进一步提高手卫生依从性提供有效监测方法及手段。方法收集某院监控观察法、隐蔽式观察法、直接观察法获取的手卫生依从性数据及手卫生用品消耗量,观察人员均经统一培训,探讨3种方法与手卫生消耗量的相关性。结果不同观察法获取的手卫生依从率差异有统计学意义(χ^(2)=17.401,P<0.001);直接观察法手卫生依从率最高,为95.08%;隐蔽式观察法手卫生依从率最低,为50.83%。新生儿科手卫生用品消耗量最高,为119.14 mL/床日,儿科手卫生用品消耗量最低,为10.39 mL/床日。监控观察法(r=0.975,P=0.005)与隐蔽式观察法(r=0.949,P=0.012)与手卫生用品消耗量具有较好相关性,隐蔽式观察法显示手卫生依从率最高的科室为新生儿科,为90.00%。结论可采用综合监控观察法及手卫生用品每床日消耗量的方法,间接反映真实的手卫生依从性。

关键词：隐蔽式观察法监控观察法手卫生依从性相关性

Influence of Surface-functionalized Graphene Oxide on the Cell Morphology of Poly(methyl methacrylate) Composite

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Journal of Materials Science & Technology 2015年第5期31卷 463-466页

作者： Yuwei Wang xia Liao Yong Luo Qi Yang Guangxian Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan University Analytical and Testing Center Sichuan University

The surface chemistry of filler is closely related to the structure and morphology of nanocomposite *** the property of filler is widely used to control the cell structures and functionalize the composite ***-functionalized graphene oxide（GO-ODA） was prepared by grafting octadecylamine（ODA） on the surface of graphene oxide（GO） to make the filler disperse better in the nanocomposites and have a strong interfacial interaction with polymer ***（methyl methacrylate）（PMMA）/GO-ODA nanocomposite foams were obtained by solution blending and foamed using supercritical carbon dioxide（scCO2）.Compared to neat PMMA and PMMA/GO samples,the PMMA/GO-ODA nanocomposite foams showed improved cell structures with smaller size,higher cell density and more homogeneous distribution,which should be attributed to the heterogeneous nucleation caused by well-dispersed GO-ODA *** work not only improved the compatibility and interfacial interaction of GO with polymer matrix but also indicated that the modified GO sheets can act as ideal filler to control the cell density,size and size distribution efficiently.

关键词： Graphene oxide Functionalization Supercritical car

肺癌合并慢性阻塞性肺疾病手术患者预康复的研究进展

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护理学杂志 2024年第9期39卷 25-29页

作者：徐小燕莫新霞张舒夏秋月毛燕君同济大学医学院上海200092 上海市肺科医院护理部

预康复通过多种术前优化的干预措施可减少患者的围术期应激反应,加速患者术后康复。通过文献回顾对肺癌合并慢性阻塞性肺疾病患者预康复措施、预康复应用于临床护理实践中的障碍与促进因素进行综述,旨在为肺癌并存慢性阻塞性肺疾病患者... 详细信息

预康复通过多种术前优化的干预措施可减少患者的围术期应激反应,加速患者术后康复。通过文献回顾对肺癌合并慢性阻塞性肺疾病患者预康复措施、预康复应用于临床护理实践中的障碍与促进因素进行综述,旨在为肺癌并存慢性阻塞性肺疾病患者实施针对性干预,促进术后快速康复、减少术后肺部并发症提供参考。

关键词：肺癌慢性阻塞性肺疾病手术患者预康复加速康复外科康复护理综述文献