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Dramatic Difference Between Cu_(20)H_(8)and Cu_(20)H_(9)Clusters in Catalysis

CCS Chemistry 2024年第6期6卷 1581-1590页

作者： Chun-Yu Liu Tong-Yu Liu Zong-Jie Guan song Wang Yuan-Yuan Dong Feng Hu De-en Jiang Quan-ming Wang Department of Chemistry Engineering Research Center of Advanced Rare Earth Materials(Ministry of Education)Tsinghua UniversityBeijing 100084 Jiangsu Engineering Research Centre for Digital Textile Inkjet Printing Key Laboratory of Eco-Textile Jiangnan UniversityMinistry of EducationWuxiJiangsu 214122 Department of Chemical and Biomolecular Engineering Vanderbilt UniversityNashvilleTennessee 37235 Department of Chemistry Vanderbilt UniversityNashvilleTennessee 37235 College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082 Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefeiAnhui 230026

Sensitivity to structure and composition is very challenging to establish in nanocatalysis due to inadequate definition of structures that are very close in *** synthesized a pair of atomically precise copper clusters that are very close in composition,[Cu_(20)H_(9)(Tf-dpf)_(10)]·BF4(Cu_(20)H_(9))and[Cu_(20)H_(8)(Tf-dpf)_(10)]·(BF_(4))_(2)(Cu_(20)H_(8)),by using a pyridyl-functionalized flexible amidinate ligand,N,N′-di(5-trifluoromethyl-2-pyridyl)*** one-hydride difference in their composition leads to significant variation in geometric and electronic structures and,consequently,distinctly different optical and catalytic ***_(20)H_(8)exhibits 25 times higher catalytic activity than Cu_(20)H_(9)(96.7%vs 3.7%in yield)in the selective hydrogenation of anα,β-unsaturated aldehyde(cinnamaldehyde)to saturated aldehyde(3-phenylpropanal).Electrospray ionization mass spectrometry combined with density functional theory calculations reveal that the greater ease of dissociation of one Tf-dpf ligand compared to Cu_(20)H_(8)is the key to its higher *** work demonstrates a clear case of structure and composition sensitivity in nanocatalysis and that one hydride,out of∼330 atoms in the nanoclusters,can make a huge difference in the catalytic *** insights will be useful in the design and synthesis of atomically precise nanocatalysts.

关键词： copper cluster hydride amidinate ligand structural transformation hydrogenation catalysis

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红外和拉曼光谱在金属氢化物结构分析中的应用

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光谱学与光谱分析 2018年第1期38卷 8-14页

作者：陈淼彭述明周晓松龙兴贵傅依备中国工程物理研究院核物理与化学研究所四川绵阳621900

红外光谱和拉曼光谱是分析金属氢化物结构的强有力工具,通过红外、拉曼光谱分析并结合理论计算,可以获得二元(MgH2,CaH2,AlH3)和三元(Mg2FeH6)金属氢化物中金属原子与氢原子局域成键环境信息,从而鉴别金属氢化物不同的相结构,还可以获... 详细信息

红外光谱和拉曼光谱是分析金属氢化物结构的强有力工具,通过红外、拉曼光谱分析并结合理论计算,可以获得二元(MgH2,CaH2,AlH3)和三元(Mg2FeH6)金属氢化物中金属原子与氢原子局域成键环境信息,从而鉴别金属氢化物不同的相结构,还可以获得三元金属氢化物M2RuH6(M=Ca,Sr,Eu)中由于金属原子的不同而导致的结构差异,以及三元金属氢化物与其氘化物的结构差异。利用原位拉曼光谱分析技术分析高压或高温下金属氢化物的形成与分解反应过程,可以获得金属氢化物在高压加载及卸压过程中的结构变化,更好的理解金属氢化物的衍射数据。PAIR(photoacoustic infrared spectroscopy)光谱技术增强了红外活性和拉曼活性组合谱带的强度,从而避免了空气及潮湿环境对傅里叶红外变换光谱实验结果的影响。红外光谱和拉曼光谱用于金属氚化物的结构分析,获得金属氢化物中金属原子与氢同位素原子局域成键环境的差异,更好的研究氢同位素效应。而且,拉曼光谱已被成功用于分析氢同位素混合气体的组成。因此,将金属氢化物结构的红外和拉曼光谱分析与氢同位素气体组分的拉曼光谱分析相结合,可用于研究金属与氢同位素气体反应的动力学过程及同位素效应。

关键词：金属氢化物红外拉曼结构

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Short-form OPA1 is a molecular chaperone in mitochondrial intermembrane space

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Science China(Life Sciences) 2022年第2期65卷 227-235页

作者： Deyang Yao Yukun Li Sheng Zeng Zhifan Li Zahir Shah Bigui song Jinglei Liu yi Wu Liang Yang Qi Long Wenqian Wang Zhijuan Hu Haite Tang Xingguo Liu School of Life Sciences University of Science and Technology of ChinaHefei 230027China Bioland Laboratory(Guangzhou Regenerative Medicine and Health Guangdong Laboratory) CAS Key Laboratory of Regenerative BiologyJoint School of Life SciencesGuangzhou Institutes of Biomedicine and HealthChinese Academy of SciencesGuangzhou Medical UniversityGuangzhou 510530China Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine Institute for Stem Cell and RegenerationGuangzhou Institutes of Biomedicine and HealthUniversity of Chinese Academy of SciencesChinese Academy of SciencesGuangzhou 510530China Centre for Regenerative Medicine and Health Hong Kong Institute of Science&InnovationChinese Academy of SciencesHong Kong SARChina

Mitochondria,double-membrane organelles,are known to participate in a variety of metabolic and signal transduction *** intermembrane space(IMS)of mitochondria is proposed to subject to multiple damages emanating from the respiratory *** optic atrophy 1(OPA1),an important protein for mitochondrial fusion,is cleaved into soluble short-form(S-OPA1)under *** we report that S-OPA1 could function as a molecular chaperone in *** purified the S-OPA1(amino acid sequence after OPA1 isoform 5 S1 site)protein and showed it protected substrate proteins from thermally and chemically induced aggregation and strengthened the thermotolerance of Escherichia coli(***).We also showed that S-OPA1 conferred thermotolerance on IMS proteins,e.g.,*** chaperone activity of S-OPA1 may be required for maintaining IMS homeostasis in mitochondria.

关键词： mitochondria OPA1 chaperone mitochondrial homeostasis heat shock

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Neuroprotection on ischemic brain injury by Mg^(2+)/H_(2) released from endovascular Mg implant

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Bioactive Materials 2024年第12期42卷 124-139页

作者： Yang Zhang Hongkang Zhang Miaowen Jiang Xiaofeng Cao Xiaoxiao Ge Baoying song Jing Lan Wenhao Zhou Zhengfei Qi Xuenan Gu Juzhe Liu Yufeng Zheng ming Li Xunming Ji Department of Neurology and Neurosurgery Xuanwu HospitalCapital Medical UniversityBeijing100053China China-America Institute of Neuroscience and Beijing Institute of Geriatrics Xuanwu HospitalCapital Medical UniversityBeijing100053China School of Materials Science and Engineering Peking UniversityBeijing100871China Beijing Institute for Brain Disorders Capital Medical UniversityBeijing100069China Biomaterials Research Center Northwest Institute for Non-ferrous Metal ResearchXi’an710016China School of Bioengineering Beihang UniversityBeijing100191China The Key Laboratory of Resources and Environmental System Optimization Ministry of EducationCollege of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing100096China

***,due to ischemia-reperfusion injury,over half of these patients still experience poor ***,neuroprotective treatment is imperative to alleviate the ischemic brain injury,and a proof-of-concept study was conducted on“biodegradable neuroprotective stent”.This concept is premised on the hypothesis that locally released Mg^(2+)/H_(2) from Mg metal within the bloodstream could offer synergistic neuroprotection against reperfusion injury in distant cerebral ischemic ***,the study evaluated pure Mg’s neuroactive potential using oxygen-glucose deprivation/reoxygenation(OGD/R)injured neuron ***,a pure Mg wire was implanted into the common carotid artery of the transient middle cerebral artery occlusion(MCAO)rat model to simulate human brain ischemia/reperfusion *** vitro analyses revealed that pure Mg extract aided mouse hippocampal neuronal cell(HT-22)in defending against OGD/R ***,the protective effects of the Mg wire on behavioral abnormalities,neural injury,blood-brain barrier disruption,and cerebral blood flow reduction in MCAO rats were ***,Mg-based biodegradable neuroprotective implants could serve as an effective local Mg^(2+)/H_(2) delivery system for treating distant cerebral ischemic diseases.

关键词： Magnesium Acute ischemic stroke Neuroprotection Biodegradable implantation Hydrogen

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搅拌摩擦加工对压铸ADC10合金显微组织与力学性能的影响

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铸造 2023年第10期72卷 1317-1321页

作者：宋福林匡益明长沙航空职业技术学院湖南长沙410124 湖南信息学院湖南长沙410151

压铸ADC10铝合金中存在多种第二相颗粒,特别是含铁相第二相会导致其延展性大幅降低,从而影响了其结构应用。通过对ADC10合金铸态组织进行适当的改性,可以提高合金的力学性能。本文研究并分析了搅拌摩擦加工(FSP)对压铸ADC10合金显微组... 详细信息

压铸ADC10铝合金中存在多种第二相颗粒,特别是含铁相第二相会导致其延展性大幅降低,从而影响了其结构应用。通过对ADC10合金铸态组织进行适当的改性,可以提高合金的力学性能。本文研究并分析了搅拌摩擦加工(FSP)对压铸ADC10合金显微组织及力学性能的影响:搅拌摩擦加工能有效地细化合金的铸态组织,分解粗大的Si颗粒,在α-Al基体中形成了均匀细小的等轴Si颗粒。此外,搅拌摩擦加工消除了作为裂纹源的孔隙等缺陷及破碎第二相颗粒,从而提高了合金的力学性能和延展性。

关键词： ADC10铝合金搅拌摩擦加工显微组织力学性能压铸

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Vector soliton and noise-like pulse generation using a Ti3C2 MXene material in a fiber laser

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Frontiers of Information Technology & Electronic Engineering 2021年第3期22卷 318-324页

作者： Shuai WANG Lei LI Yu-feng song Ding-yuan TANG De-yuan SHEN Lu-ming ZHAO Jiangsu Key Laboratory of Advanced Laser Materials and Devices Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging IndustrySchool of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics International Institute of Microscale OptoelectronicsInternational Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationShenzhen UniversityShenzhen 518060China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore Kunshan Shunke Laser Technology Co. Ltd.Suzhou 215300China

We built a Tm:Ho co-doped fiber laser using a Ti3C2 MXene material as a saturable absorber(SA).The formation of vector solitons(VSs)and noise-like pulses(NLPs)was *** SA was prepared by dripping a Ti3C2 solution on a side-polished D-shaped fiber and then naturally *** VS is characterized by two coexisting sets of Kelly *** modulating the polarization controller in the fiber laser,NLPs with about 3.3 nm bandwidth can be switched from the *** the best of our knowledge,this is the first time that VSs have been generated in a fiber laser using a Ti3C2 MXene material as the SA.

关键词： Vector soliton Noise-like pulse MXene Laser fiber

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Surgical intervention combined with weight-bearing walking training improves neurological recoveries in 320 patients with clinically complete spinal cord injury:a prospective self-controlled study

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Neural Regeneration Research 2021年第5期16卷 820-829页

作者： Yansheng Liu Jia-Xin Xie Fang Niu Zhexi Xu Pengju Tan Caihong Shen Hongkun Gao song Liu Zhengwen Ma Kwok-Fai So Wutian Wu Chen Chen Sujuan Gao Xiao-ming Xu Hui Zhu Kunming International Spine and Spinal Cord Injury Treatment Center Kunming Tongren HospitalKunmingYunnan ProvinceChina Clinical Center for Spinal Cord Injury Kunming General Hospital of Chengdu Military CommandKunmingYunnan ProvinceChina Department of Laboratory Animal Sciences Shanghai Jiao Tong University School of MedicineShanghaiChina Department of Ophthalmology and State Key Laboratory of Brain and Cognitive Sciences The University of Hong KongHong Kong Special Administration RegionChina Guangdong-Hongkong-Macao Institute for Central Nervous System Regeneration Jinan UniversityGuangzhouGuangdong ProvinceChina Re-Stem Biotechnology Co.Ltd.SuzhouJiangsu ProvinceChina Spinal Cord and Brain Injury Research Group Stark Neurosciences Research InstituteDepartment of Neurological SurgeryIndiana University School of MedicineIndianapolisINUSA Department of Biostatistics Indiana University School of MedicineIndianapolisINUSA

Although a large number of trials in the SCI field have been conducted,few proven gains have been realized for *** the present study,we determined the efficacy of a novel combination treatment involving surgical intervention and long-term weight-bearing walking training in spinal cord injury(SCI)subjects clinically diagnosed as complete or American Spinal Injury Association Impairment Scale(AIS)Class A(AIS-A).A total of 320 clinically complete SCI subjects(271 male and 49 female),aged 16–60 years,received early(≤7 days,n=201)or delayed(8–30 days,n=119)surgical interventions to reduce intraspinal or intramedullary *** days post-surgery,all subjects received a weight-bearing walking training with the“Kunming Locomotion Training Program(KLTP)”for a duration of 6 *** neurological deficit and recovery were assessed using the AIS scale and a 10-point Kunming Locomotor Scale(KLS).We found that surgical intervention significantly improved AIS scores measured at 15 days post-surgery as compared to the pre-surgery baseline *** improvement of AIS scores was detected at 3 and 6 months and the KLS further showed significant improvements between all pair-wise comparisons of time points of 15 days,3 or 6 months indicating continued improvement in walking scores during the 6-month *** conclusion,combining surgical intervention within 1 month post-injury and weight-bearing locomotor training promoted continued and statistically significant neurological recoveries in subjects with clinically complete SCI,which generally shows little clinical recovery within the first year after injury and most are permanently *** study was approved by the Science and Research Committee of Kunming General Hospital of PLA and Kunming Tongren Hospital,China and registered at ***(Identifier:NCT04034108)on July 26,2019.

关键词： American Spinal Injury Association Impairment Scale–A functional recovery human intramedullary decompression spinal cord injury surgical intervention walking training

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自动驾驶对沥青面层寿命及养护成本影响分析

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中国公路学报 2022年第10期35卷 125-134页

作者：宋明涛陈丰同济大学道路与交通工程教育部重点实验室上海201804 广东华路交通科技有限公司广东广州510545

自动驾驶车辆具有鲁棒的横向控制稳定性与居中车道行驶偏好,这将显著影响车辆轮迹横向分布。集中的轮迹分布将加速沥青路面车辙发展,应合理利用自动驾驶车辆横向控制,量化轮迹横向分布对路面车辙发展以及建设养护成本的影响。以浙江上... 详细信息

自动驾驶车辆具有鲁棒的横向控制稳定性与居中车道行驶偏好,这将显著影响车辆轮迹横向分布。集中的轮迹分布将加速沥青路面车辙发展,应合理利用自动驾驶车辆横向控制,量化轮迹横向分布对路面车辙发展以及建设养护成本的影响。以浙江上三高速为对象,利用视频观测现阶段车道横断面车辆横向分布状态并测量路面车辙深度,提取了车辆横向分布基准参数;据此设计了几种轮迹分布函数并构建轮迹横向分布实施流程;通过室内试验采集材料参数,建立上三高速路面结构有限元仿真模型,分析了不同自动驾驶车辆比例以及横向分布函数下沥青罩面使用年限以及年均建设养护成本。研究结果表明:按照现阶段自动驾驶车辆小于10 cm的横向分布标准差,当车辆全部自动化后,路面车辙达到15 mm的年限将由11年多提前至8年,上三高速沥青罩面年均建设养护成本将增加37.4%(达到49.9万元/km)。随着横向分布标准差的逐渐增长,自动驾驶车辆的不利作用将会逐渐减弱;当其值大于25 cm时,自动驾驶车辆将有利于减缓路面车辙发展进程,且此时自动驾驶车辆的比例越高,减缓效果越明显;均匀分布状态下,路面车辙年限将推迟约3年(升至14年),年均建设养护成本将减少约24.2%(降至27.6万元/km)。因此,合理控制自动驾驶车辆轮迹横向分布将有效降低沥青面层建设养护成本。

关键词：道路工程路面养护成本有限元自动驾驶轮迹横向分布

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晶须和相变复合增韧陶瓷的复合增韧模型

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无机材料学报 1998年第2期13卷 195-200页

作者：宋桂明周玉孙毅雷廷权哈尔滨工业大学材料学院433信箱哈尔滨150001

建立了晶须和相变复合增韧陶瓷的复合增韧模型，其中晶须增韧考虑了裂纹桥联和裂纹偏转两种机理；相变增韧在考虑体膨胀作用的基础上，用切应变影响因子来考虑切应变增韧效应．计算结果表明，相变增韧、桥联增韧和裂纹偏转增韧存在相干... 详细信息

建立了晶须和相变复合增韧陶瓷的复合增韧模型，其中晶须增韧考虑了裂纹桥联和裂纹偏转两种机理；相变增韧在考虑体膨胀作用的基础上，用切应变影响因子来考虑切应变增韧效应．计算结果表明，相变增韧、桥联增韧和裂纹偏转增韧存在相干性，相变增韧降低晶须增韧效果，而晶须增韧促进相变增韧效果，SiCw／ZrO2（2mol％Y2O3）／Al2O3断裂韧性的计算结果与实验结果吻合．

关键词：晶须增韧相变增韧复合材料复合陶瓷陶瓷材料

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电流馈电式半桥荧光灯镇流器的建模及设计

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电机与控制学报 2015年第9期19卷 40-45页

作者：王青松程明东南大学电气工程学院江苏南京210096

针对电流馈电式半桥荧光灯电子镇流器的产品设计过程无理论可循、仅仅依靠工程经验试凑参数的问题,探讨了镇流器稳态运行时影响灯管寿命的关键因素,基于等效分析法和相量法建立了拓扑的等效模型并推导了相关公式,提出了电路中关键元件... 详细信息

针对电流馈电式半桥荧光灯电子镇流器的产品设计过程无理论可循、仅仅依靠工程经验试凑参数的问题,探讨了镇流器稳态运行时影响灯管寿命的关键因素,基于等效分析法和相量法建立了拓扑的等效模型并推导了相关公式,提出了电路中关键元件参数的理论计算方法。在不改变电路拓扑的情况下,通过优化设计电路参数,可在保证系统原有性能的基础上进一步减小灯电流的波峰系数(crest factor,CF),通过仿真及实验验证了所建模型及理论计算的准确性,最后通过对比说明经建模后得出的新参数使得灯电流的CF低于原设计,从而有效缓解灯电流对灯管寿命的影响,提高了系统的可靠性。

关键词：拓扑建模参数设计荧光灯电子镇流器电流馈电式波峰系数

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