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HFC-134a热催化降解的实验与机理研究

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工程热物理学报 2024年第4期45卷 935-941页

作者：张凯许云婷王天浩戴晓业史琳清华大学能源与动力工程系北京100084 清华大学热科学与动力工程教育部重点实验室北京100084

2021年9月《蒙特利尔议定书》基加利修正案对我国正式生效,我国在未来三十年左右将面临严峻的HFCs淘汰任务,因此实现淘汰HFCs的高效率、低能耗降解至关重要。传统的高温焚烧工艺存在能耗高、成本高的特点,因此本研究关注于制冷剂热催化... 详细信息

2021年9月《蒙特利尔议定书》基加利修正案对我国正式生效,我国在未来三十年左右将面临严峻的HFCs淘汰任务,因此实现淘汰HFCs的高效率、低能耗降解至关重要。传统的高温焚烧工艺存在能耗高、成本高的特点,因此本研究关注于制冷剂热催化降解方法,选取主要的HFCs类制冷剂HFC-134a为研究对象,通过实验手段和量子化学计算方法探究HFCs制冷剂的热催化方案可行性,并分析了催化剂种类、温度和氧气比例等关键因素对制冷剂降解效果的影响。

关键词： HFC-134a 热催化降解热催化剂影响因素分解机理

Software-Defined Multi-Mode Access Management in Cellular V2X

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Journal of Communications and Information Networks 2021年第3期6卷 224-236页

作者： Haibo Zhou Ting Ma yunting xu Nan Cheng Xiaolin Yan School of Electronic Science and Engineering Nanjing UniversityNanjing 210023China School of Telecommunication Engineering and the State Key Laboratory of ISNXidian UniversityXi'an 710071China

With the rapid development of vehicular access network,three different communication modes have emerged as the fundamental technologies in cellular V2X,i.e.,cellular mode,reuse mode,and dedicated mode,through different spectrum sharing ***,how to conduct the multi-mode access management for cellular V2X is challenging considering the heterogeneity of network resource and the diverse vehicular services *** this paper,we investigate a software defined multi-mode access management framework in cellular V2X,which is capable of providing flexibility and programmability for dynamic spectrum sharing in vehicular *** first conduct the performance analysis of multi-mode communications in cellular ***,we design an analytic hierarchy process(AHP)based evolutionary game to optimize the multi-mode access management solution,in which four performance indicators are jointly considered,including transmission rate,interference,transmission delay,and energy *** experimental simulations have validated the superiority of the proposed algorithm,and illustrated the impact of different vehicle access schemes,signal-to-interference-plus-noise ratio(SINR)threshold and other parameters on the performance of cellular V2X.

关键词： cellular V2X SDN cellular mode reuse mode dedicated mode evolutionary game

Plant-based meat analogues aggravated lipid accumulation by regulating lipid metabolism homeostasis in mice

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Food Science and Human Wellness 2024年第2期13卷 946-960页

作者： yunting Xie Linlin Cai Zhiji Huang Kai Shan Xinglian xu Guanghong Zhou Chunbao Li Key Laboratory of Meat Processing and Quality Control MOEKey Laboratory of Meat ProcessingMARAJiangsu Innovative Center of Meat ProductionProcessing and Quality ControlCollege of Food Science and TechnologyNanjing Agricultural UniversityNanjing 210095China

To determine the effects of plant-based meat analogues on the metabolic health and the possible mechanisms,mice were fed with a real pork diet(AP),a real beef diet(AB),a plant-based pork analogue diet(PP)and plant-based beef analogue diet(PB)for 68 *** with real meat,the plant-based meat analogues increased food and energy intake,body weight,white fat and liver weight and caused adipocyte hypertrophy,hepatic lipid droplet accumulation,and inflammatory responses in *** revealed that plantbased meat analogues altered the composition of serum metabolites,which regulated lipid metabolism *** PB diet upregulated gene expression related to lipid synthesis,lipolysis and adipocyte differentiation while the PP diet upregulated expression of lipolysis-related genes but downregulated expression of adipocyte differentiation-related genes in white adipose ***,both PP and PB diets upregulated lipid influx-and synthesis-related genes but downregulated lipid oxidation-related genes in *** specific metabolite biomarkers may affect fat accumulation mainly by direct lipid metabolism pathways or indirect amino acid metabolism,protein digestion and absorption,bile secretion,aminoacyl-tRNA biosynthesis,neuroactive ligand-receptor interaction and ABC transporters *** findings provide a new insight into understanding the differences in nutritional functions of meat and plant-based meat analogues.

关键词： Meat analogues Metabolomics Lipid metabolism Adipose tissue dysfunction Ectopic fat deposition

Mg/Fe site-specific dual-doping to boost the performance of cobalt-free nickle-rich layered oxide cathode for high-energy lithium-ion batteries

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Journal of Energy Chemistry 2024年第4期91卷 670-679页

作者： yunting Wang Gaohui Du Di Han Wenhao Shi Jiahao Deng Huayu Li Wenqi Zhao Shukai Ding Qingmei Su Bingshe xu Materials Institute of Atomic and Molecular Science Shaanxi University of Science and TechnologyXi'an 710021ShanxiChina Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024ShanxiChina Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

Layer-type LiNi0.9Mn0.1O2is promising to be the primary cathode material for lithium-ion batteries(LIBs)due to its excellent electrochemical ***,the cathode with high nickel content suffers from severely detrimental structural transformation that causes rapid capacity ***,site-specific dual-doping with Fe and Mg ions is proposed to enhance the structural stability of *** Fe3+dopants are inserted into transition metal sites(3b)and can favorably provide additional redox potential to compensate for charge and enhance the reversibility of anionic *** Mg ions are doped into the Li sites(3a)and serve as O_(2)^(-)-Mg^(2+)-O_(2)^(-)pillar to reinforce the electrostatic cohesion between the two adjacent transition-metal layers,which further suppress the cracking and the generation of harmful phase transitions,ultimately improving the *** theoretical calculations,including Bader charge and crystal orbital Hamilton populations(COHP)analyses,confirm that the doped Fe and Mg can form stable bonds with oxygen and the electrostatic repulsion of O_(2)^(-)-O_(2)^(-)can be effectively suppressed,which effectively mitigates oxygen anion loss at the high delithiation *** dual-site doping strategy offers new avenues for understanding and regulating the crystalline oxygen redox and demonstrates significant potential for designing high-performance cobalt-free nickel-rich cathodes.

关键词： Cobalt-free Layered oxide Cathode Dual dopants Density functional theory calculation

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废弃制冷剂降解方法研究现状及思考

化工学报 2021年第S1期72卷 1-6页

作者：戴晓业安青松许云婷史琳清华大学能源与动力工程系北京100084 天津大学机械工程学院天津300072

部分人工合成制冷剂由于存在环保问题,目前正按照环保公约进行淘汰。淘汰后的废弃制冷剂需要进行降解销毁,我国是目前国际上主要的制冷剂生产和消费国,因此面临着巨大的废弃制冷剂销毁压力。总结归纳了废弃制冷剂目前主要的降解方法,包... 详细信息

部分人工合成制冷剂由于存在环保问题,目前正按照环保公约进行淘汰。淘汰后的废弃制冷剂需要进行降解销毁,我国是目前国际上主要的制冷剂生产和消费国,因此面临着巨大的废弃制冷剂销毁压力。总结归纳了废弃制冷剂目前主要的降解方法,包括焚烧热解法、等离子法、催化分解法等技术路线的研究进展,并对未来可能的发展方向进行思考与讨论。

关键词：废弃制冷剂热解催化光催化催化剂

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HFC-134a氧化热解的机理和实验研究

制冷学报 2023年第3期44卷 29-40页

作者：许云婷张凯戴晓业史琳清华大学能源与动力工程系热科学与动力工程教育部重点实验室北京100084

我国面临巨大HFCs制冷剂销毁压力,亟需研究高效且温和的HFCs制冷剂降解方法。本文结合实验与量子化学计算,以典型HFCs制冷剂HFC-134a为研究对象,以降解率为主要衡量标准,研究制冷剂降解的高效途径。从量子化学的角度,研究了HFC-134a自... 详细信息

我国面临巨大HFCs制冷剂销毁压力,亟需研究高效且温和的HFCs制冷剂降解方法。本文结合实验与量子化学计算,以典型HFCs制冷剂HFC-134a为研究对象,以降解率为主要衡量标准,研究制冷剂降解的高效途径。从量子化学的角度,研究了HFC-134a自热分解与氧化热解条件下的反应路径,在两条路径下,均易产生CHF=CF_(2)与HF等可检测到的稳定产物。自热分解过程中,第一步化学键的断裂是决速步骤。氧化热解路径相较自热分解路径,反应能垒低,有利于反应快速发生。从实验的角度,发现在240~360℃温度范围内,随着温度的提高,HFC-134a的降解率由11%提高至66%,通过反应动力学常数拟合计算,得到HFC-134a的指前因子为7471.04 h^(-1),表观反应活化能为54.16 kJ/mol,与模拟计算所得化学反应能垒相吻合。

关键词：反应能垒表观反应活化能氧化热解密度泛函方法 HFC-134a

Resting-state brain network remodeling after different nerve reconstruction surgeries:a functional magnetic resonance imaging study in brachial plexus injury rats

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Neural Regeneration Research 2025年第5期20卷 1495-1504页

作者： yunting Xiang Xiangxin Xing xuyun Hua Yuwen Zhang Xin xue Jiajia Wu Mouxiong Zheng He Wang Jianguang xu School of Rehabilitation Science Shanghai University of Traditional Chinese MedicineShanghaiChina Engineering Research Center of Traditional Chinese Medicine Intelligent Rehabilitation Ministry of EducationShanghaiChina Department of Rehabilitation Medicine Yueyang Hospital of Integrated Traditional Chinese and Western MedicineShanghai University of Traditional Chinese MedicineShanghaiChina Department of Traumatology and Orthopedics Yueyang Hospital of Integrated Traditional Chinese and Western MedicineShanghai University of Traditional Chinese MedicineShanghaiChina Institute of Science and Technology for Brain-Inspired Intelligence Fudan UniversityShanghaiChina Key Laboratory of Computational Neuroscience and Brain-Inspired Intelligence(Fudan University) Ministry of EducationShanghaiChina Human Phenome Institute Fudan UniversityShanghaiChina

Distinct brain remodeling has been found after different nerve reconstruction strategies,including motor representation of the affected ***,differences among reconstruction strategies at the brain network level have not been *** study aimed to explore intranetwork changes related to altered peripheral neural pathways after different nerve reconstruction surgeries,including nerve repair,endto-end nerve transfer,and end-to-side nerve ***–Dawley rats underwent complete left brachial plexus transection and were divided into four equal groups of eight:no nerve repair,grafted nerve repair,phrenic nerve end-to-end transfer,and end-to-side transfer with a graft sutured to the anterior upper ***-state brain functional magnetic resonance imaging was obtained 7 months after *** independent component analysis algorithm was utilized to identify group-level network components of interest and extract resting-state functional connectivity values of each voxel within the *** in intra-network resting-state functional connectivity were compared among the *** muscle reinnervation was assessed by behavioral observation(elbow flexion)and *** results showed that alterations in the sensorimotor and interoception networks were mostly related to changes in the peripheral neural *** repair was related to enhanced connectivity within the sensorimotor network,while end-to-side nerve transfer might be more beneficial for restoring control over the affected limb by the original motor *** thalamic-cortical pathway was enhanced within the interoception network after nerve repair and end-to-end nerve *** areas related to cognition and emotion were enhanced after end-to-side nerve *** study revealed important brain networks related to different nerve *** networks may be potential targets for enhancing motor recovery.

关键词： brain functional networks end-to-end nerve transfer end-to-side nerve transfer independent component analysis nerve repair peripheral plexus injury resting-state functional connectivity

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精炼炉(LF炉)负荷无功补偿及谐波治理

天津冶金 2011年第5期 31-32,48页

作者：徐云亭天津钢铁集团有限公司天津300301

精炼炉(以下称LF炉)在冶炼过程中产生电压波动、电压闪变、谐波及负序电流,同时功率因数较低,构成了电网公害。概述了该类负荷的危害及治理方法,并以天津钢铁集团有限公司二期工程的35kVLF炉为例,详细介绍了治理装置的原理及设计方法,... 详细信息

精炼炉(以下称LF炉)在冶炼过程中产生电压波动、电压闪变、谐波及负序电流,同时功率因数较低,构成了电网公害。概述了该类负荷的危害及治理方法,并以天津钢铁集团有限公司二期工程的35kVLF炉为例,详细介绍了治理装置的原理及设计方法,并通过系统仿真进一步确认了该设计的正确性和可行性。

关键词：无功功率补偿谐波滤波器电压波动闪变

移动式X射线摄影机对鼻空肠管放置后末端定位的曝光参数研究

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实用医技杂志 2022年第12期29卷 1295-1297页

作者：黄毅徐云亭南京医科大学第一附属医院放射科 210029

目的探讨移动式X线机在鼻空肠管放置后末端定位的曝光参数研究。方法选取80例床旁盲插鼻空肠管置入术患者,根据曝光参数的不同分为2组,每组40例。保持管电压70 kV不变,将电流从16 mAs等差递减至2 mAs,分组间隔0.8 mAs,每组拍摄2例。... 详细信息

目的探讨移动式X线机在鼻空肠管放置后末端定位的曝光参数研究。方法选取80例床旁盲插鼻空肠管置入术患者,根据曝光参数的不同分为2组,每组40例。保持管电压70 kV不变,将电流从16 mAs等差递减至2 mAs,分组间隔0.8 mAs,每组拍摄2例。根据临床医生的主观测评与辐射剂量测量,选择曝光参数最优的70 kV,3.2 mAs作为试验组;南京医科大学第一附属医院厂家设置的曝光参数为(70~75 k V,16 mAs),取图像质量最优的曝光参数75 kV,16 mAs作为对照组。由2位高年资诊断医生对上述2组图像按照3分法进行图像质量评分。辐射剂量测量:选择特制体模,在距移动式X线机2 m处对2组曝光参数进行辐射剂量测量,记录曝光过程中的最大剂量率,每组测20次。结果 2组图像质量评分差异无统计学意义(P>0.05,χ^(2)=0);70 kV,3.2 mAs的最大剂量率[(10.85±0.10)μSv/h]低于75 kV,16 mAs的最大剂量率[(1.24±0.13)μSv/h],2组差异有统计学意义(t=17.38,P<0.05)。结论本研究设置的70 kV,3.2 mAs的曝光参数在图像质量上与厂家设置的75 kV,16 mAs的曝光参数无差别,可有效降低辐射剂量。

关键词：体层摄影术 X线鼻空肠管曝光参数 X射线摄影机移动式