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Synthesis of Polyethylenes with In-Chain Isolated Carbonyls from CO_(2)and Ethylene via a Tandem Photoreduction/Polymerization Protocol

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CCS Chemistry 2024年第6期6卷 1591-1599页

作者： Fulin zhou Haojie Dai shan Tang Yongfeng zhou Frontiers Science Center for Transformative Molecules Shanghai Key Laboratory for Molecular Engineering of Chiral DrugsSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240

Aiming at accessing polyethylene-bearing in-chain degradable functionality,copolymerization of carbon dioxide(CO_(2))with ethylene has long been recognized as a significant but highly challenging ***,most trials have resulted in ethylene homopolymerization because of the endothermic property and high energy barriers of CO_(2)insertion during polymer chain *** we report an unprecedented tandem reaction protocol for the synthesis of polyethylenes with in-chain carbonyls from CO_(2)and ethylene by the combination of photocatalytic CO_(2)reduction and palladium-catalyzed coordination/insertion *** protocol provides an easy way to adjust the carbonyl content(from 0.13 to 12 mol%)and insertion selectivity(up to 99%isolated carbonyls)of the polyethylene copolymers,which enables the polymers tomaintain the main properties of highdensity polyethylene and simultaneously endows them with good *** addition,besides apolar polyethylene copolymers,polar-functionalized polyethylenes with in-chain isolated carbonyls can also be synthesized from CO_(2),ethylene and a polar monomer using the same *** believe our present work sheds new light on the synthesis of degradable polyethylenes by employing CO_(2)as a green carbonyl source.

关键词： carbon dioxide coordination polymerization polyethylene photoreduction photodegradation

Dynamic changes and clinical value of lipocalin 2 in liver diseases caused by microbial infections

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World Journal of Hepatology 2024年第2期16卷 177-185页

作者： Feng Chen shan-shan Wu Chao Chen Cheng zhou State Key Laboratory for Diagnosis and Treatment of Infectious Diseases National Clinical Research Center for Infectious DiseasesNational Medical Center for Infectious DiseasesCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesThe First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003Zhejiang ProvinceChina

Lipocalin 2(LCN2)plays a pivotal role in iron metabolism,particularly in the context of microbial infection resistance(e.g.,viruses,bacteria,parasites,etc.).LCN2 combats microbial infection by directly assisting the body in competing with microorganisms for iron,inducing immune cells to secrete various cytokines to enhance systemic immune responses,or recruiting neutrophils to infectious *** liver serves as the primary organ for LCN2 secretion during microbial *** review encapsulates recent advances in dynamic changes,clinical values,and the effects of LCN2 in infectious liver diseases caused by various microbial microorganisms.

关键词： Lipocalin 2 Microbial infection Immunity Liver diseases

Persistent greening against drying in northeast Asian semiarid grasslands:Asymmetrical responses of direct and legacy effects to intensified drought

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Advances in Climate Change Research 2024年第1期15卷 9-20页

作者： Yu-Tong MA Hai-shan CHEN Yao-Ming SONG Bo-Tao zhou shan-Lei SUN Xin-Guan DU Yue SUN Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China School of Atmospheric Sciences Nanjing University of Information Science and TechnologyNanjing 210044China

Despite experiencing a decadal shift towards drought conditions at the end of the 2Oth century,semiarid grasslands in northeast Asia(NEA)exhibited an evident greening trend from 1982 to ***,the mechanism behind this phenomenon remains ***,we analysed the interdecadal changes in vegetation response to drought on the basis of the standardised precipitation evapotranspiration index(SPEI)and Global Inventory Modelling and Mapping Studies LAI4g datasets,with an emphasis on the differences between direct and legacy effects(as measured by resilience),to explore the mechanism of persistent grassland *** revealed that during the post-drought shift period(2000-2020),the sudden decrease in the water content of the intermediate soil layer triggered an intensified vegetation response to ***,although direct effects and resilience were amplified,they exhibited asymmetric *** was stronger than direct effects,and this difference increased with increasing drought(drought recovery)*** combined effects may account for persistent greening against intensified drying in the semiarid grasslands in *** the projected exacerbation of future droughts,this study holds notable importance for comprehending the long-term change dynamics of dryland ecosystems.

关键词： Semiarid grassland Drought decadal shift Direct effect Legacy effect(resilience) Northeast Asia

Combination therapy reduces the percutaneous coronary intervention acute myocardial infarction incidence of no-reflow after primary in patients with ST-segment elevation

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Journal of Geriatric Cardiology 2015年第2期12卷 135-142页

作者： shan-shan zhou Feng TIAN Yun-Dai CHEN Jing WANG Zhi-Jun SUN Jun GUO Qin-Hua JIN Department of Cardiology Chinese PLA General Hospital Fuxing Road 28 Haidian District Beij'ing 100853 China

Background No-reflow is associated with an adverse outcome and higher mortality in patients with ST-segment elevation acute myocardial infarction （STEMI） who undergo percutaneous coronary intervention （PCI） and is considered a dynamic process characterized by multiple pathogenetic components. The aim of this study was to investigate the effectiveness of a combination therapy for the prevention of no-reflow in patient with acute myocardial infarction （AMI） undergoing primary PCI. Methods A total of 621 patients with STEMI who underwent emergency primary PCI were enrolled in this study. Patients with high risk of no-reflow （no-flow score 〉 10, by using a no-flow risk prediction model, n = 216） were randomly divided into a controlled group （n = 108） and a combination therapy group （n = 108）. Patients in the controlled group received conventional treatment, while patients in combination therapy group received high-dose （80 mg） atorvastatin pre-treatment, intracoronary administration of adenosine （140 ~tg/min per kilogram） during PCI procedure, platelet membrane glycoprotein lib/Ilia receptor antagonist （tirofiban, ***/kg bolus followed by 0.15 ~tg/kg per minute） and thrombus aspiration. Myocardial contrast echocardiography was performed to assess the myocardial perfusion 72 h after PCI. Major adverse cardiac events （MACE） were followed up for six months. Results Incidence of no-reflow in combination therapy group was 2.8%, which was similar to that in low risk group 2.7% and was significantly lower than that in control group （35.2%, P 〈 0.01）. The myocardial perfusion （A= 13） values were higher in combination therapy group than that in control group 72 h after PCI. After 6 months, there were six （6.3%） MACE events （one death, two non-fatal MIs and three revasculafizations） in combination therapy group and 12 （13.2%）（four deaths, three non-fatal MIs and five revascularizations, P 〈 0.05） in control group. Conclusions Combination of thrombus aspiration, high-dose stat

关键词： Acute myocardial infarction Myocardial contrast echocardiography No-reflow phenomenon Percutaneous coronary interven-tion ST-elevation myocardial infarction

Experimental study on temperature fluctuations on plate surface induced by coaxial-jet flow

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Nuclear Science and Techniques 2024年第5期35卷 139-153页

作者： Xue-Yao Xiong Zun-Quan Liu Guo-Yan zhou Xing Luo shan-Tung Tu Key Laboratory of Pressure Systems and Safety(MOE) East China University of Science and TechnologyShanghai 200237China Institute of Thermodynamics Gottfried Wilhelm Leibniz University Hannover30823 GarbsenGermany

In nuclear reactors,temperature fluctuations of fluids may cause fatigue damage to adjacent structures;this is referred to as thermal *** on thermal striping in the upper plenum has mainly focused on fluid *** experimental studies have been reported on solid structures in a fluid field with a coaxial *** study entailed an experimental study of the temperature fluctuations in the fluid and on a plate surface caused by a coaxial *** temperature fluctuations of the fluid and plate surfaces located at different heights were *** cause of the temperature fluctuation was analyzed using a transient temperature *** results show that the mixing of the hot and cold fluids gradually becomes uniform in the positive axial *** average surface temperatures tended to be *** the jet reaches the plate surface,the swing of the jet center,contraction and expansion of the cold jet,and changes in the jet shape result in temperature *** intensity of the temperature fluctuation was affected by the *** attention should be paid when the plate is located at a lower height,and between the hot and cold-fluid nozzles.

关键词： Temperature fluctuation Thermal striping Coaxial jet Thermal mixing The upper plenum of nuclear reactor

A data-driven model of drop size prediction based on artificial neural networks using small-scale data sets

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Chinese Journal of Chemical Engineering 2024年第2期66卷 71-83页

作者： Bo Wang Han zhou shan Jing Qiang Zheng Wenjie Lan Shaowei Li Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102249China State Key Laboratory of Chemical Engineering Tsinghua UniversityBeijing 100084China

An artificial neural network(ANN)method is introduced to predict drop size in two kinds of pulsed columns with small-scale data *** training,the deviation between calculate and experimental results are 3.8%and 9.3%,*** ANN model,the influence of interfacial tension and pulsation intensity on the droplet diameter has been *** size gradually increases with the increase of interfacial tension,and decreases with the increase of pulse *** can be seen that the accuracy of ANN model in predicting droplet size outside the training set range is reach the same level as the accuracy of correlation obtained based on experiments within this *** two kinds of columns,the drop size prediction deviations of ANN model are 9.6%and 18.5%and the deviations in correlations are 11%and 15%.

关键词： Artificial neural network Drop size Solvent extraction Pulsed column Two-phase flow Hydrodynamics

Identification of Important FPGA Modules Based on Complex Network

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Computers, Materials & Continua 2024年第1期78卷 1027-1047页

作者： Senjie Zhang Jinbo Wang shan zhou Jingpei Wang Zhenyong Zhang Ruixue Wang School of Aeronautics and Astronautics University of Chinese Academy of SciencesBeijing101408China Technology and Engineering Center for Space Utilization Chinese Academy of SciencesBeijing100094China College of Control Science and Engineering Zhejiang UniversityHangzhou310063China College of Computer Science and Technology Guizhou UniversityGuiyang550025China

The globalization of hardware designs and supply chains,as well as the integration of third-party intellectual property(IP)cores,has led to an increased focus from malicious attackers on computing ***,existing defense or detection approaches often require additional circuitry to perform security verification,and are thus constrained by time and resource *** the scale of actual engineering tasks and tight project schedules,it is usually difficult to implement designs for all modules in field programmable gate array(FPGA)*** studies have pointed out that the failure of key modules tends to cause greater damage to the ***,under limited conditions,priority protection designs need to be made on key modules to improve protection *** have conducted research on FPGA designs including single FPGA systems and multi-FPGA systems,to identify key modules in FPGA *** the single FPGA designs,considering the topological structure,network characteristics,and directionality of FPGA designs,we propose a node importance evaluationmethod based on the technique for order preference by similarity to an ideal solution(TOPSIS)***,for the multi-FPGA designs,considering the influence of nodes in intra-layer and inter-layers,they are constructed into the interdependent network,and we propose a method based on connection strength to identify the important ***,we conduct empirical research using actual FPGA designs as *** results indicate that compared to other traditional indexes,node importance indexes proposed for different designs can better characterize the importance of nodes.

关键词： Hardware security FPGA circuits node importance interdependent network

Validating the accuracy of a multifunctional smartwatch sphygmomanometer to monitor blood pressure

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Journal of Geriatric Cardiology 2022年第11期19卷 843-852页

作者： Li YI Zhong-Hua LV Shun-Ying HU Yu-Qi LIU Jia-Bing YAN Hui Zhang Hong-Bao LI Qin CHEN Yue-Yang LI Yu-Fan JIANG Hao zhou Mu-Ding LI Run-Du CHEN Xiao-Long LI shan-shan zhou Yun-Dai CHEN Department of Cardiology the First Medical CentreChinese PLA General HospitalBeijingChina Department of Cardiology the Sixth Medical CentreChinese PLA General HospitalBeijingChina Medical School of Chinese PLA BeijingChina Huawei Device Co. Ltd.ShenzhenChina

BACKGROUND Hypertension is the most modifiable factor associated with cardiovascular events and *** conventional blood pressure(BP) meter method is simple but is limited in terms of real-time monitoring abnormal ***,the development of a multifunction smartwatch(HUAWEI WATCH D) sphygmomanometer could significantly improve integrated BP *** We enrolled 361 subjects from Chinese PL A General Hospital,Beijing,China to validate the accuracy of the smartwatch versatile sphygmomanometer using ISO 81060-2:*** and ambulatory BP accuracy of the smartwatch were compared with gold standard clinical sphygmomanometers using ISO 81060-2:2018 guidelines,the accuracy of 24 h systolic blood pressure(SBP) circadian rhythm monitoring,and diurnal high SBP alert for this smartwatch were assessed using a confusion matrix ***,we analyzed online users of different ages for *** Eighty-five subjects underwent resting BP measurements;the mean resting BP differences between two devices were-0.683±6.203 mmHg(SBP)(P=0.723) and 1.628±5.028 mmHg(diastolic blood pressure,DBP)(P=0.183).In 35 subjects’ ambulatory BP measurements,the mean differences of ambulatory BP were-1.943±5.475 mmHg(SBP)(P=0.923) and 3.195±5.862 mmHg(DBP)(P=0.065).All data complied with ISO 81060-2:2018 guidelines(mean ≤±5 mmHg and standard deviation ≤±8 mmHg) with no significant *** predictive values(PPV) of resting SBP and DBP were 0.635 and 0.671,*** PPV of ambulatory SBP and DBP were ***,24 h SBP circadian rhythm monitoring was performed in 107 subjects:accuracy=0.850,specificity=0.864,precision/PPV=0.833,sensitivity=0.833,and F1-measure(F1)=*** accuracy,specificity,precision,sensitivity,and F1 values in 85 subjects undergoing diurnal high SBP alerting were 0.858,0.876,0.706,0.809,and 0.754,*** When compared with the gold standard clinical sphygmomanometer,smartwatch results were cons

关键词： specificity smart dating

Quantitative flow ratio and intravascular ultrasound guided percutaneous coronary intervention of left anterior descending lesion concomitant with severe coronary myocardial bridge

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Journal of Geriatric Cardiology 2019年第12期16卷 905-908页

作者： Xiao-Qing CAI Jing JING Jin WEN Wei-Jun YIN Yang LIU Wei HU Fei WANG Ling MA shan-shan zhou Tao ZHANG Feng TIAN Lian CHEN Yun-Dai CHEN Department of Cardiology the 940th Hospital of Joint Logistics Support Force of Chinese PLALanzhouChina Department of Cardiology the First Medical Center of Chinese PLA General HospitalBeijingChina Department of Medical Service the 940th Hospital of Joint Logistics Support Force of Chinese PLALanzhouChina Department of Cardiology the 305 Hospital of Chinese PLABeijingChina

Severe coronary stenosis concomitant with congenital coronary myocardial bridge(MB)is a tough scenario for cardiologist to perform revascularization,for which the complication rates including in-stent restenosis,stent fracture,stent thrombosis and even coronary perforation are still high.[1,2]Meanwhile,the necessity of revascularization in such patients is worth prudent *** imaging modalities are crucial and helpful in making revascularized decisions and ***,we report a case using quantitative flow ratio(QFR)and intravascular ultrasound(IVUS)to facilitate accurate revascularization in a patient with both severe coronary stenosis and deep coronary MB.

关键词： Coronary myocardial bridge Intravascular ultrasound Percutaneous coronary intervention Quantitative flow ratio