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Corrosion behavior of three Ag–50Cu alloys prepared by different processes in NaCl solutions

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Rare Metals 2017年第1期36卷 61-68页

作者： Zhong-Qiu Jia Qiu-Ying Liang Qiu-Yue Tian Zhong-Qiu cao Yan Wang College of Chemistry-and Chemical Engineering Shenyang Normal University Shenyang 110034 China

Corrosion behavior of two nanocrystalline bulk Ag–50Cu alloys and one coarse-grained counterpart prepared by liquid-phase reduction(LPR), mechanical alloying(MA) and powder metallurgy(PM) methods,respectively, were investigated in Na Cl solutions. They were finished by means of PARM273 A and M5210 electrochemical apparatus through potentiodynamic polarization method and electrochemical impedance spectroscopy(EIS) technique. The results show that corrosion rates of three Ag–50Cu alloys increase with the increment of Na Cl solution concentrations. Corrosion rates of LPRAg–50Cu alloy are a little higher than those of PMAg–50Cu alloy,but evidently lower than those of MAAg–50Cu alloy. The difference in corrosion rates is attributed to the large reduction in the grain size and homogeneous microstructure of nanocrystalline alloys. Passive current densities decrease and afterward increase for PMAg–50Cu alloy,decrease for MAAg–50Cu alloy, and increase for LPRAg–50Cu alloy with the increment of Na Cl solution concentrations. After the grain sizes are refined, passive current densities become lower.

关键词： Copper alloys Corrosion Corrosion rate Corrosive effects Electrochemical corrosion Electrochemical impedance spectroscopy Electrochemistry Grain size and shape Mechanical alloying Nanocrystals Powder metallurgy Reduction Silver Silver alloys

Controlled one-pot synthesis of RuCu nanocages and Cu@Ru nanocrystals for the regioselective hydrogenation of quinoline

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Nano Research 2016年第9期9卷 2632-2640页

作者： Yueguang Chen Zhanjun Yu Zheng Chen Rongan Shen Yu Wang Xing cao Qing Peng Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering Tsinghua UniversityBeijing 100084China

RuCu nanocages and core–shell Cu@Ru nanocrystals with ultrathin Ru shells were first synthesized by a one-pot modified galvanic replacement reaction. The construction of bimetallic nanocrystals with fully exposed precious atoms and a high surface area effectively realizes the concept of high atom-efficiency. Compared with the monometallic Ru/C catalyst, both the RuCu nanocages and Cu@Ru core–shell catalysts supported on commercial carbon show superior catalytic performance for the regioselective hydrogenation of quinoline toward 1,2,3,4-tetrahydroquinoline. RuCu nanocages exhibit the highest activity, achieving up to 99.6% conversion of quinoline and 100% selectivity toward 1,2,3,4-tetrahydroquinoline. [Figure not available: see fulltext.] © 2015, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： bimetallics one-pot synthesis nanocages core-shell nanocrystals hydrogenation of quinoline

An Approach for Preparation of Excellent Antiwear PTFE Nanocomposites by Filling As-prepared Carbon Nanotubes/Nanorods(CNT/CNR)Mixed Nano-Carbon Material

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China Petroleum Processing & Petrochemical Technology 2018年第2期20卷 34-40页

作者： Cheng Zhilin cao Baochong Liu Zan Qin Dunzhong Zhu Aiping School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002 Jiangsu Sinvochem Co. Ltd.Yangzhou 225002 Zhenjiang High Technology Research Institute of Yangzhou University Zhenjiang212000

The one-dimensional carbon nanotubes/nanorods(CNT/CNR)mixed nano-carbon material was successfully prepared by halloysite nanotubes(HNTs)as the template for the first time,in which CNT was formed through PVA modification in internal surface of HNTs and CNR was obtained by nanocasting PVA in hollow nanostructure of *** CNT of the mixture with flexible structure has ca.20 nm in pore diameter and ca.500 nm in length,whereas the CNR with hard and solid structure shows ca.30 nm in diameter and ca.2μm in *** application as fillers,the CNT/CNR mixed nano-material is used to reinforce the properties of polytetrafluoroethylene(PTFE).The mechanical and tribological properties of PTFE nanocomposites were intensively examined by a series of *** ring-on-ring counterface was used to evaluate the tribological behavior of the *** results showed that the volume wear rate of the CNT/CNR-reinforced PTFE nanocomposite after being filled with 0.3%of CNT/CNR was only 1/700 of that of the pure PTFE under a load of 200 N and a rotary speed of 200 r/min,while other mechanical and tribological performance was comparable to the performance of pure PTFE,which exhibited a desirable application prospect.

关键词： carbon materials nanocomposite polytetrafuoroethylene mechanicalproperties tribological properties

Beneficial clinical effects of grape seed proanthocyanidin extract on the progression of carotid atherosclerotic plaques

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Journal of Geriatric Cardiology 2015年第4期12卷 417-423页

作者： Ai-Hong cao Jian WANG Hai-Qing GAO Ping ZHANG Jie QIU Department of Geriatrics Shandong University Qilu Hospital 107 Wenhua Xi Road Jinan Shandong China Shandong Provincial Key laboratory of Cardiovascular Proteomics 107 Wenhua Xi Road Jinan Shandong China

Background Atherosclerotic plaques indicate the occurrence of ischemia events and it is a difficult task for clinical physicians. Grape seed proanthocyanidin extract （GSPE） has been reported to exert an antiatherogenic effect by inducing regression of atherosclerotic plaques in animal experimental studies. In this study, the antiatherogenic effect of GSPE has been investigated in clinical use. Methods Consecu- tive 287 patients diagnosed with asymptomatic carotid plaques or abnormal plaque free carotid intima-media thickness （CIMT） were ran- domly assigned to the GSPE group （n = 146） or control group （n = 141）. The patients in the GSPE group received GSPE 200 mg per day orally, while patients in the control group were only enrolled in a lifestyle intervention program. Carotid ultrasound examination was per- formed at baseline and 6, 12, 24 months during follow-up. Mean maximum CIMT （MMCIMT）, plaque score, echogenicity of plaques and ischemic vascular events were recorded. Results As anticipated, after treatment, GSPE resulted in significant reduction in MMCIMT pro- gression （4.2% decrease after six months, 4.9% decrease after 12 months and 5.8% decrease after 24 months） and plaque score （10.9% de- crease after six months, 24.1% decrease after 12 months and 33.1% decrease after 24 months） for the primary outcome, while MMCIMT and plaque score were stable and even increased with the time going on in control group. The number of plaques and unstable plaques also de- creased after treatment of GSPE. Furthermore, the carotid plaque can disappear after treatment with GSPE. The incidence rate for transitory ischemic attack （TIA）, arterial revascularization procedure, and hospital readmission for unstable angina in GSPE group were statistically significant lower （P = 0.02, 0.08, 0.002, respectively） compared with the control group. Conclusions GSPE inhibited the progression of MMCIMT and reduced carotid plaque size in GSPE treated patients, and with extended treatment, the

关键词： Atherosclerosis Carotid plaque Grape seed proanthocyanidin extract

Vehicle sideslip trajectory prediction based on time-series analysis and multi-physical model fusion

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Journal of Intelligent and Connected Vehicles 2023年第3期6卷 161-172页

作者： Lipeng cao Yugong Luo Yongsheng Wang Jian Chen Yansong He College of Mechanical and Vehicle Engineering Chongqing UniversityChongqing 400030China School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China

On highways,vehicles that swerve out of their lane due to sideslip can pose a serious threat to the safety of autonomous *** ensure their safety,predicting the sideslip trajectories of such vehicles is ***,the scarcity of data on vehicle sideslip scenarios makes it challenging to apply data-driven methods for ***,this study uses a physical model-based approach to predict vehicle sideslip ***,the traditional physical model-based method relies on constant input assumption,making its long-term prediction accuracy *** address this challenge,this study presents the time-series analysis and interacting multiple model-based(IMM)sideslip trajectory prediction(TSIMMSTP)method,which encompasses time-series analysis and multi-physical model fusion,for the prediction of vehicle sideslip ***,we use the proposed adaptive quadratic exponential smoothing method with damping(AQESD)in the time-series analysis module to predict the input state sequence required by kinematic ***,we employ an IMM approach to fuse the prediction results of various physical *** implementation of these two methods allows us to significantly enhance the long-term predictive accuracy and reduce the uncertainty of sideslip *** proposed method is evaluated through numerical simulations in vehicle sideslip scenarios,and the results clearly demonstrate that it improves the long-term prediction accuracy and reduces the uncertainty compared to other model-based methods.

关键词： autonomous vehicle sideslip trajectory prediction adaptive quadratic exponential smoothing with damping(AQESD) interacting multiple model(IMM)

Developing natural polymers for skin wound healing

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Bioactive Materials 2024年第3期33卷 355-376页

作者： Han Zhang Xiang Lin Xinyue cao Yu Wang Jinglin Wang Yuanjin Zhao Department of Rheumatology and Immunology Nanjing Drum Tower HospitalSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing210096China Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhou 325001China Shenzhen Research Institute Southeast UniversityShenzhen518038China

Natural polymers are complex organic molecules that occur in the natural environment and have not been subjected to artificial *** are frequently encountered in various creatures,including mammals,plants,and *** aforementioned polymers are commonly derived from renewable sources,possess a notable level of compatibility with living organisms,and have a limited adverse effect on the *** a result,they hold considerable significance in the development of sustainable and environmentally friendly *** recent times,there has been notable advancement in the investigation of the potential uses of natural polymers in the field of biomedicine,specifically in relation to natural biomaterials that exhibit antibacterial and antioxidant *** review provides a comprehensive overview of prevalent natural polymers utilized in the biomedical domain throughout the preceding two *** this paper,we present a comprehensive examination of the components and typical methods for the preparation of biomaterials based on natural ***,we summarize the application of natural polymer materials in each stage of skin wound ***,we present key findings and insights into the limitations of current natural polymers and elucidate the prospects for their future development in this field.

关键词： Natural polymers Biomaterials Biomedical engineering Wound healing Tissue engineering

Plasmonic quantum dots modulated nano-mineral toward photothermal reduction of CO_(2)coupled with biomass conversion

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Nano Research 2024年第6期17卷 5061-5072页

作者： Guangbiao cao Haoran Xing Haoguan Gui Chao Yao Yinjuan Chen Yongsheng Chen Xiazhang Li National-local Joint Engineering Research Center of Biomass Refining and High-quality Utilization Changzhou UniversityChangzhou 213164China School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlantaGA 30332-0373USA

Simultaneous conversion of CO_(2)and biomass into value-added chemicals through solar-driven catalysis holds tremendous importance for fostering a sustainable circular ***,plasmonic Bi quantum dots were immobilized on phosphoric acid modified attapulgite(P-ATP)nanorod using an in-situ reduction-deposition method,and were employed for photocatalytic reduction of CO_(2)coupled with oxidation of biomass-derived benzyl *** revealed that Bi atoms successfully integrated into the basal structure of P-ATP,forming chemically coordinated Bi-O-Si bonds that served as efficient transportation channels for *** incorporation of high-density monodispersed Bi quantum dots induced a surface plasmon resonance(SPR)effect,expanding the light absorption range into the near-infrared *** a consequence,the photo-thermal transformation was significantly accelerated,leading to enhanced reaction ***,50%Bi/P-ATP nanocomposite exhibited the highest plasmon-mediated photocatalytic CH4 generation(115.7μmol·g^(−1)·h^(−1))and CO generation(44.9μmol·g^(−1)·h^(−1)),along with remarkable benzaldehyde generation rate of 79.5μmol·g^(−1)·h^(−1)in the photo-redox coupling system under solar light *** hydrogen protons released from the oxidation of benzyl alcohol facilitated the incorporation of more hydrogen protons into CO_(2)to form key CH_(3)O−*** work demonstrates the synergistic solar-driven valorization of CO_(2)and biomass using natural mineral based catalyst.

关键词： photothermal catalysis clay mineral plasmon CO_(2)reduction biomass conversion

Multi-Time Scale Optimal Scheduling of a Photovoltaic Energy Storage Building System Based on Model Predictive Control

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Energy Engineering 2024年第4期121卷 1067-1089页

作者： Ximin cao Xinglong Chen He Huang Yanchi Zhang Qifan Huang School of Electrical Engineering Shanghai DianJi UniversityShanghai201306China

Building emission reduction is an important way to achieve China’s carbon peaking and carbon neutrality *** at the problem of low carbon economic operation of a photovoltaic energy storage building system,a multi-time scale optimal scheduling strategy based on model predictive control(MPC)is proposed under the consideration of load ***,load optimization is achieved by controlling the charging time of electric vehicles as well as adjusting the air conditioning operation temperature,and the photovoltaic energy storage building system model is constructed to propose a day-ahead scheduling strategy with the lowest daily operation ***,considering inter-day to intra-day source-load prediction error,an intraday rolling optimal scheduling strategy based on MPC is proposed that dynamically corrects the day-ahead dispatch results to stabilize system power fluctuations and promote photovoltaic ***,taking an office building on a summer work day as an example,the effectiveness of the proposed scheduling strategy is *** results of the example show that the strategy reduces the total operating cost of the photovoltaic energy storage building system by 17.11%,improves the carbon emission reduction by 7.99%,and the photovoltaic consumption rate reaches 98.57%,improving the system’s low-carbon and economic performance.

关键词： Load optimization model predictive control multi-time scale optimal scheduling photovoltaic consumption photovoltaic energy storage building

Assessing Agricultural Sustainable Development Based on the DPSIR Approach: Case Study in Jiangsu, China

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Journal of Integrative Agriculture 2013年第7期12卷 1292-1299页

作者： ZHOU Shu-dong Felix Mueller Benjamin Burkhard cao Xing-jin HOU Ying Jiangsu Research Base of Rural Development and Land Policy Nanjing Agricultural University Institute for Natural Resource Conservation Department of Ecosystem Management University of Kiel

According to the contemporary ecosystem approach, the linkages of human actions with their environment have to be assessed in an integrative manner. The Driver-Pressure-State-Impact-Response （DPSIR） model is applied to identify and describe processes and interactions in human-environmental systems. An example application from a research project dealing with the development of sustainable management strategies for the agriculture in Jiangsu, China, illustrates the potentials and limitations of its sustainable development. The concept and indicators of ecological integrity are used to assess the indicators in the dimensions of DPSIR between 2003 and 2006. The main drivers included population growth which caused increasing demand for food, growing environmental demands, and rapidly decreasing of land and other natural resources. The main environmental problem was water pollution. The results show that in the dimension of driver, total grain output and agricultural land productivity both increased. Labor intensive agriculture has been promoted to increase agricultural land productivity. In the dimension of pressure, on the positive side, infrastructure got greatly improved, the input level such as total power of machinery, and level of fertilizer use increased, and level of pesticides use decreased, but on the negative side, cultivated land per capita and irrigation rate decreased, natural resources keep decreased. Environmental pollution indicators such as industrial wastewater discharge and acid rain rate increased in Jiangsu Province. In the aspect of state, ecosystem state was improved, plant coverage index increased, biological abundance index increased, fertilizer productivity increased, eco-environmental quality index increased, but land degradation index also increased. In the aspect of impact, output level increased, output efficiency enhanced, farmer＇s social economic benefit improved. In the aspect of response, social support was greatly improved, input for e

关键词： agricultural sustainable development DPSIR ecosystem China