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Large-scale multirole Zn(Ⅱ) programmed synthesis of ultrathin hierarchically porous carbon nanosheets

Science China(Technological Sciences) 2020年第9期63卷 1730-1738页

作者： XU LingSong MENG FanCheng WEI XiangFeng LIN ChangHao zheng lianxi LIU JicHua Future Energy Laboratory School of Materials Science and EngineeringHefei University of TechnologyHefei230009China Department of Mechanical Engineering School of EngineeringKhalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates Engineering Research Center of High-Performance Copper Alloy Materials and Processing Ministry of EducationKey Laboratory of Advanced Functional Materials and Devices of Anhui ProvinceHefei230009China

ZIF-derived carbon structures are considered as desired electrode materials for supercapacitors due to their high surface area,high conductivity, and porous structure. However, the most reported ratio of 2-methylimidazole and Zn(II) is 4:1 to 20:1, which limits commercial applications due to the increasing cost. In this paper, a multirole Zn(II)-assisted method is presented from Zn(II) solution, Zn O, Zn O/ZIF-8 core-shell nanostructure, to 3 D hierarchical micro-meso-macroporous carbon structures with a1:1 ratio of 2-methylimidazole and Zn(II). The hierarchically porous carbon has a high surface area of 1800 m2 g^(-1) due to the synergistic effect of multirole Zn(II). The unique carbon-based half-cell delivers the specific capacitances of 377 and 221 F g^(-1) at the current densities of 1.0 and 50 A g^(-1), respectively. As a 2.5 V symmetrical supercapacitor, the device reveals a high doublelayer capacitance of 24.4 F g^(-1), a power density of 62.5 k W kg^(-1), and more than 85.8% capacitance can be retained over 10000 cycles at 10 A g^(-1). More importantly, the low-cost hierarchically porous carbon could be easily produced on a large scale and almost all chemicals can be reused in the sustainable method.

关键词： multirole Zn(Ⅱ) hierarchically porous carbon N doping carbon nanosheets supercapacitor

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Competitive intermetallics formation in Pd-Zn-Cd system via seeded growth from ultra-thin Pd nanosheets for electrocatalytic ethanol oxidation reaction

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Nano Research 2024年第9期17卷 8552-8559页

作者： Donghao Zhang lianxi Si Qianqian Ren Xintong Yan Shi Hu Department of Chemistry School of ScienceTianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300072China

Pd-based catalysts exhibit higher catalytic activity and durability in many electrochemical ***,the electrochemical performance can be further enhanced by fine-tune of the alloy *** binary alloys have been fully studied,the multicomponent alloys are far beyond understanding,which leaves cocktail effect a compromised explanation for the high-entropy *** Pd nanosheet-seeded growth was used to synthesize a Pd-Zn-Cd ternary alloy by accurately controlling the Pd-Zn-Cd molar ratio through adjusting the amount of introduced Cd *** analysis of the crystal phase structure of PdCdZnx and PdZn_(x)Cd_(1-x),the competitive relationship of Zn and Cd in the alloying process with Pd was unveiled:Pd1Cd1 intermetallics(IMC)is thermodynamically favored over Pd_(1)Zn_(1)IMC in the ternary ***,the increased structure stability of PdCd over PdZn does not bring about increased durability in the catalytic ethanol oxidation *** morphology selection of Pd seeds is also crucial for the study,as Pd cubes,Pd tetrahedrons,and Pd octahedrons do not form PdZn in the same *** successful alloying through the seeded growth depends on the maximum diffusion depth of foreign atoms into the seed.

关键词： PdZn alloy seed growth method ethanol oxidation reaction composition control ternary alloying

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吉西他滨联合替吉奥治疗晚期胰腺癌的疗效和安全性

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中华肿瘤杂志 2015年第6期37卷 472-475页

作者：江英强钟惠何平郑连喜杨科攀钢集团总医院肿瘤科攀枝花617023

目的：探讨吉西他滨联合替吉奥治疗晚期胰腺癌的疗效和安全性。方法回顾性分析49例未接受放化疗的晚期胰腺癌患者的临床资料，其中研究组25例，对照组24例。研究组患者给予吉西他滨1000 mg／m2，第1、8天静脉滴注；同时给予替吉奥80 mg... 详细信息

目的：探讨吉西他滨联合替吉奥治疗晚期胰腺癌的疗效和安全性。方法回顾性分析49例未接受放化疗的晚期胰腺癌患者的临床资料，其中研究组25例，对照组24例。研究组患者给予吉西他滨1000 mg／m2，第1、8天静脉滴注；同时给予替吉奥80 mg／m2，第1～14天分早晚2次口服，21 d为1个化疗周期。对照组给予GEMOX方案，即吉西他滨1000 mg／m2，第1、8天静脉滴注；奥沙利铂130 mg／m2，第1天静脉滴注，21 d为1个化疗周期。观察研究组和对照组患者的疗效和毒副反应。结果研究组患者的有效率为32．0％，疾病控制率为72．0％；对照组患者的有效率为25．0％，疾病控制率为58．3％，差异均无统计学意义（均P＞0．05）。研究组和对照组患者的临床受益率分别为80．0％和50．0％，差异有统计学意义（P＜0．05）。研究组和对照组患者的中位生存时间分别为9．7和9．0个月，差异有统计学意义（ P＜0．05）。两组患者的药物毒副反应均能耐受，无化疗相关性死亡患者。毒副反应主要表现为骨髓抑制和消化道反应，且研究组患者的治疗毒副反应发生率低于对照组。结论吉西他滨联合替吉奥治疗晚期胰腺癌安全、有效，且毒副反应较轻，患者可以耐受。

关键词：胰腺肿瘤药物疗法吉西他滨奥沙利铂替吉奥安全

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上调叉头框转录因子J2对肺癌细胞凋亡及CHOP蛋白表达的影响

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郑州大学学报（医学版） 2019年第6期54卷 854-858页

作者：郑连喜邓超何平屈敏攀钢总医院肿瘤科四川攀枝花617000 重庆三峡中心医院肿瘤科重庆404000

目的:探讨上调叉头框转录因子J2(Foxj2.对肺癌细胞凋亡和CCAAT/增强子结合蛋白同源蛋白(CHOP)表达的影响。方法:用qRT-PCR和Western blot法检测肺癌A549、H1299、SPCA1细胞和正常肺HBE细胞中Foxj2 mRNA和蛋白的表达情况。SPCA1细胞分别... 详细信息

目的:探讨上调叉头框转录因子J2(Foxj2.对肺癌细胞凋亡和CCAAT/增强子结合蛋白同源蛋白(CHOP)表达的影响。方法:用qRT-PCR和Western blot法检测肺癌A549、H1299、SPCA1细胞和正常肺HBE细胞中Foxj2 mRNA和蛋白的表达情况。SPCA1细胞分别感染pLV-EGFP-Foxj2慢病毒(Foxj2组)和pLV-EGFP对照慢病毒(阴性对照组),以未感染细胞为空白对照。48 h后,采用qRT-PCR和Western blot法检测Foxj2 mRNA和蛋白的表达,采用MTT法检测细胞增殖,Annexin V-FITC/PI双染法检测细胞凋亡,Western blot法检测细胞中活化转录因子4(ATF4)、活化的Caspase-3(Cleaved Caspase-3)、CHOP、Bax蛋白表达水平。结果:肺癌A549、H1299、SPCA1细胞中Foxj2 mRNA和蛋白表达水平均低于正常肺HBE细胞(P均<0.05)。与阴性对照组和空白对照组相比,Foxj2组SPCA1细胞中Foxj2 mRNA和蛋白的表达水平升高,细胞存活率降低,凋亡率升高,细胞中ATF4、Cleaved Caspase-3、CHOP、Bax蛋白表达水平升高(P均<0.05)。结论:Foxj2在肺癌细胞中表达水平降低;上调Foxj2的表达可能通过内质网途径诱导肺癌细胞凋亡。

关键词：叉头框转录因子J2 肺癌凋亡 CCAAT/增强子结合蛋白同源蛋白

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Plate tectonics in the Archean:Observations versus interpretations

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Science China Earth Sciences 2024年第1期67卷 1-30页

作者： YongFei zheng School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Key Laboratory of Crust-Mantle Materials and Environment Chinese Academy of SciencesHefei 230026China Center of Excellence for Comparative Planetology Chinese Academy of SciencesHefei 230026China

Plate tectonics theory,established in the 1960s,has been successful in explaining many geological phenomena,processes and events that occurred in the ***,the theory has often struggled to provide a coherent framework in interpreting geological records in continental interior and Precambrian *** dealing with the relationship between plate tectonics and continental geology,continental interior tectonics was often separated from continental margin tectonics in the inheritance and development of their structure and *** separation led to the illusion that the plate tectonics theory is not applicable to Precambrian geology,particularly in explaining the fundamental geological characteristics of Archean *** this illusion does not mean that the Archean continental crust did not originate from a regime of plate tectonics,it led to the development of alternative tectonic models,often involving vertical movements under a regime of stagnant lid tectonics,including not only endogenous processes such as gravitational sagduction,mantle plumes and heat pipes but also exogenous processes such as bolide *** vertical processes were not unique to the Archean but persisted into the *** result from mantle poloidal convection at different depths,not specific to any particular *** the plate tectonics theory from the traditional kinematic model in the 20th century to a holistic kinematic-dynamic model in the 21st century and systematically examining the vertical transport of matter and energy at plate margins,it is evident that plate tectonics can explain the common geological characteristics of Archean cratons,such as lithological associations,structural patterns and metamorphic *** deciphering the structure and composition of convergent plate margins as well as their dynamics,the formation and evolution of continental crust since the Archean can be divided into ancient plate tectonics in the Preca

关键词： Plate tectonics Archean geology Continental origin Crustal reworking Plate interior Plate margin

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Discovery of the Significant Impacts of Swell Propagation on Global Wave Climate Change

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Journal of Ocean University of China 2024年第3期23卷 594-604页

作者： zheng Chongwei Dalian Naval Academy Dalian 116018China Marine Resources and Environment Research Group on the Maritime Silk Road Dalian 116018China

This study compared the differences in the wave climate in the South China Sea and North Indian Ocean under these two datasets:ERA-40 wave reanalysis and Mei’s hindcast wave *** the numerical calculation of regional ocean waves,the wave climate characteristics exhibited significant bias if the influence of external swells(swells from afar)was not fully considered,which may provide an incorrect basis for global climate change analysis.1)The trends of the significant wave height(SWH)obtained from the two datasets showed significant differences,such as those of the Bay of Bengal and the Java Sea in *** the past 45 years,SWH from ERA-40(SWH-ERA)exhibited a significant annual increase in low-latitude waters of the North Indian Ocean(0.2-0.6 cm yr^(-1))and South China Sea(0.2-0.8 cm yr^(-1)).2)In the Bay of Bengal,the SWH-ERA in each month was generally 0.5 m higher than the SWH from Mei’s hindcast wave data(SWH-Mei)and can reach 1.0 m higher in some months.3)In the Bay of Bengal,SWH-ERA and SWH-Mei increased significantly at annual rates of 0.13 and 0.27 cm yr^(-1),*** increasing trend was mainly reflected after ***-ERA showed a trough in 1975(1.33 m)and a crest in 1992(1.83 m),which were not reflected in SWH-Mei.

关键词： wave climate climatic trend monthly variation annual variation external swell

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A positive trend in the stability of global offshore wind energy

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Acta Oceanologica Sinica 2024年第1期43卷 123-134页

作者： Chongwei zheng Dalian Naval Academy Dalian 116018China Marine Resources and Environment Research Group on the Maritime Silk Road Dalian 116018China Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China

The recognition on the trend of wind energy stability is still extremely rare,although it is closely related to acquisition efficiency,grid connection,equipment lifetime,and costs of wind energy *** the 40-year(1979–2018)ERA-Interim data from the European Center for Medium-Range Weather Forecasts,this study presented the spatial-temporal distribution and climatic trend of the stability of global offshore wind energy as well as the abrupt phenomenon of wind energy stability in key regions over the past 40 years with the climatic analysis method and Mann-Kendall(M-K)*** results show the following 5 points.(1)According to the coefficient of variation(C_(v))of the wind power density,there are six permanent stable zones of global offshore wind energy:the southeast and northeast trade wind zones in the Indian,Pacific and Atlantic oceans,the Southern Hemisphere westerly,and a semi-permanent stable zone(North Indian Ocean).(2)There are six lowvalue zones for both seasonal variability index(S_(v))and monthly variability index(M_(v))globally,with a similar spatial distribution as that of the six permanent stable zones.M_(v) and S_(v) in the Arabian Sea are the highest in the world.(3)After C_(v),M_(v) and S_(v) are comprehensively considered,the six permanent stable zones have an obvious advantage in the stability of wind energy over other sea areas,with C_(v) below 0.8,M_(v) within 1.0,and S_(v) within 0.7 all the year round.(4)The global stability of offshore wind energy shows a positive climatic trend for the past four decades.C_(v),M_(v) and S_(v) have not changed significantly or decreased in most of the global ocean during 1979 *** is,wind energy is flat or more stable,while the monthly and seasonal variabilities tend to shrink/smooth,which is beneficial for wind energy utilization.(5)C_(v) in the low-latitude Pacific and M_(v) and S_(v) in both the North Indian Ocean and the low-latitude Pacific have an obvious abrupt phenomenon at the end of

关键词： global oceans wind energy stability spatial-temporal distribution climatic trend

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Wind power and sand/dust storms

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Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 175-176页

作者： XiaoJing zheng Center for Particle-Laden Turbulence Lanzhou UniversityLanzhou 730000China

Sand/dust storms,a globally prevalent catastrophic weather phenomenon,can cause significant erosion to the climate and ecological *** high concentration of sand particles they carry not only impacts atmospheric qualit... 详细信息

关键词： Wind power and sand/dust storms

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Fatigue-resistant sliding ferroelectricity

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Science China Materials 2024年第10期67卷 3417-3418页

作者： zheng Liu School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

The direction of spontaneous polarization in ferroelectricity can be reoriented by an external electric *** special feature of ferroelectricity is important candidates for fabricating advanced nonvolatile random-access memory[1].However,repeatedly switching polarization induces the ferroelectric device performance degenerates due to a reduction of polarization.

关键词： polarization ferroelectric field.

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Damping Characteristic Analysis and Optimization of Wind-thermal-bundled Power Transmission by LCC-HVDC Systems

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 299-312页

作者： Liwen zheng Shiying Ma the Power System Department China Electric Power Research InstituteBeijing 100192China

With the rapid development of renewable energy,wind-thermal-bundled power transmission by line-commutated converter based high-voltage direct current(LCC-HVDC)systems has been widely *** dynamic interaction mechanisms among permanent magnet synchronous generators(PMSGs),synchronous generators(SGs),and LCC-HVDC system become *** deal with this issue,a path analysis method(PAM)is proposed to study the dynamic interaction mechanism,and the damping reconstruction is used to analyze the damping characteristic of the ***,based on the modular modeling,linearized models for the PMSG subsystem,the LCC-HVDC subsystem,and the SG subsystem are ***,based on the closed-loop transfer function diagram of the system,the disturbance transfer path and coupling relationship among subsystems are analyzed by the PAM,and the damping characteristic analysis of the SG-dominated oscillation mode is studied based on the damping *** with the PAM,the small-signal model of the system is obtained and eigenvalue analysis results are ***,the effect of the control parameters on the damping characteristic is analyzed and the conclusions are verified by time-domain ***,the penalty functions of the oscillation modes and decay modes are taken as the objective function,and an optimization strategy based on the Monte Carlo method is proposed to solve the parameter optimization *** simulation results are presented to validate the effectiveness of the proposed strategy.

关键词： Wind-thermal-bundled power transmission line-commutated converter based high-voltage direct current(LCC-HVDC) path analysis method(PAM) damping characteristic analysis Monte Carlo method

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