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43篇 您的检索式:作者名="Qichun Zhang"
    题名 作者 年代 出处 被引量
1Impacts of climate variability and extremes on global net primary production in the first decade of the 21st century显示文摘许多研究估计了全球陆上的网的大小主要生产(NPP ) ,而是它的变化,空间地并且时间地,仍然保持不明确。由使用一个改进基于过程的陆上的生态系统模型( DLEM ,动态陆地生态系统模型),我们提供多重环境因素导致的全球陆上的 NPP 的估计并且在整个 第21 世纪的第一十年在生物群系和全球层次并且沿着纬度检验陆上的 NPP 的反应到气候可变性。模型模拟在 20002009 期间估计 54.6 Pg C 年 1 的平均全球陆上的 NPP,从 2002 ~ 56.4 Pg C 的干燥的年里的 52.8 Pg C 年 1 变化 2008 的湿年里的年 1 。在湿年里,与十的平均数相比的陆上的 NPP 的大增加在 Amazonia,非洲和澳大利亚是流行的。在干燥的年里,然而,我们与十的平均数相比在全球陆上的 NPP 发现了 3.2% 减小,首先由于在热带区域的有限潮湿供应。在全球水平,降水在陆上的 NPP 解释了约 63% 变化,当剩余的在温度和另外的环境因素被归因于变化时。降水是在低纬度的区域在陆上的 NPP 决定内部年度的变化的主要因素。在中间纬度、高纬度的区域,然而,温度可变性大部分控制了陆上的 NPP 的大小。我们的结果暗示温暖并且增加气候极端事件的那投射气候将改变大小和全球陆上的 NPP 的空间与时间的模式。PAN Shufen TIAN Hanqin DANGAL Shree R.S. OUYANG Zhiyun LU Chaoqun YANG Jia TAO Bo REN Wei BANGER Kamaljit YANG Qichun ZHANG Bowen 2015Journal of Geographical Sciences2015,25,9:15
2Recent advances in organic-based materials for resistive memory applications显示文摘With the rapid development of data-driven human interaction,advanced datastorage technologies with lower power consumption,larger storage capacity,faster switching speed,and higher integration density have become the goals of future memory electronics.Nevertheless,the physical limitations of conventional Si-based binary storage systems lag far behind the ultrahigh-density requirements of post-Moore information storage.In this regard,the pursuit of alternatives and/or supplements to the existing storage technology has come to the forefront.Recently,organic-based resistive memory materials have emerged as promising candidates for next-generation information storage applications,which provide new possibilities of realizing high-performance organic electronics.Herein,the memory device structure,switching types,mechanisms,and recent advances in organic resistive memory materials are reviewed.In particular,their potential of fulfilling multilevel storage is summarized.Besides,the present challenges and future prospects confronted by organic resistive memory materials and devices are discussed.Yang Li Qingyun Qian Xiaolin Zhu Yujia Li Mayue Zhang Jingni Li Chunlan Ma Hua Li Jianmei Lu Qichun Zhang 2020InfoMat2020,2,6:7
3Carbon and carbon composites for thermoelectric applications显示文摘The urgent need for consistent,reliable,ecofriendly,and stable power sources drives the development of new green energy materials.Thermoelectric(TE)materials receive increasing attention due to their unique capability of realizing the direct energy conversion between heat and electricity,showing diverse applications in harvesting waste heat and low-grade heat.Carbon materials such as carbon nanotubes(CNTs)and graphene have experienced a rapid development as TE materials because of their intrinsic ultrahigh electrical conductivity and light weight.Besides,polymer-based carbon composites are particularly fascinating as the combination of the merits of polymers and filler materials leads to high TE performance and superior flexibility.Herein,the recent TE advances are systematically summarized in the studied popularity of carbon materials(ie,CNTs and graphene)and the category of polymers.The conducting polymer-based carbon materials are particularly highlighted.Finally,the remaining challenges and some tentative suggestions possibly guiding future developments are proposed,which may pave a way for a bright future of carbon and carbon composites in the energy market.Yichuan Zhang Qichun Zhang Guangming Chen 2020Carbon Energy2020,2,3:4
4Recent advances in vacancy engineering of metal-organic frameworks and their derivatives for electrocatalysis显示文摘The efficient electrocatalysis plays the key role in the development of electrochemical energy conversion technologies to alleviate energy crisis.Given their multiple active sites and large specific surface areas as electrocatalysts,metalorganic frameworks(MOFs)and their derivatives have attracted considerable interests in recent years.Specially,exploring the roles of the enhanced active sites inMOFs and their derivatives is significant for understanding and developing new effective electrocatalysts.Recently,the vital role of vacancies has been proven to promote electrocatalytic processes(such as H2 or O2 evolution reactions,O2 reduction reactions,and N2 reduction reactions).In order to in-depth exploring the effect of vacancies in electrocatalysts,the vacancies classification,synthetic strategy,and the recent development of various vacancies inMOFs and their derivatives for electrocatalysis are reviewed.Also,the perspectives on the challenges and opportunities of vacancies inMOFs and their derivatives for electrocatalysis are presented.Yuhang Wu Yuwen Li Junkuo Gao Qichun Zhang 2021SusMat2021,1,1:3
5A hybrid model for numerical wave forecasting and its implementation-Ⅱ .The discrete part and implementation of the model显示文摘In the first part of the present paper we have explained why we manage to formulate another wave prediction model when so many of them, including the so-called third generation model, have already been in use. The wind-wave part of the proposed model has also been given. Now we proceed to discuss the swell part,the implementation of the model as a prediction method,mumerical experiments done with ideal wind fields and hindcasts made in the Bohai Sea,in the neighboring seas adjacent to China and in the Northwest Pacific.Zhang Dacuo, Wu Zengmao, Jiang Decai, Wang Wei, Chen Bohai, Tai Weitao, Wen Shengchang,Xu Qichun and Guo Peifang 1992Acta Oceanologica Sinica1992,11,2:3
6Covalent organic framework containing dual redox centers as an efficient anode in Li-ion batteries显示文摘Covalent organic frameworks(COFs)with periodic channels and tunable chemical structures have been widely considered as promising electrode materials in rechargeable batteries.However,the design and construction of high-performance COFs-based electrodes still face some challenges in the introduction of multiple efficient redox centers as well as the reduction of dead mass.To address these issues,a unique COF containing double active centers(C═N and N═N)is developed as an anode in rechargeable lithium-ion batteries(LIBs).The as-prepared COF displays excellent electrochemical performance due to its remarkable structural stability and the existence of many active groups.Meanwhile,its electrochemical performance is significantly better than that of the small molecule compound or the linear polymer with the same construction units.Even at a high current density of 5 A/g,the LIBs with COF electrodes remain at a high discharge capacity of 227 mAh/g after 2000 cycles.Moreover,the distinction in electrochemical performances of these three materials is further revealed by calculation.This study illustrates the importance of molecular structure design for improving the performance of organic electrodes.Yifan Tong Zhaopeng Sun Jiawen Wang Weiwei Huang Qichun Zhang 2022SmartMat2022,3,4:2
7Recent advances on π-conjugated polymers as active elements in high performance organic field-effect transistors显示文摘As high-performance organic semiconductors, π-conjugated polymers have attracted much attention due to their charming advantages including low-cost, solution processability, mechanical flexibility, and tunable optoelectronic properties. During the past several decades, the great advances have been made in polymers-based OFETs with p-type, n-type or even ambipolar characterics. Through chemical modification and alignment optimization, lots of conjugated polymers exhibited superior mobilities, and some mobilities are even larger than 10 cm^(2)·V^(−1)·s^(−1) in OFETs, which makes them very promising for the applications in organic electronic devices. This review describes the recent progress of the high performance polymers used in OFETs from the aspects of molecular design and assembly strategy. Furthermore, the current challenges and outlook in the design and development of conjugated polymers are also mentioned.Lixing Luo Wanning Huang Canglei Yang Jing Zhang Qichun Zhang 2021Frontiers of physics2021,16,3:2
8Recent advances on electrochemical methods in fabricating two-dimensional organic-ligand-containing frameworks显示文摘Organic-ligand-containing frameworks have drawn considerable attention due to their multifunctional properties as well as tunable structures for broad applications.Among numerous synthesis methods developed in the past two decades,electrochemical processing has been demonstrated as one of the most efficient,safe,and facile ways to realize the large-scale and highly controllable production of organic-ligand-containing frameworks.In this review,the progress of electrochemically induced crystallization and thin film fabrication of organic-ligand-containing frameworks is summarized in a well-rounded way.Besides,the mechanism and processing parameters are also discussed.Moreover,the main challenges are also expounded for providing some guidance on the future development of organic-ligand-containing frameworks,especially for covalent-organic frameworks and hydrogen-bonded organic frameworks.Xiang Wang Pengfei She Qichun Zhang 2021SmartMat2021,2,3:2
9Highly stableβ‑ketoenamine‑based covalent organic frameworks(COFs):synthesis and optoelectrical applications显示文摘Covalent organic frameworks(COFs)are one class of porous materials with permanent porosity and regular channels,and have a covalent bond structure.Due to their interesting characteristics,COFs have exhibited diverse potential applications in many felds.However,some applications require the frameworks to possess high structural stability,excellent crystallinity,and suitable pore size.COFs based onβ-ketoenamine and imines are prepared through the irreversible enol-to-keto tautomerization.These materials have high crystallinity and exhibit high stability in boiling water,with strong resistance to acids and bases,resulting in various possible applications.In this review,we frst summarize the preparation methods for COFs based onβ-ketoenamine,in the form of powders,flms and foams.Then,the efects of diferent synthetic methods on the crystallinity and pore structure of COFs based onβ-ketoenamine are analyzed and compared.The relationship between structures and diferent applications including fuorescence sensors,energy storage,photocatalysis,electrocatalysis,batteries and proton conduction are carefully summarized.Finally,the potential applications,large-scale industrial preparation and challenges in the future are presented.Yaqin Li Maosong Liu Jinjun Wu Junbo Li Xianglin Yu Qichun Zhang 2022Frontiers of Optoelectronics2022,15,3:2
10Effect of Soil Drying Intensity During an Experimental Drying-Rewetting Event on Nutrient Transformation and Microbial Community Composition显示文摘Soil drying-rewetting(DRW) events affect nutrient transformation and microbial community composition; however, little is known about the influence of drying intensity during the DRW events. Therefore, we analyzed soil nutrient composition and microbial communities with exposure to various drying intensities during an experimental drying-rewetting event, using a silt loam from a grassland of northern China, where the semi-arid climate exposes soils to a wide range of moisture conditions, and grasslands account for over 40% of the nation's land area. We also conducted a sterilization experiment to examine the contribution of soil microbes to nutrient pulses. Soil drying-rewetting decreased carbon(C) mineralization by 9%–27%. Both monosaccharide and mineral nitrogen(N) contents increased with higher drying intensities(drying to ≤ 10% gravimetric water content), with the increases being 204% and 110% with the highest drying intensity(drying to 2% gravimetric water content), respectively, whereas labile phosphorus(P)only increased(by 105%) with the highest drying intensity. Moreover, levels of microbial biomass C and N and dissolved organic N decreased with increasing drying intensity and were correlated with increases in dissolved organic C and mineral N, respectively,whereas the increases in labile P were not consistent with reductions in microbial biomass P. The sterilization experiment results indicated that microbes were primarily responsible for the C and N pulses, whereas non-microbial factors were the main contributors to the labile P pulses. Phospholipid fatty acid analysis indicated that soil microbes were highly resistant to drying-rewetting events and that drought-resistant groups were probably responsible for nutrient transformation. Therefore, the present study demonstrated that moderate soil drying during drying-rewetting events could improve the mineralization of N, but not P, and that different mechanisms were responsible for the C, N, and P pulses observed during drying-rewetting events.SUN Dashend BI Qingfang LI Kejie ZHU Jun ZHANG Qichun JIN Chongwei LU Lingli LIN Xianyong 2018Pedosphere2018,28,4:2
11Integrated pharmacokinetics of major bioactive components in MCAO rats after oral administration of Huang-Lian-Jie-Du-Tang显示文摘Huaxu Zhu Zhilei Qian Huan Li Liwei Guo Linmei Pan Qichun Zhang Yuping Tang 2012Journal of Ethnopharmacology2012,,1:1
12Shooting flexible electronics显示文摘The trends of the future electronic devices should be miniaturized,flexible,stable,portable,light,and highly integrated.Although flexible electronic products(i.e.,flexible display products^([1-3]),batteries^([4,5]),cell phones[6])have been commercially available recently,which represents the starting of a new era in electronics,these progresses are still in their infancy and more efforts are required to boom their multifunction and speed up their marketization from lab.Considering their low-cost and mass-productive synthesis technologies,rich species,high performances,and especially,the excellent flexibility and stability,organic materials(insulating,conductive and semiconducting)have triggered the tide of the development of'plastic electronics',especially in transistors,an indispensable logic device in these logic-control based devices(i.e.,intelligent electronics).Qichun Zhang 2021Frontiers of physics2021,16,1:1
13A robust graphene oxide memristor enabled by organic pyridinium intercalation for artificial biosynapse application显示文摘Graphene oxide(GO)-based memristors offer the promise of low cost,eco-friendliness,and mechanical flexibility,making them attractive candidates for outstanding flexible electronic devices.However,their resistive transitions often display abrupt change rather than bidirectional progressive tuning,which largely limits their applications for biological synapse emulation and neuromorphic computing.Here,a memristor with a novel layered structure of GO/pyridinium/GO is presented with tunable bidirectional feature.The inserted organic pyridinium intercalation succeeds in serving as a satisfactory buffer layer to intrinsically control the formation of conductive filaments during device operation,leading to progressive conductance regulation.Thus,the essential synaptic behaviors including analog memory characteristics,excitatory postsynaptic current,paired pulse facilitation,prepulse inhibition,spike-timing-dependent plasticity,and spike-rate-dependent plasticity are replicated.The emulation of brain-like“learning-forgetting-relearning”process is also implemented.Additionally,the instant responses of the memristor can be stimulated by low operational voltages and short pulse widths.This study paves one way for GO-based memristors to actuate appealing features such as bidirectional tuning and fast speed switching that are desirable for the development of bio-inspired neuromorphic systems.Yang Li Songtao Ling Ruiyu He Cheng Zhang Yue Dong Chunlan Ma Yucheng Jiang Ju Gao Jinghui He Qichun Zhang 2023Nano Research2023,16,8:1
14Potential contributions of clay minerals and organic matter to pentachlorophenol retention in soils显示文摘Yan He Jianming Xu Haizhen Wang Qichun Zhang Akmal Muhammad 2006Chemosphere2006,,3:1
15Preconditioning with the traditional Chinese medicine Huang-Lian-Jie-Du-Tang initiates HIF-1α-dependent neuroprotection against cerebral ischemia in rats显示文摘Qichun Zhang Huimin Bian Yu Li Liwei Guo Yuping Tang Huaxu Zhu 2014Journal of Ethnopharmacology2014,,:1
16Application of Pulsed Eddy Current in Plate Thickness Evaluation显示文摘Dengfeng Chen Qichun Ji Hongcai Zhang Liang Zhao 2009ICIEA2009,97,814244280:1
17Radiation-induced tumor immune microenvironments and potential targets for combination therapy显示文摘As one of the four major means of cancer treatment including surgery,radiotherapy(RT),chemotherapy,immunotherapy,RT can be applied to various cancers as both a radical cancer treatment and an adjuvant treatment before or after surgery.Although RT is an important modality for cancer treatment,the consequential changes caused by RT in the tumor microenvironment(TME)have not yet been fully elucidated.RT-induced damage to cancer cells leads to different outcomes,such as survival,senescence,or death.During RT,alterations in signaling pathways result in changes in the local immune microenvironment.However,some immune cells are immunosuppressive or transform into immunosuppressive phenotypes under specific conditions,leading to the development of radioresistance.Patients who are radioresistant respond poorly to RT and may experience cancer progression.Given that the emergence of radioresistance is inevitable,new radiosensitization treatments are urgently needed.In this review,we discuss the changes in irradiated cancer cells and immune cells in the TME under different RT regimens and describe existing and potential molecules that could be targeted to improve the therapeutic effects of RT.Overall,this review highlights the possibilities of synergistic therapy by building on existing research.Siyu Guo Yihan Yao Yang Tang Zengfeng Xin Dang Wu Chao Ni Jian Huang Qichun Wei Ting Zhang 2023Signal Transduction and Targeted Therapy2023,8,6:1
18Dye-sensitized solar cell goes solid 显示文摘ZHANG Qichun LIU Xiaogang 2012Small2012,8,24:1
19Effect of Crystalline Microstructure Evolution on Thermoelectric Performance of PEDOT:PSS Films显示文摘Although organic polymer thermoelectric(TE)materials have witnessed explosive advances in the recent decade,the molecular mechanism of crystallization engineering of TE performance,even for the most successful polymer of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS),is still far from clear.Here,we deepen the understanding of the role of annealing-induced crystalline microstructure evolution on TE performance of the PEDOT:PSS film with thickness of 10μm,which is usually more effective than thin ones in applications.Annealed at optimized temperature of 220°C,the film displays a power factor of 162.5 times of that of the pristine film before annealing.The enhanced TE performance is associated with the changes of crystallographic and morphologic microstructures,including increased crystallinity and crystal grain size,a domain morphology transformation from granular to crystalline nanofibril,and reduced insulating PSS in the skin layer.These variances facilitate the carrier transport by a transition from 3D to 1D hopping,reduce the activation energy,and improve the carrier mobility.The mechanism of crystallization engineering reported here can be conceptually extended to other TE polymers and guides the future rational design of preparation principles for organic and composite TE materials.Xuan Huang Liang Deng Fusheng Liu Qichun Zhang Guangming Chen 2021Energy Material Advances2021,,1:1
20Evaluating the ecological performance of wetland restoration in the Yellow River Delta, China显示文摘Baoshan Cui Qichun Yang Zhifeng Yang Kejiang Zhang 2009Ecological Engineering2009,,7:1
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