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| 1 | Spatial-temporal Pattern and Population Driving Force of Land Use Change in Liupan Mountains Region, Southern Ningxia, China显示文摘The Liupan Mountains is located in the southern Ningxia Hui Autonomous Region of China, which forms an important dividing line between landforms and bio-geographic regions. The populated part of the Liupan Mountains region has suffered tremendous ecological damages over time due to population pressure, excessive demand and inappropriate use of agricultural land resources. In this paper, datasets of land use between 1990 and 2000 were obtained from Landsat TM imagery, and then spatial models were used to characterize landscape conditions. Also, the relationship between the population density and land use/cover change (LUCC) was analyzed. Results indicate that cropland, forestland, and urban areas have increased by 44,186ha, 9001ha and 1550ha, respectively while the grassland area has appreciably decreased by 54,025ha in the study period. The decrease in grassland was most notable. Of the grassland lost, 49.4% was converted into cropland. The largest annual land conversion rate in the study area was less than 2%. These changes are attributed to industrial and agricultural development and population growth. To improve the eco-economic conditions in the study region, population control, urbanization and development of an ecological friendly agriculture were suggested. | QUAN Bin M J M ROMKENS TAO Jianjun LI Bicheng LI Chaokui YU Guanghui CHEN Qichun | 2008 | Chinese Geographical Science2008，18，4： | 15 |
| 2 | Impacts 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 | 2015 | Journal of Geographical Sciences2015，25，9： | 15 |
| 3 | Human γδT-cell subsets and their involvement in tumor mmunity显示文摘 | Dang W u Pin Wu Fuming Qiu Qichun Wei Jian Huang | 2017 | Cellular & Molecular Immunology2017，14，3： | 11 |
| 4 | Recent 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 | 2020 | InfoMat2020，2，6： | 7 |
| 5 | Advances of stereotactic body radiotherapy in pancreatic cancer显示文摘Pancreatic cancer(PCA) is one of the most aggressive tumors with few effective treatment modalities. It is the 4th and 7th leading cause of cancer death in the United States and China, respectively. At the time of diagnosis, only 20% of cases present with a resectable tumor, and about 40% with a locally advanced tumor that is considered unresectable. Even resected patients still have a poor prognosis, with an incidence of local recurrence ranging from 20% to 60%. It is also reported that up to 30% of PCA patients die from locally obstructive disease with few or no distant metastases. These findings have highlighted the importance of local radiation therapy in the treatment of PCA. As the role of conventional chemoradiotherapy remains controversial, the dawn of the pancreas stereotactic body radiation therapy(SBRT) era represents a potential paradigm shift in the management of PCA. SBRT delivers a higher biological effective dose to the tumor with sharp dose escalation in a shorter treatment time course. Pancreas SBRT is a novel therapeutic option to achieve local tumor control with minimal toxicity. Herein, we review the advancement of SBRT for PCA patients with different stages of pancreatic adenocarcinoma. | Qichun Wei Wei Yu Lauren M.Rosati Joseph M.Herman | 2015 | Chinese Journal of Cancer Research2015，27，4： | 5 |
| 6 | Carbon 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 | 2020 | Carbon Energy2020，2，3： | 4 |
| 7 | Recent 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 | 2021 | SusMat2021，1，1： | 3 |
| 8 | A new family of differentially 4-uniform permutations over F_(2^(2k))for odd k显示文摘We study the differential uniformity of a class of permutations over F2 n with n even. These permutations are different from the inverse function as the values x^(-1) are modified to be(γx)^(-1) on some cosets of a fixed subgroup γ of F_(2n)~*. We obtain some sufficient conditions for this kind of permutations to be differentially 4-uniform, which enable us to construct a new family of differentially 4-uniform permutations that contains many new Carlet-Charpin-Zinoviev equivalent(CCZ-equivalent) classes as checked by Magma for small numbers n. Moreover, all of the newly constructed functions are proved to possess optimal algebraic degree and relatively high nonlinearity. | PENG Jie TAN ChikHow WANG QiChun | 2016 | Science China Mathematics2016，59，6： | 3 |
| 9 | A 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 | 1992 | Acta Oceanologica Sinica1992，11，2： | 3 |
| 10 | 双季晚稻田大面积放养固氮蓝藻的试验显示文摘通过晚稻田大面积放养固氮蓝藻试验,我们初步提出了土池大量培养和茬口田大面积生产藻种等一系列的培养和生产藻种的技术措施;生产了30吨的鲜藻种接种到晚稻田中。经过加强管理,先锋大队990亩晚稻田全部养藻化。接种的藻生长旺盛,平均产量达到1000斤/亩以上。抽样测产估计,晚稻田中鲜藻量达到500吨。晚稻田养藻使水稻增产约10%,个别达到20%以上。因此,晚稻田放养固氮蓝藻为晚稻开辟了新的有希望的肥源。 | Section of Experimental Algal Ecology, Fifth Laboratory, Instituteof Hydrobiology, Academia SinicaCommittee of Management of Sciences and Technology andXianfeng Production Brigade, Xinshenghuo People’sCommune, Qichun County, Hubei Province. | 1978 | 水生生物学集刊1978，6，3： | 3 |
| 11 | Investigation of tribological characteristics of nickel alloybased solid-lubricating composites at elevated temperatures under vacuum显示文摘The development of a high‐performance solid‐lubricating composite with excellent self‐lubricity over a broad temperature range in vacuum is significant to solve the frictional problems of spatial mechanisms.In this study,the vacuum tribological behaviors of nickel‐matrix/Ag/(Ca,Ba)F2/graphite(0–2 wt%)composites were studied from 25 to 800°C.The results show that the synergistic effects of solid lubricants can significantly improve the tribological properties of the composites in vacuum,with the graphite content contributing considerably.For 2 wt%graphite,a low friction coefficient(0.14–0.25)and the lowest wear rate((0.12–4.78)×10^(-5) mm^(3)∙N^(-1)∙m^(-1))were observed in vacuum over the entire testing temperature range.Moreover,the wear mechanisms were clarified via analysis of the chemical composition and morphologies of the sliding surfaces. | Jinming ZHEN Jun CHENG Hui TAN Qichun SUN Shengyu ZHU Jun YANG Weimin LIU | 2021 | Friction2021，9，5： | 2 |
| 12 | Alkylation of Isobutane and Isobutene in Acidic Polyether Ionic Liquids显示文摘The Br?nsted-acidic polyether ionic liquids(ILs)with different polymerization degrees(n value)were prepared via the reaction of tetramethylguanidine and epoxy ethane,followed by successive reactions with 1,3-propane sultone and trifluoromethanesulfonic acid(TfOH).The prepared ILs were characterized by infrared spectroscopy and 1H nuclear magnetic resonance spectroscopy,and their thermal stability was determined by thermal gravimetry.The synthesized polyether ILs coupled with TfOH were used to catalyze the alkylation reaction of isobutane and isobutene for the preparation of alkylate gasoline.The polyether ILs could improve the substrate dissolution and promote the separation of the catalyst from the products.The ideal IL(n=94)was determined.The optimized alkylation reaction conditions covered:a VTfOH/VIL ratio of 0.35,a reaction temperature of 40℃,a reaction time of 50 min,and a stirring speed of 800 r/min.The conversion of isobutene was 92.4%and the selectivity for the C8-product was 81.6%.Under optimal conditions,the catalyst life was determined and TfOH showed improved cyclic performance in the polyether ILs.After 8 operating cycles,the catalytic activity of the catalyst showed negligible decline. | Yu Fengli Gu Yulong Liu Qichun Xie Congxia | 2019 | China Petroleum Processing & Petrochemical Technology2019，21，3： | 2 |
| 13 | Morphological MRI and T2 mapping of cartilage repair tissue after mosaicplasty with tissue-engineered cartilage in a pig model显示文摘The aim of this study was to evaluate the efficacy of mosaicplasty with tissue-engineered cartilage for the treatment of osteochondral defects in a pig model with advanced MR technique.Eight adolescent miniature pigs were used.The right knee underwent mosaicplasty with tissue-engineered cartilage for treatment of focal osteochondral defects,while the left knee was repaired via single mosaicplasty as controls.At 6,12,18 and 26 weeks after surgery,repair tissue was evaluated by magnetic resonance imaging(MSI)with the cartilage repair tissue(MOCART)scoring system and T2mapping.Then,the results of MRI for 26 weeks were compared with findings of macroscopic and histologic studies.The MOCART scores showed that the repaired tissue of the tissue-engineered cartilage group was statistically better than mat of controls(P<0.001).A significant correlation was found between macroscopic and MOCART scores(P<0.001).Comparable mean T2 values were found between adjacent cartilage and repair tissue in the experimental group(P>0.05).For zonal T2 value evaluation,there were no significant zonal T2 differences for repair tissue in controls(P>0.05).For the experimental group,zonal T2 variation was found in repair tissue(P<0.05).MRI,macroscopy and histology showed better repair results and bony incorporation in mosaicplasty with the tissue-engineered cartilage group than those of the single mosaicplasty group.Mosaicplasty with the tissue-engineered cartilage is a promising approach to repair osteochodndral defects.Morphological MRI and T2 mapping provide a non-invasive method for monitoring the maturation and integration of cartilage repair tissue in vivo. | Qichun Chen Qiang Zuo Qianqian Hu Yang Feng Weiding Cui Weimin Fan Yuefen Zou | 2014 | The Journal of Biomedical Research2014，28，4： | 2 |
| 14 | Chitosan-Zn Chelate Increases Antioxidant Enzyme Activity and Improves Immune Function in Weaned Piglets显示文摘 | Yuanfei Ma Qichun Huang Mengyuan Lv Zhipeng Wu Zhengjun Xie Xinyan Han Yizhen Wang | 2014 | Biological Trace Element Research2014，，1： | 2 |
| 15 | Covalent 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 | 2022 | SmartMat2022，3，4： | 2 |
| 16 | Recent 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 | 2021 | Frontiers of physics2021，16，3： | 2 |
| 17 | Recent 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 | 2021 | SmartMat2021，2，3： | 2 |
| 18 | Study on the Driveability During Engine Start Process for A P2 Hybrid Vehicle显示文摘 | Wang Junhua Sun Qichun Cao Jian | 2017 | 汽车技术2017，，9： | 2 |
| 19 | Highly 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 | 2022 | Frontiers of Optoelectronics2022，15，3： | 2 |
| 20 | Effect 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 | 2018 | Pedosphere2018，28，4： | 2 |
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