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| 1 | Late Holocene hydroclimatic variations and possible forcing mechanisms over the eastern Central Asia显示文摘Hydroclimatic variations over the eastern Central Asia are highly sensitive to changes in hemispheric-scale atmospheric circulation systems. To fully understand the long-term variability and relationship between hydroclimate and atmospheric circulation system, we present a high-resolution lascustrine record of late Holocene hydroclimate from Lake Sayram, Central Tianshan Mountains, China, based on the total organic carbon, total nitrogen, and carbonate contents, carbon/nitrogen ratios, and grain size. Our results reveal four periods of substantially increased precipitation at the interval of 4000–3780, 3590–3210, 2800–2160, and 890–280 cal yr BP, and one period of slightly increased precipitation from 1700–1370 cal yr BP. These wetter periods broadly coincide with those identified in other records from the mid-latitude Westerlies-dominated eastern Central Asia, including the northern Tibetan Plateau. As such, a similar hydroclimatic pattern existed over this entire region during the late Holocene. Based on a close similarity of our record with reconstruction of North Atlantic Oscillation indices and solar irradiance, we propose that decreased solar irradiance and southern migration of the entire circum-North Atlantic circulation system, particularly the main pathway of the mid-latitude Westerlies, significantly influenced hydroclimate in eastern Central Asia during the late Holocene. Finally, the inferred precipitation at Lake Sayram has increased markedly over the past 100 years, although this potential future changes in hydroclimate in Central Asia need for further investigation. | Jianghu LAN Hai XU Keke YU Enguo SHENG Kangen ZHOU Tianli WANG YuANDa YE Dongna YAN Huixian WU Peng CHENG Waili ABULIEZI Liangcheng TAN | 2019 | Science China Earth Sciences2019，62，8： | 3 |
| 2 | Novel internal photoemission in manganite/ZnO heterostructure显示文摘A novel photovoltaic phenomenon of internal photoemission was found in a low cost manganite La0.62Ca0.29K 0.09MnO3 (LCKMO)/zinc oxide (ZnO) heterojunction bilayers grown on ITO substrate by pulsed laser deposition (PLD) at relative low growth temperature. The heterostructure ITO/LCKMO/ZnO/Al exhibits reproducible rectifying characteristics and light current under continuous laser irradiation of = 325 nm. We report here the influence of LCKMO/ZnO bilayers' thickness on the electrical and photoelectric properties of the heterostructure at room temperature. The power conversion efficiency (PCE) is achieved when the LCKMO and ZnO layers are thin enough or the full space charge layer is sufficient. We obtained the maximum value of PCE of 0.0145% when the thicknesses of LCKMO and ZnO layers are 25 and 150 nm, respectively. The open circuit voltage is 0.04 V under this condition due to the internal photoemission. | ZHANG JiaQi HUANG KeKe SI WenZhe WU XiaoFeng CHENG Gang FENG ShouHua | 2013 | Science China Chemistry2013，56，5： | 2 |
| 3 | Injectable silk/hydroxyapatite nanocomposite hydrogels with vascularization capacity for bone regeneration显示文摘Localized and sustained osteogenic-angiogenic stimulation to bone defects is critical for effective bone repair.Here,desferrioxamine(DFO)was loaded on silk fibroin nanofibers and blended with hydroxyapatite nanorods(HA),forming injectable DFO-loaded silk fibroin-HA nanocomposite hydrogels.The composite hydrogels remained homogeneous distribution of HA with high ratio(60%)and also higher stiffness than that of pure silk fibroin nanofiber hydrogels,which provided stable osteogenic stimulation niches for tissue regeneration.Without the scarify of injectability,the hydrogels achieved slow delivery of DFO for above 60 days,resulting in suitable angiogenesis in vitro and in vivo and better osteogenesis than DFO-free systems.Compared to previous injectable silk fibroin-HA hydrogels,the introduction of vascularization capacity further stimulated the osteogenic differentiation of stem cells and accelerated new bone formation.Quicker and better bone healing were detected at defect sites after the injection of DFO-loaded nanocomposite hydrogels,indicating the effective synergistic effect of osteogenic and angiogenic cues.This work provides a simple and effective strategy of introducing angiogenic cues to bone matrices.We believe that the injectable nanocomposite hydrogels are suitable for the regeneration of bone tissues. | Keke Wang Weinan Cheng Zhaozhao Ding Gang Xu Xin Zheng Meirong Li Guozhong Lu Qiang Lu | 2021 | Journal of Materials Science & Technology2021，，4： | 2 |
| 4 | Enhancement of the enzymatic digestibility of sugarcane bagasse by alkali-per?acetic acid pretreatment显示文摘 | Zhao Xuebing Peng Feng Cheng Keke | 2009 | Enzyme and Microbial Technolo?gy2009，44，1： | 1 |
| 5 | Enhancement of the enzymatic digestibility of sugarcane bagasse by alkali–peracetic acid pretreatment显示文摘 | Xuebing Zhao Feng Peng Keke Cheng Dehua Liu | 2008 | Enzyme and Microbial Technology2008，，1： | 1 |
| 6 | Effect of transplantation with autologous bone marrow stem cells on acute myocardial infarction显示文摘 | Chaoquan Peng Ke Yang Peng Xiang Chengxi Zhang Liyuan Zou Xiao Wu Ya Gao Zhuang Kang Keke He Jinlai Liu Muhua Cheng Jingfeng Wang Lin Chen | 2011 | International Journal of Cardiology2011，，： | 1 |
| 7 | Optimization of pH and acetic acid concentration for bioeonversion of hemicellulose from corncobs to xylitol by Candida tropicalis 显示文摘 | Cheng Keke Zhang Jianan Ling Hongzhi | 2009 | Biochemical Engineering Journal2009，43，2： | 1 |
| 8 | Enhancement of the enzymatic digestibility of sugarcane bagasse by alkali-peracetic acid pretreatment显示文摘 | Xuebing Zhao FengPeng Keke Cheng | 2009 | Enzyme and Microbial Technology2009，440，： | 1 |
| 9 | Improved 2,3-bu- tanediol production from corncob acid hydrolysate by fed-batch fermentation using Klebsiella oxytoca 显示文摘 | Cheng Keke Liu Qing Zhang Jianan | 2010 | Process Biochemistry2010，45，4： | 1 |
| 10 | Effect of culture conditions on 3 -hydroxypropionaldehyde detoxi-fication in 1,3-propanediol fermentation by Klebsiella pneumoniae 显示文摘 | Zheng Zongming Cheng Keke Hu Qiulong | 2008 | Biochem Eng J2008，39，2： | 1 |
| 11 | Organosolv pretreatment of lignocellulosic biomass for enzymatic hydrolysis显示文摘 | Xuebing Zhao Keke Cheng Dehua Liu | 2009 | Applied Microbiology and Biotechnology2009，，5： | 1 |
| 12 | Fermentation of pretreated sugarcane bagasse hemicellulose hydrolysate to ethanol by Pachysolen tannophilus 显示文摘 | Cheng Keke Ge Jingping Zhang Jianan | 2007 | Biotechnol Lett2007，，29： | 1 |
| 13 | Sugarcane Bagasse Mild Alkaline / Oxidative Pretreatment for Ethanol production by Alkaline Recycle Process 显示文摘 | Cheng Keke Zhang Jianan Ping Wenxiang | 2008 | Appl Biochem Biotechnol2008，151，1： | 1 |
| 14 | Organosolv pretreatment of lignocellulosic biomass for enzymatic hydrolysis显示文摘 | Zhao Xuebing Cheng Keke Liu Dehua | 2009 | Appl Microbiol Biotechnol2009，82，5： | 1 |
| 15 | Integrated production of xylitol and ethanol using corn cob显示文摘 | Cheng Keke Zhang Jian'an Erik Chavez | 2010 | Appl Microbiol Biotechnol2010，87，2： | 1 |
| 16 | Integrat- ed production of xylitol and ethanol using corn cob 显示文摘 | Cheng Keke Zhang Jian'an Erik Chavez | 2010 | Appl Microbiol Biotechnol2010，87，2： | 1 |
| 17 | Enhancement of the enzymatic digestibility of sugarcane bagasse by alkali- peracetic acid pretreatment显示文摘 | Zhao Xuebing Peng Feng Cheng Keke | 2009 | Enzyme and Microbial Technology2009，44，： | 1 |
| 18 | Enhancement of the enzymatic digestibility of sugarcane bagasse by alkali-peracetic acid pretreatment 显示文摘 | XUEBING ZHAOA FENG PENGB KEKE CHENG et al | 2009 | Enzyme and Microbial Technology Enzyme and Microbial Technology2009，44，1： | 1 |
| 19 | Improved 2,3-butanediol production from corncob acid hydrolysate by fed-batch fermentation using Klebsiella oxytoca显示文摘 | Cheng Keke Liu Qing Zhang Jian'an | 2010 | Process Biochemistry2010，45，4： | 1 |
| 20 | Micro-interfaces modulation by UV-ozone substrate treatment for MPEA vapor fluorescence detection显示文摘Drug abuse directly endangers human health and social security,hence its sensitive and rapid detection is vitally important.In recent years,organic film-based fluorescent sensing technology has attracted more and more attention in the detection of drugs and explosives due to its advantages of simple operation and rapid detection.For film-based fluorescent sensors,in addition to sensitive materials,the surface morphology of the film is also an important factor affecting the performance.In previous studies,the regulation of surface morphology mainly depends on concentration changes or complex templates.Here,a novel fluorescent polymer probe was designed and synthesized,and a simple and efficient ultraviolet(UV)-ozone substrate treatment method is used to adjust their surface morphology.The results show that film has an excellent fluorescence enhancement effect upon exposure to methylphenethylamine(MPEA,a simulant of methamphetamine)vapor.The sensing effect of the film is significantly improved after UV-ozone substrate treatment,and the limit of detection was decreased by 10.4 times from 2.59 to 0.25 ppm.Further experiments show that the sensing performance of other fluorescent probe can also be improved by the UV-ozone substrate treatment.This convenient and general method may become a very effective approach to improve the performance of film-based fluorescent sensors. | Bin Li Keke Li Wei Xu Mingzhu Yan Jianhao Zhao Wukun Zhang Mingshuai Yuan Yanyan Fu Qingguo He Jiangong Cheng | 2023 | Nano Research2023，16，3： | 0 |
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