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| 1 | Variations in air temperature during the last 100 years revealed by δ^(18)O in the Malan ice core from the Tibetan Plateau显示文摘By comprehensive analyses, it was found that the variations in d 18O recorded in Malan ice core from theKekexili Region on the Tibetan Plateau could represent thechanges in air temperature during the summer half year (from May to October) over the Kekexili Region and the northern margin of the Tibetan Plateau. The general increase trend in d18O in this ice core during the past century indicated climate warming, and it was estimated that air temperature during the summer half-year rose about 1.2C over there then. However, this ice core record documented that the study area has been cooling while most of the world has been dramatically warming since the late 1970s. A teleconnection was foundbetween the variations in d 18O in the Malan ice core and the North Atlantic Oscillation. Moreover, the variations in d 18O in this ice core were similar to that in the summer half-year air temperature over the southern Tibetan Plateau on thecenturial time scale, but opposite on the multidecadal timescale. | WANG Ninglian, YAO Tandong, PU Jianchen, ZHANG Yongliang, SUN Weizhen & WANG Youqing Key Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, ChineseAcademy of Sciences, Lanzhou 730000, China | 2003 | Chinese Science Bulletin2003，48，19： | 19 |
| 2 | Relative humidity reconstruction for northwestern China's Altay Mountains using tree-ring δ^(18)O显示文摘Relative humidity is an important factor in water and water vapor feedback cycles.In this study,we established a 222-year annual tree-ring δ^(18)O chronology for Siberian larch(Larix sibirica Ldb.)from the Altay Mountains in northwestern China.Climate response analyses revealed that the relative humidity was the primary factor limiting tree-ring δ^(18)O fractionation.Based on our analysis,tree-ring δ^(18)O can be used to reconstruct the July–August relative humidity based on both a reasonable mechanism of tree-ring δ^(18)O fractionation and a statistically significant regression model.We used this model to reconstruct variations in the July–August relative humidity,and the model explained 47.4% of the total variation in the measured relative humidity data from 1961 to 2011.The relative humidity in the study area increased from 1900 to the 1990s and decreased thereafter.Two regime-shift dry periods were detected during the study period(one from 1817 to 1830 and the other from 2004 to 2011). | Guobao Xu Xiaohong Liu Dahe Qin Tuo Chen Wenzhi Wang Guoju Wu Weizhen Sun Wenling An Xiaomin Zeng | 2014 | Chinese Science Bulletin2014，59，2： | 14 |
| 3 | Moisture variations over the past millennium characterized by Qaidam Basin tree-ring δ^(18)O显示文摘High-resolution tree-ring δ18O chronologies covering the last millennium,although scarce,are essential in understanding patterns of climatic changes in the northeastern region of the Qinghai-Tibetan Plateau.For this study,a tree-ring δ18O chronology with a temporal resolution of 3-years was developed from the long-lived Qilian juniper(Sabina przewalskii Kom.),extending back in time to AD 991.This long δ18O chronology was significantly correlated with the yearly δ18O in tree rings during the common period from 1800 to 2006,and was an effective proxy for relative humidity during the growing season.A low-frequency moisture pattern signified the occurrence of a slight drought during the Medieval Climate Anomaly,a marked occurrence of a wet period during the Little Ice Age,and a trend in increasing moisture levels,although lower than average,alongside the Twentieth Century warming trend.Comparisons to other hydroclimatic reconstructions indicate that this tree-ring18O chronology serves as a reliable paleo-humidity proxy for the Qaidam Basin as well as documenting details of past humidity levels in the region. | WANG WenZhi LIU XiaoHong XU GuoBao SHAO XueMei QIN DaHe SUN WeiZhen AN WenLing ZENG XiaoMin | 2013 | Chinese Science Bulletin2013，58，32： | 14 |
| 4 | Climatic significance of δ^(18)O records from precipitation on the western Tibetan Plateau显示文摘Analysis of daily precipitation samples for stable oxygen isotopes (δ18O) collected at the Shiquanhe and Gêrzê (Gaize, Gertse) stations in the Ngari (Ali) region on the western Tibetan Plateau indicates that air temperature affects the δ18O variations in precipitation at these stations. In summer, Shiquanhe and Gêrzê show strongly similar trends in precipitation δ18O, especially in simultaneous precipitation events. Moreover, both stations experienced low δ18O values in precipitation during the active monsoon period, resulting from the southwest monsoon (the summer phase of the Indian monsoon). However, during the break monsoon period (during the summer rainy season, when the monsoon circulation is disrupted), δ18O values in summer precipitation remain relatively high and local moisture recycling generally controls the moisture sources. Air temperature correlations with δ18O strengthen during the non-monsoon period (January―June, and October―December) due to continental air masses and the westerlies. In addition, evaporation also influences the δ18O variations in precipitation. The observed temporal and spatial variations of δ18O in precipitation on the western Tibetan Plateau and adjacent regions show that the late May and early June-the late August and early September time frame provides an important period for the transportation of moisture from various sources on the Tibetan Plateau, and that the region of the West Kunlun-Tanggula Ranges acts as a significant climatic divide on the Plateau, perhaps for all of western China. | YU WuSheng MA YaoMing SUN WeiZhen WANG Yu | 2009 | Chinese Science Bulletin2009，54，16： | 9 |
| 5 | Psychological impact of the COVID-19 pandemic on healthcare workers:a cross-sectional study in China显示文摘Background Healthcare workers fighting against the coronavirus disease 2019(COVID-19)pandemic are under tremendous pressure,which puts them at an increased risk of developing psychological problems.Aims This study aimed to investigate the prevalence of psychological problems in different healthcare workers(ie,physicians,medical residents,nurses,technicians and public health professionals)during the COVID-19 pandemic in China and explore factors that are associated with the onset of psychological problems in this population during this public health crisis.Methods A cross-sectional,web-based survey was conducted in February 2020 among healthcare workers during the COVID-19 pandemic.Psychological problems were assessed using the Generalized Anxiety Disorder Scale,Patient Health Questionnaire and Insomnia Severity Index.Logistic regression analyses were used to explore the factors that were associated with psychological problems.Results The prevalence of symptoms of anxiety,depression,insomnia and the overall psychological problems in healthcare workers during the COVID-19 pandemic in China was 46.04%,44.37%,28.75%and 56.59%,respectively.The prevalence of the overall psychological problems in physicians,medical residents,nurses,technicians and public health professionals was 60.35%,50.82%,62.02%,57.54%and 62.40%,respectively.Compared with healthcare workers who did not participate in front-line work,front-line healthcare workers had a higher risk of anxiety,insomnia and overall psychological problems.In addition,attention to negative or neutral information about the pandemic,receiving negative feedback from families and friends who joined front-line work,and unwillingness to join front-line work if given a free choice were three major factors for these psychological problems.Conclusions Psychological problems are pervasive among healthcare workers during the COVID-19 pandemic.Receiving negative information and participating in front-line work appear to be.important risk factors for psychological problems.The psychological health of different healthcare workers should be protected during the COVID-19 pandemic with timely interventions and proper information feedback. | Jianyu Que Le Shi Jiahui Deng Jiajia Liu Li Zhang Suying Wu Yimiao Gong Weizhen Huang Kai Yuan Wei Yan Yankun Sun Maosheng Ran Yanping Bao Lin Lu | 2020 | General Psychiatry2020，33，3： | 8 |
| 6 | Distribution of δ^(18)O in surface snow along a transect from Zhongshan Station to Dome A,East Antarctica显示文摘Surface snow samples were collected during the 14th(1997/1998)and 24th(2007/2008)Chinese National Antarctica Research Expeditions along a transect from Zhongshan Station to Dome A.The stable oxygen isotope ratios of these samples were measured to investigate their relationships with temperature and geographical parameters(latitude,longitude,altitude and distance to the coast).The results reveal a strong positive correlation(R=0.945)betweenδ18O and mean annual temperature,with a gradient of 0.84‰°C-1,which is a little higher than that in Terre Adelie Land.Regression analyses also show that theδ18O of surface snow is strongly correlated with distance to the coast(R=0.942),latitude(R=0.942),and altitude(R=0.941).But no significant correlation was found betweenδ18O and longitude in study area.Altitude should be the most important factor influencing the δ18O distribution because of distinctive topography.Theδ18O-altitude and T-altitude gradients along this transect are determined to be-1.1‰/100 m and 1.31°C/100 m,respectively. | DING MingHu XIAO CunDe JIN Bo REN JiaWen QIN DaHe SUN WeiZhen | 2010 | Chinese Science Bulletin2010，55，24： | 7 |
| 7 | Low frequency oscillation characteristics of East China Power Grid after commissioning of Huai-Hu ultra-high voltage alternating current project显示文摘The low frequency oscillation characteristics of East China Power Grid after commissioning of the first ultra-high voltage alternating current(UHVAC)project-the Huai-Hu UHVAC project are studied.Several low frequency oscillation cases occurred in East China Power Grid in the past few years are reviewed and summarized.Based on the analysis of the different typical operation modes,the main low frequency oscillation modes in East China Power Grid in the early stages of development of ultra-high voltage(UHV)are summarized,and the impacts of the significant power grid maintenance on low frequency oscillation characteristics are analyzed.Besides,the oscillation mode of UHV generators to East China Power Grid is researched,and the importance of the power system stabilizator(PSS)is emphasized.Furthermore,the comparative analysis between the time domain and the frequency domain is carried out,and the influences of the governing system on low frequency oscillation characteristics are revealed.Finally,both the focus and the direction of low frequency oscillation research are presented. | Chao WANG Yang LV Hongyang HUANG Jing ZHANG Jihong LI Yingyi LI Weizhen SUN Yong CHANG | 2015 | Journal of Modern Power Systems and Clean Energy2015，3，3： | 6 |
| 8 | Response of monsoon vari-ability in Himalayas to global warming显示文摘Reconstructed annual net accumulation from the Dasuopu ice core recovered in Himalayas, with a good correlation to Indian monsoon, reflects a major precipitation trend in central Himalayas. The Dasuopu accumulation (DSP An) also shows a strong correlation to the Northern Hemispheric temperature. Generally, as the Northern Hemispheric temperature increases by 0.1 K, the accumulation decreases by about 90 mm and vise versa. Under the condition of global warming, especially since 1920, the Northern Hemispheric mean temperature has increased by about 0.5 K, whereas accumulation in Dasuopu ice core has decreased by about 450 mm. According to the relationship between accumulation and temperature, a scenario prediction of monsoon rainfall in central Himalayas is made. | DUAN Keqin YAO Tandong PU Jianchen SUN Weizhen | 2002 | Chinese Science Bulletin2002，47，21： | 6 |
| 9 | Alkylation kinetics of isobu-tane by C4olefins using sulfuric acid as catalyst显示文摘 | Sun Weizhen Shi Yi Chen Jie | 2013 | Industrial andEngineering Chemistry Research2013，52，15： | 1 |
| 10 | One-pot synthesis of 2,5-bis(hydroxymethyl)furan from biomass derived 5-(chloromethyl)furfural in high yield显示文摘5-(Chloromethyl)furfural(CMF),as a new platform molecular,has become a hot topic in the field of biorefinery.Herein,the one-pot conversion of CMF to 2,5-bis(hydroxymethyl)furan(BHMF)in the water phase was demonstrated for the first time.A 91%BHMF yield was obtained over Ru/Cu Oxcatalyst,and BHMF was mainly produced by the consecutive hydrolysis and hydrogenation of CMF with 5-hydroxymethylfurfural(HMF)as an intermediate.Kinetic studies revealed that the conversion of HMF to BHMF was the rate-determining step.Remarkably,the characterizations and density functional theory(DFT)calculations further revealed the lower electron density of Ru NPs in Ru/Cu Oxcatalyst,resulting in a larger adsorption energy and a smaller free energy difference for the formation of alcohols.The present findings offered a new pathway for biomass-derived diol production through CMF as a potential source. | Binglin Chen Yunchao Feng Sen Ma Weizhen Xie Guihua Yan Zheng Li Jonathan Sperry Shuliang Yang Xing Tang Yong Sun Lu Lin Xianhai Zeng | 2023 | Journal of Energy Chemistry2023，，1： | 1 |
| 11 | Simplified free-radical reaction kinetics for p-xylene oxidation to terephthalic acid 显示文摘 | Sun Weizhen Pan Yi Zhao Ling Zhou Xinggui | 2008 | Chemical Engineering Technology2008，31，10： | 1 |
| 12 | Base-free oxidative esterification of 5-hydroxymethylfurfural to furan-2,5-dimethylcarboxylate over n-doped carbon-supported Co/Fe bimetallic catalyst under batch-operation or continuous-flow conditions显示文摘Developing an efficient and easily available catalyst for the selective conversion of biomass-derived 5-hydroxymethylfurfural(HMF)into furan-2,5-dimethylcarboxylate(FDMC),a valuable biomass-based monomer,remains a high demand but formidable challenge.Herein,a facile strategy for the synthesis of N-doped carbon-supported Co/Fe bimetallic catalyst(CoFe-NC)was developed,which provided an outstanding FDMC yield of 93%in a batch reactor(base-free,80℃,2 bar O_(2),4 h).Interestingly,CoFe-NC also gave a high FDMC yield of 91%under continuous-flow conditions for 80 h(5 bar O_(2),80℃,GHSV 1320 h^(-1),LHSV 0.6 h^(-1),base-free).Notably,it is the first time that a non-noble catalyst gave such a high FDMC yield under continuous-flow conditions.The introduction of Fe could greatly improve both the electron intensity of Co-N_(x)species and basicity of the catalyst,which endowed CoFe-NC with improved O_(2)activation capacity and enhanced dehydrogenation activity for the oxidation-esterification of HMF.This work delineates the efficient strategy on the construction of N-doped carbon-supported non-noble catalyst,which might open a new avenue for developing highly efficient catalyst for FDMC production. | Weizhen Xie Binglin Chen Wenlong Jia Huai Liu Zheng Li Shuliang Yang Xing Tang Xianhai Zeng Yong Sun Xixian Ke Tianyuan Li Huayu Fang Lu Lin | 2022 | Journal of Energy Chemistry2022，，12： | 1 |
| 13 | Application and verification of simultaneous determination of cellulose δ^(13)C and δ^(18)O in Picea shrenkiana tree rings from northwestern China using the high-temperature pyrolysis method显示文摘Stable isotopes in tree-ring cellulose provide important data in ecological,archaeological,and paleoenvironmental researches,thereby,the demand for stable isotope analyses is increasing rapidly.Simultaneous measurement of cellulose δ^(13)C and δ^(18)O values from tree rings would reduce the cost of isotopic commodities and improve the analytical efficiency compared with conventional separate measurement.In this study,we compared the δ^(13)C and δ^(18)O values of tree-ringα-cellulose from Tianshan spruce(Picea schrenkiana)in an arid site in the drainage basin of the Urumqi River in Xinjiang of northwestern China based on separate and simultaneous measurements,using the combustion method(at1050°C)and the high-temperature pyrolysis method(at 1350°C and 1400°C).We verified the results of simultaneous measurement using the outputs from separate measurement and found that both methods(separate and simultaneous)produced similar δ^(13)C values.The two-point calibrated method improved the results(range and variation)of δ^(13)C and δ^(18)O values.The mean values,standard deviations,and trends of the tree-ring δ^(13)C obtained by the combustion method were similar to those by the pyrolysis method followed by two-point calibration.The simultaneously measured δ^(18)O from the pyrolysis method at 1400°C had a nearly constant offset with that the pyrolysis method at 1350°C due to isotopic-dependence on the reaction temperature.However,they showed similar variations in the time series.The climate responses inferred from simultaneously and separately measured δ^(13)C and δ^(18)O did not differ between the two methods.The tree-ring δ^(13)C and δ^(18)O values were negatively correlated with standardized precipitation evapotranspiration index from May to August.In addition,the δ^(18)O was significantly correlated with temperature(positive),precipitation(negative),and relative humidity(negative)from May to August.The tree-ring δ^(13)C and δ^(18)O values determined simultaneously through the high-temperature pyrolysis method could produce acceptable and reliable stable isotope series.The simultaneous isotopic measurement can greatly reduce the cost and time requirement compared with the separate isotopic measurement.These results are consistent with the previous studies at humid sites,suggesting that the simultaneous determination of δ^(13)C and δ^(18)O in tree-ringα-cellulose can be used in wide regions. | XU Guobao LIU Xiaohong SUN Weizhen CHEN Tuo ZHANG Xuanwen ZENG Xiaomin WU Guoju WANG Wenzhi QIN Dahe | 2018 | Journal of Arid Land2018，10，6： | 1 |
| 14 | Modeling of CO2-assisted liquid phase oxidation of para-xylene catalyzed by transition metals/bromide 显示文摘 | Shang Jianping Sun Weizhen Zhao Ling Yuan Weikang | 2015 | Chemical Engineering Science2015，127，： | 1 |
| 15 | Source of major ions from an ice core of the No.12 Glacier in Laohugou Valley,Qilian Mountain显示文摘In June 2006,a 20.12 m shallow ice core was recovered from an elevation of 5,040 m in the northern branch firn basin of No.12 Glacier,Great Snow Mountain,in the western part of Qilian Mountain,China.Isotopes(δ 18 O),major soluble ions,and radionuclide(β-activity) measurements from the ice core revealed a 46-year record(1960-2006).In this paper,the method of sea-salt ion tracer,correlation analysis and trend analysis were used in this research to confirm the source of the chemical composition.The correlation analysis and HYSPLIT backward trajectory analysis suggests that atmospheric soluble dust species dominate the chemical signature. | XiaoQing Cui JiaWen Ren Xiang Qin WenTao Du WeiJun Sun GuangMingYu XiaoXiang Wang WeiZhen Sun | 2010 | Research in Cold and Arid Regions2010，2，6： | 1 |
| 16 | Patterning the neuronal cells via inkjet printing of self-assembled peptides on silk scaffolds显示文摘The patterning of neuronal cells and guiding neurite growth are important for neuron tissue engineering and cell-based biosensors. In this paper, inkjet printing has been employed to pattern self-assembled I_3 QGK peptide nanofibers on silk substrates for guiding the growth of neuron-like PC12 cells. Atomic force microscopy(AFM)confirmed the dynamic self-assembly of I_3 QGK into nanofiber structures. The printed self-assembled peptide strongly adheres to regenerated silk fibroin(RSF) substrates through charge-charge interactions. It was observed that in the absence of I_3 QGK, PC12 cells exhibited poor attachment to RSF films, while for RSF surfaces coated or printed with peptide nanofibers, cellular attachment was significantly improved in terms of both cell density and morphology. AFM results revealed that peptide nanofibers can promote the generation of axons and terminal buttons of PC12 cells, indicating that I_3 QGK nanofibers not only promote cellular attachment but also facilitate differentiation into neuronal phenotypes. Inkjet printing allows complex patterning of peptide nanofibers onto RSF substrates, which enabled us to engineer cell alignment and provide an opportunity to direct axonal development in vitro. The live/dead assay showed that printed I_3 QGK patterns exhibit no cytotoxicity to PC12 cells demonstrating potential for future nerve tissue engineering applications. | Weizhen Sun Yi Zhang David A.Gregory Ana Jimenez-Franco Mhd Anas Tomeh Songwei Lv Jiqian Wang John W.Haycock Jian R.Lu Xiubo Zhao | 2020 | Progress in Natural Science:Materials International2020，30，5： | 1 |
| 17 | Alkylation kinetics of isobutane by C4 olefms using sulfuric acid as catalyst 显示文摘 | Sun Weizhen Shi Yi Chen Jie Xi Zhenhao Zhao Ling | 2013 | Industrial & Engineering Chemistry Research2013，52，15： | 1 |
| 18 | Temperature and methane records over the last 2 ka in Dasuopu ice core显示文摘 | Tandong Yao L. G. Thompson Keqin Duan Baiqing Xu Ninglian Wang Jianchen Pu Lide Tian Weizhen Sun Shichang Kang Xiang Qin | 2002 | Science in China Series D: Earth Sciences2002，，12： | 1 |
| 19 | Temperature and methane records over the last 2 ka in Dasuopu ice core显示文摘 | Tandong Yao L. G. Thompson Keqin Duan Baiqing Xu Ninglian Wang Jianchen Pu Lide Tian Weizhen Sun Shichang Kang Xiang Qin | 2002 | Science in China Series D: Earth Sciences2002，，12： | 1 |
| 20 | Temperature and methane records over the last 2 ka in Dasuopu ice core显示文摘 | Tandong Yao L. G. Thompson Keqin Duan Baiqing Xu Ninglian Wang Jianchen Pu Lide Tian Weizhen Sun Shichang Kang Xiang Qin | 2002 | Science in China Series D: Earth Sciences2002，，12： | 1 |
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