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| 1 | The Dry-Cold Climate of the Qijia Archeological Civilization in Chankou of the Loess Plateau along the Silk Road Since the Neolithic Period显示文摘Objective Large numbers of archeological relics from the Neolithic period are widely distributed in all tributaries of the Yellow River.The early humans tended to reside along the river valleys,and developed small but characteristically decentralized ancient valley culture.It is universally acknowledged that the agriculture exchange between China and western countries and the moderate climate pushed the Neolithic culture prosperity (Chen et al.,2015;Liu Lian et al.,2016;An Chengbang et al.,2017). | ZHANG Huirong DEMBELE Blaise ZHANG Wanyi ZHANG Jingya MA Yuan ZHANG Chengjun | 2018 | Acta Geologica Sinica(English Edition)2018，92，6： | 4 |
| 2 | Weak Summer Monsoon during the Early Holocene Inferred from the Dingxi Lujiagou Floodplain Lake-Eolian Sand Rhythm due to Solar Impacting显示文摘Objective Precipitation was the highest in the loess plateau during the Early Holocene 10-8 ka BP even to the period 10-3.0 ka BP in the Kesang cave stalagmite westward Tianshan,Xinjiang,based on large numbers of records from paleoclimatic proxies(An et al.,2000;Zhang et al.,2009;Zhang et al.,2018).However,we discovered at first time that floodplain lake-eolian stratigraphical rhythm complex kept in the Lujiagou of Dingxi,Gansu,which was important geological proof to indicate a weak summer monsoon transition period during the Early Holocene in the Chinese Loess Plateau. | ZHANG Wanyi ZHANG Huirong MA Yuan WANG Xiaoyu Steffen MISCHKE ZHANG Chengjun | 2019 | Acta Geologica Sinica(English Edition)2019，93，3： | 3 |
| 3 | Existence and uniqueness of positive solutions for fourth-order nonlinear singular continuous and discrete boundary value problems显示文摘 | Yuan Chengjun Jiang Daqing O' Regan Donal | 2008 | Applied Mathematics and Computation2008，203，： | 1 |
| 4 | The positive properties of the Green function for Dirichlet-type boundary value problems of nonlinear fraction-al differential equations and its application显示文摘 | Daqing Jiang Chengjun Yuan | 2010 | Nonlinear Analysis2010，，72： | 1 |
| 5 | Multiple positive solutions for the boundary value problem of a nonlinear fractional differential e-quation显示文摘 | Xiaojie Xu Daqing Jiang Chengjun Yuan | 2009 | Nonlinear Analysis2009，，71： | 1 |
| 6 | Existence and uniqueness of solutions for singular higher order continuous and discrete boundary value problems显示文摘 | Chengjun Yuan Daqing Jiang and You Zhang | 2008 | Boundary Value Problems2008，，： | 1 |
| 7 | Multiple positive solutions for the boundary value problem of a nonlinear fractional differential equation显示文摘 | Xiaojie Xu Daqing Jiang Chengjun Yuan | 2009 | Nonlinear Analysis2009，，10： | 1 |
| 8 | Research on characteristics of acoustic signal of typical partial discharge models显示文摘The pulse current method,acoustic and ultrasonic partial discharge(PD)detection,and voiceprint PD detection are commonly used detection methods for the PD detection of power equipment.To study the characteristics of PD signals of typical discharge models based on the principles of the above three detection methods,an acoustic detection experimental system consisting of a needle-tip model and a surface model was built.Acoustic tests were carried out on needle-tip models with different curvature radii and surface discharge models with different lengths of conductive paste.The experimental results showed that acoustic and ultrasonic PD detection and voiceprint PD detection exhibited different sensitivities to the needle-tip discharge models,and the combination of acoustic and ultrasonic PD and voiceprint PD detection was more beneficial for the comprehensive detection of cable PD signals.Based on voiceprint recognition technology,this study drew FFT(Fast Fourier Transformation)diagrams of different types of PD acoustic signals and analyzed the differences in the ultrasonic signal frequency distribution.The frequency band of the voiceprint PD signal of the needle-tip discharge models was concentrated in the range 17-27 kHz,and the frequency band of the voiceprint PD signal of the conductive paste discharge models was concentrated in the range 20-25 kHz.The measurement of voiceprint PD signals in these frequency bands were strengthened when the PD of a cable was detected on-site,which provides the basis for the use of the cable model for on-site PD detection. | Hang Ji Xing Lei Qiang Xu Chengjun Huang Ting Ye Shangqing Yuan | 2022 | Global Energy Interconnection2022，5，1： | 1 |
| 9 | Multiple positive solutions for boundary value problem of a nonlinear fractional differential equation显示文摘 | Xu Xiaojie Jiang Daqing Yuan Chengjun | 2009 | Nonlinear Analysis2009，71，： | 1 |
| 10 | Positive solutions of a singular positone and semipositone boundary value problems for fourth-order difference equations显示文摘 | Yuan Chengjun | | 0，，： | 1 |
| 11 | Existence and uniqueness of positive solutions for fourth-order nonlinear singular continuous and discrete boundary value problems显示文摘 | Yuan Chengjun Jiang Daqing O' Regan Donal | 2008 | Applied Mathematics and Computation2008，203，： | 1 |
| 12 | Multiple positive solutions for the boundary value problem of a nonlinear fractional differential equation显示文摘 | Xiaojie Xu Daqing Jiang Chengjun Yuan | 2009 | Nonlinear Analysis2009，71，10： | 1 |
| 13 | The Impact of Climatic and Environmental Factors on n-Alkanes Indices in Southwestern Tibetan Plateau显示文摘n-Alkanes are widely used in paleoenvironmental reconstructions.However,our understanding of changes in the distribution of n-alkanes with climatic and environmental factors remains unclear in arid/semi-arid regions.We sampled 26 surface sediments from three climatic zones across the southwestern Tibetan Plateau to evaluate the sensitivity of chain length distributions of n-alkanes to climatic and environmental parameters.Our observations demonstrate that average chain length(ACL),proportion of aquatic macrophyte(Paq),carbon preference index(CPI)and ratio of the contents of nC_(27)and nC_(31)(nC_(27)/nC_(31))are all sensitive to hydroclimatic conditions.In contrast to commonly-adopted assumptions,the correlations between these indices and hydrological parameters are not always good,which indicates that the interpretation of n-alkane indices is special on the southwestern Tibetan Plateau.These might be related to the vegetation characteristics and seasonality of biological activity,and need to be considered in paleoclimatic reconstruction.The impact of seasonal precipitation on n-alkanes indices was also evaluated. | LING Yuan ZHENG Mianping WANG Shuxian SUN Qing XIE Bingjing ZHANG Chengjun | 2021 | Acta Geologica Sinica(English Edition)2021，95，2： | 1 |
| 14 | Multiple positive solutions for the boundary value problem of a nonlinear fractional differential equation 显示文摘 | XU XIAOJIE JANG DAQING YUAN CHENGJUN | 2009 | Nonlinear Analysis : Theory Methods & Applications2009，71，10： | 1 |
| 15 | Stochastically asymptotically stability of the multi-group SEIR and SIR models with random perturbation显示文摘 | Yuan Chengjun Jiang Daqing O'Regan D Agarwal R P | 2012 | Comm Nonl Sei Numer Simul2012，17，： | 1 |
| 16 | Multiple pos- itive solutions for the boundary value problem of a nonlin- ear fractional differential equation显示文摘 | Xu Xiaojie Jiang Daqing Yuan Chengjun | 2009 | Nonlinear Analys- is2009，71，： | 1 |
| 17 | The positive properties of the Green function for Dirichlet-type boundary value problems of non- linear fractional differential equation and its application 显示文摘 | Jiang Daqing Yuan Chengjun | 2010 | Nonlinear Anal2010，72，2： | 1 |
| 18 | Multiple Positive Solutions for the Boundary Value Problem of a Nonlinear Fractional Differential Equation显示文摘 | XU Xiaojie JIANG Daqing YUAN Chengjun | 2009 | Nonlinear Anal: Theory Methods & Applications2009，71，0： | 1 |
| 19 | Multiple positive solutions for the boundary value problem of a nonlinear fractional differential equation显示文摘 | XU Xiaojie JIANG Daqing YUAN Chengjun | 2009 | Nonlinear Analysis:Theory Methods&Applications2009，71，10： | 1 |
| 20 | Multiple positive solutions for the boundary value prob- lem of a nonlinear fractional differential equation显示文摘 | Xiaojie Xu Daqing Jiang Chengjun Yuan | 2009 | Nonlinear Analysis2009，71，： | 1 |
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