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| 1 | The effect of land use structure on the distribution of soil nutrients in the hilly area of the Loess Plateau,China显示文摘The irrational land use is one of the main reasons for the soil erosion and nutrient loss in the loess hilly area of China. In this project, 4 types of typical land use structure of sustain ment for about 15 years in the loess hill slope are selected to study the effect of land use structure on the distribution of soil nutrients. From hill bottom to hill top, the patterns of land use types are:, grassland-slope farmland-forest, slope farmland-grassland-forest, terrace-grassland-forest and slope farmland-forest-grassland. By measuring the contents of the total N, total P, available N, available P and organic matter of soils, the results show that the land use structure types of slope farmland-grassland-forest and terrace-grassland-forest have a better capacity to maintain the soil nutrients. | Bojie Fu Keming Ma Huafeng Zhou Liding Chen | 1999 | Chinese Science Bulletin1999，44，8： | 32 |
| 2 | Carbon and nitrogen isotopes analysis and sources of organic matter in surface sediments from the Sanggou Bay and its adjacent areas, China显示文摘Naturally existing stable carbon and nitrogen isotopes are important in the study of sedimentary organic matter sources. To identify the sources of sedimentary organic matter in Sanggou Bay and its adjacent areas, which is characterized by high-density shellfish and seaweed aquaculture, the grain size, organic carbon(OC), total nitrogen(TN), carbon and nitrogen isotopic composition(δ13C and δ15N) of organic matter in the surface sediment were determined. The results showed that, in August, sedimentary OC and TN ranged from 0.17% to 0.76% and 0.04% to 0.14%, respectively. In November, OC and TN ranged from 0.23% to 0.87% and 0.05% to 0.14%, respectively. There was a significant positive correlation between OC and TN(R=0.98, P<0.0001), indicating that OC and TN were homologous. In August, the δ13C and δ15N of organic matter varied from-23.06‰ to-21.59‰ and 5.10‰ to 6.31‰, respectively. In November, δ13C and δ15N ranged from-22.87‰ to-21.34‰ and 5.13‰ to 7.31‰, respectively. This study found that the major sources of sedimentary organic matter were marine shellfish biodeposition, seaweed farming, and soil organic matter. Using a three-end-member mixed model, we estimated that the dominant source of sedimentary organic matter was shellfish biodeposition, with an average contribution rate of 65.53% in August and 43.00% in November. Thus, shellfish farming had a significant influence on the coastal carbon cycle. | XIA Bin CUI Yi CHEN Bijuan CUI Zhengguo QU Keming MA Feifei | 2014 | Acta Oceanologica Sinica2014，33，12： | 7 |
| 3 | Joint Beamforming Optimization for Reconfigurable Intelligent Surface-Enabled MISO-OFDM Systems显示文摘In this paper,we investigate the reconfigurable intelligent surface(RIS)-enabled multiple-input-single-output orthogonal frequency division multiplexing(MISO-OFDM)system under frequency-selective channels,and propose a low-complexity alternating optimization(AO)based joint beamforming and RIS phase shifts optimization algorithm to maximize the achievable rate.First,with fixed RIS phase shifts,we devise the optimal closedform transmit beamforming vectors corresponding to different subcarriers.Then,with given active beamforming vectors,near-optimal RIS reflection coefficients can be determined efficiently leveraging fractional programming(FP)combined with manifold optimization(MO)or majorization-minimization(MM)framework.Additionally,we also propose a heuristic RIS phase shifts design approach based on the sum of subcarrier gain maximization(SSGM)criterion requiring lower complexity.Numerical results indicate that the proposed MO/MM algorithm can achieve almost the same rate as the upper bound achieved by the semidefinite relaxation(SDR)algorithm,and the proposed SSGM based scheme is only slightly inferior to the upper bound while has much lower complexity.These results demonstrate the effectiveness of the proposed algorithms. | Keming Feng Xiao Li Yu Han Yijian Chen | 2021 | China Communications2021，18，3： | 6 |
| 4 | Research on Critical Flow of Water under Supercritical Pressures in Nozzles显示文摘 | Yuzhou Chen Minfu Zhao Chunsheng Yang Keming Bi Kaiwen Du Shuming Zhang | 2012 | Journal of Energy and Power Engineering2012，6，2： | 3 |
| 5 | Facile synthesis of hierarchical Na2Fe(SO4)2@rGO/C as high-voltage cathode for energy density-enhanced sodium-ion batteries显示文摘Fe-based sulfates are ideal cathode candidates for sodium-ion batteries(SIBs) owing to their high operating voltage and low cost but suffer from the nature of poor power performance. Herein, a hierarchical porous Na2Fe(SO4)2@reduced graphene oxide/carbon dot(Na2Fe(SO4)2@rGO/C) with low carbon content(4.12 wt%) was synthesized via a facile homogeneous strategy benefiting for engineering application,which delivers excellent sodium storage performance(high voltage plateau of 3.75 V, 85 m Ah g-1 and330 Wh kg-1 at 0.05 C;5805 W kg-1 at 10 C) and high Na+diffusion coefficient(1.19 × 10-12 cm2 s-1).Moreover, the midpoint voltage of assembled full cell could reach 3.0 V. The electron transfer and reaction kinetics are effectively boosted since the nanoscale Na2Fe(SO4)2 is supported by a robust crosslinked carbon matrix with rGO sheets and carbon dots. The slight rGO sheets sufficiently enhance the electron transfer like a current collecter and restrain the aggregation, as well as ensure smooth ion channels. Meanwhile, the carbon dots in the whole space connect with Na2Fe(SO4)2 and help rGO to promote the conductivity of the electrode. Ex-situ X-ray powder diffraction and X-ray photoelectron spectrometry analysis confirm the high reversibility of this sodiation/desodiation process. | Ge Yao Xixue Zhang Yongliang Yan Jiyu Zhang Keming Song Juan Shi Liwei Mi Jinyun Zheng Xiangming Feng Weihua Chen | 2020 | Journal of Energy Chemistry2020，29，11： | 3 |
| 6 | The geometric simulation and analysis of the blind growth fold in the overthrust belt of the southern section of the frontier Longmen Mt.during Late Triassic显示文摘The seismic profiles processed by high-resolution display that a blind growth fault-bend fold emerges in depth of seismic exploration area in Dayi in the southern section of the frontier Longmen Mt.This paper presents a detailed structural interpretation to seismic section,then describes the deformed geometry related to the pre-growth strata,the growth strata and the post-growth strata on both limbs of the fold.The computer geometric simulation,based on the model of fault-bend fold,is utilized to stimulate the geometry of the blind growth fold at different sedimentation rates in Dayi.These structural features are subsequently extracted and compared with the actual seismic reflection section.Our research suggests that a low angle overthrust formed during Late Triassic also appears in the southern section of the frontier Longmen Mt.The event of structure took place at the depositional stage of a portion of the middle and upper fourth member of Xujiahe Formation(T3x4),which corresponds to thrusting in the northern section of the frontier Longmen Mt.However,the thrusting displacement here is smaller than one of the northern section. | CHEN Wei YANG KeMing LI ShuBin JIAN GaoMing TANG Jin ZHAO Yiao SU Qian | 2009 | Chinese Science Bulletin2009，54，8： | 3 |
| 7 | Adenosine triphosphate promotes locomotor recovery after spinal cord injury by activating mammalian target of rapamycin pathway in rats显示文摘The mammalian target of rapamycin (mTOR) pathway plays an important role in neuronal growth, proliferation and differentiation. To better understand the role of mTOR pathway involved in the induction of spinal cord injury, rat models of spinal cord injury were established by modified Allen's stall method and interfered for 7 days by intraperitoneal administration of mTOR activator adenosin triphosphate and mTOR kinase inhibitor rapamycin. At 1-4 weeks after spinal cord injury induction, the Basso, Beattie and Bresnahan locomotor rating scale was used to evaluate rat locomotor function, and immunohistochemical staining and western blot analysis were used to detect the expression of nestin (neural stem cell marker), neuronal nuclei (neuronal marker), neuron specific enolase, neurofilament protein 200 (axonal marker), glial fibrillary acidic protein (astrocyte marker), Akt, mTOR and signal transduction and activator of transcription 3 (STAT3). Results showed that adenosine triphosphate-mediated Akt/mTOR/STAT3 pathway increased endogenous neural stem cells, induced neurogenesis and axonal growth, inhibited excessive astrogliosis and improved the locomotor function of rats with spinal cord injury. | Zhengang Sun Lingyun Hu Yimin Wen Keming Chen Zhenjuan Sun Haiyuan Yue Chao Zhang | 2013 | Neural Regeneration Research2013，8，2： | 3 |
| 8 | Functions and action mechanisms of flavonoids genistein and icariin in regulating bone remodeling显示文摘 | Ming Leiguo Chen Keming Xian C J | 2013 | J Cell Physiol2013，228，3： | 1 |
| 9 | A novel strategy for mining frequent closed itemsets in data streams 显示文摘 | Tang Keming Dai Caiyan Chen Ling | 2012 | Journal of Computers2012，7，7： | 1 |
| 10 | The rela- tionship between land use and soil conditions in the hilly area of Loess Plateau in Northern Shaanxi, China显示文摘 | Fu Bojie Chen Liding Ma Keming | 2000 | Catena2000，39，1： | 1 |
| 11 | The relationships between land use and soil conditions in the hilly area of the loess plateau in northern Shaanxi, China显示文摘 | Bojie Fu Liding Chen Keming Ma Huafeng Zhou Jun Wang | 2000 | Catena2000，，1： | 1 |
| 12 | Dynamic Modeling and Adaptive Fast Nonsingular Terminal Sliding Mode Control for Satellite with Double Rotary Payloads显示文摘A robust attitude control methodology is proposed for satellite system with double rotary payloads.The dynamic model is built by the Newton-Euler method and then the dynamic interconnection between satellite′s main body and payloads is described precisely.A nonlinear disturbance observer is designed for satellite′s main body to estimate disturbance torque acted by motion of payloads.Meanwhile,the adaptive fast nonsingular terminal sliding-mode attitude stabilization controller is proposed for satellite′s main body to quicken convergence speed of state variables.Similarly,the adaptive fast nonsingular terminal sliding-mode attitude maneuver controller is designed for each payload to weaken the disturbance effect of motion of satellite′s main body.Simulation results verify the effectiveness of the proposed method. | Xu Chen Lu Yuping Yao Keming Liu Yanbin Xiao Dibo | 2016 | Transactions of Nanjing University of Aeronautics and Astronautics2016，33，3： | 1 |
| 13 | Sinusoidal electromagnetic field stimulates rat osteoblast dif- ferentiation and maturation via activation of NO-cGMP-PKGpathway 显示文摘 | CHENG Guozheng ZHAI Yuankun CHEN Keming | 2011 | Nitric Oxide2011，25，3： | 1 |
| 14 | Path- ological and physiological identification of race C of Bipo- laris rnaydis in China 显示文摘 | WEI Jiankun LIU Keming CHEN Junpeng | 1988 | Phytopathology1988，78，5： | 1 |
| 15 | Frequency stabilized tunable diode laser and strong transition iodine hyperine spectra at 633 nm显示文摘 | Chen Xuzong Zhang Keming | 1998 | SPIE1998，3547，： | 1 |
| 16 | New technology for the detection of pH显示文摘 | Miao Yuqing Chen Jianrong Fang Keming | 2005 | Journal of Biochemical and Biophysical Methods2005，，1： | 1 |
| 17 | Critical Heat Flux with Subcooled Flowing Water in Tubes for Pressures from Atmosphere to Near-Critical Point显示文摘 | Yuzhou Chen Keming Bi Minfu Zhao Chunsheng Yang Kaiwen Du | 2016 | Journal of Energy and Power Engineering2016，10，4： | 1 |
| 18 | The Relationships Between Land-use and Soil Conditions in the Hilly Area of the Loess Plateau in Northern Shaanxi, China 显示文摘 | Fu hoie Chen Liding Ma Keming | 2000 | Catena2000，395，： | 1 |
| 19 | Creation of macroporous calcium phosphate cements as bone substitutes by using genipin-crosslinked gelatin microspheres显示文摘 | Meng Li Xingyan Liu Xudong Liu Baofeng Ge Keming Chen | 2009 | Journal of Materials Science: Materials in Medicine2009，，4： | 1 |
| 20 | The relationships between land-use and soil conditions in the hilly area of the Loess Plateau in northern shananxi China 显示文摘 | Fu Bojie Chen Liding Ma Keming | 2000 | Catena2000，39，： | 1 |
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