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| 1 | Revised Chronostratigraphic Framework of the Metamorphic Strata in the Jiangnan Orogenic Belt,South China and its Tectonic Implications显示文摘In a re-study of regional geology by the China Geological Survey(CGS),the key problem is in the stratigraphical division and correlation.According to the new isotopic dating of the Meso-and Neoproterozoic in China,there have been great changes in the strata correlation and tectonic explanation.The authors obtained four zircon sensitive high resolution ion micro-probe(SHRIMP) U-Pb datings from the bentonite of the Lengjiaxi Group(822±10 Ma,823±12 Ma and 834±11 Ma) and Banxi Group(802.6±7.6 Ma) in north Hunan Province,which is considered to be the middle part of the Jiangnan Orogenic Belt.On the basis of the zircon dating mentioned above,the end of the Wuling orogen is first limited in the period from 822 Ma to 802 Ma in one continued outcrop(Lucheng section) in Linxiang city,Hunan Province.Combining a series of new zircon U-Pb datings in the Yangtze and Cathaysia blocks,several Neoproterozoic volcanic events and distribution of the metamorphic rocks in the Jiangnan Orogenic Belt have been distinguished.In the context of the global geodynamics,it is useful to set up a practical and high precision chronological framework and basic and unified late Precambrian section in South China. | GAO Linzhi DING Xiaozhong ZHANG Chuanheng CHENJun LIU Yaorong ZHANG Hang LIU Xanxue PANG Weihua | 2012 | Acta Geologica Sinica(English Edition)2012，86，2： | 14 |
| 2 | A significant carbon sink in temperate forests in Beijing: based on 20-year field measurements in three stands显示文摘Numerous efforts have been made to characterize forest carbon(C) cycles and stocks in various ecosystems. However, long-term observation on each component of the forest C cycle is still lacking. We measured C stocks and fluxes in three permanent temperate forest plots(birch, oak and pine forest) during 2011–2014, and calculated the changes of the components of the C cycle related to the measurements during 1992–1994 at Mt. Dongling, Beijing, China. Forest net primary production in birch, oak, and pine plots was 5.32, 4.53, and 6.73 Mg C ha?1 a?1, respectively. Corresponding net ecosystem production was 0.12, 0.43, and 3.53 Mg C ha?1 a?1. The C stocks and fluxes in 2011–2014 were significantly larger than those in 1992–1994 in which the biomass C densities in birch, oak, and pine plots increased from 50.0, 37.7, and 54.0 Mg C ha–1 in 1994 to 101.5, 77.3, and 110.9 Mg C ha?1 in 2014; soil organic C densities increased from 207.0, 239.1, and 231.7 Mg C ha?1 to 214.8, 241.7, and 238.4 Mg C ha?1; and soil heterotrophic respiration increased from 2.78, 3.49, and 1.81 Mg C ha?1 a?1 to 5.20, 4.10, and 3.20 Mg C ha?1 a?1. These results suggest that the mountainous temperate forest ecosystems in Beijing have served as a carbon sink in the last two decades. These observations of C stocks and fluxes provided field-based data for a long-term study of C cycling in temperate forest ecosystems. | ZHU JianXiao HU XueYang YAO Hui LIU GuoHua JI ChenJun FANG JingYun | 2015 | Science China(Life Sciences)2015，58，11： | 6 |
| 3 | Biological removal of antiandrogenic activity in gray wastewater and coking wastewater by membrane reactor process显示文摘A recombinant human androgen receptor yeast assay was applied to investigate the occurrence of antiandrogens as well as the mechanism for their removal during gray wastewater and coking wastewater treatment. The membrane reactor(MBR) system for gray wastewater treatment could remove 88.0% of antiandrogenic activity exerted by weakly polar extracts and 97.3% of that by moderately strong polar extracts, but only 32.5%of that contributed by strong polar extracts. Biodegradation by microorganisms in the MBR contributed to 95.9% of the total removal. After the treatment, the concentration of antiandrogenic activity in the effluent was still 1.05 μg flutamide equivalence(FEQ)/L, 36.2%of which was due to strong polar extracts. In the anaerobic reactor, anoxic reactor, and membrane reactor system for coking wastewater treatment, the antiandrogenic activity of raw coking wastewater was 78.6 mg FEQ/L, and the effluent of the treatment system had only 0.34 mg FEQ/L. The antiandrogenic activity mainly existed in the medium strong polar and strong polar extracts. Biodegradation by microorganisms contributed to at least 89.2%of the total antiandrogenic activity removal in the system. Biodegradation was the main removal mechanism of antiandrogenic activity in both the wastewater treatment systems. | Dehua Ma Lujun Chen Cong Liu Chenjun Bao Rui Liu | 2015 | Journal of Environmental Sciences2015，27，7： | 5 |
| 4 | New Insights into the Depositional Environments of Ordovician Carbonate Formations in the Yubei Area of Tarim Basin Based on Standard Microfacies Types显示文摘Objective The Yubei area is located in the mid-east Maigaiti slope of southwestern Tarim Basin,China,with an exploration history of several years.Recent exploration has preliminarily indicated that the Ordovician carbonate formations in this area have some oil and gas potential.Carbonate microfacies provides material basis for reservoir development,seal formation and | HUANG Chenjun LIU Geyun MA Yongsheng LIU Bo LIU Hongguang SHI Kaibo | 2017 | Acta Geologica Sinica(English Edition)2017，91，2： | 5 |
| 5 | Magma Mixing and Mingling for Xiangjiananshan Granitic batholith at eastern area of the East Kunlun Orogenic Belt显示文摘The East Kunlun Orogenic Belt(EKOB)in northeast margin of the Qinghai-Tibetan Plateau is an important part of the Central Orogenic System(COS).During the long-time geological evolution,complicated | CHEN Guochao PEI Xianzhi LI Ruibao LI Zuochen LIU Chenjun CHEN Youxin PEI Lei | 2017 | Acta Geologica Sinica(English Edition)2017，91，S1： | 5 |
| 6 | Hydrocarbon migration in fracture-cave systems of carbonate reservoirs under tectonic stresses:A modeling study显示文摘The Tahe oilfield,located in the southwest of the Akekule nosing structure,northern Tarim basin,was the most prolific oilfield targeting at the Ordovician carbonate reservoirs in China.The reservoir space was dominant with fracture-cave systems commonly induced by tectonics and karstification.Although hydrocarbon production had proceeded for two decades in the Tahe oilfiled,the control of oil and gas accumulations was still doubtful.In this work,the periodic fluid flow induced by cyclic tectonic stresses was proposed as the mechanism of hydrocarbon migration in the fracture-cave systems of carbonate reservoirs.The fracture networks formed conduits for fluid flow,and the fluid pressure in caves transmitted from stress field provided the driving force.The constitutive equations were established among stresses,fracture densities and flow velocities.Four quasi-3D geological models were constructed to simulate the flow velocities on the Ordovician surface of Akekule nosing structure in the critical tectonic stages.The simulated results supplied indicative information on oil and gas migration and accumulation in the tectonic stages.Combining with the oil and gas charge history,a conceptual model was built to reveal the multi-stage oil and gas charge and accumulation in the Ordovician of Akekule nosing structure. | Chenjun Huang Geyun Liu Yongsheng Ma Xingui Zhou Linyan Zhang Jinyin Yin Jinrui Guo | 2019 | Petroleum Research2019，4，4： | 2 |
| 7 | A Bayesian Discriminating Features Method for Face Detection显示文摘 | Liu Chenjun | 2003 | IEEE Transactions on Pattern Analysis and Machine Intelligence2003，25，6： | 1 |
| 8 | Hydrocarbon migration in fracture-cave systems of carbonate reservoirs under tectonic stresses: A mechanism study显示文摘The fracture-cave systems of carbonate reservoirs have almost stored 30% of recoverable oil and gasaround the world. However, it is still doubtful about the mechanism of hydrocarbon migration in thefracture-cave systems. In this work, deducing from the Eshelby’ solution, we derived the equation tocalculate the bulk strain of elliptic cylinder caves applied by stresses. Calculated results indicate that thebulk strain of caves negatively increases with the radius ratio of the elliptic cave axials under fixedstresses. In the case of the effective horizontal stress increasing from 30 MPa to 80 MPa, the bulk straindifference of a cave could be up to 0.5%. It may result in 0.4% of the total cave volume of fluid transportingthrough the fracture-cave systems within such a stress cycle. Since the tectonic stresses transform in acyclic way, the volumetric ratio of new-to-old fluid in a cave would increase with the number of stresscycles. As a result, we proposed that the periodic fluid flow induced by cyclic tectonic stresses could be animportant mechanism for hydrocarbon migration in the fracture-cave systems of carbonate reservoirs. | Chenjun Huang Geyun Liu Kaibo Shi Jinyin Yin Jinrui Guo Chongzhi Tao | 2020 | Petroleum Research2020，5，2： | 1 |
| 9 | Carboxyl-functionalized Nanocellulose Reinforced Nanocomposite Proton Exchange Membrane显示文摘Nanocellulose(NCC) was prepared through the acid hydrolysis of microcellulose(MCC) and was reacted with maleic anliydride to obtain carboxyl-functionized nanocellulose(MA-NCCs). The presence of .OH and .SO3H on the surface of rod-like MA-NCC was confirmed by Fourier transfonn infrared spectrometry(FTIR). Sulfonated poly(aryl ether ether ketone ketone)(Ph-SPEEKK) was synthesized with bis(4-fluorophenyl-methanone) and 2-phenylhydroquinone as monomer. MA-NCC/Ph-SPEEKK nanocomposite membranes with different MA-NCCs content were prepared, and their properties were characterized. Compared with Ph-SPEEKK, MA-NCC/Ph-SPEEKK nanocomposite membrane showed better mechanical and thermal properties and higher proton conductivity. The proton conductivity of the composite membrane with 4%(mass fraction) MA-NCCs under 80℃ was 0.095 S/cm. And its tensile strength reached 30.3 MPa, which was 21.2% higher than that of Ph-SPEEKK pure polymer membrane. | YANG Xue WEI Yingcong CHU Xuefeng ZHAO Qi YAN Wenling DONG Chenjun LIU Baijun SUN Zhaoyan HU Wei ZHANG Niaona | 2019 | Chemical Research in Chinese Universities2019，35，4： | 0 |
| 10 | Wireless Communication Signal Strength Prediction Method Based on the K-nearest Neighbor Algorithm显示文摘Existing interference protection systems lack automatic evaluation methods to provide scientific, objective and accurate assessment results. To address this issue, this paper develops a layout scheme by geometrically modeling the actual scene, so that the hand-held full-band spectrum analyzer would be able to collect signal field strength values for indoor complex scenes. An improved prediction algorithm based on the K-nearest neighbor non-parametric kernel regression was proposed to predict the signal field strengths for the whole plane before and after being shield. Then the highest accuracy set of data could be picked out by comparison. The experimental results show that the improved prediction algorithm based on the K-nearest neighbor non-parametric kernel regression can scientifically and objectively predict the indoor complex scenes’ signal strength and evaluate the interference protection with high accuracy. | Zhao Chen Ning Xiong Yujue Wang Yong Ding Hengkui Xiang Chenjun Tang Lingang Liu Xiuqing Zou Decun Luo | 2019 | 国际计算机前沿大会会议论文集2019，，1： | 0 |
| 11 | Amino acids industry knowledge service platform显示文摘Purpose: This paper introduces an amino acids industry knowledge service platform, which integrates industry data, science literature, and technology knowledge from patents.Design/methodology/approach: From the perspective of knowledge organization, the amino acids industry knowledge service platform comprises a basic data layer, a knowledge representation layer, and a knowledge service layer. The platform integrates heterogeneous information sources by means of a multi-dimensional integration index. It enables users to find technology knowledge from patents by employing the semantic Theory of Inventive Problem Solving(TRIZ).Findings: This paper constructs an integrated amino acids industry database, which offers a general service oriented to the public, and a technical innovation knowledge base, which offers a value-added service oriented to enterprises.Research limitations: The technical innovation knowledge base only includes parts of amino acids technology knowledge, making it suitable to meet certain specific needs. Practical implications: Semantic annotation of technical innovation knowledge from patents requires manual work by domain experts.Originality/value: The amino acids industry knowledge service platform offers not only an integrated search service for amino acids industry information, but also a deep tech mining service for technical innovation knowledge of amino acids. It will offer a more personalized knowledge service in the future. | Yi WEN Hongguang FU Shu FANG Qinggang LI Zhengyin HU Chunjiang LIU Ning YANG Xian ZHANG Yuan XU Chenjun Ding Yuexian ZHU | 2015 | Chinese Journal of Library and Information Science2015，，4： | 0 |
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