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| 1 | Target localization and parameters estimation by sonar system with explosions as underwater sound sources显示文摘Underwater target localization and parameters(azimuth and range) estimation by the method of utilizing explosions as underwater sound sources are described in this paper.The narrow beam reverberation model of the target echo signal is researched to estimate the target azimuth in reverberation background.Estimation errors of target azimuth and range are studied and proved to approximately meet Gauss distribution.Then the variance formula of target range error is deduced.Simulation experiments are applied to research the target range error and its standard deviation,and a series of measures to improve the estimation accuracy of target range are proposed.It is confirmed by the data processing results of simulations and lake experiments that the proposed method can accurately locate underwater target at a long distance on the condition of a certain underwater explosion range error. | YAN Sheng WEI Xiaojun HAO Chengpeng MA Hui YAN Shefeng | 2016 | Chinese Journal of Acoustics2016，35，4： | 4 |
| 2 | Octacyclic and decacyclic ent‑abietane dimers with cytotoxic activity from Euphorbia fischeriana steud.显示文摘A novel Diels-Alder adduct possesses a 6/6/6/5/6/6/6/6 octacyclic skeleton featured with bicyclo[2.2.2]octane moiety,biseupyiheoid A(1),along with another decacyclic 6/6/6/3/5/6/5/6/6/6 fused diterpenoid dimer,bisfischoid C(2),were isolated from Euphorbia fischeriana.Their structures were determined by spectroscopic,X-ray crystallographic approaches,and quantum mechanical calculations.The structural features of 1 and 2 were hypothesized to involve intramolecular Diels-Alder reactions with different coupling patterns.Dimer 1 showed antiproliferative activity through apoptosis activation in LoVo cells. | Yulin Peng Yibo Chang Chengpeng Sun Weiyi Wang Chao Wang Yan Tian Baojing Zhang Sa Deng Wenyu Zhao Xiaochi Ma | 2022 | Chinese Chemical Letters2022，33，9： | 1 |
| 3 | Geochemistry and origin of deep-seated cracked gas on the northern slope of the Dongying Sag, Shandong Province显示文摘Deep-seated cracked gas exploration was achieved great breakthrough in Es4L of the Minfeng area on the northern slope of the Dongying Sag. Carbon isotopic and molecular compositions studies revealed the characteristics of wet gas and a normal trend of carbon isotopic composition. Empirical cutoff points of δ13C2 and δ13C3 and light hydrocarbon compositions distinguished the cracking gas as sapropelic gas. Variations in i/nC5, i/nC4 and δ13C2 fur-ther confirmed that the gas was cracked from residual kerogen. Source characteristics indicated that the gas was de-rived from mature-highly mature source rocks of Es4 with kerogen type II being dominant mixed with some oil-cracking gas. Burial history modeling indicated that there were two hydrocarbon charging periods in Es4L reser-voirs. The first period refers to the Guantao-Minghuazhen stage dominated by oil charging, while the second period refers to the Minghuazhen stage and has been dominated by cracked gas charging till now. | CHANG Xiangchun HAN Zuozhen XU Youde SHANG Xiaofei YAN Chengpeng | 2011 | Chinese Journal Of Geochemistry2011，30，3： | 1 |
| 4 | Unsymmetrical photochromic bithienylethene-bridge tetraphenylethene molecular switches:Synthesis,aggregation-induced emission and information storage显示文摘Aggregation-induced emission(AIE) active photochromic molecules have attracted growing attention for their versatile applications.Here we designed and synthesized five newly unsymmetrical photochromic diarylethene(DAE) dyads(BTE1-5) by connecting tetraphenylethene(TPE) and aromatic substituent via bithienylethene(BTE) bridge.The chemical structures of those compounds were identified by ^1H NMR,^(13)C NMR and HRMS.The absorption and emission of these dyads were investigated by UV-vis and fluore scence spectroscopy,respectively.The results showed that all those compounds exhibited typically AIE or aggregation-induced emission enhancement(AIEE) characteristic.Particularly,when an aggregationcaused quenching(ACQ) fluorophore(triphenylamine) was grafted to the molecule,connecting with TPE via BTE-bridge,the ACQ phenomenon was dissipated and converted to an AIE luminophore,and those compounds exhibited photochromism upon irradiation with alternative UV and visible light.The solution or solid of those compounds showed distinctly fluorescence switching 'ON' or 'OFF' observation upon irradiation with alternative UV and visible light.It is interesting that BTE1 could be applied in recording and rewritable information storage,and the cyclization quantum yields could be affected by substituent significantly. | Liangwei Ma Chengpeng Li Qing Yan Sheng Wang Wangen Miao Derong Cao | 2020 | Chinese Chemical Letters2020，31，2： | 1 |
| 5 | Geochemical characteristics of aromatic hydrocarbons in crude oils from the Linnan Subsag, Shandong Province, China显示文摘Abundant aromatic fractions were detected in oils from the Linnan subsag, including aphthalenes, phenanthrenes, triaromatic steroids, biphenyl, fluorenes, dibenzothiophenes, dibenzofuranes, as well as some typical higher plant-sourced compounds, such as pyrene, benzopyrene, fluoranthene, chryaene, benzofluoranthrene, perylene and cadalene. Occurrences of biomarkers indicate that oils from the Linnan subsag are typical terrestrially genetic oils. Developed in the depositional environment is a strong reduction condition typical of brackish-saline lake. Thermal evolution has entered into the mature-high mature stage. | CHANG Xiangchun HAN Zuozhen SHANG Xiaofei YAN Chengpeng | 2011 | Chinese Journal Of Geochemistry2011，30，1： | 1 |
| 6 | Ultra-high strength yet superplasticity in a hetero-grain-sized nanocrystalline Au nanowire显示文摘Nanocrystalline metals often display a high strength up to the gigapascal level,yet they suffer from poor plasticity.Previous studies have shown that the development of hetero-sized grains can efficiently overcome the strength-ductility trade-off of nanocrystalline metals.However,whether this strategy can lead to the fabrication of nanocrystalline nanowires exhibiting both high strength and superplasticity is unclear,similar to the atomistic deformation mechanism.In this paper,we show that ultra-small nanocrystalline Au nanowires comprising grains in both the Hall–Petch and inverse Hall–Petch grain-size regions can exhibit extremely high uniform elongation(236%)and high strength(2.34 gigapascals)at room temperature.In situ atomic-scale observations revealed that the plastic deformation underwent two stages.In the first stage,the super-elongation ability originated from the intergrain plasticity of small grains via mechanisms such as grain boundary migration and grain rotation.This intergrain plasticity caused the grains in the heterogeneous-structured nanowires to grow very large.In the second stage,the superelongation ability originated from intragrain plasticity accompanied by the diffusion of surface atoms.Our results show that the hetero-grain-sized nanocrystalline nanowires,comprising grains with sizes both in the strongest Hall–Petch effect region and the inverse Hall–Petch effect region,were simultaneously ultrastrong and ductile.They displayed neither a strength-ductility trade-off nor plastic instability. | Libo Fu Deli Kong Chengpeng Yang Jiao Teng Yan Lu Yizhong Guo Guo Yang Xin Yan Pan Liu Mingwei Chen Ze Zhang Lihua Wang Xiaodong Han | 2022 | Journal of Materials Science & Technology2022，，6： | 1 |
| 7 | Development of Integrated Computational Materials Engineering(ICME)Model for Mg Alloy Design and Process Optimization显示文摘Integrated computational materials engineering(ICME)has emerged to be one of the most powerful materials genome engineering(MGE)approaches in designing new materials and manufacturing processes in recent years.It has successfully deployed many new products for the electronic,automotive,and aerospace industries.This paper reviews the current status of research on first principles in the design of high-strength Mg alloys,discusses the application of crystal plasticity finite element models to the microscale slip,twinning,microstructure morphology,texture evolution,and macroscopic forming of Mg alloys,and introduces the research progress of crystal plasticity finite element models and phase field models,meta cellular automata models and first principles coupled models respectively,around the need for multi-scale coupled simulations of Mg alloys.The key technology obstacles of integrating the first principles,crystal plasticity finite element,and microstructure models for Mg alloys have been solved.This paper can provide a reference for the design of new Mg alloy compositions and the development of high-performance Mg alloys. | Hui Su Zhifei Yan Yingchun Tian Chengpeng Xue Shuo Wang Guangyuan Tian Xinghai Yang Quan Li Xuelong Wu Zhongyao Li Junsheng Wang | 2023 | Journal of Beijing Institute of Technology2023，32，4： | 0 |
| 8 | Wideband reverberation suppression in beams domain based on angular distribution index显示文摘Based on the properties of wideband source's spatial spread,an algorithm for reverberation suppression in beams domain is proposed.In an effective observation range,a compact bank of receiving spatial beams is operated to transform the data from element domain to beam domain.Angular Distribution Index(ADI) is obtained by comparing to a reference value which is computed by Monte Carlo Integration.ADI decreases with a stronger target echo.Hence,choosing an appropriate threshold of ADI,the target echo can be separated from reverberation by cutting off the high AD components.The filter is compatible with the procedures of beamforming and detection for the current sonar.The computation complexity of the filter is low.The relationships between ADI and frequency,bandwidth,signal-reverberation ratio,are illustrated by a simulation example.The processing results based on the lake-trial and sea-trial data show that reverberation can be significantly suppressed,and threshold choosing for wideband ADI filter is fault tolerant. | LI Xuan MA Xiaochuan HAO Chengpeng YAN Shefeng | 2016 | Chinese Journal of Acoustics2016，35，4： | 0 |
| 9 | Robust guidance method with terminal impact angle constraint for autonomous underwater vehicle显示文摘Based on robust control design method,a variable structure guidance method is proposed for autonomous underwater vehicle(AUV) during the guiding course with terminal impact angle constraint.Considering the intercept geometry,a sliding mode controller is proposed for controlling the hne of sight angle rate and the impact angle,based on the principle which controls the line of sight angle rate to approach zero and the terminal angle to approach the expected value more quickly as the distance decreases.Simulation results show that,with the application of the proposed method,small miss distance is achieved and the expected impact angle is reached.In addition,the system is robust to the target maneuvering. | SI Changlong MA Hui HAO Chengpeng YAN Shefeng | 2016 | Chinese Journal of Acoustics2016，35，4： | 0 |
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