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75篇 您的检索式:作者名="Yansheng Li"
    题名 作者 年代 出处 被引量
1Influencing factors of seismic signals generated by un-tuned large volume airgun array in a land reservoir显示文摘Un-tuned large volume airgun array in a water reservoir is recently proposed as a new way to generate seismic waves on land. It can be used to explore the earth velocity structure and its temporal variations as well.However, the characteristics of seismic signals(especially far-field signals) from an airgun array in a reservoir and its affecting factors(firing pressure, airgun towing depth,water level of the reservoir, etc.) has not been adequately studied. We analyzed the seismic data collected from field experiments at Binchuan Transmitting Seismic Station in2011 and 2013 and found that(1) The similarity of seismic signals decrease with distance, which is most likely induced by the decay of signal amplitude and signal to noise ratio(SNR);(2) The amplitudes of far-field airgun signals are almost linearly proportional to the firing pressure;(3) The towing depth of airgun has less effects on the far-field signals;(4) The amplitudes of far-field airgun signals are proportional to the water level of the reservoir.Meng Chen Wei Yang Weitao Wang Baoshan Wang Hongkui Ge Li Chen Yansheng Ding Jiyan Qiao Yong Chen 2014Earthquake Science2014,27,4:19
2Temporal variation of soil carbon stock and its controlling factors over the last two decades on the southern Song-nen Plain,Heilongjiang Province显示文摘对全球气候变化的当前的背景,在土壤碳水池和它的控制因素的变化的学习可以在温室气体的缓解或改进帮助土壤角色的评估。这份报纸在 Heilongjiang 省在南部的 Song-nen 平原在土壤碳水池和他们的控制因素学习空间、时间的变化,用在二个不同时期由上收集的土壤数据在 20052007 的多种用途的地区性的 Geochemical 调查,和另外一个玷污在 19821990 进行的调查。学习区域是 1479 t/km2 并且在过去的 20 年里的碳来源,从直到 2005 的 1980 年代,从土壤的实际的碳排放是 0.12 Gt。温度,被发现了线性地被相关玷污器官的碳,是控制器官的碳满足的土壤的主导的 climatologic 因素。我们的学习在器官的碳由升起的温度引起了的土壤的潜在的损失是的相关区域和时间时期显示出那 0.10 Gt ,源于陆地使用变化的潜在的土壤碳排放是 0.09 Gt ,并且温暖和陆地使用变化引起的土壤碳( 0.19 Gt )的联合潜在的损失比得上石块燃料燃烧( 0.21 Gt )的。由于在土壤碳水池变化的时间延期,仍然在温暖和以后将逐渐地被释放的陆地使用变化引起的潜在的排放有 0.07 Gt。Xueqi Xia Zhongfang Yang Yan Liao Yujun Cui Yansheng Li 2010Geoscience Frontiers2010,1,1:19
3Inactivation of SACE_3446, a TetR family transcriptional regulator, stimulates erythromycin production in Saccharopolyspora erythraea显示文摘Erythromycin A is a widely used antibiotic produced by Saccharopolyspora erythraea;however,its biosynthetic cluster lacks a regulatory gene,limiting the yield enhancement via regulation engineering of S.erythraea.Herein,six TetR family transcriptional regulators(TFRs)belonging to three genomic context types were individually inactivated in S.erythraea A226,and one of them,SACE_3446,was proved to play a negative role in regulating erythromycin biosynthesis.EMSA and qRT-PCR analysis revealed that SACE_3446 covering intact N-terminal DNA binding domain specifically bound to the promoter regions of erythromycin biosynthetic gene eryAI,the resistant gene ermE and the adjacent gene SACE_3447(encoding a longchain fatty-acid CoA ligase),and repressed their transcription.Furthermore,we explored the interaction relationships of SACE_3446 and previously identified TFRs(SACE_3986 and SACE_7301)associated with erythromycin production.Given demonstrated relatively independent regulation mode of SACE_3446 and SACE_3986 in erythromycin biosynthesis,we individually and concomitantly inactivated them in an industrial S.erythraea WB.Compared with WB,the WBΔ3446 and WBΔ3446Δ3986 mutants respectively displayed 36%and 65%yield enhancement of erythromycin A,following significantly elevated transcription of eryAI and ermE.When cultured in a 5 L fermentor,erythromycin A ofWBΔ3446 and WBΔ3446Δ3986 successively reached 4095 mg/L and 4670 mg/L with 23%and 41%production improvement relative to WB.The strategy reported here will be useful to improve antibiotics production in other industrial actinomycete.Hang Wu Yansheng Wang Li Yuan Yongrong Mao Weiwei Wang Lin Zhu Panpan Wu Chengzhang Fu Rolf Muller David T.Weaver Lixin Zhang Buchang Zhang 2016Synthetic and Systems Biotechnology2016,1,1:7
4Isolation of candidate R disease resistance genes from rice显示文摘Using a polymerase chain reaction (PCR) based method six distinct candidate disease resistant gene (R) homologs from rice have been isolated. The rice sequences are organized into two phylogenetic groups with contrasting genomic organization patterns. The first group, represented by a single sequence, Osh359-1, is more similar to non-rice R sequences than to rice ones and has a simple genomic organization. The second group, represented by Osh359-3, contains the remaining five rice sequences. Osh359-3 consists of a multi-gene family. The members of Osh359-3 family are further found to be clustered together in the genome.Yongbiao Xue Dingzhong Tang Yansheng Zhang Weiming Li 1998Chinese Science Bulletin1998,43,6:6
5Efficacy and safety of rasagiline in Chinese patients with early Parkinson’s disease:a randomized, double-blind,parallel,placebo-controlled,fixed-dose study显示文摘Background:Rasagiline is a monoamine oxidase-B inhibitor used for Parkinson’s disease(PD)treatment,but its effectiveness on Chinese patients is unclear.This study aimed to evaluate the efficacy and safety of rasagiline monotherapy in Chinese patients with early PD.Methods:A 26-weeks,randomized,double-blind,placebo-controlled study has been performed at 15 sites in China and enrolled outpatients(≥35 years old)with idiopathic PD without a history of using any dopaminergic drugs.Participants were randomized 1:1 to receive rasagiline 1 mg once daily or placebo.The primary endpoint was the change of the Unified Parkinson’s Disease Rating Scale(UPDRS)total score from baseline to 26 weeks treatment.Secondary endpoints included changes in UPDRS subscale scores from part Ⅰ to Ⅲ.Health status was assessed with the PD Questionnaire(PDQ)-39 and EuroQol-Five-Dimension(EQ-5D)questionnaire.Safety profile was collected until 30 weeks after randomization.Results:A total of 130 patients(n=65/group)were recruited,and 127(rasagiline,n=64;placebo,n=63)were included in the full analysis set.Baseline characteristics were comparable between the two groups.The decrease in the mean UPDRS total score was greater in the rasagiline group than in the placebo group(−3.18±0.95 vs.−0.18±0.98,P=0.025),and the mean UPDRS part I non-motor symptoms score(−0.54±0.15 vs.-0.08±0.15,P=0.003)were significantly decreased in the rasagiline group compared with placebo treated patients.An improvement trend was observed in the active treatment group for the subscales evaluation with parts Ⅱ and Ⅲ,while the difference to placebo was not statistically significant.Life quality assessed by the EQ-5D visual analog scale improved in the rasagiline group but worsened in placebo treated patients.The overall incidence of treatment-emergent adverse events(AEs)was slightly lower in the rasagiline group(41.5%)than in the placebo group(46.2%).Conclusions:Rasagiline is effective,safe,and well tolerated as monotherapy for the treatment of Chinese PD patients.Zhenxin Zhang Jian Wang Shengdi Chen Chunfeng Liu Baorong Zhang Rong Peng Shenggang Sun Xiangru Sun Gang Zhao Qiumin Qu Yansheng Li Suiqiang Zhu Xiaoping Pan Ming Shao Yanping Wang 2018Translational Neurodegeneration2018,7,1:3
6Adaptive robust dissipative designs on straight path control for underactuated ships显示文摘An adaptive robust control algorithm for ship straight path control system in the presence of both modeling uncertainties and the bounded disturbances is proposed. Motivated by the backstepping approach, the algorithm is developed by using the dissipation theory, such that the resulting closed-loop system is both strictly dissipative and asymptotically adaptively stable for all admissible uncertainties. Also, it is able to steer an underactuated ship along a prescribed straight path with ultimate bounds under external disturbances induced by wave, wind and ocean current. When there are no disturbances, the straight path control can be implemented in a locally asymptotically stable manner. Simulation results on an ocean-going training ship ‘YULONG’ are presented to validate the effectiveness of the algorithm.Li Tieshan Yang Yansheng Hong Biguang 2006Journal of Systems Engineering and Electronics2006,17,1:3
7Photoluminescence Properties of Porous Silicon Based on FZ(H) Si Wafer显示文摘The photoluminescence (PL) properties of porous silicon (PS) have been studied based on n-type single- crystal (111) silicon wafers (80-90Ω .cm in the resistivity). The porous silicon layers (PSL) were created by anodizing the wafers with a denuded zone of 20-40 μm formed by neutron transmutation doping (NTD) and thermal treatment at 940℃ for 4 h and then 700℃ for 2 h, two-step heating of the floating-zone silicon (FZ Si) grown in a hydrogen (H2) ambience. By surface modification with stannic chloride or amine immersion and rapid thermal oxidation (RTO), the PL peak position from the PS can be qualitatively controlled factitiously. The as-prepared PS shows an orange-yellow luminescence, while the modified samples emit red, green and blue luminescence. Mechanisms for the different colors of the PL are discussed. Fourier transform infrared (FTIR) is carried out to analyze the differences in the structural configuration of the PS samples.Yuejiao He, Huaixiang Li, Chenghua Guo, Guirong Liu, Yansheng Chen, Shuzhen Duan (Institute of Semiconductors, Shandong Normal University, Jinan 250014, China Metallurgy School, University of Science and Technology Beijing, Beijing 100083, China) 2001Rare Metals2001,20,1:2
8Abundant heterointerfaces in MOF-derived hollow CoS_(2)-MoS_(2) nanosheet array electrocatalysts for overall water splitting显示文摘Rational coupling of hydrogen evolution reaction(HER) and oxygen evolution reaction(OER) catalysts is extremely important for practical overall water splitting,but it is still challenging to construct such bifunctional heterostructures.Herein,we present a metal-organic framework(MOF)-etching strategy to design free-standing and hierarchical hollow CoS_(2)-MoS_(2) heteronanosheet arrays for both HER and OER.Resulting from the controllable etching of MOF by MoO_(4)^(2-) and in-situ sulfuration,the obtained CoS_(2)-MoS_(2) possesses abundant heterointerfaces with modulated local charge distribution,which promote water dissociation and rapid electrocatalytic kinetics.Moreover,the two-dimensional hollow array architecture can not only afford rich surface-active sites,but also facilitate the penetration of electrolytes and the release of evolved H_(2)/O_(2) bubbles.Consequently,the engineered CoS_(2)-MoS_(2) heterostructure exhibits small overpotentials of 82 mV for HER and 266 mV for OER at 10 mA cm^(-2).The corresponding alkaline electrolyzer affords a cell voltage of 1.56 V at 10 mA cm^(-2) to boost overall water splitting,along with robust durability over 24 h, even surpassing the benchmark electrode couple composed of IrO_(2) and Pt/C The present work may provide valuable insights for developing MOF-derived heterogeneous electrocatalysts with tailored interface/surface structure for widespread application in catalysis and other energyrelated areas.Yuanjian Li Wenyu Wang Baojun Huang Zhifei Mao Rui Wang Beibei He Yansheng Gong Huanwen Wang 2021Journal of Energy Chemistry2021,30,6:2
9The study on the role of inflammatory cells and mediators in post-infectious functional dyspepsia显示文摘Xiaobo Li Huimin Chen Hong Lu Weiguang Li Xiaoyu Chen Yansheng Peng Zhizheng Ge 2010Scandinavian Journal of Gastroenterology2010,,5:2
10Effect of Carbon on the Paramagnetic-Antiferromagnetic Transition and γ→εMartensitic Transformation of Fe-24Mn Alloys显示文摘The effect of C content (0.014-0.39 wt pct) on the paramagnetic-antiferromagnetic transition and γ→ε martensitic transformation of Fe-24Mn alloys has been investigated by the resistivity, dilation, tensile properties measurement and microstructure examination. The results have shown that C decreases T_N; increases the thermal expansion coefficients both above and below the T_N; increases the resistivity above the T_N and antiferromagnetic scattering resistivity below T_N. It strongly depresses the γ→ε martensitic transformation and reduces the M_s of Fe-24Mn alloys. Moreover, it increases the lattice parameter of austenite, enhances the tensile ductility, but almost does not affect the tensile strength. With increasing C content from 0.014 to 0.19 wt pct, the yield strength of Fe-24Mn alloy decreases obviously arising from the decreasing of preexisting ε martensite. but it increases from 0.19 to 0.39 wt pct C due to the solution hardening of C.Xing LU, Zuoxiang QIN, Yansheng ZHANG, Xingyu WANG and Fengxian LI (Department of Materials Science & Engineering, Dalian Railway Institute, Dalian 116028, China) Bingzhe DING and Zhuangqi HU (State Key Laboratory for RSA, Institute of Metal Research, Chi 2000Journal of Materials Science & Technology2000,16,3:2
11Resistant starch as a carrier for oral colon-targeting drug matrix system显示文摘LING CHEN XIAOXI LI YANSHENG PANG 2007Mater Sci2007,,18:1
12Theoretical study of the effect of nickle and tin doping in copper clusters 显示文摘Dong Lihua Yin Bing Zhang Li Yin Yansheng Zhang Yijun 2012Synthetic Metals2012,162,:1
13Fabrication and properties of Fe3Al-Al2O3graded coatings显示文摘Jingde Zhang Yansheng Yin Jing Li 2003Journal of Materials Processing Technology2003,134,2:1
14Continuous electro- chemical oxidation of methyl orange wastewater using a three- dimensional electrode reactor 显示文摘Zhigang Liu Feifei Wang Yansheng Li 2011Journal of Environmental Sciences2011,,:1
15Monitoring of Gene Expression Profiles and Isolation of Candidate Genes Involved in Pollination and Fertilization in Rice (Oryza Sativa L.) with a 10K cDNA Microarray显示文摘Lefu Lan Wei Chen Ying Lai Jinfeng Suo Zhaosheng Kong Can Li Ying Lu Yujun Zhang Xiangyu Zhao Xiansheng Zhang Yansheng Zhang Bin Han Jing Cheng Yongbiao Xue 2004Plant Molecular Biology2004,,4:1
16Fabrication and properties of Fe3 Al-Al2O3 graded coatings 显示文摘ZHANG Jingde YIN Yansheng LI Jing etal 2003J Mater Process Technol2003,134,2:1
17Reaction Stinering Fabrication of ( AIN, TiN)-Ai2O3 Composite显示文摘Gong Hongyu Yin Yansheng Li Aiju 2002Materials Research Bulletin2002,37,16:1
18Technology Development Analysis on Low Carbon for Power of Heavy-Duty Commercial Vehicle显示文摘Commercial vehicle industry worldwide is facing challenges from environmental pressures,stringent limits of CO_(2) emission,governmental regulations as well as ever-increased customer demands.This paper analyzes the above-mentioned challenges,especially in China,including the potential improvement to increase the brake thermal efficiency(BTE),with five levels of BTE proposed,ranging from current 45 to 60%in future,corresponding to China fuel consumption regulation(CFCR)in different phases.The authors also proposed the technology roadmaps to meet the upcoming CFCR3 and CFCR4;finally,the authors draw the conclusions to conform with ever-stringent regulation in China.Jiangwei Liu Jun Li Yongjun Wang Dalu Dong Yansheng Yin Huayu Jin Shijie Sun Huili Dou Yanbo Shi Lei Fu Fei Ge 2019Automotive Innovation2019,2,1:1
19Desulfu-rization by Oxidation Combined with Extraction Using AcidicRoom-Temperature Ionic Liquids 显示文摘Chi Yansheng Li Changping Jiao Qingzhu 2011Green Chem2011,13,5:1
20Preparation and properties of Fe3Al-based friction materials显示文摘Jing Li Yansheng Yin Hongtao Ma 2005Tribology International2005,38,2:1
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