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A new barycenter code discriminator for multi-access interference

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Science China(Information Sciences) 2014年第2期57卷 113-121页

作者： wang YongQing LI Cong XU duo YANG Na School of Information and Electronics Beijing Institute of Technology

The performance of code tracking loop in direct sequence spread spectrum system decreases because of multi-access *** order to solve this problem,this paper presents a new code discriminator based on barycenter *** calculating the barycenter of code phase by multiple PN code branches’correlation results,PN code phase error can be *** analysis of new discriminator’s performance is given,and it is indicated that the code tracking loop using this algorithm can also solve the problems of low ranging precision and large mean deviation caused by multi-access *** efciency of the proposed algorithm is verified by simulation and measurements and the new discriminator is used in an aerospace engineering project successfully.

关键词： direct sequence spread spectrum code tracking loop code discriminator barycenter tracking

Flow Field and Heat Transfer Analysis of Local Structure for Regenerative Cooling Panel

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Journal of Thermal Science 2012年第2期21卷 172-178页

作者： Yu Feng Hongyan Huang Tao Li duo Zhang Zhongqi wang Harbin Institute of Technology No. 92 Xidazhi Street 150001 Harbin China

Local structure of cooling panel has great effects on the heat transfer in the cooling channel for the scramjet. The problems of flow dead area and mass flow rate non-uniform distribution caused by the local structure effect the cooling effectiveness in the channel seriously. Numerical simulation to the flow field of scramjet cold panel with four different fuel injection island structures respectively has been carried out using the CFD commercial software-CFX in this research. The results reveal that flow dead area has been eliminated and flow field has been improved for the optimized structure. Furthermore, local resistance loss has been decreased and the mass flow rate non-uniform distribution in the channel has been reduced. Based on the optimized results, some suggestions about the local design of cooling panel have been proposed in this research.

关键词： numerical simulation cooling panel fuel injection island

A CO_(2)/N_(2)-Responsive Pickering Emulsion Stabilized by Novel Switchable Surface-Active Alumina Nanoparticles

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Engineering 2022年第5期8卷 48-54页

作者： An Chen duo wang Jingsi Chen Jianhong Xu Hongbo Zeng State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Department of Chemical and Materials Engineering University of AlbertaEdmontonAB T6G 1H9Canada

This article reports the development of a novel switchable Pickering emulsion with rapid CO_(2)/N_(2) respon-siveness,which is stabilized using alumina nanoparticles hydrophobized in situ with a trace amount of a switchable superamphiphile via electrostatic *** the introduction of CO_(2) for 30 s,the Pickering emulsion can be spontaneously demulsified with complete phase separation;the emulsion can then be reconstructed in response to N_(2) purging for 10 min followed by ***,the stable Pickering emulsion can be stored for more than 60 days at room temperature with-out any visible *** CO_(2)/N_(2)-responsive behavior of the switchable Pickering emulsion is attribu-ted to the reversible desorption/adsorption of the switchable surfactants on the surfaces of the alumina nanoparticles upon the alternative bubbling of CO_(2)or N_(2).Thanks to the simple fabrication of the surfac-tant and the hydrophobization of the alumina nanoparticles,this research has developed an extremely facile and cost-efficient method for preparing a rapidly CO_(2)/N_(2)-responsive switchable Pickering *** dosage of the switchable surfactants has been significantly reduced by nearly 1500 times(from 150 to 0.1 mmol·L^(-1))as compared with the dosage used in previous ***,the as-prepared CO_(2)/N_(2)-responsive switchable Pickering emulsion is environmentally friendly,mild,and nontoxic;thus,it holds great potential for practical applications with considerable economic and environmental benefits,such as oil transport,fossil fuel production,environmental gases detection,and the encapsulation and release of active ingredients.

关键词： CO_(2)/N_(2)responsive Pickering emulsion Switchable surfactant Alumina nanoparticles Superamphiphile

A sensitive and validated LC-MS/MS method for high-throughput determination of pomalidomide in human plasma and pharmacokinetic studies

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Chinese Chemical Letters 2022年第2期33卷 916-919页

作者： Chang shu Teng-Fei Li duo Li Zhong-Qiu Li Xing-Hua Xia State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Pharmaceutical Analysis School of PharmacyChina Pharmaceutical UniversityNanjing 210009China School of Pharmacy Department of Clinical PharmacologySir Run HospitalNanjing Medical UniversityNanjing 211166China

Pomalidomide is an immunomodulatory agent (IMiD) that has been approved by the US Food and Drug Administration (FDA) for clinical treatment of patients with multiple *** this work,we developed a sensitive and validated LC-MS/MS method for high-throughput determination of pomalidomide over the range of 1.006-100.6 ng/mL(R^(2)=0.9991) in human plasma and pharmacokinetic studies.A liquid-liquid extraction method using ethyl acetate was applied to extract pomalidomide and afatinib (as an internal standard,IS) from human *** separation was performed on a Hedera ODS column (150 mm×2.1 mm,5μm) with security guard C18 column (4 mm×2.0 mm) at 40℃.Methanol and 10 mmol/L aqueous solution of ammonium acetate containing 0.1%formic acid were used as a gradient elution mobile phase,and the flow rate was 0.4 mL/min.A triple quadruple tandem mass spectrometer using multiplex reaction monitoring mode (MRM) with electrospray ionization (ESI) positive ionization was *** precursor to product ion transitions for the quantitative analysis of pomalidomide and the IS were m/z 274.2→163.1 and m/z 486.1→371.1,*** established method has been validated according to regulatory guideline,and the results were all within the acceptance *** validated LC-MS/MS method was successfully applied to analyze samples obtained from clinical pharmacokinetics study after oral administration of pomalidomide (4 mg) capsules in human.

关键词： Pomalidomide Liquid-liquid extraction LC–MS/MS method Pharmacokinetic Human plasma

Selective 1,4-arylsulfonation of 1,3-enynes via photoredox/nickel dual catalysis

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Organic Chemistry Frontiers 2022年第3期9卷 788-794页

作者： Chao Li duo-duo Hu Ruo-Xing Jin Bing-Bing Wu Cheng-Yu wang Zhuofeng Ke Xi-Sheng wang School of Materials Science&Engineering School of ChemistryPCFM LabSun Yat-Sen UniversityGuangzhou 510275P.R.China Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry Center for Excellence in Molecular Synthesis of CASUniversity of Science and Technology of China96 Jinzhai RoadHefeiAnhui 230026China

A photoredox/nickel-catalyzed selective 1,4-arylsulfonation of 1,3-enynes to access structurally diverse sulfone-containing allenes has been *** radical cascade transformation featured easy manipulation,mild conditions,low catalyst loading,broad substrate scope,and large-scale *** preliminary mechanistic studies indicated a possible radical-relay process enabled by the radical capture of nickel(0)species.

关键词： synthesis nickel redox

Raising medium function of environmental engineering by using life rubbish to produce carpet turf

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Journal of Environmental Sciences 2000年第4期12卷 498-505页

作者： duo Li an, ZHAO shu lan (College of Chemistry and Biology, Tianjin Normal University, Tianjin 300074, China) 天津师范大学天津 3 0 0 0 74

Abundant material with low cost was utilized to raise medium function of producing carpet turf by life rubbish. The results showed that the material used could strikingly raise water retentiveness and ventilating of medium. Through the determination of the effect of each growth index of several turfgrass, emergence density, plant height, root growth and individual plant′s net primary production were all positively related to the material′s amount mixed, showing that the mixture of material could promote turfgrass growth, further proving that the material used raised medium function of producing carpet turf by life rubbish and made most use of life rubbish resources. It provided a scientific base is for application of environmental engineering by using life rubbish to produce carpet turf. So the study had both important theoretic meaning and applied value.

关键词： life rubbish carpet turf medium function environmental engineering

Holocene climate changes and paleoecology on the Tibetan Plateau:recent advances

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Frontiers of Earth Science 2023年第4期17卷 899-904页

作者： Juzhi HOU Xianyong CAO duo WU Mingda wang Group of Alpine Paleoecology and Human Adaptation State Key Laboratory of Tibetan Earth SystemResources and EnvironmentInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China MOE Key Laboratory of Western China’s Environmental Systems College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China School of Geographical Sciences Liaoning Normal UniversityDalian 116029China

*** Tibetan Plateau(TP)is the largest and highest terrain on the Earth,comprising more than 80%of continents higher than 4000 m above sea *** extremely high elevation resulted in cold and arid climate,sparse vegetation,limited available water resources,thin oxygen on TP,as well as desolated landscape,which makes it one of the most unfriendly habitable places on the ***,ancient humans lived on TP as early as 200 thousand years ago(Chen et al.,2019;Zhang et al.,2020),and developed ancient civilizations,including the Tibetan Empire,Guge Kingdom in historical periods.

关键词： Tibetan Plateau landscape

Multi-model coupling-based dynamic control system of ladle slag in argon blowing refining process

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Journal of Iron and Steel Research International 2023年第5期30卷 926-936页

作者： Guang-da Bao Ting Wu duo-gang wang Xiao-bin Zhou Hai-chuan wang School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina Shanghai Meishan Iron and Steel Co. Ltd.Nanjing 210039JiangsuChina

Since the current slagging of argon blowing refining process is relatively fixed,which cannot adapt to the fluctuation of converter smelting process,it poses the problems of poor metallurgical property of refining slag and a large amount of molten *** optimization system coupled with multiple models was proposed to dynamic control the ladle slagging in the argon blowing refining *** can compile the optimal dynamic slagging scheme in real time under the guarantee of deoxidation performance and reasonable *** argon blowing refining slag composition range of CaO/Al_(2)O_(3)=1.3-1.7,CaO/SiO_(2)=6-12,w(MgO)=2%-6% was determined based on FeO activity and liquidus temperature by equilibrium thermodynamic *** addition,it demonstrated better performance in the viscosity prediction task of the presented Visual Geometry Group 16-like one-dimensional convolutional neural network deep learning algorithm versus the Random Forest ensemble learning algorithm,as the adjusted coefficients of determination were 0.9712 and 0.9637,*** the system was applied in operation,the argon blowing refining process was stable,and the steel yield was enhanced,which promoted the intelligent steelmaking level while achieving the cost reduction and efficiency improvement.

关键词： Argon blowing refining process Deoxidation Viscosity model Deep learning Intelligent steelmaking

Submanifolds of P^(n)(l)with Splitting Tangent Sequence

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Acta Mathematica Sinica,English Series 2022年第2期38卷 397-405页

作者： duo LI School of Mathematics(Zhuhai) Sun Yat-sen UniversityZhuhai 519082P.R.China

Let l be a line in a projective space *** consider the blowing up P^(n)(l)of Pnalong *** that X is a smooth closed subvariety of P^(n).If the strict transform of X in P^(n)(l)has a splitting tangent sequence and dim X... 详细信息

关键词： Blowing up tangent sequence splitting