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Probing the ultrafast dynamics in nanomaterial complex systems by femtosecond transient absorption spectroscopy

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High Power Laser Science and Engineering 2016年第3期4卷 13-22页

作者： Qun Zhang yi luo Hefei National Laboratory for Physical Sciences at the Microscale Department of Chemical Physics and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China

Over the past decade the integration of ultrafast spectroscopy with nanoscience has greatly propelled the development of nanoscience, as the key information gleaned from the mechanistic studies with the assistance of ultrafast spectroscopy enables a deeper understanding of the structure–function interplay and various interactions involved in the *** mini-review presents an overview of the recent advances achieved in our ultrafast spectroscopy laboratory that address the ultrafast dynamics and related mechanisms in several representative nanomaterial complex systems by means of femtosecond time-resolved transient absorption spectroscopy. We attempt to convey instructive, consistent information regarding the important processes, pathways, dynamics, and interactions involved in the nanomaterial complex systems,most of which exhibit excellent performance in photocatalysis.

关键词： nanomaterials time-resolved femtosecond pump-probe transient absorption spectroscopy ultrafast dynamics

Development of a roof bolter drilling control process to reduce the generation of respirable dust

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International Journal of Coal Science & Technology 2021年第2期8卷 199-204页

作者： Hua Jiang yi luo Centers for Disease Control and Prevention National Institute for Occupational Safety and HealthPittsburghPAUSA Department of Mining Engineering West Virginia UniversityMorgantownWVUSA

The drilling operation in the roof bolting process,especially in hard rock,generates excessive respirable coal and quartz dusts,which could expose the roof bolting operator to continued health *** research has shown that the amount of respirable dust produced is dependent on the main drilling parameters,specifically the drilling rotational and penetration *** this paper,a roof bolter drilling control process was proposed to reduce the generation of respirable *** on the analysis of laboratory drilling test results,a rational drilling control process(adjusting rotational and penetration rates)to achieve the optimal drilling parameter for different rock types was *** this process,the ratio between specific energy and rock uniaxial compressive strength was used as the index to determine the optimal operation *** recommended drilling operation range for the rock type used in the experiment was provided,and the reduction in respirable dust generation was *** following this control process,the drilling efficiency can be monitored in real time,so the system can stay in a relatively high-energy efficiency with less respirable dust production from the drilling *** algorithm is targeted to be incorporated into the current roof bolter drilling control system for drilling automation so that a safe and productive drilling operation can be conducted in a healthy working environment.

关键词： Roof bolter Drilling control Respirable dust Specific energy

Multicomponent remote C(sp^(2))–H bond addition by Ru catalysis:An efficient access to the alkylarylation of 2H-imidazoles

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Chinese Chemical Letters 2024年第10期35卷 257-261页

作者： yi luo Lin Dong Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial TechnologyWest China School of PharmacySichuan UniversityChengdu 610041China

Sequential C–H bond addition with two different coupling partners is a powerful method for the rapid and modular construction of complex molecules based on simple starting ***,an efficient ruthenium-catalysed multicomponent long-range C–H functionalization of 2H-imidazoles was *** protocol showed good substrate suitability and yielded alkyl arylation products with potential biological activity.

关键词： Remote C-H functionalization Multi-component reaction Ruthenium catalysis 2H-Imidazoles

Configuration model of partial repairable spares under batch ordering policy based on inventory state

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Chinese Journal of Aeronautics 2014年第3期27卷 558-567页

作者： Ruan Minzhi luo yi Li Hua Office of Research & Development Naval University of Engineering Department of Weaponry Engineering Naval University of Engineering

Rational planning of spares configuration project is an effective approach to improve equipment availability as well as reduce life cycle cost （LCC）. With an analysis of various impacts on support system, the spares demand rate forecast model is constructed. According to systemic analysis method, spares support effectiveness evaluation indicators system is built, and then, initial spares configuration and optimization method is researched. To the issue of discarding and con-sumption for incomplete repairable items, its expected backorders function is approximated by Laplace demand distribution. Combining the （s-1, s） and （R, Q） inventory policy, the spares resup-ply model is established under the batch ordering policy based on inventory state, and the optimi-zation analysis flow for spares configuration is proposed. Through application on shipborne equipment spares configuration, the given scenarios are analyzed under two constraint targets：one is the support effectiveness, and the other is the spares cost. Analysis reveals that the result is consistent with practical regulation;therefore, the model＇s correctness, method＇s validity as well as optimization project＇s rationality are proved to a certain extent.

关键词： Batch ordering Inventory state Operations research Partial repairable spares Support effectiveness evaluation

Theoretical Mechanistic Studies of Rh-Catalyzed c(sp^3)-H Amination:A Comparison with Co Analogue and Metal Effects

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Chinese Journal of Chemistry 2020年第12期38卷 1526-1532页

作者： Yang Yu Gen luo Jimin Yang yi luo State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalianLiaoning 116024China Institutes of Physical Science and Information Technology Anhui UniversityHefeiAnhui 230601China

of main observation and conclusion The mechanism of Rh-catalyzed C(sp^3)—H amination has been computationally *** reaction mechanism mainly involves sequential C(sp^3)—H activation,decarboxylation,nitrene migration insertion,and protonation *** concerted metalation deprotonation(CMD)and external base assisted deprotonation(EBAD)pathways are found for the involved C(sp^3)—H activation in both Rh and Co analogous *** is different from the previously reported C(sp^2)—H activation,where the CMD is *** key mechanistic difference between the two systems is found to be in the C(sp^3)—H activation *** comparison with Rh species,the lower activity of Co complex toward the C(sp^3)—H activation could be ascribed to smaller atomic size of Co and thus larger steric repulsion between ancillary ligand and substrate along with the CMD *** view of the EBAD pathway,however,the lower activity of Co species could be imputed to the triplet nature of Co center,which is against the electron transfer from the electron-rich carbon atom of the deprotonating C(sp^3)—H bond to the Co *** to the subsequent decarboxylation and nitrene insertion steps,compared with the Co system,the relatively lower reactivity of Rh species is partially due to the stronger Rh—N bond,and the higher Ti(Rh—N)and n^*(Rh—N)orbital energies of the corresponding transition state structure.

关键词： structure. activation steps

Conductivity of carbon-based molecular junctions from ab-initio methods

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Frontiers of physics 2014年第6期9卷 748-759页

作者： Xiao-Fei Li yi luo School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu 610054 China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China KTH Royal Institute of Technology School of Biotechnology Division of Theoretical Chemistry and Biology S-106 91 Stockholm Sweden

Carbon nanomaterials （CNMs） are prompting candidates tor next generational electronics. In this review we provide a mini overview of recent results on the conductivity of carbon-based molecular junctions obtained from ab-mitio methods. CNMs used as nanoelectrodes and molecular materials in molecular junctions are discussed. The flmctionalities that include the nanomechanically controlled molecular conductance switches, negative differential resistance devices, and electronic rectifiers realized by using CNMs have been demonstrated.

关键词： carbon nanotubes graphene all-carbon nanodevice quantum transport ab-initio molecular dynamics simulations

Advanced experimental methods toward understanding biophysicochemical interactions of interfacial biomolecules by using sum frequency generation vibrational spectroscopy

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Science China Chemistry 2014年第12期57卷 1646-1661页

作者： YE Shu Ji luo yi Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics University of Science and Technology of China Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China

Sum frequency generation vibrational spectroscopy(SFG-VS)has been demonstrated to be a powerful technique to study the interfacial structures and interactions of biomolecules at the molecular *** most previous studies mainly collected the SFG spectra in the frequency range of 1500–4000 cm-1,which is not always sufficient to describe the detailed interactions at surface and *** knowledge of the complex biophysicochemical interactions between biomolecules and surface requires new ideas and advanced experimental methods for collecting SFG vibrational *** introduced some advanced methods recently exploited by our group and others,including(1)detection of vibration modes in the fingerprint region;(2)combination of chiral and achiral polarization measurements;(3)SFG coupled with surface plasmon polaritons(SPPs);(4)imaging and microscopy approaches;and(5)ultrafast time-resolved SFG *** technique that we integrated with these advanced methods may help to give a detailed and high-spatial-resolution 3D picture of interfacial biomolecules.

关键词： protein cholesterol 3D interfacial structures fingerprint region amide III chiral polarization surface plasmon polaritons time-resolved

Making True Amplitude Angle Domain Common Image Gathers Using Invertible Radon Transform

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Communications in Computational Physics 2020年第6期28卷 128-140页

作者： Hongwei Liu yi luo EXPEC Advanced Research Center Saudi Arabia

Converting subsurface offset domain common image gathers(ODCIGs)to angle domain common image gathers(ADCIGs)through a Radon Transform(RT)in either the spatial or wavenumber domain is efficient and valid except for the distortion of both frequency spectrum and amplitude versus angle(AVA)*** paper presents two modifications to the existing method to keep the frequency spectrum of the resultant ADCIGs the same as the input data and to preserve the relative *** spectrum invariance is achieved by replacing the conventional RT or slant slack by an invertible *** preservation is obtained by applying an amplitude correction factor in the angle *** on both synthetic and field datasets validate the accuracy of these modifications.

关键词： True amplitude ADCIG reverse time migration invertible Radon transform

Two-way coupling of unsaturated-saturated flow by integrating the SWAT and MODFLOW models with application in an irrigation district in arid region of West China

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Journal of Arid Land 2011年第3期3卷 164-173页

作者： yi luo Marios SOPHOCLEOUS Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Kansas Geological Survey University of Kansas Lawrence Kansas 66047 USA

This paper presents the realization of two-way coupling of the unsaturated-saturated flow interactions of the SWAT2000 and MODFLOW96 models on the basis of the integrated surface/groundwater model SWATMOD99, and its application in Hetao Irrigation District （HID）, Inner Mongolia, China. Major revisions and enhancements were made to the SWAT2000 and MODFLOW models for simulating the detailed hydrologic budget and coupled unsaturated and saturated interactions, and irrigation canal hydrology for the HID. The simulation results of seasonal groundwater recharge to and evaporate from the shallow groundwater, and the annual water budget over the district are presented and discussed. The results implied the necessity of two-way coupling of the unsaturated-saturated interactions when groundwater is shallow, and the feasibility of making comprehensive use of the information coming from both the surface water and groundwater models to make a more physically-based assessment of the coupled interactions.

关键词： SWAT MODFLOW SWATMOD coupled unsaturated-saturated flow irrigation canals groundwater recharge groundwater evaporation