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Estimation and testing of linkages between forest structure and rainfall interception characteristics of a Robinia pseudoacacia plantation on China’s Loess Plateau

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Journal of Forestry Research 2022年第2期33卷 529-542页

作者： Changkun Ma Yi Luo Mingan Shao Xiaoxu Jia State Key Laboratory of Eco-Hydraulics in Northwest Arid Region Xian University of TechnologyXianChina Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China

Understanding the interaction between canopy structure and the parameters of interception loss is essential in predicting the variations in partitioning rainfall and water resources as affected by changes in canopy structure and in implementing water-based management in semiarid forest plantations.In this study,seasonal variations in rainfall interception loss and canopy storage capacity as driven by canopy structure were predicted and the linkages were tested using seasonal filed measurements.The study was conducted in nine 50 m×50 m Robinia pseudoacacia plots in the semiarid region of China’s Loess Plateau.Gross rain-fall,throughfall and stemflow were measured in seasons with and without leaves in 2015 and 2016.Results show that measured average interception loss for the nine plots were 17.9% and 9.4% of gross rainfall during periods with leaves (the growing season) and without leaves, respectively. Average canopy storage capacity estimated using an indirect method was 1.3 mm in the growing season and 0.2 mm in the leafless season. Correlations of relative interception loss and canopy storage capacity to canopy variables were highest for leaf/wood area index (LAI/WAI) and canopy cover, fol-lowed by bark area, basal area, tree height and stand density. Combined canopy cover, leaf/wood area index and bark area multiple regression models of interception loss and canopy storage capacity were established for the growing season and in the leafless season in 2015. It explained 97% and 96% of the variations in relative interception loss during seasons with and without leaves, respectively. It also explained 98% and 99% of the variations in canopy storage capacity during seasons with and without leaves, respectively. The empiri-cal regression models were validated using field data col-lected in 2016. The models satisfactorily predicted relative interception loss and canopy storage capacity during seasons with and without leaves. This study provides greater under-standing about the effects of changes in tree canopy struc

关键词： Rainfall interception loss Canopy storage Canopy structure Regression models China’s Loess Plateau

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 nanosystems.This 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

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 investigated.The reaction mechanism mainly involves sequential C(sp^3)—H activation,decarboxylation,nitrene migration insertion,and protonation steps.Competitive 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 systems.This is different from the previously reported C(sp^2)—H activation,where the CMD is dominant.The key mechanistic difference between the two systems is found to be in the C(sp^3)—H activation step.In 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 pathway.In 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 center.As 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

Coastal mudflats as reservoirs of extracellular antibiotic resistance genes: Studies in Eastern China

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Journal of Environmental Sciences 2023年第7期129卷 58-68页

作者： Qingbin Yuan Xiaolin Wang Hui Fang Yuan Cheng Ruonan Sun Yi Luo College of Environmental Science and Engineering Nanjing Tech UniversityNanjing 211816China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China School of Medicine Nankai UniversityTianjin 300071China Department of Civil and Environmental Engineering Rice UniversityHouston 77005USA

Despite coastal mudflats serving as essential ecological zones interconnecting terrestrial/freshwater and marine systems,little is known about the profiles of antibiotic resistance genes(ARGs)in this area.In this study,characteristics of typical ARGs,involving both intracellular(iARGs)and extracellular ARGs(eARGs)at different physical states,were explored in over 1000 km of coastal mudflats in Eastern China.Results indicated the presence of iARGs and eARGs at states of both freely present or attached by particles.The abundance of eARGs was significantly higher than that of iARGs(87.3%vs 12.7%),and their dominance was more significant than those in other habitats(52.7%-76.3%).ARG abundance,especially for eARGs,showed an increasing trend(p<0.05)from southern(Nantong)to northern(Lianyungang)coastalmudflats.Higher salinity facilitated the transformation from iARGs to eARGs,and smaller soil particle size was conducive to the persistence of eARGs in northern coastal mudflats.This study addresses the neglected function of coastal mudflats as eARGs reservoirs.

关键词： Antibiotic resistance genes(ARGs) Extracellular antibiotic resistance genes(eARGs) Coastal mudflats Amplicon sequencing Geochemical variable Mobile genetic elements

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)effect.This 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 amplitudes.The spectrum invariance is achieved by replacing the conventional RT or slant slack by an invertible RT.Amplitude preservation is obtained by applying an amplitude correction factor in the angle domain.Tests on both synthetic and field datasets validate the accuracy of these modifications.

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

Sustainable development of electroencephalography materials and technology

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SusMat 2024年第2期4卷 125-144页

作者： Ling Xiong Nannan Li Yi Luo Lei Chen Institutes for Breast Health Medicine West China HospitalSichuan UniversityChengduChina Micro/Nano Fabrication Laboratory Microsystem and Terahertz Research CenterChina Academy of Engineering PhysicsChengduChina Institute of Electronic Engineering China Academy of Engineering PhysicsMianyangChina Department of Neurology Joint Research Institution of Altitude HealthWest China HospitalSichuan UniversityChengduChina

Electroencephalogram(EEG)is one of the most important bioelectrical signals related to brain activity and plays a crucial role in clinical medicine.Driven by continuously expanding applications,the development of EEG materials and technology has attracted considerable attention.However,systematic analysis of the sustainable development of EEG materials and technology is still lacking.This review discusses the sustainable development of EEG materials and technology.First,the developing course of EEG is introduced to reveal its significance,particularly in clinical medicine.Then,the sustainability of the EEG materials and technology is discussed from two main aspects:integrated systems and EEG electrodes.For integrated systems,sustainability has been focused on the developing trend toward mobile EEG systems and big-data monitoring/analyzing of EEG signals.Sustainability is related to miniaturized,wireless,portable,and wearable systems that are integrated with big-data modeling techniques.For EEG electrodes and materials,sustainability has been comprehensively analyzed from three perspectives:performance of different material/structural categories,sustainablematerials for EEGelectrodes,and sustainable manufacturing technologies.In addition,sustainable applications of EEG have been presented.Finally,the sustainable development of EEG materials and technology in recent decades is summarized,revealing future possible research directions as well as urgent challenges.

关键词： clinical medicine electroencephalography technology limitations and future directions materials and electrodes sustainable development

Colloidal nanoparticles prepared from zein and casein:interactions,characterizations and emerging food applications

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Food Science and Human Wellness 2023年第2期12卷 337-350页

作者： yi Wang Wusigale Yangchao luo Department of Nutritional Sciences University of ConnecticutStorrs 06269USAKey Laboratory of Dairy Biotechnology and EngineeringMinistry of Education Key Laboratory of Dairy Products Processing Ministry of Agriculture and Rural AffairsInner Mongolia Agricultural UniversityHohhot 010018China

Protein colloidal nanoparticles(NPs)are ubiquitous present in nature and function as building blocks with multiple functions in both food formulations and biological processes.Food scientists are inspired by naturally occurring proteins to induce self-assembly behavior of protein by manipulating environmental parameters,providing opportunities to construct special and expected NPs.Zein and casein,the main proteins derived from corn and milk,are two examples of the most prevalently studied food proteins for nanoarchitectures in recent years.In this article,the compositions,structures,and physicochemical properties of these two proteins and casein derivatives are summarized as well as their interactions and characterizations.Strategies to fabricate zein-sodium caseinate based NPs are critically highlighted and illustrated.Particularly,applications such as encapsulation and delivery of bioactive compounds,producing food packaging for enhanced antioxidative and antimicrobial effects,and stabilization of emulsions to achieve fat replacement.Due to the imperative role of food proteins in diet composition,this review not only provides cutting-edge knowledge for nanoparticle construction but also opens new avenues for efficient utilization and exploitation of food proteins.

关键词： Zein Casein Nanoparticles Interactions Applications

Tianxia Qingshi(World Circumstances)in the Political World of Traditional Chinese Scholar Officials:A Case Study of the“Green Sprouts Policy Polemic”in the Early Xining Period of the Northern Song

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Social Sciences in China 2024年第1期45卷 89-105页

作者： luo yi'nan School of Government Peking University

How to deal with differences is a question that any political body must respond to.The individualist perspective emphasizes that actors will adopt measures to exclude or even eliminate divergent claims in order to gain control over interests power or statutory policy,but the rich experience of traditional Chinese scholar officials offers the possibility of going beyond the limitations of this perspective.The perspective of“tianxia qingshi(world circumstances)”as a new narrative reveals a unique practical logic and dynamic mechanism in Chinese political civilization that have been overlooked by the individualist perspective.The“Green Sprouts policy(qing miao fa)polemic”in the early years of the New Policies era of the Northern Song dynasty(960-1127)presents a historical situation that has not been given full attention by existing research.

关键词： tianxia qingshi(world circumstances) “Green Sprouts policy polemic ”dispute practice scholar-official politics

A Future Perspective on In-Sensor Computing

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Engineering 2022年第7期8卷 19-21页

作者： Wen Pan Jiyuan Zheng Lai Wang Yi Luo Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China

The use of artificial intelligence(AI)is escalating rapidly in most applications nowadays,thanks to breakthroughs in biology and mathematics.Novel hardware systems are greatly needed to meet the requirements of AI,which include computing capacity and energy efficiency.One of the major aims of AI is to mimic the functions of the human brain,which are enabled by the massive interconnection of neurons.For example,the visual cortex is the region of the brain that processes visual information.The human vision system,which includes the visual cortex,is highly compact and energy efficient.The retina contains hundreds of millions of light-sensitive neurons interconnected by preprocessing and control neurons to enhance image quality,extract features,and recognize objects.Once light-sensitive neurons have detected trivial signals,they are disabled thereafter,and only the critical information is transferred to the cortex for deep processing.

关键词： hardware artificial breakthrough