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Cultivar selection can increase yield potential and resource use efficiency of spring maize to adapt to climate change in Northeast China

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Journal of Integrative Agriculture 2021年第2期20卷 371-382页

作者： SU Zheng-e liu Zhi-juan BAI Fan ZHANG Zhen-tao SUN Shuang HUANG Qiu-wan liu Tao liu Xiao-qing YANG Xiao-guang College of Resources and environmental Sciences China Agricultural UniversityBeijing 100193P.R.China Chinese Academy of Meteorological Sciences Beijing 100081P.R.China

Northeast China (NeC) is one of the major maize production areas in ***-climatic resources have obviously changed,which will seriously affect crop growth and development in this *** is important to investigate the contribution of climate change adaptation measures to the yield and resource use efficiency to improve our understanding of how we can effectively ensure high yield and high efficiency in the *** this study,we divided the study area into five accumulated temperature zones (ATZs) based on growing degree days (GDD).Based on the meteorological data,maize data (from agrometeorological stations) and the validated APSIM-Maize Model,we first investigated the spatial distributions and temporal trends of maize potential yield of actual planted cultivars,and revealed the radiation use efficiency (RUe) and heat resource use efficiency (HUe) from 1981 to *** according to the potential growing seasons and actual growing seasons,we identified the utilization percentages of radiation (P_R) resource and heat resource (P_H) for each ATZ under potential production from 1981 to ***,we quantified the contributions of cultivar changings to yield,P_R and P_H of *** results showed that during the past 37 years,the estimated mean potential yield of actual planted cultivars was 13 649 kg ha^(–1),ranged from 11 205 to 15 257 kg ha^(–1),and increased by 140 kg ha^(–1) per *** potential production,the mean values of RUe and HUe for the actual planted maize cultivars were 1.22 g MJ^(–1) and 8.58 kg (℃ d)^(–1) ha^(–1).RUe showed an increasing tendency,while HUe showed a decreasing *** lengths of the potential growing season and actual growing season were 158 and 123 d,and increased by 2 and 1 d per decade.P_R and P_H under potential production were 82 and 86%,respectively and showed a decreasing tendency during the past 37 *** indicates that actual planted cultivars failed to make full use of climate ***,resul

关键词： APSIM maize potential yield radiation use efficiency resource utilization percentage cultivar selection

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A convex relaxation approach for power flow problem

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Journal of Modern Power Systems and Clean energy 2019年第6期7卷 1399-1410页

作者： Saeed D.MANSHADI Guangyi liu Mohammad e.KHODAYAR Jianhui WANG Renchang DAI electrical and Computer engineering Department San Diego State UniversitySan DiegoCA 92182USA Global energy Interconnection Research Institute North America San JoseCA 95134USA Department of electrical and Computer engineering Southern Methodist UniversityDallasTX 75275USA

A solution to the power flow problem is imperative for many power system applications and several iterative approaches are employed to achieve this ***,the chance of finding a solution is dependent on the choice of the initial point because of the nonconvex feasibility region of this *** this paper,a non-iterative approach that leverages a convexified relaxed power flow problem is employed to verify the existence of a feasible *** ensure the scalability of the proposed convex relaxation,the problem is formulated as a sparse semi-definite programming *** variables associated with each maximal clique within the network form several positive semidefinite *** and network reconfiguration schemes are employed to improve the tightness of the proposed convex relaxation in order to validate the existence of a feasible solution for the original non-convex *** case studies including an ill-conditioned power flow problem are examined to show the effectiveness of the proposed approach to find a feasible solution.

关键词： Convex relaxation Ill-conditioned power flow Power flow Network reconfiguration

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Simulation study of coupled particle cascade and finite element analysis for beam dump of DALS

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Radiation Detection Technology and Methods 2024年第2期8卷 1254-1263页

作者： Liming Huang Dejun e Kai Tao Changqi liu Institute of Advanced Science Facilities ShenzhenGuangdongChina Dalian Institute of Chemical Physics Chinese Academy of SciencesDalianLiaoningChina

Purpose Charged particle cascade simulations,in conjunction with finite element thermal and mechanical calculations,are essential for addressing engineering challenges associated with the design of accelerator beam *** study aims to investigate the integration of the FLUKA Monte Carlo program and the COMSOL finite element program as indispensable tools in the development of advanced models for spatial energy deposition distributions,temperature assessments,and stress analysis within the DALS beam *** The paper delves into aspects of model development,data transfer,and practical applications,focusing on the successful coupling of FLUKA Monte Carlo simulations with COMSOL finite element *** of millions of elements were created and utilized to estimate spatial energy deposition distributions,assess temperatures,and analyze stresses within the critical absorber of the DALS beam *** study comprehensively analyzes the process from the impact of high-energy electron beam on the beam dump to the spatial distribution of energy deposition,providing input for subsequent thermal and structural *** The successful coupling of FLUKA and COMSOL enabled the calculation of spatial temperature distributions and structural analyses of the absorber within the DALS beam *** utilization of tens of millions of defined bins ensured seamless data transfer from the particle cascade simulation to finite element analysis,guaranteeing high resolution and accuracy in the *** results provide valuable insights into the thermal and mechanical behavior of the beam dump absorber,a critical safety component in accelerator *** The study demonstrates that the integration of FLUKA Monte Carlo simulations with COMSOL finite element analyses is a dependable and efficient tool for addressing real-world engineering challenges,particularly those related to the design of beam dumps in accelerator systems with charged particle ***

关键词： Particle cascade Finite element Coupled simulation FLUKA COMSOL

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Pre-harvest spraying of oxalic acid improves postharvest quality associated with increase in ascorbic acid and regulation of ethanol fermentation in kiwifruit cv. Bruno during storage

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Journal of Integrative Agriculture 2019年第11期18卷 2514-2520页

作者： Maratab Ali liu Meng-meng WANG Zhen-e LI Sheng-e JIANG Tian-jia ZHeNG Xiao-lin College of Food Science and Biotechnology Zhejiang Gongshang University

The kiwifruit trees(Actinidia deliciosa ***)were sprayed with 5 mmol L-1 oxalic acid(OA)or water(as control)at 130,137 or 144 d after full-blossom,and then the fruit were harvested at commercial maturity and stored at room temperature(20±1)℃ for 13 *** effect of pre-harvest spraying of OA on postharvest quality of kiwifruit was evaluated during *** OA spraying slowed the increase in soluble solids content(SSC)and decrease in titratable acid(TA),as well as increased contents of ascorbic acid(AsA)and total-AsA accompanied with higher AsA/DHA ratio in kiwifruit during ***,the OA spraying significantly reduced the contents of acetaldehyde and ethanol in kiwifruit,along with significant decrease in activities of enzymes involved in ethanol fermentation metabolism during the later period of storage,which was beneficial to control off-flavor associated with over accumulation of ethanol during *** was suggested that pre-harvest spraying of OA might maintain the postharvest quality of kiwifruit in relation to delay in fruit ripening,AsA maintenance and regulation of ethanol fermentation.

关键词： ethanol metabolism kiwifruit oxalic acid pre-harvest spraying postharvest quality

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Synchronization of switched Boolean networks with impulsive effects

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International Journal of Biomathematics 2018年第6期11卷 93-110页

作者： xiaojing Xu Yansheng liu Haitao Li Fuad e. Alsaadi School of Mathematics and Statistics Shandong Normal University Jinan 250014 P. R. China Department of electrical and Computer engineering Faculty of engineering King Abdulaziz University Jeddah 21589 Saudi Arabia

This paper studies the state/output synchronization of switched Boolean networks （SBNs） with impulsive effects via the algebraic state space representation （ASSR） approach. First, an algebraic form is established for SBNs with impulsive effects via ASSR. Second, based on the algebraic form, some necessary and sufficient conditions are presented for the state/output synchronization of SBNs with impulsive effects under arbitrary switching signals. Third, two special kinds of switching signals, that is, free switching signal and feedback switching signal, are considered for the state synchroniza-tion of SBNs with impulsive effects. Finally, two illustrative examples are worked out to show the effectiveness of the obtained results.

关键词： Switched Boolean network impulsive effects synchronization algebraic state space representation.

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MODeLING OF 'BANDING' MICROSTRUCTURe FORMATION IN CeNTRIFUGALLY SOLIDIFIeD Ti-6Al-4V ALLOY

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Acta Metallurgica Sinica(english Letters) 2008年第6期21卷 399-408页

作者： D.R. liu e：J. Guo L.P. Wang School of Materials Science and engineering Harbin University of Science and Technology Harbin 150040 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Numerical investigations of the ＇banding＇ microstructure formation during solidification of Ti-6Al-4 V alloy in the centrifugal casting are conducted using a multi-scale model, which combines the finite difference method （FDM） at the macroscale with a cellular automaton （CA） model at the microscale. The macro model is used to simulate the fluid flow and heat transfer throughout the casting. The micro model is used to predict the nucleation and growth of microstructures. With the proposed model, numerical simulations are performed to study the influences of the nucleation density, mould rotation speed, and casting size upon the ＇banding＇ microstructure formation. It is noted that changing the nucleation density has a minor effect on the microstructure formation. The rotation speed promotes the formation of ＇banding＇ microstructure, which is more noticeable for larger size castings. The ＇major mechanism responsible for this ＇banding＇ phenomenon is the spatial variation in cooling rates created by centrifugal force.

关键词： Modeling 'Banding' microstructure Ti-6Al-4V alloy Centrifugal casting

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Sustained local delivery of insulin for potential improvement of peri-implant bone formation in diabetes

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Science China(Life Sciences) 2012年第11期55卷 948-957页

作者： HAN Yong ZHANG XueYan e LingLing WANG DongSheng liu HongChen Institute of Stomatology Chinese General Hospital of PLABeijing 100853China Chinese PLA 66400 Hospital Beijing 100039China

Dental implantation is an effective standard treatment modality to restore missing teeth and maxillofacial defects. However, in diabetics there is an increased risk for implant failure due to impaired peri-implant osseous healing. early topical insulin treat- ment was recently shown to normalize diabetic bone healing by rectifying impairments in osteoblastic activities. In this study, insulin/poly(lactic-co-glycolic acid) (PLGA) microspheres were prepared by a double-emulsion solvent evaporation method. Microspheres were then incorporated in fibrin gel to develop a local drug delivery system for diabetic patients requiring im- plant treatment. In vitro release of insulin from fibrin gel loaded with these microspheres was assessed, and sustained prolonged insulin release over 21 days ascertained. To assess the bioactivity of released insulin and determine whether slow release might improve impaired diabetic bone formation, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT), alkaline phosphatase (ALP) activity, mineralized nodule formation, and eLISA (enzyme-linked immunosorbent assay) assays were performed. The insulin released from the drug delivery system stimulated cell growth in previously inhibited cells, and ameliorated the impaired bone-forming ability of human MG-63 cells under high glucose conditions. Fibrin gel loaded with insulin/PLGA microspheres shows potential for improving peri-implant bone formation in diabetic patients.

关键词： insulin controlled release peri-implant bone formation diabetes hyperglycemia human MG-63 cells osteoblastic ac-tivity

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A Strong Stability-Preserving Predictor-Corrector Method for the Simulation of elastic Wave Propagation in Anisotropic Media

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Communications in Computational Physics 2012年第9期12卷 1006-1032页

作者： D.H.Yang N.Wang e.liu Department of Mathematical Sciences Tsinghua UniversityBeijing 100084P.R.China Department of Geophysics China University of Mining and TechnologyXuzhouJiangsu ProvinceP.R.China

In this paper,we propose a strong stability-preserving predictor-corrector(SSPC)method based on an implicit Runge-Kutta method to solve the acoustic-and elastic-wave *** first transform the wave equations into a system of ordinary differential equations(ODes)and apply the local extrapolation method to discretize the spatial high-order derivatives,resulting in a system of semi-discrete *** we use the SSPC method based on an implicit Runge-Kutta method to solve the semi-discrete ODes and introduce a weighting parameter into the SSPC *** top of such a structure,we develop a robust numerical algorithm to effectively suppress the numerical dispersion,which is usually caused by the discretization of wave equations when coarse grids are used or geological models have large velocity contrasts between adjacent ***,we investigate the performance of the SSPC method including numerical errors and convergence rate,numerical dispersion,and stability criteria with different choices of the weighting parameter to solve 1-D and 2-D acoustic-and elastic-wave *** the SSPC is applied to seismic simulations,the computational efficiency is also investigated by comparing the SSPC,the fourth-order Lax-Wendroff correction(LWC)method,and the staggered-grid(SG)finite *** of synthetic waveforms computed by the SSPC and analytic solutions for acoustic and elastic models are given to illustrate the accuracy and the validity of the ***,several numerical experiments are conducted for the geological models including a 2-D homogeneous transversely isotropic(TI)medium,a two-layer elastic model,and the 2-D SeG/eAGe salt *** results show that the SSPC can be used as a practical tool for large-scale seismic simulation because of its effectiveness in suppressing numerical dispersion even in the situations such as coarse grids,strong interfaces,or high frequencies.

关键词： SSPC method seismic wavefield modeling anisotropy numerical dispersion shearwave splitting

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Cloud computing for integrated stochastic groundwater uncertainty analysis

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International Journal of Digital earth 2013年第4期6卷 313-337页

作者： Yong liu Alexander Y.Sun Keith Nelson Wesley e.Hipke National Center for Supercomputing Applications University of Illinois at Urbana-ChampaignUrbanaILUSA Bureau of economic Geology University of Texas at AustinAustinTXUSA Arizona Department of Water Resources PhoenixAZUSA

One of the major scientific challenges and societal concerns is to make informed decisions to ensure sustainable groundwater availability when facing deep uncertainties.A major computational requirement associated with this is on-demand computing for risk analysis to support timely *** paper presents a scientific modeling service called‘ModflowOnAzure’which enables large-scale ensemble runs of groundwater flow models to be easily executed in parallel in the Windows Azure *** technical issues were addressed,including the conjunctive use of desktop tools in MATLAB to avoid license issues in the cloud,integration of Dropbox with Azure for improved usability and‘Drop-and-Compute,’and automated file exchanges between desktop and the *** scientific use cases are presented in this paper using this service with significant computational *** case is from Arizona,where six plausible alternative conceptual models and a streamflow stochastic model are used to evaluate the impacts of different groundwater pumping *** case is from Texas,where a global sensitivity analysis is performed on a regional groundwater availability *** of both cases show informed uncertainty analysis results that can be used to assist the groundwater planning and sustainability study.

关键词： MODFLOW groundwatersustainability uncertaintyanalysis global sensitivity analysis cloudcomputing WindowsAzure Dropbox alternative conceptual model cyberinfrastructure eScience

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estimation of wind erosion from construction of a railway in arid Northwest China

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International Soil and Water Conservation Research 2017年第2期5卷 102-108页

作者： Benli liu Larry e.Wagner Duihu Ning Jianjun Qu Dunhuang Gobi Desert Research Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China USDA-ARS Agricultural Systems Research Unit Fort CollinsCO 80526USA International Research and Training Center on erosion and Sedimentation Bejing 100048China

A state-of-the-art wind erosion simulation model,the Wind erosion Prediction System and the United States environmental Protection Agency's AP 42 emission factors formula,were combined together to evaluate wind-blown dust emissions from various construction units from a railway construction project in the dry Gobi land in Northwest *** influence of the climatic factors:temperature,precipitation,wind speed and direction,soil condition,protective measures,and construction disturbance were taken into *** by daily and sub-daily climate data and using specific detailed management fles,the process-based WePS model was able to express the beginning,active,and ending phases of construction,as well as the degree of disturbance for the entire scope of a construction *** Lanzhou-Xinjiang High-speed Railway was selected as a representative study because of the diversities of different cli-mates,soil,and working schedule conditions that could be *** erosion from different working units included the building of roadbeds,bridges,plants,temporary houses,earth spoil and barrow pit areas,and vehicle transportation were *** total wind erosion emissions,7406 t,for the first construction area of section LXS-15 with a 14.877 km length was obtained for quantitative *** method used is applicable for evaluating wind erosion from other complex surface dis-turbance projects.

关键词： Wind erosion Railway construction WePS USePA

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