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Metabolomics reveals the key role of oxygen metabolism in heat susceptibility of an alpine-dwelling ghost moth, Thitarodes xiaojinensis (Lepidoptera: Hepialidae)

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Insect Science 2019年第4期26卷 695-710页

作者： Wei zhu Qian meng Huan Zhang meng-long Wang Xumn Li Hong-Tuo Wang Gui-Ling Zhou Lin Miao Qi-Lian Qin Ji-Hong Zhang State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of Zoology Chinese Academy of Sciences Beijing China Department of Herpetology Chengdu Institute of Biology Chinese Academy of Sciences Chengdu China

Ghost moths inhabiting the alpine meadows of the Tibetan Plateau are cold? adapted stenothermal organisms that are susceptible to heat (dead within 7 days at 27 °C exposure). Exploring the metabolic basis of their heat susceptibility would extend our understanding of the thermal biology of alpine-dwelling invertebrates. Here, gas chromatography-mass spectrometry-based metabolomics was combined with physiological and transcriptional approaches to determine the metabolic mechanisms of heat susceptibility in Thitarodes xiaojinensis larvae. The metabolomics results showed that 27 °C heat stress impaired the Krebs cycle and lipolysis in T. xiaojinensis larvae, as demonstrated by the accumulation of intermediary metabolites. In addition, carbohydrate reserves were highly and exclusively consumed, and an anaerobic product, lactate, accumulated. This evidence suggested a strong reliance on glycolysis to anaerobically generate energy. The respiration rate and enzymatic activity test results indicated a deficiency in O2 metabolism;in addition, the Krebs cycle capacity was not decreased, and the metabolic flux through aerobic pathways was limited. These findings were further supported by the occurrence of hypoxia symptoms in midgut mitochondria (vacuolation and swelling) and increased transcription of hypoxia-induced factor 1-α.Overall, heat stress caused O2 limitation and depressed the overall intensity of aerobic metabolism in ghost moths, and less efficient anaerobic glycolysis was activated to sustain their energy supply. As carbohydrates were depleted, the energy supply became deficient. Our study presents a comprehensive metabolic explanation for the heat susceptibility of ghost moths and reveals the relationship between O2 metabolism and heat susceptibility in these larvae.

关键词： energy metabolism ghost moths metabolomics thermal intolerance oxygen limitation respiration rate

Investigation of straightforward impedance eduction method on single-degree-of-freedom acoustic liners

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Chinese Journal of Aeronautics 2018年第12期31卷 2221-2233页

作者： Xianghai QIU Bo XIN long WU Yang meng Xiaodong JING Fluid and Acoustic Engineering Laboratory School of Energy and Power Engineering Beihang University

In order to address the current aircraft noise problem, the knowledge of impedance of acoustic liners subjected to high-intensity sound and grazing flow is of crucial importance to the design of high-efficiency acoustic nacelles. To this end, the present study is twofold. Firstly, the StraightForward impedance eduction Method(SFM) is evaluated by the strategy that the impedance of a liner specimen is firstly experimentally educed on a flow duct using the SFM, and then its accuracy is checked by comparing the numerical prediction with the measured wall sound pressure of the flow duct. Secondly, the effects of grazing flow and high-intensity sound on the impedance behavior of two single-layer liners are investigated based on comparisons between educed impedance and predictions by three impedance models. The performance of the SFM is validated by showing that the educed impedance leads to excellent agreement between the simulation and the measured wall sound pressure for different grazing flow Mach numbers and Sound Pressure Levels(SPLs) and over a frequency range from 3000 Hz down to 500 Hz. The grazing flow effect generally has the tendency that the acoustic resistance exhibits a slight decrease before it increases linearly with an increase in Mach,predicted successfully by the sound-vortex interaction theoretical model and the Kooi semi-empirical impedance model. However, the Goodrich semi-empirical impedance model gives only a simple linear relation of acoustic resistance starting from Mach zero. Additionally, when the SPL increases from 110 to 140 d B in the present investigation, the acoustic resistance exhibits a significant increase at all frequencies in the absence of flow; however, the resistance decreases slightly under a grazing flow of Mach 0.117. It indicates that the SPL effect can be greatly inhibited when flow is present,and the grazing flow effect can be reduced partly as well at a relatively high SPL.

关键词： Acoustic liner Experimental validation Grazing flow effect High sound intensity effect Impedance eduction Numerical evaluation Straightforward impedance eduction method

Adaptive Robust Motion Trajectory Tracking Control of Pneumatic Cylinders with LuGre Model-based Friction Compensation

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Chinese Journal of Mechanical Engineering 2014年第4期27卷 802-815页

作者： meng Deyuan TAO Guoliang LIU Hao zhu Xiaocong State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Department of Mechanical Engineering The Hong Kong Polytechnic University

Friction compensation is particularly important for motion trajectory tracking control of pneumatic cylinders at low speed movement. However, most of the existing model-based friction compensation schemes use simple classical models, which are not enough to address applications with high-accuracy position requirements. Furthermore, the friction force in the cylinder is time-varying, and there exist rather severe unmodelled dynamics and unknown disturbances in the pneumatic system. To deal with these problems effectively, an adaptive robust controller with LuGre model-based dynamic friction compensation is constructed. The proposed controller employs on-line recursive least squares estimation（RLSE） to reduce the extent of parametric uncertainties, and utilizes the sliding mode control method to attenuate the effects of parameter estimation errors, unmodelled dynamics and disturbances. In addition, in order to realize LuGre model-based friction compensation, the modified dual-observer structure for estimating immeasurable friction internal state is developed. Therefore, a prescribed motion tracking transient performance and final tracking accuracy can be guaranteed. Since the system model uncertainties are unmatched, the recursive backstepping design technology is applied. In order to solve the conflicts between the sliding mode control design and the adaptive control design, the projection mapping is used to condition the RLSE algorithm so that the parameter estimates are kept within a known bounded convex set. Finally, the proposed controller is tested for tracking sinusoidal trajectories and smooth square trajectory under different loads and sudden disturbance. The testing results demonstrate that the achievable performance of the proposed controller is excellent and is much better than most other studies in literature. Especially when a 0.5 Hz sinusoidal trajectory is tracked, the maximum tracking error is 0.96 mm and the average tracking error is 0.45 mm. This pa

关键词： servo-pneumatic system tracking control sliding mode control adaptive control LuGre model

Fano Resonance Effect in CO-Adsorbed Zigzag Graphene Nanoribbons

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Chinese Physics Letters 2017年第9期34卷 91-94页

作者： Gao Wang meng-Qiu long Dan Zhang Advanced Research Center Central South University Changsha 410083 Institute of Super Microstructure and Ultrafast Process Central South University Changsha 410083 School of Science Hunan University of Technology Zhuzhou 412007

Quantum interference plays an important role in tuning the transport property of nano-devices. Using the non- equilibrium Green＇s Function method in combination with density functional theory, we investigate the influence to the transport property of a CO molecule adsorbed on one edge of a zigzag graphene nanoribbon device. Our results show that the CO molecule-adsorbed zigzag graphene nanoribbon devices can exhibit the Fano resonance phenomenon. Moreover, the distance between CO molecules and zigzag graphene nanoribbons is closely related to the energy sites of the Fano resonance. Our theoretical analyses indicate that the Fano resonance would be attributed to the interaction between CO molecules and the edge of the zigzag graphene nanoribbon device, which results in the localization of electrons and significantly changes the transmission spectrum.

关键词： DOS Fano Resonance Effect in CO-Adsorbed Zigzag Graphene Nanoribbons CO

Embryonic array configuration optimization method based on reliability and hardware consumption

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Chinese Journal of Aeronautics 2019年第3期32卷 639-652页

作者： Tao WANG Jinyan CAI Yafeng meng Sai zhu Department of Electronic and Optical Engineering Army Engineering University

Embryonic Array(EA) with different configuration methods will directly affect its reliability and hardware consumption. At present, EA configuration design is lack of quantitative analysis method. In order to reasonably optimize EA configuration design, an EA configuration optimization design method is proposed, which is based on the constraints of EA hardware consumption and reliability. Through the analysis of EA working process and composition, quantitative analysis of EA reliability and hardware consumption are completed. Based on the constraints of EA hardware consumption and reliability, the mathematical model of EA configuration optimization design is established, which transfers EA configuration optimization design into an integer nonlinear programming model problem. According to the difference of the fitness value of individual waiting for mutation in population, adaptive mutation operator and crossover operator are selected, and a novel Modified Adaptive Differential Evolution(MADE) algorithm is proposed,which is used to solve EA configuration optimization design problem. Simulation experiments and analysis indicate that the MADE is able to effectively improve the speed, accuracy and stability of algorithm. Moreover, the proposed EA configuration optimization design method can select the most reasonable EA configuration design, and play an important guiding role in EA optimization design.

关键词： Configuration optimization Differential evolution Embryonic electronic Hardware consumption Integer nonlinear programming model Reliability Self-repairing

Effect of liming on sulfate transformation and sulfur gas emissions in degraded vegetable soil treated by reductive soil disinfestation

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Journal of Environmental Sciences 2015年第10期27卷 112-120页

作者： Tianzhu meng Tongbin zhu Jinbo Zhang Zucong Cai School of Geography Sciences Nanjing Normal University Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Key Laboratory of Virtual Geographic Environment (VGE) Ministry of EducationNanjing Normal University Jiangsu Key Laboratory of Environmental Change and Ecological Construction

Reductive soil disinfestation（RSD）, namely amending organic materials and mulching or flooding to create strong reductive status, has been widely applied to improve degraded ***, there is little information available about sulfate（SO4^2-） transformation and sulfur（S）gas emissions during RSD treatment to degraded vegetable soils, in which S is generally accumulated. To investigate the effects of liming on SO4^2-transformation and S gas emissions,two SO4^2--accumulated vegetable soils（denoted as S1 and S2） were treated by RSD, and RSD plus lime, denoted as RSD0 and RSD1, respectively. The results showed that RSD0 treatment reduced soil SO4^2-by 51% and 61% in S1 and S2, respectively. The disappeared SO4^2-was mainly transformed into the undissolved form. During RSD treatment, hydrogen sulfide（H2S）,carbonyl sulfide（COS）, and dimethyl sulfide（DMS） were detected, but the total S gas emission accounted for 〈 0.006% of total S in both soils. Compared to RSD0, lime addition stimulated the conversion of SO42-into undissolved form, reduced soil SO4^2-by 81% in S1 and 84% in S2 and reduced total S gas emissions by 32% in S1 and 57% in S2, respectively. In addition to H2S, COS and DMS, the emissions of carbon disulfide, methyl mercaptan, and dimethyl disulfide were also detected in RSD1 treatment. The results indicated that RSD was an effective method to remove SO4^2-, liming stimulates the conversion of dissolved SO4^2-into undissolved form,probably due to the precipitation with calcium.

关键词： Vegetable soil Reductive soil disinfestations Lime Sulfate Sulfur gases

The breeding of japonica rice in northern China: An 11-year study(2006–2016)

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Journal of Integrative Agriculture 2020年第8期19卷 1941-1946页

作者： CUI Yue zhu meng-meng XU Zheng-jin CHEN Wen-fu Rice Research Institute of Shenyang Agricultural University Shenyang 110866P.R.China

The world’s population is facing food shortages due to climate change and the competition for arable land between food and energy *** national and international projects to develop"super rice"cultivars were established in recent decades to attain a‘third leap forward’in rice *** order to evaluate the breeding process in northern China,an 11-year tracking survey of japonica rice breeding,which involved a total of 520 rice accessions and 67 test plots,was completed in this *** results showed that the yields of these accessions had increased stably,which was similar to control check varieties(CKs).The breeding strategy reduced the panicle number and increased the grain number per panicle through an increase of spikelet density(number of grains per centimeter on the panicle).This high spikelet density benefits not only the yield but also the blast resistance and amylose *** higher latitudes,the preferred rice accessions had slim grain shape and extended growth *** the middle latitudes among the test plots,the breeders focused on reducing the amylose content to improve the cooking quality of the rice *** and blast resistance were the two highest priorities during the breeding selection *** present study evaluated the breeding process in northern China during the last decade,which may lead to new insights into the future of rice breeding.

关键词： rice japonica breeding decade test northern China

Dust Condensation of SiC, SiO in Asymptotic Giant Branch Stellar Winds-SiC Spectrum

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Research in Astronomy and Astrophysics 2024年第5期24卷 13-20页

作者： Ruiqing Wu Chunhua zhu Guoliang Lu Shuming Yang Zhisen meng Xiaojiao Zhang Xizhen Lu Jinlong Yu Wujin Chen mengqiu long School of Physics and Electronics Central South UniversityChangsha 410083China School of Physical Science and Technology Xinjiang UniversityUrumqi 830046China School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China School of Microelectronics and Physics Hunan University of Technology and BusinessChangsha 410205China College of Mechanical and Electronic Engineering Tarim UniversityAlar 843300China School of Medicine Xinjiang Medical UniversityUrumqi 830011China

We have chosen the Large Scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) code to calculate the coalescence of silicon carbide (SiC),silicon oxide dust (SiO) in the AGB stellar *** is a classica molecular dynamics simulation *** the same time,we consider the effect of temperature on the evolution of molecular *** also calculated the temperature change of non-spherical SiC,SiO dust *** condensation temperature range of SiC dust in the AGB stellar wind is[300–500]k and[900–1100]k for SiO Finally,the infrared spectrum of SiC was calculated using Gaussian 16 *** 77SiC,70Si_(3)C_(3),and 121Si_(3)C_(3) models have clear characteristic peaks of infrared spectra responding at 5,8.6,11.3,15,19,and 37μm.

关键词： stars AGB and post-AGB infrared ISM-(ISM:)dust-extinction

The Emergence of Functional Ultrasound for Noninvasive Brain-Computer Interface

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Research 2024年第2期6卷 301-317页

作者： Hairong Zheng Lili Niu Weibao Qiu Dong Liang Xiaojing long Guanglin Li Zhiyuan Liu long meng Institute of Biomedical and Health Engineering Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen518055China Shenzhen Institute of Advanced Integration Technology Chinese Academy of Sciences and The Chinese University of Hong KongShenzhen518055China

A noninvasive brain-computer interface is a central task in the comprehensive analysis and understanding of the brain and is an important challenge in international brain-science *** implanted brain-computer interfaces are cranial and invasive,which considerably limits their *** development of new noninvasive reading and writing technologies will advance substantial innovations and breakthroughs in the field of brain-computer ***,we review the theory and development of the ultrasound brain functional imaging and its ***,we introduce latest advancements in ultrasound brain modulation and its applications in rodents,primates,and human;its mechanism and closed-loop ultrasound neuromodulation based on electroencephalograph are also ***,high-frequency acoustic noninvasive brain-computer interface is prospected based on ultrasound super-resolution imaging and acoustic tweezers.

关键词： breakthrough computer Computer