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Contribution of fungal biomass to persistent soil carbon across natural ecosystems

Science China Earth Sciences 2025年

作者： Xiang WANG Guang-Hui YU Yakov KUZYAKOV bo-hao YIN Andreas KAPPLER Cong-Qiang LIU bohai Coastal Critical Zone National Observation and Research Station Institute of Surface-Earth System Science School of Earth System Science Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim Tianjin University Department of Soil Science of Temperate Ecosystems Department of Agricultural Soil Science University of G?ttingen Agro-Technological Institute Peoples Friendship University of Russia (RUDN University) Geomicrobiology Center for Applied Geosciences University of Tübingen Cluster of Excellence EXC 2124 Controlling Microbes to Fight Infection University of Tübingen

Fungi are known to be crucial in the formation and stabilization of soil organic matter through their exudates and dead residues (necromass). Yet, it remains unclear how fungi contribute to the persistence of carbon in soils over millennial scales across biomes. Here, this study fills the knowledge gap by linking fungal carbon stocks with minerals-associated carbon stocks across major biomes. A strong correlation between fungal biomass and reactive mineral-associated carbon stocks in soils across six biomes supports the substantial role of fungi in soil carbon persistence at the global level. High spatial resolution nanoscale secondary ion mass spectrometry revealed that fungi may stabilize carbon by forming organo-mineral associations through their close physical connection to reactive minerals and weathered nanoparticles. We propose a conceptual model that emphasizes the dualistic role of hypha-mineral interactions:(i) fungi accelerate organic matter decomposition by producing reactive oxygen species on the hypha-mineral interfaces, and (ii) fungi stabilize their residues on mineral surfaces, leading to millennial scale persistence of soil C. Concluding, fungi play a fundamental role in ecosystems that extends beyond the decomposition of persistent carbon. They are crucial in stabilizing carbon on mineral surfaces, thereby facilitating the long-term removal of carbon from rapid biotic cycling.

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等离子体改性聚酰亚胺热老化的分子模拟

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原子与分子物理学报 2025年第1期42卷 95-100页

作者：丁璨田浩博陈琛三峡大学电气与新能源学院宜昌443002

通过反应分子动力学方法模拟聚酰亚胺的热老化过程,以模拟仿真等离子体改性后的聚酰亚胺材料在热裂解后的性能变化情况.通过研究老化过程中气体产生的情况,研究发现随着温度升高,分子链之间的相互作用力减弱,导致材料的致密性下降,弹性... 详细信息

通过反应分子动力学方法模拟聚酰亚胺的热老化过程,以模拟仿真等离子体改性后的聚酰亚胺材料在热裂解后的性能变化情况.通过研究老化过程中气体产生的情况,研究发现随着温度升高,分子链之间的相互作用力减弱,导致材料的致密性下降,弹性模量降低,材料抵抗外应力的能力减弱.同时,由于温度升高使得聚酰亚胺材料相对介电常数上升,材料绝缘性能下降,击穿强度也被削弱.

关键词：反应分子动力学聚酰亚胺热老化

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Multiconditional machining process quality prediction using deep transfer learning network

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Advances in Manufacturing 2023年第2期11卷 329-341页

作者： bo-hao Li Li-Ping Zhao Yi-Yong Yao State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong UniversityXi'an710049People's Republic of China School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an710049People's Republic of China

The quality prediction of machining processes is essential for maintaining process stability and improving component quality. The prediction accuracy of conventional methods relies on a significant amount of process signals under the same operating conditions. However, obtaining sufficient data during the machining process is difficult under most operating conditions, and conventional prediction methods require a certain amount of training data. Herein, a new multiconditional machining quality prediction model based on a deep transfer learning network is proposed. A process quality prediction model is built under multiple operating conditions. A deep convolutional neural network (CNN) is used to investigate the connections between multidimensional process signals and quality under source operating conditions. Three strategies, namely structure transfer, parameter transfer, and weight transfer, are used to transfer the trained CNN network to the target operating conditions. The machining quality prediction model predicts the machining quality of the target operating conditions using limited data. A multiconditional forging process is designed to validate the effectiveness of the proposed method. Compared with other data-driven methods, the proposed deep transfer learning network offers enhanced performance in terms of prediction accuracy under different conditions.

关键词： Multiconditional machining process Intelligent manufacturing Deep transfer learning Quality prediction Process stability

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A novel predict-prevention quality control method of multi-stage manufacturing process towards zero defect manufacturing

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Advances in Manufacturing 2023年第2期11卷 280-294页

作者： Li-Ping Zhao bo-hao Li Yi-Yong Yao State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong UniversityXi'an710049People's Republic of China School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an710049People's Republic of China

Zero defection manufacturing (ZDM) is the pursuit of the manufacturing industry. However, there is a lack of the implementation method of ZDM in the multi-stage manufacturing process (MMP). Implementing ZDM and controlling product quality in MMP remains an urgent problem in intelligent manufacturing. A novel predict-prevention quality control method in MMP towards ZDM is proposed, including quality characteristics monitoring, key quality characteristics prediction, and assembly quality optimization. The stability of the quality characteristics is detected by analyzing the distribution of quality characteristics. By considering the correlations between different quality characteristics, a deep supervised long-short term memory (SLSTM) prediction network is built for time series prediction of quality characteristics. A long-short term memory-genetic algorithm (LSTM-GA) network is proposed to optimize the assembly quality. By utilizing the proposed quality control method in MMP, unqualified products can be avoided, and ZDM of MMP is implemented. Extensive empirical evaluations on the MMP of compressors validate the applicability and practicability of the proposed method.

关键词： Zero defection manufacturing(ZDM) Multi-stage manufacturing process(MMP) Moving window Deep supervised long-short term memory(SLSTM)network Assembly quality optimization

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Investigation of Anticorrosive Performance of Oil-infused Slippery and Superhydrophobic Brass Surfaces by Laser Texturing

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Journal of Bionic Engineering 2021年第5期18卷 1157-1167页

作者： Li Zhang Chong Zhang Jingrong Tang bo hao Mingyang Wang Key Laboratory of Vibration and Control of Aeronautical Power Equipment of Ministry of Education Northeastern University at QinhuangdaoQinhuangdao 066004China

Brass is widely used in machinery,electronic appliances and emerging *** corrosion resistance of laser-induced superhydrophobic surface of brass needs to be *** recent years,bionic surface with slippery coating has attracted much attention because of its excellent corrosion inhibition ***,we first prepared the superhydrophobic surface of brass by nanosecond laser ablation combined with fluoroalkyl silane modification,and then injected silicone oil into the prepared superhydrophobic matrix to obtain a slippery coating *** and EIS tests in 3.5 wt.%NaCl solution showed that the corrosion resistance of the slippery surface was better than that of the superhydrophobic *** study can play a certain role in promoting the development of metal anticorrosive coating and is of great significance in the preparation of slippery surface by laser induction,and provides a convenient and eff ective means for metal anticorrosion in the industrial field.

关键词： Nanosecond laser Superhydrophobic Slippery surface Corrosion resistance

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Dissipation-Driven Superradiant Phase Transition of a Two-Dimensional bose-Einstein Condensate in a Double Cavity

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Chinese Physics Letters 2024年第6期41卷 44-48页

作者： bo-hao Wu Xin-Xin Yang Yu Chen Wei Zhang Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Graduate School of China Academy of Engineering Physics Beijing 100193China Beijing Academy of Quantum Information Sciences Beijing 100193China

We study superradiant phase transitions in a hybrid system of a two-dimensional bose–Einstein condensate of atoms and two cavities arranged with a tilt *** adjusting the loss rate of cavities,we map out the phase diagram of steady states within a mean field *** is found that when the loss rates of the two cavities are different,superradiant transitions may not occur at the same time in the two cavities.A first-order phase transition is observed between the states with only one cavity in superradiance and both in *** the case that both cavities are superradiant,a net photon current is observed flowing from the cavity with small decay rate to the one with large decay *** photon current shows a non-monotonic dependence on the loss rate difference,owing to the competition of photon number difference and cavity field phase *** findings can be realized and detected in experiments.

关键词： Einstein transitions decay

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Effects of aging treatment processes on microstructures and mechanical properties of AZ63 casting magnesium alloy

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China Foundry 2023年第4期20卷 307-314页

作者： Chun-yu Li hao-bo Wei Shi-hui Ruan Jie-yi Chen Zong-gang Wu Ming-bo Yang Materials Science&Engineering College Chongqing University of TechnologyChongqing 400050China

The effects of three different aging treatment processes,namely single-stage,double-stage,and reverse double-stage aging treatment processes,on the microstructures and mechanical properties of the AZ63(Mg-6Al-3Zn-0.25Mn)casting magnesium alloy were investigated and *** results indicate that the microstructures of all the aged alloys under the three treatment processes are mainly composed ofα-Mg,Mg17Al12),and Al4Mn phases,indicating that the double-stage and reverse double-stage aging treatments have no obvious effect on the type of alloy ***,as compared with the single-stage and double-stage processes,the reverse double-stage process has a great effect on the quantity of the *** the reverse double-stage aging treatment,which results in a stronger drive for decomposition of the supersaturated solid solution,the number of Mg17Al12phases precipitated in the grains significantly *** addition,as compared with the single-stage aged alloy,the tensile properties at room temperature for both the double-stage and reverse double-stage aged alloys are significantly *** them,the reverse double-stage aged alloy achieves the highest tensile strength,yield strength,and elongation of 295 MPa,167 MPa,and 8.6%,respectively.

关键词： magnesium alloys Mg-Al based alloys AZ63 alloy heat treatment aging treatment

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Micro-segregation and Precipitation of Alloy 690 during Isothermal Solidification:the Role of Nitrogen Content

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Journal of Materials Science & Technology 2012年第5期28卷 446-452页

作者： Rong Jiang bo Chen Xianchao hao Yingche Ma Shuo Li Kui Liu Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The segregation and precipitation behavior of Alloy 690 containing 0.001-0.11 wt% nitrogen during isothermal solidification at 1370 and 1355 ℃ have been investigated using optical microscopy （OM）,electron probe microanalysis （EPMA） and transmission electron microscopy （TEM）.The results indicate that the volume fraction of TiN-type nitride formed during isothermal solidification increases with the nitrogen content of Alloy *** of Ti and Cr exists in samples solidified at 1370 and 1355℃.The Ti content in the residual liquid markedly decreases and the concentration of Cr increases when the nitrogen content of Alloy 690 ***,N and S also show segregation to some extent in the residual liquids at 1355℃.Accompanying by the segregation of Cr,Ti,C,N and S,sulfides and chromium nitrides *** a low nitrogen content Alloy 690,sulfur segregates and precipitates in the form of Ti 4 C 2 S 2 and （Cr,Ti）S,but in the form of （Cr,Ti）S or CrS in a high nitrogen content Alloy 690.（Cr,Ti）N-type nitrides with an fcc crystal structure have been identified in a sample with 0.11 wt% nitrogen.

关键词： Alloy 690 Nitrogen content Solidification Micro-segregation Precipitate

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Effect of Degree-of-Symmetry on Kinetostatic Characteristics of Flexure Mechanisms:A Comparative Case Study

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Chinese Journal of Mechanical Engineering 2018年第2期31卷 54-65页

作者： Xiao-Bing He Jing-Jun Yu Wan-Wan Zhang Guang-bo hao School of Mechanical Engineering and Automation Beihang University School of Engineering-Electrical and Electronic Engineering University College Cork

The current research of kinetostatic characteristics in flexure mechanisms mainly focus on the improvement of accuracy. To reduce or eliminate the parasitic motion is considered as an approach by using the common knowledge of symmetry. However, there is no study on designing the flexure mechanisms with symmetrical features as many as possible for better kinetostatic performance, when considering the resulting cost by the symmetry. In this paper, the concept of degree of symmetry(DoS) is proposed for the first time, which is committed to symmetry design in the phase of conceptual design. A class of flexure mechanisms with 0?DoS, 1?DoS, 2?DoS and 3?DoS are synthesized respectively based on the Freedom and Constraint Topology method. Their overall compliance matrices in an analytical form formulated within the framework of the screw theory are used to analyze and compare the effect of different number of DoS on the kinetostatic characteristics for flexure mechanisms. The finite element analysis(FEA) simulations are implemented to verify the analytical results. These results show that the higher the DoS is, the smaller the parasitic motion error will be. The flexure model with 3?DoS is optimized according to the overall compliance matrix and then tested by using the FEA simulation. The testing result shows that with the best combination parameters, the parasitic motion error for 3?DoS mechanism is almost eliminated. This research introduces a design principle which can alleviate the unwanted parasitic motion for better accuracy.

关键词： Flexure mechanism Symmetry Kinetostatic characteristics FEA simulation

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Synthesis of Hydroxy-functionalized Ultrahigh Molecular Weight Polyethylene Using Fluorenylamidotitanium Complex

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Chinese Journal of Polymer Science 2018年第2期36卷 171-175页

作者： Xiang-Yang Song Qiong Ma hao-bo Yuan Zheng-Guo Cai State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University

Copolymerizations of ethylene and 1-dodecene were conducted with a series of ansa-fluorenylamidodimethyltitanium complexes, [t-BuNSiMe2Flu]TiMe2（1a）, [t-BuNSiMe2（2,7-^tBu2Flu）]TiMe2（1 b）, and [（1-adamantyl）NSiMe2（2,7-^tBu2Flu）]TiMe2（1c） activated by modified methylaluminoxane. The activity increased by the introduction of the alkyl groups on the fluorenyl and amido ligands, and 1c produced the highest molecular weight copolymers. Complex 1c also promoted copolymerization of ethylene and ^iBu3 Al protected 10-undecen-1-ol with high activity（～2000 kg·mol^-1·h^-1）, affording hydroxy-functionalized ultrahigh molecular weight polyethylene. The hydroxy content of the copolymers obtained was controllable by changing comonomer feed ratio. The introduction of a small amount of hydroxy group can alter the surface properties of polyethylene.

关键词： Single-site catalyst Ethylene Polar monomer Copolymerization Hydroxy-functionalized polyethylene

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