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Artificial synthesis of polyesters at ambient condition via consecutive CO_(2)electrolysis and fermentation

Nano Research 2024年第7期17卷 6016-6025页

作者： Guiru Zhang Ning Ji shiheng lyu Baoxin Ni Peng Shen Ke Ye Yuting Wang Xuheng Jiang Hai Zhang Xi Liu Yongcheng Wang Kun Jiang Department of Laboratory Medicine of The First Affiliated Hospital&Liangzhu Laboratory Zhejiang University School of MedicineHangzhou 310058China Interdisciplinary Research Center School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China In-situ Centre for Physical Sciences Frontiers Science Center for Transformative MoleculesSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Electrochemically converting CO_(2)into value-added chemicals is a promising approach to mitigate anthropogenic carbon emissions,yet largely limited to short-chained C_(1)–C_(3)***,we demonstrate a tandem artificial synthesis of biodegradable polyhydroxybutyrate(PHB)plastic from CO_(2)building *** synthesis of defects-enriched Bi catalyst is firstly demonstrated by plasma bombardment and following in situ electrochemical reduction,which delivers a HCOOH Faradaic efficiency above 80%at tunable concentration from 2 to 250 mM,an energy efficiency up to 41%,and a single-pass carbon conversion efficiency up to 60%.Annular dark field and second electron microscopic analysis,density functional theory(DFT)calcualtions,coupled with H-type and solid-state electrolyzer assessments,point out the vital role of defective and/or stepped Bi surface sites in promoting CO_(2)-to-HCOOH ***,as-synthesized high-purity HCOOH is used as the sole carbon source for C-chain growth within microbial fermentation reactor with Ralstonia eutropha,where activated formate dehydrogenase and increased metabolites related to Calvin–Benson–Bassham cycle are found to be responsible for the enhanced polyester accumulation.

关键词： CO_(2)electrolysis Bi catalyst vacancy site formic acid fermentation

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A deep Q-learning model for sequential task offloading in edge AI systems

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Intelligent and Converged Networks 2024年第3期5卷 207-221页

作者： Dong Liu shiheng Gu Xinyu Fan Xu Zheng Department of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610000China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 515100China Department of Information and Software Engineering University of Electronic Science and Technology of ChinaChengdu 610000China

Currently,edge Artificial Intelligence(AI)systems have significantly facilitated the functionalities of intelligent devices such as smartphones and smart cars,and supported diverse applications and *** fundamental supports come from continuous data analysis and computation over these *** the resource constraints of terminal devices,multi-layer edge artificial intelligence systems improve the overall computing power of the system by scheduling computing tasks to edge and cloud servers for *** efforts tend to ignore the nature of strong pipelined characteristics of processing tasks in edge AI systems,such as the encryption,decryption and consensus algorithm supporting the implementation of Blockchain ***,this paper proposes a new pipelined task scheduling algorithm(referred to as PTS-RDQN),which utilizes the system representation ability of deep reinforcement learning and integrates multiple dimensional information to achieve global task ***,a co-optimization strategy based on Rainbow Deep Q-Learning(RainbowDQN)is proposed to allocate computation tasks for mobile devices,edge and cloud servers,which is able to comprehensively consider the balance of task turnaround time,link quality,and other factors,thus effectively improving system performance and user *** addition,a task scheduling strategy based on PTS-RDQN is proposed,which is capable of realizing dynamic task allocation according to device *** results based on many simulation experiments show that the proposed method can effectively improve the resource utilization,and provide an effective task scheduling strategy for the edge computing system with cloud-edge-end architecture.

关键词： edge computing task scheduling reinforcement learning Rainbow Deep Q-Learning(RainbowDQN)

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Functional assessment of cadherin as a shared mechanism for cross/dual resistance to Cry1Ac and Cry2Ab in Helicoverpa zea

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Journal of Integrative Agriculture 2024年第5期23卷 1604-1617页

作者： Jizhen Wei Min Zhang Pin Li Zhongyuan Deng Xinming Yin shiheng An Xianchun Li State Key Laboratory of Wheat and Maize Crop Science/College of Plant Protection Henan Agricultural UniversityZhengzhou 450046China Department of Entomology and BIO5 Institute University of ArizonaTucsonAZ 85721USA School of Agricultural Sciences Zhengzhou UniversityZhengzhou 450001China

Helicoverpa zea is a major target pest of pyramided transgenic crops expressing Cry1,Cry2 and/or Vip3Aa proteins from Bacillus thuringiensis(Bt)in the United ***-selected Cry1Ac/Cry2Ab cross resistance and fieldevolved practical dual resistance of *** to these two toxins have been widely *** the widespread Cry1Ac/Cy2Ab dual resistance of *** has resulted from the selection of one shared or two independent resistance mechanisms by pyramided Bt crops remains *** is a well-confirmed receptor of Cry1Ac and a suggested receptor of Cry2Ab in at least three Lepidopteran *** test whether cadherin may serve as one shared mechanism for the cross and dual resistance of *** to Cry1Ac and Cry2Ab,we cloned *** cadherin(HzCadherin)cDNA and studied its functional roles in the mode of action of Cry1Ac and Cry2Ab by gain-and lossof-function *** expression of HzCadherin in *** midgut,*** fat body and Sf9 cells made all three of these cell lines more susceptible to activated Cry1Ac but not activated Cry2Ab,whereas silencing HzCadherin of *** midgut and fat body cells significantly reduced the susceptibility to Cry1Ac but not ***,suppressing HzCadherin with siRNA made *** larvae resistant to *** results clearly demonstrate that HzCadherin is not a receptor for Cry2Ab,and thus it is unlikely to serve as one shared mechanism for the cross and dual resistance of *** to Cry1Ac and Cry2Ab.

关键词： Bt crops cadherin Cry toxin receptor resistance mechanism

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Spin-orbit torque effect in silicon-based sputtered Mn_(3)Sn film

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Chinese Physics B 2024年第10期33卷 394-399页

作者： Sha Lu Dequan Meng Adnan Khan Ziao Wang Shiwei Chen shiheng Liang School of Physics Hubei UniversityWuhan 430062China Key Laboratory for Intelligent Sensing System and Security of Ministry of Education Wuhan 430062China

Noncollinear antiferromagnet Mn_(3)Sn has shown remarkable efficiency in charge-spin conversion,a novel magnetic spin Hall effect,and a stable topological antiferromagnetic state,which has resulted in great interest from researchers in the field of spin-orbit *** research has primarily focused on the spin-orbit torque effect of epitaxially grown noncollinear antiferromagnet Mn_(3)Sn ***,this method is not suitable for large-scale industrial *** this study,amorphous Mn_(3)Sn films and Mn_(3)Sn/Py heterostructures were prepared using magnetron sputtering on silicon *** spin-torque ferromagnetic resonance measurement demonstrated that only the conventional spin-orbit torque effect generated by in-plane polarized spin currents existed in the Mn_(3)Sn/Py heterostructure,with a spin-orbit torque efficiency of ***,we prepared the perpendicular magnetized Mn_(3)Sn/CoTb heterostructure based on amorphous Mn_(3)Sn film,where the spin-orbit torque driven perpendicular magnetization switching was achieved with a lower critical switching current density(3.9×10^(7)A/cm^(2))compared to Ta/CoTb *** research reveals the spin-orbit torque effect of amorphous Mn_(3)Sn films and establishes a foundation for further advancement in the practical application of Mn_(3)Sn materials in spintronic devices.

关键词： spintronics noncollinear antiferromagnetism spin-orbit torque

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The Ca^(2+)/CaN/ACC and cAMP/PKA/HK signal pathways are required for PBAN-mediated sex pheromone biosynthesis in Conogethes punctiferalis

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Journal of Integrative Agriculture 2024年第8期23卷 2735-2751页

作者： Yao Zhang Zelong She Ruolan He Shuangyan Yao Xiang Li Xiaoguang Liu Xinming Yin Jizhen Wei Mengfang Du shiheng An State Key Laboratory of Wheat and Maize Crop Science/Henan International Laboratory for Green Pest Control/College of Plant Protection Henan Agricultural UniversityZhengzhou 450046China

Conogethes punctiferalis is a crop and fruit pest that has caused serious economic losses to agricultural *** pest relies heavily on its sex pheromone to ensure sexual encounters and subsequent mating ***,the molecular mechanism underlying sex pheromone biosynthesis in this species remains *** present study investigated the detailed mechanism underlying PBAN-regulated sex pheromone biosynthesis in *** by transcriptome sequencing of the *** pheromone glands(PGs)and subsequent functional identification of the target *** results showed that female mating started from the first scotophase,and peaked at the second to fifth scotophases in accordance with the release of sex *** regulated sex pheromone biosynthesis by employing Ca^(2+)and cAMP as secondary messengers,as demonstrated by RNA interference(RNAi),pharmacological inhibitors,and behavioral *** investigation revealed that calcineurin(CaN)and acetyl-CoA carboxylase(ACC)were activated by PBAN/Ca^(2+)signaling,and the RNAimediated knockdown of CaN and ACC transcripts significantly reduced sex pheromone production,ultimately leading to a significantly reduced ability of females to attract ***,hexokinase(HK)was found to regulate sex pheromone biosynthesis in response to the PBAN/cAMP/PKA signaling pathway,as demonstrated by RNAi,enzyme activity,and pharmacological inhibitor ***,Far2 and Desaturase1 were found to participate in PBAN-regulated sex pheromone ***,our findings revealed that PBAN regulates sex pheromone biosynthesis through the PBANR/Ca^(2+)/CaN/ACC and PBANR/cAMP/PKA/HK pathways in ***,which enriches our comprehension of the details of sex pheromone biosynthesis in moths.

关键词： Conogethes punctiferalis sex pheromone cAMP/PKA calcineurin acetyl-CoA carboxylase hexokinase

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Gravesoil fungi are more sensitive than bacteria in response to precipitation

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Soil Ecology Letters 2024年第3期6卷 71-83页

作者： Binghua Han Xueying Gan Shunqin Shi Xueqian Hu Xianxian Mu Qiaoling Yu shiheng Zhang Huan Li Institute of Microbiome Frontiers and One Health School of Public HealthLanzhou UniversityLanzhou 730000China State Key Laboratory of Grassland Agro-ecosystems Center for Grassland MicrobiomeLanzhou UniversityLanzhou 730000China Chongqing Key Laboratory of Development and Utilization of Genuine Medicinal Materials in Three Gorges Reservoir Area Faculty of Basic Medical SciencesChongqing Three Gorges Medical CollegeWanzhou 404120China Affiliated Peopleʼs Hospital of Chongqing Three Gorges Medical College Wanzhou 404120China

Precipitation scenario alteration leads to grievous ecological consequences in ecosystems,especially on the Qinghai-Tibet *** and fungal community and their abundant and rare taxa in soil ecosystems may respond differently to the changed ***,more attention needs to be paid to the sensitivity of bacteria and fungi and their abundant and rare taxa to precipitation *** responses of bacterial and fungal populations and their abundant and rare taxa concerning diversity,assembly,and interactions to manipulative changes of precipitation were explored via imitating no precipitation,little precipitation,and medium precipitation using 16S rRNA gene and ITS amplicon *** results indicated that the change rate of fungal Simpson diversity with precipitation was higher than that of *** slope of the modified stochasticity ratio(MST)value of fungi to precipitation was steeper than that of *** Simpson diversity and the MST value of abundant and rare taxa within bacteria had no difference with *** contrast,those of abundant taxa within fungi varied more than rare ones with *** unveiling the differential responses of microbial populations with discrepant characteristics,this study allowed us to understand the different microbial communities responding to rainfall on the Qinghai-Tibet Plateau.

关键词： Qinghai-Tibet Plateau sensitivity precipitation assembly co-occurrence networks

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Multivariate relationships between microstructure evolution and strengthening mechanisms in laser powder bed fusion of Al-Mn-Sc alloy:towards improved fatigue performance

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Light(Advanced Manufacturing) 2024年第1期5卷 3-18页

作者： Huaping Tang Chaofeng Gao shiheng Zhang Xiaojing Xiong Sheng Cao Xiaopeng Wu Yunjie Bi Jeremy Heng Rao Institute of Advanced Additive Manufacturing Ji Hua LaboratoryFoshanGuangdong528200China Department of Mechanical Engineering College of EngineeringShantou UniversityShantouGuangdong515063China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

The effects of direct aging treatment(at 300°C for 5 hours)on selective laser melted(SLMed)Al-4.5Mn-1.5Mg-0.9Sc-0.2Zr alloy were investigated in this work,with the microstructure,fatigue behaviors,and fracture characteristics examined to determine the primary cause of fatigue crack *** results revealed that the microstructure of the investigated alloy comprised fine equiaxed and columnar *** aging treatment,a significant number of nano-scaled Al3(Sc,Zr)precipitates were dispersed within the grains,leading to a substantial increase in *** yield strength improved from 431 MPa to 568 MPa,representing an increase of more than 32%,while the fatigue strength improved from 180 MPa to 220 MPa after aging ***,the fracture toughness decreased significantly from 25.1 MPa·√m to 12.3 MPa·√*** results of the fatigue fracture characteristics indicate that the Mn-rich phase and the formation of defects such as pores and poor powder fusion are the sources of fatigue *** direct aging treatment can significantly increase the yield strength,decrease the rate of fatigue crack propagation,and thus improve the fatigue performance,it deteriorates the fracture toughness,and thus shortens the fatigue life of the alloy as well.

关键词： Selective laser melting Al-Mn-Sc alloys High-cycle fatigue

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星轮支承刚度对两级星型齿轮传动系统均载特性的影响

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机械制造与自动化 2021年第6期50卷 25-28页

作者：吕世恒李政民卿南京航空航天大学机电学院江苏南京210016

为揭示两级星型齿轮传动系统星轮载荷分配机理,提高星型齿轮传动系统承载能力,提出双联齿轮弯扭耦合振动边界条件,建立考虑双联星轮横向振动的弯扭耦合动力学模型,研究星轮支承刚度对系统均载特性的影响规律。研究结果表明:考虑星轮横... 详细信息

为揭示两级星型齿轮传动系统星轮载荷分配机理,提高星型齿轮传动系统承载能力,提出双联齿轮弯扭耦合振动边界条件,建立考虑双联星轮横向振动的弯扭耦合动力学模型,研究星轮支承刚度对系统均载特性的影响规律。研究结果表明:考虑星轮横向振动的均载分析模型消除了星轮支承刚度足够大的假设,与实际模型更接近;减小星轮支承刚度可以明显改善系统均载性能,且星轮2支承刚度的影响大于星轮3。

关键词：两级星型齿轮弯扭耦合动力学模型星轮支承刚度均载

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中国对“一带一路”沿线国家OFDI的绿色生产率增长效应——基于吸收能力和制度环境的实证检验

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经济问题探索 2024年第1期 121-137页

作者：李史恒屈小娥西安交通大学经济与金融学院西安710061

文章基于吸收能力和制度环境视角,实证检验了对“一带一路”沿线国家和地区对外直接投资(OFDI)的母国绿色生产率增长效应。结果表明:(1)社会资本存在“双重门槛”效应,产业集聚存在“单一门槛”效应,创新能力存在“三重门槛”效应。社... 详细信息

文章基于吸收能力和制度环境视角,实证检验了对“一带一路”沿线国家和地区对外直接投资(OFDI)的母国绿色生产率增长效应。结果表明:(1)社会资本存在“双重门槛”效应,产业集聚存在“单一门槛”效应,创新能力存在“三重门槛”效应。社会资本和产业集聚门槛下,OFDI对绿色生产率的影响呈正向边际效应递增的非线性特征,越过产业集聚门槛的主要以少数东部省市为主。创新能力门槛下,OFDI与绿色生产率之间呈“U型”关系,目前只有少数东部省市越过门槛值。(2)政府参与度存在“双重门槛”效应,该门槛下OFDI与绿色生产率之间呈“倒N型”关系,即政府适度参与有利于发挥OFDI逆向溢出效应,但过度参与和参与不足则会起反作用,这些省份主要集中在中西部地区。环境规制存在“单一门槛”效应,环境规制跨过一定的门槛值后OFDI的正向效应才变得显著,目前越过门槛值的只有少数东部省市。

关键词： OFDI 绿色生产率吸收能力制度环境门槛效应

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创新驱动绿色经济增长的理论分析与实证检验

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统计与信息论坛 2024年第7期39卷 29-41页

作者：李史恒屈小娥西安交通大学经济与金融学院陕西西安710061

为了研究创新如何赋能绿色经济增长,首先从理论上解析了创新驱动绿色经济增长的直接作用机制和传导机制,提出研究假说;其次构建直接效应模型和中介效应模型,运用2005—2020年中国省级面板数据实证检验理论假说。研究发现创新驱动存在正... 详细信息

为了研究创新如何赋能绿色经济增长,首先从理论上解析了创新驱动绿色经济增长的直接作用机制和传导机制,提出研究假说;其次构建直接效应模型和中介效应模型,运用2005—2020年中国省级面板数据实证检验理论假说。研究发现创新驱动存在正向赋能绿色经济增长的直接效应,并且创新驱动绿色经济增长的正向赋能在经济发展水平较高的地区作用效果更强。创新也能够通过人力资本、产业升级、金融发展和政府干预等中介传导机制间接赋能绿色经济增长。各中介变量作用强度按照“人力资本>产业升级>政府中介>金融发展”的大小排序,人力资本的中介作用最为强劲,金融发展作用强度最小。为了更好地实现创新驱动绿色经济增长,不仅应积极发挥创新驱动的直接赋能效应,还应该高度重视各种间接赋能机制。

关键词：绿色经济增长创新驱动赋能机制中介效应

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