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Co-incorporation of Chinese milk vetch(Astragalus sinicus L.)and chemical fertilizers alters microbial functional genes supporting short-time scale positive nitrogen priming effects in paddy soils

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Pedosphere 2024年第3期34卷 567-576页

作者： Limin WANG Chunmei HE Dongfeng huang Juhua YU Cailing LIU Qinghua LI Yibin huang Juan LI Fei WANG Institute of Resources Environment and Soil FertilizerSoil and Fertilizer InstituteFujian Academy of Agricultural SciencesFuzhou 350012(China) School of Resources and Environment Engineering Anhui UniversityHefei 230601(China)

Nitrogen(N)priming is a microbially mediated biochemical process as affected by different incorporation ***,little information is known about the microbial mechanisms driving the response of N priming to co-operation of Chinese milk vetch(CMV,Astragalus sinicus L.)and different rates of chemical fertilizers in paddy soils in South ***,an anaerobic incubation experiment was conducted to study N priming effects(PE)and their relationships with soil microbial functional genes after CMV incorporation alone(M),co-incorporation of CMV with 100%(normal dosage)chemical fertilizers(MC100),and co-incorporation of CMV with 80% chemical fertilizers(MC80).Co-incorporation of CMV and chemical fertilizers enhanced the short-time scale(the first 20 d of incubation)positive PE of N,while no significant differences existed among the three treatments on day 60 or 90 of incubation(P>0.05).Compared with the M treatment,gross priming effect(GPE)in the MC100 and MC80 treatments significantly increased by 34.0% and 31.3%,respectively,and net priming effect(NPE)increased by 47.7% and 47.8%,respectively,during the first 20 d of incubation(P<0.05).This was likely attributed to soil nutrient availability and added substrate *** MC100 and MC80 treatments increased the gdhA gene abundance by 5.0% and 9.8%,increased the gdh2 gene abundance by 12.7% and 45.7%,and increased the nasB gene abundance by 9.5% and 41.4%,respectively,in comparison with the M treatment on day 20 of *** analyses indicated that soil microbial functional genes involved in N mineralization(gdhA and gdh2),assimilatory nitrate reduction(nasB),and nitrification(amoB)were significantly correlated with N priming under different incorporation practices during the incubation period(P<0.05).Thus,co-incorporation of CMV and chemical fertilizers can regulate soil microbial community functional gene structure,which may accelerate mineralization and assimilatory nitrate reduction and inhibit

关键词： green manure gross priming effect incorporation practice microbial mechanism net priming effect rice field soil

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Transient Current Estimation of MMC-HVDC Systems Under a Grid-converter Phase Difference

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 730-743页

作者： Yushuang Liu Meng huang Xiaoming Zha Herbert Ho-Ching Iu School of Electrical Engineering and Automation Wuhan UniversityWuhanChina School of Electrical Electronic and Computer EngineeringThe University of Western AustraliaWestern AustraliaAustralia

When a modular multilevel converter based high voltage direct current(MMC-HVDC)system operates under grid faults,there will be a phase difference between the grid voltage and the converter *** can be caused by grid voltage phase shifting and the integration effect of the phase-locked loop(PLL)in the *** system may exhibit an undesirable transient process with expanded current which is harmful for the converter *** this paper,a transient current estimation method is proposed for the scenario of converter-grid phase difference caused by the frequency shifting of the grid side.A piecewise phase calculation model is established to determine the transient phase difference of the ***,according to the maximum phase difference calculated by the model,the system stability is assessed and the maximum value of system transient current can be estimated after comparing the maximum phase difference with the critical phase difference and π,Finally,the current estimation results are verified by detailed circuit simulations of a 21-level MMC-HVDC system built in PSCAD.

关键词： Index Terms-Frequency disturbance phase difference MMC-HVDC stability analysis transient current

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Simulation experiment of immature oil genetic mechanism in lake facies of semi-salt water

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Chinese Science Bulletin 1999年第11期44卷 980-988页

作者： Linye Zhang Shouchun Zhang Kaiquan huang Qingong Zhuo Zhihua Hong Difan huang Tieguan Wang Shengli Petr Adm Geol Res Inst Dongying Peoples R China Res Inst Petr Explorat & Dev Beijing 100083 Peoples R China Petreum Univ Beijing 102200 Peoples R China

The immature calcareous shale in the south slope of Dongying sag, Jiyang depression, plays a significant role in immature oil genesis, and is sampled to make simulation experiment. The geochemical characters of the products of soluble organic matter and kerogen are researched respectively. The yields of the two components and their relations are made out. The contribution ratio between soluble organic matter and kerogen undergoing early degradation in lake facies of semi-salt water is figured out for the first time, so the research into the genetic mechanism of immature oil is developed.

关键词： immature oil simulation genetic mechanism semi-salt water soluble organic matter.

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Importin-β2: a key to two gates?

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Protein & Cell 2010年第9期1卷 791-792页

作者： Kaiyao huang Che-Chia Tsao Department of Molecular Cellular and Developmental BiologyYale UniversityNew HavenCT 06511USA

A key communication device of vertebrate cells is the primary cilium,a singular flagellum-like structure protruding from the cell *** do the primary cilium and the cell nucleus have in common?Very little,that is until a recent study from Kristen Verhey’s laboratory of the University of Michigan Medical School at Ann Arbor,in which the authors showed that Importin-β2 and small GTPase Ran control the access of molecules into the primary cilium(Dishinger et al.,2010).Because the same importin-β2 and Ran are part of the cellular machinery guarding the entry into the nucleus through nuclear pore complexes(NPC),this observation raised a provocative possibility that a“pore-like opening”may stand in between the cilium and the rest of the cell body,a conjecture that has haunted the cilium research field for many *** proven to be true,the existence of a“ciliary pore”will have profound implications.

关键词： surface. complexes singular

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Theoretical and numerical research on the dynamic launch response of carbon fiber composite cartridges

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Defence Technology（防务技术） 2024年第3期33卷 426-436页

作者： Ruijie Zhang Hui Xu Chenlei huang Kun Liu Zhilin Wu School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuChina

Understanding the dynamic response of composite material cartridges during the firing process is of great significance for improving their reliability and safety.A theoretical model describing the dynamic response of composite material cartridges is established based on the thick-walled cylinder theory and rate-dependent constitutive model of composite *** correctness of the theoretical model is validated through finite element simulations of cartridge *** influence of chamber pressure and cartridge wall thickness on the cartridge's deformation process and stress distribution is *** results indicate that the primary deformation of composite material cartridges inside the chamber is elastic *** to metal cartridges,composite material cartridges require higher pressure for touching-chamber and are more prone to developing gaps after unloading to ensure smooth *** the deformation process,the touching-chamber behavior of the cartridge can improve the stress *** the same chamber pressure,the touching-chamber behavior can reduce the circumferential stress by approximately 30%.The inner wall surface of the cartridge is a critical area that requires *** touching-chamber behavior can be facilitated by appropriately reducing the cartridge wall thickness while ensuring overall *** study can provide guidance for the optimization design of composite material cartridges.

关键词： Composite material cartridges Dynamic response Thick-walled cylinder theory Finite element simulation Toughing-chamber behavior

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RS-store:RDMA-enabled skiplist-based key-value store for efficient range query

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Frontiers of Computer Science 2021年第6期15卷 133-146页

作者： Chenchen huang Huiqi HU Xuecheng Qi Xuan ZHOU Aoying ZHOU School of Data Science and Engineering East China Normal UniversityShanghai 200062China

Many key-value stores use RDMA to optimize the messaging and data transmission between application layer and the storage layer,most of which only provide point-wise ***-based store can support both point operations and range queries,but its CPU-intensive access operations combined with the high-speed network will easily lead to the storage layer reaches CPU *** common solution to this problem is offloading some operations into the application layer and using RDMA bypassing CPU to directly perform remote access,but this method is only used in the hash tablebased *** this paper,we present RS-store,a skiplist-based key-value store with RDMA,which can overcome the CPU handle of the storage layer by enabling two access modes:local access and remote *** RS-store,we redesign a novel data structure R-skiplist to save the communication cost in remote access,and implement a latch-free concurrency control mechanism to ensure all the concurrency during two access ***-store also supports client-active range query which can reduce the storage layer’s CPU *** last,we evaluate RS-store on an RDMA-capable *** results show that RS-store achieves up to 2x improvements over RDMA-enabled RocksDB on the throughput and application’s scalability.

关键词： key-value store skiplist RDMA

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A LiDAR Point Clouds Dataset of Ships in a Maritime Environment

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IEEE/CAA Journal of Automatica Sinica 2024年第7期11卷 1681-1694页

作者： Qiuyu Zhang Lipeng Wang Hao Meng Wen Zhang Genghua huang the College of Intelligent Systems Science and Engineering Harbin Engineering UniversityHarbin 150001China Key Laboratory of Space Active Opto-Electronics Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China

For the first time, this article introduces a LiDAR Point Clouds Dataset of Ships composed of both collected and simulated data to address the scarcity of LiDAR data in maritime applications. The collected data are acquired using specialized maritime LiDAR sensors in both inland waterways and wide-open ocean environments. The simulated data is generated by placing a ship in the LiDAR coordinate system and scanning it with a redeveloped Blensor that emulates the operation of a LiDAR sensor equipped with various laser beams. Furthermore,we also render point clouds for foggy and rainy weather conditions. To describe a realistic shipping environment, a dynamic tail wave is modeled by iterating the wave elevation of each point in a time series. Finally, networks serving small objects are migrated to ship applications by feeding our dataset. The positive effect of simulated data is described in object detection experiments, and the negative impact of tail waves as noise is verified in single-object tracking experiments. The Dataset is available at https://***/zqy411470859/ship_dataset.

关键词： 3D point clouds dataset dynamic tail wave fog simulation rainy simulation simulated data

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High plasticity mechanism of high strain rate rolled Mg-Ga alloy sheets

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Journal of Materials Science & Technology 2022年第6期101卷 187-198页

作者： Wensen huang Jihua Chen Hongge Yan Weijun Xia Bin Su School of Materials Science and Engineering Hunan UniversityChangsha 410082China Hunan Provincial Key Laboratory of Spray Deposition Technology&Application Hunan UniversityChangsha 410082China

By observing the microstructure evolution of Mg-Ga alloy during tensile deformation, it is found that the prismatic slip and the pyramidal slip occur during the tensile process at room temperature, which finally leads to the plenty of dislocation accumulation. After 8% tensile deformation,the {1012} extension twin is the main way to coordinate the strain in the c-axis direction for the alloy with the Ga content lower than 2 wt.%, but the pyramidal slip is the main way to coordinate the strain along the c-axis direction for the alloy with the Ga content higher than 2 wt.%. The Ga addition can promote the activation of the non-basal slip, which is beneficial to the work-hardening of the alloy to achieve better plasticity. Dynamic precipitation can slightly reduce the increment of *** preparation method of high strain rate rolling(HSRR) is another important reason for the plasticity of magnesium alloy sheets, and it is an important embodiment of the application of the dislocation engineering concept in magnesium alloy. The non-basal dislocations derived from the HSRR deformation can provide the non-basal dislocation sources when magnesium alloy is deformed at room temperature,resulting in good ductility. This study can be used as a reference for preparing wrought magnesium alloy with high strength and high plasticity by Ga alloying and hot deformation.

关键词： High plasticity High strain rate rolling Mg-Ga Dislocation engineering

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Systematic Elastostatic Stiffness Model of Over-Constrained Parallel Manipulators Without Additional Constraint Equations

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Chinese Journal of Mechanical Engineering 2024年第4期37卷 258-276页

作者： Chao Yang Wenyong Yu Wei Ye Qiaohong Chen Fengli huang College of Mechanical and Electrical Engineering Jiaxing UniversityJiaxing 314001ZhejiangChina Zhejiang Siekon Transmission Technology Co. Ltd.Jiaxing 314001ZhejiangChina National and Local Joint Engineering Research Center of Reliability Analysis and Testing for Mechanical and Electrical Products Zhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina School of Computer Science and Technology Zhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina

The establishment of an elastostatic stiffness model for over constrained parallel manipulators(PMs),particularly those with over constrained subclosed loops,poses a challenge while ensuring numerical *** study addresses this issue by proposing a systematic elastostatic stiffness model based on matrix structural analysis(MSA)and independent displacement coordinates(IDCs)extraction *** begin,the closed-loop PM is transformed into an open-loop PM by eliminating constraints.A subassembly element is then introduced,which considers the flexibility of both rods and *** approach helps circumvent the numerical instability typically encountered with traditional constraint *** IDCs and analytical constraint equations of nodes constrained by various joints are summarized in the appendix,utilizing multipoint constraint theory and singularity analysis,all unified within a single coordinate ***,the open-loop mechanism is efficiently closed by referencing the constraint equations presented in the appendix,alongside its elastostatic *** proposed method proves to be both modeling and computationally efficient due to the comprehensive summary of the constraint equations in the Appendix,eliminating the need for additional *** example utilizing an over constrained subclosed loops demonstrate the application of the proposed *** conclusion,the model proposed in this study enriches the theory of elastostatic stiffness modeling of PMs and provides an effective solution for stiffness modeling challenges they present.

关键词： Parallel manipulator Elastostatic stiffness model Matrix structural analysis Subassembly element Independent displacement coordinates

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Brazing diamond grits onto AA7075 aluminium alloy substrate with Ag–Cu–Ti filler alloy by laser heating

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Chinese Journal of Aeronautics 2021年第6期34卷 67-78页

作者： Guoqin huang Yingda WANG Meiqin ZHANG Changcai CUI Zhen TONG Institute of Manufacturing Engineering Huaqiao UniversityXiamen 361021China Fujian Engineering Research Center of Intelligent Manufacturing for Britle Materials Xiamen 361021China National&Local Joint Engineering Research Centre for Intelligent Manufacturing Technology of Britle Material Products Huaqiao UniversityXiamen 361021China School of Mechanical and Automotive Engineering Xiamen University of TechnologyXiamen 361011China EPSRC Future Metrology Hub Centre for Precision TechnologiesUniversity of HuddersfieldHudersfield HDI 3DHUK

The brazing of diamond is a promising way to fabricate grinding wheels for efficient machining and precision *** work investigated the feasibility of bonding diamond grits onto Aluminium Alloy 7075(AA7075)substrate with a Ag–Cu–Ti filler alloy via laser fusion *** interfacial microstructures and the strength of the brazed diamond joints were *** cross-section of the brazed diamond joint consists of a molten filler alloy layer,a molten pool,a heat effect zone,a columnar crystal zone and an equiaxed crystal *** the interface of the filler alloy/substrate metal,microstructures observed possibly were Ag(s.s),Al(s.s),Tix Al,Al2 Cu and Mg intermetallic compounds.A layer of Ti C with a thickness of about 30–50 nm was found at the bonding interface of the diamond/filler *** averaged peak shear force of the brazed joints was found to be approximately 39.8 *** abrasion grinding test indicated that the diamond/AA7075 brazed joint was adequate for ***,the pulled-off of grit was found to be the primary failure of this type of brazed *** work broadened the brazing diamond technique and the range of applications of brazed diamond wheels for efficient grinding.

关键词： Ag–Cu–Ti filler alloy Aluminium alloy Brazing Diamond Fusion Interfacial microstructure Laser heating

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