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Science China(Information Sciences) 2018年第1期61卷 136-149页

作者： jingyu zhang Minyi GUO Chentao WU Yuanyi CHEN Department of Computer Science and Engineering Shanghai Jiao Tong University

With the emerging of 3 D-stacking technology, the dynamic random-access memory(DRAM)can be stacked on chips to architect the DRAM last level cache(LLC). Compared with static randomaccess memory(SRAM), DRAM is larger but slower. In the existing research papers, a lot of work has been devoted to improving the workload performance using SRAM and stacked DRAM together, ranging from SRAM structure improvement, to optimizing cache tag and data access. Instead, little attention has been paid to designing an LLC scheduling scheme for multi-programmed workloads with different memory footprints. Motivated by this, we propose a self-adaptive LLC scheduling scheme, which allows us to utilize SRAM and 3 D-stacked DRAM efficiently, achieving better workload performance. This scheduling scheme employs(1) an evaluation unit, which is used to probe and evaluate the cache information during the process of programs being executed; and(2) an implementation unit, which is used to self-adaptively choose SRAM or DRAM. To make the scheduling scheme work correctly, we develop a data migration policy. We conduct extensive experiments to evaluate the performance of our proposed scheme. Experimental results show that our method can improve the multi-programmed workload performance by up to 30% compared with the state-of-the-art methods.

关键词： 3D-stacking technology cache architecture cache scheduling multi-programmed workloads memory system performance optimization

Detecting the backfill pipeline blockage and leakage through an LSTM-based deep learning model

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International Journal of Minerals,Metallurgy and Materials 2023年第8期30卷 1573-1583页

作者： Bolin Xiao Shengjun Miao Daohong Xia Huatao Huang jingyu zhang State Key Laboratory of High-Efficiency Mining and Metal Mine Safety Ministry of EducationUniversity of Science and Technology BeijingBeijing 100083China School of Advanced Engineering University of Science and Technology BeijingBeijing 100083China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China Yunnan Jinchengxin Mining Management Co. Ltd.Kunming 650217China Xinjiang Daming Mining Group Co. Ltd.Hami 839121China

Detecting a pipeline's abnormal status,which is typically a blockage and leakage accident,is important for the continuity and safety of mine *** pipeline system for gravity-transport high-density backfill(GHB)is *** designed,efficient,and accurate abnormal pipeline detection methods for GHB are *** work presents a long short-term memory-based deep learning(LSTM-DL)model for GHB pipeline blockage and leakage ***,an industrial pipeline monitoring system was introduced using pressure and flow ***,blockage and leakage field experiments were designed to solve the problem of negative sample *** pipeline's statistical characteristics with different working statuses were analyzed to show their ***,the architecture of the LSTM-DL model was elaborated on and ***,the LSTM-DL model was compared with state-of-the-art(SOTA)learning *** results show that the backfilling cycle comprises multiple working phases and is *** pressure and flow signals fluctuate stably in a normal cycle,their values are diverse in different *** causes a sudden change in interval signal features;leakage results in long variation duration and a wide fluctuation *** the SOTA models,the LSTM-DL model has the highest detection accuracy of98.31%for all states and the lowest misjudgment or false positive rate of 3.21%for blockage and leakage *** proposed model can accurately recognize various pipeline statuses of complex GHB systems.

关键词： mine backfill blockage and leakage pipeline detection long short-term memory networks deep learning

Experimental Study on Emission Performance of an LPP/TVC

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Chinese Journal of Aeronautics 2012年第3期25卷 335-341页

作者： JIN Yi HE Xiaomin zhang jingyu JIANG Bo WU Zejun College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

A key issue in the commercial aircraft engine design is environmental acceptability, and designers are continually challenged to reduce emissions. In this paper, an experimental investigation is performed to evaluate the emission performance of a liquid-fueled trapped vortex combustor （TVC） under lean premixed prevaporized （LPP） mode. When operating as an LPP system, a TVC is fueled both in the cavities and in the main stream. The correlations between the emission performance and the total ex- cess air ratio, the positions （4 positions） of the fuel injectors in the main stream, and the inlet temperature are obtained. Experimental results show that both the volume concentrations of unburnt hydrocarbon （UHC） and NOv （NO, NOxusually grouped together as NOx） increase with the increase of total excess air ratio from 1.5 to 3.0; the emission performance relies heavily on the position of the main stream injector, and the best perfomlance is achieved at Position 4 in the experiments, the increase of the inlet temperature impacts on the emission performance positively： the smallest volume concentrations of UHC and NO,. obtained in the experiment are 94×10^-6 and 2.3× 10 ^-6 respectively. This paper validates the feasibility of low emissions for an LPP/TVC and provides a reference for further optimization of TVCs.

关键词： aerospace propulsion system combustion lean premixed prevaporized trapped vortex combustor liquid fuel emis-sion

In-situ construction of MnCO_(3)@CNTs nanosheets for high-capacity aqueous zinc ion batteries

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Science China(Technological Sciences) 2024年第11期67卷 3394-3404页

作者： LI Tao DAI GeLiang LIU SiYu zhang jingyu SUN AoKui School of Packaging and Materials Engineering Hunan University of TechnologyZhuzhou 412007China

Owing to severe agglomeration of manganese carbonate(MnCO_(3))during its synthesis,it exhibits rapid decay cycle performance when used as a cathode material in aqueous zinc ion *** overcome this drawback,we synthesized a MnCO_(3)material with carbon nanotubes(CNTs)(i.e.,MnCO_(3)@CNTs)via a one-step solvothermal method using a hybrid modification ***_(3)nanospheres were grown in-situ on a two-dimensional(2D)plane that was orderly interwoven by tubular single fibers of carbon to form a leaf-like nanosheet *** surface area of the MnCO_(3)@CNTs material was enlarged enormously through the special nanosheet structure,and its stability was improved by the supporting structure of the *** a result,the MnCO_(3)@CNTs exhibited a discharge capacity of 247.6 mAh g^(-1)at a current density of 0.1 A g^(-1).The energy storage mechanism of MnCO_(3)@CNTs was further explored using a series of electrochemical kinetic analyses and ex-situ characterization *** modification method not only broadens the application field of MnCO_(3),but also provides the possibility of modifying more cathode materials.

关键词： manganese carbonate cathode materials aqueous zinc ion batteries energy storage mechanism

PAM: an efficient power-aware multilevel cache policy to reduce energy consumption of storage systems

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Frontiers of Computer Science 2019年第4期13卷 850-863页

作者： Xiaodong MENG Chentao WU Minyi GUO Long ZHENG jingyu zhang Shanghai Key Laboratory of Scalable Computing and Systems Department of Computer Science & Engineering Shanghai Jiao Tong University Shanghai 200240 China

Energy consumption is one of the most significant aspects of large-scale storage systems where multilevel caches are widely used. In a typical hierarchical storage structure, upper-level storage serves as a cache for the lower level, forming a distributed multilevel cache system. In the past two decades, several classic LRU-based multilevel cache policies have been proposed to improve the overall I/O performance of storage systems. However, few power-aware multilevel cache policies focus on the storage devices in the bottom level, which consume more than 27% of the energy of the whole system [1]. To address this problem, we propose a novel power-aware multilevel cache (PAM) policy that can reduce the energy consumption of high-performance and I/O bandwidth storage devices. In our PAM policy, an appropriate number of cold dirty blocks in the upper level cache are identified and selected to flush directly to the storage devices, providing high probability extension of the lifetime of disks in standby mode. To demonstrate the effectiveness of our proposed policy, we conduct several simulations with real-world traces. Compared to existing popular cache schemes such as PA? LRU, PB-LRU, and Demote, PAM reduces power consumption by up to 15% under different I/O workloads, and improves energy efficiency by up to 50.5%.

关键词： storage system multilevel cache energy consumption I/O performance hint

Effects of solar radiation modification on the ocean carbon cycle:An earth system modeling study

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Atmospheric and Oceanic Science Letters 2022年第3期15卷 56-63页

作者： Xiaoyu Jin Long Cao jingyu zhang Department of Atmospheric Sciences School of Earth SciencesZhejiang UniversityHangzhouChina

Solar radiation modification(SRM,also termed as geoengineering)has been proposed as a potential option to counteract anthropogenic *** underlying idea of SRM is to reduce the amount of sunlight reaching the atmosphere and surface,thus offsetting some amount of global ***,the authors use an Earth system model to investigate the impact of SRM on the global carbon cycle and ocean *** authors simulate the temporal evolution of global climate and the carbon cycle from the pre-industrial period to the end of this century under three scenarios:the RCP4.5 CO_(2) emission pathway,the RCP8.5 CO_(2) emission pathway,and the RCP8.5 CO_(2) emission pathway with the implementation of SRM to maintain the global mean surface temperature at the level of *** simulations show that SRM,by altering global climate,also affects the global carbon *** to the RCP8.5 simulation without SRM,by the year 2100,SRM reduces atmospheric CO_(2) by 65 ppm mainly as a result of increased CO_(2) uptake by the terrestrial ***,SRM-induced change in atmospheric CO_(2) and climate has a small effect in mitigating ocean *** the year 2100,relative to RCP8.5,SRM causes a decrease in surface ocean hydrogen ion concentration([H^(+)])by 6% and attenuates the seasonal amplitude of[H^(+)]by about 10%.The simulations also show that SRM has a small effect on globally integrated ocean net primary productivity relative to the high-CO_(2) simulation without *** study contributes to a comprehensive assessment of the effects of SRM on both the physical climate and the global carbon cycle.

关键词： Solar radiation modification Geoengineering Carbon cycle Ocean acidification Ocean biogeochemistry

Experimental Investigation on Liner Cooling Characteristics of a Mixed-Flow Trapped Vortex Combustor

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Journal of Thermal Science 2023年第6期32卷 2222-2234页

作者： zhang jingyu WANG Min WANG Long WANG Jiaxi JIANG Ping HE Xiaomin College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing210016China

The mixed-flow trapped vortex combustor(TVC)is a new type of combustor that applies trapped vortex flame stabilization technology to mixed-flow *** with the traditional mixed-flow combustor,the mixed-flow TVC has many advantages,such as complicated structure of the vortex flow field inside liner,large cooling area,significant local hot spots on the liner,and large wall temperature *** this paper,for a mixed-flow TVC with inclined multi-hole cooling,the liner wall temperature of an annular test rig was examined in *** effects of inlet temperature(T3),inlet Mach number(Ma)and fuel to air ratio(FAR)on the temperature of liner wall were obtained,which provided a valuable reference for understanding the distribution characteristics of liner wall *** experiment results show that the highest temperature is found to be on the fore-wall of the *** T3 and FAR are low,the highest wall temperature was obtained in injector ***,the wall temperature in the center plane between two adjacent injectors was higher than that in injector plane under the condition of high FAR and *** the increase of FAR and T3,the average wall temperature *** has a slight impact on the average wall *** addition,this paper provides an effective reference for the design and improvement of the liner cooling structure of the combustor with many discontinuous small-area walls in the flow *** is difficult to form a continuous film,and cooling requirements can’t be achieved only by using inclined multi-hole cooling *** needs to be given to other efficient cooling structures,or to the combination of multiple cooling structures.

关键词： mixed-flow TVC liner cooling inclined multi-hole cooling wall temperature experiment

Extraction of Eugenol from Essential Oils by In Situ Formation of Deep Eutectic Solvents:A Green Recyclable Process

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Journal of Analysis and Testing 2024年第1期8卷 63-73页

作者： Lingqi Shen Xiangzi Jin Zhihui zhang Yuexing Yi jingyu zhang Zuguang Li College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014China Department of Chemistry Yanbian UniversityYanji 133002China Transfar Zhilian Co. Ltd.Hangzhou 311215China

Eugenol is extensively utilized in chemical *** actual production,it is mainly separated from clove essential oils(EOs)through acid-base *** this work,a simple,rapid and effective extraction process was developed for the extraction of eugenol from EOs samples by directly forming deep eutectic solvents(DESs)without using acid-base *** proposed process is designed to dissolve EOs in n-hexane and eugenol was highly selective extracted into DESs with tetrabutylammonium chloride(TBAC).Hydrogen bonds in DESs can be broken by addition of water,resulting in a separation of the two phases,thus obtaining a hydrophobic yellowish eugenol in the upper *** quaternary ammonium salt in the lower aqueous solution can be reused after *** most determining influence factors such as the structure of quaternary ammonium salt,the mole ratio of quaternary ammonium salt to eugenol and the amount of n-hexane were *** forming conditions of DESs were studied by Box-Behnken design(BBD).Experiment was carried out under the optimal conditions and good experimental result was demonstrated by the developed process,a high extraction recovery of 92.51% and the purity was about 98.50%,which verifies the excellent performance for the proposed process.

关键词： Eugenol Deep eutectic solvent Essential oils Tetrabutylammonium chloride

Transcriptome-wide Analysis Of Vernalization Reveals Conserved and Species-specific Mechanisms in Brachypodium

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Journal of Integrative Plant Biology 2013年第8期55卷 696-709页

作者： Qing Huan Zhiwei Mao jingyu zhang Yunyuan Xu Kang Chong Key Laboratory of Plant Molecular Physiology Institute of Botanythe Chinese Academy of Sciences University of Chinese Academy of Sciences the Chinese Academy of Sciences

Several temperate cereals need vernalization to promote flowering. Little, however, is known about the vernalization-memory-related genes, and almost no comparative analysis has been performed. Here, RNA- Seq was used for transcriptome analysis in non-vernalized, vernalized and post-vernalized Brachypodium distachyon （L.） Beauv. seedlings. In total, the expression of 1,665 genes showed significant changes （fold change 〉4） in response to vernalization. Among them, 674 putative vernalization-memory-related genes with a constant response to vernalization were significantly enriched in transcriptional regulation and monooxygenase-mediated biological processes. Comparative analysis of vernalization-memory-related genes with barley demonstrated that the oxidative-stress response was the most conserved pathway between these two plant species. Moreover, Brachypodium preferred to regulate transcription and protein phosphorylation processes, while vernalization-memory-related genes, whose products are cytoplasmic membrane-bound-vesicle-located proteins, were preferred to be regulated in barley. Correlation analysis of the vernalization-related genes with barley revealed that the vernalization mechanism was conserved between these two plant species. In summary, vernalization, including its memory mechanism, is conserved between Brachypodium and barley, although several species-specific features also exist. The data reported here will provide primary resources for subsequent functional research in vernalization.

关键词： Brachypodium comparative analysis RNA-Seq vernalization.

Watermelon-like multicore-shell Fe(PO_(3))_(2)@carbon nanocapsule anode to construct an all iron phosphate-based sodium ion battery

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Nano Research 2022年第10期15卷 9026-9037页

作者： Lu Yue jingyu zhang Meng Kong Kai Li Wenhui zhang Xiaotian Guo Mengmeng Xiao Feng zhang Huan Pang Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China

Rechargeable sodium ion battery(SIB)has attracted much attention ***,the deficiency of high-performance electrode materials limits its commercial *** new cost-effective,high safe electrode materials and full battery matching technology is an important direction of future *** this work,a novel watermelon-like multicore-shell Fe(PO_(3))_(2)@C nanocapsule anode material is designed via a facile and eco-friendly process for high performance ***(PO_(3))_(2)@C composite anode exhibits remarkable electrochemical performances for SIB,showing high sodium storage capacity(452 mAh·g^(-1) at 0.2 A·g^(-1)),good rate(235 mAh·g^(-1) at 10 A·g^(-1)),stable long-term cycling life(210 mAh·g^(-1) over 2,000 cycles under 5 A·g^(-1)),and superior high-low temperature ***,a new type all iron-based phosphate full battery with high specific capacity is constructed,which can output initial capacity of 309 mAh·g^(-1) and a high energy density of 254,107,and 82 Wh·kg^(-1) at the power density of 186,917,and 1,640 W·kg^(-1) at room *** exceptional performance of multicoreshell Fe(PO_(3))_(2)@C nanocapsule structure can be ascribed to the large specific surface,good structure stability,high conductivity,as well as the multiple layer protection for superior electron/ion transportation.

关键词： Fe(PO_(3))_(2)anode watermelon-like multicore-shell composite electrochemical performance sodium ion battery