检索结果-南通市图书馆

Journal of Thermal Science 2024年第6期33卷 2179-2189页

作者： li zeyu HUANG Caoxuheng YIN Jianhui School of Electric Power South China University of TechnologyGuangzhou 510640China Guangdong Province Key Laboratory of High Efficient and Clean Energy Utilization South China University of TechnologyGuangzhou 510640China Guangdong Province Engineering Research Center of High Efficient and Low Pollution Energy Conversion Guangzhou 510640China Ningbo Jetron Technology Co.Ltd. Ningbo 315000China

The two-stage transcritical CO_(2) refrigeration cycle with dedicated dual-subcooling and mechanical recooling is *** inter-stage pressure is critical for such cycle performances;however,it has not been studied ***,the research aim is to disclose the effect of inter-stage pressure on performances of the proposed *** main work consists of four ***,the comparative study is performed to display advantages of the proposed ***,the key temperatures,heat and power consumptions as well as performance indicators for different inter-stage pressures are analyzed in detail,based on the parametric ***,the optimal inter-stage pressure for different conditions is obtained by the nonlinear direct search ***,the economic performance is *** is found that the compressor power of the proposed cycle drops by 12%,and the working temperature lower limit is reduced by 11℃.Furthermore,it is considered that the optimal inter-stage pressure is insensitive to the heat source *** novelty lies in illustrating the effect of inter-stage pressure,obtaining trends of the optimal value,and pointing out the system *** paper is favorable for design and operation optimization of the proposed system.

关键词： CO,refrigeration two-stage cycle dedicated absorption subcooling recooling thermodynamic

Color-kinematics duality for Sudakov form factor in non-supersymmetric pure Yang-Mills theory

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第6期74卷 66-86页

作者： zeyu li Gang Yang Jinxuan Zhang CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesNo.19A Yuquan RoadBeijing 100049China

We study the duality between color and kinematics for the Sudakov form factors of tr(F~2)in non-supersymmetric pure Yang-Mills *** construct the integrands that manifest the color-kinematics duality up to two *** resulting numerators are given in terms of Lorentz products of momenta and polarization vectors,which have the same powers of loop momenta as that from the Feynman *** integrands are checked by d-dimensional unitarity cuts and are valid in any *** find that massless-bubble and tadpole topologies are needed at two loops to realize the color-kinematics ***,the two-loop solution contains a large number of free parameters suggesting the duality may hold at higher loop orders.

关键词： scattering amplitudes form factors color-kinematics duality unitarity method

The characteristics of mRNA m^(6)A methylomes in allopolyploid Brassica napus and its diploid progenitors

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2023年第1期10卷 69-81页

作者： zeyu li Mengdi li Xiaoming Wu Jianbo Wang State Key Laboratory of Hybrid Rice College of Life SciencesWuhan UniversityWuhan 430072HubeiChina Key Laboratory of Resource Biology and Biotechnology in Western China Ministry of EducationCollege of Life SciencesNorthwest UniversityXi’an 710069China Key Laboratory of Biology and Genetic Improvement of Oil Crops Ministry of AgricultureOil Crops Research Institute of CAASWuhan 430062China

Genome duplication events,comprising whole-genome duplication and single-gene duplication,produce a complex genomic context leading to multiple levels of genetic ***,the characteristics of m^(6)A modification,the most widespread internal eukaryotic mRNA modification,in polyploid species are still poorly *** study revealed the characteristics of m^(6)A methylomes within the early formation and following the evolution of allopolyploid Brassica *** found a complex relationship between m^(6)A modification abundance and gene expression level depending on the degree of enrichment or presence/absence of m^(6)A ***,the m^(6)A genes had lower gene expression levels than the non-m^(6)A *** may change the expression divergence of duplicated gene pairs with identical m^(6)A patterns and diverged m^(6)A *** with duplicated genes,singletons with a higher evolutionary rate exhibited higher m^(6)A *** kinds of duplicated genes exhibited distinct distributions of m^(6)A modifications in transcripts and gene expression *** particular,tandem duplication-derived genes showed unique m^(6)A modification enrichment around the transcript start *** histone modifications(H3K27ac and H3K4me3)but not DNA methylation were enriched around genes of m^(6)A *** findings provide a new understanding of the features of m 6A modification and gene expression regulation in allopolyploid plants with sophisticated genomic architecture.

关键词： polyp characteristics progenitor

Failure responses of rock tunnel faces during excavation through the fault-fracture zone

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Underground Space 2023年第3期10卷 166-181页

作者： zeyu li Hongwei Huang Mingliang Zhou Dongming Zhang Department of Geotechnical Engineering Tongji UniversitySiping Road 1239Shanghai 200092China

It is essential to cast light on the construction risks in tunnel excavations through the fault-fracture zone(FFZ).This study adopts the material point method(MPM)to simulate the failure responses of a rock tunnel face during excavation through the FFZ.A numerical study was conducted to compare a physical model test and validate the feasibility of using the MPM in simulating tunnel face *** hundred ninety numerical simulation cases were constructed to represent a rock tunnel excavation project with different site *** simulation results suggest that the cohesion and the friction angle significantly influence failure *** tunnel cover depth can magnify the failure responses,and the FFZ thickness significantly affects the mobilized rock mass volume when the FFZ consists of a weak rock *** numerical simulation results suggest three deformation patterns:face bulge,partial failure,and slide *** failure responses can be characterized by stress arch,slip surface,angle of reposing,and influence *** insights suggested by the face failure responses during excavation through the FFZ can aid field engineers in determining the scope of possible damage,and in establishing emergency measures to minimize losses if such failure occurs.

关键词： Tunnel face failure Rock tunnel excavation Large deformation Fracture fault zone Material point method

Collaborative positioning for swarms:A brief survey of vision,liDAR and wireless sensors based methods

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第3期33卷 475-493页

作者： zeyu li Changhui Jiang Xiaobo Gu Ying Xu Feng zhou Jianhui Cui College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdao266590China Geoloc Laboratory Universite Gustave EiffelParis77454France School of Automation Guangdong University of TechnologyGuangzhou510006China

As positioning sensors,edge computation power,and communication technologies continue to develop,a moving agent can now sense its surroundings and communicate with other *** receiving spatial information from both its environment and other agents,an agent can use various methods and sensor types to localize *** its high flexibility and robustness,collaborative positioning has become a widely used method in both military and civilian *** paper introduces the basic fundamental concepts and applications of collaborative positioning,and reviews recent progress in the field based on camera,liDAR(light Detection and Ranging),wireless sensor,and their *** paper compares the current methods with respect to their sensor type,summarizes their main paradigms,and analyzes their evaluation ***,the paper discusses the main challenges and open issues that require further research.

关键词： Collaborative positioning Vision liDAR Wireless sensors Sensor fusion

Cloning and Characterization of Protein Prenyltransferase Alpha Subunit in Rice

在线全文

学校读者我要写书评

暂无评论

Rice science 2021年第6期28卷 557-566,I0037页

作者： WANG Tao LOU lijuan li zeyu SHANG lianguang WANG Quan Shenzhen Branch Guangdong Laboratory for Lingnan Modem Agriculture/Genome Analysis Laboratory of Ministry of Agriculture and Rural Affairs/Agricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518120China

Protein prenylation plays a crucial role in plant development and stress *** report the function of pren yltra nsferase a-sub unit in ***-protei n in teractions showed that the fam esyl-transferase(OsPFT)/geranylgeranyltransferase-l(OsPGGT l-a)protein interacted together with OsPFT-P and OsPGGT *** a-and p-subunits of OsPFT formed a heterodimer for the transfer of a farnesyl group from famesyl pyrophosphate to the CaaX-box-containing peptide ***,the tissue expressi on patter ns of the OsPFT and OsPGGT I sub units were similar,and these sub units were localized in the cytoplasm and ***,OsPFT/OsPGGT/-a-deletion homozygous rice mutants had a lethal phenotype,and the heterozygous mutants exhibited reduced pollen *** results indicated that prenylation plays an important role in rice development.

关键词： protein prenylation plant development rice pollen viability

An improved particle filter indoor fusion positioning approach based on Wi-Fi/PDR/geomagnetic field

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第2期32卷 443-458页

作者： Tianfa Wang litao Han Qiaoli Kong zeyu li Changsong li Jingwei Han Qi Bai Yanfei Chen College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdao266590China Key Laboratory of Geomatics and Digital Technology of Shandong Province Shandong University of Science and TechnologyQingdao266590China

The existing indoor fusion positioning methods based on Pedestrian Dead Reckoning(PDR)and geomagnetic technology have the problems of large initial position error,low sensor accuracy,and geomagnetic *** this study,a novel indoor fusion positioning approach based on the improved particle filter algorithm by geomagnetic iterative matching is proposed,where Wi-Fi,PDR,and geomagnetic signals are integrated to improve indoor positioning *** important contribution is that geomagnetic iterative matching is firstly proposed based on the particle filter *** the positioning process,an iterative window and a constraint window are introduced to limit the particle generation range and the geomagnetic matching range *** position is corrected several times based on geomagnetic iterative matching in the location correction stage when the pedestrian movement is detected,which made up for the shortage of only one time of geomagnetic correction in the existing particle filter *** addition,this study also proposes a real-time step detection algorithm based on multi-threshold constraints to judge whether pedestrians are moving,which satisfies the real-time requirement of our fusion positioning *** experimental verification,the average positioning accuracy of the proposed approach reaches 1.59 m,which improves 33.2%compared with the existing particle filter fusion positioning algorithms.

关键词： Fusion positioning Particle filter Geomagnetic iterative matching Iterative window Constraint window

Synchronous Synthesis and Immobilization of Metal Phthalocyanine for Aerobic Oxidation of Styrene

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2020年第4期22卷 73-84页

作者： liu Yefeng LüYing li zeyu Shen Yue Wang Ruixin School of Chemical Engineering and Technology North University of ChinaTaiyuan 030051

In this study,the precursor 4-(4-carboxy-phenoxy)phthalonitrile(CPPN)was first bonded onto the silica gel surface modified with poly(glycidyl methacrylate)(PGMA)(PGMA/SiO2)to prepare CPPN-PGMA/SiO2,and metal phthalocyanine(MPc;M=Co,Fe,Cu,Mn)was supported on the PGMA/SiO2 surface to prepare MPc-PGMA/SiO2 by synchronous synthesis and immobilization with phthalonitrile and metal salt in the *** chemical composition and surface morphology were characterized by the Fourier transform infrared(FTIR)spectroscopy,UV-Vis spectroscopy,scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),and thermogravimetry analysis(TGA).The catalytic performance of MPc-PGMA/SiO2 in epoxidation of styrene was also investigated with molecular oxygen acting as the *** results show that MPc-PGMA/SiO2 can efficiently and selectively catalyze molecular oxygen for oxidation of styrene to styrene oxide under mild ***,the catalytic activity differs substantially depending on the central metal,and a highest catalytic activity is achieved by CoPc-PGMA/*** CoPc-PGMA/SiO2 amount and temperature can also affect the catalytic oxidation of styrene,and at normal atmospheric pressure,a maximum conversion rate of styrene(99%)and selectivity of styrene oxide(53%)are obtained using 0.1 g of CoPc-PGMA/SiO2(22.61μmol of CoPc)at 100℃ for 6 ***-PGMA/SiO2 also has excellent reusability,and the conversion rate of styrene is still over 90%after 5 cycles.

关键词： metal phthalocyanine poly glycidyl methacrylate synchronous synthesis and immobilization catalytic oxidation styrene

Viologens-based redox mediators with tunable HOMO–LUMO energy gap for highly effective hydrogen peroxide electrosynthesis

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第12期16卷 12936-12941页

作者： Yang Gao Xiaohui Xu Yue Niu Xinran Hu zeyu li Longkun Yang linjie Zhi Bin Wang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China The Beijing Key Laboratory for Nano-Photonics and Nano-Structure(NPNS) Department of PhysicsCapital Normal UniversityBeijing 100048China College of New Energy China University of Petroleum(East China)Qingdao 266580China

In comparison with the developing nano-carbon catalysts,some small organic molecules are also emerging as catalysts with typical features,however,their working mechanism is still ***,we synthesized a series of viologen-based heterogeneous catalysts with the same molecular skeleton but different substituent groups through anion exchange *** viologen-based molecules were used as a model catalyst to investigate the underlying structure–function relationship for small molecules-based H_(2)O_(2) *** from the commonly reported carbon-based electrocatalysts,viologens can produce H_(2)O_(2) in a synergistic manner,which means that viologens can not only directly catalyze oxygen reduction but also serve as a redox *** found that the ring current and H_(2)O_(2) selectivity of viologens deliver an increasing trend with the increase of the alkyl chain length of alkyl-substituted viologens and further increase when using benzyl as the substituent *** a result,a benzyl-substituted viologen(BV)delivers the best electrocatalytic performance among the samples,including the highest H_(2)O_(2) selectivity of 96.9%at 0.6 V and the largest ring current density of about 13.6 mA·***,density functional theory(DFT)calculations disclose that the carbon atoms bonded with positively charged N are the active sites and the small highest occupied molecular orbital(HOMO)–lowest unoccupied molecular orbital(LUMO)energy gap of BV is beneficial to the synergistic mechanism for H_(2)O_(2) *** work sheds new insight into the efficient H_(2)O_(2) production in a synergistic manner for small molecules-based electrocatalysts.

关键词： viologens electrocatalysis hydrogen peroxide redox mediator oxygen reduction

Numerical investigation of separation efficiency of the cyclone with supercritical fluid-solid flow

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2022年第3期20卷 36-46页

作者： zeyu li Zhenbo Tong Aibing Yu Hao Miao Kaiwei Chu Hao Zhang Gang Guo Jiang Chen School of Energy and Environment Southeast UniversityNanjing 210096China Southeast University-Monash University Joint Research Institute Suzhou215123China Department of Chemical Engineering Monash UniversityClaytonVic 3800Australia School of Qilu Transportation Shandong UniversityJinan250002China School of Metallurgy Northeastern UniversityShenyang110819China

The utilization of hydrogen is gaining increasing attention due to its high heating value and environmentally friendly combustion *** supercritical water circulating fluidized bed reactor is a promising and potentially clean technology that can generate hydrogen from coal *** is a vital part of the reactor which can separate incomplete decomposition of pulverized coal particles from mixed working *** paper aims to gain in-depth understanding of the cyclone separation mechanisms under supercritical fluid by computational fluid dynamics(CFD).Although the amount of supercritical carbon dioxide in mixed working fluid is minor,it obviously influences the flow fields and separation efficiency of a *** simulation results suggest that both the decreasing content of supercritical carbon dioxide and adding the extra dipleg cause the promoting performance of *** findings could refine the design of supercritical fluid-solid cyclones.

关键词： Cyclone Supercritical fluid-solid flow Computational fluid dynamics