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滴灌施肥频率对烤烟生长、氮肥利用及烟叶产质量的影响

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节水灌溉 2024年第3期 68-74,82页

作者：马二登薛如君高天代快刘忠华李军营徐照丽邓小鹏赵正雄云南省烟草农业科学研究院昆明650031 云南省烟草公司大理州公司云南大理671000 海南红塔卷烟有限责任公司海口571137 云南省烟草公司玉溪市公司云南玉溪653100 中国烟草总公司云南省公司昆明650011 云南农业大学昆明650201

为探明滴灌施肥频率对烤烟生长、氮肥利用及烟叶产质量的影响,2018-2019年通过田间试验,以不施肥空白(CK)和当地常规处理(CF,即肥料干施+滴灌)为对照,研究低频滴灌施肥(DF1,即养分管理期1次滴灌施肥)、中频滴灌施肥(DF2,即养分管理期连... 详细信息

为探明滴灌施肥频率对烤烟生长、氮肥利用及烟叶产质量的影响,2018-2019年通过田间试验,以不施肥空白(CK)和当地常规处理(CF,即肥料干施+滴灌)为对照,研究低频滴灌施肥(DF1,即养分管理期1次滴灌施肥)、中频滴灌施肥(DF2,即养分管理期连续2天每天1次滴灌施肥)和高频滴灌施肥(DF3,即养分管理期连续3天每天1次滴灌施肥)对烤烟农艺性状、根系发育形态、氮肥累积量和利用效率及烟叶产质量的影响。结果表明,与CF相比,各滴灌施肥处理烟叶产量无显著差异(P<0.05),氮肥利用率有不同程度提高,烟株发育状况则因滴灌施肥频率而异。与DF1和DF2相比,DF3烟株旺长期叶面积系数分别增加了7.3%~33.3%和1.6%~28.7%,根系体积分别增加了3.9%~46.6%和21.2%~40.5%,氮素利用率分别提高了39.0%~95.0%和21.5%~34.3%,烟叶烟碱含量分别增加了17.5%~28.5%和12.5%~20.0%。与中频滴灌施肥和低频滴灌施肥相比,高频滴灌施肥有利于促进烟株生长和根系形态发育,提高氮肥利用效率和烟叶品质质量,是有效协同氮肥高效利用和烟叶产质量的滴灌施肥措施。

关键词：烤烟滴灌施肥频率氮肥利用根系形态

Artesunate inhibits growth and induces apoptosis in human osteosarcoma HOS cell line in vitro and in vivo

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第4期12卷 247-255页

作者： Qiang xu zhao-xu li Hui-qin PENG Zheng-wang SUN Rui-lin CHENG zhao-ming YE Wei-xu Department of Orthopaedics the Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310009 China Department of Medical Microbiology and Parasitology School of Medicine Zhejiang University Hangzhou 310058 China

This paper aims to investigate the effects of artesunate (ART) on growth and apoptosis in human osteosarcoma HOS cell line in vitro and in vivo and to explore the possible underlying *** viability was measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) *** induction of apoptosis was detected by light and transmission electron microscopy and flow *** blot analysis was used to investigate the related *** mice were further employed to investigate the antitumour activity of ART in *** assay results demonstrated that ART selectively inhibits the growth of HOS cells in a dose-and time-dependent *** on the findings of light and transmission electron microscopy,Hoechst 33258 staining,and fluorescein isothiocyanate (FITC)-annexin V staining,the cytotoxicity of ART in HOS cells occurs through *** ART treatment,cytosolic cytochrome c was increased,Bax expression was gradually upregulated,Bcl-2 expression was downregulated,and caspase-9 and caspase-3 were ***,the intrinsic apoptotic pathway may be involved in ART-induced *** cycle analysis by flow cytometry indicated that ART may induce cell cycle arrest at G2 /M *** nude mice bearing HOS xenograft tumours,ART inhibited tumour growth and regulated the expressions of cleaved caspase-3 and survivin,in agreement with in vitro *** has a selective antitumour activity against human osteosarcoma HOS cells,which may be related to its effects on induction of apoptosis via the intrinsic *** results suggest that ART is a promising candidate for the treatment of osteosarcoma.

关键词： Artesunate Human osteosarcoma HOS cells Apoptosis Cell cycle Nude mice Chemotherapy

High quality Sb-doped SnO2 electrodes with high oxygen evolution potential prepared by in situ hydrothermal synthesis method

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Chinese Chemical Letters 2007年第8期18卷 997-1000页

作者： Ai Sheng Huang Guo Hua zhao Hong xu li Department of Chemistry Tongji University Shanghai 200092 China

High quality Sb-doped SnO2 electrode, with high oxygen evolution potential of 3.0 V, was successfully synthesized on the Ti substrates by in situ hydrothermal synthesis method.

关键词： Metallic oxide electrode Hydrothermal synthesis Oxygen evolution reaction

Theoretical Design of Defects as a Driving Force for Ion Transport in li_(3)OBr Solid Electrolyte

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Energy & Environmental Materials 2024年第3期7卷 143-153页

作者： Xingyun Luo Yanlu li Xian zhao State Key Lab of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China Center for Optics Research and Engineering Shandong UniversityQingdao 266237China

Due to ever-increasing concerns about safety issues in using li ionic batteries,solid electrolytes have extensively *** li-rich antiperovskite li_(3)OBr has been considered as a promising solid electrolyte candidate,but it still suffers challenges to achieve a high ionic conductivity owing to the high intrinsic symmetry of the crystal ***,we presented a design strategy that introduces various point defects and grain boundaries to break the high lattice symmetry of li_(3)OBr crystal,and their effect and microscopic mechanism of promoting the migration of li-ion were explored *** has been found that li_(i)are the dominant defects responsible for the fast li-ion diffusion in bulk li_(3)OBr and its surface,but they are easily trapped by the grain boundaries,leading to the annihilating of the Frenkel defect pair V'_(li)+li_(i),and thus limits the V'_(li)diffusion at the grain *** V_(Br)defect near the grain boundaries can effectively drive V'_(li)across the grain boundary,thereby converting the carrier of li^(+)migration from li,in the bulk and surface to V'_(li)at the grain boundary,and thus improving the ionic conductivity in the whole li_(3)OBr *** work provides a comprehensive insight into the li^(+)transport and conduction mechanism in the li_(3)OBr *** opens a new way of improving the conductivity for all-solid-state li electrolyte material through the defect design.

关键词： defects density functional theory ionic migration solid electrolyte

A linkable signature scheme supporting batch verification for privacy protection in crowd-sensing

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Digital Communications and Networks 2024年第3期10卷 645-654页

作者： xu li Gwanggil Jeon Wenshuo Wang Jindong zhao School of Computer and Control Engineering Yantai UniversityYantai264005China Department of Embedded Systems Engineering Incheon National UniversityAcademyro-119Incheon22012Republic of Korea

The maturity of 5G technology has enabled crowd-sensing services to collect multimedia data over wireless network,so it has promoted the applications of crowd-sensing services in different fields,but also brings more privacy security challenges,the most commom which is privacy *** a privacy protection technology combining data integrity check and identity anonymity,ring signature is widely used in the field of privacy ***,introducing signature technology leads to additional signature verification *** the scenario of crowd-sensing,the existing signature schemes have low efficiency in multi-signature ***,it is necessary to design an efficient multi-signature verification scheme while ensuring *** this paper,a batch-verifiable signature scheme is proposed based on the crowd-sensing background,which supports the sensing platform to verify the uploaded multiple signature data efficiently,so as to overcoming the defects of the traditional signature scheme in multi-signature *** our proposal,a method for linking homologous data was presented,which was valuable for incentive mechanism and data *** results showed that the proposed scheme has good performance in terms of security and efficiency in crowd-sensing applications with a large number of users and data.

关键词： 5G network Crowd-sensing Privacy protection Ring signature Batch verification

Evolution of inner wall wrinkle defects in the sinking zone of a thick-walled steel tube during radial forging

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Advances in Manufacturing 2024年第2期12卷 396-408页

作者： Yu-zhao Yang Cheng xu li-Xia Fan School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094People’s Republic of China

An axial wrinkle defect was observed in the inner wall of the sinking zone of a thick-wall steel tube processed by cold radial *** can evolve into *** present study focuses on the evolution of wrinkles and the effects of process parameters on them using a three-dimensional radial forging process finite element model,radial forging experiments,and surface morphology *** results indicated that the vertical section angle of the hammer die and the size of the tube blank significantly affect the evolution of *** height-to-width ratioλwas introduced to describe the morphology of *** had an approximately linear relationship with the radius reduction in the sinking *** was a linear correlation between the growth slope ofλand the axial to circumferential strain ratio|εr/εθ|,which can predict theλunder few process *** the 30SiMn2MoVA steel,at the junction of the forging and sinking zones,the threshold ofλof the wrinkle that can evolve into a fissure is approximately 1.123.

关键词： Radial forging Inner wall Wrinkle defects Evolution Sinking zone

IQABC-Based Hybrid Deployment Algorithm for Mobile Robotic Agents Providing Network Coverage

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Tsinghua Science and Technology 2024年第2期29卷 589-604页

作者： Shuang xu Xiaojie liu Dengao li Jumin zhao College of Computer Science and Technology(College of Data Science) Taiyuan University of TechnologyTaiyuan 030024China Pengcheng Laboratory Shenzhen 518055China College of Information and Computer Taiyuan University of TechnologyTaiyuan 030024China

Working as aerial base stations,mobile robotic agents can be formed as a wireless robotic network to provide network services for on-ground mobile devices in a target ***,a challenging issue is how to deploy these mobile robotic agents to provide network services with good quality for more users,while considering the mobility of on-ground *** this paper,to solve this issue,we decouple the coverage problem into the vertical dimension and the horizontal dimension without any loss of optimization and introduce the network coverage model with maximum coverage ***,we propose a hybrid deployment algorithm based on the improved quick artificial bee *** algorithm is composed of a centralized deployment algorithm and a distributed *** proposed deployment algorithm deploy a given number of mobile robotic agents to provide network services for the on-ground devices that are independent and identically *** results have demonstrated that the proposed algorithm deploys agents appropriately to cover more ground area and provide better coverage uniformity.

关键词： wireless robotic networks network coverage deployment algorithm improved quick artificial bee colony

Broadband intelligent programmable metasurface with polarization-modulated self-adaptive electromagnetic functionality switching

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Photonics Research 2024年第7期12卷 1395-1409页

作者： XIMING li RUI xu XIAOFENG SUN YUAN zhao zhao YANG GUOHONG DU College of Electronic Engineering Chengdu University of Information TechnologyChengdu 610225China

Programmable metasurfaces have received a great deal of attention due to their ability to dynamically manipulate electromagnetic(EM) waves. Despite the rapid growth, most of the existing metasurfaces require manual control to switch among different functionalities, which poses severe limitations on practical applications. Here, we put forth an intelligent metasurface that has self-adaptive EM functionality switching in broadband without human participation. It is equipped with polarization discrimination antennas(PDAs) and feedback components to automatically adjust functionalities for the different incident polarization information.

关键词： equipped adjust polarization

Singularity analysis and avoidance for an SSRMS-type reconfigurable space manipulator with a non-spherical wrist and two lockable passive telescopic links

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Chinese Journal of Aeronautics 2024年第8期37卷 435-459页

作者： Zhiyuan zhao Xiaohang YANG Yuntao li Zichun xu Jingdong zhao Hong liU State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China

This study focuses on addressing kinematic singularity analysis and avoidance issues for a space station remote manipulator system(SSRMS)-type reconfigurable space *** manipulator is equipped with a non-spherical wrist and two lockable passive telescopic links(LPTLs),which enable it to have both active revolute and passive prismatic joints and operate in two distinct *** begin with the kinematic singularity analysis,the study derives the differential kinematic equations for the manipulator and identifies the dominant Jacobian matrix that causes ***,an in-depth analysis of singularities from multiple perspectives is ***,a kinematic singularity map method is proposed to capture the distribution of singularities within the reachable ***,the influence of the two LPTLs on singularities is thoroughly ***,a new method based on the matrix rank equivalence principle is introduced to determine singularity conditions,enabling the identification of all the singular configurations for the SSRMS-type reconfigurable ***,this method significantly reduces computational complexity,and the singularity conditions obtained have more concise *** the singularity avoidance problem,a novel method is developed,which simultaneously addresses the requirements of real-time performance,high precision,and the avoidance of both kinematic singularities and joint limit *** from these excellent properties,the proposed method can effectively resolve the singularity issues encountered separately by the SSRMS-type reconfigurable manipulator in its two operational *** typical simulations validate the utility of all the proposed methods.

关键词： Reconfigurable space manipulator Redundant manipulator Kinematics Singularity analysis Singularity avoidance