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基于梯度方向直方图的热核特征提取方法

仪器仪表学报 2017年第4期38卷 844-852页

作者：曾慧李斯琦汪慧娟刘冀伟北京科技大学自动化学院北京100083

提出了一种适用于描述非刚性三维模型局部表面结构的特征提取方法,即基于梯度方向直方图的热核特征(HOGHKS)提取方法。该方法首先提取具有等距不变性的三维点热核信号,可以使后续提取的特征向量具有等距不变性和较好的稳定性;然后对热... 详细信息

提出了一种适用于描述非刚性三维模型局部表面结构的特征提取方法,即基于梯度方向直方图的热核特征(HOGHKS)提取方法。该方法首先提取具有等距不变性的三维点热核信号,可以使后续提取的特征向量具有等距不变性和较好的稳定性;然后对热核信号的对数差分值进行梯度方向直方图统计,可以使构造出的特征向量对三维模型的尺度变化具有一定的不变性。该特征在一定程度上解决了HKS特征不具有尺度不变性、SI-HKS特征虽然具有尺度不变性但是需要将热核信号转换到频域进行描述会丢失一部分有效描述信息的问题。实验结果表明,与HKS特征和SI-HKS特征相比,HOG-HKS特征具有更好的检索效果。

关键词：非刚性三维模型三维模型检索热核特征具有尺度不变性的热核特征基于梯度方向直方图的热核特征

Jagged-1 signaling suppresses IL-6 plus TGF-β-induced Th17 cell differentiation via reduction of RORγt/IL-17A/IL-17F/IL-23a

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Jagged-1 signaling suppresses IL-6 plus TGF-β-induced Th17 ...

第九届全国免疫学学术大会

作者： Yuan Wang Yuhua Ji Jia Xiao Pengtao You siqi Ye Xiaoyan Wang Jingfang Di Shan zeng Jing Liu Feiyue Xing Institute of Tissue Transplantation and Immunology Department of ImmunobiologyJinan University

Background:Notch signaling involves T cell ***,little is known about Thl7 polarization and its mechanistic ***:The aim of this study was to identify genes influencing Thl7 cell differentiation by Jagged-1-Notch ***:So...

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No tillage outperforms conventional tillage under arid conditions and following fertilization

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Soil Ecology Letters 2023年第1期5卷 137-141页

作者： Stavros D.Veresoglou Junjiang Chen Xuheng Du Qi Fu QingLiu Geng Chenyan Huang Xilin Huang Nan Hu Yiming Hun Guolin C.Li Zhiman Lin Zhiyu Ma Yuyi Ou Shuo Qi Haitian Qin Yingbo Qiu Xibin Sun Ye Tao YiLing Tian Jie Wang Lingxiao Wu Ziwei Wu siqi Xie Ao Yang Dan Yang Chen zeng Ying zeng RuJie Zhang School of Ecology Sun Yat-sen UniversityGuangzhou 510006China

Reduced tillage practices present a tool that could sustainably intensify *** existing literature,however,lacks a consensus on how and when reduced tillage practices should get *** reanalyzed here an extensive dataset comparing how regular tillage practices(i.e.,conventional tillage)impacted yield of eight crops compared to stopping tillage altogether(i.e.,no-tillage practice).We observed that aridity and fertilization favored no tillage over conventional tillage whereas conventional tillage performed better under high fertility *** further show that the responses are consistent across the *** reanalysis complements the original and fills a gap in the literature questioning the conditions under which reducing tillage presents a viable alternative to common tillage practices.

关键词： Aridity Crop production Soil erosion Sustainable agriculture Tillage practices

Novel TM-loaded selenium nanoparticle SeNPs@TM enhances anticancer efficacy by the activation of cyclin-dependent kinaseinhibiting proteins and apoptotic signaling

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Novel TM-loaded selenium nanoparticle SeNPs@TM enhances anti...

第九届全国免疫学学术大会

作者： Yu Xia Pengtao You Jia Xiao Yuhua Ji Xiaoyan Wang Yi Lv Zhiwei Zhou siqi Ye Chong zeng Jingfang Di Shan zeng Fangfang Xu Jing liu Feiyue Xing Institute of Tissue Transplantation and Immunology Department of ImmunobiologyJinan University

Background:Selenium(Se)nanomaterials have attracted increasing attention for their unique characteristics and potential applications in biological *** recent years,considerable studies have focused on preparation of Se nanoparticles(SeNPs).SeNPs as delivery vehicles of anticancer drugs has enormous advantages,including targeting action

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Hes-1 contributes to dendritic cells-mediated inhibition of Th17 cell skewing by Jagged-1 signaling

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Hes-1 contributes to dendritic cells-mediated inhibition of ...

第九届全国免疫学学术大会

作者： Pengtao You Yuan Wang Jia Xiao Yuhua Ji siqi Ye Chong zeng Yu Xia Zhiwei Zhou Yi Lv Xiaoyan Wang Jingfang Di Shan zeng Jing liu Feiyue Xing Institute of Tissue Transplantation and Immunology Department of ImmunobiologyJinan University

Background:Th17 cells are characterized by the production of IL-17A(interleukin 17A),IL-17F,IL-6,TNF-α,IL-21and IL-22 as characteristic cytokines,which play a central role in protection from bacterial and fungal infection,inflammation and autoimmune diseases,such as psoriasis,rheumatoid arthritis,multiple sclerosis and asthma.

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基于零序电流幅值连调的小电流接地系统故障区段定位方法

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电力系统保护与控制 2021年第9期49卷 48-56页

作者：刘斯琪喻锟曾祥君刘战磊陈小平智能电网运行与控制湖南省重点实验室(长沙理工大学) 湖南长沙410114 长沙精科电力技术有限公司湖南长沙410114

为提高小电流接地系统中利用故障稳态特征实现故障定位方法的准确率和抗过渡电阻能力,提出基于零序电流幅值连调的单相接地故障区段定位方法。通过注入信号逐次调控中性点电压,结合各检测区段零序电流特征与过渡电阻、调控系数大小的关... 详细信息

为提高小电流接地系统中利用故障稳态特征实现故障定位方法的准确率和抗过渡电阻能力,提出基于零序电流幅值连调的单相接地故障区段定位方法。通过注入信号逐次调控中性点电压,结合各检测区段零序电流特征与过渡电阻、调控系数大小的关系,确定调控范围。不同程度地放大故障特征,获取零序电流幅值稳态量。通过叠加特征增强量与设定阈值比较,从而定位故障区段,并根据零序电流特征的变化趋势实现高阻故障区段判别。仿真结果表明该方法对于不同过渡电阻值均能准确定位故障区段,具有较强的适用性。

关键词：小电流接地系统零序电流调控系数过渡电阻故障定位

征收体制改革、养老保险缴费率下调空间与企业缴费负担

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经济科学 2020年第2期 74-86页

作者：曾益李晓琳杨思琦中南财经政法大学公共管理学院湖北武汉430073

《国税地税征管体制改革方案》指出今后我国社会保险费交由税务部门统一征收。当其他条件不变,征收体制改革可能会提高社会保险征缴率并增加企业缴费负担。那么,为对冲征收体制改革带来的企业负担,我国社会保险政策缴费率可否进一步降低... 详细信息

《国税地税征管体制改革方案》指出今后我国社会保险费交由税务部门统一征收。当其他条件不变,征收体制改革可能会提高社会保险征缴率并增加企业缴费负担。那么,为对冲征收体制改革带来的企业负担,我国社会保险政策缴费率可否进一步降低?本文以城镇职工基本养老保险为例,运用计量模型和精算模型,分析征收体制改革对社会保险政策缴费率下调空间的影响,研究发现:征收体制改革可使我国养老保险征缴率提高13.5个百分点;征缴率提升使养老保险基金收入增加,在确保基金收支平衡和养老金待遇不变的同时,养老保险政策缴费率在2019-2025年间可降至21.82%;与征收体制不变和未降低政策缴费率的情况相比,征收体制改革与降低政策缴费率可使企业缴费负担下降16.79%。综上所述,征收体制改革为降低我国养老保险政策缴费率创造了契机。可见,我国应稳步推进社会保险费征收体制改革,进一步降低社会保险政策缴费率,以达到减轻企业缴费负担、激发市场主体活力的目标。

关键词：征收体制改革养老保险缴费率企业负担政策模拟

全媒体整合效应下的全方位疫情信息传播——中央广播电视总台新冠肺炎疫情报道分析

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电视研究 2020年第3期 21-25页

作者：曾祥敏刘思琦中国传媒大学电视学院

2020年新冠肺炎疫情的信息传播是在移动社交传播语境下对主流媒体的考验,也是对总台全媒体整合后的全面检阅。此次报道中,总台在创新视听新场景、革新传播话语方式、推出融合新闻产品等方面呈现出较为突出的特点。本文以总台全媒体疫情... 详细信息

2020年新冠肺炎疫情的信息传播是在移动社交传播语境下对主流媒体的考验,也是对总台全媒体整合后的全面检阅。此次报道中,总台在创新视听新场景、革新传播话语方式、推出融合新闻产品等方面呈现出较为突出的特点。本文以总台全媒体疫情报道为案例,阐释了总台正向价值引导、回应社会关切和加强国际传播等多方实践,分析了总台搭建多场景覆盖、立体化传播、高质量刷屏全媒体矩阵的报道形式,同时对未来需提升的方面进行再思考。

关键词：中央广播电视总台新冠肺炎疫情报道全媒体传播

3D Printing of Nacre-Inspired Structures with Exceptional Mechanical and Flame-Retardant Properties

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Research 2022年第2期2022卷 191-202页

作者： Yang Yang Ziyu Wang Qingqing He Xiangjia Li Gengxi Lu Laiming Jjiang Yushun zeng Brandon Bethers Jie Jin Shuang Lin siqi Xiao Yizhen Zhu Xianke Wu Wenwu Xu Qiming Wang Yong Chen Department of Mechanical Engincering.San Diego State University 5500 Campanie DriveSar DiegoCA 92182.USA The Institute of Techrrological Sciences Wuhan UniversityWuhan 430072China School for Enginering of MatterTransport and EnergyArizona State Universiy551 E Tyler MallTempe.AZ 85281USA Department of Biomedical Engincering University of Southern alifrnia1042 Downey WayLos AngelesCA 90089USA Epstein Department of Indusria and Systems Engineering University of Southern Califomnia 3715 McClinock AveLos AngelesCA 90089USA ShadeCraft Robotics Inc.Pasadena CA 91105USA Department of Chemical Engineering and Materials Science University of Southen Calfornian925 Bloom WalkLos AngelesCaliformia 90089USA Deparment of Aerospace and Mechanical Engineering University of Southern CaliforniaLos AngelesCA 9008%.USA 9School of Physics and TechnologyWuhan UniversilyWuhan 430072China School of Physics and Technology Wuhan UniversityWuhan 430072China Sonny Aslani Department of Civil and Enwiromental Engineering University of Southern CaliforniaLos AngelesCA 90089USA

Flame-retardant and thermal management structures have attracted great attention duc to the requirement of high-temperature exposure in industrial,aerospace,and thermal power fields,but the development of protoctive fire-retardant structures with complex shapes to fit arbitrary surfaces is still ***,we reported a rotation-blade casting-assisted 3D printing process to fabricate nacre-inspired structures with exceptional mechanical and flame-retardant properties,and the relatedi fundamental mechanisms are studied.3-(Trimethoxysilyl)propyl methacrylate(TMSPMA)modified boron nitride nanoplatelets(BNs)were aligned by rotation-blade casting during the 3D printing process to build the"hrick and mortar"*** 3D printed structures are more lightweight,while having higher fracture toughness than the natural nacre,which is attributed to the crack deflection,aligned BN(a-BNs)bridging,and pull-outs reinforced structures by the covalent bonding between TMSPMA grafted a-BNs and polymer *** conductivity is enhanced by 25.5 times compared with pure polymer and 5.8 times of anisotropy due to the interconnection of a-BNs.3D printed heat-exchange structures with vertically aligned BNs in complex shapes were demonstrated for efficient thermal control of high-power light-emitting diocles.3D printed helmet and armor with a-BNs show exceptional mechanical and fire-retardant properties,demonstrating integrated mechanical and thermal protection.

关键词： toughness exceptional blade