检索结果-南通市图书馆

Journal of Systems Engineering and Electronics 2024年第1期35卷 24-30页

作者： tian Jing ZHANG Wei School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China National Key Laboratory of Electromagnetic Space Security Chengdu 610036China

In engineering application,there is only one adaptive weights estimated by most of traditional early warning radars for adaptive interference suppression in a pulse reputation interval(PRI).Therefore,if the training samples used to calculate the weight vector does not contain the jamming,then the jamming cannot be removed by adaptive spatial *** the weight vector is constantly updated in the range dimension,the training data may contain target echo signals,resulting in signal cancellation *** cope with the situation that the training samples are contaminated by target signal,an iterative training sample selection method based on non-homogeneous detector(NHD)is proposed in this paper for updating the weight vector in entire range *** principle is presented,and the validity is proven by simulation results.

关键词： adaptive radar beamforming training sample selection non-homogeneous detector electronic jamming jamming suppression

在线全文

学校读者我要写书评

暂无评论

俄罗斯国家形象在网络空间的塑造与传播

西伯利亚研究 2021年第4期48卷 31-48页

作者：田凤娟北京邮电大学马克思主义学院

以苏联解体为标志的两极格局瓦解后,国际关系领域传统的意识形态战逐渐被国家形象战替代。国家形象博弈不仅体现在现实空间的政治、经济、文化以及军事等领域,在虚拟的网络空间里同样进行着激烈的国家形象角逐。俄罗斯国家形象在网络空... 详细信息

以苏联解体为标志的两极格局瓦解后,国际关系领域传统的意识形态战逐渐被国家形象战替代。国家形象博弈不仅体现在现实空间的政治、经济、文化以及军事等领域,在虚拟的网络空间里同样进行着激烈的国家形象角逐。俄罗斯国家形象在网络空间的塑造力和传播力强劲。借助于网络空间,俄国家形象不仅不断改善和提升,而且还开启了改变世界媒体话语权格局的革命,第一次在真正意义上降低了西方媒体在公众眼中的信任度。在国家硬实力无明显提升甚或有一定程度下滑的背景下,俄罗斯国家形象能够"逆势上扬",归根结底源于对网络空间内容逻辑和传播逻辑的遵循。提炼俄罗斯在网络空间塑造与传播国家形象的逻辑,可以为中国国家形象的塑造与传播提供更多元的视角和有益的参考。

关键词：网络空间俄罗斯国家形象

人工智能伦理教育融入高校思想政治理论课初探

在线全文

学校读者我要写书评

暂无评论

北京邮电大学学报（社会科学版） 2021年第4期23卷 104-110页

作者：田凤娟北京邮电大学马克思主义学院北京100876

高速发展的新一代人工智能成为第四次工业革命的重要变革力量,不仅深刻地改变了人的生活方式,还对社会的发展提出了前所未有的伦理挑战。在人工智能伦理的研究和教育中,不仅要关注学理性和应用性,更要关注人工智能作为进步科技所具有的... 详细信息

高速发展的新一代人工智能成为第四次工业革命的重要变革力量,不仅深刻地改变了人的生活方式,还对社会的发展提出了前所未有的伦理挑战。在人工智能伦理的研究和教育中,不仅要关注学理性和应用性,更要关注人工智能作为进步科技所具有的政治性、历史性、社会性和价值性。从马克思主义的基本立场观点方法出发,充分发挥思想政治理论课对时代前沿问题的引领性,将人工智能伦理教育精准切入到课堂教学中,正本清源、明辨是非,用马克思主义科学的世界观和方法论引领人工智能伦理构建,形成中国特色的人工智能伦理教育体系,进一步强化大学生人工智能伦理意识,实现人、人工智能、社会和自然的和谐发展。

关键词：人工智能人工智能伦理教育思想政治理论课中国特色

CCL9/CCR1 axis-driven chemotactic nanovesicles for attenuating metastasis of SMAD4-deficient colorectal cancer by trapping TGF-β

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2024年第8期14卷 3711-3729页

作者： Boning Niu tianyi tian Lu Wang Yinmei tian tian tian Yuanyuan Guo Hu Zhou Zhiping Zhang Tongji School of Pharmacy Huazhong University of Science and TechnologyWuhan 430030China Department of Oncology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Pharmacy Liyuan HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China School of Pharmaceutical Sciences Fujian Provincial Key Laboratory of Innovative Drug Target ResearchHigh Throughput Drug Screening PlatformXiamen UniversityXiamen 361102China National Engineering Research Center for Nanomedicine Huazhong University of Science and TechnologyWuhan 430030China Hubei Engineering Research Centre for Novel Drug Delivery System Huazhong University of Science and TechnologyWuhan 430030China

SMAD4 deficiency in colorectal cancer(CRC)is highly correlated with liver metastasis and high mortality,yet there are few effective precision therapies ***,we show that CCR1^(+)-granulocytic myeloid-derived suppressor cells(G-MDSCs)are highly infiltrated in SMAD4-deficient CRC via CCL15/CCR1 and CCL9/CCR1 axis in clinical specimens and mouse models,*** excessive TGF-β,secreted by tumor-infiltrated CCR1^(+)-G-MDSCs,suppresses the immune response of cytotoxic T lymphocytes(CTLs),thus facilitating ***,we develop engineered nanovesicles displaying CCR1 and TGFBR2 molecules(C/T-NVs)to chemotactically target the tumor driven by CCL9/CCR1 axis and trap TGF-βthrough TGF-β-TGFBR2 specific *** C/T-NVs counteract CCR1^(+)-G-MDSC infiltration through competitive responding CCL9/CCR1 axis.C/T-NVs-induced intratumoral TGF-βexhaustion alleviates the TGF-β-suppressed immune response of ***,C/T-NVs attenuate liver metastasis of SMAD4-deficient *** further exploration,high expression of programmed cell death ligand-1(PD-L1)is observed in clinical specimens of SMAD4-deficient *** C/T-NVs with anti-PD-L1 antibody(aPD-L1)induces tertiary lymphoid structure formation with sustained activation of CTLs,CXCL13^(+)-CD4^(+)T,CXCR5^(+)-CD20^(+)B cells,and enhanced secretion of cytotoxic cytokine interleukin-21 and IFN-γaround tumors,thus eradicating metastatic *** strategy elicits pleiotropic antimetastatic immunity,paving the way for nanovesicle-mediated precision immunotherapy in SMAD4-deficient CRC.

关键词： SMAD4-deficient CRC Metastasis G-MDSCs TGF-β CCR1 TGFBR2

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

重视自我意识特点,促进初中生自我教育

厦门教育学院学报 2006年第4期8卷 58-60页

作者：田凤娟西南大学教育科学研究所重庆400715

心理学家认为,少年期是人生的危险期。这个时期由于初中生生理上的变化,他们的内心世界也开始发生巨大变化。这个时期初中学生的教育,比小学阶段更为困难和复杂。因此,我们应该重视他们内心发展的特点。本文从心理因素对自我教育的影响... 详细信息

心理学家认为,少年期是人生的危险期。这个时期由于初中生生理上的变化,他们的内心世界也开始发生巨大变化。这个时期初中学生的教育,比小学阶段更为困难和复杂。因此,我们应该重视他们内心发展的特点。本文从心理因素对自我教育的影响出发,首先对初中生的心理发展特点,特别是自我意识的发展特点,作了理论探讨,然后从自我认知、自我体验、自我评价和自我控制等方面积极构建自我教育模式,引导初中生进行自我教育,促进他们的全面和谐的发展和健康成长。

关键词：初中生自我意识自我教育

DeepSI:A Sensitive-Driven Testing Samples Generation Method of Whitebox CNN Model for Edge Computing

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2024年第3期29卷 784-794页

作者： Zhichao Lian Fengjun tian School of Cyber Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China

In recent years,Deep Learning(DL)technique has been widely used in Internet of Things(IoT)and Industrial Internet of Things(IIoT)for edge computing,and achieved good *** more and more studies have shown the vulnerability of neural ***,it is important to test the robustness and vulnerability of neural *** specifically,inspired by layer-wise relevance propagation and neural network verification,we propose a novel measurement of sensitive neurons and important neurons,and propose a novel neuron coverage criterion for robustness *** on the novel criterion,we design a novel testing sample generation method,named DeepSI,which involves definitions of sensitive neurons and important ***,we construct sensitive-decision paths of the neural network through selecting sensitive neurons and important ***,we verify our idea by setting up several experiments,then results show our proposed method achieves superior performances.

关键词： neuron sensitivity Layer-wise Relevance Propagation(LRP) neural network verification deeplearning testing

高职院校护理专业学生积极心理资本在专业认同与学习倦怠间的中介作用

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中华行为医学与脑科学杂志 2018年第9期27卷 839-842页

作者：蒋继国田凤娟菏泽医学专科学校心理学教研室菏泽274000

目的探讨高职院校护理专业学生积极心理资本在专业认同和学习倦怠关系中的中介作用。方法运用专业认同问卷、积极心理资本问卷和大学生学习倦怠量表对某地区高职院校627名护理专业学生进行调查。结果不同性别学生专业认同总分及认知性... 详细信息

目的探讨高职院校护理专业学生积极心理资本在专业认同和学习倦怠关系中的中介作用。方法运用专业认同问卷、积极心理资本问卷和大学生学习倦怠量表对某地区高职院校627名护理专业学生进行调查。结果不同性别学生专业认同总分及认知性、情感性、适切性专业认同因子评分差异无统计学意义（均P〉0．05），但在行为性专业认同因子上，女生得分显著高于男生[（3．36±0．69）分，（3．20±0．76）分，t=-2．411，P〈0．05]，不同年级的专业认同总分及因子差异有统计学意义（F=9．490，P〈0．01）。积极心理资本与学习倦怠呈显著负相关（r=-0．533，P〈0．01），专业认同度与积极心理资本呈现显著正相关（r=0．474，P〈0．01），专业认同与学习倦怠呈现显著负相关（r=-0．540，P〈0．01）。积极心理资本在专业认同度与学习倦怠中起部分中介作用（β=-0．17，ab／c=0．46，95％CI=-0．23--0．13）。结论高职院校护理专业学生专业认同和积极心理资本对学习倦怠有重要预测作用，积极心理资本在专业认同和学习倦怠中起部分中介作用。

关键词：积极心理资本专业认同学习倦怠中介作用

Frequency Domain Fatigue Evaluation on SCR Girth-Weld Based on Structural Stress

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第2期38卷 255-270页

作者： ZHANG Long ZHAO tian-feng College of Safety and Ocean Engineering China University of Petroleum(Beijing)Beijing 102249China

The Steel Catenary Riser(SCR)is a vital component for transporting oil and gas from the seabed to the floating *** harsh environmental conditions and complex platform motion make the SCR’s girth-weld prone to fatigue *** structural stress fatigue theory and Master S-N curve method provide accurate predictions for the fatigue damage on the welded joints,which demonstrate significant potential and compatibility in multi-axial and random fatigue ***,we propose a new frequency fatigue model subjected to welded joints of SCR under multiaxial stress,which fully integrates the mesh-insensitive structural stress and frequency domain random process and transforms the conventional welding fatigue technique of SCR into a spectrum analysis technique utilizing structural ***,a full-scale FE model of SCR with welds is established to obtain the modal structural stress of the girth weld and the frequency response function(FRF)of modal coordinate,and a biaxial fatigue evaluation about the girth weld of the SCR can be achieved by taking the effects of multi-load correlation and pipe-soil interaction into *** research results indicate that the frequency-domain fatigue results are aligned with the time-domain results,meeting the fatigue evaluation requirements of the SCR.

关键词： SCR girth weld random vibration self(cross)power spectrum structural stress method biaxial fatigue damage

Frost heaving and crack initiation characteristics of tunnel rock mass in cold regions under low-temperature degradation

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2024年第8期21卷 2844-2854页

作者： CHEN Wenhua XIANG tian School of Civil Engineering Beijing Jiaotong UniversityBeijing 202303China

Water freezing in rock fractures causes volumetric expansion and fracture development through frost *** study introduces a novel analytical model to investigate how uneven freezing force and surrounding rock pressure influence fracture initiation,based on mass conservation,elasticity,and water-ice phase transition principles.A model for rock fracture initiation considering freezing temperature,uneven freezing expansion,in-situ stress,and lateral pressure was proposed based on fracture *** for stress intensity factors were developed and validated using the phase field *** effects of rock elastic modulus anisotropy and critical fracture energy density on fracture initiation were also *** results show that the values of KI and KII exhibit an upward trend as the freezing temperature,uneven expansion,in-situ stress,and lateral pressure *** uneven freezing expansion has the most significant influence on KI and KII values among these *** the uneven freezing expansion coefficient increases to 0.5,the fracture initiation mode shifts from tensile fracture to shear *** the lateral pressure coefficient increases to 1,the fracture initiation mode shifts from tensile fracture to shear *** elastic modulus anisotropy causes fractures to propagate in a clockwise direction,forming a'butterfly'*** fracture energy density an isotropy causes counterclockwise deviation in propagation direction,resulting in branching paths and an'H'-shaped pattern.

关键词： Rock fractures Fracture water Uneven freezing expansion Phase field method Initiation angle Anisotropy

Numerical investigation on characteristics of interfacial wave of liquid film in gas-liquid two-phase flow using OpenFOAM

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第2期37卷 233-248页

作者： Xiaoqi MA Yueshe WANG Jiaming tian State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

Liquid film cooling as an advanced cooling technology is widely used in space *** operation of liquid film along the rocket combustion inner wall is crucial for thermal protection of rocket *** stability of liquid film is mainly determined by the characteristics of interfacial wave,which is rarely investigated right *** to improve the stability of thin film has become a hot *** view of this,an advanced model based on the conventional Volume of Fluid(VOF)model is adopted to investigate the characteristics of interfacial wave in gas-liquid flow by using OpenFOAM,and the mechanism of formation and development of wave is revealed intuitively through numerical *** effects from gas velocity,surface tension and dynamic viscosity of liquid(three factors)on the wave are studied *** can be found that the gas velocity is critical to the formation and development of wave,and four modes of droplets generation are illustrated in this ***,a gas vortex near the gas-liquid interface can induce formation of wave easily,so changing the gas vortex state can regulate formation and development of ***’s more,the change rules of three factors influencing on the interfacial wave are obtained,and the surface tension has a negative effect on the formation and development of wave only when the surface tension coefficient is above the critical value,whereas the dynamic viscosity has a positive effect in this ***,the maximum height and maximum slope angle of wave will level off as the gas velocity ***,the maximum slope angle of wave is usually no more than 38°,no matter what happens to the three factors.

关键词： Interfacial wave Gas-liquid Two-phase flow VOF model OpenFOAM