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以可解释工具重探基于深度学习的谣言检测

数据分析与知识发现 2024年第4期8卷 1-13页

作者：贺国秀任佳渝李宗耀林晨曦蔚海燕华东师范大学经济与管理学院上海200062

【目的】探究基于内容的深度谣言检测模型能否真正识别谣言的关键语义。【方法】基于谣言检测任务的中英文基准数据集,本文分别利用基于局部代理模型的可解释工具liME和基于合作博弈论的可解释工具SHAP,分析BERT模型所识别出的关键特征... 详细信息

【目的】探究基于内容的深度谣言检测模型能否真正识别谣言的关键语义。【方法】基于谣言检测任务的中英文基准数据集,本文分别利用基于局部代理模型的可解释工具liME和基于合作博弈论的可解释工具SHAP,分析BERT模型所识别出的关键特征,并判断其是否能反映谣言特性。【结果】可解释工具在不同模型与数据集上计算得出的关键特征差异性较大,无法辨别模型识别的重要特征和谣言之间的语义关系。【局限】本文验证的数据集和模型数量都十分有限。【结论】基于深度学习的谣言检测模型仅拟合了训练集的特征,面向多样的真实场景缺少足够的泛化性和可解释性。

关键词：谣言检测可解释机器学习深度学习 liME SHAP

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节能降耗中热能与动力工程实际应用

电力设备管理 2024年第5期 240-242页

作者：李宗耀内蒙古电力燃料有限责任公司

在国民经济不断提高的同时,一些产业也存在着产能过剩。特别是在工业领域,能源的消耗非常普遍。在电力生产的过程中,能源损耗尤其重要,如何将热能与动力工程学有机地融合,推动新一代电力事业的发展、降低能耗、提高企业的经济效益,是各... 详细信息

在国民经济不断提高的同时,一些产业也存在着产能过剩。特别是在工业领域,能源的消耗非常普遍。在电力生产的过程中,能源损耗尤其重要,如何将热能与动力工程学有机地融合,推动新一代电力事业的发展、降低能耗、提高企业的经济效益,是各产业亟待解决的重要课题。在这种情况下,本文着重对热能与动力工程的基础应用关系进行了说明,并对其具体的应用进行了分析,对其在生产流程中存在的缺陷及降低能耗的途径进行了探讨。

关键词：节能降耗热能动力工程理论应用

淤地坝坝地有机碳空间分布及其对流域土地利用的响应

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水土保持通报 2024年第3期44卷 379-389页

作者：孙睿哲韩剑桥李宗遥刘子涵中国科学院教育部水土保持与生态环境研究中心陕西杨凌712100 中国科学院水利部水土保持研究所陕西杨凌712100 中国科学院大学北京100049 西北农林科技大学水土保持科学与工程学院陕西杨凌712100

[目的]淤地坝以直接拦截泥沙的方式治理水土流失,显著改变土壤有机碳(SOC)的横向迁移过程。分析淤地坝坝地内SOC的空间分布特征及流域土地利用对坝地浅土层(0—200 cm)内SOC分布的影响,为淤地坝建设与流域生态环境协同发展提供科学依据... 详细信息

[目的]淤地坝以直接拦截泥沙的方式治理水土流失,显著改变土壤有机碳(SOC)的横向迁移过程。分析淤地坝坝地内SOC的空间分布特征及流域土地利用对坝地浅土层(0—200 cm)内SOC分布的影响,为淤地坝建设与流域生态环境协同发展提供科学依据。[方法]以岔巴沟流域内3个土地利用类型差异较大(草地、坡耕地、梯田面积占比不同)的小流域为对象,采用遥感解译、野外采样与室内测试相结合的方法,研究坝地SOC空间分布特征及坝地表土层SOC对土地利用的响应关系。[结果](1)在垂直方向上,SOC在表层土(0—20 cm)含量最高,并随土层深度增加快速降低,深层SOC含量变化较小,在3.5 g/kg上下浮动。(2)在顺水流方向上,因土壤侵蚀沉积特征等影响,SOC在坝地中、后段含量较高;在平行坝体方向上,两侧含量较高。(3)流域内梯田占比较高的B淤地坝,坝地SOC均值(4.4 g/kg)显著高于A淤地坝坝地(3.9 g/kg)和C淤地坝坝地(3.5 g/kg)。(4)流域内梯田的SOC最高,同时梯田建设影响了侵蚀泥沙的土壤粒径,从而使得流域内梯田占比与坝地表土层SOC呈显著正相关关系。草地表层SOC碳含量较低,使得坝地地表SOC含量与草地呈负相关关系。坡耕地SOC密度与坝地地表的SOC含量呈正相关关系,但由于坡耕地面积较小,其占比与坝地地表SOC无明显相关性。[结论]受土壤侵蚀、SOC来源和矿化特征影响,坝地表层土SOC最高,随土层深度增加快速降低并趋于稳定。梯田地类内的高SOC含量水平及较细颗粒的侵蚀土粒特征,导致了梯田占比最高的B淤地坝坝地内SOC含量最高。黄土丘陵沟壑区坝控流域内的梯田建设对淤地坝坝地SOC的正向响应。梯田及淤地坝不仅能够减少流域内的水土流失,同时还能够显著提高流域内土壤有机碳水平,改善流域微环境。

关键词：淤地坝 SOC 土地利用空间分布相关性分析

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风险分担机制下城市污水处理BOT项目特许定价研究

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北京工业职业技术学院学报 2024年第3期23卷 41-46页

作者：黄洵李宗耀四川开放大学四川成都610000 重庆大学重庆401331

特许定价在BOT项目中占据核心地位。为了降低城市污水处理BOT项目的管理风险,基于风险分担理论,深入探讨风险分担与绩效考核之间的逻辑关系及边界条件。针对社会资本承担的风险,通过将项目绩效考核与特许价格挂钩,提出基于项目绩效考核... 详细信息

特许定价在BOT项目中占据核心地位。为了降低城市污水处理BOT项目的管理风险,基于风险分担理论,深入探讨风险分担与绩效考核之间的逻辑关系及边界条件。针对社会资本承担的风险,通过将项目绩效考核与特许价格挂钩,提出基于项目绩效考核支付系数的特许定价模型,这不仅填补了相关研究的空白,也进一步完善了调价机制。通过项目实践验证,该模型在实际应用中取得了显著成效。

关键词：污水处理特许价格 BOT项目风险分担项目绩效考核

PETROGENETIC AND METALLOGENETIC AGES FOR THE PORPHYRY COPPER DEPOSITS IN THE GANGDISE METALLOGENIC BELT IN SOUTHERN TIBET

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Geotectonica et Metallogenia 2004年第2期28卷 118-127页

作者： li Guangming RUI zongyao Chengdu Institute of Geology and Mineral Resources Chengdu SC 610082China Institute of Mineral ResourcesChinese Academy of Geological Sciences Beijing100037China

Recent examination and assessment about the porphyry copper deposits in Gangdise metallogenic belt in southern Tibet have revealed that these porphyry copper deposits are highly prospective. Several methods have been used for the isotopic dating of the Qulong, Tinggong and Chongjiang porphyry copper deposits, which gives out a petrogenetic age of 17.58±0.74Ma (single-zircon dating of SHRIMP), a metallogenetic age of 15.99±0.32Ma (Re-Os isochron dating) and an alteration age ranging between 12.00Ma and 16.5Ma (K-Ar dating). The metallogenetic age is in general agreement with the alteration age. It can be seen that the petrogenetic and metallogenetic ages for the porphyry copper deposits in Gangdise metallogenic belt are noticeably later than the age for the collisional granitic intrusion in this belt. The authors contend that the porphyry copper deposits in the study area were formed in a post-collisional extensional tectonic setting, and are closely related to the delamination of the mountain roots of the orogenic belts and the uplifting of the Qinghai-Tibet Plateau.

关键词： Tibet Gangdise metallogenic belt porphyry copper deposit isotopic dating significance

Feature extraction of gear-localized defect using adaptive lifting scheme and local gradient maps

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Engineering Sciences 2013年第1期11卷 78-82,88页

作者： Zhang Lu Zhao Hong li Zhen Qi Keyu li zongyao Yao Nianling State Key Lab oratory for Manufacturing Systems Engineering Xi'an Jiaotong University Tiandi (Changzhou) Automation Co. Ltd. Science and Technology on Electromechanical Dynamic Control Laboratory The Fourth Military Medical University Xijing Hospital

In this paper,the adaptive lifting scheme (ALS) and local gradient maps (LGM) are proposed to isolate the transient feature components from the gearbox vibration signals. Based on entropy minimization rule,the ALS is employed to change properties of an initial wavelet and design adaptive wavelet. Then LGM is applied to characterize the transient feature components in detail signal of decomposition results using ALS. In the present studies, the orthogonal Daubechies 4 (Db 4) wavelet is used as the initial wavelet. The proposed method is applied to both simulated signals and vibration signals acquired from a gearbox for periodic impulses detection. The two conventional methods (cepstrum analysis and Hilbert envelope analysis) and the orthogonal Db4 wavelet are also used to analyze the same signals for comparison. The results demonstrate that the proposed method is more effective in extracting transient components from noisy signals.

关键词： adaptive lifting scheme local gradient maps gearbox fault detection

A Hierarchical Method for Locating the Interferometric Fringes of Celestial Sources in the Visibility Data

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Research in Astronomy and Astrophysics 2024年第3期24卷 110-128页

作者： Rong Ma Ruiqing Yan Hanshuai Cui Xiaochun Cheng Jixia li Fengquan Wu zongyao Yin Hao Wang Wenyi Zeng Xianchuan Yu School of Artificial Intelligence Beijing Normal UniversityBeijing 100875China Department of Computer Science Swansea UniversitySwanseaSA18ENUK National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

In source detection in the Tianlai project,locating the interferometric fringe in visibility data accurately will influence downstream tasks drastically,such as physical parameter estimation and weak source *** that traditional locating methods are time-consuming and supervised methods require a great quantity of expensive labeled data,in this paper,we first investigate characteristics of interferometric fringes in the simulation and real scenario separately,and integrate an almost parameter-free unsupervised clustering method and seeding filling or eraser algorithm to propose a hierarchical plug and play method to improve location ***,we apply our method to locate single and multiple sources’interferometric fringes in simulation ***,we apply our method to real data taken from the Tianlai radio telescope ***,we compare with unsupervised methods that are state of the *** results show that our method has robustness in different scenarios and can improve location measurement accuracy effectively.

关键词： methods data analysis-techniques image processing-techniques interferometric

Effect of external magnetic field on the instability of THz plasma waves in nanoscale graphene field-effect transistors

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Chinese Physics B 2024年第4期33卷 683-689页

作者：张丽萍孙宗耀李佳妮苏俊燕 School of Sciences Lanzhou University of TechnologyLanzhou 730050China

The instability of plasma waves in the channel of field-effect transistors will cause the electromagnetic waves with THz *** on a self-consistent quantum hydrodynamic model,the instability of THz plasmas waves in the channel of graphene field-effect transistors has been investigated with external magnetic field and quantum *** analyzed the influence of weak magnetic fields,quantum effects,device size,and temperature on the instability of plasma waves under asymmetric boundary conditions *** results show that the magnetic fields,quantum effects,and the thickness of the dielectric layer between the gate and the channel can increase the radiation ***,we observed that increase in temperature leads to a decrease in both oscillation frequency and instability *** numerical results and accompanying images obtained from our simulations provide support for the above conclusions.

关键词： graphene field-effect transistors external magnetic field radiation frequency instability increment

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试析海事与刑事交叉案件的审理机制

试析海事与刑事交叉案件的审理机制