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Journal of Environmental Sciences 2024年第8期142卷 11-20页

作者： Guodong Zhao Chong Tian Peidong Wu Xuguang Zhang zhikang wang Xiaoxiang Chen Zhuo Xiong Yongchun Zhao Junying Zhang State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China National Environmental Protection Engineering Technology Center for Trace Elements Pollution Control and Low Carbon Utilization of Coal Huazhong University of Science and TechnologyWuhan 430074China School of Environmental Engineering Wuhan Textile UniversityWuhan 430200China

Chromium released during municipal solid waste incineration(MSWI)is toxic and carcinogenic.The removal of chromium from simulated MSWI flue gas by four sorbents(CaO,bamboo charcoal(BC),powdered activated carbon(PAC),and Al_(2)O_(3))and the effects of four oxides(SiO_(2),Al_(2)O_(3),Fe_(2)O_(3),and CaO)on chromium speciation transformationwere investigated.The results showed that the removal rates of total Cr by the four sorbents were Al_(2)O_(3)

关键词： Cr(Ⅵ)reduction Cr(Ⅲ)oxidation Alkali oxides Acidic oxides Municipal solid waste incineration

A Blockchain-Based Game Approach to Multi-Microgrid Energy Dispatch

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工程与科学中的计算机建模(英文) 2024年第1期138卷 845-863页

作者： zhikang wang Chengxuan wang Wendi Wu Cheng Sun Zhengtian Wu School of Electronic and Information Engineering Suzhou University of Science and TechnologySuzhou215123China

As the current global environment is deteriorating,distributed renewable energy is gradually becoming an important member of the energy internet.Blockchain,as a decentralized distributed ledger with decentralization,traceability and tamper-proof features,is an importantway to achieve efficient consumption andmulti-party supply of new energy.In this article,we establish a blockchain-based mathematical model of multiple microgrids and microgrid aggregators’revenue,consider the degree of microgrid users’preference for electricity thus increasing users’reliance on the blockchainmarket,and apply the one-master-multiple-slave Stackelberg game theory to solve the energy dispatching strategy when each market entity pursues the maximum revenue.The simulation results show that the blockchain-based dynamic game of the multi-microgrid market can effectively increase the revenue of both microgrids and aggregators and improve the utilization of renewable energy.

关键词： Multi-microgrid blockchain stackelberg game energy scheduling

Stability Investigation and Improvement for DC Cascade Systems with Simplified Impedance-based Stability Criterion

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1044-1052页

作者： Junbin Fang zhikang Shuai Yang Li Zhibing wang Xiangyang Wu Xia Shen Z.John Shen College of Electrical and Information Engineering Hunan UniversityChangsha 410082China Renewable Energy Department of China Electric Power Research Institute Beijing 100192China Department of Electrical and Computer Engineering Illinois Institute of TechnologyChicagoIL 60616USA IEEE

In DC distributed power systems(DPSs),the complex impedance interactions possibly lead to DC bus voltage oscillation or collapse.In previous research,the stability analysis of DPSs is implemented based on mathematical analysis in control theory.The specific mechanisms of the instability of the cascade system have not been intuitively clarified.In this paper,the stability analysis of DPSs based on the traditional Nyquist criterion is simplified to the resonance analysis of the seriesconnected port impedance(Z=R+jX)of source and load converters.It reveals that the essential reason for impedance instability of a DC cascade system is that the negative damping characteristic(R<0)of the port the overall impedance amplifies the internal resonance source at reactance zero-crossing frequency.The simplified stability criterion for DC cascade systems can be concluded as:in the negative damping frequency ranges(R<0),there exists no zero-crossing point of the reactance component(i.e.,X=0).According to the proposed stability criterion,the oscillation modes of cascade systems are classified.A typical one is the internal impedance instability excited by the negative damping,and the other one is that the external disturbance amplified by negativity in a low stability margin.Thus,the impedance reshaping method for stability improvement of the system can be further specified.The validity of the simplified criterion is verified theoretically and experimentally by a positive damping reshaping method.

关键词： DC cascaded system,impedance model impedance reconstruction stability criterion

Intelligent overheating fault diagnosis for overhead transmission line using semantic segmentation

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High Voltage 2024年第2期9卷 309-318页

作者： Xiangyu Yang Youping Tu zhikang Yuan Zhong Zheng Geng Chen Cong wang Yan Xu Beijing Key Laboratory of High Voltage and EMC North China Electric Power UniversityBeijingChina College of Electronic and Information Engineering Tongji UniversityShanghaiChina

The strain clamps and leading wires are important components that connect conductors on overhead transmission lines and conduct current.During operation,poor contact between these components can cause abnormal overheating,leading to electric failures and threatening power system reliability.Recently,the use of unmanned aerial vehicles equipped with infrared thermal imagers for strain clamp and leading wire maintenance has become increasingly popular.Deep learning-based image recognition shows promising prospects for intelligent fault diagnosis of overheating faults.A pre-treatment method is proposed based on dynamic histogram equalisation to enhance the contrast of infrared images.The DeepLab v3+network,loss function,and existing networks with different backbones are compared.The DeepLab v3+network with ResNet101 and convolutional block attention module added,and the Focal Loss function achieved the highest performance with an average pixel accuracy of 0.614,an average intersection over union(AIoU)of 0.567,an F1 score of 0.644,and a frequency weighted intersection over union of 0.594 on the test set.The optimised Atrous rates has increased the AIoU by 12.91%.Moreover,an intelligent diagnosis scheme for evaluating the defect state of the strain clamps and leading wires is proposed and which achieves a diagnostic accuracy of 91.0%.

关键词： union fault diagnosis

Post-transcriptional regulation of grain weight and shape by the RBP-A-J-K complex in rice

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Journal of Integrative Plant Biology 2024年第1期66卷 66-85页

作者： Ding Ren Hui Liu Xuejun Sun Fan Zhang Ling Jiang Ying wang Ning Jiang Peiwen Yan Jinhao Cui Jinshui Yang zhikang Li Pingli Lu Xiaojin Luo State Key Laboratory of Genetic Engineering and MOE Engineering Research Center of Gene Technology School of Life SciencesFudan UniversityShanghai 200438China State Key Laboratory of Crop Stress Adaptation and Improvement School of Life SciencesHenan UniversityKaifeng 475004China MOE Key Laboratory of Crop Physiology Ecology and Genetic Breeding College of AgronomyJiangxi Agricultural UniversityNanchang 330045China State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural Sciences(CAAS)Beijing 100081China College of Agronomy Anhui Agricultural UniversityHefei 230036China

RNA-binding proteins(RBPs)are components of the post-transcriptional regulatory system,but their regulatory effects on complex traits remain unknown.Using an integrated strategy involving map-based cloning,functional characterizations,and transcriptomic and population genomic analyses,we revealed that RBP-K(LOC_Os08g23120),RBP-A(LOC_Os11g41890),and RBP-J(LOC_Os10g33230)encode proteins that form an RBP-A-J-K complex that negatively regulates rice yield-related traits.Examinations of the RBP-A-J-K complex indicated RBP-K functions as a relatively non-specific RBP chaperone that enables RBP-A and RBP-J to function normally.Additionally,RBP-J most likely affects GA pathways,resulting in considerable increases in grain and panicle lengths,but decreases in grain width and thickness.In contrast,RBP-A negatively regulates the expression of genes most likely involved in auxin-regulated pathways controlling cell wall elongation and carbohydrate transport,with substantial effects on the rice grain filling process as well as grain length and weight.Evolutionarily,RBP-K is relatively ancient and highly conserved,whereas RBP-J and RBP-A are more diverse.Thus,the RBP-A-J-K complex may represent a typical functional model for many RBPs and protein complexes that function at transcriptional and post-transcriptional levels in plants and animals for increased functional consistency,efficiency,and versatility,as well as increased evolutionary potential.Our results clearly demonstrate the importance of RBP-mediated post-transcriptional regulation for the diversity of complex traits.Furthermore,rice grain yield and quality may be enhanced by introducing various complete or partial loss-of-function mutations to specific RBP genes using clustered regularly interspaced palindromic repeats(CRISPR)/CRISPR-associated protein 9 technology and by exploiting desirable natural tri-genic allelic combinations at the loci encoding the components of the RBP-A-J-K complex through marker-assisted selection.

关键词： GL11 grain weight and shape post-transcriptional regulation RNA-binding proteins

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基于固态断路器主动注入式直流故障测距方法

电工技术学报 2024年第8期39卷 2360-2370页

作者：王伟帅智康李杨何梨梨方辰晨湖南大学电气与信息工程学院长沙410082

随着直流配电网的快速发展与深化应用,准确可靠的故障测距技术对直流故障检修和恢复至关重要。该文提出一种基于固态断路器(SSCB)主动注入式直流故障测距方法。首先,利用SSCB开断主动注入不同脉冲宽度的信号,并检测注入脉冲首末端和反... 详细信息

随着直流配电网的快速发展与深化应用,准确可靠的故障测距技术对直流故障检修和恢复至关重要。该文提出一种基于固态断路器(SSCB)主动注入式直流故障测距方法。首先,利用SSCB开断主动注入不同脉冲宽度的信号,并检测注入脉冲首末端和反射波首末端的时间差作为注入波形传播时间间隔,能够减小采样频率带来的误差。然后,提取电缆线路电压线模量作为检测量,削弱正负极线路之间的耦合作用,获得稳定波速。最后,基于小波变换原理提出改进自适应模极大值方法来检测脉冲首末端时刻,减小噪声和过渡电阻对测距精度的影响。仿真结果表明,基于SSCB主动注入式测距方法在直流配电网单极接地和极间短路故障情况下均能够实现准确且快速的定位。

关键词：直流配电网故障测距固态断路器主动注入自适应模极大值

基于改进的IIE-SegNet的快速图像语义分割方法

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哈尔滨工程大学学报 2024年第2期45卷 314-323页

作者：李庆王宏健李本银肖瑶迟志康哈尔滨工程大学智能科学与工程学院黑龙江哈尔滨150001 烟台南山学院智能科学与工程学院山东烟台264000

针对IIE-SegNet计算复杂度高、计算量大等问题,本文提出一种基于IIE-SegNet的改进方法。编码结构中引入经ImageNet训练过的VGG16和多尺度空洞卷积空间金字塔池化来获得丰富的编码信息;解码结构中,设计全局加平均模块来解决IIE-SegNet计... 详细信息

针对IIE-SegNet计算复杂度高、计算量大等问题,本文提出一种基于IIE-SegNet的改进方法。编码结构中引入经ImageNet训练过的VGG16和多尺度空洞卷积空间金字塔池化来获得丰富的编码信息;解码结构中,设计全局加平均模块来解决IIE-SegNet计算量大的问题;研究Focal损失函数来解决正、负采样不平衡的问题。实验结果表明:与IIE-SegNet相比,本方法在PASCAL VOC 2012数据集上的语义分割速度更快,平均每次迭代快0.6 s左右,测试单张图像的时间平均减少了0.94 s;分割精度更高,MIoU提升了2.1%。在扩展的PASCAL VOC 2012(Exp-PASCAL VOC 2012)数据集上的语义分割速度更快,平均每次迭代快0.4 s左右,测试单张图像的时间平均减少了0.92 s;分割精度更高,MPA和MIoU分别提升了2.6%和2.8%,特别是对于小尺度目标分割边界更清晰,性能得到了很大的提升。

关键词：语义分割深度学习多尺度空洞卷积空间金字塔池化图像信息熵全局加平均 VGG16 IIE-SegNet

常压密闭微波消解-电感耦合等离子体质谱法测定磷矿石中的稀土元素

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岩矿测试 2024年第2期43卷 366-374页

作者：张楠郑智慷王家松曾江萍中国地质调查局天津地质调查中心天津300170 华北地质科技创新中心天津300170 中国地质调查局海岸带地质环境重点实验室天津300170

磷矿石中的稀土元素测定方法主要使用电感耦合等离子体质谱法(ICP-MS),样品处理方式主要采用敞口混合酸溶和碱熔。传统的酸溶和碱熔处理矿石样品时间较长,试剂加入量大,操作过程较为繁琐,且易造成环境污染。微波消解直接向样品释放能量... 详细信息

磷矿石中的稀土元素测定方法主要使用电感耦合等离子体质谱法(ICP-MS),样品处理方式主要采用敞口混合酸溶和碱熔。传统的酸溶和碱熔处理矿石样品时间较长,试剂加入量大,操作过程较为繁琐,且易造成环境污染。微波消解直接向样品释放能量,工作效率高,且易挥发元素被保留在消化溶液中,防止挥发造成结果偏差及环境污染。本文采用微波消解对磷矿石进行处理,并在二次消解过程中加入饱和硼酸络合溶矿过程中产生的不溶物氟化钙,在线加入铑和铼双内标的方式,建立了ICP-MS测定磷矿石中15种稀土元素的方法。结果表明:二次消解过程中加入饱和硼酸能有效地络合沉淀,彻底溶解样品,经上机测定后15种稀土元素的相对标准偏差(RSD)在0.68%~4.52%之间,回收率在93.1%~106.6%之间,方法检出限为0.003~0.029μg/g。选取两个磷矿石样品,用本方法与混合酸(盐酸-硝酸-氢氟酸-硫酸)酸溶方法进行对比试验,相对标准偏差在-5.82%~5.99%之间,表明本方法测定稀土元素是有效可行的。对于样品的前处理方法,酸溶、碱熔和微波消解都有各自的特点,微波密封消解能避免一些能形成易挥发组分的损失并且外源性污染少。本方法拓展了测定磷矿石中稀土元素的样品前处理方法,操作性强,是对现行方法的有益补充。

关键词：磷矿石稀土元素微波消解饱和硼酸络合电感耦合等离子体质谱法

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脓毒症相关性急性肾损伤患者3个月死亡风险列线图预测模型的建立与评价

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中华危重病急救医学 2024年第5期36卷 465-470页

作者：岳筱李志芳王蕾黄丽赵致慷王盼盼王硕龚喜云张澍王正斌郑州大学第一附属医院急诊医学部河南郑州450052

目的建立并评价脓毒症相关性急性肾损伤(S-AKI)患者3个月死亡风险的列线图预测模型。方法基于美国重症监护医学信息数据库Ⅳ(MIMIC-Ⅳ),收集2008至2021年S-AKI患者的临床数据。初步纳入58个相关预测因素,以3个月内全因死亡为结局事件。... 详细信息

目的建立并评价脓毒症相关性急性肾损伤(S-AKI)患者3个月死亡风险的列线图预测模型。方法基于美国重症监护医学信息数据库Ⅳ(MIMIC-Ⅳ),收集2008至2021年S-AKI患者的临床数据。初步纳入58个相关预测因素,以3个月内全因死亡为结局事件。按7∶3比例将数据分为训练集和验证集。在训练集中采用单因素Logistic回归分析初步筛选变量,运用多重共线性分析、Lasso回归和随机森林算法并结合临床应用价值进行变量选择,建立多因素Logistic回归模型并利用列线图进行可视化表达。在验证集中进行内部验证,评价模型预测价值;绘制受试者工作特征曲线(ROC曲线)计算曲线下面积(AUC)评价列线图模型及牛津急性疾病严重度评分(OASIS)、序贯器官衰竭评分(SOFA)、全身炎症反应综合征评分(SIRS)的区分度;校准曲线评价校准度;决策曲线分析(DCA)评估不同阈值概率下的净效益。结果基于确诊后3个月时的生存状况将患者分为存活组7768例(68.54%),死亡组3566例(31.46%)。在训练集中通过多重筛选,最终纳入7个变量,即Logistic器官功能障碍评分(LODS)、Charlson合并症指数、尿量、国际标准化比值(INR)、呼吸支持方式、血尿素氮和年龄,并纳入列线图模型。在验证集中进行内部验证,ROC曲线分析显示,列线图模型的AUC为0.81〔95%可信区间(95%CI)为0.80~0.82〕,大于OASIS评分的0.70(95%CI为0.69~0.71),远大于SOFA评分的0.57(95%CI为0.56~0.58)和SIRS评分的0.56(95%CI为0.55~0.57),具有较好区分度。校准曲线显示列线图模型校准度优于OASIS、SOFA、SIRS评分。DCA曲线显示列线图模型在不同阈概率情况下的临床净收益均好于OASIS、SOFA、SIRS评分。结论基于MIMIC-Ⅳ临床大数据建立的一个包含7项变量的S-AKI患者3个月死亡风险预测列线图模型具有很好的区分度和校准度,为评估S-AKI患者预后提供了有效的新工具。

关键词：脓毒症相关性急性肾损伤死亡风险列线图模型

普通高中与空军青少年航空学校高三学生抗荷体质差异分析

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海军军医大学学报 2024年第5期45卷 640-645页

作者：汪晓华厉晓杰齐林嵩邹志康安徽医科大学卫生管理学院合肥230032 空军特色医学中心骨科北京100142 空军特色医学中心眼科北京100142 空军军医大学科研学术处西安710032

目的对比空军青少年航空学校(青航校)与普通高中高三学生招飞抗荷体质相关指标差异,探索青少年航空学校抗荷体质训练成果,为训练方案优化提供科学依据。方法随机抽取参加2022年空军招飞医学选拔定选阶段的160名青航校高三学员与191名普... 详细信息

目的对比空军青少年航空学校(青航校)与普通高中高三学生招飞抗荷体质相关指标差异,探索青少年航空学校抗荷体质训练成果,为训练方案优化提供科学依据。方法随机抽取参加2022年空军招飞医学选拔定选阶段的160名青航校高三学员与191名普通高中高三学生作为研究对象,其中青航校学员按照既定培养方案在高中阶段接受专项抗荷体质训练,普通高中生体育锻炼情况通过问卷调查收集。收集两组研究对象的人体尺寸、体重、身体成分、肌肉力量等指标并进行比较分析。参照WHO标准将体脂率分为低(20%)3个等级,采用四分位数法将骨骼肌质量指数(SMI)分为低(SMI≤下四分位数)、适中(下四分位数0.05);青航校学员SMI高于普通高中生(P0.05);青航校学员腰背肌力与下肢肌力的均值和峰值高于普通高中生(均P0.05)。SMI与抗荷力量(腰背肌力峰值、腰背肌力均值、下肢肌力峰值、下肢肌力均值)呈正相关(r=0.32~0.39,均P0.05)。结论青航校抗荷体质训练在学员的抗荷相关肌肉力量提高方面成效显著,但在体脂率控制方面仍存在改进空间,未来青航校抗荷体质训练需兼顾肌肉训练与体脂控制。

关键词：空军青少年航空学校抗荷身体成分肌肉力量