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结构形状对太阳能烟囱系统热特性的影响研究

太阳能学报 2024年第2期45卷 1-9页

作者：贾靖聂晶王静文苏昊闫素英高虹内蒙古工业大学能源与动力工程学院呼和浩特010051 内蒙古可再生能源重点实验室呼和浩特010051

不同太阳能烟囱(SC)形状对系统集热特性影响不同。建立10°圆形SC数值模拟模型和试验台架,将系统数值模拟与试验测试结果对比验证,二者相对误差值小于4%,数值模拟方法正确;采用相同的数值模拟方法对0°圆形、0°方形和10°方形SC模型进... 详细信息

不同太阳能烟囱(SC)形状对系统集热特性影响不同。建立10°圆形SC数值模拟模型和试验台架,将系统数值模拟与试验测试结果对比验证,二者相对误差值小于4%,数值模拟方法正确;采用相同的数值模拟方法对0°圆形、0°方形和10°方形SC模型进行计算,将不同系统计算结果进行对比。结果表明:不同系统结构蓄热层表面温度场均匀性和受烟囱阴影影响不同,10°方形蓄热层表面温度场受烟囱阴影影响最小;对比烟囱内流体速度,10°方形具有更高速度梯度,更有利于确定涡轮机的位置;不同系统烟囱内部流体总焓差不同,10°方形SC系统总焓差较大;相比于0°圆形SC系统,其他3个SC系统的集热效率分别提高了11.328%、43.705%和66.061%,质量流量提升了59.36%、8.39%和39.04%。

关键词：太阳能烟囱集热棚形状集热棚倾角集热效率数值模拟不确定性分析

Deep learning framework for comprehensive molecular and prognostic stratifications of triple-negative breast cancer

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Fundamental Research 2024年第3期4卷 678-689页

作者： Shen Zhao Chao-Yang Yan Hong Lv jing-Cheng Yang Chao You Zi-Ang Li Ding Ma Yi Xiao jia Hu Wen-Tao Yang Yi-Zhou jiang Jun Xu Zhi-Ming Shao Key Laboratory of Breast Cancer in Shanghai Department of Breast SurgeryFudan University Shanghai Cancer CenterShanghai 200032China Institute for AI in Medicine School of Artificial IntelligenceNanjing University of Information Science and TechnologyNanjing 210044China Department of Pathology Fudan University Shanghai Cancer CenterShanghai 200032China Greater Bay Area Institute of Precision Medicine Guangzhou 511466China Department of Radiology Fudan University Shanghai Cancer CenterShanghai 200032China

Triple-negative breast cancer(TNBC)is the most challenging breast cancer *** stratification and target therapy bring clinical benefit for TNBC patients,but it is difficult to implement comprehensive molecular testing in clinical ***,using our multi-omics TNBC cohort(N=425),a deep learning-based framework was devised and validated for comprehensive predictions of molecular features,subtypes and prognosis from pathological whole slide *** framework first incorporated a neural network to decompose the tissue on WSIs,followed by a second one which was trained based on certain tissue types for predicting different ***-omics molecular features were analyzed including somatic mutations,copy number alterations,germline mutations,biological pathway activities,metabolomics features and immunotherapy *** was shown that the molecular features with therapeutic implications can be predicted including the somatic PIK3CA mutation,germline BRCA2 mutation and PD-L1 protein expression(area under the curve[AUC]:0.78,0.79 and 0.74 respectively).The molecular subtypes of TNBC can be identified(AUC:0.84,0.85,0.93 and 0.73 for the basal-like immune-suppressed,immunomodulatory,luminal androgen receptor,and mesenchymal-like subtypes respectively)and their distinctive morphological patterns were revealed,which provided novel insights into the heterogeneity of TNBC.A neural network integrating image features and clinical covariates stratified patients into groups with different survival outcomes(log-rank P<0.001).Our prediction framework and neural network models were externally validated on the TNBC cases from TCGA(N=143)and appeared robust to the changes in patient *** potential clinical translation,we built a novel online platform,where we modularized and deployed our framework along with the validated *** can realize real-time one-stop prediction for new *** summary,using only pathological WSIs,our proposed framework

关键词： Triple-negative breast cancer Deep learning Digital pathology Patient stratification Online platform

低成本季铵盐类多孔材料的合成及氨气吸附性能

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高等学校化学学报 2024年第1期45卷 1-7页

作者：杨玉婷丛明晓景晓飞刘佳吉林大学化学学院长春130012 东北师范大学多酸与网格材料化学教育部重点实验室长春130024

氨气是雾霾的主要污染源之一,开发高效的氨气吸附材料是一种有效的防治方法.本文选用4,4′-联吡啶、α,α′-二溴-对二甲苯和1,2,4,5-四(溴甲基)苯作为构筑单元,利用无需催化剂且操作简便的季铵化反应,原位合成了具有路易斯酸活性位点... 详细信息

氨气是雾霾的主要污染源之一,开发高效的氨气吸附材料是一种有效的防治方法.本文选用4,4′-联吡啶、α,α′-二溴-对二甲苯和1,2,4,5-四(溴甲基)苯作为构筑单元,利用无需催化剂且操作简便的季铵化反应,原位合成了具有路易斯酸活性位点的多孔材料PAF-C1和PAF-C2.得益于骨架中路易斯酸位点的存在,这两种材料均具有良好的氨气吸附性能.其中,PAF-C2骨架中含有更多的路易斯酸位点,因此具备更优异的氨气吸附性能,在298 K和1×10^(5)Pa条件下其氨气吸附量可达5.5 mmol/g.此外,探究了材料的合成条件(温度、溶剂和保护气体)、原料用量及合成方式的影响.结果表明,以上不同反应条件制备的材料均保持优良的氨气吸附性能,从而使实现工业化合成高效氨气吸附材料成为可能.

关键词：多孔材料季铵化反应路易斯酸位点机械球磨法氨气吸附

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新媒体时代体育明星形象塑造价值及优化策略

体育文化导刊 2024年第6期 34-39页

作者：贾静敬张佃波单涛山东体育学院国家足球学院国家篮球学院山东日照276800 山东华宇工学院设计与艺术学院山东德州253034

运用文献资料、逻辑分析等方法,分析新媒体时代我国体育明星形象特征、塑造价值,并提出优化策略。特征:媒介形象娱乐化,个体形象立体化,角色转换多样化。价值:展现多元形象,传播体育文化;弘扬体育精神,发挥育人功效;推进体育外交,深化... 详细信息

运用文献资料、逻辑分析等方法,分析新媒体时代我国体育明星形象特征、塑造价值,并提出优化策略。特征:媒介形象娱乐化,个体形象立体化,角色转换多样化。价值:展现多元形象,传播体育文化;弘扬体育精神,发挥育人功效;推进体育外交,深化文化交流。优化策略:扩大体育明星榜样力量,营造良好舆论环境;搭建新媒体的宣传矩阵,加强传播体育精神;培育体育明星外交素养,加强外交人才的培养;设置育人导向网络议程,提升把关人工作能力。

关键词：体育管理体育明星形象塑造新媒体时代

Association between triglyceride-glucose index and colorectal polyps:A retrospective cross-sectional study

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World Journal of Gastrointestinal Endoscopy 2024年第2期16卷 55-63页

作者： Ya-Jie Teng Ying-Xue Yang jing-jing Yang Qiu-Yan Lu jia-Yi Shi jian-Hao Xu Jie Bao Qing-Hua Wang Department of Gastroenterology The First People's Hospital of KunshanSuzhou 215300Jiangsu ProvinceChina Department of Pathology The First People's Hospital of KunshanSuzhou 215300Jiangsu ProvinceChina

BACKGROUND Colorectal polyps(CPs)are frequently occurring abnormal growths in the colorectum,and are a primary precursor of colorectal cancer(CRC).The triglyceride-glucose(TyG)index is a novel marker that assesses metabolic health and insulin resistance,and has been linked to gastrointestinal *** To investigate the potential association between the TyG index and CPs,as the relation between them has not been *** A total of 2537 persons undergoing a routine health physical examination and colonoscopy at The First People's Hospital of Kunshan,jiangsu Province,China,between January 2020 and December 2022 were included in this retrospective cross-sectional *** excluding individuals who did not meet the eligibility criteria,descriptive statistics were used to compare characteristics between patients with and without *** regression analyses were conducted to determine the associations between the TyG index and the prevalence of *** TyG index was calculated using the following formula:Ln[triglyceride(mg/dL)×glucose(mg/dL)/2].The presence and types of CPs was determined based on data from colonoscopy reports and pathology *** A nonlinear relation between the TyG index and the prevalence of CPs was identified,and exhibited a curvilinear pattern with a cut-off point of 2.31.A significant association was observed before the turning point,with an odds ratio(95% confidence interval)of 1.70(1.40,2.06),P<***,the association between the TyG index and CPs was not significant after the cut-off point,with an odds ratio(95% confidence interval)of 0.57(0.27,1.23),P=*** Our study revealed a curvilinear association between the TyG index and CPs in Chinese individuals,suggesting its potential utility in developing colonoscopy screening strategies for preventing CRC.

关键词： Triglyceride-glucose index Colorectal polyps Colorectal cancer Insulin resistance Cross-sectional study

基于直流线路互联的区-隧供电系统弹性恢复策略

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电工技术学报 2024年第7期39卷 2089-2103页

作者：孔惠文马静程鹏贾利民新能源电力系统全国重点实验室(华北电力大学) 北京102206 国家能源交通融合发展研究院(华北电力大学) 北京102206 轨道交通控制与安全国家重点实验室(北京交通大学) 北京100044

在“双碳”目标下,以服务区光伏车棚、光伏隧道为代表的能源交通融合供电场景逐步普及,这使得形态开放且布局分散的区-隧供电系统在面临极端灾害或人为攻击时更为脆弱。为此,该文提出一种基于直流线路互联的区-隧供电系统弹性恢复策略... 详细信息

在“双碳”目标下,以服务区光伏车棚、光伏隧道为代表的能源交通融合供电场景逐步普及,这使得形态开放且布局分散的区-隧供电系统在面临极端灾害或人为攻击时更为脆弱。为此,该文提出一种基于直流线路互联的区-隧供电系统弹性恢复策略。根据灾害前对直流线路的改造与韧性加固计划,首先,提出了基于直流线路被优先遍历的可行拓扑搜索策略,用于保障所提系统在极端灾害后的有效互联;其次,基于对故障负荷重要级权重的多层级分类策略,该文先后以重要负荷恢复量最大化和系统额外损耗最小化为目标构建了故障恢复目标函数,共同保证极端灾害发生后系统基于稀缺分布式能源的最大弹性恢复;再次,基于传统二阶锥松弛方法可能挣脱原始约束的缺陷,提出通过约束额外损耗中流经电流分量实现对混合整数二阶锥规划问题的收敛,确保所提模型在不同初始条件下的稳定适用;最后,通过涵盖区-隧供电系统的改进IEEE 123节点配电网进行仿真,验证了所提策略的有效性。

关键词：区-隧供电系统直流线路互联深度优先遍历弹性恢复

Verification of Seasonal Prediction by the Upgraded China Multi-Model Ensemble Prediction System(CMMEv2.0)

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Journal of Meteorological Research 2024年第5期 880-900页

作者： Jie WU Hong-Li REN jianghua WAN jingpeng LIU Jinqing ZUO Changzheng LIU Ying LIU Yu NIE Chongbo ZHAO Li GUO Bo LU Lijuan CHEN Qing BAO jingzhi SU Lin WANG jing-jia LUO Xiaolong jia Qingchen CHAO CMA Key Laboratory of Climate Prediction Studies National Climate Centre China Meteorological Administration (CMA) Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology State Key Laboratory of Severe Weather and Institute of Tibetan Plateau Meteorology Chinese Academy of Meteorological SciencesChina Meteorological Administration State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences CMA Earth System Modeling and Prediction Centre China Meteorological Administration

Based on a combination of six Chinese climate models and three international operational models, the China multimodel ensemble (CMME) prediction system has been upgraded into its version 2 (CMMEv2.0) at the National Climate Centre (NCC) of the China Meteorological Administration (CMA) by including new model members and expanding prediction products. A comprehensive assessment of the performance of the upgraded CMME during its hindcast (1993–2016) and real-time prediction (2021–present) periods is conducted in this study. The results demonstrate that CMMEv2.0 outperforms all the individual models by capturing more realistic equatorial sea surface temperature (SST) variability. It exhibits better prediction skills for precipitation and 2-m temperature anomalies, and the improvements in prediction skill of CMMEv2.0 are significant over East Asia. The superiority of CMMEv2.0 can be attributed to its better projection of El Ni?o–Southern Oscillation (ENSO; with the temporal correlation coefficient score for Ni?o3.4 index reaching 0.87 at 6-month lead) and ENSO-related teleconnections. As for the real-time prediction in recent three years, CMMEv2.0 has also yielded relatively stable skills; it successfully predicted the primary rainbelt over northern China in summers of 2021–2023 and the warm conditions in winters of 2022/2023. Beyond that, ensemble sampling experiments indicate that the CMMEv2.0 skills become saturated after the ensemble model number increased to 5–6, indicating that selection of only an optimal subgroup of ensemble models could benefit the prediction performance, especially over the extratropics, yet the underlying reasons await future investigation.

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Sm^(3+)掺杂LaOF荧光粉的制备及光学性能

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材料导报 2024年第3期38卷 13-19页

作者：贾宇盟史忠祥王晶李翔大连交通大学辽宁省无机超细粉体制备及应用重点实验室辽宁大连116028

以LaOF晶体为基质,利用水热辅助固相法制备出一系列Sm^(3+)掺杂LaOF荧光粉。采用XRD、TEM、荧光光谱仪等测试手段对所制得的样品的相结构、微观形貌及光学性能进行表征。结果表明,LaOF在不同煅烧温度下会产生四方相和斜方六面体两种不... 详细信息

以LaOF晶体为基质,利用水热辅助固相法制备出一系列Sm^(3+)掺杂LaOF荧光粉。采用XRD、TEM、荧光光谱仪等测试手段对所制得的样品的相结构、微观形貌及光学性能进行表征。结果表明,LaOF在不同煅烧温度下会产生四方相和斜方六面体两种不同晶相。此外,由于受跃迁概率和局域对称性的影响,Sm^(3+)掺杂四方相LaOF发光强度更大,其各浓度样品在405 nm光激发下,于567 nm、605 nm、651 nm和710 nm等处均出现了Sm^(3+)的特征发射峰,并且随着Sm^(3+)掺杂量的增加,其发光强度呈现先增大后减小的趋势,且当Sm^(3+)掺杂量为3.0%(摩尔分数,下同)时,La_(1-x)Sm_(x)OF样品发光强度达最大值。此外,所得样品的色纯度极高,其多个激发峰均位于商用近紫外和蓝光LED芯片的发射波长附近,可实现多种波长激发下的可见橙光发射。

关键词：水热辅助固相法稀土元素钐掺杂光学性能

基于灾害场景预估的配电系统韧性两阶段故障恢复策略

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电网技术 2024年第9期48卷 3812-3821,I0079,I0080-I0082页

作者：孔惠文马静程鹏贾利民新能源电力系统国家重点实验室(华北电力大学) 北京市昌平区102206 华北电力大学国家能源交通融合发展研究院北京市昌平区102206 轨道交通控制与安全国家重点实验室(北京交通大学) 北京市海淀区100044

针对极端灾害所导致的停电事故频发,提前预估可能灾害场景,统筹部署可用应急资源对于提升配电系统韧性指数至关重要。对此,提出一种基于灾害场景预估的配电系统韧性两阶段故障恢复策略,该策略通过构建考虑时间累积效应的配电线路和交通... 详细信息

针对极端灾害所导致的停电事故频发,提前预估可能灾害场景,统筹部署可用应急资源对于提升配电系统韧性指数至关重要。对此,提出一种基于灾害场景预估的配电系统韧性两阶段故障恢复策略,该策略通过构建考虑时间累积效应的配电线路和交通道路中断模型,并采用蒙特卡洛模拟法对线路故障状态进行模拟完成对灾害场景的预估。进一步,基于所预估的灾害场景,以最小化移动应急资源到故障负荷或中断线路调度时间最短为目标,构建了包含移动应急电源充电站和维修人员维修站的灾前预定位模型,以避免高权重故障负荷的中断。此外,以高权重因子故障负荷随时间推移的甩负荷量加权和最小为目标,构建了基于移动应急资源调度的灾后恢复模型,以保证对高权重负荷的快速恢复。最后,基于改进的IEEE 33节点配电系统及其相应的交通运输网,并以所预估的灾害场景为例验证了所提两阶段故障恢复策略的有效性。

关键词：极端灾害场景预估预定位韧性故障恢复