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Scene-adaptive crowd counting method based on meta learning with dual-input network DMNet

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Frontiers of Computer Science 2023年第1期17卷 91-100页

作者： Haoyu ZHAO Weidong MIN jianqiang xu Qi WANG Yi ZOU Qiyan FU School of Information Engineering Nanchang UniversityNanchang 330031China School of Software Nanchang UniversityNanchang 330047China Jiangxi Key Laboratory of Smart City Nanchang 330047China

Crowd counting is recently becoming a hot research topic, which aims to count the number of the people in different crowded scenes. Existing methods are mainly based on training-testing pattern and rely on large data training, which fails to accurately count the crowd in real-world scenes because of the limitation of model’s generalization capability. To alleviate this issue, a scene-adaptive crowd counting method based on meta-learning with Dual-illumination Merging Network (DMNet) is proposed in this paper. The proposed method based on learning-to-learn and few-shot learning is able to adapt different scenes which only contain a few labeled images. To generate high quality density map and count the crowd in low-lighting scene, the DMNet is proposed, which contains Multi-scale Feature Extraction module and Element-wise Fusion Module. The Multi-scale Feature Extraction module is used to extract the image feature by multi-scale convolutions, which helps to improve network accuracy. The Element-wise Fusion module fuses the low-lighting feature and illumination-enhanced feature, which supplements the missing illumination in low-lighting environments. Experimental results on benchmarks, WorldExpo’10, DISCO, USCD, and Mall, show that the proposed method outperforms the existing state-of-the-art methods in accuracy and gets satisfied results.

关键词： crowd counting meta-learning scene-adaptive Dual-illumination Merging Network

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一种新的自然伽马测井仪死时间修正方法

能源研究与管理 2024年第1期16卷 125-130页

作者：许坚强张丽娇王仁波东华理工大学南昌330013 东华理工大学核技术应用教育部工程研究中心南昌330013

死时间是决定伽马测井数据准确性的一个重要参数,传统的死时间修正方法存在测量条件较高,或测量步骤繁琐,或计算步骤复杂,或存在一定的安全隐患等不足。为降低测量条件、简化测量和计算步骤以及降低测量风险,提出一种新的死时间测量方... 详细信息

死时间是决定伽马测井数据准确性的一个重要参数,传统的死时间修正方法存在测量条件较高,或测量步骤繁琐,或计算步骤复杂,或存在一定的安全隐患等不足。为降低测量条件、简化测量和计算步骤以及降低测量风险,提出一种新的死时间测量方法——“图解法”。从原理上详细论述了其可行性,并开展了相关实验以验证其可行性。使用2套伽马探测系统利用“图解法”获取的死时间对系列已知铀质量分数的饱和模型的计数率数据进行修正,对比修正前后计数率与铀质量分数的线性拟合优度以及“图解法”与“双源法”所得死时间值的大小。结果表明:2套伽马探测系统经“图解法”死时间修正前后计数率与铀质量分数的线性拟合优度分别为0.986和0.998以及0.98和0.998,说明“图解法”是有效的;“图解法”与“双源法”所得死时间值分别为0.902μs和0.941μs以及1.674μs和1.745μs,相对误差仅为-4.145%和-4.069%,说明“图解法”相对准确。因此,可将“图解法”作为伽马测井仪死时间修正方法应用于实际中。

关键词：死时间伽马测井仪双源法图解法

琥珀酸脱氢酶抑制剂类杀菌剂对禾谷丝核菌的抑制活性及结合模式

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农药学学报 2024年第4期26卷 757-764页

作者：周温棋高续恒成泽珺郑伟刘圣明徐建强河南科技大学园艺与植物保护学院植物保护系河南洛阳471023

主要由禾谷丝核菌Rhizoctonia cerealis引起的小麦纹枯病是一种土传真菌病害,自20世纪90年代中期以来,黄淮麦区小麦纹枯病逐渐由次要病害上升为主要病害,对常见的杀菌剂类型已经出现了抗性菌株。新商品化的琥珀酸脱氢酶抑制剂类(SDHIs)... 详细信息

主要由禾谷丝核菌Rhizoctonia cerealis引起的小麦纹枯病是一种土传真菌病害,自20世纪90年代中期以来,黄淮麦区小麦纹枯病逐渐由次要病害上升为主要病害,对常见的杀菌剂类型已经出现了抗性菌株。新商品化的琥珀酸脱氢酶抑制剂类(SDHIs)杀菌剂对禾谷丝核菌的抑制活性尚未见报道。本研究选取3株禾谷丝核菌ZMDBY-9、JZWZ-8和ZMDBY-6,采用菌丝生长速率法测定了10种SDHIs类杀菌剂萎锈灵、氟酰胺、噻呋酰胺、啶酰菌胺、吡唑萘菌胺、氟唑菌酰胺、苯并烯氟菌唑、氟吡菌酰胺、氟吡菌酰羟胺和联苯吡嗪菌胺对禾谷丝核菌的抑制活性;采用同源模建及分子对接,研究了RcSDH bcd构成的蛋白模型与10种SDHIs类杀菌剂的结合模式,进一步分析了结合能与抑菌效果的关联性。菌丝生长速率法测定结果显示:苯并烯氟菌唑和氟唑菌酰胺对禾谷丝核菌的抑制活性较高,平均有效抑制中浓度(EC50)值小于0.1 mg/L;氟吡菌酰胺与氟唑菌酰羟胺的抑制活性较弱,平均EC50值大于1 mg/L;其他6种杀菌剂的平均EC50值为0.1~0.6 mg/L。分子对接结果显示:在10种SDHIs类杀菌剂中,含吡唑-4-酰胺结构的药剂对禾谷丝核菌的抑制活性最好,结合能更低。其中7种杀菌剂分子的抑制活性与结合能之间存在一定的关联性,表现为抑制活性强结合能往往较低。本文研究结果为SDHIs类杀菌剂在小麦纹枯病化学防治中的应用及基于琥珀酸脱氢酶的药剂设计提供了参考。

关键词：琥珀酸脱氢酶抑制剂类杀菌剂禾谷丝核菌抑菌活性同源建模分子对接结合模式

四氟醚唑对烟草高氏白粉菌的抑制作用及对烟草白粉病的温室防效

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农药学学报 2024年第4期26卷 825-830页

作者：李天杰郑伟苗圃王惠汪孝国周俊学康业斌徐建强河南科技大学园艺与植物保护学院河南洛阳471000 河南省烟草公司洛阳市公司河南洛阳471000

为评估四氟醚唑在烟草白粉病上的应用潜力,采用孢子萌发抑制法测定了四氟醚唑对烟草高氏白粉菌的室内毒力,并观察了其对烟草高氏白粉菌形态的影响;通过盆栽试验测定了四氟醚唑对烟草白粉病的温室防治效果。结果表明:四氟醚唑对3株烟草... 详细信息

为评估四氟醚唑在烟草白粉病上的应用潜力,采用孢子萌发抑制法测定了四氟醚唑对烟草高氏白粉菌的室内毒力,并观察了其对烟草高氏白粉菌形态的影响;通过盆栽试验测定了四氟醚唑对烟草白粉病的温室防治效果。结果表明:四氟醚唑对3株烟草高氏白粉菌菌株分生孢子萌发有强烈的抑制作用,其EC50值分别为0.3422、0.3561和0.4105μg/mL;对芽管伸长的抑制作用明显,其EC50值分别为1.7466、1.3988和1.3229μg/mL。光学显微镜观察结果表明:四氟醚唑对烟草高氏白粉菌分生孢子无致畸作用,但能使其初生菌丝畸形。温室防效试验结果表明:4%四氟醚唑水乳剂在有效成分1.61、3.22和5.36 g/L剂量下,喷施处理烟苗14 d后,保护作用的防效在76.62%~95.67%之间,治疗作用的防效在71.42%~90.91%之间。

关键词：四氟醚唑烟草高氏白粉菌毒力测定温室防效

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不同直播方式对水稻产量及经济效益的影响

浙江农业科学 2024年第4期65卷 844-847页

作者：沈足金钱秋杰徐建强嘉兴市农业科学研究院桐乡农业科学研究所浙江桐乡314500

为探索不同直播方式对水稻生产的影响,筛选出科学高效的播种方式,以秀水14为试验品种,特开展3种不同水稻直播方式对比试验。结果表明,不同直播方式水稻总叶龄、结实率无明显差异,其中穴直播方式下水稻叶龄和分蘖数增长相对较慢,有效穗... 详细信息

为探索不同直播方式对水稻生产的影响,筛选出科学高效的播种方式,以秀水14为试验品种,特开展3种不同水稻直播方式对比试验。结果表明,不同直播方式水稻总叶龄、结实率无明显差异,其中穴直播方式下水稻叶龄和分蘖数增长相对较慢,有效穗数相对偏低,但穗粒数多、千粒重大,实际产量达9037.5 kg·hm^(-2),分别比喷直播和飞播高7.8%、3.1%;穴直播方式效益最高,达4847.3元·hm^(-2),分别比喷直播和飞播高60.8%、15.0%,是目前桐乡地区最理想的水稻直播方式。

关键词：水稻直播方式产量效益

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Detrital zircon U–Pb geochronology and Hf isotopic compositions of Middle–Upper Ordovician sandstones from the Quruqtagh area, eastern Tarim Basin:implications for sedimentary provenance and tectonic evolution

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Chinese Science Bulletin 2014年第10期59卷 1002-1012页

作者： Shunli Dong Zhong Li jianqiang xu Jian Gao Chuntao Guo Institute of Geology and Geophysics Chinese Academy of Sciences University of Chinese Academy of Science

Figuring out whether the sedimentary provenance regions of the thick deep-water turbidite systems deposited during Middle–Upper Ordovician in South Quruqtagh are the intracontinental uplifts or the peripheral orogenic belts is of great significance for us to understand the tectono-sedimentary nature of the northeastern Tarim Basin and basin-range coupling processes in the middle *** paper reports the in situ LA-ICP-MS U–Pb ages and Hf isotope data on detrital zircons from two Middle–Upper Ordovician sandstone samples which were collected from the Charchag Formation and the Zatupo Formation in South Quruqtagh,*** results show that the studied two samples have extremely similar U–Pb age patterns and Hf isotopic compositions,reflecting multiphase tectonothermal events with age groups of 527–694,713–870 Ma(peaking at 760 Ma),904–1,090,1,787–2,094 Ma(peaking at 1,975 Ma)and 2,419–2,517 *** previous studies,the presence of age groups of 713–1,090 and1,787–2,094 Ma,respectively,demonstrates that Tarim had ever been a part of Rodinia and Columbia ***,98%of 713–870 Ma detrital zircons are characterized by negative e Hf(t)values ranging from-38.07 to-0.61,which are highly consistent with those of Neoproterozoic granites from the Quruqtagh *** Early Paleozoic ages(*470–500 Ma)signifying subduction or collision events in Altyn Tagh were detected in the two samples,indicating that the Middle–Late Ordovician sediments in South Quruqtagh and northern Mangar depression were mainly derived from intracontinental uplifts,i.e.,the North Quruqtagh uplift or the Tabei paleo-uplift,rather than the Altyn *** conjunction with regional sedimentary-tectonic background and previous studies,we proposed preliminarily that the northeastern Tarim remained as a passive continental margin in Late Ordovician and changed into an active-continental margin in Silurian due to the southward subduction of the South-Tianshan Ocean.

关键词： Tarim Basin - Quruqtagh Middle-Upper Ordovician Detrital zircons Provenance Altyn Tagh

The Application of Artificial Intelligence in Alzheimer’s Research

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Tsinghua Science and Technology 2024年第1期29卷 13-33页

作者： Qing Zhao Hanrui xu jianqiang Li Faheem Akhtar Rajput Liyan Qiao Faculty of Information Technology Beijing University of TechnologyBeijing 100124China School of Medicine Tsinghua UniversityBeijing 100084China Department of Computer Science Sukkur IBA UniversitySukkur 65200Pakistan Department of Neurology Tsinghua University Yuquan HospitalBeijing 100040China

Alzheimer's disease(AD)is an irreversible and neurodegenerative disease that slowly impairs memory and neurocognitive function,but the etiology of AD is still *** the explosive growth of electronic health data,the application of artificial inteligence(Al)in the healthcare setting provides excellent potential for exploring etiology and personalized treatment approaches,and improving the disease's diagnostic and prognostic *** paper first briefly introduces Al technologies and applications in medicine,and then presents a comprehensive review of Al in *** simple,it includes etiology discovery based on genetic data,computer-aided diagnosis(CAD),computer-aided prognosis(CAP)of AD using multi-modality data(genetic,neuroimaging and linguistic data),and pharmacological or non-pharmacological approaches for treating ***,some popular publicly available AD datasets are introduced,which are important for advancing Al technologies in AD ***,core research challenges and future research directions are discussed.

关键词： Alzheimer's disease artificial intelligence etiology discovery computer-aided diagnosis computer-aided prognosis treatment

老年股骨粗隆间骨折围手术期应用氨基己酸和氨甲环酸的临床疗效比较

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实用老年医学 2024年第9期38卷 926-930页

作者：李唐波马丙涛刘琳琳徐建强中国人民解放军火箭军特色医学中心骨科北京市100088

目的比较氨基己酸和氨甲环酸降低老年股骨粗隆间骨折围手术期失血的临床效果。方法回顾性分析2020—2022年收治的98例行股骨粗隆间骨折闭合复位髓内钉内固定术病人的临床资料,按照围手术期使用氨基己酸或氨甲环酸分为氨基己酸组和氨... 详细信息

目的比较氨基己酸和氨甲环酸降低老年股骨粗隆间骨折围手术期失血的临床效果。方法回顾性分析2020—2022年收治的98例行股骨粗隆间骨折闭合复位髓内钉内固定术病人的临床资料,按照围手术期使用氨基己酸或氨甲环酸分为氨基己酸组和氨甲环酸组。比较2组病人失血量及相关并发症发生情况。结果 2组病人年龄、性别、身高、体质量、BMI、术前红细胞压积、总血容量差异均无统计学意义(P>0.05)。氨甲环酸组术后24 h内总失血量、术后24 h内隐性失血量及输血率、总输血量较氨基己酸组明显降低,差异有统计学意义(P0.05)。结论氨甲环酸减少股骨粗隆间骨折闭合复位内固定围术期失血的效果较氨基己酸强,特别是在减少隐性失血量方面优势明显,氨甲环酸可作为老年股骨粗隆间骨折闭合复位髓内钉内固定围术期首选的抗纤溶止血药物。

关键词：氨基己酸氨甲环酸股骨粗隆间骨折失血量

Cerium refinement of grains and primary carbides during solidification of Cr_(4)Mo_(4)V bearing steel

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Journal of Rare Earths 2024年第4期42卷 783-792页

作者： Weifeng Liu jianqiang Wang Mingyue Sun Bin xu Jiahao Yao Qunbo Fan Dianzhong Li Chongqing Innovation Center Beijing Institute of TechnologyChongqing401135China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The effect of cerium(Ce)on the solidification microstructure of Cr_(4)Mo_(4)V bearing steel was investigated via a combined experimental and theoretical *** a trace amount(0.056 wt%)of Ce addition,the coarse columnar grains in as-cast microstructure transform into equiaxed ones,and the average diameter is reduced from 56 to 27μ*** network-like and bulky primary MC and M2C carbides at the interdendritic regions become disconnected and refined,and their volume percentage decreases from4.15 vol%to 2.1 vol%.Ce-inclusions acting as heterogeneous nucleation agents of prior-austenite grains and Ce atoms segregating at grain boundaries,both contribute to the refinement of *** calculations reveal that primary carbides are precipitated afterγ-austenite forms near the end of the solidification *** modification of primary carbides in size and amount is mainly attributed to the isolated remaining melt separated by refinedγ-austenite grains in which the nucleation of carbides is promoted,while the growth is restrained owing to the less segregation of alloying elements.

关键词： Cr_(4)Mo_(4)V bearing steel Rare Earths Grains Primary carbides Refinement