期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到133篇文章
< 1 2 … 7 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
An intelligent solar flare prediction model based on X-ray flux curves using Long Short-Term Memory 认领 引用 被引量：1
1
作者 Yan Gao Li Zhang Long Xu 《Astronomical Techniques and Instruments》 CSCD 2025年第2期65-72,共8页
Solar flares are violent solar outbursts which have a great influence on the space environment surrounding Earth,potentially causing disruption of the ionosphere and interference with the geomagnetic field,thus causin... Solar flares are violent solar outbursts which have a great influence on the space environment surrounding Earth,potentially causing disruption of the ionosphere and interference with the geomagnetic field,thus causing magnetic storms.Consequently,it is very important to accurately predict the time period of solar flares.This paper proposes a flare prediction model,based on physical images of active solar regions.We employ X-ray flux curves recorded directly by the Geostationary Operational Environmental Satellite,used as input data for the model,allowing us to largely avoid the influence of accidental errors,effectively improving the model prediction efficiency.A model based on the X-ray flux curve can predict whether there will be a flare event within 24 hours.The reverse can also be verified by the peak of the X-ray flux curve to see if a flare has occurred within the past 24 hours.The True Positive Rate and False Positive Rate of the prediction model,based on physical images of active regions are 0.6070 and 0.2410 respectively,and the accuracy and True Skill Statistics are 0.7590 and 0.5556.Our model can effectively improve prediction efficiency compared with models based on the physical parameters of active regions or magnetic field records,providing a simple method for solar flare prediction. 展开更多
关键词 Neural Network Long Short-Term Memory Solar flare prediction X-ray flux curve
暂未订购 下载PDF
Low-intensity transcranial ultrasound neuromodulation promotes neuronal regeneration:A new hope for noninvasive treatment of neurodegenerative diseases 认领 引用 被引量：2
2
作者 Shu Xia Chen He +4 位作者 Yunfei Li Hao Li Bo Wang Long Xu Xudong Zhao 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第6期2300-2312,共13页
Neurodegenerative diseases,which are characterized by progressive neuronal loss and the lack of disease-modifying therapies,are becoming a major global health challenge.The existing neuromodulation techniques,such as ... Neurodegenerative diseases,which are characterized by progressive neuronal loss and the lack of disease-modifying therapies,are becoming a major global health challenge.The existing neuromodulation techniques,such as deep brain stimulation and transcranial magnetic stimulation,show limitations such as invasiveness,restricted cortical targeting,and irreversible tissue effects.In this context,low-intensity transcranial ultrasound has emerged as a promising noninvasive alternative that can penetrate deep into the brain and modulate neuroplasticity.This review comprehensively assesses the therapeutic mechanisms,efficacy,and translational potential of low-intensity transcranial ultrasound in treating neurodegenerative diseases,with emphasis on its role in promoting neuronal regeneration,modulating neuroinflammation,and enhancing functional recovery.We summarize the findings of previous studies and systematically illustrate the potential of low-intensity transcranial ultrasound in regulating cell death mechanisms,enhancing neural repair and regeneration,and alleviating symptoms associated with neurodegenerative diseases.Preclinical findings indicate that low-intensity transcranial ultrasound can enhance the release of neurotrophic factors(e.g.,brain-derived neurotrophic factor),promote autophagy to clear protein aggregates,modulate microglial activation,and temporarily open the blood-brain barrier to facilitate targeted drug delivery.Existing clinical trial data show that low-intensity transcranial ultrasound can reduce amyloid-βplaques,improve motor and cognitive deficits,and promote remyelination in various disease models.Early clinical trials suggest that low-intensity transcranial ultrasound may enhance cognitive scores in Alzheimer’s disease and alleviate motor symptoms in Parkinson’s disease,all while demonstrating a favorable safety profile.Past studies support the notion that by integrating safety,precision,and reversibility,low-intensity transcranial ultrasound can transform the treatment landscape for neurodegenerative disease.However,more advancements are necessary for future clinical application of low-intensity transcranial ultrasound,including optimizing parameters such as frequency,intensity,and duty cycle;considering individual anatomical differences;and confirming long-term efficacy.We believe establishing standardized protocols,conducting larger trials,and investigating the underlying mechanisms to clarify dose-response relationships and refine personalized application strategies are essential in this regard.Future research should focus on translating preclinical findings into clinical practice,addressing technical challenges,and exploring combination therapies with pharmacological or gene interventions. 展开更多
关键词 Alzheimer’s disease frontotemporal dementia low-intensity transcranial ultrasound multiple sclerosis multiple system atrophy neurodegenerative diseases neuromodulation neuronal regeneration Parkinson’s disease transcranial ultrasound stimulation
暂未订购 下载PDF
Enhanced multi-agent deep reinforcement learning for efficient task offloading and resource allocation in vehicular networks 认领 引用
3
作者 Long Xu Jiale Tan Hongcheng Zhuang 《Digital Communications and Networks》 SCIE EI CSCD 2026年第1期66-75,共10页
In response to the rising demand for low-latency,computation-intensive applications in vehicular networks,this paper proposes an adaptive task offloading approach for Vehicle-to-Everything(V2X)environments.Leveraging ... In response to the rising demand for low-latency,computation-intensive applications in vehicular networks,this paper proposes an adaptive task offloading approach for Vehicle-to-Everything(V2X)environments.Leveraging an enhanced Multi-Agent Deep Deterministic Policy Gradient(MADDPG)algorithm with an attention mechanism,the proposed approach optimizes computation offloading and resource allocation,aiming to minimize energy consumption and service delay.In this paper,vehicles dynamically offload computing-intensive tasks to both nearby vehicles through V2V links and roadside units through V2I links.The adaptive attention mechanism enables the system to prioritize relevant state information,leading to faster convergence.Simulations conducted in a realistic urban V2X scenario demonstrate that the proposed Attention-enhanced MADDPG(AT-MADDPG)algorithm significantly improves performance,achieving notable reductions in both energy consumption and latency compared to baseline algorithms,especially in high-demand,dynamic scenarios. 展开更多
关键词 Computation offloading Vehicular networks Deep reinforcement learning Adaptive offloading Spectrum and power allocation
暂未订购 下载PDF
Revealing effects of creep damage on high-temperature fatigue behavior for HfNbTiZr refractory high-entropy alloys:Experimental investigation and crystal-plasticity modelling 认领 引用 被引量：4
4
作者 Long Xu Hui Chen +6 位作者 Yuefei Jia Dongpeng Wang Shiwei Wu Yandong Jia Gang Wang Zixu Guo Yilun Xu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第28期134-150,共17页
Refractory high-entropy alloys(RHEAs)are promising for high-temperature applications due to their ex-ceptional mechanical properties at high temperatures.However,limited studies on their high-temperature fatigue behav... Refractory high-entropy alloys(RHEAs)are promising for high-temperature applications due to their ex-ceptional mechanical properties at high temperatures.However,limited studies on their high-temperature fatigue behavior hinder further development.This study systematically investigates the low-cycle fatigue(LCF)behavior of HfNbTiZr RHEA at room temperature(25℃)and elevated temperatures(350,450,and 600℃)through a combination of experimental analyses and dislocation-based damage-coupled crystal plasticity finite element(CPFE)simulations,to unveil the effects of creep damage on LCF behavior at varying temperatures.The results indicate that the LCF life dramatically decreases at an increased tem-perature,shifting from transgranular fatigue damage at lower temperatures(25-350℃)to a dual damage mechanism involving both intergranular fatigue and creep damage at higher temperatures(450-600℃).At 600℃,creep damage notably contributes to the accumulation of geometrically necessary dislocations(GNDs),crack initiation,and propagation at grain boundaries,and thus accelerates LCF failure.Compara-tive CPFE simulations reveal that creep damage significantly contributes to cyclic softening and reduction in elastic modulus,which also amplifies the strain localization under the LCF loading.The contribution of creep damage to the total stored energy density(SED)representing the overall damage increases with temperatures,accounting for 11%at 600℃.Additionally,CPFE simulations indicate that the creep dam-age notably influences the magnitude of GND density localized at grain boundaries.This study provides critical insights into the fatigue damage mechanisms of RHEAs,offering valuable guidance for their ap-plication in high temperatures. 展开更多
关键词 Refractory high-entropy alloys Elevated-temperature low-cycle fatigue Crystal plasticity finite element simulation Fatigue damage mechanisms Creep damage effect
暂未订购 下载PDF
Black Phosphorus and E7-Functionalized Sulfonated Polyetheretherketone with Effective Osteogenicity and Antibacterial Activity 认领 引用 被引量：2
5
作者 Xiao Wang Shuning Zhang +7 位作者 Ai Zhu Lingyan Cao Long Xu Junjie Wang Fei Zheng Xiangkai Zhang Hongyan Chen Xinquan Jiang 《Engineering》 SCIE EI CSCD 2025年第3期147-161,共15页
Given its excellent biological properties and the matching of its elastic modulus with that of human bone tissue,medical polyetheretherketone(PEEK)is considered a desirable candidate for bone-implant materials.However... Given its excellent biological properties and the matching of its elastic modulus with that of human bone tissue,medical polyetheretherketone(PEEK)is considered a desirable candidate for bone-implant materials.However,its poor osseointegrative and antibacterial properties greatly limit its clinical application.To address these concerns,a functional PEEK implant is needed.Herein,a novel photo-responsive multifunctional PEEK-based implant material(sPEEK/BP/E7)with both effective osteogenesis and good disinfection properties was constructed via the self-assembly of black phosphorus(BP)nanosheets,mussel-inspired polydopamine(PDA),and bioactive short peptide E7 on sulfonated PEEK(sPEEK).The versatile micro-ano-structured PEEK surface provides superior hydrophilicity,a favorable osteogenic microenvironment,and excellent photothermal effects under near-infrared(NIR)irradiation.The in vitro results showed that sPEEK/BP/E7 displays enhanced cytocompatibility and osteogenicity in terms of cell adhesion,proliferation,alkaline phosphatase(ALP)activity,matrix mineralization,and osteogenesis-related gene expression,superior to those of the sPEEK and sPEEK/BP samples.In addition to osteogenesis,the multifunctional coating exhibited strong antibacterial activity against both Staphylococcus aureus(S.aureus)and Escherichia coli(E.coli).Furthermore,it was confirmed in a rat femoral infection model that sPEEK/BP/E7 effectively resisted infection caused by S.aureus under NIR light irradiation and promoted osseointegration in vivo.Thus,this work presents a facile strategy to realize improvement of the“functional integration”of new polymer bone–implant materials and provide new ideas for their clinical application. 展开更多
关键词 Polyetheretherketone Black phosphorus nanosheets E7 peptides Stem cell recruitment Osteogenesis Antibacterial
暂未订购 下载PDF
Hierarchical detection and tracking for moving targets in underwater wireless sensor networks 认领 引用 被引量：2
6
作者 Yudong Li Hongcheng Zhuang +2 位作者 Long Xu Shengquan Li Haibo Lu 《Digital Communications and Networks》 SCIE EI CSCD 2025年第2期556-562,共7页
It is difficult to improve both energy consumption and detection accuracy simultaneously,and even to obtain the trade-off between them,when detecting and tracking moving targets,especially for Underwater Wireless Sens... It is difficult to improve both energy consumption and detection accuracy simultaneously,and even to obtain the trade-off between them,when detecting and tracking moving targets,especially for Underwater Wireless Sensor Networks(UWSNs).To this end,this paper investigates the relationship between the Degree of Target Change(DoTC)and the detection period,as well as the impact of individual nodes.A Hierarchical Detection and Tracking Approach(HDTA)is proposed.Firstly,the network detection period is determined according to DoTC,which reflects the variation of target motion.Secondly,during the network detection period,each detection node calculates its own node detection period based on the detection mutual information.Taking DoTC as pheromone,an ant colony algorithm is proposed to adaptively adjust the network detection period.The simulation results show that the proposed HDTA with the optimizations of network level and node level significantly improves the detection accuracy by 25%and the network energy consumption by 10%simultaneously,compared to the traditional adaptive period detection schemes. 展开更多
关键词 Underwater wireless sensor networks The degree of target change Mutual information Pheromone Adaptive period
暂未订购 下载PDF
Slip-band-driven dynamic recrystallization me diate d strain hardening in HfNbTaTiZr refractory high entropy alloy 认领 引用 被引量：1
7
作者 Long Xu Yuefei Jia +8 位作者 Yueli Ma Yandong Jia Shiwei Wu Chao Chen Hongyu Ding Jieren Guan Xinfeng Kan Rui Wang Gang Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第6期240-250,共11页
Refractory high-entropy alloys(RHEAs)exhibit outstanding strength at room temperature,but their high-temperature applications are hindered by severe strain-softening.Here,we report slip-band-driven dy-namic recrystall... Refractory high-entropy alloys(RHEAs)exhibit outstanding strength at room temperature,but their high-temperature applications are hindered by severe strain-softening.Here,we report slip-band-driven dy-namic recrystallization to enhance the high-temperature strain hardening of HfNbTaTiZr RHEA.By intro-ducing partial lattice defects through hot forging,we increase the nucleation sites for dynamic recrys-tallization during subsequent thermomechanical deformation,thus suppressing the strain-softening be-havior.We reveal that the high-temperature deformation is governed by the formation of heterogeneous bimodal grains along slip bands,which effectively constrain dislocation motion and improve strength,while microbands prevent premature failure.The fracture mode also changes from ductile to mixed to cleavage-dominated with increasing temperature.Our results demonstrate a simple and effective method for overcoming high-temperature strain-softening for BCC high entropy alloys. 展开更多
关键词 Refractory high-entropy alloy High-temperature strain-softening Slip band Recrystallization
暂未订购 下载PDF
Molecular insight into the transport of multicomponent heavy metals in calcium silicate hydrate and its mechanical behavior 认领 引用
8
作者 Fusheng Zha Haodong Tai +3 位作者 Qiao Wang Bo Kang Long Xu Chengfu Chu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第8期5135-5145,共11页
Heavy metal-contaminated sites are primarily treated via solidification and adsorption.Calcium silicate hydrate(C-S-H)is generated during the soil stabilization process and contributes significantly to the strength an... Heavy metal-contaminated sites are primarily treated via solidification and adsorption.Calcium silicate hydrate(C-S-H)is generated during the soil stabilization process and contributes significantly to the strength and durability of the stabilized soil.To understand how the soil moisture content and heavy metal concentration affect the transport of heavy metals and the tensile strength of C-S-H,this study performed molecular dynamics(MD)simulations under different moisture and concentration levels.The results showed that Pb2+presented the highest adsorption to the surface of C-S-H due to its strong electrostatic interaction energy.The adsorption density peaks of Pb2+were 1.5–5 times greater than those of Cd2+and Zn2+.Zn2+and Cd2+ions were more likely to be adsorbed onto water molecules and form a larger hydrated radius than Pb2+.The adsorption of heavy metals onto C-S-H initially increased as the metal concentration increased and then decreased because of the limited sorption sites on C-S-H.The diffusion coefficients of the multicomponent metals in C-S-H showed no consistent trends.The maximum tensile strength of C-S-H decreased with increasing soil moisture and heavy metal concentrations.The tensile stress increased approximately linearly with strain until it reached a peak,after which it gradually declined but remained above zero,indicating good ductility and toughness under unsaturated conditions.These findings offer valuable molecular insights into the interactions between C-S-H and heavy metals and soil moisture,thereby advancing our understanding of their combined effects on soil stabilization. 展开更多
关键词 Calcium silicate hydrate(C-S-H) Multicomponent heavy metal Molecular dynamics(MD)simulation Adsorption Tensile strength
暂未订购 下载PDF
甘蓝型油菜种质资源菌核病抗性鉴定与候选基因筛选 认领 引用
9
作者 金海润 欧阳青静 +4 位作者 龙旭 晏中彬 鲁海瑞 古开烨 田恩堂 《作物学报》 CAS CSCD 北大核心 2026年第7期2027-2044,共18页
菌核病侵染油菜茎秆会严重危害油菜生长,导致油菜产量降低10%~80%。本研究以182份甘蓝型油菜种质资源为研究材料,利用内含子长度多态性(ILP)标记评价了不同材料之间的遗传相似性,并利用田间活体茎秆接种方式对全部材料进行了接种和抗性... 菌核病侵染油菜茎秆会严重危害油菜生长,导致油菜产量降低10%~80%。本研究以182份甘蓝型油菜种质资源为研究材料,利用内含子长度多态性(ILP)标记评价了不同材料之间的遗传相似性,并利用田间活体茎秆接种方式对全部材料进行了接种和抗性鉴定,筛选出6份菌核病抗性较强的种质资源。根据抗性鉴定结果,本研究分别选取20份菌核病高抗材料和20份低抗材料进行BSA-seq分析,对单核苷酸多态性(SNP)与插入缺失标记(InDel)定位区间取交集,在甘蓝型油菜C01染色体上鉴定出一个1.52 Mb大小的菌核病抗性区段(Chr.C01:19,040,000~20,560,000 bp),结合生物信息学及基因功能注释手段,从菌核病抗性遗传区段中鉴定出11个候选基因。此外,分别从以上BSA-seq分析材料中选取遗传关系较近的高抗和低抗材料各1份,分别在接种病菌12、24及36 h后取样进行RNA-seq,并分析11个候选基因在这2份材料中的表达趋势。本研究可为甘蓝型油菜抗菌核病育种和菌核病抗性机制研究打下基础。 展开更多
关键词 甘蓝型油菜 菌核病 BSA-seq RNA-seq 候选基因
暂未订购 下载PDF
海南岛海草床生态系统受威胁状况评估 认领 引用
10
作者 任静 江志坚 +5 位作者 陈国科 亓文倩 龙旭 刘松林 吴云超 黄小平 《热带海洋学报》 CAS CSCD 北大核心 2026年第2期191-204,共14页
海草床生态系统具有重要的生态服务功能,分析其受威胁状况及影响因素,有利于针对性地提出海草床生态系统的保护策略。文章聚焦于海南岛海草床生态系统,结合调查数据、历史资料和文献,采用国际自然保护联盟(international union for cons... 海草床生态系统具有重要的生态服务功能,分析其受威胁状况及影响因素,有利于针对性地提出海草床生态系统的保护策略。文章聚焦于海南岛海草床生态系统,结合调查数据、历史资料和文献,采用国际自然保护联盟(international union for conservation of nature,IUCN)生态系统红色名录评估方法对海南岛地区海草床生态系统进行受威胁状况评估,确定其濒危程度,并探讨了人类活动和自然因素对其影响,提出相应的保护对策。研究结果显示,文昌和三亚地区海草床生态系统面临极危的严峻形势,陵水地区海草床生态系统受威胁等级为濒危,琼海地区海草床生态系统目前处于易危状态,而澄迈地区和儋州地区海草床生态系统分别处于近危和无危状态。海南岛海草床生态系统面临着多重压力,其中围填海及渔业捕捞活动是导致其受损的主导因素,其次为污水排放和水产养殖带来的环境压力,而热带气旋等气候变化因素亦对其造成一定影响。鉴于此,本研究提出了加强规范渔业活动方式、海草无性繁殖研究、长期监测海草健康状况和开展生态连通性研究等建议,旨在促进海南岛海草床生态系统的可持续发展。 展开更多
关键词 海草床 生态系统红色名录 受威胁等级 保护与恢复 海南岛
暂未订购 下载PDF
中药固体废弃物的能源化发展——“双碳”经济转型中的机遇与挑战 认领 引用 被引量：11
11
作者 龙旭 卢莹磊 +4 位作者 王珂莹 刘靖丽 张严磊 郭惠 唐于平 《中草药》 CAS CSCD 北大核心 2025年第6期1877-1887,共11页
打破深度依存化石能源的“高碳”发展模式,优化能源结构,开发独具行业特色的中药固体废弃物能源,是实现“双碳”战略目标和废弃物资源循环利用的前提和保障。针对制药行业低碳发展和能源转型的需求,结合中药固体废弃物排放和处理不当导... 打破深度依存化石能源的“高碳”发展模式,优化能源结构,开发独具行业特色的中药固体废弃物能源,是实现“双碳”战略目标和废弃物资源循环利用的前提和保障。针对制药行业低碳发展和能源转型的需求,结合中药固体废弃物排放和处理不当导致资源浪费和环境污染的棘手问题,明确能源结构转型对制药行业实现“双碳”目标的重要性。通过探讨中药固体废弃物来源、资源成分和资源再利用技术的优缺点,阐明中药固体废弃物能源化利用在实现制药行业可再生能源开发和废弃物无害化、资源化利用中的重要作用。此外,从政策法规、技术、市场需求和成本效益等方面对中药固体废弃物能源化的机遇和挑战进行深入分析,为中药行业低碳能源化发展提供参考。 展开更多
关键词 中药固体废弃物 能源 循环利用 碳中和 低碳发展
暂未订购 下载PDF
“双碳”背景下热解气化技术在中药固体废弃物制燃气中的应用与探索 认领 引用 被引量：1
12
作者 卢莹磊 龙旭 +3 位作者 王珂莹 刘靖丽 张严磊 唐于平 《中国中药杂志》 CAS CSCD 北大核心 2025年第6期1437-1448,共12页
“双碳”背景下,将来源广泛、可再生、产量丰富的中药固体废弃物热解气化制燃气,再循环供给制药生产,是实现中药行业能源结构优化和开发使用可再生能源的重要举措。从内因(原料特性,如含水量、粒径、灰分和形态等)和外因(热解操作条件... “双碳”背景下,将来源广泛、可再生、产量丰富的中药固体废弃物热解气化制燃气,再循环供给制药生产,是实现中药行业能源结构优化和开发使用可再生能源的重要举措。从内因(原料特性,如含水量、粒径、灰分和形态等)和外因(热解操作条件、当量比、气化炉和气化剂等)2个方面详细评述中药固体废弃物热解气化技术的研究现状。针对中药固体废弃物存在原料分散、资源多样、气化过程复杂、气化炉性能差异大等缺陷进行详细分析,进而提出改进措施,以期为中药资源循环经济发展、中药行业低碳能源开发和利用提供研究思路。 展开更多
关键词 中药固体废弃物 资源利用 热解 气化 燃气
暂未订购 下载PDF
我国海洋保护地建设面临的困难及应对措施 认领 引用 被引量：1
13
作者 江南 黄琪琦 +2 位作者 龙旭 束承继 徐卫华 《国家公园（中英文）》 CSCD 2025年第9期556-565,共10页
海洋保护地作为海洋综合管理的重要空间手段,在维护海洋生物多样性和恢复退化生境方面的作用获得广泛认可。然而,来自规划布局、管理能力与社会意愿等的多维障碍仍制约其保护成效的充分发挥。基于“障碍识别-系统评估-行动响应”的分析... 海洋保护地作为海洋综合管理的重要空间手段,在维护海洋生物多样性和恢复退化生境方面的作用获得广泛认可。然而,来自规划布局、管理能力与社会意愿等的多维障碍仍制约其保护成效的充分发挥。基于“障碍识别-系统评估-行动响应”的分析框架,选取我国40处海洋保护地开展实证研究,系统识别当前我国海洋保护地建设过程中面临的主要困难类型及其影响因素,并对不同应对策略的作用对象与覆盖范围进行对比分析。研究结果显示,65%的受访者认为资源障碍对我国海洋保护地发展的制约程度高于治理障碍与意愿障碍。进一步分析发现,在调研样本中,约40%的保护地处于“弱保护”水平,其资源约束问题较为突出;而其余60%的“强保护”区域,更多面临来自各方意愿协同的挑战。针对海洋保护地建设与管理中存在的问题,需在申报、创建及管理的各个环节采取针对性措施;既要提升管理机构的能力和水平,也需政府决策者、利益相关者以及社会公众等多个层面协同发力。 展开更多
关键词 海洋保护地 实证研究 管理 障碍 对策
暂未订购 下载PDF
Initial misdiagnosis of gastritis cystica profunda:Two case reports 认领 引用
14
作者 Xiao-Li Zheng Long Xu Jun Wang 《World Journal of Clinical Cases》 2025年第24期66-71,共6页
Gastritis cystica profunda(GCP)is a rare gastric disorder.It is characterized by non-specific symptoms and diagnostic complexity.This case report enriches the medical literature by highlighting challenges in diagnosin... Gastritis cystica profunda(GCP)is a rare gastric disorder.It is characterized by non-specific symptoms and diagnostic complexity.This case report enriches the medical literature by highlighting challenges in diagnosing and treating GCP.CASE SUMMARY Two patients presented with non-specific abdominal symptoms,such as abdominal distension and epigastric discomfort.Initial misdiagnosis occurred due to GCP’s non-typical manifestations.After thorough investigations,GCP was diagnosed.Endoscopic mucosal resection and endoscopic submucosal dissection were carried out.Both patients recovered uneventfully.CONCLUSION GCP diagnosis demands caution,and endoscopic treatment is effective. 展开更多
关键词 Gastritis cystica profunda Submucosal tumor Gastric polyp Misdiagnosis Endoscopic resection Histopathological examination Case report
暂未订购 下载PDF
Adaptive scale model reconstruction for radio synthesis imaging 认领 引用 被引量：3
15
作者 Li Zhang Li-Gong Mi +6 位作者 Long Xu Ming Zhang Dan-Yang Li Xiang Liu Feng Wang Yi-Fan Xiao Zhong-Zu Wu 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2021年第3期117-127,共11页
A sky model from CLEAN deconvolution is a particularly effective high dynamic range reconstruction in radio astronomy,which can effectively model the sky and remove the sidelobes of the point spread function(PSF)cause... A sky model from CLEAN deconvolution is a particularly effective high dynamic range reconstruction in radio astronomy,which can effectively model the sky and remove the sidelobes of the point spread function(PSF)caused by incomplete sampling in the spatial frequency domain.Compared to scale-free and multi-scale sky models,adaptive-scale sky modeling,which can model both compact and diffuse features,has been proven to have better sky modeling capabilities in narrowband simulated data,especially for large-scale features in high-sensitivity observations which are exactly one of the challenges of data processing for the Square Kilometre Array(SKA).However,adaptive scale CLEAN algorithms have not been verified by real observation data and allow negative components in the model.In this paper,we propose an adaptive scale model algorithm with non-negative constraint and wideband imaging capacities,and it is applied to simulated SKA data and real observation data from the Karl G.Jansky Very Large Array(JVLA),an SKA precursor.Experiments show that the new algorithm can reconstruct more physical models with rich details.This work is a step forward for future SKA image reconstruction and developing SKA imaging pipelines. 展开更多
关键词 methods:data analysis techniques:image processing techniques:interferometric
暂未订购 下载PDF
金丝桃苷电化学传感器创新实验教学设计 认领 引用
16
作者 李小蓉 龙旭 +2 位作者 闫浩 李佳佳 任艳茹 《实验室研究与探索》 CAS 北大核心 2025年第4期167-172,178,共6页
设计了基于纳米镍-多壁碳纳米管复合材料的电化学传感器测定金丝桃苷含量的创新实验。采用扫描电镜观察了修饰电极的表面形貌,用电化学阻抗谱研究了修饰电极的电化学性能,对实验条件进行了优化并用差分脉冲伏安法对金丝桃苷的含量进行... 设计了基于纳米镍-多壁碳纳米管复合材料的电化学传感器测定金丝桃苷含量的创新实验。采用扫描电镜观察了修饰电极的表面形貌,用电化学阻抗谱研究了修饰电极的电化学性能,对实验条件进行了优化并用差分脉冲伏安法对金丝桃苷的含量进行了检测。在最佳条件下,传感器对金丝桃苷响应的线性范围为30~100.0nmol·L-1,检出限达到1.6nmol·L-1。该传感器导电性好、灵敏度高、制作简单,将其用于黄蜀葵花中金丝桃苷含量的测定,回收率为98.3%~103.9%,具有一定的应用潜能。该实验集纳米材料和电化学传感器制备、中药有效成分的含量测定于一体,充分体现了创新型实验教学在激发学生的科研热情,培养学生创新思维、探究精神和科研素养中所起的重要作用。 展开更多
关键词 电化学传感器 纳米镍 多壁碳纳米管 金丝桃苷 创新实验
暂未订购 下载PDF
中国破伤风疾病负担:1990年—2021年趋势及2050年预测 认领 引用
17
作者 刘梦龙 龙旭 +6 位作者 王桂霞 李思琪 孙田静 周丹丹 姜栩恒 喻安永 段海真 《华西医学》 CAS 2025年第11期1788-1793,共6页
目的探讨过去30年中国破伤风疾病负担的长期趋势及其流行病学特征,预测2050年疾病负担,以全面评估中国破伤风的疾病负担。方法利用2021年全球疾病负担研究的方法和成果,依据患病率、发病率、死亡率、伤残调整生命年、伤残损失生命年以... 目的探讨过去30年中国破伤风疾病负担的长期趋势及其流行病学特征,预测2050年疾病负担,以全面评估中国破伤风的疾病负担。方法利用2021年全球疾病负担研究的方法和成果,依据患病率、发病率、死亡率、伤残调整生命年、伤残损失生命年以及早死损失生命年等关键指标,对中国破伤风的疾病负担进行详细描述。采用Joinpoint回归分析、年龄-时期-队列分析、分解分析以及贝叶斯年龄-时期-队列模型,进一步阐明破伤风的流行病学特征并预测2050年中国破伤风的疾病负担。结果1990年—2021年间,中国破伤风的疾病负担总体呈显著逐年下降趋势。中国承担破伤风疾病负担的主要人群已逐渐从新生儿转变为中老年人,且男性大于女性。分解分析结果表明流行病学变化为中国破伤风的重要因素,人口及老龄化的影响较小。根据贝叶斯年龄-时期-队列模型的预测,到2050年,仅患病率会略有上升,而其他所有指标均有望下降并维持在较低水平。结论1990年—2021年中国破伤风疾病负担大幅降低,后期预防应将新生儿和中老年人作为重点防控对象,以将破伤风的疾病负担保持在较低水平。 展开更多
关键词 破伤风 疾病负担 Joinpoint回归分析 年龄-时期-队列研究 流行病学 贝叶斯年龄-年龄-时期队列模型
暂未订购 下载PDF
Deconvolution with hybrid parameterizations for radio emission reconstruction 认领 引用
18
作者 Li Zhang Long Xu +5 位作者 Li-Gong Mi Ming Zhang Xiang Liu Feng Wang Yun-Jun Ruan Dan-Yang Li 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2021年第4期287-296,共10页
Deconvolution is used to eliminate imperfections in the point spread function,such as sidelobes caused by incomplete sampling of radio telescopes,and is a key technology for radio synthesis imaging.Modern telescopes h... Deconvolution is used to eliminate imperfections in the point spread function,such as sidelobes caused by incomplete sampling of radio telescopes,and is a key technology for radio synthesis imaging.Modern telescopes have such high sensitivities that the observed celestial images may contain both compact and diffuse emission.This essentially requires deconvolution technology to have the ability to model both.In this paper,a deconvolution algorithm based on hybrid parameterization is proposed for the rapid reconstruction of complex celestial structures.In this algorithm,scale-free parameterization is utilized to reconstruct compact emission,while multi-scale parameterization is employed to reconstruct diffuse emission.Simulated data representing Square Kilometre Array(SKA)observations with realistic celestial brightness distributions are applied to test the performance of the algorithm.Our experiments show that,compared with other state-of-the-art deconvolution algorithms,the algorithm proposed in this paper can reconstruct complex celestial structures well and provide competitive reconstruction results while greatly improving the reconstruction speed. 展开更多
关键词 methods:data analysis techniques:image processing techniques:interferometric
暂未订购 下载PDF
LSTM neural network for solar radio spectrum classification 认领 引用 被引量：11
19
作者 Long Xu Yi-Hua Yan +3 位作者 Xue-Xin Yu Wei-Qiang Zhang Jie Chen Ling-Yu Duan 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2019年第9期137-148,共12页
A solar radio spectrometer records solar radio radiation in the radio waveband.Such solar radio radiation spanning multiple frequency channels and over a short time period could provide a solar radio spectrum which is... A solar radio spectrometer records solar radio radiation in the radio waveband.Such solar radio radiation spanning multiple frequency channels and over a short time period could provide a solar radio spectrum which is a two dimensional image.The vertical axis of a spectrum represents frequency channel and the horizontal axis signifies time.Intrinsically,time dependence exists between neighboring columns of a spectrum since solar radio radiation varies continuously over time.Thus,a spectrum can be treated as a time series consisting of all columns of a spectrum,while treating it as a general image would lose its time series property.A recurrent neural network(RNN)is designed for time series analysis.It can explore the correlation and interaction between neighboring inputs of a time series by augmenting a loop in a network.This paper makes the first attempt to utilize an RNN,specifically long short-term memory(LSTM),for solar radio spectrum classification.LSTM can mine well the context of a time series to acquire more information beyond a non-time series model.As such,as demonstrated by our experimental results,LSTM can learn a better representation of a spectrum,and thus contribute better classification. 展开更多
关键词 deep learning long short-term memory(LSTM) classification solar radio spectrum solar burst detection
暂未订购 下载PDF
Experimental study of enhanced oil recovery by CO2 huff-n-puff in shales and tight sandstones with fractures 认领 引用 被引量：16
20
作者 Chao-Fan Zhu Wei Guo +4 位作者 You-Ping Wang Ya-Jun Li Hou-Jian Gong Long Xu Ming-Zhe Dong 《Petroleum Science》 SCIE EI CAS CSCD 2021年第3期852-869,共18页
The fractures and kerogen,which generally exist in the shale,are signifcant to the CO2 huf-n-puf in the shale reservoir.It is important to study the efects of fractures and kerogen on oil recovery during CO2 huf... The fractures and kerogen,which generally exist in the shale,are signifcant to the CO2 huf-n-puf in the shale reservoir.It is important to study the efects of fractures and kerogen on oil recovery during CO2 huf-n-puf operations in the fracture-matrix system.In this study,a modifed CO2 huf-n-puf experiment method is developed to estimate the recovery factors and the CO2 injectivity in the fractured organic-rich shales and tight sandstones.The efects of rock properties,injection pressure,and injection time on the recovery factors and CO2 usage efciency in shales and sandstones are discussed,respectively.The results show that although the CO2 injectivity in the shale is higher than that in the sandstone with the same porosity;besides,the recovery factors of two shale samples are much lower than that of two sandstone samples.This demonstrates that compared with the tight sandstone,more cycles are needed for the shale to reach a higher recovery factor.Furthermore,there are optimal injection pressures(close to the minimum miscible pressure)and CO2 injection volumes for CO2 huf-npuf in the shale.Since the optimal CO2 injection volume in the shale is higher than that in the sandstone,more injection time is needed to enhance the oil recovery in the shale.There is a reference sense for CO2 huf-n-puf in the fractured shale oil reservoir for enhanced oil recovery(EOR)purposes. 展开更多
关键词 Shale Tight sandstone CO2huf-n-puf Fracture Injectivity of CO2
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 7 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈