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Two-grating compressor for sub-exawatt lasers:Optimal design for highest focal intensity 认领 引用
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作者 Efim Khazanov Zhaoyang Li 《Matter and Radiation at Extremes》 SCIE EI CAS CSCD 2026年第3期13-26,共14页
The generation of exawatt-class lasers,as well as high focal intensities,is an important goal in ultra-intense laser physics,and grating compressors are the key devices for achieving this goal.Since large-size diffrac... The generation of exawatt-class lasers,as well as high focal intensities,is an important goal in ultra-intense laser physics,and grating compressors are the key devices for achieving this goal.Since large-size diffraction gratings are not perfectly plane,any grating compressor inevitably introduces spatiotemporal coupling phase distortions,which reduce the focal intensity of an ultra-intense laser.In this paper,we show that the dependence of the focal intensity on the root mean square(RMS)grating surface roughness is Gaussian and that for RMS roughness below 10 nm,the focal intensity decrease is negligible,giving an RMS requirement of gratings for ultra-intense lasers.In a two-grating compressor,the impact of the large-scale part of the grating surface profiles may be negligible,because it can be completely eliminated by use of two adaptive mirrors.However,in a four-grating compressor,such elimination is almost impossible.On the basis of a complete analytical model and an improved numerical code,we study the grating compressors of two sub-exawatt laser projects(XCELS and SEL-100PW),and the results show that a two-grating compressor is the best choice for exawatt-class ultra-intense lasers such as XCELS,SEL-100PW,and OPAL.This work also provides a basis for compressor grating fabrication as part of the further development of ultra-intense lasers. 展开更多
关键词 reduce focal intensity ultra intense lasers spatiotemporal coupling phase distortionswhich focal intensity grating surface roughness grating compressors two grating compressor
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Multimodal imaging findings of focal scleral nodule(solitary idiopathic choroiditis)in three cases 认领 引用
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作者 Ahmet Kaan Gündüz Ibadulla Mirzayev +1 位作者 Halil Ibrahim Aydoğdu Diğdem Tetik 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2026年第7期1420-1423,共4页
Dear Editor,Herein,we report multimodal imaging findings in three cases of focal scleral nodule(FSN).The term“unifocal helioid choroiditis”was initially proposed by Hong[1]in 1997 to describe idiopathic solitary cho... Dear Editor,Herein,we report multimodal imaging findings in three cases of focal scleral nodule(FSN).The term“unifocal helioid choroiditis”was initially proposed by Hong[1]in 1997 to describe idiopathic solitary choroidal lesions in 6 cases.In 2002,Shields et al[2]reported 60 similar cases,coining the term“solitary idiopathic choroiditis”.With the advent of enhanced depth imaging optical coherence tomography(EDI-OCT),these lesions were shown to arise in the sclera rather than the choroid.A 2020 multicenter study proposed renaming solitary idiopathic choroiditis as FSN based on multimodal imaging observations including EDI-OCT in 63 cases[3]. 展开更多
关键词 focal scleral nodule fsn enhanced depth imaging optical coherence tomography edi oct idiopathic choroiditis idiopathic solitary choroiditis idiopathic solitary choroidal lesions unifocal helioid choroiditis multimodal imaging findings focal scleral nodule
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Pulse-shaped femtosecond-laser-modified Si:S photodetector for ultrawide-spectrum focal plane arrays and weak-light detection 认领 引用
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作者 Jiaxin Cao Ziyang Zheng +3 位作者 Xu Zhou Guanting Song Qiang Wu Jingjun Xu 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第3期840-853,共14页
High-performance Si photodetectors featuring an ultrawide spectral range can be realized through femtosecond(fs)-laser modification,enabling their broad application in focal plane arrays(FPAs)for artificial intelligen... High-performance Si photodetectors featuring an ultrawide spectral range can be realized through femtosecond(fs)-laser modification,enabling their broad application in focal plane arrays(FPAs)for artificial intelligence and complex operational scenarios.However,laser-induced surface inhomogeneity and elevated dark currents reduce the signal-to-noise ratio of FPAs in image detector arrays.To address these challenges,a pulse-shaping technique is employed here to precisely control light-matter interactions during laser modification.This approach not only improves the uniformity of surface microstructures but also significantly suppresses dark currents.The optimized device exhibits high responsivity across the visible to near-infrared spectrum,with a peak responsivity of 164.17 A·W-1 at−2.5 V.Notably,the photodetector demonstrates exceptional weak-light detection capacity at room temperature owing to its record-high specific detectivity of 1.71×1014 Jones,surpassing that of all previously reported Si-based photodetectors.These results highlight substantial advancements in the application of fs-laser-modified Si photodetectors,underscoring their potential in fields such as autonomous driving,weak-light detection,and medical monitoring. 展开更多
关键词 femtosecond laser modification pulse shaping visible-near-infrared Si photodetector weak-light detection infrared detection focal plane arrays
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Correction to“Synergism of calycosin and bone marrow-derived mesenchymal stem cells to combat podocyte apoptosis to alleviate adriamycin-induced focal segmental glomerulosclerosis” 认领 引用
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作者 Qiong-Dan Hu Rui-Zhi Tan +4 位作者 Yuan-Xia Zou Jian-Chun Li Jun-Ming Fan Fahsai Kantawong Li Wang 《World Journal of Stem Cells》 SCIE 2026年第2期114-117,共4页
This is an erratum to the published paper entitled“Synergism of calycosin and bone marrow-derived mesenchymal stem cells to combat podocyte apoptosis to alleviate adriamycin-induced focal segmental glomerulosclerosis... This is an erratum to the published paper entitled“Synergism of calycosin and bone marrow-derived mesenchymal stem cells to combat podocyte apoptosis to alleviate adriamycin-induced focal segmental glomerulosclerosis”.Upon reexamining our original data,we have identified an error in the assembly of Figure 1F,where the glyceraldehyde-3-phosphate dehydrogenase loading control image was incorrectly placed due to a clerical oversight during figure preparation.This does not reflect any issue with the underlying experimental data. 展开更多
关键词 Correction Calycosin Mesenchymal stem cells Focal segmental glomerulosclerosis Apoptosis Smad3
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Retinopathy and focal segmental glomerulosclerosis are not uncommon phenotypic features in m.3243A>G carriers 认领 引用
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作者 Josef Finsterer 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2026年第8期1655-1656,共2页
Dear Editor,We read with interest the article by Liu et al[1]on a 28-year-old woman with mitochondrial encephalopathy,lactic acidosis syndrome,and strokelike syndrome(MELAS)due to the m.3243A>G variant confirmed in... Dear Editor,We read with interest the article by Liu et al[1]on a 28-year-old woman with mitochondrial encephalopathy,lactic acidosis syndrome,and strokelike syndrome(MELAS)due to the m.3243A>G variant confirmed in blood lymphocytes.The MT-TL1 variant manifested clinically with focal segmental glomerulosclerosis(FSGS),which required hemodialysis,heart failure,arterial hypertension,and hearing impairment[1].Although the patient reported no visual symptoms,ophthalmological examination revealed changes in the perimacular and peripapillary retinal pigment epithelium(RPE)[1].The study is noteworthy,but some points require discussion. 展开更多
关键词 focal segmental glomerulosclerosis fsgs which mitochondrial encephalopathylactic acidosis syndromeand focal segmental glomerulosclerosis lactic acidosis retinopathy mitochondrial encephalopathy stroke syndrome strokelike syndrome melas due
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Determination of focal depths for the 2024 M 7.3 Hualien offshore and 2025 M 6.2 Tainan earthquakes in Taiwan,China:An enhanced method based on sPn phase and waveform cross-correlation techniques 认领 引用
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作者 Huifang Chen Binhua Lin +2 位作者 Tairan Xu Yanming Zhang Yuanhong Yang 《Earthquake Research Advances》 CAS CSCD 2026年第1期17-24,共8页
This study proposes a method for determining earthquake focal depths by combining the sPn phase with the waveform cross-correlation technique,based on waveform data recorded by the Fujian Seismic Network from the 2024... This study proposes a method for determining earthquake focal depths by combining the sPn phase with the waveform cross-correlation technique,based on waveform data recorded by the Fujian Seismic Network from the 2024 M 7.3 Hualien offshore earthquake and the 2025 M 6.2 Tainan earthquake.The Pn phase onset was precisely aligned using waveform cross-correlation,and the arrival time difference(Δt)between the sPn and Pn phases was extracted via a sliding time-window correlation method.The focal depths were derived using a layered velocity model for the Taiwan region.Results show that the calculated focal depth for the Hualien earthquake is 23.1 km(Δt=6.9 s),with a relative error of 2.7%compared to the official result(22.5 km)from the Central Weather Administration of Taiwan.For the Tainan earthquake,the depth is 17.9 km(Δt=6.1 s),with a relative error of 13.3%.In this study,we show that a cross-correlation threshold of 0.8 and a bandpass filtering of 0.1–0.3 Hz are efficient to suppress noise and significantly improve depth accuracy for shallow earthquakes with depth<30 km.Compared to traditional travel-time location methods,this approach exhibits superior noise resistance and computational efficiency.Future work will focus on optimizing 3D velocity structures,integrating multiple phases,and applying deep learning techniques such as convolutional neural networks,aiming to improve the results in a more reliable and automatic way,and to provide efficient support on earthquake emergency response. 展开更多
关键词 M 7.3 Hualien earthquake M 6.2 Tainan earthquake sPn phase Focal depth Waveform cross-correlation Sliding time-window correlation method
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Focal mechanism and radiated energy determination of the MS7.9 earthquake in Myanmar on March 28,2025 认领 引用
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作者 Zan Li Ruifeng Liu +2 位作者 Zhe Zhang Zibo Wang Yixiao Zhang 《Earthquake Science》 CAS CSCD 2026年第3期311-322,共12页
On March 28, 2025, an MS7.9 earthquake occurred in the Himalayan-Myanmar Arc at the junction of the Indian Plate and the Eurasian Plate. Utilizing broadband waveform data provided by the Global Seismographic Networ... On March 28, 2025, an MS7.9 earthquake occurred in the Himalayan-Myanmar Arc at the junction of the Indian Plate and the Eurasian Plate. Utilizing broadband waveform data provided by the Global Seismographic Network, this study adopted the Wphase method and the P-wave first-motion polarity method to invert the centroid-moment-tensor and fault plane solutions of this earthquake. Additionally, the far-field point source model, global attenuation model, and energy flux density method were used to determine the radiated energy of this earthquake. The energy-moment ratio, apparent stress, stress drop, and radiated energy enhancement factor were also calculated based on the measured seismic moment. The main findings are as follows:(1) this event was a strike-slip earthquake with steeply dipping faults. The focal mechanism solution yielded two nodal planes: Plane Ⅰ(strike 358°, dip 70°, rake-175°) and Plane Ⅱ(strike 266°, dip 85°, rake-20°). The seismic moment of 4.94 × 1020 N·m corresponds to a moment magnitude of 7.7. The centroid was located at 21.21°N and 95.92°E and a depth of 35.0 km. The centroid time was 35 s.(2) The radiated seismic energy was 2.6 × 1016 J, which was converted to an energy magnitude of 8.0,higher than the moment magnitude.(3) The energy-moment ratio was 5.3 × 10-5, apparent stress was 1.58 MPa, stress drop was6.79 MPa, and radiated energy enhancement factor describing the complexity of fault rupture was calculated as 113.(4) In summary, the Myanmar earthquake is a strike-slip earthquake, characterized by steeply dipping faults and highly efficient energy release. Compared with earthquakes of the same magnitude, such earthquakes have a greater destructive power on local buildings and infrastructure, increasing the likelihood of severe disasters. 展开更多
关键词 MS7.9 Myanmar earthquake focal mechanism radiated seismic energy W-phase inversion energy flux density method
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基于Swin-Transformer与Focal Loss的不平衡图像分类网络及实验研究 认领 引用
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作者 刘亚楠 《重庆电力高等专科学校学报》 2026年第3期37-41,共5页
图像分类是计算机视觉核心任务,而不平衡数据分布是制约模型性能的关键瓶颈。提出基于Swin-Transformer与改进Focal Loss的FL-Swin图像分类网络,优化模型训练,以提升少样本识别能力。实验结果表明,在自建的喉癌病理图像数据集上(LCPD6S)... 图像分类是计算机视觉核心任务,而不平衡数据分布是制约模型性能的关键瓶颈。提出基于Swin-Transformer与改进Focal Loss的FL-Swin图像分类网络,优化模型训练,以提升少样本识别能力。实验结果表明,在自建的喉癌病理图像数据集上(LCPD6S),与多种SOTA网络模型对比,FL-Swin模型平均类别准确率达93.03%,平均Macro F1值达0.9354,分类性能显著优于对比模型,在不平衡数据场景下具有较强的泛化能力。 展开更多
关键词 图像分类 不平衡数据集 特征提取 Swin-Transformer Focal Loss
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Method and Application of Stress Inversion based on Strike,Dip,and Rake Data from Microseismic Focal Mechanisms and Fracture Network 认领 引用
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作者 Chao Xu Ruizhao Yang +3 位作者 Zhengguang Zhao Bin Guan Lin Yang Le He 《Applied Geophysics》 SCIE CSCD 2026年第1期214-225,431,共12页
The hydraulic fracturing of horizontal wells is a key stimulation technology for unconventional tight oil/gas reservoirs.Good knowledge of the near-well stress eld of a horizontal well can be helpful for the hydraulic... The hydraulic fracturing of horizontal wells is a key stimulation technology for unconventional tight oil/gas reservoirs.Good knowledge of the near-well stress eld of a horizontal well can be helpful for the hydraulic fracture design optimization of new wells and refrac design optimization of fractured wells.Azimuth and dip data derived from either focal mechanisms of hydraulic fracturing-induced microseismic events or fracture attributes of hydraulic fracture networks can be used for new-well stress eld inversion.In this work,we present a novel stress inversion method integrating azimuth,dip,and rake data from the focal mechanisms of hydraulically induced microseismic events and fracture attributes of hydraulic fracture networks.For those stages having sufcient reliable microseismic focal mechanisms,strike,dip,and rake data derived from microseismic focal mechanisms are taken as input data for stress inversion.Meanwhile,for those stages that have no microseismic events or insufficient reliable microseismic focal mechanisms,azimuth and dip data derived from fracture attributes of prebuilt hydraulic fracture network are used for stress inversion,along with azimuth,dip,and rake data derived from other stages with sufcient reliable microseismic focal mechanisms.Thus,the near-well stress eld of each stage can be inverted,regardless of whether or not it has hydraulically induced microseismic events.The new method has been applied in the eld surface microseismic dataset during hydraulic fracture stimulation.The results reveal that the inverted near-well stress elds are consistent with the stress orientation derived from shear-wave splitting analysis for sonic logs.This nding demonstrates that the stress inversion method based on strike,dip,and rake data derived from microseismic focal mechanisms and fracture networks can correctly obtain the azimuths of maximum and minimum horizontal stress. 展开更多
关键词 stress inversion microseismic focal mechanisms hydraulic fracture network
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A multi-attention mechanism U-Net neural network for image correction of PbS quantum dot focal plane detectors 认领 引用
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作者 WANG Han-Ting DI Yun-Xiang +10 位作者 QI Xing-Yu SHA Ying-Zhe WANG Ya-Hui YE Ling-Feng TANG Wei-Yi BA Kun WANG Xu-Dong HUANG Zhang-Cheng CHU Jun-Hao SHEN Hong WANG Jian-Lu 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2026年第1期148-156,共9页
Near-infrared image sensors are widely used in fields such as material identification,machine vision,and autonomous driving.Lead sulfide colloidal quantum dot-based infrared photodiodes can be integrated with sil⁃icon... Near-infrared image sensors are widely used in fields such as material identification,machine vision,and autonomous driving.Lead sulfide colloidal quantum dot-based infrared photodiodes can be integrated with sil⁃icon-based readout circuits in a single step.Based on this,we propose a photodiode based on an n-i-p structure,which removes the buffer layer and further simplifies the manufacturing process of quantum dot image sensors,thus reducing manufacturing costs.Additionally,for the noise complexity in quantum dot image sensors when capturing images,traditional denoising and non-uniformity methods often do not achieve optimal denoising re⁃sults.For the noise and stripe-type non-uniformity commonly encountered in infrared quantum dot detector imag⁃es,a network architecture has been developed that incorporates multiple key modules.This network combines channel attention and spatial attention mechanisms,dynamically adjusting the importance of feature maps to en⁃hance the ability to distinguish between noise and details.Meanwhile,the residual dense feature fusion module further improves the network's ability to process complex image structures through hierarchical feature extraction and fusion.Furthermore,the pyramid pooling module effectively captures information at different scales,improv⁃ing the network's multi-scale feature representation ability.Through the collaborative effect of these modules,the network can better handle various mixed noise and image non-uniformity issues.Experimental results show that it outperforms the traditional U-Net network in denoising and image correction tasks. 展开更多
关键词 PbS quantum dot focal plane detector convolutional neural networks image denoising U-Net
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FNDC5 enhances quercetin-induced anoikis in pancreatic adenocarcinoma cells via focal adhesion kinase-dependent mechanisms 认领 引用
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作者 Hui-Feng Gao Ke Zhang +2 位作者 Chien-Shan Cheng Ye-Hua Shen Hao Chen 《World Journal of Gastrointestinal Oncology》 SCIE 2026年第5期291-304,共14页
BACKGROUND The role of FNDC5/irisin in regulating sensitivity to pancreatic ductal adenocarcinoma(PAAD)chemotherapy remains unclear.AIM To explore the role of FNDC5/irisin in regulating sensitivity to PAAD chemotherap... BACKGROUND The role of FNDC5/irisin in regulating sensitivity to pancreatic ductal adenocarcinoma(PAAD)chemotherapy remains unclear.AIM To explore the role of FNDC5/irisin in regulating sensitivity to PAAD chemotherapy.METHODS The prognostic significance of FNDC5 was analyzed using bioinformatics.PAAD cells with FNDC5 overexpression,treated with quercetin,and control cells were compared in vitro.Cell proliferation was measured by real-time cellular analysis and colony formation assays,while apoptosis and anoikis were assessed flow cytometry.Protein expression was determined by western blotting,gene expression was determined by real-time quantitative polymerase chain reaction,and mitochondrial membrane potential was determined using the JC-1 method.FNDC5 suppressed the focal adhesion kinase(FAK)/phosphatidylinositol 3-kinase/protein kinase B pathway,leading to mitochondrial-dependent apoptosis and anoikis through modulation of apoptosis-related proteins.CONCLUSION Our findings suggest that the FNDC5/FAK axis as a novel regulator of anoikis sensitivity in PAAD.Targeting this axis may represent a promising strategy to enhance the efficacy of quercetin and other natural compounds,offering a potential therapeutic approach to overcome chemoresistance in this aggressive malignancy. 展开更多
关键词 FNDC5 Irisin Quercetin Pancreatic ductal adenocarcinoma Anoikis Focal adhesion kinase Mitochondrial apoptosis Chemosensitivity
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Five-year follow-up sustained remission with rituximab in a patient with focal segmental glomerulosclerosis:A case report 认领 引用
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作者 Ana Flávia Moura Paulo Novis Rocha +2 位作者 Daniela Moura-Landim Jose A Moura Jr Jose A Moura-Neto 《World Journal of Nephrology》 2026年第1期257-264,共8页
BACKGROUND Focal segmental glomerulosclerosis(FSGS)represents a major cause of nephrotic syndrome,with glucocorticoids constituting first-line therapy.When patients develop steroid dependence or resistance,calcineurin... BACKGROUND Focal segmental glomerulosclerosis(FSGS)represents a major cause of nephrotic syndrome,with glucocorticoids constituting first-line therapy.When patients develop steroid dependence or resistance,calcineurin inhibitors(CNIs)serve as effective alternatives.However,CNI dependence or resistance may emerge,and prolonged use of either steroid or CNI therapy carries substantial toxicity risks.These limitations create an unmet need for safer treatments capable of maintaining durable remission.CASE SUMMARY The patient initially presented with acute anasarca,nephrotic-range proteinuria(5.6 g/24 hours),hypoalbuminemia(2.1 g/dL),and preserved renal function.She experienced repeated relapses after corticosteroid and cyclosporine tapering,ultimately exhibiting a steroid-and CNI-dependent disease course.Rituximab was administered as two 1 g infusions 14 days apart,resulting in complete remission sustained for five years.CONCLUSION This case contributes to the growing evidence supporting rituximab’s therapeutic potential in adult FSGS,while highlighting the need for randomized controlled trials to establish its efficacy and optimal use in this challenging patient population. 展开更多
关键词 Glomerulonephritis Glomerulosclerosis Focal segmental glomerulosclerosis Proteinuria Rituximab Case report
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基于SMOTE与Focal Loss的医保欺诈集成识别算法优化研究 认领 引用
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作者 邹竞慷 石玲 +2 位作者 窦成皓 宗科 吴思涵 《中国新技术新产品》 2026年第6期37-40,共4页
医保欺诈问题在我国越来越严重,现有的检测工具难以处理不平衡数据。针对医保欺诈识别中存在的数据类别不平衡的问题,本文提出一种融合SMOTE过采样与Focal Loss损失函数的集成优化算法。结果表明,与传统算法相比,改进算法的精确度较高,... 医保欺诈问题在我国越来越严重,现有的检测工具难以处理不平衡数据。针对医保欺诈识别中存在的数据类别不平衡的问题,本文提出一种融合SMOTE过采样与Focal Loss损失函数的集成优化算法。结果表明,与传统算法相比,改进算法的精确度较高,该算法在医疗欺诈检测方面成效显著,能有效提高医保欺诈检测的精准性。 展开更多
关键词 医保欺诈识别 数据失衡处理 SMOTE过采样 Focal Loss
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基于Focal Transformer的工业图像压缩方法 认领 引用 被引量：1
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作者 宋义宝 刘培顺 +5 位作者 罗梦祺 颜紫康 王恒涛 黄雅诗 韩荣佳 殷田 《计算机集成制造系统》 EI CSCD 北大核心 2026年第1期199-211,共13页
针对传统图像压缩算法在处理带有复杂纹理、精细结构的工业图像时难以兼顾高压缩率与高保真度的挑战,提出一种基于Focal Transformer的图像压缩方法。所提方法引入窗口式焦点自注意力机制,使模型能够有效关注图像中的微小缺陷、边缘轮... 针对传统图像压缩算法在处理带有复杂纹理、精细结构的工业图像时难以兼顾高压缩率与高保真度的挑战,提出一种基于Focal Transformer的图像压缩方法。所提方法引入窗口式焦点自注意力机制,使模型能够有效关注图像中的微小缺陷、边缘轮廓等关键特征区域,同时通过多尺度特征融合与渐进式信息聚合,高效捕捉工业图像的局部细节与全局上下文信息。此外,设计了基于注意力的信道挤压熵模型,进一步提升压缩性能。实验结果表明,相比于VVC,所提方法在Kodak、CLIC测试集上的BD-rate分别节省了9.11%、10.35%。所提方法在低比特率下能有效保留结构完整性与缺陷特征,为解决智能制造中海量图像数据的存储与传输瓶颈提供了新的有效途径,在工业视觉检测、数字孪生等领域具有应用前景. 展开更多
关键词 图像压缩 智能制造 深度学习 聚焦自注意力
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Focal Crafts高级定制工坊,升华音响艺术的无限可能 认领 引用
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作者 无 《视听前线》 2026年第4期85-86,共2页
法国高端音响品牌Focal正式揭幕旗下Focal Crafts高级定制工坊,这一专注于打造独家音频艺术品的创作空间将传统匠艺与前沿创新完美融合,让声学科技升华为传世艺术。
关键词 法国高端音响品牌 Focal Crafts 高级定制工坊
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Diagnosis of focal spots at relativistic intensity utilizing coherent radiation from laser-driven flying electron sheets 认领 引用
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作者 Shirui Xu Zhuo Pan +22 位作者 Ying Gao Jiarui Zhao Shiyou Chen Zhusong Mei Xun Chen Ziyang Peng Xuan Liu Yulan Liang Tianqi Xu Tan Song Qingfan Wu Yujia Zhang Zhipeng Liu Zihao Zhang Haoran Chen Qihang Han Jundong Shen Chenghao Hua Kun Zhu Yanying Zhao Chen Lin Xueqing Yan Wenjun Ma 《Matter and Radiation at Extremes》 SCIE EI CAS CSCD 2025年第2期16-23,共8页
Experimental validation of laser intensity is particularly important for the study of fundamental physics at extremely high intensities.However,reliable diagnosis of the focal spot and peak intensity faces huge challe... Experimental validation of laser intensity is particularly important for the study of fundamental physics at extremely high intensities.However,reliable diagnosis of the focal spot and peak intensity faces huge challenges.In this work,we demonstrate for the firs time that the coherent radiation farfiel patterns from laser–foil interactions can serve as an in situ,real-time,and easy-to-implement diagnostic for an ultraintense laser focus.The laser-driven electron sheets,curved by the spatially varying laser fiel and leaving the targets at nearly the speed of light,produce doughnut-shaped patterns depending on the shapes of the focal spot and the absolute laser intensities.Assisted by particle-in-cell simulations,we can achieve measurements of the intensity and the focal spot,and provide immediate feedback to optimize the focal spots for extremely high intensity. 展开更多
关键词 diagnosis focal spot peak intensity laser foil interactions laser fi coherent radiation farfiel patterns laser driven electron sheets experimental validation laser intensity focal spot coherent radiation
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Focal volume optics for composite structuring in transparent solids 认领 引用 被引量：3
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作者 Bo Zhang Zhuo Wang +3 位作者 Dezhi Tan Min Gu Yuanzheng Yue Jianrong Qiu 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2025年第1期357-366,共10页
Achieving high-level integration of composite micro-nano structures with different structural characteristics through a minimalist and universal process has long been the goal pursued by advanced manufacturing researc... Achieving high-level integration of composite micro-nano structures with different structural characteristics through a minimalist and universal process has long been the goal pursued by advanced manufacturing research but is rarely explored due to the absence of instructive mechanisms.Here,we revealed a controllable ultrafast laser-induced focal volume light field and experimentally succeeded in highly efficient one-step composite structuring in multiple transparent solids.A pair of spatially coupled twin periodic structures reflecting light distribution in the focal volume are simultaneously created and independently tuned by engineering ultrafast laser-matter interaction.We demonstrated that the generated composite micro-nano structures are applicable to multi-dimensional information integration,nonlinear diffractive elements,and multi-functional optical modulation.This work presents the experimental verification of highly universal all-optical fabrication of composite micro-nano structures with independent controllability in multiple degrees of freedom,expands the current cognition of ultrafast laser-based material modification in transparent solids,and establishes a new scientific aspect of strong-field optics,namely,focal volume optics for composite structuring transparent solids. 展开更多
关键词 ultrafast laser focal volume light field composite structuring transparent solids advanced manufacturing
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The seismic mechanisms and seismogenic environment of the Ms6.2 earthquake in Jishishan,Gansu,China:Evidence from relocation,focal mechanisms,and rupture processes 认领 引用 被引量：2
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作者 TaiRan Xu ZhiGao Yang +5 位作者 DanQing Dai Ming Zhi JianYong Zhang GuangBao Du Nan Xi Li Sun 《Earth and Planetary Physics》 EI CSCD 2025年第2期309-322,共14页
On December 18,2023,an Ms6.2 earthquake jolted Jishishan County in the Linxia Hui Autonomous Prefecture in Northwest China's Gansu Province,causing substantial casualties and building collapses.The earthquake o... On December 18,2023,an Ms6.2 earthquake jolted Jishishan County in the Linxia Hui Autonomous Prefecture in Northwest China's Gansu Province,causing substantial casualties and building collapses.The earthquake occurred in the Qilian Block on the northeastern border of the Qinghai-Tibet Plateau,where faults are highly active and the geological structure is complex.In this study,we utilized methods such as relocation,focal mechanism solutions,and earthquake rupture processes to describe seismogenic faults.The results indicated that the majority of aftershocks occurred at a depth of 12 km.The centroid depth of the main shock and the depth of the maximum rupture point during the rupture process were also 12 km.Various geophysical methods exhibited a high degree of consistency in depth exploration.Aftershocks were distributed mainly to the west and north of the main shock and extended in the NNW direction,primarily through unilateral rupture.The main shock was a reverse thrust event with a small dextral strike-slip component.In this study,more regional data,such as previous GPS observations,field geological observations,and the distributions of the primary stress states in the region,were also incorporated.We inferred that the main shock was triggered by the main fault at the northern margin of the Lajishan Fault and that the movement of the main fault also activated some secondary faults.The compressive forces on both sides of the Lajishan Fault Zone led to the uplift of mountain areas,accompanied by some landslides,leading to this catastrophic earthquake event.In this article,the activity relationships among the 2022 Ms6.9 Menyuan earthquake,the 2019 Ms5.7 Xiahe earthquake,and the Jishishan earthquake under the action of regional stress are also discussed.This study provides additional evidence and new ideas for exploring the seismogenic process of the Lajishan Fault Zone and has implications for future in-depth research on underground activity in this region. 展开更多
关键词 relocation focal mechanism earthquake rupture process Lajishan Fault seismic mechanism
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基于Focal LossIM-Transformer的电网虚假数据注入攻击检测 认领 引用 被引量：1
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作者 席磊 和昀 +3 位作者 李子豪 曹利锋 李宗泽 石雨凡 《南方电网技术》 CSCD 北大核心 2025年第6期26-38,共13页
虚假数据注入攻击对电力信息物理系统造成严重安全威胁。由于受到攻击样本与正常样本之间存在类别不平衡特性,导致机器学习检测方法偏向于多数类的预测,影响其对攻击的检测精度。为此,提出了基于Focal LossIM-Transformer的虚假数据... 虚假数据注入攻击对电力信息物理系统造成严重安全威胁。由于受到攻击样本与正常样本之间存在类别不平衡特性,导致机器学习检测方法偏向于多数类的预测,影响其对攻击的检测精度。为此,提出了基于Focal LossIM-Transformer的虚假数据注入攻击检测。Transformer利用其自注意力机制能够捕捉数据中的长期依赖性,进而识别不平衡的虚假数据注入攻击数据。Focal LossIM通过引入调制因子来更好地匹配虚假数据注入攻击样本的分布和特性,来增强检测方法对不平衡数据的识别能力,以提高检测方法对攻击的检测精度。通过在IEEE 14节点系统、IEEE 30节点系统和IEEE 57节点系统进行仿真,验证了所提方法的有效性。且相较于传统损失函数和其他检测方法,所提方法显示出更好的泛化能力和对少数类的识别能力,且辨识精度高、误报率低。 展开更多
关键词 电力信息物理系统 虚假数据注入攻击 不平衡数据 Transformer focal loss
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Commissioning of the 1 PW experimental area at ELI-NP using a short focal parabolic mirror for proton acceleration 认领 引用 被引量：1
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作者 M.O.Cernaianu P.Ghenuche +34 位作者 F.Rotaru L.Tudor O.Chalus C.Gheorghiu D.C.Popescu M.Gugiu S.Balascuta A.Magureanu M.Tataru V.Horny B.Corobean I.Dancus A.Alincutei T.Asavei B.Diaconescu L.Dinca D.B.Dreghici D.G.Ghita C.Jalba V.Leca A.M.Lupu V.Nastasa F.Negoita M.Patrascoiu F.Schimbeschi D.Stutman C.Ticos D.Ursescu A.Arefiev P.Tomassini V.Malka S.Gales K.A.Tanaka C.A.Ur D.Doria 《Matter and Radiation at Extremes》 SCIE EI CAS CSCD 2025年第2期35-49,共15页
High-power laser systems have opened new frontiers in scientifi research and have revolutionized various scientifi fields offering unprecedented capabilities for understanding fundamental physics and allowing unique a... High-power laser systems have opened new frontiers in scientifi research and have revolutionized various scientifi fields offering unprecedented capabilities for understanding fundamental physics and allowing unique applications.This paper details the successful commissioning of the 1 PW experimental area at the Extreme Light Infrastructure–Nuclear Physics(ELI-NP)facility in Romania,using both of the available laser arms.The experimental setup featured a short focal parabolic mirror to accelerate protons through the target normal sheath acceleration mechanism.Detailed experiments were conducted using various metallic and diamond-like carbon targets to investigate the dependence of the proton acceleration on different laser parameters.Furthermore,the paper discusses the critical role of the laser temporal profil in optimizing proton acceleration,supported by hydrodynamic simulations that are correlated with experimental outcomes.The finding underscore the potential of the ELI-NP facility to advance research in laser–plasma physics and contribute significantl to high-energy physics applications.The results of this commissioning establish a strong foundation for experiments by future users. 展开更多
关键词 nuclear physics scientifi fields short focal parabolic mirror extreme light infrastructure laser plasma physics scientifi research proton acceleration understanding fundamental physics
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