检索结果-南通市图书馆

维普期刊数据库博看期刊

Unsupervised Low-Light Image Enhancement Based on Explicit Denoising and Knowledge Distillation

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第2期82卷 2537-2554页

作者： Wenkai Zhang Hao Zhang Xianming Liu xiaoyu guo Xinzhe Wang Shuiwang Li College of Computer Science and Engineering Guilin University of TechnologyGuilin541006China Guangxi Key Laboratory of Embedded Technology and Intelligent System Guilin University of TechnologyGuilin541004China

Under low-illumination conditions, the quality of image signals deteriorates significantly, typically characterized by a peak signal-to-noise ratio (PSNR) below 10 dB, which severely limits the usability of the images. Supervised methods, which utilize paired high-low light images as training sets, can enhance the PSNR to around 20 dB, significantly improving image quality. However, such data is challenging to obtain. In recent years, unsupervised low-light image enhancement (LIE) methods based on the Retinex framework have been proposed, but they generally lag behind supervised methods by 5–10 dB in performance. In this paper, we introduce the Denoising-Distilled Retine (DDR) method, an unsupervised approach that integrates denoising priors into a Retinex-based training framework. By explicitly incorporating denoising, the DDR method effectively addresses the challenges of noise and artifacts in low-light images, thereby enhancing the performance of the Retinex framework. The model achieved a PSNR of 19.82 dB on the LOL dataset, which is comparable to the performance of supervised methods. Furthermore, by applying knowledge distillation, the DDR method optimizes the model for real-time processing of low-light images, achieving a processing speed of 199.7 fps without incurring additional computational costs. While the DDR method has demonstrated superior performance in terms of image quality and processing speed, there is still room for improvement in terms of robustness across different color spaces and under highly resource-constrained conditions. Future research will focus on enhancing the model’s generalizability and adaptability to address these challenges. Our rigorous testing on public datasets further substantiates the DDR method’s state-of-the-art performance in both image quality and processing speed.

关键词： Deep learning low-light image enhancement real-time processing knowledge distillation

Highly efficient extraction of lithium from salt lake brine by LiAl-layered double hydroxides as lithium-ion-selective capturing material

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第7期28卷 80-87页

作者： Ying Sun xiaoyu guo Shaofang Hu Xu Xiang State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

The extraction of lithium from salt lake brine in the Chinese Qaidam Basin is challenging due to its high Mg/Li and Na/Li ratios. Herein, we utilized a reaction-coupled separation technology to separate sodium and lithium ions from a high Na/Li ratio brine(Na/Li = 48.7, w/w) and extracted lithium with Li Al-layered double hydroxides(Li Al-LDHs). The Li Al-LDHs act as lithium-ion-selective capturing materials from multication brines. That is, the lithium ions selectively enter the solid phase to form Li Al-LDHs, and the sodium ions are still retained in the liquid phase. This is because the lithium ions can be incorporated into the structural vacancies of LiAl-LDHs, whereas the sodium ions cannot. The effects of reaction conditions on lithium loss and separation efficiency were investigated at both the nucleation and the crystallization stage, e.g., the nucleation rotating speed, the Li/Al molar ratio, the crystallization temperature and time, and co-existing cations. The lithium loss is as low as 3.93% under optimal separation *** sodium ions remained in the solution. Consequently, an excellent Na/Li separation efficiency was achieved by this reaction-coupled separation technology. These findings confirm that LiAl-LDHs play a critical function in selectively capturing lithium ions from brines with a high Na/Li ratio, which is useful for the extraction of lithium ions from the abundant salt lake brine resources in China.

关键词： LiAl-LDHs Lithium extraction Energy metal Salt lake brine Reaction-coupled separation technology

中拉萨地体当惹雍措锆石微量元素特征及其对地壳厚度演化的指示

在线全文

学校读者我要写书评

暂无评论

地学前缘 2025年第1期32卷 343-366页

作者：刘晓惠刘一珉丁林郭晓玉黄兴富李蕙琳高锐中国石油大学(北京)地球物理学院油气资源与工程全国重点实验室北京102249 中国科学院地质与地球物理研究所岩石圈演化与环境演变全国重点实验室北京100029 中国科学院青藏高原研究所青藏高原地球系统与资源环境重点实验室北京100101 中山大学地球科学与工程学院广东珠海519082 南方海洋科学与工程广东省实验室(珠海) 广东珠海519082 桂林理工大学地球科学学院广西桂林541004

拉萨地体位于青藏高原南部,是全球地壳厚度最大的区域之一。然而,拉萨地体地壳增厚的时间和过程仍存在一定争议。锆石的微量元素特征受控于锆石与其他微量元素载体矿物之间的共生关系,即不同矿物的分配系数不同,因此,锆石微量元素可用... 详细信息

拉萨地体位于青藏高原南部,是全球地壳厚度最大的区域之一。然而,拉萨地体地壳增厚的时间和过程仍存在一定争议。锆石的微量元素特征受控于锆石与其他微量元素载体矿物之间的共生关系,即不同矿物的分配系数不同,因此,锆石微量元素可用于定量重建地壳厚度。本研究对来自中拉萨地体当惹雍措地区的岩浆岩和沉积岩中的锆石开展了U-Pb年代学和微量元素地球化学研究。利用锆石的Eu异常对地壳厚度进行定量重建,结果显示,中拉萨地体在侏罗纪至新近纪期间,经历了两次地壳减薄(150~130和85~65 Ma)和两次地壳增厚(130~85和65~15 Ma)事件。在150~130 Ma期间,中拉萨地体地壳减薄主要与班公湖—怒江洋的板片回撤有关。在130~85 Ma期间,由于新特提斯洋向北俯冲和班公湖—怒江洋向南俯冲,中拉萨地体发生了地壳增厚。在85~65 Ma期间,新特提斯洋的板片回撤和弧后拉张导致中拉萨地体再次发生地壳减薄。在65~15 Ma,印度与亚欧板块的碰撞和后续挤压作用,导致中拉萨地体地壳再次加厚。

关键词：青藏高原中拉萨地体地壳厚度锆石U-Pb年龄锆石微量元素

Cold signaling in plants:Insights into mechanisms and regulation

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2018年第9期60卷 745-756页

作者： xiaoyu guo Dongfeng Liu Kang Chong Key Laboratory of Plant Molecular Physiology Institute of Botanythe Chinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China

To survive under cold temperatures plants must be able to perceive a cold signal and transduce it into downstream components that induce appropriate defense mechanisms. In addition to inducing adaptive defenses, such as the production of osmotic factors to prevent freezing and the reprogramming of transcriptional pathways, cold temperatures induce changes in plant growth and development which can affect the plant life cycle. In this review, we summarize recent progress in characterizing cold-related genes and the pathways that allow transduction of the cold signal in plants, focusing primarily on studies in Arabidopsis tbaliana and rice （Oryza sativa）. We summarize cold perception and signal transduction from the plasma membrane to the nucleus, which involves cold sensors, calcium signals, calciumbinding proteins, mitogen-activated protein kinase cascades, and the C-repeat binding factor/dehydrationresponsive element binding pathways, as well as trehalose metabolism. Finally, we describe the balance between plant organogenesis and cold tolerance mechanisms in rice. This review encapsulates the known cold signaling factors in plants and provides perspectives for ongoing cold signaling research.

关键词：

Effect of reclaimed water effluent on bacterial community structure in the Typha angustifolia L. rhizosphere soil of urbanized riverside wetland, China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第5期29卷 58-68页

作者： Xingru Huang Wei Xiong Wei Liu xiaoyu guo College of Resources Environment and Tourism Capital Normal University Beijing 100048 China Belting Municipal Key Laboratory of Resources Environment and GIS Beijing 100048 China Urban Environmental Processes and Digital Modeling Laboratory Beijing 100048 China Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

In order to evaluate the impact of reclaimed water on the ecology of bacterial communities in the Typha angustifolia L. rhizosphere soil, bacterial community structure was investigated using a combination of terminal restriction fragment length polymorphism and 16S rRNA gene clone library. The results revealed significant spatial variation of bacterial communities along the river from upstream and downstream. For example, a higher relative abundance of γ-Proteobacteria, Firmicutes, Chloroflexi and a lower proportion of β-Proteobacteria and ε-Proteobacteria was detected at the downstream site compared to the upstream site. Additionally, with an increase of the reclaimed water interference intensity, the rhizosphere bacterial community showed a decrease in taxon richness, evenness and diversity. The relative abundance of bacteria closely related to the resistant of heavy-metal was markedly increased, while the bacteria related for carbon/nitrogen/phosphorus/sulfur cycling wasn＇t strikingly changed. Besides that, the pathogenic bacteria markedly increased in the downstream rhizosphere soil since reclaimed water supplement, while the possible plant growth-promoting rhizobacteria obviously reduced in the downstream sediment. Together these data suggest cause and effect between reclaimed water input into the wetland, shift in bacterial communities through habitat change, and alteration of capacity for biogeochemical cycling of contaminants.

关键词： Reclaimed water T-RFLP 16S rRNA gene clone library Bacterial community structure

Relationship between the regional tectonic activity and crustal structure in the eastern Tibetan plateau discovered by gravity anomaly

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2016年第2期29卷 71-81页

作者： Xiao Xu Rui Gao xiaoyu guo Key Laboratory of Earthprobe and Geodynamics MLR Instituteof GeologyChinese Academy of Geological Sciences Sinoprobe Center Chinese Academy of Geological Sciences

The eastern Tibetan plateau has been getting more and more attention because it combines active faults,uplifting, and large earthquakes together in a high-population region. Based on the previous researches, the most of Cenozoic tectonic activities were related to the regional structure of the local blocks within the crustal scale. Thus,a better understanding of the crustal structure of the regional tectonic blocks is an important topic for further study. In this paper, we combined the simple Bouguer gravity anomaly with the Moho depths from previous studies to investigate the crustal structure in this area. To highlight the crustal structures, the gravity anomaly caused by the Moho relief has been reduced by forward modeling calculations. A total horizontal derivative（THD） had been applied on the gravity residuals. The results indicated that the crustal gravity residual is compatible with the topography and the geological settings of the regional blocks,including the Sichuan basin, the Chuxiong basin, the Xiaojiang fault, and the Jinhe fault, as well as the Longmenshan fault zone. The THD emphasized the west margin of Yangtze block, i.e., the Longriba fault zone and the Xiaojiang fault cut through the Yangtze block. The checkboard pattern of the gravity residual in the SongpanGarze fold belt and Chuandian fragment shows that the crust is undergoing a southward and SE-directed extrusion,which is coincident with the flowing direction indicatedfrom the GPS measurements. By integrating the interpretations, the stepwise extensional mechanism of the eastern Tibetan plateau is supported by the southeastward crustal deformation, and the extrusion of Chuandian fragment is achieved by Xianshuihe fault.

关键词： Eastern Tibetan plateau Tectonic activity Crustal structures Gravity anomaly

Damage Diagnosis of Bleacher Based on an Enhanced Convolutional Neural Network with Training Interference

在线全文

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2024年第3期18卷 321-339页

作者： Chaozhi Cai xiaoyu guo Yingfang Xue Jianhua Ren School of Mechanical and Equipment Engineering Hebei University of EngineeringHandan056038China

Bleachers play a crucial role in practical engineering applications, and any damage incurred during their operationposes a significant threat to the safety of both life and property. Consequently, it becomes imperative to conductdamage diagnosis and health monitoring of bleachers. The intricate structure of bleachers, the varied types ofpotential damage, and the presence of similar vibration data in adjacent locations make it challenging to achievesatisfactory diagnosis accuracy through traditional time-frequency analysis methods. Furthermore, field environmentalnoise can adversely impact the accuracy of bleacher damage diagnosis. To enhance the accuracy and antinoisecapabilities of bleacher damage diagnosis, this paper proposes improvements to the existing ConvolutionalNeural Network with Training Interference (TICNN). The result is an advanced Convolutional Neural Networkmodel with superior accuracy and robust anti-noise capabilities, referred to as Enhanced TICNN (ETICNN).ETICNN autonomously extracts optimal damage-sensitive features from the original vibration data. To validatethe superiority of the proposed ETICNN, experiments are conducted using the bleacher model from Qatar Universityas the subject. Comparative studies under identical experimental conditions involve TICNN, Deep ConvolutionalNeural Networks with wide first-layer kernels (WDCNN), and One-Dimensional ConvolutionalNeural Network (1DCNN). The experimental findings demonstrate that the ETICNN model achieves the highestaccuracy, approximately 99%, and exhibits robust classification abilities in both Phases I and II of the damagediagnosis experiments. Simultaneously, the ETICNN model demonstrates strong anti-noise capabilities, outperformingTICNN by 3% to 4% and surpassing other models in performance.

关键词： Bleacher vibration signal damage diagnosis convolutional neural network anti-noise ability

Four new phenolic glycosides from Baoyuan decoction

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2017年第2期7卷 173-178页

作者： Xiaoli Ma xiaoyu guo Mingbo Zhao Pengfei Tu Yong Jiang State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China

Four new phenolic glycosides,including two flavonoid glycosides(1 and 2) and two lignan glycosides(3 and 4),were isolated from the traditional Chinese medicine formula,Baoyuan *** structures were established by detailed analysis of the NMR and HR-ESI-MS spectroscopic data and their absolute configurations were determined by the experimental electronic circular dichroism data as well as chemical ***,the sources of the four new compounds were determined by the UPLC-Qtrap-MS method,which proved that 1 and 2 are originated from Glycyrrhiza uralensis,and 3 and4 are from Cinnamomum cassia.

关键词： Baoyuan decoction Traditional Chinese med icine formula Flavonoid glycosides Lignan glycosides Electronic circular dichroism UPLC–Qtrap-MS

Di-defects synergy boost electrocatalysis hydrogen evolution over two-dimensional heterojunctions

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第1期15卷 677-684页

作者： Yan Cui xiaoyu guo Jian Zhang Xing’ao Li Xinbao Zhu Wei Huang Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China New Energy Technology Engineering Lab of Jiangsu Province School of ScienceNanjing University of Posts&Telecommunications(NUPT)Nanjing 210023China Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced Materials(LAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts&Telecommunications(NUPT)Nanjing 210023China College of Chemical Engineering Nanjing Forestry UniversityNanjing 210037China Shaanxi Institute of Flexible Electronics(SIFE) Northwestern Polytechnical University(NPU)}127 West Youyi RoadXian 710072China

Electronic modulation on the inert basal plane of transition-metal dichalcogenides(TMDs)through vacancy defect excitation,although extremely challenging,is urgent for understanding the factors that impact the hydrogen evolution reaction(HER)catalytic ***,ultrathin WS2 nanosheets with precise quantitative single atomic S-vacancy on the inert basal plane were flexible prepared through hydrogen peroxide etching *** as-synthesized single atomic S-vacancy defect WS2(SVD-WS2)nanoflake with the activated basal plane exhibited an impressive overpotential of 137 mV at a current density of 10 mA·cm^(-2) and a Tafel slope of 53.9 mV dec^(-1).Furthermore,anchoring on the defect graphene matrix,the assembled two-dimensional(2D)stacking heterojunction exhibits further enhanced HER catalytic activity(an overpotential of 108 mV vs.10 mA·cm^(-2) and a Tafel slope of 48.3 mV·dec^(-1))and stability(〜10%decline after 9,000 cycles),which attributed to the electronic structure modulation from the synergetic interactions between SVD-WS_(2) and defect *** finding provides a smart defects introduce strategy to trigger high-efficiency hydrogen evolution over WS_(2) nanosheets and a general 2D heterojunctions fabricated inspiration based on strong interaction interface.

关键词： S-vacancies defect graphene hydrogen evolution reaction heterojunctions