检索结果-南通市图书馆

频率选择性衰落信道下的星形QAM信号载波盲估计

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

系统仿真学报 2008年第21期20卷 5917-5919页

作者：郑文秀赵国庆罗明西安电子科技大学电子工程学院陕西西安710071

针对通信对抗和QAM信号解调的实际应用,建立多径和频率选择性衰落信道下的QAM信号模型,提出一种利用特定高阶循环累积量估计星形QAM载波的方法。通过理论分析可证明在平稳和非平稳高斯噪声背景和衰落信道特性下,星形8、16QAM信号的特定... 详细信息

针对通信对抗和QAM信号解调的实际应用,建立多径和频率选择性衰落信道下的QAM信号模型,提出一种利用特定高阶循环累积量估计星形QAM载波的方法。通过理论分析可证明在平稳和非平稳高斯噪声背景和衰落信道特性下,星形8、16QAM信号的特定四阶循环累积量仅在载波位置处存在,因此可通过检测此循环频率实现载波的估计。该算法可推广到更高阶星形QAM信号。仿真实验验证了该算法的有效性。

关键词：通信对抗 QAM信号参数估计循环累积量

Cortico-striatal gamma oscillations are modulated by dopamine D3 receptors in dyskinetic rats

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 1164-1177页

作者： Pengfei Wang Yuewei Bi Min Li Jiazhi Chen Zhuyong Wang Huantao Wen ming Zhou Minjie luo Wangming Zhang Neurosurgery Center Department of Pediatric NeurosurgeryGuangdong Provincial Key Laboratory on Brain Function Repair and RegenerationZhujiang HospitalSouthern Medical UniversityGuangzhouGuangdong ProvinceChina

Long-term levodopa administration can lead to the development of levodopa-induced *** oscillations are a widely recognized hallmark of abnormal neural electrical activity in levodopa-induced ***,studies have reported increased oscillation power in cases of levodopa-induced ***,little is known about how the other electrophysiological parameters of gamma oscillations are altered in levodopa-induced ***,the role of the dopamine D3 receptor,which is implicated in levodopa-induced dyskinesia,in movement disorder-related changes in neural oscillations is *** found that the cortico-striatal functional connectivity of beta oscillations was enhanced in a model of Parkinson’s ***,levodopa application enhanced cortical gamma oscillations in cortico-striatal projections and cortical gamma aperiodic components,as well as bidirectional primary motor cortex(M1)↔dorsolateral striatum gamma *** of PD128907(a selective dopamine D3 receptor agonist)induced dyskinesia and excessive gamma oscillations with a bidirectional M1↔dorsolateral striatum ***,administration of PG01037(a selective dopamine D3 receptor antagonist)attenuated dyskinesia,suppressed gamma oscillations and cortical gamma aperiodic components,and decreased gamma causality in the M1→dorsolateral striatum *** findings suggest that the dopamine D3 receptor plays a role in dyskinesia-related oscillatory activity,and that it has potential as a therapeutic target for levodopa-induced dyskinesia.

关键词： aperiodic components dopamine D3 receptor dorsolateral striatum functional connectivity gamma oscillations levodopa-induced-dyskinesia local field potentials neuromodulation Parkinson’s disease primary motor cortex

Modeling the damage caused by cortical spreading depression during cerebral ischemia

在线全文

学校读者我要写书评

暂无评论

Modeling the damage caused by cortical spreading depression ...

A versatile synthetic strategy towards rare earth based metal-organic frameworks

中国神经科学学会第四次会员代表大会暨第八届全国学术会议

作者： Bing LI~(**) Shang-Bin CHEN~(**) qing-ming luo Peng-Cheng LI~* Britton Chance Center of Biomedical Photonics Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China

＜正＞Objective Cerebral ischemia is an important kind of *** cerebral ischemia,there is often such a phenomenon of cortical spreading depression（CSD）,accompanying with the damage of cortical *** has been considered to be involved in migraine,epilepsy and the extension of the infarct area in *** introduced a mathematical model here to study the damage caused by CSD during the cerebral *** We incorporated previous models proposed by others and obtained a reasonable set of parameters by calculating under certain *** penumbra which surrounded the infarct center was established by setting a linear cerebral blood flow *** was evoked from the infarct area,where the blood flow was clamped to ***（1） CSD did no evident harm the tissue with normal blood flow supply,but in the penumbra,there was infarction coming into *** were in good consistency with the experimental results.（2） Cells with blood supply less than 36%would die in our ***,cells with blood supply less than 12%would die of necrosis,while blood supply between 12%and 36%would die of apoptosis.（3） Necrosis happened earlier than *** ended in about 10 minutes,and apoptosis ended in about 6 *** there was no close joint between necrosis and apoptosis in *** did not follow necrosis immediately after the ending of necrosis.（4） Different cells had diverse responses to CSD because of the different degrees of *** supply was close related to energy possessed by *** less the blood supply was,the more difficult for the cell to recover from CSD.（5） By blocking the CSD in the ischemic tissue,we found that the infarct area became *** needed a longer time to finish,however,the necrosis area was as large as that when CSD was in *** decrease of the infarct area was mainly due to the decrease of the region of *** CSD could compromise the ischemic tissue and cause the cell

关键词： cerebral ischemia cortical spreading depression mathematical model blood supply necrosis apoptosis

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Quan Shi Yun-Hao Xu ming-Hui Chen Peng Zhao Wen-Bo Deng Ji Xiong Kai Guo Ya-qing Feng Bao Zhang School of Chemical Engineering and Technology Tianjin University Tianjin Collaborative Innovation Center of Chemical Science and Engineering Guangdong Laboratory Chemistry & Fine Chemical Industry Jieyang Center

Rare earth metal-organic frameworks (RE-MOFs) have drawn wide attention owing to diverse network structures and various application ***,due to the unpredictable formation of the nodes,it is still challenging to design novel RE-MOFs.A novel versatile strategy was developed employing a RE-acetate complex (RE2(CH3COO)6·4H2O) as a precursor to construct RE-MOFs.2D RE-MOFs (RE-DBP) and 3D RE-MOFs (RE-TCPP) could be obtained by using dicarboxylic porphyrin ligands H2DBP and tetracarboxylic porphyrin ligands H2TCPP,*** RE-MOFs were further synthesized to verify the universality of the *** crystalline RE-MOFs could also be prepared at room temperature via the developed strategy,which could significantly promote large-scale preparation and practical application of *** proof of the concept,the performance of porphyrin-based RE-MOFs was investigated in the photocatalytic cycloaddition of CO2with *** the RE-DBP(Co) MOFs,Tb-DBP(Co) exhibited the best photocatalytic performance,which was also greater than that of the corresponding 3D MOF Tb-TCPP(Co) due to the optimal 2D structure and thus the accelerated photogenerated charge separation and transfer *** work not only provides a novel versatile strategy to design and develop RE-MOFs,but also proposes a promising approach for the potential bulk production of RE-MOFs at room temperature.

关键词：

Author Correction: Skull optical clearing window for in vivo imaging of the mouse cortex at synaptic resolution

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2018年第1期7卷 986-986页

作者： Yan-Jie Zhao Ting-Ting Yu Chao Zhang Zhao Li qing-ming luo Tong-Hui Xu Dan Zhu Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and TechnologyWuhanHubei 430074China MoE Key Laboratory for Biomedical Photonics Collaborative Innovation Center for Biomedical EngineeringSchool of Engineering SciencesHuazhong University of Science and TechnologyWuhanHubei 430074China

Correction to:Light:Science&Applications(2018)7,17153;https://***/10.1038/lsa.2017.153;Article published online,23 February *** the version of this article originally published,in the“Materials and methods”section under subheading“Reagents”,there are errors about the information of *** the original and corrected versions are shown below.

关键词： online heading resolution

MODELING ON DYNAMIC PROCESS OF MEMBRANE FOULING DURING FINITE CROSSFLOW ULTRAFILTRATION IN CHARGED SYSTEM

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 Hydrodynamics 2006年第2期18卷 206-210页

作者： luo ming-Liang PU Chun-sheng ZHAO Jian-qing College of Petroleum Engineering China University of Petroleum （East China） Dongying 257061 China College of Materials Science and Engineering South China University of Technology Guangzhou 510640 China

Flux decline during finite crossflow Ultrafiltration（UF） in charged system was investigated by perceiving membrane fouling as a dynamic process from non-equilibrium to equilibrium. Under the influence of the boundary condition at the initial section and cross flow, the equilibrium is first reached at the initial section of the crossflow filter and the front of the equilibrium region progresses with time toward the end of the filter. A mathematic model was developed to describe this dynamic process of membrane fouling in a charged system. With the model, the time-dependent flux and the time required to reach the steady state in a crossflow filtration can be easily determined. The fouling process under different conditions is simulated as illustrated with a demonstration of the newly developed model. The resulls of simulation show that there are jumps in the local flux at the front of the equilibrium region and the electrokinetic properties of charged UF system have a very substantial influence on the separation performance of membrane.

关键词： fouling dynamics flux decline,Ultrafiltration(UF) charged system modeling

Morphology Study for GeV Emission of Nearby Supernova Remnant G332.5-5.6

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第4期24卷 134-140页

作者： ming-Hong luo qing-Wen Tang Xiu-Rong Mo Department of Physics School of Physics and Materials ScienceNanchang UniversityNanchang 330031China

A spatial template is important to study nearby supernova remnants(SNRs).For SNR G332.5-5.6,we report a Gaussian disk with a radius of about 1°.06 to be a potential good spatial model in the γ-ray *** this new Gaussian disk,its GeV lightcurve shows a significant variability of about seven *** γ-ray observations of this SNR could be explained well either by a leptonic model or a hadronic model,in which a flat spectrum for the ejected electrons/protons is required.

关键词： ISM:supernova remnants gamma rays:ISM

Multi-scale traffic vehicle detection based on faster ReCNN with NAS optimization and feature enrichment

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第4期17卷 1542-1554页

作者： Ji-qing luo Hu-sheng Fang Fa-ming Shao Yue Zhong Xia Hua Department of Mechanical Engineering College of Field EngineeringArmy Engineering University of PLANanjing210007China

It well known that vehicle detection is an important component of the field of object ***,the environment of vehicle detection is particularly sophisticated in practical *** is comparatively difficult to detect vehicles of various scales in traffic scene images,because the vehicles partially obscured by green belts,roadblocks or other vehicles,as well as influence of some low illumination *** this paper,we present a model based on Faster ReCNN with NAS optimization and feature enrichment to realize the effective detection of multi-scale vehicle targets in traffic ***,we proposed a Retinex-based image adaptive correction algorithm(RIAC)to enhance the traffic images in the dataset to reduce the influence of shadow and illumination,and improve the image ***,in order to improve the feature expression of the backbone network,we conducted Neural Architecture Search(NAS)on the backbone network used for feature extraction of Faster ReCNN to generate the optimal cross-layer connection to extract multi-layer features more ***,we used the object Feature Enrichment that combines the multi-layer feature information and the context information of the last layer after cross-layer connection to enrich the information of vehicle targets,and improve the robustness of the model for challenging targets such as small scale and severe *** the implementation of the model,K-means clustering algorithm was used to select the suitable anchor size for our dataset to improve the convergence speed of the *** model has been trained and tested on the UN-DETRAC dataset,and the obtained results indicate that our method has art-of-state detection performance.

关键词： Neural architecture search Feature enrichment Faster R-CNN Retinex-based image adaptive correction algorithm K-means UN-DETRAC

A Bipartition Model with Single-Scattering Approximation for the Calculations of Reflection of Energetic Ions from Surfaces

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1997年第1期14卷 44-46页

作者： HOU qing TENG Li-jian luo Zheng-ming Institute of Nuclear Science and Technology Sichuan Union UniversityChengdu 610064

A bipartition model for ion transport in solids has been *** the earlier bipartition model,a single-scattering approximation has been adopted and angular correlation of energy transfer has been partly taken into *** the present bipartition model,the reflection coefficients and energy spectrum of reflected ions have been *** results show that the present bipartition model gives better descriptions of reflection although it is simpler in calculation than the earlier bipartition model.

关键词： partition Approximation simpler