检索结果-南通市图书馆

In vivo volumetric monitoring of revascularization of traumatized skin using extended depth-of-field photoacoustic microscopy

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

Frontiers of Optoelectronics 2020年第4期13卷 307-317页

作者： zhongwen cheng Haigang MA Zhiyang WANG Sihua YANG MOE Key Laboratory of Laser Life Science&Institute of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China Guangdong Provincial Key Laboratory of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China

Faster and better wound healing is a critical medical *** the repair process of wounds is closely related to revascularization,accurate early assessment and postoperative monitoring are very important for establishing an optimal treatment ***,we present an extended depth-of-field photoacoustic microscopy system(E-DOF-PAM)that can achieve a constant spatial resolution and relatively uniform excitation efficiency over a long axial *** superior performance of the system was verified by phantom and in vivo ***,the system was applied to the imaging of normal and trauma sites of volunteers,and the experimental results accurately revealed the morphological differences between the normal and traumatized skin of the epidermis and *** results demonstrated that the E-DOF-PAM is a powerful tool for observing and understanding the pathophysiology of cutaneous wound healing.

关键词： photoacoustic microscopy(PAM) extended depth-of-field traumatized skin

3D depth-coded photoacoustic microscopy with a large field of view for human skin imaging

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2018年第8期16卷 58-61页

作者： zhongwen cheng Haigang Ma Zhiyang Wang Sihua Yang MOE Key Laboratory of Laser Life Science ＆ Institute of Laser Life Science South China Normal University Guangzhou 510631 China College of Biophotonics South China Normal University Guangzhou 510631 China

Photoacoustic （PA） microscopy comes with high potential for human skin imaging, since it allows noninvasively high-resolution imaging of the natural hemoglobin at depths of several millimeters. Here, we developed a PA microscopy to achieve high-resolution, high-contrast, and large field of view imaging of skin. A three-dimensional （3D） depth-coding technology was used to encode the depth information in PA images, which is very intuitive for identifying the depth of blood vessels in a two-dimensional image, and the vascular structure can be analyzed at different depths. Imaging results demonstrate that the 3D depth-coded PA microscopy should be translated from the bench to the bedside.

关键词： PA depth-coded photoacoustic microscopy with a large field of view for human skin imaging

在线全文

学校读者我要写书评

暂无评论

混合k空间经颅聚焦超声相位校正

应用声学 2024年第5期43卷 1093-1101页

作者：闵尊清何佳儒吴灿文程中文曾吕明陈燕纪轩荣省部共建精密电子制造技术与装备国家重点实验室广东工业大学机电工程学院广州510006

经颅聚焦超声是一种非侵入性治疗方式,为脑功能性疾病的治疗提供了一种新思路,其常见的应用有血脑屏障打开、脑部肿瘤消融、神经调控等。由于颅骨的异质性,超声在传播过程中会产生畸变,需要一定的相位校正实现超声的聚焦。利用时间反转... 详细信息

经颅聚焦超声是一种非侵入性治疗方式,为脑功能性疾病的治疗提供了一种新思路,其常见的应用有血脑屏障打开、脑部肿瘤消融、神经调控等。由于颅骨的异质性,超声在传播过程中会产生畸变,需要一定的相位校正实现超声的聚焦。利用时间反转结合k空间伪谱可以实现对于非均匀的颅骨进行相位校正。然而,在相控聚焦过程中,同时提高相位校正的精度和减少计算的时间是一个矛盾的关系。该文提出伪谱法和角谱法相结合的混合k空间方法在较短时间内优化相位校正,k空间伪谱模拟非均匀的颅骨部分,角谱法模拟均匀的脑组织部分,并对经兔颅骨后的声场进行仿真与测试。结果表明,混合k空间和k空间相位校正方法得到焦点处的声压差和位置差较小,分别为3%和6%。在模型网格大小为310×310×300条件下,混合k空间相位校正方法的相位计算时间(14.98 min)与k空间方法(91.73 min)计算时间相比大幅降低,在脑超声治疗临床方面具有良好的应用前景。

关键词：聚焦超声相位校正角谱法 k空间

Polarization microwave-induced thermoacoustic imaging for quantitative characterization of deep biological tissue microstructures

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

Photonics Research 2022年第5期10卷 1297-1306页

作者： YUJING LI SHANXIANG ZHANG LINGHUA WU zhongwen cheng ZHENHUI ZHANG HAOHAO WANG SHUXIANG ZHAO MINGYANG REN SIHUA YANG DA XING HUAN QIN MOE Key Laboratory of Laser Life Science&Institute of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China Guangdong Provincial Key Laboratory of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China Guangzhou Key Laboratory of Spectral Analysis and Functional Probes College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China

Polarization optical imaging can be used to characterize anisotropy in biological tissue microstructures and has been demonstrated to be a powerful tool for clinical diagnosis. However, the approach is limited by an inability to image targets deeper than ~1 mm due to strong optical scattering in biological tissues. As such, we propose a novel polarization microwave-induced thermoacoustic imaging(P-MTAI) technique to noninvasively detect variations in deep tissue by exploiting the thermoacoustic signals induced by four pulsed microwaves of varying polarization orientations. The proposed P-MTAI method overcomes the penetration limits of conventional polarization optical imaging and provides submillimeter resolution over depths of several centimeters. As part of the paper, the structural characteristics of tissues were quantified using a new parameter, the degree of microwave absorption anisotropy. P-MTAI was also applied to the noninvasive detection of morphological changes in cardiomyocytes as they transitioned from ordered to disordered states, providing a potential indication of myocardial infarction.

关键词： polarization millimeter scattering

Rapid Phase Ambiguity Elimination Methods for DOA Estimator via Hybrid Massive MIMO Receive Array

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2024年第1期33卷 175-184页

作者： Xichao ZHAN zhongwen SUN Feng SHU Yiwen CHEN Xin cheng Yuanyuan WU Qi ZHANG Yifan LI Peng ZHANG School of Information and Communication Engineering Hainan University School of Electronic and Optical Engineering Nanjing University of Science and Technology

For a sub-connected hybrid multiple-input multiple-output(MIMO) receiver with K subarrays and N antennas, there exists a challenging problem of how to rapidly remove phase ambiguity in only single time-slot. A direction of arrival(DOA) estimator of maximizing received power(Max-RP) is proposed to find the maximum value of K-subarray output powers, where each subarray is in charge of one sector, and the center angle of the sector corresponding to the maximum output is the estimated true DOA. To make an enhancement on precision, Max-RP plus quadratic interpolation(Max-RP-QI) method is designed. In the proposed Max-RP-QI, a quadratic interpolation scheme is adopted to interpolate the three DOA values corresponding to the largest three receive powers of *** achieve the Cramer Rao lower bound, a Root-MUSIC plus Max-RP-QI scheme is developed. Simulation results show that the proposed three methods eliminate the phase ambiguity during one time-slot and also show low computational complexities. The proposed Root-MUSIC plus Max-RP-QI scheme can reach the Cramer Rao lower bound,and the proposed Max-RP and Max-RP-QI are still some performance losses 2–4 d B compared to the Cramer Rao lower bound.

关键词： Phased arrays Interpolation Wireless sensor networks Direction-of-arrival estimation Simulation Receiving antennas Massive MIMO

Beamforming Design for IRS-and-UAV-Aided Two-Way Amplify-and-Forward Relay Networks in Maritime IoT

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Communications 2024年第8期21卷 45-61页

作者： Wang Xuehui Shu Feng Wu Yuanyuan Shi Weiping Yan Shihao Zhao Yifan cheng Qiankun Sun zhongwen Wang Jiangzhou School of Information and Communication Engineering Hainan UniversityHaikou 570228China Collaborative Innovation Center of Information Technology Hainan UniversityHaikou 570228China School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China School of Network and Communication Nanjing Vocational College of Information TechnologyNanjing 210023China School of Science and Security Research Institute Edith Cowan UniversityPerthWA 6027Australia School of Engineering University of KentCanterbury CT27NTU.K

In this paper,an intelligent reflecting surface(IRS)-and-unmanned aerial vehicle(UAV)-assisted two-way amplify-and-forward(AF)relay network in maritime Internet of Things(IoT)is proposed,where ship1(S1)and ship2(S2)can be viewed as data collecting *** enhance the message exchange rate between S1 and S2,a problem of maximizing minimum rate is cast,where the variables,namely AF relay beamforming matrix and IRS phase shifts of two time slots,need to be *** achieve a maximum rate,a low-complexity alternately iterative(AI)scheme based on zero forcing and successive convex approximation(LC-ZF-SCA)algorithm is *** obtain a significant rate enhancement,a high-performance AI method based on one step,semidefinite programming and penalty SCA(ONSSDP-PSCA)is *** results show that by the proposed LC-ZF-SCA and ONS-SDP-PSCA methods,the rate of the IRS-and-UAV-assisted AF relay network surpass those of with random phase and only AF relay ***,ONS-SDP-PSCA perform better than LC-ZF-SCA in aspect of rate.

关键词： beamforming maritime Internet of Things phase shift rate performance two-way amplify-and-forward relay unmanned aerial vehicle

Distinct Effects of Three Tea Varieties Made Green Teas on Improving Diabetic Dyslipidemia Induced by High-Fat Diet in C57BL/6J Mice

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年

作者： Wei Gu Zhutong Wang Guohuo Wu Huimin Guo Huijun cheng Cong Li Linbo Chen Daxiang Li zhongwen Xie State Key Laboratory of Tea Plant Biology and Utilization， School of Tea and Food Sciences & Technology， Anhui Agricultural University Center for Biotechnology， Anhui Agricultural University College of Life Sciences， Anhui Agricultural University Tea Research Institute， Yunnan Academy of Agricultural Sciences

Currently， cultivated tea plants are classified into three varieties， namely， C. sinensis var. sinensis， C. sinensis var. assamica， and C. sinensis var. kucha. Three tea varieties made green teas (TVGTs) are widely consumed worldwide. However， a comparative investigation of the beneficial effects， mechanism， and characteristic compounds of TVGTs has not been reported. Here， three representative tea plant varieties， namely， C. sinensis var. sinensis cv. Fuding (FD)， C. sinensis var. assamica cv. Yunkang 10 (YK)， and C. sinensis var. kucha (KC)， planted in the same garden， were used to make green teas utilizing the same standard procedure. Our findings show that the TVGTs effectively improved hyperglycemia， obesity， dyslipidemia， fatty liver， and mesenteric artery (MA) hypercontractility in mice with diabetes and obesity induced by a high-fat diet (HFD) after 11- and 22-week interventions， with YK being the most effective at 22 weeks. Liver lipidomics indicated that the TVGTs restored the glycerophospholipid and sphingolipid balance and reduced triglycerides， with YK demonstrating superior effects. The TVGTs， particularly YK， suppressed triglyceride synthesis through the ARV1-FXR-SHP-SREBP-1c pathway. A chemical profile analysis revealed that YK green tea had enriched active compounds， including caffeine， quinic acid， L-theanine， gallic acid， and catechins， compared with FD and KC green teas， which may contribute to ameliorating diabetic dyslipidemia via synergistic action. As a representative tea variety of C. sinensis var. assamica， YK green tea was found to be superior to the other two green teas in preventing and treating diabetic dyslipidemia， especially with long-term consumption. These data provide important information for tea plant breeders and tea consumers.

关键词：

基于SolidWorks的爬斗提升机爬斗截面优化设计

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

矿山机械 2014年第5期42卷 59-63页

作者：程仲文林小军兰州工业学院机电工程学院甘肃兰州730050

针对在爬斗提升机传统设计中,爬斗截面面积较小,设备整体宽度较宽的情况,提出了利用SolidWorks对斗容进行优化设计,在满足斗容的前提下,使料斗长度最短。结果表明,可有效缩短料斗长度,使整机宽度相应变窄,整机质量减轻,设备成本降低。

关键词：爬斗提升机截面面积体积优化爬斗长度

基于时序分析与模糊聚类的铣削刀具磨损状态识别

在线全文

学校读者我要写书评

暂无评论

机械强度 2007年第4期29卷 525-531页

作者：徐创文陈花玲程仲文李宝栋西安交通大学机械工程学院西安710049 兰州工业高等专科学校机械工程系兰州730050

对XKA714数控铣床采集的刀具运行状态振动信号进行计算、检验、分析样本自相关函数和样本偏相关函数的截尾性、拖尾性和周期性以及模型参数估计等时间序列相关分析,可判断动态数据序列适于AR(p)(autoregression)模型。以阶数p取12的模... 详细信息

对XKA714数控铣床采集的刀具运行状态振动信号进行计算、检验、分析样本自相关函数和样本偏相关函数的截尾性、拖尾性和周期性以及模型参数估计等时间序列相关分析,可判断动态数据序列适于AR(p)(autoregression)模型。以阶数p取12的模型参数作为特征向量提取,并采用模糊聚类分析方法确定刀具运行状态特征向量样本的亲疏关系,实现对铣削刀具的初期磨损阶段、正常磨损阶段和剧烈磨损阶段运行状态的识别。研究结果表明,基于时间序列分析与模糊聚类分析相结合的识别方法可以用于刀具磨损运行状态识别。

关键词：时间序列分析模糊聚类分析刀具磨损识别