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可编织、可穿戴的宽带聚合物超声换能器

Science China Materials 2024年第8期67卷 2653-2660页

作者：邹君逸郭星奕吴家琦徐冬梅许凯亮陈培宁他得安彭慧胜 State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Institute of Fiber Materials and DevicesLaboratory of Advanced MaterialsFudan UniversityShanghai 200438China Department of Biomedical Engineering Yiwu Research Institute and Shanghai Poda Medical Technology Co.Ltd.Fudan UniversityShanghai 200438China

新兴的物联网技术推动了可穿戴健康监测设备的快速发展.目前,医学超声技术在严重慢性疾病的长时间监测方面具有广阔的应用前景.然而,商用超声探头一般都是刚性的,需要手持,难以满足医疗可穿戴设备对柔性化、小型化和舒适性的要求.本文... 详细信息

新兴的物联网技术推动了可穿戴健康监测设备的快速发展.目前,医学超声技术在严重慢性疾病的长时间监测方面具有广阔的应用前景.然而,商用超声探头一般都是刚性的,需要手持,难以满足医疗可穿戴设备对柔性化、小型化和舒适性的要求.本文提出了一种可编织、可穿戴的聚合物超声换能器,该换能器由匹配层、背衬层和压电层组成.聚合物压电材料的带宽(93%)是压电陶瓷的7倍,并且可以承受超过10,000次的弯曲和扭曲变形.该传感器能监测颈动脉血液流速,心脏血液流速和心脏血管的血管厚度,并具有与商用探头相当的信噪比.它的宽带特性(3.68–10.08 MHz)使其能通过调整频率来监测不同的组织.可编织超声换能器可以制成纤维形式,并编织成透气织物,在不牺牲穿戴舒适性的情况下进行实时血管监测.

关键词：血液流速超声换能器可穿戴设备超声探头扭曲变形匹配层慢性疾病压电材料

Recent advances in alkaline hydrogen oxidation reaction

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Journal of Energy Chemistry 2022年第3期31卷 107-122,I0004页

作者： Lixin Su Dan Gong Yiming Jin dean Wu Wei Luo College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072HubeiChina Suzhou Institute of Wuhan University Suzhou 215123JiangsuChina

The development of highly efficient electrocatalysts toward hydrogen oxidation reaction(HOR)under alkaline media is essential for the commercialization of alkaline exchange membrane fuel cells(AEMFCs).However,the HOR kinetics in alkaline is two to three orders of magnitude slower than that in *** critically,fundamental understanding of the sluggish kinetics derived from the p H effect is still *** this review,the recent development of understanding HOR mechanism and rational design of advanced HOR electrocatalysts are ***,recent advances in the theories focusing on fundamental understandings of HOR under alkaline electrolyte are comprehensively ***,from the aspect of intermediates binding energy,optimizing hydrogen binding energy(HBE)and increasing hydroxyl binding energy(OHBE),the strategies for designing efficient alkaline HOR catalysts are *** last,perspectives for the future research on alkaline HOR are pointed out.

关键词： Hydrogen oxidation reaction Hydrogen evolution reaction Alkaline electrolyte AEMFC Binding energy

Interlayer-confined two-dimensional manganese oxide-carbon nanotube catalytic ozonation membrane for efficient water purification

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 731-744页

作者： dean Xu Tong Ding Yuqing Sun Shilong Li Wenheng Jing State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China

Catalytic ozonation technology has attracted copious attention in water purification owing to its favorable oxidative degradation of pollutants and mitigation of membrane fouling ***,its extensive industrial application has been restricted by the low ozone utilization and limited mass transfer of the short-lived radical *** space-confined catalysis has been theoretically proven to be a viable strategy for achieving high catalytic ***,a two-dimensional MnO_(2)-incorporated ceramic membrane with tunable interspacing,which was obtained via the intercalation of a carbon nanotube,was designed as a catalytic ozonation membrane reactor for degrading methylene *** from the abundant catalytic active sites on the surface of two-dimensional MnO_(2) as well as the ultralow mass transfer resistance of fluids due to the nanolayer confinement,an excellent mineralization effect,i.e.,1.2 mg O_(3)(aq)mg^(-1) TOC removal(a total organic carbon removal rate of 71.5%),was achieved within a hydraulic retention time of 0.045 s of pollutant ***,the effects of hydraulic retention time and interlayer spacing on methylene blue removal were ***,the mechanism of the catalytic ozonation employing catalytic ozonation membrane was proposed based on the contribution of the Mn(III/IV)redox pair to electron transfer to generate the reactive oxygen *** innovative twodimensional confinement catalytic ozonation membrane could act as a nanoreactor and separator to efficiently oxidize organic pollutants and enhance the control of membrane fouling during water purification.

关键词： catalytic membrane reactor catalytic ozonation nanoconfinement two-dimensional manganese oxide

Structural and functional roles of ether lipids

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Protein & Cell 2018年第2期9卷 196-206页

作者： John M. dean Irfan J. Lodhi Division of Endocrinology Metabolism and Lipid Research Department of Medicine Washington University School of Medicine Saint Louis MO 63110 USA

Ether lipids, such as plasmalogens, are peroxisome- derived glycerophospholipids in which the hydrocarbon chain at the sn-1 position of the glycerol backbone is attached by an ether bond, as opposed to an ester bond in the more common diacyl phospholipids. This seem- ingly simple biochemical change has profound structural and functional implications. Notably, the tendency of ether lipids to form non-lamellar inverted hexagonal structures in model membranes suggests that they have a role in facilitating membrane fusion processes. Ether lipids are also important for the organization and stability of lipid raft microdomains, cholesterol-rich membrane regions involved in cellular signaling. In addition to their structural roles, a subset of ether lipids are thought to function as endogenous antioxidants, and emerging studies suggest that they are involved in cell differentiation and signaling pathways. Here, we review the biology of ether lipids and their potential signifi- cance in human disorders, including neurological diseases, cancer, and metabolic disorders.

关键词： ether lipids plasmalogen phospholipid peroxisomes cancer metabolic disorders

Joint spectrogram segmentation and ridge-extraction method for separating multimodal guided waves in long bones

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Science China(Physics,Mechanics & Astronomy) 2013年第7期56卷 1317-1323页

作者： ZHANG ZhengGang XU KaiLiang TA dean WANG WeiQi Department of Electronic Engineering Fudan University

Ultrasonic guided waves (GWs) can be used to evaluate long bones effectively because of the ability to provide the information of the whole bone. In this study, a joint spectrogram segmentation and ridge-extraction (JSSRE) method was proposed to separate multiple modes in long bones. First, the Gabor time-frequency transform was applied to obtain the spectrogram of multimodal signals. Then, a multi-class image segmentation algorithm was used to find the corresponding region of each mode in the spectrogram, including an improved watershed transform and a region growing procedure. Finally, the ridges were extracted and the time domain signals representing individual modes were reconstructed from these ridges in each region. The validations of this method were discussed by simulated multimodal signals with different signal-to-noise ratios (SNR). The correlation coefficients between the original signals without noise and the reconstructed signals were calculated to analyze the results quantitatively. The results showed that the extracted ridges were in good agreement with generated theoretical dispersion curves, and the reconstructed signals were highly related to the original signals, even under the SNR=3 dB situation.

关键词： multimodal guided waves long bone spectrogram segmentation

Effect of selected signals of interest on ultrasonic backscattering measurement in cancellous bones

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Science China(Physics,Mechanics & Astronomy) 2013年第7期56卷 1310-1316页

作者： LIU ChengCheng HAN HaiJie TA dean WANG WeiQi Department of Electronic Engineering Fudan University

This study examined how the signals of interest （SOI） effect on the backscattering measurement numerically based on 3-D finite-difference time-domain （FDTD） method. High resolution microstructure mappings of bovine cancellous bones provided by micro-CT were used as the input geometry for simulations. Backscatter coefficient （BSC）, integrated backscatter coefficient （IBC） and apparent integrated backscatter （AIB） were calculated with changing the start （L1） and duration （L2） of the SOl. The results demonstrated that BSC and IBC decrease as L1 increases, and AIB decreases more rapidly as L1 increases. The backscattering parameters increase with fluctuations as a function of L2 when L2 is less than 6 mm. However, BSC and IBC change little as L2 continues to increase, while AIB slowly decreases as L2 continues to increase. The results showed how the selections of the SOI effect on the backscattering measurement. An explicit standard for SOl selection was proposed in this study and short L1 （about 1.5 mm） and appropriate L2 （6 mm-12 mm） were recommended for the calculations of backscattering parameters.

关键词： ultrasonic backscattering cancellous bone FDTD simulation signals of interest backscattering parameters

Detecting Android Malware Using Clone Detection

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Journal of Computer Science & Technology 2015年第5期30卷 942-956页

作者：陈健 Manar H. Alalfi Thomas R. dean 邹颖 Department of Electrical and Computer Engineering Queen's University Kingston KTL 3N6 Canada School of Computing Queen's University Kingston KTL 3N6 Canada

Android is currently one of the most popular smartphone operating systems. However, Android has the largest share of global mobile malware and significant public attention has been brought to the security issues of Android. In this paper, we investigate the use of a clone detector to identify known Android malware. We collect a set of Android applications known to contain malware and a set of benign applications. We extract the Java source code from the binary code of the applications and use NiCad, a near-miss clone detector, to find the classes of clones in a small subset of the malicious applications. We then use these clone classes as a signature to find similar source files in the rest of the malicious applications. The benign collection is used as a control group. In our evaluation, we successfully decompile more than 1 000 malicious apps in 19 malware families. Our results show that using a small portion of malicious applications as a training set can detect 95% of previously known malware with very low false positives and high accuracy at 96.88%. Our method can effectively and reliably pint）oint malicious applications that belon~ to certain ma｜w^ro ***~

关键词： Android malware clone detection

《旅游者:休闲阶层的新理论》与现代性的民族志者:dean MacCannell访谈录

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旅游学刊 2018年第12期33卷 15-25页

作者： dean MacCannell 赵红梅美国加州大学戴维斯分校加利福尼亚戴维斯95616 云南师范大学旅游与地理科学学院云南昆明650500

《旅游者:休闲阶层的新理论》(以下简称《旅游者》)是对旅游研究影响深远的一部社会学著作。自1976年初版以来,该书吸引了一批又一批评论者、运用者与反思者,其中的"舞台真实性"理论已成为"真实性"论域的一个元理论。《旅游者》的著者—... 详细信息

《旅游者:休闲阶层的新理论》(以下简称《旅游者》)是对旅游研究影响深远的一部社会学著作。自1976年初版以来,该书吸引了一批又一批评论者、运用者与反思者,其中的"舞台真实性"理论已成为"真实性"论域的一个元理论。《旅游者》的著者——dean MacCannell教授是一位阅历丰富、见解深邃的社会学家,他的研究路径是通过旅游者反观自身社会,反观无处不在的现代性。访谈围绕dean MacCannell教授的教育背景、智识渊源与该书的结构、理论内容来展开,以获得对作者与经典文本的双重理解。

关键词： “舞台真实性” 分化社会结构现代性《旅游者:休闲阶层的新理论》

设计自主实验环节培养科学探究素养——以曲线运动为例

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物理实验 2024年第4期44卷 54-57,63页

作者：孙青刘长灿李德安华南师范大学物理与电信工程学院广东广州510006 番禺中学广东广州511483

为落实课程标准培养学生科学探究素养的要求,克服当前中学生按部就班刻板实验的现象,提出了基于科学探究的学生自主实验设计方案.依据科学探究的问题、证据、解释、交流四要素提出了学生自主实验的4个步骤:创设情境,激发猜想假设;制定方... 详细信息

为落实课程标准培养学生科学探究素养的要求,克服当前中学生按部就班刻板实验的现象,提出了基于科学探究的学生自主实验设计方案.依据科学探究的问题、证据、解释、交流四要素提出了学生自主实验的4个步骤:创设情境,激发猜想假设;制定方案,增强实践本领;处理数据,培养解释能力;评估反思,发展交流素养.并以曲线运动为例对以上4个步骤进行了阐述.

关键词：自主实验科学探究曲线运动