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Ti_(3)C_(2)T_(x) MXene in-situ transformed Li_(2)TiO_(3) interface layer enabling 4.5 V-LiCoO_(2)/sulfide all-solid-state lithium batteries with superior rate capability and cyclability

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Chinese Chemical Letters 2024年第6期35卷 195-200页

作者： Yaping Wang Pengcheng Yuan Zeyuan Xu Xiong-Xiong liu shengfa Feng Mufan Cao Chen Cao Xiaoqiang Wang Long Pan Zheng-Ming Sun Key Laboratory of Advanced Metallic Materials of Jiangsu Province School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China CALB Technology Co. Ltd.Changzhou 213200China

All-solid-state lithium batteries(ASSLBs)based on sulfide electrolytes promise next-generation energy storage with high energy density and safety.However,the sulfide electrolytes suffer from phase instability and sluggish interfacial charge transport when pairing with layered oxide cathodes at high voltages.Herein,a simple and efficient strategy is proposed using two-dimensional Ti_(3)C_(2)T_(x)MXene as starting material to in-situ construct a 15 nm Li_(2)TiO_(3) layer on a typical oxide cathode,LiCoO_(2).The in-situ transformation of Ti_(3)C_(2)T_(x)into Li_(2)TiO_(3) layer occurs at a low temperature of 500℃,avoiding the phase deterioration of LiCoO_(2).The thin Li_(2)TiO_(3) layer is Li^(+)conducting and electrochemically stable,thereby preventing the interfacial decomposition of sulfide electrolytes induced by LiCoO_(2) at high voltages and facilitating Li+transport at the interface.Moreover,Li_(2)TiO_(3) can stabilize the layer structure of LiCoO_(2) at high voltages.Consequently,the sulfide-based ASSLB using LiCoO_(2)@Li_(2)TiO_(3) cathode can operate stably at a high voltage of up to 4.5 V(vs.Li+/Li),delivering an outstanding initial specific discharge capacity of 138.8 m Ah/g with a high capacity retention of 86.2% after 100 cycles at 0.2 C.The in-situ transformation strategy may also apply to other MXenes,offering a general approach for constructing other advanced lithiated coatings for oxide cathodes.

关键词： Solid sulfide electrolyte Oxide cathode MXene In-situ transformation Li_(2)TiO_(3)interfacial layer

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基于秘密分享的无线传感器网络多维数据安全聚合方案

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传感技术学报 2024年第4期37卷 709-715页

作者：张勇张生发刘登志江苏海洋大学计算机工程学院江苏连云港222005

无线传感器网络中的安全数据聚合方案旨在保护数据隐私、降低系统能耗,从而延长网络的生命周期。针对目前多维无线传感器网络中数据传输安全性不高、数据传输中的能量消耗过大等问题,提出一种基于阈值可变秘密分享的多维数据聚合方案(TC... 详细信息

无线传感器网络中的安全数据聚合方案旨在保护数据隐私、降低系统能耗,从而延长网络的生命周期。针对目前多维无线传感器网络中数据传输安全性不高、数据传输中的能量消耗过大等问题,提出一种基于阈值可变秘密分享的多维数据聚合方案(TCSSMDA)。首先,在本方案中,网络簇头的选择主要是依据网络节点的剩余能量以及其与基站的距离。同时,为了降低多维数据传输的能量消耗,使用预设值对多维传感器发送数据机制进行优化。最后,为了保证传感器的数据安全,使用设计了一种轻量级、高效通信的信息加密方式。安全性分析与模拟结果表明,所提出的方案在降低数据包大小、节点通信成本以及提升网络数据安全性和生存时间方面都表现出了较好的性能。

关键词：无线传感器网络数据聚合簇头选择秘密分享数据安全

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Major and trace element geochemistry of the mid-Bay of Bengal surface sediments: implications for provenance

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Acta Oceanologica Sinica 2017年第3期36卷 82-90页

作者： LI Jingrui liu shengfa FENG Xiuli SUN Xingquan SHI Xuefa College of Marine Geosciences Ocean University of China Key Laboratory of Marine Sedimentology and Environmental Geology The First Institute of OceanographyState Oceanic Administration Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology

The major and trace elements in 110 surface sediment samples collected from the middle of the Bay of Bengal（mid-Bay of Bengal） are analyzed to investigate provenance. Si levels are highest, followed by Al, and the distributions of these two elements are identical. The average CIA＊（chemical index of alteration） value is 72.07,indicating that the degree of weathering of the sediments in the study area is intermediate between those of sediments of the Himalayan and Indian rivers. Factor analyses and discrimination function analyses imply that the two main provenances are the Himalayan and the Indian continent. The inverse model calculation of the Tinormalized element ratios of the Bay of Bengal sediments indicate an estimated average contribution of 83.5%and 16.5% from the Himalayan and peninsular Indian rivers to the study area, respectively. The Himalayan source contributes more sediment to the eastern part of the study area, whereas the western part receives more sediment from the Indian Peninsula than did the eastern part. The primary mechanisms for deposition of sediments in the study area are the transport of Himalayan matter by turbidity currents and river-diluted water and the transport of Indian matter to the study area by a surface circulation in the Bay of Bengal, particularly the East India Coastal Current.

关键词： major and trace element Bay of Bengal provenance quantification factor analyses

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Distribution of major and trace elements in surface sediments of Hangzhou Bay in China

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Acta Oceanologica Sinica 2012年第4期31卷 89-100页

作者： liu shengfa liu Yanguang YANG Gang QIAO Shuqing LI Chaoxin ZHU Zhiwei SHI Xuefa First Institute of Oceanography State Oceanic AdministrationQingdao 266061China Key Laboratory of Marine Sedimentology and Environmental Geology State OceanicAdministrationQingdao 266061China

The Inductively Coupled Plasma Optical Emission Spectrometer was used to analyze sediment samples collected from the Hangzhou Bay to determine major and trace elemental concentrations. Based on these concentrations, the study area can be classified into three geochemical provinces. Province I covers the northern Hangzhou Bay area and contains high concentrations of A120~, Fe203, MgO, Na20, K20, MnO, Cr, Cu, Ni, Pb, V, Co and Zn. Province III is located in the western Hangzhou Bay, near the Qiantang River mouth, and contains high concentrations of SiO~, Na20, P205~ TiO2, Cr, Sr, Zr. Province II is located in the middle and eastern Hangzhou Bay, with the medium concentrations of major and trace elements. The results also demonstrate that the grain size is the dominating factor controlling the spatial variations of elemental concentrations, and the Changjiang River （Yangtze River） and Qiantang River sediments play an important role in the distribution of these elements. Anthropogenic impact on heavy metal concentrations （especially Cr, Sr and Zr） can be detected in the surface sediments near the Qiantang River mouth.

关键词： Hangzhou Bay Changjiang River sediments major and trace elements grain size,heavy metals

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Environmental record from the mud area on the inner continental shelf of the East China Sea since the mid-Holocene

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Acta Oceanologica Sinica 2011年第4期30卷 43-52页

作者： liu shengfa SHI Xuefa liu Yanguang WU Yonghua YANG Gang First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Key Laboratory of Marine Sedimentology and Environmental Geology State OceanicAdministration Qingdao 266061 China

Paleoclimate record was revealed in Core MZ01 covering the mid-Holocene in age,located in the mud area of the inner continental shelf of the East China Sea. The ancient environment featured low-energy shallow sea shelf deposition formed mainly by coastal currents. The results show that temporal variation in geochemistry corresponds with the climate changes inferred from historical record. Relatively low MgO/Al 2 O 3,CaO/K 2 O and high Al 2 O 3 /Na 2 O,K 2 O/Na 2 O,MnO/CaO values reflected a warm and humid climate in general,and vice versa. Therefore,these chemical indices could be applied to identify the variation of palaeoclimate in eastern China. The authors reconstructed the history of mid-Holocene climatic variation of the inner continental shelf of the East China Sea. From 8 300 a BP to 4 200 a BP,the climate was moderately warm and humid. From 4 200 a BP to 2 000 a BP,the climate turned cool and dry,and the regional climate frequently fluctuated in alternation of cool-dry periods（3 700 a BP,2 850 a BP and 2 400 a BP） and warm-wet periods（3 250 a BP and 2 650 a BP） . After 2 000 a BP,the climate of the study area gradually turned warm again,while the Little Ice Age,a cold event centered at around 250 a BP was indicated by those geochemical indices as mentioned above.

关键词： Holocene East China Sea mud area major element palaeoclimate East Asia monsoon

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Clay mineral composition and their sources for the fluvial sediments of Taiwan Residents rivers

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Chinese Science Bulletin 2012年第6期57卷 673-681页

作者： LI ChuanShun SHI XueFa KAO ShuhJi CHEN MinTe liu YanGuang FANG XiSheng LUE HuaHua ZOU JianJun liu shengfa QIAO ShuQing First Institute of Oceanography State Oceanic AdministrationQingdao 266061China Research Center for Environmental Changes Academia SinicaTaipei 11529China Institute of Applied Geosciences Taiwan Ocean UniversityKeelung 20224China

Located at the collision boundary between the Philippine Sea Plate and the Eurasian Continental Plate,the island of Taiwan is generally recognized as an important example in the MARGINS Program Science Plan and "source-to-sink" research because of its high tectonic activity,heavy rainfall and unique geography.Large suspended sediment loads are transported to the adjacent ocean by Taiwan Residents rivers every year,making Taiwan an important source of sediments into the adjacent seas and a natural laboratory for studying the systemic movement of fluvial sediments from source to sink.A detailed study on the clay mineral composition of surface sediments collected from the drainage basins of 12 Taiwan Residents rivers using X-ray diffraction methods was conducted.Our results indicated that the clay mineral assemblages consisted dominantly of illite(approximately 73%) and chlorite(approximately 24%),with lesser abundances of kaolinite(approximately 3%) and even lower levels of smectite from the Danshuei River sediments in northwestern Taiwan.The Jhuoshuei River sediments from western Taiwan contained clay mineral assemblages that consisted of illite(approximately 75%) and chlorite(approximately 25%),but they lacked kaolinite and smectite.In southwestern Taiwan,the clay mineral assemblages were dominated by illite(approximately 75%) and chlorite(approximately 23%),but had a low abundance of kaolinite(generally < 2%) and no smectite.The clay mineral assemblages in eastern Taiwan are obviously different from those in western parts of the island.The most noticeable difference is that the average abundance of chlorite in the Hualien River from eastern Taiwan was the highest(approximately 48%) of all the Taiwan Residents rivers.We concluded that,in general,the clay mineral assemblages in Taiwan Residents rivers were mainly composed of illite and chlorite with kaolinite and smectite being scarce,and these trends are different from those in China's mainland rivers.The clay mineral composition shown in this study was primarily

关键词：河流沉积物粘土矿物矿物组成台湾岛 X射线衍射方法矿物组合表层沉积物菲律宾海板块

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Records of the East Asian winter monsoon from the mud area on the inner shelf of the East China Sea since the mid-Holocene

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Chinese Science Bulletin 2010年第21期55卷 2306-2314页

作者： liu shengfa SHI XueFa liu YanGuang QIAO ShuQing YANG Gang FANG XiSheng WU YongHua LI ChaoXin LI XiaoYan ZHU AiMei GAO JingJing Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

AMS14C dating and analysis of grain size,major elements and clay minerals were applied to Core MZ01 from the mud area on the inner shelf of the East China Sea.Based on the environmentally sensitive grain size,clay mineral and major element assemblages,the history of the East Asia winter monsoon since the mid-Holocene could be reconstructed.These three proxies,mean grain size(>9.71μm),chemical index of alteration(CIA)and ratio of smectite to kaolinite in particular,show similar fluctuation patterns. Furthermore,10 extreme values corresponding to the contemporary cooling events could be recognized since the mid-Holocene;these extreme values are likely to have been caused by the strengthening of the East Asia winter monsoon.The cooling events correlated well with the results of theδ18O curves of the Dunde ice core and GISP2,which therefore revealed a regional response to global climate change.Four stages of the East Asia winter monsoon were identified,i.e.8300-6300 a BP,strong and unstable;6300-3800 a BP,strong but stable;3800-1400 a BP,weak and unstable;after 1400 a BP,weak but stable.

关键词：东亚冬季风中全新世 Sea 内陆架中期中国亚洲面积

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基于YOLOv3的自动驾驶多目标检测方法

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汽车实用技术 2024年第13期49卷 34-37,42页

作者：许丹毛生发陈喆刘英陕西重型汽车有限公司陕西西安710200

文章通过对YOLOv3算法目标检测原理进行深入分析,使用自采数据集道路场景中常见的行人、车辆和红绿灯等数据对算法模型进行训练,通过改变模型输入、过滤无意义目标物,以及调整学习策略,利用较小的训练集和较少的训练轮次获得实时性强、... 详细信息

文章通过对YOLOv3算法目标检测原理进行深入分析,使用自采数据集道路场景中常见的行人、车辆和红绿灯等数据对算法模型进行训练,通过改变模型输入、过滤无意义目标物,以及调整学习策略,利用较小的训练集和较少的训练轮次获得实时性强、精度较高的目标检测模型。实验表明,改进方法在测试集上平均精度达到71.58%,比传统YOLOv3算法提高1.94%,并且算法检测速度达到70.04 f/s,较优于传统YOLO系列算法。同时将该方法应用于车辆行驶动态数据集,能够实现针对视频中道路目标的实时检测。

关键词：目标检测深度学习 YOLOv3

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多元化教学在超声引导下经皮肝穿刺活检教学中的应用

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微创医学 2024年第2期19卷 196-198页

作者：赵盛发林宁静刘军杰广西医科大学附属肿瘤医院超声科广西南宁市530021

目前采用传统教学模式进行超声引导下经皮肝穿刺活检教学存在诸多问题,如何更好地提高介入超声的教学质量成为亟待解决的问题。采用多元化教学模式从理论教学、模拟仿真教学、临床实际操作、医学人文素质及师资培训方面加以改进,可以有... 详细信息

目前采用传统教学模式进行超声引导下经皮肝穿刺活检教学存在诸多问题,如何更好地提高介入超声的教学质量成为亟待解决的问题。采用多元化教学模式从理论教学、模拟仿真教学、临床实际操作、医学人文素质及师资培训方面加以改进,可以有效地激发学生的学习热情,有利于培养高素质的介入超声医生,为今后的介入超声教学提供参考。

关键词：多元化教学经皮肝穿刺活检超声

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Influence of Cerium on Corrosion of AZ91 Magnesium Alloy

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Journal of Rare Earths 2006年第2期24卷 247-247页

作者： liu shengfa liu Linyan Huang Shangyu Xu Ping Wang Zhongfan School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Automotive Engineering Wuhan University of Technology Wuhan 430070 China

Effect of cerium addition on corrosion resistance of AZ91 magnesium alloy was investigated using the static weight loss and polarization curve method as well as metallographical observation. The results indicate that a small amount of cerium （0.2% - 0.8%） in AZ91 magnesium alloy can significantly reduce the corrosion rate, enhance the electrode voltage and lower corrosion current density in 3.5%NaCl aqueous solution, and AZ91-0.8% Ce alloy has better corrosion resistant performance. The reason for increasing corrosion resistance is attributed to the addition of Ce, refining the α-Mg grain, reducing the segregation of element Al, and improving the morphologies of β-Mg17 Al12 phases.

关键词： AZ91 magnesium alloy cerium corrosion rare earths

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